Prediction method for discrete pre-tightening force of bolt rotation angle method

A prediction method and technology of pre-tightening force, applied to threaded fasteners, screws, instruments, etc., can solve problems such as unpredictability, discrete pre-tightening force, and inability to obtain bolt tightening process, etc., to achieve clear and simple calculation effects

Active Publication Date: 2016-11-16
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology

However, there is no literature or special edition on how to express the pretightening force dispersion of the corner method in engineering. At present, there is no literature or special edition in this regard. Europe and the United States often use the pretightening force increased by 5% to 10% on the basis of the yield point metho

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  • Prediction method for discrete pre-tightening force of bolt rotation angle method
  • Prediction method for discrete pre-tightening force of bolt rotation angle method
  • Prediction method for discrete pre-tightening force of bolt rotation angle method

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Embodiment Construction

[0011] The calculation process of this method is described in detail below in conjunction with the accompanying drawings:

[0012] A method for predicting the discrete pretightening force of the bolt rotation angle method, which is to use the generalized Hooke's law to balance the force of the bolt connection pair in the elastic range, so as to obtain the pretightening force distribution of the rotation angle method; the elastic range is It refers to the fact that the deformation of the bolted joint pair under stress can return to its original size after unloading.

[0013] The parameters needed to calculate the bolt pretightening force are as follows: friction coefficient μ; yield strength σ s ;Torque T; Angle θ; Elastic modulus of bolt E bolt ;Elastic modulus of part A A ;Elastic modulus of part B B ;Outer diameter of bolt flange bearing surface D 1 ; Bolt polished rod diameter D 3 ;Chamfer C; Bolt hole diameter D 2 ; Bolt nominal diameter D bolt ; Bolt pitch P; Part ...

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Abstract

The invention discloses a prediction method for discrete pre-tightening force of a rotation angle method, and the prediction method is mainly used for design and assembling processes of main bolts of engines. The method is divided into two conditions of: in an elastic range, carrying out force balance on a bolt connection pair by utilizing a generalized Hooke's law: a combined computation of <Sigma> F=0 and deformation compatibility <Theta>=(<Delta>Lpull+<Delta>Lpush)*360/P, so as to obtain pre-tightening force distribution of the rotation angle method; and if plastic deformation occurs to the bolt connection pair, adopting a law of conservation of energy: obtaining a false stress greater than real stress and a false strain less than the real strain under elastic assumption, obtaining a real stress and a real strain by adopting the law of conservation of energy, and finally obtaining the pre-tightening force distribution of the rotation angle method through nonlinear iterative computations of force balance and deformation compatibility. The method disclosed by the invention has the advantages of being simple in computation and well-organized.

Description

technical field [0001] The invention relates to a bolt tightening process, which is used in the design and assembly process of automobile parts. Background technique [0002] Auto parts are often bolted, especially in engine assembly. The main bolts of the engine include cylinder block and cylinder head connecting bolts, connecting rod bolts, crankshaft main bearing seat bolts, crankshaft front end center bolts, and flywheel bolts. During the design and simulation analysis of related parts, it is necessary to simulate the assembly load, and the bolt pretightening force is the main assembly load of the related parts. The bolt pretightening force seriously affects the deformation of the related parts during assembly and the working performance Therefore, the bolt connection becomes the most important boundary condition in the design and simulation of related parts, and it is also one of the main factors that affect the assembly quality in the manufacturing process and need to ...

Claims

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Application Information

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IPC IPC(8): G06F17/50F16B35/00
CPCF16B35/00G06F30/15G06F30/17G06F2119/18
Inventor 司庆九詹樟松卿辉斌曾庆强
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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