Annealing: The wire is heated to a suitable temperature for a certain period of time, and then slowly cooled to adjust the crystal structure, reduce the hardness, and improve the normal temperature processability of the wire.
Pickling: removes the oxide film on the surface of the wire and forms a phosphate film on the metal surface to reduce scratches on the tool during wire drawing and cold pier or forming.
Draw line: Pull the plate element to the required wire diameter. Practically, for some products, it can be divided into two stages: roughing (shelling) and precision drawing.
Molding: The wire is forged (or hot forged) to achieve the shape and length (or thickness) of the semi-finished product.
Tooth decay: Twist or tap the formed semi-finished product to achieve the desired thread. Practically, the bolts (screws) are called fangs, the teeth are called rolling teeth, and the nuts are called tapping.
Heat treatment: Different heat treatment methods can be used depending on the object and purpose. Quenched and tempered steel: high temperature tempering after quenching (500-650 °C) Spring steel: medium temperature tempering after quenching (420-520 °C) Carburizing steel: quenching after carburizing and then low temperature tempering (150-250 °C) Low carbon and After the carbon (alloy) steel is quenched into martensite, with the increase of tempering temperature, the general rule is that the strength decreases, while the plasticity and toughness increase.
Surface treatment: Surface treatment is a process of forming a coating on the surface of a workpiece by a certain method. The purpose is to impart an aesthetically pleasing and anti-corrosive effect on the surface of the product.
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