1 Introduction 4 Conclusion
The CL series full-function CNC lathe is a high-precision machine tool for various turning operations on shaft parts and disc parts. With the development of the industry, the requirements for the machining accuracy and surface roughness of mechanical parts are increasing, and the requirements for the accuracy of lathes are becoming higher and higher. In the automotive, electric power, shipbuilding, metallurgy, military, aerospace and other industries, domestic CNC lathes are playing an increasingly important role. The degree of automation of the CNC lathe defines the processing efficiency of the lathe and determines the processing scale of the lathe. The application of the servo drive produced by Dalian Andi CNC Co., Ltd. on the full-function CNC lathe provides a good solution for the domestic CNC lathe.
2 Features of full-featured CNC machine tools
The CL series full-featured CNC machine tool is a CNC machine with two-axis linkage and semi-closed loop control. The machine tool has a high rigidity structural design and shock absorption to ensure high precision machining. The servo drive and motor for controlling the X and Z axes of the feed axis are required to have high dynamic response characteristics and precise positioning accuracy, so that the tool holder of the machine tool moves quickly, stably and with high positioning accuracy. At the same time, the design of the servo turret is also adopted for the tool changer of the machine tool, which provides a guarantee for fast and accurate tool change.
For the spindle of the machine tool, it must be a high-speed, high-rigidity spindle with fast start-stop characteristics, high efficiency and low noise design, which can make the parts have high processing efficiency and high precision, and high speed means high production. effectiveness.
3 system design
3.1 Full-function CNC lathe system architecture
(1) CNC system: The CNC system of Dalian CNC-31T is adopted.
(2) Spindle system: Dalian Andy's asynchronous servo drive (ADSD-AS33-7.5K), Dengqi spindle motor (7.5KW)
(3) Feed drive system: ball screw + elastic coupling + linear rolling guide + Andy ADSD-S series servo drive system.
(4) Tool change system: Dalian Andy's synchronous servo drive (ADSD-S23 series)
3.2 Servo performance analysis
The servo performance requirements for the feed axes X and Z are mainly due to the higher dynamic response and higher positioning accuracy of the servo system. Dalian Andy Synchronous Servo is based on DSP+FPGA+IPM hardware platform, with high speed frequency response and speed response bandwidth of 450HZ, which is in the forefront of domestic servo; with resonance suppression function, it can accurately adjust and eliminate vibration; control precision can reach 1 With a pulse, the maximum input frequency can reach 500Kpps, which is a good guarantee for the required drive of the feed axis.
For the spindle servo requires fast start-stop characteristics and stable speed control, Dalian Andy asynchronous servo drive is based on DSP+IPM hardware control, with an open QMCL language, which can be set according to the user's usage.
For the tool change control of the full-function CNC lathe, Andy's synchronous servo drive is also used. The control function of the turntable is used, and the servo turret automatic tool change and the shortest can be realized conveniently without the need of a special servo turret controller. The choice of path greatly saves the PLC program writing in the numerical control system, which is more conducive to the user's use and maintenance.
The CL series full-function CNC lathes using Andy servo drives can meet the performance requirements of the machine design: the positioning accuracy of the X/Z axis is 0.016/0.020 mm, and the repeat positioning accuracy is 0.007/0.008 mm. The spindle can meet the rapid start and stop. Smooth running requirements. At the same time, the use of the servo turret can also greatly save the time of tool change and the tool change accuracy of the turret.