Technical method for producing cup head screw

A screw is a tool that uses the physical and mathematical principles of circumferential rotation and friction of the inclined surface of an object to tighten each part of the object step by step. Screw is a general term for fasteners and is used in daily life. Screws are indispensable industrial needs in daily life. In the past, half-tooth products of hexagon socket screws with cylindrical heads were produced with the same line, which is easy to cause inconsistent feeding length of the head forming die, unstable head forming, and easy to cause the supporting surface under the head to fail to meet the standard requirements.

The thickness of the cup head screw head is out of tolerance, the appearance is not good, the metal flow line is slightly distorted, the on-site debugging and punching forming torque are unstable, the mold life is relatively short, and the technical requirements for the operator are relatively high. Due to the different skills of each operator, it is easy to cause product errors, and the error in machine adjustment time is also relatively large. Therefore, in view of the above problems, a production process of the cup head screw is proposed.

Technical elements of cup head screws: technicians provide a technical method for producing cup head screws to solve the above problems. The technical solution is: a production process of a cup head screw, the production process of the cup head screw includes the following steps:

1. Annealing, heating the plate to 500-700 °, keeping the heating time for 50-60 minutes, and then slowly cooling to adjust the crystal structure, reduce the hardness, and improve the normal temperature workability of the plate;

2. Pickling of cup head screws, A and hydrochloric acid cleaning, immersing the annealed disc element in three hydrochloric acid tanks with a concentration of 20-25% at room temperature for several minutes to remove oxide film on the surface of the disc element; B, cleaning with oxalic acid, I .e. immersing the plate in oxalic acid for 5-6 minutes; C, film treatment, immersing the disc element in phosphate for 10-12 minutes to form a film on the surface of the disc element; D lubrication: the dish element is immersed in sodium soap solution to form a hard metal soap layer on the surface to improve the lubrication performance;

3. Wire drawing: After pickling, use a wire drawing machine to cold draw the coil to the required wire diameter, which is divided into full-tooth cylindrical head hexagon socket screw line and half-tooth cylindrical head hexagon socket screw line;

4. The adjusting machine of the cup head screw forming machine, the adjusting machine of the half-tooth cup head forming, and a male mold before the machine is installed, adjust the forming height h in the mold according to the forming drawing design; Install the one to three female molds on the female mold, wherein the internal depths l1, l2 and l3 of the mold are pre-allocated according to the design of the forming drawing;

5. Forming and cutting, by moving the movable scissors in one direction, the wire clamped in the shearing mold is cut into the required blank; the stamping mold passes through the half-tooth cup head forming conditioner or the full-tooth cup head forming conditioner After being formed by the forming machine;

6, rubbing teeth, that is, cold heading blank unscrewing, with a rubbing machine to form a tooth shape;

7. Post-treatment of cup head screw rubbing teeth: heat treatment is carried out on the screw after rubbing teeth, and electroplating treatment is carried out after heat treatment to improve the antioxidant effect.

The beneficial effects of the above-mentioned cup head screw production process are: the cup head screw production process optimizes the steps of equipment debugging by distinguishing the wires used in the full half-tooth hexagon socket screws, simplifies the difficulty of equipment debugging, and improves the stability of product production, Reduce the difficulty and cost of product debugging, and improve the overall quality of the product.