CN105903898B - Shell mould sintering method and device - Google Patents
Shell mould sintering method and device Download PDFInfo
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- CN105903898B CN105903898B CN201610411520.0A CN201610411520A CN105903898B CN 105903898 B CN105903898 B CN 105903898B CN 201610411520 A CN201610411520 A CN 201610411520A CN 105903898 B CN105903898 B CN 105903898B
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- shell mould
- sintering
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/165—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents in the manufacture of multilayered shell moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/0016—Chamber type furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
- F27B5/16—Arrangements of air or gas supply devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a kind of shell mould sintering method and device, this method to include：S1. shell mould is made, needs to add carbon dust in the manufacturing process of shell mould；S2. it is put into after obtained shell mould is dewaxed in sintering equipment, ensures there is the oxygen content of abundance in sintering furnace, and maintain to sinter in-furnace temperature at 600 DEG C~800 DEG C, until the wax completely burnout of the residual in shell mould；S3. oxygen content in sintering furnace is reduced, and is warming up to the sintering temperature of shell mould；S4. the sintering temperature that sintering in-furnace temperature is shell mould is maintained in hypoxemia or oxygen-free environment, until shell mould sintering finishes.The device includes：Shell mould placement platform, heater, air-blast device, air draft flue, control system, sintering inner chamber and closing door；Wherein control system realizes the sintering operation of shell mould based on shell mould sintering method of the present invention control heater, air-blast device, air draft flue.The stability of quality can be improved using the sintering method and device of the present invention, improve production efficiency.
Description
Technical field
The present invention relates to precision casting process, more particularly to a kind of shell mould sintering method and the special device of this method.
Background technology
Hot investment casting is a kind of casting method for conventional casting techniques, and it can obtain relatively accurate shape
Shape and higher casting accuracy.The technical process of hot investment casting is：First, wax-pattern, the wax-pattern and the product of required casting are made
Size shape is consistent；Then, pottery shell is formed in made wax pattern surface；Then, carrying out dewaxing treatment to the pottery shell (will
Removed after its internal wax-pattern fusing)；Afterwards, pottery shell is sintered at high temperature；Finally, the casting metal material into the pottery shell after sintering
Material, after metal material cooled and solidified, crush and remove the pottery shell, obtained casting is required product.
In above-mentioned technical process, the making for shell of making pottery is most important, and its quality determines the quality of casting.Mesh
Before, the method that pottery shell makes generally use is：Shell moulding, specifically made frequently with aqueous silica sol shell process, this method
To prepare different slurry and sand using refractory material when making pottery shell, one layer of slurry, one layer of sand gradually from level to level be accumulated in wax-pattern
Surface, the pottery shell of thickness required for being made.Then, by obtained pottery shell it is dry, dewax and be put into sintering machine in 900~1400
High temperature sintering at DEG C.Because sintering is that shell molding makees an essential step link, therefore, the quality of sintering directly influences shell
Mould quality, and the quality of final casting.
Prior art generally use flatbed sintering furnace or tunnel type sintering furnace carry out the sintering work of shell mould, sintering process
In be directly warming up to shell mould sintering temperature and be sintered operation.Both differences are：Flatbed sintering furnace, according to whether being equipped with
Air chimney is divided into closed platforms type sintering furnace as Figure 1-1 again, and its sintering process is：First by the shell mould after dewaxing
In on the platform of sintering furnace chamber 1, being then shut off closing door 3, control system 4 controls heater 2 to the downward back-off of sprue cup simultaneously
Heating is carried out to sintering furnace chamber 1 until the temperature of sintering furnace chamber 1 reaches shell mould sintering temperature, the control heating of control system 4
Device maintains the temperature of sintering furnace chamber 1, and operation is sintered to shell mould, and whole process sintering furnace chamber 1 is approximately at closed state；
And convection type flatbed sintering furnace as shown in Figure 1-2, its sintering process are：It is first that the shell mould sprue cup after dewaxing is downward
In on the platform of sintering furnace chamber 1, being then shut off closing door 4, control system 5 controls heater 2 in sintering furnace to back-off simultaneously
Chamber 1 carries out heating until the temperature of sintering furnace chamber 1 reaches shell mould sintering temperature, and control system 5 controls heater to maintain to burn
The temperature of freezing of a furnace inner chamber 1, operation is sintered to shell mould, because sintering furnace chamber 1 is connected with unlimited convection pass 3, therefore
Sintering process whole process is in thermal convection current state.
Existing tunnel type sintering furnace, as shown in Fig. 2 its sintering process is：Shell mould after dewaxing, the downward back-off of its sprue cup
In on a flat bogie 3, flat bogie 3 is pushed into sintering furnace chamber 1, closing closing door 4, control system 5 starts heating simultaneously
Device 2 carries out heating to sintering furnace chamber 1 until the temperature of sintering furnace chamber 1 reaches shell mould sintering temperature, and control system 5 controls
Heater maintains the temperature of sintering furnace chamber 1, and operation is sintered to shell mould, is led because the lower section of sintering furnace chamber 1 is equipped with
Rail, therefore can not completely enclose, because causing sintering process is whole to be in thermal convection current state.
The purpose of sprue cup back-off is needed during existing sintering furnace sinterskin mould caused in shell mould sintering process is prevented
Grog is fallen in shell mould, influences casting quality made from final cast.
Problems be present using existing sintering method and device：
1. shell mould is made using flatbed sintering furnace sintering, husky hole would generally be carried after pour steel on obtained casting.
Often exist 2. using shell mould made from closed platforms type sintering furnace sintering, during casting pouring molten steel molten steel to
The phenomenon of outer splash so that the danger coefficient of casting process increases；In addition, often because there is penetrating property gas in obtained casting
Hole and scrap.
3. using convection type flatbed sintering furnace and tunnel type sintering furnace, decarburization phenomenon often occurs when casting is stripped
And occurs surface corrosion phenomenon on casting.
4. as carried out continuous production using flatbed sintering furnace, then using the 2nd stove and the shell mould pour steel sintered afterwards
Obtained casting, it will usually grey side be present --- i.e. flash or convex water wave, or there is the chicken feet line of scrobicula round bottom --- i.e. recessed water
Line.
Above mentioned problem, it can cause casting quality unstable, so as to cause high, the existing solution of casting substandard products, percent defective
Method is typically that substandard products further finish to reach the casting accuracy of needs, and cycling and reutilization is carried out to waste product.
Although existing solve the problems, such as that method compensate for casting quality to a certain degree, existing solution method seriously reduces life
Production efficiency, improve production cost and be difficult to the sufficiently high casting of production department's precision.
The content of the invention
To solve the above problems, an object of the present invention is the provision of a kind of shell mould sintering method, this method includes
Following steps：
S1. shell mould is made, needs to add carbon dust in the manufacturing process of shell mould；
S2. it is put into after obtained shell mould is dewaxed in sintering equipment, ensures there is the oxygen content of abundance in sintering furnace, be warming up to
The ignition temperature of shell mould wax, and maintain to sinter in-furnace temperature until the wax completely burnout of the residual in shell mould；
S3. oxygen content in sintering furnace is reduced, and is warming up to the sintering temperature of shell mould；
S4. the sintering temperature that sintering in-furnace temperature is shell mould is maintained in hypoxemia or oxygen-free environment, until shell mould has sintered
Finish.
Further, shell molding described in step S1 needs to add carbon dust during making, and is specially：
A. such as shell mould is 4 layers or 5 layers of shell mode structure, then adds carbon dust at the 3rd layer of shell mould from-inner-to-outer；
B. such as shell mould is 6 layers or 7 layers of shell mode structure, then adds carbon dust at the 3rd and the 4th layer of shell mould from-inner-to-outer；
C. such as shell mould then adds carbon dust for 7 layers with upper casing mode structure at the 3rd, the 4th and the 5th layer of shell mould from-inner-to-outer.
Further, the total amount of adding of carbon dust is more than the 15% of shell mould quality.
Preferably, the addition of each layer carbon dust successively increases from internal layer adding layers.
Preferably, the total amount of adding of carbon dust is the 15%~20% of shell mould quality.
Preferably, the carbon dust is graphite.
Further, in step S2, there can be foot by manufacturing sinuous flow air-flow within the border in sintered ring to ensure to sinter environment
Enough oxygen contents.
Further, the ignition temperature of shell mould wax can position 600 DEG C~800 DEG C described in step S2.
Further, the shape and complexity held time according to shell mould of sintering in-furnace temperature are maintained described in step S2
Preset.
Preferably, described hold time can be set as 5~20min.
Further, sintering in-furnace temperature holding time according to shell mould for the sintering temperature of shell mould is maintained described in step S4
Shape and complexity preset.
Preferably, described hold time can be set as 30~180min.
Further, the sintering temperature of shell mould described in step S4 is preset according to the shape and complexity of shell mould.
Preferably, the sintering temperature of the shell mould can be set as 1200~1400 DEG C.
It is a further object of the invention to provide a kind of sintering equipment based on above-mentioned shell mould sintering method, the device
Including shell mould placement platform, heater, air-blast device, air draft flue, control system, sintering inner chamber and closing door；Wherein, treat
Sinterskin mould sprue cup back-off is positioned on shell mould placement platform；Loaded on intracavitary in sintering in shell mould placement platform；Closing door can
To be turned on and off sintering inner chamber；Heater can carry out heating operation to sintering inner chamber；Air-blast device air inlet one end position
In outside sintering equipment, air outlet one end is located at intracavitary in sintering；Air draft flue is located at built with switching device, its air inlet one end
Intracavitary in sintering, air outlet one end are located at outside sintering equipment；Control system includes temperature sense module and control module, its medium temperature
Degree induction module is installed on intracavitary in sintering, can be with the environment temperature of intracavitary in induction sintering and to control module feedback temperature number
According to control module is connected with the switching device in heater, air-blast device and air draft flue respectively, can be according to default program
Control being turned on and off for heater, air-blast device and air draft flue；
The course of work of the sintering equipment is：
A. after shell mould to be sintered being put on shell mould placement platform, starter, control device control heater, air blast
Device and air draft flue are opened；
B. when inner chamber temperature to be sintered reaches first stage design temperature, being turned on and off for heater is controlled, with dimension
Sintering inner chamber temperature is held in the first stage in the range of design temperature, holds time and is set in advance according to the shape and complexity of shell mould
It is fixed；
C. air-blast device and air draft flue are closed, while opens heater, continues heating until second stage setting temperature
Degree；
D. being turned on and off for heater is controlled, to maintain sintering inner chamber temperature in second stage design temperature scope
It is interior, hold time and preset according to the shape and complexity of shell mould.
Preferably, the first stage design temperature can be 600 DEG C~800 DEG C.
The first stage design temperature scope is pattern wax ignition temperature to carbon dust ignition temperature.
Preferably, the temperature range of the first stage setting can be 600 DEG C~800 DEG C.
Preferably, the second stage design temperature can be 1200 DEG C~1400 DEG C.
The second stage design temperature is shell mould sintering temperature, and the temperature range of second stage setting can be that shell mould burns
Junction temperature ± 100 DEG C.
Preferably, the temperature range of the second stage setting can be 1200 DEG C~1400 DEG C.
Further, the shell mould placement platform can be fixedly installed in sintering in intracavitary or with sinter inner chamber active link.
Further, the air-blast device and air draft flue can make the wind-force of intracavitary formation sinuous flow air-flow and sinuous flow in sintering
Intensity is not enough to grog being blown into shell mould.
Further, the device B that opens the light is also equipped with the blast channel of air-blast device, the device can be turned on and off air blast
Passage.
Preferably, the switching device B in the air-blast device is installed on air-blast device going out in sintering inner chamber cavity wall
On the outside of air port.
Preferably, the switching device in the air draft flue is installed on air intake of the air draft flue in sintering inner chamber cavity wall
On the outside of mouthful.
Further, the control system also includes oxygen concentration monitoring modular, and one end of the module is connected into sintering inner chamber, can
Real-time oxygen concentration in inner chamber is sintered with monitoring；The other end is connected with control module, the real-time oxygen concentration that will can be sintered in inner chamber
Feed back to control module；Control module controls the power output of air-blast device according to the oxygen concentration of acquisition.
Further, the shell mould placement platform is placed on the end face of shell mould with fluted, and recess width can allow shell
Grog caused by mould sintering falls into groove and will not cause shell mould tilt phenomenon can occur in shell mould itself landing to groove.
Further, the sinuous flow air-flow that intracavitary is formed in sintering by air-blast device and air draft flue can be along recessed
Groove enters inside shell mould from the sprue cup of shell mould.
Preferably, as shell mould only has a sprue cup, then sinuous flow air-flow can be internally formed convection current in shell mould；As shell mould have it is more
Individual sprue cup, then sinuous flow air-flow can be internally formed circulation in shell mould.
Preferably, detachable or replacement a flat board is placed or is provided with shell mould placement platform, and shell mould is positioned over flat board
On end face, flat board is placed on the end face of shell mould with fluted, recess width can allow shell mould sinter caused by grog fall into
In groove and it will not cause shell mould tilt phenomenon can occur in shell mould itself landing to groove.
Preferably, the flat board is combined flat plate, and flat board overall is formed by polylith minor structure flat sheet combination.
Further, the groove is obtained by wavy end face, and now, the sprue cup wall of cup back-off of shell mould to be sintered is put
It is placed in the crest location of wavy end face.
Preferably, 3~10cm of its crest height of wave of the wave structure of wavy end face.
Further, shaking device and cleaning door are also equipped with the air draft flue, the shaking device can be by air draft cigarette
The flue dust adhered on road inwall is shaken off to the cleaning door of flue.
Preferably, the shaking device includes：Vibration motor, drive device and control device.Wherein, vibration motor activity
It is installed on exhaust uptake lateral wall；Control device is connected with vibration motor, can control being turned on and off for vibration motor, together
When can by drive device control vibration motor be moved along the lateral wall of exhaust uptake.
Preferably, the drive device includes motor and tracks, and control device is connected with motor, can be with
Vibration motor is controlled to be moved along the tracks on exhaust uptake lateral wall by motor according to pre-set programs.
Shell mould sintering method and device of the present invention have advantages below：
1. carry out pouring molten steel with shell mould sintering method of the present invention and the made shell mould of device, molten steel there's almost no
The phenomenon of outside splash, obtained casting also there's almost no penetrating property stomata.
2. carry out pouring molten steel with shell mould sintering method of the present invention and the made shell mould of device, mould is hardly produced
Wall reacts, and improves the precision of casting.
3. shell mould sintering method of the present invention and device can carry out the continuous production of shell mould, and hardly exist
Continuous flow procedure medium casting produces the problem of convex water wave or recessed water wave.
4. the casting made from shell mould sintering method of the present invention and the made shell mould cast of device, there's almost no sand
Hole.
5. the casting quality made from shell mould sintering method of the present invention and the made shell mould cast of device is stable, substandard products,
Defective goods rate is low and production efficiency is far above existing sintering method and device.
6. appropriate carbon dust addition can not only ensure to have have enough carbon dusts to carry out anti-Oxygen permeation in pour steel
Protection, and can guarantee that shell mould will not cause the intensity deficiency of shell mould due to a large amount of burnings of carbon dust；Suitable carbon dust addition position
Put and not only ensure that shell mould carries out fluffy processing in the shell of needs, and ensure that shell mould has enough intensity.
Brief description of the drawings
Fig. 1-1 is existing closed platforms type sintering furnace；
Fig. 1-2 is existing convection type flatbed sintering furnace；
Fig. 2 is existing tunnel type sintering furnace；
Fig. 3 is sintering equipment structural representation of the present invention；
Fig. 4 is the sintering inner-cavity structure figure of sintering equipment of the present invention；
Fig. 5 is that combined type waveform of the present invention sinters slab construction schematic diagram.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing, the present invention is entered
One step describes in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this
Invention.
Inventor has found that existing sintering method and sintering equipment can produce above mentioned problem by the research to prior art
Reason is respectively：
1. outwards sprayed using molten steel can be produced during shell mould pour steel made from existing closed platforms type sintering furnace sintering
Occurring the reason for penetrating property stomata in the phenomenon and casting splashed is：Existing sintering method is heat-agglomerating stove to shell mould
Sintering temperature is simultaneously kept for a period of time until shell mould sintering is completed, and the temperature of the sintering of shell mould is usually 1200~1400 DEG C；So
Totally (heating shell mould, treats that wax is molten for the wax removing completely that rear shell mould is used when being tended not to before being put into sintering furnace and will make shell mould
Wax is poured out after change), when particularly shell mould is larger or constructs complicated, now, the wax not removed completely is under high-temperature low-oxygen environment
By direct carbonization, so as to be attached in the form of carbon residue inside shell mould.When toward during pour steel in shell mould, carbon residue in shell mould because
Rapidly combustion reaction forms CO gases at high pressure for the high temperature of molten steel and Mo Nei air, will not be reacted between CO and molten steel, by
It is close and high-strength in the internal layer matter of shell mould and steel contacts, therefore CO gases at high pressure inversely outer can only be arranged, and from causing molten steel outside
Splash, the CO gases of residual can also form penetrating property stomata on casting.
2. often it is stripped using shell mould made from convection type flatbed sintering furnace and tunnel type sintering furnace sintering in casting
Shi Fasheng decarburization phenomenons and it is occurring the reason for surface corrosion phenomenon on casting：In order to prevent in the manufacturing process of shell mould
Die wall reacts and improved the gas permeability of shell mould, generally can all add carbon dust；But due to convection type flatbed sintering furnace and tunnel
Its sintering environment of channel type sintering furnace is semiclosed environment, and oxygen content is very high, therefore the carbon dust added can be complete by oxidation reaction quickly,
So that obtained shell mould can not play due protective effect.When pour steel, the oxygen in external environment condition largely penetrates into
Shell mould internal layer；When the internal layer surface that Oxygen permeation to molten steel contacts with shell mould, under the high temperature action of molten steel, the metal in molten steel
Oxide reacts to form the silicate of low melting point with the silica in shell mould internal layer, that is, die wall reaction occurs, so that
Decarburization phenomenon occurs when casting is stripped and occurs surface corrosion phenomenon on casting.Shell mould is made using the Ludox of high concentration
Die wall reaction can further be aggravated.
3. carrying out continuous production using existing sintering furnace, then it is made using the 2nd stove and the shell mould pour steel sintered afterwards
Casting there is the reason for flash/convex water wave or recessed water wave and be：In continuous sintering the second furnace shell mould and later shell mould, by
It is high in in-furnace temperature, and the capacity of heat transmission of shell mould is poor, therefore shell mould internal-external temperature difference can be caused big, and then shell mould occurs
Expansion is more than inner casing mould so that hair check occurs on inner casing mould.If caused hair check is insufficient to allow molten steel to pass through, checking
The gas overstock at line expands generation instantaneous pressure at high temperature, so that recessed water wave occurs in cast(ing) surface.It is if caused
Hair check can pass through molten steel, then molten steel passes through crackle so that occur yearning for prominent flash or convex water wave on casting.
4. shell mould is made using flatbed sintering furnace sintering, husky hole would generally be carried after pour steel on obtained casting
Reason is：The sintering process of shell mould will necessarily be along with the generation of grog --- i.e. shell mould outer layer make pottery body in sintering process not
It can maintain have structural strength and drop, the grog to drop is accumulated on platform, now, prevents due to back-off sprue cup
Grog in sintering process drops, but the residual grog being attached on sprue cup can slide into shell mould in pour steel
Portion, the grog of landing form high temperature resistant type structure next time in the high temperature action of molten steel, sand-like recessed so as to cause cast(ing) surface to occur
Hole, these potholes are referred to as husky hole.Now also there is technology to place husky hole, i.e., by the way of timely cleaning residual grog, but it is existing
With the presence of technology：(1) must stop producing as carried out grog cleaning, reducing sintering in-furnace temperature can just be carried out；(2) grog drops
Often condensed during temperature, so as to be difficult to clean off, remove the sintering platform that can even damage sintering machine by force.It is existing clear
Reason technology greatly reduces production efficiency, while improves production cost.
Found based on the studies above, inventor provide a kind of new shell mould sintering method, this method comprises the following steps：
S1. shell mould is made, needs to add graphite in the manufacturing process of shell mould.
The addition of graphite is the 20% of shell mould quality；The point of addition of graphite is specially：
A. such as shell mould is 4 layers or 5 layers of shell mode structure, then adds carbon dust at the 3rd layer of shell mould from-inner-to-outer.
B. such as shell mould is 6 layers or 7 layers of shell mode structure, then adds carbon dust at the 3rd and the 4th layer of shell mould from-inner-to-outer.
C. such as shell mould then adds carbon dust for 7 layers with upper casing mode structure at the 3rd, the 4th and the 5th layer of shell mould from-inner-to-outer.
The addition of each layer carbon dust successively increases from internal layer adding layers.
According to one embodiment of present invention, the addition of graphite is the 15% of shell mould quality.
S2. it is put into after obtained shell mould is dewaxed in sintering equipment, ensures there is the oxygen content of abundance in sintering furnace, and maintain
In-furnace temperature is sintered at 600 DEG C~800 DEG C, until the wax completely burnout of the residual in shell mould.
According to one embodiment of present invention, step S2 hold time according to the shape of shell mould and complexity 5~
Preset in 20min.
S3. oxygen content in sintering furnace is reduced, and is warming up to the sintering temperature of shell mould.
S4. the sintering temperature that sintering in-furnace temperature is shell mould is maintained in hypoxemia or oxygen-free environment, until shell mould has sintered
Finish.
According to one embodiment of present invention, dimension of the sintering in-furnace temperature for the sintering temperature of shell mould is maintained described in step S4
Hold the time presets according to the shape and complexity of shell mould in 30~180min.
According to one embodiment of present invention, shape and complicated journey of the sintering temperature of shell mould described in step S4 according to shell mould
Degree is preset at 1200 DEG C~1400 DEG C.
Based on above-mentioned sintering method, present invention also offers a kind of shell mould sintering equipment, as shown in figure 3, the device includes
Including shell mould placement platform 1, heater 2, air-blast device 3, air draft flue 4, control system 5, sintering inner chamber 6 and closing door 7.
Wherein：
Loaded in sintering inner chamber 6 in shell mould placement platform 1, shell mould sprue cup back-off to be sintered is positioned over shell mould placement platform
On 1, one side that shell mould placement platform 1 contacts with shell mould sprue cup is wavy shaped configuration, crest height 10cm, now, cast gate
Cup and is vacantly positioned on crest back-off.
According to one embodiment of present invention, the crest height of shell mould placement platform 1 can be 3cm.
According to one embodiment of present invention, the crest height of shell mould placement platform 1 can be 5cm.
According to one embodiment of present invention, shell mould placement platform 1 can be used and is loaded in dismountable movable connection structure
Sinter in inner chamber 6.
According to one embodiment of present invention, the wavy shaped configuration on shell mould placement platform 1 can be changed to other with recessed
The structure of groove.
According to one embodiment of present invention, as shown in figure 5, shell mould placement platform 1 is flat bed platform, shell mould placement platform
1 is placed with the sintered plate 11 combined by polylith daughter board 12.Shell mould back-off is on sintered plate 11.Sintered plate 11 contacts with shell mould
One side be wavy shaped configuration face, crest height 10cm, now, the sprue cup back-off of shell mould and be vacantly positioned over sintered plate 11
On crest.
According to one embodiment of present invention, the crest height of sintered plate can be 3cm.
According to one embodiment of present invention, the crest height of sintered plate can be 5cm.
According to one embodiment of present invention, the wavy shaped configuration on sintered plate can be changed to other with reeded knot
Structure.
Closing door 7 can be turned on and off sintering inner chamber 6.Heater 2 can carry out heating operation to sintering inner chamber 6.
The air inlet one end of air-blast device 3 is located at outside sintering equipment, and air outlet one end is in sintering inner chamber 6.Blast channel
The device 31 that opens the light inside is also equipped with, the device can be turned on and off blast channel.Switching device 31 in the air-blast device is pacified
Loaded on air-blast device on the outside of the air outlet in the sintering cavity wall of inner chamber 6.
Air draft flue 4 is built with switching device 41, and its air inlet one end intracavitary in sintering, air outlet one end is positioned at burning
Tie outside device.Switching device in the air draft flue is installed on air draft flue outside the air inlet in the sintering cavity wall of inner chamber 6
Side.It is also equipped with shaking device 42 and cleaning door 43 on the air draft flue, the shaking device can will be attached in air draft flue inner wall
The flue dust is shaken off to the cleaning door of flue.The shaking device 42 includes：Vibration motor, drive device and control device.Its
In, vibration motor is movably installed on exhaust uptake lateral wall；Drive device includes motor and tracks, control device
It is connected with vibration motor and motor, being turned on and off for vibration motor can be controlled according to pre-set programs, while can pass through
Motor control vibration motor moves along the tracks on exhaust uptake lateral wall.The flue dust shaken off can pass through cleaning door 43
Take out.
As shown in figure 4, under the collective effect of air-blast device 3 and air draft flue 4, sintering forms sinuous flow air-flow in inner chamber 6.
The sinuous flow air-flow can enter inside shell mould along the sprue cup opening position that shell mould is vacantly placed.As shell mould only has a cast gate
Cup, then sinuous flow air-flow can be internally formed convection current in shell mould；As shell mould has multiple sprue cups, then sinuous flow air-flow can inside shell mould shape
Into circulation.Meanwhile the wind intensity that air-blast device 3 blasts is not enough to grog being blown into shell mould.
Control system 5 includes temperature sense module 51 and control module 52, and wherein temperature sense module 51 is installed on sintering
In inner chamber 6, it can divide with the environment temperature in induction sintering inner chamber 6 and to the feedback temperature data of control module 52, control module 52
Not with opening in the switching device 31 in heater 2, air-blast device 3 and air draft flue 4 and air-blast device 3, air draft flue 4
Device 41 is closed to connect, can be according to default program controlled heater device, air-blast device, air draft flue and switching device 31 and 41
Be turned on and off.
According to one embodiment of present invention, the control system 5 also includes oxygen concentration monitoring modular, one end of the module
Sintering inner chamber 6 is connected into, the real-time oxygen concentration in sintering inner chamber 6 can be monitored；The other end is connected with control module 52, will can be sintered
Real-time oxygen concentration in inner chamber 6 feeds back to control module 52；Control module 52 controls air-blast device 3 according to the oxygen concentration of acquisition
Power output.
The course of work of shell mould sintering equipment of the present invention is：
A. after shell mould to be sintered being placed on the sintered plate on shell mould placement platform 1, starter, control device 5 is controlled
The switching device 41 in switching device 31 and air draft flue 4 in refrigerating/heating apparatus 2, air-blast device 3 and air-blast device 3 is opened
Open.
B. when the temperature of inner chamber 6 to be sintered reaches 700 DEG C of temperature, being turned on and off for heater is controlled, to maintain to sinter
Inner chamber temperature is held time in 600 DEG C~800 DEG C temperature ranges and is redefined for 5 according to the shape and complexity of shell mould
~20min；
C. the switching device 41 closed in switching device 31 and air draft flue 4 in air-blast device 3 and air-blast device 3.
Heater 2 is opened simultaneously, continues heat-agglomerating inner chamber 6 until the sintering temperature of inner chamber 6 reaches the sintering temperature of shell mould.Shell mould
Sintering temperature can be selected according to the shape and complexity of shell mould in 1200 DEG C~1400 DEG C.
D. being turned on and off for heater is controlled, to maintain sintering inner chamber temperature in 1200 DEG C~1400 DEG C temperature ranges
It is interior, hold time and 30~180min is redefined for according to the shape and complexity of shell mould.
The advantages of sintering method and device of the present invention, is：
1. using Segmented heating method, shell mould sintering process burning wax stage and sintering stage are divided into, has burnt the cured stage
Oxygen and the wax that ensure that sintered ring has abundance within the border carry out abundant combustion reaction so that there's almost no in obtained shell mould because
Residual wax is carbonized the carbon residue to be formed, avoid therefore caused by molten steel expulsion problem when pouring into a mould and casting have asking for penetrating property stomata
Topic.Meanwhile the domestic oxygen concentration of sintered ring is reduced as far as possible in sintering stage, the graphite in shell mould is avoided in sintering stage
It is complete with regard to completely burned, cause serious die wall reacting phenomenon occurs during shell mould pour steel.
2. the one side that sintering equipment contacts with shell mould sprue cup is waveform, the configuration because sprue cup contacts with crest,
Contact surface is almost tangent plane, therefore sprue cup is turned when carrying out pouring molten steel, and its sprue gate hardly remains
Grog, also avoid therefore caused husky hole phenomenon.
3. under air-blast device and air draft flue collective effect, intracavitary can form sinuous flow air-flow in sintering.The sinuous flow gas
Stream can enter inside shell mould along the sprue cup opening position that shell mould is vacantly placed, and reduce the temperature difference between shell mould ectonexine, keep away
Exempt from due to shell mould internal layer shattered crack caused by shell mould internal-external temperature difference, and then caused casting grey side/convex water wave or recessed water wave occur
Problem.Meanwhile the wind intensity of sinuous flow air-flow is relatively low, it is not enough to grog being blown into shell mould.
4. using placement platform of the combined type sintered plate as shell mould, more pottery can have been saved bit by bit in the groove of sintered plate
Sintered plate is changed during slag in time, not only the residual grog in easy cleaning sintered plate, and it is smaller on quantity-produced influence, carry
High production efficiency.
5. appropriate carbon dust addition can not only ensure to have have enough carbon dusts to carry out anti-Oxygen permeation in pour steel
Protection, and can guarantee that shell mould will not cause the intensity deficiency of shell mould due to a large amount of burnings of carbon dust；Suitable carbon dust addition position
Put and not only ensure that shell mould carries out fluffy processing in the shell of needs, and ensure that shell mould has enough intensity.
Not only reduced using sintering method of the present invention and device because casting quality caused by existing shell casting process
It is unstable, casting substandard products, the problem of percent defective is high, production efficiency is improved, reduces production cost and essence can be produced
Spend sufficiently high casting.
It should be noted that and understand, in the case of the spirit and scope required by not departing from the claims in the present invention, energy
Enough present invention to foregoing detailed description make various modifications and improvements.It is therefore desirable to protection technical scheme scope not by
The limitation of given any specific exemplary teachings.
Claims (9)
- A kind of 1. shell mould sintering method, it is characterised in that：Comprise the following steps：S1. shell mould is made, needs to add carbon dust in the manufacturing process of shell mould；Shell molding described in step S1 needs to add carbon dust during making, and is specially：A. such as shell mould is 4 layers or 5 layers of shell mode structure, then adds carbon dust at the 3rd layer of shell mould from-inner-to-outer；B. such as shell mould is 6 layers or 7 layers of shell mode structure, then adds carbon dust at the 3rd and the 4th layer of shell mould from-inner-to-outer；C. such as shell mould then adds carbon dust for 7 layers with upper casing mode structure at the 3rd, the 4th and the 5th layer of shell mould from-inner-to-outer；S2. it is put into after obtained shell mould is dewaxed in sintering equipment, ensures there is the oxygen content of abundance in sintering furnace, be warming up to shell mould With the ignition temperature of wax, and maintain to sinter in-furnace temperature until the wax completely burnout of the residual in shell mould；S3. oxygen content in sintering furnace is reduced, and is warming up to the sintering temperature of shell mould；S4. the sintering temperature that sintering in-furnace temperature is shell mould is maintained in hypoxemia or oxygen-free environment, until shell mould sintering finishes.
- 2. shell mould sintering method according to claim 1, it is characterised in that：The total amount of adding of the carbon dust is shell mould quality More than 15%.
- 3. according to a kind of shell mould sintering equipment of any shell mould sintering method of claim 1~2, it is characterised in that：Including Shell mould placement platform, heater, air-blast device, air draft flue, control system, sintering inner chamber and closing door；Wherein, it is to be sintered Shell mould sprue cup back-off is positioned on shell mould placement platform；Loaded on intracavitary in sintering in shell mould placement platform；Closing door can be opened Open or close sintering inner chamber；Heater can carry out heating operation to sintering inner chamber；Air-blast device air inlet one end is positioned at burning Tie outside device, air outlet one end intracavitary in sintering；Air draft flue is built with switching device, and its air inlet one end is positioned at sintering Interior intracavitary, air outlet one end are located at outside sintering equipment；Control system includes temperature sense module and control module, wherein temperature sense Answer module to be installed on intracavitary in sintering, can with the environment temperature of intracavitary in induction sintering and to control module feedback temperature data, Control module is connected with the switching device in heater, air-blast device and air draft flue respectively, can be according to default program control Refrigerating/heating apparatus, air-blast device and air draft flue are turned on and off；The shell mould placement platform be fixedly installed in sintering in intracavitary or with sinter inner chamber active link；The air-blast device and air draft flue can make intracavitary in sintering form sinuous flow air-flow；The course of work of the sintering equipment is：A. after shell mould to be sintered being put on shell mould placement platform, starter, control device control heater, air-blast device Opened with air draft flue；B. when inner chamber temperature to be sintered reaches first stage design temperature, being turned on and off for heater is controlled, to maintain to burn Knot inner chamber temperature in the range of design temperature, is held time and preset according to the shape and complexity of shell mould in the first stage；C. air-blast device and air draft flue are closed, while opens heater, continues heating until second stage design temperature；D. being turned on and off for heater is controlled, to maintain sintering inner chamber temperature in the range of second stage design temperature, dimension Hold the time presets according to the shape and complexity of shell mould.
- 4. shell mould sintering equipment according to claim 3, it is characterised in that：The control system also includes oxygen concentration monitoring mould Block, one end of the module are connected into sintering inner chamber, can monitor the real-time oxygen concentration in sintering inner chamber；The other end connects with control module Connect, the real-time oxygen concentration sintered in inner chamber can be fed back to control module；Control module controls air blast according to the oxygen concentration of acquisition The power output of device.
- 5. shell mould sintering equipment according to claim 3, it is characterised in that：The shell mould placement platform places one end of shell mould With fluted on face, recess width can allow shell mould sinter caused by grog fall into groove and shell mould itself will not be caused to slide Shell mould tilt phenomenon can be occurred by dropping down onto in groove.
- 6. shell mould sintering equipment according to claim 3, it is characterised in that：Placing or be provided with one on shell mould placement platform can Dismounting or the flat board replaced, shell mould is positioned on flat board end face, and flat board is placed on the end face of shell mould with fluted, and groove is wide Degree can allow grog caused by shell mould sintering to fall into groove and will not cause shell can occur in shell mould itself landing to groove Mould tilt phenomenon.
- 7. shell mould sintering equipment according to claim 6, it is characterised in that：The flat board is combined flat plate, flat board overall Formed by polylith minor structure flat sheet combination.
- 8. according to any shell mould sintering equipment of claim 5~7, it is characterised in that：The groove passes through wavy end face Obtain, now, the sprue cup wall of cup of shell mould to be sintered is positioned over the crest location of wavy end face.
- 9. shell mould sintering equipment according to claim 3, it is characterised in that：Be also equipped with the air draft flue shaking device and Cleaning door, the shaking device can shake off the flue dust adhered in air draft flue inner wall to the cleaning door of air draft flue.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610411520.0A CN105903898B (en) | 2016-06-12 | 2016-06-12 | Shell mould sintering method and device |
| TW105127314A TWI622569B (en) | 2016-06-12 | 2016-08-25 | Shell mold sintering method and device |
| PCT/CN2016/097555 WO2017215127A1 (en) | 2016-06-12 | 2016-08-31 | Shell mold sintering method and apparatus |
| EP16905240.4A EP3357602B1 (en) | 2016-06-12 | 2016-08-31 | Shell mold sintering method and apparatus |
| KR1020187014669A KR102069459B1 (en) | 2016-06-12 | 2016-08-31 | Shell mold sintering method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610411520.0A CN105903898B (en) | 2016-06-12 | 2016-06-12 | Shell mould sintering method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105903898A CN105903898A (en) | 2016-08-31 |
| CN105903898B true CN105903898B (en) | 2017-12-05 |
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| CN201610411520.0A Active CN105903898B (en) | 2016-06-12 | 2016-06-12 | Shell mould sintering method and device |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3357602B1 (en) |
| KR (1) | KR102069459B1 (en) |
| CN (1) | CN105903898B (en) |
| TW (1) | TWI622569B (en) |
| WO (1) | WO2017215127A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734883B (en) * | 2017-01-03 | 2018-10-02 | 蔡耀名 | Shell mold sintering equipment and method |
| CN113953449B (en) * | 2021-09-30 | 2023-12-29 | 鹰普（中国）有限公司 | Shell manufacturing process capable of rapidly removing complex product cavity mould shell |
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- 2016-06-12 CN CN201610411520.0A patent/CN105903898B/en active Active
- 2016-08-25 TW TW105127314A patent/TWI622569B/en active
- 2016-08-31 EP EP16905240.4A patent/EP3357602B1/en active Active
- 2016-08-31 WO PCT/CN2016/097555 patent/WO2017215127A1/en active Application Filing
- 2016-08-31 KR KR1020187014669A patent/KR102069459B1/en active IP Right Grant
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3357602A1 (en) | 2018-08-08 |
| EP3357602A4 (en) | 2019-04-10 |
| WO2017215127A1 (en) | 2017-12-21 |
| CN105903898A (en) | 2016-08-31 |
| EP3357602B1 (en) | 2021-03-03 |
| KR102069459B1 (en) | 2020-01-22 |
| TW201742852A (en) | 2017-12-16 |
| KR20180074757A (en) | 2018-07-03 |
| TWI622569B (en) | 2018-05-01 |
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