Method and device for cutting pipe lengths
OwnerLudwig Balintinventor
Life of this patent
Estimating the term…
Abstract
A method of cutting a piece of pipe from a length of pipe in a cutting plane by gripping the length of pipe directly adjacent the cutting plane and displacing the piece of pipe with respect to the length of pipe in the cutting plane, comprises applying a radially outwardly directed and a radially inwardly directed pressure against the length of pipe and the piece of pipe in the cutting plane and at both sides thereof, simultaneously applying an axial pressure, the pressures generating a stress amounting to at least 70% of the yield point of the material of the pipe, and maintaining the pressures during the entire cutting operation. A device for carrying out this method is also disclosed.
Claims8
A method of cutting a piece of pipe from a length of pipe in a cutting plane by gripping the length of pipe directly adjacent the cutting plane and displacing the piece of pipe with respect to the length of pipe in the cutting plane, which comprises the steps of
- (a) applying a radially outwardly directed and a radially inwardly directed pressure against the length of pipe and the piece of pipe in the cutting plane and at both sides thereof,
- (b) simultaneously applying an axial pressure, the pressures generating a stress amounting to at least 70% of the yield point of the material of the pipe, and
- (c) maintaining the pressures during the entire cutting operation.
A device for cutting a piece of pipe from a length of pipe in a cutting plane by gripping the length of pipe directly adjacent the cutting plane and displacing the piece of pipe with respect to the length of pipe in the cutting plane, which comprises
- (a) two cooperating cutters defining a bore in the cutting plane for receiving the length of pipe and surrounding the same, the bore having a diameter providing a force fit for the length of pipe, the cutters abutting each other in the cutting plane,
- (1) one of the cutters being rotatable with respect to the other cutter about an axis of rotation spaced from the center of the bore in said one cutter,
- (b) a support for the one cutter,
- (c) an axially displaceable two-part mandrel, one mandrel part being arranged on the support,
- (1) the mandrel parts having end faces facing each other in an abutment plane and convex surfaces fitting into the length of pipe, the end faces defining sharp edges with the convex surfaces in the abutment plane, and the end faces having a cross section in said abutment plane providing a tight force fit with the interior cross section of the length of pipe for applying a high radially outwardly directed pressure thereupon upon rotation of the one cutter with respect to the other cutter,
- (d) a drive for axially displacing the two-part mandrel until the abutment plane is coplanar with the cutting plane,
- (e) a stop for axially holding the length of pipe in position, and
- (f) a feeding drive for axially displacing the pipe towards the cutting plane and said top, respectively .
Dependencies are inferred from the claim text.