US 7,320,716 B2
Method for toughening surface of sintered material cutting tool and sintered material cutting tool having long life
Hiroyasu Saka, Aichi (Japan); Won-Jin Mooni, Daejeon (Japan); Shouji Uchimura, Aichi (Japan); and Toshiro Ito, Aichi (Japan)
Assigned to Japan Science and Technology Agency, (Japan); National University Corporation Nagoya University, (Japan); and Sintokogio Ltd., (Japan)
Appl. No. 10/553,849
PCT Filed May 18, 2004, PCT No. PCT/JP2004/007042
§ 371(c)(1), (2), (4) Date Oct. 20, 2005,
PCT Pub. No. WO2004/103615, PCT Pub. Date Dec. 02, 2004.
Claims priority of application No. 2003-147171 (JP), filed on May 26, 2003.
Prior Publication US 2006/0213127 A1, Sep. 28, 2006
Int. Cl. B24D 3/02 (2006.01); C09C 1/68 (2006.01); C09K 3/14 (2006.01)
U.S. Cl. 51—307 7 Claims
OG exemplary drawing
 
1. A method for surface toughening of a ceramics sintered material cutting tool comprising, plastic working said ceramics sintered material cutting tool with an abrasive composed of fine particles, said fine particles having a convexly curved surface and an average particle size of 0.1 μm to 200 μm and a Vickers hardness (HV) ranging from 500 to a value which is the hardness of said sintered material cutting tool plus 50, whereby a uniformly distributed linear dislocation structure is formed in subsurface regions of the ceramics sintered material cutting tool, said plastic working being carried out by shot blasting said sintered material cutting tool with said abrasive particles at a pressure of 0.1 to 0.5 MPa, a shot blasting speed of 20 m/sec to 250 m/sec, a shot blasting amount of 50 g/m to 800 g/m and a shot blasting time of 0.1 sec/cm2 or more to 60 sec/cm2 or less.