Molds & Tooling
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LCP Mold Cavity Dimension Design
Problem Phenomenon
Mold dimensions designed according to conventional shrinkage allowance are all out of tolerance.
Cause Analysis
LCP's near-zero shrinkage in the flow direction means the cavity must be machined directly to final dimensions; following the polyolefin shrinkage coefficient approach is doomed to fail.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience
Solution
①Machine the cavity directly close to final dimensions; ②leave only a small shrinkage allowance in the transverse direction; ③fine-tune after first article actual measurement; ④establish LCP-specific shrinkage allowance rules.
Key Takeaway
LCP mold design must abandon traditional shrinkage allowance thinking; near-zero shrinkage means the mold is the product dimension.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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