TSH induction hardening process for sprocket gears

TSH technology is an advanced induction hardening process designed to reduce overall cost and replace chemical heat treatment processes.

traditionalSprocketGear heat treatment involves prolonged gas carburizing in batch or continuous furnaces followed by oil quenching.Typically, gears are tempered in a low temperature furnace for one hour.After carburizing, the carbon content in the gear surface area is generally in the range of 0.7-1.0% C, and the hardness is in the range of 58-63HRC.Post-processing includes grinding and shot peening to improve fatigue strength.

Over the years, gear manufacturers have learned about the use of lean and environmentally friendly hardening techniques, such as induction hardening, to improve the quality of heat-treated parts. Induction hardening can be easily automated and integrated into manufacturing cells, allowing for the reproducibility of individual gears. retrospective.The performance characteristics of gears, including loading conditions and operating environment, determine the desired surface hardness, core hardness, hardness distribution/pattern, residual stress distribution, steel grade and its previous microstructure [1-3].

Ring inductors (rotation hardening) are usually suitable for induction hardening of medium and small gears.The main purpose of induction hardening of gears is to obtain a fine-grained martensite layer in specific areas of the part, while the rest are not affected by the induction hardening process.Its hardness, wear resistance, contact fatigue strength, and impact strength are all increased accordingly, increasing the load-carrying capacity to control greater speeds and torques.

Another purpose of induction hardening of gears is to create considerable compressive residual stresses in the surface and in the depth of the hardened layer.Compressive stress helps inhibit crack propagation and resist tensile bending fatigue.Internal and external spur gears, worm gears, racks, shafts and sprockets are all conventional parts that can be induction hardened.

It is generally accepted that not all gears and pinions are suitable for induction hardening.Previously, hypoid and bevel gears, automotive spiral bevel gears, commercial pinions, and non-circular gears were rarely induction hardened due to their complex geometries and, therefore, were usually carburized.Recent developments have changed that.