<>又是很trouble的问题!!!</P>
<>可能产生的原因如下:</P>
<>一、材质:</P>
<>1)Insufficient glass wet out with resin (dry glass)
玻璃纤维未能浸润</P>
<>2)Foreign objects/contamination (film, flash, etc.) in or on the charge
有杂质</P>
<>3)Wrinkles/pockets in discontinuous surface of SMC charge pattern
SMC表面不平整</P>
<>二、生产工艺:</P>
<>1)Adding small SMC pieces to charge pattern which trap air
小块的SMC补片内裹气(布料不良)</P>
<>2)Insufficient pressure on SMC during cure cycle
固化时压力不足</P>
<>3)Oven temperature heat-up rate too fast, especially in combination with a high moisture content part
烘箱加热太快,特别是含水率偏高时</P>
<P>4)Improper charge patter (too large, rolled or folded)
充填不良</P>
<P>5)Vacuum too low; improper vacuum cycle
排气动作不当</P>
<P>6)Low cure time (under cure)
固化时间太短(未完全固化)</P>
<P>7)Press closure speed to fast (air trapped in laminate)
合模速度太快</P>
<P>三、模具:</P>
<P>1)Mold shear edge is too tight (not allowing air to bleed out)
模具间隙太小(无法排气)</P>
<P>2)Tool Deflection
加工尺寸偏差</P>
[此贴子已经被作者于2006-4-6 12:07:03编辑过] |