Convex hull shrinkage die

Abstract

The utility model relates to the technical field of dies, in particular to a convex hull shrinkage die which comprises an upper die base, a lower die base, an upper nitrogen spring, a limiting drag hook, a stripper plate, a convex hull shrinkage die, a concave hull shrinkage die, a pressing plate, a supporting plate, an edge pressing plate and a lifting plate. The blank pressing plate is elastically connected with the lower die base through a first lower nitrogen spring, the lower jacking column is elastically connected with the lower die base through a second lower nitrogen spring, the material lifting plate is elastically connected with the lower die base through a third lower nitrogen spring, the material lifting plate is provided with a lifting cavity and a material passing groove, and the material pressing plate is elastically connected with the bottom wall of the lifting cavity through an elastic piece. A material passing gap is formed between the material supporting plate and the material pressing plate. According to the device, the package shrinking convex mold and the convex hull are demolded through the material pressing plate, and the package shrinking concave mold and the convex hull are demolded through cooperative cooperation of the material lifting plate and the lower ejection column, so that the inclination of a material belt is not caused during mold closing, indentations in the convex hull are not caused, demolding is stable, and the demolding quality is good.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a convex hull shrinkage mold. Background Art

[0002] In the continuous die, the process of initial stretching and then shrinking stretching is a common process in stamping dies. In the demoulding problem of shrinking stretching, basically an upper ejector is set on the shrinking punch and a lower ejector is set in the shrinking die. The upper and lower ejectors are used to meet the demoulding of the convex hull after forming. The defect of demoulding through the ejector is that the upper ejector is easy to tilt the material strip when closing the mold, causing the material strip to deform, and the upper ejector is easy to cause indentation in the convex hull, resulting in reduced product quality.

[0003] Among the existing patents, the Chinese patent document with application number 201721599628.3 discloses a convex shrinkage trimming die on a thin plate, including an upper die seat and a lower die seat, an upper mounting seat is mounted on the upper die seat, a plurality of nitrogen springs are arranged between the upper die seat and the upper mounting seat, an upper forming block for forming a convex bulge in the middle is arranged on the upper mounting seat, a forming groove is arranged on the upper forming block, an upper pressing block is arranged on the upper mounting seat on the outer sleeve of the upper forming block, at least two floating pressing pins are arranged on the upper mounting seat, and through holes for floating pressing pins to pass through are arranged on the upper mounting seat and the upper pressing block; a lower forming block for forming a convex bulge in the middle is arranged on the lower die seat, a lower forming surface is arranged on the lower forming block, a lower supporting block is arranged on the outer sleeve of the lower forming block on the lower die seat, a pair of positioning blocks are arranged on the outer periphery of the lower supporting block on the lower die seat, and a positioning notch is arranged on the positioning block to match the positioning ear on the workpiece. Although the structure of the patent document is simple, demoulding is difficult and the demoulding stability is poor. Therefore, the defects are very obvious, and a solution is urgently needed. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a convex hull shrinking die.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A convex shrinking mold, which includes an upper mold base, a lower mold base arranged opposite to the upper mold base, an upper nitrogen spring installed on the upper mold base, a limit hook installed on the bottom surface of the upper mold base, a stripping plate connected to the limit hook and connected to the upper nitrogen spring by lifting and sliding, a shrinking convex mold installed on the stripping plate, a shrinking concave mold installed on the top surface of the lower mold base and used for concave-convex cooperation with the shrinking convex mold, a pressure plate lifted and sleeved outside the shrinking concave mold, and a lifting plate lifted and arranged above the pressure plate, the bottom wall of the shrinking concave mold is provided with a through hole, a lower ejector column is slidably connected in the through hole, the lower ejector column can be moved into the through hole or extended into the concave cavity of the shrinking concave mold, the pressure plate It is elastically connected to the lower die base via the first lower nitrogen spring, the lower push column is elastically connected to the lower die base via the second lower nitrogen spring, the lifting plate is elastically connected to the lower die base via the third lower nitrogen spring, the lifting plate is sequentially provided with a connecting lifting chamber and a feeding trough from top to bottom, a pressing plate is provided in the lifting chamber for lifting, the pressing plate is elastically connected to the bottom wall of the lifting chamber via an elastic member, a supporting plate is convexly provided on the bottom wall of the lifting chamber, and the supporting plate is located on the side of the feeding trough; when the elastic member is in an extended state, a feeding gap is provided between the supporting plate and the pressing plate; the pressing plate is provided with a through hole, the shrinking package punch can penetrate the through hole, and the shrinking package die and the feeding trough are provided correspondingly.

[0007] Furthermore, a guide groove is concavely provided on the top surface of the supporting plate.

[0008] Furthermore, a limit plate is installed on the top surface of the lifting plate, and the limit plate is used to limit the pressing plate in the lifting cavity.

[0009] Furthermore, the stripping plate is provided with a positioning column, and the supporting plate is provided with a positioning hole, and the positioning column can slide through the pressing plate and then be inserted into the positioning hole.

[0010] Furthermore, a limit block is installed on the top surface of the lower die seat, and the limit block is used to resist the lifting plate.

[0011] Furthermore, a pressing insert is provided on the top surface of the pressing plate, and the pressing insert is located on the outer side of the shrinking die, and the pressing insert can extend into the material chute.

[0012] The beneficial effects of the utility model are as follows: in practical application, at the beginning, the upper die seat and the lower die seat are in an open die state, the upper nitrogen spring is in an extended state, the limit hook limits the stripping plate, the first lower nitrogen spring, the second lower nitrogen spring, the third lower nitrogen spring and the elastic member are all in an extended state, the lower ejector column extends into the inner cavity of the shrinking die, the material strip with an opening facing upward can move in the material trough, the supporting plate supports the edge of the material strip, and when the convex bump on the material strip moves to correspond to the shrinking convex die, the upper die seat moves downward and gradually aligns with the lower die The lower die seat is closed, the shrinking punch penetrates the perforation of the pressure plate, and the stripping plate first applies downward pressure to the pressure plate, so that the pressure plate moves downward along the lifting cavity relative to the lifting plate, until the pressure plate presses part of the edge of the material strip on the supporting plate, and the shrinking punch extends into the convex package of the material strip. As the lower die seat continues to move downward, the downward pressure acts on the lifting plate through the pressure plate, causing the lifting plate to move downward and compress the third lower nitrogen spring. The downward lifting plate will apply downward pressure to the edge holding plate, so that the edge holding plate can press the remaining edge of the material strip on the pressure plate while the edge holding plate moves downward. The first lower nitrogen spring is compressed, and the convex bump on the material strip gradually enters the shrinking die. Under the cooperation of the shrinking die and the shrinking die, the convex bump on the material strip is shrink-stretched, and the lower ejector column moves down along the through hole and compresses the second lower nitrogen spring until the upper die seat and the lower die seat are in a completely molded state. The upper die seat can move down relative to the stripping plate, and the upper nitrogen spring is compressed and provides a reverse force (shrinkage and stretching forming force), so that the convex bump on the material strip is completed with shrinkage and stretching forming; finally, during the process of opening the upper die seat and the lower die seat, , the shrinking punch moves upward, and under the limiting action of the pressure plate, the convex bulge after shrinkage and stretching forming will be demolded from the shrinking punch, and the lifting plate drives the convex bulge after shrinkage and stretching forming to be demolded from the shrinking die under the action of the rebound force of the third lower nitrogen spring. At the same time, the lower ejector column moves upward under the action of the rebound force of the second lower nitrogen spring and extends into the shrinking die, so that the lower ejector column demolds the convex bulge after shrinkage and stretching forming from the shrinking die upward, thereby making the convex bulge after shrinkage and stretching forming able to be demolded stably, ensuring the quality of the convex bulge after shrinkage and stretching forming. The utility model improves the quality of shrinkage and stretching forming of the bulge by first pressing the material and then shrinking and stretching it, and demolds the shrinkage convex mold from the bulge after shrinkage and stretching forming by using the material pressing plate, and cooperates with the material lifting plate and the lower push column to demold the shrinkage die from the bulge after shrinkage and stretching forming. Compared with the method of using the upper push column to demold the shrinkage convex mold from the bulge after shrinkage and stretching forming in the prior art, the upper push column is easy to push the material belt tilted or cause indentations in the bulge when the mold is closed. The upper push column does not need to be set on the shrinkage convex mold of the present application, and will not cause the material belt to be skewed or cause indentations in the bulge when the mold is closed, and the demolding is stable and the demolding quality is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the utility model in a mold opening state.

[0014] Figure 2 It is a cross-sectional view of the utility model in a mold closing state.

[0015] Figure 3 It is a schematic diagram of the three-dimensional structure of the convex bump on the material strip before and after shrinkage stretching forming in this embodiment.

[0016] Description of reference numerals:

[0017] 1. Upper die base; 2. Lower die base; 3. Upper nitrogen spring; 4. Limiting hook; 5. Stripping plate; 6. Shrinking punch; 7. Shrinking die; 8. Edge pressing plate; 9. Lifting plate; 10. Through hole; 11. Lower ejector column; 12. First lower nitrogen spring; 13. Second lower nitrogen spring; 14. Third lower nitrogen spring; 15. Lifting chamber; 16. Feed trough; 17. Pressing plate; 18. Elastic part; 19. Supporting plate; 20. Feeding gap; 21. Guide groove; 22. Limiting plate; 23. Limiting block; 24. Edge pressing insert; 25. Material strip. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0019] like Figures 1 to 3 As shown, the utility model provides a convex shrinking mold, which includes an upper mold base 1, a lower mold base 2 arranged opposite to the upper mold base 1, an upper nitrogen spring 3 installed on the upper mold base 1, a limiting hook 4 installed on the bottom surface of the upper mold base 1, a stripping plate 5 connected to the limiting hook 4 and connected to the upper nitrogen spring 3 by lifting and sliding, a shrinking convex mold 6 installed on the stripping plate 5, a shrinking die 7 installed on the top surface of the lower mold base 2 and used for concave-convex cooperation with the shrinking convex mold 6, a pressure plate 8 lifted and sleeved on the outside of the shrinking die 7 and a lifting plate 9 lifted and arranged above the pressure plate 8, the bottom wall of the shrinking die 7 is provided with a through hole 10, and a lower push column 11 is slidably connected in the through hole 10, the lower push column 11 can be moved into the through hole 10 or extended into the concave cavity of the shrinking die 7, and the pressure plate 8 is lifted and sleeved on the outside of the shrinking die 7 and the lifting plate 9 is lifted and arranged above the pressure plate 8, the bottom wall of the shrinking die 7 is provided with a through hole 10, and a lower push column 11 is slidably connected in the through hole 10, and the lower push column 11 can be moved into the through hole 10 or extended into the concave cavity of the shrinking die 7, and the pressure plate 8 is lifted and sleeved on the outside of the shrinking die 7 and the lifting plate 9 is lifted and arranged above the pressure plate 8, A lower nitrogen spring 12 is elastically connected to the lower die base 2, the lower ejector column 11 is elastically connected to the lower die base 2 via a second lower nitrogen spring 13, the lifting plate 9 is elastically connected to the lower die base 2 via a third lower nitrogen spring 14, the lifting plate 9 is sequentially provided with a connecting lifting chamber 15 and a feeding trough 16 from top to bottom, a pressing plate 17 is provided for lifting in the lifting chamber 15, the pressing plate 17 is elastically connected to the bottom wall of the lifting chamber 15 via an elastic member 18, a supporting plate 19 is convexly provided on the bottom wall of the lifting chamber 15, and the supporting plate 19 is located on the side of the feeding trough 16; when the elastic member 18 is in an extended state, a feeding gap 20 is provided between the supporting plate 19 and the pressing plate 17; the pressing plate 17 is provided with a through hole, the shrinking punch 6 can penetrate the through hole, and the shrinking die 7 is provided corresponding to the feeding trough 16.

[0020] In practical application, at the beginning, the upper die base 1 and the lower die base 2 are in the open mold state, the upper nitrogen spring 3 is in the extended state, the limit hook 4 limits the stripping plate 5, the first lower nitrogen spring 12, the second lower nitrogen spring 13, the third lower nitrogen spring 14 and the elastic member 18 are all in the extended state, the lower ejector column 11 extends into the inner cavity of the shrinking die 7, and the material belt 25 with the convex package opening facing upward can move in the material trough 16, and the supporting plate 19 supports the edge of the material belt 25. When the convex package on the material belt 25 moves to correspond to the shrinking punch 6, the upper die base 1 moves down and gradually closes the mold with the lower die base 2, and the shrinking is completed. The punch 6 penetrates the through hole of the pressure plate 17, and the stripper plate 5 first applies downward pressure to the pressure plate 17, so that the pressure plate 17 moves downward along the lifting cavity 15 relative to the lifting plate 9, until the pressure plate 17 presses part of the edge of the material strip 25 against the supporting plate 19, and the shrinking punch 6 extends into the convex package of the material strip 25. As the lower die seat 2 continues to move downward, the downward pressure acts on the lifting plate 9 through the pressure plate 17, so that the lifting plate 9 moves downward and compresses the third lower nitrogen spring 14. The downwardly moved lifting plate 9 will apply downward pressure to the edge pressing plate 8, so that the edge pressing plate 8 can press the remaining edge of the material strip 25 against the pressure plate 17. The edge holding plate 8 moves downward and compresses the first lower nitrogen spring 12, and the convex bump on the material strip 25 gradually enters the shrinking die 7. Under the cooperation of the shrinking die 6 and the shrinking die 7, the convex bump on the material strip 25 is shrink-stretched and formed, and the lower ejector column 11 moves downward along the through hole 10 and compresses the second lower nitrogen spring 13 until the upper die base 1 and the lower die base 2 are in a completely molded state, the upper die base 1 can move downward relative to the stripping plate 5, the upper nitrogen spring 3 is compressed and provides a reverse force (shrinkage and stretching forming force), so that the convex bump on the material strip 25 completes the shrinkage and stretching forming; finally, the upper die base 1 and the lower die base During the mold opening process, the shrinking punch 6 moves upward, and under the limiting action of the pressure plate 17, the convex bulge after shrinkage stretching molding will be demolded from the shrinking punch 6, and the lifting plate 9 drives the convex bulge after shrinkage stretching molding to be demolded from the shrinking die 7 under the action of the rebound force of the third lower nitrogen spring 14. At the same time, the lower push column 11 moves upward under the action of the rebound force of the second lower nitrogen spring 13 and extends into the shrinking die 7, so that the lower push column 11 demolds the convex bulge after shrinkage stretching molding from the shrinking die 7 upward, so that the convex bulge after shrinkage stretching molding can be demolded stably, ensuring the quality of the convex bulge after shrinkage stretching molding.The utility model improves the quality of shrinkage and stretching forming of the bulge by first pressing the material and then shrinking and stretching it, and demolds the shrinkage punch 6 from the bulge after shrinkage and stretching forming by the material pressing plate 17, and cooperates with the material lifting plate 9 and the lower push column 11 to demold the shrinkage die 7 from the bulge after shrinkage and stretching forming. Compared with the method of using an upper push column to demold the shrinkage punch 6 from the bulge after shrinkage and stretching forming in the prior art, the upper push column is easy to push the material strip 25 tilted or cause an indentation in the bulge when the mold is closed. The shrinkage punch 6 of the present application does not need to be provided with an upper push column, and will not cause the material strip 25 to be skewed or cause an indentation in the bulge when the mold is closed, and the demolding is stable and the demolding quality is good.

[0021] In this embodiment, the top surface of the support plate 19 is concavely provided with a guide groove 21. After the mold is opened, the flange of the material strip 25 can move along the guide groove 21, so that the convex bumps at different positions on the material strip 25 can be shrink-stretched and formed.

[0022] In this embodiment, a limit plate 22 is installed on the top surface of the lifting plate 9, and the limit plate 22 is used to limit the pressing plate 17 in the lifting chamber 15. This structural design improves the working stability of the pressing plate 17 and prevents the pressing plate 17 from escaping from the lifting chamber 15.

[0023] In this embodiment, the stripper plate 5 is equipped with a positioning post, and the support plate 19 is provided with a positioning hole, and the positioning post can slide through the press plate 17 and then be inserted into the positioning hole. When the mold is closed, the positioning post can penetrate the process hole at the edge of the material strip 25 and then be inserted into the positioning hole to position the material strip 25 and prevent the material strip 25 from being offset when the mold is closed.

[0024] In this embodiment, a limit block 23 is installed on the top surface of the lower die base 2, and the limit block 23 is used to resist the lifting plate 9. The limit block 23 limits the downward movement of the lifting plate 9, ensuring the position accuracy of the downward movement of the lifting plate 9.

[0025] In this embodiment, a pressing insert 24 is provided on the top surface of the pressing plate 8, and the pressing insert 24 is located outside the shrinking die 7, and the pressing insert 24 can extend into the material trough 16. By adding the pressing insert 24 to press the edge of the material strip 25, the contact area of ​​the edge of the pressed material strip 25 is increased as much as possible, and the quality of shrinkage stretching of the convex bulge of the material strip 25 is improved.

[0026] All technical features in this embodiment can be freely combined according to actual needs.

[0027] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A convex hull shrinkage die, characterized in that: The invention comprises an upper die base (1), a lower die base (2) arranged opposite to the upper die base (1), an upper nitrogen spring (3) mounted on the upper die base (1), a limit hook (4) mounted on the bottom surface of the upper die base (1), a stripper plate (5) connected to the limit hook (4) and connected to the upper nitrogen spring (3) by lifting and sliding, a shrinking punch (6) mounted on the stripper plate (5), and a convex-concave mold (6) mounted on the top surface of the lower die base (2) and used for concave-convex matching with the shrinking punch (6). The shrinking die (7) is combined with a shrinking die (7), a pressure plate (8) which is lifted and sleeved outside the shrinking die (7), and a lifting plate (9) which is lifted and arranged above the pressure plate (8). The bottom wall of the shrinking die (7) is provided with a through hole (10), and a lower push column (11) is slidably connected in the through hole (10). The lower push column (11) can move into the through hole (10) or extend into the concave cavity of the shrinking die (7). The pressure plate (8) is connected to the shrinking die (7) via a first lower nitrogen spring (12). The lower die base (2) is elastically connected, the lower ejector column (11) is elastically connected to the lower die base (2) via a second lower nitrogen spring (13), the material lifting plate (9) is elastically connected to the lower die base (2) via a third lower nitrogen spring (14), the material lifting plate (9) is sequentially provided with a lifting chamber (15) and a material passing trough (16) connected from top to bottom, a material pressing plate (17) is provided in the lifting chamber (15) for lifting, and the material pressing plate (17) is connected to the lifting chamber (15) via an elastic member (18). The bottom wall of the descending chamber (15) is elastically connected, and a supporting plate (19) is protruding from the bottom wall of the ascending and descending chamber (15), and the supporting plate (19) is located on the side of the material passing trough (16); when the elastic member (18) is in an extended state, a material passing gap (20) is provided between the supporting plate (19) and the pressing plate (17); the pressing plate (17) is provided with a through hole, and the shrinking convex mold (6) can pass through the through hole, and the shrinking concave mold (7) is correspondingly arranged with the material passing trough (16).

2. A convex hull shrinkage die according to claim 1, characterized in that: A guide groove (21) is concavely provided on the top surface of the supporting plate (19).

3. A convex hull shrinkage die according to claim 1, characterized in that: A limiting plate (22) is installed on the top surface of the material lifting plate (9), and the limiting plate (22) is used to limit the material pressing plate (17) in the lifting chamber (15).

4. The convex hull shrinking die according to claim 1, characterized in that: The stripping plate (5) is provided with a positioning column, and the supporting plate (19) is provided with a positioning hole. The positioning column can slide through the pressing plate (17) and then be inserted into the positioning hole.

5. The convex hull shrinking die according to claim 1, characterized in that: A limit block (23) is installed on the top surface of the lower die seat (2), and the limit block (23) is used to resist the lifting plate (9).

6. The convex hull shrinking die according to claim 1, characterized in that: The top surface of the edge pressing plate (8) is provided with an edge pressing insert (24), which is located outside the shrinking die (7) and can extend into the material trough (16).

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