CN116944427A - Bottom pouring type pouring system and pouring method for casting of large nodular cast iron wind power main frame - Google Patents
Bottom pouring type pouring system and pouring method for casting of large nodular cast iron wind power main frame Download PDFInfo
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- CN116944427A CN116944427A CN202310954505.0A CN202310954505A CN116944427A CN 116944427 A CN116944427 A CN 116944427A CN 202310954505 A CN202310954505 A CN 202310954505A CN 116944427 A CN116944427 A CN 116944427A
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- 238000005266 casting Methods 0.000 title claims abstract description 100
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 61
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 238000007711 solidification Methods 0.000 claims abstract description 11
- 230000008023 solidification Effects 0.000 claims abstract description 11
- 230000000903 blocking effect Effects 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 54
- 229910052751 metal Inorganic materials 0.000 claims description 54
- 238000001914 filtration Methods 0.000 claims description 26
- 230000007246 mechanism Effects 0.000 claims description 16
- 238000004321 preservation Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000003491 array Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000003031 feeding effect Effects 0.000 abstract description 2
- 238000007528 sand casting Methods 0.000 abstract description 2
- 230000008092 positive effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/086—Filters
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a bottom pouring type pouring system and a pouring method for castings of a large-scale wind power main frame of spheroidal graphite cast iron, which belong to spheroidal graphite cast iron sand casting technology, the existing filter residue means are mainly that filter residue pieces are placed in a sprue or an inner runner, or a slag blocking channel is arranged, or the slag collecting amount is limited, the impurities generated in the sprue cannot be blocked, even the castings are insufficient, or the filter residue rate is low, the slag cannot be blocked completely, and the performance of the castings is reduced; the two groups of symmetrical pouring channels comprise a straight pouring channel connected with the bottom of the pouring cup through a right angle bend and a transverse pouring channel with a trapezoid cross section, a plurality of groups of T-shaped or square slag collecting bags communicated with the transverse pouring channel, and a U-shaped inner pouring channel led out from the bottom of the slag collecting bags; the heat-preserving riser is arranged on the flange surface of the casting of the nodular cast iron wind power main frame, and has feeding effect when the casting is solidified; the combination of a plurality of groups of chill and the heat-preserving riser has positive effects on the solidification of castings.
Description
Technical Field
The invention relates to the technical field of nodular cast iron sand casting, in particular to a bottom pouring type pouring system and a pouring method for a large-scale wind power main frame casting of nodular cast iron.
Background
The wind power main frame is an important component part of the wind generating set and carries important equipment such as wind wheels, generators, speed changers and the like, so that the technical requirements are very high. During the casting process, the impurity content shrinkage porosity and shrinkage cavity of the casting are required to be reduced to the maximum extent so as to obtain higher mechanical properties. The wind power main frame casting is symmetrical structure, the top is bigger flange disc, both sides design has fixed disk, the below is complicated, be equipped with the thick wall of air hole, whole casting structure is complicated, the wall thickness is uneven. In order to ensure the defect of lower casting, a reasonable design of a pouring system and a pouring method are important.
In the casting process, molten metal flows into a casting system at a higher temperature and higher speed and is liable to impact a cavity of a sand mold, so that impurities are wrapped and flow into the cavity. Excessive impurities can influence the performance of the casting, the mechanical property of the casting can be greatly reduced, and the surface flatness of the casting can be reduced due to the fact that the cavity is impacted by molten metal or mixed with molten metal. Generally, factories reduce the impurity content of castings by controlling the flow rate of molten metal or adding filter residue pieces into a pouring system, which are all required to be realized by designing or modifying the pouring system.
The existing filter residue means are to place filter residue pieces or set a residue blocking channel in a sprue or an ingate. The former is used for small castings, the slag collection amount is limited, and impurities generated in a runner cannot be blocked. Second, excessive inclusions can clog the runner, severely impeding the flow of molten metal, and even result in casting under-pouring. The latter has lower residue filtering rate, can not completely block slag, and partial impurities can flow into a cavity along with molten metal, so that the performance of the casting is reduced.
Disclosure of Invention
The invention aims to provide a bottom pouring type pouring system and a pouring method for a large-scale wind power main frame casting of spheroidal graphite cast iron aiming at the defects in the prior art.
In order to achieve the purpose, the bottom pouring type pouring system of the nodular cast iron large wind power main frame casting is characterized by comprising the following components:
the pouring device comprises pouring cups, a sprue and a runner, wherein the pouring cups, the sprue and the runner are sequentially connected according to the flow direction of the molten metal, the pouring cups are arranged above a cavity and are positioned on the symmetrical surface of the cavity, the pouring cups are connected with the sprue for guiding, two groups of the sprue are symmetrically distributed, and the runner is arranged at two ends of the cavity and is connected with the sprue for guiding;
the filtering device is used for filtering molten metal inclusion during pouring, the input end of the filtering device is from the transverse pouring gate, and the output end of the filtering device is an inner pouring gate of the pouring mechanism;
the pouring mechanism is used for introducing molten metal into the cavity and comprises an inner pouring channel which is communicated with the bottom surface of the filtering device and is connected to the bottom surface of the cavity through a right-angle bend, so that the speed of the molten metal flowing into the cavity is buffered;
a chill for assisting solidification of the casting, the chill being secured in the sand and communicating with the mold cavity.
As the preferable technical means, in order to reduce the probability of shrinkage porosity and shrinkage cavity generated during casting solidification and improve the quality of the casting, the casting feeding mechanism further comprises a plurality of heat insulation risers, 5 heat insulation risers are arranged in total for maximally improving feeding space, the heat insulation risers are uniform in shape and size, are distributed at the positions of the cavities forming the flange surface of the casting in a circumferential array at equal intervals, and have the same symmetry plane with the cavities. The heat preservation riser can slow down the cooling rate of the molten metal in the heat preservation riser, and the casting is fed.
As a preferable technical means, in order to reasonably control the flow speed of molten metal and reduce the content of molten slag, a gate is arranged at two thirds of the length of the square pouring cup, the gate divides the square pouring cup into a longer first compartment and a shorter second compartment, the bottom surface of the square pouring cup is positioned under the gate and protrudes downwards to form a bulge, a groove is formed at the bulge, a flow channel is formed between the lower edge of the gate and the groove, molten metal is injected from the first compartment, enters the second compartment through the flow channel under the gate, and is influenced by the flow of molten metal, molten slag can be accumulated at the top of the second compartment, and the content of impurities entering the pouring channel along with the flow is greatly reduced;
the two straight pouring channels have the same size and are connected with the bottom surface of the pouring cup through right-angle bends;
the two cross runners are identical in size and symmetrically arranged at two ends of the cavity, the middle section of the cross runner is vertical cylindrical, the cross sections of the rest parts of the cross runners are trapezoid, and the straight runner is connected to the bottom end of the vertical cylindrical middle section through a right-angle bend.
As a preferable technical means, in order to filter slag in the molten metal and sand inclusion generated when impacting the pouring gate, the content of impurities in the molten metal is further reduced,
the filtering device comprises a plurality of T-shaped slag collecting bags and two square slag collecting bags, wherein the T-shaped slag collecting bags are connected to the middle part of the transverse runner in a dispersed manner, the two square slag collecting bags are connected to the tail end of the transverse runner, and the T-shaped slag collecting bags and the square slag collecting bags have larger buffer space in the flowing direction of metal liquid, so that the flowing speed of the metal liquid can be effectively slowed down, and the filtering effect is improved;
the T-shaped slag collecting bag and the square slag collecting bag are equally divided into an upper layer, a middle layer and a lower layer and are in a form of small upper ends and small lower ends and big middle ends; the upper layer is connected with the lateral surface of the runner through a flat bridging channel; the middle layer is a filter residue piece which is matched with the shape of the T-shaped slag collecting bag; in order to enable the molten metal to smoothly flow into the inner pouring gate, an inclined plane is formed on the bottom surface of the lower layer and is connected with the inner pouring gate in parallel, after the molten metal flows into the slag collecting ladle, the molten metal flows into the lower layer through the filter residue sheet of the middle layer and then flows into the inner pouring gate, and the filter residue in the molten metal is reserved on the upper layer of the slag collecting ladle.
In order to ensure smooth filling of molten metal and reduce oxidation of the molten metal, the pouring mechanism comprises a plurality of pouring gates which are U-shaped, and 1-2 pouring gates are led out from the bottom surface of each T-shaped slag collecting ladle and the bottom surface of each square slag collecting ladle and are connected to the bottom surface of the die cavity at different angles.
As a preferable technical means, in order to maximally improve the feeding space, the shape and the size of the heat-preserving riser are consistent, and the part of the heat-preserving riser, which is a cylindrical riser and is connected with the casting cavity, is in an inverted truncated cone shape.
As a preferable technical means, in order to improve the solidification speed of the casting thin wall, a hot joint of the casting thick wall is moved, and a heat preservation riser is assisted to divide a feeding area, wherein the chilling device comprises a plurality of square chillers, a plurality of cylindrical chillers and a group of conformal chillers;
the square chill has the same size and thickness; the square chill is distributed at uniform intervals; the square chill is regularly distributed on the bottom surface and the side surface of the cavity so as to be beneficial to movement of a hot joint, and the square chill is distributed between the heat-preserving risers at intervals so as to divide the feeding range of the heat-preserving risers;
the bottom surface of the cylindrical chill is smaller than the casting plane and can be attached to the surface of the casting, and the thickness of the cylindrical chill is 0.5-0.7 times of the wall thickness of the casting; the columnar chill is uniformly distributed at the casting thin wall to promote the cooling speed of the thin wall area, and the columnar chill is staggered around the square chill to improve the chilling range;
the conformal chill arrays are arranged in cylindrical pipelines corresponding to castings, so that the solidification speed of the pipelines is promoted.
In order to achieve the purpose, the bottom pouring method for the casting of the large-scale wind power main frame of the nodular cast iron is characterized by comprising the following steps of: the bottom pouring system is adopted to realize, and the method comprises the following steps: and the molten metal is drained to the pouring mechanism through the drainage device, the casting is filled from the bottom of the cavity, and the flange surface and the bottom of the casting formed by the cavity are respectively fed through the heat-preserving riser and the inner runner, so that the probability of shrinkage porosity and shrinkage cavity of the casting is reduced.
In order to reasonably utilize the pouring system to finish the mold filling of castings, the metal liquid is injected from a first compartment of the pouring cup, flows into a second compartment through a runner at the bottom of a gate of the pouring cup, then enters a straight runner, flows into a cross runner under the action of gravity acceleration, is then split into a T-shaped slag collecting ladle and a square slag collecting ladle, and flows into a cavity through an inner runner under the action of slag blocking of a slag filtering sheet, so that the metal liquid is stably filled from bottom to top to reduce the content of impurities.
Compared with the prior art, the invention has at least one of the following beneficial effects:
according to the bottom pouring type pouring system and method, the pouring mechanism is utilized to slowly fill the casting from the bottom of the casting, so that splashing and turbulence of molten metal in a cavity are avoided, the strength of the molten metal for impacting molding sand is effectively reduced, and the risk of inclusion is reduced.
According to the bottom pouring type pouring system and method, the filtering device is used for filtering particle impurities in the molten metal, so that the purity of the molten metal is improved, and the improvement of the mechanical property of castings is facilitated.
According to the bottom pouring type pouring system and method, the solidification speed of the thin wall of the casting is improved, the solidification effect of the thick wall of the casting is improved, and the formation of shrinkage porosity and shrinkage cavity in the casting is effectively reduced through the feeding effect of the heat preservation riser and the chilling effect of the chill.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a perspective view from above of a casting bottom pouring system for a large wind turbine main frame casting of ductile iron in accordance with a preferred embodiment of the present invention;
FIG. 2 is a perspective view from the bottom of the bottom pouring system of FIG. 1;
FIG. 3 is a perspective view from above of a single-sided runner of the bottom-pouring system of FIGS. 1-2;
FIG. 4 is a bottom front perspective view of a single side runner of the bottom pouring system of FIGS. 1-2;
the reference numerals in the figures illustrate: 1-pouring cup, 2-gate, 3-sprue, 4-runner, 5-bridging channel, 6-slag collecting ladle, 7-slag filtering sheet, 8-runner, 9-casting, 10-heat insulation riser and 11-chill.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Referring to fig. 1 and 2, a bottom pouring system of a large-scale wind power main frame casting of spheroidal graphite cast iron and a casting 9 prepared by pouring the system are shown in a preferred embodiment of the invention, wherein the bottom pouring system comprises a drainage device, a pouring inlet mechanism, a filtering device and a chilling device. In fig. 1-2, the casting 9 is a wind power main frame casting product obtained after molten metal is poured into a cavity, and the shape, the outline and the position of the casting in a pouring system are consistent with the cavity before pouring.
The casting 9 is a nodular cast iron large wind power main frame casting. The wind power main frame casting is symmetrical structure, the top is bigger flange disc, both sides design has fixed disk, the below is complicated, be equipped with the thick wall of air hole, whole casting structure is complicated, the wall thickness is uneven.
The drainage device comprises a pouring cup 1, a sprue 3 and a runner 4.
The pouring cup 1 is arranged above the cavity and is positioned on the symmetrical surface of the cavity, and the pouring cup 1 deviates from the vertical center line of the cavity. The pouring cup 1 is connected with the sprue 3.
The sprue 3 has two groups and is symmetrically distributed.
The cross gate 4 is arranged at two ends of the cavity and is connected with the cross gate 4.
The input end of the filtering device comes from the cross runner 4, and the output end of the filtering device is an inner runner 8 of the pouring mechanism.
The pouring mechanism comprises an inner pouring channel 8 and an insulating riser 10. The inner runner 8 is communicated with the bottom surface of the slag ladle 6 and is connected to the bottom surface of the die cavity through a right-angle bend, so that the speed of molten metal flowing into the die cavity is buffered.
The chill comprises a chill 11, the chill 11 being fixed in the moulding sand and communicating with the mould cavity of the casting 9.
The heat-insulating risers 10 are arranged on the flange surface at the top end of the casting, the total number of the heat-insulating risers 10 is 5, the heat-insulating risers are distributed at the die cavity forming the flange surface of the casting in a circumferential array at equal intervals, and the heat-insulating risers and the die cavity have the same symmetrical surface. The insulated riser 10 can slow down the cooling rate of molten metal in the cavity and feed the castings.
By adopting the bottom pouring type pouring system, the metal liquid passing through the filtering device slowly fills the mold from the bottom of the mold cavity upwards, so that splashing of the metal liquid is avoided, and formation of inclusions in castings is effectively reduced.
Referring to figures 2, 3 and 4 in more detail, the drainage device comprises a square pouring cup 1, two sprue 3 and two runner 4. Wherein, two thirds of the length of the square pouring cup 1 is provided with a gate, the gate divides the square pouring cup 1 into a longer first compartment and a shorter second compartment, the part of the bottom surface of the square pouring cup, which is positioned under the gate, protrudes downwards to form a bulge and forms a groove at the bulge, and a U-shaped flow channel is formed between the lower edge of the gate and the groove. During pouring, molten metal is poured into the first compartment, flows into the second compartment through the U-shaped runner, and flows into the sprue from the second compartment. The two straight pouring channels 3 are identical in size and symmetrically distributed. The two straight pouring channels 3 are connected with the bottom surface of the pouring cup 1 through right-angle bends. The two transverse runners 4 are identical in size and symmetrically arranged at two ends of the cavity, the middle section of the transverse runner 4 is vertical cylindrical, the cross sections of the rest parts of the transverse runner 4 are trapezoid, and the straight runner 3 is connected to the bottom end of the vertical cylindrical middle section through a right-angle bend.
Referring to fig. 3 and 4, the filtering device includes a plurality of slag ladles 6. The slag ladle 6 is divided into a T-shaped slag ladle and a square slag ladle, and the structures of the two slag ladles are basically consistent. The T-shaped slag collecting bag and the square slag collecting bag are equally divided into an upper layer, a middle layer and a lower layer and are in a form of small upper ends and small lower ends and big middle; the upper layer is connected with the lateral surface of the runner 4 through a flat bridging channel 5; the middle layer is a filter residue sheet 7 which is matched with the shape of the T-shaped slag collecting bag; the lower layer is connected with an inner pouring channel 8. In order to guide the molten metal to flow, the molten metal is prevented from being retained in the slag collecting ladle, and an inclined plane of 5-10 degrees is formed on the bottom surface of the lower layer of the slag collecting ladle to guide the molten metal to flow. The plurality of T-shaped slag collecting bags are connected to the middle part of the transverse runner in a dispersed mode, and the two square slag collecting bags are connected to the tail end of the transverse runner.
A specific gating system is configured to: the pouring cup 1 is 1150mm long, 760mm wide and 600mm high. The side face of the gate 2 is provided with a bevel angle of 2 degrees, the bottom face of the gate 2 is 70mm thick, the gate 2 is 625mm high, and the bottom face of the gate 2 is 55mm away from the bottom face of the pouring cup. The diameter of the sprue 3 is 80mm, and the vertical height 2140mm. The cross runner 4 is 2145mm long, 50mm in minimum width of cross section, 70mm in maximum width of cross section and 80mm in height, and the diameter of the vertical cylindrical middle section is 100mm. The slag ladle 6 has a thickness of 130mm. The bridge channel 5 is 90mm long and 20mm thick. The inner pouring channels 8 are U-shaped, 1-2 inner pouring channels 8 are led out from the bottom surface of each slag collecting bag 6, and are connected to the bottom surface of the cavity 9 at different angles. The diameter of the ingate 8 is 50mm and the vertical height is 788mm.
The heat preservation riser 10 is a cylindrical riser, the bottom of the heat preservation riser is an inverted circular table, the diameter of a bottom circle is 124mm, the diameter of an upper circle is 400mm, the height of the circular table is 120mm, and the total height of the riser is 310mm. The shape and the size of each heat-insulating riser are consistent.
The chiller 11 includes a plurality of square chills, a plurality of cylindrical chills, and a set of conformal chills. The square chilling blocks are uniform in size and thickness, 90mm in length and width and 100mm in thickness, and the minimum interval between the square chilling blocks is 25mm. Square chill is distributed on the bottom surface and the side surface of the cavity regularly to facilitate movement of the hot joint, and the square chill is distributed between the heat-preserving risers at intervals to divide the feeding range of the heat-preserving risers. The diameter and thickness of the cylindrical chill are determined according to the shape and space of the surface of the casting 9, and as a principle, the bottom surface of the cylindrical chill is smaller than the casting plane and can be attached to the surface of the casting, and the thickness of the cylindrical chill is 0.5-0.7 times of the wall thickness of the casting. The columnar chill is uniformly distributed at the thin wall of the corresponding casting to promote the cooling speed of the thin wall area, and the columnar chill is staggered around the square chill to improve the chilling range. The conformal chill arrays are in the cylindrical pipelines of the corresponding castings to promote the solidification speed of the pipelines.
The pouring system with the specification is used for pouring the large-scale nodular cast iron wind power main frame casting with the following specification: the diameter of the inner circle of the flange surface of the wind power main frame 2424mm, the diameter of the outer circle of the flange surface of the wind power main frame 2835mm, the maximum length 4533mm, the width 4217mm, the maximum height 1772mm, the maximum wall thickness 100mm and the minimum wall thickness 30mm.
Based on the pouring system, a bottom pouring type pouring method is adopted for pouring:
and the molten metal is drained to the pouring mechanism through the drainage device, the casting is filled from the bottom of the cavity, and the flange surface and the bottom of the casting formed by the cavity are respectively fed through the heat-preserving riser and the inner runner, so that the probability of shrinkage porosity of the casting is reduced. The molten metal flows into the second compartment from the first compartment of the pouring cup 1 through the U-shaped runner at the bottom of the pouring cup gate, then enters the sprue, flows into the runner under the action of gravity acceleration, then is split into the T-shaped slag collecting ladle and the square slag collecting ladle, and relatively pure molten metal flows into the cavity through the inner runner under the action of slag blocking of the slag filtering sheet, so that the molten metal is stably filled from bottom to top to reduce the content of impurities. The molten metal can flow through the U-shaped flow channel at the bottom of the gate, so that the splashing of the molten metal can be effectively controlled, and the inclusion is reduced.
According to the invention, by means of the multi-layer structural design of the drainage device, the filtering device and the pouring mechanism of the pouring system, the flow rate of molten metal flowing out of the inner pouring gate (outlet of the inner pouring gate) is slowed down, impurities of molten metal in the cavity are reduced, the quality of castings is effectively improved, meanwhile, the solidification of castings is assisted by the heat-insulating riser and the chill, the formation of shrinkage porosity and shrinkage porosity is greatly reduced, the mechanical property of the nodular cast iron wind power main frame is improved, and the service life of wind power equipment is prolonged to a certain extent.
The foregoing description of the preferred embodiments of the invention has been presented only for the purposes of illustration and description. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (9)
1. A casting bottom pouring type pouring system of a large-scale wind power main frame casting of spheroidal graphite cast iron is characterized by comprising:
the pouring device comprises pouring cups, a sprue and a runner, wherein the pouring cups, the sprue and the runner are sequentially connected according to the flow direction of the molten metal, the pouring cups are arranged above a cavity and are positioned on the symmetrical surface of the cavity, the pouring cups are connected with the sprue for guiding, two groups of the sprue are symmetrically distributed, and the runner is arranged at two ends of the cavity and is connected with the sprue for guiding;
the filtering device is used for filtering molten metal inclusion during pouring, the input end of the filtering device is from the transverse pouring gate, and the output end of the filtering device is an inner pouring gate of the pouring mechanism;
the pouring mechanism is used for introducing molten metal into the cavity and comprises an inner pouring channel which is communicated with the bottom surface of the filtering device and is connected to the bottom surface of the cavity through a right-angle bend;
a chill for assisting solidification of the casting, the chill being secured in the sand and communicating with the mold cavity.
2. The nodular cast iron large wind power main frame casting bottom pouring system according to claim 1, which is characterized in that: the casting mechanism further comprises a plurality of heat-preserving risers which are distributed at the die cavity forming the casting flange surface in a circumferential array at equal intervals and have the same symmetrical surface with the die cavity.
3. The nodular cast iron large wind power main frame casting bottom pouring system according to claim 1, which is characterized in that: the pouring cup is square, a gate is arranged at two thirds of the length of the square pouring cup, the gate divides the square pouring cup into a longer first compartment and a shorter second compartment, the part of the bottom surface of the square pouring cup, which is positioned right below the gate, protrudes downwards to form a bulge, a groove is formed at the bulge, and a flow passage is formed between the lower edge of the gate and the groove;
the two straight pouring channels have the same size and are connected with the bottom surface of the pouring cup through right-angle bends;
the two cross runners are identical in size and symmetrically arranged at two ends of the cavity, the middle section of the cross runner is vertical cylindrical, the cross sections of the rest parts of the cross runners are trapezoid, and the straight runner is connected to the bottom end of the vertical cylindrical middle section through a right-angle bend.
4. The nodular cast iron large wind power main frame casting bottom pouring system according to claim 1, which is characterized in that:
the filtering device comprises a plurality of T-shaped slag collecting bags and two square slag collecting bags, wherein the T-shaped slag collecting bags are connected to the middle part of the transverse runner in a dispersed manner, and the two square slag collecting bags are connected to the tail end of the transverse runner;
the T-shaped slag collecting bag and the square slag collecting bag are equally divided into an upper layer, a middle layer and a lower layer and are in a form of small upper ends and small lower ends and big middle ends; the upper layer is connected with the lateral surface of the runner through a flat bridging channel; the middle layer is a filter residue piece which is matched with the shape of the T-shaped slag collecting bag; and an inclined plane is formed on the bottom surface of the lower layer and the inner pouring channel is led in parallel.
5. The bottom pouring system of the nodular cast iron large wind power main frame casting, which is characterized in that: the pouring mechanism comprises a plurality of pouring gates, the pouring gates are U-shaped, and 1-2 pouring gates are led out from the bottom surface of each T-shaped slag collecting bag and the bottom surface of each square slag collecting bag and are connected to the bottom surface of the cavity at different angles.
6. The nodular cast iron large wind power main frame casting bottom pouring system according to claim 2, which is characterized in that: the shape and the size of the heat preservation riser are consistent, and the part of the heat preservation riser which is a cylindrical riser and connected with the cavity is in an inverted truncated cone shape.
7. The nodular cast iron large wind power main frame casting bottom pouring system according to claim 1, which is characterized in that: the chilling device comprises a plurality of square chill blocks, a plurality of cylindrical chill blocks and a group of conformal chill blocks;
the square chill has the same size and thickness; the square chill is distributed at uniform intervals; the square chill is regularly distributed on the bottom surface and the side surface of the cavity so as to be beneficial to movement of a hot joint, and the square chill is distributed between the heat-preserving risers at intervals so as to divide the feeding range of the heat-preserving risers;
the bottom surface of the cylindrical chill is smaller than the casting plane and can be attached to the surface of the casting, and the thickness of the cylindrical chill is 0.5-0.7 times of the wall thickness of the casting; the columnar chill is uniformly distributed at the thin wall of the corresponding casting so as to promote the cooling speed of the thin wall area, and the columnar chill is staggered around the square chill so as to improve the chilling range;
the conformal chill arrays are arranged in cylindrical pipelines corresponding to castings, so that the solidification speed of the pipelines is promoted.
8. A bottom pouring type pouring method for a large-scale wind power main frame casting of spheroidal graphite cast iron is characterized by comprising the following steps: implemented with the bottom-pouring system of any one of claims 1-7, the method comprising: and the molten metal is drained to the pouring mechanism through the drainage device, the casting is filled from the bottom of the cavity, and the flange surface and the bottom of the casting formed by the cavity are respectively fed through the heat-preserving riser and the inner runner, so that the probability of shrinkage porosity and shrinkage cavity of the casting is reduced.
9. The method for bottom pouring of the nodular cast iron large wind power main frame casting, which is characterized in that: the molten metal is injected from the first compartment of the pouring cup, flows into the second compartment through the runner at the bottom of the gate of the pouring cup, then enters the sprue, flows into the cross runner under the action of gravity acceleration, then is split into the T-shaped slag collecting ladle and the square slag collecting ladle, and flows into the cavity through the inner runner by the slag blocking effect of the slag filtering sheet, so that the molten metal is stably filled from bottom to top to reduce the impurity content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310954505.0A CN116944427A (en) | 2023-07-31 | 2023-07-31 | Bottom pouring type pouring system and pouring method for casting of large nodular cast iron wind power main frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310954505.0A CN116944427A (en) | 2023-07-31 | 2023-07-31 | Bottom pouring type pouring system and pouring method for casting of large nodular cast iron wind power main frame |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118123001A (en) * | 2024-05-06 | 2024-06-04 | 内蒙古正能化工集团有限公司 | Improved energy-saving rotary kiln casting molding equipment and method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118123001A (en) * | 2024-05-06 | 2024-06-04 | 内蒙古正能化工集团有限公司 | Improved energy-saving rotary kiln casting molding equipment and method thereof |
| CN118123001B (en) * | 2024-05-06 | 2024-08-27 | 内蒙古正能化工集团有限公司 | Improved energy-saving rotary kiln casting molding equipment and method thereof |
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