FREZY TRZPIENIOWE Z WĘGLIKÓW SPIEKANYCH MOULD AND DIE INDUSTRY NORTON WINTER PRECISION TECHNOLOGY TOOL GRINDING / 133 HONING STICKS Honing is classified as machining with undefined cutting edges using a tool where grits are bound together whilst maintaining continuous surface contact between workpiece and tool for improving size, form and surface. A periodic alteration of relative movements takes place between tool and workpiece, producing surfaces with parallel, criss-crossing grooves. In some cases a particular surface finish is required, for example to prevent the rupture of the lubricating film on cylinder liners. The advantages of diamond and cBN honing stones compared to conventional honing stones are • Longer service life • Better form stability • Closer tolerances • Cooler working, meaning no changes in the surface structure caused by thermal effects • Less distortion Diamond is exclusively used for honing workpieces, of all types of iron castings (cast iron, annealed cast iron and some cast steels). Cylinder liners for internal combustion engines are typical examples. cBN is primarily used for honing steel, e.g. machining steel, ball bearing steel, tool steel and alloy steel in all hardness conditions. To achieve the required surface quality, it is important to correctly specify all process parameters: The right grit type (diamond or cBN), grit size, grit quality, the bond and the concentration must be selected according to the workpiece material and the workpiece hardness. Furthermore, the required surface quality and material removal rate will determine whether the process should be carried out in one step or several operations. METAL BONDED HONING STICKS Item designation BZ08B With diamond-free zone Layer thickness X ≥ 1 layer width B ≥ 2 diamond-free zone S ≥ 0.5 layer length L ≤ 150 Item designation BZ08D Without underlayer Layer thickness X ≥ 1 layer width B ≥ 2 layer length L ≤ 150 Item designation BZ08E Including strip mount Layer thickness X ≥ 1 layer width B ≥ 2 layer length L ≤ 150 Tolerance at angle ß L3 ≤ 12.5: ± 15‘ L3 > 12.5: ± 10‘ 08B and 08D can only be used in conjunction with a strip mount. 08E is designed inclusive of strip mount for direct fitting.
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