An Assembly-Oriented Performance Evaluation Method for Planar Assembly Based on Minimum Potential Energy
A technology of plane assembly and assembly plane, which is applied in the direction of measuring devices, mechanical measuring devices, and mechanical devices, etc., can solve the problems that cannot reflect the influence of assembly performance due to geometric errors of the assembly surface, have many evaluation parameters, and are not applicable, and achieve the goal of overcoming the evaluation The effect of complex parameters, improving assembly accuracy, and optimizing assembly process
Active Publication Date: 2022-06-24
QINGDAO UNIV OF SCI & TECH
View PDF9 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, domestic and foreign measurement fields are based on the principle of minimum inclusion to conduct evaluation research, mainly including the least square method and the minimum area method, such as the flatness of the plane, but it cannot reflect the influence of the non-uniform distribution of geometric errors on the assembly surface on the assembly performance
Beijing Institute of Technology proposed an assembly-oriented method for determining the evaluation parameters of rectangular plane shape errors, which takes into account the non-uniform distribution characteristics of actual geometric errors, but there are many evaluation parameters, and the process of simulating assembly to find contact points is complicated and not suitable for cylindrical assembly. The assembly performance of the assembly surface cannot be evaluated intuitively and effectively
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments.
[0027] 1. Data processing process:
[0028] Use a three-coordinate measuring machine to measure the assembly plane of the part, and obtain the measurement data of the assembly plane in the measurement coordinate system, denoted as S1(x 1i , y 1i ,z 1i ), where i is a positive integer, and the measurement coordinate system is recorded as LCS. Taking the plane center of the nominal size of the part as the origin, and taking the vertical direction as the Z axis to establish the assembly coordinate system, which is denoted as ACS, thus obtain the three-dimensional space transformation matrix M=M of the assembly coordinate system ACS and the measurement coordinate system LCS x ×M y ×M z , where M x , M y , M z are the rotation and translation matrices of the measurement coo...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to an assembly-oriented method for evaluating plane assembly performance based on minimum potential energy, which belongs to the field of manufacturing quality prediction and control. First, the assembly surface of the part is measured; the ideal surface is matched with the assembly surface, and according to the condition that the total potential energy of the ideal surface and the assembly surface is the smallest and no interference occurs, the change matrix when the ideal plane and the assembly surface reach a stable contact is calculated, and The ideal plane equation at this time is obtained; the intercept between the ideal plane of stable contact and the three coordinate axes of the assembly coordinate system is used as the assembly performance evaluation parameter of the assembly surface, and the influence of the geometric error of the assembly surface on the assembly performance is quantitatively described. This application document comprehensively considers the influence of part design tolerances and geometric errors generated in actual processing on the assembly performance of mechanical products, and quickly and accurately analyzes the assembly performance, processing quality and assemblability of planes under real contact conditions, providing a basis for assembly precision control. and assembly process optimization to provide guidance.
Description
technical field [0001] The invention relates to an assembly-oriented plane assembly performance evaluation method based on minimum potential energy, belonging to the field of manufacturing quality prediction and control Background technique [0002] In the machining process, due to the comprehensive influence of the machining accuracy of the machine tool, tool wear, force deformation of the machining system, thermal deformation and other factors, a certain degree of geometric error will occur. Geometric error refers to the degree of deviation between the actual geometric parameters of the part after machining and the ideal geometric parameters, including dimensional error, position error and shape error. The geometric error makes the actual surface of the part impossible to be an ideal plane, but is composed of convex hulls and valleys of different sizes and shapes that are unevenly distributed on the surface of the part, with uneven geometric shapes. In the assembly proces...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityPatents(China)
IPC IPC(8): G01B5/00
CPCG01B5/008
Inventor张秋爽金鑫尚可杨化林王廷利李红宾
OwnerQINGDAO UNIV OF SCI & TECH