CN1095719C

CN1095719C - Method for making pipe with flange plate

Info

Publication number: CN1095719C
Application number: CN97115547A
Authority: CN
Inventors: 高桥则行; 久保義贵; 荻原猛
Original assignee: Chiyoda Automotive Industry Co ltd; Hino Motors Ltd
Current assignee: Chiyoda Automotive Industry Co ltd; Hino Motors Ltd
Priority date: 1997-06-27
Filing date: 1997-06-27
Publication date: 2002-12-11
Anticipated expiration: 2017-06-27
Also published as: CN1203846A

Abstract

The present invention relates to a simple processing method for enhancing the fatigue strength of the combining site of a flange and a pipe. The method can enhance production rate and reduce cost. In the specific method, a reinforcing pipe 2 of which the outer diameter is smaller than the inner diameter of a main pipe 1 is inserted into the main pipe 1 which is welded with a flange 3 at the 5a position of the welding position; the reinforcing pipe 2 and the main pipe 1 are together enlarged to an enlarging pipe D2 by an enlarging tool, and then, the reinforcing pipe 2 is tightly connected to the main pipe 1.

Description

The method for making pipe of flanged dish

The invention relates to method for making pipe at the flanged dish of the chimeric welding flange of periphery port of pipe.

For example, the binding site that starts pusher side at the blast pipe of automobile exhaust system is equipped with ring flange.Its general structure is responsible for 1 pipe end neighboring and is equipped with ring flange 3 as shown in Figure 7, and with ring flange 3 be responsible for 1 pipe end neighboring and link together by welding 5.

The joint portion of starting pusher side of the blast pipe of automobile exhaust system is subjected to the influence jolting of road surface etc. of engine luggine, exhaust, the vibration in joint portion own, exhaust high temperature, vehicle easily, in aforesaid prior art structure, because the phenomenon that near the section of the weld part 5 of ring flange 3 can cause sudden change stress to concentrate, so can produce the crack that causes owing to fatigue damage at the pipe end place that is responsible for 1.

For overcoming in this, as shown in Figure 8, the pipe 9 that will gradually change with the wall thickness section that methods such as cutting process is pressed in the pipe end of rabbeting the person in charge 1, behind the neighboring of pipe 9 interlocking ring flange 3, ring flange 3 and pipe 9 are welded together, in addition, adopted and to have managed 9 and be responsible for 1, because of the gradual change wall thickness section mitigation stress of aforementioned tubes 9 at welding position 5c place welded structure.

But, under the situation of using this structure, diminish owing to have the internal diameter of the pipe 9 of wall thickness section, has the problem that flow resistance increases, and processing has caused the cost rising to manage 9 cutting and be pressed into etc., in addition, and the investment problem of the equipment of being responsible in the time of also must considering to be pressed into such as mounting board utensil.

In addition, Figure 9 shows that other measure, interlocking has reinforced pipe 2 in being responsible for 1 internal diameter, decide with institute that 1 side face will be responsible for spot welding S in the interval and reinforced pipe 2 links together on every side, in the neighboring interlocking of being responsible for 1 ring flange 3 is arranged, the ring flange 3 and the person in charge 1 are in weld part 5 welding.

In this case, spot-welding part produces the wall thickness sudden change meeting generation stress of thermal stress because of reinforced pipe 2 inner ends 3.In addition, increase, then can cause spot welding S difficulty, so must carry out strictness control the difference of being responsible for 1 internal diameter and reinforced pipe 2 outer diameter D 3 sizes if be responsible for outer diameter D 3 difference in size of 1 internal diameter and reinforced pipe 2.Control under the situation of the difference of being responsible for 1 internal diameter and reinforced pipe 2 outer diameter D 3 sizes in this strictness, can cause to be difficult for making reinforced pipe 2 to insert problems such as interlockings.

The purpose of this invention is to provide a kind of method for making pipe that improves the flanged dish of ring flange and pipe binding site fatigue strength, this method is processed simply, can be boosted productivity, reduce cost.

For achieving the above object, the present invention takes following technical scheme: a kind of manufacture method of pipe of flanged dish, it is characterized in that, the chimeric ring flange that is welded with on the pipe end outer peripheral face of being responsible for, in the pipe end of this person in charge's described ring flange installation position, insert the external diameter reinforced pipe littler than this person in charge's internal diameter, with expansion go into operation tool described reinforced pipe and be responsible for carry out expander together after, the reinforced pipe and the person in charge are adjacent to, the outer peripheral face of ring flange with the person in charge's who has carried out expander pipe end matched, again the outer peripheral face of ring flange and the person in charge's outer peripheral face are welded, and the inner peripheral surface of ring flange and the end face of the person in charge and reinforced pipe are welded.The present invention has positive effect: adopt above-described the present invention, with the existing expansion tool that goes into operation, can improve the intensity of being responsible for the welding flange position with simple method, and can not improve circulating resistance, and can boost productivity, reduce cost, particularly vibration, the vibration of exhaust itself, exhaust high temperature, the vehicle that is subjected to engine easily there is remarkable result at the blast pipe of the automobile exhaust system that jolting of road surface etc. influences.

Be the simple declaration of drawing below

Fig. 1 assembles the sectional drawing at position with the ring flange that the inventive method is made;

Fig. 2 is the enlarged drawing of A part among Fig. 1;

Fig. 3 is the go into operation sectional drawing of tool 1 example of the expansion as expander processing;

Fig. 4 is the sectional drawing with another modification at the manufacturing ring flange assembling position of the inventive method;

Fig. 5 is the sectional drawing with another modification at the manufacturing ring flange assembling position of the inventive method;

Fig. 6 is the sectional drawing with another modification at the manufacturing ring flange assembling position of the inventive method;

Fig. 7 is the sectional drawing of the equipped structure of general in the past structure flanges dish

Fig. 8 is the figure of structure section in the past that ring flange welding position intensity is improved;

Fig. 9 is the figure of structure section in the past that ring flange welding position intensity is improved.

Following according to figure explanation embodiments of the invention.In Fig. 1, the 1st, external diameter is the person in charge of D1.Be responsible for the pipe the inner that will assemble aftermentioned ring flange 3 of 1 at this, insert external diameter than the little reinforced pipe 2 of internal diameter of being responsible for 1, with the expansion tool that goes into operation is the part of described reinforced pipe 2 and the remaining person in charge 1 expander together after the D2, reinforced pipe 2 is adjacent on the person in charge 1, ring flange 3 is entrenched on the person in charge 1 the pipe outer peripheral face that expander is D2, the outer peripheral face of ring flange 3 and the person in charge 1 outer peripheral face are welded at welding position 5a place, and the end face of the inner peripheral surface of ring flange 3 and the person in charge 1 and reinforced pipe 2 welds at welding 5b place together.

The expansion that the aforementioned person in charge 1 and reinforced pipe 2 is become expander D2 goes into operation tool as shown in fig. 3, by several divided extruded member 6 on the circumference with the radially scalable diminished shaft of extruded member 67 is constituted, wherein the axle center of this several divided extruded member 6 is moved in axial advance and retreat by driver drives such as cylinders, is existing general used expanding tool as the instrument of expander.

When using such expanding tool, at the reinforced pipe 2 of Fig. 1 inner surplus and be responsible among the 1 expander D2 that forms together, the insertion end of the pipe end at expanding tool place is littler than the inner face of reinforced pipe 2, radially the extruder member 6 of Cha Ruing radially expands out, inner surplus of reinforced pipe 2 and be responsible for 1 and can form expander D2 together like this, the result as shown in Figure 2, the inner end portion of reinforced pipe 2 and be responsible for 1 between form space 4.

After above-mentioned reinforced pipe 2 is formed expander D2 together with the person in charge 1, reinforced pipe 2 is adjacent on the person in charge 1, the section factor that makes the outer peripheral face of ring flange 3 and be responsible for the welding portion 5a that 1 outer peripheral face welds together is improved and stress reduces, and reinforced pipe 2 inner ends and be responsible between 1 gap 4 that forms and relaxed contact stress have further reduced stress.

In addition owing to be responsible for the reinforced pipe 2 that inserts in 1 and be responsible for 1 and form expander D2 together, the internal diameter of reinforced pipe 2 in fact become with expander D2 before the person in charge 1 internal diameter roughly the same, do not had the such defect of circulating resistance rising.

Fig. 4 is other modification of relevant the inventive method.This situation is that expansion is gone into operation till tool inserts reinforced pipe 2 the inners, reinforced pipe 2 is all formed expander D2 jointly with the person in charge 1, form with above-mentioned Fig. 1 is the same, the section factor that makes the outer peripheral face of ring flange 3 and be responsible for the welding portion 5a of 1 outer peripheral face welding is improved and has lowered stress, has not had circulating resistance such defect that rises.

In aforementioned form shown in Figure 1 and form shown in Figure 2, the person in charge of equipped ring flange side is with one side with the end face of reinforced pipe 2, but as shown in Figure 5, it also is feasible that the person in charge 1 the end face and the end face of reinforced pipe 2 have the step of suitable length.

In addition, as shown in Figure 6, if with the reinforced pipe 2 inner corresponding persons in charge 1 on position 8 preheatings, and the same reinforced pipe 2 of Fig. 2 inner and be responsible for 1 between can form space 4.

It is indispensable that the outer peripheral face of ring flange 3 and the person in charge's 1 outer peripheral face weld part 5a welds, but the welding at the end face 5b on the throne place of the interior week of ring flange 3 and the person in charge 1 and reinforced pipe 2 is omissible.

Claims

1, a kind of manufacture method of pipe of flanged dish, it is characterized in that, the chimeric ring flange that is welded with on the pipe end outer peripheral face of being responsible for, in the pipe end of this person in charge's described ring flange installation position, insert the external diameter reinforced pipe littler than this person in charge's internal diameter, with expansion go into operation tool described reinforced pipe and be responsible for carry out expander together after, the reinforced pipe and the person in charge are adjacent to, the outer peripheral face of ring flange with the person in charge's who has carried out expander pipe end matched, again the outer peripheral face of ring flange and the person in charge's outer peripheral face are welded, and the inner peripheral surface of ring flange and the end face of the person in charge and reinforced pipe are welded.