Injection Molding
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Mold Steel Selection Mistake for PEEK
Problem Phenomenon
[Problem Phenomenon] After P20 or aluminum molds process PEEK, the cavity deforms and wears, and dimensional accuracy is quickly lost
Cause Analysis
PEEK's high injection pressure (100-150MPa) and 160-200℃ mold temperature place demanding requirements on mold steel, which P20 and aluminum molds cannot withstand; industry practice takes H13 as the bottom line and uses S136 for high-life molds
Solution
PEEK mold steel is at minimum quenched H13, and S136 stainless steel for high requirements; small-batch prototypes may use semi-hard H13 with carefully designed gates; select the mold base guide pins for high-temperature working conditions
Key Takeaway
H13 is the bottom line of PEEK mold steel — the money saved on a soft mold will be repaid double in accuracy; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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