CN209918854U - Forming die for manufacturing hydraulic shaft core of gear box - Google Patents
Forming die for manufacturing hydraulic shaft core of gear box Download PDFInfo
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- CN209918854U CN209918854U CN201920580475.0U CN201920580475U CN209918854U CN 209918854 U CN209918854 U CN 209918854U CN 201920580475 U CN201920580475 U CN 201920580475U CN 209918854 U CN209918854 U CN 209918854U
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- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 238000005266 casting Methods 0.000 claims description 17
- 239000002893 slag Substances 0.000 claims description 10
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 abstract description 5
- 238000004512 die casting Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005242 forging Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a be used for preparing gear box hydraulic pressure axle core forming die belongs to mechanical technical field, include: the upper die is provided with a pouring port and an upper die cavity communicated with the pouring port, wherein two upper die cores are embedded in the upper die cavity side by side, and two liquid passing channels are respectively arranged between the pouring port and the two upper die cores; the core pulling mechanism comprises a first core pulling component and a second core pulling component which are connected to the upper die in a sliding mode, and the first core pulling component and the second core pulling component are arranged oppositely; the lower die is provided with a lower cavity, the position of the lower cavity corresponds to that of the upper cavity, and two lower die cores corresponding to the positions of the upper die cores are embedded in the lower cavity; and the ejection mechanism is connected with the lower die, wherein one end of the ejection mechanism enters the lower die core through the lower cavity of the lower die. The utility model relates to a be used for preparing gear box hydraulic pressure axle core forming die, quantity when the product shaping reaches to two, has improved work efficiency.
Description
Technical Field
The utility model belongs to the technical field of die-casting machine, a forming die is related to, especially one kind is used for preparing gear box hydraulic pressure axle core forming die.
Background
Die casting (i.e., pressure casting) is a casting method in which a molten or semi-molten metal is filled into an upper cavity of a mold at a high pressure and a high speed, and solidified and formed at a high pressure to obtain a cast product, and is one of the most advanced metal forming methods. Die casting is performed in a die casting mold, which is a method for casting liquid die forging, a process that is performed on a dedicated die casting die forging machine.
The production yield and the quantity of the die-casting die are about eight percent of the total production of various dies in China, and are only inferior to those of a stamping die and a plastic die. Under the rapid development environment of international economy, the bases and centers of the international die-casting industry and the foundry industry are gradually shifted to China, China becomes a world die-casting big country, and the development and forming space in the future is large. As a processing base of the basic industry of the world mechanical industry, particularly a die casting processing base, China brings great development opportunities to domestic die casting manufacturers, and simultaneously stimulates the quality improvement of basic products in China and requires the quality and performance of mechanical equipment to be synchronously followed.
However, the existing die-casting die basically has only one product formed at one time, and the working efficiency is low.
To sum up, for solving the structural not enough of present gear box hydraulic pressure axle core forming die that is used for preparing, need design one kind and can increase the quantity of single shaping product, improve work efficiency's forming die.
SUMMERY OF THE UTILITY MODEL
The utility model aims at having the above-mentioned problem to current technique, provide one kind and can increase the quantity of single shaping product, improve work efficiency's forming die.
The purpose of the utility model can be realized by the following technical proposal: a be used for preparing gear box hydraulic pressure axle core forming die includes: the upper die is provided with a pouring port and an upper die cavity communicated with the pouring port, wherein two upper die cores are embedded in the upper die cavity side by side, and two liquid passing channels are respectively arranged between the pouring port and the two upper die cores; the core pulling mechanism comprises a first core pulling component and a second core pulling component which are connected to the upper die in a sliding mode, and the first core pulling component and the second core pulling component are arranged oppositely; the lower die is provided with a lower cavity, the position of the lower cavity corresponds to that of the upper cavity, and two lower die cores corresponding to the positions of the upper die cores are embedded in the lower cavity; and the ejection mechanism is connected with the lower die, wherein one end of the ejection mechanism enters the lower die core through the lower cavity of the lower die.
In the above forming die for manufacturing the hydraulic shaft core of the gear box, the upper cavity is arranged in a square structure, and each corner of the upper cavity is provided with a convex oblique angle.
In the above forming die for manufacturing the hydraulic shaft core of the gear box, the pouring gate is provided with a stepped hollow pouring sleeve, the pouring sleeve at the end with the larger caliber is nested with the upper die, and the pouring sleeve at the end with the smaller caliber is provided with a notch, wherein the two notches are respectively communicated with the two liquid flowing channels.
In the above-mentioned one kind is used for preparing gear box hydraulic pressure axle core forming die, two walk the liquid passageway and be the zigzag structure setting.
In the forming die for preparing the hydraulic shaft core of the gear box, the connecting part of each liquid flowing channel and the die core is branched to form two branches, and two ends of each branch are respectively communicated with two ends of the die core.
In the above forming die for manufacturing the hydraulic shaft core of the gear box, two of the upper cavities are respectively provided with a step, and two of each step are respectively provided with a slide block, wherein the core pulling blocks in the two groups of core pulling assemblies are embedded in the corresponding steps, and two sides of the core pulling blocks are respectively in sliding connection with the corresponding slide blocks.
In the above forming die for manufacturing the hydraulic shaft core of the gear box, one side of each step, which is far away from the upper cavity, is an inclined plane, and the inclined plane is matched with the inclined plane on the corresponding core-pulling block.
In the above forming die for manufacturing the hydraulic shaft core of the gearbox, the first core pulling assembly comprises a first support arranged on the lower die, and a first cylinder is arranged on the first support, wherein a piston rod of the first cylinder penetrates through the first support and is connected to the first core pulling block.
In the forming die for manufacturing the hydraulic shaft core of the gear box, the first core pulling block comprises a first moving block connected with a first cylinder piston rod and two first core blocks connected with the first moving block, wherein the two first core blocks are connected to the first moving block side by side, and the positions of the two first core blocks correspond to the positions of the two mold cores.
In the above forming die for manufacturing the hydraulic shaft core of the gearbox, the second core pulling assembly comprises a second support arranged on the lower die, and a second cylinder is arranged on the second support, wherein a piston rod of the second cylinder penetrates through the second support and is connected to the second core pulling block.
In the above forming die for manufacturing the hydraulic shaft core of the gear box, the second core pulling block comprises a second moving block connected with a second cylinder piston rod and a second core block connected with the second moving block, wherein the second core block is arranged in a U-shaped structure, two grooves are respectively arranged on two sides of an opening end of the second core block, and each groove corresponds to each branch of the end part of the liquid flowing channel.
In the above forming die for manufacturing the hydraulic shaft core of the gear box, two positioning blocks are arranged on the second core block side by side, and one opposite sides of the two positioning blocks are arc-shaped, wherein the arc is matched with the outer contour of the casting sleeve, one side of each positioning block is provided with a strip groove, and two ends of each strip groove are respectively communicated with the notch on the casting sleeve and the groove on the second core block.
In the forming die for manufacturing the hydraulic shaft core of the gear box, a positioning column and a positioning sleeve nested with the positioning column are arranged on each corner of the upper die and the lower die.
In the above forming die for manufacturing the hydraulic shaft core of the gear box, a plurality of slag ladle cavities and exhaust channels communicated with the slag ladle cavities are arranged around the lower die core, wherein each exhaust channel is arranged along the horizontal transverse line direction, the horizontal longitudinal line direction or the horizontal oblique line direction of the lower die core and penetrates through the edge of the lower die core.
In the forming die for preparing the hydraulic shaft core of the gear box, the ejection mechanism comprises die feet which are respectively connected with two sides of the lower die, and a top plate is arranged between the two die feet, wherein a plurality of support columns and a plurality of ejector rods are arranged between the top plate and the lower die, the positions of one part of the ejector rods correspond to the positions of the slag ladle cavity, and the positions of the other part of the ejector rods correspond to the positions of the lower die core.
Compared with the prior art, the utility model provides a pair of be used for preparing gear box hydraulic pressure axle core forming die inlays respectively on last mould and lower mould and is equipped with two last mold cores and the lower mold core that sets up side by side for quantity when the product shaping reaches to two, thereby improves the work efficiency of work.
Drawings
Fig. 1 is a schematic structural diagram of the utility model relates to a be used for preparing gear box hydraulic pressure axle core forming die.
Fig. 2 is a schematic structural view of an upper mold according to a preferred embodiment of the present invention.
Fig. 3 is a schematic partial structure diagram of an upper mold according to a preferred embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an upper mold and a core-pulling mechanism according to a preferred embodiment of the present invention.
Fig. 5 is a schematic structural diagram of the lower mold, the ejection mechanism and the core-pulling mechanism in a preferred embodiment of the present invention.
Fig. 6 is a schematic structural view of the lower mold, the ejection mechanism, and the core-pulling mechanism in another view according to a preferred embodiment of the present invention.
Fig. 7 is a partially enlarged view of a portion a in fig. 5.
Fig. 8 is a schematic partial structure view of a lower mold according to a preferred embodiment of the present invention.
In the figure, 100, the upper die; 110. a pouring gate; 120. an upper cavity; 130. an upper mold core; 140. a liquid-running channel; 150. oblique angle; 160. pouring a sleeve; 161. a notch; 170. a step; 180. a slider; 190. a bevel; 200. a first core pulling assembly; 210. a first bracket; 220. a first cylinder; 230. a first core extraction block; 231. a first moving block; 232. a first core block; 300. a second core pulling assembly; 310. a second bracket; 320. a second cylinder; 330. a second core extracting block; 331. a second moving block; 332. a second core block; 333. a groove; 340. positioning blocks; 341. a strip groove; 400. a lower die; 410. a lower cavity; 420. a lower mold core; 430. a slag ladle cavity; 440. an exhaust passage; 500. an ejection mechanism; 510. a mould leg; 520. a top plate; 530. a support pillar; 600. a positioning column; 700 position sleeve.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 8, the utility model provides a pair of be used for preparing gear box hydraulic pressure axle core forming die, include: the mold comprises an upper mold 100, a lower mold 100 and a mold core, wherein the upper mold 100 is provided with a sprue gate 110 and an upper cavity 120 communicated with the sprue gate 110, two upper mold cores 130 are embedded in the upper cavity 120 side by side, and two liquid passing channels 140 are respectively arranged between the sprue gate 110 and the two upper mold cores 130; the core pulling mechanism comprises a first core pulling assembly 200 and a second core pulling assembly 300 which are connected to the upper die 100 in a sliding manner, and the first core pulling assembly 200 and the second core pulling assembly 300 are arranged oppositely; a lower die 400, on which a lower cavity 410 is opened, and the position of the lower cavity 410 corresponds to the position of the upper cavity 120, wherein two lower die cores 420 corresponding to the positions of the upper die cores 130 are embedded in the lower cavity 410; and an ejection mechanism 500 connected to the lower mold 400, wherein one end of the ejection mechanism 500 enters the lower mold core 420 through the lower cavity 410 of the lower mold 400.
The utility model provides a pair of be used for preparing gear box hydraulic pressure axle core forming die inlays respectively on last mould 100 and lower mould 400 and is equipped with two last mold core 130 and lower mold core 420 that set up side by side for quantity when the product shaping reaches to two, thereby improves the work efficiency of work.
It is further preferred that the upper cavity 120 is formed in a square structure, and a convex bevel 150 is formed at each corner of the upper cavity 120, so that the upper mold core 130 can be easily assembled and disassembled.
Further preferably, a stepped hollow casting sleeve 160 is disposed on the casting opening 110, the casting sleeve 160 at the end with the larger caliber is embedded in the upper mold 100, and a notch 161 is disposed on the casting sleeve 160 at the end with the smaller caliber, wherein the two notches 161 are respectively communicated with the two liquid-feeding channels 140. When the liquid flows into the casting sleeve 160, the liquid can enter the corresponding liquid-flowing channels 140 along the two notches 161 of the casting sleeve 160, and then enter the corresponding upper mold core 130 and the lower mold core 420.
Further preferably, the two notches 161 have the same opening degree, so that the same flow rate per unit time when the liquid flows through the two notches 161 is ensured, the liquid can synchronously flow into the upper mold core 130 and the lower mold core 420, and the yield of the product during molding is further improved.
Further preferably, the two liquid channels 140 are arranged in a zigzag structure, so that the speed of liquid flowing from the notch 161 to the mold core is reduced, the phenomenon that the liquid is mixed with redundant gas in the flowing process is reduced, a large number of air holes are prevented from being generated after the product is molded, and the strength and the qualified rate of the product after the product is molded are improved.
Further preferably, the joint of each liquid channel 140 and the mold core is branched to form two branches, and two ends of each branch are respectively communicated with two ends of the mold core, so that the molding time of the product is further shortened, and the labor productivity is improved.
Preferably, as shown in fig. 1 to 8, two of the upper cavities 120 are respectively provided with one step 170, and two of each step 170 are respectively provided with one sliding block 180, wherein the core back blocks of the two sets of core back assemblies are embedded in the corresponding steps 170, and two sides of the core back blocks are respectively in sliding contact with the corresponding sliding blocks 180. And the product molding and the product demoulding are realized through the horizontal movement of the two core-pulling blocks.
It is further preferred that the side of each step 170 remote from the upper cavity 120 is provided with a ramp 190 that cooperates with a ramp 190 on the corresponding core block. The fit between the inclined surface 190 on the step 170 and the inclined surface 190 on the core block may form a "wedge-shaped structure" to improve the reliability of the core block during movement.
Preferably, as shown in fig. 1 to 8, the first core back assembly 200 includes a first bracket 210 mounted on the lower mold 400, and a first cylinder 220 is mounted on the first bracket 210, wherein a piston rod of the first cylinder 220 penetrates through the first bracket 210 and is connected to the first core back block 230. The sliding movement between the first core block 230 and the corresponding slide block 180 is pulled or pushed by the first cylinder 220.
Further preferably, the first core block 230 includes a first moving block 231 connected to a piston rod of the first cylinder 220, and two first core blocks 232 connected to the first moving block 231, wherein the two first core blocks 232 are connected to the first moving block 231 side by side, and the positions of the two first core blocks 232 correspond to the positions of the two mold cores.
Preferably, as shown in fig. 1 to 8, the second core back assembly 300 includes a second frame 310 mounted on the lower mold 400, and a second cylinder 320 is mounted on the second frame 310, wherein a piston rod of the second cylinder 320 penetrates through the second frame 310 and is connected to the second core back block 330. The second cylinder 320 pulls or pushes the sliding between the second core back block 330 and the corresponding slide block 180.
Further preferably, the second core block 330 includes a second moving block 331 connected to the piston rod of the second cylinder 320, and a second core block 332 connected to the second moving block 331, wherein the second core block 332 is configured in a U-shaped structure, and two grooves 333 are respectively disposed on two sides of an open end of the second core block 332, and each groove 333 corresponds to each branch at the end of the fluid-carrying channel 140.
Further preferably, two positioning blocks 340 are arranged on the second core block 332 side by side, and one opposite sides of the two positioning blocks 340 are arc-shaped, wherein the arc is matched with the outer contour of the casting sleeve 160, one side of each positioning block 340 is provided with a strip groove 341, and two ends of each strip groove 341 are respectively communicated with the notch 161 on the casting sleeve 160 and the groove 333 on the second core block 332. So that the liquid in the casting sleeve 160 flows into the liquid-flowing channel 140 through the notch 161 on the casting sleeve 160, the groove 341 on the positioning block 340 and the groove 333 on the second core block 332, and then flows into the mold core, thereby completing the molding of the product.
Preferably, as shown in fig. 1 to 8, a positioning column 600 and a positioning sleeve 700 nested with the positioning column 600 are provided at each corner of the upper mold 100 and the lower mold 400. Through reference column 600 and position sleeve 700, guarantee to go up the straightness that hangs down of mould 100 in the process of reciprocating, improve the smooth and easy nature of mould when compound die and drawing of patterns.
Preferably, as shown in fig. 1 to 8, a plurality of slag ladle chambers 430 and exhaust passages 440 communicated with the slag ladle chambers 430 are provided around the lower mold core 420, wherein each exhaust passage 440 is provided along a horizontal transverse line direction, a horizontal longitudinal line direction, or a horizontal oblique line direction of the lower mold core 420 and penetrates the edge of the lower mold core 420.
When the upper die 100 and the lower die 400 are assembled, the upper die core 130 and the lower die core 420 are correspondingly assembled, so that a large amount of gas exists in a forming space for filling liquid in the upper die core 130 and the lower die core 420, when the liquid flows into the forming space, the gas in the forming space is extruded outwards, if the exhaust channel 440 is not arranged, the explosion phenomenon is caused due to the fact that the gas is discharged everywhere, and the safety of the motor housing during forming is improved through the exhaust channel 440.
In addition, because the exhaust channel 440 is communicated with the molding space filled with liquid in the lower mold core 420, in order to fully fill the whole mold core with liquid, the inflow amount of the liquid is generally slightly larger than the filling amount of the molding space in the mold core, and the excessive liquid filled with the mold core overflows into the slag ladle cavity 430, and because the feeding amount is strictly controlled, the amount of the liquid overflowing into the slag ladle cavity 430 is less, so that the whole slag ladle cavity 430 is not completely filled, and the exhaust channel 440 is ensured to be always in a smooth state.
Preferably, as shown in fig. 1 to 8, the ejection mechanism 500 includes mold legs 510 respectively connected to both sides of the lower mold 400, and a top plate 520 is disposed between the two mold legs 510, wherein a plurality of support columns 530 and a plurality of lift rods 540 are disposed between the top plate 520 and the lower mold 400, and a portion of the lift rods 540 correspond to the position of the ladle chamber 430, and another portion of the lift rods 540 correspond to the position of the lower mold core 420. The product is demoulded.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The utility model provides a be used for preparing gear box hydraulic pressure axle core forming die which characterized in that includes: the upper die is provided with a pouring port and an upper die cavity communicated with the pouring port, wherein two upper die cores are embedded in the upper die cavity side by side, and two liquid passing channels are respectively arranged between the pouring port and the two upper die cores; the core pulling mechanism comprises a first core pulling component and a second core pulling component which are connected to the upper die in a sliding mode, and the first core pulling component and the second core pulling component are arranged oppositely; the lower die is provided with a lower cavity, the position of the lower cavity corresponds to that of the upper cavity, and two lower die cores corresponding to the positions of the upper die cores are embedded in the lower cavity; and the ejection mechanism is connected with the lower die, wherein one end of the ejection mechanism enters the lower die core through the lower cavity of the lower die.
2. The forming die of claim 1, wherein the pouring port is provided with a hollow pouring sleeve having a step shape, the pouring sleeve at the end with a larger diameter is nested with the upper die, and the pouring sleeve at the end with a smaller diameter is provided with a notch, wherein the two notches are respectively communicated with the two liquid channels.
3. The forming die for preparing the hydraulic shaft core of the gear box as claimed in claim 2, wherein each branch is formed at the joint of each liquid flowing channel and the mold core, two branches are formed, and two ends of each branch are respectively communicated with two ends of the mold core.
4. The forming mold for preparing the hydraulic shaft core of the gear box according to claim 1, wherein two steps are respectively arranged on two upper cavities, and a sliding block is respectively arranged on two of each step, wherein the core-pulling blocks of the two sets of core-pulling assemblies are embedded in the corresponding steps, two sides of each core-pulling block are respectively in sliding connection with the corresponding sliding block, and one side of each step, which is far away from the upper cavity, is provided with an inclined surface which is matched with the inclined surface on the corresponding core-pulling block.
5. The forming die for preparing the hydraulic shaft core of the gearbox as claimed in claim 1, wherein the first core-pulling assembly comprises a first bracket mounted on the lower die, and a first cylinder is mounted on the first bracket, wherein a piston rod of the first cylinder penetrates through the first bracket and is connected to the first core-pulling block.
6. The forming die for preparing the hydraulic shaft core of the gear box is characterized in that the first core pulling block comprises a first moving block connected with a first cylinder piston rod and two first core blocks connected with the first moving block, wherein the two first core blocks are connected to the first moving block side by side, and the positions of the two first core blocks correspond to the positions of the two mold cores.
7. The forming die for preparing the hydraulic shaft core of the gearbox according to claim 1, wherein the second core pulling assembly comprises a second bracket mounted on the lower die, and a second air cylinder is mounted on the second bracket, wherein a piston rod of the second air cylinder penetrates through the second bracket and is connected to the second core pulling block.
8. The forming die for manufacturing the hydraulic shaft core of the gear box according to claim 7, wherein the second core pulling block comprises a second moving block connected with a second cylinder piston rod and a second core block connected with the second moving block, wherein the second core block is arranged in a U-shaped structure, two grooves are respectively arranged on two sides of the open end of the second core block, and each groove corresponds to each branch of the end part of the liquid flowing channel.
9. The forming mold for manufacturing the hydraulic shaft core of the gear box according to claim 8, wherein two positioning blocks are arranged on the second core block side by side, and one side of the two positioning blocks opposite to each other is arc-shaped, wherein the arc is matched with the outer contour of the casting sleeve, one side of each positioning block is provided with a strip groove, and two ends of each strip groove are respectively communicated with the notch on the casting sleeve and the groove on the second core block.
10. The forming die for preparing the hydraulic shaft core of the gear box as claimed in claim 1, wherein the ejection mechanism comprises die legs connected with two sides of the lower die respectively, and a top plate is arranged between the two die legs, wherein a plurality of support columns and a plurality of ejector rods are arranged between the top plate and the lower die, and the positions of a part of the ejector rods correspond to the positions of the slag ladle cavities in the lower die core, and the positions of the other part of the ejector rods correspond to the positions of the lower die core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920580475.0U CN209918854U (en) | 2019-04-25 | 2019-04-25 | Forming die for manufacturing hydraulic shaft core of gear box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920580475.0U CN209918854U (en) | 2019-04-25 | 2019-04-25 | Forming die for manufacturing hydraulic shaft core of gear box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209918854U true CN209918854U (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920580475.0U Expired - Fee Related CN209918854U (en) | 2019-04-25 | 2019-04-25 | Forming die for manufacturing hydraulic shaft core of gear box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209918854U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112776281A (en) * | 2021-02-07 | 2021-05-11 | 台州职业技术学院 | Linkage core-pulling mechanism of injection mold |
| WO2022126928A1 (en) * | 2020-12-18 | 2022-06-23 | 苏州广型模具有限公司 | Lightweight motor housing die-casting mold |
-
2019
- 2019-04-25 CN CN201920580475.0U patent/CN209918854U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022126928A1 (en) * | 2020-12-18 | 2022-06-23 | 苏州广型模具有限公司 | Lightweight motor housing die-casting mold |
| CN112776281A (en) * | 2021-02-07 | 2021-05-11 | 台州职业技术学院 | Linkage core-pulling mechanism of injection mold |
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