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Processing method of small-caliber coil room-temperature tensile sample

A technology for tensile specimens and processing methods, which is applied in the field of tensile testing, can solve problems such as increasing the difficulty of clamping, difficulty in paralleling the two ends, and affecting the accuracy of results, so as to avoid difficulties in clamping operations, avoid test failures, and ensure accuracy sexual effect

Inactive Publication Date: 2020-11-24
江苏隆达超合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high efficiency, but the two ends are not easy to be parallel, which increases the difficulty of holding, and it is easy to break at the end when stretching, resulting in test failure. At the same time, flattening will cause deformation of the middle part, which will affect the accuracy of the results; (2) put the pipe end Manual straightening, although this method is simple, it is easy to cause deformation of the middle part, which directly leads to distortion of the yield strength, and it is not easy to straighten the two ends on a straight line, which makes it more difficult to hold

Method used

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  • Processing method of small-caliber coil room-temperature tensile sample
  • Processing method of small-caliber coil room-temperature tensile sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Select the H68 brass cold coil with a specification of Φ33×1.35mm to prepare the sample for room temperature tensile test. The processing method of the sample during the tensile test includes the following steps:

[0019] Step 1. Cut a section of sample tube with a length of 800mm from the coiled tube, mark point A and point B with a marker pen in the length direction of the sample tube, the length between point A and point B is 200mm, and the length between point A and point B The sample tube is used as the section to be tested, and the center angle corresponding to the sample tube between point A and point B is 150°;

[0020] Step 2. Straighten the sample tubes on the left side of point A and the right side of point B. The straightening speed is 3m / min. The other end must be supported to ensure that the section to be tested is not deformed;

[0021] Step 3. Cut the left and right straightening sections, and keep the clamping length required for the test, and the clam...

Embodiment 2

[0027] Select the H65 brass cold coil with a specification of Φ6×1mm to prepare the sample for room temperature tensile test. The processing method of the sample during the tensile test includes the following steps:

[0028] Step 1. Cut a section of sample tube with a length of 600mm from the coiled tube, mark point A and point B with a marker pen in the length direction of the sample tube, the length between point A and point B is 150mm, and the length between point A and point B The sample tube is used as the section to be tested, and the center angle corresponding to the sample tube between point A and point B is 175°;

[0029] Step 2. Straighten the sample tubes on the left side of point A and the right side of point B. The straightening speed is 1 / min. The other end must be supported to ensure that the section to be tested is not deformed;

[0030] Step 3. Cut the left and right straightening sections, and keep the clamping length required for the test, and the clamping ...

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Abstract

The invention relates to a processing method of a small-caliber coil pipe room-temperature tensile sample. The method comprises the following steps: cutting a section from a coil pipe as a sample pipe, marking a point A and a point B in the length direction of the sample pipe by using a marking pen, and taking the sample pipe between the point A and the point B as a section to be measured; straightening the sample pipes on the left side of the point A and the right side of the point B to enable the left straightening section and the right straightening section to be coaxially arranged, and supporting the other end during straightening to ensure that the section to be measured is not deformed; cutting the left straightening section and the right straightening section, and reserving the clamping length needed during testing; and carrying out room-temperature tensile test on the sample pipe according to GB / T 228.1. According to the method disclosed by the invention, the end part of the sample pipe is straightened, so that the deformation of the section to be measured (namely a non-clamping part) of the tensile sample is avoided, and the accuracy of a result is ensured; and meanwhile,the problems of test failure and operation clamping difficulty are avoided.

Description

technical field [0001] The invention relates to a processing method for a room-temperature tensile sample of a small-diameter coil, and belongs to the technical field of tensile testing. Background technique [0002] Due to the advantages of long coil length and easy transportation, and the use of coils in devices such as waste heat recovery, the demand for coils is increasing. But the coil is curved, which brings great difficulty to the tensile test. [0003] For a long time, the preparation method of the coil tensile sample is: (1) Mechanical flattening, flattening the two ends of the sample, and then holding it with a flat plate for tensile test. This method has high efficiency, but the two ends are not easy to be parallel, which increases the difficulty of holding, and it is easy to break at the end when stretching, resulting in test failure. At the same time, flattening will cause deformation of the middle part, which will affect the accuracy of the results; (2) put th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/286G01N2001/2873
Inventor 王植栋浦益龙周向东高云龙陈芳
Owner 江苏隆达超合金股份有限公司
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