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What problems often occur in the beginning of fasteners?
Fasteners are also known as standard parts. As far as the name is concerned, everyone can't understand it better, but many manufacturers often ignore some problems in the production of fasteners, resulting in the final production of fasteners in a scrapped state, such as, Fasteners are prone to problems when they are headed. If they are unreasonable, they will not be used normally. What problems often occur when fasteners are headed? China Standard Parts Network shares the following nine problems.
1. Eccentricity: Poor installation of the second punch and improper adjustment of the machine.
2. Tilted head: improper installation of one punch and improper adjustment of the machine.
3. The head is not round: the selection of a die is improper or the molding is not full enough.
4. Punching cracks: The punching mold is broken or the punching R angle is improper, causing the punching mold to be scratched by the second impact.
5. Double-layered head: Poor molding in one punch. (Guide: Four major inspections of stainless steel screws after treatment)
6. Burr: The first appearance of standard parts with poor forming after one punching is mainly caused by the excessive gap between the punching rod and the punching die hole or the short punching rod.
7. Crack angle: the punching needle is broken or the second punch is not heavy with the punching die.
8. Cracked head: For material problems, metal materials must be strictly tested with special syrup. If necessary, use heating equipment to heat the wire a little; or a die is used incorrectly, such as a die with a hexagonal washer head for the pan head , And the viscosity of lubricating oil and other reasons.
9. A black film is formed on the surface after heading and it is difficult to clean and remove: Generally, the black film layer on the stainless steel surface is eroded and removed. It can be removed by etching or chemical polishing can be used to remove the black oxide film on the surface.
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