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How are Screws Made

How are screws made on screw heading machine?

Introduction

How are screws made as small parts commonly used in daily life? Screws are widely used in car bodies. Generally, they are made of metal or plastic, in a cylindrical shape, and concave convex grooves engraved on the surface are called threads. The main function of the screw is to connect two objects or fix the position of an object. Screws can usually be removed or re embedded at will without compromising their efficiency

Cold forming Vs machining

There are two ways to make a screw starts from metal steel: cold forming by header or machining.

Machining:

reaching the ideal shape by removing the material. Its advantages are high machining precision, no tooling limited. Its Disadvantages are high cost and low processing speed.

Cold forming by header:

Reaching the ideal shape by forming with the help  of header force and a tooling (die and punch) fixed on the heading machine.

Its advantages are high speed low cost for mass production. Its Disadvantages is tooling limited for different parts.

Screw making process flows:


screw making process flow



Screw cold forming

common screw:

common screw forming


large head screw:

large head screw forming


Tread rolling

The cold heading blank is rolled out of the thread on thread rolling machine, and the screw thread is formed through the interaction between the movable thread flat die and the fixed thread flat die .


thread rolling process flow




Edited by:FMT|fastenermachinetool.com



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