As we all know, the high wear of cemented carbide tools leads to difficulties in resharpening and affects the machining quality of precision parts.
As we all know, the high wear of cemented carbide tools leads to difficulties in resharpening and affects the machining quality of precision parts. Due to different workpiece materials and different cutting materials, normal wear of cemented carbide tools occurs in the following three situations:
1. Back side wear
Back side wear Only the part of the wear occurs mainly on the sidewalls. After wear, it forms a facet with αo ≤ 0o and its height VB indicates the degree of wear. This type of wear is generally used when cutting brittle metals or when cutting plastic metals at low cutting speeds and small cutting thicknesses (αc < 0.1 mm). arrive when. At this time, the mechanical friction on the rake face is small and the temperature is low, so the wear on the flank face is relatively large.
2. Wear the rake face
The wear of the rake face means that the proportion of wear occurs mainly on the rake face. In general, when cutting plastic metal at high cutting speed and large cutting thickness (αc > 0.5 mm), chips flow from the rake face. Friction, high temperature and high pressure crush the chips on the rake face close to the cutting edge. croissant. The rake face wear is expressed by the sickle depth KT. When machining precision parts, the sickle gradually deepens and widens, widening towards the cutting edge, even causing chipping.
3. The leading and flank surfaces are worn together.
Simultaneous face and flank face wear refers to the simultaneous wear of the rake face and flank face on the carbide tool after cutting. This is the most common form of wear that occurs when cutting plastic metals at moderate cutting speeds and feeds.
The total cutting time of the carbide tool for machining precision parts after sharpening until the amount of wear reaches the wear limit is called the carbide tool life, i.e. the pure cutting time between the two operations of resharpening the carbide tool Integrated to meet the one marked "T". With the same wear limit, the following applies: the longer the life of the carbide tool, the slower the wear of the carbide tool.
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