Flexible compensation bending springback forming die and forming method

Abstract

The utility model relates to a kind of flexible compensation bending springback forming die and forming method, the utility model relates to a kind of forming die and forming method, the purpose of the utility model is to solve the problems of long repair cycle, high cost in prior art repeatedly test correction die surface, compensation to springback, fixed frame elastic pad is installed in the frame body of fixed frame, split female die is arranged in the frame body of fixed frame above fixed frame elastic pad, and elastic cladding layer is wrapped on the protruding working end of male die, and elastic cladding layer and male die are inserted in split female die.The plate is placed in split female die and the top of fixed frame;By the pressure mechanism, male die is driven to move downward and load to plate, and plate is deformed to target bending shape;Male die continues to load, and male die cladding layer occurs elastic deformation, so that plate occurs certain degree of overbending deformation;Male die moves upward and unloads, and completes processing and takes out bending forming piece.The utility model belongs to the field of metal plate processing forming.

Description

Technical Field

[0001] This invention relates to a forming mold and a forming method, specifically to a flexible compensating bending springback forming mold and a forming method. This invention belongs to the field of metal sheet processing and forming. Background Technology

[0002] Springback during sheet metal bending is a widespread problem that severely affects the dimensional and shape accuracy of formed parts. To address springback, two approaches are used: firstly, optimizing process parameters such as blank holder force, lubrication conditions, and sheet shape to control springback; and secondly, optimizing the die surface to compensate for springback. However, optimizing process parameters has limited effectiveness in controlling springback. Current technologies compensate for springback by repeatedly modifying the die surface through experimentation, but this process is time-consuming and costly. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of repeated testing and modification of mold surfaces in the prior art to compensate for springback, which results in long mold repair cycles and high costs. Therefore, this invention provides a flexible compensation bending springback forming mold and forming method.

[0004] The technical solution of this invention is: A flexible compensation bending springback forming die includes a punch, a punch elastic covering layer, a segmented die, a fixed frame elastic pad, and a fixed frame. The fixed frame elastic pad is installed inside the fixed frame, and the segmented die is set above the fixed frame elastic pad inside the fixed frame. The elastic covering layer wraps around the protruding working end of the punch, and the elastic covering layer and the punch are inserted into the segmented die.

[0005] Furthermore, the elastic coating layer includes a straight segment elastic coating layer and a circular arc segment elastic coating layer; The bottom of the punch has a shoulder. The bottom of the straight section elastic covering layer is fixedly connected to the arc section elastic covering layer. The straight section elastic covering layer and the arc section elastic covering layer wrap around the shoulder of the punch.

[0006] Furthermore, the segmented die is U-shaped, with a cavity inside the U-shape, and the bottom of the cavity is an arc-shaped surface.

[0007] Furthermore, the segmented die includes two half-die molds, which are arranged opposite each other to form a 'U' shape. Each half-die mold has a rotating pair machined on its outer side wall along the length direction. The rotating pair is rotatably connected to the inner side wall of the fixed frame.

[0008] Furthermore, the cross-section of the rotating pair is a larger arc than a semicircle, and the inner sidewall of the fixed frame is machined with a groove that mates with the rotating pair. The rotating pair is rotatably positioned within the groove of the fixed frame.

[0009] Furthermore, the material of the convex mold elastic covering layer is silicone rubber or polyurethane elastomer, and the material of the fixing frame elastic pad is silicone rubber or polyurethane elastomer.

[0010] Furthermore, the thickness of the elastic coating layer in the straight section and the elastic coating layer in the arc section are the same. The thickness of the elastic coating layer in the straight section ranges from 2 mm to 10 mm. The hardness of the elastic coating layer in the straight section is Shore A30 to Shore A50, and the hardness of the elastic coating layer in the arc section is Shore A50 to Shore A80.

[0011] Furthermore, the rotation angle of the split mold on the inner sidewall of the fixed frame is 2° to 10°.

[0012] Furthermore, the thickness of the elastic pad of the fixing frame is 10 mm to 15 mm, and the hardness of the elastic pad of the fixing frame is Shore A30 to Shore A50.

[0013] A forming method for a flexible compensating bending springback forming die, the method being implemented according to the following steps: Step 1: Place the sheet material on top of the segmented die and the fixing frame; Step 2: The punch is positioned directly above the split die. The pressing mechanism drives the punch downward and loads the sheet metal, causing it to deform into the target curved shape. Step 3: The punch continues to be loaded, causing the segmented die to rotate at a certain angle. The punch coating layer undergoes elastic deformation, causing the sheet metal to undergo a certain degree of excessive bending deformation, thus compensating for the springback. Step 4: The punch moves upward to unload, and the split die returns to its initial state under the action of the elastic pad of the fixed frame, completing the processing and removing the bent part.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The forming mold with adjustable surface flexibility and the corresponding forming method disclosed in this application make it easier to realize springback compensation of the formed parts and reduce the mold manufacturing cycle and cost.

[0015] 2. This application involves coating the surface of a rigid bending die with elastic silicone rubber or polyurethane. The rotation of the segmented die induces a certain degree of excessive bending in the sheet material. Combined with the elastic coating layer and elastic pad, the amount of excessive bending can be flexibly adjusted, thus achieving flexible compensation for bending springback. Therefore, this application can provide targeted compensation for different springback amounts caused by sheet materials with varying deformation properties and bending shapes; it provides flexible compensation for springback based on actual deformation and springback conditions, eliminating the need for repeated die modifications and significantly reducing die manufacturing cycle and costs. Attached Figure Description

[0016] Figure 1This is a front view of plate 3 placed before the structural processing of this application. In the figure, F is the applied force, and the solid arrow indicates the direction of the applied force F. Figure 2 This is a front view of the structural processing of plate 3 placed in this application; Figure 3 This is the main view of plate 3 after structural processing in this application; Figure 4 This is a front view of the sheet metal 3 after the punch 1 and the split die 4 are separated following the structural processing of the material in this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Specific implementation method one: Combining Figures 1-4 This embodiment describes a flexible compensation bending springback forming mold, which includes a punch 1, a punch elastic covering layer 2, a segmented die 4, a fixed frame elastic pad 5, and a fixed frame 6. The fixed frame elastic pad 5 is installed inside the frame of the fixed frame 6. The segmented die 4 is set above the fixed frame elastic pad 5 inside the frame of the fixed frame 6. The elastic covering layer 2 is wrapped around the protruding working end of the punch 1, and the elastic covering layer 2 and the punch 1 are inserted into the segmented die 4.

[0019] In this embodiment, the top of the segmented die 4 is lower than the top of the fixed frame 6. The sheet metal 3 is placed above the segmented die 4 and the fixed frame 6. The sheet metal 3 is pressed by the punch 1 and the punch elastic covering layer 2. The segmented die 4 rotates within the fixed frame 6, causing the sheet metal 3 to be formed by the segmented die 4, the fixed frame elastic pad 5, and the fixed frame 6. The material of the sheet metal 3 is aluminum alloy, copper alloy, stainless steel, or high-temperature alloy.

[0020] Specific Implementation Method Two: Combining Figures 1-4 This embodiment describes a flexible compensation bending springback forming mold, wherein the elastic covering layer 2 includes a straight segment elastic covering layer 21 and an arc segment elastic covering layer 22. The bottom of the punch 1 is machined with a shoulder. The bottom ends of the straight segment elastic covering layer 21 are fixedly connected to the arc segment elastic covering layer 22. The straight segment elastic covering layer 21 and the arc segment elastic covering layer 22 wrap around the shoulder of the punch 1. Other components and connections are the same as in Specific Embodiment 1.

[0021] Specific implementation method three: Combining Figures 1-4 This embodiment describes a flexible compensating bending and springback forming mold. The segmented concave mold 4 is U-shaped, with a cavity inside the U-shape, and the bottom of the cavity is an arc-shaped surface. Other components and connections are the same as in specific embodiment two.

[0022] Specific implementation method four: Combination Figures 1-4 This embodiment describes a flexible compensation bending springback forming mold. The segmented die 4 includes two half-die molds arranged opposite each other to form a 'U' shape. Each half-die mold has a rotating joint 41 machined along its length on its outer side wall. The rotating joint 41 is rotatably connected to the inner side wall of the fixed frame 6. Other components and connections are the same as in specific embodiment three.

[0023] Specific Implementation Method Five: Combining Figures 1-4 This embodiment describes a flexible compensating bending and springback forming mold. The cross-section of the rotating joint 41 is a larger arc than a semicircle. A groove is machined on the inner wall of the fixed frame 6 to mate with the rotating joint 41. The rotating joint 41 is rotatably disposed within the groove of the fixed frame 6. The split mold is rotated within the fixed frame 6 via the rotating joint 4-1. Other components and connections are the same as in specific embodiment four.

[0024] Specific Implementation Method Six: Combination Figures 1-4 This embodiment describes a flexible compensation bending springback forming mold. The material of the elastic covering layer 2 of the punch is silicone rubber or polyurethane elastomer, and the material of the elastic pad 5 of the fixing frame is silicone rubber or polyurethane elastomer. Other components and connections are the same as in specific embodiment one.

[0025] Specific implementation method seven: Combining Figures 1-4 This embodiment describes a flexible compensation bending springback forming mold. The straight segment elastic coating layer 21 and the arc segment elastic coating layer 22 have the same thickness. The thickness of the straight segment elastic coating layer 21 ranges from 2 mm to 10 mm, and its hardness is Shore A30 to Shore A50. The hardness of the arc segment elastic coating layer 22 is Shore A50 to Shore A80. Other components and connections are the same as in specific embodiment one.

[0026] Specific implementation method eight: Combination Figures 1-4 This embodiment describes a flexible compensating bending springback forming mold. The split mold rotates at an angle D on the inner sidewall of the fixed frame 6, where D ranges from 2° to 10°. Other components and connections are the same as in specific embodiments four or five.

[0027] Specific Implementation Method Nine: Combining Figures 1-4This embodiment describes a flexible compensating bending springback forming mold. The thickness of the fixed frame elastic pad 5 is 10 mm to 15 mm, and the hardness of the fixed frame elastic pad 5 is Shore A30 to Shore A50. Other components and connections are the same as in specific embodiment one.

[0028] Specific Implementation Method Ten: Combining Figures 1-4 This embodiment describes a forming method for a flexible compensation bending springback forming die, which is implemented according to the following steps: Step 1: Place the sheet material 3 on top of the segmented die 4 and the fixing frame 6; Step 2: The punch 1 is positioned directly above the split die 4. The punch 1 is driven downward by the pressure mechanism to load the sheet metal 3, causing the sheet metal 3 to deform into the target curved shape. Step 3: The punch 1 continues to be loaded, causing the split die 4 to rotate at a certain angle. The punch covering layer 2 undergoes elastic deformation, causing the sheet metal 3 to undergo a certain degree of excessive bending deformation, thereby compensating for the springback. Step 4: The punch 1 moves upward to unload, and the split die 4 returns to its initial state under the action of the elastic pad 5 of the fixed frame, completing the processing and taking out the bent part.

[0029] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A flexible compensating bending springback forming die, characterized in that: It includes a punch (1), a punch elastic covering layer (2), a segmented die (4), a fixed frame elastic pad (5), and a fixed frame (6); The fixed frame elastic pad (5) is installed in the frame of the fixed frame (6), and the segmented die (4) is set in the frame of the fixed frame (6) above the fixed frame elastic pad (5). The elastic covering layer (2) is wrapped around the protruding working end of the punch (1), and the elastic covering layer (2) and the punch (1) are inserted into the segmented die (4).

2. The flexible compensation bending springback forming die according to claim 1, characterized in that: The elastic covering layer (2) includes a straight segment elastic covering layer (21) and an arc segment elastic covering layer (22); The bottom of the punch (1) is machined with a shoulder. The bottom end of the straight section elastic covering layer (21) is fixedly connected to the arc section elastic covering layer (22). The straight section elastic covering layer (21) and the arc section elastic covering layer (22) are wrapped around the shoulder of the punch (1).

3. The flexible compensation bending springback forming die according to claim 1, characterized in that: The segmented die (4) is a 'U' shape, with a cavity inside the 'U' shape, and the bottom of the cavity is an arc surface.

4. The flexible compensation bending springback forming die according to claim 3, characterized in that: The split die (4) includes two split dies, which are arranged opposite each other to form a 'U' shape. Each split die has a rotating pair (41) machined on its outer side wall along the length direction. The rotating pair (41) is rotatably connected to the inner side wall of the fixed frame (6).

5. The flexible compensation bending springback forming die according to claim 4, characterized in that: The cross-section of the rotating pair (41) is a larger arc than a semicircle. The inner sidewall of the fixed frame (6) is machined with a groove that matches the rotating pair (41). The rotating pair (41) is rotatably set in the groove of the fixed frame (6).

6. The flexible compensation bending springback forming die according to claim 1, characterized in that: The material of the convex mold elastic covering layer (2) is silicone rubber or polyurethane elastomer, and the material of the fixed frame elastic pad (5) is silicone rubber or polyurethane elastomer.

7. The flexible compensation bending springback forming die according to claim 1, characterized in that: The straight segment elastic coating (21) and the arc segment elastic coating (22) have the same thickness. The thickness of the straight segment elastic coating (21) ranges from 2 mm to 10 mm. The hardness of the straight segment elastic coating (21) is Shore A30 to Shore A50, and the hardness of the arc segment elastic coating (22) is Shore A50 to Shore A80.

8. A flexible compensation bending springback forming die according to claim 4 or 5, characterized in that: The rotation angle of the split mold on the inner side wall of the fixed frame (6) is D, and the value of D is 2° to 10°.

9. A flexible compensating bending springback forming die according to claim 1, characterized in that: The thickness of the fixed frame elastic pad (5) is 10 mm to 15 mm, and the hardness of the fixed frame elastic pad (5) is Shore A30 to Shore A50.

10. A forming method using a flexible compensating bending springback forming die according to any one of claims 1 to 9, characterized in that: The method is implemented according to the following steps: Step 1: Place the sheet material (3) on top of the segmented die (4) and the fixing frame (6); Step 2: The punch (1) is set directly above the split die (4). The punch (1) is driven to move downward by the pressure mechanism and load the plate (3) so that the plate (3) is deformed into the target curved shape. Step 3: The punch (1) continues to be loaded, causing the split die (4) to rotate at a certain angle, and the punch covering layer (2) undergoes elastic deformation, causing the sheet metal (3) to undergo a certain degree of excessive bending deformation, thereby compensating for the springback. Step 4: The punch (1) moves upward to unload, and the split die (4) returns to its initial state under the action of the elastic pad (5) of the fixed frame, completing the processing and taking out the bent part.

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