济南中创试验机
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金属检测设备系列

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Implementation standard and test requirements for wire torsion testing machine?

  • Categories:公司新闻
  • Author:Jnzcgy
  • Origin:济南中创弹簧试验机
  • Time of issue:2020-08-06 10:51

(Summary description)The wire torsion testing machine is used to measure the plastic deformation capacity and surface and internal defects of wire with the diameter (or characteristic size) of 0.1mm ~ 14mm or 0.3mm~10mm of metal wire (steel wire, copper wire, aluminum wire, aluminum alloy wire, etc.) during unidirectional or bidirectional torsion.

Implementation standard and test requirements for wire torsion testing machine?

(Summary description)The wire torsion testing machine is used to measure the plastic deformation capacity and surface and internal defects of wire with the diameter (or characteristic size) of 0.1mm ~ 14mm or 0.3mm~10mm of metal wire (steel wire, copper wire, aluminum wire, aluminum alloy wire, etc.) during unidirectional or bidirectional torsion.

  • Categories:公司新闻
  • Author:Jnzcgy
  • Origin:济南中创弹簧试验机
  • Time of issue:2020-08-06 10:51
  • Views:
Information

The wire torsion testing machine is used to measure the plastic deformation capacity and surface and internal defects of wire with the diameter (or characteristic size) of 0.1mm ~ 14mm or 0.3mm~10mm of metal wire (steel wire, copper wire, aluminum wire, aluminum alloy wire, etc.) during unidirectional or bidirectional torsion.
Applicable standards:
Metal wire torsion testing machine for standard GB/T 239.1 2012 of the People's Republic of China the first part of the metal material wire one-way torsion test method ", GB/T 239.2 2012 "metal material wire two-way torsion test method" in the second part, applies to the international standard ISO 7800:2003 "metal wire one-way torsion test method" and the ISO 9649:1990 "metal wire two-way torsion test method".
Requirements for samples in wire torsion test:
1. The sample should be as straight as possible.
2. When necessary, the sample can be straightened by appropriate methods. During the straightening, the surface of the sample shall not be damaged or the sample shall not be twisted.
Wires with local hard bending should not be used for testing.
Requirements for wire torsion test equipment:
1. The tooth surfaces of the clamping blocks in the testing machine chuck shall be parallel to each other, and the hardness of the clamping blocks shall be ≥55 HRC.
For steel wire with diameter (or characteristic size) of 10 mm~14 mm, suitable hardness clamping block shall be selected for testing according to the hardness of different sample materials. Generally, the hardness of clamping block is recommended to be about 20 HRC higher than the sample hardness.
2. The testing machine itself shall not interfere with the change of collet length caused by sample shrinkage, and the testing machine can apply appropriate tension force to the sample.
During the test, the two collet of the test machine shall be kept on the same axis without any bending force applied to the test piece. One collet of the test machine shall be able to rotate about the axis of the test piece, and the other shall not rotate at all, unless such angular deformation is used for the determination of torque.
In order to adapt to different lengths of samples, the distance between the testing machine chucks should be adjustable and measurable.
3. The speed of the testing machine should be adjustable and equipped with a device to automatically record the number of twists.

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