Cutting die is standard toosl for processing and trimming thread. The basic structure of the cutting die is a nut, axially out of the holes to form in front of the cutting teeth of the chip. Simple structure, easy to use,cutting dies in small batch production applications is very broad.

Taps for processing the internal thread, the external thread used with this relative machining tool is a circular die. Circular die structure is shown in FIG. The left and right end faces of the circular die are getting the cutting cone angle 2Ф, after the formation of the addendum by grinding the angle.

Circular die where longer part of the side of the cutting (cutting cone), said that this side is positive, write the name, grade, material grades and manufacturers ".

The rake angle of the circular die, the function of the chip flutes, the cutting portion, the rear corner and the tap is the same, but the mutual positional relationship with the workpiece tap opposite. The chips discharged from the cutting edge around the hole.

Circular Dies

The left and right end faces of the circular die are getting the cutting cone angle 2Ф, after the formation of the addendum by grinding the angle.

When set of wire, first set circular die on board braces with set screws tightened. Then sets on the outer circle of the workpiece in the rotary cutting die (or rotating workpiece) should be imposed in the axis direction of cutting die pressure. Screwed guide by sets out the thread flanks, so screwed required to maintain the vertical the cutting die end face with threaded centerline.

The middle part of the circular die calibration part, for the other side to use one end of the cutting edge wear. The heavy grinding capacity are worn in front of the flute or abandoned.

Can be used when processing the thread diameter large sheet grinding wheel cut the gap at 60 °, adjustable cutting die rack set screws so that the aperture contraction. When adjust diameter, standard samples available isotactic or by the method of trial cut to control. This becomes a circular die with the adjustment screw.

Circular die with adjusting screw can be divided into circular die, you can tune that overall circular die two circular die and without adjustment screws circular die.

Adjustable Circular Die

Adjust the circular die size of the screws can be slightly corrected to the most suitable for processing threads, so in the case of precision machining the threads and the cutting conditions change.

Overall circular die rich rigidity, even in poor cutting condition, size, and accuracy is not subject to change, can obtain high-quality threads. The outer circle of the four holes can be determined to keep the circular die size unchanged.

The cutting die thread profile shape, including surface, it is difficult to grind. The rear corners of the calibration part is not only zero, but also difficult to eliminate defects such as deformation after heat treatment. Therefore die only to processing less precision threaded.

Die shape in addition to the circular outer Quartet, hexagonal die for square or hexagonal wrench driven generally narrow processing site for the repairman. Additionally die there tubular or tile structure, the die turret lathe, automatic lathe, and fitter repair work.

Small circular die, will be used frequently in watch manufacturing and small precision machine tool plant, mainly used for processing the nominal diameter of less than 1mm thread.

Precautions

First processing the end portion of the bolt blank, a chamfer of 45 °, in order to prevent sudden loading phenomenon is generated in the guide edge of the cutting die. At the same time to ensure that the circular die or hexagonal dies vertically cut into the bolt billet.

As much as possible to reduce the diameter of the bolt blank, i.e. to ensure that the tolerances with the large diameter of the bolt close to the lower limit, so that the cutting force generated in the tapping minimized.

With edge inclination part of the die, so to ensure that the chip export the cutting area.

Use the correct coolant and a sufficient amount of cooling liquid at the cutting area.

Adjust the opening dies, shall dies open, open die tapping will workpiece scratch rather than cutting. Evenly turning the adjusting screws, the opening dies closed about 0.15mm. If the pressure acting on the side of dies, may cause dies damaged.

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