US 5,471,730 A · Method for refurbishing worn turret punch press bores

Abstract

A method for restoring worn bores in a turret or other tool punch press is disclosed. The worn turret bore is refurbished by using a special boring bar and drive mechanism to enlarge the diameter of the worn section of the bore. A cylindrical sleeve is inserted into the re-bored bore and secured therein. The internal diameter of the sleeve has been machined to correspond to the unworn internal diameter of the bore. The outside diameter of the sleeve is sized to provide a slipfit with the enlarged diameter of the bore. Axial alignment of the worn turret bore is restored according to the invention by locating the boring bar along an axial centerline of an unworn region of the bore. The unworn region of the bore is the lower portion thereof and is the same diameter and in alignment with bore as originally machined. The boring bar utilizes the unworn portion of the bore as a reference when re-boring the worn portion of the bore.

Claims25

Dependent claims

A method of repairing a worn bore in a turret of a punch press, said method comprising:

detecting an unworn region of the bore in the turret, said unworn region having a centerline;
cutting a worn portion of a sidewall of the bore so that a centerline of said cut portion is generally collinear with said unworn region centerline;
providing a cylindrical sleeve having an outer diameter sized to fit within said cut portion of the bore and an inner diameter approximately equal to a diameter of said unworn region;
inserting said sleeve into the bore;
and
securing said sleeve in the bore and to the turret of the punch press.

3 more elements

A method of repairing a worn bore in a turret of a punch press, said method comprising:

positioning the turret so that the bore is at a tool change station of the punch press away from a punch station;
detecting an unworn region of the bore in the turret, said unworn region having a centerline;
securing a support structure to the turret, said support structure positioning a boring bar with respect to said unworn region centerline, said boring bar having cutting surfaces;
rotating said boring bar;
cutting the bore by translating said rotating boring bar into the bore so that said cutting surfaces cut a worn portion of a sidewall of the bore, a centerline of said cut portion being generally collinear with said unworn region centerline, said cut portion having a larger diameter than said unworn region thereby producing a lip in said sidewall of said bore;
providing a cylindrical sleeve having an outer diameter sized to fit within said cut portion of the bore and an inner diameter approximately equal to a diameter of said unworn region, said sleeve having a flange on an upper edge thereof;
inserting said sleeve into the bore so that a lower edge of said sleeve is spaced from said lip and said flange is juxtapositioned on an upper surface of the turret;
and
securing said sleeve in the bore and to the turret by a fastener inserted through said flange and into said upper surface of the turret.

6 more elements

Dependencies are inferred from the claim text.

Method for refurbishing worn turret punch press bores

Life of this patent

Method for refurbishing worn turret punch press bores

Life of this patent

Abstract

Claims25