Abstract: In order to compare the magnitude of residual compressive stress in links caused by the rolling throw ing pills machine and the hanging throwing pills machine, the residual stresses were measured using strain gauge rosette by the drilling method. The result shows that shot peening can be used to cause residual compressive stress effectively, and that the residual compressive stress caused by the hanging throwing pills machine is higher than that caused by the rolling throwing pills machine. The cause of residual stress errors was also discussed.

Key words: esidual stress, drilling me山od, shot peening