Modeling the cutting force in wood sawing with different radial clearance angles based on a response surface methodology

Wood sawing is a closed cutting process. The side edges are involved in wood sawing and the influence of the radial clearance angle becomes particularly important. To explore the influences of the side edges on the cutting force in the wood sawing and quantify it, this study with Pinus sylvestris (pinus) and Fraxinus mandshurica (ash) as samples, used the four factors three levels of BBD test Design in the modeling response surface methodology for a cutting force experiment that was carried out with a single sawtooth having different radial clearance angles. The multiple response surface regression model of a cutting force was established by considering the effects of radial clearance angles, cutting thickness, moisture content, and rake angle. Results using the response surface methodology showed that the multiple regression mathematical model of the cutting force had a high accuracy and reliability (R2=0.92 and R2=0.94). The radial clearance angle had a certain impact on the cutting force in wood closed cutting. Also with an increase in radial clearance angle, the cutting force decreased slowly. Overall for both kinds of wood, cutting thickness had an extremely important impact on cutting force, followed by the rake angle, then wood moisture content, and finally the radial clearance angle.