被覆超硬合金のじん性向上に関する研究

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  • Study of Coated Carbide Tool with Improved Toughness
  • ヒフク チョウコウ ゴウキン ノ ジンセイ コウジョウ ニカンスルケンキュウ

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Coated carbide tool is now located in an important position in turning operation. Some tool fracture troubles, however, sometimes occur especially in rough or interrupted cutting, so more reliability to coated carbide tool is required. Many papers on wear of coated carbide tool are published, however, study on toughness of coated carbide tool is little. This study is intended to gain ideas concerning about coated layer and carbide substrate in order to develop tougher coated carbide tools. Conclusions are as follows : (1) WC-Coalloy (K grade carbide) with 20-30 μm thickness on WC-TiC-Co alloy (P grade carbide) substrate is very effective for improving toughness of coated carbide. (2) Wear resistance of hard materials used as coated layer, such as TiC, TiCN and Al203 much depends upon cutting speed. Wear resistance of TiC or TiCN is better than that of Al2O3 in lower cutting speed than 300 m/min. Al2O3 has excellent wear resistance in higher cutting speed than 300 m/min. (3) Thermal crack resistance of coated layers is affected by thermal diffusivity of them. TiCN with higher thermal diffusibility has better thermal crack resistance.

収録刊行物

  • 精密機械

    精密機械 47 (10), 1229-1233, 1981

    公益社団法人 精密工学会

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