CN103272960A

CN103272960A - Welding-free circular pipe forming method

Info

Publication number: CN103272960A
Application number: CN2013102204494A
Authority: CN
Inventors: 董伟国; 何海波; 姜承文; 刘挺; 范王磊
Original assignee: ZHEJIANG WEICHI AUTO PARTS CO Ltd
Current assignee: ZHEJIANG WEICHI AUTO PARTS CO Ltd
Priority date: 2013-06-04
Filing date: 2013-06-04
Publication date: 2013-09-04
Anticipated expiration: 2033-06-04
Also published as: CN103272960B

Abstract

The invention relates to a circular pipe forming method, in particular to a welding-free circular pipe forming method. The forming method includes forming a punch forming plate in one step by the aid of a punching machine; subjecting a one-step formed product to first-time punch forming by the aid of a first-time punch forming device; and then subjecting a first-time punch formed product to second-time punch forming by the aid of a second-time punch forming device. The welding-free circular pipe forming method has the advantages that the forming method is cost-saving (the circular pipe is substituted by a low carbon steel plate) and free of machining process, so that a die becomes simple in structure; welding is substituted by riveting process, so that production cost in manufacturing is lowered, sizes are kept constant, while thermal deformation in the welding is avoided; and besides, the welding-free circular pipe forming method is simple to operate and can improve efficiency.

Description

Unjointed shaping round tube method

Technical field

The present invention relates to a kind of shaping round tube method, relate in particular to a kind of unjointed shaping round tube method.

Background technology

Domestic many enterprises all can use short pipe now, and need stamp out the shape of part in each position of circumference of pipe, as square hole, semicircle etc., this type of demand is very big, and it is very high to the requirement of each parameter, dimensional tolerance as the bottom square hole, the position of related features of bottom square hole and upper recess, the ovality of pipe etc., but less demanding to the rigidity of pipe.Machining process route in the past is: 1, choose the pipe blanking (as length 100mm, can select sawing machine, lathe etc.) of same specification, and more consuming time; 2, the square hole of pipe circumferential surface, shapes such as circle need punch press to finish, and as not in a plane, need the position of moulding more, can cause the accumulation of error, may need 3-4 time punch forming (cause consuming time, mould takes increase, the cost of labor rising) simultaneously.

Select for use pipe as raw material, price is higher.

Summary of the invention

At the weak point of above-mentioned technology, the invention provides a kind of saving cost (comprising the cost of raw material, cost of labor, die cost), raise the efficiency forming method easy and simple to handle.

A kind of unjointed shaping round tube method comprises the steps:

The plate punch forming part of making even carries out one-shot forming with punch press, and the product after the moulding can be gone out 4 hasps respectively at two minor face places of flat board, goes out a square hole at the center of flat board, goes out a semicircle at the place, following long limit of flat board;

One-time formed product is carried out the punch forming first time with punch forming device for the first time, product after the moulding is a semicircular flat board in centre, described first time punch forming device by the first time punch forming device patrix and for the first time the punch forming device counterdie form, the centre of counterdie has semi-circular recesses, the lower end of patrix becomes semi-circular shape, matches with the semi-circular recesses of counterdie;

Carry out the punch forming second time with the product after the punch forming for the first time of the punch forming device second time again, used second time, punch forming device was by progressive die, punch forming device patrix for the second time, the punch forming device counterdie is formed for the second time, progressive die moves back and forth along the cavity on the second time punch forming device patrix, a semi-circular recesses is arranged at the bottom of punch forming device patrix for the second time, be provided with same semi-circular recesses in the position corresponding with the semi-circular recesses of punch forming device patrix bottom for the second time, the punch forming device counterdie top second time, simultaneously the second time punch forming device counterdie both sides limited block is arranged.

Preferably, described dull and stereotyped punch forming part is low-carbon steel plate.

Beneficial effect of the present invention is, saves cost (replacing pipe with low-carbon steel plate), has omitted the operation of processing, and it is very simple that mould becomes; Replace welding with riveting process, the production cost of manufacturing is descended, size can not change simultaneously, (welding can produce thermal deformation); Simple to operate, efficient improves.

Description of drawings

Fig. 1 is the structural representation of dull and stereotyped punch forming part;

Fig. 2 is product after the punch forming for the first time;

Fig. 3 is the punch forming device front view first time;

Fig. 4 is the punch forming device front view second time;

Fig. 5 is the punch forming device vertical view second time;

Fig. 6 is the punch forming device left view second time.

The 1-hasp; The 2-square hole; The 3-semicircle; 4-is the punch forming device patrix for the first time; Product after the 5-punch forming for the first time; 6-is the punch forming device counterdie for the first time; The 7-progressive die; 8-is the punch forming device patrix for the second time; Product after the 9-punch forming for the second time; 10-is the punch forming device counterdie for the second time; The 11-limited block

The specific embodiment

Below in conjunction with accompanying drawing the present invention is described in further detail.

A kind of unjointed shaping round tube method comprises the steps:

The plate punch forming part of making even carries out one-shot forming with punch press, and the product after the moulding can be gone out 4 hasps 1 respectively at two minor face places of flat board, goes out a square hole 2 at the center of flat board, goes out a semicircle 3 at the place, following long limit of flat board, as shown in Figure 1;

One-time formed product is carried out the punch forming first time with punch forming device for the first time, and the product after the moulding is a semicircular flat board in centre, as shown in Figure 2; Described first time punch forming device by the first time punch forming device patrix 4 and for the first time punch forming device counterdie 5 form, the centre of punch forming device counterdie 5 has semi-circular recesses for the first time, the lower end of punch forming device patrix 4 becomes semi-circular shape for the first time, with the first time punch forming device counterdie 5 semi-circular recesses match, as shown in Figure 3;

Carry out the punch forming second time with the product after the punch forming for the first time of the punch forming device second time again, used second time, punch forming device was by progressive die 7, the second time, the punch forming device patrix 8, punch forming device counterdie 10 is formed for the second time, as Fig. 4, Fig. 5, shown in Figure 6, progressive die 7 moves back and forth along the cavity on the second time punch forming device patrix 8, a semi-circular recesses is arranged at the bottom of punch forming device patrix 8 for the second time, be provided with same semi-circular recesses in the position corresponding with the semi-circular recesses of punch forming device patrix 8 bottoms for the second time, the punch forming device counterdie 10 tops second time, simultaneously the second time punch forming device counterdie 10 both sides limited block is arranged, when the second time punch forming device patrix 8 down do the time spent, dull and stereotyped punch forming part has been become a pipe, 4 hasps 1 are all realized interference fit simultaneously, at this moment progressive die 7 down moves, home position at hasp 1 stamps out a small rut, make hasp 1 that certain plastic deformation take place, play certain cementation, moulding is finished.

The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a unjointed shaping round tube method is characterized in that, comprises the steps:

One-time formed product is carried out the punch forming first time with punch forming device for the first time, product after the moulding is a semicircular flat board in centre, described first time punch forming device by the first time punch forming device patrix and for the first time the punch forming device counterdie form, the centre of punch forming device counterdie has semi-circular recesses for the first time, there is semicircle the lower end of punch forming device patrix for the first time, and the semi-circular recesses of punch forming device counterdie matches with the first time;

2. forming method as claimed in claim 1 is characterized in that, described dull and stereotyped punch forming part is low-carbon steel plate.