Unique high precision radial side milling (2)
In general, the positioning and clamping of the indexable insert on the body is critical to processability and results. The CoroMill 790 blade is connected to the body by a toothed interface for precise positioning and prevents any slight movement of the blade. The blade is not in contact with the side wall of the insert seat, and the cutting force from all directions and the centrifugal force received at high speed are received by the interface. Open positioning allows the chips to drain smoothly. The accuracy of the toothed interface ensures that the cutting edge is in the correct position in the tool and minimizes the radial runout of the tool caused by the blade error.
Light cutting
The brisk cutting action of the CoroMill 790 is another success factor. Similar to the original design for non-ferrous metal cutting, the new inserts for ISO P, M, K, and N materials also have a positive rake geometry, which results in low cutting power consumption and high metal removal rates. The 790 blade for machining ferrous metals is sharp enough to cut normally when the radial depth of cut (milling width) is small (the chip thickness is small at this time), so that the radial force generated is small, and of course the deflection of the tool Minimal, this is necessary for high-precision cutting (especially taper and good surface quality).
With the new PVD coated grade GC1030, the perfect combination of positive rake angle, sharp cutting edge and strength and durability is achieved. This insert grade is particularly suitable for end milling, which has the wear resistance and edge strength required for small diameter tools or under unstable conditions. The versatility of this grade makes it ideal for use with CoroMill 790 for cutting harder ferrous materials.
Finishing ability
The CoroMill 790's sharp cutting edge successfully removes machining allowances as low as 0.01mm. This is very useful when finishing holes, but at this time, the traditional file will not work due to insufficient cutting edge. The CoroMill 790 tool achieves high roundness and typical applications guarantee roundness tolerances in the 6 micron range. It should be noted that the roundness of the hole at this time is largely determined by the performance of the machine.
The radial depth of cut when milling with CoroMill 790 is typically less than 1 mm. For finishing, the applicable depth range is between 0.25 and 0.5 mm.
Under normal circumstances, the processing accuracy is stable to reach IT8 is no problem; if the entire process system is in good condition, the machining accuracy can reach IT7; if the whole process system condition is optimal and the processing parameters are further optimized, the machining accuracy can reach IT6. If the system is rigid enough, the surface roughness when milling with the CoroMill 790 tool can be kept within Ra 0.25 microns.
How productive is it?
Earlier, the advanced basic concept of the CoroMill 790 right-angle milling cutter made it the perfect choice for high-precision and efficient machining of aluminum alloys. Nowadays, the new indexable insert geometry and coating grades continue to evolve to make it possible to handle other workpiece materials. When only roughing and semi-finishing are required,
The combination of CoroMill 490 and CoroMill 390 enables machining in many applications. Especially in the mixed production of a variety of processing applications, the use of universal milling cutters can give full play to the advantages of modern CNC machine tools in the ability to process various features such as step faces, sides, various contours, bosses and holes. The use of helical or circular interpolation reduces the need for different diameter boring tools.
Finishing of external bosses is called “outer boring†and often requires expensive non-standard solutions unless a solid carbide milling cutter is used. However, the long cutting edge of the solid carbide end mill due to its direct grinding requires not only a particularly stable and accurate clamping, but also the flexibility of the multi-section curved cutting edge of the Wiper insert. Therefore, solid carbide tools are more suitable for smaller circles that cannot be covered by indexable tools.
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