I. INTRODUCTION Dalian Andy CNC Technology Co., Ltd. is a high-tech enterprise jointly established by Dr. Returning Japan, Dr. Returned Overseas, and domestic automation scholars. The company is located in Dalian Gaoxin Park Overseas Students Pioneering Park. It is an automatic control enterprise specializing in R&D, manufacturing, sales and service of AC permanent magnet synchronous servo system and AC asynchronous servo system. The company can provide customers with the perfect solution.
With the continuous improvement of the living standards of the Chinese people, high-end watches and exquisite diamond rings are no longer luxury items. All kinds of exquisite furniture have also entered the homes of ordinary people. CNC engraving and milling machines are high-precision machining experts because they can be cut, boring-milled, and have high machining accuracy and high efficiency. CNC engraving and milling machines belong to the major equipment of the mold processing industry, and are generally divided into two types: mold processing and hand board processing. Because of the different processing materials and requirements, the former requires higher precision, the latter is relatively low, and has similar precision with CNC engraving machines. CNC engraving and milling machine for mold processing, positioning accuracy within 2 wires, repeatability of positioning within 5μm (shaft oscillating, radial runout), motor machining accuracy up to 2μm, bearing chamber processing accuracy is highest, generally require 3-5 The servo system used in the feed axis is a key area for servo product applications. Therefore, Andy CNC Co., Ltd. made a plan for the application of ADSD-S servo system in CNC engraving and milling machine.
Second, the engraving and milling machine structure engraving machine generally consists of numerical control system, spindle system and feed axis system. The spindle system generally uses a frequency converter to drive the electric spindle, with a maximum speed of 2 to 50 thousand revolutions per minute, and a general processing speed of 1-2 million revolutions per minute. The feed axis system is generally divided into an X axis, a Y axis, and a Z axis, which are respectively composed of three synchronous servo drivers and a synchronous permanent magnet motor. According to the machine can be divided into two types, 600-850 machines, the use of Yaskawa Σ II or Σ 850W, or Yamada 1KW servo, the current two brands of servo for the engraving and milling machine industry mainstream products; 500 machines in general Use Yaskawa 750W, Delta 750W series servo. The engraving and milling machines for mold processing are generally used mainly by Yaskawa and Sanyo; the engraving and milling machine for hand processing uses Delta 750W. Domestic servos currently have no market share. Use Andy servo, mainly divided into two types: replace Yaskawa 850W, 5.34NM servo, use Andy ADSD-S23-1.5K + ADSM-S130-060M25DK 1.5KW, Z axis control spindle up and down movement, need to use brake motor, The brake is controlled by servo drive output; instead of Delta 750W servo, ADSD-S23-0.75K + ADSM-S80-024M30DKM 2.4NM can be used to control the spindle up and down movement with Z axis. The brake motor is required, and the brake is controlled by the servo driver output. .
High-performance CNC engraving and milling machine requires a high response bandwidth, system rigidity, and good low-speed characteristics of the servo system. This requires the movable part to have good rigidity while ensuring flexible movement, which can reduce the inertia of the mechanical transmission and thus obtain a higher response frequency.
Third, engraving and milling machine control program control program:
The spindle of CNC system adopts variable frequency control and the feed axis has 3 servo output ports.
Dalian Andy CNC Synchronous Servo Driver selects the driver and synchronous servo motor according to the load conditions. Using the external position control method, the digital control system sends the AB phase pulse signal. The electronic gear ratio is 1:1.
The wiring diagrams of CNC system, servo and motor are as follows:
Fourth, the driver debugging Through Andy servo driver PC software or keyboard, you can modify the controller's parameters, in the positioning process, to maintain a high response frequency, need to maintain the motor is not vibration, adjust the basic parameters B36 speed proportional gain as large as possible, B37 speed integration time constant as small as possible; look at the motor positioning is accurate, if there is overshoot, then adjust the small B10 position proportional gain.
Dalian Andy AC synchronous servo selection and related parameters set axis XYZ
Servo Driver ADSD-S23-1.5K ADSD-S23-1.5K ADSD-S23-1.5K
Servo Permanent Magnet Motor ADSM-S130-060M25 ADSM-S130-060M25 ADSM-S130-060M25DZ
B00 2 2 2
B01 2 2 2
B10 60 60 60
B20 1 1 1
B36
B37 28 28 28
Y13
Y18
The actual debugging needs attention:
The above is the spherical surface machined by Andy servo milling machine. Please pay attention when debugging:
1. If the spherical surface appears pitted, it indicates that the rigidity of the machine tool is too high, especially the Z-axis. The machine tool generates vibration during the machining process, and the current loop and speed loop gain must be pulled down.
2. If broaching marks appear, it means that the position ring is rigid, the position tracking error is large during machining, and the position loop gain needs to be adjusted. The engraving and milling machine system requires a higher position response and needs to increase the position loop gain;
3. According to the actual situation, reduce the speed for integration time constant;
4. Z-axis speed loop should not be adjusted too high, it is easy to cause oscillation after rising and stopping;
5. The triaxial position loop gain needs to be consistent to ensure that the position tracking error is consistent, so as to ensure that the dimensions and the sphere are not problematic when machining the circle and the sphere.
V. Summary Through actual processing comparison, it has been found that using the Andy servo's engraving and milling machine processing mold can basically reach the mold, the size is fully qualified, feel good, roughness (gloss) is good, the surface gloss under the light is slightly less delicate Use the Yaskawa II engraving and milling machine to mold. For the processing of hand-carved milling machine features sufficient to meet the requirements for the mold processing milling machine can meet the requirements.
Through the actual processing observation, Andy servo motor and servo driver achieve the required response speed and accuracy, and has a more excellent cost performance, which can create more benefits for the company.