Hybrid Control System Combined Tension With Position Of Slitter For Precise Stainless Steel Tape

Slitting is a further processing, that changing the wide film, strips, etc. into the products what we need. It plays a very important role in the production process. The precision of the slitting and control of the process, directly impact on products'quality and appearance rating. In stainless steel slitting process, the raw material strips through the slitting machine and machining tools horizontally. Then wind with the roll that driven by rewinding motor.In the slitting process, the tension control of the product is a very important part. The accuracy of tension control is directly related to the winding quality of products. Tension fluctuations can cause distortion, deformation and other defects. Too much tension will increase the machine load to make the materials break easily. While tension is too small, it will loosen the materials. Therefore, in order to maintain winding with constant speed and constant tension, to improve products' quality and production efficiency, an optimized tension control system is a necessary condition for an advanced slitting production line. At present, slitters made by foreign enterprises have made use of independent drive technology, the domestic research on the slitting machine focus on the host-driven control, tension control of winding and unwinding, etc.To solve the shortcomings of complex structure, low cutting accuracy and curling edges of the traditional slitter, the paper raised a tension control system without sensor on the basis of analysising process of the slitter to realize the flexible adjustment of the cutting parameters. The materials went in and out of cutting rolls used servo motor constitutional main-secondary pulling mode. By controlling the speed difference between the main-secondary pulling motor, it can indirectly control the cutting tension to realize high-precision constant tension control without sensor. Curl axis motor adopt closed-loop of speed control system that was AC motor driving by invertor. To achieve the tension control of the winding process by the position sensor and roll diameter model. And the parameter setting of the man-machine interface realizes the online modify the parameter and the timely monitor of the wind technics.Eventually, the paper designed an applied industry-class hybrid control system combined tension with position. This system is suitable for cutting stainless steel band of the thickness 0.1-0.5mm and the width of 45mm, cutting it into the narrowband of 2-4mm and the maximum cutting speed is 60m/min. The actual operation proves that the new system has the advantages of high control precision, good cutting quality, stability and reliablity.