Showing papers on "Peening published in 1975"

Method of inspecting shot peened surfaces for extent of coverage

Abstract: The method of inspecting shot peened surfaces of a workpiece for the extent of coverage comprises coating the surface to be peened of a workpiece with a material containing a fluorescent dye and then shot peening the part to be peened until the amount of fluorescent coating remaining, as indicated by the amount of fluorescent radiation given off when exposed to ultraviolet light, compares with the amount of fluorescent radiation given off from a previously prepared control specimen which has the same material characteristics as the workpiece and was coated with the same fluorescent material and shot peened to a desired coverage.

Zircon sand impacting material

Abstract: The treatment of hard surfaces by impacts of fine hard granules continually bombarded against them, as for peening, brightening, texturizing, compacting, reforming and/or cleaning adhesions from plates and other articles of steel, aluminum, or hard plastics, is accomplished with extraordinary effectiveness, yet with minimal loss of the blasting material due to breakdown, by providing and utilizing for the treatments selectively sized fractions having grain sizes limited to the ranges of -100/+200 mesh, -100/+140 mesh, -140/+200 mesh and -200/+325 mesh grain sizes, of the rounded oblong grains, having a specific gravity of about 4.7, of a mass of refined zircon sand.

Deburring device with oppositely acting deburring elements

Abstract: Opposite side portions of an edge of a workpiece of sheet material are peened to smoothness by two peening tools oppositely acting upon said side portions through coaction with a rotary hammer resiliently carried within a housing. A first one of said tools is vibratorily actuated directly by said hammer to peen one of said side edge portions while the other of said tools is actuated indirectly by said hammer through vibratory reaction of the latter to its direct actuation of the first tool which reaction is effective through said housing and a rigid stem of the housing which supports said other tool.

Device for the determination of biaxial‐symmetrical residual stresses in metallic, disk‐shaped specimens

Abstract: A device is described for the determination of the residual stresses in metallic disks up to 3 mm thickness due to axi‐symmetric surface treatments on both faces. The apparatus is designed to measure normal stresses at any point on planes orthogonal to the disk in the cases, normally occurring in practice, of compressive internal stresses on carburized, nitrided, chromed, peened, etc., surfaces. The method consists of the electrochemical thinning of the disk, making the sample act as a rotating anode in a special electrolytic cell with floating cathode. During the operation, the spontaneous deformations of the disk are carefully compensated for by use of an annular bending load which guarantees a sufficient planarity of the outer surface of the disk. The electrolytic cell develops a plane attack front only on the internal surface; parallelism between the two faces is assured by accurate mechanical seating. The determination of the stress field is carried out by relating the bending of the disk, or the values of the counter‐bending load applied to compensate for this bending with the unknown internal stresses. Two analytical treatments are thus developed, each of which is able to provide a measure of the internal stresses starting from experimental data which are different, but which are obtained in the course of the same test and are able to provide a check.