The Deformation Control Of Carburized Gear Heat Treatment

Publish Time: 06/22 2021 Author: Site Editor Visit: 15336

Heat treatment deformation of carburized gear. Heat treatment deformation directly affects the accuracy, strength, noise and life of the gear. Even if the gear grinding process is added after the carburizing heat treatment, the deformation still reduces the accuracy level of the gear.

There are many factors that affect the deformation of carburizing heat treatment, and only by controlling various factors can the deformation be controlled to a small extent. Controlling the deformation of gears must also be solved in the whole process of manufacturing gears.

The test of the influence of metallurgical factors of gear material on deformation shows that the higher the hardenability of steel. The greater the deformation. When the core hardness is higher than 40HRC, the deformation will increase significantly. Therefore, there are certain requirements for the hardenability of steel, the narrower the hardenability band. The more stable the deformation, the steel mill is required to provide "low and stable deformation" steel. The A1/N content ratio is controlled within the range of 1 to 2.5, which can narrow the hardenability band and reduce deformation. In addition, the box segregation and band structure of the material affect the uneven deformation and uneven carburization of the gear spline hole.
The effect of preliminary heat treatment on gear deformation. Excessive normalizing hardness, mixed crystals, a large amount of sorbite or Widmanstat will increase the deformation of the inner hole, so temperature control normalizing or isothermal annealing should be used to treat forgings.
The effect of carburizing process on deformation The uniformity of temperature. The uniformity of the carbon layer and the uniformity of the cooling medium temperature all affect the deformation of the gear. At the same time, the higher the carburizing temperature, the thicker the carburizing layer. Low oil temperature and large gear deformation. Therefore, it is necessary to improve the equipment, optimize the process, and improve the quality of gear heat treatment.
The effect of quenching on deformation. Quenching cooling behavior is the most important factor affecting gear deformation. Hot oil quenching has less deformation than cold oil quenching, and is generally controlled at 100℃±120℃. The cooling capacity of the oil is also critical to deformation. Stirring method and intensity affect the deformation, the disk gears quenched by the upper quenching press, according to the deformation of various gears. Adjust the parameters of the flushing press to reduce the deformation, adjust the pressure of the inner and outer die and the expansion block, the size of each section of the fuel injection, and the upper work table to control the deformation.
The clamping method and the purpose of the fixture are to make the workpiece evenly heated and cooled, and the carburized layer of each part of the workpiece is uniform to reduce the uneven thermal stress and the uneven structural stress to reduce deformation. The clamping method can be changed. The oil level is vertical, the shaft parts are installed vertically, using compensation washers, supporting washers, superimposed washers, etc., spline hole parts can be carburized mandrels, etc.
Coordination in mechanical processing: first. Grasp the heat treatment deformation law, move the tolerance zone position, and improve the product qualification rate; second, according to the deformation law, apply anti-deformation, and shrink the end pre-expansion hole to improve the deformation qualification rate after quenching; third, for asymmetric or uneven thickness parts Using the method of reserved processing volume. Process after heat treatment. Fourth, after heat treatment, use a push knife to finish the spline hole, or electrolytically process the spline hole, or heat the mandrel after carburization for quenching, and then press out the mandrel to ensure the size of the spline hole to reduce deformation.

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