UC知道急求一段英文（关于铸造方面的）
来源：百度知道 编辑：UC知道 时间：2024/05/28 19:37:12
Squeeze casting is a process which involves the solidi-
fication of a molten metal in a closed die under an
imposed high pressure. Other terms used to describe
the same or similar processes are liquid metal forging,
extrusion casting and pressure crystallization. The
high applied pressure, which is several orders of mag-
nitude greater than the melt pressure developed in
normal casting processes, keeps entrapped gases in
solution and squeezes molten metal from hot spots to
incipient shrinkage pores. As a result, the porosity in
a squeeze-cast component is almost eliminated. Fur-
thermore, due to the elimination of the air gap at the
liquid-mould interface by the applied high pressure,
the heat transfer across die surfaces is enhanced, which
increases solidification and cooling rates. Thus, su-
perior mechanical properties of the casting resulting
from the pore-free fine microstructure are aEhieved in
s
fication of a molten metal in a closed die under an
imposed high pressure. Other terms used to describe
the same or similar processes are liquid metal forging,
extrusion casting and pressure crystallization. The
high applied pressure, which is several orders of mag-
nitude greater than the melt pressure developed in
normal casting processes, keeps entrapped gases in
solution and squeezes molten metal from hot spots to
incipient shrinkage pores. As a result, the porosity in
a squeeze-cast component is almost eliminated. Fur-
thermore, due to the elimination of the air gap at the
liquid-mould interface by the applied high pressure,
the heat transfer across die surfaces is enhanced, which
increases solidification and cooling rates. Thus, su-
perior mechanical properties of the casting resulting
from the pore-free fine microstructure are aEhieved in
s
模压铸造是在密闭的金属模环境里对熔融金属施加强高压使其凝固的一种工艺。用来描述相同或相似的工艺的其他术语有液体金属锻造，挤压铸造，和压力结晶。这种高压是比正常铸造工艺中的熔体压力产生的强度更大的一种工序，它能使保持闭气溶解和把熔融金属从过热点到初期缩孔进行挤压。因此，模压铸造组件的多孔性几乎是不存在的。此外，由于施加的强高压使液模界面不存在空气间隙，模表面传热得到了加强，由此增加了凝固和冷却的速度。因此，在模压铸造工艺中由于无孔微结构的实现从而显现出了模压铸造的优越性能。
模压铸造是指让熔化的金属通过施加高压的方式在封闭模具中凝固的工艺。其他描述相同或相似过程的术语还包括液体金属铸造， 挤压铸造和压迫结晶。这里所施加的高压比常规铸造工艺的熔化压力还要高几个级别，它可以使封闭的气体保持溶解状态并将之从热点向最初收缩的气孔挤压。这样就尽可能的消除了模压器具上的小孔。另外由于施加的高压消除了液压界面的空气间隙， 模具表面传热速度大大加快，从而也提高了凝固及冷却的速度。因此由无孔微观结构催生的铸造工艺凸显了模压铸造工艺的优越性。