CN104551226A - Cutting method for testing axial residual stress of seamless tube - Google Patents

Abstract

The invention relates to a cutting method for testing axial residual stress of a seamless tube. The cutting method is characterized by comprising the following steps of cutting out a seamless tube which is 1000mm long from one end of a to-be-tested bar to serve as a tested piece; measuring for 15mm to two sides respectively from the central position in the length direction of the tested piece, and respectively describing two circles vertical to the axis; then, cutting along the two described circles to form a circular ring which is 30mm wide. The cutting method has the advantages that the method is simple, cutting position selection is reasonable, and the axial residual stress of the seamless tube can be rapidly and accurately tested.

Description

A kind of cutting method of testing the axial unrelieved stress of solid drawn tube

Technical field

The present invention relates to a kind of cutting method of testing the axial unrelieved stress of solid drawn tube, belong to detection technique field.

Background technology

What unrelieved stress physical test method adopted has: x-ray method, method of magnetic, brittle coating method, optical method, acoustic method, electric resistance strain film method, wherein: electric resistance strain film method is a kind of method of relatively generally acknowledging both at home and abroad, the residual stress test of rail adopts paster method at present, performs European EN13674-1 standard.Up to the present, the residual stress test method of weldless steel tube does not have standard, and part adopts the method estimation of theory calculate, and adopt paster method actual measurement to have no report, also nobody studies specially, and the STRESS VARIATION at each position of steel pipe is all unclear.

Adopt electric resistance strain film method (paster method) to test the axial unrelieved stress of solid drawn tube, need counter stress to discharge, how to cut tested solid drawn tube and cut direction is the key detected, the selection of cutting position seems particularly important.

Summary of the invention

The object of the invention is, in order to fast, accurately detect the axial unrelieved stress of solid drawn tube, to provide a kind of cutting method of testing the axial unrelieved stress of solid drawn tube.

Technical scheme of the present invention is as follows:

The seamless pipeline section of long 1000mm is intercepted as detection piece from bar one end to be detected, in the center of the length direction of detection piece respectively to two-sided measurement 15mm, and draw two circles perpendicular to axis respectively, then cut along drawn circle, cut out the annulus of a wide 30mm.

Advantage of the present invention is: method is simple, and cutting position is selected rationally, to detect the axial unrelieved stress of solid drawn tube fast and accurately.

Accompanying drawing explanation

Fig. 1 is cutting position schematic diagram of the present invention.

Embodiment

With reference to accompanying drawing, the seamless pipeline section of long 1000mm is intercepted as detection piece 1 from bar one end to be detected, in the center of the length direction of detection piece respectively to two-sided measurement 15mm, and draw two circles perpendicular to axis respectively, then cut along drawn circle band saw, cut out the annulus of a wide 30mm.

Because the stress surveyed is axial unrelieved stress, so cut direction is detection piece circumferencial direction, make workpiece when not fettering, release stress, weldless steel tube force-bearing situation could be measured truly, cut direction is incorrect, and the stress value measured is not meridional stress value, or does not measure result or data are inaccurate.

Claims (1)

1. test the cutting method of the axial unrelieved stress of solid drawn tube for one kind, it is characterized in that: intercept the seamless pipeline section of long 1000mm from bar one end to be detected as detection piece, in the center of the length direction of detection piece respectively to two-sided measurement 15mm, and draw two circles perpendicular to axis respectively, then cut along drawn circle, cut out the annulus of a wide 30mm.