Application of surface modification for Extension tool life in blanking process
Pakorn Chumrum, Varunee Premanond 1 and Komgrit Lawanwong 2*
1 Department of Tool and Materials Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand.
2* Department of Production Engineering, Faculty of Industry and Technology, Rajamangala University of Technology Rattanakosin Wang Klai Kangwon Campus, Thailand.

Abstract

The objective of this research is to increase of blanking die life by surface technology of coating and surface treatment. Friction and wear phenomenon were investigated by ball on disk technique by using tribometer. Blanking die experiments were also performed to confirm the performance of coated and treated tool surface for a guide line to select the proper types of thin film coating or surface treatment. Punch and ball were produced from cold work tool steel grade SKD11 (JIS) hardened to 601 HRC. Four types of hard film coating are TiC-CVD (Chemical Vapour Deposition), TiCN-CVD, TiCN-PVD (Physical Vapour Deposition), VC-TD (Thermal Diffusion) and Non-coating. Workpiece and disk material used in this experiment were made by cold rolled steel sheet JIS; SPCC of 2 mm thickness. It has been found experimentally that the selected types of treatment and coating showed ability to reduce wear and friction under both conditions of ball on disk test and blanking test. Die and ball coated with TiCN using CVD process illustrated maximum reduction of wear. This is due to high adhesion strength between the coated film and substrate.

Keywords : Coating, Hard Thin Film Coated, Blanking die, Wear, Cold Rolled Steel