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Inaccurate introduction of thread processing teeth

Release Date: December 15, 2017

Sometimes the deformed thread profile will appear deformed. This deformation mainly manifests as the cusp angle is too large or small, or the profile is asymmetric, and it is skewed to one side. There are several reasons for the inaccurate tooth shape.

1. The deviation of the sharpening angle of the cutter is large. The angle of the common triangular thread is 60 °, and the angle of the trapezoidal thread is 30 °. When sharpening, use the tool angle sample to measure. If it does not meet the angle requirements, you need to sharpen again. Turning tools with high accuracy requirements can be sharpened on a tool grinder, as shown in Figure 1.

2. The turning tool is not installed correctly. The center lines of the left and right edges of the thread should be perpendicular to the main axis of the lathe when setting the tool, that is, the main deflection angle and the auxiliary deflection angle of the tool are equal to 60 °. If the center line of the tool is not perpendicular to the axis when the tool is installed, the processed thread teeth will be skewed to the side, which will not allow the thread to pass through the gauge. If it is processed further, the thread shape will be thin, affecting the strength of the threaded product. . Therefore, when installing a thread cutter, be sure to use a threaded backing plate or a dial indicator to correct it. First screw one bolt on the tool holder to fix the tool, use a little bit of force, adjust the angle of the tool, and then screw the other bolt on the tool holder to see the angle of the tool. The two bolts are staggered when tightened, so as not to tighten. When the tool rotates, as shown in Figure 2.

3. Tool wear. Machining tools are mostly made of hard alloys, and thread turning tools are no exception. This is because hard alloy tools have high hardness, wear resistance, high strength and good toughness. It is necessary to adjust the appropriate cutting amount according to different processing conditions, and the durability of the tool will increase. However, any tool will wear out after prolonged use. In particular, the thread turning tool is sharper and wears faster. The thread size processed will change. At this time, the tool should be removed in time to re-grind or replace it with a new one. Figure 3 is a typical wear curve of a carbide turning tool.