Successful trial of synthetic diamond and put into production

First Machinery Ministry research units and factories in the country many research institutes and factories strong support and assistance, self-reliance, a successful trial of  cutting tools  diamond and put into production. Synthetic diamond is an  abrasive grinding  developed in recent years of new products, the production of such products on the technical preparation demanding. Its performance with natural diamond, as is the development of modern industry indispensable thing. Only a few countries in the world to produce the synthetic diamond.

The system energy change occurs in favor of the solid structural changes such electronic

If the energy change in favor of this occurs in the solid changes in the electronic structure, the high temperature phase transition occurs in the solid state, or may occur in the molten state or vapor state. This change occurred in the melt condition that the bonding characteristics of the distribution of the valence  polycrystalline diamond  statistical weight reduction effect tends to disappear remote orderly, coordination number is changed; the electronic excited state statistical weight chemotaxis to increase the role of short-range order corresponding enhancement. This change occurred in the gas condition that elemental interatomic or  abrasive grinding  bonding of the compound of the electron energy levels tend to disappear, all electronic transfers to a single atom or molecule level up, so that the electrons in the excited state is more statistical weight is increased. Accordingly, synthetic diamond can be solid, but also may be in the melt state and the vapor state conditions, depending on the pressure, temperature and component concentration and other factors can cause changes in the system. From the kinetic point of view, but also requires a carbonaceous material such as graphite into diamond with an appropriate transition rate.

Grinding tools, durability comparable unground improve

Practice shows that, after careful grinding tools, unmilled comparable durability increased by 50 percent. Using a cooling lubricant can reduce the temperature of the cutting zone and reduce tool and workpiece, the friction between the tool and the chip, to improve the tool life is advantageous. Experiments show that, with the emulsion  cutting tools  the cutting zone temperature 50 ℃ ~ 100 ℃, with cutting oil can reduce the cutting zone temperature 40 ℃ ~ 60 ℃. Therefore, high-speed steel cutting tool under conditions of heavy load, the multi-use aqueous cooling lubricants, cutting load lighter and requires high precision and surface roughness  abrasive grinding  are much lower with lubricant oil, the tool and lubricating film formed between the workpiece surface, to reduce friction. Carbide good heat resistance, generally without coolant, but in general steel with high-temperature  Polycrystalline diamond  finishing materials, in order to improve the durability of the tool, to ensure accuracy and surface roughness of the workpiece can also be used extreme pressure cutting oil emulsion or cooling lubrication. In summary, our analysis clearly affect the tool life of these factors and the relationship between them, may be based on the specific circumstances of the workpiece material, selection of appropriate materials and cutting tool, select the appropriate tool geometry, quality assurance tool sharpening and cooling lubrication conditions, in order to protect the higher tool life.

The strength of the workpiece material, the higher the hardness, the higher the cutting temperature generated, the faster tool wear

The strength of the workpiece material, the higher the hardness, the higher the cutting temperature generated, the faster tool wear, tool life is lower. Cutting carbon structural steel, carbon steel for tool life have a greater impact. The higher the carbon content, the proportion of cementite and pearlite greater the higher the hardness,  Polycrystalline diamond . Therefore, when the high-carbon steel cutting tool wear faster, lower durability; carbon steel cutting tool wear is relatively slow, durability is relatively high. Further processing of the material elongation of  Diamond blade  thermal conductivity, are to make the cutting temperature, reduced tool life. Tool material impact on tool life tool cutting part of the material affect tool life is a major factor in improving the cutting tool material, the use of high, the more wear and durability is also higher. Quality tool  grinding wheel  and cooling lubrication conditions on tool life of tool sharpening quality durability of the tool has a great influence. Such as cemented carbide cutting tools with silicon carbide grinding wheel, if no fine whetstone grinding, due to the small gap serrated blade, the higher front flank surface roughness and other reasons, the tool wear faster, low durability, and sometimes also easy chipping.

The impact of tool life was "hump-shaped"

Tool geometry parameters on the tool life of:Durability of the rake angle of the tool is clear, and too large, the blade reduces the strength, heat is poor, and easily damaged; if too small and the cutting force and the cutting temperature is increased too much, the durability of both cases are  polycrystalline diamond  rake angle influence on tool life was "hump-shaped", which is the highest peak of the anterior horn durability. Main angle decreases,  Polycrystalline diamond  strength,  Diamond blade  heat dissipation, durability increased. Furthermore appropriately reduced and vice angle increases the tool nose radius can increase strength and improve heat dissipation, so that tool life increased. Tool geometry parameters on the tool life have a more significant impact, is reasonable and advanced tool geometry is one important indicator of whether or not.

Ensure that the tool reasonable method durability

The first method is based on the principle of a single workpiece to develop a minimum durability, called the maximum productivity Durability: The second method is the method  polycrystalline diamond  lowest cost per work step to develop durability principle, known lowest cost Durability: the third method is based on the profit obtained per unit of time to develop maximum durability, called the maximum profit durability.
Analysis shows that the three following  grinding wheel  exists between durability, namely the production of general use of the lowest cost durability, and only when the production task is urgent, or an imbalance in the production of the weak link when it is used in the highest productivity durability.

Tool wear to a certain limit will no longer continue to use

Tool wear to a certain limit will no longer continue to use, the wear limit is called blunt standards.  grinding wheel  Standard ISO uniform regulations after the surface was measured with the wear width VB as a blunt tool wear standard. In actual production, in order to be more convenient, quickly and accurately determine the tool wear, tool life generally is to indirectly reflect the standard blunt tool.
After sharpening the cutting tool from the beginning up until the amount of wear experienced by blunt  Abrasive grinding wheel  total cutting time is called the tool life. Tool life and tool regrinding tool life is the product of the number of times that a new tool into use until retirement from the start until the total cutting time.

Tool life and wear rate on

Tool life refers to the so-called post-sharpening cutting tool from the beginning to achieve blunt standards, the use of cutting time. The wear limit is determined, tool life and  cubic boron nitride . Wear the slower the speed, the higher durability, so any impact tool wear factors must affect tool life. Tool life and cutting tool is a measure of an important  abrasive grinding  of good or bad. So we have to analyze the factors that affect tool life, which effectively controls the relationship between these factors in order to obtain a reasonable tool life, the tool has good machinability.

Good positioning, a solid structure with an excellent combination

Good positioning, solid structure combined with an excellent e-commerce, a service in China and the global leader in CNC tool community providers, is the enterprise to develop new markets, increase brand equity, access to information, the best  polycrystalline diamond  building business networks. CNC tool global enterprise network for buyers and sellers  abrasive grinding  to build winning online trading miracles, and strive to build the first brand manufacturing media for enterprises to provide a three-dimensional marketing services!

CNC tool worldwide network located in convenient

CNC tool worldwide network located convenient transportation, industrial and commercial capital of the southern coastal Shenzhen, close to the most influential mechanical metal mold, has always been committed to creating the most professional and  Polycrystalline diamond  CNC tool portal.
CNC tool global network established in 2006, created by the Publishing Resources honor products, Shenzhen City Network Technology Co., cattle Mai exclusive carrier. Relying on the magazine market visibility, extensive professional information resources and convenient, perfect service functions, and the country machining industry,  Synthetic diamond  for domestic and foreign enterprises, dealers and the general tool to provide timely, reliable, practical information on the full range of information and technical consulting services, specialized in the field of the entire CNC tool web development, e-commerce solutions, web promotion and other projects, the development of CNC tool industry network to promote the preferred site.

Machining and hardware development tools industry mushroomed

Rather, machine, tool grinder rise began in the early 1980s, this time on the market are mostly from tool grinder machine tool plant in Wuhan with Xianyang Machine Tool Plant. In the late 1990s, with the deepening of reform and opening up and development of technology, machining and hardware development tools industry mushroomed,  polycrystalline diamond  tool grinder or production can not meet the current needs of the market. In response to market demand, the emergence of a number of emerging tool grinder manufacturers, like Yingkou Guanhua machine, Taizhou Peking machine tools, Huaying Seiki, Wenling US-Japanese machine tools, Dongguan Gong  grinding wheel . These emerging enterprises to join makes the current market supply and demand gradually becoming saturated. For grinding users, this is a double-edged sword, good news is the majority of consumers have more to compare and choose, the bad side is that some newly added machine tool manufacturers, in order to compete for more market share to Buying at the expense of the interests as the starting point.

For basic at or near the level of similar imported products Tool

For basic at or near the level of the tool similar imported products, should be improved in the appearance of the product, the corresponding increase in some of the surface treatment process. Step up publicity efforts and improve service levels.  (2) tool should vigorously develop the user's rough market. Due allowance big  abrasive wheels  tool consumption and relatively low accuracy requirements, the tool is easy to be competent, the user can take advantage of the price advantage of lower processing costs.  (3) in the user processing sites spatula, tool up and down easily and does not affect the production sequence, you can promote the use of tools.  (4) in the blade can not meet the user requirements of the case, consider the introduction of blade, using the corresponding domestic cutter body to support, in order to improve the performance of  grinding wheel , the tool has excellent low-cost advantage.  (5) increase the variety and quantity of tools for users to create service network to help users analyze and evaluate processes to provide users with specially designed tools, special tools and so on.  (6) Quality is the key to market share. At the lowest possible publicity, promotion, using existing domestic knives while actively tracking technology innovation developments, learn from the advanced experience, try to avoid detours, to achieve leapfrog development, efforts to develop and improve the tool design, manufacture and use of technology, technical innovation, improve product quality and performance, shorten the gap with foreign products, and strive to make carbide indexable cutting tool in the variety, quantity and performance breakthrough, increase their market share.

High-speed rotating cutter tool when exposed to various parts of the centrifugal force

High-speed milling process in the automotive, aircraft and mold manufacturing widely used. As high-speed rotating cutter tool when exposed to various parts of the centrifugal  cubic boron nitride  exceeded the role of cutting force itself to become a major tool load, and the centrifugal  grinding wheel  a certain level will cause the tool deformation or rupture, so the safety of high-speed milling technology the development of high-speed milling technology has an extremely important significance.

Wheel blockage causes the grinding force increases

Different grinding fluid grinding effect a great impact on the current generic emulsion contains a lot of mineral oils and oil additives, oil in water was diluted milky white liquid, it is the specific heat capacity and thermal conductivity, in the intense  grinding wheel  very easy cause adhesion between wheel and workpiece wear and diffusion wear, clogging of the grinding wheel, grinding force increases, the final cause crushing and abrasive premature shedding, the grinding ratio decreases. Therefore, the choice of excellent grinding fluid to  abrasive grinding  performance has an important role.
Wheel hardness, particle size, organization, wheel speed, cutting mode, the cutting depth of the grinding  Synthetic diamond  and other factors clogging phenomena important parameter. Therefore, to solve this problem, it is necessary for these parameters in multivariate experimental research, summed up the law to find an effective way to guide the production.

The larger grain load, the more shallow abrasive cutting depth

Experiments show that the work twice as fast, wheel blockage increased threefold. Because the higher the speed the workpiece, abrasive load greater, the more shallow depth of cut grain, chip  abrasive grinding  area becomes small, when the grinding thickness increases, and glazing increase, increase the grinding wheel layer extrusion of the workpiece equivalent wheel features harden, thus exacerbate wheel clogged.
In the grinding way, all wheel and workpiece increases the contact area of the grinding wheel will  ubic boron nitride . This is because the contact area of the wheel and the workpiece, the cutting edge of abrasive wear scar at once on the same scratch the workpiece on the grinding wheel layer enhanced intensified cooling fluid into the grinding zone and difficult, grinding more heat, high temperature , to create  cutting tools  for the blockage, easy to produce chemical adhesion clogging and blockage embedding. End mill grinding than weeks as easy to plug, horizontal than vertical plunge grinding grinding congested.

Hardness of the abrasive wheel off the ease of

The hardness of abrasive grinding means ease of shedding, guaranteed by the strength of the binder, they blocked the grinding wheel greater impact. The higher adhesive strength, wheel hardness greater, the amount of the more blunt abrasive, abrasive workpiece before shedding scratch, squeezing even more serious debris easier  Abrasive grinding wheel  filled into the pores to wheel, wheel debris in the gap exacerbated the friction wheel on the workpiece material, extrusion, while the debris can be strengthened in this process, this process is accompanied  Polycrystalline diamond  friction heat, friction heat is provided frit bonding material blockage. Therefore, the higher the hardness wheel, blocking more serious. So grinding hard  abrasive wheels  materials should be selected softer wheel.
Organization reflects abrasive wheel, binder, the ratio between the pores, the more dense tissue, the smaller the percentage porosity, the smaller the distance between the cutting edge, the grinding wheel is more easily blocked. Containing 53% of the abrasive grit grinding wheel of 49.2% compared with the average amount to be twice as high congestion, with 45% abrasive grit grinding wheel of 49.2% compared with an average less than half the amount of blockage.

The thermal stability for clogging the abrasive has a decisive influence

The abrasive material of different chemical affinity with different workpiece, grinding at different temperatures, different grinding force, in order to reduce congestion level, different workpiece materials, should be used in different types of abrasives.  cubic boron nitride  grinding with iron-carbon alloy, carbon and oxygen in the air to generate a thin oxide film can effectively prevent the workpiece and the chemical affinity between the abrasive effect, but grinding titanium, is much more serious  abrasive wheels  the. The thermal stability for clogging the abrasive has a significant impact, thermal stability, good thermal stability than the abrasive clogging much lighter. Such as cubic boron nitride abrasive grinding with titanium, the grinding efficiency than Baiyu Gang abrasive increase several times.
Abrasive particle size
The same premise in the organization, the more fine abrasive, grinding wheel grit size units within the perimeter  polycrystalline diamond , the more uniform the number of stomata have more time, but the smaller the volume of a single pore in the same grinding parameters, the fine wheel prone to clogging. In the semi-fine grinding and fine grinding, cut more often, cut a small amount of low temperature, light blockage, often choose fine grinding wheel. In the coarse grinding, cut into large, grinding, high temperature, wear debris clogging the pores, sintered materials and more, should be selected coarse grinding wheel.

Through multiple random grinding, abrasive four weeks will be a lot of debris adhering

   Most of the grinding process the input power into the grinding heat, the grinding point temperature up to 1200K or more, at such a high temperature under the action of  polycrystalline diamond  first case of air quickly oxidized to form low melting point metal oxide, followed by the metal oxide was heated at high temperature in the grinding zone melting state, covering the surface of the wheel when the wheel again on the surface of this part in the grinding, the grinding force of the, some pushed open,  cutting tools , increased affinity and adhesion of the grinding wheel, as well as the adhesion of the workpiece surface is pressed ridge groove surface. Through multiple random grinding, abrasive four weeks will be a lot of debris adhesion, the grinding force increases, the temperature rises,  Synthetic diamond  a vicious cycle, increasing congestion, until the grains broken or fall off, which is melted adhesive .
Chemical affinity between the different elements are bonded blockage is another important reason. And the grinding abrasive material in the heat exposure, the temperature factors to enhance their activity, increased affinity, when have certain conditions, leads to chemical reactions, the abrasive particles and debris on the wheel surface ability to produce a loss of cutting crystals.