| Summary: | 碩士 === 國立高雄應用科技大學 === 精密模具與機械產研碩士外國專班 === 99 === ABSTRACT
Cold forging process can be described as the process where a metal is plastically
deformed at room temperature with application of huge pressure. The process not only
changes the shape but also improves the properties of the forged parts. In cold forging
process, forming load is one of the most important factors. It affects mechanical durability as
well as fatigue life of die. Forming load is expected as low as possible. This study will
investigate the design of cold forging die for hex bolt M8x25. DEFORM 3D software and
Taguchi method was used to optimize forming load by changing some design parameters.
The simulation was carried out with an orthogonal array (L9) based on the Taguchi method.
The results showed that the optimal values of parameters are rake angle in process 2 at level
1 (1o), across flats distance in process 2 at level 1 (12.7 mm), draft angle in process 2 at level
1 (25o) and rake angle in process 3 at level 3 (3o). After optimizing, the optimized parameters
reduced the forming load of top die in process 3 by 26.6% (5.13x104N comparison with
initial value 6.99x104N).
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