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A double-shear test fixture for high-strength fasteners

A fastener and high-strength technology, which is applied in the direction of applying stable shear force to test the strength of materials, can solve the problems of inaccurate test data, deformation, and short service life of double-shear test fixtures, etc., to prolong the service life, The effect of ensuring accuracy

Active Publication Date: 2015-12-02
河南航天精工制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a tool suitable for double shear test of high-strength fasteners, so as to solve the serious deformation, inaccurate test data and the problem of double shear test of current double-shear test tool when performing double-shear test of high-strength fasteners. The problem of short service life of tooling

Method used

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  • A double-shear test fixture for high-strength fasteners
  • A double-shear test fixture for high-strength fasteners
  • A double-shear test fixture for high-strength fasteners

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Such as Figure 2 to Figure 4 As shown, the high-strength fastener double-shear test fixture of this embodiment includes an upper blade 1 , a lower blade 2 and a base 3 . The lower end surface of the upper blade 1 is provided with a groove, and the surface of the groove wall is inlaid with cemented carbide 1-1; the lower blade 2 has a bottom and two ends extending upward from the bottom and arranged symmetrically at intervals. Coaxial and symmetrical round holes for fasteners to be inserted are respectively opened on both ends. Carbide 2-1 is inlaid in the two round holes, and a groove closely matched with the lower blade 2 is arranged on the base 3 .

[0019] When using the high-strength fastener double-shear test fixture of this embodiment, first put the lower blade 2 into the groove of the base 3 to make it closely fit with the groove of the base, and then place the fastener sample 7 on the lower blade 2, and then put the upper blade 1 into the groove of the lower b...

Embodiment 2

[0021] Such as Figure 5 As shown, the difference between the high-strength fastener double-shear test fixture of this embodiment and that of Embodiment 1 is that the lower blade is formed by butting two L-shaped parts 22 in section, and the two ends of the lower blade are respectively formed by two The vertical section of the L-shaped part 22 is formed. The bottom of the lower blade is formed by the butt joint of the horizontal sections of the two L-shaped parts 22. It is placed in the groove of the base and closely matched with the groove wall of the base. The lower blade is two L-shaped parts. Easy to process and manufacture.

[0022] In each of the above embodiments, the cemented carbide layer can only be embedded on the wall surface of the upper blade groove, or the cemented carbide layer can only be embedded on the surface of the lower blade hole wall. It is also possible not to inlay the cemented carbide layer at the same time.

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Abstract

The invention discloses a high-strength fastening piece double-shear testing tool, which comprises a lower blade and an upper blade of which the lower end face is provided with a groove, wherein the lower blade is provided with a bottom part and two end parts which extend upwards from the bottom and are symmetrically arranged at intervals; round holes through which fastening pieces are inserted are respectively formed in the two end parts of the lower blade, and the fastening pieces are coaxially and symmetrically arranged; a hard alloy layer is inlaid on the surface of the wall of the groove of the upper blade; and another hard alloy layer is inlaid on the surface of the wall of the round hole of the lower blade. By adoption of the double-shear testing tool, the shearing hole of the lower blade is round during a high-strength fastening double-shear test, the round hole is difficult to deform relative to the concave groove, and the accuracy of the double-shear test data is guaranteed; and moreover, the hard alloy layer is inlaid on the surface of the wall of the groove of the upper blade, so that the groove of the upper blade is difficult to deform, and the hard alloy layer is inlaid on the surface of the wall of the round hole of the lower blade, so that the round hole of the lower blade is difficult to deform.

Description

technical field [0001] The invention relates to a double-shear test tool for fasteners, in particular to a double-shear test tool for high-strength fasteners, and belongs to the technical field of mechanical fastener tests. Background technique [0002] At present, the double-shear test tooling of domestic fasteners is generally implemented in accordance with the regulations in GJB715.26A-2008. Such as figure 1 As shown, the double-shear test fixture specified in GJB715.26A-2008 includes a base 6, an upper blade 4 and a lower blade 5, the lower end surface of the upper blade 4 is provided with a groove, and the lower blade 5 has a bottom and extends upward from the bottom, spaced The two ends are symmetrically arranged side by side, and the upper parts of the two ends are respectively provided with coaxially symmetrical semicircular grooves. When using the double-shear test tool, first insert the lower blade 5 into the groove of the base 6, then put the fastener sample int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24
Inventor 王超郭启义谢田许彦伟胡庆宽黄帅冯德荣程全士
Owner 河南航天精工制造有限公司