One, NUM system introduction
The NUM1020/1040 system is a compact and fully functional 32-bit numerical control system that is particularly suitable for CNC machine tools with 1 to 6 axes. In terms of hardware, CMOS circuits, optical fiber communication technology and modular design concepts are adopted to reduce the connection between the system and the outside, which greatly improves the electrical reliability of the entire machine tool; NUM CNC system has a strong openness and flexibility. Many of the CNC's internal information are open to users, facilitating the user's second development of the program, while providing structured programming and high-level language programming. The specific features are as follows:
1. CNC function • Control 1~6 axis, 4 axis linkage, 1~2 spindles, can be divided into 1~4 axis groups.
• Provides interactive programming modules, 2-dimensional CAD software PROFIL, ISO programming language and graphic programming language PROCAM, structured programming and high-level language programming.
• The workpiece program can have 4 protection zones.
• Custom G commands, which can be used to modify existing fixed cycles or add new canned cycles due to other requirements.
• M functions and PLC functions can call subroutines.
• External E parameter (user can read or change the CNC status via E parameter).
• Dynamic operator programming. The so-called dynamic operation is performed in each system scan cycle of the system. It uses simple operating instructions to directly process axis motion and input/output in real time.
2. PLC function • Built-in PLC.
• Input and output module design, effective isolation, output port load capacity of 2A, remote I / O module using fiber optic cable connection, simplify circuit design, improve reliability.
• Maximum 256I/O, 2 analog inputs, 1 interrupt input, 1 analog output.
• Ladder diagram and C programming, dynamic monitoring on CRT.
• PLC graphical interface editing, users can write their own graphical interface according to the characteristics of the machine.
Second, the introduction of cam grinder
The KSK company's FSK21.3 CNC cam grinder originally used a special system, tape machine input program, the machine coordinate axis is X, Z, C (see below), the original coordinate was changed to SIEMENS 611A AC servo after using DC servo, The HAIDENHAIN grating forms a full closed-loop control and the spindle uses INDRAM AT AC servo control.
Cam grinder schematic
The machine has the following special features:
G01----Spiral interpolation
G06 ---- Parabolic Interpolation
G51----Z axis oscillating grinding, defining the oscillation width and frequency: W--width, 0.2~32mm, F--frequency, 0~60HZ;
M50----Swing stop; M51----Swing start
G89 ---- radius and shape modification of wheel, call correction cycle, extract correction position file, correction data file.
Correct location definition:
K--wheel radius, R--X axis correction position, Z--Z direction start position, W--Z end position correction data definition:
A--reference address, E--number of feeds, D--number of idle trips, V--correction amount, F--feed speed linear speed programming of the grinding wheel: S--0~35 m/s
In particular, when the swing grinding function is used to perform interpolation between the X-axis and the C-axis, the Z-axis is required to swing at a certain frequency and stroke to improve the finish of the parts. This requires the system to have multi-task processing capabilities.
Third, the transformation program
According to the actual operation of the company's machine tools, SIEMENS 840C, FANUC 18 system can meet the requirements of the machine functions, but the system price is high, technical support is less, the secondary development workload, due to the shaft, spindle servo drive retention, both simulation For the interface, we chose the NUM1020GS system to retrofit the device, using the NUM system's Dynamic operator (dynamic operation function) and external E parameters to program the machine's functional requirements.
We define the functional instructions as follows:
G151: Z axis oscillation ON
G150: Z axis oscillation OFF
Format: G151 EW**EP**
Note: EW---oscillation width, EP---oscillation frequency This command is mainly used for cam finishing. When the program encounters the command G151 during execution, the Z axis will perform the oscillation with the width EW at the current position without affecting. Execution of machining programs unless cancelled with G150 command.
G100: Helical Interpolation Loop Format: G100 X**C**F**
Explanation: X, C--- the absolute coordinate value of X, C axis at the end point, F--- feed rate
G106: Parabolic Interpolation Format: G106 X**C**P**Q**F**
Explanation: X, C--- the absolute coordinate value of the X, C axis at the end point, P, Q--- the tangent angle of the starting point, the end point F--- the feed rate
G189: Grinding Wheel Correction Cycle Format: G189 EF**EN**ER**
Explanation: EF---coarse and fine correction selection, EN---correction times, ER---correction grinding wheel radius, correction position and other data are stored in the tool offset table, and are automatically calculated and changed during program operation.
G196: Main axis speed programming format: G196 ES**
Description: ES**---wheel speed
Fourth, application summary
Through the above transformation program, we successfully restored the normal processing performance of the cam grinder, which enabled the equipment that was shut down for more than one year to be put into operation again. The machine tool operation was stable and reliable, and the operation was simple.
After successfully rebuilding the camshaft grinding machine, we used the NUM1020/1040 system to retrofit the German DRH2/1500 double column vertical grinder, retrofit the German SS13 programmable jog grinder to the CNC grinding machine, and transform the German P250H programmable hobbing machine to the CNC hobbing machine. Has achieved better results.
The successful application of the NUM system in the above equipment has brought into full play its good openness and flexibility. It shows that the adaptability of the old equipment can meet the special requirements of the old machine tools, and the cost-effectiveness is high.
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