... 粘性熔渣 viscous slag 胀疤 expansion scab 振动清箱，振动清砂处 shake-out ...
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Reducing expansion stress of the moulding sand and increasing wet tensile strength of moulding sand are the main measures to prevent scab defect.
防止夹砂缺陷的主要措施是降低型砂的膨胀应力和提高型砂的热湿拉强度。
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