Cast iron machining assembly platform What precautions should be: a forced vibration is an object subjected to a periodic change of external force such as vibration generated during the grinding process, due to the electric motor, high-speed rotation of the wheels and pulleys and other imbalances. inconsistent thickness or non-triangular belt, oil pump is not working smoothly, will be forced vibration caused by the machine, it will arouse the relative vibration amplitude between the various components of the machine, affect the accuracy of machining the workpiece, such as roughness and cast iron assembly platform roundness rotary motion to the tool or machine made, vibration will affect the rotation accuracy impact on the mechanical properties of the weld metal in which the vibration treatment: To illustrate the effects of vibration treatment of the weld metal mechanical properties of the material, especially the preparation of the three groups welded specimens. materials are 16Mn steel, each sample were middle seam, and the welding process and sample size are the same, Group A without any aging treatment. both retain the original residual stress, vibration group B do aging, cast-iron assembly platform has been tested and shows about 55% of residual stress relief, group C according to JB741-80, specified thermal aging process. After treatment experiments show that the weld material and vibration fatigue limit fatigue limit than the time of untreated improved.