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 The quality of diamond depressed grinding disc for metal is one of the important factors that can improve the processing productivity and surface quality of the products. Therefore, in high-end CNC machining centers, a high-efficiency composite tool can be used to replace multiple single-function tools, and it can automatically process complex-shaped workpieces according to the machining program, thus improving production efficiency. , surface quality and reduced production costs play a very good effect.

 

 It is reported that the use of advanced and efficient abrasive grinding disc tools can significantly improve the cutting efficiency, and the increase in tool costs is far less than the decline in production costs. At the same time, advanced and efficient tools can effectively reduce various benefits such as tool change time and product quality. Therefore, considering the comprehensive consideration, the use of advanced and efficient tools is very effective in improving processing efficiency and reducing the production cost. Research and development and application of new advanced and abrasive grinding disc tools are one of the development trends of machining in the future.

 

  Then, when grinding the high-efficiency tool, when the material, structure, and shape of the tool and the selection of the grinding machine are all determined, the diamond grinding disc becomes an important factor in determining the success or failure of the machining. The technical content of the depressed grinding disc for metal and the quality of the depressed grinding disc for metal also determine whether it can produce high-quality abrasive grinding disc tools that meet the design requirements.

 

  When it comes to diamond depressed grinding disc for metal, although the processing efficiency of ultra-high temperature resin bond diamond grinding discs is lower than that of METROX grinding discs, the bonding strength of diamond grinding discs is high, the production cycle is short, and the processing cost is low, especially when grinding the cutting edge of the tool. In the case of chipping, it can also be ground into various shaped grinding wheels according to the requirements of use. Therefore, diamond grinding discs are still widely used in production.

Here to introduce the filling of the depressed grinding disc in stock.

 

In order to improve the lubrication during grinding of the grinding wheel or to prevent the sticking of the workpiece tree on the abrasive grain, the auxiliary material may be mixed in the manufacture of the depressed grinding disc in stock, or the filling material may be added by pressing, dipping or the like after the preparation. Taking cryolite as an example, when the melting point is 959 ° C, the stainless steel can be melted to surround the working surface of the depressed grinding disc in stock to prevent metal adhesion. Other fillers such as iron sulfide, polyvinyl chloride, and silver boron can decompose highly chemically active gases under the action of grinding heat. This type of gas chemically reacts with the surface of the workpiece to form a film that acts to prevent sticking. In addition, fillers such as graphite and grease mainly act as a lubricant.

 

The surface of the depressed grinding disc in stock is periodically applied with a certain pressure by using polyvinyl fluoride or molybdenum disulfide to form a film having a low coefficient of friction on the contact surface to improve the grinding state. This type of material can be seen as a solid lubricant or as another form of wheel filling.

  When I saw a piece of high quality 4.5 inches grinding wheel, I couldn't help but sigh and be proud of my own craft. We have repeatedly gone to the grinding wheelbase to learn all kinds of experience and strive to produce a grinding wheel that is satisfactory to the users. As long as you master the crafts, you will succeed if you carefully master the crafts.

 

  Good uniformity appearance and no cracks are the basic appearances of high quality grinding wheels. Excellent packaging and printing security barcodes are genuine identification marks. The lower the static balance resin of any high quality grinding disc, the better. Of course, the greater the difficulty of production, the better. The general rule of cutting and grinding is that the amount of iron to be removed is small, the wear is low, the grinding wheel is too hard, the amount of iron to be removed is small, the abrasion is large, the material is too bad, the quality of the inner quality is as little as possible, the maximum amount of iron removal, and the feel at the same time. it is good.

 

  The high-quality grinding disc is quite picky for all kinds of materials. Because of their different tissue density and heat conditions, it determines the difference between the grinding wheel. For the glass stone, there are special glass stone cutting and polishing tools on the market; copper and aluminum and stainless steel are solid. The material should be used with a lower thickness or a diced corundum-based cutting or grinding sheet; for cutting carbon steel and stainless steel profiles (non-solid), the use of a higher hardness grinding wheel will greatly improve the life; but for solid round steel Forgings require that 4.5 inches grinding disc should not be too high in hardness, otherwise it will not move!

  Processing different workpiece materials and meeting different processing needs is to choose different high efficient metal abrasive disc. There are many kinds of grinding wheels, different binders, different hardness of the wheel, according to the actual situation to choose the right wheel is the most important.

   For example, from a price point of view. Some people like cheap grinding wheels, others do not care about the price of grinding wheels, just want to find high quality grinding wheels. In fact, the two can coexist. It does not mean that high quality grinding wheels cannot be offered at a price. For grinding wheel manufacturers, you can get a high efficient metal abrasive disc.

   Choose the grinding wheel from the material of the grinding wheel. The diamond grinding wheel is the best grinding tool for non-metallic materials with high hardness and brittleness, such as cemented carbide and ceramics, optical glass, gemstone, and stone. However, because diamond is easily carbonized at 700 ~800 C, it is not suitable for grinding steel with large iron content. The hardness of CBN is slightly lower than that of diamond, but it has good thermal stability, chemical inertia with iron group elements, high thermal conductivity, long service life of the grinding wheel made of CBN, unlike diamond, will not decompose at high temperature, is a substitute for corundum grinding wheel grinding hardened steel, bearing steel, high-speed tool steel, stainless steel, heat-resistant steel and titanium alloy, etc. The best abrasives for metal materials with great hardness and toughness.

   The binder of the diamond high efficient metal abrasive disc is resin, metal, ceramic, electroplating and brazing. According to the actual use, the choice of different bonds of diamond grinding wheels, grinding efficiency, grinding quality is very important.

      There are many kinds of unqualified grinding wheels. We have also learned some, and some of them have not been known. Today we will learn about some unqualified contents of 180*6*22mm metal grinding discs, such as unqualified hardness, end face bounce, radial runout failure, and aperture. Not qualified, let's take a look at it in detail!

      1) Unsatisfactory hardness

      The hardness of 180*6*22mm metal grinding disc refers to the resistance of the bonding agent to resist the detachment of the abrasive particles from the surface of the grinding wheel under the action of external force or the ease of detachment of the abrasive particles from the surface of the grinding wheel. Hardness can correctly reflect the grinding performance of the grinding wheel and is one of the important indicators to measure the quality of the grinding wheel. There are two requirements for the assessment of the hardness of the grinding wheel:

 

      The uniformity of hardness (the difference between the maximum and minimum values of the hardness values of each point measured) is in accordance with the standard; the compliance requirement of hardness, that is, the average value of the hardness (the arithmetic mean of the measured values of the hardness of each measuring point) To be within the allowable limits of the standard. The proportion of unqualified hardness is also quite high. For example, the hardness of the flat 180*6*22mm metal grinding disc is unqualified by more than 20% of the total number of unqualified.

 

      2) End face bounce, radial runout failed

      If the end face is beating and the radial runout is unqualified, the yaw will be generated when the 180*6*22mm metal grinding disc rotates and the balance performance will be affected, which will adversely affect the machine tool and the workpiece, so it should be controlled within the allowable range.

 

      3) The aperture is unqualified

      The inner hole of the grinding wheel is the installation reference, and the hole diameter of the grinding wheel is unqualified and listed as “heavy defect” in the standard. When the diameter of the 180*6*22mm metal grinding disc is large, the grinding wheel is eccentric after installation, which makes the grinding wheel unbalanced. When rotating at high speed, it will aggravate the vibration, affect the quality of the grinding process, and even cause the grinding wheel to rupture and the equipment to be damaged. If the hole diameter is too small, the grinding wheel cannot be installed and cannot be used. If it is forcibly installed, the spindle will be scratched, and the 180*6*22mm metal grinding disc may be caused to be dark, which may cause the grinding wheel to break during operation and easily cause an accident. The case where the aperture is unqualified is the most serious in the spot check. The total number of unqualified flat wheels was 16.7%, accounting for 58.2% of the total unqualified grinding wheels.

 

  There are middlemen everywhere to promote high quality grinding disc factory price, but how can we identify those high quality grinding wheels? Learn about this knowledge to help us.

There are so many kinds of high quality metal grinding discs. There are so many kinds of grinding wheels. It's hard to remember all kinds of grinding wheels. But we can't remember all of them. We can just remember some of them. The grinding wheels are made up of binder, abrasive and matrix.

 

The three elements can be made up of many different components. Various grinding wheels are classified into resin grinding wheels, ceramic bonded grinding wheels and rubber bonded grinding wheels, cylindrical grinding wheels, cup-shaped grinding wheels, bowl-shaped grinding wheels, butterfly-shaped grinding wheels, beveled high quality metal grinding discs and parallel grinding wheels according to the bonding agent.

 

Diamond grinding wheels, boron nitride grinding wheels and tungsten steel grinding wheels.

The material used in high quality metal grinding discs to bond abrasives is called binding agent. The strength, impact resistance, heat resistance and corrosion resistance of the grinding wheel are mainly determined by the properties of the binder.

 

Grinding wheel logo: Grinding wheel and other products have their own logo, what are their logo, the following explains for you one by one.

 

The shape of the grinding wheel is represented by SPA; the outer diameter is denoted by the initials D of the English word, of course, the diameter of the hole is also D, because of all the diameters; the thickness of the high quality metal grinding disc is denoted by the English initials H; the abrasive is denoted by the abrasive initials A of the grinding wheel; its hardness is denoted by L; and the binder is denoted by B. Others are expressed directly by data.

Everything is developed step by step, and the high quality metal grinding disc is no exception. How did the grinding wheel develop? If you don't know, look down with me! Mastering the development history of grinding wheels is beneficial to the selection and application of grinding wheels.


As early as the Neolithic Age, man began to use natural grinding stones to process tools such as stone knives, axes, bones, horns, and teeth; long ago, man discovered ceramic high quality metal grinding discs fired with natural abrasives and clay; around 1900, man-made Abrasives came out, using artificial abrasives to make a variety of grinding wheels. In succession, it creates conditions for the rapid development of grinding and grinding machines. Since then, the proportion of grinding wheels in abrasives has been increasing.

 

In the past few years, the output of many hardware products in China ranked first in the world. Therefore, the high quality metal grinding disc belonging to the hardware industry naturally played a vital role. The grinding wheels strengthened the technological innovation of production, improved the level of production technology, opened the "bottleneck" restricting the innovative ability of enterprise products and the technological level of enterprises, and made new ones in time. The grinding wheel is applied to the existing equipment of the enterprise, prolongs its technical life, improves its efficiency, and ensures the product quality at the source of production.

 

With the rapid development of the Chinese economy in recent years, the technological innovation of high quality metal grinding discs has been strengthened continuously. In the future, grinding wheels will become the largest category of abrasive tools in China. At the same time, the application of grinding wheels in polishing will be greatly promoted because of the unique advantages of grinding wheels in the late grinding industrial chain. It is preliminarily predicted that Chinese abrasive products will occupy 3/5 of the world's demand for additional products of abrasive tools. As one of the main types of abrasive tools, the high quality metal grinding disc is also facing a better development situation.

The China long life grinding wheel used for grinding is composed of abrasive grains, binding agents and blowholes. If Pa, Pb, and Pp are used to represent the percentage of abrasive grain, binder and pore volume to the volume of the grinding wheel respectively, then:

When making China long life grinding wheels, adjusting the percentage of abrasive particles, binders and pore volume, different performance grinding wheels will be obtained.

The growth mechanism of abrasive grains used in making grinding wheels is different, and the breaking methods are different, and the shape of abrasive grains is very unusual. In addition, the position distribution of abrasive grains in China long life grinding wheel is random due to the structure and manufacturing process of the grinding wheel. Therefore, compared with other machining methods, grinding has many unique characteristics.

Grinding wheels are commonly used abrasives in grinding, and the amount of grinding wheels is more than that of other abrasives. Let's share the testing method of fast 9'' grinding wheel turning strength.

 

1. when the grinding wheel is installed on the rotary tester, the flange shall be tightened. The flange size should be selected according to table 1^28.

2. if the diameter of the examined fast 9'' grinding wheel is larger than the diameter of the main shaft of the test machine, the flange with shaft sleeve is allowed.

3. Multiple grinding wheels with the same outer diameter and aperture are allowed to be installed symmetrically at both ends of the spindle on the same testing machine, but the installation quantity shall not exceed the allowable installation thickness and weight stipulated by the testing machine.

4. once multiple turns, each piece must be separated from the metal washer with the same diameter of the flange. The flange and metal washer must be smooth without deformation.

5. If there are non-standard fast 9'' grinding wheels or not included in the flange size of the grinding wheel, the use of flange size should be based on the adjacent larger diameter grinding wheel to choose.

6. Inspected grinding wheel should first carry out sound (sound knock) check, sound normal can be installed before turning test, if there is mute or abnormal sound, can not be installed test.

7. When the fast 9'' grinding wheel is turning back, the rising speed can rise directly to the required number of revolutions to maintain no less than 308 times.

8. The radial runout of the spindle should not exceed 0.030101, and the direction of the end thread of the spindle should be opposite to that of the fast 9'' grinding wheel.

9. the strength of the worn wheel should be inspected again.

10. the speed of rotation is 1.6 times that of working speed.

Green silicon carbide 180*6*22mm metal grinding disc can be divided into flat grinding wheel, bevel grinding wheel, cylindrical grinding wheel, cup grinding wheel, disc grinding wheel, etc. According to the shape, it can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel and so on.

The characteristic parameters of 180*6*22mm metal grinding disc are abrasive, viscosity, hardness, binder, shape and size. Because grinding wheels usually work at high speeds, they should be tested before use for rotation (to ensure that the wheel does not break at working speed) and static balance (to prevent machine tool vibration when working). After grinding for a period of time, the grinding wheel should be trimmed to restore the grinding performance and the correct geometry.

It is forbidden to install the grinding machine in a place facing the nearby equipment and operators or where people often pass. A special grinding machine room should be set up in a general large workshop. When the grinding wheel is found to be unbalanced after being repaired or repaired, it should be repeated for static balance. When grinding the workpiece with a 180*6*22mm metal grinding disc machine, the operator should stand on the side of the grinding wheel and not operate on the front of the grinding wheel, so as to avoid grinding wheel flying out or grinding wheel breaking out and hurting people. In addition, if cracks are found in the local grinding wheel, it should immediately stop using, replacing the new grinding wheel, in order to avoid the 180*6*22mm metal grinding disc breakage injury accident.

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