tailieunhanh - Mechanical Engineers Data Handbook Episode 9

Tham khảo tài liệu 'mechanical engineers data handbook episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 190 MECHANICAL engineer s data handbook Characteristics of steel tools Carbon steels for softer metals and wood poor performance above 250 C Composition Characteristics Applications Plain carbon steel oMn High toughness low hardness water hardening C Shear blades chisels turning mandrels C General purpose. Best combination of toughness and hardness Large taps and reamers 4 c High hardness keen edge low shock resistance Taps screw dies twist drills mills for soft metals files Carbon steel vanadium C Mn Va Water hardening takes keen edge more shock resistant than plain carbon steel Screw taps and dies twist drills reamers broaches Chrome steel C Mn Cr Water hardening good abrasion resistance takes high compression Drawing dies wood planes chisels High manganese steel C Mn Oil hardening tougher but less hard high shock resistance Bending form dies hammers tool shanks High-speed steels Composition Type c w Cr Va Co Mo Characteristics Super 18 22 10 12 Highest temperature of HSS. Very hard but not so tough. Most expensive. For materials with tensile strength 1225 MPa General purpose 18 Tougher than super and cheaper for materials over 1225 MPa tensile strength General purpose tungsten molybdenum 7 6 Better impact resistance and cheaper than general purpose HSS. High wear resistance High vanadium 5 Best abrasion resistance. Used for highly abrasive materials HSS high-speed steels. MANUFACTURING TECHNOLOGY 191 Carbide and ceramic tools Carbides are graded according to series see table and by a number from 01 hardest to 50 toughest . P01 and K40. Carbides Series Material machined Carbides p Steel steel castings w Ta Tt Ni with Co binder M Cast iron non-feưous plastic w with Co binder K Heat resistant steels stainless steels w with Co binder Sintered carhide tools - cutting conditions and positive rake Cutting speed mmin Top rake .