“Analysis of Connecting rod using Reverse Engineering method and modify the design using polynomial curve.”

Production Engineering

Connecting rod is the most important part in the automobile sector it forms the link between piston and crankshaft. It is mostly used for the conversion of the reciprocation motion to rotary motion. Connecting rod receives the forces from the piston which are continuously varying in nature so stress on the connecting rod is continuously varying. So the design of the connecting rod is the most important criteria. The design changes of the connecting rod is not economical, because todays connecting rod is having cross section of I and the I cross section is having the largest load carrying capacity per unit weight of the connecting rod so the cross section change is not possible so only the corner radius of the connecting rod would be the option for the change without much more stress concentration. The shape of the connecting rod is complicated so to generate the geometry of the connecting rod in any modeling software use of reverse engineering technique is essential. By using reverse engineering method scan the connecting rod which having complicated geometry so that we can easily import that geometry to create model. This model is used for the analysis purpose. The existing model of the connecting rod is takes various dynamic load so the connecting rod design is the critical criteria for the stress reduction in the connecting rod at the various corner point of the connecting rod like at the big end of the connecting rod sudden changes in geometry takes place. The current investigation of the connecting rod model shows that the sudden change of the geometry of the connecting rod is design with the help of Bezier curve; the Bezier curve is the smooth curve of degree which is one less than the number of control point of the Bezier curve; and find out the result of the final connecting rod which having curvature with the Bezier curve. The connecting rod design with the help of Bezier curve having less stress concentration as compare with the connecting rod which is design with the nominal curve.

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