Precautions to be taken before mounting a grinding wheel: In the interest of satisfactory operation and safety, it is important that grinding wheels are mounted correctly on the machine and before mounting they should be examined for any defects. 1. The wheel should be first examined for any flaw or crack which, under stresses set up due to high speed [...]
In this article we will discuss about wheel truing and dressing of a grinding wheel in the industries. Wheel Truing: Wheel truing is defined as act of restoring the cutting face of a grinding wheel by removing the abrasive material from the cutting face and sides of the wheel, so that it will run true with respect to the axis [...]
Abrasive particles used for grinding wheels are of two types viz.: 1. Natural Abrasive and 2. Artificial Abrasive. Generally for most of the purposes, natural abrasives are not used due to certain advantages of artificial (manufactured) abrasive. Natural Abrasives: These are produced by uncontrolled forces of nature. The following are the generally found and used natural abrasives: (a) Sand stone [...]
In this article we will discuss about:- 1. Manufacture of Grinding Wheels 2. Processes of Grinding Wheels 3. Grade 4. Structure 5. Area of Contact. Manufacture of Grinding Wheels: (i) The abrasive particles are first crushed to powder form and passed over magnetic separators for removing iron impurities. (ii) These are then washed with water to remove foreign elements like [...]
The purpose of theory of grinding is to establish relationship between the radial feed, force on individual grits of grinding wheel, velocity of grinding wheel, velocity of work and their diameters. Fig. 20.5 shows a magnified portion of the grinding wheel and work in contact with each other. It will be noted that when an abrasive gain starts to enter [...]
In this article we will discuss about:- 1. Introduction to Grinding 2. Origin of Grinding 3. Cutting Action in Grinding 4. Mechanics of Cutting Action in Grinding 5. Temperature in Grinding 6. Self-Sharpening Characteristics of Grinding Wheel 7. Residual Stresses in Grinding 8. Causes of Wheel's Wearing too Rapidly 9. Causes of Wheel's Glazing 10. Operating Conditions and Other Details. [...]
In this article we will discuss about the factors to be considered while selecting grinding wheels. Selection of Grinding Wheels: The proper selection of grinding wheels is very important for getting good results (i.e. obtaining better finish and at the same time having more life of the wheel). In order to meet all these requirements, the various elements that influence [...]
Grinding ratio is the quick method of evaluating the grinding wheel performance. Grinding operation removes metal very delicately, leaving a finished surface of superior dimensional accuracy and good surface texture. If it is carried out properly, there will be very less metallurgical damage due to the rise of pressure and temperature of the material being ground. Comparing with any other [...]
Basically there are three different methods by which centreless grinding can be done on different types of jobs. Method # 1. Through-Feed: This is simplest method and is applied only to plain parallel parts such as roller pins and straight long bars which are difficult to grind by ordinary cylindrical grinding method. In this case, controlling wheel is first positioned [...]