CN115106445A

CN115106445A - Cold stamping forming die for gradual change C-angle shell

Info

Publication number: CN115106445A
Application number: CN202211038297.1A
Authority: CN
Inventors: 张燕
Original assignee: Suzhou Chunqiu Electronic Technology Co ltd
Current assignee: Hefei Jingwei Electronic Technology Co ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2022-09-27
Anticipated expiration: 2042-08-29
Also published as: CN115106445B

Abstract

The invention belongs to the technical field of metal stamping processing, and relates to a cold stamping forming die for a gradually-changed C-angle shell, which comprises a male die and a female die, wherein the male die comprises a supporting plate with an upper platform, the female die comprises a pressing plate and a bending plate, the bending plate is provided with a C-angle platform and a bending surface, the supporting plate is provided with a forming edge opposite to the C-angle platform, the front section of the forming edge is of a structure that one more side wall is close to the edge on the basis of a right angle, the rear section of the forming edge is of a structure that one more outer platform is close to the edge and one more convex peak is close to the upper platform on the basis of the C-angle surface, the side wall is connected with the convex peak to form an upper pressing line which gradually moves inwards, and the outer platform forms a side pressing line which gradually arches outwards from the C-angle surface. According to the invention, the upper pressing line and the side pressing line are additionally arranged on the supporting plate, so that the shell of the gradual change C angle is thinned at the inner side of the corner, the outward springback amount of the structure is reduced, the uniform thickness of the upper surface of the shell and the main body of the side wall is ensured, the appearance of the gradual change C angle is prevented from being unsaturated, the cost is saved, and the yield is high.

Description

Cold stamping forming die for gradual change C-angle shell

Technical Field

The invention relates to the technical field of metal stamping processing, in particular to a cold stamping forming die for a gradually-changed C-angle shell.

Background

With the competitive development of the mold industry in China, the mold consumption of the general technical level in China is relatively saturated, and a large market space still exists for the mold product with high technical content, so that the mold industry in China still needs to be greatly improved in the aspect of high precision so as to break through the current technical bottleneck. In recent years, 3C product molds mainly for notebook computers have been taken as a representative, and products are required to be improved in performance and broken through in appearance in order to match existing 5G technologies and the aesthetic sense of people. When an enterprise faces a transformation period, new technology needs to be introduced to continuously break through the difficulty of the mold so as to meet the new technology of a new product, the possibility is unlikely to become possible, and the core competitiveness of the enterprise is improved.

Some notebook computer housings are metal structures, and in some designs there is a gradual C-angle at the sides of the housing. Since the width of the C-angle is gradually increased, the material is processed by a normal C-angle processing method without any change in the spring back of the material, and thus poor warpage is likely to occur. Old structure product master mould face C angle structure need mould shaping back CNC processing again, and the material thickness at product lateral wall C angle can't be guaranteed to CNC direct processing back, and the fracture easily appears in the C angle, needs CNC to attenuate 0.4mm with the whole big face of product, side wall attenuate 0.2 mm. However, the problem of low product yield still exists, and the manufacturing cost is high, so that the production requirement cannot be met.

Therefore, it is necessary to develop a new mold structure to solve the above problems.

Disclosure of Invention

The invention mainly aims to provide a cold punch forming die for a shell with a gradually-changed C angle, which can reduce the resilience of the structure, ensure the uniform thickness of the upper surface and the side wall of the shell, avoid the incomplete appearance of the gradually-changed C angle, save the cost and realize high yield.

The invention realizes the purpose through the following technical scheme: the utility model provides a gradual change C angle casing cold stamping forming mould, includes public mould and master model, public mould is including the layer board that has the upper mounting plate, the master model is including facing the clamp plate of layer board and the board of bending of encircleing the clamp plate, the board of bending has the C angle platform that is used for the outline of shaping gradual change C angle and is located the face of bending outside the C angle platform, the layer board have relative the shaping limit of C angle platform, the anterior cross-section of shaping limit is for the structure of the more side wall that is close to the edge on the right angle basis, the rear portion cross-sectional structure of shaping limit is for the structure of the more outer platform that is close to the edge and the more hump that is close to the upper mounting plate on the basis of C angle surface, the side wall with the hump is connected and is formed the last line that moves inwards gradually, outer platform forms the side line that arches gradually toward outside the shaping limit.

Specifically, the upper pressing line is 15-40% of the thickness of the shell body higher than the upper platform, and the farthest distance between the end face of the side pressing line and the C-angle face is 5-30% of the thickness of the shell body.

Specifically, the male die comprises a stripper plate which surrounds the supporting plate and is arranged in a floating mode, a plurality of limiting blocks used for limiting the initial position of the shell original plate are arranged on the stripper plate, and the edges of the limiting blocks are of R-angle structures.

Specifically, the activity is provided with four and takes off the piece to one side in the public mould, take off the piece to one side and inlay and locate four corners of layer board take off the piece to one side and relative toward when layer board rebound toward the center of layer board removes.

Specifically, a plurality of thimble holes for the thimble to pass through are arranged on the upper platform.

Specifically, the lower part of the bending surface is provided with an R-angle structure.

The technical scheme of the invention has the beneficial effects that:

according to the invention, the upper pressing line and the side pressing line are additionally arranged on the supporting plate, so that the shell of the gradual change C angle is thinned at the inner side of the corner, the resilience quantity of the structure towards the outside is reduced, the uniformity of the thicknesses of the upper surface of the shell and the main body of the side wall is ensured, the appearance of the gradual change C angle is prevented from being not full, the cost is saved (the cost is reduced by about 40%), the yield is high (the yield is improved by about 30%), and the problems of much time and high cost caused by CNC (computer numerical control) processing are avoided.

Drawings

FIG. 1 is a schematic structural view of a cold punch forming die for a gradual change C-angle shell in a die opening state;

FIG. 2 is a schematic structural view of a cold punch forming die for a gradual change C-angle shell in a die closing state;

FIG. 3 is an enlarged view of a portion of FIG. 2 at position A;

FIG. 4 is an enlarged view of a portion of FIG. 3 at position B;

FIG. 5 is a top view of the male mold;

FIG. 6 is a perspective view of the pallet;

fig. 7 is a partially enlarged perspective view of the forming edge.

The figures in the drawings represent:

1-male die, 11-supporting plate, 111-upper platform, 1111-thimble hole, 112-C angle surface, 113-upper pressing line, 1131-side wall, 1132-convex peak, 114-side pressing line, 1141-outer platform, 12-stripper plate, 121-limiting block, 13-inclined stripper block and 14-thimble;

2-a female die, 21-a pressing plate, 22-a bending plate, 221-a C corner table and 222-a bending surface;

3-a shell.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

Example (b):

as shown in fig. 1 to 7, the cold press forming die for a gradual change C-angle shell of the present invention includes a male die 1 and a female die 2, the male die 1 includes a supporting plate 11 having an upper platform 111, the female die 2 includes a pressing plate 21 facing the supporting plate 11 and a bending plate 22 surrounding the pressing plate 21, the bending plate 22 has a C-angle platform 221 for forming an outer contour of the gradual change C-angle on the shell 3 and a bending surface 222 located outside the C-angle platform 221, the supporting plate 11 has a forming edge opposite to the C-angle platform 221, a front cross section of the forming edge is a structure that a side wall 1131 close to the edge is added on a right angle basis, a rear cross section of the forming edge is a structure that an outer platform 1141 close to the edge is added on a C-angle surface 112 and a convex peak 1132 close to the upper platform 111 is added, the side wall 1131 is connected with the convex peak 1132 to form an upper pressing line 113 moving inwards gradually, and the outer platform 1141 forms a side pressing line 114 gradually arching outwards from the forming edge. The raw sheet edge of the housing 3 has typically been pre-bent and its plane may be positioned above the upper platform 111. When the die is closed, the pressing plate 21 presses the main body plane of the original plate on the supporting plate 11, then the bending plate 22 further bends the original plate with the folded angle, the C-angle table 221 enables the edge of the original plate to form an oblique C-angle structure, and the bending surface 222 enables the edge of the original plate to be a vertical surface which is 90 degrees relative to the main body plane. After the punching press is accomplished, what casing 3's outward appearance face presented is normal gradual change C angle structure, but in the inboard at gradual change C angle, utilize line ball 113 and side pressure line 114 to let the inboard material of two corners all by suitable attenuate, so the inboard stress of casing 3 material just can not arouse the structure to kick-back outward, the even of casing 3 upper surface and lateral wall main part thickness has both been guaranteed, avoid gradual change C angle outward appearance not full again, cost saving (cost reduction is about 40%), the yield is high (the yield promotes about 30%), it is many to have removed the time-consuming that CNC processing caused, problem with high costs.

As shown in FIG. 4, the upper pressing line 113 is higher than the upper stage 11115-40% of the thickness of the casing 3, and the end surface of the side pressing line 114 is farthest from the C-angle surface 112 by 5-30% of the thickness of the casing 3. The upper pressing line 113 and the side pressing line 114 can achieve the purpose of proper adjustment deformation in the height interval, and can prevent the corners from being too fragile to cause fracture.

As shown in fig. 3 and 5, the male mold 1 includes a stripper plate 12 surrounding the supporting plate 11 and disposed in a floating manner, four stoppers 121 for limiting an initial position of the shell original plate are disposed on the stripper plate 12, and an edge of each stopper 121 has an R-angle structure. The limiting block 121 defines a rectangular area for accommodating the shell original plate, the limiting block 121 in the embodiment is an L-shaped structure, so that two adjacent sides of the shell original plate can be limited, the R-shaped structure of the limiting block 121 can enable the shell original plate to be automatically in place when the shell original plate is placed on the stripper plate 12, and when the shell is demolded, the stripper plate 12 exerts an upward acting force on the side of the shell 3, so that the shell 3 can be separated from the supporting plate 11.

As shown in fig. 5, four inclined stripping blocks 13 are movably arranged in the male die 1, the inclined stripping blocks 13 are embedded at four corners of the supporting plate 11, and the inclined stripping blocks 13 move upward relative to the supporting plate 11 and retract into the supporting plate 11. Because the shell 3 is wrapped on the upper platform 111 after being molded and the four corners of the shell are easy to crack materials during demolding, the inclined stripping block 13 is adopted to actively contract inwards and jack up during demolding, so that the integrity of the object 3 can be protected.

As shown in fig. 2, 5 and 6, the upper platform 111 is provided with two needle holes 1111 for passing the needles 14 therethrough. The ejector pin 14 can be urged from below the main surface of the housing 3 to push the housing 3 away from the pallet 11. The number of the top pinhole 1111 is limited to two, and can be increased or decreased as required.

As shown in fig. 3, the lower portion of the bending surface 222 has an R-angle structure. The bending surface 222 will contact the edge of the raw material by the R-angle structure when punching, so as to avoid the appearance defect caused by scraping.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a gradual change C angle casing cold stamping forming mould, includes public mould (1) and master model (2), public mould (1) is including layer board (11) that has last platform (111), master model (2) are including facing clamp plate (21) of layer board (11) and the board (22) of bending of surrounding clamp plate (21), the board (22) of bending have be used for shaping the C angle platform (221) of the outline of gradual change C angle on casing (3) and lie in face (222) of bending outside C angle platform (221), the shaping limit of layer board (11) relative C angle platform (221) has, its characterized in that: the front section of the forming edge is of a structure that one more side wall (1131) close to the edge is arranged on the basis of a right angle, the rear section of the forming edge is of a structure that one more outer platform (1141) close to the edge and one more convex peak (1132) close to the upper platform (111) are arranged on the basis of a C-angle surface (112), the side wall (1131) and the convex peak (1132) are connected to form an upper pressing line (113) moving inwards gradually, and the outer platform (1141) forms a side pressing line (114) which is arched gradually towards the outside of the C-angle surface (112).

2. The cold stamping forming die for the gradual change C-angle shell according to claim 1, wherein: the upper pressing line (113) is 15-40% higher than the upper platform (111) in thickness of the shell (3), and the farthest distance between the end face of the side pressing line (114) and the C-angle surface (112) is 5-30% in thickness of the shell (3).

3. The cold stamping forming die for the gradual change C-angle shell according to claim 1, wherein: the male die (1) comprises a stripper plate (12) which surrounds the supporting plate (11) and is arranged in a floating mode, a plurality of limiting blocks (121) used for limiting the initial positions of original plates of the shell (3) are arranged on the stripper plate (12), and the edges of the limiting blocks (121) are of R-angle structures.

4. The cold stamping forming die for the gradual change C-angle shell according to claim 1, wherein: the male die is characterized in that four inclined stripping blocks (13) are movably arranged in the male die (1), the inclined stripping blocks (13) are embedded at four corners of the supporting plate (11), and the inclined stripping blocks (13) move towards the center of the supporting plate (11) while moving upwards relative to the supporting plate (11).

5. The cold stamping forming die for the gradual change C-angle shell according to claim 1, wherein: the upper platform (111) is provided with a plurality of thimble holes (1111) for thimbles (14) to pass through.

6. The cold stamping forming die for the gradual change C-angle shell according to claim 1, wherein: the lower part of the bending surface (222) is provided with an R-angle structure.