Compared to the high speed steel dies and ordinary dies, there are obvious advantages in hardness, red hardness and wear resistance. In recent years, the application of high speed steel dies gradually gained popularity, especially export dies, occupy a large proportion of the number of high speed steel dies . Design and manufacture of high speed steel dies , in principle, the same as ordinary dies. The manufacture of the ordinary dies 9SiCr material, quenching thread size small deformation, isothermal process control sizing dies thread size and good toughness. High speed steel dies W6Mo5Cr4V2 high temperature hardening heat treatment threads size large deformation, easy cracking and decarburizations.

In the design and manufacture should pay attention to:

(1) From the exterior design of the dies on the control and reduction of the deformation
the dies thickness E can not be too thin, especially the fine thread the dies thickness not less than 12 pitch. A thickness between the chip hole and die diameter is not too small, its value e take an ordinary dies size limit, e = (0.8 to 1.0) D1 / 2.

(2)During the heat treatment, the high speed steel, the blade back greatly distorted, so that the threaded ovality trend more significantly, resulting in the thread dimensions have a reduced amount. An additional amount of deformation in design dies taps, the original size, to meet the design requirements to meet the minimum size of the thread.

(3) Enhance the strength of the blade back
Blade back width is a very important structural elements and its size must be carefully chosen for high speed steel dies. For reducing the high-speed cutting, chipping, increase the blade back strength and it is necessary to reduce the front corner. The back edge width of the spacing between the B and the blade back C, the desirable B / C = from 0.80 ~~ 0.85 B <C. Taking into account the minimum distance between the holes of chip capacity. High red hardness of high speed steel, blade back B increases will not affect its service life.

(4) High speed steel dies treatment with vacuum hardening. So high-speed steel can play its role. Salt bath temperature heat treatment will produce a decarburized layer and affect the service life of the cutting die. The experiment, durability between the two is a difference of more than 3 times.

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