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Method for improving anti-slackness of steel bolt

A bolt and relaxation technology, which is applied in the field of improving the relaxation resistance of steel bolts, and can solve the problem of low degree of improvement in relaxation resistance

Inactive Publication Date: 2004-04-28
HONDA MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the degree of improvement in the relaxation resistance of the bolts treated with blue is very low. Therefore, it is currently desired to further improve this relaxation resistance.

Method used

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  • Method for improving anti-slackness of steel bolt
  • Method for improving anti-slackness of steel bolt
  • Method for improving anti-slackness of steel bolt

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0020] figure 1 The steel bolt 1 shown in (a) is a bolt for carrying out the method of improving the relaxation resistance, and it has a bolt head 4. This screw head 4 is formed by a hexagonal part 5 and a flange part 6 .

[0021] The steel bolt 1 is manufactured through the following steps. That is, the process of performing steel wire toughening treatment on the wire rod such as piano wire; the process of performing surface treatment on the above-mentioned wire rod; the process of performing drawing processing on the above-mentioned wire rod; Process of steel bolt 1.

[0022] Such as figure 2 As shown in (a) and (b), when the method of improving the loosening resistance of the steel bolt 1 is implemented, the bolt holding tool 7 is used. The above-mentioned bolt holding tool 7 is made of steel, one end surface 8 of which is open, and has a hole portion 9 having a diameter larger than the threaded shaft 3 of the steel bolt 1, and communicating with the hole portion 9, a...

no. 2 example

[0031] In this example, if image 3 (a), Figure 4 As shown in (a), the length L of the hole 9 of the bolt holding tool 7 7 made than the length L of the hole portion 9 in the above-mentioned embodiment 1 is also shorter, i.e., set L 7 1 , when the externally threaded part 2 of the same steel bolt 1 as above is screwed into the internally threaded holding hole 10 of the bolt holding tool 7, the screwed-in length exceeds the screwed-in length L 2 . and with this excessive screw-in length L 8 .

[0032] Such as image 3 (b), Figure 4 As shown in (b), in the state where the shaft-shaped portion 11 is subjected to the above-mentioned tensile stress, in the region A subjected to the stress load 1 Between the screwed-in part B during tightening, there is a region without stress load, that is, a part b with a normal pitch.

[0033] Such as image 3 As shown in (c), when the heat-treated steel bolt 1 is removed from the bolt holding tool 7, in the same stress load and heate...

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PUM

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Abstract

Provided is a method for greatly improving relaxation resistance in a steel bolt by adopting a relatively simple means. The steel bolt 1 having a bolt head 4 is prepared at one end of a screw shaft 3 having an external thread section 2 that is screwed into an internal thread hole 12 in a member 13. The external thread section 3 is screwed into a retention hole 10 having an internal thread in a bolt retaining tool 7 at least by a screwing length L2 or more in clamping while being screwed into the internal thread hole 12 in the member 13 in use. Then, a tensile stress in the direction of an axis exceeding the elastic limitation of a part 11 is applied to the axial section 11 between a screwing end terminal (a) in the external thread section 2 and the bolt head 4 in the screw shaft 3, and the axial section 11 is set to be a region A1 where stress is applied. After that, heat treatment is made to a region A1 where stress is applied, where a heating temperature T is 200DEG C<=T<=300DEG C, and the region A1 is set to be a region A2 that is loaded with stress and is heated.

Description

technical field [0001] The present invention relates to a method for improving the relaxation resistance of steel bolts. Background technique [0002] Steel bolts have a bolt head at one end of a threaded shaft with an externally threaded portion screwed into an internally threaded hole in a part. When another part with a bolt hole is superimposed on a part with an internally threaded hole, the When the externally threaded part passes through the bolt hole and is screwed into the internally threaded hole, the non-screwed part between the end of the threaded shaft with the externally threaded part screwed into the internally threaded hole and the bolt head is subject to axial force. tensile stress. Due to the plastic processing such as drawing and heat treatment in the process of manufacturing steel bolts, many dislocations are generated inside the crystal lattice. Therefore, under the above-mentioned tensile stress, Elongation due to the movement of dislocations occurs in ...

Claims

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Application Information

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IPC IPC(8): F16B31/02C21D8/06C21D9/00F16B35/00
Inventor 高岛光男森诚治高田健太郎饭田善次
Owner HONDA MOTOR CO LTD