Research On Structure And Control System Of FDM Material Transmission Mechanism

With the more requirements of high efficiency on product R&D, The rapid prototyping technology has been widely used. Fused deposition technology, as one kind of the rapid prototyping technology, has a persistent development and improvement. The most important advantage of FDM is that it doesn't use laser, therefore the cost is relatively low.There are three main problems need to solve in the FDM technology. The first is that the plastic wire is often blocked or parted in the process of transmission. The second is that the quality of some of the plastic material is not very good. The third is about the scan path.The project is about the plug and rupture problem in the process of wire transmission. Based on the research on FDM technology and CNC technology, the mechanical structure and control system of the material transmission mechanism is designed. It put forward the double motor driving method and hardware and software platforms to 32-bit microprocessor at the core base on ARM core. Modular hardware of the control system consists of stepper motor drive circuit, RS232 serial communication circuit, power circuit, USB interface circuit, etc. The software mainly involves SPI communication between STM32F103VB and stepper motor driver L9935 and the PWM (Pulse Width Modulation) speed adjusting for the stepper motor.The above-mentioned work solved the plug and broke problem happening at the wire transfer process. The wire can be smoothly transmitted into the heating block. The modular circuits make the system looks more clear. The employ of the stepper motor and the PWM speed adjusting method, makes it easier to control the speed of the wire transmission.