US 5,894,771 A · Pipe cutting machine and process for cutting pipe pieces from a pipe blank

Abstract

Process and arrangement for cutting and/or chamfering pipe front rims of pipes, in particular thick-walled pipes which are used for manufacturing ball bearings. The process includes the steps of measuring the actual external diameter of the pipe or inputting the data of the nominal external diameter of the pipe, moving of at least one cutting head towards abutting contact with the exterior surface of the pipe in a rapid transverse motion in accordance with measurements stored in a control unit, switching the feed motion and/or the cutting speed to conform to the machining process which has been adapted to the material of the pipe for the rapid cutting of a ring piece from the pipe blank. The external periphery of the pipe generally consisting of a hard zone which is being cut by a slower cutting speed and said cutting speed is increased once said hard zone has been fully traversed by the cutting tools mounted on the cutting head.

Claims18

Dependent claims

A process for cutting and optionally chamfering pipe pieces from thick-walled pipe blanks for manufacturing ball bearings from pipe pieces which have been cut from said pipe blanks, wherein each one of said pipe blanks has an actual external diameter, a nominal external diameter, a hard zone at least in the region of the outer periphery of each pipe blank, and each pipe blank is being moved at a predetermined feed advancing speed and cut a preselected cutting speed, comprising the following steps:

a) measuring the actual external diameter of the pipe blank adjacent to the location of the cut or inputting of the nominal external diameter of the pipe blank;
b) moving a cutting tool in close proximity to the outer periphery of the pipe blank in a first rapid operational mode;
c) switching the feed advance or the cutting speed from a first operational mode to a second operational mode which is adapted to a rapid cutting operation of the pipe blank;
and
d) including the following additional process step after the first operational mode and before the second operational mode:
switching the feed advancing speed or cutting speed to a lower speed than the speed of said first operational mode.

3 more elements

A process for cutting and optionally chamfering pipe pieces from thick-walled pipe blanks for manufacturing ball bearings from pipe pieces which have been cut from said pipe blanks, wherein each one of said pipe blanks has an external diameter, a nominal external diameter, a hard zone at least in the region of the outher periphery of each pipe blank, and each pipe blank is being moved at a predetermined feed advancing speed and cut at a preselected cutting speed, comprising the following steps:

a) measuring the actual external diameter of the pipe blank adjacent to the location of the cut or inputting of the nominal external diameter of the pipe blank;
b) moving a cutting tool in close proximity to the outer periphery of the pipe blank in a first rapid operational mode;
c) switching the feed advance and the cutting speed from a first operational mode to a second operational mode which is adapted to a rapid cutting operation of the pipe blank;
and
d) including the following additional process step after the first operational mode and before the second operational mode:
switching the feed advancing speed and the cutting speed to a lower speed than the speed of said first operational mode.

3 more elements

Dependencies are inferred from the claim text.

Pipe cutting machine and process for cutting pipe pieces from a pipe blank

Life of this patent

Pipe cutting machine and process for cutting pipe pieces from a pipe blank

Life of this patent

Abstract

Claims18