Broken points:

  • Reduce the inclination angle.
  • Grind more material at the feeding end of the grinding machine and less at the output end, causing an increase in feeding and a change in the cutting form.

High stress on thread rolling dies, smoking, and hot screws:

  • Maximize the chamfering position for feeding.
  • Make the chamfer sharper, with a sharpness of 2-3mm for the short die.

Difficulty adjusting the machine:

  • The difference between the centerlines of the short and long dies must be traced back to the original centerline marking method.
  • The coordinates of the short and long dies must be consistent during chamfering, and CNC automatic control is preferred.

Dull thread bottoms and peeling:

  • The coordinates of the chamfer for the long and short dies must be consistent.
  • The anti-skid teeth generally only reach the centerline (they can be appropriately lengthened in the case of different thread lengths).
  • The anti-skid teeth must be pressed first and then chamfered or milled with a tool (must be implemented within three years).
  • The anti-skid teeth should not be too deep (specifically shown in pictures).

Peeling at the bottom of the pointed threads:

  • The milling teeth on the slope are too small or the chamfer on the slope is too large, both of which cause too much material on the slope (CNC programming has a better effect).
  • The outer diameter of the thread at the turning line is easily too large, and burrs easily accumulate at the bottom of the thread. In particular, the pointed tail of the machine screw is cut flat, the round tail, and the pointed tail of the machine screw has no teeth.

Blackening and heating at the tip, and easy wear on the slope:

  • Increasing the slope can improve the problem.
  • Push more material out while grinding the pointed tail, causing a complete change in the cutting method so that the tip is not under stress.
  • Open the chamfer on the slope for the 2nd to 4th teeth during feeding, and it is best to use CNC control.