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Buying diamond and CBN grinding wheels can not be called "commodity." Poor quality wheels may damage your valuable work-piece, cause production delays and raise total grinding cost. With so many manufacturers offering seemingly identical products, how can you distinguish good ones from bad? Zhengzhou Ruizuan Diamond Tool Co.,Ltd. has served industries to avoid this expensive mistake since 2014, here are 5 crucial parameters should be inspected before ordering next diamond CBN wheels.
Abrasive Grain Quality and Consistency
The function of the diamond or CBN wheels lies with abrasive grain. Low quality wheel utilizes inconsistent grains or improper grades, grains are not the same on size, shape and strength. It will create inconsistent cutting, unpredictable wheel life and poor surface finish.
When evaluating manufacturer, ask about their sourcing for grain and its quality. High - quality diamond and CBN grains must be manufactured under strictly controlled conditions to ensure consistent morphology and thermal stability. Leading manufacturers like Ruizuan always test grains every batch for hardness, toughness and size distribution. Suppliers who don't have proof for grain quality or use low-quality grains from unreliable source are best to avoid.
Bond System Compatibility with Your Application
Bond system holds abrasive grains and determines its exposure with wheel wear. Selecting improper bond system will surely lead to low wheel performance. Resin bond, metal bond, vitrified bond and electroplated wheels are designed for different applications.
Resin bonded wheels have perfect performance in finishing and surface grinding where low grinding force is needed. Metal bond wheel has outstanding grain retaining feature for roughing and profile grinding. Vitrified bond is good for high production and freely cutting. Most low quality wheels use a generic bond formula which does not suit the application and the result will be early grain pulling-out or bond wear-off. A professional manufacturer should be able to recommend a bond system base on workpiece material, hardness, grinding machine type and requested material removal rate.
Concentration and Grit Size.
Concentration is the percentage volume occupied by the diamond or CBN grains within the wheel working layer. It should be from 75% for finishing wheels to 150% for heavy duty or roughing wheel. Cheap wheels are produced with lower concentration levels to reduce manufacturing costs, causing them to wear quickly and perform inconsistently. Grit size has to match with surface finish requirement and material removal. Coarse grits (B46-B76 for CBN; D46-D76 for diamond) remove materials faster and generate rougher finish; Fine grits (B91-B126 and more; D91-D126 and more) generate finer finish but remove slower. Suppliers that cannot specify grain sizes properly or that offer mixed grain sizes are often low - quality suppliers. Ask for specification and sample for testing, and then consider placing order.
Wheel balance and tolerances
Wheel imbalance leads to vibration and affects wheel accuracy as well as surface finish of work piece and damage to grinding spindle, the result is wheel wears unevenly. A high quality CBN and diamond wheel is dynamically balanced to the required ISO or ANSI standards. Wheel runout tolerances should be specified and validated.
Ask for balance grade certification and the wheel's runout measuring data before placing an order. Most low quality wheels don't even have balancing or use basic static balancing methods which are not precise enough. Each Ruizuan wheel is strictly tested on both balancing and runout at each manufacturing step and will be discarded if it does not meet the required specification.
Certification and Traceability
An unwilling-to-provide any documentation for certification and traceability usually indicates a low-quality manufacturer. Good manufacturers track all processes starting from incoming materials to final product inspection. ISO 9001 should be the basic certification, while other specific certifications like CE, SGS or TUV could be required for aerospace, medical and automobile industries.
Inquire about batch specific testing reports including abrasive grain analysis, bond hardness test, balance testing records and dimensional measurement for quality verification. Ruizuan always provide full traceability for every CBN and diamond wheel, with certifications complying with international standards. If supplier is unable to provide documentation, this is nearly a certainty they are low-quality supplier.
Summary
In summary, a low-quality diamond CBN wheel will bring the expensive damage to work-piece, lost time and raise total cost. Paying attention to the five key parameters mentioned above will help you avoid that expensive mistake when you buy diamond CBN wheel: abrasive grain quality, bond system compatibility, concentration and grit size, wheel balance and tolerance, as well as certification and traceability. Zhengzhou Ruizuan Diamond Tool Co., Ltd has already served all industries around the world by supplying the reliable high performance grinding wheels since 2014. Ruizuan CBN and Diamond wheels are manufactured under CE, SGS, TUV and ISO 9001 certificate control, please contact us for a proper consultation and select the diamond CBN wheels which are best suitable for your grinding applications and avoid expensive mistakes.