Abstract
As a general 3D model data format, triangular mesh model has been widely used in mechanical engineering to realize the function of transmitting data between different CAD software, but during the transmission, a large amount of geometric and topological data from mechanical parts has been lost. In order to solve this problem while using triangular mesh model in On-Machine Inspection (OMI), in this paper, a surface division method of parts mesh model for OMI is proposed, intending to solve the problem about mesh model that divided into triangular pieces cannot be operated during OMI. The proposed method contains two processes: boundary line extraction and mesh model division. During the process of extracting boundary line of model surface, a method of extracting coordinate points on the model boundary is proposed by analyzing the Gauss curvature between triangular surfaces, and then using the maximum entropy threshold theory to analyze the correlation between coordinate points to screen out the qualified model boundary line. In the process of mesh model division, based on the extracted model boundary, a mesh segmentation method based on region - growing algorithm is studied to obtain the triangular mesh within the boundary. At last, the validity of the descripted method is verified by some example.
Highlights
The rapid development of manufacturing industry makes the position of precision measurement technology in the field of mechanical manufacturing increasingly prominent, and makes the machine inspection as a new high-efficiency detection method gradually widely used [1], On-Machine Inspection (OMI) system can carry out quality inspection with high-efficiency of mechanical parts without moving parts
With the increasing variety of parts in some mechanical fields, the geometric expression of parts is becoming more complicated, data transmission and sharing are becoming more difficult. To solve this problem digital geometry processing technology based on triangular mesh model has gradually become a research hotspot in the field of computer aided design and manufacturing in recent years [2], in which triangular mesh segmentation is the basis of mesh model processing in OMI process [3], [4]
In view of the above analysis, in order to realize the processing of part mesh model during OMI, this paper presents a surface division method of parts mesh model for OMI
Summary
The rapid development of manufacturing industry makes the position of precision measurement technology in the field of mechanical manufacturing increasingly prominent, and makes the machine inspection as a new high-efficiency detection method gradually widely used [1], On-Machine Inspection (OMI) system can carry out quality inspection with high-efficiency of mechanical parts without moving parts. The main contributions of this paper are as follows: (1) We combined three methods to realize the fast automatic partition of geometric surface on the triangular mesh model of mechanical parts, they are the calculation method of Gaussian curvature, the model boundary line extraction method based on maximum between-cluster variance and the region growth algorithm for triangular plane in boundary. (5) Based on the principle of the region growth algorithm and the boundary line extracted from the triangular mesh model, we extract and classify the triangular surface slices within the boundary line partition range, and reconstruct the geometric topology structure of triangular mesh model surface This method accurately and completely divides the disordered triangular surface in the model, provides convenience for the subsequent analysis operation on the part model, realizes the operability of the part triangular mesh model and provides support for the OMI of mechanical products
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