Introduction to the production process of pan head tapping screws
Pan head self-tapping screws have good fastening properties and are not easy to corrode. They are widely used in construction, factory and furniture industries. Today, Xiaobian talks about the production process of the Pantou self-tapping screws, and I hope to help everyone.
1. Pan head self-tapping screw production process--drawing: also known as drawing line, pumping wire to cold heading machine. Generally, a process before picking is pickling. In order to remove the oxide film on the outer surface of the wire, a surface of the phosphate film is formed to minimize the appearance of the wire and the scratch of the mold. After the wire unit is pickled, the required wire diameter is drawn by a wire drawing machine. Suitable for large length head tapping screws, nuts, self-tapping screws for the required length of wire.
2. Pan head self-tapping screw production process - molding (nail)
For ordinary pan head self-tapping screws, the first thing is to start molding, usually through a two-shot process. Head forming can be a countersunk head, a round head, a large flat head, an outer hexagon, a hexagon socket, etc.;
(1) Blocking: After moving the movable scissors in one direction, the wire stuck in the cutting die is cut into the desired blank.
(2) One punch: the die is fixed, and a die starts to shape the product head so that the next stroke can be completely formed. When the product is a slash groove, a die is a concave, elliptical groove, and when the product is a cross groove, a die is a concave square groove.
(3) Two punches: After one punch, the punch works as a whole, the second die moves to the front of the die, and the second die works forward to shape the end of the product. The billet is then pushed out by the back punch.
3. Pan head self-tapping screw production process - fangs
Generally, the self-tapping head self-tapping screw nail is made into a thread, and two dental plates are needed, one tooth plate is fixed, and the other rolling semi-finished product is moved, and the product is plastically deformed by kneading to form a required thread. In addition, if the nut is tapped and tapped - tapping.
4. Pan head self-tapping screw production process - heat treatment
Self-tapping self-tapping screws as self-tapping screws with hardness requirements, heat treatment (influencing factors) is necessary, so that the surface hardness and core hardness of self-tapping screws can meet certain requirements. The party can successfully tap the hole without being too soft to attack.
5. Pan head self-tapping screws production process - surface treatment
Appearance is the process of forming a cover layer on the exterior of the workpiece through a certain method. The intention is to give the appearance of the product a beautiful appearance and anti-corrosion effect. The external treatment methods are attributed to the following methods: electroplating, hot dip galvanizing , mechanical plating, etc. Commonly used electroplating is galvanizing, black/white nickel, blackening, phosphating, etc.; for export products with environmentally friendly quality requirements, it is necessary to remove phosphorus from trivalent white zinc, also known as environmentally friendly white zinc.
Finally, after the first five processes are completed, the pan head self-tapping screws will come out. Of course, it is necessary to carry out the screening and drying of defective products. After that, it is packaging and labeling to the shipment.
The above is about the whole process of the production process of the pan head tapping screw. I hope everyone can understand the production process of the pan head tapping screw and it will help everyone.
