Review of the opaque coolant barrier removal techniques for inprocess form profile optical measurement

摘要

In-process measurement can provide feedback for control of workpiece precision in terms of size, form error, androughness. It can be used for precision control of a machining process, therefore to improve productivity and reduce defectrates. Optical measurement methods have greater advantages in the in-process form profile measurement systems due totheir non-contact type and high precision. However, use of opaque coolant in precision machining will introduce an opaquebarrier problem, making the workpiece surface y(x, z) inaccessible to the optical measurement devices. To solve thisproblem, several approaches, including the water beam approach, the single air beam approach, the multiple air beamapproach, and the dual coolant displacing medium method, are examined in terms of coolant removal capability, level ofacceptance to surface complexity, flow rate and velocity of the coolant displacing media, and also errors induced by thecoolant removal methods. The results of the study show that the multiple air beam method and the dual coolant displacingmedia method are more advantageous than the other methods.