CN114101628A - Amorphous alloy gear and casting mold and method thereof - Google Patents
Amorphous alloy gear and casting mold and method thereof Download PDFInfo
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- CN114101628A CN114101628A CN202111482071.6A CN202111482071A CN114101628A CN 114101628 A CN114101628 A CN 114101628A CN 202111482071 A CN202111482071 A CN 202111482071A CN 114101628 A CN114101628 A CN 114101628A
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- 238000005266 casting Methods 0.000 title claims abstract description 84
- 229910000808 amorphous metal alloy Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 51
- 239000000956 alloy Substances 0.000 claims abstract description 51
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000010949 copper Substances 0.000 claims description 43
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 37
- 229910052802 copper Inorganic materials 0.000 claims description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 36
- 230000006698 induction Effects 0.000 claims description 35
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 34
- 238000003723 Smelting Methods 0.000 claims description 31
- 238000002844 melting Methods 0.000 claims description 28
- 230000008018 melting Effects 0.000 claims description 28
- 239000000725 suspension Substances 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 18
- 229910052786 argon Inorganic materials 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 10
- 238000005339 levitation Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000004519 grease Substances 0.000 claims description 7
- 229920001296 polysiloxane Polymers 0.000 claims description 7
- 239000000741 silica gel Substances 0.000 claims description 7
- 229910002027 silica gel Inorganic materials 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 3
- 238000007605 air drying Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000010312 secondary melting process Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 10
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 10
- 229910052726 zirconium Inorganic materials 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000007787 solid Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/11—Making amorphous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/10—Amorphous alloys with molybdenum, tungsten, niobium, tantalum, titanium, or zirconium or Hf as the major constituent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C2200/00—Crystalline structure
- C22C2200/02—Amorphous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
- F16H2055/065—Moulded gears, e.g. inserts therefor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention belongs to the technical field of amorphous alloy gear preparation. The invention discloses an amorphous alloy gear casting method, which comprises the steps of preparing raw materials, preparing an alloy spindle, assembling a mold, casting and filling a mold in sequence, and taking out a casting after the whole mold is cooled to room temperature to obtain a micro gear casting with an amorphous alloy structure.
Description
Technical Field
The invention belongs to the technical field of amorphous alloy gear preparation, and particularly relates to an amorphous alloy gear, a casting mold and a casting method thereof.
Background
In recent years, with the rapid development of large-scale integrated circuits and information technologies, micro-electro-mechanical systems (MEMS) integrating multiple functions such as information acquisition, signal sensing, mechanical transmission, etc. have the advantages of small size, light weight, low power consumption, good durability, stable performance, etc., have been widely developed and started to be put to practical use in the fields of automobile industry, aerospace, military, medical treatment, biotechnology, etc., and are regarded as important technical approaches of new national economic growth points in the 21 st century. Among them, the micro gear is an important component of the MEMS device, and its low-cost, high-efficiency, high-precision, and large-scale manufacturing technology has become an important core content for the study of the MEMS device by the scholars at home and abroad.
At present, the micro gear is mainly made of high-strength and high-wear-resistance materials such as traditional hard alloy or hardened and tempered steel. However, compared with the traditional metal alloy, the amorphous alloy has excellent mechanical properties due to the special microstructure, such as disordered long-range atomic arrangement and ordered short-range atomic arrangement, and no defects of dislocation, grain boundary and the like of a crystal material, and simultaneously has unique vitrification characteristics and superplasticity in a supercooled liquid phase region.
Disclosure of Invention
The invention provides an amorphous alloy gear, a casting mold and a casting method thereof, and aims to obtain the amorphous alloy gear.
A casting mould of an amorphous alloy gear comprises a cover, an upper mould, a lower mould and a fixing ring; the cover is provided with a vent hole, the upper die is provided with an air passage which penetrates along the axial direction of the upper die, the lower die is provided with a cavity and a sprue, gear teeth are arranged in the cavity and connected with the sprue, and the sprue is used for introducing alloy melt into the cavity; the cover is used for being connected with a casting connecting rod and can be connected with the upper die, so that the air passage is communicated with the vent hole; the fixing ring is used for axially and hermetically connecting the upper die with the lower die, and the air passage is communicated with the cavity.
Preferably, the upper die and the lower die are fixedly connected in a detachable mode, and a contact surface between the upper die and the lower die is sealed by silicone grease.
Preferably, the fixing ring is in threaded connection with the upper die and the lower die; wherein, go up the mould with the lower mould all is equipped with the external screw thread, the retaining ring is equipped with corresponding internal thread.
Preferably, the casting mould of the amorphous alloy gear further comprises a quartz glass tube; one end of the quartz glass tube is connected with the sprue, and the other end of the quartz glass tube is communicated with the melt.
Further preferably, the quartz glass tube and the sprue are connected in a sealing manner by silica gel.
Preferably, the lid the lower mould with solid fixed ring all adopts the preparation of brass material, go up the mould and adopt the preparation of red copper material.
A casting method of an amorphous alloy gear, which adopts the casting mould to cast the amorphous alloy gear, comprises the following steps:
step S1, preparing raw materials; weighing raw materials according to the atomic percentage of the amorphous alloy to be prepared, and carrying out ultrasonic cleaning and air drying on the raw materials;
step S2, preparing an alloy spindle; putting the raw materials obtained in the step S1 into a water-cooled copper crucible magnetic suspension induction melting furnace protected by argon for heating and melting, firstly increasing the power to 1Kw at the speed of increasing the melting power by 0.1Kw every 30S, then increasing the power to 8Kw at the speed of increasing the melting power by 0.5Kw every 30S, then stopping heating and preserving the heat for 1 minute at the power of 8Kw, finally unloading the power to 0 and taking out the alloy ingot obtained after cooling to the normal temperature;
step S3, assembling a mold; firstly, cleaning and airing the casting mold, then, carrying out silicone grease sealing on a parting surface between the upper mold and the lower mold, secondly, inserting a quartz glass tube into the sprue and forming sealing connection with the sprue, then, fixedly connecting the upper mold and the lower mold by using the fixing ring, and finally, connecting the cover and the upper mold and connecting the casting connecting rod with the cover;
step S4, casting and mold filling; firstly, placing the alloy spindle obtained in the step S2 in a water-cooled copper crucible magnetic suspension induction melting furnace in a vacuum state for heating and melting to obtain an alloy melt again, wherein the power is increased to 8Kw and is kept warm for one minute, then the power is reduced to 6Kw and is kept warm for one minute, then a quartz glass tube is stretched into the alloy melt, the pressure difference is formed at the two ends of the cavity, the alloy melt enters the cavity through the quartz glass tube to complete filling, and then the mold is lifted away from the alloy melt;
and step S5, taking out the casting after the mold is cooled to room temperature, and obtaining the amorphous alloy gear casting.
Preferably, in step S2, a secondary smelting process is further included; when the power is unloaded to 0 and cooled to the normal temperature, the power is increased to 1Kw at the speed of increasing the smelting power by 0.1Kw every 30s, then the power is increased to 8Kw at the speed of increasing the smelting power by 0.5Kw every 30s, then the temperature is stopped and is kept for 1 minute at the power of 8Kw, then the power is unloaded to 0 again, and the alloy ingot is taken out to prepare and obtain the final alloy ingot after being cooled to the normal temperature.
Further preferably, in step S4, argon gas is supplied into the water-cooled copper crucible magnetic levitation induction melting furnace by an argon gas supply device, and the pressure in the water-cooled copper crucible magnetic levitation induction melting furnace is increased and maintained at 0.04MPa, thereby pressing the alloy melt into the cavity.
The amorphous alloy gear is prepared by the method and is made of Zr61TI2Cu25Al12 amorphous alloy.
According to the method, raw material preparation, alloy spindle preparation, mold assembly and casting mold filling are sequentially carried out, so that a casting can be taken out after the whole mold is cooled to room temperature, and the micro-gear casting with the amorphous alloy structure is obtained.
Drawings
FIG. 1 is a schematic flow chart of zirconium-based amorphous micro-gear casting by using the casting method of the amorphous alloy gear of the embodiment;
FIG. 2 is a schematic structural diagram of a casting mold in the casting method of an amorphous alloy gear according to the embodiment;
fig. 3 is an XRD chart of a zirconium-based amorphous micro-gear casting prepared by the casting method of the amorphous alloy gear of this embodiment.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
With reference to fig. 1, the method for casting an amorphous alloy gear according to this embodiment is used to perform a process for manufacturing a zirconium-based amorphous micro-gear, which includes the following steps:
in step S1, a raw material is prepared.
Material Z selected for zirconium-based amorphous micro-gearr61TI2Cu25Al12According to material Zr61TI2Cu25Al12Weighing Zr blocks, Cu blocks, Ti blocks and A1 blocks with corresponding mass ratios and 99.99% purity according to the percentages of different atoms, and carrying out ultrasonic cleaning and airing on the raw materials after accurately weighing the Zr blocks, the Cu blocks, the Ti blocks and the A1 blocks in proportion. Wherein the raw materials are put into a wide-mouth bottle filled with absolute ethyl alcohol, andcleaning in ultrasonic wave for more than 15min to remove impurities on the surface of the raw material to complete the cleaning operation, and taking out the raw material from the wide-mouth bottle and placing on clean weighing paper for drying.
And step S2, preparing an alloy spindle.
And (4) putting the cleaned and dried raw materials in the step (S1) into a water-cooled copper crucible magnetic suspension induction melting furnace under the protection of argon gas for heating and melting, wherein the specific process is as follows:
firstly, the induction equipment is started, and the power of the water-cooled copper crucible magnetic suspension induction melting furnace is increased to 1Kw at the speed of increasing the melting power by 0.1Kw every 30 s. Then, the power of the water-cooled copper crucible magnetic levitation induction melting furnace was increased to 8Kw at a rate of increasing the melting power by 0.5Kw every 30 s. Then, the temperature rise was stopped and the temperature of the water-cooled copper crucible magnetic levitation induction melting furnace was maintained at a power of 8Kw for 1 minute. And finally, unloading the power of the water-cooled copper crucible magnetic suspension induction smelting furnace to 0, and taking out the prepared alloy spindle after the water-cooled copper crucible magnetic suspension induction smelting furnace is cooled to normal temperature.
In step S3, the mold is assembled.
Referring to fig. 2, in the method for casting an amorphous alloy gear according to the present embodiment, a casting mold for an amorphous alloy gear is used, and includes a cover 1, an upper mold 2, a lower mold 3, and a fixing ring 4. Wherein the cover 1 is used for connecting with a casting connecting rod, and a vent hole 11 is arranged on the cover 1. An air duct 21 is provided in the upper die 2 so as to penetrate in the axial direction thereof. The lower die 3 is provided with a cavity 31 and a sprue 32, the cavity 31 is internally provided with gear teeth and connected to the sprue 32, and the sprue 32 is used for introducing alloy melt into the cavity 31. The cap 1 can be coupled to the upper die 2, the fixing ring 4 is used for the axial sealing connection between the upper die 2 and the lower die 3, and the air duct 21 is in communication with the cavity 31, while the air duct 21 is in communication with the vent hole 11.
At the moment, in the process of introducing the alloy melt into the cavity through the sprue, gas in the cavity is discharged through the air passage and the vent hole, so that the alloy melt smoothly and quickly enters the cavity of the lower die to complete the mold filling operation. Meanwhile, the casting connecting rod is connected with the cover and the cover is connected with the upper die, so that the casting die can be shifted through the casting connecting rod, and the amorphous alloy gear can be subjected to mold filling casting.
The gear teeth arranged in the middle cavity of the lower die can be adjusted according to the tooth profile of the gear to be cast, so that the casting preparation of the gears with different tooth profile parameters is realized. Even in other embodiments, the cavity can be designed into other structural forms, such as triangle, circle and other shapes, according to different components to be cast, so as to realize the casting operation of different-shape components.
Preferably, in this embodiment, the upper mold 2 and the lower mold 3 are detachably and fixedly connected, and the contact surface between the upper mold 2 and the lower mold 3 is sealed by silicone grease. Like this, through will go up mould and lower mould design for detachable fixed connection to can be different according to the shape of required casting amorphous alloy component, the lower mould that has different die cavities fast more improves the availability factor of this mould, sets up the silicone grease through the contact surface between last mould and lower mould simultaneously and seals, thereby guarantees the gas tightness of mould and lower mould hookup location, and then guarantees the casting quality to amorphous alloy component.
Wherein, in this embodiment, through set up the external screw thread simultaneously on last mould 2 and lower mould 3 to set up corresponding internal thread on solid fixed ring 4, thereby can utilize solid fixed ring 4 to go up the threaded connection between mould 2 and the lower mould 3, realize going up the detachable fixed connection between mould 2 and the lower mould 3. Also, in other embodiments, the upper and lower dies may be detachably fixed to each other by other methods, such as flange connection, according to the sizes and shapes of the upper and lower dies.
In addition, in the present embodiment, Z is a materialr61TI2Cu25Al12The zirconium-based amorphous micro-gear is cast, and a quartz glass tube is also arranged in a casting mould of the amorphous alloy gear. One end of the quartz glass tube is connected with the sprue in a plug-in mode, and the other end of the quartz glass tube is used for extending into the alloy melt, so that the alloy melt is introduced into a cavity of the lower die.
Further, in this embodiment, the silica gel is used to perform the sealing connection between the quartz glass tube and the sprue, that is, the silica gel is disposed on the contact surface where the quartz glass tube and the sprue are formed in the insertion connection, so that the sealing connection between the quartz glass tube and the sprue is realized during the insertion connection of the quartz glass tube and the sprue, the connection airtightness between the quartz glass tube and the sprue is improved, and the casting quality of the amorphous alloy element is ensured.
In addition, in this embodiment, the cover, the lower mold and the fixing ring are made of brass, and the upper mold is made of red copper. Therefore, amorphous alloy is easier to form by utilizing the larger heat conductivity coefficient of the copper material, the die processing is convenient, the size precision of the cavity is ensured, and the casting precision of the amorphous alloy element is improved.
The assembly process for the above mold is as follows:
firstly, the casting mold is cleaned and dried. Wherein, a Metal Polish paste (Metal Polish) is selected to clean the cover, the upper die, the lower die and the fixing ring to remove the adhered impurities such as surface oxide skin, oil stain and the like, and the cover, the upper die, the lower die and the fixing ring are cleaned and dried by using absorbent cotton and alcohol.
And then, silicone grease sealing is carried out on the parting surface between the upper die and the lower die, so that good air tightness between the upper die and the lower die is ensured.
And secondly, connecting the quartz glass tube and the lower die by using silica gel, namely inserting the quartz glass tube into a sprue of the lower die, and arranging the silica gel at the joint of the quartz glass tube and the lower die for sealing.
And then after the silica gel between the quartz glass tube and the lower die is dried, sleeving the fixing rings outside the upper die and the lower die, and fixedly connecting the upper die and the lower die by using the fixing rings in a threaded manner.
Finally, the cover is screwed to the upper die and the casting link is connected to the cover, and the vent hole of the upper cover is communicated with the casting link. Wherein, in this embodiment, adopt threaded connection between lid and the casting connecting rod equally to the quick assembly disassembly of casting connecting rod and this mould is connected, improves the use convenience of this mould.
And step S4, casting and mold filling are carried out.
Firstly, the alloy ingot obtained in the step S2 is placed in a water-cooled copper crucible magnetic suspension induction melting furnace in a vacuum state for heating and melting again to obtain an alloy melt. The power of the water-cooled copper crucible magnetic suspension induction smelting furnace is increased to 8Kw and is kept warm for one minute, and then the power of the water-cooled copper crucible magnetic suspension induction smelting furnace is decreased to 6Kw and is kept warm for one minute.
And then, extending the quartz glass tube into two thirds of the position below the surface of the alloy melt, and enabling the alloy melt to enter a cavity of the lower die through the quartz glass tube under the action of pressure difference formed at two ends of the cavity in the lower die so as to finish the mold filling operation.
And then, lifting the whole die away from the alloy melt through a casting connecting rod, and closing an induction device of the water-cooled copper crucible magnetic suspension induction smelting furnace to unload power.
Preferably, before reheating and smelting the alloy ingot in step S4, the alloy ingot is cleaned and polished in advance to remove an oxide layer on the surface of the alloy ingot, so as to improve the quality of an alloy melt obtained by reheating and smelting the alloy ingot, and further ensure the quality of an amorphous micro-gear obtained subsequently.
And step S5, taking out the casting after the whole mold is cooled to room temperature, and obtaining the zirconium-based amorphous micro-gear casting. And then, cleaning the casting mold and the water-cooled copper crucible magnetic suspension induction smelting furnace, and then casting the amorphous alloy gear for the next time.
Next, the zirconium-based amorphous micro-gear casting obtained in step S5 was examined to obtain an XRD pattern shown in fig. 3. According to the XRD diagram shown in figure 3, the gear casting prepared by the casting method is of an amorphous alloy structure, and mechanical property test is carried out on the zirconium-based amorphous micro-gear casting, so that compared with high-strength and high-wear-resistance materials such as traditional hard alloy and quenched and tempered steel, the zirconium-based amorphous alloy micro-gear casting has higher yield strength and fatigue strength, the surface of the zirconium-based amorphous alloy micro-gear casting can replicate the micro-nano scale fine morphology of a mold, the size precision of the casting is far higher than that of corresponding crystal alloy, and the casting has better surface finish and size precision, so that the quality stability and comprehensive mechanical property of the gear product can be improved without or with a small amount of processing procedures in the subsequent process.
In addition, in the present embodiment, a vacuum negative pressure device and an argon gas supply device are also provided in connection with the water-cooled copper crucible magnetic levitation induction melting furnace, and the water-cooled copper crucible magnetic levitation induction melting furnace is connected with the vacuum negative pressure device and the argon gas supply device through a vacuum pipe provided with a vacuum isolation valve. Thus, argon is supplied to the water-cooled copper crucible magnetic suspension induction smelting furnace by the argon supply device, residual air in the water-cooled copper crucible magnetic suspension induction smelting furnace is diluted, a mixture of argon and residual air in the water-cooled copper crucible magnetic suspension induction smelting furnace is extracted by the vacuum negative pressure device, and an amorphous alloy smelting environment with high vacuum and low oxygen content can be quickly established through multiple cycles of argon supply, vacuumizing, argon supply and vacuumizing, so that the alloy melt is prevented from being oxidized in the smelting process, and the preparation quality of the water-cooled copper crucible magnetic suspension induction smelting furnace on the alloy melt is improved. Meanwhile, in step S4, argon gas of a certain pressure, for example, argon gas of 0.04MPa, is rapidly introduced into the water-cooled copper crucible magnetic levitation induction melting furnace by using the argon gas supply device, so that a pressure difference is instantaneously generated between two ends of the cavity of the lower mold, the alloy melt is pressed into the cavity through the quartz glass tube, and the gas in the cavity is rapidly discharged through the vent hole and the gas passage, thereby realizing the mold filling operation.
Preferably, in step S2 of the casting method of an amorphous alloy gear according to the present embodiment, the casting method further includes a secondary melting process. The secondary smelting treatment comprises the following specific processes: when the unloading power of the water-cooled copper crucible magnetic suspension induction smelting furnace is 0 and the water-cooled copper crucible magnetic suspension induction smelting furnace is cooled to the normal temperature, the power of the water-cooled copper crucible magnetic suspension induction smelting furnace is increased to 1Kw at the speed of increasing the smelting power by 0.1Kw every 30s, then the power of the water-cooled copper crucible magnetic suspension induction smelting furnace is continuously increased to 8Kw at the speed of increasing the smelting power by 0.5Kw every 30s, then the temperature is stopped to be raised, the water-cooled copper crucible magnetic suspension induction smelting furnace is kept at the 8Kw power for 1 minute, then the water-cooled copper crucible magnetic suspension induction smelting furnace is unloaded to 0 again, and the alloy spindle obtained by preparation is taken out after the water-cooled copper crucible magnetic suspension induction smelting furnace is cooled to the normal temperature. At the moment, the alloy spindle is subjected to secondary smelting treatment, so that the smelting uniformity of the alloy can be improved, and the preparation quality of the alloy spindle can be improved.
In addition, in the casting mould of the amorphous alloy gear, the outer surface of the cover is also provided with knurls. Through set up the annular knurl at the lid surface, can increase the frictional force of lid surface to operating personnel carries out the rotation for last mould to the lid, thereby can carry out quick convenient dismouting between lid and the last mould and be connected. In a similar way, the outer surface of the fixing ring is also provided with a knurl so as to improve the convenience of connecting the upper die and the lower die by the fixing ring.
In addition, the diameter size design of air vent is for being no less than the diameter size of air flue to can make the gas in the die cavity get into the air vent through the air flue fast, and then realize quick exhaust effect. In the present embodiment, as shown in fig. 2, the vent hole 11 is provided at the center of the cap 1 and has a diameter of 1mm, the gas duct 21 is provided at the center of the upper mold 2 and has a diameter of 1mm, and the cavity 31 and the sprue 32 are provided at the center of the lower mold 3. Like this, after being connected lid and last mould, just can make air vent and air flue form to align the relation of connection to air flue and pore formation uniform cross section gas passage, thereby can make the gas of die cavity discharge through air vent and air flue fast smoothly filling the type in-process, and then guarantee to fill quality and the effect of type.
Claims (10)
1. The casting mold for the amorphous alloy gear is characterized by comprising a cover, an upper mold, a lower mold and a fixing ring; the cover is provided with a vent hole, the upper die is provided with an air passage which penetrates along the axial direction of the upper die, the lower die is provided with a cavity and a sprue, gear teeth are arranged in the cavity and connected with the sprue, and the sprue is used for introducing alloy melt into the cavity; the cover is used for being connected with a casting connecting rod and can be connected with the upper die, so that the air passage is communicated with the vent hole; the fixing ring is used for axially and hermetically connecting the upper die with the lower die, and the air passage is communicated with the cavity.
2. The casting mold for the amorphous alloy gear according to claim 1, wherein the upper mold and the lower mold are fixedly connected in a detachable manner, and a contact surface between the upper mold and the lower mold is sealed by silicone grease.
3. The casting die for the amorphous alloy gear according to claim 2, wherein the fixing ring is in threaded connection with the upper die and the lower die; wherein, go up the mould with the lower mould all is equipped with the external screw thread, the retaining ring is equipped with corresponding internal thread.
4. The casting mold for amorphous alloy gear according to claim 1, further comprising a quartz glass tube; one end of the quartz glass tube is connected with the sprue, and the other end of the quartz glass tube is communicated with the melt.
5. The casting mold for the amorphous alloy gear according to claim 4, wherein the quartz glass tube is hermetically connected with the sprue by using silica gel.
6. A casting mold for an amorphous alloy gear according to any one of claims 1 to 5, wherein the cover, the lower mold and the fixing ring are made of brass, and the upper mold is made of red copper.
7. A casting method of an amorphous alloy gear, which is characterized in that the casting mold of any one of claims 1 to 6 is adopted for casting the amorphous alloy gear, and the casting method specifically comprises the following steps:
step S1, preparing raw materials; weighing raw materials according to the atomic percentage of the amorphous alloy to be prepared, and carrying out ultrasonic cleaning and air drying on the raw materials;
step S2, preparing an alloy spindle; putting the raw materials obtained in the step S1 into a water-cooled copper crucible magnetic suspension induction melting furnace protected by argon for heating and melting, firstly increasing the power to 1Kw at the speed of increasing the melting power by 0.1Kw every 30S, then increasing the power to 8Kw at the speed of increasing the melting power by 0.5Kw every 30S, then stopping heating and preserving the heat for 1 minute at the power of 8Kw, finally unloading the power to 0 and taking out the alloy ingot obtained after cooling to the normal temperature;
step S3, assembling a mold; firstly, cleaning and airing the casting mold, then, carrying out silicone grease sealing on a parting surface between the upper mold and the lower mold, secondly, inserting a quartz glass tube into the sprue and forming sealing connection with the sprue, then, fixedly connecting the upper mold and the lower mold by using the fixing ring, and finally, connecting the cover and the upper mold and connecting the casting connecting rod with the cover;
step S4, casting and mold filling; firstly, placing the alloy spindle obtained in the step S2 in a water-cooled copper crucible magnetic suspension induction melting furnace in a vacuum state for heating and melting to obtain an alloy melt again, wherein the power is increased to 8Kw and is kept warm for one minute, then the power is reduced to 6Kw and is kept warm for one minute, then a quartz glass tube is stretched into the alloy melt, the pressure difference is formed at the two ends of the cavity, the alloy melt enters the cavity through the quartz glass tube to complete filling, and then the mold is lifted away from the alloy melt;
and step S5, taking out the casting after the mold is cooled to room temperature, and obtaining the amorphous alloy gear casting.
8. The method for casting an amorphous alloy gear according to claim 7, further comprising a secondary melting process in the step S2; when the power is unloaded to 0 and cooled to the normal temperature, the power is increased to 1Kw at the speed of increasing the smelting power by 0.1Kw every 30s, then the power is increased to 8Kw at the speed of increasing the smelting power by 0.5Kw every 30s, then the temperature is stopped and is kept for 1 minute at the power of 8Kw, then the power is unloaded to 0 again, and the alloy ingot is taken out to prepare and obtain the final alloy ingot after being cooled to the normal temperature.
9. The method of casting an amorphous alloy gear according to claim 7, wherein in step S4, argon gas is supplied into the water-cooled copper crucible magnetic levitation induction melting furnace by an argon gas supply device, and the pressure in the water-cooled copper crucible magnetic levitation induction melting furnace is increased and maintained at 0.04MPa, thereby pressing the alloy melt into the cavity.
10. An amorphous alloy gear, which is prepared by the method of any one of claims 7 to 9 and is made of Zr61TI2Cu25Al12And (3) amorphous alloy.
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