金型材料の熱伝導率が熱間鍛造特性へ及ぼす影響 [in Japanese] Influence of Thermal Conductivity of Die Material on Hot Forging Characteristics [in Japanese]
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The effects of the thermal conductivity of die materials on hot-forging characteristics were investigated on a servo press. Stellite (Co-28 mass% Cr, thermal conductivity: approximately 15 W·m<sup>-1</sup>·K<sup>-1</sup>) and tungsten carbide (WC-20 mass% Co, thermal conductivity: approximately 70 W·m<sup>-1</sup>·K<sup>-1</sup>) were used as die materials with low and high thermal conductivities, respectively. In upsetting of a chrome steel at 1273 K, the stellite die reduced forging load by approximately 20% at a forging speed of 5 mm·s<sup>-1</sup> because the die with a low thermal conductivity was effective in keeping the specimen at a high temperature during upsetting. Furthermore, the stellite die was effective to fill the specimen into a die cavity part (inlet diameter: φ3 mm, depth: 32 mm) in hot upsetting.
- Journal of the Japan Society for Technology of Plasticity
Journal of the Japan Society for Technology of Plasticity 54(627), 363-367, 2013-04-25
The Japan Society for Technology of Plasticity