I. Introduction
With the rapid development of China's economy, there is an increasing demand for high-speed, high-precision engraving and milling machines in the market. As the name suggests, engraving and milling machines can do both fine engraving and cutting and boring and milling. To a certain extent, it can not only replace the engraving machine, but also can replace some small machining centers. The scope of application is quite extensive. In the abrasive industry, electronic information industry, the automotive industry and even the traditional hardware, furniture and other industries have this huge application needs , The market prospect is broad, and the numerical control high-speed engraving and milling machine as the key application industry of the servo product, can test the performance of the servo product best. A carving and milling machine generally needs 3-5 servo motors to perform high-speed feeding. It can be seen that the demand for servo products is very large. The range of the selected servo motor is generally from 200W to 1KW depending on the workbench, the size of the workpiece and the weight. between.
The customer who selected Berggast’s servo was a milling and milling machine manufacturer in Hangzhou. The company’s selection of servo products is very strict. Its products have been known for its good performance and stability in the industry. Prior to this company, the company had always used Japanese servo products and applied it well. The current competition in the engraving and milling machine market is increasingly fierce, and cost pressures are high. Therefore, the company has always been looking for more cost-effective servo products. After contact with the trial, the customer tested the Bergdata servo product. After comparing, it was found that the dimensions and finish of the parts processed by the equipment of the equipment and the trial Japanese products were exactly the same. The customer acknowledged the servo products of Baghdad.
Second, engraving and milling machine system structure
General engraving and milling machine structure includes the following parts: CNC system, spindle system and motion feed system, the company's engraving and milling machine is composed of dedicated control card, the customer independently developed control program, spindle system uses imported foreign integrated type of electricity The spindle is driven by a domestic inverter. The exercise feed system consists of three servo motors. One of them is used for X-axis feed, one for Y-axis feed, and one for Z-axis feed. The X, Y axis motion feed system consists of a ball screw, an elastic coupling, a linear guide, a servo motor, etc. The servo motor is selected from Bergdat 750W servo products. The Z-axis motion feed system is also composed of a ball screw, an elastic coupling, a linear guide, and a servo motor. The Servo motor uses a 400-kW servo motor with a brake.
The enterprise's engraving and milling machines are designed with extra-wide columns and beams, which have excellent symmetry and excellent rigidity. The moving part widens the distance between the guide rail and the guide rail to overcome the problem of poor torque. . This is the preferred equipment for high-speed cutting. This structure basically ensures that the rigidity of the non-moving part of the engraving and milling machine is as good as possible, while the moving part maintains a good rigidity while maintaining flexibility. And it also helps to minimize the mechanical moment of inertia without affecting the stiffness of the mechanical system. A smaller mechanical moment of inertia ratio ensures that the servo system has a high response frequency. The requirements for servo performance of the engraving and milling machines are high response frequency, high system rigidity, and good low-speed characteristics. Its structure is as follows:
Second, Baghdad servo debugging process
According to the characteristics of high response frequency, strong system rigidity and good low-speed characteristics required by the engraving and milling machine industry, with reference to the experience of Berggast servo in many similar industries, some adjustment parameters are as follows:
Pn-5=200 (position proportional gain)
Pn-6=40 (position feed forward)
Pn-7=50 (position feedforward low pass filter cutoff frequency)
Pn-17=150 (speed proportional gain)
Pn-18=35 (speed integration time constant)
Pn-19=250 (speed detection low-pass filter)
Conclusion
After several months of trials, the customer acknowledged the quality and performance of Berggda's servo products. At the same time, it was also very satisfied with the cost-effectiveness of Berggda products and the timely follow-up service of Baghdad. The successful cooperation between Baghdad servo and domestic well-known engravering and milling machine enterprises indicates that the servo product performance of Bergda has reached the first-class level of servo products at home and abroad, and it has played a very positive role in the overall promotion of Berggda servo in the industry. !