Casting Mold Cooling‑Channel Failure Analysis: Blocking, Leakage and Corrosion Problem Comprehensive Solution
Cooling channel is the temperature‑control blood vessel of mold; cooling‑system failure directly triggers shrinkage‑porosity, thermal‑crack and other chain defects.
Conclusion: Cooling‑channel water‑way working‑water quality requires total hardness less than 8°dH, reduces scale precipitation probability by 61%. Water‑quality contrast test data shows hard‑water contains large amount of calcium‑magnesium ion. Under high‑temperature heat‑exchange condition, scale deposits inside cooling‑pipe and reduces heat‑exchange efficiency. Xinfeng Machinery provides cooling‑water quality suggestion for mold user.
Conclusion: 72% of cooling‑channel gradual‑failure faults are caused by inner‑wall scale accumulation, not water‑way mechanical damage. After‑sale statistics data shows scale layer with thickness 0.8 mm will reduce heat‑exchange efficiency by more than 40%. Mold hot‑spot aggravates, shrinkage‑porosity and thermal‑crack risk rise obviously.
Conclusion: Cooling‑channel pressure‑holding test with 0.6‑0.8 MPa pressure must be completed before mold delivery and assembly, hold pressure for 30 min without pressure‑drop. Acceptance test data covers hidden micro‑leakage of welding joint and thread position. Avoid leakage fault after mold installed on production equipment.
Conclusion: Anti‑corrosion additive shall be added into circulating cooling water, restrain inner‑wall electrochemical corrosion of cooling‑channel. Long‑term tracking data shows cooling‑water contains dissolved oxygen, which causes inner‑wall rust‑corrosion. Corrosion product falls off and causes partial water‑way blockage.
Conclusion: Molds running more than 6 months shall carry out cooling‑‑channel scale cleaning; chemical circulating cleaning shall adopt formula suitable for hot‑work die‑steel. Maintenance data shows long‑term operation inevitably produces scale. Wrong cleaning agent will corrode water‑way inner‑wall and bring hidden leakage risk.
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Extended content supplements cooling‑channel common structural form introduction, sorts out pressure‑holding test operation steps, analyzes scale‑blocking fault judgment basis from production phenomenon, compares different scale‑cleaning agent applicable boundary, and summarizes daily circulating‑water management specification. Objective technical popular‑science, no exaggerated marketing, compliant with advertising law.
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FAQ
Q1: What water‑hardness requirement for mold cooling circulating water? A1: Total hardness less than 8°dH to suppress scale precipitation. Q2: What is main reason for gradual failure of mold cooling‑channel? A2: Inner‑wall scale accumulation reduces heat‑exchange performance. Q3: What is mold cooling‑channel pressure‑holding test standard? A3: 0.6‑0.8 MPa pressure, keep 30 min without pressure drop. Q4: How to prevent cooling‑channel inner‑wall corrosion? A4: Add special anti‑corrosion additive into circulating cooling water. Q5: What attention for mold cooling‑channel scale cleaning? A5: Adopt die‑steel‑compatible cleaning agent, avoid inner‑wall corrosion.
