A stripper structure of a press die

Abstract

The utility model discloses a kind of demolding structures of stamping die, including upper die and lower die, lower die includes lower die holder and female die, the top of female die is equipped with die cavity;The inside of lower die holder is equipped with vertical passageway, vertical passageway is equipped with one-time ejector rod and secondary ejector rod, one-time ejector rod is hollow structure, the top end of one-time ejector rod extends to die cavity, the outer wall of one-time ejector rod is equipped with vertical sliding slot, the inner wall of vertical passageway is equipped with the first convex ring matched with vertical sliding slot, the top end of secondary ejector rod is threaded in one-time ejector rod, the bottom end of secondary ejector rod is connected with driving device, the outer wall of secondary ejector rod is equipped with second convex ring, second convex ring and the bottom end of one-time ejector rod are connected with spring, which is sleeved in the outside of secondary ejector rod.The utility model discloses a kind of demolding structures of stamping die, by setting one-time ejector rod and secondary ejector rod cooperation, can disperse in two stages, greatly reduce the product deformation risk possibly brought by one-time ejecting, especially suitable for high requirement product such as deep cavity, thin wall.

Description

Technical Field

[0001] This utility model relates to a demolding structure for a stamping die. Background Technology

[0002] Stamping dies are essential equipment in industrial production for mass-producing metal sheet parts. During the stamping process, the material undergoes plastic deformation under the combined action of the punch and die to form the desired product shape. After forming, the product often tightly wraps around the punch or gets stuck in the die cavity, making it difficult to remove. Currently, the common demolding method is to install a stripper plate or ejection mechanism on the die.

[0003] However, existing ejection mechanisms can cause excessively concentrated ejection force during a single ejection of large, deep-cavity, or thin-walled products, easily leading to localized deformation, warping, or surface defects such as whitening or marks. Therefore, appropriate technical solutions are needed to address these issues. Summary of the Invention

[0004] To overcome the aforementioned deficiencies of the prior art, this utility model provides a demolding structure for a stamping die to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution of this utility model is to design a demolding structure for a stamping die, including an upper die and a lower die. The lower die includes a lower die base and a die cavity. The die cavity is located on the top of the lower die base, and the top of the die cavity has a mold cavity. The interior of the lower die base has a vertical channel, in which a primary ejector pin and a secondary ejector pin are provided. The primary ejector pin is a hollow structure, with its top end extending into the mold cavity, and its top surface flush with the bottom surface of the mold cavity. The outer wall of the primary ejector pin has a vertical groove, and the inner wall of the vertical channel has a first protruding ring that mates with the vertical groove. The secondary ejector pin is located below the primary ejector pin, and its top end passes through the primary ejector pin. The bottom end of the secondary ejector pin is connected to a driving device, and its outer wall has a second protruding ring. A spring sleeved on the outside of the secondary ejector pin is connected between the second protruding ring and the bottom end of the primary ejector pin.

[0006] Preferably, the bottom end of the vertical channel is provided with a sealing ring fitted onto the outside of the secondary top rod.

[0007] Preferably, both the primary push rod and the second convex ring are slidably engaged with the inner wall of the vertical channel, and the inner wall of the vertical channel is provided with a friction-reducing coating.

[0008] Preferably, the driving device is a hydraulic cylinder or a pneumatic cylinder.

[0009] Preferably, the upper mold includes an upper mold base and a punch, with the punch disposed at the bottom of the upper mold base.

[0010] The advantages and beneficial effects of this utility model are as follows: It provides a demolding structure for a stamping die, which has a reasonable structure. By setting a primary ejector pin and a secondary ejector pin in cooperation, the primary ejector pin first contacts the bottom of the product to provide the initial ejection force, breaking the vacuum adhesion between the product and the cavity wall of the die. Then the secondary ejector pin provides the main ejection force to completely eject the product. This method disperses the ejection force in two stages, which greatly reduces the risk of product deformation that may be caused by primary ejection. It is especially suitable for high-requirement products such as deep cavity and thin wall. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the present invention.

[0012] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0013] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0014] Reference numerals in the attached drawings: 1. Lower mold base; 2. Die cavity; 3. Mold cavity; 4. Vertical channel; 5. Primary ejector pin; 6. Secondary ejector pin; 7. Vertical groove; 8. First convex ring; 9. Second convex ring; 10. Spring; 11. Sealing ring. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0016] The specific technical solution of this utility model is as follows: In one specific embodiment, such as Figure 1 , Figure 2 and Figure 3As shown, this utility model provides a demolding structure for a stamping die, including an upper die and a lower die. The lower die includes a lower die base 1 and a die cavity 2. The die cavity 2 is disposed on the top of the lower die base 1, and the top of the die cavity 2 is provided with a mold cavity 3. The lower die base 1 has a vertical channel 4 inside, and a primary ejector pin 5 and a secondary ejector pin 6 are provided in the vertical channel 4. The primary ejector pin 5 has a hollow structure, and its top end extends into the mold cavity 3, and the top surface of the primary ejector pin 5 is flush with the mold cavity 3. The bottom surface is flush with the surface. The outer wall of the primary push rod 5 is provided with a vertical groove 7. The inner wall of the vertical channel 4 is provided with a first protruding ring 8 that cooperates with the vertical groove 7. The secondary push rod 6 is located below the primary push rod 5, and the top end of the secondary push rod 6 passes through the primary push rod 5. The bottom end of the secondary push rod 6 is connected to a driving device, and the outer wall of the secondary push rod 6 is provided with a second protruding ring 9. A spring 10 sleeved on the outside of the secondary push rod 6 is connected between the second protruding ring 9 and the bottom end of the primary push rod 5.

[0017] The working principle of the demolding structure of the stamping die of this utility model, adopting the above solution, is as follows: During ejection, the secondary ejector rod 6 is driven upward by the drive device, which in turn drives the primary ejector rod 5 upward via the spring 10. The primary ejector rod 5 applies an ejection force to the product, mainly to break the vacuum suction force and loosen the product initially, until the primary ejector rod 5 stops at the bottom of the vertical groove 7 above it, which is blocked by the first convex ring 8. The first ejection action is completed. Afterward, the drive device drives the secondary ejector rod 6 to continue upward, so that the top of the secondary ejector rod 6 gradually protrudes from the top surface of the primary ejector rod 5. The secondary ejector rod 6 applies a greater ejection force to the product, completely ejecting the product out of the mold cavity 3 of the die 2. The second ejection action is completed.

[0018] In another specific embodiment, such as Figure 1 and Figure 3 As shown, the bottom end of the vertical channel 4 is provided with a sealing ring 11 that is sleeved on the outside of the secondary push rod 6.

[0019] The above solution is adopted: a sealing ring 11 is installed to prevent dust from entering the vertical channel 4.

[0020] In another specific embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the primary push rod 5 and the second convex ring 9 are both slidably engaged with the inner wall of the vertical channel 4, and the inner wall of the vertical channel 4 is provided with a friction-reducing coating.

[0021] The above solution is adopted: by setting a friction-reducing coating, the friction between the primary push rod 5 and the second convex ring 9 and the inner wall of the vertical channel 4 is reduced, so that the primary push rod 5 and the second convex ring 9 can move smoothly.

[0022] In another specific embodiment, the driving device is a hydraulic cylinder or a pneumatic cylinder.

[0023] In another specific embodiment, the upper mold includes an upper mold base and a punch, the punch being disposed at the bottom of the upper mold base.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A demolding structure for a stamping die, comprising an upper die and a lower die, the lower die comprising a lower die base (1) and a die cavity (2), the die cavity (2) being disposed on the top of the lower die base (1), and the top of the die cavity (2) being provided with a mold cavity (3), characterized in that, The lower mold base (1) has a vertical channel (4) inside. The vertical channel (4) has a primary ejector rod (5) and a secondary ejector rod (6). The primary ejector rod (5) is a hollow structure. The top end of the primary ejector rod (5) extends into the mold cavity (3), and the top surface of the primary ejector rod (5) is flush with the bottom surface of the mold cavity (3). The outer wall of the primary ejector rod (5) has a vertical groove (7). The inner wall of the vertical channel (4) has a first convex ring (8) that cooperates with the vertical groove (7). The secondary ejector rod (6) is located below the primary ejector rod (5), and the top end of the secondary ejector rod (6) passes through the primary ejector rod (5). The bottom end of the secondary ejector rod (6) is connected to a driving device, and the outer wall of the secondary ejector rod (6) has a second convex ring (9). A spring (10) sleeved on the outside of the secondary ejector rod (6) is connected between the second convex ring (9) and the bottom end of the primary ejector rod (5).

2. The demolding structure of the stamping die according to claim 1, characterized in that, The bottom end of the vertical channel (4) is provided with a sealing ring (11) sleeved on the outside of the secondary top rod (6).

3. The demolding structure of the stamping die according to claim 1, characterized in that, The primary push rod (5) and the second convex ring (9) are both in sliding engagement with the inner wall of the vertical channel (4), and the inner wall of the vertical channel (4) is provided with a friction-reducing coating.

4. The demolding structure of the stamping die according to claim 1, characterized in that, The driving device is a hydraulic cylinder or a pneumatic cylinder.

5. The demolding structure of the stamping die according to claim 1, characterized in that, The upper mold includes an upper mold base and a punch, with the punch located at the bottom of the upper mold base.

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