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Method for determining normal contact rigidity of loaded joint part by considering interaction effect of micro-bulges on rough surfaces

A technology of contact stiffness and rough surface, which is applied in the field of determining the normal contact stiffness of mechanical joints, can solve problems such as inaccurate calculation of joint contact stiffness, achieve the advantages of scale independence, wide application range, and strong operability Effect

Active Publication Date: 2017-05-24
NORTHEASTERN UNIV
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Problems solved by technology

Therefore, in the case of heavy load, the contact stiffness of the joint cannot be accurately calculated using the aforementioned theoretical method

Method used

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  • Method for determining normal contact rigidity of loaded joint part by considering interaction effect of micro-bulges on rough surfaces
  • Method for determining normal contact rigidity of loaded joint part by considering interaction effect of micro-bulges on rough surfaces
  • Method for determining normal contact rigidity of loaded joint part by considering interaction effect of micro-bulges on rough surfaces

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Embodiment

[0163] Taking two different rough surfaces as an example, the microscopic surface topography of the local regions of the two rough surfaces simulated by numerical software is as follows: figure 2 , image 3 shown. The material parameters of contact surface 1 are as follows: Elastic modulus E 1 =130Gpa, Poisson's ratio v 1 =0.3, yield strength σ y1 =300MPa, hardness H 1 =1200MPa; the material parameters of contact surface 2 are as follows: modulus of elasticity E 2 =130Gpa, Poisson's ratio v 2 =0.3, yield strength σ y2 =260MPa, hardness H 2 =740 MPa. The normal load applied to the junction P=1×10 4 Pa.

[0164] Set the number of collection points to 500, and substitute the collected contour height data into the discrete structure function expression to draw the discrete structure function images of the two contact surfaces, and regression analysis in log-log coordinates can obtain the fitting curve The slope and intercept of , and its visualization results are as fo...

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Abstract

The invention provides a method for determining normal contact rigidity of a loaded joint part by considering the interaction effect of micro-bulges on rough surfaces. The method comprises the following steps of: measuring microstructure data of contact surfaces, acquiring micro-profile data of contact surfaces of the joint part by using a three-dimensional profile measuring instrument, extracting the position coordinate of each micro-bulge peal in the length direction, and simulating micro-bulge forms of the rough surfaces; building a relation between a normal load and the contact rigidity; computing fractal parameters of the contact surfaces, theoretically computing the extracted data by using a structure function method, and acquiring fractal dimensions and scale coefficients of the surfaces; and according to the above steps, putting each parameter value of the material to finally compute the normal contact rigidity of the joint part. The new method for determining the normal contact rigidity of the joint surfaces provided by the invention overcomes the defect that the traditional method based on a fractal theory is inaccurate in computation result in the case of heavy load, and has the advantages of strong reliability, being close to actual situation, small computation amount and improved computation efficiency.

Description

technical field [0001] The invention relates to a method for determining the normal contact stiffness of a mechanical joint, in particular to a method for determining the normal contact stiffness of a loaded joint considering the influence of the interaction of asperities on a rough surface. Background technique [0002] The increasing development of industrial technology has put forward higher requirements for the precision and integration of machining equipment, and the further improvement of machining precision cannot be separated from the wide application of mechanical connection technology. As an important part of the overall stiffness of the mechanical structure, the contact stiffness of the mechanical joint has a very significant impact on the dynamic characteristics of large mechanical equipment. Studies by foreign scholars have shown that in ordinary lathes, the deformation of the sliding plate and the tool holder accounts for 40% of the total deformation of the mac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 王润琼朱立达倪陈兵敦艺超史家顺于天彪巩亚东
Owner NORTHEASTERN UNIV
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