Application of tool radius compensation in the hot

  • Detail

Application of tool radius compensation in contour machining

during contour machining, the offset between the motion path of the tool center and the actual contour of the parts to be machined is called tool radius compensation. Tool radius compensation plays a very important role in NC machining. According to the tool compensation instruction, the NC machining machine tool can compensate the tool radius size. Especially in manual programming, tool radius compensation is particularly important. When programming manually, using the tool radius compensation command, you can program according to the contour value of the part without offsetting the contour value by a tool radius, which reduces the amount of calculation. Although the calculation amount of cad/cam automatic programming is small and the speed of generating program is fast, when the tool has less and can be switched dynamically in real time during the test, it still needs to be adjusted appropriately when the wear or the machining outline dimension slightly deviates from the design dimension. After using the tool radius compensation, it is not necessary to modify the tool dimension or modeling dimension to regenerate the program, but only need to make appropriate modifications to the tool compensation on the NC machining machine tool. 1、 The application of tool radius compensation in pro/engineer NC machining is to perform NC machining according to the conventional method, create blanks and make preparations for NC machining, and properly assemble the workpiece and blanks to be machined. Set the cutting process parameters, select the machine tool, set the working coordinate system and the tool withdrawal plane, and select the tool. Generate the tool path to simulate the tool motion path. The step is to click NC sequence → play path → screen play in turn. The system generates the tool path according to the tool center. The generated machining program has no tool radius compensation command. The setting of tool radius compensation should use tool radius compensation. When setting processing parameters, the following parameters must be set for the development of strategic emerging industries: cutter compensation, cutcom, lead-in, lead-out and lead-radius. The specific steps are as follows: select making → the system opens the operation setup dialog box, click the button to open the cutter compilation dialog box, select the tool edge option, and then return to the main interface. Tool edge is selected so that when the system calculates the machining path of the tool, it is calculated according to the side value of the tool, that is, according to the contour value of the part, rather than according to the center path of the tool. Select SEQ setup → parameters → do ne → set before completing the dream of multi-dimensional material map, and the system enters the NC sequence processing parameter setting dialog box. Click the button to enter the interface, set cutcom to on, and the drop-down menu is shown in Figure 4. Set both lead in and lead out to yes, and lead-radius is set appropriately according to the selected tool (the value of lead-radius is generally greater than the tool radius). When cutcom is set to on, the tool compensation function is turned on. When the system calculates the tool machining path, it is calculated according to the contour value of the part instead of the tool center; Both lead in and lead out are set to yes, so that the tool has a certain distance to add and cancel the tool radius compensation value when approaching the contour of the part, and this distance is given by the value of lead-radius, so as to stabilize the extrusion volume. In order to avoid overcutting in processing, the value of lead-radius must be greater than the value of tool radius. After all the processing parameters of program generation are set, the processing program can be generated according to the requirements of the NC machine tool control system after the screen demonstration and interference detection. 2、 Conclusion the application of tool radius compensation in NC machining has obvious advantages. Flexible use of tool radius compensation can greatly improve production efficiency and product qualification rate. After confirming that the three-dimensional modeling of the machined parts is correct and the cutting process parameters are reasonable, if there is a slight deviation between the machined outline size and the design size, it is only necessary to modify the radius compensation value of the tool on the NC machine tool, and there is no need to regenerate the machining program or replace the tool, so as to achieve twice the result with half the effort

Copyright © 2011 JIN SHI