First, the status quo of thread milling
As a method of machining thread by CNC machine tools, thread milling is first popular in Europe and America. With the development of CNC machine tools in China, it has gradually gained acceptance and love from customers in China. Thread milling is accomplished by means of the three-axis linkage function of the CNC machining center machine and the G02 or G03 helical interpolation command.
Second, the advantages of thread milling processing methods
1. Since the manufacturing material of the thread milling cutter is cemented carbide, the processing line speed can reach 80-200m/min, and the processing line speed of the high-speed steel cone is only 10~30m/min, so the thread milling cutter is suitable for high-speed cutting. The surface finish of the machined threads is also greatly improved. Threading of high-hardness materials and high-temperature alloy materials, such as titanium alloys and nickel-based alloys, has always been a difficult problem, mainly because high-speed steel wire cones have a shorter tool life when machining the above-mentioned material threads, and use hard alloy thread milling. Knife-to-hard material threading is an ideal solution. The machinable hardness is HRC 58-62. For threading of superalloy materials, threaded inserts also exhibit excellent processability 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 threaded insert, you can use a 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 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, and the machining can be continued. Threads with acceptable dimensions.
2. Similarly, in order to obtain high-precision threaded holes, it is much easier to use a threaded blade to adjust the tool radius than to produce a high-precision tap. For small-diameter threading, especially for high-hardness materials and high-temperature materials, the taps sometimes break, block the threaded holes, and even scrap the parts. With threaded inserts, the tool diameter is smaller than the machined hole, even if it is broken. Will block the threaded hole, it is very easy to take out, and will not cause the parts to be scrapped;
3, using thread milling, compared with the tap, the cutting force of the tool is greatly reduced, which is especially important for large-diameter thread processing, solving the problem that the machine load is too large to drive the tap normal processing. The machine-clamp blade type threaded blade was introduced ten years ago. It is also recognized that the use of a thread milling cutter to machine a threaded hole of M20 or more on a machining center can greatly reduce the processing cost compared with the use of a tap.
4. In recent years, the design and production technology of solid carbide threaded inserts have gradually matured, and a series of products with a full range of sizes have been developed. We have seen the development trend of threaded inserts from the threaded insert series developed by VARGUS, a world-famous carbide thread insert solution supplier, in recent years. The developed solid carbide threaded insert Millipro The series covers M1.6×0.35 to M4; the Helicool series covers M5～M19; MITM multi-blade, high-efficiency machine-clamped insert series covers M19～M60 size range; Shellmill series multi-tooth installation, disc milling threaded blade covers Large diameter thread processing of M60 to M300 and even larger size. To help users use the threaded blade solution to make their application easier and more convenient, Vargas has also developed the TMGen software system, which has been cultured to help users automatically select the tool and automatically program the corresponding thread milling CNC program. For small-diameter threading applications, an aerospace company needs to machine 50 M1.6×0.35 threaded blind holes on an aluminum part. The problem encountered by the customer is: because it is a blind hole, it is difficult to remove the chips, and it is easy to break when using tap processing. Since tapping is the last process, such as scrapping parts, the large amount of processing time spent on the part will be lost. Finally, the customer chooses the threaded insert with M1.6×0.35 thread, the linear speed Vc=25m/min, the speed S=4900r/min (machine limit), the feed per revolution fz=0.05mm/r, the actual processing time is 4 seconds / thread, complete with 50 pieces of a workpiece with a single tool.
Brass knurled insert Made of brass material, good thermal conductivity and heat resistance.
Widely Used On the Molding for Tightly Fixing.
Can be installed by ultrasonic or heat into thread tapered hole, or molded in during injection
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