Calculation method for bolt rotation angle method-based tightening process

A calculation method and bolt technology, applied in calculation, computer-aided design, special data processing applications, etc., can solve the problems of long test period, high test repeatability, high cost, etc., and achieve the goal of improving bolt tightening efficiency and ensuring reliability Effect

Inactive Publication Date: 2017-11-10
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design of the existing angle method tightening process has not been calculated. It is necessary to estimate the initial torque and rotation angle based on experience, and then carry out bolt test verification. The test repeatability is large, the test cycle is long, and the cost is high.

Method used

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  • Calculation method for bolt rotation angle method-based tightening process
  • Calculation method for bolt rotation angle method-based tightening process
  • Calculation method for bolt rotation angle method-based tightening process

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Embodiment Construction

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the solution will be further described in detail below in conjunction with specific embodiments.

[0027] An embodiment of the present invention provides a calculation method for the bolt rotation angle method tightening process, including the calculation of the initial tightening torque and the calculation of the rotation angle, wherein,

[0028] First calculate the initial moment, the formula for calculating the initial moment is:

[0029] T=0.2×F s ×D,

[0030] Among them, F s Refers to the pre-tightening force under the initial moment, D is the nominal diameter of the thread;

[0031] f s =Z×S 0.2 ×A s , among them, Z is the preload coefficient, the general value is 0.2, S 0.2 is the bolt yield strength, A s refers to the nominal stress cross-sectional area of ​​the bolt, and

[0032] Among them, d 2 is the pitch diameter of the thread, d 3 ...

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Abstract

The invention relates to the technical field of a bolt tightening process and discloses a calculation method for a bolt rotation angle method-based tightening process. The method comprises the steps of calculating an initial tightening torque and calculating a rotation angle, wherein the initial tightening torque and the rotation angle are obtained by calculation through basic parameters of a bolt and related constants. According to the calculation method, the initial tightening torque and the rotation angle can be obtained before a bolt tightening test is performed by utilizing a rotation angle method, so that the efficiency and reliability of the bolt tightening test are improved.

Description

technical field [0001] The invention relates to the technical field of bolt tightening technology, in particular to a calculation method for a bolt rotation angle method tightening technology. Background technique [0002] Cylinder head bolts are one of the main high-strength bolts of the engine, which play the role of connecting and fastening the cylinder block and cylinder head. If the fastening performance of the cylinder head bolts is insufficient, it will cause the engine to leak air and water and stop working. [0003] Cylinder head bolts are usually tightened by the angle method, which controls the relative angle between the bolt head and the thread, and is not affected by the friction coefficient of each part, so the axial force dispersion can be controlled to be small. There is no calculation in the design of the existing angle method tightening process. It is necessary to estimate the initial torque and rotation angle based on experience, and then carry out bolt te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/18
Inventor 赵礼飞胡必谦胡志胜高巧徐勋喻昆兰剑林欣欣
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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