Method of processing thread

Universal threading method for CNC machining

There are generally four ways to process thread on CNC lathe. There are four cutting methods: direct cutting, oblique cutting, left and right cutting and rough cutting.

1. Direct development method; as shown in Fig. 1 (the depth of thread turning tool intermittently feeding to the teeth), when the trapezoidal thread is processed (all three parties are involved in cutting), the chip removal is difficult (increasing the cutting force and cutting heat), the tool tip of severe wear (too much feed), and the possible phenomenon of thorn. Obviously, machining large pitch trapezoidal thread and worm is not advisable.
2. Oblique method; as shown in Figure 2 (thread turning tool is the phenomenon that the Federal Reserve uses the depth of helical teeth and intermittent way along the direction of tooth angle) (when trapezoidal thread processing is in this way (thread turning tool always has only one edge to participate in cutting (so the chip discharge is relatively smooth) (the skill of force and thermal conditions is improved (not easy to cause tool turning).
3. Left and right cutting mode; as shown in Fig. 3 (the thread turning tool enters the tooth depth through the staggered gap in the direction of tooth profile angle).

CNC machining

1. Groove cutter rough groove cutting method: as shown in Fig. 4, (this method first uses slotting cutter to rough groove (then uses trapezoidal thread turning tool to process both sides of thread).

Characteristics and processing method of worm and trapezoidal thread with large pitch

The cutting resistance of turning worm and large guide wire (either oblique or left-right cutting mode) is very high (previously only high-speed steel turning tool is used for low-speed turning (production efficiency is very low). In order to be able to use carbide tools, I had to find a way to reduce the cutting depth of the blade.

The groove of thread or worm is divided into several layers (converted into several shallow trapezoidal grooves) for cutting.

Since the depth of the left cutting groove remains unchanged (the tool only needs to do left direction!) and feed along the guide rail direction (thus organically combining the left and right cutting methods with the oblique cutting method), the cutting edge can be cut once (and the cutting margin can be effectively controlled), which can guarantee the surface quality and tool life