| Summary: | 碩士 === 國立高雄第一科技大學 === 機械與自動化工程所 === 92 === The receiver is one of the important parts in a rifle, in which the bolt carrier assembly moves. This part is also the adaptor for connecting the barrel. If the quality of the receiver is not well, the movement of the bolt carrier assembly will be affected and the failing of shooting will be resulted in, even the bolt carrier assembly stick. In this situation, the explosion will occur and the safety of operators will be threatened. This receiver is forged by using 7075 aluminum alloy as the material. Therefore, its quality will be assured through precision forging process by the well design in the precision forging die and the strict control in the process variables. Then, the quality and the safety of a rifle will be assured during the further machining due to the reducing in the machining amount and the maintaining in dimension accuracy. In this project, the CAE simulation technology combining with precision die design technology and aluminum precision forging process technology is used to develop the precision receiver forgings in a rifle and the relative process information is expected to be built up. First of all, the CAD model of the receiver is built up and then the simulation during forging proceeds by using DEFORM software. The effects of forging die design variables on the result after forging are investigated. According to the optimum condition within the results of simulation, forging dies are designed and manufactured. Afterward, the dies are tested to develop the precision receiver forgings. The conditions for mass production are assured and are provided to the military as reference. Finally, the self-made mass production technology for the military article is expected to be established.
The results show as follows：
(1)It can reduce the cost of manufacturing die，shrinkage the time of testing and lower the possibility for the failure of die to simulate the design of die first by CAE technology and then to proceed the manufacturing of die according to the optimum results. This procedure show available in developing the forging die.
(2)It can dramatic reduce the cost of cutting tools and the lead time for making the forging die by using high speed machining technology.
(3)The surface qualities of the forging materials have much effect on the surface qualities of the forging parts. So, it is very important for the materials with no defects on its surface during forging.
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