No.11（2016）4.Evaluation method of the friction force in deep drawing

Kenta Nakamura，Yusuke Mizugaki

  From the view point of environmental protection and industrial safety-and-health, chlorine-free type lubricants was developed and used for deep drawing. The friction force between tools and blank is an important parameter for developing new lubricants and new lubrication systems. In general, the friction force is determined with the mold used in product line. However, the results from such an evaluation only serve to indicate whether deep drawing using a new lubricants or lubrication systems is possible or not. Therefore, a way to measure the friction force without requiring a new measuring instrument was proposed. The friction force can be determined by making use of a full-lubrication condition. A full-lubrication condition on the die tool surface was made by a polyethylene sheet and a lubricant. Using this measuring method, the friction force between the die tool and the blank can be measured. In addition, it was found that the friction force between die-flange part as well as die-radius part can be determined separately. Moreover, the study also suggested the possibility of evaluating the changes in the friction force due to adhesion using this method.

Keywords
Deep drawing, Friction force, Lubricants, Stainless steel sheets

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