High-end CNC machine tool application technology (4)
3. Multi-axis linkage feed CNC control
Due to the five-axis linkage, there is tool nose point programming and tool direction programming, and the change of tool direction will also cause the linear axis to generate compensation motion. Sometimes the tool vector changes greatly, the feed speed changes greatly, and the machine tool generates impact and even speed. The system alarms when the limit setting is exceeded.
Multi-axis system provides: 1 feed speed control command. 2 track characteristic control command.
Some domestic systems do not provide the most basic command G93 (inverse time interpolation) for multi-axis programming, and there are few speed control and track characteristic control commands.
Siemens uses a five-axis spline-compressor to achieve smoothing between blocks. Its advantages: 1 Non-continuous tool direction changes on the block boundary can be smoothed. 2 Tool path speed is faster and the surface roughness is improved.
Limit processing of five-axis machine tools: Due to the mechanical structure, some rotating shafts cannot rotate infinitely, and the range is limited. It is an effective method through system processing.
5-Axis Oriented Machining Programming Wizard - Visual Conversation Programming. For some more complex programming, such as coordinate transformation, high-speed machining programming, providing a visual programming wizard, can improve programming speed, and the operator can understand the program. For example: Siemens CYC800 five-axis directional machining cycle.
Siemens small line segment processing - compressor function (COMPCAD). COMPCAD principle: According to the set tolerance, compress the series G1 command to generate spline curve. Avoid machine vibration, greatly improve surface accuracy and processing speed, and reduce the impact on the machine. Each window here can be flexibly adjusted for roughing, semi-finishing or finishing. The biggest benefit of this interface is that the machine can be set to three states.
FANUC different processing software package processing accuracy and processing time comparison (see Figure 2).
figure 2
Second, the calibration of multi-axis machine tools
Turning center, turn-milling and five-axis linkage machining are correctly detected and calibrated, and regular inspections are required. Example: A, C head error compensation: C-axis center, A-axis center and spindle center error; spindle end-to-A-axis center distance.
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