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Understanding Grinding Wheel Hardness. The amount of abrasive bond in the grinding wheel determines its grade or hardness. Hardness is dependent on the grit type, the material being ground, the amount of stock removed, and a number of other factors. Hardness is rated from A-Z, with “A” being the weakest bond and “Z” being the strongest.
Grinding wheel selection, pay attention to the appropriate hardness, if too hard, blunt abrasive particles do not fall off in time, will produce a lot of heat, burn the work-piece; too soft wheel, it will make abrasive off too fast and can not fully play its role.
Grade of Grinding wheel: The grade refers to the harness or strength with which the bond holds the abrasive grains of a grinding wheel in a place. The Grade is indicated by the English alphabet A to Z. A denotes Sofest and Z denotes Hardest Grade.
A wheel is said to have a soft grade if only a small force is needed to release the grains. It is the relative amount of bond in the wheel that determines its grade or hardness. Hard grade wheels are used for longer wheel life, for jobs on high-horsepower machines
For this reason, finer grit sized wheels are required to grind hard materials and soft materials are best ground with medium to coarse grit size wheels. For most efficient operation, the grade must be adjusted to suit the hardness of the material. As a general guide, the harder the material, the softer the grade of wheel required.
Grade affects almost all considerations of grinding, such as wheel speed, coolant flow, maximum and minimum feed rates, and grinding depth. Hardness testing can use testing equipment,if you want to compare two grinding wheels hardness,you can use one grind another one,the ones which abrasive grains was separated from the wheel,it is the softer ones.
Grade affects almost all considerations of grinding, such as wheel speed, coolant flow, maximum and minimum feed rates, and grinding depth. Grain spacing [ edit ] Spacing or structure, from 1 (densest) to 17 (least dense).
You can use the grinding wheels of aluminum oxide, silicon carbide, cubic boron nitride, and diamond as under: Type of abrasive. Knoop Hardness. Typical Usage. Aluminum oxide. 2100 HK. Ductile materials like steel and other high alloy materials. Can be used for cast-iron also. Silicon carbide.
Indian Standard Coding system of grinding wheel is IS : 551-1954. It provides uniform system of coding of grinding wheels to designate their various characteristics. It gives a general indication of the hardness and grit size of any wheel as compared with another
Grinding is a machining process improving the surface finish of the job and producing small chips. The tool used for this process is the grinding wheel. It is a cutting tool in which millions of microscopic abrasive grains are bond together. Here, each abrasive grain acts like a spiky tool. As shown in the image, the abrasive grains are held
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