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Power Hand Tool means driven by a user’s hand ,with external power’s(electricity ,compressed air or the internal combustion engine ,etc.) help .And group legislature for goods disassemble ,repair ,inspection , adjustment and other operations ,tools used termed .Air Industrial Impact Wrench driven by a pneumatic motor, the internal structure have the Hammer, the Anvil and Camshaft and the like. In this paper, the impact mechanism as discussed. Using Autodesk Inventor to draw Hammer, Anvil and Camshaft ,and to combination it. The researcher used Mathematica software to build, the impact of stroke in hand tools to ensure the V-groove. And use Autodesk Inventor software to construct three-dimensional models. Then, models imported HyperMesh pre-processor were in the process of finite element model mesh, material properties setting, the local coordinate system setting, the boundary conditions setting, scratching mode setting, speed load setting, etc. Finally, by LS-DYNA and LS-PREPOST software of dynamics, the researcher analyzed the moment of impact force scenario between Hammer and Anvix. Since the output torque via the impact from the protruding portion generating torque, the research also will design geometric of the protrusion, and build a standard design criteria from original design. Consider its assembly size, strength of materials, use of the environment and processing methods to construct the design criteria .Import the standard design criteria to design cases to review .Investigate the effects of impact to different types of geometry on the output torque to reasonable solution. By comparison between the various design instantaneous torque, the impact of travel time as well as the impact of impact block unit volume. Can understand torque value and the relevant parameters during the impact . Results for cross comparison. Can be found in the design has its own characteristics. According to the different needs of different occasions. During analysis,a tangent arc can be found to replace the involute geometry.
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