uaipd 09-0027
TRANSCRIPT
09-0027 “Low stressed functional diamond
film”Inventor: Dr. Kevin Chou
• Drills are critical to productivity and part quality in the manufacturing process.–Most widely used are cobalt-cemented
tungsten (Co-WC) carbide twist drills• Diamond coatings are used to extend tool
life due to high hardness and low friction. – BUT these coatings suffer from adhesion
problems, residual stresses, and have a thickness threshold.
Current Problems
• Method of drill design that lowers the stress of diamond coating on twist drill.– Achieved by perfecting
the geometry of drill design on both the macro and micro level.
• Decreases delamination of coating by reducing the amount of stress.
Technology
• Easy fabrication that utilizes geometry modification to reduce stress.
• Proven advantages through rigorous engineering analysis
Advantages
Drill life,# of holes Comment40 Drill breakage
>100No drill breakage, testing stop for drill evaluation
Engineered edge
Original edge
• Dr. Kevin Chou– Professor– 27 Publications
• Departments– Center for Advanced Vehicle Technologies–Mechanical Engineering
Inventor
