Injection Molding
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POM gear precision out of tolerance
Problem Phenomenon
Injection molded gears have tooth profile precision and center distance out of tolerance, large meshing noise, and dimensional drift between different batches.
Cause Analysis
POM's high shrinkage and post-crystallization cause tooth profile dimensions to change over time; mold temperature fluctuation and unstable holding pressure cause shrinkage differences between batches, making precision dimensions difficult to stabilize.
Solution
①Compensate the mold precisely according to the measured shrinkage; ②stabilize mold temperature and holding pressure curve; ③inspect products after aging; ④perform full-dimension FAI verification on critical dimensions.
Key Takeaway
The core of precision POM gears is the predictability of shrinkage; a stable process window plus sufficient aging is the prerequisite for ensuring tooth profile precision.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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