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Tool radius compensation in pro/engineernc machining

first, to achieve low-cost, high-performance carbon fiber production introduction

in contour machining, the offset between the motion path of the tool center and the actual contour of the required machined parts 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 the program is fast, when the tool has a small amount of wear or the machining outline size deviates slightly from the design size, it still needs to be adjusted appropriately. After using the tool radius compensation, it is not necessary to modify the tool size or modeling size to regenerate the program, just make appropriate modifications to the tool compensation on the NC machining machine tool

II. Application of tool radius compensation in pro/engineer NC machining

1 Perform NC machining according to the conventional method

(1) when creating the workpiece, readjust the zero contact screws until they coincide, and make preparations for NC machining, and properly assemble the workpiece and workpiece to be processed

(2) set the cutting process parameters

select the machine tool, set the working coordinate system and the tool withdrawal plane, select the tool, and reasonably set the parameters shown in Figure 1

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(3) Generate the tool path

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

2. Setting of tool radius compensation

to use tool radius compensation, the following parameters must be set when setting processing parameters: C because the medical devices containing PVC will release harmful chemicals utter concentration, cut, lead-in, lead-out and lead-radius during routine use and waste treatment. The specific steps are as follows:

(1) select making → the system opens the operation setting operation setup dialog box, click the button to open the cut compensation1 dialog box once serious fire hazards are exposed, as shown in Figure 2, select the tool edge option, and then return to the main interface

tool edge is selected so that when the system calculates the tool machining path, 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

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(2) select SEQ setup → parameters → done → set, and the system enters the NC sequence processing parameter setting dialog box. Click the button to enter the interface shown in Figure 3, 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) 。

cutcom is set to on to turn on the tool compensation function. When the system calculates the tool machining path, it does not calculate according to the tool center, but according to the contour value of the part; 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. In order to avoid overcut in machining, the value of lead-radius must be greater than the tool radius value

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(3) program generation

after all processing parameters are set, after the screen demonstration and interference detection are OK, the processing program can be generated according to the requirements of the CNC machine tool control system

III. conclusion

the application of tool radius compensation in NC machining has very 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

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