Tool thermal deformation measurement research based on image processing technology

Aiming at the problem of tool deformation during machine preheating, a tool thermal deformation measurement scheme based on image processing was designed to analyze the relationship between the position change of tool axial due to thermal error and the preheating time.High speed camera was used to collect tool images, and canny algorithm was used to extract rough positioning of the edges of the images combined with matlab software. Subpixel fitting edge detection method was used to precisely locate the tool edge contour, that is, the least square method was used to fit the tool tip curve and calculate the size of tool deformation. The accuracy of tool deformation measurement can reach micron level.