关键词: 材料合成与加工工艺, 防撞梁, 热冲压模具, 冷却系统, 边界层

Abstract: Taking the cooling system of anti-collision beam hot stamping die as the research object, the heat transfer in this system is analyzed based on the convection heat transfer and fluid principle combined with the boundary layer theory. A design scheme of the cooling system is put forward, and its cooling effect is simulated using software Fluent. The cooling system is numerically optimized until the simulation results meet the design requirements. Experiment is carried out to verify the numerical optimization. Results show that in the die design, larger pipe radius (R), smaller pipe sidewall spacing (L), and smaller vertical distance between pipe top and die surface (H) lead to larger sheet metal cooling rate. Among them, H has larger influence on die cooling rate and L has larger influence on the maximum temperature difference. The martensitic transformation of the sheet metal is realized under the premise of uniform cooling by partial adjusting parameters R, L and H. Furthermore, in the design, the structural strength and thermal stability of the cooling system for long-term work are considered.

Key words: materials synthesis and processing technology, anti-collision beam, hot stamping die, cooling system, boundary layer