Grinding wheels, Mechanical Engineering

Grinding Wheels

Implicated to be rotated at relatively high rotational velocities within grinding machines, grinding wheels contain a surface of rotation about a central axis. They are made through first thoroughly mixing proper-sized grains of the needed abrasive along with a bonding material. The bonding material must thoroughly coat the surfaces of each grain. This mixture is pressed, or else formed, in molds to the preferred size and shape. After drawing such shapes from the mold, the bonding material should be hardened via heating or via other means. The central hole of a grinding wheel that fits an arbor is bushed via pouring molten lead in the hole around a removable metal core. The grinding wheel after that may be mounted and rotated about its axis for truing its surface along with a diamond cutting tool. Truing cuts a minute amount of material from a surface of a grinding wheel hence it will become concentric along with the axis of rotation.

Grinding wheels are made along with inorganic bonds as vitrified or silicate, or organic bonds as resenoid, rubber or shellac. Vitrified wheels which employ ceramic porcelain like binder are most usually used. These wheels can perform all kinds of grinding and microfinishing operations. Another binder includes refractory clay, talc and feldspar etc. Their high strength is attained because of firing at high temperatures. They are conversely brittle and thus cannot be made long and thin. Resenoid wheels are stronger and flexible. Thin wheels of large diameter contain this bond. However, Resenoid bonded wheels, wear fast, and destroy in alkaline fluids and the bonds burn at temperature above 300oC. Rubber bonded wheels are flexible and strong and can be employed for slitting operations, and centreless grinding. They get worse at temperature above 150oC.

A grinding wheel must be marked to offer the following information as: abrasive utilized, abrasive grain size, bonding material utilized, structure, which implies how closely the abrasive grains along with their bond coatings are packed together, and grade that implies, in the grinding wheel how strongly the abrasive grains are held. The bonding material ordinarily doesn't occupy all of the space in between the grains, because it merely coats the grains. Hence, grains are held together at points of contact among the bond coatings. Grinding wheels are depending on their structure, porous to varying degrees. Open spaces among the grains assist to provide room for chips and to carry cutting fluid to the region where the cutting arises. Thus, an open structure assists to secure a cooler cutting action than a dense structure. The strength will that the grains are held in a grinding wheel depends on the number of points of contact between grain-bond coatings, and the strengths of these connections. This indicates that grade depends upon the structure, the category of bonding material, and the amount of bonding material utilized. The grade of a grinding wheel is also termed as its "hardness". For illustration, grains might be broken loose from a soft grinding wheel more simply than from a hard grinding wheel.

Three grades of grinding wheels are Soft as A to H, Medium as T to P and Hard as Q to Z. Soft grades are utilized for hard materials whilst hard grades for soft materials.

Posted Date: 2/27/2013 2:00:36 AM | Location : United States

Related Discussions:- Grinding wheels, Assignment Help, Ask Question on Grinding wheels, Get Answer, Expert's Help, Grinding wheels Discussions

Write discussion on Grinding wheels
Your posts are moderated
Related Questions
What is the magnitude of frictional force after perfect rolling begins and why? solution) After pure rolling begins,frictional force is 0. This is because the velocity of he c

Imperfect Frame - truss: Imperfec t Frame An Imperfect frame is one that does not satisfies relation between numbers of members and number of joints given by equation

V icke r ' s Hardness Test: This test is alike the Brinell test but uses different indenter. A square based pyramid of cone angle 136 ° is used. The applied load can be 5,

Q. How to observe water level? Site for installing gauges should be properly selected. The reach should be reasonably straight and of uniform cross· section and slope. The leng

Determine least value of work: Q . Determine least value of W as shown in the figure given below to keep the system of connected bodies in equilibrium µ for surface of c

Explain the importance of Hydraulic paver machine In the center of the augers is a gear box. Kick back paddles are used to "tuck" mix under the gear box. If the paddles were n

Define What is Nose Radius? The nose radius is provided to increase finish and strength of the cutting tip of the tool. Small radii will produce smooth finish and are used on t

Bucket conveyors are used to moves the granular powdered or liquid materials. The buckets may be mounted on a chain or a belt. The movement may be vertical or flat. The ver

Kinetics of a Particle: We have seen the effect of forces on a particle. The laws of motion for a particle are extended to include a system of particles or a rigid body. It is

Q. Insulation on Flanges and Valves? Valves, flanges, and unions shall not normally be insulated unless specified by OWNER. All other fittings are to be insulated. Fittings