There are many screw production processes. As the saying goes, interlacing is like a mountain. An industry has regulations and processes for the same industry. Different products have different materials, different processes, and different processes. If you want to have a thorough understanding of an industry, then its business The mastery of knowledge and the understanding of basic processes are very important. Even for something as small as a screw, its production process is not simple. There are 8 main steps in the screw production process :
1. Disk Yuan
That is to say, according to the actual requirements, the manufacturer will buy the appropriate wire rod on the premise of clarifying the factory plate, product name, specification, material, weight and quantity.
2. Pickling
Remove the oxide film on the surface of the wire, and form a layer of phosphate film on the metal surface to reduce the abrasion of the tool and die during the processing of wire drawing and cold forging or forming.
3. Draw the line
Pull the plate element cold to the required wire diameter. Practically, some products can be divided into two stages: rough extraction ( peeling ) and fine extraction. The method is that after pickling the disk element, it is cold drawn to the required wire diameter by a wire drawing machine. Suitable for wire used in large screws, nuts, and threaded rods.
4. Start
Punch out the head of the screw to form a screw shape.
5. Rub your teeth
Roll or tap the formed semi-finished product to achieve the required thread
6. Heat treatment
Different heat treatment methods can be selected for different objects and purposes. Mainly quenched and tempered steel: high temperature tempering after quenching (500-650 ℃ ); spring steel: medium temperature tempering after quenching (420-520 ℃ ); carburized steel: quenching after carburizing Then low-temperature tempering (150-250 ℃ ) these three treatment methods.
7. Electroplating
The process of forming a covering layer on the surface of the workpiece by a certain method, the purpose of which is to give the product a beautiful surface and anti-corrosion effect. The surface treatment methods carried out mainly include electroplating, hot-dip galvanizing and mechanical plating.
