The follow-up profiling function means that the workpiece can be processed according to the shape and size of the sample. However, due to the limitations of the previous profiling function, the efficiency is low, the safety and reliability are poor, and the data collection is not intuitive. In response to this problem, this paper proposes a new implementation of the profiling function. The method is suitable for workpieces with more complicated shapes, which advantageously improves processing efficiency and saves machining auxiliary time. 1. Function introduction The follow-up profiling device is installed under the beam and driven by the Siemens motor. It is driven by the gear and the turbine reducer rack. The probe is moved under the beam and extends in the X-axis direction (CNC axis). The probe contacts the surface of the workpiece (the workpiece is equivalent to the contour plate). When the surface of the workpiece is uneven, if the surface is not convex, the probe is retracted, and the grating scale is moved to make the reading head and the fixed length relatively displaced. That is, the probe sends a signal to the tool holder servo motor as the surface shape of the workpiece is different, and the axis is controlled to move accordingly. This machine tool (see Figure 1) has a tool holder. The Y 1 axis of the probe reciprocates horizontally. The Y 2 axis of the probe is driven to reciprocate by rotating the workpiece. The X axis moves in the horizontal direction and the Z axis moves in the vertical direction. Reciprocating motion, the workbench drives the workpiece to make a rotary motion. 2. Hardware driver application The hardware uses 611D module X411 motor encoder interface measurement 1, X421 probe scale interface measurement 2, the probe motor feedback line is connected to the module X411 measurement port, and the profiling probe with HEIDENHAIN grating is connected to the X421 measurement port. 3. PLC program application Objective To use the PLC program to process the axis signal control measurement port 1, 2 to switch the measurement signal between the actual axis and the virtual axis. The probe movement mode: the effective axis signal DBX1.5 measurement port 1, DBX2.1 controller enable DBX21.7 pulse enable, at this time the Y axis is the actual axis, which can be moved by the motor to drive the probe. The probe feedback mode: the effective axis signal DBX1.6 measurement port 2, and the DBX1.4 follow mode is valid, so Y The axis becomes a virtual axis, and the HEIDENHAIN encoder is driven to reciprocate by rotating the workpiece, and the coordinate values ​​are sent to the NC system as a condition for linkage control. 4. NC parameter application Objective To define the actual axis Y 1 of the probe and the virtual axis Y 2 of the probe by using the axis data setting to ensure the two control modes of the probe. The movement and feedback functions can be separated separately to meet the actual requirements. The data settings are as follows: Value output type 30130, actual value encoder class 30240, actual value drives input 30230 on the measurement board. 5. NC programming instruction application Objective To realize synchronous follow-up motion by using advanced programming instructions, realize X-axis movement by Y 2 axis control, TRAILON activate linkage function, TRAILOF close linkage function, use Siemens linkage instruction programming, write in the program: FFWON (feedforward function) TRAILON (X1, Y2, 1) [Link function (X axis follows Y 2 axis motion)] G1G91Z-10F10 (Z-axis feed) M05 (spindle stop) M30 (end of program) When the TRAILON command is executed, the movement of the probe pushes the reciprocating motion of the grating by the rotation of the workpiece to feed the data back to the Y 2 axis, and the coordinate of the Y 2 axis is used to control the X axis motion in real time by using the command TRAILON (X 1, Y 2, 1).
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