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A method of tightening bolts

A bolt and angle method technology, applied in the field of bolt tightening, can solve the problem of increasing the specific weight of the engine

Active Publication Date: 2020-10-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if the conventional torque tightening method is used for important positions that need to be assembled multiple times, such as the main bearing hole and the big end hole of the connecting rod, the clamping force fluctuation will be large each time. In order to reduce the fluctuation of the clamping force The impact on the size and processing quality of the parts needs to increase the rigidity of the clamped parts (such as the body, connecting rod, etc.), which virtually increases the specific weight of the engine

Method used

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Embodiment 1

[0025] Such as image 3 Shown is the tensile force curve of the bolt, and the tensile force curve is a function between the tensile force and the deformation of the bolt. Such as image 3 It can be seen that there is a σ in the tensile force curve 0.2 The yield limit point, before the yield limit point, is the elastic deformation zone of the bolt, and after the yield limit point, it is the plastic deformation zone of the bolt. In the elastic deformation zone, if the elastic modulus is constant, according to Hooke's law F=KX, The pretightening force F is only related to the bolt elongation X, and the elongation is proportional to the angle of rotation. Therefore, the torque rotation angle method has fewer influencing factors than the simple torque tightening method, and not only completes the tightening control with high precision , and fully improve the utilization rate of materials.

[0026] Such as Figure 4 As shown, it is the tightening curve of the bolt. The essence o...

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Abstract

The invention discloses a bolt tightening method. Compared with an existing bolt elastic region torque tightening method, the bolt tightening method has the advantages that after a bolt is tightened,the stabler clamping force can be achieved, the assembling accuracy of parts which need to be assembled and processed, such as an engine body and a connecting rod is guaranteed, and the stability andthe reliability of assembly of the parts are improved. Meanwhile, the specification of the bolt can be reduced as much as possible on the premise that the clamping force is guaranteed, the mass and the size of an engine can be reduced, and the higher specific weight of the engine can be pursued.

Description

technical field [0001] The invention relates to the field of engine bolts and assembly, in particular to a bolt tightening method. Background technique [0002] Nowadays, when designing small-bore engines, they are pursuing higher specific weight, that is, smaller mass volume and greater power. Therefore, the rigidity of the part design is much smaller than that of a large engine, and it is more sensitive to the pre-tightening force of the bolts. [0003] At present, conventional bolts are bolts tightened by the torque method used in the elastic zone. The axial pretightening force generated by this kind of bolt is extremely affected by factors such as the machining accuracy of the friction pair, roughness, lubrication conditions, and tightening speed, resulting in relatively low control accuracy of the axial pretightening force, and the dispersion of the pretightening force is sometimes Up to ±40%. When the friction coefficient is large, the minimum pre-tightening force c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25B27/14
CPCB25B27/143
Inventor 张浩郭进举王海渊王伟杨震于学全白莹张东平张俊梅韩丽丽刘霞
Owner BC P INC CHINA NAT PETROLEUM CORP
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