During the cold rolling process of 310 8mm stainless steel rod for direct sale, all factors that affect the rolling pressure of the rolling equipment, the original roll gap, the tension and the thickness of the oil film will have an impact on the actual strip thickness difference, which can be summarized as the following 4 aspect.
1. The effect of temperature changes
The effect of temperature change of metallurgical spare parts on thickness fluctuation of 310 8mm stainless steel rod for direct sale is essentially the effect of temperature difference on thickness fluctuation. Temperature fluctuation is mainly caused by the influence of metal deformation resistance and friction factor.
2. The effect of tension changes
Tension is to change the deformation resistance of 310 8mm stainless steel rod for direct sale by affecting the state of stress, thereby causing the thickness to change. The change of the tension of metallurgical spare parts not only affects the thickness of the head and tail of the 310 8mm stainless steel rod for direct sale, but also affects the thickness of other parts. When the tension is too large, it will affect the thickness of the 310 8mm stainless steel rod for direct sale, and even change its width. Therefore, in the process of hot continuous rolling, the constant small tension rolling of the micro looper is generally used, while the cold continuous rolling Since the rolling is carried out in a cold state, the work hardening of the material makes it very resistant to deformation.
It is difficult to obtain the required reduction ratio only by adjusting the roll gap of the rolling equipment to change the rolling force, so it is necessary to use a large inter-stand tension for rolling. High tension is the most important feature of cold rolling production. The functions of metallurgical spare parts tension include: reducing rolling force, reducing rolling energy consumption; preventing strip deviation; controlling strip shape and strip thickness.
3. The effect of speed change
The speed is mainly affected by the friction factor, deformation resistance and bearing oil film thickness to change the rolling pressure and reduction.
4. Influence of roll gap change
When rolling 310 8mm stainless steel rod for direct sale steel, the roll gap of the rolling equipment will change due to the thermal expansion of the rolling mill components, the wear of the roll gap and the eccentricity of the roll, which directly affects the actual rolling thickness. The periodic change of the roll gap caused by the eccentricity of the metallurgical spare rolls and bearings will cause high-frequency periodic thickness fluctuations in the case of high-speed rolling.