What are the disadvantages of flame surface quenching of Dalian forgings?

What are the disadvantages of flame surface quenching of Dalian forgings?

The method of spraying the high-temperature flame generated by the mixing of combustible gas and oxygen onto the surface of the forging to quickly heat it to the quenching temperature, and then spraying a certain quenching medium on the heating surface for quenching and cooling is called flame surface quenching method.

Compared with induction heating surface quenching method, flame quenching has the advantages of low equipment investment and easy operation; The method is flexible, unrestricted to the irregular shape and volume of forgings and heating surfaces, and has strong adaptability. It is more convenient and flexible for single piece small batch production.

Especially for the local surface heating of large forging, it is difficult to design and manufacture by using induction heating inductor. In addition, it is impossible to place the forging on the quenching machine tool, while flame surface quenching can fix the forging and carry the flame spray gun and nozzle for heating. The hardening layer depth can be selected according to the requirements.

As a method of surface heating quenching, especially the surface quenching of single piece and small batch forging, flame quenching is widely used at home and abroad. Up to now, it still accounts for a certain proportion in heat treatment methods, and is more widely used in Western European countries.

The disadvantages of flame surface quenching are that the quality control is closely related to the technical level of the operator. Because the fluctuation of the gas source is difficult to be adjusted and constant, the automation is difficult. Use explosive gas mixtures. The working conditions in the forging factory are poor. The extremely thin heating surface cannot control the heating.