Stamping die

Abstract

The utility model provides a stamping die, and belongs to the technical field of dies. The technical problem that an existing stamping die is insufficient in forming quality is solved. The stamping die comprises an upper female die and a lower male die, the top of the lower male die is sleeved with a blank holder, the bottom face of the upper female die is provided with a groove used for forming, and the stamping die is characterized in that a movable core part capable of vertically sliding is connected into the upper female die; the top of the movable core piece abuts against the upper female die in a limited mode, the bottom face of the movable core piece is a part of the smooth inner wall of the groove, and when the upper female die moves upwards relative to the blank holder, the movable core piece can move downwards relative to the upper female die. The stamping die can effectively improve the stamping quality of the workpiece.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a stamping mold. Background Art

[0002] With the rapid development of the automobile industry, competition in the mold industry has become more intense. For sheet metal parts, the main way to produce them is through stamping die processing. The stamping process has higher production efficiency than the casting process.

[0003] For example, a stamping die disclosed in the patent with authorization announcement number CN205816566U has a die and a punch matched with the die, a cavity is formed between the convex model surface of the punch and the concave model surface of the die, and a pressure ring is provided at the edge of the punch.

[0004] The above-mentioned stamping die can quickly produce sheet metal parts, but there are still some shortcomings: for sheet metal parts with large shape differences, during the stamping process, the area where the process part is opposite to the concave model surface on the die cannot obtain sufficient support from the concave model surface when the die is closed, which can easily cause wrinkles and overlap in the formed process part, resulting in insufficient forming quality. Summary of the invention

[0005] The utility model aims at the above problems existing in the prior art and provides a stamping die. The technical problem to be solved by the utility model is to improve the molding quality of process parts.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A stamping die comprises an upper die and a lower punch, the top of the lower punch being sleeved with a pressure ring, the bottom surface of the upper die having a groove for forming, and is characterized in that a movable core piece capable of vertical sliding is connected to the inner part of the upper die, the top of the movable core piece is limitedly abutted against the upper die and the bottom surface of the movable core piece is a part of the smooth inner wall of the groove, and when the upper die moves upward relative to the pressure ring, the movable core piece can move downward relative to the upper die.

[0008] The upper female die can be closed with the lower male die to stamp and form the workpiece in the cavity between the two. The blank holder can move vertically relative to the lower male die and cooperate with the upper female die to tightly press the edge of the workpiece in advance to ensure the forming quality. By connecting a vertically slidable movable core member in the upper female die and making the bottom surface of the movable core member participate in forming the inner wall of the groove, when the upper female die is separated from the blank holder, the movable core member can move downward relative to the upper female die. In this way, when the upper female die moves towards the workpiece on the blank holder during the stamping process, the movable core member extends downward to contact the area of the workpiece opposite to the groove in advance and can continuously provide support until the final forming. When reaching the forming position, the top of the movable core member is limited to ensure that the movable core member can finally generate sufficient pressure to form the workpiece in the groove, thereby avoiding the phenomena of wrinkles and overlapping materials in the middle area of the workpiece and effectively improving the stamping quality of the workpiece.

[0009] In the above stamping die, a support arm arranged in the up-and-down direction is connected to the outer side wall of the blank holder. The lower end of the support arm is hinged to the blank holder, and the upper end of the support arm extends beyond the top surface of the blank holder. A plurality of guide columns arranged in the up-and-down direction are fixedly connected to the outer periphery of the movable core member. The lower ends of the guide columns are supported on the top of the support arm, and the upper end of the support arm can swing away from the side where the groove is located and be misaligned with the lower ends of the guide columns. In this way, during the mold closing process, the upper end of the support arm can be controlled to swing and be misaligned with the guide columns first, so that the guide columns fixed to the movable core member will not be interfered by the support arm and can fully move downward, thereby continuously providing support to the middle part of the workpiece to avoid wrinkles and overlapping materials. Before finally in place, the support arm can gradually reset and provide support to the lower ends of the guide columns to ensure the stability of the cavity shape. When the upper female die moves upward relative to the lower male die during mold opening, the movable core member is still limited by the support arm to avoid over-pressing the formed workpiece. After the upper female die continues to move upward relative to the lower male die and the movable core member reaches the maximum stroke, it can move upward together with the upper female die. Then, the blank holder can be lifted relative to the lower male die to realize demolding, ensuring the stability of product quality.

[0010] In the above stamping die, a wear-resistant block is connected to the lower end of the guide column, and the wear-resistant block abuts against the support arm vertically. The wear-resistant block is an existing component, which is beneficial to extending the service life of mold opening and closing. At the same time, it is also convenient to replace and maintain at low cost after the wear-resistant block is worn, which is more economical.

[0011] In the above-mentioned stamping die, vertical columns are fixedly arranged on the lower punch in an up-and-down manner and are disposed around the blank holder. The upper end of the support arm always has a tendency to swing towards the vertical columns. The upper end of the vertical column is connected with a pushing block arranged towards the side where the support arm is located. The upper end of the support arm has a pressing portion protruding towards the side where the vertical column is located. The side surface of the pressing portion facing the vertical column is smoothly transitioned and abuts against the pushing block. The swinging tendency of the upper end of the support arm can be realized by arranging an elastic member between the support arm and the outer side wall of the blank holder or arranging a torsion spring at the hinged position of the support arm. In this way, when the blank holder moves upward relative to the lower punch, the pressing portion on the support arm gradually separates from the pushing block on the vertical column upwards, so that the upper end of the support arm without restraint begins to swing towards the side where the vertical column is located to be misaligned with the guide post, preparing for the subsequent mold closing; during the mold closing process, when the blank holder moves downward relative to the lower punch, the pressing portion moves downward relative to the vertical column and gradually contacts the pushing block, causing the support arm to reset and form an abutting support with the upper guide post, ensuring the stable position of the movable core part during mold opening.

[0012] In the above-mentioned stamping die, the upper end of the support arm also has a limiting portion protruding towards the side where the groove is located, and the limiting portion is supported on the blank holder. In this way, the limiting portion can provide a force support for the entire support arm when being pressed during mold closing, avoiding excessive load on the hinged position during stamping, and being beneficial to extending the service life of the die.

[0013] In the above-mentioned stamping die, a roller capable of rolling along the surface of the support arm is connected to the pushing block when the blank holder and the lower punch move relative to each other. In this way, it is beneficial to further reduce the resistance during the movement of the pushing block along the surface of the support arm, making the mold opening and closing actions smooth and reducing the scratching between components, which is beneficial to extending the service life of the die.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] During the stamping process of this stamping die, the movable core part extends downward to contact in advance the area on the workpiece opposite to the groove, and can continuously provide support until the final forming, which is beneficial to avoiding the phenomena of wrinkles and overlapping materials in the middle area of the workpiece and effectively improving the stamping quality of the workpiece. Brief Description of the Drawings

[0016] Figure 1 is the three-dimensional structural schematic diagram of this embodiment.

[0017] Figure 2 is the top-view structural schematic diagram of this embodiment.

[0018] Figure 3 is Figure 2 the schematic cross-sectional view taken along A-A in

[0019] Figure 4 is Figure 3Enlarged view of part B in

[0020] Figure 5 It is a schematic three-dimensional structure diagram when the mold is opened in this embodiment.

[0021] Figure 6 It is a schematic three-dimensional structure diagram of the state where the movable core part in the upper female mold moves downward in this embodiment.

[0022] In the figure, 1 is the upper female mold; 11 is the groove;

[0023] 2 is the lower male mold; 3 is the blank holder; 4 is the movable core part;

[0024] 5 is the support arm; 51 is the pressing part; 52 is the limiting part;

[0025] 6 is the guide post; 7 is the wear-resistant block; 8 is the column;

[0026] 9 is the pushing block; 91 is the roller. Detailed implementation manners

[0027] The following are specific embodiments of the present invention and, in conjunction with the accompanying drawings, further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0028] Such as Figures 1-6As shown in the figure, this stamping die includes an upper female die 1 and a lower male die 2. A blank holder 3 is sleeved on the top of the lower male die 2. The vertical drive of the upper female die 1 and the blank holder 3 is realized by the prior art. The bottom surface of the upper female die 1 has a groove 11 for forming. A movable core member 4 that can slide vertically is connected inside the upper female die 1. The top of the movable core member 4 is in limiting contact with the upper female die 1, and the bottom surface of the movable core member 4 is a part of the smooth inner wall of the groove 11. When the upper female die 1 moves upward relative to the blank holder 3, the movable core member 4 can move downward relative to the upper female die 1. Specifically, a support arm 5 arranged in the up-and-down direction is connected to the outer side wall of the blank holder 3. The lower end of the support arm 5 is hinged to the blank holder 3. The upper end of the support arm 5 extends beyond the top surface of the blank holder 3. A plurality of guide columns 6 arranged in the up-and-down direction are fixedly connected to the outer periphery of the movable core member 4. The lower ends of the guide columns 6 are supported on the top of the support arm 5. The upper end of the support arm 5 can swing away from the side where the groove 11 is located and is misaligned with the lower ends of the guide columns 6. Preferably, a wear-resistant block 7 is connected to the lower end of the guide column 6. The wear-resistant block 7 is in contact with the support arm 5 in the vertical direction. The wear-resistant block 7 is a prior art component. Further, vertical columns 8 arranged up and down and located outside the blank holder 3 are fixedly provided on the lower male die 2. A spring member is provided between the support arm 5 and the outer side wall of the blank holder 3 so that the upper end of the support arm 5 always has a tendency to swing towards the vertical column 8. The upper end of the vertical column 8 is connected with a pushing block 9 arranged towards the side where the support arm 5 is located. The upper end of the support arm 5 has a pressing portion 51 protruding towards the side where the vertical column 8 is located. The side surface of the pressing portion 51 facing the vertical column 8 is smoothly transitioned and is in contact with the pushing block 9. Preferably, the upper end of the support arm 5 also has a limiting portion 52 protruding towards the side where the groove 11 is located. The limiting portion 52 is supported on the blank holder 3. Two rollers 91 that can roll along the surface of the support arm 5 are connected to the pushing block 9 when the blank holder 3 and the lower male die 2 move relative to each other.

[0029] Working process: In the mold opening state, the blank holder 3 is in an upwardly lifted state relative to the lower punch 2, and there is a vertical gap between the upper die cavity 1 and the blank holder 3. The workpiece is loaded and positioned at the top of the blank holder 3. Then, the upper die cavity 1 drives the movable core member 4 to start closing the mold downward. During this process, the bottom of the movable core member 4 and the bottom surface of the upper die cavity 1 respectively contact the workpiece positioned and placed on the blank holder 3. The bottom surface of the upper die cavity 1 and the blank holder 3 clamp the edge of the workpiece, and the movable core member 4 provides top support for the area of the workpiece opposite to the groove 11. Then, the upper die cavity 1 continues to move downward synchronously with the blank holder 3, and the top of the movable core member 4 forms a limiting abutment with the upper die cavity 1, finally reaching the mold closing state, so that the workpiece is stamped and formed between the upper die cavity 1 and the lower punch 2. When the blank holder 3 moves toward the lower punch 2, the upper end of the support arm 5 on the outside of the blank holder 3 swings inward and finally supports the lower end of the guide post 6 fixedly connected to the outer periphery of the movable core member 4; when opening the mold to take out the workpiece, the upper die cavity 1 starts to move upward, and the movable core member 4 is supported by the support arm 5 and remains stationary to avoid applying excessive pressure on the formed workpiece. After the upper die cavity 1 continues to move upward for a certain distance, it can drive the movable core member 4 to move upward synchronously. Thereafter, the blank holder 3 can drive the formed workpiece to be lifted upward relative to the lower punch 2, reset to the mold opening state, and at the same time, the formed workpiece can be taken out.

[0030] The specific embodiments described herein are only illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A stamping die, comprising an upper die (1) and a lower die (2), wherein the top of the lower die (2) is sleeved with a blank holder (3), and the bottom surface of the upper die (1) has a groove (11) for forming, characterized in that: The upper die (1) is internally connected with a movable core piece (4) that can slide vertically. The top of the movable core piece (4) is limitedly abutted against the upper die (1) and the bottom surface of the movable core piece (4) is a part of the smooth inner wall of the groove (11). When the upper die (1) moves upward relative to the pressure ring (3), the movable core piece (4) can move downward relative to the upper die (1).

2. The stamping die according to claim 1, characterized in that: The outer wall of the pressure ring (3) is connected to a support arm (5) arranged in the up-down direction, the lower end of the support arm (5) is hinged on the pressure ring (3), the upper end of the support arm (5) exceeds the top surface of the pressure ring (3), the outer periphery of the movable core (4) is fixedly connected to a plurality of guide columns (6) arranged in the up-down direction, the lower end of the guide column (6) is supported on the top of the support arm (5), and the upper end of the support arm (5) can swing toward the side away from the groove (11) and be offset from the lower end of the guide column (6).

3. The stamping die according to claim 2, characterized in that: The lower end of the guide column (6) is connected to a wear-resistant block (7), and the wear-resistant block (7) abuts against the support arm (5) in the vertical direction.

4. The stamping die according to claim 2, characterized in that: The lower punch (2) is fixedly provided with a column (8) which is arranged up and down and arranged on the periphery of the pressure ring (3); the upper end of the support arm (5) always has a tendency to swing toward the column (8); the upper end of the column (8) is connected to a push block (9) arranged toward the side where the support arm (5) is located; the upper end of the support arm (5) has a clamping portion (51) protruding toward the side where the column (8) is located; the clamping portion (51) smoothly transitions toward the side of the column (8) and abuts against the push block (9).

5. The stamping die according to claim 2, characterized in that: The upper end of the support arm (5) also has a limiting portion (52) protruding toward the side where the groove (11) is located, and the limiting portion (52) is supported on the pressure ring (3).

6. The stamping die according to claim 4, characterized in that: The push block (9) is connected to a roller (91) which can roll along the surface of the support arm (5) when the blank holder (3) and the lower punch (2) move relative to each other.

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