CN111889570A

CN111889570A - Locking rib in stamping die and application thereof

Info

Publication number: CN111889570A
Application number: CN202010729817.8A
Authority: CN
Inventors: 王中; 邵帅; 石凤标
Original assignee: Gz Tooling Group Automobile Technology Co ltd
Current assignee: Gz Tooling Group Automobile Technology Co ltd
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2020-11-06

Abstract

The invention discloses a locking rib in a stamping die and application thereof, belongs to the field of stamping dies, and particularly relates to a locking rib and application thereof; the stamping die comprises an upper stamping die and a lower stamping die, wherein locking ribs are arranged at the edges of the upper stamping die and the lower stamping die, and the locking ribs are of closed structures connected end to end; the locking rib comprises a convex block arranged on the inner side of the stamping upper die and a groove arranged on the inner side of the stamping lower die, the convex block is embedded in the groove, and materials in the stamping upper die and the stamping lower die are locked in the inner cavity. The invention provides a drawing bead form for a stamping die, wherein the proper drawing bead can increase the thinning amount of a plate, increase the feeding resistance, optimize the forming state and prevent the plate from wrinkling.

Description

Locking rib in stamping die and application thereof

Technical Field

The invention belongs to the field of stamping dies, and particularly relates to a locking rib and application thereof.

Background

The stamping technology of automobile bodies is an important component of automobile manufacturing technology. Under the concept that society attaches importance to environmental protection, economic promotion and open source throttling at present, the maximum utilization of materials becomes a new mark post for manufacturing industry

In the manufacture of dies for press production, a drawing die is one of the most important forming processes. Draw beads play a critical role in draw dies. A draw bead is a feature provided on a die to increase the flow resistance of a sheet material during stretching. The shape of the drawing rib is provided with a square drawing rib and a semicircular section drawing rib, and the resistance is a little larger than that of the drawing rib.

In most plate drawing, a draw bead is an essential die component, and research aiming at locking the draw bead becomes an important subject in the field of plate stamping forming at present.

Disclosure of Invention

The invention aims to provide a locking rib in a stamping die and application thereof, and aims to solve the technical problem of insufficient stretching caused by unbalanced flow speed of materials at all parts along a female die opening during the forming of a plate blank in the deep drawing production.

In order to achieve the purpose, the invention provides a locking rib in a stamping die and a specific technical scheme of application thereof, wherein the locking rib comprises the following steps:

the drawing rib is as follows: in the drawing production, especially in the drawing process of large workpieces such as automobile body panels and the like, the flowing speed of materials at each part along a female die opening is not uniform when a plate blank is formed due to the asymmetry of the geometric profile of the parts, so that the drawn workpiece is locally thinned to cause necking or cracking, and quality defects such as wrinkling and corrugation occur at some parts. In order to improve the situation, the feeding resistance provided for different parts of the workpiece needs to be controlled on the pressing surface, namely the feeding resistance is small at the part requiring more materials, and the feeding resistance is large at the part requiring less materials, so that the flow speed difference of the blank at the opening part of the die is balanced, and the part forming quality is improved.

The method for setting the draw bead is a method which is flexible and convenient to apply and easy to modify, and mainly comprises the following steps:

1. controlling the feeding resistance of the material in the deformation area, and adjusting the tension and the distribution of the tension in the stamping deformation area;

2. through proper configuration of various parameters of the draw bead, the flowing condition of the material can be adjusted by balancing the feeding resistance of each part of the workpiece, the flowing stability of the blank is improved, and the stamping part with uniform deformation is obtained;

3. after the draw bead is used, the gap between the pressing surfaces can be properly enlarged, and the surface precision can be properly reduced, so that the abrasion of the pressing surfaces is reduced, and the manufacturing cost of the die is reduced.

4. By increasing the radial tensile stress, the plastic deformation degree and the hardening degree of the material are improved, the defects of relaxation rebound, corrugation and the like caused by insufficient deformation are reduced, and the rigidity of the workpiece is improved.

5. The method can prevent the inevitable wrinkles from entering the trimming line due to the uneven flow of the material around the flange, and reduce or eliminate the inner wrinkles of the suspended part of the complex part caused by material concentration.

6. The feeding resistance provided by the draw bead can reduce the requirement on the tonnage of the press bed to a certain extent; by increasing the bulging component and the feeding resistance, the overall dimension of the plate can be reduced, and the material utilization rate is improved.

At present, in most plate drawing, a draw bead is an indispensable mould component, and the research aiming at locking the draw bead becomes an important subject in the field of plate stamping forming at present.

The locking rib in the stamping die comprises an upper stamping die and a lower stamping die, wherein the edges of the upper stamping die and the lower stamping die are provided with the locking rib, and the locking rib is a closed structure connected end to end;

the locking rib comprises a convex block arranged on the inner side of the stamping upper die and a groove arranged on the inner side of the stamping lower die, the convex block is embedded in the groove, and materials in the stamping upper die and the stamping lower die are locked in the inner cavity.

Further, the groove comprises a first side face, a second side face and a third side face, and first round corners are arranged at two ends of the third side face, the first side face and the second side face.

Furthermore, a guide surface is arranged on one side, far away from the second side surface, of the first side surface, one end, close to the first side surface, of the guide surface is horizontally arranged, and the end, far away from the first side surface, of the guide surface is tilted upwards;

the length of one end of the guide surface which is horizontally arranged is X1, and the value range of X1 is more than or equal to 10.

Furthermore, one end of the second side surface, which is far away from the first side surface, is provided with a horizontal top surface.

Further, the shape of the lug is completely consistent with that of the groove.

Furthermore, one surface, far away from the groove, of the stamping lower die is provided with a first pressure bearing surface, a second pressure bearing surface and a third pressure bearing surface, the first pressure bearing surface, the second pressure bearing surface and the third pressure bearing surface are all horizontally arranged, and two ends of the second pressure bearing surface are respectively connected with the first pressure bearing surface and the third pressure bearing surface through second fillets;

the radius of the second round angle is r, and the value range of r is 1.5-2 mm.

Further, the distance between the second pressure bearing face and the second side face is e, the value of e is 2+ T, and T is the thickness of the plate.

Further, the minimum distance between the first side face and the second fillet is c, the value of c is 0.15+ T, and T is the thickness of the plate.

Further, the distance between the first side surface and the third side surface is W, and the value range of W is 10-12 mm; the radius of the first round angle is R, and the value range of R is 1.5-2 mm; the height of the first side surface and the third side surface is h, and the value range of h is 5-6mm

The invention also provides application of the locking rib in the stamping die as steel plate forming or aluminum plate forming.

The locking rib in the stamping die and the application thereof have the following advantages that: the proper draw bead can increase the thinning amount of the plate, increase the feeding resistance, optimize the forming state and prevent the plate from wrinkling.

Drawings

Fig. 1 is a schematic cross-sectional view of a locking rib in a press die according to the present invention.

Fig. 2 is a schematic view of a structure of the locking rib of the stamping die of the present invention, wherein the protrusion and the groove are matched.

Fig. 3 is a schematic diagram of the working state of the projection and the groove of the locking rib in the stamping die according to the invention.

Fig. 4 is a top view of a lower punch die of a locking rib in a punch die according to the present invention.

Fig. 5 is a partial enlarged view of fig. 4 at a.

Fig. 6 is a schematic structural view of the reduction ratio without using the locking rib.

Fig. 7 is a schematic structural view of the reduction ratio of the locking rib in the stamping die using the invention.

Fig. 8 is a schematic diagram of the structure of the feeding state without using the locking rib.

Fig. 9 is a structural schematic diagram of a feeding state of a locking rib in a press die using the present invention.

Fig. 10 is a schematic view of a molding state without using a locking rib.

Fig. 11 is a schematic structural view showing a molding state of a locking rib in a press mold using the present invention.

Fig. 12 is a schematic view of a wrinkled state without using a locking rib.

Fig. 13 is a structural schematic view of a crimped state of a locking rib in a press die using the present invention.

Fig. 14 is a schematic view of the slab state without the use of the locking ribs.

Fig. 15 is a schematic structural view of a plate material state using a locking rib in a press mold according to the present invention.

The notation in the figure is: 1. punching an upper die; 2. punching a lower die; 3. locking the rib; 31. a bump; 32. a groove; 321. a first side surface; 322. a second side surface; 323. a third side; 324. a first rounded corner; 325. a guide surface; 326. a horizontal top surface; 4. a first pressure bearing face; 5. a second pressure bearing face; 6. A third bearing surface; 7. a second rounded corner.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, the following describes a locking rib in a stamping die and its application in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 15, the locking rib in the stamping die of the present invention includes a stamping upper die 1 and a stamping lower die 2, wherein locking ribs 3 are disposed at edges of the stamping upper die 1 and the stamping lower die 2, and the locking ribs 3 are of a closed structure connected end to end;

the locking rib 3 comprises a convex block 31 arranged on the inner side of the stamping upper die 1 and a groove 32 arranged on the inner side of the stamping lower die 2, the convex block 31 is embedded in the groove 32, and materials in the stamping upper die 1 and the stamping lower die 2 are locked in an inner cavity.

In the present embodiment, the groove 32 includes a first side 321, a second side 322 and a third side 323, and both ends of the third side 323 and the first side 321 and the second side 322 are provided with a first fillet 324.

In this embodiment, a guide surface 325 is disposed on a side of the first side surface 321 away from the second side surface 322, one end of the guide surface 325 close to the first side surface 321 is horizontally disposed, and one end of the guide surface 325 away from the first side surface 321 is tilted upward;

the length of one end of the guide surface 325 which is horizontally arranged is X1, and the value range of X1 is more than or equal to 10.

In this embodiment, a horizontal top surface 326 is disposed at an end of the second side surface 322 away from the first side surface 321.

In the present embodiment, the shape of the protrusion 31 and the shape of the groove 32 are completely the same.

In this embodiment, a first pressure-bearing face 4, a second pressure-bearing face 5 and a third pressure-bearing face 6 are provided on a face of the punching lower die 2 away from the groove 32, the first pressure-bearing face 4, the second pressure-bearing face 5 and the third pressure-bearing face 6 are all horizontally arranged, and two ends of the second pressure-bearing face 5 are respectively connected with the first pressure-bearing face 4 and the third pressure-bearing face 6 through a second fillet 7;

the radius of the second round angle 7 is r, and the value range of r is 1.5-2 mm.

In this embodiment, the distance between the second pressure-bearing face 5 and the second side face 322 is e, the value of e is 2+ T, and T is the thickness of the plate.

In this embodiment, the minimum distance between the first side surface 321 and the second side surface 322 and the second fillet 7 is c, the value of c is 0.15+ T, and T is the thickness of the plate.

In this embodiment, the distance between the first side 321 and the third side 323 is W, and the range of W is 10-12 mm; the radius of the first round corner 324 is R, and the value range of R is 1.5-2 mm; the height of the first side surface 321 and the third side surface 323 is h, and the value range of h is 5-6 mm.

The invention also provides application of the locking rib in the stamping die as steel plate material forming or aluminum plate material forming, wherein specific parameters of the steel plate locking rib 3 are specifically listed in table 1, and specific parameters of the aluminum plate locking rib 3 are specifically listed in table 2.

TABLE 1

TABLE 2

The locking rib 3 provided by the invention has the following advantages:

1. increasing the thinning amount of the plate, and comparing the thinning rate values, the size and the quality of the part with the increased thinning amount are more stable, as shown in the attached figures 6-7 of the specification, the thinning rate of the non-locking rib in the figure 6 is 2.7% -4.7%, and the thinning rate of the locking rib in the figure 7 is 6.2% -7.1%.

2. The feeding resistance is increased, and the size and the quality of the part are more stable after the feeding resistance is increased by comparing the inflow value, as shown in the specification of figures 8-9, the inflow of the non-locking rib in figure 8 is 19-21 mm, and the inflow of the locking rib in figure 9 is about 0.07 mm.

3. And optimizing the forming state, wherein the size and the quality of the part after the forming state is optimized are more stable by comparing with the forming state, as shown in the attached drawings 10-11 of the specification, the forming state of the non-locking rib in the figure 10 uses the position encircled by the rectangular broken line frame to show that the part is not fully stretched, and the forming state of the locking rib in the figure 11 is fully stretched.

4. The sheet material is prevented from wrinkling, and by comparing the wrinkling state, as shown in the attached drawings 12-13 of the specification, the wrinkling state of the non-locking rib in the figure 12 uses a rectangular dotted line frame to circle a position to have wrinkling phenomenon, and the wrinkling state of the locking rib in the figure 13 is completely passed through.

5. The product quality and the utilization rate are improved, and the size of the plate used for locking the ribs is smaller and saves more materials by comparing with the size of the plate, as shown in the attached figures 14-15 of the specification, the size of the plate used for the non-locking ribs in figure 14 is 910mm by 1452.58mm, and the size of the plate used for the locking ribs in figure 15 is 860 by 1452.58.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The locking rib in the stamping die is characterized by comprising an upper stamping die (1) and a lower stamping die (2), wherein locking ribs (3) are arranged at the edges of the upper stamping die (1) and the lower stamping die (2), and the locking ribs (3) are of a closed structure connected end to end;

the locking rib (3) comprises a convex block (31) arranged on the inner side of the stamping upper die (1) and a groove (32) arranged on the inner side of the stamping lower die (2), the convex block (31) is embedded in the groove (32), and materials in the stamping upper die (1) and the stamping lower die (2) are locked in an inner cavity.

2. The locking rib in the stamping die according to claim 1, wherein the groove (32) comprises a first side surface (321), a second side surface (322) and a third side surface (323), and both ends of the third side surface (323) and the first side surface (321) and the second side surface (322) are provided with a first round angle (324).

3. The locking rib in the punching die according to claim 2, wherein a guide surface (325) is arranged on one side of the first side surface (321) far away from the second side surface (322), one end of the guide surface (325) close to the first side surface (321) is horizontally arranged, and one end far away from the first side surface (321) is tilted upwards;

the length of one end of the guide surface (325) which is horizontally arranged is X1, and the value range of X1 is more than or equal to 10.

4. The lock bar in a press tool according to claim 3, wherein the second side surface (322) is provided with a horizontal top surface (326) at an end thereof remote from the first side surface (321).

5. The locking rib in a press die according to any one of claims 1 to 4, wherein the projection (31) is completely conformed to the shape of the groove (32).

6. The locking rib in the stamping die according to claim 2, wherein a first pressure bearing face (4), a second pressure bearing face (5) and a third pressure bearing face (6) are arranged on one side of the stamping lower die (2) far away from the groove (32), the first pressure bearing face (4), the second pressure bearing face (5) and the third pressure bearing face (6) are horizontally arranged, and two ends of the second pressure bearing face (5) are respectively connected with the first pressure bearing face (4) and the third pressure bearing face (6) through a second fillet (7);

the radius of the second round angle (7) is r, and the value range of r is 1.5-2 mm.

7. The locking rib in the stamping die as recited in claim 6, wherein the distance between the second pressure-bearing face (5) and the second side face (322) is e, the value of e is 2+ T, and T is the thickness of the plate.

8. The locking rib in the stamping die according to claim 6, wherein the minimum distance between the first side surface (321) and the second side surface (322) and the second fillet (7) is c, the value of c is 0.15+ T, and T is the thickness of the plate.

9. The locking rib in the stamping die according to claim 2, wherein the distance between the first side surface (321) and the third side surface (323) is W, and the value of W ranges from 10mm to 12 mm; the radius of the first round corner (324) is R, and the value range of R is 1.5-2 mm; the height of the first side face (321) and the third side face (323) is h, and the value range of h is 5-6 mm.

10. Use of the locking bar in a stamping die according to any of claims 1 to 9 for sheet forming of steel or sheet forming of aluminium.