What are the surface defects of fastener products?

What are the bad phenomena of fastener products? And what are the reasons for these bad things? Let's make a brief introduction

1. Analysis of the bad phenomena and causes that are easy to occur in the head

1. Eccentricity: Poor installation and improper adjustment of the second punch.

2. Tilt head: poor installation and improper adjustment of the first punch.

3. The head is not round: the selection of a punch is improper or the punch is not full enough.

4. Cracks in the mold: The mold is broken or the R angle of the mold is improper, so that the mold is scraped by the second impact.

5. Double-layer head: poor forming in one punch.

6. Burr: poor forming in one punch, mainly caused by too large gap between punch and die hole or too short punch.

7. Crack angle: the punching needle is broken or the second punch is not heavy with the punching.

8. Cracked head: material problem, or the wrong use of a punch (such as a punch with a hexagonal washer head for a pan head), and the reason for lubricating oil.

2. Tooth rolling is easy to produce adverse phenomena and cause analysis

1. Processing cracks: the tooth plate is worn out and the machine is improperly adjusted.

2. Blunt tail: improper adjustment, the tooth plate is too old.

3. Burning: the distance between the two tooth plates is too large, or the feeding time is wrong.

4. Crooked tail: The control screw on the tooth plate seat is too tight.

5. Broken tail: tooth plate wear and improper adjustment.

6. Asan is not full: improper adjustment

7. The tail teeth are not rubbed to the tip of the tail.

8. Crooked rod: The correction block is not corrected.

9. The bottom of the tooth is rough: the tooth spacing is not adjusted properly.