钢管玻璃润滑热挤压工艺的边界条件

Boundary parameters during glass lubricated hot extrusion of steel pipes

以P91钢为例进行了小口径钢管玻璃润滑热挤压工艺试验，记录不同挤压温度、挤压速度下的挤压力变化。以物理试验的观察结果为依据，借助于有限元软件DEFORM2D进行模拟分析，根据稳定挤压阶段的挤压力大小，得出相应的摩擦系数，根据挤压力曲线的后期变化趋势，得出相应的换热系数。并最终得出玻璃润滑边界的换热系数q≤1．0×10。J／（m2·s·℃），库仑摩擦系数μ=0．02～0．03，从而为钢管玻璃润滑热挤压工艺提供合理准确的边界参数。

Glass lubricated small pipe extrusion tests of P91 steel were operated, and extrusion forces were observed under different speeds and temperatures. Compared with the tests, systemic FEM simulation analysis was operated in DEFORM 2D. According to the extrusion force in the stable extrusion process, the friction factor was obtained. And according to the later change of the force curves, the heat transfer coefficient was obtained. In conclusion, the coulomb friction factor/L is between 0. 02 to 0. 03 and the heat transfer coefficient q is under 1.0 ×103J/ （m^2 · s · ℃） on the glass lubricated boundary, which can be applied to the glass lubricated steel pipe extrusion properly and precisely.