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常规拨制异型管多使用固定模拔制,这种方法有致命的缺点,即在模子与金属间存在有很大的摩擦力,从而导致电耗大、模具寿命低、产品表面质量差以及多数品种需衬芯棒拔、造成金属消耗高等。 四辊滚模是由四个可转动的辊子构成拨管变形区,变固定模的滑动摩擦为滚动摩擦,显著地降低了变形区中摩擦力,与此同时还改变了变形区中速度条件和变形条件,
Conventional dial-shaped tube more use of fixed-mode drawing, this method has the fatal flaw, that is, between the mold and the metal there is a great friction, resulting in large power consumption, low mold life, poor product quality and the majority of the surface Variety to be lined mandibular pull, resulting in higher metal consumption. The four-roll mold is composed of four rotatable rollers to form the deflection zone of the draft tube. The sliding friction of the fixed mold is the rolling friction, which obviously reduces the friction force in the deformation zone. At the same time, it also changes the speed conditions in the deformation zone and Deformation conditions,