Molding Process
7 조회수
PTFE Poor Dimensional Stability
문제 현상
PTFE precision parts' dimensions change significantly with ambient temperature, they go out of tolerance after machining and placement, and tolerance marking according to metal part requirements causes disputes.
원인 분석
PTFE has a large thermal expansion coefficient that changes irregularly with temperature; large cold-hot shrinkage changes; ambient temperature changes after sintering, cooling, or machining cause dimensional changes; thermal expansion is 10 times greater than iron.
해결 방법
①Mark tolerances according to PTFE's actual expansion characteristics; ②Measure critical dimensions at use temperature; ③Reserve expansion clearance in design; ④Communicate material differences of tolerance standards with customers.
핵심 요약
PTFE dimensional management must follow material characteristics rather than metal habits; the 10-fold thermal expansion difference is a communication point; measurement at use temperature is a pragmatic method.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!