Deep roll peening system and method

Patent metadata

Field	Value
Publication number	US-11673227-B2
Application number	US-202016834078-A
Country	US
Kind code	B2
Filing date	Mar 30, 2020
Priority date	Jun 6, 2016
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

A method for deep roll peening a workpiece includes deep roll peening a workpiece by moving the workpiece along a feed path through multiple groups of opposed rollers that are arranged in series. Each group of opposed rollers includes a rim that defines a workpiece engagement surface that exerts a deep roll peening force on the workpiece. A deep roll peening system includes multiple groups of opposed rollers. Each of the opposed rollers is rotatably mounted and has a rim that defines a workpiece engagement surface. The workpiece engagement surfaces are spaced apart from each other by a gap. The groups are arranged in series such that the gaps define a feed path for receiving a workpiece into serial contact with the workpiece engagement surfaces.

First claim

What is claimed is:

1. A deep roll peened workpiece comprising:
a workpiece body having a leading end, a trailing end, a core region, and rolled surface region, wherein
the rolled surface region is in a state of compressive stress with respect to the core region,
the rolled surface region includes distinct compression bands that are each demarcated by ridges and that are elongated in a lengthwise direction defined from the leading end to the trailing end, and
at least one of the compression bands has a graduated compression stress profile in the lengthwise direction.

2. The deep roll peened workpiece as recited in claim 1 , wherein the graduated compression stress profile initiates at the leading end.

3. The deep roll peened workpiece as recited in claim 2 , wherein, in the lengthwise direction, the graduated compression stress profile is followed by a constant compression stress profile.

4. The deep roll peened workpiece as recited in claim 3 , wherein the graduated compression stress profile continuously increases from the leading end to the constant compression stress profile.

5. The deep roll peened workpiece as recited in claim 1 , wherein the at least one of the compression bands has an asymmetrical compression stress profile in a lateral direction perpendicular to the lengthwise direction.

6. The deep roll peened workpiece as recited in claim 5 , wherein the distinct compression bands define troughs between the ridges and heights from a bottom of the trough to respective tips of the ridges, and the asymmetrical compression stress profile comprises a difference between the heights at opposed lateral locations of the ridges.

7. The deep roll peened workpiece as recited in claim 1 , wherein the workpiece is an airfoil for a gas turbine engine, and the lengthwise direction is an axial direction of the gas turbine engine.

Assignees

• United Technologies Corp
• Raytheon Tech Corp

Inventors

• Kuczek Andrzej Ernest
• Rampone Joseph C
• El-Wardany Tahany Ibrahim
• Faughnan Jr Paul R

Classifications

• B24B39/003 Primary

  the working tool being composed of a plurality of working rolls or balls · CPC title

• B21B13/12

  axes being arranged in different planes · CPC title

• C21D7/08

  by burnishing or the like · CPC title

• B23P9/02

  Treating or finishing by applying pressure, e.g. knurling (B23P9/04 takes precedence) · CPC title