International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 07 Issue: 08 | Aug 2020
p-ISSN: 2395-0072
www.irjet.net
Failure Analysis of Power Press Crankshaft Satish A. Patel1, H. G. Patil2 1Research
Scholar, 2Associate Professor of Mechanical Engineering 1,2D.N. Patel College of Engineering Shahada, Maharashtra, India ---------------------------------------------------------------------***---------------------------------------------------------------------1,2Department
Abstract - Crank shaft is a critical component in n power press industry. Because of impact load continuously acting on it, crank shaft of a press machine always experiences continuous shear stress and over loading. Press machine continuously deals with stress and because of that crank fails in machine under uneven conditions, which leads to complete shutdown of machine. So, as crank is a critical part of power press, it must be designed after carefully considering all the factors responsible for its failure. This paper is focused on finding the failure of crankshaft in industry. It consists of creating a 3-D model of crankshaft in Solidworks software and performing Static and Fatigue Analysis in Ansys Workbench 15.0 applying the boundary conditions and forces. The result obtained from the Ansys analysis is validated using the analytical method. It is based on the obtained results redesign the crankshaft.
speeds required by modern machinery. Crankshaft is an important part of Power press machine. They need to be rigid, with high torsional strength, be able to withstand forces and, without compromise, need to be compact.
.
Key Words: Power press machine, Solidworks, Static analysis, FEM.
Crankshaft,
1. INTRODUCTION
Fig -1: Crankshaft
Crankshaft is a large component with a complex geometry in the Power Press, which converts the rotary motion of motor into the reciprocating motion of the Ram with a connecting rod link mechanism. Al-Jazari was the first engineer to invent the crankshaft, which is considered the single most important invention after the wheel. This system is used to transform linear motion into rotating motion, and vice versa, and is central to the modern machinery such as internal combustion engines and Power press. Since the crankshaft experiences a large number of load cycles during its service life, fatigue performance and durability of the components have to be considered in the design process. Design developments have always been an important issue in the crankshaft production industry, in order to manufacture a less expensive component with the minimum weight possible and proper fatigue strength and other functional requirements. The crankshaft must be strong enough to take the downward force during downward stroke without excessive bending. Crankshafts have altered very little in their basic design since the very first steam reciprocating engines were put into ships during the nineteenth century. What has been changed is the material and level of design and engineering to ensure that crankshaft can cope with the high powers and © 2020, IRJET
|
Impact Factor value: 7.529
|
As shown in figure.1 above, a crankshaft has three main components; 1. A crank pin journal or “big end” (the running surface of the shaft) which receives the energy 2. A main journal which carries the crankshaft within the main bearings. 3. The crank webs, which connect the two journals together 2. TYPES OF FAILURES IN CRANKSHAFT Crankshaft journals (being running surfaces) are hardened. The hardness layer is thin and is essential to prevent wear to the crankshaft itself; the hardness level has manufacturers’ recommended limitations for polishing and machining. A journal with defects beyond the hardness layer limitations will require replacement or expensive repairs. The hardness layer can also be affected by overheating, resulting in the surface becoming excessively hard. Taking all the above into consideration, it hardly seems surprising that these components, which are complex by design and receive so many varied forces are subject to failure. The most common types of failure are:
ISO 9001:2008 Certified Journal
|
Page 4467