Basic Curves Of Surface Finish After Glass Bead Peening

Author:  Balcar, G.P. and Maltby, F.C.
Source:  Conf Proc: ICSP-1, (p.295-302)
Doc ID:  1981010
Year of Publication:  1981
Surface finish is of growing importance in shot peening operations. This paper presents data on the peening of metal surfaces of three hardnesses with different sizes of glass beads at three specific nozzle angles. The conclusions are that when arc height peening intensity is kept constant, (1) shallower nozzle angles produce a rougher surface texture (higher RMS value), and (2) in general, peening with smaller beads produces a smoother surface texture (lower RMS value). Also, when higher arc height peening intensities are used, rougher surface textures are produced at all nozzle angles. Data is presented for aluminum and stainless steel surfaces with Rockwell hardness values of 75RB, 80RB, and 89RB, showing the relationships between arc height peening intensities, surface texture and nozzle angle. Recommendations are made for proper use of Almen arc height to control parameters of cleaning, finishing and deburring applications, as well as shot peening. Descriptors: Shot peening; Surface finish (texture); Arc height peening intensity; Glass beads; Depth of compression; Almen test strips; Speed of cleaning; Coverage; Glass bead consumption

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