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US3695091A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of and apparatus for measuring intensity of peening in small diameter holes

Assignee: Metal Improvement Co LLC
•
Filing: 1970-09-28
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Granted: 1972-10-03
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Expires: 1990-09-28
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Abstract

Abstract The method of measuring intensity of peening in the Almen scale of small diameter holes, such as 0.5 inch or less, consists of a first step of plotting an intensity curve on a reference graph, which intensity curve is proportional to but a fraction of the Almen scale. The intensity curve is plotted by peening, under a predetermined intensity, a number of Almen strips which have been masked to expose only portions of each of the strips so that each strip has an exposed portion differing in width from the others in equal increments of linear measurement and, then, measuring the curvature of each peened strip. Thereafter, peening a portion of an Almen strip which overlies at least one arcuate groove which has chordal dimension equal to the smallest unit width employed to produce the reference graph. After peening the Almen strip in which the same peening apparatus and technique used to peen the holes of the production pieces is utilized, the curvature of the strip is measured. The measurement is plotted on the reference graph to obtain an Almen scale measurement of the peening intensity. If the measurement is for a hole size outside of the intensity curve, the measurement is then extrapolated by using the reference graph to achieve an Almen scale measurement. This Almen value then can be compared with the Almen scale peening intensity called for to insure that the peening meets that requirement and continues to meet the Almen intensity during production peening.

Inventors

  • 👤 Glenn D Smith

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 12:43
CPC Classifications
B; B24; B24C; B24C3/00; B24C3/32; B24C3/325; B24C1/00; B24C1/10; G; G01; G01N; G01N3/00; G01N3/32; G01N3/34; G01N2203/00; G01N2203/02; G01N2203/022; G01N2203/0248; G01N2203/06; G01N2203/0664

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 20 words
The apparatus of claim 1 wherein a plurality of closely spaced parallel grooves are provided in said strip holding surface.
Claim 2
Dependent Claim 24 words
The apparatus of claim 1 wherein said strip holding surface is rectangular and the groove extends parallel to the short sides of the surface.
Claim 3
Dependent Claim 17 words
The apparatus of claim 1 wherein said means comprises a retaining plate secured to the body portion.
Claim 4
Dependent Claim 50 words
The apparatus of claim 4 wherein said retaining plate has a recess in its surface adjacent the body portion which recess is dimensioned so the bottom surface of the recess abuts the top surface of the Almen strip and is out of contact with the edges of the Almen strip.
Claim 5
Independent Claim 241 words
A method of measuring in the Almen scale the intensity of peening of the surfaces of small diameter holes in production workpieces comprising the steps of: a. masking various first Almen strips to expose portions of each of the strips so that each strip has an exposed portion differing in width from the exposed portions of the other masked strips in equal increments of linear measurement; b. peening under a predetermined intensity each of the exposed surfaces of the various first Almen strips, and then measuring the curvature of deformation of each of the peened first Almen strips; c. plot the deformation measurements on a graph to obtain a reference peening intensity curve proportional to and a fraction of the Almen scale; d. forming at least one arcuate groove in the surface of a holding block of the size of an Almen holding block which groove has a chordal dimension equal to the smallest unit width employed to plot the reference peening intensity curve; e. disposing a second Almen strip on said holding block to overlie said arcuate groove; f. thereafter peening the surface of the second strip overlying said groove with the same peening apparatus and technique used to peen the holes in the production workpieces; g. measuring the curvature deformation of the second strip; and h. Comparing this deformation measurement of the second strip with the reference peening intensity curve by plotting the deformation measurement on the reference graph.
Claim 6
Dependent Claim 61 words
The method of claim 6 wherein the peening of the second Almen strip is achieved by inserting the peening shot discharge device of the peening apparatus in the space defined by the arcuate groove and the second Almen strip so that the rain of shot impacts against the surface of the groove and the inner surface of the second Almen strip.
Claim 7
Dependent Claim 21 words
The method of claim 6 wherein said groove is made with a chordal dimension of 0.1 of an inch or less.
Claim 8
Dependent Claim 23 words
The method of claim 8 wherein the width of exposed first Almen strips change in equal linear measurement by 0.1 of an inch.
Claim 9
Dependent Claim 24 words
The method of claim 8 wherein the first Almen strips are masked to provide a smallest exposed surface of a width of 0.1 inch.
Claim 10
Dependent Claim 29 words
The method of claim 6 wherein said groove is made with a chordal dimension of 0.1 of an inch or less and a length about 0.75 inch or less.
Claim 11
Dependent Claim 28 words
The method of claim 6 wherein said first Almen strips are masked so that the exposed surfaces extend transversely of the longitudinal axes of the first Almen strips.
Claim 12
Dependent Claim 37 words
The method of claim 6 wherein a plurality of arcuate grooves are formed in the surface of the holding block and wherein each of the exposed surfaces of the second Almen strip overlying the grooves are peened.
Claim 13
Dependent Claim 39 words
The method of claim 6 wherein extrapolation of the deformation of the second Almen strip is employed to provide an Almen scale measurement when the deformation measurement of the second Almen strip is outside the reference peening intensity curve.

References Cited (Backward Citations)

US2350440A Cited
US2607213A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-10-03 1976-04-03 1976-10-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-10-03 1980-04-03 1980-10-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-10-03 1984-04-03 1984-10-03 $7700.00 Window Closed / Lapsed

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