Since TD method(Toyota Diffusion or Thermal Diffusion)was invented by Toyota Central Graduate School of Japanese in the late 1960s ,this process has been widely used on a variety of parts and moulds for it s outstanding effect on surface strengthening.
TD法自1968年由日本丰田中央研究所发明以来,在机械零件及模具处理方面得到了广泛应用,是一种效果很好的表面强化方法;尤其在冷作模具方面,效果极为显著,应用得当可以大幅度提高冷作模具的使用寿命。