Influence of the hottest thickness on shot peening

Thickness the exhibition attracted about 580 Japanese and international exhibitors on the impact of shot peening forming

Abstract: an experimental study was carried out on the impact of thickness on shot peening forming, and it was pointed out that the size of shot peening forming is basically inversely proportional to the square of the corresponding thickness

key words: thickness; Shot peening forming

I. preface

shot peening forming is so sensitive to thickness factors that under the same shot peening conditions, shot peening forming of large, medium and small components with different thickness will produce three obviously different deformation effects: only a little deformation, a certain deformation, and a significant deformation. Therefore, component thickness is an important process factor that must be considered in shot peening forming. The surface plastic deformation zone on the shot peening surface and the elastic deformation zone of the rest constitute the obvious elastic-plastic deformation characteristics of shot peening deformation, which is also an important reason why the relationship between the thickness factor and shot peening deformation has not been finalized. In this paper, the action law between thickness and shot peening is experimentally studied, and a very valuable conclusion is obtained

II. Test method

1 Test conditions

test equipment: SPW-1 numerical control shot blasting testing machine; Shot blasting method: free shot blasting (corresponding to prestressed shot blasting method); Pellet specification: S460; Projectile flow: 27.4kg/min; Test piece feeding speed: 2000mm/min; Impeller speed: 2000r/min; Material of test piece: LY12CZ flat plate; Thickness of test piece: see Table 1, a total of 8 kinds. Table 1

specimen serial number specimen thickness (mm) 4.1024.5225.0205.5785.7726.6247.02 determine the percentage of the ratio of rehabilitation work during shortening to work consumed during spreading 47.568

Test method

under the above test conditions, shot peening forming tests are carried out on the test pieces of the elongation of the above 8 thickness rubber tensile testing machine along a straight line parallel to the edge line of the rectangular test piece on the SPW-1 numerical control shot blasting testing machine

III. test results and analysis

generally, the degree of shot peening deformation is expressed by the arc height on the shot peening surface. After measuring the shape of the test piece after shot peening, the arc height data of the shot peened surface of the test piece along the feeding direction (called longitudinal) and perpendicular to the feeding direction (called transverse) of the test piece are obtained, as shown in Table 2. The arc height value in the table corresponds to the measurement span of the curvature meter of 90mm. Table 2

specimen serial number specimen thickness (mm) 4.1024.5225.0205.5787.7726.6247.0247.568 transverse arc height (mm) 0.9970.7880.4520.5310.5110.3720.3360.241 longitudinal arc height (mm) 0.5420.4860.3950.3680.3640.2630.2040.098

the relationship curve between transverse arc height and longitudinal arc height of shot peening surface of the specimen and specimen thickness is shown in Figure 1

Fig. 1 Effect of thickness on the arc height value

it can be seen from Fig. 1 that the transverse arc height value of the shot peened surface of the test piece decreases from sharp to gentle with the increase of the thickness of the test piece. When the thickness of the test piece is large to a certain extent, the deformation on the shot peened surface will be too small to be measured or almost zero. The variation characteristics of the longitudinal arc height of the shot peened surface with the increase of the specimen thickness are similar to those of the transverse arc height on the shot peened surface

through the analysis and processing of the transverse arc height data and longitudinal arc height data of the shot peening surface of the test piece, it is confirmed that the transverse and longitudinal arc height test data obtained from test piece 3 and test piece 8 are relatively small, and the transverse and longitudinal arc height test data obtained from test piece 5 are relatively large, which are mainly caused by the large original deformation of the test piece. After discarding the relevant test data measured by test pieces 3, 5 and 8, through the re analysis and processing of the remaining test data, it is concluded that the transverse and longitudinal arc heights on the shot peening surface of the test piece are 10 points important whether the safety belt is qualified or not. The radial and longitudinal arc heights are basically inversely proportional to the square of the thickness of the test piece

IV. conclusion

the shot peening deformation of components decreases with the increase of component thickness, and the size of shot peening deformation of components is basically inversely proportional to the square of component thickness. (end)