Abstract: This article mainly introduces Delta B series servo, VE series inverter, Zhongda universal CNC system and its application on cylindrical grinding machines. Using the high openness of Zhongda Universal CNC System to realize the technology innovation that is different from the intuitive input of other CNC machine tools, it is easy to operate and improve the efficiency.
Keywords: servo universal CNC system cylindrical grinder high openness intuitive input
1 Introduction
The cylindrical grinding machine grinds the outer circle of the blank, and finishes the size of the blank, and simultaneously finishes the surface finish of the blank by finishing. Therefore, the cylindrical grinder is a machine tool with high machining accuracy. The processing of the workpiece is also relatively fixed, which gives Zhongda Universal CNC system provides a very open platform to show a high degree of openness.
The display screen, internal PLC, I/O point planning, and internal parameter planning of Zhongda Universal CNC System are all open, can be modified and planned according to requirements, and intuitive input of relatively fixed workpiece processing data can be realized without modification of G. The code program makes the operator's work simple, simple and efficient.
2 cylindrical grinder working principle
The cylindrical grinding machine uses two servo axes X and Y. The motor drives the chuck and the workpiece to rotate. At the same time, the grinding wheel also rotates. The axis of rotation of the workpiece and the grinding wheel is two axes parallel to the X axis. The rotation direction is opposite, and the workpiece is machined by the friction between the grinding wheel and the workpiece surface. The movement of the X axis and Y axis of the two servo axes changes the diameter and shape of the workpiece. Cylindrical grinders are high-precision machine tools, and their requirements for abutment, screw, CNC system, and servo are relatively high. Traditional cylindrical grinders use hydraulic pressure to drive the Y-axis, which limits the machining of workpieces. After the CNC is used, the controllability of the position and speed of the Y-axis and the automatic dressing of the grinding wheel by the NC program greatly increase the range of the machined workpiece.
3 CNC external cylindrical grinding machine solution based on Delta's automation platform
Due to different requirements and designs, the mechanical and electrical design of different machine tools is not the same. The openness of Zhongda Universal CNC System can meet the special requirements of each machine tool to the greatest extent.
Depending on the parent company Delta's complete range of automation products, Zhongda can provide the most cost-effective, simple, and efficient method for the machine tool customer solution. Adopting the integrated solution of CNC grinding machine consisting of Zhongda High-Opening PUTNC-H4C-2 CNC System, Delta ASDA-B Servo System, and VE Series Inverter, which can make the machine tool builders and end customers satisfied with the service and benefit the most Change.
Technical Features of 3.1PUTNC-H4C-2 Numerical Control System
Figure 1PUTC-H4C-2 CNC system
Delta PUTNC-H4C-2 CNC system shown in Figure 1. The workpiece definition screen is shown in Figure 2 - Figure 5.
(1) Open system architecture, embedded PLC, to meet the different requirements of various manufacturers.
(2) High-definition LCD display, the user can plan the screen content.
(3) Drive up to 3 servo axes (X, Y, A).
(4) With PLC development, you can customize the key functions to make the operation more flexible.
(5) Provides standard 24-point input and 16-point output, optional I / O expansion unit, 56-point input, 64-point output.
Figure 2 workpiece selection screen
Fig. 31 workpiece setting screen
Fig. 42 workpiece setting screen
Figure 5 wheel dressing screen
3.2MCM numerical parameter modification
00012500;022Tool#1radiuscompensation
00000006;058X-axis,Backlashcompensation,0~255
00000027;059Y-axis,Backlashcompensation,0~255
00001500;061X-axis,JOGFeed-rate&power-onG01speed
00001500;062Y-axis,JOGFeed-ratespeed
00000010;064X-axis,ResolutionDenominator,(Encoderpulse)
00000004;065X-axis,ResolutionNumerator,(Ball-screwpitc
00000010;066Y-axis,ResolutionDenominator,(Encoderpulse)
00000004;067Y-axis,ResolutionNumerator,(Ball-screwpitc
00003000;079X-axis,G00Traversespeedlimit
00003000;080Y-axis,G00Traversespeedlimit
00000000;082X-axis,Directionofmotorrotation,0=CW,1=CCW
00000001;083Y-axis,Directionofmotorrotation,0=CW,1=CCW
00006000;093X-axis,SoftwareOTlimit,(+)direction
00006000;094Y-axis,SoftwareOTlimit,(+)direction
-09999999;096X-axis,SoftwareOTlimit,(-)direction
-00342000;097Y-axis,SoftwareOTlimit,(-)direction
00000256;136X-axis,HomegriddirectionduringHOMEexecutio
00000256;137Y-axis,HomegriddirectionduringHOMEexecutio
00000004;141X-axis,Denominator,MPGresolutioncalc.
00000010;142X-axis,Numerator,MPGresolutioncalc.
00000004;143Y-axis,Denominator,MPGresolutioncalc.
00000010;144Y-axis,Numerator,MPGresolutioncalc.
-00000001;161X-axisPitchErrormode
-00000001;162Y-axisPitchErrormode
00060000;164X-axis lead screw pitch error compensation for each length setting
00050000;165 Y-axis lead screw pitch error compensation for each length setting
00000000; 167X-axis 40-segment compensation setting -1
-00000002; 168X-axis 40-segment compensation setting -2
-00000002;169X-axis 40-segment compensation setting -3
00000010;207Y-axis 40-segment compensation setting -1
00000006;208 Y-axis 40-segment compensation setting -2
-00000004;209Y-axis 40-segment compensation setting -3
-00000008; 210Y-axis 40-segment compensation setting -4
00000002;211Y-axis 40-segment compensation setting -5
-00000001; 212 Y-axis 40-segment compensation setting -6
-00000001;213 Y-axis 40-segment compensation setting -7
3.3 Processing Variable Definition
3.4NC Program Example
(1) New wheel dressing procedure: The new wheel dressing is to put a new flat wheel into a grinding wheel as shown in Fig. 4. One side is a circular arc with a certain radius and a certain arc. The radius and arc of this arc are calculated based on the radius and arc of the arc of the workpiece to be machined. The workpiece to be machined is shown in FIG. 4 .
O0005
G65 P#460 L3A#342B2.
G65 P#464 L31A12.5B4200
G65 P#465 L32A12.5B4200
G65 P#466 L03A12.5B#465
G65 L1P#46 1A0
G00 Y-#460
X-#341
G01V-2.F#345
N10
G03U-#466V#464R12.5
G02U#466V-#464R12.5
V-16.
V15.960
G65 L2 P#461A#461B1
G65 P10 L84A#461B250
G01V-0.01
G03U-#466 V#464R12.5
G02U #466 V-#464R12.5
V-10.
V10.
G01V0.005
G03U-#466 V#464 R12.5
G02U #466V-#464R12.5
V-10.
V10.
M02
(2) Workpiece 2 machining program: Since the grinding wheel side of the machined workpiece has an arc shape, the tool radius compensation commands G40, G41, and G42 must be used. Need to be set in the MCM parameters; 022Tool#1radiuscompensation (the first set of R radius tool radius compensation value settings).
O0002
G65 P#430 L3A#322B20.
G65 P#431 L2A#321B12.5
G65 P#432 L3A#431B#326
G65 L1 P#433 A0
N20
G00Y-#430
X-#321
G41X-#431Y-#430D1
U-#328V-#328
G01V-35.F#331
G03U#326V-#326R#326
G01V#326
G40X-#432Y-#430
G65L2P#433A#433B1
G65L84P20A#433B#332
U-#329V-#329
G01V-35.F#331
G03U#326V-#326R#326
G01V#326
G40X-#432Y-#430
U-#330V-#330
G01V-35.F#331
G03U#326V-#326R#326
G01V#326
G40X-#432Y-#430
M02
4 Delta servo system and frequency converter
4.1ASDA-A Series AC Servo System
The ASDA-A series advanced AC servo system and the ASDA-B standard AC servo system are the two mainstream servo products that Delta Electronics Group introduced in 2003 and 2005 respectively, which can meet the needs of industrial users in all fields, especially With the application of CNC machine tools, the performance is even better. Delta's servos are designed for CNC machine tools:
(1) Built-in three basic (position/speed/torque mode) control functions that can be easily connected to the host controller.
(2) The dynamic response is good, the servo setting time is 1 ms, and the acceleration time of -3000 RPM to 3000 RPM in an idle state is 10 ms.
(3) PDFF (Pseudo-DerivativeFeedbackandFeedforward) Robust control architecture is correspondingly faster and has greater ability to suppress and compensate for external disturbances, so as to ensure that when the turning moment of the turning tool or other external force suddenly intervenes, servo positioning or constant speed is affected. Rarely, as shown in Figure 5.
(4) The automatic gain adjustment function of the servo can automatically evaluate the load condition and set the servo gain reasonably, thus making the servo debugging easier and faster, and the servo positioning is more accurate, without overshoot and acceleration overshoot.
(5) Provide resonance suppression function and low-pass filter function, which can effectively compensate for mechanical deficiencies and defects.
(6) Delta's ASDA-A series advanced AC servo system has indexing positioning function. In coordination with PLC system's I/O planning, it can easily realize servo tool magazine control.
4.2 Delta VFD-VE Series Magnetic Vector Control AC Drive
VFD-VE series is Delta's new product to meet the high-end market in 2007. Its frequency output range is 0~600Hz, and V2H type output is as high as 3600Hz, which can fully meet the control requirements of CNC machine tool high-speed spindle. Using the unique position control function, with the C-axis function of the H4CL-T system, the spindle can be indexed at any angle.
VFD-VE Series AC Frequency Converter Features:
(1) Built-in V/F, vector control, torque control, and position control functions.
(2) The frequency output range is 0-600Hz, and the output of high-end models is as high as 3600Hz.
(3) Speed ​​control accuracy: FOC+PG closed-loop control, up to +/-0.02%.
(4) Low-speed torque: 0.5HZ up to 150%.
(5) Motor parameter and load inertia estimation and high-speed weak magnetic curve estimation function can be done.
(6) Mechanical brake control function and deceleration function during instantaneous power failure.
(7) Motor temperature feedback protection (PTC) function.
5 Conclusion
Today's processing industry develops rapidly, and automation products are widely used in the processing industry. It can be seen that the processing industry is moving toward automation as a whole. Zhongda general-purpose numerical control system has the characteristics of high openness and high stability. It has great development space and potential on many special-purpose processing machines. It also cooperates with Zhongda other automation products, such as servo systems, frequency converters, and coding. The overall solution consisting of devices, rail screws, etc., not only enables the customer's machine tool products to have a qualitative leap in stability and quality, but also enables the machine tool to process products that have quality and efficiency. A great degree of improvement.
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