Hire Writer Mechanical engineering finds its application in the archives of various ancient and medieval societies throughout mankind. During the years from 7th to 15th century, the era called the Islamic Golden Age, there were remarkable contributions from Muslim inventors in the field of mechanical technology.
For marine engine, the quality of the crankshaft is a decisive factor for its mechanical life. In the manufacturing processes of semi-built-up marine crankshaft, as the final process, finish machining of the entirety is vital to the machining accuracy.
Applying finite element method, the traditional way for fixturing is analyzed and the problem of machining deformation because of poor rigid and great weight is pointed out. In addition, a new fixturing method is put forward according the structure characters of crankshaft, which provides a technical support for practical machining and theoretical principle of fixturing method for extreme manufacturing.
Moreover, a further research direction to increase the fixturing and adjustment efficiency is proposed. This paper analyzes the influence of lubricating oil film of the low-speed and heavy-load sliding bearing on a variety of factors.
It introduces the operation of Bearing for lubricating oil film in monitoring method, common fault causes and treatment measures.
Finally, the bearing cooling system structure is discussed, providing reference for practical engineering application. There are many reasons to cause the failure of the bearing lubrication such as bearing assembly defects, the error of size and cooling system problems. By detecting and contrast parameters, this study analyze the determine data and correct the fault.
Through the use of reasonable structure of the oil tank and cooling water channel, we can improve the lubrication performance, and extend the bearing life. This paper analyzes the factors restricting the low speed and high load sliding bearing lubricant film, and solves the actual bearing lubrication problem.
Several models for calculating the heat transfer coefficient of wheel rims of large capacity steam turbines are presented. Taking a certain MW supercritical turbine rotor as an example, the heat transfer coefficient of wheel rim under cold start-up are analyzed and calculated, according to the and comparison, and the quantitative calculation results are given The results show that the heat transfer coefficient of rotor rims obtained by Sarkar method is close to the heat transfer coefficient obtained by a research institute based on a rib heat transfer model.
In finite element analyses, the calculation results by mentioned method could provide the heat transfer boundary condition of temperature and thermal stress field calculations of supercritical and ultra-supercritical steam turbine rotors.
Steam turbine units are required to start up and shut down as fast as possible to improve economy and load-response ability of the units under the qualification of safety. Thermal stresses in turbine rotor in thermal power plants are the limiting factors for rapid startup, shutdown or load change.
In this paper the online calculation models of temperature and thermal stress for a two-dimensional axis-symmetric object are obtained after disposing of the nonlinear factor such as temperature-dependent properties by a transformation.
The model gained can be used to analyze thermal states in thick-walled components, monitoring and control online. In this paper a lifting device for quickly servicing top beam of the great mining height support on fully mechanized coal mining face is introduced and the technical characteristic,working theory,application effect in mine of the lifting device are expounded.
This lifting device makes the safety and efficiency of supports maintenance improved greatly.
The lifting device occupies small space and has simple structure and doesnt influence the motion and operation of supports. Labor-saving,time-saving ,safe and reliable are also one of the features. This lifting device can be used and the lifter winch be dismantled at any time and needs less maintenance personnel.
The using of this device achieves the goal of senting maintenance personnel or accessories to the working height quickly,safely and accurately and accelerates the development of working face.Manufacturing process of Crankshafts Introduction The crankshaft is located in the engine of a vehicle and converts the force created by the engine's pistons moving up and down into a force that moves the wheels in a circular motion so the car can go forward.
Engineering Materials, Manufacturing and Electrical Machines. The crankshaft is a link between the piston and the drive wheels that is located in the bottom end of the engine.
It holds the huge forces produced by the explosions in the combustion chamber. Let us find you another Essay on topic Manufacturing Materials and Technologies for.
Mechanical engineering is a discipline of engineering that applies the principles of engineering, physics and materials science for analysis, design, manufacturing, and maintenance of mechanical systems.
The material and manufacturing process selection is then carried out based on the intended use.
Essay about Mechanical Engineering Mechanical engineering is a discipline of engineering that applies the principles of engineering, physics and materials science for analysis, design, manufacturing, and maintenance of mechanical systems. Manufacturing process of Crankshafts Introduction The crankshaft is located in the engine of a vehicle and converts the force created by the engine's pistons moving up and down into a force that moves the wheels in a circular motion so the car can go forward. No discussion of high-end crankshaft materials would be complete without mention of the ultra-high-strength alloy known as M (AMS ). This alloy is a modification to the basic chemistry, in which a few more points of carbon are added (higher achievable hardness and strength), along with points of silicon and 7 points of vanadium.
A detailed description is provided in the end about the selected manufacturing route. INTRODUCTION. The crankshaft is the part of an engine which converts reciprocating motion of the pistons into a rotary motion.
Tech Mechanical Engineering, Sardar Patel College of Engineering, India. ABSTRACT: The pedal operated machine has been designed and fabricated for cutting of different metals.
The 12”hacksaw blade (HSS, 12 mm and mm) is used to cut materials like M.S, copper, brass, etc. The material and manufacturing process selection is then carried out based on the intended use.
A detailed description is provided in the end about the selected manufacturing route. INTRODUCTION. The crankshaft is the part of an engine which converts reciprocating motion of .