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  • Correct Operation Of BT-150M Tool Grinder

    Development space of Tool grinding machine The tool grinding machine has high precision, good rigidity, and economy. It is especially suitable for sharpening various small and medium-sized tools. Such as reamer, tap, twist drill, reaming drill, various milling cutters, milling cutter heads, and shape cutters. With the corresponding attachments, it is possible to grind the outer circle, the inner circle, and the plane, and also grind the sample and the mold. A variety of carbide tools can sharpen with a diamond wheel. is mainly composed of a bed, cross slide, lifting sleeve, grinding head and various accessories. There are four kinds of movements: spindle rotation, longitudinal movement, lateral movement, and vertical lifting movement. The longitudinal movement adopts the rolling steel guide rail. The lifting sleeve is the rolling screw drive; the lateral movement is the sliding guide rail. The grinding head spindle can realize four kinds of rotation speeds for grinding different tools. As indispensable equipment for industrial manufacturing, China's tool grinding machine industry is growing at a double-digit rate every year, ushered in a period of rapid development. Tool grinding machines have become the mainstream of China's machine tool consumption. In recent years. The strong demand for China's CNC machine tool industry will continue to maintain rapid growth, with an average annual compound growth rate of 37.4%. The domestic machine tool industry presents a situation of joint development of state-owned, private and foreign-funded enterprises. The industry structure is optimized, and the overall quality is significantly improved. Faced with the fast-growing demand and the vast market space, China's CNC machine tool industry is constantly forging ahead, comparable to Europe and the United States. A number of key technical indicators of CNC machinery in China have reached the international advanced level, and some indicators have even reached the world's leading level, providing a guarantee for China's growing demand. Adjusting the worktable of the tool grinder BT-150M tool grinder hydraulic system belongs to closed circulation pipeline, the fault is invisible, and the difficult diagnosis is its main feature. The worktable is driven by hydraulic pressure oil to push the hydraulic cylinder to reciprocate longitudinally. When the workbench is reversing, it is found that Impact or significant retention will directly affect the dressing of the grinding wheel. The tool grinder can be adjusted by adjusting the screws on both sides of the control box. Generally, the screw can be screwed in when the impact phenomenon occurs, and the opposite is true when there is a detention phenomenon. When adjusting, pay attention to the adjustment screw, whether it is the end of the control phase adjustment. Otherwise, it will be counterproductive and creates new faults. After adjustment is complete, the screws should be re-locked. When there is still retention and impact after the adjustment of the tool grinder, it is necessary to scrape the contact surface between the workbench and the guide rail vertically parallel. And the mechanical oil and stearic acid are heated by about 150 °C and then added to the table rail after cooling. Correct operation of the tool grinder 1. Wipe the tool grinder work platform and wipe the bottom of the level. 2. Use the left and right handwheels to move the table to the left, then place the level on the left and right and front and back of the work surface. Adjust the foot screws, and slowly adjust the level. 3. Use the left and right handwheels to move the table to the right, place the level on the left and right and front and back of the table, and then adjust the foot screws to make them level. 4. Move the workbench to the operator side with the front and rear handwheels and level the workbench (the same method as above). 5. Use the front and rear handwheels to move the workbench to the side of the operation and level the workbench. 6. Before and after the work platform, the horizontal level is here, within 0.02-0.03mm and can be. 7. The workbench must be ground at the school level. This way, if you look at the plane and feel it is not vibrating and feel, you can do it if you have no problem. In general, it is mainly to pay attention to the dressing of the grinding wheel of the tool grinding machine. Before the dressing, the grinding wheel should be statically balanced, so that the operation of the grinding wheel is no problem. Then, when grinding the tool grinder table, it is necessary to control the traverse speed, which can slow down appropriately to avoid trimming unevenness. The amount of coolant added during the dressing process is also critical. When the workpiece is machined, the amount of heat generated is much higher. When you trim the workbench, the coolant is less, mainly to ensure the deformation of the table when trimming and processing the product. Beijing Demina Precision Machinery co., ltd a professional . If you are interested in our products, you can come to consult or inspect.
  • Notes For Tool Grinding

    Notes For Tool GrindingWhen you use our super-hard tool grinding machine for grinding tools, please note them.1) pay close attention to the contact between the grinding wheel and the workpiece surface during operation. When the surface of the workpiece just contacts the grinding wheel, continuous sizzling sound can be heard, the water trace on the surface of the workpiece can be taken away by the rotating grinding wheel, at the same time, a faint spark can be seen, then the cooling fluid can be added. The saponification solution with a slightly higher concentration should be selected as the coolant. Then feed, each feed is 0.005mm/ each double stroke. When the spark disappears and the grinding is completed, then the transverse feed handwheel is pressed in the direction of feed so that the grinding wheel is slightly pressed into the workpiece, but no feed is made, which is equal to the polishing of the workpiece, in order to further improve the grinding surface quality.2) when grinding is carried out at a high ambient temperature (such as in summer), the headlamp of the machine shall not be close to the workpiece to prevent the workpiece from being heated up and affecting the grinding quality.3) if the workpiece surface is pulled, it means that the coolant is not clean or there is floating sand on the surface of the grinding wheel. The coolant should be filtered again or the floating sand on the surface of the grinding wheel should be brushed off.4) in case of partial burns on the workpiece, it may be caused by insufficient cooling fluid, too much feed, or passivation of the grinding wheel.5) if there are small ripples on the surface of the workpiece after processing, it may be caused by the loosening of the spindle, motor vibration, or other reasons, the corresponding measures should be taken to solve the specific situation.
  • Tools Grinding Industry

    The PCD tool needs to be sensitive in its operation. The stroke stop in the equipment needs to be adjusted according to the length of its workpiece grinding. It is fastened in use and the PCD tool is in the second step. The process of the knife needs to be slow. When measuring the workpiece with a plug gauge or meter, the PCD grinding wheel should be withdrawn from the workpiece and stopped. Composition of the PCD tool The compensation of the PCD tool or the feed is mainly performed by two non-interference transmission mechanisms so that the fore feed system in the machine will have a fixed grinding function when used, and the whole device will effectively use its liquid. Both dynamic and manual feed modes. PCBN Tools Grinding will effectively have a fast-jumping mechanism, so the equipment does not have to be manually re-retarded with a medium-stop device after exiting the grinding wheel for measurement or trimming. The retracting distance can be adjusted as needed to reduce the auxiliary time. The starting handle on the workbench will be effectively equipped with safety interlocking device, which will effectively ensure safety during loading and unloading and measuring work to a certain extent. The high speed of the machine tool wheel shaft is 24000 rpm, in order to improve Grind the holes. Use of PCD tool It can be divided into an internal grinding machine when it is used. It is a widely used tool grinding machine on the market. It is equipped with an inner cylindrical surface, an inner conical surface and a stepped shaft end surface for grinding various shaft and sleeve type workpieces. Wait. The main components of PCBN Tools Grinding are the bed. The bed is the basic support of the grinder. The top of the parts will be equipped with the workbench, headstock, wheel frame, tailstock, etc. so that these parts will work. The exact relative position can be effectively maintained during the process, and the inside of the bed is used as an oil pool for hydraulic oil. Advantages of PCBN Tools Grinding 1. Tools Grinding The electric spindle lubrication is oil-lubricated. Compared with the oil mist lubrication method commonly used in similar machines, the lubrication flow control is more stable and more environmentally friendly. 2. The hydraulic pump adopts the variable frequency hydraulic pump, which is more energy-saving than the ordinary fixed-speed plunger pump used by similar machine tools, and the energy-saving rate is over 30%. 3. Machine tools, grinding wheels, rollers, and machining software make it easier to optimize product performance and provide users with grinding solutions. 4. The oil valve seat internal grinding machine has the same performance as similar machine tools and has the advantage of price and service. 5. Refer to the standard design and manufacture of the cabinet, the internal space is spacious, the size is reasonable, the heat dissipation is faster, and the system is stable. Reduces the aging speed of components and extends the use time of components. Technical Parameters of  PCBN Tools Grinding Spindle and Grinding Wheel The diameter of the Grinding wheel 150mm Grinding wheel center hole 40mm Power of grinding spindle 3KW Adjustable range of grinding speed(RPM) 1000~3,000RPM Servo motor swing, the adjustable oscillation frequency 0~50times/min Grinding wheel movement range(X ) 350mm Changeable Clearance Angle -5°~25° Tool work-head Max. Oscillation Range 30mm Max. Oscillation Frequency 60times/minute Table movement range  in the feed direction 130mm Work-piece rotation range in the axial direction 360° Linear scale resolution 0.001mm encoder resolution 1' CCD Monitoring System Max Magnification of Optical Microscope 0.7~4 times Magnification of CCD Measuring System, roughly 80times 12Industrial Displayer 12 “ Coolant Tank with Filter Paper About 70 L Power Supply and Dimensions Electrical Supply 12Kw Overall Dimensions L╳W╳H 1890╳1650╳1980mm Voltage Requested 380V/Three-phase /50Hz Weight With Coolant Tank 2000Kg
  • Treatment Of CBN Raw Materials

    Treatment Of Raw MaterialsThere are impurities such as WBN, HBN, pyrophyllite, graphite, magnesium, and iron in CBN micro powder. In addition, it and the binder powder contain adsorption oxygen, water vapor, etc., which is not good for sintering. Therefore, the purification of raw materials is one of the important steps to ensure the polycrystalline properties. During the development, we used the following methods to purify CBN powder and binder materials: first, CBN badge powder was treated with NaOH at about 300 C to remove pyrophyllite and HBN. Then perchloric acid was boiled to remove the graphite. Finally, remove the metal by boiling it on the hot plate with HCl and washing it with distilled water until neutral.Co, Ni, Al, etc. of the binder were treated by hydrogen reduction. Then mix CBN and binder in a certain ratio evenly into the graphite mold, into a vacuum furnace with pressure less than 1E2, heat 800~1000°C for 1h, remove the dirt on its surface, adsorption of oxygen and water vapor, so as to make the CBN grain surface very clean.In terms of the selection of binder materials and the amount of binder added, the total amount of binder added should be sufficient but not too much. The experimental results show that the wear resistance and bending strength of polycrystalline are closely related to the average free path (bond layer thickness). When the average free path is 0.8-1.2m3, the wear ratio of polycrystalline is the highest, and the incorporation of the binder is 10%-15% (mass ratio).In addition to the choice of binding agent, the determination of CBN particle size and particle size ratio is also crucial, the root of the machining precision and surface quality requirements, the manufacture of cutting tools used CBN particle size is roughly divided into coarse particle size 20~30 m. Medium size 3~10 microns. Fine 2 microns. It is difficult to make the tool with high precision with the coarse-grained polycrystalline, but it has high wear resistance and impact resistance.
  • Difference Between Natural And Artificial Diamonds

    The biggest difference between natural and artificial diamonds Natural diamonds are defined as having a depth of 200 km below the surface at extreme temperatures (approx. 1500).C) and at high pressure (about 50,000 atmospheres). But it is already possible to create the same conditions in a laboratory environment to produce synthetic diamonds. Jewelry processing is meticulous technical work, although the diamond is beautiful, the price is prohibitive. A team of us scientists has good news for diamond-lovers: they have created a synthetic diamond of comparable quality, which could one day be used on a large scale to produce diamonds of high quality and low price. When using traditional methods to generate diamonds, diamonds need high temperature and high pressure to "change color", which is expensive. In contrast, they used microwaves at low pressures to remove impurities at temperatures as high as 2,200 degrees Celsius. The process was more economical, cost-effective, and the diamonds contained fewer impurities and were of higher quality. The identification of natural and synthetic diamonds has become a priority. But this is harder than distinguishing forged diamonds. Natural and synthetic diamonds are made of carbon atoms and are arranged in the same crystal lattice, so they have the same physical properties. The only features are irregularities in the microstructure and atomic-scale lattice of crystals, known as crystal defects. In this respect, natural diamonds and synthetic diamonds are not identical due to different growth environments, such as chemical atmospheres and growth rates. Beijing Demina Precision Machinery manufactured BT-150H PCD &PCBN tool grinding machine for grinding artificial diamonds. It can grind angles and radii on standard and special turning and milling inserts, boring tools, grooving tools and many types of special turning tools.
  • CBN Tool Material Manufacturing Method

    CBN (Cubic Boron Nitride) was first synthesized in the 1950s by American general electric (GE) under high temperature and high pressure by the artificial methods. Its hardness reaches HV8000, which is second only to diamond (HV10000) and much higher than other materials. It and diamond are collectively known as superhard materials.CBN crystal and diamond crystal belong to sphalerite type, and the lattice constant is similar, the chemical bond type is the same, so CBN has the hardness and compressive strength close to the diamond, and because it is composed of N, B atoms, it has higher thermal stability and chemical inertia than diamond.CBN Tool Material Manufacturing MethodThe manufacturing method of CBN tool material is mainly the hot pressing method. The original material of pressing CBN single crystal powder — hexagonal boron nitrous oxide powder (HBN) is placed in the chamber of leaf wax, and the catalyst is added. With a hydraulic press with six or two heads, the CBN single crystal powder is formed under 1600℃ and 5 ~ 6GPa under 10min of hot pressing. Single crystal powder can be used in abrasives and abrasives. With the CBN single crystal powder plus catalyst and binder, at 1800℃, 5 ~ 6GPa under the pressure of 3 minutes can be obtained PCBN overall blade or composite blade (cemented carbide backing, there is 0.5mm left and right CBN thin layer).Demina tool grinding machine can grind the CBN tools with high quality.
  • Development And Features OF BT-150HG CBN Tool Grinder

    In an environment where the economic situation is increasingly uncertain. Our company's main customers are automakers, home appliance manufacturers, general industrial machinery manufacturers and other companies facing the global cost and quality competition. In this case, the tool grinder is required to have more reliable processing precision and low cost and high production performance. And there is a higher demand for shortening the product life cycle and diversifying the flexibility of the equipment. In order to meet the above requirements, our company has developed the CBN tool grinder for mass production of small shaft parts. Features of BT-150HG CBN tool grinder 1. Stable grinding accuracy The grinding wheel shaft, which is the heart of the grinding machine, is a hybrid type that combines dynamic and static pressure. No metal contact, no friction, long life. Its important feature is the high rotation accuracy achieved by high rigidity and low attenuation. Since its development, the company has been the pillar of the high precision of Demina grinding machines. 2. The industry's shorter processing beats achieves shorter processing tempo in the industry by increasing the rapid feed rate of the grinding wheel table and table. 3. Small footprint in the industry The device measures a width of 1,800mm and a depth of 2,400mm to achieve a small footprint in the industry. High-quality BT-150HG CBN tool grinder. In particular, maintenance space such as grinding wheel exchange is maintained on both sides of the equipment, taking into consideration space-saving and maintainability. 4. No need to change the type It is equipped with a side drive spindle that drives the workpiece through the top frictional forces on both sides. Thereby, the effect of full-length grinding of the outer diameter can achieve without driving the block. In particular, through the automatic tip distance adjustment function. It is possible to automatically correspond to workpieces of different lengths, and realize direct processing without changing the length of different workpieces. 5. Using a CBN grinding wheel to improve production performance By using the CBN grinding wheel, not only the trimming interval is extended, but also stable dimensional accuracy and surface finish are achieved. And the production performance is improved. BT-150HG CBN tool grinder can grind tool, which brings great convenience to users. 6. Simple operation The operation buttons are iconified, regardless of language, using icons that everyone knows. BT-150HG cutter grinding machine the texts display an icon display are easy to switch. As a visual system that can correspond to IoE, data such as current position and speed can sample at any time. Effectively early detection of equipment anomalies by comparison with normal values.  
  • PCBN Tool Material Performance

    PCBN Tool Material Performance(1) high hardness and wear resistance.CBN single-crystal microhardness of HV8000 ~ HV9000 is the second known high hardness material. The hardness of PCBN tool materials with different bonding amounts is between HV4000 ~ 6000, while the hardness of carbide tool materials is only between HV1100 ~ 1800.The hardness of Al2O3 ceramic tool material is HV2000. It can be seen that PCBN tool has higher wear resistance than cemented carbide and ceramic when used for processing high hardness materials, which can reduce the size deviation or size dispersion in the processing of large parts, and reduce the time for tool changing and adjusting, so as to give full play to its efficiency.(2) high thermal stability and high-temperature hardness.The heat resistance of CBN can generally reach 1400 ~ 1500 ℃, while the normal temperature hardness of Al2O3 / TiC composite ceramic is 800 ℃. When the cutting temperature increases, the processed material will soften. The hardness difference between the tool and the tool will increase, which is beneficial to the cutting process but has little effect on the tool life.(3) it has good thermal conductivity.The thermal conductivity of CBN is up to 1300W/ (m ·K), which is 3.5 times that of purple steel. The thermal conductivity of cemented carbide is only 35 ~ 75W/ (m·K). The thermal conductivity of CBN material is lower than that of the diamond, but much higher than that of cemented carbide. In addition, the thermal conductivity of the PCBN tool increases with the improvement of cutting temperature. So the heat at the tooltip can be transferred quickly, which is conducive to the improvement of workpiece processing accuracy.(4) high young’s modulus.The young’s modulus of PCBN is about 750GPa, higher than WC, TiC, Al2O3, and other materials.(5) has a small thermal expansion.The thermal expansion coefficient of PCBN is about (2.1 ~ 2.3) ×10-6/K, while the thermal expansion coefficient of cemented carbide is (5 ~ 7) ×10-6/K.(6) it has a small density.The density of PCBN is 3.48g/cm3, which is close to that of Al2O3 and Si3N4.(7) it has low fracture toughness.The fracture toughness of PCBN is about (3.5 ~ 5) Pa·m0.5, which is only half of that of ceramic tool materials. This is the only shortcoming of PCBN.(8) excellent chemical stability.CBN has a high antioxidant capacity, in the atmosphere, 1000℃ does not produce an oxidation phenomenon, PCBN in 1300 ~ 1500℃ is still no a solution. Not corroded in acid. It is inert to iron group materials and does not produce a biochemical reaction at 1200 ~ 1300℃.
  • Development Of PCD &PCBN Tools

    At present, with the rapid development of the market and technology, PCBN and PCD tools have been widely used. So the market puts high demands on the grinding efficiency of PCD and PCBN tool grinding equipment, the main performance is as follows. Development of PCD and PCBN tools 1. Can achieve large margin rough processing The integral PCD and PCBN tools can realize large margin rough machining. At present, the integral PCBN cutter can reach a depth of 8mm, can eat the entire blade, and the production efficiency is doubled. 2. High-speed cutting Thanks to the good performance of the PCD and PCBN tools themselves. High-speed cutting can be achieved completely, and it can perfectly combine with CNC machine tools, which makes high-efficiency cutting of workpieces greatly improve production efficiency. 3. Dry processing PCD and PCBN tools have higher hot red hardness. If the coolant is added, the blade will be cracked due to a sudden temperature drop. Therefore, PCD and PCBN tools generally use dry cutting when machining workpieces, especially in intermittent cutting. Dry turning is not only environmentally friendly but also saves a certain cost. 4. Suitable for processing high hardness materials The hardness of the PCD material is after the diamond and the PCBN is a very hard tool material that is second only to diamond. Therefore, the diamond tool is collectively referred to as a superhard tool. Normally, the PCBN hardness is better than 48HRC (the CBN wears very quickly when processing soft materials). The temperature is as high as 2000 ° C and there is excellent red hardness. Proper custom PCBN tools can withstand the high-power roughing of the cutting load, the interrupted cutting, and the heat and wear required for fine machining. In general, PCD and PCBN tools are currently the most ideal tool materials for processing ferrous metals. In the future, with the application of high-hardness and difficult-to-machine materials, the market share of PCD and PCBN tools will gradually increase. Become the mainstay of the hard materials processing industry. Beijing Demina Precision Machinery Co.Ltd has much more experience in manufacturing PCD & PCBN tool grinding machines for more than ten years in China. They can provide professional grinding solutions. Now they have developed a CNC diamond tool grinding machine, BT-150D, which is fully automatic. They developed their own grinding process, and it can grind diamond tools in bulk. For more information, please contact the company.
  • PCBN Tool Classification And Its Performance Factors

    PCBN tool materials and other types of tool materials, due to the composition of different, with many brands, suitable for different purposes. The performance of PCBN is related to the content, particle size, and type of binder of CBN. By adjusting the content, grain size, binder ratio and type of CBN, PCBN tools with different properties and different processing requirements can be obtained.PCBN Tool Classification And Its Performance Factors(1) PCBN tools can be divided into two categories according to the added components:One is directly made of CBN single-crystal hot pressing and sintering, CBN content is more (more than 70%), high hardness, suitable for heat resistant alloy, cast iron, and iron series sintering metal cutting and adding. The other is the hot pressing body formed by sintering CBN grain with a certain proportion of ceramic binder (mainly TiN, TiC, TiCN, AlN, Al2O3, etc.). This kind of PCBN has less CBN content (less than 70%) and lower hardness, which is suitable for the cutting of hardened steel.(2) there are three main types of the binder for PCBN:Metal binder, composed of metal or alloy, such as Co, Ni, etc., metal binder PCBN sintered body has good toughness and conductivity, the disadvantage is that under high-temperature binder softening, wear resistance decline. Ceramic binder, such as A1 203, etc., the sintered body of ceramic binder PCBN has a high resistance to high-temperature wear and loss and strong resistance to adhesion, which solves the problem of metal binder softening at high temperature, but its impact resistance is poor and brittleness is large. Cermet, such as TiN, TiC, TiCN, AlN, etc., solve the above problems and have better comprehensive performance.(3) PCBN cutter can be divided into:Overall PCBN hot pressing block and carbide composite hot pressing PCBN composite sheet. The overall PCBN blade is rigid, suitable for rough machining. The cost of composite PCBN blade is low, suitable for finishing, or semi-finishing.(4) existing studies have shown that the cutter prepared with pure CBN material cannot obtain the best processing effect in many cases. And the content of CBN is generally between 50% and 95%.The content of CBN mainly affects the hardness and thermal conductivity of PCBN. With the increase of the content of CBN, the hardness, wear-resistance and thermal conductivity of PCBN increase, while the toughness decreases. When the content of CBN is less than 50%, the hardness of PCBN decreases, leading to plastic deformation of cutting edge and blade breakage. When the content of CBN exceeds 95%, PCBN performance becomes poor, brittleness increases, CBN grain is easy to fall off, wear resistance is greatly reduced.Demina PCD tool grinding machine is can grind the CBN material with a fine finish.
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