Outline the basis for wheel selection, what are the three elements of a grinding wheel?

The choice of grain size mainly depends on the surface roughness and grinding efficiency of the workpiece to be ground.

Particle size refers to the particle size of the abrasive, and its size is indicated by a particle size number. When grinding with a coarse-grained grinding wheel, the production efficiency is high, but the surface of the grinding workpiece is rough; When grinding with a fine-grained grinding wheel, the surface roughness of the grinding workpiece is better, but the productivity is lower. On the premise of meeting the roughness requirements, the grinding wheel with coarse grain size should be selected as much as possible to ensure high grinding efficiency.

Generally, coarse-grained grinding wheels are used for coarse grinding, and fine-grained grinding wheels are used for fine grinding.

When the contact area between the grinding wheel and the workpiece is large, the grinding wheel with coarser particle size should be selected. For example, grinding the same flat surface with the face of the grinding wheel is coarser than grinding with the perimeter of the grinding wheel.

The choice of hardness depends mainly on the material of the workpiece to be ground, the grinding efficiency and the quality of the machined surface.

Hardness refers to the difficulty of the grinding wheel falling off under the action of external force, in order to meet the requirements of grinding and processing of different workpiece materials, the grinding wheel is divided into different hardness grades.

If the grinding wheel is selected too well, the dull abrasive particles are not easy to fall off, the grinding wheel is easy to block, the grinding heat increases, the workpiece is easy to burn, the grinding efficiency is low, and the surface quality of the workpiece is affected; If the grinding wheel is too soft, the abrasive grains will fall off when they are still sharp, which increases the loss of the grinding wheel, and it is easy to lose the correct geometry and affect the accuracy of the workpiece. Therefore, the selection of grinding wheel hardness should be appropriate, and it should also be comprehensively considered according to factors such as the size of the contact area between the grinding wheel and the workpiece, the shape of the workpiece, the grinding method, the cooling method, and the type of binding agent of the grinding wheel.

Choice of common grinding wheels

1. The selection of abrasives mainly depends on the workpiece material and heat treatment method.

a.When grinding materials with high tensile strength, use abrasives with high toughness.

b.When grinding materials with low hardness and high elongation, brittle abrasives are selected.

c.When grinding materials with high hardness, use abrasives with higher hardness.

d.Use abrasives that are not easy to chemically react with the material being processed.

The most commonly used abrasives are brown corundum (A) and white corundum (WA), followed by black silicon carbide (C) and green silicon carbide (GC), and the rest are chrome corundum (PA), monocrystalline corundum (SA), microcrystalline corundum (MA), zirconia corundum (ZA).

Brown fused alumina grinding wheel:Brown corundum has high hardness, great toughness, and is suitable for grinding metals with high tensile strength, such as carbon steel, alloy steel, malleable cast iron, hard bronze, etc., this abrasive has good grinding performance and wide adaptability, and is often used to remove a large amount of rough grinding, which is cheap and can be widely used.

White corundum grinding wheel:The hardness of white corundum is slightly higher than that of brown corundum, and the toughness is lower than that of brown corundum, and the abrasive particles are easy to break when grinding, so the grinding heat is small, and it is suitable for manufacturing fine grinding and quenching steel, high-carbon steel, high-speed steel and grinding wheels for thin-walled parts, and the cost is higher than that of brown corundum.

Black silicon carbide grinding wheel: Black silicon carbide is brittle and sharp, harder than white corundum, suitable for grinding materials with low mechanical strength, such as cast iron, brass, aluminum and refractories.

Green silicon carbide grinding wheel:Green silicon carbide has higher hardness and brittleness than black silicon carbide, sharp abrasive grains, good thermal conductivity, and is suitable for grinding hard and brittle materials such as cemented carbide, optical glass, and ceramics.

Chrome corundum grinding wheel:It is suitable for grinding tools, measuring tools, instruments, threads and other workpieces with high surface processing quality.

Single crystal corundum grinding wheel:It is suitable for grinding stainless steel, high-vanadium high-speed steel and other materials with high toughness and hardness, as well as workpieces that are easy to deform and burn.

Microcrystalline corundum grinding wheel: suitable for grinding stainless steel, bearing steel and special ductile iron, etc., used for profile grinding, plunge grinding, mirror grinding.

Zirconia corundum grinding wheel: suitable for grinding Austrian stainless steel, titanium alloy, heat-resistant alloy, especially suitable for heavy-duty grinding.

It is generally composed of abrasives, binders and pores, which are often referred to as the three elements of consolidated abrasives.

According to the different classifications of binders, the common ones are ceramic (binder) grinding wheels, orange wide calendars, resin (binders) Qiao Na grinding wheels, and rubber (binder) grinding wheels. The grinding wheel is the largest amount of abrasive, the most widely used one, high-speed rotation when used, can be metal or non-metal workpiece of the outer circle, inner circle, plane and various profiles of the rough grinding, semi-fine grinding and fine grinding, grooving and cutting of the structure of the grinding wheel refers to the proportion of the volume of the three parts of the grinding wheel, such as abrasive particles, binders and pores. Classification is usually made as a percentage of the grinding wheel volume as a percentage of the grinding grain.

There are three organizational states of grinding wheels: compact, medium, and loose; Subdivided into 0-14 levels, a total of 15 levels. The smaller the tissue number, the larger the proportion of abrasive grains and the tighter the grinding wheel; Conversely, the larger the tissue number, the smaller the abrasive grain ratio and the looser the grinding wheel.

Grinding wheel components: grinding resistant to finches, porosity, binders. The grinding wheel is also known as the consolidated abrasive, which is a consolidated abrasive that is consolidated into a certain shape by a binding agent and has a predetermined strength of hail.

According to the different classifications of binders, the common ones are ceramic grinding wheels, resin grinding wheels, and rubber grinding wheels. The grinding wheel is the one with the largest amount and the most widely used abrasive tool, which rotates at high speed when used, and can be used for coarse grinding, semi-fine grinding and fine grinding of the outer circle, inner circle, plane and various profiles of metal or non-metal workpieces, as well as grooving and cutting.

The characteristic elements of the grinding wheel and the selection of the standard permeability are made of the porous body formed by the grinding material and the binder through the blank pressing, drying and sintering. Abrasives, binders and porosity constitute the three components of the grinding wheel. The performance of the grinding wheel depends on 5 parameters: abrasive, particle size, binder, hardness and structure.

1.Abrasives undertake cutting tasks and have high hardness, wear resistance, and heat resistance.

The grinding wheel consists of three parts: abrasive, binder (binder), and pores.

Summary. 1. According to the abrasives used, it can be divided into ordinary abrasives (corundum, silicon carbide, etc.), grinding wheels and natural abrasives, superhard abrasives and (diamond and cubic boron nitride, etc.) grinding wheels;

2. According to the shape, it can be divided into flat grinding wheel, beveled edge grinding wheel, cylindrical grinding wheel, cup grinding wheel, disc grinding wheel, etc.;

3. According to the binder, it can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel, etc.

There are several types of grinding wheels commonly used.

1. According to the abrasives used, it can be divided into ordinary abrasives (corundum, silicon carbide, etc.), grinding wheels and natural abrasives, superhard abrasives and (diamond and cubic boron nitride, etc.) grinding wheels; 2. According to the shape, it can be divided into flat grinding wheel, beveled edge grinding wheel, cylindrical grinding wheel, cup grinding wheel, disc grinding wheel, etc.; 3. According to the binder, it can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel, etc.

What shape of grinding wheel should be used for grooving on the iron plate.

Disc grinding wheel.

Parameters of the grinding wheel.

BAI: binder, DU

Concentration, density, particle, material and other size parameters.

There are several types of grinding wheels commonly used.

Classification by material: green silicon carbide, black silicon carbide, white corundum, brown corundum, synthetic diamond, boron carbide, glass sand.

Classified by shape: flat, butterfly, bowl, concave, convex, arc, cylindrical.

Particle size: 40 mesh, 60 mesh, 80 mesh, 100 mesh, 120 mesh, 160 mesh.

There are generally two kinds of commonly used grinding knives: (1) black silicon carbide 80 mesh for coarse grinding (2) green silicon carbide 120 100 mesh for fine grinding.

White corundum grinding wheel (**:wa).

The basic variety of corundum, strip structure, white. The hardness is higher than that of brown corundum, the cutting edge is sharp, and the toughness is low. It is suitable for ordinary grinding of high-speed steel, alloy steel and quenched steel, and can also be used for gear grinding, thread grinding and forming grinding.

Chrome corundum grinding wheel (**:p a).

White corundum derivative variety, rose red, toughness, good grinding finish, good edge and corner retention, suitable for steel, alloy steel, quenched steel internal grinding and forming grinding, tool grinding, profiling grinding, precision grinding of instrument parts, high finish.

Single crystal corundum grinding wheel (**:sa).

Spherical multi-angular structure, yellow opportunity white, high hardness, high toughness. Strong cutting force. It is suitable for grinding high-speed steel, stainless steel and other high hardness and dry grinding, easy to deform and burn workpieces.

The shape of the grinding wheel includes parallel grinding wheel, bowl grinding wheel, butterfly grinding wheel, etc., according to your grinding machine to choose the grinding wheel selection, according to the material of the tool to choose the material, particle size, hardness of the grinding wheel.

Commonly used grinding wheels.

There are many types, which should be determined according to the model of the equipment used, the material of the processed parts, and the processing process requirements. Generally speaking, the elements that make up a grinding wheel are: shape, abrasive, size, particle size, hardness, structure, binder, and maximum linear speed.

Among them, there are 22 shapes; 6 kinds of abrasives; 20 kinds of hardness; There are 7 types of tissues. Specifications and sizes can be determined upon request.

I hope that you can get the most basic concept in less time, and then find the required grinding wheel from the basic concept.

There are two types of grinding wheels: traditional grinding wheels and superhard grinding wheels.

Traditional grinding wheels are further divided into corundum abrasive series (grinding iron. steel and other metal materials) and carbon-silicon series (grinding copper. non-metallic materials such as aluminum), and corundum and carbon-silicon abrasives can be used as ceramics. Resin. Adhesives such as rubber are made according to their use.

Superhard grinding wheels are divided into two abrasive series: SDC (diamond, ground tungsten steel and non-metallic materials) and CBN (boron nitride, grinding high hardness steel), and resin is often used according to different uses. Bronze. electroplating and other bonds.

This is the most approximate classification, and then adjust each grinding wheel according to the actual needs.

Particle size (abrasive coarseness).

Adhesion (grinding wheel hardness and softness).

Organization. Concentration (abrasive ratio).

Recipe adjustments.

I wish you all the best.

In the grinding process, a soft grinding wheel should be used when grinding hard metals. Because the grinding wheel is easy to grind at this time, in order to be able to sharpen itself in time, a softer grinding wheel should be used. On the contrary, when grinding slightly softer materials, the passivation of sand particles is slower, and a harder grinding wheel should be selected to maintain the grinding performance.

However, when grinding very soft materials, such as non-ferrous metals, the grinding wheel should be used because the grinding wheel is easy to be clogged by chips.

When rough grinding, the grinding force of the sand particles is large, and it is easy to sharpen itself, so the grinding wheel with medium hardness can be selected; When grinding at high speed, the grinding wheel has poor self-sharpening, and the hardness of the grinding wheel is 1 2 smaller than that of ordinary grinding.

In order to maintain the correct shape of the grinding wheel, a harder grinding wheel should be selected during profile grinding; When machining discontinuous surfaces, the sand particles are easy to fall off due to impact, so a stiffer grinding wheel can be selected.

Soft grinding wheels are used for workpieces with poor thermal conductivity and easy burning, such as high-speed steel cutters, bearings, etc. Hollow and thin-walled parts, which are not easy to dissipate heat and are easy to burn, apply softer grinding wheels.

Use a softer grinding wheel when the rigidity of the grinding machine is high, and a stiffer grinding wheel when the stiffness is low and there is vibration. When the grinding zone area is large, a softer grinding wheel should be chosen.

Mainly look at the size and accuracy of the grinding workpiece to choose what kind of grinding wheel, the general rough grinding particle size is about 36-70, semi-fine grinding is 80-100, fine grinding with about 150 on it, our factory is specialized in the production of grinding wheel dressing tools, so we have a better understanding of these problems. Chongqing Yangtze River Diamond Tool Factory salesman Xiao Li.

Just read the book as soon as possible, and if you want to say something detailed, some of them have been said.

The grinding wheel consists of three parts: abrasive, binder (binder), and pores.

Among them: 1. Abrasive: It is the main grinding part of the grinding wheel, with sharp edges and corners, that is, a very small cutting edge, to cut the workpiece, the abrasive is often a very hard material, usually a chemical compound, such as emery (chemical composition is silicon carbide), corundum (chemical composition is aluminum oxide), diamond, etc., the most common is emery grinding wheel and corundum grinding wheel.

2. Binder: According to the use of the grinding wheel accompanied by non-flushing, there are ceramics, resin, rubber, metal, etc., and its main function is to bond the abrasives together to form a grinding wheel with a certain shape.

3. Porosity: Porosity is also the main component of the grinding wheel, the purpose of porosity is to reduce the binding strength of the binder, store the grinding steel scraps, when the sharp part of the small scattered abrasive is bald, it will peel off due to the reduction of the binding strength caused by the porosity, revealing new sharp abrasive grains, which is conducive to further grinding processing.