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Process discription about spray-reflowed surface of roll and shaft

Process discription about spray-reflowed surface of roll and shaft

 

Coating design

The coating design takes the priority over our product design in accordance with the application. It is a very important procedure for the final desirable performances of the abrasion resistant coating. Taking the approach roll of bar cooling bed for example, we respectively design the primary coat, working coat and face coat in order to get the abrasion resistant coating suitable to the roll.

   

Surface passivation and deoiling

Surface passivation and deoiling should be taken before hot spraying.

   

 

Metal powder hot-spraying

Spray torch evenly sprays the metal powder from a set formula over the outside surface of the cylinder. In this procedure, the coating quality is affected by the ajustment of flame, distance between jet and the surface, travel speed of the torch, revolving speed of the workpiece, and the powder output altogether.

 

 

   

Induction reflow

Induction reflow is carried out by special equipment. The setpoint control is the crux. This picture shows the induction reflow on the approach roll of bar cooling bed.

 

 

   

Finishing

For most of the workpieces, there should be refining process after surface-hardening treatment to meet the application requirements.

   

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