Cutting speed: 40-80m/min can be selected according to the hardness of the workpiece material.
45 # or 40Cr is commonly used, and the mixed material is lower.
Modulus below 3 is a good car, so you don't have to chase knives on both sides, so you can advance directly. At first, one side advances by 2 mm, and each cutter gradually decreases, but the last cutter should not be less than 0. 1 mm, otherwise, the tooth surface roughness will be affected, and the range of iron chips in the cutting area will be red and the tooth surface will be slightly red.
Dark color, roughness above 3.2.
No matter how large the modulus is, it can be turned, and the specifications marked on the nameplate of the lathe change gear can be turned. Need to grasp the knife on both sides and repair the bottom diameter. With two or three knives.
Tool requirements: the tool body should have enough strength, the cemented carbide blade should be welded firmly, and the material should be YW 1, YW2. YT 14 can also be used (slightly brittle).
Geometric angle of cutter: radial rake angle is 0 degrees, normal working rake angle is 0 degrees, actual normal rake angle is negative rake angle equal to worm thread angle, left and right main cutting edges are 3-5 degrees, actual left cutting edge main rake angle is 3-5 degrees plus thread angle, right cutting edge is 3-5 degrees minus thread angle, two tool tip transition edges arc R0. 1, and three cutting edges are negatively chamfered. The blade width of the first radial inclination angle is 0. 1-0.2, and the second inclination angle is 5 degrees. The tip angle is larger than the thread profile angle, which can be calculated according to the normal rake angle or corrected by trial cutting.
Due to the great cutting force, it is necessary to adjust the gap between the carriage and tool rest of the machine tool and the friction plate of the spindle. In the axial direction of the workpiece, there should be a shoulder to hold the three claws and clamp them firmly. The chamfering at both ends of the workpiece thread should exceed the bottom diameter, which is beneficial to reduce the impact force when the tip cuts into the workpiece. Generally speaking, it is not necessary to lift the brake shoe (opening and closing the nut) to retract the tool. When the cutting force is too large, sometimes it can't be lifted. When changing tools, in order to avoid inertia, the tool rest will continue to move forward and the spindle will suddenly reverse. When the tool is still cutting, it will put down the clutch brake handle in advance and continue cutting by inertia.