Characteristics of sintered diamond grinding wheel

Because grinding wheel for stainless steel manufacturing process determines the surface morphology is random, the geometry, distribution and cutting edge of each abrasive grain are inconsistent. Therefore, only a few high cutting edges are cut to the workpiece during grinding, which limits the grinding quality and further improves the grinding efficiency. improve.

The sintered metal bond grinding wheel for stainless steel is mostly made of a metal such as bronze as a bonding agent and is manufactured by a high-temperature sintering method. The bonding strength is high, the formability is good, the high-temperature resistance, the thermal conductivity, and the wear resistance are good, the service life is long, and a large load can be withstood. Because the grinding process of the grinding wheel inevitably has shrinkage and deformation, the grinding wheel must be shaped before use, but the dressing of the grinding wheel for stainless steel is difficult. The conventional grinding wheel-rolling method is not only time-consuming and labor-intensive, but also the diamond particles fall off during the dressing process. The dressing wheel itself consumes a lot and the shaping precision is low.

​Characteristics of diamond grinding wheel

The diamond high quality 9'' grinding wheel has high hardness, high strength, and strong grinding ability. It is mainly used for grinding high and hard alloys, non-metallic materials, cutting hard and brittle hard alloys, non-metallic minerals and so on. Such as cemented carbide, ceramics, agate, optical glass, semiconductor materials and wear-resistant cast iron, stone and so on.

Wheel characteristics:
1. The grinding efficiency is high, and the high quality 9'' grinding wheel consumption is relatively slow;
2. Self-sharpness, low heat generation during grinding, not easy to block, reducing the phenomenon of work burns during grinding;
3. The grinding wheel has a certain elasticity, which is beneficial to improve the roughness of the surface of the workpiece, and is mainly used for the processes of fine grinding, semi-finishing, knife grinding, and polishing;
4. The diamond grinding wheel is low-temperature curing, the production cycle is short, the equipment and supply process is relatively simple; because the resin has fluidity, it is easy to form a high quality 9'' grinding wheel with the complicated surface.

Grinding wheel sheet superalloy grinding surface topography

When high quality 9'' grinding wheel grinds the superalloy, the machined surface will undergo severe plastic deformation. The resulting grinding force and grinding temperature cause the grinding surface to produce tears, wrinkles, etc. that can cause fatigue strength and resistance to stress corrosion.
High quality 9'' grinding wheel superalloy grinding surface topography.
When the high-temperature alloy is ground, severe plastic deformation occurs on the machined surface. The resulting grinding force and grinding temperature cause the surface of the grinding surface to have surface flaws such as tears and wrinkles which can cause a decrease in fatigue strength and stress corrosion resistance, thereby changing the texture of the ground surface. Let's talk about the difference between a single crystal corundum high quality 9'' grinding wheel and a white corundum grinding wheel.
(1) When grinding a high-temperature alloy with a single crystal corundum grinding wheel, as long as the grinding speed and the grinding depth are appropriate, the grinding grain is clear, and even when observed under the high magnification of 800 times and 2000 times of the scanning electron microscope, it can be seen clearly. Grinding the grain, which means that the plastic deformation during the abrasive cutting process is small.
(2) When using a white corundum high quality 9'' grinding wheel to grind a high-temperature alloy with a large grinding amount (Vs=38 m/s, a=0.03 mm), the grinding grain has changed significantly, and wrinkles are formed. The side is turned up and the machined surface is covered with an adherent.

What is the classification basis of abrasives?

There are two kinds of natural abrasives and artificial abrasives. The natural grinding tools commonly used in the machinery industry are only oil stone. Artificial abrasives are classified according to their basic shapes and structural characteristics, including a depressed grinding disc for metals, grinding heads, oilstone, sand tiles (collectively referred to as consolidated abrasives above) and coated abrasives. In addition, abrasives are traditionally used as a class of abrasives. Consolidated Abrasives can be divided into ordinary abrasive consolidation abrasives and super-hard abrasive consolidation Abrasives according to the different abrasives used. The former is made of ordinary abrasives such as corundum and silicon carbide, while the latter is made of superhard abrasives such as diamond and cubic boron nitride. In addition, there are also some special varieties, such as sintered corundum abrasives and so on.

Common abrasive consolidation abrasive tool for metal is a kind of China abrasive tools for metal which can consolidate the common abrasive into a certain shape by the bonding agent and has a certain strength. Generally consists of abrasives, binding agents and air holes. These three parts are often referred to as the three elements of consolidation grinding tools. Abrasives play a cutting role in abrasive tools. Binders are materials for consolidating loose Abrasives into abrasives. They are inorganic and organic two types. Inorganic binding agents include ceramics, magnesia, and sodium silicate; organic resins, rubber, and shellac. The most commonly used ceramics, resins, and rubber binding agents. When grinding, the air holes play the role of chip holding and discharging, and can hold the coolant, which is helpful to the heat dissipation of grinding.

In order to meet some special processing requirements, some fillers, such as sulfur and paraffin, can be impregnated in the pores to improve the performance of the abrasive tools. This filler is also called the fourth element of abrasive tools. The items that represent the characteristics of ordinary abrasive consolidation abrasives are shape, size abrasive, particle size, hardness, organization, and binder.

Abrasive hardness refers to the degree of difficulty of abrasive particles falling off the surface of abrasive grinding disc tools under the action of external forces, which reflects the strength of the abrasive particles held by the binder. The hardness of the abrasive mainly depends on the amount of the binder and the density of the abrasive. The abrasive grain is easy to fall off, which means that the abrasive hardness is low; on the contrary, it means that the hardness is high. Hardness levels are generally divided into super-soft, soft, medium-soft, medium-hard, hard and super-hard seven levels, from these levels can also be subdivided into several smaller levels. The commonly used methods for measuring the hardness of abrasive tools are hand cone method, mechanical cone method, Rockwell hardness tester method and sandblasting hardness tester method.

What type of grinding tool is the grinding wheel?

      The high efficient metal abrasive disc is the most important type of grinding tool in the grinding process. Then, the manufacturer will talk about the related knowledge of the grinding wheel.

      The grinding wheel piece is a porous body which is prepared by adding a binder to an abrasive, and compacting, drying and baking. Due to the different abrasives, binders and manufacturing processes, the characteristics of the high efficient metal abrasive disc vary greatly, which has an important influence on the processing quality, productivity, and economy of the grinding.

      The characteristics of the grinding wheel are mainly determined by factors such as abrasive, particle size, bonding agent, hardness, structure, shape, and size. The high efficient metal abrasive disc is the largest and the most widely used one. It can be rotated at high speed during use. The outer circle, the inner circle, the plane, and various profiles of the non-metallic workpiece are subjected to rough grinding, semi-finishing and fine grinding, and grooving and cutting.

      According to the abrasive used, it can be divided into ordinary abrasive (corundum and silicon carbide) grinding wheel and natural abrasive super-hard abrasive and (diamond such as diamond and cubic grinding wheel); according to the shape, it can be divided into flat grinding wheel, oblique side high efficient metal abrasive disc and cylindrical grinding wheel, cup-shaped grinding wheel, dish-shaped grinding wheel, etc.; according to the bonding agent can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel and so on. The characteristic parameters of the grinding wheel mainly include abrasive, viscosity, hardness, bonding agent, shape and size.

      In the production process, the diamond grinding wheel should be used to polish the belt. Generally, the high efficient metal abrasive disc should be unloaded and cleaned after 5-7 days of operation. The rubber scraps that have been polished have adhered to the surface of the corundum after high-temperature friction. Cleaning.
      Cleaning requirements: (1) to be environmentally friendly, free of ketones, not halogenated hydrocarbons. (2) The diamond grinding wheel cannot be damaged.