CN111774528A - Manufacturing method of high manganese steel track shoe shell - Google Patents
Manufacturing method of high manganese steel track shoe shell Download PDFInfo
- Publication number
- CN111774528A CN111774528A CN202010568948.2A CN202010568948A CN111774528A CN 111774528 A CN111774528 A CN 111774528A CN 202010568948 A CN202010568948 A CN 202010568948A CN 111774528 A CN111774528 A CN 111774528A
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- wax
- mould
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- shell
- wax mould
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- 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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a manufacturing method of a high manganese steel track shoe shell. The method comprises the following specific steps: firstly, pressing a wax mould; a second step of pressing a wax mould by using a metal mould to manufacture a primary shell; thirdly, manufacturing a shell and roasting; winding the primary shell by using rock wool before roasting, wherein the first layer of rock wool is wound on the die head of the primary shell until 2/3 of the length of the primary shell body, and the surface of the wound part is completely wrapped; winding the second layer of rock wool on the primary shell die head part, namely winding the second layer of rock wool on the first layer of rock wool on the die head part, and then binding the rock wool by using iron wires; finally, roasting in a roasting furnace, wherein the roasting time is more than 25 minutes, and the roasting temperature is 900-1250 ℃. The invention improves the quality and performance of the high manganese steel plate body, solves the problem of no white slag generated in silica sol investment casting, and can meet the quality requirement of castings.
Description
Technical Field
The invention belongs to the technical field of special casting and smelting, and particularly relates to a manufacturing method of a high manganese steel track shoe shell.
Background
The creeper tread is a part of a crawler walking part of a main battle tank in direct contact with the ground, the casting is ZGMn13-1, the working environment and the using environment of the creeper tread are extremely severe, the creeper tread is in direct contact with the ground of soil, gravels and cement in the walking process, alternating load and the self weight of the tank are directly and indirectly acted on the creeper tread and bear the effects of extrusion bending, great stretching, shearing and other stresses, the creeper tread loses efficacy in long-time movement to generate fatigue damage, and therefore the requirement on the internal quality of the creeper tread is high. The track shoe has complex shape and large difference of wall thickness.
The novel JY1542.009 track shoe needs to be carried out from the aspects of material, casting process, heat treatment, structural modification and the like, and all the aspects of work are based on the analysis and calculation of the mechanical property of the track shoe under the condition of complex stress, and the tensile strength, the bending strength and the running test are carried out on a casting.
Because the working condition is harsh and the stress is complex, the crawler belt plate is particularly used for bearing under the conditions of severe air temperature and geographical environment, and therefore the crawler belt plate is required to have excellent strength, impact resistance and the like. According to the characteristics and the use condition analysis of the track plate, whether the army walking track casting with high quality and excellent performance can be developed or not is critical to the improvement of the mobility and the service life of the army vehicle walking part.
The existing method for producing the high-manganese steel plate body generally adopts sodium silicate sand mold casting, has more surface defects, sand holes, slag holes and air holes, and insufficient casting, and causes poor precision and surface quality.
The manufacturing process of the silica sol shell has high cost and can not realize the white slag manufacturing process
Disclosure of Invention
The invention aims to provide a method for manufacturing a high manganese steel track plate shell, which improves the quality and performance of a high manganese steel plate body, solves the problem that white slag is not produced in silica sol investment casting, and can meet the quality requirement of a casting.
The technical scheme of the invention is as follows: the manufacturing method of the high manganese steel track shoe shell comprises the following specific steps:
firstly, pressing a wax mould; pressing a wax mould by using a metal mould; the wax mould comprises a wax mould body and a mould head, wherein the wax mould body and the mould head are pressed separately at the same time, and 2 wax moulds are pressed at the same time; checking the center distance of the riser surface of the wax piece body, removing unqualified products, firmly welding the qualified wax mould body with the die head, and installing a handle and a cover plate on a pouring cup of the die head;
second, manufacturing a primary shell; immersing 2 wax molds into the silica sol coating, dipping the silica sol, and then sequentially spraying sand and drying;
thirdly, manufacturing a shell and roasting; winding the primary shell by using rock wool before roasting, wherein the first layer of rock wool is wound on the die head of the primary shell until 2/3 of the length of the primary shell body, and the surface of the wound part is completely wrapped; winding the second layer of rock wool on the primary shell die head part, namely winding the second layer of rock wool on the first layer of rock wool on the die head part, and then binding the rock wool by using iron wires; finally, roasting in a roasting furnace, wherein the roasting time is more than 25 minutes, and the roasting temperature is 900-1250 ℃.
In the first step, 1) when the wax mould is pressed, the wax piece body is not allowed to have the defects of cold shut, pits, convex slip and the like; 2) before repairing the wax mould, checking the center distance of the dead head surface of the wax piece body, performing 100% check, breaking all bubbles on the wax mould, and repairing by using repair wax; repairing the flow marks on the non-processing surface of the wax mould by using green wax, and paying attention to the fact that the wax mould is not damaged; the wax mould body has a deep flow mark or a cold shut which is not required to be repaired and directly scrapped; blowing the wax scraps by using an air nozzle, and neatly placing the wax mould in a storage tray; 3) firmly welding the wax mould body and the mould head, wherein no gap is formed at the welding seam, and 100 percent of fillets are required to be transited; strictly stopping the wax from dropping on the wax mould; no gap is reserved between the rear cover plate of the mounting cover plate and the die head pouring cup.
In the second step, when dipping silica sol, after the wax mould is visually inspected to be soaked, the wax mould is drawn out to check whether the wax mould is completely wetted, if the wax mould cannot be completely wetted, the wax mould is cleaned again; sand spraying and drying can be carried out; the second step is carried out for 5-8 times; the mesh number of the sand is increased layer by layer.
The primary shell adopts a single-surface layer, a transition layer and 5.5 reinforcing layers from inside to outside in sequence; the single surface layer adopts zircon sand, so that no bubbles exist between the coating at the sharp corner and the wax mould, and the phenomena of coating accumulation and the like are avoided; the single-sided layer is manufactured and is not placed in front of the fan; note that the drying speed of the single-sided layer and the transition layer should not be too fast, and the drying time should not exceed the process requirement time; after the transition layer is completely dried, sand filling and hole plugging are carried out on the inner hole of the transition layer by adopting 30-60-mesh mullite sand.
And in the third step, before roasting, sand in the casting cup of the shell is cleaned, is prevented from falling into the shell, and is reversely installed.
The invention has the advantages that the manufacturing method of the invention effectively solves the technical problem that the surface layer sanding material is expensive in the existing silica sol investment casting process, and the quality of the casting is not lower than the level of the surface layer of the original sand shell; the manufacturing method of the track shoe shell improves the quality and the performance of the high manganese steel plate body, and solves the technical problem that white slag is not produced in silica sol investment casting; the casting method of the invention realizes the adjustment of the stress position structure of the track shoe, optimizes the casting process, smelting and heat treatment and improves the use quality of the track shoe.
Detailed Description
The method of manufacturing a high manganese steel track plate shell of the present invention is described in further detail below.
The manufacturing method of the high manganese steel track shoe shell comprises the following specific steps:
firstly, pressing a wax mould. And pressing the wax pattern by using a metal mold. The wax matrix includes wax matrix body and die head. The wax mould body and the mould head are pressed separately at the same time. And 2 wax patterns are pressed simultaneously.
1) When the wax mould is pressed, the wax piece body is not allowed to have the defects of cold shut, pits, convex slip and the like;
2) before repairing the wax mould, checking the center distance of the dead head surface of the wax piece body, carrying out 100% inspection, and removing unqualified products. All bubbles on the wax mould should be broken and repaired by repair wax. Repairing the flow marks on the non-processing surface of the wax mould by using green wax, and paying attention to the fact that the wax mould is not damaged; the wax mould body has a deep flow mark or a cold shut which is not required to be repaired and directly discarded. And blowing the wax scraps by using an air nozzle to clean the repaired wax pattern, and neatly placing the wax pattern in a storage tray.
3) And (3) ironing the smelting furnace number on the plane of the grounding rib of the wax mould by using an ironing device, wherein the heating temperature of the ironing device is 125 +/-5 ℃, and the contact time of the wax mould and the character head of the iron is less than or equal to 3 s. And (3) firmly welding the wax mould body and the mould head, wherein no gap is formed at the welding seam, and 100% of fillet transition is required. The wax drops are strictly prohibited from being formed on the wax pattern, and if the wax drops exist, the wax drops are repaired. And a handle and a cover plate are arranged on the sprue cup of the qualified die head, and no gap is reserved between the cover plate and the sprue cup of the die head after the cover plate is arranged.
In a second step, a primary shell is manufactured.
And (5) manufacturing a primary shell. 2 wax molds are immersed in the silica sol coating to be dipped in the silica sol. After the wax pattern is visually checked to be soaked, the wax pattern is drawn out to check whether the wax pattern is completely wetted, and if the wax pattern cannot be completely wetted, the wax pattern is cleaned again. The next procedure can be switched to, namely, sand spraying is carried out. And then dried (air-dried). And the processes of dipping silica sol, spraying sand and spraying sand are carried out for 5-8 times. The mesh number of the sand is increased layer by layer.
The primary shell adopts a single-face layer, a transition layer and 5.5 reinforcing layers from inside to outside in sequence. The single surface layer adopts zircon sand, ensures that no bubble exists between the coating at the sharp corner and the wax mould, and has no phenomena of coating accumulation and the like. The single-sided layer is finished and should not be placed in front of the fan. Note that the drying speed of the single-sided layer and the transition layer should not be too fast, and the drying time should not exceed the process requirement time, so as to prevent the occurrence of defects such as cracks.
After the transition layer is completely dried, sand is poured into the inner hole of the transition layer by adopting 30-60 meshes mullite sand for hole plugging, and the next layer of operation can be carried out after the transition layer is dried.
And thirdly, manufacturing a shell and roasting. The primary shell was wrapped with rock wool before firing and a first layer of rock wool was wrapped around the die of the primary shell to 2/3 the length of the body of the primary shell to achieve complete surface coverage of the wrapped portion. The specification of rock wool is 500mm multiplied by 280 mm; the second layer of rock wool is wound on the primary shell die head part, namely on the first layer of rock wool at the die head part, and the specification of the rock wool is 500mm multiplied by 130 mm; then bind rock wool 3 times with phi 1.5 iron wire. Realizes the slow cooling of rock wool and solves the problem of shrinkage and loosening of the high manganese steel plate body. Finally, roasting in a roasting furnace, wherein the roasting time is more than 25 minutes, and the roasting temperature is 900-1250 ℃. Before roasting, sand in the casting cup of the shell is cleaned, and the casting cup is prevented from falling into the shell and is inversely installed. After firing, the shell should be rose or white in color.
The casting time is as short as possible when the calcined shell is cast subsequently, so that excessive temperature drop is avoided. The operation speed is increased during pouring, so that molten steel in each furnace is poured as soon as possible, and the molten steel is prevented from being oxidized again.
Claims (5)
1. The manufacturing method of the high manganese steel track shoe shell is characterized by comprising the following steps of: the manufacturing method comprises the following specific steps:
firstly, pressing a wax mould; pressing a wax mould by using a metal mould; the wax mould comprises a wax mould body and a mould head, wherein the wax mould body and the mould head are pressed separately at the same time, and 2 wax moulds are pressed at the same time; checking the center distance of the riser surface of the wax piece body, removing unqualified products, firmly welding the qualified wax mould body with the die head, and installing a handle and a cover plate on a pouring cup of the die head;
second, manufacturing a primary shell; immersing 2 wax molds into the silica sol coating, dipping the silica sol, and then sequentially spraying sand and drying;
thirdly, manufacturing a shell and roasting; winding the primary shell by using rock wool before roasting, wherein the first layer of rock wool is wound on the die head of the primary shell until 2/3 of the length of the primary shell body, and the surface of the wound part is completely wrapped; winding the second layer of rock wool on the primary shell die head part, namely winding the second layer of rock wool on the first layer of rock wool on the die head part, and then binding the rock wool by using iron wires; finally, roasting in a roasting furnace, wherein the roasting time is more than 25 minutes, and the roasting temperature is 900-1250 ℃.
2. The method of manufacturing a high manganese steel track plate shell according to claim 1, wherein: in the first step, 1) when the wax mould is pressed, the wax piece body is not allowed to have the defects of cold shut, pits, convex slip and the like; 2) before repairing the wax mould, checking the center distance of the dead head surface of the wax piece body, performing 100% check, breaking all bubbles on the wax mould, and repairing by using repair wax; repairing the flow marks on the non-processing surface of the wax mould by using green wax, and paying attention to the fact that the wax mould is not damaged; the wax mould body has a deep flow mark or a cold shut which is not required to be repaired and directly scrapped; blowing the wax scraps by using an air nozzle, and neatly placing the wax mould in a storage tray; 3) firmly welding the wax mould body and the mould head, wherein no gap is formed at the welding seam, and 100 percent of fillets are required to be transited; strictly stopping the wax from dropping on the wax mould; no gap is reserved between the rear cover plate of the mounting cover plate and the die head pouring cup.
3. The method of manufacturing a high manganese steel track plate shell according to claim 1, wherein: in the second step, when dipping silica sol, after the wax mould is visually inspected to be soaked, the wax mould is drawn out to check whether the wax mould is completely wetted, if the wax mould cannot be completely wetted, the wax mould is cleaned again; sand spraying and drying can be carried out; the second step is carried out for 5-8 times; the mesh number of the sand is increased layer by layer.
4. A method of manufacturing a high manganese steel track plate shell according to claim 3, wherein: the primary shell adopts a single-surface layer, a transition layer and 5.5 reinforcing layers from inside to outside in sequence; the single surface layer adopts zircon sand, so that no bubbles exist between the coating at the sharp corner and the wax mould, and the phenomena of coating accumulation and the like are avoided; the single-sided layer is manufactured and is not placed in front of the fan; note that the drying speed of the single-sided layer and the transition layer should not be too fast, and the drying time should not exceed the process requirement time; after the transition layer is completely dried, sand filling and hole plugging are carried out on the inner hole of the transition layer by adopting 30-60-mesh mullite sand.
5. The method of manufacturing a high manganese steel track plate shell according to claim 1, wherein: and in the third step, before roasting, sand in the casting cup of the shell is cleaned, is prevented from falling into the shell, and is reversely installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010568948.2A CN111774528A (en) | 2020-06-19 | 2020-06-19 | Manufacturing method of high manganese steel track shoe shell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010568948.2A CN111774528A (en) | 2020-06-19 | 2020-06-19 | Manufacturing method of high manganese steel track shoe shell |
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| Publication Number | Publication Date |
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| CN111774528A true CN111774528A (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010568948.2A Pending CN111774528A (en) | 2020-06-19 | 2020-06-19 | Manufacturing method of high manganese steel track shoe shell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210927A (en) * | 2021-12-31 | 2022-03-22 | 毕普帕罗洛江苏工程技术有限公司 | Shell-layer reinforcing process for inhibiting shell cracking |
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| CN102294435A (en) * | 2011-09-15 | 2011-12-28 | 山东开泰抛丸机械有限公司 | Method for casting and producing shot blasting machine blade based on firing mold on composite shell with utilization of chilled surface layer paint |
| CN104308076A (en) * | 2014-10-29 | 2015-01-28 | 西安航空动力股份有限公司 | Wax mold combination of four-connection hollow turbine guide vane and precision casting method of wax mold combination |
| CN104308082A (en) * | 2014-10-29 | 2015-01-28 | 西安航空动力股份有限公司 | Pouring method of hollow turbine guide vane |
| CN104325081A (en) * | 2014-10-30 | 2015-02-04 | 西安航空动力股份有限公司 | Preparation method of combined type shell with heat insulating materials implanted therein |
| CN109622888A (en) * | 2018-12-20 | 2019-04-16 | 航天海鹰(哈尔滨)钛业有限公司 | A kind of cast shaping process of the multi-joint guide vane casting of complexity high temperature alloy |
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2020
- 2020-06-19 CN CN202010568948.2A patent/CN111774528A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102294435A (en) * | 2011-09-15 | 2011-12-28 | 山东开泰抛丸机械有限公司 | Method for casting and producing shot blasting machine blade based on firing mold on composite shell with utilization of chilled surface layer paint |
| CN104308076A (en) * | 2014-10-29 | 2015-01-28 | 西安航空动力股份有限公司 | Wax mold combination of four-connection hollow turbine guide vane and precision casting method of wax mold combination |
| CN104308082A (en) * | 2014-10-29 | 2015-01-28 | 西安航空动力股份有限公司 | Pouring method of hollow turbine guide vane |
| CN104325081A (en) * | 2014-10-30 | 2015-02-04 | 西安航空动力股份有限公司 | Preparation method of combined type shell with heat insulating materials implanted therein |
| CN109622888A (en) * | 2018-12-20 | 2019-04-16 | 航天海鹰(哈尔滨)钛业有限公司 | A kind of cast shaping process of the multi-joint guide vane casting of complexity high temperature alloy |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210927A (en) * | 2021-12-31 | 2022-03-22 | 毕普帕罗洛江苏工程技术有限公司 | Shell-layer reinforcing process for inhibiting shell cracking |
| CN114210927B (en) * | 2021-12-31 | 2024-06-11 | 毕普帕罗洛江苏工程技术有限公司 | Shell layer reinforcing process for inhibiting shell cracking |
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Application publication date: 20201016 |