Punching part sample researching method

Abstract

A stamping part instance retrieval method, in order to make full use of the successful experience of the stamping process, from the perspective of process similarity, the nearest neighbor method is used to retrieve the stamping part instance. Specifically, first extract features and constraints between features from the 3D model of the stamping part, and obtain the material thickness, strength and hardness of the material according to the stamping part material information table; then calculate the similarity between the old and new stamping parts from the perspective of process similarity ; The calculation of the similarity of the old and new stamping instances is carried out in two stages: the first stage calculates the similarity of the topological relationship of the stampings based on the plane, filters out dissimilar old instances, and obtains similar old instances to narrow down The retrieval space of the subsequent stage; the second stage obtains a most similar old instance from a batch of old instances obtained in the first stage by comparing the comprehensive similarity of features, constraints and materials between the old and new instances. This method has the advantages of easy implementation, less resource consumption, high computational efficiency, and more accurate and reasonable.

Description

technical field [0001] The invention belongs to the field of machining, and relates to information retrieval and stamping methods, in particular to a method for retrieving similar stamping parts so as to better imitate the stamping process of the retrieved stamping parts to carry out process design of new parts. Background technique [0002] Stamping process design is characterized by weak theory and strong experience, and it is generally suitable to use Case Based Reasoning (CBR) to design process schemes. CBR uses existing similar examples to solve problems, so how to retrieve similar examples becomes one of the key technologies for applying CBR. Aiming at the problem of instance retrieval, a variety of methods have been proposed at home and abroad, mainly including: nearest neighbor method, induction method and knowledge-based method. However, there are not many literatures successfully applied to stamping instance retrieval. Similar stampings have similar stamping proc...

AI Technical Summary

Problems solved by technology

[0007] Although method 1 can realize the retrieval of similar instances of blanking parts, each attribute uses 1 and 0 to indicate whether it matches or does not match, which is too rough and simple

Although methods 2 and 3 can be applied to the retrieval of stamping parts, they only consider the similarity in shape and do not consider other information related to the process. They may not be able to refer to the process plan of the retrieved stamping parts, because the shape is the most similar, and the process is not necessarily the best. resemblance

For example, different materials may lead to stamping parts of the same three-dimensional solid model, and the process is very different

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