2 key technologies (1) Four friction rigid wheel drive swing device In order to achieve the maximum power of the friction drive, the best torque driving effect is achieved, taking into account the actual situation of the tread surface and the rim wear of the repair wheel, the vertical direction of the pendulum The two directions are designed with a fretting adjustment mechanism and a safe and reliable protection locking device, so that the four friction rigid wheels can always follow the driven wheel to the tread surface. In order to avoid the instantaneous stagnation between the four friction rigid wheel and the wheel pair, the main drive of the pendulum adopts the gapless expansion sleeve transmission technology to ensure the constant line speed operation of the wheel pair at the designed speed. (2) The main drive adopts frequency conversion speed regulation technology. On the one hand, the main drive structure is simple, the speed control is convenient, stable and reliable, and the transmission noise is small. On the other hand, it can be matched with the friction drive stall automatic compensation device. When the stall occurs, the wheel is down. Speed, the NC system command immediately adjusts the cutting parameters, and also avoids the phenomenon of parking and knifeing. (3) Wheel alignment In the state where the bearing and the end cover are not disassembled, the reliable positioning on the machine tool is the key to the accuracy of the wheel tread and rim line repair. The machine tool uses the outer circle of the double-row tapered roller bearing (197726 type) which is not unloaded after the falling wheel as the positioning reference. It is composed of two semicircular halves and maintains an appropriate amount of interference and pressure matching with the outer circumference of the bearing. The device ensures that the wheelset axis is well controlled at the center of rotation set by the machine. The measured radial runout of the wheel set is within 0.1 mm. The wheel alignment axial design is designed with a side pressure guide wheel mechanism on each side. The guide wheel can rotate freely in its working position, and the buffer accumulator composed of several stacked springs is applied to the tire wheel vertically. The outer side ensures the axial positioning of the wheel pair. At the same time, it can automatically follow the axial direction with the end of the outer side, so that the axial positioning of the wheel pair is stable and reliable, and functions as a floating positioning point.定ä½ã€‚ The positioning of the axial displacement of the machine is controlled within 0. 02 mm. (4) This machine fully considers the friction-driven wheelset. During the turning process, natural physical stall occurs between the tire and the friction wheel. The severity of this stall depends on the magnitude of the counter-torque. If the cutting force is large or the tread condition is not good, the counter torque is increased to a certain limit, and the stall will be intensified, causing the wheel pair to stop, breaking the tool and interrupting the machining. To this end, a friction-driven stall automatic compensation device has been specially designed. Before the stall has not increased to the allowable value, the detection system output information data is fed back to the NC system of the machine tool, and the main motor frequency conversion system is adjusted accordingly, so that the cutting speed is quickly restored to normal, thereby avoiding accidents without damaging. Tool and wheel pair and maintain normal cutting process. (5) Applying the new technology, new materials and new technology of Sweden Sandvik turning tool, the machine tool has designed a special cutter body and tool holder, which makes the turning tool have reasonable angle, working angle and chip breaking function, which greatly improves The tool's cutting condition and chip breaking condition improve tool durability. (6) Adopting the German Siemens 802S system, the machine tool has designed a horizontal CNC tool holder, which realizes the linkage of x and z axes, and solves the repair of the LM32, LM 30, LM 28, LM 26 four treads and rims. At the same time, equipped with 2 electronic handwheels, the tool adjustment speed is controlled, which facilitates the tool setting and greatly reduces the labor intensity of the operator. 3 technical level analysis In the design process, the machine tool refers to the well-known foreign wheelset processing machine tool manufacturers, such as Germany Hegenscheidt company, Italy SAFOP company and other products, and pay attention to absorb its technical advantages. It can be seen that the main technical performance indicators of this machine tool have reached the level of similar foreign machine tools. After the completion of the development of the machine tool, it was verified by the Jiangxi Provincial Machinery Product Quality Supervision Station that the geometric accuracy and working accuracy of the machine tool were qualified. The products all met the vehicle section and station maintenance standards of the Ministry of Railways, and the average precision reserve was over 30%. The machine tool passed the technical appraisal organized by the Jiangxi Provincial Machinery Industry Department on June 30, 2000. 4 Conclusion At present, the technical performance of the wheel-to-machine machine tool is getting better and better, and the design level is increasing. For the wheel-to-machine machine tool, the bearing and the end cover are not removed, the axle box is not unloaded, and even the wheel-to-unloading rim is not developed. And the rim is its development direction. As a basic product, the vehicle wheel-to-roller CNC lathe is designed to work in a typical design, to make the parts universal, and to apply new technologies and processes as much as possible, leaving room for further development of functions in the future. And the technical performance and specific structure of this machine can be adjusted according to the specific requirements of different users in the market. In short, the development and development of the vehicle wheel-to-roller CNC lathe has greatly improved the quality and efficiency of the wheelset repair, improved the train utilization rate and safe operation, and accelerated the development of China's high-speed trains and early operation. Great significance. (Finish) Yellow Wine Without Caramel Colour Yellow Rice Wine,Jia Fan Wine,Shaoxingtian Chun Wine,Yellow Wine Without Caramel Colour ZHEJIANGGUYUELONGSHAN SHAOXING WINE CO.,LTD. , https://www.chinashaoxingwine.com
Analysis of the research and development of the drop-type lathe
1 machine tool main technical parameters
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