| Summary: | 碩士 === 國立中興大學 === 機械工程學系 === 92 === After certain service period of a forging die, there are some failures such as wear or crack appearing on the die. To reduce the cost, a weld-repaired technology is often used just to modify the forging die. However, to regenerate the die, it is still time consumed by using the traditional process with electrical discharge machining technology, so that it is proposed in this paper to apply high speed cutting technology directly on the weld-repaired forging die with the aim to cost down. In this study, a SKH 9 material, which is similar to the one used in weld-repaired forging die, finds limit cutting parameter compromise recommend value, is roughly machined using a feed rate of 0.16mm, a speed of 14000 rpm and a depth of cut of 0.17mm for rough cutting. To optimize the parameters for finishing, the Tuguchi Method is applied in this paper. According to the S/N responses, it is suggested to finish the SKH 9 using a feed rate of 0.08mm, a speed of 8000 rpm, a depth of cut of 0.09mm, a pitch of 0.06mm and a quantity of fluid of 18ml/hr for TiAlN ball end mills of F grade, or using a feed rate of 0.04mm, a speed of 8000 rpm, a depth of cut of 0.09mm, a pitch of 0.06mm and dry cutting for TiAlN ball end mills of X grade. These parameters are used really to cut the weld-repaired forging die. The machining time needed for the proposed method is just 32% for a traditional electrical discharge machining. The results induced from this study will be served as a reference to apply the hard cutting technology on the weld-repaired forging die.
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