CN115555520A - Machine for casting aluminum piston blank by turning 180 degrees and using method - Google Patents
Machine for casting aluminum piston blank by turning 180 degrees and using method Download PDFInfo
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- CN115555520A CN115555520A CN202211366027.3A CN202211366027A CN115555520A CN 115555520 A CN115555520 A CN 115555520A CN 202211366027 A CN202211366027 A CN 202211366027A CN 115555520 A CN115555520 A CN 115555520A
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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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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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
- B22C9/082—Sprues, pouring cups
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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
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/105—Salt cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/106—Vented or reinforced cores
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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
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
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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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/003—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using inert gases
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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
- B22D33/00—Equipment for handling moulds
- B22D33/02—Turning or transposing moulds
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to a machine for casting an aluminum piston blank by turning 180 degrees and a using method thereof, belonging to the technical field of piston casting. The machine includes the frame, the workstation, the backup pad, the gating system, hydraulic motor, hydraulic system and electrical system, wherein, frame top both sides are provided with hydraulic motor, frame top inboard is provided with C type workstation through bull stick and bearing activity, the bull stick is connected with the hydraulic motor output, the workstation upside supports through the stand and is provided with the backup pad, be provided with the gating system between backup pad and the workstation, carry out the piston blank pouring through letting in aluminium liquid in the gating system, hydraulic motor and gating system all are connected to hydraulic system, hydraulic system is connected with electrical system. The piston blank cast by the method has the advantages of fine grain structure and good metallographic structure, air hole and sand hole are avoided, and the mechanical property and the thermal fatigue resistance of the piston blank are improved.
Description
Technical Field
The invention relates to a machine for casting an aluminum piston blank by turning 180 degrees and a using method thereof, belonging to the technical field of piston casting.
Background
Aluminium piston blank pouring machine that mainstream adopted in the existing market includes the machine body, electrical system, hydraulic system and cooling system, machine pouring piston blank is upright structure, the head is last promptly, the skirt portion is under, but thick big benefit throat can appear in cast blank piston head top surface combustion chamber position, hardly realize quick cooling after the shaping, it is thick and thick to form the grain structure like this, the metallographic structure is relatively poor, air pocket sand hole appears easily, the installation back piston will bear the high explosion pressure of high temperature, the metallographic structure is relatively poor and the mechanical properties of piston can be influenced to air pocket sand hole, make its thermal fatigue resistance decline.
Chinese patent document CN112846167a discloses a single-mold casting machine for casting an aluminum piston blank by tilting 90 ° and a method for using the same. The casting machine comprises a frame, a workbench, tilting oil cylinders, a pouring system, a hydraulic system and an electrical system, wherein the workbench is arranged on the frame, the pouring system is arranged on the workbench, aluminum liquid is introduced into the pouring system to pour a piston blank, the tilting oil cylinders are respectively arranged on two sides of the bottom of the frame, the other ends of the tilting oil cylinders are connected to the workbench, the tilting oil cylinders and the pouring system are both connected to the hydraulic system, and the hydraulic system is connected with the electrical system. The casting machine is poured after being tilted by 90 degrees, the feeding port is arranged above, feeding is carried out after pouring is carried out, but tests show that feeding is carried out when pouring is started, so that the mechanical properties, the metallographic structure and other properties of a poured blank can be further improved, and the invention is provided for the purpose.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a machine for casting an aluminum piston blank by turning 180 degrees, the cast piston blank has fine grain structure and good metallographic structure, air hole and sand hole are avoided, and the mechanical property and the thermal fatigue resistance of the piston blank are improved.
The invention also provides a use method of the machine for casting the aluminum piston blank by turning 180 degrees.
The technical scheme of the invention is as follows:
the utility model provides a machine of 180 casting aluminum piston blanks overturns, which comprises a frame, a workbench, a supporting plate, the gating system, hydraulic motor, hydraulic system and electrical system, wherein, frame top both sides are provided with hydraulic motor, frame top inboard is provided with C type workstation through bull stick and bearing activity, the bull stick is connected with the hydraulic motor output, the workstation upside is provided with the backup pad through the stand support, be provided with the gating system between backup pad and the workstation, carry out the piston blank pouring through letting in aluminium liquid in the gating system, hydraulic motor and gating system all are connected to hydraulic system, hydraulic system is connected with electrical system.
Preferably, the pouring system comprises an upper bracket, a side bracket, a lower bracket, an upper tool, a lower tool, a left tool and a right tool, outer mold oil cylinders are arranged on two sides of a workbench respectively, the outer mold oil cylinders are connected to the left tool and the right tool through the side bracket respectively, an inner core oil cylinder is arranged on the lower side of the workbench through the lower bracket, the inner core oil cylinder is connected with the lower tool, a hollowed-out area is arranged on a supporting plate, a fixing plate is arranged in the middle of the hollowed-out area, top mold oil cylinders are fixedly arranged on two sides of the fixing plate, the upper bracket is arranged on the fixing plate through an upper cylindrical guide rail, the two sides of the upper bracket are connected with the top mold oil cylinders, the lower part of the upper cylindrical guide rail is connected with the upper tool, the lower tool, the shape of a pouring cavity formed by closing the left tool and the right tool is a piston shape, and the outer mold oil cylinders, the top mold oil cylinders and the inner core oil cylinders are connected to the hydraulic system. The upper tool is controlled to move through 2 top die oil cylinders, the pressing force is strong after 180-degree turnover, and the sealing performance is guaranteed.
Preferably, the workbench on the two sides of the left tool and the right tool is provided with a square guide rail, the left tool and the right tool stretch along the square guide rail, the direction is fixed, and the stretching process is guaranteed not to deviate in the direction.
Preferably, be provided with the salt core bracing piece on the lower frock, support the salt core through the salt core bracing piece, avoid the salt core to take place the skew when moving along with the gating system, be provided with the getter device in the frame, the getter device is connected to the salt core bracing piece, absorbs the gas that the salt core was heated and produces through the getter device, reduces the porosity of piston blank.
Preferably, the workbench is fixedly provided with a positioning disc, the lower tool penetrates through the positioning disc, the upper tool, the left tool and the right tool are respectively attached to the positioning disc, the positions of the upper tool, the lower tool, the left tool and the right tool are corrected through the positioning disc, the position is guaranteed to be accurate, the product quality is improved, positioning pins are respectively arranged on the inner side and the outer side of the positioning disc, the inner side positioning pin is matched with the fixed lower tool, and the outer side positioning pin is matched with the fixed left tool and the right tool.
Preferably, the upper tool, the lower tool, the left tool and the right tool are respectively internally provided with a cooling water channel, the cooling water channel is connected with a cooling water tank through a booster pump, a flow sensor and an electromagnetic valve are arranged on a pipeline between the cooling water channel and the booster pump, the flow and time of cooling water is controlled, and uniform cooling of each part is guaranteed.
Preferably, a pouring gate with a downward pouring gate is correspondingly arranged on one side of each of the left tool and the right tool, a filter screen placing groove is formed in the tail end of the pouring gate of the left tool, a filter screen is arranged in the groove during use, a riser is arranged on one side in the pouring cavity, and the riser and the pouring gate are symmetrical in position when entering the pouring cavity.
Preferably, the bottom surface of the upper tool is provided with an annular boss, and the joint of the top surfaces of the left tool and the right tool is provided with an annular groove.
Preferably, the right tool is connected with an inert gas storage tank, after all the tools are closed, a blank-shaped pouring cavity is formed inside the right tool, inert gas is introduced into the pouring cavity to expel air inside the pouring cavity, and then aluminum liquid is poured, so that the oxidation degree of the aluminum liquid can be reduced, and the blank performance is ensured.
The use method of the machine for casting the aluminum piston blank by turning 180 degrees comprises the following steps:
(1) Turning on an electrical system, driving the casting machine to work by a hydraulic system, enabling the lower tool to move upwards and penetrate through the positioning disc, enabling the top of the lower tool to be exposed out of the positioning disc upwards, and arranging a salt core on the salt core supporting rod;
(2) The left tool and the right tool move towards the positioning disc until the positioning disc is attached, and the left tool and the right tool are closed;
(3) The upper tool moves downwards, is pressed on the left tool and the right tool and is integrally closed to form a closed pouring cavity, the inert gas storage tank is opened, inert gas is introduced into the pouring cavity, and the inert gas storage tank is closed after 30 seconds;
(4) The hydraulic motor rotates to drive the workbench and the pouring system to turn over for 180 degrees, at the moment, the pouring gate is upward, and aluminum liquid is poured through the pouring gate;
(5) The aluminum liquid firstly enters the height position of a riser of the pouring cavity through a pouring gate, and then is filled upwards in the pouring cavity until the pouring cavity is filled;
(6) After pouring, the hydraulic motor rotates, the workbench and the pouring system reset, then the upper tool, the left tool, the right tool and the lower tool reset in sequence, and the blank is taken out and placed in a water tank for cooling.
The invention has the beneficial effects that:
1. the piston blank is rotated by 180 degrees to cast the piston blank, the aluminum liquid is subjected to inertia casting under the action of gravity, the piston blank is filled in the casting cavity from bottom to top, the position of the riser is cast first, the riser can be ensured to be fed to the aluminum liquid on the upper side all the time in the subsequent whole blank casting process, air holes are prevented from being generated due to air gaps, the cast piston blank has a finer grain structure and a better metallographic structure compared with the traditional upright casting and 90-degree tilting casting, and the mechanical property and the thermal fatigue resistance of the piston blank are improved.
2. The air suction device is connected to the salt core supporting rod, and air generated by heating of the salt core is absorbed by the air suction device, so that the porosity of the piston blank is reduced.
3. The right tool is connected with an inert gas storage tank, after all the tools are closed, a blank-shaped pouring cavity is formed inside the tools, inert gas is introduced into the pouring cavity to drive away air inside the pouring cavity, and then aluminum liquid is poured, so that the oxidation degree of the aluminum liquid can be reduced, and the blank performance is ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the gating system of the present invention;
FIG. 3 is a schematic view of a puck structure of the present invention;
FIG. 4 is a schematic view of the structural state of the pouring cavity of the present invention;
wherein: 1. a frame; 2. a work table; 3. an upper bracket; 4. a side bracket; 5. a lower bracket; 6. a hydraulic motor; 7. an outer mold oil cylinder; 8. a top die oil cylinder; 9. positioning a plate; 10. a hydraulic system; 11. an electrical system; 12. an inner core oil cylinder; 13. a suction device; 14. a left tool; 15. a right tool; 16. assembling a tool; 17. a lower tool; 18. a salt core support rod; 19. a riser; 20. a salt core; 21. a filter screen placing groove; 22. positioning pins; 23. a pouring channel; 24. a groove; 25. a rotating rod; 26. a support plate; 27. a fixing plate; 28. a boss; 29. a cooling water tank; 30. a quenching water tank.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1-4, the present embodiment provides a machine for casting an aluminum piston blank by turning 180 °, including a frame 1, a workbench 2, a supporting plate 26, a pouring system, a hydraulic motor, a hydraulic system 10 and an electrical system 11, wherein, hydraulic motors 6 are disposed on two sides of the top of the frame 1, a C-shaped workbench 2 is movably disposed on the inner side of the top of the frame 1 through a rotating rod 25 and a bearing, the rotating rod 25 is connected with an output end of the hydraulic motor 6, the supporting plate 26 is disposed on the upper side of the workbench 2 through a column support, the pouring system is disposed between the supporting plate 26 and the workbench 2, the piston blank is poured by introducing aluminum liquid into the pouring system, the hydraulic motors and the pouring system are both connected to the hydraulic system, and the hydraulic system is connected with the electrical system.
The pouring system comprises an upper bracket 3, side brackets 4, a lower bracket 5, an upper tool 16, a lower tool 17, a left tool 14 and a right tool 15, outer mold cylinders 7 are arranged on two sides of a workbench 2 respectively, the outer mold cylinders 7 are connected to the left tool 14 and the right tool 15 through the side brackets 4 respectively, an inner core cylinder 12 is arranged on the lower side of the workbench 2 through the lower bracket 5, the inner core cylinder 12 is connected with the lower tool 17, a hollowed-out area is arranged on a supporting plate 26, a fixing plate 27 is arranged in the middle of the hollowed-out area, top mold cylinders 8 are fixedly arranged on two sides of the fixing plate 27, the upper bracket 3 is arranged on the fixing plate 27 through an upper cylindrical guide rail, top mold cylinders are connected to two sides of the upper bracket 3, the upper tool 16 is connected to the lower portion of the upper cylindrical guide rail, the shapes of pouring cavities after the upper tool 16, the lower tool 17, the left tool 14 and the right tool 15 are closed are piston shapes, and the outer mold cylinders, the top mold cylinders and the inner core cylinders are connected to a hydraulic system. The upper tool is controlled to move through 2 top die oil cylinders, the pressing force is strong after 180-degree turnover, and the sealing performance is guaranteed.
Be provided with salt core bracing piece 18 on the frock 17 down, support salt core 20 through salt core bracing piece 18, avoid the salt core to take place the skew when moving along with the gating system, be provided with getter device 13 in the frame, getter device 13 is connected to salt core bracing piece 18, absorbs the gas that the salt core was heated and produces through getter device, reduces the porosity of piston blank.
A pouring gate 23 with a downward pouring gate is correspondingly arranged on one side of each of the left tool 14 and the right tool 15, a filter screen placing groove 21 is formed in the tail end of the pouring gate of the left tool 14, a filter screen is arranged in the groove during use, a riser 19 is arranged on one side in a pouring cavity, and the riser 19 and the pouring gate 23 are symmetrical in position of entering the pouring cavity.
The bottom surface of the upper tool 16 is provided with an annular boss 28, the joint of the top surfaces of the left tool 14 and the right tool 15 is provided with an annular groove 24, and when the tool is used, the annular boss is pressed into the annular groove to realize sealing.
The right tool is connected with an inert gas storage tank, after all the tools are closed, a blank-shaped pouring cavity is formed inside the right tool, inert gas is introduced into the pouring cavity to expel air inside the pouring cavity, and then aluminum liquid is poured, so that the oxidation degree of the aluminum liquid can be reduced, and the blank performance is ensured.
The use method of the machine for casting the aluminum piston blank by turning 180 degrees comprises the following steps:
(1) Opening an electrical system, driving a casting machine to work by a hydraulic system, enabling a lower tool to move upwards and penetrate through a positioning disc, enabling the top of the lower tool to be exposed out of the positioning disc upwards, and arranging a salt core on a salt core supporting rod;
(2) The left tool and the right tool move towards the positioning disc until the positioning disc is attached, and the left tool and the right tool are closed;
(3) The upper tool moves downwards, is pressed on the left tool and the right tool and is integrally closed to form a closed pouring cavity, the inert gas storage tank is opened, inert gas is introduced into the pouring cavity, and the inert gas storage tank is closed after 30 seconds;
(4) The hydraulic motor rotates to drive the workbench and the pouring system to turn over for 180 degrees, at the moment, the pouring gate is upward, and aluminum liquid is poured through the pouring gate;
(5) The aluminum liquid firstly enters the height position of a riser of the pouring cavity through a pouring gate, and then is filled upwards in the pouring cavity until the pouring cavity is filled;
(6) After the pouring is finished, the hydraulic motor rotates, the workbench and the pouring system reset, then the upper tool, the left tool, the right tool and the lower tool reset in sequence, and the blank is taken out by a mechanical arm or a manual work and placed in the quenching water tank 30 for cooling.
Example 2:
the utility model provides a machine of 180 casting aluminum piston blanks overturns, the structure is as embodiment 1, the difference lies in, is provided with square guide rail on the workstation 2 of left frock 14 and right frock 15 both sides, and left frock and right frock are flexible along square guide rail, and the direction is fixed, guarantees that flexible process can not take place the direction skew.
Example 3:
the utility model provides a machine of 180 casting aluminum piston blanks overturns, the structure is as embodiment 1, the difference lies in, goes up frock, left frock and right frock is inside to be provided with the cooling water course respectively down, and the cooling water course is connected with coolant tank 29 through the booster pump, is provided with flow sensor and solenoid valve on the pipeline between cooling water course and the booster pump, controls the flow and the time of letting in the cooling water, guarantees that every position cooling is even.
Claims (10)
1. The utility model provides a machine of 180 casting aluminum piston blanks overturns, a serial communication port, which comprises a frame, a workbench, a supporting plate, the gating system, hydraulic motor, hydraulic system and electrical system, wherein, frame top both sides are provided with hydraulic motor, frame top inboard is provided with C type workstation through the bull stick activity, the bull stick is connected with the hydraulic motor output, the workstation upside is provided with the backup pad through the stand support, be provided with the gating system between backup pad and the workstation, carry out the piston blank pouring through letting in aluminium liquid in the gating system, hydraulic motor and gating system all are connected to hydraulic system, hydraulic system is connected with electrical system.
2. The machine for casting an aluminum piston blank by overturning 180 degrees as claimed in claim 1, wherein the casting system comprises an upper bracket, a side bracket, a lower bracket, an upper tool, a lower tool, a left tool and a right tool, outer mold cylinders are respectively arranged on two sides of the workbench, the outer mold cylinders are respectively connected to the left tool and the right tool through the side bracket, an inner core cylinder is arranged on the lower side of the workbench through the lower bracket, the inner core cylinder is connected with the lower tool, a hollow area is arranged on the support plate, a fixing plate is arranged in the middle of the hollow area, top mold cylinders are fixedly arranged on two sides of the fixing plate, an upper bracket is arranged on the fixing plate through an upper cylindrical guide rail, top mold cylinders are connected on two sides of the upper bracket, the upper tool is connected to the lower cylindrical guide rail, the shape of the casting cavity after the upper tool, the lower tool, the left tool and the right tool are closed is a piston shape, and the outer mold cylinders, the top mold cylinders and the inner core cylinders are all connected to the hydraulic system.
3. A machine for 180 ° turn casting of aluminum piston blanks as claimed in claim 2, wherein square guide rails are provided on the tables on both sides of the left and right tooling.
4. A machine for 180 ° turn casting of aluminum piston blanks as claimed in claim 2, wherein the lower tooling is provided with a salt core support rod and the frame is provided with a suction device connected to the salt core support rod.
5. The machine for casting the aluminum piston blank by overturning 180 degrees as claimed in claim 4, wherein a positioning disc is fixedly arranged on the workbench, the lower tool penetrates through the positioning disc, the upper tool, the left tool and the right tool are respectively attached to the positioning disc, positioning pins are respectively arranged on the inner side and the outer side of the positioning disc, the inner side positioning pin is matched and fixed with the lower tool, and the outer side positioning pin is matched and fixed with the left tool and the right tool.
6. The machine for casting an aluminum piston blank by turning 180 degrees as claimed in claim 5, wherein the upper tool, the lower tool, the left tool and the right tool are respectively provided with a cooling water channel inside, the cooling water channels are connected with a cooling water tank through a booster pump, and a flow sensor and an electromagnetic valve are arranged on a pipeline between the cooling water channel and the booster pump.
7. The machine for 180 ° turnover casting of aluminum piston blanks as recited in claim 6, wherein each of the left and right tooling has a corresponding runner with a downward gate, the end of the runner of the left tooling has a filter screen receiving slot, and a riser is disposed at one side of the casting cavity, the riser being symmetrical to the position of the runner into the casting cavity.
8. The machine for casting an aluminum piston blank by turning 180 degrees as claimed in claim 7, wherein the bottom surface of the upper tool is provided with an annular boss, and the joint of the top surfaces of the left tool and the right tool is provided with an annular groove.
9. A machine for 180 ° turnover casting of aluminum piston blanks as recited in claim 8, wherein the right tooling is connected to an inert gas reservoir.
10. A method of using the machine for 180 ° turn casting of aluminum piston blanks as recited in claim 9, characterized by the steps of:
(1) Opening an electrical system, driving a casting machine to work by a hydraulic system, enabling a lower tool to move upwards and penetrate through a positioning disc, enabling the top of the lower tool to be exposed out of the positioning disc upwards, and arranging a salt core on a salt core supporting rod;
(2) The left tool and the right tool move towards the positioning disc until the positioning disc is attached, and the left tool and the right tool are closed;
(3) The upper tool moves downwards, is pressed on the left tool and the right tool and is integrally closed to form a closed pouring cavity, the inert gas storage tank is opened, inert gas is introduced into the pouring cavity, and the inert gas storage tank is closed after 30 seconds;
(4) The hydraulic motor rotates to drive the workbench and the pouring system to turn over for 180 degrees, at the moment, the pouring gate is upward, and aluminum liquid is poured through the pouring gate;
(5) The aluminum liquid firstly enters the height position of a dead head of the casting cavity through a pouring gate, and then is filled upwards in the casting cavity until the casting cavity is filled;
(6) After the pouring is finished, the hydraulic motor rotates, the workbench and the pouring system reset, then the upper tool, the left tool, the right tool and the lower tool reset in sequence, and the blank is taken out and placed in a water tank for cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211366027.3A CN115555520A (en) | 2022-10-31 | 2022-10-31 | Machine for casting aluminum piston blank by turning 180 degrees and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211366027.3A CN115555520A (en) | 2022-10-31 | 2022-10-31 | Machine for casting aluminum piston blank by turning 180 degrees and using method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115555520A true CN115555520A (en) | 2023-01-03 |
Family
ID=84768026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211366027.3A Pending CN115555520A (en) | 2022-10-31 | 2022-10-31 | Machine for casting aluminum piston blank by turning 180 degrees and using method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115555520A (en) |
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2022
- 2022-10-31 CN CN202211366027.3A patent/CN115555520A/en active Pending
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