International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 02 | Feb -2017
www.irjet.net
e-ISSN: 2395 -0056 p-ISSN: 2395-0072
A Review on Modification in Honing Machine Stone Feeding Installation Rohit Lokhande¹, Kiran Mohalkar², Pratik Sarode³, Suhas Magdum4, Prashant choudhary5 123 UG
student , Suman Ramesh Tulsiani Technical Campus-Faculty of Engineering Professor, Dept. of Mechanical Engineering, SRTTC-FOE , Kamshet, Pune-410405 5Deputy manager,SKF india pvt. ltd ---------------------------------------------------------------------***--------------------------------------------------------------------4 Asst.:
Abstract - Honing is one of the super finishing process used
while bearing manufacturing. The inner and outer race of bearing needs to be honed, to obtain a uniform surface endurance strength. The finishing process takes place due to friction between honing tool and workpiece, which results in wearing of tool. Though this wear of tool is insignificant after honing one component, the cumulative tool wear during mass production is considerable. This relatively large wear will result in degradation of surface finish of component being honed. Hence the tool wear needs to be compensated by feeding the tool against workpiece. This feeding might be manual or automatic. In this project work, a mechanism based on ball screw actuator and stepper motor is installed to automate the existing manual feeding. Implementation of this system resulted in reduction in human errors caused by operator as well as increase in the number of bearing rings honed by the honing machine
Key Words: Honing, bearing, surface finish, tool wear, tool wear compensation, ball screw actuator, stepper motor.
1.INTRODUCTION Honing is an abrasive machining process that machines a precision surface on a metal work piece by scrubbing an abrasive stone against it along a controlled path. The honing stones are held against the workpiece with controlled light pressure. It is desired that the honing stones should not leave the work surface. Honing process is primarily used to improve the geometric form of a surface and also improves surface texture. The surface finish has a vital influence on most important functional properties such as fatigue strength, wear resistance, power losses due to friction and corrosion resistance. It is a one type of finishing operation employed not only to produce high finish but also to correct out-of-roundness, axial distortion and taper in workpieces. It is employed very frequently for finishing of bores. There are numerous external surfaces which are honed to obtain required properties or gear teeth, valve seating, races of ball and roller bearings etc. Honing stones also called honing sticks which consists of particles of aluminum oxide, silicon carbide or diamond © 2017, IRJET
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Impact Factor value: 5.181
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bonded together with vitrified clay, cork, carbon, metal or resinoid. The abrasive particles which provide the cutting action must be able to withstand the cutting pressure required for the metal removal. The bond must be strong enough to hold the grit, but it must not be so hard as to rub the workpiece and retard cutting. The porosity of the structure of the stick is depending on the mixture of grit and bond. The method and pressure used in forming the sticks, facilitates chip clearance, thereby minimizing the generation of heat. The size of the grit ranges from 36-600 but the most widely used size ranges in between 120-320. Selection of a particular grit size depends mainly on the desired rate of material removal and the required finish. Coarse grit removes material as fast as possible but result comes out as rougher finish.
2.LITERATURE SURVEY Henry Brunskill was done Real time measurement of wear, in 2015 P.Harper and Roger Lewis using a method called ultrasonic. In the fields of non-destructive testing (NDT) fordetection ,crack thickness monitoring and medical imaging Ultrasonic reflectrometry is commonly used. A sound wave is emitted through the material using a piezoelectric transducer. This sound wave travels through the host medium at a constant speed and then it is partially or fully reflected at an interface. The signal is then amplified and digitized after picked up the reflected wave by the same sensor. If the speed that sound travels through a host medium is known as well as the time this takes, using the speed, distance and time relationship the thickness of the material can be established.Work has concluded that the ultrasonic method is too inaccurate to measure wear due to the errors caused by temperature, vibration and the experimental arrangement. To minimize these errors this body of work looks at methods, particularly the inaccuracies introduced from the change in temperature caused by change of acoustic velocity and the thermal expansion of the material, which can be significant in many applications. In this, a time domain A-scan electric pulse is studied and time of flight is calculated.Thickness of material can be obtained ISO 9001:2008 Certified Journal
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