A structure for cutting corner of drawing die
By introducing a chamfering structure of upper and lower trimming blades into the drawing die, the problems of cracking and wrinkling caused by obstructed material flow are solved, and uniform material flow and stable forming are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 燕龙世润汽车零部件(苏州)有限公司
- Filing Date
- 2025-06-17
- Publication Date
- 2026-06-02
AI Technical Summary
In drawing dies, when the drawing depth is large or the part shape is complex, the material flow is obstructed, which can easily lead to cracking and wrinkling.
Design a corner-cutting structure for a drawing die. By cooperating with the upper and lower trimming blades, corners are cut during the forming process, releasing material stress, redistributing the material flow path and stress field, and combining the scrap channel and fixing structure to ensure stable movement of the upper die assembly and precise control of the die closing position.
It effectively solves the problems of cracking and wrinkling in the deep drawing process, promotes uniform material flow, and improves molding quality.
Smart Images
Figure CN224309456U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold design and manufacturing technology, specifically to a corner cutting structure for a drawing die. Background Technology
[0002] Deep drawing is a machining process that uses dies to press a blank of a certain shape obtained after blanking into various open hollow parts or to reduce the diameter and increase the height of an open hollow blank. It is also known as deep drawing. Deep drawing can be used to manufacture thin-walled parts of cylindrical, stepped, conical, spherical, box-shaped and other irregular shapes. The dies used mainly consist of an upper die assembly, a lower die assembly and a blank holder.
[0003] In drawing die design, when the drawing depth is large or the part shape is complex (such as sharp corners or steep sidewalls), the material flow is obstructed, and excessive local stretching leads to cracking. When the blank holder cannot completely suppress the material flow, material accumulation may occur, resulting in wrinkling.
[0004] Based on this, the present invention designs a corner-cutting structure for a drawing die to solve the above problems. Utility Model Content
[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a corner-cutting structure for drawing dies.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A corner-cutting structure for a drawing die includes a die base and a drawing die. The drawing die includes an upper die assembly, a lower die assembly, and a blank holder. The upper die assembly includes an upper die seat and a die cavity, with the die cavity fixed to the bottom end of the upper die seat. The lower die assembly includes a lower die seat and a punch, with the punch fixed to the lower die seat. The blank holder is disposed above the lower die seat. Upper trimming cutters are symmetrically fixed to the bottom edge of the die cavity, and lower trimming cutters are fitted and fixed to the blank holder. One edge of the upper trimming cutter and one edge of the lower trimming cutter are located on the same vertical plane.
[0008] Furthermore, the lower mold base has symmetrical through slots on both sides of the center of one side, and a waste channel is fixed in the through slot.
[0009] Furthermore, four sets of large isolation discs are symmetrically installed on the outer walls of the mold base and the upper mold base, and four sets of small isolation discs are symmetrically installed on the outer wall of the lower mold base.
[0010] Furthermore, a long fixing plate is fixed on the side wall of the mold base, and two sets of mounting grooves are symmetrically opened on the side wall of the lower mold base. A short fixing plate is fixed on the inner wall of the mounting groove, and fixing screw holes are opened on the short fixing plate, the lower mold base and the long fixing plate.
[0011] Furthermore, a guide post is fixed at the center of the bottom end of the mounting groove, and a mounting block is provided at the bottom end of the upper mold base to cooperate with the mounting groove. A guide hole is provided at the bottom end of the mounting block.
[0012] Furthermore, four sets of rectangular pads are symmetrically fixed to the top of the mold base, and an installation plate is fixed to the top of the lower mold base, with a round pad fixed on the installation plate.
[0013] Furthermore, the horizontal plane at the top of the rectangular pad and the horizontal plane at the top of the circular pad are the same horizontal plane.
[0014] Furthermore, four sets of limiting plates are symmetrically fixed on the outer side of the mold base. Beneficial effects
[0015] 1. By setting up upper and lower trimming blades, during the mold closing process of the upper and lower mold components driven by the external drive structure, the excess part of the sheet metal is trimmed with the cooperation of the upper and lower trimming blades during the forming process, releasing material stress and promoting uniform material flow. Through the idea of "local sacrifice for global benefit", the cut is actively introduced in non-critical areas to redistribute the material flow path and stress field, thereby solving problems such as cracking and wrinkling in deep drawing.
[0016] 2. By setting through slots and waste channels, the cut waste material leaves the equipment through the waste channel after the corner cutting is completed; by setting short fixing plates, long fixing plates, and fixing screw holes, the connection between the lower mold base and the mold base is facilitated by the fixing screw holes on the short fixing plates, lower mold base, and long fixing plates; by setting guide pillars, guide holes, and limiting plates, the upper mold assembly moves stably up and down during the downward movement of the upper mold assembly, with the movable cooperation of the guide pillars and guide holes and the auxiliary limiting of the limiting plates; by setting rectangular pads and circular pads, the downward stroke of the upper mold assembly can be controlled, making it easier to control the mold closing position. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1This is a three-dimensional view of the main structure of a corner-cutting structure for a drawing die according to the present invention;
[0019] Figure 2 This is a perspective view of the mold base structure of a drawing die with a chamfered corner structure according to the present invention;
[0020] Figure 3 This is a three-dimensional view of the upper die assembly structure of a drawing die with a chamfered corner, according to this utility model.
[0021] Figure 4 This is a three-dimensional view of the lower die assembly structure of a drawing die with a chamfered corner, according to this utility model.
[0022] Figure 5 This is a three-dimensional view of the upper and lower trimming blades of a drawing die corner cutting structure according to the present invention.
[0023] The labels in the diagram represent:
[0024] 1. Mold base; 2. Upper mold assembly; 3. Lower mold assembly; 4. Pressure ring; 5. Upper mold base; 6. Die; 7. Lower mold base; 8. Punch; 9. Upper trimming cutter block; 10. Lower trimming cutter block; 11. Through slot; 12. Scrap channel; 13. Large isolation plate; 14. Small isolation plate; 15. Long fixing plate; 16. Mounting slot; 17. Short fixing plate; 18. Fixing screw hole; 19. Guide post; 20. Mounting block; 21. Guide hole; 22. Rectangular pad; 23. Mounting plate; 24. Round pad; 25. Limiting plate. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0026] The present invention will be further described below with reference to the embodiments.
[0027] In some embodiments, please refer to the accompanying drawings. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5A corner-cutting structure for a drawing die includes a die base 1 and a drawing die. The drawing die includes an upper die assembly 2, a lower die assembly 3, and a blank holder 4. The upper die assembly 2 includes an upper die seat 5 and a die 6. The die 6 is fixed at the bottom of the upper die seat 5. The lower die assembly 3 includes a lower die seat 7 and a punch 8. The punch 8 is fixed on the lower die seat 7. The blank holder 4 is disposed above the lower die seat 7. An upper trimming cutter 9 is symmetrically fixed on the bottom edge of the die 6. A lower trimming cutter 10 is fitted and fixed on the blank holder 4. One edge of the upper trimming cutter 9 and one edge of the lower trimming cutter 10 are located on the same vertical plane.
[0028] In this embodiment of the utility model, when in use, the sheet to be formed is placed on the lower mold assembly 3, and the upper mold assembly 2 is driven to move down by the external driving structure. When the die 6 contacts the sheet, the drawing process begins. During the forming process, the upper trimming blade 9 moves down and the lower trimming blade 10 cooperates to cut off the excess part of the sheet, release the material stress, and promote the uniform flow of the material.
[0029] In this embodiment of the utility model, by setting an upper trimming blade 9 and a lower trimming blade 10, during the process of the upper mold assembly 2 and the lower mold assembly 3 being driven by an external driving structure to close the mold, the upper trimming blade 9 and the lower trimming blade 10 cooperate to cut off the excess part of the sheet metal during the forming process, release material stress, and promote uniform material flow. Through the idea of "local sacrifice for global benefit", the cut is actively introduced in non-critical areas to redistribute the material flow path and stress field, thereby solving problems such as cracking and wrinkling in deep drawing.
[0030] In one embodiment of this utility model, through grooves 11 are symmetrically opened on both sides of the center of one side of the lower mold base 7. A waste channel 12 is fixed in the through groove 11. After the corner is cut, the cut waste material leaves the equipment through the waste channel 12. Four sets of large isolation plates 13 are symmetrically installed on the outer walls of the mold base 1 and the upper mold base 5, and four sets of small isolation plates 14 are symmetrically installed on the outer wall of the lower mold base 7. A long fixing plate 15 is fixed on the side wall of the mold base 1, and two sets of mounting grooves 16 are symmetrically opened on the side wall of the lower mold base 7. A short fixing plate 17 is fixed on the inner wall of the mounting groove 16. Fixing screw holes 18 are opened on the short fixing plate 17, the lower mold base 7, and the long fixing plate 15. The fixing screw holes 18 on the short fixing plate 17, the lower mold base 7, and the long fixing plate 15 facilitate the connection between the lower mold base 7 and the mold base 1.
[0031] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a guide post 19 is fixed at the center of the bottom end of the mounting groove 16. The bottom end of the upper mold base 5 is provided with a mounting block 20 that matches the mounting groove 16. A guide hole 21 is provided at the bottom end of the mounting block 20. Four sets of rectangular pads 22 are symmetrically fixed at the top of the mold base 1. The top end of the lower mold base 7 is fixed with a mounting plate 23. A round pad 24 is fixed on the mounting plate 23. The horizontal plane at the top of the rectangular pads 22 and the horizontal plane at the top of the round pad 24 are the same horizontal plane. Four sets of limiting plates 25 are symmetrically fixed on the outer side of the mold base 1.
[0032] In this embodiment of the utility model, when in use, the sheet material to be formed is placed on the lower mold assembly 3, and the upper mold assembly 2 is driven to move downward by the external driving structure. As the upper mold assembly 2 moves downward, the upper mold assembly 2 is assisted to move downward by the cooperation of the guide post 19 and the guide hole 21, and the cooperation of the limiting long plate 25 at the four corner positions. When the die 6 contacts the sheet material, the drawing process begins. During the forming process, the upper trimming blade 9 moves downward and cooperates with the lower trimming blade 10 to cut off the corners of the excess part of the sheet material, release the material stress, and promote the uniform flow of the material. The cut-off waste material leaves the equipment through the waste channel 12. As the upper mold assembly 2 continues to move downward, when the round pad 24 at the top of the upper mold base 5 and the lower mold base 7 and the rectangular pad 22 at the top of the mold base 1 contact, the mold closing is completed, and you can wait for success.
[0033] In this embodiment of the utility model, by setting guide pillars 19, guide holes 21 and limiting plates 25, during the downward movement of the upper mold assembly 2, the guide pillars 19 and guide holes 21 cooperate to ensure the stability of the upper mold assembly 2's vertical movement under the auxiliary limiting of the limiting plates 25; by setting rectangular pads 22 and circular pads 24, the downward stroke of the upper mold assembly 2 can be controlled, which facilitates the control of the mold closing position;
[0034] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A corner-cutting structure for a drawing die, comprising a die base (1) and a drawing die, characterized in that: The drawing die includes an upper die assembly (2), a lower die assembly (3), and a blank holder (4). The upper die assembly (2) includes an upper die base (5) and a die cavity (6). The die cavity (6) is fixed at the bottom of the upper die base (5). The lower die assembly (3) includes a lower die base (7) and a punch (8). The punch (8) is fixed on the lower die base (7). The blank holder (4) is located above the lower die base (7). An upper trimming cutter block (9) is symmetrically fixed on the bottom edge of the die cavity (6). A lower trimming cutter block (10) is fitted and fixed on the blank holder (4). One edge of the upper trimming cutter block (9) and one edge of the lower trimming cutter block (10) are located on the same vertical plane.
2. The corner-cutting structure of the drawing die according to claim 1, characterized in that, The lower mold base (7) has symmetrical through slots (11) on both sides of the center of one side, and a waste channel (12) is fixed in the through slot (11).
3. The corner-cutting structure of the drawing die according to claim 1, characterized in that, Four sets of large isolation discs (13) are symmetrically installed on the outer side walls of the mold base (1) and the upper mold base (5), and four sets of small isolation discs (14) are symmetrically installed on the outer side wall of the lower mold base (7).
4. The corner-cutting structure of the drawing die according to claim 2, characterized in that, A long fixing plate (15) is fixed on the side wall of the mold base (1), and two sets of mounting grooves (16) are symmetrically opened on the side wall of the lower mold base (7). A short fixing plate (17) is fixed on the inner wall of the mounting groove (16), and fixing screw holes (18) are opened on the short fixing plate (17), the lower mold base (7) and the long fixing plate (15).
5. The corner-cutting structure of the drawing die according to claim 4, characterized in that, The bottom center of the mounting groove (16) is fixed with a guide post (19), and the bottom of the upper mold base (5) is provided with a mounting block (20) that cooperates with the mounting groove (16). The bottom of the mounting block (20) is provided with a guide hole (21).
6. The corner-cutting structure of the drawing die according to claim 1, characterized in that, The mold base (1) has four sets of rectangular pads (22) symmetrically fixed at the top, the lower mold base (7) has an installation plate (23) fixed at the top, and a round pad (24) is fixed on the installation plate (23).
7. The corner-cutting structure of the drawing die according to claim 6, characterized in that, The top of the rectangular pad (22) and the top of the circular pad (24) are on the same horizontal plane.
8. The corner-cutting structure of the drawing die according to claim 1, characterized in that, The mold base (1) has four sets of limiting plates (25) symmetrically fixed on its outer side.