Some knowledge points about diamond grinding wheels

Oct 12,2021

The structure and shape of diamond grinding wheels are diverse and varied, with many peculiarities. Different industries have different requirements, and even within the same industry, there can be significant differences. The shape of the roller is determined by the circumferential shape of the grinding wheel or grinding wheel set. In other words, the application of rollers is in the forming grinding of machining grinding machines, which basically belongs to the latter type of process.

  Diamond grinding wheelThe structure and shape of diamond grinding wheels are diverse and varied, different across industries, and even within the same industry, there are many differences. The shape of the roller is determined by the circumferential shape of the grinding wheel or grinding wheel group. In other words, the application of rollers is for forming grinding in mechanical processing, which basically belongs to the latter process.


  Unlike diamond pencils or SBD powder dressing pens, they dress parallel grinding wheels to each other.


  Regardless of how complex the profile is, generally speaking, the structure of rollers is divided into three parts: diamond layer, steel core, and inner hole. This is also why key elements on the roller query table correspond to these three types of roller structures.


  Whether it is electroplated or sintered rollers, the working layer is the diamond layer. We can select corresponding diamond particle abrasives based on the abrasive material on the workbench. For the shape and size of the grinding wheel, we can design a corresponding steel core that supports the diamond layer and corresponds to the respective outer diameter size of the roller. The inner hole corresponds to the inner diameter and matches with the spindle of the roller installation device, requiring high precision. The precision of the inner hole corresponds to that of dressing wheels; therefore, tolerance requirements for inner holes are also quite strict.

       Diamond grinding wheel

  The abrasive particles and binders in rollers bear grinding forces and extrusion forces. These forces differ; thus, the state of particle breakage also varies. In other words, shapes, distributions, and densities of cutting edges differ as well. In summary, these differences are as follows:


  Grinding performance has a significant impact on workpiece shape and dimensional accuracy; selecting dressing conditions is also crucial for evaluating effective cutting volume.


  This is a necessary condition for using grinding wheels to dress rollers. Rollers are used to repair grinding wheels. Grinding machines are equipped with dressing devices. Some older grinders use diamond pens; however, many modern grinders have begun using diamond rollers for modifications.


  There are various influencing factors during use such as human factors, rotational speed, speed ratio, feed rate etc. Each manufacturer and craftsman does not have a unified standard; let alone different industries using different diamond rollers.


  So why can diamond rollers replace diamond pens?


  The appearance, size, and precision of diamond rollers are designed and manufactured according to relevant technical requirements for processed parts; installation dimensions are determined based on connection dimension requirements for dressing devices on user machine tools.


  Methods for making diamond rollers include manual sintering, random sintering, electroforming etc. Diamond roller dressers are used for grinding parts with complex shapes and high precision. Their main feature is combining multiple grinding processes into one operation to improve linearity in forming wheels significantly enhancing product quality while increasing production efficiency.


  Diamond grinding wheelThrough production experience, our natural diamond rollers are all made by manually arranging implanted diamonds through burning. Diamond rollers produced this way have characteristics such as high profile accuracy in dressing operations, good forming capability, fast dressing speed, high efficiency, simple operation and long service life which can ensure consistent shape and accuracy in batch processing parts.


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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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