CN115430773B

CN115430773B - Continuous stamping method for high-low side square-strip folding structural part

Info

Publication number: CN115430773B
Application number: CN202211384149.5A
Authority: CN
Inventors: 顾大明
Original assignee: Suzhou Mingfeng Precision Machinery Co ltd
Current assignee: Suzhou Mingfeng Precision Machinery Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-03-24
Anticipated expiration: 2042-11-07
Also published as: CN115430773A

Abstract

The invention belongs to the technical field of stamping processing, and relates to a continuous stamping method for a high-low side square-strip folding structural part, which comprises the following steps: punching, precutting, embossing, trimming, bending and blanking; in the step of embossing, embossing and deforming the middle part of the precut outline to form a convex hull; the trimming step cuts out a main contour on the processing area to form a pre-forming part; bending the preformed part along two folding edges perpendicular to the conveying direction of the material belt to form a high-low surface and two folding surfaces forming a preset included angle with the high-low surface, wherein the two folding edges are overlapped with two transition edges of the convex hull; the pre-cutting step leaves a process bulge at a position close to the folded edge, the range of the convex hull comprises the process bulge, the bending step clamps the process bulge to weaken the deformation of the convex hull for positioning, and the shaping step cuts off the process bulge to leave a narrow folded edge. The method utilizes the process bulge in the convex hull to help the narrow flanging structure to be formed, and has simple process and high structure precision.

Description

Continuous stamping method for high-low side square-strip folding structural part

Technical Field

The invention relates to the technical field of stamping, in particular to a continuous stamping method for a high-low side square-strip folding structural part.

Background

Metal stamping is a common method of processing metal articles. With the diversification of customer requirements, the design of the mold is also adapted to various product requirements. Almost all workpieces with a little complicated structure are manufactured by continuous stamping. Generally, metal stamping is to use a metal material belt with a certain width as a processing raw material, and then obtain a final product structure by cutting, raising, bending, riveting and other methods.

Fig. 1 shows a panel bracket, which is a structural member produced in pairs, and the structural member is divided into a left structural member 1a and a right structural member 1b, the structures of the two structural members are mirror images, the structure of the panel bracket is provided with a high-low surface 11 and a first folding surface 12a and a second folding surface 12b which are positioned at two sides of the high-low surface 11, the first folding surface 12a is provided with a plurality of holes and flanging structures, a part of the high-low surface 11 is a narrow flanging 111 structure adjacent to the second folding surface 12b, and holes of other forms are arranged in the range of the high-low surface 11 and the second folding surface 12 b. This creates conflicting processing difficulties:

1. the high-low surface 11 can improve the rigidity of the structure in the structural member, and if the high-low surface is made later than the first folding surface 12a and the second folding surface 12b, uneven material thickness and hole position deviation can be caused;

2. the narrow flange 111 is a part of the high-low surface 11, and if the high-low surface 11 is formed first and then bent, the narrow flange 111 is too narrow, and thus distortion is likely to occur.

Therefore, it is necessary to design a new stamping method to solve the above problems.

Disclosure of Invention

The invention mainly aims to provide a continuous stamping method of a high-low side square belt flanging structural member, which can obtain a high-low side square belt flanging structure, enables a narrow flanging to be formed better and has high structural precision.

The invention realizes the purpose through the following technical scheme: a continuous stamping method for a high-low side square strip folding structural part comprises the following steps:

s1, punching: the range of the processing unit comprises a positioning connection area and a processing area in design, the head end and two sides of the material belt are used as positioning, and positioning holes are punched in the range of the positioning connection area;

s2, precutting: cutting a precut outline at the edge and the middle part of the processing area by taking the positioning hole as a reference;

s3, embossing: with the positioning hole as a reference, carrying out convex deformation on the middle part of the precut outline to form a convex hull;

s4, trimming: cutting a main outline on the processing area by taking the positioning hole as a reference to form a preforming part partially connected to the positioning connection area;

s5, bending: bending the preformed part along two folded edges perpendicular to the conveying direction of the material belt by taking the positioning hole as a reference to form a high-low surface and two folded surfaces forming a preset included angle with the high-low surface, wherein the two folded edges are overlapped with two transition edges of the convex hull;

s6, shaping: with the positioning hole as a reference, carrying out operations of re-bending, side punching or hole flanging on the folded surface to deform the material of the preformed part into a structural member;

s7, blanking: taking the positioning hole as a reference, and cutting the structural part from the positioning connection area;

the pre-cutting step leaves a process bulge at a position close to the folded edge, the range of the convex hull comprises the process bulge, the bending step clamps the process bulge to weaken the deformation of the convex hull, and the shaping step cuts off the process bulge to leave a narrow folded edge.

Specifically, the range of the processing unit comprises a middle positioning connection area and two processing areas positioned at two sides of the positioning connection area in design, and the bending step bends the preformed part along two folding edges perpendicular to the conveying direction of the material belt.

Further, the punching step includes an operation of cutting out a side protrusion in the positioning connection area, and the pre-cutting step folds the side protrusion to a vertical direction as a reference of a tape conveying direction.

Further, the punching step includes cutting an auxiliary positioning hole in the machining area, the auxiliary positioning hole being located within the range cut by the trimming step and near the convex hull.

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

the method adopts a mode of firstly raising and then bending to obtain the structural member with the folded edges on the high and low surface sides, and the process bulge is utilized to help the narrow folded edge structure to be formed, so that the process is simple, and the structural precision is high.

Drawings

FIG. 1 is a schematic structural view of a structural member;

FIG. 2 is a diagram showing the variation of the tape;

FIG. 3 is an enlarged view of a portion of the location A of FIG. 2;

fig. 4 is a partially enlarged view of the position B in fig. 2.

Labeled in the figure as:

1 a-left structural part, 1 b-right structural part, 11-high and low surfaces, 12 a-first folding surface, 12 b-second folding surface and 111-narrow flanging;

2-positioning connection area, 21-positioning hole, 22-side bulge;

3-machining zone, 31-convex hull, 311-technological bulge, 32-preforming part, 33-flanging, 34-auxiliary positioning hole.

Detailed Description

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

Example (b):

as shown in fig. 2 to 4, the continuous punching method of the high and low side square flanged structural member of the present invention includes the steps of:

s1, punching: the range of the processing unit comprises a middle positioning connection area 2 and two processing areas 3 positioned at two sides of the positioning connection area 2 in the design, the head end and two sides of the material belt are used as positioning, and positioning holes 21 are punched in the range of the positioning connection area 2. In this embodiment, two symmetrical left and right structural members 1a and 1b are formed at a time, so that a two-sided typesetting manner is adopted. The mode of typesetting on two sides is also suitable for the scheme that the structural parts are the same and the directions of the forming structures on two sides are turned by 180 degrees. Even if the structural members on both sides are not symmetrical, the structural members can be manufactured by adopting the method as long as the bending directions are the same. In practice, the connecting area may be located outside and the processing area may be located inside.

S2, precutting: pre-cut profiles are cut at the edges and in the middle of the processing zone 3, with reference to the positioning holes 21. Because the material flows from the periphery to the middle of the convex hull 31 during embossing, the pre-cut contours are used to provide better material flow and leave a margin for embossing distortion. However, the portion of the processing region 3 farther from the convex hull 31 needs to be kept intact, so that the influence of the embossing is small, and the thickness of the material can be maintained when the first folding surface 12a and the second folding surface 12b are formed.

S3, embossing: and (5) taking the positioning hole 21 as a reference, carrying out convex deformation on the middle part of the precut outline to form a convex hull 31. The convex hull 31 is a structure protruding upward from the original reference surface of the material, so that the material has a difference in height and becomes a preformed structure of the high and low surfaces 11.

S4, trimming: the preform 32 partially connected to the positioning-connection region 2 is formed by cutting out a main contour in the machining region 3 with reference to the positioning hole 21. This step is intended to provide for bending, so that the material that would hinder bending is removed, leaving only a certain amount of connecting material so that the preform 32 can still be positioned by the positioning and connecting zone 2.

S5, bending: the preforming portion 32 is bent along two folding edges 33 perpendicular to the material tape conveying direction with the positioning hole 21 as a reference to form a high-low surface 11 and two folding surfaces (a first folding surface 12a and a second folding surface 12 b) forming a preset included angle with the high-low surface 11, and the two folding edges 33 are overlapped with two transition edges of the convex hull 31. After the convex hull 31 has formed the pre-formed structure of the high and low surfaces 11, the folding of the first and second folded

surfaces

12a, 12b along the two flaps 33 overlapping the transition edges of the convex hull 31 is not hindered by the material itself, so that the included angle is more easily controlled.

S6, shaping: with the positioning hole 21 as a reference, a re-bending, side punching or hole flanging operation is performed on the folded-up surface to deform the material of the preform portion 32 into structural members (the left structural member 1a, the right structural member 1 b). The first and second folded

surfaces

12a and 12b need to be further shaped when there is a structure that requires a re-bending, side punching or flanging operation. The type and sequence of operation of this step depends on the structure of the structure itself.

S7, blanking: the structural component is cut off from the positioning connection region 2 with reference to the positioning hole 21. The structural elements now leave the scrap web as individual products and can thus be assembled or packaged.

The precutting step leaves a craft protrusion 311 at a position close to the folded edge 33, the range of the convex hull 31 comprises the craft protrusion 311, the bending step clamps the craft protrusion 311 to weaken the deformation of the convex hull 31, and the shaping step cuts off the craft protrusion 311 to leave a narrow folded edge 111. The raised craft projections 311 are used to increase the material of the convex hull 31 near the hem 33, since only then is the material strong enough to resist the folding force forming the second folded surface 12b, and until the folding step is completed, the raised craft projections 311 complete their function and are cut off, thus obtaining the final configuration of the narrow hem 111. According to the method, the structural member with the folded edge 33 on the side of the high-low surface 11 is obtained by adopting a mode of firstly raising and then bending, and the process bulge 311 is utilized to help the narrow folded edge 111 to be structurally formed, so that the process is simple, and the structural precision is high.

As shown in fig. 3, the punching step includes an operation of cutting out the side projections 22 at the positioning attachment area 2, and the side projections 22 are folded to the vertical direction in the pre-cutting step as a reference of the tape conveying direction. The side protrusions 22 are erected along the material belt conveying direction, so that the die can guide along the conveying direction and limit in the width direction by utilizing the position of the die, and thus, the deformation of the material belt can be better controlled in the steps of embossing, trimming, shaping and blanking.

As shown in fig. 3, the punching step includes cutting auxiliary positioning holes 34 into the machining area 3, the auxiliary positioning holes 34 being located within the range cut by the trimming step and near the convex hull 31. The auxiliary positioning hole 34 is mainly used to improve the position accuracy of the convex hull 31 during the convex forming, and because the position of the auxiliary positioning hole is close to the position of the convex hull 31, the auxiliary positioning hole helps to improve the position accuracy of the convex hull 31. After the protruding process is finished, the range cut by the trimming step includes the auxiliary positioning hole 34, so the auxiliary positioning hole 34 can not be left on the material belt.

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. A continuous stamping method for a high-low side square strip folding structural part comprises the following steps:

s1, punching: the range of the processing unit comprises a positioning connection area (2) and a processing area (3) in design, the head end and two sides of the material belt are used as positioning, and positioning holes (21) are punched in the range of the positioning connection area (2);

s2, precutting: cutting pre-cut outlines at the edge and the middle of the processing area (3) by taking the positioning hole (21) as a reference;

s3, embossing: taking the positioning hole (21) as a reference, and carrying out convex deformation on the middle part of the precut outline to form a convex hull (31);

s4, trimming: cutting out a main profile on the processing area (3) by taking the positioning hole (21) as a reference to form a preformed part (32) which is partially connected on the positioning connection area (2);

s5, bending: bending the preforming part (32) along two folding edges (33) perpendicular to the material belt conveying direction by taking the positioning hole (21) as a reference to form a high-low surface (11) and two folding surfaces forming a preset included angle with the high-low surface (11), wherein the two folding edges (33) are overlapped with two transition edges of the convex hull (31);

s6, shaping: performing operations of re-bending, side punching or hole flanging on the folded surface by taking the positioning hole (21) as a reference so as to deform the material of the preformed part (32) into a structural member;

s7, blanking: cutting the structural part from the positioning connection area (2) by taking the positioning hole (21) as a reference;

the method is characterized in that:

the pre-cutting step leaves a craft bump (311) at a position close to the folded edge (33), the range of the convex hull (31) comprises the craft bump (311), the bending step clamps the craft bump (311) to weaken the deformation of the convex hull (31), and the shaping step cuts off the craft bump (311) to leave a narrow folded edge (111).

2. The continuous press method of a high-low side square flanged structure according to claim 1, characterized in that: the range of the processing unit comprises a positioning connection area (2) in the middle and two processing areas (3) positioned at two sides of the positioning connection area (2) in the design, and the bending step bends the preformed part (32) along two folding edges (33) perpendicular to the conveying direction of the material belt.

3. The continuous press method of a high-low side square flanged structure according to claim 1 or 2, characterized in that: the punching step comprises the operation of cutting out the side bulges (22) in the positioning connection area (2), and the pre-cutting step folds the side bulges (22) to the vertical direction to be used as the reference of the material belt conveying direction.

4. The continuous press method of a high-low side square flanged structure according to claim 1 or 2, characterized in that: the punching step comprises cutting auxiliary positioning holes (34) in the machining area (3), wherein the auxiliary positioning holes (34) are positioned in the range cut by the trimming step and close to the convex hulls (31).