液压机械手设计(多功能机械手含图纸).zip

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编号:1457508    类型:共享资源    大小:3.54MB    格式:ZIP    上传时间:2023-03-16
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J. Cent. South Univ. (2012) 19: 174178 DOI: 10.1007/s1177101209883 Multi-stage optimum design of magazine type automatic tool changer arm KIM Jae-Hyun, LEE Choon-Man School of Mechatronics, Changwon National University, Changwon 641-773, Korea Central South University Press and Springer-Verlag Berlin Heidelberg 2012 Abstract: To enhance machining efficiency, tool change time has to be reduced. Thus, for an automatic tool changer attached to a machining center, the tool change time is to be reduced. Also the automatic tool changer is a main part of the machining center as a driving source. The static attributes of the automatic tool changer using the commercial code, ANSYS Workbench V12, were tried to interpret. And the optimum design of automatic tool changer arm was proposed by performing the multi-stage optimum design. The shape optimization of the automatic tool changer was proposed and the result was verified to obtain acceptable improvements. It is possible to obtain an optimized model in which the maximum deformation, maximum stress, and mass are reduced by 10.46%, 12.89% and 9.26%, respectively, compared with those of the initial model. Also, the results between conventional method by the design of experiments and proposed method by the multi-stage optimum design method were compared. Key words: automatic tool changer; optimum design; structural analysis; exchange arm 1 Introduction Recently, in machine manufacturing industries, molds and machine parts have been changed to small quantity batch production system. Also, improvements in productivity and cutting rate are required. Whereas, it is true that high quality and low cost are to be targeted from a practical standpoint. Therefore, the machine tools for such aims pursue to achieve high-speed processing, implement automation, and reduced lead time. As a result, it is possible to check the states of tools and workpieces using proper sensors in the machine tools. In addition, a machining center based on an automatic tool changer (ATC) and an automatic pallet changer (APC) aims to operate an unattended operation factory for 24 h. The automatic tool changer stores the tools used in a machining center to its magazine and changes the tools automatically as required. The tool changed by such ATC is precisely equipped to a spindle 1. Also, it represents an advantage that an operator of the machining center is able to engage in other works due to the less interference for the machine tools. That is to say, the operator can control other machine tools or prepare the next workpieces, which leads to reduced production time. The magazine type ATC used in this study represents a feature that many tools are stored in the magazine. In the change of tools, two arms move to change the equipped tool to the next tool by rotating them by 180 in a directly changed manner 2. Thus, it is necessary to ensure the technologies for both the structural characteristics of arms and the design of lightweight simultaneously. In actual industrial fields, design optimization is very important. Therefore, various optimization methods are presented for the optimization of various mechanical parts 3. SONG et al 4 presented optimization design of the short journal bearing by using enhanced artificial life optimization algorithm. ALLAIRE et al 5 combined the topological and shape derivations on the structural optimization. BAGCI and AYKUT 6 presented Taguchi optimization to verify the optimum surface roughness of the CNC milling. LAMBERTI 7 presented a design optimization algorithm based on simulated annealing for truss structures. SEKULSKI 8 presented that the genetic algorithm can be an efficient multi-objective optimization tool for simultaneous design of the topology and sizing of ship structures. SEO et al 9 presented shape optimization and its extension to topological design based on isogeometric analysis. In optimizing the ATC arm, the factors of the structural characteristics and the lightweight are contrary to each other 10. It shows a trade-off that if it pursues to improve the lightweight in structures, the structural characteristics will represent a weakness, and if the Foundation item: Work(RTI04-01-03) supported by Grant from Regional Technology Innovation Program of the Ministry of Knowledge Economy (MKE), Korea Received date: 20110426; Accepted date: 20111010 Corresponding author: LEE Choon-Man, Professor, PhD; Tel: +82552133622; E-mail: cmleechangwon.ac.kr J. Cent. South Univ. (2012) 19: 174178 175 structural characteristics are improved, the achievement of the lightweight is difficult. Therefore, for satisfying these contrary factors and optimizing them, the optimization of such arm shapes in different way is presented by using the design of experiments 11. In this study, for achieving a more improved optimization model than the previous study 11, a multi-stage optimum design was performed. The optimum design was presented using the commercial analysis programs, CATIA
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