COLD ROLLING

By | February 20, 2016

COLD ROLLING MILL

                Fig 1. COLD ROLLING MILL

It is the process by which hot rolled strip  is introduced between rollers and then squeezed or compressed to the desired thickness

Cold rolling occurs with the metal below its re crystallization temperature( usually at room temperature).

Which increase the strength via strain hardening  up to  20 %.

It also improve the surface finish and hold tighter tolerance.

In this 4HI OR CLUSTER mill is used.

Cold rolled products include sheets, strip, bar ,and rods.

These products are smaller than the products that are hot rolled.

Hot rolling can reduce the thickness more than the cold rolling.

Cold rolling material are in various condition

  • full hard
  • semi hard
  • Quarter hard
  • skin rolled

Full hard reduction thickness=50%

Other material having less reduction as compared to full hard.

In case of skin rolling also known as a skin pass having less reduction around 0.5-1 %.

It produced smooth surface, uniform thickness, and reduced the yield point.

It is used where ductility is required.

cold roll mill

DUCTILITY  is a material that can be stretched thin wire when tensile stress is applied.

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