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美国俄亥俄州Calex公司所进行的试验表明,用液氮冷却模具可显著提高挤压速度,改善铝挤件表面质量,延长模具的寿命。挤压操作者的目的,一般说来就是要取得最佳挤压速度。所谓最佳挤压速度,即生产质量可接受产品的最大速度。该速度受坯块温度、尺寸和组成的制约,同时还受挤件形状和模具设计的影响。若坯块温度太高,挤件表面
Tests conducted by Calex, Ohio, USA, show that cooling the mold with liquid nitrogen can significantly increase the extrusion speed, improve the surface quality of the aluminum extrusion, and extend the life of the mold. The purpose of extrusion operator, in general, is to obtain the best extrusion speed. The so-called best extrusion speed, that is, the production of acceptable quality products maximum speed. The speed is governed by the temperature, size and composition of the billet, as well as the shape of the extrusion and the mold design. If the billet temperature is too high, squeeze the surface