Thread milling, as a method of machining thread using CNC machine tools, first became popular in Europe and the United States. With the development of CNC machine tools in China, it has gradually been accepted and loved by Chinese customers. Thread milling is accomplished by the three-axis linkage function of the CNC machining center and G02 or G03 spiral interpolation instructions to complete the thread milling work.
Thread milling processing method has advantages 1, the processing line speed is high Because the current thread milling cutter manufacturing material is hard alloy, processing line speed up to 80 ~ 200m/min, and high-speed steel cone processing line speed is only 10 ~ 30m /min, the thread cutter is suitable for high-speed cutting, and the surface finish of the machined thread is also greatly improved. The processing of high-hardness materials and high-temperature alloy materials such as titanium alloys and nickel-based alloys has always been a difficult problem. The main reason is that when the high-speed steel taper is used to machine the above materials, the tool life is shorter, and the carbide thread milling is used. Knife for the hard material thread processing is an ideal solution. Machinable hardness HRC58 ~ 62. For threading of high-temperature alloy materials, the thread milling cutter also shows very good processability and unexpectedly long life. For the same thread pitch and different diameter screw holes, the use of tap processing requires more CNC tools to complete, but if using a thread milling cutter, a tool can be used. After the tap wear and machining thread size is smaller than the tolerance, it cannot be used anymore. It can only be scrapped. When the thread cutter wears and the size of the machined thread hole is smaller than the tolerance, the necessary tool radius compensation adjustment can be performed by the CNC system, and then it can continue. Manufactured qualified thread.
2. Small-diameter thread processing Similarly, in order to obtain high-precision thread holes, the use of thread milling cutters to adjust tool radius is much easier than producing high-precision taps. For small-diameter threading, especially for high-hardness materials and high-temperature materials, taps sometimes break, block threaded holes, and even scrap parts; thread milling cutters, because the tool diameter is smaller than the processed hole, even if the hole is broken Does not block threaded holes and is easily removed without causing parts to be scrapped;
3, the use of thread milling machine tool load is low, compared with the tap, the cutting force of the tool is greatly reduced, this is particularly important for large diameter thread processing, solves the problem of the machine load is too large, can not drive the normal processing of the tap. The cutter-on-chisel thread milling cutter was introduced ten years ago. It is also recognized that the machining of M20 or more threaded holes in the machining center and the use of a thread boring tool can significantly reduce the machining cost compared with tapping.
4, design and production technology is maturing The design and production technology of solid carbide thread milling cutter gradually matured, and developed a series of products with a complete range of sizes. We can see the development trend of thread milling cutters from the thread milling cutters developed by VARGUS, a world-renowned supplier of hard alloy thread cutting solutions. The Millipro series of milling cutters covers M1.6×0.35 to M4; the Helicool series covers M5 to M19; MITM multi-blade, high-efficiency thread milling cutters range from M19 to M60; Shellmill series multi-tooth mounting, disc milling Thread milling cutters cover large-diameter threads from M60 to M300 and larger. In order to help users to use the thread milling cutter solution to make its application easier and more convenient, Wages also developed the TMGen software system and has Chinese culture, which can help the user to automatically select the knife and automatically program the corresponding thread milling CNC program. . For small-diameter thread processing applications, an aeronautical enterprise needs to process 50 M1.6×0.35 blind holes in an aluminum piece. The customer has encountered a problem that, because it is a blind hole, it is difficult to remove chips, and it is easy to break when using a tap. Since tapping is the last process, such as scrapping a part, much of the processing time spent on the part will be lost. Finally, the customer chooses to use a thread milling cutter with M1.6×0.35 thread. The line speed is Vc=25m/min, the speed is S=4900r/min (machine limit), the feed per revolution is fz=0.05mm/r, the actual machining time For 4 seconds/thread, all 50 pieces are completed with one tool.
5, to extend the tool life A knife body production enterprises, because the hardness of the body is generally HRC44, for the small diameter screw holes compacting the blade, using high-speed steel cone processing is more difficult, tool life is shorter, easy to break, for M4 × 0.7 The thread processing, the customer selects the overall carbide thread milling cutter, Vc=60m/min, Fz=0.03mm/r, processing time 11s/thread, the tool life reaches 832 threads, the thread finish is very good.
For medium-diameter thread processing, there are M12×0.5, M6×0.5 and M7×0.5 threaded holes with different sizes and the same pitch on the aluminum parts that a company needs to process. Previously, three kinds of taps were needed to complete the processing. Thread milling cutters are now used. Cutting conditions: Vc=100m/min, S=8000r/min, fz=0.04mm/r. The machining time of one thread is 4 seconds, 3 seconds and 3 seconds respectively. One tool can be processed. 9000 threads, after completing the entire batch of parts processing, the tool has not been damaged.
6, widely used in large-scale power generation, metallurgical equipment processing industry, pump, valve processing industry, thread milling cutter to solve the problem of large-diameter thread processing, high-efficiency, low-cost ideal tool. Such as a valve parts processing enterprise, need to process 2 "× 11BSP-30 thread, the material is cast steel, and hope to improve the processing efficiency. Through the use of multi-flute flutes, multi-cutter clamp milling cutter, using Vc = 80m / Cutting parameters of min, S = 850r/min and fz = 0.07mm/r achieved a machining time of 2 min/thread and 620 blade life, which effectively improved the machining efficiency of large-diameter threads.
7. The low-cost, high-efficiency thread milling cutter, as a kind of advanced tool developed rapidly in recent years, is being accepted by enterprises more and more, and has demonstrated excellent processing performance. It has become a company to reduce the cost of thread processing, improve efficiency, and solve A powerful weapon for threading problems.
