Abstract Mitsubishi Materials has developed a cutting tool manufacturing technology using lasers, which contributes to precision machining in various industrial fields such as automobiles and electronic components. According to Mitsubishi materials, the grinding tools have been used to mechanically process cutting tools, but the grinding wheel is small...
Mitsubishi Materials has developed a cutting tool manufacturing technology using lasers, which contributes to precision machining in various industrial fields such as automobiles and electronic components.
According to Mitsubishi materials, the cutting tools have been mechanically processed in the past, but the grinding wheel has a limit on miniaturization and the size of the cutting tool is limited. In addition, when processing CBN (cubic boron nitride) sintered body and difficult-to-machine materials such as diamond, it can only be processed by the same cBN sintered body and diamond grinding wheel. At this time, the grinding wheel will wear and deform quickly, and it is difficult to guarantee. The dimensional accuracy of the machined tool.
Original machining (left) and machining using laser (right)
Example of a square end mill for CBN sintered body (with a cutter head diameter of 0.3 mm)
This laser cutting tool processing technology uses laser concentrating to achieve a smaller concentrating diameter than tens of μm that can be achieved by machining, and it does not cause wear like a grinding wheel, so there is no need to adjust it during processing. In addition, it is not necessary to apply an external force to the object to be processed during the machining, so that no strain is generated, and the dimensional accuracy of the machined tool can be ensured.
By using this technology, when processing difficult-to-machine materials, not only can planar processing be performed by simple cutting, but also a three-dimensional machining with a certain depth can be realized, so that a cutting tool having a free shape and a fine sharp blade can be manufactured. In the future, Mitsubishi Materials will apply this technology to cutting tool products such as small-diameter end mills that use cBN sintered bodies.
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