1. The screw head is deformed and the head is skewed. The possible cause is improper installation of the first punch of the screw mold and improper adjustment of the machine.
2. The head of the screw is not round. The reason is the improper selection of the first die of the screw die or the insufficient filling of the first die.
3. The screws have burrs or burrs. The reason is that the first punch is poorly formed, which is mainly caused by the excessive gap between the punch rod and the die hole or the punch rod is too short.
4. The screw head is cracked, and the screw head has cracks. The reason may be that the quality of the screw wire itself is defective, so before the screw wire is headed, it must be inspected by the quality department and tapped with a lotion. Especially for stainless steel screw wire, it is necessary to check that it is stainless steel 201 and that is stainless steel 304. It may also be due to the wrong use of a die (such as a die with a hexagonal washer head for the pan head), and the viscosity of the lubricating oil and other reasons.
