Research And Application Of Mould Parts Library Retrieval Technology Based On Graphic Similarity And Part Relevance

The use of parts library can effectively reduce product cost,shorten product design and development cycle,and improve product quality.However,the number of parts in the parts library is very large.It is very difficult to search for a certain part or a group of parts that realize a certain function among a large number of parts,and the retrieval technology of parts is relatively high.The existing parts library only supports keyword search and feature search,but due to the low standardization of the enterprise,inaccurate part coding or interpretation,the current search still has certain limitations.These situations are particularly serious in mold companies.At present,China's mold companies generally have problems such as low standardization rate,difficulty in searching collaborative information among mold companies,and difficulty in maintaining complex molds.Therefore,the parts library system,especially the mold parts library system,needs to add a new retrieval function.To this end,this paper studies two types of parts retrieval technology to meet more needs of users.(1)Part retrieval technology based on the similarity of part graphics.Retrieve similar parts mainly by using part sketches and pictures.The first application scenario is: a part designer conceives a part sketch,and then uses this sketch to quickly search for information about similar parts in the part library for application;the second application scenario is: the part purchaser quickly sketches in the part library through the sketch.Retrieve the same or similar parts from different suppliers,analyze the cost performance,and then purchase;(2)Part retrieval technology based on part correlation.Many parts in a part library have an association relationship,thereby forming an assembly.Therefore,designers often want to search for a group of related parts that realize a certain function and form a part,rather than searching for various parts separately,such as bolts,nuts,thrust washers,rubber gaskets,etc.of the same specification.To improve search efficiency.The structure of the full text is as follows:Chapter 1 is the introduction.Firstly,the research background and the problems to be solved in this paper are explained,and the research status of search technology based on similarity of graphics and search technology based on relevance at home and abroad are analyzed.Finally,the main research content,thesis framework and technical route of this paper.Chapter 2 is the optimization of HED algorithm for part similarity retrieval.In order to support part retrieval based on the similarity of part sketches,the edge extraction algorithm-HED algorithm was optimized.The retrieval based on the similarity of the part sketch is to realize the sketch retrieval function of the 3D CAD model of the part retrieval in the part library.The first task of sketch retrieval is to solve the problem that the similarity between the sketch and the view of the 3D CAD model is small.The solution idea proposed in this paper is to use the HED algorithm to extract the border map of the CAD model view,and then compare the similarity between the border map and the sketch.However,the existing HED algorithm has very poor results when extracting the part border map.After analysis and research,this paper improves and optimizes the HED algorithm from three aspects: adding a data set,connecting residuals,and adding a Re LU activation layer.Chapter 3 is the research on similarity retrieval optimization of part sketches based on generative adversarial networks.Using the adversarial network to further optimize the retrieval technology based on the similarity of parts sketches.There is still a certain gap between the part model frame drawing extracted by the optimized HED algorithm and the real sketch.If the similarity comparison is performed directly,the effect is not good.Therefore,this paper proposes to add a production adversarial network(GAN)behind the optimized HED algorithm to form a sketch retrieval system.The border maps extracted by the HED algorithm are further optimized by using a generator that generates an adversarial network,and these border maps are continuously approximated by a discriminator to improve the accuracy of part retrieval.Chapter 4 is the research of part search technology based on part correlation.Because part library users(mainly product designers)often choose some associated parts and components in the design process of using the part library,a large amount of usage behavior data is generated.The association relationship mining algorithm can be used to obtain the association of parts from the history of parts downloaded from the parts library,and then help users search for related parts based on the association of these parts.From the perspectives of minimum support,multiple support,and user ratings,this paper improves the optimized association relationship mining algorithm,FP-Growth.Combine the user data in the general parts library for experimental verification.Chapter 5 is the design and implementation of the mold parts library system.Based on the requirements of the mold industry for the parts library system,the overall design of the system is carried out from the system's technical and structural frameworks,and the main functional modules of the system are shown one by one.The part retrieval technology was verified.Chapter 6 is the conclusion and prospect.While summarizing the research content of this paper,the main work and innovations of this paper are expounded,and finally the work of this paper is prospected.