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Ultraprecision Machine System Lab.

Research

Research

Grinding of Brittle materials

Effect of hydrodynamic pressure on ultraprecision grinding

The purpose of process measurement and metrology in manufacturing is to examine whether the machined parts were made according to the designer’s specification. In the case of machining using a machine tool, a general metrological device such as coordinate measuring machine (CMM) is commonly used as a method for machine-performance in order to assess dimensional tolerances.This research deals with a new grinding method which adopts a toothed geometry on the grinding wheel for decreasing the hydrodynamic pressure on grinding arc thereby improving surface roughness of a ground surface.

Usually, during the grinding process, the fluid generates hydrodynamic pressure which increases grinding resistance which is larger than the net grinding force in extremely small cutting depth. Furthermore, this hydrodynamic pressure worsens wheel rotational balance which affects ground surface topography. Therefore, in this research, new wheel geometry, specifically tooth shape, is studied on the point of decreasing hydrodynamic pressure effect. The studied wheel geometry is effective not only on decreasing the hydrodynamic pressure but also improving surface roughness.

sub030107_img01 Fig. 1 Hydrodynamic pressure generation
sub030107_img02 Fig. 2 Grinding with a toothed wheel

LSMF-400 (Machine tool for Micro Feature on Large Surfaces)

The machine tool for micro feature on large surfaces is held in our lab. This machine tool consists of 4-axis stage and air spindle. Hydrostatic bearings are used for all axes and pneumatic cylinder is used for vertical axis. In addition, ultraprecise control, which is Nano order resolution, is possible by hydrostatic bearing and linear scale. Therefore, this machine can be used for various cutting applications: Shaping, Milling, Turing and so on

sub030107_img03 Fig. 1 Machine Tool (LSMF-400)
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