Grinding Wheels

Guizhou First Abrasives Co., Ltd. is a professional company dedicated to the research , production ,sales and services of resin bonded cutting wheels and grinding wheels. Form 2009 to 2023,we continue expanding our factory,star having 2 machines until now 35 machines.Our output ,nowadays,keep more than300000pcs/daily. As a high-tech enterprises ,we will continue to increase investment in technology research and development, introduce advanced equipment, improve product testing methods, and focus on the production of high-end products while developing new products to meet market demand.

Grinding wheels are wheels that contain abrasive compounds for grinding and abrasive machining operations. Such wheels are also used in grinding machines. The wheels are generally made with composite material. This consists of coarse-particle aggregate pressed and bonded together by a cementing matrix (called the bond in grinding wheel terminology) 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.

Result in Smooth Even Surfaces
Abrasive cutting wheels ensure you achieve precise metal cutting. They are applications that can handle tight tolerance and high precision.
Consider large diameter abrasive wheels if you are looking for a method that can achieve high-volume cutting at a moderate price.
The way large diameter abrasive wheels remove metal from the surface of the workpiece is its main advantage.
Their ability to grind and erode the workpiece helps you achieve a smooth and accurate surface.

The Grains Self Dress
These non-reinforced abrasive cutting wheels have countless sub-micron cutting particles. They self-dress when they get worn off.
The dull-edged grains usually break off to result in sharper cutting edges.
They have a continuous presentation of fresh cutting edges with each successive use. It ensures you don't worry about maintenance.

Has a Wide Variety of Applications
Aside from rods and extractions, abrasive wheels can also be used for cutting tubes and dielectric materials.
You can easily cut composite and coated metals with no limits.

Abrasive Wheels Work at a Fast Rate
A grinder wheel works at a faster rate. When compared to other precision cutting methods-laser and electric discharge machine (EDM).
You can even bundle together the materials you need to cut for cost saving on high-volume cutting. This is an extremely effective advantage as you'll also achieve a smaller diameter for a bundle with more materials.

Cut Extremely Hard Materials
Bench grinder wheels can achieve clean-cut surface finishes even with extremely hard materials. They produce the best surface finishes compared to other cutting choices.
Additionally, the cooled thin-wheel abrasives ensure little to no heat is produced. It's very useful when working on workpieces.

Abrasive and its selection
Abrasive is the main raw material for manufacturing grinding wheels, which is responsible for cutting work. Therefore, the abrasive must be sharp, with high hardness, good heat resistance and certain toughness.

Granularity and selection
Particle size refers to the size of abrasive particles. There are two types of particle size: abrasive grain and micro powder. The abrasive particles are classified by the screening method, and its particle size number is expressed by the number of holes within one inch of the screen.

Binding agent and its selection
The role of the bonding agent is to bond the abrasive particles together so that the grinding wheel has the necessary shape and strength.

●Ceramic binder (V): Good chemical stability, heat resistance, corrosion resistance, and low cost, accounting for 90%, but it is brittle, not suitable for thin slices, and not suitable for high speed. The linear speed is generally 35m / s.

●Resin binder (B): High strength and good elasticity, impact resistance, suitable for high-speed grinding or grooving and cutting work, but poor corrosion resistance and heat resistance (300 ℃), good self-sharpness.

●Regarding self-sharpness: The grinding effect of the grinding wheel mainly depends on the sharp edges and corners exposed by the abrasive grains. During the grinding process, the sharp edges and corners will slowly wear off and become dull, weakening the grinding ability of the grinding wheel. At this time, the abrasive particles on the surface will fall off or break, forming a new grinding edge to achieve a sharp grinding effect, which is self-sharpening.

●Rubber bond (R): High strength, good elasticity, impact resistance, suitable for polishing wheels, guide wheels and thin grinding wheels, but poor corrosion resistance and heat resistance (200 ℃), good self-sharpness.

●Metal bond (M): Bronze, nickel, etc., high strength and toughness, good formability, but poor self-sharpness, suitable for diamond, cubic boron nitride grinding wheels.

Hardness and selection
The hardness of the grinding wheel refers to the difficulty of the abrasive particles on the surface of the grinding wheel falling off under the action of the grinding force. The hardness of the grinding wheel is soft, which means that the abrasive particles of the grinding wheel are easy to fall off, and the hardness of the grinding wheel is hard, which means that the abrasive particles are more difficult to fall off.
The hardness of the grinding wheel and the hardness of the abrasive are two different concepts. The same kind of abrasive can be made into different hardness grinding wheels, which mainly depends on the performance and quantity of the bonding agent and the manufacturing process of the grinding wheel. The obvious difference between grinding and cutting is that the grinding wheel has "self-sharpening". Choosing the hardness of the grinding wheel is actually choosing the self-sharpening of the grinding wheel. Fall off.
The general principle of selecting the hardness of the grinding wheel is: when processing soft metals, in order to prevent the abrasive from falling off prematurely, the hard grinding wheel is used. When processing hard metals, in order to make the blunt abrasive particles fall off in time, thereby exposing new abrasive particles with sharp edges and corners (that is, self-sharpness), soft grinding wheels are used.
The former is because when grinding soft materials, the abrasive wear of the grinding wheel is very slow and does not need to be detached too early; the latter is because when grinding hard materials, the abrasive wear of the grinding wheel is faster and requires faster Update.
When fine grinding, in order to ensure the grinding accuracy and roughness, a slightly harder grinding wheel should be used. When the thermal conductivity of the workpiece material is poor, and it is easy to cause burns and cracks (such as grinding carbide, etc.), the selected grinding wheel should be softer.

Organization of grinding wheel
The organization of the grinding wheel is the proportional distribution of the amount of abrasive, bond and pore. Simply speaking, it is the distance between abrasive particles. The distance between abrasives is very difficult to measure, and the percentage of abrasive in the volume of the grinding wheel, that is, the abrasive rate, is used as the organization standard.
Depending on the organization, compact or loose grinding wheels with different densities can be made to suit different grinding conditions. The abrasive particles of the grinding wheel can be quickly broken after being blunt, so that the new blade is exposed to continue grinding.
The densely organized grinding wheel has fewer pores and the loosely organized grinding wheel has more pores. Although there are many blowholes, the bonding degree is weak, but there is a large cutting space, which can improve the cutting effect.

Dust masks (or protective masks) and glasses must be worn.

Before work, check whether the grinding wheel is damaged, whether the safety protection device is intact, and whether the ventilation and dust removal device is effective.

Before installing the grinding wheel, it must be checked whether the maximum speed allowed by the grinding wheel is compatible with the spindle speed. Wheels larger than 200 mm should be statically balanced. Cracked or defective wheels are not allowed.

The diameter of the grinding wheel chuck should not be less than 1/3 of the diameter of the grinding wheel. The chuck and the grinding wheel should be cushioned with a soft liner of 1-2 mm, and the outer diameter should be 2 mm larger than the diameter of the clamping surface of the chuck.

When installing the elbow, pay attention to the degree of compression of the nut. It should be compressed until the grinding wheel rotates without slipping. When there are multiple compression screws, the screws should be tightened gradually and evenly in the diagonal order.

After the grinding wheel is installed, the protective cover must be reinstalled, and then the trial rotation is carried out. Grinding wheels with a diameter less than 400 mm should be idle for 2 minutes; wheels with a diameter greater than 400 mm should be idle for 5 minutes. When the grinding wheel rotates, no obvious vibration is allowed.

When adjusting the wheel guard and workpiece carrier, it must be done after the wheel stops. Always keep the distance between the workpiece carrier and the grinding wheel less than 3 mm.

When polishing, start the dust suction device, hold the workpiece firmly, do not use excessive force, and do not use the lever to push the component. It is strictly forbidden to stand on the front of the grinding wheel to prevent the grinding wheel from breaking and hurting people.

Grinding wheels that are not specifically used for end face grinding are not allowed to be used for end face grinding.

When using a hand-held electric grinder to grind, there must be a solid protective cover and a protective zero line or a leakage protector, and follow the safe operation rules of the electric hand grinder.

After the work is completed, the power supply should be cut off and the grinding wheel must be stopped before leaving the position.