Die structure for hole flanging forming

Abstract

The utility model provides a die structure for hole flanging forming. The die structure adopts a drawing and wrapping stamping die, a heading and wrapping stamping die, a punching stamping die, a hole flanging stamping die and a chamfering stamping die, the bag pulling stamping die is provided with a bag pulling punch and a bag pulling female die, the bag upsetting stamping die is provided with a material extruding and bag upsetting punch and a bag upsetting female die, the punching stamping die is provided with a punching needle, a hole flanging stamping die and a hole flanging punch, the chamfering stamping die is provided with a chamfering punch, and the bag pulling stamping die and the bag upsetting stamping die complete bag pulling and material extruding and bag upsetting to prevent punching and flanging from generating marks. Forming and cracking of punched hole flanging are avoided, the rejection rate of parts is reduced, the service life of the die is prolonged, the punching needle precision is improved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of die design and manufacturing, in particular to a die structure for flanging forming. Background Art

[0002] With the rapid development of dies, especially the significant improvement in the vehicle model update iteration speed, the replacement of automotive stamping parts products has become more frequent. Especially during the flanging stamping of parts, the problem of die punching and flanging scratches and deformation is a common problem in the production process and is widespread in major automotive parts factories. For the flanging forming die, the essence of punching and flanging scratches and deformation is due to the misalignment of the die punch, different product materials, or too high flanging height required by customers. To improve the problem of punching and flanging scratches and deformation, flanging stamping reduces the production process stability and production efficiency, increases the part rejection rate. On the other hand, it will cause more serious wear of the die, reduce the die life and the accuracy of the punch workpiece, and increase the die repair times and production downtime. Content of the Utility Model

[0003] The utility model provides a die structure for flanging forming, which adopts a drawing and bulging die, a squeezing and bulging die, a punching die, a flanging die, and a chamfering die. The drawing and bulging die and the squeezing and bulging die complete drawing and squeezing and bulging, prevent the occurrence of marks during punching and flanging, realize non-scratch and non-deformation during stamping flanging, reduce the part rejection rate, improve the die life and the accuracy of the punching punch, and improve work efficiency.

[0004] To solve the above problems, the utility model provides a die structure for flanging forming, including a drawing and bulging die, a squeezing and bulging die, a punching die, a flanging die, and a chamfering die; the drawing and bulging die is provided with a drawing punch and a drawing die, the squeezing and bulging die is provided with a squeezing and bulging punch and a bulging die, the punching die is provided with a punch, the flanging die is provided with a flanging punch, and the chamfering die is provided with a chamfering punch, realizing non-cracking during stamping flanging.

[0005] Preferably, the drawing die and the bulging die are provided with limiting ejector rods on the plane with internal ejecting force, corresponding to the convex heads of the drawing punch and the squeezing and bulging punch of the upper die respectively.

[0006] Internal ejection must be designed inside the die, and the force should be as large as possible so that it is not easy to crack.

[0007] Preferably, the drawing punch is a punch for pressure drawing and bulging, and the surface finish of the die is above R1.6.

[0008] A higher surface finish of the convex and concave dies is more convenient for drawing and bulging.

[0009] Preferably, the upper and lower dies of the squeezing and bulging punch are fixed bulges without pressure feeding.

[0010] Preferably, the diameter of the material extrusion and bulging punch is 3-5 mm larger than the diameter of the wrapping punch.

[0011] The diameter of the material extrusion and bulging punch must be 3-5 mm larger than one side of the wrapping punch to prevent marks and deformation due to stretching.

[0012] Preferably, the diameter of the punching pin of the punching die is smaller than the diameter of this process by 0.1-0.2 mm on one side.

[0013] Preferably, the aperture diameter of the turning pin of the hole flanging die is designed according to the aperture requirements of the part tapping, and its surface is treated with wear resistance and high hardness.

[0014] Preferably, the chamfering pin is provided with a tube position hole flanging inner diameter, and the chamfering of the chamfering die is to prevent reverse burrs from being generated during tapping.

[0015] Preferably, for the chamfering and reverse bulging hole flanging end face, the reverse bulging amount is below 0.3 mm, otherwise the aperture is likely to be defective.

[0016] The beneficial effects of the present utility model are as follows: By using a wrapping die, a bulging die, a punching die, a hole flanging die and a chamfering die, the wrapping die and the bulging die complete wrapping and material extrusion and bulging, prevent marks from being generated during punching and flanging, achieve non-stretching and non-deforming of stamping hole flanging, reduce the scrap rate of parts, improve the die life of hole flanging forming and the accuracy of punching pins, improve work efficiency, and meet the accuracy quality of punching and hole flanging of stamping parts and the service life of the hole flanging die. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic cross-sectional structure view of an embodiment of the present utility model;

[0018] Figure 2 is a schematic exploded structure view of an embodiment of the present utility model.

[0019] REFERENCE MARKS

[0020] 1. Wrapping punch; 2. Material extrusion and bulging punch; 3. First limit top block; 4. Female die; 5. Stripping spring; 6. Second limit top block; 7. Bulging female die; 8. Punching pin; 9. Punching female die; 10. Hole flanging punch; 11. Hole flanging female die; 12. Chamfering punch; 13. Chamfering female die; 14. Packing punch clamping plate insert; 15. First stripping plate; 16. Stripping plate insert; 17. Second stripping plate; 18. Third stripping plate; 19. Lower die female die quick-change insert. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to more fully understand the technical content of the present utility model, the technical solution of the present utility model will be further introduced and described below in conjunction with the drawings and specific embodiments, but it is not limited thereto.

[0022] AsFigure 1 and Figure 2 As shown in Figure 2 , a specific embodiment of the present utility model is a die structure for hole flanging forming, including a draw bead die, a bulging die, a punching die, a hole flanging die and a chamfering die; the draw bead die is provided with a draw bead punch 1 and a draw bead die 4, the bulging die is provided with a material squeezing bulging punch 2 and a bulging die 7, the punching die is provided with a punch pin 8 and a punching die 9, the hole flanging die is provided with a hole flanging punch 10 and a hole flanging die 11, and the chamfering die is provided with a chamfering punch 12 and a chamfering die 13, realizing that the stamping hole flanging does not crack during forming.

[0023] Furthermore, the draw bead die 4 and the bulging die 7 are provided with a limit ejector rod 1 for the plane with internal ejecting force and a limit ejector rod 6, corresponding to the convex heads of the draw bead punch 1 and the material squeezing bulging punch 2 of the upper die respectively.

[0024] A limit ejector rod 1 for the plane with internal ejecting force and a limit ejector rod 6 must be designed inside the die, so that it is not easy to crack.

[0025] Furthermore, the draw bead punch 1 is a punch for pressing and drawing beads, and the surface finish of the die is above R1.6.

[0026] The high surface finish of the concave and convex dies is more convenient for drawing beads.

[0027] Furthermore, the upper and lower dies of the material squeezing bulging punch 2 are dead bulges without material pressing.

[0028] Furthermore, the diameter of the material squeezing bulging punch 2 is 3 - 5 mm larger than the diameter of the draw bead punch 1.

[0029] The diameter of the material squeezing bulging punch 2 must be 3 - 5 mm larger than the unilateral diameter of the draw bead punch 1 to prevent the generation of marks and avoid drawing and deformation.

[0030] Furthermore, the diameter of the punch pin 8 of the punching die is smaller than the diameter of this process, with a unilateral reduction of 0.1 - 0.2 mm.

[0031] Furthermore, the aperture of the hole flanging needle of the hole flanging die should be designed according to the aperture requirements of the part tapping, and its surface is treated with wear resistance and high hardness.

[0032] Furthermore, the chamfering needle is provided with a tube position for the inner diameter of the hole flanging, and the chamfering of the chamfering die is to prevent the generation of reverse burrs during tapping.

[0033] Furthermore, the reverse bulging of the chamfered hole flanging end face, and the reverse bulging amount is below 0.3 mm, otherwise it is easy to cause poor aperture.

[0034] The present utility model has the following characteristics:

[0035] (1) For the production data of the diameter of the hole flanging punch 10;

[0036] (2) Select an appropriate size for the punching pin 8 according to different material thicknesses to avoid generation;

[0037] (3) Flanging processing of ultra-thick / ultra-thin sheet materials;

[0038] (4) Flanging processing for preventing burrs, cracking and deformation during production.

[0039] The essence of the scratch and deformation in punching and flanging is due to the misalignment of the punching pin 8 of the mold, the difference in product materials, or the excessive flanging height required by the customer. Generally, the following methods can be used to improve the problem of scratch and deformation in punching and flanging.

[0040] The mold structure for flanging forming of the present utility model further includes a packing punch clamping plate insert 14, a stripper plate 15, a stripper plate insert 16, a stripper plate 17, a stripper plate 18, a stripper spring 5, and a lower die cavity quick-change insert 19.

[0041] For thicker materials, there are five technological steps as follows:

[0042] The first step is stretch wrapping; an internal top must be designed inside the cavity, and the force should be as large as possible to prevent cracking. Pay attention to exhaust, and the surface finish of the concave and convex dies should be noted. In this step, pressure should be applied for stretch wrapping.

[0043] The second step is material squeezing and bulging: it is a dead punch between the upper and lower dies without pressure application. The bulge here is upward, and the punch must be 3 - 5 mm larger than the first bulge on each side to prevent marks.

[0044] The convex die should pay attention to protecting the R to avoid unnecessary marks on the front of the flanging.

[0045] Material squeezing and bulging: In this step, it is a dead punch between the upper and lower dies without pressure application. The bulge here is upward, and the punch must be 3 - 5 mm larger than the first bulge on each side to prevent marks. The height of the convex die is adjustable, mainly to squeeze the material at the top of the bulge to the periphery.

[0046] The third step is punching: The diameter of the punching pin 5.1 should be smaller than the process diameter 5.4, generally 0.1 - 0.2 mm smaller on each side. The waste hole in the lower die can be larger, but it should support the periphery of the bulge, not the larger the better.

[0047] The stripper plate 17 applies pressure only to the periphery of the bulge.

[0048] The fourth step is flanging and straightening: The flanging pin needs surface treatment as it is prone to wear during mass production due to friction. The diameter of the flanging pin should be designed according to the customer's hole diameter requirements. A smaller hole diameter has a greater thread torque but is also prone to broken taps. It is necessary to discuss with the customer to achieve a balance. Pay attention to the stripping force.

[0049] The fifth step is chamfering: The chamfering here is to prevent reverse burrs during tapping. The chamfering pin should be positioned to the inner diameter of the flanging. Sometimes there is also reverse bulging on the flanging end face, but it should be noted that the reverse bulging amount should be controlled below 0.3, otherwise the hole diameter will be defective.

[0050] The beneficial effects of the present utility model are as follows: By using a drawing and bulging die, a bulging die, a punching die, a hole flanging die and a chamfering die, the drawing and bulging die and the bulging die complete drawing and material squeezing and bulging, prevent marks from being generated during punching and flanging, achieve non-scratching and deformation during stamping and hole flanging, reduce the scrap rate of parts, improve the die life and the precision of the punching punch 8, improve work efficiency, and meet the precision quality of punching and hole flanging of stamping parts and the service life of the hole flanging die.

[0051] The above is only the preferred embodiment of this patent, and does not limit the scope of this patent. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings, directly or indirectly applied in other related technical fields, shall fall within the protection scope of this patent.

Claims

1. A die structure for hole flanging forming, characterized in that, It includes a draw forming die, a bulging die, a punching die, a hole flanging die and a chamfering die; the draw forming die is provided with a draw forming punch and a draw forming die cavity, the bulging die is provided with a material extruding and bulging punch and a bulging die cavity, the punching die is provided with a punch pin, the hole flanging die is provided with a hole flanging punch, and the chamfering die is provided with a chamfering punch, so as to achieve that the hole flanging during stamping does not crack during forming; The draw forming die cavity and the bulging die cavity are provided with limit ejector rods on the planes with internal ejecting force, corresponding to the convex heads of the draw forming punch and the material extruding and bulging punch of the upper die respectively; The upper and lower dies of the material extruding and bulging punch are fixed bulges without blank holding; The chamfering punch is provided with a tube position for the inner diameter of the hole flanging, and the chamfer of the chamfering die is to prevent reverse burrs from being generated during tapping; The diameter of the material extruding and bulging punch is 3-5 mm larger than the diameter of the draw forming punch; For the reverse bulging end face of the chamfering punch, the reverse bulging amount is below 0.3 mm, otherwise it is easy to cause poor hole diameter; 2. The die structure for hole flanging forming according to claim 1, characterized in that, The draw forming punch is a punch for blank holding and draw forming, and the surface finish of the die cavity is above R1.6; 3. The die structure for hole flanging forming according to claim 1, characterized in that, The diameter of the punch pin of the punching die should be smaller than the diameter of the process, with a unilateral reduction of 0.1-0.2 mm; 4. The die structure for hole flanging forming according to claim 1, characterized in that, The hole diameter of the hole flanging needle of the hole flanging die should be designed according to the hole diameter requirements for tapping of the part, and its surface is subjected to wear resistance and high hardness treatment.

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