Cross shaft double universal joint shafts: causes and prevention measures of metal surface roughness defects. Analysis of common roughness defects1) Rough analysis of knife marksRough defect is generally reflected in the increase of cutting feed.
The friction heat generated by the friction between thermoplastic plastics is melted on the friction surface, and then the pressure is pressed, and the method of cooling under pressure is called friction welding. This method is most suitable for rotating body parts. Similar to friction welding of metals, one piece is fixed while the other rotates and pressure is applied.