Molding process of screw fastener

How do you make the screw fastener that you use?Today we’re going to analyze it.

• Common screw fastener processing technology is divided into five steps:
• Prepare wire.
• Make the head and groove of the screw with the cold header.
• Use the thread rolling machine to make the screw thread.
• Heat treatment of screws.

Then is the heat treatment process: heat treatment process is to make the screw after cold upsetting to obtain a higher hardness and strength, to achieve the metal self-tapping lock pay, improve the mechanical properties of metal parts, such as torsion, tension, wear resistance.The main steps are annealing, carburizing heat treatment (adding carbon to the metal to improve the surface hardness of the metal materials with low carbon content), tempering heat treatment (not adding elements to the metal, changing the internal structure of the metal with the change of temperature to obtain better mechanical properties.

• screw surface treatment, usually galvanized, nickel, etc.

The main contour features of the screw fastener include: screw head, groove, effective thread area, etc. The screw is the screw embryo before rolling. The processing technology of screw embryo is mainly divided into three steps.

• direct molding of the mold

High efficiency, fast processing, processing groove easy to form external characters

• milling machine molding

Groove standard, beautiful, but slow processing, not suitable for mass production

• automatic groove machining

High processing efficiency, easy to produce rough edges

Above is about the screw fastener production process, hope to help everyone. kalyn@szsst88.com