Stretching core head for hollow metal pipe

Abstract

The present invention discloses a hollow metal pipe drawing core print comprising a section with fixed diameter and an outlet chamfer section equipped on one side of the section with fixed diameter; the other side of the diameter-fixed section is equipped with a deformed section tilted upwards. The hollow metal pipe drawing core print boasts of excellent lubricating performance which can reduce the friction between the drawn hollow metal pipe and the deformed section of the drawing core print and further reduce the resistance taken by the core print to ensure the size precision of the drawn metal pipe and the quality of the external surface of the drawn metal pipe; in addition, the service life of the drawing core print and the drawing processing efficiency can be increased; the present invention can be used in a wider range; the present invention can be used not only in straightening production of the hollow metal pipe but also in coiling production of the hollow metal pipe.

Description

technical field [0001] The invention relates to a drawing tool for hollow metal pipes, in particular to a drawing core head for hollow metal pipes. Background technique [0002] The drawing core head of the traditional hollow metal pipe includes a cylindrical sizing section, a conical deformation section and an outlet chamfering section arranged on both sides of it, the height of the deformation section is lower than the sizing section, and the deformation section slope down. The shortcoming of the drawing mandrel head of this hollow metal pipe is: when the drawing mandrel head of this hollow metal pipe material is stretched, the frictional force between the drawn hollow metal pipe material and the deformation section of the drawing mandrel head is large, The amount of lubricating oil consumed is large, so that the deformation section and the sizing section cannot be fully lubricated, resulting in unstable dimensional accuracy of the drawn hollow metal pipe, and poor qualit...

AI Technical Summary

Problems solved by technology

The shortcoming of the drawing mandrel head of this hollow metal pipe is: when the drawing mandrel head of this hollow metal pipe material is stretched, the frictional force between the drawn hollow metal pipe material and the deformation section of the drawing mandrel head is large, The amount of lubricating oil consumed is large, so that the deformation section and the sizing section cannot be fully lubricated, resulting in unstable dimensional accuracy of the drawn hollow metal pipe, and poor quality of the inner and outer surfaces, due to the greater resistance borne by the stretching core , the drawing core head is often broken, resulting in the scrapping of the drawing die, and the pass processing rate is low, the function is single, and it can only be used for the direct drawing production of hollow metal pipes

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