Importance

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Abstract

A pipe end cutting apparatus for processing pipes without variations in the angle of bevel and the root face thickness due to changes in the diameter of the pipes. There are provided a pipe clamping device for clamping the inside of a pipe, a rotary driving unit supported on the pipe clamping device, a feed unit for moving the rotary driving unit in the axial direction, and a control unit for controlling the rotary driving unit to rotate concentrically with the pipe. Processing tools for cutting the pipe end are mounted on the rotary driving unit through parallelogram links in such a manner that the processing tools are each caused to make a parallel movement in the radial direction of the pipe, while maintaining its cutting angle at a given angle with respect to the pipe end. When a pipe of any other type having a different diameter is to be beveled, processing tool holders can be moved in the radial direction of the pipe so that the processing tools make a parallel movement, and the cutting edges of the processing tools also make a parallel movement thus maintaining the angle of the cutting edges unchanged with respect to the axis of pipes to be beveled. The ends of pipes are processed to provide the predetermined angle of bevel and root face thickness unless the position of the rotary driving unit in the pipe axial direction is changed.

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First Claim