镁合金成型技术的基础知识(一)****关于镁合金

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[em01]<P 0cm 0cm 0pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><B normal"><FONT face="Times New Roman"> </FONT></B><B normal">镁合金铸造方法</B><FONT face="Times New Roman"><B normal"> </B><p></p></FONT></P><P 0cm 0cm 0pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto">镁合金铸造方法大致可分为：（<FONT face="Times New Roman">1</FONT>）重力浇注<FONT face="Times New Roman"> (Gravity Die casting) </FONT>、（<FONT face="Times New Roman">2</FONT>）低压铸造<FONT face="Times New Roman"> (Low pressure die casting) </FONT>、（<FONT face="Times New Roman">3</FONT>）半固态压铸<FONT face="Times New Roman"> (Thixcasting) </FONT>、（<FONT face="Times New Roman">4</FONT>）半熔注塑法<FONT face="Times New Roman"> (Thixomolding) </FONT>及（<FONT face="Times New Roman">5</FONT>﹞压铸<FONT face="Times New Roman"> (High pressure die casting)</FONT>。半熔注塑法和半固态压铸为较新之生产技术。半熔注塑原理接近注塑机，首先把镁锭加工切削成细料状，原料由进料筒定量进入螺杆，在加热区通过螺杆转动挤压推进，使其变成半熔状态并高速高压射入模腔，由于无需完全熔化，此法较节省能源，亦较为安全，无需保护气体或覆盖盐，内在气泡较少，表面质量亦较高。但同时亦存在很多问题有待解决，例如：<p></p></P><P 0cm 0cm 0pt 57.25pt; TEXT-INDENT: -21.25pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-list: l3 level1 lfo1; tab-stops: list 21.25pt 36.0pt">·     <FONT face="Times New Roman">  </FONT>原料较贵<FONT face="Times New Roman"> <p></p></FONT></P><P 0cm 0cm 0pt 57.25pt; TEXT-INDENT: -21.25pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-list: l3 level1 lfo1; tab-stops: list 21.25pt 36.0pt">·     <FONT face="Times New Roman">  </FONT>设备昂贵<FONT face="Times New Roman"> <p></p></FONT></P><P 0cm 0cm 0pt 57.25pt; TEXT-INDENT: -21.25pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-list: l3 level1 lfo1; tab-stops: list 21.25pt 36.0pt">·     <FONT face="Times New Roman">  </FONT>生产速度慢<FONT face="Times New Roman"> <p></p></FONT></P><P 0cm 0cm 0pt 57.25pt; TEXT-INDENT: -21.25pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-list: l3 level1 lfo1; tab-stops: list 21.25pt 36.0pt">·     <FONT face="Times New Roman">  </FONT>技术尚未稳定，其中参数如定量控制，各温度区的准确控制均有难度，因此成品率不高。所以此法目前用家不多<FONT face="Times New Roman"> </FONT><p></p></P>

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[em07]

vui

<p>好</p><p></p>

redhats

说的不明白

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