| Summary: | 碩士 === 國立虎尾科技大學 === 機械與電腦輔助工程系碩士班在職專班 === 106 === Taiwan fastener manufacturers are famous internationally. Behind the superior technology is the vendor’s long-term accumulation of experiences. Currently, process technology and mold design among vendors on the manufacturing of fastener still mostly rely on traditional practical experience and repeated trial and error method, which leads to high costs in the development of test mold, as well as taking much time. In response to the advancement in the fastener industry, to allow Taiwanese fastener industry to maintain an advantage around the world, CAE computer-aided software is applied on simulation analysis to conduct research, observe and discuss, thereby facilitating industrial technology, allowing the improvement in quality.
This study aimed at improving the defects of cold forging for pan-head 6-Lobe Recess, in which, 3D graphics software was used to construct molds throughout phases and finite element analysis software was used for the analysis on the design thereof, identifying the root causes of defects, then having the head shape with repeat planning Phase II in the pre-forming process, constructing new mold at Phase II and analyzing the molding process by finite element analysis software to evaluate feasibility, finally molding it to validate the physical forging result.
Indicated from the results of simulation analysis, the status of equivalent strain distribution and the direction/speed that blanks flow affect the occurrence of crack caused during screws forging head; upon improved design of pre-formed head shape at Phase II, the state of equivalent strain distribution of forged head of screw at Phase III and the direction/speed that blanks flow was improved successfully, which avoided the formation of the forging cracks.
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