CNC milling machining methods for thread

The traditional thread machining methods are mainly: the external thread is turned with a thread turning tool, and the thread profile can be cut out by multiple passes while working, and the production efficiency is low; the internal thread adopts tap tapping, and the thread bottom must be put into operation. The hole is machined and then the tool is changed for machining. The auxiliary time is long. With the development of numerical control technology, the machining methods of CNC milling threads gradually replace the traditional thread machining methods. Compared with the traditional thread processing method, the efficiency of thread milling and machining accuracy have been improved. Especially for some threads with special structural requirements, such as threads without transition buckles or undercuts, the use of thread milling shows its advantages. Therefore, for mass-produced threads, CNC milling threads is a new process that has a great promotion value. 
Thread milling cutters and their technological characteristics There are many types of milling cutters for threading, and various thread milling cutters have different machining characteristics. 
(1)The disk-shaped thread milling cutter disk-shaped thread milling cutter: When working, the milling cutter axis and the workpiece axis are inclined. The workpiece thread medium-diameter lead angle enters, the workpiece rotates once, and the workpiece and the milling cutter are opposite to each other. Move one pitch. It is usually possible to cut out the required threads in a single pass. The schematic diagram of the work. In order to improve the smoothness of milling, the number of teeth should be multi-toothed and made into the wrong tooth form in order to improve the cutting conditions on both sides of the blade. The disc-shaped thread milling cutter is mainly used for milling larger pitch and longer length threads, such as single or double trapezoidal thread and worm. 
(2)Comb thread milling cutter comb thread milling cutter can be seen as a combination of several disk-shaped thread milling cutters. During machining, the milling cutter is parallel to the workpiece axis, and the milling cutter and the workpiece are in full contact along the thread. Therefore, when the workpiece is rotated once during cutting, the workpiece and the milling cutter move axially by one pitch, and the desired thread can be cut out. Comb thread milling cutters are mainly used for machining triangular inner and outer cylindrical threads and conical threads with short length and small pitch. 
(3)In order to increase the production efficiency, the compound thread milling cutter can cut out the thread at one time without changing the tool. The thread milling cutter can be used. The surface of the cutting edge of the thread drilling cutter is somewhat like a tap. Actually, unlike a tap, there is no spiral lift on the tool, and the spiral in the machining is realized by the movement of the machine tool.