29

2017

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12

The impact of electrophoretic coating process on the fatigue life of steel plate springs.

Author:

The potential impact of heating and curing the electrophoretic coating on the residual stress and fatigue life of steel plate

The potential impact of heating and curing the electrophoretic coating on the residual stress and fatigue life of steel plate springs after shot peening. The heating and curing temperature of the electrophoretic paint film is 160~170℃, with a time of 30 minutes. This process may adversely affect the residual stress of steel plate springs after shot peening, thereby shortening the bench fatigue life and actual service life of the steel plate springs. Eight shot-peened steel plate springs were randomly selected from the production line, of which 4 were only shot-peened without coating, and the other 4 underwent electrophoresis and baking curing (temperature of 190℃, time of 30 minutes), and then residual stress measurement was performed using an X350 stress detector.
 
The test results show that the deviation of residual stress values in both cases does not exceed 5%, which is less than the allowable test fluctuation difference (±13MPa), proving that the heating and curing of the electrophoretic paint has no significant effect on the residual stress of steel plate springs after shot peening. In addition, a bench fatigue life comparison test was conducted between electrophoretic coated steel plate springs and electrostatic coated steel plate springs.
  
The results indicate that the bench fatigue life of the electrophoretic coated products is slightly higher than that of the original electrostatic spray products (generally higher by 5%~10%).
 
a. Adding a middle coating can greatly improve the orange peel of the topcoat.
 
b. The appearance of the vehicle body with a middle coating not only reduces the orange peel feel of the entire vehicle but also improves the fullness of the paint on the entire vehicle.
 
c. The middle coating significantly enhances the glossiness of the entire vehicle.

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