Study on Furnace Temperature Curve Based on Heat Conduction Model

Temperature control is very important to product quality in circuit board welding production of reflow furnace. In this paper, the mathematical model is used to analyze the temperature change in the center of the welding area of the circuit board in the reflow furnace, simulate different conditions, determine the optimal furnace passing speed of the conveyor belt, complete the temperature setting of each temperature zone, and gradually study the furnace temperature curve to solve the problem. This paper first discusses the structure and working principle of the reflow furnace. It is clear that the influencing factors of the furnace temperature curve are temperature zone temperature and furnace passing speed. The furnace temperature curve is drawn using the attachment data as the reference standard. The heat conduction model was established. The finite difference method was used to simplify the solution. On this basis, this paper changes the temperature value set in each small temperature zone, applies the heat conduction difference equation, takes the process boundary as the constraint condition, and takes the conveyor belt passing speed as the optimization goal to establish a single objective optimization model. The improved dichotomy search algorithm is used to quickly and accurately optimize the maximum conveyor belt passing speed.