By R Edwards
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There is no linking of the chip to the insert and so friction is much reduced. This in turn means that temperatures are less than with uncoated inserts. 7 WHY DON'T COATINGS BREAK? As already stated the materials which form the coatings are extremely hard, TiN is > 2600 VDH, TiC and Al203 are> 2800 VDH. With a coating, unlike hardmetal, there is no softer, tougher binder to 'cement' these hard materials. The secret behind their ability to stand up to the cutting loads is a combination of the thickness of the coating and the compressive strength of the substrate on which it is deposited.
It identifies the tolerance on thickness and on the inscribed circle dimension. By definition one of the main features of indexable inserts is that 30 Cutting Tools when they are worn they can be turned to a new position and cutting can recommence because the insert has indexed to the same position it held previously. 2 mm. However, for precision turning or for milling, the inserts need to be more accurate and must index so that the cutting edge is repositioned exactly each time. All indexable inserts are made by a powder processing route and with good pressing technology it is possible to perform roughing and semi roughing operations with inserts which do not have to be ground on the periphery to a smaller tolerance size.
However, their real advantage is that they will cut at faster speeds than uncoated hardmetal inserts and therefore produce considerably more components in a given time. With the expensive machine tools in use today this has a big effect in reducing production costs. Another advantage of coated hardrnetal inserts is that each grade has a broader application range than the equivalent uncoated insert. This can reduce the need to stock a wide range of grades. The coatings and substrates can be optimised to cope with the problems arising in any machining task.