The screw production equipment required for the entire screw production process is roughly divided into: a wire drawing machine, a cold heading machine, a boring machine, etc.; the following describes the production process:
First, the screw production process - drawing: also known as drawing, pumping wire to the 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 screws, nuts, self-tapping screws for the required length of wire.
Second, the screw production process - molding (nail embryo)
For ordinary 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.
Screw, screw
(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. Brushing
Third, the screw production process - fangs
Generally, the 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.
