Abstract: Gradient distribution exists widely in biological materials. Gradient materials can withstand large forces and thermal shocks and are widely used in high-temperature and high-pressure environments. It is very difficult to make gradient materials by traditional technology. 3D printing technology and experimental equipment for gradient distribution materials including gradient modeling, control systems and printing machinery are designed. Based on the image gray changes, a modeling method for material composition gradient is established. Based on the motion controller, a 6-axis linkage system including X,Y,Z three-dimensional spatial position axes and U,V, and W material extrusion axes is designed. It has functions such as motion trajectory planning and continuous interpolation. Software and hardware of the control system are developed to achieve coordinated control of material proportioning and three-dimensional motion. A 3D Printing mechanism is constructed using piston extrusion, dynamic mixing, and a linear 3D platform design. The developed experimental equipment is used to perform gradient distribution printing experiments using different color materials, and the feasibility of the developed experimental equipment to print gradient distribution materials is verified.

Key words: gradient distribution, 3D printing, motion controller