Shot peening apparatus

Details Shot peening apparatus Shot peening apparatus

1981-09-10

1984-02-21

Crosby, Gene

Metal deforming

By shot-blasting

B21J 500

Patent

active

044322208

ABSTRACT:
In apparatus for shot peening, gravity is used to accelerate uniform sized steel shot, and thereby impart a combination of good surface finish and uniform compressive stresses to workpieces. It is especially useful for finishing gas turbine airfoils. Shot is introduced into the peening enclosure (28) through a gate (40) at near zero velocity. It is then accelerated along a streamline (31) toward the workpiece (18) with uniform velocity. The workpiece, positioned along the streamline, can be manipulated in three rotational modes: oscillatory rotation to uniformly peen contoured surfaces of a workpiece, periodic incremental rotation to peen different sides of a workpiece; and, tilting motion to enable peening of shoulders (22). The apparatus is especially suited to peening fragile workpieces such as gas turbine airfoils (18). A diverter plate (44) intercepts the shot stream at times when repositioning of a fragile workpiece is undertaken. Thus, possibly damaging impacts are avoided and steady state operation is able to be promptly resumed.

REFERENCES:
patent: 937180 (1909-10-01), Ridd
patent: 2881506 (1959-04-01), Fuchs
patent: 3019522 (1962-02-01), Bluth
patent: 3423976 (1969-01-01), Burney
patent: 3624967 (1971-12-01), Camper
patent: 3705511 (1972-12-01), Brandel et al.
patent: 4067240 (1978-01-01), Straub
ASM "Shot Peening" Metals Handbook, vol. 2, pp. 398-405 (1964), Amer. Soc. for Metals.
Pangborn Corp. "Shot Peening" (circa. 1961) (Propulsion of Shot Section and Peening Equip. Section).
Brandel, Klass, "Ball Forming Solves . . . Problems", Metal Progress (Mar. 1971).

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