Vacuum Heat Treatment of Hollow Linear Optical Axis

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There are solid and hollow linear optical axes, and the structure and performance of the two are different. In contrast, the weight of the hollow linear optical shaft is definitely much lighter, so the self-weight of the shaft is also reduced a lot, so that the effect of the transmission torque on the central part of the hollow linear optical shaft will also become smaller. From a structural point of view, the hollow linear optical axis is mainly composed of a shaft body, a through hole, a large cylinder, a cylinder, a small cylinder, an inner keyway and an outer keyway. The big change is the setting of this through hole, and All have strict size requirements.

The hollow linear optical shaft is a product that can be used, so it has a certain guiding effect on the sliding bearing and is an indispensable part of the whole device. In addition, in order to meet various requirements, the surface quality and material of the hollow linear optical axis should also be strictly checked, and the best state should be maintained as much as possible.

The heat treatment process of the hollow linear optical axis generally includes three processes of heating, heat preservation and cooling, and sometimes only two processes of heating and cooling. These processes are interconnected and uninterrupted. The vacuum heat treatment process can be roughly divided into three categories: surface heat treatment, chemical heat treatment and overall heat treatment.

1 Surface heat treatment

Surface heat treatment is a metal heat treatment process that only heats the surface layer of the hollow linear optical axis to change the mechanical properties of the surface layer. In order to only heat the surface layer of the hollow linear optical axis without allowing too many hot stars to pass into the interior, the heat source used must have a high energy density, that is, a larger amount of heat energy is given on the hollow linear optical axis per unit area, so that the hollow linear light The surface layer or part of the shaft can reach high temperature for a short time or instantaneously. The main methods of surface heat treatment are flame quenching and induction heating heat treatment. Commonly used heat sources are flames such as oxyacetylene or oxypropane, induced current, laser and electron beam.

2 chemical heat treatment

Chemical heat treatment is a metal heat treatment process that changes the chemical composition, structure and properties of the surface layer of the hollow linear optical axis. The difference between chemical heat treatment and surface heat treatment is that the latter changes the chemical composition of the surface layer of the hollow linear optical axis. Chemical heat treatment is to heat the hollow linear optical axis in a medium (gas, liquid, solid) containing carbon, nitrogen or other alloying elements for a long time, so that the surface of the hollow linear optical axis infiltrates carbon, hydrogen, boron and chromium and other elements. After the elements are infiltrated, other vacuum heat treatment processes such as vacuum quenching and vacuum tempering are sometimes performed. The main methods of chemical heat treatment are carburizing, nitriding, and metalizing.

3 Overall heat treatment

The overall heat treatment is a metal heat treatment process in which the hollow linear optical axis is heated as a whole, and then cooled at an appropriate speed to change its overall mechanical properties. The overall vacuum heat treatment of steel generally has four basic processes: vacuum annealing, vacuum normalizing, vacuum quenching and vacuum tempering.

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