Working Conditions and Principles of Tube Mill Rolls
Tube Mill Roll consumption is determined by three factors:
1. Tube Rolling mill, rolling material and rolling conditions, as well as reasonable selection of rolls,
2. Roll material and its manufacturing quality,
3. The use and maintenance system of the roll.
Tube Mill Rolls Working principle:
Strength, thermal crack resistance:
Usually, the main requirements for rough rolls are strength and thermal crack resistance; the work rolls of small 20-high rolling mills weigh only about 100 grams, while the weight of backup rolls of wide and heavy plate rolling mills has exceeded 200 tons. When selecting rolls, first select the main material (various grades of cast iron, cast steel or forged steel, etc.) that can safely carry the rolls according to the basic strength requirements of the rolling mill.
Hardness and wear resistance:
However, the speed of the finishing roll is high, and the final rolling product must have a certain surface quality. The main requirements for it are hardness and wear resistance. Then consider the wear resistance that the roll should have when it is used. Due to the complex wear mechanism of rolls, including mechanical stress, thermal effects during rolling, cooling, chemical effects of lubricating media and other effects, there is currently no unified index for comprehensive evaluation of roll wear resistance. Since the hardness is easy to measure and can reflect the wear resistance under certain conditions, the radial hardness curve is generally used to approximate the wear resistance of the roll.