Thread milling began to become popular in Europe. With the development of CNC machine tools in China, thread milling of CNC machine tools was gradually accepted. Thread milling was achieved by means of the three-axis linkage of CNC machine tools. Milling planes, grooves, gears, threads and spline shafts, more complex profiles, higher efficiency than planers, and widely used in the mechanical manufacturing and repair departments.
1, the workpiece processing speed is fast
Since the current thread milling cutter is made of cemented carbide, the processing line speed can reach 80-200m/min, and the processing speed of the high-speed steel taper is only 10~30m/min. Therefore, the thread milling cutter is suitable for high-speed cutting and processing thread. The surface finish is also greatly improved. Selecting quality machine tools to look at ALLES CNC, high hardness materials and high temperature alloy materials, such as titanium alloy, nickel base alloy thread processing has always been a difficult problem, mainly because the high speed steel wire cone processing the above material thread, the tool life is shorter The use of carbide thread milling cutters for hard material threading is an ideal solution. The machinable hardness is HRC 58-62.
For threading of superalloy materials, thread milling cutters also exhibit excellent processing performance and unexpectedly long life. For threaded holes of the same pitch and different diameters, tapping can be done with multiple tools, but if you use a thread milling cutter, you can use one tool. After the tap wear and the thread size of the thread are less than the tolerance, it can not be used continuously, and can only be scrapped; when the thread milling cutter is worn and the threaded hole size is smaller than the tolerance, the necessary tool radius compensation adjustment can be performed by the numerical control system to continue. Threads with acceptable dimensions are machined.
2, reduce the problem of workpiece scrap caused by process problems
In order to obtain high-precision threaded holes, the use of thread milling cutters to adjust the tool radius is much easier than producing high-precision taps. For small-diameter threading, especially for high-hardness materials and high-temperature materials, taps, taps Sometimes it may break, gambling threaded holes, scrap parts, thread milling cutters, because the tool diameter is smaller than the machined hole, even if it is broken, it will not bet the threaded hole, it is very easy to take out, and will not cause the parts to be scrapped. Selecting the quality machine tool to look at ALLES CNC, for the same pitch, different diameter of the threaded hole, tapping requires more tools to complete, but if you use threaded insert machining, you can use a tool. Similarly, in order to obtain high-precision threaded holes, it is much easier to use a threaded insert to adjust the tool radius than to produce high-precision taps. Similarly, after the tap wear and the thread size of the thread are less than the tolerance, it can not be used continuously, and can only be scrapped; when the thread insert is worn and the threaded hole size is smaller than the tolerance, the necessary tool radius compensation adjustment can be performed by the numerical control system. Continue to machine the size of the thread.
3. Reduce processing costs
With thread milling, the cutting force of the tool is greatly reduced compared with the tap. This is especially important for large-diameter thread machining, which solves the problem that the load of the CNC machine is too large to drive the tap. The machine-clamp blade thread milling cutter was introduced ten years ago. It is also recognized that the machining of threaded holes of M20 or more on the machining center can greatly reduce the processing cost by using a thread milling cutter compared with the tap.
Usually the tapping is the last process. If the process is complicated, such as blind holes and difficulty in chip removal, the large amount of processing time spent on the parts will be lost. The design and production technology of the solid carbide threaded inserts are gradually matured, and the milling process can fundamentally solve the above problems and effectively improve the processing efficiency.
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