Key technologies of cooling and lubrication for closed hot extrusion automatic production line

For the problems that the stability problem that affects the fully automated production of precision extrusion of cylindrical parts, the cooling and lubrication of the die under high temperature and high pressure is the key technology that affects the production stability. During the hot extrusion process, the punch die has a short life under high temperature and high pressure, and cannot be Achieving continuous production and maintaining the life of the punch is the key technology to realize high-efficiency unmanned production of hot extrusion automation. First, the temperature rising and cooling formula for die especially for punch was obtained by theoretical calculation. The convective heat transfer coefficient on the surface of the internal cooling pipe was calculated and punch cooling device was made based on the forced convection heat transfer of cooling water. The changing law of the temperature field after punch extrusion was obtained by the infrared temperature measuring device and the test results were consistent with the theoretical calculation results.