US 10,537,948 B2Granted

Method and apparatus for shape cutting of a pipe end

OwnerLeo Larikkainventor

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Abstract

The invention relates to a method and apparatus for shape cutting a pipe end. An arched cutter (4) of a punching tool (3, 4) is inserted into an end of a pipe (1) for penetrating the same into a wall of the pipe (1) in a plane of the arched cutter. Then, the punching tool is displaced in a direction perpendicular to a center axis (C) of the pipe (1), whereby the arched cutter (4), while moving outwards from inside the pipe, shears off a piece that matches its shape. The punching tool (3, 4) is withdrawn out of a pipe end, the punching tool is rotated 180°, it is re-inserted into the pipe end and the punching tool (3, 4) is displaced in a direction which is perpendicular to the pipe center axis (C) and opposite to the previous displacement direction, thus enabling the shearing off the pipe end a second piece matching the shape of the arched cutter (4).

Claims8

Dependent claims

A method for shape cutting a pipe end, said method comprising:

cutting two arc-rimmed pieces (2) from the pipe end, wherein performance of the cutting occurs by means of a punching tool (3, 4) having an arc-shaped cutting edge (4) for said cutting;
holding the pipe by a mold (7), the mold having a parting plane enabling opening and two contour arcs consistent with the curvature of the cutting edge, wherein performance of the cutting procedures of the pieces (2) occurs in directions outwardly from within the end of a pipe (1) in two successive cutting phases;
inserting the punching tool (3, 4) into the pipe end by displacing the punching tool co-directionally with a center line (C) of the pipe, while the cutting edge (4) lies in the vicinity of the pipe center line (C);
performing a first cutting phase by displacing the punching tool in a first displacement direction (B1) which is perpendicular to the center line, whereby the cutting edge shears off a first piece against the contour arc present on a first side of the parting plane of the mold (7);
rotating the punching tool 180° around an axis which is parallel with the center line (C) of the pipe, said rotating taking place after the first cutting phase shearing off the first piece;
and performing a second cutting phase by displacing the rotated punching tool perpendicularly relative to the center line (C) in a second displacement direction (B2) opposite to the first displacement direction (B1), whereby the cutting edge shears off a second piece against the contour arc present on a second side of the mold's parting plane.

3 more elements

An apparatus for shape cutting a pipe end, said apparatus comprising a mold (7) for supporting a pipe (1) to be shaped, and a punching tool (3, 4) having a cutting edge (4) which has a curvature consistent with a curvature of a piece (2) to be cut off;

wherein the mold (7) being provided with contour arcs matching the curvature of the cutting edge on either side of a parting plane of the mold;
wherein the punching tool (3, 4) being arranged to be displaced alternatively in two directions (B1, B2) which are opposite to each other and substantially perpendicular to a center line (C) of the mold (7) and the pipe (1), which is supported by the mold (7) in the shape cutting position of the pipe (1);
wherein the punching tool (3, 4) is arranged to be inserted into an end of the pipe (1) by displacing the punching tool (3, 4) in an axial direction (A) of the mold (7) and the pipe (1) supported by the mold (7) in the shape cutting position of the pipe (1);
wherein the punching tool (3, 4) is rotatably disposed relative to the mold (7) around a rotation axis which is parallel with the center line (C) of the mold (7) and the pipe (1);
and wherein the cutting edge (4) is arranged to be rotated around said rotation axis through 180° -between said displacement in two direction (B1, B2).

2 more elements

Dependencies are inferred from the claim text.