Grinding wheel
A grinding wheel is a wheel composed of an abrasive compound and used for various grinding and abrasive machining operations. Such wheels are used in grinding machines.
The wheels are generally made from a composite material consisting of coarse-particle aggregate pressed and bonded together by a cementing matrix to form a solid, circular shape. Various profiles and cross sections are available depending on the intended usage for the wheel. They may also be made from a solid steel or aluminium disc with particles bonded to the surface. Today most grinding wheels are artificial composites made with artificial aggregates, but the history of grinding wheels began with natural composite stones, such as those used for millstones.
The manufacture of these wheels is a precise and tightly controlled process, due not only to the inherent safety risks of a spinning disc, but also the composition and uniformity required to prevent that disc from exploding due to the high stresses produced on rotation.
Grinding wheels are consumables, although the life span can vary widely depending on the use case, from less than a day to many years. As the wheel cuts, it periodically releases individual grains of abrasive, typically because they grow dull and the increased drag pulls them out of the bond. Fresh grains are exposed in this wear process, which begin the next cycle. The rate of wear in this process is usually very predictable for a given application, and is necessary for good performance.
Characteristics
There are five characteristics of a cutting wheel: material hardness, grain size, wheel grade, grain spacing, and bond type. They are indicated by codes on the wheel's label.Material hardness
The abrasive aggregate is selected according to the hardness of the material being cut.Grinding wheels with diamond or CBN grains are called superabrasives. Grinding wheels with aluminum oxide, silicon carbide, or ceramic grains are called conventional abrasives.
Grain size
From 10 to 600, determines the average physical size of the abrasive grains in the wheel. A larger grain will cut freely, allowing fast cutting but poor surface finish. Ultra-fine grain sizes are for precision finish work.generally grain size of grinding wheel are 10-24,30-60,80-200 and 220-600.
Wheel grade
From A to Z, determines how tightly the bond holds the abrasive.A to H for softer structure,
I to P for moderately hard structure and
Q to Z for hard structure. Grade affects almost all considerations of grinding, such as wheel speed, coolant flow, maximum and minimum feed rates, and grinding depth.
Grain spacing
Spacing or structure, from 1 to 17. Density is the ratio of bond and abrasive to air space. A less-dense wheel will cut freely, and has a large effect on surface finish. It is also able to take a deeper or wider cut with less coolant, as the chip clearance on the wheel is greater.Wheel bond
How the wheel holds the abrasives; affects finish, coolant, and minimum/maximum wheel speed.| Bond name | Bond symbol | Bond description |
| Vitrified | V | Glass-based; made via vitrification of clays and feldspars |
| Resinoid | B | Resin-based; made from plants or petroleum distillates |
| Silicate | S | Silicate-based |
| Shellac | E | Shellac-based |
| Rubber | R | Made from natural rubber or synthetic rubber |
| Metal | M | Made from various alloys |
| Oxychloride | O | Made from an oxohalide |
| Plated | P | Made by Electro / Electroless bonding of metal to hold abrasive |
Types
Straight wheel
To the right is an image of a straight wheel. These are by far the most common style of wheel and can be found on bench or pedestal grinders. They are used on the periphery only and therefore produce a slightly concave surface on the part. This can be used to advantage on many tools such as chisels.Straight Wheels are generally used for cylindrical, centreless, and surface grinding operations. Wheels of this form vary greatly in size, the diameter and width of face naturally depending upon the class of work for which is used and the size and power of the grinding machine.
Cylinder or wheel ring
Cylinder wheels provide a large, wide surface with no center mounting support. They can be very large, up to 12" in width. They are used only in vertical or horizontal spindle grinders.Cylinder or wheel ring is used for producing flat surfaces, the grinding being done with the end face of the wheel.
Tapered wheel
A straight wheel that tapers outward towards the center of the wheel. This arrangement is stronger than straight wheels and can accept higher lateral loads.Tapered face straight wheel is primarily used for grinding thread, gear teeth...
Straight cup
Straight cup wheels are an alternative to cup wheels in tool and cutter grinders, where having an additional radial grinding surface is beneficial.Dish cup
A very shallow cup-style grinding wheel. The thinness allows grinding in slots and crevices. It is used primarily in cutter grinding and jig grinding.Saucer wheel
A special grinding profile that is used to grind milling cutters and twist drills. It is most common in non-machining areas, as sawfilers use saucer wheels in the maintenance of saw blades.Diamond wheels
Diamond wheels are grinding wheels with industrial diamonds bonded to the periphery.They are used for grinding extremely hard materials such as carbide cutting tips, gemstones or concrete. The saw pictured to the right is a slitting saw and is designed for slicing hard materials, typically gemstones.
Mounted points
Mounted points are small grinding wheels bonded onto a mandrel. Diamond mounted points are tiny diamond rasps for use in a jig grinder doing profiling work in hard material. Resin and vitrified bonded mounted points with conventional grains are used for deburring applications, especially in the foundry industry.Mounted points is a small handle with a general name, used in electric mill, hanging mill, hand drill. Many of the main types of ceramic mounted points, rubber mounted points, diamond mounted points, emery cloth and so on.
Ceramic mounted points: granular sand made of ceramic binder sintering, the central supplemented by metal handle. Mainly grinding all kinds of metal, for the diameter of the inner wall of the grinding, mold correction.
Rubber mounted points: finer particle size sand combined by rubber binder
Into, for the polishing of the mold.
sandpaper mounted points:
Multi-piece rectangular sand cloth, bonding around the metal handle. Granularity is generally in the 60 # -320 #, for the diameter of the inner wall of the polishing.
Diamond mounted points: A grinding tool for non-metallic materials such as stone, porcelain and the like, and more particularly to a grinding tool using a diamond alloy as a grinding body comprising a substrate and a plurality of grinding bodies, And the substrate is preferably made of an adhesive material having a certain toughness, and the grinding body is preferably made of a diamond alloy material, and the substrate is preferably made of a diamond alloy material, The utility model has the characteristics of high grinding performance, simple manufacture and low cost, high grinding quality and can be applied to large-scale grinding.