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Thread Rolling

Forming process where a workpiece is rolled between dies for forming an externally threaded design.

Illustration of Thread Rolling

The process

The circular workpiece placed between a desktop and a variable die that has grooves corresponding to target thread. The workpiece is rolled between the two dies, under pressure, resulting in the thread pattern being pressed into the work piece without chip formation.

Chip Formation
When the cutting edge meets the workpiece, the material is deformed by shearing which results in one of three types of chip formation.
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Advantages and disadvantages
In comparison with alternative methods
High speed, saving materials
Enhances thread strength
High cost of rolls
Products with cavities are not suitable
Materials with low ductility not suitable
Limitations on the relationship between depth and diameter of the threads