Abstract:

Robot grinding system can replace the inefficient and polluting manual polishing operation, reducing the preparing time for production and equipment cost, especially suitable for the grinding of small batch of curved-surface parts. As a result of contact wheel with elastic material, there is a flexible contact between work piece and tool, favoring the work piece’s surface quality. However, grinding depth is hard to control because the contact wheel is easily to deform. The impact of belt tension about the contact wheel’s deformation and cutting depth is analyzed. The elastic mechanics of complex variable function method is introduced to establish and solve the contact model, so the displacement and pressure distribution of the contact wheel can be obtained. Compared with the results of commercial finite element software, the validity of the model is verified. A new model based on the modified grinding model is developed, and the distribution of the grinding depth is established. The experiments show that modeling error is less than 3.1%. It can be more accurately and faster to predict grinding depth, providing a theoretical guidance for improving the grinding accuracy.

Key words: contact wheel, cutting depth, deformation, robotic machining, belt grinding