HEATS 发表于 2010-9-12 10:11:12

精密铸造片铣刀齿坯的疏松和粗晶

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<TD width="100%" colSpan=4><FONT face=宋体 size=2>材料：W18Cr4V（俗称P18）。这是用于镶嵌在高速片铣刀体上的刃齿，精密铸造成长条状，然后再分切成单个刃齿，其铸件毛坯的形状尺寸和超声检测方向如下图所示。使用5P20单直探头，接触法，20~40#机油耦合，采用底波多次反射法，以底波反射次数的多少来判断是否有缺陷存在。工件为毛面，即未经机械加工的精密铸造自然表面，将工件浸入一浅油槽中，使机油刚好浸没探测面，以保证耦合稳定。注：断口位置是取自拍照波形时探头所在位置的中心线。</FONT></TD></TR>
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