Application of surface modification for Extension tool life
in blanking process
Type Of :
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 601 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.