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Spinning method

A processing method and technology to be processed, applied in the direction of engine components, mechanical equipment, etc., can solve the problems of impossible reuse of foamed resin, difficult to take out foamed resin, low productivity, etc., to prevent wrinkles, improve processing speed, and restrain elastic deformation. Effect

Inactive Publication Date: 2011-12-21
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to take out the foamed resin from the opening of the pipe end, and the productivity is low.
Also, the foamed resin used as filling material is completely impossible to reuse
Therefore, the foamed resin utilization technique proposed in Patent Document 1 results in increased cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] As a sample, a ferritic stainless steel electric welded steel pipe with an outer diameter of 150 mm was used. At this time, three types of steel pipes with blank plate thicknesses of 0.8 mm, 1.05 mm, and 1.2 mm were used.

[0047] As the core member, a cold rolled steel sheet for spring (JISG4802, S55C-CSPB) with a thickness of 0.5 mm as a blank, a winding body having a diameter of 150 mm and a width of 100 mm is used.

[0048] Insert the above spring steel plate winding body into the pipe ends of the above three types of processed steel pipes, and the processing roller rotates at a speed of 600 rpm while contacting the processed steel pipe, and at a feed speed of 6000 mm / min, 11 passes at 60% The diameter reduction ratio (diameter reduction ratio) is reduced until the outer diameter of the tube end is 90mm.

[0049] When the thickness of the blank steel pipe is 0.8mm, even if the core member is used or not, wrinkles will occur before the diameter is reduced to 60% of the dia...

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Abstract

The present invention provides a spinning processing method, using a processing roller disposed on the outer periphery of a processed pipe body and relatively revolving around the processed pipe body, Moving upward while reciprocating in the axial direction, thereby reducing the diameter of the above-mentioned processed pipe body, at this time, inserting a winding body composed of an elastic plate-shaped material such as a spring steel plate as a core member into the processed pipe body In the state where the inner side of the pipe of the diameter reduction processing part is finished, the diameter reduction processing is performed by the above-mentioned processing roller.

Description

Technical field [0001] The present invention relates to a method for forming a reduced diameter portion at the pipe end of a metal pipe body such as a steel pipe used in an automobile converter housing and a muffler. Background technique [0002] In the case of an exhaust gas purification catalyst (converter) or a muffler (muffler) equipped in the exhaust system of an automobile, a large-diameter pipe is used as a blank because it needs to increase the capacity. Furthermore, the end of the case member is provided with a tapered portion in order to be connected to the front and rear members, and, if necessary, is provided with a small-diameter straight pipe portion connected to the tapered portion. [0003] figure 1 The following example is shown: this type of housing 1 consists of a blank, that is, a large-diameter tube part (1c), a tapered part (1b) provided for connection with the front and rear components, and a straight small diameter continuous with the tapered part. The tube...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D41/04B21D22/16B21D53/84
CPCB21D22/16B21D41/04
Inventor 狩野忍安藤彰启黑部淳
Owner NISSHIN STEEL CO LTD
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