Processing inspection fixture for special steel tensile sample and inspection method

Abstract

The invention relates to a processing inspection fixture of a special steel tensile sample and an inspection method. The processing inspection fixture comprises an upper fixture and a lower fixture, wherein each of the upper fixture and the lower fixture is of a tower-shaped threaded sleeve structure, and is composed of clamping ends and threaded sleeves; the other ends of the upper and lower clamping ends are respectively mounted in a upper tester jaw and a lower tester jaw; the upper fixture and the lower fixture respectively fix one end of a tensile finished product sample with a threaded head; meanwhile, a tester extensometer is clamped on the tensile finished product sample with the threaded head. According to the invention, the technical problems that the short special steel tensile sample cannot clamp the extensometer and the clamp slipping affects the accuracy of inspection results are solved; the fixture is convenient and rapid to replace, can be recycled, and has long service life; the tensile batch inspection of the special steel products can be completed at low cost by using the processing inspection fixture for the special steel tensile sample and the inspection method.

Description

technical field [0001] The invention belongs to the technical field of special steel tensile inspection equipment, and relates to a special steel tensile sample processing inspection fixture and inspection method. Background technique [0002] Tensile inspection is a mandatory inspection item for factory inspection of special steel products such as high-quality carbon structural steel, low-alloy structural steel, and hardenability-retaining structural steel. The tensile test of special steel products first needs to process a rough sample with a certain diameter and length at the specified part of the bar, and then perform normalizing or quenching and tempering heat treatment on the rough sample, then process it into a finished stretched sample, and finally carry out tensile testing. stretch detection. At present, the processing method of drawing blank samples of special steel usually adopts the hollow drilling machine to process. That is, at the specified part of the bar, ...

AI Technical Summary

Problems solved by technology

There are two problems in the subsequent tensile test process of the short sample: (1) After the short sample of the finished tensile product with a length of less than 120mm is clamped on the existing tensile testing machine, the upper and lower jaw platforms of the tensile testing machine If the spacing is less than 80mm, the extensometer cannot be clamped for tensile test at this time

(2) After ensuring the length of the parallel part of the sample and the length of the transition arc for the finished tensile sample with a length of less than 120mm, the length of the clamping end is less than 20mm, and the clamping length is insufficient, which may easily lead to unstable clamping. It is easy to slip during the process, which affects the accuracy of the tensile performance data. When the slip is severe, it may even lead to insufficient clamping force, and the tensile test cannot be completed.

[0006] The Chinese patent document with the publication number CN103411827A discloses a tensile fixture for a round bar tensile sample. From the information provided in the document, the fixture is connected to the testing machine with a pin structure, and is suitable for the jaw fixture of a specific testing machine. Wedge jaw grips not suitable for common tensile testing machines

In addition, the tensile sample needs to be processed into a pin structure, which is not suitable for batch processing, and due to the high strength and hardness of special steel products, the tensile sample is not suitable for processing the shape of the pin connection structure

Therefore, this technology cannot solve the batch processing and testing needs of special steel tensile samples

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