Thread rolling (also known as thread milling) is the cold forming of the surface of round work pieces. Causing a gigantic force to be exerted between the two rotating rolling dies that form the work piece creates the thread form. As the roll die profile penetrates the work piece surface, the material in cold state is pressed all the way down into the root diameter of the thread roll die and is therefore rolled according to nominal value.
For that reason, a lead accuracy of up to Class G5 as per DIN 69051 (0.023 mm/300 mm) may be reached. This covers the better part of all market needs.
Advantages of thread rolling:
· Significant increase in hardness through cold forming
· Outstanding surface smoothness values on thread flanks and in ground radius
· Reduced notch sensitivity
· No interrupted swarf as in machine-ground threads
· Precise thread form run-out tolerances
· Rational and fast manufacture
· Enormously cost-effective especially in large production batches.
What materials are suitable?
· All metals that feature an extension of at least 6% and do not exceed a tensile strength of 1300 N/mm2
· High-alloy, corrosion and acid-resistant steel
· Special aluminium alloys
· Riveting-quality brass
· Copper alloys
· Threads can be rolled on hollow bodies and tubes only if wall thickness is sufficient; this wall thickness depends upon the type and depth of intended profile. Please call or write for further assistance.
What materials are not suitable?
· Extremely brittle material such as Ms58, cast iron, etc.
· Exceptionally soft materials such as lead
· Synthetics.
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