Study on the evaluation method for finished surface based on human visual characteristic

摘要

In the machining of molds and dies, it is quite important that the finished surface have no visible glitches. The purpose of this study is to develop the evaluation method for finished surface based on the human visual characteristic. In order to achieve the purpose, visual resolution and recognition limit of normal vector changes of the machined shape are investigated. The visual resolution of the human eyes is evaluated based on tool marks on the machined surface. The recognition limit of normal vector changes is evaluated based on the workpiece which has normal vector changes in its shape or surface profile. An evaluation method for the finished surface is proposed based on the investigated characteristics. In order to confirm the usability of the proposed method, evaluation tests of actual machined surfaces influenced by the machine tool motion errors are carried out. As the results, it is clarified that the proposed method can accurately evaluate visibility of the glitches on the machined surface.