CN110976690B

CN110976690B - U-shaped piece cross beam riveting process

Info

Publication number: CN110976690B
Application number: CN201911117472.4A
Authority: CN
Inventors: 顾大明
Original assignee: Suzhou Mingfeng Precision Machinery Co ltd
Current assignee: Suzhou Mingfeng Precision Machinery Co ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2021-12-07
Anticipated expiration: 2039-11-15
Also published as: CN110976690A

Abstract

The invention belongs to the technical field of metal piece manufacturing, and relates to a U-shaped piece cross beam riveting process, which comprises the following steps: the method comprises the following steps of strip shape punching, material U-shaped bending, U-shaped piece blanking, beam assembling and riveting, wherein the strip shape punching step is to increase the protruding parts at the edges of two sides of a groove opening of a beam to be assembled, and the riveting step adopts a riveting punch to flatten the protruding parts and deform towards the inner side of a groove. According to the process, the bulge is designed on the edge of the opening of the groove needing to be riveted in the punching step, so that materials can form effective blocking to the cross beam in the riveting step, and the assembling quality is improved.

Description

U-shaped piece cross beam riveting process

Technical Field

The invention relates to the technical field of metal stamping processing, in particular to a U-shaped piece cross beam riveting process.

Background

With the continuous development of stamping technology in China and the continuous increase of automobile market competition pressure, a plurality of parts imported from foreign countries are made into countries.

Fig. 1 shows a U-shaped part 1 for a safety belt retractor of a vehicle, the main body of which is a U-shaped part formed by stamping and bending, and two vertical sides 12 of which are correspondingly provided with grooves 11, and cross beams 2 with bayonets at two ends are assembled in the grooves 11, so that the whole body has better structural strength. As shown in fig. 2, in order to combine the two, it is common practice to press the material of the opening edge of the recess 11 with the clinch punch 3 to deform it a little to the inside so as not to detach the beam 2 from the opening of the recess 11 again. However, in actual processing, it is found that in order to allow the bayonet of the cross beam 2 to be placed in the groove 11, the design width of the bayonet is generally smaller than the width of the groove 11, and the reduction of the opening width of the groove 11 after riveting is limited, so that the cross beam 2 is still easy to fall out of the opening, and the detection and manual adjustment are time-consuming and labor-consuming.

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

Disclosure of Invention

The invention mainly aims to provide a riveting process for a U-shaped part cross beam, which can prevent the cross beam from falling out of a groove of a U-shaped part.

The invention realizes the purpose through the following technical scheme: a U-shaped piece cross beam riveting process comprises the following steps:

firstly, punching the shape of a material belt: carrying out profile punching on the metal material belt under the condition of incomplete cutting, and simultaneously cutting out two grooves for assembling the beam;

bending the material in a U shape: carrying out U-shaped bending by taking the feeding surface of the material belt as a reference to form two mutually parallel vertical surfaces with grooves;

blanking of the U-shaped piece: cutting the body of the U-shaped piece from the material strip;

assembling the beam: clamping bayonets at two ends of the cross beam into the grooves;

riveting: putting the U-shaped part groove provided with the cross beam upwards in a riveting press, and pressing and deforming the edge of the opening of the groove to clamp the cross beam;

in the material strip shape punching step, the protruding parts are added at the edges of two sides of the opening of the groove of the beam to be assembled, and in the riveting step, the protruding parts are flattened by adopting a riveting punch and are deformed towards the inner side of the groove.

Specifically, the height of the protruding part is 1-2mm higher than the reference plane of the opening of the groove.

Specifically, the riveting adopts a riveting punch with a plane structure on the lower surface.

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

according to the process, the bulge is designed on the edge of the opening of the groove needing to be riveted in the punching step, so that materials can form effective blocking to the cross beam in the riveting step, and the assembling quality is improved.

Drawings

FIG. 1 is a perspective view of a U-shaped member and cross member assembly;

FIG. 2 is a schematic diagram illustrating a riveting principle in the prior art;

FIG. 3 is a schematic diagram of the structure of a die cut profile adjacent a groove of the present technique;

fig. 4 is a schematic diagram of the riveting principle of the present technology.

The figures in the drawings represent:

1-U-shaped piece, 11-groove, 12-facade, 13-boss;

2-beam, 21-bayonet;

3-riveting punch and 3' -riveting punch.

Detailed Description

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

As shown in fig. 3 and 4, the riveting process of the U-shaped cross member of the invention comprises the following steps:

firstly, punching the shape of a material belt: the metal strip is subjected to contour punching under the condition of incomplete cutting, and two grooves 11 for assembling the cross beam 2 are cut at the same time;

bending the material in a U shape: bending the material belt feeding surface in a U shape to form two mutually parallel vertical surfaces 12 with grooves 11;

blanking of the U-shaped piece: cutting the body of the U-shaped member 1 from the strip of material;

assembling the beam: clamping bayonets at two ends of the cross beam 2 into the grooves 11;

riveting: putting the groove 11 of the U-shaped part 1 provided with the cross beam 2 upwards in a riveting press, and pressing and deforming the opening edge of the groove 11 to clamp the cross beam 2;

in the strip shape punching step, the protruding parts 13 are added at the edges of two sides of the opening of the groove 11 of the beam 2 to be assembled, and in the riveting step, the protruding parts 13 are flattened by adopting a riveting punch 3' and are deformed towards the inner side of the groove 11.

The process steps are not increased or decreased, the largest change is only the die-cutting die structure, and the die-opening cost is not changed greatly. Because bellying 13 has left the surplus that the recess 11 opening warp, does not have very big requirement to the structural accuracy, bellying 13 can warp to become the closed angle that extends from recess 11 opening to the inside when the riveting, just so can play effectual barrier effect to the bayonet socket of crossbeam 2, so both are difficult to break away from, so this technique has promoted the equipment quality.

As shown in fig. 3, the height of the projection 13 is higher by 1-2mm than the reference plane of the opening of the groove 12. Generally, the opening width of the groove 12 can be reduced by a distance equivalent to the height of the groove after the bulge parts 13 are flattened, the opening of the groove 12 can be reduced by about 2mm after the bulge parts 13 on two sides are flattened together, and the distance is enough to overcome the inward reduction width of the bayonet relative to the groove 11, so that the assembly reliability is ensured.

As shown in fig. 4, the riveting punch 3' having a planar structure on the lower surface is used for riveting. Because the bulge 13 provides the material with inward deformation, the riveting punch 3' only needs to be designed into a simple plane shape, and compared with the riveting punch in the prior art, the structure is simpler, and the mold opening cost is lower.

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 U-shaped piece cross beam riveting process comprises the following steps:

the method is characterized in that:

2. A U-shaped cross-piece riveting process according to claim 1, wherein: the height of the protruding part is 1-2mm higher than the reference plane of the opening of the groove.

3. A U-shaped cross-piece riveting process according to claim 1, wherein: and the riveting punch with a plane structure on the lower surface is adopted for riveting.