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Thread milling adopts a thread milling tool and a three-axis linkage of machining center, that is, x-axis and y-axis arc interpolation, and z-axis linear feed milling method to process threads.
Thread milling is mainly used for machining large hole threads and threaded holes of difficult-to-machine materials. It mainly has the following characteristics:
Thread milling tools can be divided into two types, one is a machine clamp carbide blade milling cutter, and the other is an integral carbide milling cutter. The clamping tool has a wide range of applications. It can process holes with tread depth less than the length of the blade or holes with thread depth greater than the length of the blade. An integral carbide milling cutter is generally used to process holes with tread depth less than the length of the cutter.
The programming of thread milling tools is different from that of other tools. If the processing program is wrong, it is easy to cause tool damage or thread processing errors. Attention should be paid to the following points during preparation:
Large threaded holes can sometimes be encountered on box parts. In the absence of taps and thread milling cutters, a method similar to lathe thread picking can be used.
Install the thread turning tool on the boring bar to bore the thread.
The company once processed a batch of parts, the thread is m52x1.5, and the positional degree is 0.1mm (see Figure 1). Because the positional degree requirements are high, the threaded hole is large, it is impossible to use a tap for processing, and there is no thread milling cutter. After testing, the thread picking method is used to ensure the processing requirements.
To sum up, the methods of processing threads in the CNC machining center mainly include tap processing, milling processing, and thread pick method. Tap processing and milling processing are the main processing methods, and the thread pick method is only a temporary emergency method. Only by correctly selecting thread processing methods and processing tools, can we effectively improve the efficiency and quality of thread processing, improve the efficiency of the CNC machining center, and reduce processing costs. Every NC processing technician should be proficient.
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