A Method for Constructing Part Family of Reconfigurable Manufacturing System
A technology of manufacturing system and construction method, applied in the field of manufacturing, can solve the problems of redundant algorithms, not considering the machining sequence of machine tools, low efficiency, etc., to reduce the interference of accidental factors, improve the utilization rate of machine tools, and improve the accuracy.
Active Publication Date: 2018-06-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
[0006] (1) It only analyzes the processing function of the process route, without considering the processing sequence of the machine tool
[0007] (2) Idle machine tools generated after merging process routes and some idle machine tools that need to be bypassed are not considered
[0008] (3) Some studies use the dissimilarity of process routes to construct part families, that is, to indirectly analyze the relationship between process routes from the opposite direction of process route similarity, and there are unpredictable errors
[0009] (4) There are defects in the existing algorithm: the algorithm is too lengthy, inconvenient to understand, inefficient, and uncertain
Method used
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[0068] A calculation example is used to illustrate the specific calculation process.
[0069] enter:
[0070] Functional sequence: A={1 4 8 9}B={1 4 7 9}C={6}
[0071] calculate:
[0072] ①Since there are no common elements between sequence A and sequence C, sequence B and sequence C, their longest common subsequence length is 0, namely NOLCS AC =NOLCS BC =0, S can be obtained according to formula (7) AC = S BC =0.
[0073]
[0074] In summary, according to the similarity coefficient algorithm of the present invention, the similarity coefficient S between the workpiece A, the workpiece B and the workpiece C is obtained AB =0.6, S AC= S BC =0.
[0075] According to the hierarchical clustering algorithm, since the similarity coefficient of the process route A / B is 0.6, which is the maximum value in the similarity coefficient matrix, the process route A / B is merged, that is, the parts A / B are divided into the same part family , represented by (A,B), delete the row an...
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The invention provides a reconfigurable manufacturing system part family construction method. The reconfigurable manufacturing system part family construction method comprises the following steps that: 101 step, process routes of ungrouped parts are obtained according to orders, so that a processing function sequence Pi / Pj can be obtained; 102 step, a longest common subsequence LCSij is obtained according to the Pi / Pj; 103 step, a shortest composite supersequnce SCSij is constructed with the LCSij adopted as a center; 104 step, the total number of generated idle machines NOIMij and the total number of bypassing actions NOBPMij are calculated according to idle machines which are generated when the SCSij is utilized to process parts of the orders and the situations of bypassing actions; 105 step, the similarity coefficient Sij of two process routes is solved according to analysis results obtained in the 104 step; and 106 step, a final part family AStv is constructed through adopting a hierarchical clustering algorithm. With the reconfigurable manufacturing system part family construction method of the invention adopted, the machine tool utilization rate, productivity and cost efficiency of a reconstructed manufacturing unit can be improved.
Description
technical field [0001] The invention relates to the field of manufacturing technology, in particular to a method for constructing a part family of a reconfigurable manufacturing system. Background technique [0002] With the development of the economy, the competition in the manufacturing industry has intensified, and the needs of customers have become more sophisticated and diversified, resulting in the continuous increase of product types and large fluctuations in market demand. The defects of the manufacturing system are gradually revealed, and the research on new manufacturing systems has gradually become a hot spot, pursuing the pursuit of producing high-quality products at low cost to gain a competitive advantage. The reconfigurable manufacturing system (Reconfigurable Manufacturing System, RMS) can provide precise functions and capabilities according to customer requirements, and has gradually become a research hotspot. [0003] The Reconfigurable Manufacturing Syste...
Claims
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IPC IPC(8): G05B19/18
CPCG05B19/41865G05B19/41885
Inventor王国新黄思翰阎艳杜景军
OwnerBEIJING INSTITUTE OF TECHNOLOGYGY