Key points for using diamond grinding wheels

Oct 13,2021

Diamond grinding wheels are high-precision dressing tools made by coating a layer of diamond particles on the tooth surface of a gear-shaped steel substrate. They can be used for dressing grinding tools such as grinding wheels and honing wheels. Diamond wheels are one of the various ultra-hard dressing wheels with high precision and complex profiles, and their manufacturing errors will be amplified onto the workpiece after secondary processing.

   In gear processing, honing is traditionally considered a surface finishing method for hard tooth surface gears, mainly used to improve the surface finish of the teeth. However, in recent years, in industrially developed countries such as Switzerland and Germany, due to the adoption of high-precision gears.Diamond grinding wheelThe shaping of honing wheels has greatly improved honing precision, making the honing process widely used in the finishing process of hard tooth surface gears.

 

  The gear diamond grinding wheel is a high-precision dressing tool made by coating a layer of diamond particles on the tooth surface of a gear-shaped steel substrate. It can be used for dressing grinding tools such as grinding wheels and honing wheels. The diamond wheel is one of various ultra-hard dressing wheels with high precision and complex profiles, and its manufacturing errors are amplified onto the workpiece after secondary processing. The shaping method of the honing wheel inside the gear diamond shaping roller is exactly the same as that for processing the workpiece, only replacing the workpiece with a shaping roller while dressing both the tooth surface and root of the honing wheel. The dressing time is the same as that for honing workpieces. The rotation speed of the honing wheel is lower than that of processing speed, with each dressing amount being 0.01 to 0.05 millimeters. After dressing, the honing wheel can achieve better precision and self-sharpening.

       Diamond grinding wheel

  The diamond wheel dressing uses grinding methods for shaping, while diamond pen dressing uses turning methods for shaping; therefore, the former has greater dressing force than the latter, requiring sufficient torque from the motor. The power of edge trimming motors is calculated at 15 to 30w/mm width, with a motor power of 1KW. Considering specific motor structure and machining parts width (65 mm), a motor power selection of 1.5kW is made.

 

  The emergence of diamond wheels provides conditions for profile grinding and profile sharpening. By installing driving devices on grinding machines and using complex profiles with high-precision diamond wheels, efficiency can be improved while processing complex and precise parts accurately. Therefore, roller technology not only applies to cutting-edge fields such as aerospace but also has extensive application value in ordinary civilian production. Due to their advantages such as high precision, strong dressing capability, and long service life, rollers are also very useful in sharpening ultra-hard abrasive grinding wheels, providing conditions for their application in profile grinding.

 

  Profile grinding is a high-precision and low-cost finishing method that shapes grinding wheels into forms consistent with workpiece profiles; it replicates this profile when there is sufficient contact between the wheel and workpiece. In profile grinding, different circumferential speeds at various points on the wheel lead to varying material removal rates at those points resulting in uneven wear on the wheel—especially at sharp corners where breakage can easily occur causing shape errors. Since part forming shapes replicate those of grinding wheels directly affecting machining accuracy uneven residual material will also lead to defects during processing.Diamond grinding wheel's dressing has a decisive impact on profile grinding processes.

 

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Using diamond grinding wheels to dress the grinding wheel, the profile is opposite to the required wheel profile, and it moves in the same direction as the wheel being dressed, shaping the wheel into the desired form. The dedicated grinding machine for lock clamps uses diamond wheels to dress the grinding wheel, which is then used to grind valves. The diamond wheels we use are coated with a layer of uniformly distributed diamond particles on a steel substrate through electroplating. When using them, two points must be noted: First, when loading and unloading the diamond wheel, gently tap with a copper rod to prevent diamond particles from falling off. Second, before dressing the grinding wheel with the diamond wheel, it is essential to adjust the relative position of the diamond wheel and grinding wheel in manual mode. For example: The automatic compensation amount for J4-048 lock clamp grinder is 0.01mm with a compensation amount of 50mm. To meet this compensation amount, a grinding wheel grit size of 120# is generally selected. When grinding lock clamp grooves, we dress the grinding wheel once every 20 products, taking 30 seconds for dressing time and maintaining a dressing line speed ratio of 0.59. Sampling tests show that surface roughness Ra is between 0.63 and 1.25μm, and shape and positional accuracy are within 0.03mm, fully meeting customer requirements. Practice has proven that one diamond wheel can produce 60,000 to 80,000 qualified products. The precision of lock clamp grooves mainly relies on the accuracy of the diamond wheels. As a core component of lock clamp groove grinders, the design of its profile is particularly important. Using diamond wheels produced by Dongjin in Henan for dressing grinding wheels ensures high precision and long service life while achieving good surface roughness in workpiece processing, making it especially suitable for mass production.

Mar 18,2022


Researchers in Australia have made breakthrough progress using the power of diamonds, potentially revolutionizing the way the human body accepts biomedical implants. Researchers from RMIT University successfully coated 3D printed titanium implants with diamonds. This is the use of 3D printed diamond implants for biomedical and orthopedic applications, involving surgeries related to the human musculoskeletal system. Although titanium provides a fast, accurate, and reliable material for medical-grade and patient-specific implants, our bodies sometimes reject this material due to compounds on titanium that prevent effective interaction between tissues and bones with biomedical implants. Synthetic diamonds offer a cost-effective solution to this problem. This breakthrough was achieved by biomedical engineer Dr. Kate Fox and her team at RMIT's School of Engineering. The coating was produced using a microwave plasma process at the Melbourne Nano Manufacturing Centre. The combination of titanium scaffolds with diamonds forms a biomaterial. "This technology will take several more years to launch; many steps need to be taken before it can be used by patients," Fox said. "But what we have done is a key step in a long and incredible journey." Postdoctoral researcher Aaqil Rifai is collaborating with Fox on this new technology research, stating, "Diamonds are very effective because carbon is a major component of the human body. Carbon has incredible biocompatibility." Rifai added, "Our bodies easily accept diamonds and use them as platforms for complex material interfaces." In addition to orthopedics, diamonds are also used to coat cardiovascular stents—catheters that help keep heart arteries open—as well as in bionics and prosthetics. Currently, researchers are focusing on how to apply this technology in orthopedics. "3D printing is a groundbreaking revolution in modern times. Through 3D printing, we can design specific medical-grade implants. This technology is fast, accurate, reliable, and labor-saving," Rifai said: "The scalability of 3D printing is rapidly increasing; therefore, we can foresee that diamond coatings will become increasingly common in orthopedics in the near future." Diamonds are one of the special materials found in nature with properties such as hardness, low friction coefficient, high elastic modulus, high thermal conductivity, high insulation properties, wide bandgap, high sound propagation rate, and good chemical stability. Although natural diamonds possess these characteristics, they have only existed as gemstones; their variability and rarity greatly limit their applications. However, CVD diamond films prepared by Luoyang Yuxin Diamond combine these excellent physicochemical properties at a lower cost than natural diamonds and can be fabricated into various geometric shapes with broad application prospects in industries such as electronics, optics, and mechanics.

Aug 16,2021


In June 2020, China's foreign exchange for bearing imports was $368 million, an increase of 10.13% month-on-month and a year-on-year increase of 34.64% compared to June last year, with an increase of 26.47 percentage points from the previous month's growth rate of 8.17%. The number of bearing imports reached 191 million sets, a month-on-month increase of 3.74%, a year-on-year increase of 26.61% compared to June last year, and an increase of 22.61 percentage points from the previous month's growth rate of 4%. As of June 2020, China had accumulated foreign exchange for imports totaling $1.907 billion, which is a year-on-year increase of 12.37%. This is an increase of 4.27 percentage points from last month's rate of 8.1%. The number of imported bearings was 1.151 billion sets, an increase of 15.31% compared to the same period last year, and an increase of 2.02 percentage points from last month's growth rate of 13.29%. From the perspective of imported bearing categories, the foreign exchange for tapered roller bearings increased by 45.98% year-on-year, becoming the main driver for bearing import foreign exchange; followed by bearing parts with a year-on-year growth rate of 25.3%, other ball bearings with a growth rate of 23.24%, cylindrical roller bearings with a growth rate of 15.39%, and spherical roller bearings with a growth rate of 13.73%. It is not difficult to see that under the new situation, significant changes are occurring in the structure of the bearing market. From the perspective of importing countries, foreign exchange from Japan reached $490 million, ranking first with a year-on-year growth rate of 4.61%. Germany ranked second with $420 million in foreign exchange for imports but had a remarkable growth rate of 28.31%. Surprisingly, Taiwan's import foreign exchange for bearings reached $137 million, ranking third with an astonishing year-on-year growth rate of 346%. This indicates that as China's economic structure adjusts, significant changes are also occurring in the market for importing countries for bearings.

Aug 27,2021


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