Roller technical details of FCW forming machine

Hot cracking resistance

Usually, the main requirements for rough rolling rolls are strength and resistance to thermal cracking; The working rolls of a small 20 roll mill weigh only about 100 grams, while the supporting rolls of a wide and thick plate mill weigh over 200 tons. When selecting a rolling mill, the first step is to select the main material for safe bearing based on the basic strength requirements of the rolling mill for the rolling mill (various grades of cast iron, cast steel or forged steel, etc.).

hardness

The speed of the precision rolling mill is relatively high, and the final rolled product must have a certain surface quality, with hardness and wear resistance as the main requirements. Then consider the wear resistance that the rolling mill should have during use. Due to the complex wear mechanism of rolling rolls, including mechanical stress, thermal effects during rolling, cooling effects, chemical effects of lubricating media, and other effects, there is currently no unified index for comprehensively evaluating the wear resistance of rolling rolls. Due to the ease of measuring hardness and its ability to reflect wear resistance under certain conditions, the radial hardness curve is generally used to approximate the wear resistance index of the rolling mill.

Impact resistance

In addition, there are some special requirements for the rolling mill, such as strong biting ability and impact resistance when the pressing amount is large;

Smoothness

When rolling thin specification products, strict requirements are placed on the rigidity, uniformity of microstructure and properties, processing accuracy, and surface smoothness of the rolling mill rolls;

Cutting performance

When rolling complex section steel, the cutting performance of the working layer of the roll body should also be considered.

When selecting rolling rolls, some performance requirements are often contradictory to each other, and the purchase and maintenance costs of rolling rolls are very expensive. Therefore, the advantages and disadvantages of technology and economy should be fully weighed to decide whether to use cast or forged, alloy or non alloy, single material or composite material.