High-frequency annealing method for ensuring two different hardness requirements on small part

Abstract

The invention discloses a high-frequency annealing method for ensuring two different hardness requirements on a small part. The method comprises the following steps of: performing high-hardness machining on the part; putting clean quartz sand into a clean iron box, wherein over 2 / 3 of the volume of the iron box is filled with the quartz sand; filling water in the volume of over 2 / 3 into the iron box filled with the quartz sand until dry quartz sand is just submerged so that the part can be vertically inserted into wet sand stably; washing the part with gasoline and acetone or performing sand blasting on the part by using low-air pressure fine sand; embedding a required high-hardness end of the part into the wet sand of the iron box; performing local high-frequency heating and annealing ona low-hardness position, wherein an annealing temperature is determined by conventional requirements according to different degrees of hardness; and cleaning the surface of the part by performing thesand blasting. The method can ensure the two different hardness requirements on the small part.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a high-frequency annealing method. Background technique [0002] High-frequency annealing is a heat treatment method for partially reducing the hardness of a part. This treatment is usually aimed at two different hardness requirements on a part (that is, one part of the part requires high hardness, while the other part requires low hardness) The heat treatment performed by the phenomenon. Generally, the overall quenching is adopted first to ensure high hardness, and then high-frequency annealing is performed on the part to ensure low hardness requirements. However, due to the transition zone problem of high-frequency heating parts, it is generally easy to achieve two hardness values ​​on larger parts (allowing a transition zone within 5mm in the middle part), but if the part is small, the transition zone will directly affect the hardness. The high hardness of the substra...

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Problems solved by technology

However, due to the transition zone problem of high-frequency heating parts, it is generally easy to achieve two hardness values ​​on larger parts (allowing a transition zone within 5mm in the middle part), but if the part is small, the transition zone will directly affect the hardness. The high hardness of the base body, so the conventional high-frequency annealing process cannot meet the requirements of two different hardness of small parts