Pipe cutting tool (1) comprising a stationary knife (12) fixed in a first plane to a frame (11), and a translatable knife (14) which can be slidably moved along knife translation paths (113) arranged in a second plane of said frame (11), wherein the knives (12, 14) and the frame (11) delimit a central frame aperture (114), as the frame aperture (114) forms a passageway for a pipe (2) to be cut, the translatable knife (14) being arranged diametrically opposite the stationary knife (12), the knives (12, 14) having curved knives edges (121, 141) with a curvature smaller or equal to a nearby section of an inner pipe wall (24) of the pipe (2) to be cut, each of the knives (12, 14) covering a sector of up to 180, each of the curved knives edges (121, 141) being limited by lateral edges (123, 143) having a direction deviating from adjacent sections of the curved knives edges (121, 141), and the translatable knife (14) is connected to the frame (11) via e linear actuator system (16).

Pipe cutting tool (1) comprising a stationary knife (12) fixed in a first plane to a frame (11), and a translatable knife (14) which can be slidably moved along knife translation paths (113) arranged in a second plane of said frame (11), wherein the knives (12, 14) and the frame (11) delimit a central frame aperture (114), as the frame aperture (114) forms a passageway for a pipe (2) to be cut, the translatable knife (14) being arranged diametrically opposite the stationary knife (12), the knives (12, 14) having curved knives edges (121, 141) with a curvature smaller or equal to a nearby section of an inner pipe wall (24) of the pipe (2) to be cut, each of the knives (12, 14) covering a sector of up to 180, each of the curved knives edges (121, 141) being limited by lateral edges (123, 143) having a direction deviating from adjacent sections of the curved knives edges (121, 141), and the translatable knife (14) is connected to the frame (11) via e linear actuator system (16).

A portable plasma cutting apparatus for coping and cutting pre-bend tubular members includes a control unit, a control arm, a first step motor, a second step motor, a linear drive mechanism, a rotary drive mechanism, a plasma cutter, a tube placement deck, and a platform. The control arm is operatively coupled with the first step motor by the rotary drive mechanism to rotationally drive the control arm around a rotational axis. The control arm is operatively coupled with the second step motor by the linear drive mechanism to linearly drive the control arm along the rotational axis. A torch of the plasma cutter is terminally mounted to the control arm and positioned in between the control unit and the tube placement deck as the control arm rotationally and linearly moves about the control unit. The platform provides the sufficient height for the portable plasma cutting apparatus.

A portable plasma cutting apparatus for coping and cutting pre-bend tubular members includes a control unit, a control arm, a first step motor, a second step motor, a linear drive mechanism, a rotary drive mechanism, a plasma cutter, a tube placement deck, and a platform. The control arm is operatively coupled with the first step motor by the rotary drive mechanism to rotationally drive the control arm around a rotational axis. The control arm is operatively coupled with the second step motor by the linear drive mechanism to linearly drive the control arm along the rotational axis. A torch of the plasma cutter is terminally mounted to the control arm and positioned in between the control unit and the tube placement deck as the control arm rotationally and linearly moves about the control unit. The platform provides the sufficient height for the portable plasma cutting apparatus.

A method for manufacturing an annular member includes: a cylindrical member forming step of forming a cylindrical member with an annular shape from a round bar material; and a cutting and separating step of cutting and separating the cylindrical member over an axial direction of the cylindrical member while rotating the cylindrical member, the cylindrical member being cut and separated by a shear force obtained by restraining molds, which apply an urging force to an outer circumferential surface of the cylindrical member, and by a restraining mold, which is provided with a gap on the outer circumferential surface of the cylindrical member, among a plurality of restraining molds provided on an inner circumferential surface side and an outer circumferential surface side of the cylindrical member along the axial direction, to obtain a plurality of annular members.

A method for manufacturing an annular member includes: a cylindrical member forming step of forming a cylindrical member with an annular shape from a round bar material; and a cutting and separating step of cutting and separating the cylindrical member over an axial direction of the cylindrical member while rotating the cylindrical member, the cylindrical member being cut and separated by a shear force obtained by restraining molds, which apply an urging force to an outer circumferential surface of the cylindrical member, and by a restraining mold, which is provided with a gap on the outer circumferential surface of the cylindrical member, among a plurality of restraining molds provided on an inner circumferential surface side and an outer circumferential surface side of the cylindrical member along the axial direction, to obtain a plurality of annular members.

A pipe cutting machine, which includes a hole-type movable cutting die (6b), which is driven by a drive lever (7), by means of which circular movements with a continuously variable stroke (h) can be performed, an eccentrically shaped crank pin bearing (26) in an outer shaft (18), in which a crank pin (11), which is arranged eccentrically on a crank pin drive (23), is movably supported in relation to the outer shaft (18), the crank pin (11) being in operative connection with the drive lever (7).

A pipe cutter with gauge and reamer/beveller of the cut edges of pipe. On the body of the pipe cutter there is at least one gauge; between it and the body a cavity is delimited capable of accepting the end of a pipe (t); each gauge having on its end a mouth that varies its diameter between a minimum (d1) at its base and a maximum (d) that coincides with the gauge of the pipe (t) it accepts. There is also at least one blade on each existing gauge or on a beveller equipped with one or several portions (S) with at least one blade on each of them. A pipe (t) is inserted in the corresponding gauge, first gauging the diameter of its cut edge and then the blades simultaneously bevel and ream the cut pipe (t) edge.

To provide a pipe cutting machine capable of cutting a pipe even of a large diameter efficiently in a short period of time, and achieving excellent economical efficiency and excellent durability with a simple, compact, and light-weight configuration.

A pipe cutting machine cuts a pipe 10 at a right angle to the center line of the pipe 10. The pipe cutting machine comprises: rotary blades 20, 20 in a pair, with a plane at a right angle to the center line of the pipe 10 to be cut defined as an x-y plane and the center of the pipe 10 defined as a coordinate origin, the rotary blades being arranged to face each other on both sides of a y axis in such a manner that blade edges of the rotary blades 20, 20 overlap each other in the direction of an x axis; a straightforward driving mechanism 50 that drives the rotary blades 20, 20 in a pair straightforward in opposite directions of a y-axis direction so as to make the rotary blades 20, 20 in a pair pass each other on the x axis and in the vicinity of the x axis; and a power direction conversion mechanism 46 and a power direction conversion mechanism 47 that change part of straightforward driving force in the y-axis direction to force in the x-axis direction and move the rotary blades 20, 20 in a pair outwardly to get farther from the y axis for avoiding interference between the blade edges when the rotary blades 20, 20 in a pair pass each other on the x axis and in the vicinity of the x axis.

To provide a pipe cutting machine capable of cutting a pipe even of a large diameter efficiently in a short period of time, and achieving excellent economical efficiency and excellent durability with a simple, compact, and light-weight configuration.

A pipe cutting machine cuts a pipe 10 at a right angle to the center line of the pipe 10. The pipe cutting machine comprises: rotary blades 20, 20 in a pair, with a plane at a right angle to the center line of the pipe 10 to be cut defined as an x-y plane and the center of the pipe 10 defined as a coordinate origin, the rotary blades being arranged to face each other on both sides of a y axis in such a manner that blade edges of the rotary blades 20, 20 overlap each other in the direction of an x axis; a straightforward driving mechanism 50 that drives the rotary blades 20, 20 in a pair straightforward in opposite directions of a y-axis direction so as to make the rotary blades 20, 20 in a pair pass each other on the x axis and in the vicinity of the x axis; and a power direction conversion mechanism 46 and a power direction conversion mechanism 47 that change part of straightforward driving force in the y-axis direction to force in the x-axis direction and move the rotary blades 20, 20 in a pair outwardly to get farther from the y axis for avoiding interference between the blade edges when the rotary blades 20, 20 in a pair pass each other on the x axis and in the vicinity of the x axis.