When we perform thread machining on a CNC lathe, we usually use a single cutting tool for cutting. When machining large pitch threads, rapid tool wear can cause significant changes in thread size and low thread accuracy after cutting. After years of exploration, we have developed a method for cutting threads on a CNC lathe using coarse and fine cutting tools. During the machining process, when the coarse turning blade wears to the limit, the fine turning blade is replaced with the coarse turning tool, and the fine turning tool is replaced with a new blade. This can ensure the accuracy of thread cutting while also reducing tool costs. The key to this method depends on the tool alignment accuracy of coarse and fine thread cutting tools.
1. Operation method
Cut both the end face and the outer circle of the workpiece (flat end face, outer circle), and then measure the diameter D of the outer circle; Replace the coarse threading tool to cut threads. The specific method is as follows:
Use a hand cranked pulse generator to first machine the outer circle D of the rough machining tool (T0X00) after cutting. Use a hand cranked pulse generator to shake out the workpiece in the positive Z-axis direction and input the D value (this tool has been aligned with the X-axis).
Record the specific data displayed on the X-axis. Feed 1-2mm in the negative direction on the data displayed and recorded on the X-axis using a hand cranked pulse generator. Similarly, use a hand cranked pulse generator to feed in the negative Z-axis direction, and the tool can cut the workpiece.
Enter Z0 (Z-axis alignment completed). At this point, the coarse threading tool alignment is complete.
According to this method, the operation steps for thread precision machining are exactly the same as the rough cutting tool alignment method. This will prevent the occurrence of misalignment during the cutting process. Even with more cutting tools, there will still be no occurrence of misalignment.
2. Precautions
1) When each tool is aligned with the X-axis, the numbers displayed on the machine tool are different. Be sure to record the actual data of each cutting tool. After exiting the X-axis, the data of multiple thread cutting tools entering the X-axis must be the same and there should be no differences.
2) During the tool alignment process, when approaching the X-axis and Z-axis of the workpiece, it is recommended to select the feed rate of 0.001mm for the hand cranked pulse generator.
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