The electrical transformation part and the electrical transformation part of the numerical control system mainly replace the old electrical control system with a complete SIEMENS electrical control system and install a new CNC tool holder control system. The CNC system of this machine adopts Siemens SINUMERIK802D system. The system has multi-axis control, graphic simulation, multiple compensation, storage and recall of multiple parameters, centralized operation, automatic fault diagnosis, and various parameter display functions. The system can control up to 4 feed axes and 1 spindle, and the feed unit adopts AC servo drive system. On this lathe, the system controls three axes: the main shaft, the X-axis, and the Z-axis, and realizes the linkage between the X-axis and the Z-axis. The X-axis and Z-axis are driven by two AC servo motors. The motor is equipped with a built-in encoder and forms a semi-closed loop control with the CNC system and the drive system.
Control process. The signal of each button is input to the PLC input end of the 802D system, and is controlled by the logic of the PLC. It is output to the output control terminal of the PLC or the digital input terminal of the 6RA70 to realize various working states of the spindle control system. The specific control process Please refer to the electrical schematic and related contents in the PLC program. Feed drive system. The machine has 1 CNC tool holder, 2 feed axes, X-feed axis in the horizontal direction and Y-feed axis in the vertical direction. The movement is controlled by Siemens SINUMERIK802D CNC system, and SIMODRIVE611UE drives 2 1FK6 AC servo motors.
In order to meet the needs of cutting various types of steel roll shapes, the CNC tool system specially designed a suitable tool system according to the tool holder structure of the lathe, including turning channel steel, angle steel, round steel, I-beam, flat steel, etc. Roller type hole cutter. The effect comparison and benefit analysis before and after the transformation, the numerical control system replaces the manual control, and the precision greatly improves the accuracy of the ordinary C84125 roll lathe (within the theoretical precision of the lathe). It mainly depends on the operator's operation skill and the seriousness of the operation, and is easily manipulated by individuals. The influence of level, mood and work attitude, so the accuracy fluctuates greatly, generally greater than 0.1mm. After the lathe is modified, the accuracy of the lathe is determined by the inherent precision of the lathe and the SIEMENS802D numerical control system, especially in the case of continuous operation without external factors intervention. Underneath, basically unaffected by humans. The control precision of the CNC servo motor of SIEMENS802D system can reach 1m (1/1000mm). Considering the factors affecting the comprehensive precision (elastic deformation of mechanical parts, blade wear, elastic deformation of the tool bar, etc.), the overall accuracy of the lathe can be controlled at 0.05. About mm, and the output is stable.
Instead of a forming knives, the professional tooling system greatly reduces the working hole type of the ordinary roll lathe. When using the integral knives (about 10kg), the direction of the knives should be adjusted frequently, and different holes must use different knives. Lead to frequent tool change, labor intensity. The modified CNC lathe achieves high productivity with high speed, low feed and small inserts, and full contour machining concept. It uses carbide tools to achieve a program as much as possible. One type of blade, one tool change, the whole process is applicable, that is, in the same program, every effort is made to reduce the number of tool changes, which greatly reduces the labor intensity.
The conclusion proves that the numerical control transformation and numerical control application of the bar factory is very successful. Rolls processed by CNC lathes are 15% 25% higher than those of ordinary bed processing, eliminating defects such as torsion of rolling stock and large deviation of product geometry caused by large turning errors, reducing labor intensity and reducing product process. In the middle of waste, the negative rate is increased by about 0.3%, and the annual increase is about one million yuan. In that year, the entire investment in lathe transformation can be recovered. Although it is still in its infancy in application, the factory is researching and implementing more in-depth applications. At the same time, it plans to transform another ordinary C84100 lathe, and plans to use more advanced grating measurement technology to achieve full-closed control, further improving the processing control accuracy.
(Finish)
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