Replace the whole heating method with local heating

Replace the whole heating method in 2021 - with local heating 03 - 01 Jin Rongzhi ( Harbin HuiLong car box bridge co. , LTD. ) Through the heat treatment process optimization, achieve the goal of energy saving, is one of the most effective means of modern energy-saving heat treatment. Two cases of technology today. 1. Replace the whole heating method with local heating applications: 60 ti medium frequency quenching replace MNVB 20 steel carburized steel manufacturing cross shaft is one of the important parts, automobile universal joint cross shaft has been using low carbon alloy steel carburizing and quenching process, its service life at about 3 km. To switch to low hardenability steel medium frequency quenching process, not only save material cost and process cost, decrease the cost by 50%, and can improve the service life of the parts. （ 1) 60 ti steel cross shaft intermediate frequency quenching process, the frequency is 2500 hz, for 18 ~ 25 kw power, variable pressure than 12:2, 350 ~ 450 v voltage and electric current of 160 ~ 165 a, heating time 5. 5 min, 20 ℃ water gush cold hardening, water pressure 0. 3 to 0. 4 mpa, tempering the 160 ~ 200 ℃ tempering process. （ 2) The performance of the intermediate frequency quenching after cross shaft and cost as shown in table 1. Table 1 performance and cost of different material and process the spider is 2. Steel in the two-phase region (lower heating temperature method The temperature) Quenching. The temperature quenching process has the advantage of while guarantee the material strength, hardness, plasticity and toughness is improved, and the quenching deformation or cracking tendency decreased significantly, and can significantly reduce energy consumption. Application: bevel gear, the dimensions for & phi; 32. 93mm× 20 mm, inner hole diameter 10 mm, material is 45 steel, requires tempering hardness 220 ~ 250 HBW, tooth of high-frequency quenching hardness 40 ~ 46 HRC. （ 1) The original processing craft route forging stock & rarr; Normalizing & rarr; Coarse car & rarr; Conditioning & rarr; Machining & rarr; High frequency quenching & rarr; Grinding inner hole, the processing procedure is various, energy consumption, high cost. To cancel normalizing, tempering, directly to the temperature quenching, not only guarantee the product quality, and reduce the production cost. （ 2) The temperature quenching process and the effect of 45 steel bevel gear ( 780± 10) 8 ℃ salt bath heating, heat preservation min, water cooling, 320± 10) ℃ heat 1 h after tempering, tooth of 42 to 45 HRC hardness, the magnetic particle inspection check, found no quenching cracks. Source: the metal processing ( Hot working) Magazine,