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树脂砂型芯在起模时已具有一定的硬化强度,无退让性,一般不能通过敲击模样和芯盒框使砂型或砂芯壁来达到松动模样
Resin sand core in the mold has a certain degree of hardening strength, non-concession, the general can not by striking the shape and core box to sand or sand core wall to achieve loose appearance