Share gear surface hardening technology document

by:Hengyang Furnace     2020-09-26
Gear surface hardening methods a flame hardening, induction hardening and the contact resistance heating quenching and so on, in addition to advanced laser quenching and so on. Surface hardening layer are obtained by surface quenching, the heart of the gear can still maintain the original microstructure and performance of the same, so as to improve the toughness of fatigue strength and wear resistance and keep the core of excellent comprehensive performance. And can save energy, reduce the gear quenching distortion. 1. The classification of surface hardening are shown in table 1. Table 1 surface quenching the classification of the classification process coarse segmentation of heating of heating method -- Induction quenching, flame quenching, quenching salt bath heating, electrolyte quenching, quenching, laser hardening, contact resistance beam hardening, ion beam hardening, high frequency induction quenching of pulse current with lower energy density, such as, solar heating quenching heating induction hardening, the energy density of flame quenching, salt bath quenching, quenching electrolyte such as high energy density laser quenching heating, electron beam hardening, ion beam quenching, quenching, contact resistance within energy sources such as solar heating quenching heat source heating induction hardening, pulse current induction hardening heat source heating flame quenching, quenching salt bath heating, electrolyte quenching, quenching, laser hardening, contact resistance beam hardening, ion beam hardening, solar heating, quenching, etc. 2. General technical requirements of surface hardening gear 1) Technical requirements of surface hardening gear are shown in table 2. Table 2 technical requirements of surface hardening gear project big pinion gears shows that the depth of hardening layer/mm ( 0. 2 to 0. 4) M (1) the effective hardening layer depth, according to the standard of GB/T 5617 - 2005 regulations, tooth surface hardness HRC 45 ~ 50 or 300 50 to 55 ~ 400 hw if the ratio is 1:1, the size of the gear tooth surface hardness can be equal to the surface structure of fine acicular martensite tooth part hardness of ferrite is not permitted in the core HBW conditioning: carbon steel alloy steel 265 ~ 280, 270 ~ 300 for some requirements is not high gear normalizing can be used as a preparation for the module of gear heat treatment (1) m ( mm) 。 2) Gear surface quench hardened layer distribution form, a strengthening effect and application scope and method of tooth root no hardening process: rotary heating quenching method. Strengthening effect: tooth surface wear resistance increase; Bend fatigue strength has little influence, the allowable bending stress is lower than the level after quenched and tempered steel. High frequency ( Including super audio) Quenching medium frequency ( 2. 5 khz, 8 khz) Quenching flame quenching induction treatment gear diameter is determined by the power equipment; The gear width 10 ~ 100 mm; M 5 mm or less processing gear diameter is determined by the power equipment, gear width 35 ~ 150 mm; The individual is up to 400 mm; M 10 mm or less gear diameter is 450 mm; Special quenching machine tool; M 6 mm or less, individual circumstances to m 12 mm or less note: m - The module of gear ( mm) 。 B, tooth root hardening process method: rotary heating quenching method. Strengthening effect: tooth surface wear resistance and tooth root bending fatigue strength are improved; Allowable bending stress by 30% ~ 50% higher than that of quenched and tempered condition; Can part instead of carburized gears. High frequency ( Including super audio) Quenching medium frequency ( 2. 5 khz, 8 khz) Quenching flame quenching induction treatment gear diameter is determined by the power equipment; Tooth 10 ~ 100 mm wide; M 5 mm or less processing gear diameter is determined by the power equipment, gear width 35 ~ 150 mm, the individual is up to 400 mm; M 10 mm or less gear diameter is 450 mm; M 6 mm or less, individual circumstances to m 10 mm or less c, tooth root hardening process methods: single tooth continuous heating quenching method. Strengthening effect: tooth surface wear resistance increase; Bending fatigue strength is influenced by a certain ( Generally end in from the root of the induration layer 2 ~ 3 mm) ; Allowable bending stress is lower than the level after quenched and tempered steel. High frequency ( Including super audio) Quenching medium frequency ( 2. 5 khz, 8 khz) Quenching flame hardening gear diameter is not restricted, m p 5 mm diameter of gear is not restricted, m 8 mm diameter of gear is not restricted, or m or 6 mm d, tooth root hardening process method: along the tooth groove continuous heating quenching method. Strengthening effect: tooth surface wear resistance and tooth root bending fatigue strength increase; Allowable bending stress by 30% ~ 50% higher than that of quenched and tempered condition; Can part instead of carburized gears. High frequency ( Including super audio) Quenching medium frequency ( 2. 5 khz, 8 khz) Quenching flame hardening gear diameter is not restricted, m p 5 mm diameter of gear is not restricted, m 8 mm diameter of gear is not restricted, or m 10 mm 3 or higher) Typical of surface hardening gear machining process: blank, forging stock normalizing ( Or annealing) - machinery rough machining to conditioning, semi-finishing ( Blocking) Tooth to surface quenching and low temperature tempering, and mechanical finishing to finished product.
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