Gear heat treatment process

A 1, working conditions and material and heat treatment requirements. Condition: low speed and light load and impact requirements: not HT200 HT250 HT300 to stress annealing. 2. Condition: low speed, < 1 m / s) Slip board, light load, such as lathe gear etc. Requirements: 45 quenched and tempered, HB200 - 250 3. Condition: in the low speed, load, such as standard series reducer gear requirements: 45 40 cr 40 MNB ( 5042 mnvb) Quenched and tempered, HB220 - 250 Y 4. Conditions: low speed, overload, no impact, such as machine tool headstock gear requirements: 40 cr ( 42 mnvb) Quenching medium temperature tempering HRC40 - 45. 5. Condition: in the medium speed, load, no violent shocks, such as machine tool headstock gear requirements: 40 cr, 40 MNB, 42 MNVB conditioning or normalizing, induction heating surface quenching and low temperature tempering, aging, HRC50 - 55 (6). Condition: medium speed, medium or low speed, overloading, such as lathe requirements for the secondary gear in the gearbox: 45 high frequency quenching, 350 - 370 ℃ tempering, HRC40 - 45 ( When high frequency equipment, can use rapid heating tooth surface quenching) 7. Condition: medium speed, overloading requirement: 40 cr, 40 MNB ( 40MnVB、42CrMo、40CrMnMo、40CrMnMoVBA) Quenching medium temperature tempering, HRC45 - 50. 8. Conditions: high speed, light load or in high speed, load, a small gear with impact requirements: 15, 20, 20 cr, 20 MNVB carburizing, quenching and low temperature tempering, HRC56 - 62. 38 cral 38 crmoal nitriding, nitriding depth of 0. 5mm,HV900 9. Conditions: high speed, load, no violent shocks, such as spindle wheel. Requirements: 40 cr, 40 MNB, ( 40 mnvb) High frequency quenching, HRC50 - 55. 10. Conditions: high speed, load, shock, appearance is complex and important gear, such as automobile transmission gear ( 20 crmnti high hardenability, small heat sensitivity, carburizing speed, uniform transition layer, directly after carburizing and quenching deformation is small, normalizing after cutting processability, good low temperature impact toughness is better also) Requirement: 20 cr, 20 mn2b, 20 MNVB carburizing, quenching and low temperature tempering or high frequency quenching after carburizing, HRC56 - 62. 18 crmnti 20 crmnti ( Forging to normalizing, gear machining to local with plating, carburizing, precooling quenching and low temperature tempering to grinding, shot peening) 1 carburized layer depth. 2 - 1. 6 mm, gear HRC58 - hardness Hardness of 60, the core HRC25 - 35. Surface: tempered martensite + retained austenite + carbide. Center: sorbite + fine pearlite 11. Conditions: high speed, overload, shock, modulus requirements: cr, 20 mn2b carburizing, quenching and low temperature tempering, HRG56 - 62. 12. Conditions: high speed, overloading, or load, module> 6, require high strength, high wear resistance, such as vertical lathe important requirements of spiral bevel gears: 18 crmnti, 20 simnvb carburizing, quenching and low temperature tempering, HRC56 - 13 62. Conditions: high speed, overload, have important gear impact, complex shape, such as high speed, heavy truck diesel engine, aircraft engine gear on the equipment. Requirements: 12 cr2ni4a, 20 cr2ni4a, 18 cr2ni4wa, 20 crmnmovba ( Forging, annealing to rough machining, the stress - semi-finishing - carburizing to annealing softening and hardening, cold treatment to low temperature tempering, fine grinding) 1 carburized layer depth. 2 - 1. 5mm,HRC59- 62. 14. Big gear conditions: the load is not high, such as large gear planer requirements: 50 mn2, 50, 65 mn quenching, air cooling, 15. Conditions: low speed, load, precision gear. Requirements: 35 cr