Molds & Tooling
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PTFE Compression Molding Inaccurate Dimensions
문제 현상
PTFE compression molded products have large external dimension deviations, inconsistent dimensions at different positions in the same mold shot, and assembly fit out of tolerance.
원인 분석
Resin molecular weight too small or unevenly distributed; uneven pressure in preforming; uneven feeding without leveling; improper holding pressure, pressure not transmitted to all parts of the resin; the greater the pressure, the longer the holding pressure time required.
해결 방법
①Select resin with the same batch number and consistent performance; ②Press uniformly and slowly; ③Feed uniformly into the mold sleeve and level off; ④Give corresponding holding pressure time for different pressures, greater pressure means slower pressing and longer holding.
핵심 요약
PTFE dimensional accuracy depends on the uniformity of pressure transfer; feeding and leveling is a simple but critical action; the matching relationship between pressure and holding pressure time must be followed.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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