PFERD Tools Main Catalogue NEJ.: 1488 - Sida 266
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Textversion PFERD Tools Main Catalogue Sida 266
Fine grinding and polishing tools Coated abrasives ➍ Abrasive grain Choosing the right abrasive grain has a significant influence on surface quality and profitability. The most common materials for abrasive grain are: Aluminium oxide A Numerous types of aluminium oxide are used as abrasives. These may be present in molten or sintered form. The hardness and toughness can be influenced by special manufacturing procedures or additives. Standard types of aluminium oxide and a "sharp-edged" grain shape are predominantly used for 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. Zirconia alumina Z Zirconia alumina is a fused mixture of aluminium oxide and zirconium oxide. In comparison to aluminium oxides, zirconia alumina exhibits lower hardness but greater toughness. The high proportion of zirconium oxide results in an extremely powerful self-sharpening effect and contributes to outstanding stock removal rates with cool grinding and a long tool life. Silicon carbide SiC Silicon carbide is synthetically manufactured abrasive grain which is very sharp-edged, with low toughness and very high hardness. It is particularly suitable for work on titanium, aluminium, bronze, stone and plastics. Ideally suited for use in the aeronautical industry, especially where SiC is the only approved abrasive, e.g. for use on engine components. Diamond grain D Diamond grain is the hardest abrasive. It consists of pure carbon in a crystalline structure. For grinding tools, the diamonds used are generally synthetic, produced at very high temperatures and under high pressure. The properties of diamond grain can be adapted for use in grinding tools through various synthesis conditions. 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. VICTOGRAIN VICTOGRAIN products are some of the most effective grinding tools in the world. PFERD's triangular, precision-formed abrasive grain achieves uniquely high abrasive performance. The VICTOGRAIN abrasive grain triangles are identical in shape and size and their cutting edges are applied to the workpiece at the optimum angle, meaning the grain needs very little energy to penetrate the workpiece. As such, the user benefits from an efficient machining process with fast working, a long tool life, less heat build-up in the workpiece, and a lower power output required for the tool drive. 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 optimal, constant performance during cool grinding and an extremely long tool life together with consistent workpiece surface roughness. Grit sizes The various grit sizes for coated abrasives are specified in ISO 6344 and have been adopted for FEPA standards: Coarse Medium Fine Superfine P 12 – 16 – 20 – 24 – 36 – 40 – 50 – 60 – 80 P 100 – 120 – 150 – 180 – 220 – 240 – 280 P 320 – 360 – 400 – 500 – 600 P 800 – 1000 – 1200 – 1500 ➎ Active grinding layer The use of an active grinding layer considerably increases the stock removal rate and reduces the workpiece temperature. This is especially advantageous for materials with poor heat-conducting properties, such as stainless steel (INOX). PFERD tools with an active grinding layer feature the additional "COOL" label in their item description. Page Catalogue 10 4
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