Choosing The Right Grinding Wheel

The grinding wheel is a cutting tool. It's an abrasive cutting tool.

In a grinding wheel, the abrasive performs the same function as the teeth in a saw. But unlike a saw, which has teeth only on its edge, the grinding wheel has abrasive grains distributed throughout the wheel. Thousands of these hard, tough grains move against the workpiece to cut away tiny chips of material.

Abrasive suppliers offer a wide array of products for a wide array of grinding applications in metalworking. Choosing the wrong product can cost the shop time and money. This article presents some of the fundamentals of selecting the best grinding wheel for the job.

Abrasives—Grits and Grains
Grinding wheels and other bonded abrasives have two major components-the abrasive grains that do the actual cutting and the bond that holds the grains together and supports them while they cut. The percentages of grain and bond and their spacing in the wheel determine the wheel's structure.

The particular abrasive used in a wheel is chosen based on the way it will interact with the work material. The ideal abrasive has the ability to stay sharp with minimal point dulling. When dulling begins, the abrasive fractures, creating new cutting points.

Each abrasive type is unique with distinct properties for hardness, strength, fracture toughness and resistance to impact.

Aluminum oxide is the most common abrasive used in grinding wheels. It is usually the abrasive chosen for grinding carbon steel, alloy steel, high speed steel, annealed malleable iron, wrought iron, and bronzes and similar metals. There are many different types of aluminum oxide abrasives, each specially made and blended for particular types of grinding jobs. Each abrasive type carries its own designation-usually a combination of a letter and a number. These designations vary by manufacturer.

Zirconia alumina is another family of abrasives, each one made from a different percentage of aluminum oxide and zirconium oxide. The combination results in a tough, durable abrasive that works well in rough grinding applications, such as cut-off operations, on a broad range of steels and steel alloys. As with aluminum oxide, there are several different types of zirconia alumina from which to choose.

Silicon carbide is an abrasive used for grinding gray iron, chilled iron, brass, soft bronze and aluminum, as well as stone, rubber and other non-ferrous materials.

Ceramic aluminum oxide is the newest major development in abrasives. This is a high-purity grain manufactured in a gel sintering process. The result is an abrasive with the ability to fracture at a controlled rate at the sub-micron level, constantly creating thousands of new cutting points. This abrasive is exceptionally hard and strong. It is primarily used for precision grinding in demanding applications on steels and alloys that are the most difficult to grind. The abrasive is normally blended in various percentages with other abrasives to optimize its performance for different applications and materials.

Once the grain is known, the next question relates to grit size. Every grinding wheel has a number designating this characteristic. Grit size is the size of individual abrasive grains in the wheel. It corresponds to the number of openings per linear inch in the final screen size used to size the grain. In other words, higher numbers translate to smaller openings in the screen the grains pass through. Lower numbers (such as 10, 16 or 24) denote a wheel with coarse grain. The coarser the grain, the larger the size of the material removed. Coarse grains are used for rapid stock removal where finish is not important. Higher numbers (such as 70, 100 and 180) are fine grit wheels. They are suitable for imparting fine finishes, for small areas of contact, and for use with hard, brittle materials.

Metal Cutting Disc

  Metal cutting saw blades for tools that use circular blades do not typically resemble traditional cutting blades with teeth around the outside edge. Instead, a solid abrasive disc is used to make the cuts. The disks are made from an abrasive mix of grit and adhesive, formed into a circle, with a fiber webbing running through it.
  Most typical electric angle grinders use a 4 1/2-inch diameter abrasive disc. The disc is supported on an axle bolt with a cupped washer underneath fastened in place with a nut. The disc spins on a horizontal plane with the front edge protruding from the front end of the tool. Cuts are made with one hand on a handle above and behind the disc. The other hand operates a trigger at the back end of the tool. The discs vary in thickness and abrasiveness depending on the type of cut needed. A metal cutting disk for hardened steel is also available, made from steel with a diamond-coated edge.
  Metal cutting discs for circular saws of standard size are 7 1/4 inches in diameter. They are made similarly to discs for angle grinders but without the cupped center washer. A diamond-shaped plate with a round hole in the center is used for mounting. Circular saws are best for light cutoff on a few pieces, or cutting sheet metal and metal paneling. Metal discs can also be used with a diamond-coated edge, with vent notches at regular intervals.
A cutoff saw wheel is larger than either an angle grinder or circular saw disc. It is typically 10 or 12 inches in diameter. The saw's cutoff motion drops the disc down through the material for a clean cut at a straight 90 degrees. Metal discs for cutoff saws may require lubrication from saw wax to prevent overheating. Cutoff saws are used for cutting pipe, metal studs, metal strap and square metal stock.
  Smaller cuts for projects such as body work and machining are often made with rotary tools. Rotary tools can be fitted with a wide variety of grinding, cutting and sanding accessories. The cutting discs are small, ranging from 1 to 2 inches in diameter. They are very thin, made with metal with a diamond-coated edge. Abrasive wheels are also available. Rotary tools are used for cuts in sheet metal and other lightweight materials.

Tile cutting disc you can cut glass

No,cutting discs has high tensile, impact and flexural strength. Because the cutting disc  own characteristics, easy to use cut pieces chopped glass, cut glass using a glass cutter.
Glasscutter here refers to a tool used to cut glass. Section usually glass cutter for cutting glass hardness greater than diamond or alloy material.
Cut glass technique
First, use a glass cutter cut 2-3mm thick plate glass
Cutting 2 a 3m-thick plate glass available 2mm × 12mm thin wooden ruler, the first amount of glass the size of the ruler fix cut size, consider leaving neutral and 2mm 3mm incision. Cutting may have a size of one side against the side of the glass. Glasscutter close to the other end of the straightedge, grasp the blade end straight draw back, you can not have the severity of bending.
Second, with a glass cutter cut 4-6mm thick glass
4-6mm thick glass cutting method is generally the same as above, but the glass is thick, cutting to hold accurate, predict with confidence, forced the severity uniform. Another cutting method is to use 4mm × 50mm ruler, cut glass cutter against ruler. When cut, the cut in the mouth to brush up on some kerosene in advance, so that after nicking permeability easy to pull off.
Third, use a glass cutter cut 5-6mm thick chunks of glass
5-6mm thick chunks of cut glass and cutting the same method with 5mm × 40mm ruler. But the larger chunk of glass, people stand on the ground can not be cut, and sometimes need to stand on the glass cutting, you must pad flannel on the bench before cutting the glass under pressure even after cutting the glass with both hands required, while down plate off, not careless, resulting piece of glass breakage.
Fourth, glass cutter cutting wire glass
Wired glass cutting method with 5 a 6mm plate glass, wire glass cutting surface but rugged, cutting edge slippery, difficult to master, so to understand the blade, hold steady head, forced glass bigger than the average speed but also faster, so as not to appear bent not straight. After cutting the glass with both hands pull down firmly, clip wire can dial off, then use pliers to clamp the wire cut down, so as not to cut through the palm when handling.
Fifth, cut by a glass embossed glass
Embossed with a glass cutter glass cutting, embossing surface should be at the cutting wire glass with the same methods.
Six, with frosted glass cut glass cutter
With frosted glass cutter cutting, rough surface should be lower, and flat glass cutting method is also the same.

What is stainless steel special cutting disc material

Stainless steel special cutting disc is a cut sheet, as the name implies, it is designed to cut stainless steel cutting blades. This cut piece of material has a lot
1, corundum: industrial alumina powder as raw material, melting temperature above 2000 degrees to an arc formed after cooling, crushed plastic, magnetic separation to iron, screening into a variety of size, its dense texture, high hardness, grain the formation of sharp form for use in the manufacture of ceramics, resin bonded abrasives and grinding, polishing, sand blasting, precision casting (casting special corundum), etc., can also be used to manufacture advanced refractories.
2, corundum: bauxite, coke (anthracite) as the main raw material in electric arc furnace smelting at high temperature, it made use of abrasive, suitable for grinding high tensile metals, such as various Universal steel, malleable iron, hard bronze, etc., can also be manufactured advanced refractories. It has high purity, good crystalline liquidity, low coefficient of linear expansion, corrosion-resistant characteristics.
3, silicon carbide: with quartz sand, petroleum coke (or coal), wood as a raw material by high temperature resistance furnace smelting. In contemporary C, N, B and other high-tech non-oxide refractory materials, and silicon carbide is the most widely used and most economical one. It can be called emery or refractory sand, looking to adopt.

Resin-cutting storage and use precautions:

1, cutting discs handling must be handled with care to prevent the collision entire crack!
2, cutting disc should be stored moisture, antifreeze, anti-deformation, cut pieces on a wooden pallet should paperback or wooden plate, stack height does not exceed the value of the general!
3, resin-cutting storage time of one year, over the time the rotation should be re-tested to confirm compliance before using!
4, the installation angle to the cutting blades mill, require contact with the cutting disc flange surface clean and smooth, elastic moderate tightening requirements for cutting films, only allowed to use special wrench reinforcement, prohibit the use of supplementary fixtures to prevent abrasive man-made damage!
5, the cutting speed can not exceed the work piece using line speed cutting sheet under the trademark when using pneumatic grinding machine, to prevent pressure instability, resulting in cut sheet exceed the maximum speed!
6, the use of films to be slowly cutting into force, excessive force prone to stall, stuck and crashed cutting discs phenomenon, the event should be immediately cut the jammed sheet filed to avoid cutting discs burned out or broken card!
7, cutting discs only allow monolithic installation, it is strictly prohibited two or more than two simultaneous installation!
8, resin-cutting is only allowed for cutting, are not allowed for grinding!
9, cutting slices using equipment shall comply with the provisions of grinding machinery safety regulations!
10, users in the use of abrasive cutting discs are in compliance with safety rules!

Green cutting discs is mainly used for

Green abrasive cutting disc mainly used for cutting steel, stainless steel and other metal parts.
Green cutting discs, namely resin cutting disc, based resin binder to glass fiber mesh to the bones, with a variety of materials for steel, stainless steel and other difficult to cut materials, cutting performance is particularly significant. Dry ﹑ wet two cutting mode, the cutting accuracy is more stable, while the cut pieces of material and hardness of choice, can greatly improve cutting efficiency, save production costs.

After cutting disc cut several times soft, what is the reason

First, look at what materials you cut, you cut followed depends on the thickness of the material is usually the case after cutting disc Jidao softened reasons:
1. The thickness of the material being cut, large cut pieces while lifting area, resulting in adverse heat;
2. The material itself is cut low melting point, partial combustion during the cutting process, such as cutting wood, as this type is not suitable for flat cutting disc operations;
3. Cutting-chip, low hardness, poor quality, after cutting wear and tear, resulting in direct friction between the cutting plate and the material being cut, a lot of heat, cutting discs  soften.