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一、填空 1.具有(节约原材料)、(提高生产率)、(提高零件的机械性能)和(提高零件的精度及表面光洁度)等优越性。 2.(正)挤压、(反)挤压和(复合)挤压。 3.指(凸)模单位面积上承受的压力,它的单位是(公斤/毫米~2)。 4.(硬度降低)、(塑性提高)、(得到良好的金相组织)和(消除内应力)。 5.(降低单位挤压力)、(提高零件的表面质量)、(延长模具使用寿命)。 6.压合次序原则是:由(外)向(内)压入。以三层套为例:先将(中)
First, fill in the blanks 1. With (saving raw materials), (to improve productivity), (to improve the mechanical properties of the parts) and (to improve the accuracy and surface finish) and other advantages. 2. (Positive) Extrusion, (Reverse) Extrusion and (Composite) Extrusion. 3. refers to the (convex) die per unit area under pressure, its unit is (kg / mm ~ 2). 4. (Decrease in hardness), (Increase in ductility), (Get good microstructure) and (Eliminate internal stress). 5. (to reduce the unit squeeze), (to improve the surface quality of parts), (extended mold life). 6. Pressing the order principle is: from (outside) to (inside) pressed into. To three sets of cases: first (middle)