On-board probe detection
The accuracy and repeatability that standard Machine tools can achieve today are close to the level that only CMM coordinate measuring machines can achieve in the past. This function allows the machine itself to automatically detect the workpiece with a probe during critical machining processes. Once the measuring instrument is installed on the machine, the measuring probe becomes the operator's CNC meter. The inspection program can be programmed as part of the machining process and automatically run at various points to detect size and position and provide the necessary compensation. This eliminates the need for operators to use dial gauges and plug gauges to measure and eliminate artifacts caused by fixtures, parts and tool offsets in the control system. On-board inspection has become a part of the process, an improved and powerful process tool that produces qualified parts for the first time in the shortest production time.
Can be used to automatically determine the position of the part, and then establish a working coordinate system, on-board inspection can reduce the set-up time, improve the utilization of the spindle, reduce the cost of the fixture and eliminate the non-production processing transit time. In the complex part processing, it took 45 minutes to debug the fixture. The application of the detection device is only 45s and all of them are automatically operated by CNC. When starting to machine castings or forgings, the inspection device determines the shape of the workpiece, avoids wasting time due to empty cutting, and helps determine the optimum tool entry angle. The control during the process is to use the detection device to monitor the machine characteristics, size and position during the cutting process, and to verify the exact dimensional relationship between the various features of each process to avoid problems. The probe can be programmed and the actual machining results at each stage can be tested programmatically and then automatically compensated for tool offsets, especially after roughing or semi-finishing.
The reference test compares the feature of the part to a reference template of a size template or known position and size. It enables the CNC to determine the positioning gap and then generate an offset to compensate for this difference. By performing inspection of the counterfeit template before the critical machining, the CNC can check its own positioning for the known dimensions of the template and then program the offset. If the size template is mounted on the machine and exposed to the same environmental conditions, the reference test can be used to monitor and compensate for the thermal expansion coefficient. The result is a closed loop process that is not affected by the operator.
Each machine has many inherent small errors in its motion and in its structure. Therefore, there is always a slight gap between the programmed position of the CNC and the actual position of the tool tip, even in both. After laser compensation, the adjustment is fairly consistent. Programmable artificial template testing is a good way to further compensate for the rest of the machine. It provides feedback for process control and enables positioning accuracy to be close to the specifications of machine repeatability. This closed-loop process control allows the machining center to achieve machining levels that are comparable to those of boring mills and other precision machine tools.
Many probe detection operations are done using a memory-resident macro program. The update of the working coordinates, the change of the tool geometry and the measurement of the parts are automatically determined by the CNC after the successful completion of the probe detection cycle. This eliminates the serious errors caused by incorrect information links or incorrect calculations. For post-processing part inspection, probe inspection can reduce the length and complexity of off-line inspections, and in some cases even eliminate them all. Since large and expensive workpieces are very difficult to move and time consuming, on-board inspection is particularly advantageous for large and expensive workpieces.
Here, two methods can be used to complete the reference detection, that is, using the machine tool correlation detection method to compare the measured data on the machine with the previous CMM measuring machine data; or using the counterfeit sample detection method to compare the on-board data with the known size. The traceability of the model was compared for comparison. In making this comparison, the CNC is able to determine if the machine has actually reached the specified machining tolerances. Based on these results, an informed decision can be made to take the correct approach to the artifacts that remain on the machine.
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