A high-pressure casting mold for a vehicle body structural member and a casting method thereof

Abstract

The application relates to a high-pressure casting mold for a vehicle body structure member and a casting method thereof, and relates to the technical field of structure member casting molds. The high-pressure casting mold comprises an upper mold, a lower mold and a pushing base. A mold top cover is connected to the top of the upper mold through bolts, and a pouring opening is arranged in the mold top cover. The lower mold is arranged between the upper mold and the pushing base, and the upper mold, the lower mold and the pushing base are slidably connected through four groups of vertical columns. In the production process, the lower mold and the upper mold are cooled to control the working temperature of the mold within a stable and uniform range, reduce the risk of deformation and thermal cracking of the cast member, slow down the flow rate of aluminum casting liquid during casting, improve the anti-sticking effect of the cast member, prevent the cast member from adhering to the exhaust passage by coating a nitrogen coating layer in the forming cavity, and improve the demolding efficiency by using the obliquely arranged guide rod to assist the demolding of the cast member, so that the continuity of production is ensured.

Description

Technical Field

[0001] This application relates to the field of structural component casting mold technology, and in particular to a high-pressure casting mold for vehicle body structural components and its casting method. Background Technology

[0002] Casting molds are molds used in the casting process to form castings. They are widely used in the production and processing of parts. With the rapid development of the automotive industry, more and more automotive structural parts need to be cast, and the demand for casting molds is also gradually increasing.

[0003] A search revealed an existing patent (publication number: CN221620766U) that discloses a casting mold for large thin-walled structural parts, including an upper mold, a lower mold, and a sprue plate. The upper mold, lower mold, and sprue plate are arranged sequentially, forming a casting cavity in which the casting is formed. The lower mold has multiple runners, which solves the problems of poor filling, cold shuts, and insufficient casting that easily occur during the casting process of large-sized castings. The sprue plate has a solution receiving cavity. The upper mold, lower mold, and sprue plate, with multiple runners in the mold, form a multi-point feeding system, solving the problem of poor filling. After casting, the metal support formed by solidification in the runners and receiving cavity provides reinforcement and support for the casting during quenching, reducing deformation during subsequent heat treatment. In the process of realizing this application, the inventors discovered the following problems with the prior art:

[0004] When casting aluminum structural parts, the high-pressure casting environment inside the existing casting molds can easily cause the castings to stick to the mold, making them difficult to demold and preventing continuous production, which in turn affects the production quality of the castings.

[0005] Therefore, in response to the aforementioned technical problems, a high-pressure casting mold for vehicle body structural parts and its casting method are proposed. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a high-pressure casting mold for vehicle body structural components and a casting method thereof.

[0007] This application provides a high-pressure casting mold for a vehicle body structural component and a casting method thereof, employing the following technical solution:

[0008] A high-pressure casting mold for a car body structural component includes an upper mold, a lower mold, and a pusher base. The top of the upper mold is bolted to a mold top cover, and a casting port is provided inside the mold top cover. The lower mold is disposed between the upper mold and the pusher base, and the upper mold, the lower mold, and the pusher base are slidably connected by four sets of columns.

[0009] The lower mold is connected to a demolding cylinder on one side, and a casting molding box, a push rod connecting box, and a connecting slider are provided on the top of the lower mold. The casting port is connected to the casting molding box, and exhaust boxes are connected to both sides of the casting molding box. The exhaust boxes are located between the upper mold and the lower mold.

[0010] Preferably, a cylinder fixing frame is connected between the demolding cylinder and the lower mold, a telescopic shaft is provided inside the demolding cylinder, and one end of the telescopic shaft is connected to the connecting slider. Cooling inlet and cooling outlet are provided on the side of the upper mold and the lower mold away from the demolding cylinder.

[0011] Preferably, both the upper mold and the lower mold are provided with an oil inlet and a cooling inlet on one side, and both the upper mold and the lower mold are provided with a cooling outlet and an oil outlet on the side away from the oil inlet, and the oil inlet, cooling inlet, cooling outlet and oil outlet are all connected to the casting molding box.

[0012] Preferably, the top of the lower mold is provided with two sets of translation slide rails, and the connecting slider is slidably connected to the two sets of translation slide rails, and the push rod connecting box is connected to the top of the connecting slider.

[0013] Preferably, the end of the push rod connecting box away from the connecting slider is connected to a pusher box, the pusher box is set inside the casting molding box, and the casting molding box is provided with a main gating system, a pusher slide rail and a molding cavity.

[0014] Preferably, the molding cavity is located between the main runner and the pusher box, the main runner is connected to the molding cavity, and one end of the casting port is connected to the main runner. The pusher connecting box is slidably connected to the pusher slide rail.

[0015] By adopting the above technical solution, the working temperature of the mold is controlled within a stable and uniform range by cooling the lower and upper molds during the production process, reducing the risk of deformation and thermal cracking of the castings. Furthermore, by slowing down the flow rate of the aluminum molten casting, the anti-sticking effect of the castings is further improved.

[0016] Preferably, the exhaust box is formed by two sets of hollow blocks joined together by threads, and an exhaust block is provided inside the exhaust box. The casting molding box is provided with multiple sets of exhaust channels, and the two ends of the exhaust channels are respectively connected to the exhaust block and the molding cavity.

[0017] Preferably, the push rod connecting box is connected to five sets of guide rods, and one end of each guide rod is inserted into the molding cavity. The five sets of guide rods are parallel to each other, and the angle between the guide rods and the push rod connecting box is an acute angle.

[0018] Preferably, the pusher base is provided with an upper ejector plate and a lower ejector plate, and ejector pins are connected inside the upper ejector plate and the lower ejector plate. A connecting column connects the lower mold and the pusher base.

[0019] By adopting the above technical solution, a nitrogen coating is applied to the molding cavity, especially at the position of the exhaust channel close to the molding cavity, to prevent the casting from sticking to the exhaust channel. An obliquely set guide rod is used to assist the casting in demolding, thereby improving the demolding efficiency. The telescopic guide rod can directly form openings on the casting to ensure the continuity of production.

[0020] Preferably, a casting method for a high-pressure casting mold for a vehicle body structural component includes the following steps:

[0021] Step 1: Connect the casting port of the upper mold to the casting equipment, and connect the pusher base to the cylinder assembly for die casting demolding. Then connect the oil inlet and outlet on the upper and lower molds to the oil tank storing hydraulic oil through pipelines, and connect the cooling inlet and cooling outlet to the refrigeration equipment through pipelines.

[0022] Step 2: The aluminum casting liquid enters through the casting gate, and then is injected into the molding cavity through the main runner connected to the casting gate to form the preset casting shape. The aluminum casting liquid is injected at a slow speed.

[0023] Step 3: When the aluminum casting liquid enters the molding cavity, the air inside is discharged through the exhaust channel. When the aluminum casting liquid is filled in the molding cavity, the molding cavity is continuously kept under high pressure, which forces the aluminum casting liquid to solidify and form under pressure, and the pressure is maintained for a certain period of time.

[0024] Step 4: The demolding cylinder drives the push rod connecting box connected to the connecting slider to move, and during the movement, the cast part is pushed out by the inclined guide rod, thus completing the demolding.

[0025] Step 5: Open the lower and upper molds, and eject the casting from the ejector pin in the pusher base. Remove the casting and repeat the above steps to achieve continuous casting of automotive structural parts.

[0026] 1. Compared with the prior art, the high-pressure casting mold and casting method for the body structure component of this invention, through heat dissipation and cooling of the lower mold and the upper mold during the production process, controls the working temperature of the mold within a stable and uniform range, reducing the risk of deformation and thermal cracking of the casting. The upper mold and the lower mold are equipped with circulating cooling pipes connected to the cooling inlet and cooling outlet, and the upper mold and the lower mold are cooled through the circulating cooling pipes. When the aluminum casting liquid is injected, slow injection is adopted. When the aluminum casting liquid enters the molding cavity, the air inside it is discharged into the exhaust block through the exhaust channel and discharged outward from the exhaust block. When the aluminum casting liquid is filled in the molding cavity, the molding cavity is continuously kept under high pressure, forcing the aluminum casting liquid to solidify and form under pressure.

[0027] 2. Compared with the prior art, this high-pressure casting mold for car body structural parts and its casting method improve the anti-sticking effect of the casting by slowing down the flow rate of aluminum molten casting during casting. It prevents the casting from sticking to the exhaust channel by applying a nitrogen coating inside the molding cavity, especially at the position of the exhaust channel close to the molding cavity. It also improves the demolding efficiency by using obliquely set guide rods to assist the casting in demolding. Furthermore, the retractable guide rods can directly form openings on the casting to ensure the continuity of production. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the entire right side of this application;

[0029] Figure 2 This is a three-dimensional structural diagram of the left side of the entire application;

[0030] Figure 3 This is a schematic diagram of the overall front structure of this application;

[0031] Figure 4 This is a schematic diagram of the structure at the top of the mold in this application;

[0032] Figure 5 This is a top view of the structure of the mold in this application;

[0033] Figure 6 This is a schematic diagram of the internal structure of the casting molded box in this application;

[0034] Figure 7 This is a schematic diagram of the internal structure of the pusher box in this application;

[0035] Figure 8 This is a structural schematic diagram of the push rod connecting box in this application.

[0036] The attached diagram is labeled as follows: 1. Upper mold; 11. Mold top cover; 12. Sprue; 13. Casting box; 131. Main runner; 132. Venting channel; 133. Pusher slide rail; 14. Connecting slider; 141. Guide rod; 15. Push rod connecting box; 16. Venting box; 161. Venting block; 17. Pusher box; 18. Translation slide rail; 19. Molding cavity; 2. Lower mold; 3. Pusher base; 31. Upper ejector plate; 32. Lower ejector plate; 33. Ejector pin; 34. Connecting column; 4. Demolding cylinder; 41. Telescopic shaft; 42. Cylinder fixing bracket; 5. Oil inlet; 6. Cooling outlet; 7. Cooling inlet; 8. Oil outlet. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail below.

[0039] A high-pressure casting mold for a car body structural component includes an upper mold 1, a lower mold 2 and a pusher base 3. The top of the upper mold 1 is connected to a mold top cover 11 by bolts, and a casting port 12 is provided inside the mold top cover 11. The lower mold 2 is located between the upper mold 1 and the pusher base 3, and the upper mold 1, the lower mold 2 and the pusher base 3 are slidably connected by four sets of columns.

[0040] The lower mold 2 is connected to a demolding cylinder 4 on one side. The top of the lower mold 2 is provided with a casting forming box 13, a push rod connecting box 15, and a connecting slider 14. The casting port 12 is connected to the casting forming box 13. Both sides of the casting forming box 13 are connected to exhaust boxes 16, and the exhaust boxes 16 are located between the upper mold 1 and the lower mold 2. The casting is formed between the upper mold 1 and the lower mold 2. Molten liquid aluminum is injected into the space between the upper mold 1 and the lower mold 2 through the casting port 12 of the mold top cover 11, and the forming work is completed in the casting forming box 13.

[0041] In a preferred embodiment, a cylinder fixing frame 42 is connected between the demolding cylinder 4 and the lower mold 2. A telescopic shaft 41 is provided inside the demolding cylinder 4, and one end of the telescopic shaft 41 is connected to the connecting slider 14. Cooling inlet 7 and cooling outlet 6 are provided on the side of the upper mold 1 and the lower mold 2 away from the demolding cylinder 4. The demolding cylinder 4 is connected to one side of the lower mold 2 through the cylinder fixing frame 42, and the connecting slider 14 is driven to slide by the demolding cylinder 4 through the telescopic shaft 41.

[0042] In a preferred embodiment, both the upper mold 1 and the lower mold 2 are provided with an oil inlet 5 and a cooling inlet 7 on one side, and a cooling outlet 6 and an oil outlet 8 are provided on the side of the upper mold 1 and the lower mold 2 away from the oil inlet 5. The oil inlet 5, the cooling inlet 7, the cooling outlet 6, and the oil outlet 8 are all connected to the casting box 13. The oil inlet 5 and the oil outlet 8 and the pipelines connected to them are used to transmit hydraulic oil. The upper mold 1 and the lower mold 2 are provided with circulating cooling pipes that are connected to the cooling inlet 7 and the cooling outlet 6. The circulating cooling pipes are used to dissipate heat and cool the upper mold 1 and the lower mold 2, so as to control the working temperature of the entire mold within a stable and uniform range, thereby reducing the risk of deformation and thermal cracking of the casting. The internal circulating cooling pipes are arranged according to the area to be cooled. The specific structure is not described in detail here.

[0043] In a preferred embodiment, the top of the lower mold 2 is provided with two sets of translation slide rails 18, and the connecting slider 14 is slidably connected to the two sets of translation slide rails 18. The push rod connecting box 15 is connected to the top of the connecting slider 14. The connecting slider 14 slides on the two sets of translation slide rails 18, and drives the push rod connecting box 15 connected to it to move together during the sliding process.

[0044] In a preferred embodiment, the end of the push rod connecting box 15 furthest from the connecting slider 14 is connected to a pusher box 17. The pusher box 17 is disposed inside the casting molding box 13, which contains a main gating system 131, a pusher slide rail 133, and a molding cavity 19. The molding cavity 19 is disposed between the main gating system 131 and the pusher box 17. The main gating system 131 is connected to the molding cavity 19, and one end of the casting port 12 is connected to the main gating system 131. The push rod connecting box 15 is slidably connected to the pusher slide rail 133. The material slides on the pusher slide rail 133, and the translation slide rail 18 and the pusher slide rail 133 limit the movement distance of the connecting slider 14 and the pusher connecting box 15 respectively. The pusher connecting box 15 slides in the pusher box 17. The aluminum casting liquid enters through the casting port 12, and then the main gating channel 131, which is connected to the casting port 12, injects the aluminum casting liquid into the forming cavity 19. The inner side of the forming cavity 19, especially the position of the exhaust channel 132 close to the forming cavity 19, is coated with a nitrogen coating, which can effectively prevent the casting from sticking to the exhaust channel.

[0045] In a preferred embodiment, the exhaust box 16 is formed by two sets of hollow blocks joined together by threads, and an exhaust block 161 is provided inside the exhaust box 16. The casting molding box 13 is provided with multiple sets of exhaust channels 132, and the two ends of the exhaust channels 132 are respectively connected to the exhaust block 161 and the molding cavity 19. Both the exhaust box 16 and the exhaust block 161 are provided with interconnected exhaust holes, which can discharge gas to the outside. When the aluminum casting liquid enters the molding cavity 19, the air inside it is discharged to the exhaust block 161 through the exhaust channel 132 and discharged to the outside from the exhaust block 161. When the aluminum casting liquid is filled in the molding cavity 19, the molding cavity 19 is continuously kept under high pressure, forcing the aluminum casting liquid to solidify and form under pressure, and the pressure is maintained for a certain period of time.

[0046] In a preferred embodiment, five sets of guide rods 141 are connected inside the push rod connecting box 15, and one end of the guide rod 141 is inserted into the molding cavity 19. The five sets of guide rods 141 are parallel to each other, and the angle between the guide rod 141 and the push rod connecting box 15 is an acute angle. The push rod connecting box 15 drives the five sets of guide rods 141 inside to slide out of the push box 17, and the five sets of guide rods 141 push out the cast part during the sliding process, completing the initial demolding. The obliquely set guide rods 141 are conducive to the demolding of the cast part, improve the demolding efficiency, and the telescopic guide rods 141 can directly form openings on the cast part.

[0047] In a preferred embodiment, the pusher base 3 is provided with an upper ejector plate 31 and a lower ejector plate 32, and ejector pins 33 are connected in the upper ejector plate 31 and the lower ejector plate 32. A connecting column 34 connects the lower mold 2 and the pusher base 3. After the casting is produced, the casting is ejected by the ejector pins 33 in the pusher base 3. The pushing actions of the upper ejector plate 31, the lower ejector plate 32, the connecting column 34, and the ejector pins 33 are all conventional technical means in the art and will not be described in detail here.

[0048] As a preferred embodiment, a casting method for a high-pressure casting mold for a vehicle body structural component includes the following steps:

[0049] Step 1: Connect the casting port 12 of the upper mold 1 to the casting equipment, and connect the pusher base 3 to the cylinder assembly for die casting demolding. Then connect the oil inlet 5 and oil outlet 8 on the upper mold 1 and the lower mold 2 to the oil tank storing hydraulic oil through pipelines, and connect the cooling inlet 7 and cooling outlet 6 to the refrigeration equipment through pipelines.

[0050] Step 2: The aluminum casting liquid enters through the casting port 12, and then the main gating 131, which is connected to the casting port 12, injects the aluminum casting liquid into the forming cavity 19 to form the preset casting shape. The aluminum casting liquid is injected at a slow speed.

[0051] Step 3: When the aluminum casting liquid enters the molding cavity 19, the air inside it is discharged through the exhaust channel 132. When the aluminum casting liquid is filled in the molding cavity 19, the molding cavity 19 is continuously kept under high pressure, forcing the aluminum casting liquid to solidify and form under pressure, and the pressure is maintained for a certain period of time.

[0052] Step 4: The demolding cylinder 4 drives the push rod connecting box 15 connected to the connecting slider 14 to move. During the movement, the cast part is pushed out by the inclined guide rod 141, and the demolding is completed.

[0053] Step 5: Open the lower mold 2 and the upper mold 1, and eject the casting part by the ejector pin 33 in the pusher base 3. Take out the casting part and repeat the above steps to realize the continuous casting of automotive structural parts.

[0054] The working process of this application is as follows: First, the casting port 12 of the upper mold 1 is connected to the casting equipment, and the pusher base 3 is connected to the cylinder assembly for die casting demolding. Then, the oil inlet 5 and oil outlet 8 on the upper mold 1 and the lower mold 2 are connected to the oil tank storing hydraulic oil through pipelines, and the cooling inlet 7 and cooling outlet 6 are connected to the refrigeration equipment through pipelines.

[0055] Molten liquid aluminum is injected into the space between the upper mold 1 and the lower mold 2 through the casting port 12 of the mold top cover 11. Then, the aluminum casting liquid is injected into the forming cavity 19 through the main sprue 131 which is connected to the casting port 12, forming the preset shape of the casting. The aluminum casting liquid is injected at a slow speed. When the aluminum casting liquid enters the forming cavity 19, the air inside is discharged into the vent block 161 through the vent 132 and discharged outward from the vent block 161. When the aluminum casting liquid is filled into the forming cavity 19, the forming cavity 19 is kept under high pressure, which forces the aluminum casting liquid to solidify and form under pressure and is held at pressure for a certain period of time. During the production process, the upper mold 1 and the lower mold 2 are cooled by circulating cooling pipes to keep the working temperature of the entire mold within a stable and uniform range, reducing the risk of casting deformation and thermal cracking.

[0056] After the casting has cooled and solidified, the demolding cylinder 4 drives the connecting slider 14 to slide via the telescopic shaft 41. During the sliding process, the connecting push rod box 15 connected to it moves together. As the connecting push rod box 15 moves, it drives the five sets of guide rods 141 inside to slide out of the push box 17. The telescopic guide rods 141 can directly form openings on the casting. During the sliding process, the five sets of guide rods 141 can push out the finished casting, completing the initial demolding. Finally, the lower mold 2 and the upper mold 1 are opened, and the ejector pins 33 in the push base 3 push out the casting and remove it. The above steps are repeated to realize the continuous casting of automotive structural parts.

[0057] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A casting method for a vehicle body structural component, characterized in that: The method uses a high-pressure casting mold for a car body structural component, the mold including an upper mold (1), a lower mold (2) and a pusher base (3). The top of the upper mold (1) is connected to the mold top cover (11) by bolts, and the mold top cover (11) is provided with a casting port (12). The lower mold (2) is located between the upper mold (1) and the pusher base (3), and the upper mold (1), the lower mold (2) and the pusher base (3) are slidably connected by four sets of columns. Among them, a demolding cylinder (4) is connected to one side of the lower mold (2), a casting molding box (13), a push rod connecting box (15) and a connecting slider (14) are provided on the top of the lower mold (2), and the casting port (12) is connected to the casting molding box (13). Both sides of the casting molding box (13) are connected to exhaust boxes (16), and the exhaust boxes (16) are located between the upper mold (1) and the lower mold (2). A cylinder fixing frame (42) is connected between the demolding cylinder (4) and the lower mold (2). A telescopic shaft (41) is provided inside the demolding cylinder (4), and one end of the telescopic shaft (41) is connected to the connecting slider (14). Cooling inlet (7) and cooling outlet (6) are provided on the side of the upper mold (1) and the lower mold (2) away from the demolding cylinder (4). The upper mold (1) and the lower mold (2) are provided with an oil inlet (5) and a cooling inlet (7) on one side, and the upper mold (1) and the lower mold (2) are provided with a cooling outlet (6) and an oil outlet (8) on the side away from the oil inlet (5), and the oil inlet (5), the cooling inlet (7), the cooling outlet (6) and the oil outlet (8) are all connected to the casting molding box (13); The casting method includes the following steps: Step 1: Connect the casting port (12) of the upper mold (1) to the casting equipment, and connect the pusher base (3) to the cylinder assembly for die casting demolding. Then connect the oil inlet (5) and oil outlet (8) on the upper mold (1) and lower mold (2) to the oil tank storing hydraulic oil through pipelines, and connect the cooling inlet (7) and cooling outlet (6) to the refrigeration equipment through pipelines. Step 2: The aluminum casting liquid enters through the casting port (12), and then the main gating system (131) connected to the casting port (12) injects the aluminum casting liquid into the molding cavity (19) to form the preset casting shape. The aluminum casting liquid is injected at a slow speed. Step 3: When the aluminum casting liquid enters the molding cavity (19), the air inside it is discharged through the exhaust channel (132). When the aluminum casting liquid is filled in the molding cavity (19), the molding cavity (19) is kept under high pressure to force the aluminum casting liquid to solidify and form under pressure, and the pressure is maintained for a certain period of time. Step 4: The demolding cylinder (4) drives the push rod connecting box (15) connected to the connecting slider (14) to move. During the movement, the cast part is pushed out by the inclined guide rod (141) to complete the demolding. Step 5: Open the lower mold (2) and the upper mold (1), and eject the casting from the ejector pin (33) in the pusher base (3). Take out the casting and repeat the above steps to achieve continuous casting of automotive structural parts.

2. The casting method for a vehicle body structural component according to claim 1, characterized in that: The lower mold (2) is provided with two sets of translation slide rails (18) on its top, and the connecting slider (14) is slidably connected to the two sets of translation slide rails (18). The push rod connecting box (15) is connected to the top of the connecting slider (14).

3. The casting method for a vehicle body structural component according to claim 1, characterized in that: The push rod connecting box (15) is connected to a pusher box (17) at the end away from the connecting slider (14). The pusher box (17) is set inside the casting molding box (13). The casting molding box (13) is provided with a main gating channel (131), a pusher slide rail (133), and a molding cavity (19).

4. The casting method for a vehicle body structural component according to claim 3, characterized in that: The molding cavity (19) is located between the main gating system (131) and the pusher box (17). The main gating system (131) is connected to the molding cavity (19), and one end of the casting port (12) is connected to the main gating system (131). The pusher connecting box (15) is slidably connected to the pusher slide rail (133).

5. The casting method for a vehicle body structural component according to claim 1, characterized in that: The exhaust box (16) is formed by two sets of hollow blocks joined together by threads, and an exhaust block (161) is provided inside the exhaust box (16). Multiple exhaust channels (132) are provided inside the casting molding box (13), and the two ends of the exhaust channels (132) are respectively connected to the exhaust block (161) and the molding cavity (19).

6. The casting method for a vehicle body structural component according to claim 1, characterized in that: The push rod connecting box (15) is connected to five sets of guide rods (141), and one end of the guide rod (141) is inserted into the molding cavity (19). The five sets of guide rods (141) are parallel to each other, and the angle between the guide rod (141) and the push rod connecting box (15) is an acute angle.

7. The casting method for a vehicle body structural component according to claim 1, characterized in that: The pusher base (3) is provided with an upper ejector plate (31) and a lower ejector plate (32), and ejector pins (33) are connected in the upper ejector plate (31) and the lower ejector plate (32). A connecting column (34) is connected between the lower mold (2) and the pusher base (3).

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