A die-casting mold for automobile gear hub

Abstract

The present invention discloses a die-casting mold for an automobile gear hub, comprising an upper mold plate and a lower mold plate, an upper mold core and a lower mold core are arranged between the upper mold plate and the lower mold plate, a mold cavity is formed between the upper mold core and the lower mold core, and is characterized in that a slider seat is installed on one side of the lower mold plate, a guide seat which can slide transversely and extend between the upper mold plate and the lower mold plate is arranged on the upper side of the slider seat, an extrusion cylinder connected to the guide seat is slidably arranged inside the slider seat, a high-pressure oil cavity is arranged inside the extrusion cylinder, an extrusion seat is arranged on the side of the extrusion cylinder facing the guide seat, the extrusion seat is connected to a molding mandrel which slides transversely on the guide seat, one end of the molding mandrel extends into the mold cavity, a slider oil cylinder which drives the extrusion cylinder to slide is installed on the slider seat, and a telescopic feed pipe is axially arranged on the side of the upper mold core and the lower mold core away from the molding mandrel. The present invention can solve the problem that the existing die-casting mold cannot reliably mold the internal spline teeth of the gear hub.

Description

Technical Field

[0001] The invention relates to the technical field of automobile gear hub production, in particular to a die-casting mold for an automobile gear hub. Background Art

[0002] The gear hub is a very important component in the automobile synchronizer (such as Figure 7 As shown in the figure, it is cylindrical and has a circle of spline teeth inside. At present, when the gear hub is produced, a semi-finished product is generally formed by a die-casting mold, and then the inner cavity of the semi-finished product is finely processed to produce spline teeth. The process is complicated and the cost is relatively high. If the spline teeth are supported by a die-casting mold, more pore defects or surface defects are likely to appear during the spline tooth forming process, and the cooling and solidification of the spline tooth position cannot be guaranteed. The surface of the spline teeth is easily damaged during demolding. Therefore, how to use a die-casting mold to reliably form a complete gear hub is a technical problem that needs to be solved at present. Summary of the invention

[0003] The invention provides a die-casting die for an automobile gear hub, which can solve the problem that the existing die-casting die cannot reliably form the internal spline teeth of the gear hub.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a die-casting mold for an automobile gear hub, comprising an upper mold plate and a lower mold plate, an upper mold core and a lower mold core are arranged between the upper mold plate and the lower mold plate, and a mold cavity is formed between the upper mold core and the lower mold core, characterized in that a slider seat is installed on one side of the lower mold plate, a guide seat which can slide laterally and extend between the upper mold plate and the lower mold plate is arranged on the upper side of the slider seat, an extrusion cylinder body connected to the guide seat is slidably arranged inside the slider seat, a high-pressure oil chamber is arranged inside the extrusion cylinder body, an extrusion seat is arranged on the side of the extrusion cylinder body facing the guide seat, the extrusion seat is connected to a molding mandrel which slides laterally on the guide seat, one end of the molding mandrel extends into the mold cavity, and the slider A slider cylinder for driving the extrusion cylinder body to slide is installed on the seat. Feed blocks are arranged on the side of the upper mold core and the lower mold core away from the forming core shaft. A telescopic feed pipe is axially arranged between the feed blocks. The telescopic feed pipe is inserted between the two feed blocks and limited by the inner ends of the feed blocks when the mold is closed, and is separated to the outside of the mold when the mold is opened. By arranging the extrusion cylinder body, an axial thrust can be applied to the forming core shaft during molding, and the product formed in the mold cavity can be extruded as a whole, so that the position of the spline teeth inside the product is not prone to pores and surface defects. At the same time, the telescopic feed pipe can reduce the volume of the material handle during molding feeding, reduce the waste of raw materials, and can also axially extrude the product in the mold cavity from another direction to improve the molding quality.

[0005] Preferably, a plurality of slide rail blocks are installed side by side at the bottom of the extrusion cylinder body and the bottom of the guide seat, and a cross-spiral lubrication groove is provided on the upper side of the slide rail block, which can effectively support and guide the sliding of the extrusion cylinder body and the guide seat. At the same time, the cross-spiral lubrication groove can store more lubricating grease, and the lubricating grease is not easily carried out to the outside of the lubrication groove.

[0006] Preferably, at least one oil inlet pipe and at least one oil outlet pipe are installed on the side wall of the extrusion cylinder body, so that high-pressure hydraulic oil can be fed in at high speed and hydraulic oil can be discharged quickly.

[0007] Preferably, when the telescopic feed tube is inserted between the two feed blocks, its end is sealed and fitted with the side walls of the upper mold core and the lower mold core, and a plurality of grooves are arranged around the circumference of the outer side of the end of the telescopic feed tube, and a limit block which can move radially along the telescopic feed tube is arranged in the groove, and the bottom of the limit block is connected to the groove by at least one spring, and the inserted telescopic feed tube can be limited by the clamping connection between the limit block and the feed block, so as to prevent the telescopic feed tube from retreating when the telescopic feed tube squeezes the material in the mold cavity.

[0008] Preferably, arc guide portions are provided at the tops of both ends of the limit block, which can contact the two end positions of the feed block when the telescopic feed tube is inserted into the feed block to retract the limit block into the groove.

[0009] Preferably, the outer side of the extrusion seat is connected to the tail end of the molding core shaft through a connecting shaft, and a cooling column is axially arranged inside the molding core shaft, and a cooling cavity and a spiral cooling channel are formed between the end of the cooling column close to the mold cavity and the molding core shaft, and external cooling water circulates in the spiral cooling channel and the cooling cavity. By arranging the cooling cavity and the spiral cooling channel at the end of the cooling column, the cooling effect of the end of the molding spline tooth on the molding core shaft can be improved, so that the product is not prone to surface damage during demolding.

[0010] Preferably, a main cooling hole is axially arranged in the middle of the cooling column and passes through both ends. The main cooling hole is connected to the cooling cavity. One end of the spiral cooling channel is connected to the auxiliary cooling hole axially arranged inside the cooling column. A water inlet hole connected to the main cooling hole and a water outlet hole connected to the auxiliary cooling hole are arranged in the connecting shaft. The water inlet hole and the water outlet hole are connected to the water pipe joint on the outer wall of the connecting shaft. The design of the pipeline allows the cooling water to flow quickly in the cooling cavity and the spiral cooling channel, thereby improving the cooling effect without affecting the axial movement and demolding of the molding core shaft.

[0011] Preferably, the cooling chamber is provided with a cooling inner groove extending axially toward the end of the molding core shaft, and one side of the cooling inner groove is provided with a cooling guide groove extending toward the end of the spiral cooling channel. By providing the cooling inner groove, the space of the cooling chamber is made larger, and the cooling water can be closer to the molding area. At the same time, the cooling guide groove can guide the cooling water to the inlet position of the spiral cooling channel, thereby increasing the flow rate of the cooling water and preventing the cooling water in the cooling chamber from flowing back.

[0012] Preferably, a plurality of demoulding pins are vertically arranged inside the lower mold plate and the lower mold core, and the demoulding pins are arranged at both ends of the mold cavity. A ejector plate connected to the demoulding pins is arranged below the lower mold plate to eject the product from both ends of the mold cavity, mainly corresponding to the material handle part and the step part at the end of the product, without causing damage to the product.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] By setting an extrusion cylinder on one side of the mold, an axial thrust can be applied to the molding mandrel during molding, and the molded product in the mold cavity can be extruded as a whole, so that the position of the spline teeth inside the product is not prone to pores and surface defects. At the same time, a telescopic feed pipe can be set to reduce the volume of the material handle during molding and feeding, reducing the waste of raw materials. The product in the mold cavity can also be axially extruded from another direction to improve the molding quality.

[0015] A cooling column is arranged inside the molding mandrel, and a cooling cavity and a spiral cooling channel are arranged at the end of the cooling column to improve the cooling effect of the end of the molding spline tooth on the molding mandrel, so that the surface of the product is not easily damaged during demolding;

[0016] A radially movable limit block is provided at the end of the telescopic feed tube. The inserted telescopic feed tube can be limited by the clamping connection between the limit block and the feed block. When the telescopic feed tube squeezes the material in the mold cavity, the telescopic feed tube can be prevented from retreating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 The main structural diagram of the present invention is

[0019] Figure 3 It is a front view half-section structure diagram of the present invention;

[0020] Figure 4 for Figure 3 A magnified structural diagram;

[0021] Figure 5 It is a cross-sectional partial enlarged structural diagram of the present invention;

[0022] Figure 6 It is a three-dimensional structural diagram of the present invention after removing the extrusion cylinder body and the guide seat;

[0023] Figure 7 It is a three-dimensional structural diagram of the gear hub corresponding to the present invention.

[0024] Reference numerals:

[0025] 1. Upper template, 11. Slider cylinder, 12. Extrusion seat, 13. Slide block, 14. Limit block, 15. Connecting shaft, 16. Guide seat, 17. Cooling column, 18. Demolding ejector pin, 19. Top plate, 2. Lower template, 21. Cooling inner groove, 22. Spring, 23. Groove, 24. Spiral cooling channel, 25. Auxiliary cooling hole, 26. Main cooling hole, 27. Water inlet hole, 28. Water outlet hole, 29. Water pipe joint, 3. Upper mold core, 30. Cooling guide groove, 31. Lubrication groove, 32. Arc guide part, 4. Feed block, 5. Telescopic feed pipe, 6. Molding mandrel, 7. Slider seat, 8. Extrusion cylinder, 9. High-pressure oil chamber, 10. Lower mold core. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] like Figure 1-7As shown, the present invention solves the problem that the existing die-casting mold cannot reliably form the internal spline teeth of the gear hub, and provides the following technical solutions: A die-casting mold for an automobile gear hub, comprising an upper mold plate 1 and a lower mold plate 2, an upper mold core 3 and a lower mold core 10 are arranged between the upper mold plate 1 and the lower mold plate 2, and a mold cavity is formed between the upper mold core 3 and the lower mold core 10, characterized in that a slider seat 7 is installed on one side of the lower mold plate 2, a guide seat 16 which can slide laterally and extend between the upper mold plate 1 and the lower mold plate 2 is arranged on the upper side of the slider seat 7, an extrusion cylinder body 8 connected to the guide seat 16 is slidably arranged inside the slider seat 7, a high-pressure oil chamber 9 is arranged inside the extrusion cylinder body 8, an extrusion seat 12 is arranged on the side of the extrusion cylinder body 8 facing the guide seat 16, and the extrusion seat 12 is connected to a molding core shaft 6 which slides laterally on the guide seat 16, and the One end of the forming mandrel 6 extends into the mold cavity, and a slider cylinder 11 for driving the extrusion cylinder body 8 to slide is installed on the slider seat 7. Feed blocks 4 are arranged on the side of the upper mold core 3 and the lower mold core 10 away from the forming mandrel 6, and a telescopic feed pipe 5 is axially arranged between the feed blocks 4. The telescopic feed pipe 5 is inserted between the two feed blocks 4 and limited by the inner end of the feed block 4 when the mold is closed, and is separated to the outside of the mold when the mold is opened. By setting the extrusion cylinder body 8, an axial thrust can be applied to the forming mandrel 6 during molding, and the product formed in the mold cavity can be extruded as a whole, so that the position of the spline teeth inside the product is not prone to pores and surface defects. At the same time, the telescopic feed pipe 5 can reduce the volume of the material handle during molding feeding, reduce the waste of raw materials, and can also axially extrude the product in the mold cavity from another direction to improve the molding quality.

[0028] Specifically, since the molding pressure requirement of the spline teeth inside the gear hub is relatively large, the axial extrusion force requirement for the molding core shaft 6 is also relatively large, so the area of ​​the high-pressure oil chamber 9 and the extrusion seat 12 in the extrusion cylinder 8 also needs to be increased accordingly to provide a higher extrusion pressure. At least one oil inlet pipe and at least one oil outlet pipe are installed on the side wall of the extrusion cylinder 8, which can realize high-speed intake of high-pressure hydraulic oil and rapid discharge of hydraulic oil. If two side-by-side oil inlet pipes and two oil outlet pipes are set at the same time, when high-pressure hydraulic oil is introduced into the high-pressure oil chamber 9, a lateral extrusion pressure can be applied to the extrusion seat 12. The displacement of the extrusion seat 12 is very small, only 1-2mm, so an embedded sealing ring can be set between the extrusion seat 12 and the extrusion cylinder 8 for sealing to ensure that the hydraulic oil will not leak.

[0029] When demolding, the entire molding mandrel 6 needs to be pulled out of the mold cavity, and the slider cylinder 11 can drive the extrusion cylinder body 8, the guide seat 16 and the molding mandrel 6 to move synchronously. The molding mandrel 6 is separated from the molded product before demolding.

[0030] Conventional die-casting molds generally do not have a telescopic feed tube 5. Generally, there is only one fixed feed tube fixed on one side of the mold cavity, and there is a distance between the feed tube and the mold cavity, which results in a relatively large material handle after the product is formed. The material handle needs to be removed in the subsequent processing. If the material handle is relatively large, it will not only affect demolding, but also waste materials. Therefore, a movable and telescopic telescopic feed tube 5 is used in this embodiment. The telescopic feed tube 5 means that it can move axially relative to the mold cavity. It can be moved by a cylinder or by other power components. After being inserted into the position between the feed blocks 4, the product being formed can be squeezed to improve the molding effect. In addition, the material handle is relatively small, and demolding is more convenient after the telescopic feed tube 5 is withdrawn, and material loss is relatively small.

[0031] In this embodiment, if Figure 6 As shown, a plurality of slide rail blocks 13 are installed side by side at the bottom of the extrusion cylinder 8 and the bottom of the guide seat 16, and a cross-spiral lubrication groove 31 is arranged on the upper side of the slide rail block 13, which can effectively support and guide the sliding of the extrusion cylinder 8 and the guide seat 16, and at the same time, the cross-spiral lubrication groove 31 can store more lubricating grease, and the lubricating grease is not easily brought out of the lubrication groove 31.

[0032] In order to limit the position of the telescopic feed pipe 5, as Figure 4 As shown, when the telescopic feed tube 5 is inserted between the two feed blocks 4, its end is sealed and fitted with the side walls of the upper mold core 3 and the lower mold core 10, and a plurality of grooves 23 are arranged around the circumference on the outer side of the end of the telescopic feed tube 5, and a limit block 14 which can move radially along the telescopic feed tube 5 is arranged in the groove 23, and the bottom of the limit block 14 is connected to the groove 23 by at least one spring 22, and the inserted telescopic feed tube 5 can be limited by the clamping connection between the limit block 14 and the feed block 4, and when the telescopic feed tube 5 squeezes the material in the mold cavity, the telescopic feed tube 5 can be prevented from retreating, and a plurality of springs 22 can be arranged side by side between the limit block 14 and the groove 23, and the limit block 14 can be in the shape of an arc arranged along the circumference, and a plurality of limit blocks 14 form a circle, which has a good limiting effect. At the same time, arc guide parts 32 are provided on the top of both ends of the limit block 14, which can contact the two end positions of the feed block 4 when the telescopic feed tube 5 is inserted into the feed block 4 to retract the limit block 14 into the groove 23. When the telescopic feed tube 5 is inserted into the feed block 4, the arc guide part 32 at the front end of the limit block 14 is squeezed with the edge of the inner hole of the feed block 4, so that the limit block 14 is radially retracted, allowing the telescopic feed tube 5 to enter. When the telescopic feed tube 5 needs to be disengaged, the telescopic feed tube 5 is pulled back in the same way, so that the arc guide part 32 at the rear end of the limit block 14 is squeezed with the edge of the inner hole of the feed block 4, which can also retract the limit block 14 radially, thereby realizing the withdrawal of the telescopic feed tube 5.

[0033] In this embodiment, in order to make the forming mandrel 6 have a better cooling function, as shown in FIG. Figure 3-5 As shown, the outer side of the extrusion seat 12 is connected to the tail end of the molding mandrel 6 through a connecting shaft 15, and a cooling column 17 is axially arranged inside the molding mandrel 6. A cooling cavity and a spiral cooling channel 24 are formed between the end of the cooling column 17 close to the mold cavity and the molding mandrel 6. External cooling water circulates in the spiral cooling channel 24 and the cooling cavity. By arranging the cooling cavity and the spiral cooling channel 24 at the end of the cooling column 17, the cooling effect of the end of the molding spline tooth on the molding mandrel 6 can be improved, so that the product is not prone to surface damage during demolding. Water enters one end of the spiral cooling channel 24 and flows out at the other end, so the cooling water will only flow along the shape of the spiral cooling channel 24, and the cooling cavity is a relatively small space formed between the end of the cooling column 17 and the molding mandrel 6, in order to be closer to the end of the molding mandrel 6.

[0034] In this embodiment, if Figure 5 As shown, a main cooling hole 26 running through both ends is axially arranged in the middle of the cooling column 17, and the main cooling hole 26 is connected to the cooling cavity. One end of the spiral cooling channel 24 is connected to the auxiliary cooling hole 25 axially arranged inside the cooling column 17. A water inlet hole 27 connected to the main cooling hole 26 and a water outlet hole 28 connected to the auxiliary cooling hole 25 are arranged in the connecting shaft 15. The water inlet hole 27 and the water outlet hole 28 are connected to the water pipe joint 29 on the outer wall of the connecting shaft 15. The design of the pipeline allows the cooling water to flow quickly in the cooling cavity and the spiral cooling channel 24, thereby improving the cooling effect and not affecting the axial movement and demolding of the forming core shaft 6. The diameter of the main cooling hole 26 is larger than the diameter of the auxiliary cooling hole 25, so that the cooling water enters with a larger flow rate, and the cooling water entering the cooling cavity is dispersed and enters the spiral cooling channel 24, and finally enters the auxiliary cooling hole 25 and is discharged, and circulates in sequence.

[0035] In this embodiment, if Figure 3-4 As shown, the cooling chamber is provided with a cooling inner groove 21 extending axially toward the end of the forming core shaft 6, and one side of the cooling inner groove 21 is provided with a cooling guide groove 30 extending toward the end of the spiral cooling channel 24. By providing the cooling inner groove 21, the space of the cooling chamber is made larger, and the cooling water can be closer to the forming area. At the same time, the cooling guide groove 30 can guide the cooling water to the inlet position of the spiral cooling channel 24, thereby increasing the flow rate of the cooling water and preventing the cooling water in the cooling chamber from flowing back. The bottom of the cooling guide groove 30 is an arc surface, and the guiding effect is good.

[0036] Ejectors are generally used for demoulding. Several demoulding ejectors 18 are vertically arranged inside the lower template 2 and the lower mold core 10. The demoulding ejectors 18 are arranged at both ends of the mold cavity. A top plate 19 connected to the demoulding ejectors 18 is arranged below the lower template 2 to eject the product from both ends of the mold cavity, mainly corresponding to the handle part and the step part at the end of the product, without causing damage to the product. After the mold is formed, the mold is opened, and at the same time, the molding core shaft 6 and the telescopic feed tube 5 are away from the mold cavity. At this time, the product can be ejected by pushing up the top plate 19.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A die-casting mold for an automobile gear hub, comprising an upper mold plate (1) and a lower mold plate (2), an upper mold core (3) and a lower mold core (10) are arranged between the upper mold plate (1) and the lower mold plate (2), and a mold cavity is formed between the upper mold core (3) and the lower mold core (10), characterized in that: A slider seat (7) is installed on one side of the lower mold plate (2), and a guide seat (16) is arranged on the upper side of the slider seat (7) and can slide transversely and extend between the upper mold plate (1) and the lower mold plate (2). An extrusion cylinder body (8) connected to the guide seat (16) is slidably arranged inside the slider seat (7), and a high-pressure oil chamber (9) is arranged inside the extrusion cylinder body (8). An extrusion seat (12) is arranged on the side of the extrusion cylinder body (8) facing the guide seat (16), and the extrusion seat (12) is connected to a molding mandrel (6) that slides transversely on the guide seat (16). One end of the molding mandrel (6) extends into the mold cavity. A slider oil cylinder (11) that drives the extrusion cylinder body (8) to slide is installed on the slider seat (7), and the upper mold core (3) and the lower mold core (10) are both arranged on the side away from the molding mandrel (6). Material blocks (4), a telescopic feed tube (5) is axially arranged between the feed blocks (4), the telescopic feed tube (5) is inserted between the two feed blocks (4) and limited by the inner end of the feed block (4) when the mold is closed, and is separated to the outside of the mold when the mold is opened, and the end of the telescopic feed tube (5) is sealed and fitted with the side walls of the upper mold core (3) and the lower mold core (10) when the telescopic feed tube (5) is inserted between the two feed blocks (4), and the telescopic feed tube (5) is inserted into the position between the feed blocks (4) to extrude the product being formed, and a plurality of grooves (23) are arranged around the circumference of the outer side of the end of the telescopic feed tube (5), and a limit block (14) that can move radially along the telescopic feed tube (5) is arranged in the groove (23), and the bottom of the limit block (14) is connected to the groove (23) by at least one spring (22); The outer side of the extrusion seat (12) is connected to the rear end of the molding mandrel (6) via a connecting shaft (15); a cooling column (17) is axially arranged inside the molding mandrel (6); a cooling cavity and a spiral cooling channel (24) are formed between the end of the cooling column (17) close to the mold cavity and the molding mandrel (6); external cooling water circulates in the spiral cooling channel (24) and the cooling cavity; A main cooling hole (26) is axially arranged in the middle of the cooling column (17) and passes through both ends. The main cooling hole (26) is connected to the cooling cavity. One end of the spiral cooling channel (24) is connected to an auxiliary cooling hole (25) axially arranged inside the cooling column (17). A water inlet hole (27) connected to the main cooling hole (26) and a water outlet hole (28) connected to the auxiliary cooling hole (25) are arranged in the connecting shaft (15). The water inlet hole (27) and the water outlet hole (28) are connected to a water pipe joint (29) on the outer wall of the connecting shaft (15). The cooling cavity is provided with a cooling inner groove (21) extending axially toward the end of the forming core shaft (6); one side of the cooling inner groove (21) is provided with a cooling guide groove (30) extending toward the end of the spiral cooling channel (24); and the bottom of the cooling guide groove (30) is an arc surface.

2. The die-casting mold for the automotive gear hub according to claim 1, characterized in that: A plurality of slide rail blocks (13) are installed side by side at the bottom of the extrusion cylinder (8) and the bottom of the guide seat (16), and a cross-spiral lubrication groove (31) is arranged on the upper side of the slide rail block (13).

3. The die-casting mold for the automotive gear hub according to claim 1, characterized in that: At least one oil inlet pipe and at least one oil outlet pipe are installed on the side wall of the extrusion cylinder (8).

4. The die-casting mold for the automotive gear hub according to claim 1, characterized in that: Arc guide parts (32) are provided at the tops of both ends of the limit block (14).

5. The die-casting mold for the automotive gear hub according to claim 1, characterized in that: A plurality of demoulding ejector pins (18) are vertically arranged inside the lower mold plate (2) and the lower mold core (10). The demoulding ejector pins (18) are arranged at both ends of the mold cavity. A top plate (19) connected to the demoulding ejector pins (18) is arranged below the lower mold plate (2).

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