PFERD Tools Main Catalogue Page 270
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Fine grinding and polishing tools Coated abrasives Ceramic oxide grain CO For sintered aluminium oxides, a differentiation is made between sintered bauxite aluminium oxides and sol-gel aluminium oxides. Sol-gel aluminium oxides are predominantly used for coated abrasives in the form of abrasive ceramic grain. This state-of-the-art abrasive is used for numerous applications thanks to its high toughness and good self-sharpening qualities. Compact grain CK In the case of compact grain, individual grains are built up as granulate with a bond system. Each individual grain of granulate is one solid unit, in which numerous abrasive grains made from aluminium oxide or silicon carbide (SiC) are joined together. Used abrasive grains are torn out of this compound structure by the forces resulting from the grinding, and expose sharp abrasive points in doing so. This guarantees a long tool life with a constant surface quality. 4 Grit sizes The various grit sizes for coated abrasives are set out in ISO 6344 and have been adopted in FEPA standards. Coarse P 12 – 16 – 20 – 24 – 36 – 40 – 50 – 60 – 80 Fine P 320 – 360 – 400 – 500 – 600 Ultra-fine P 800 – 1,000 – 1,200 – 1,500 Medium P 100 – 120 – 150 – 180 – 220 – 240 – 280 ⑤ Active grinding layer The use of an active grinding layer significantly increases the stock removal rate and reduces the workpiece temperature. This is particularly advantageous for materials which conduct heat poorly, such as stainless steel (INOX). PFERD tools with an active grinding layer have the suffix “COOL” in the item designation. Page Catalogue 10 4 VICTOGRAIN The triangular, precision-formed VICTOGRAIN abrasive grain achieves uniquely high abrasive performance. The VICTOGRAIN abrasive grain triangles are fixed to the substrate on one of their sides. This means they are securely fixed in place and, together with their slim design, offer an extremely large chip space in order to further improve machining efficiency. The structure of the triangular VICTOGRAIN has also been specially adapted to maximize results. The very small crystals inside the triangles ensure optimal wear characteristics as sharp cutting edges are always exposed, but only the minimum amount of abrasive grain/ the triangle breaks off. By combining all these properties together, users benefit from the ultimate, constant performance during cool grinding and an extremely long tool life together with consistent workpiece surface roughness.
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