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The IUP Journal of Mechanical Engineering
An Investigation of Thermal Impact in the Manufacture of a Connecting Rod
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The effect of temperature variation during manufacturing of the connecting rod affects the dimensional quality of the product. The paper presents a case study for the rejection of the lot by the customer. A big lot was rejected by the customer because of the oversize of various parameters. The problem is discussed in detail with the readings of various parameters. The rate of thermal expansion plays a considerable role to have dimensional accuracy at micro level. Two methods are described to overcome the problem. The correction factor is found out by taking various readings of the dimension at various temperatures. Both methods are implemented as per need. The pros and cons are discussed and solutions are suggested.

 
 

The connecting rod of internal combustion engine is one of the most critical components of the mechanism. The connecting rod transmits reciprocating motion of piston into rotary motion of crank shaft. Piston is a reciprocating element; crankshaft is a rotating element, while the connecting rod is an oscillating element of the mechanism. The forging of connecting rod is machined by various machining operations. The atmospheric conditions of the shop floor are also to be considered by quality control engineer to maintain the dimensional quality of various manufacturing operations.

For any material, it is a general rule that it expands as temperature increases, and contracts when temperature reduces. This rule is exceptional for water between temperature limit of 0 C and 4 C. The raw materials for connecting rod do not have such exception. So while manufacturing the connecting rod, as its temperature increases, certain dimensions increase. For manufacturing people, it is the duty to maintain the designed dimension of the connecting rod as per assigned drawing.

 
 

Temperature variation, Dimensional quality, Correction factor, Gauge, Thermal expansion