三、棒材、管材和型材的热挤压挤压是将加热好的毛坯强制通过凹模洞口以获得所需形状的过程。这种工艺用于生产长而直的等截面金属半成品,例如棒材、管材、线材和带材。根据不同的润滑技术条件,挤压工艺分为三种形式。无润滑挤压(图1,左)采用平底模,材料通过内部剪切流动并在挤压凹模前端形成死区。润滑挤压(图1,中)是将合适的润滑施于挤压毛坯与挤压模具之间,第 Third, the hot extrusion bar, pipe and profile extrusion is the heating of a rough blank forced through the hole to obtain the desired shape of the process. This process is used to produce long, straight cross-section metal semifinished products such as rods, tubes, wires and strips. According to different technical conditions of lubrication, extrusion process is divided into three forms. The non-lubricated extrusion (Figure 1, left) uses a flat bottom die and the material flows through the internal shear and forms a dead zone at the tip of the extrusion die. Lubrication Extrusion (Figure 1, middle) is the application of appropriate lubrication between the extruded blank and the extrusion die, the first