Piercing mandrel having an improved service life for producing seamless tubes
A technology of seamless pipes and punches, applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of increasing service life, unable to cool the top of punches, complex production process, etc.
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[0032] figure 1 A conical piercing mill is shown. This conical piercing mill utilizes the punch of the present invention to form a solid block of steel into a hollow block tube. The conical piercing mill 1 comprises two work rolls 2, 2'. These two work rolls form the solid block 3 into a hollow block tube 6 with internal tooling. The internal tools include the punch 4 and mandrel 5 of the present invention. In the opposite direction to the direction of rotation of the work rolls 2, 2', the solid block 3 or hollow block tube 6 is moved in a helical fashion by axially fixed internal tools.
[0033] According to the invention, the punch 4 comprises a punch body 4.1 to which a punch nose 4.2 is connected. The diameter of the punch body 4.1 increases continuously from the nose side to a maximum value which determines the inner diameter of the hollow block tube 6 . According to the invention, the punch nose 4.2 has a diameter that decreases conically towards the punch body 4.1....
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