A retrieval method of similar numerical control technics of electronic parts based on characters of a three-dimensional model

A technology of three-dimensional models and electronic parts, applied in structured data retrieval, database models, electrical digital data processing, etc., can solve the problems of heavy repetitive labor for craftsmen and non-reusable process knowledge

Active Publication Date: 2014-08-27
CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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Problems solved by technology

[0010] Aiming at the problem that in the process of numerical control process design of electronic key parts, the amount of repeated labor of the c

Method used

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  • A retrieval method of similar numerical control technics of electronic parts based on characters of a three-dimensional model
  • A retrieval method of similar numerical control technics of electronic parts based on characters of a three-dimensional model
  • A retrieval method of similar numerical control technics of electronic parts based on characters of a three-dimensional model

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[0096] detailed description

[0097] The technical scheme of the present invention will be further specifically described below through examples and in conjunction with the drawings.

[0098] This algorithm is based on Figure 5 The process shown is carried out with simplified image 3 The part model to be process design is shown as an example.

[0099] The first step: preprocessing of the part model

[0100] Set up through CAD development interface image 3 The convex bounding box of the part, and the centroid of the obtained part is (x 0 , Y 0 ,z 0 ). Carry out coordinate transformation on the model, translate the origin of the center of the world coordinate system to the centroid of the current model, and the change matrix is ​​Ts. Define the direction of the surface with the largest area of ​​the enclosing body as its main direction, and obtain the angle between the surface of the world coordinate system and the x, y, and z coordinate axes as (θ 1 , Θ 2 , Θ 3 ), the rotation mat...

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Abstract

The invention relates to a retrieval method of similar numerical control technics of electronic parts based on characters of a three-dimensional model. According to parts technics of actual example model, the technics of actual example already in the database is retrieved based on retrieval algorithm of similar technics level. The retrieved results are displayed to technics designers according to the similarity from high to low order. In similar degree calculation, traditional similarity algorithm, which is relied on the simple sum of individual character similarity between the parts, without considering the relationship between the characters, is abandoned in the invention, and the characteristic triangle is adopted as the basic unit of the similarity calculation, thus more comprehensive similarity Information between parts in topological structure is considered, to improve the accuracy of similarity retrieve; on the other hand, traditional retrieval method of actual example, considering multiple factors in single-layer at same time, is abandoned, and the retrieval method of level by level filter is used, considering few factors in every level, to shorten retrieval time in some extend and improve the retrieval efficiency.

Description

technical field [0001] The invention belongs to the field of numerical control process design of mechanical manufacturing, in particular to the field of numerical control process design of electronic key parts. Background technique [0002] With the development of manufacturing industry and electronic technology, higher requirements are put forward for the processing quality and precision of electronic parts. CNC machining is widely used because of its high processing precision and efficiency. The length of the cycle directly affects the quality and production efficiency of products, so the quality and efficiency of NC process design have received extensive attention and research. [0003] The numerical control process (hereinafter referred to as F) can be regarded as the process information of all structural features in the part (hereinafter referred to as the characteristic process element Foi) combined in a certain order, namely: [0004] F={Fo1, Fo2, Fo3...Fon} [0005...

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Application Information

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IPC IPC(8): G06F17/30
CPCG06F16/245G06F16/285
Inventor 张柳张丹吕荣水徐锋
Owner CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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