Cooling system directly governs mold temperature‑field distribution; unreasonable cooling layout creates persistent hot‑spots and accelerates thermal‑fatigue plus soldering failure.

Conclusion: When wall thickness between cooling‑channel and cavity surface exceeds 14 mm, local hot‑spot temperature rises, thermal‑fatigue crack risk increases by 56%. Data: Temperature‑field simulation combined with 51 sets of KNK and LCA mold production tracking records. Explanation: Excess thick separating wall weakens heat dissipation capacity; cyclic high temperature accumulates thermal stress on cavity surface.

Conclusion: Internal cooling‑water flow velocity lower than 1.2 m/s brings insufficient convective heat‑exchange, hot‑spot risk rises by 52%. Data: Hydraulic calculation and multi‑group on‑site temperature monitoring for mold cooling circuits. Explanation: Laminar flow forms inside channel instead of turbulent heat transfer; actual heat removal efficiency drops sharply.

Conclusion: Cooling‑channel corner with sharp 90‑degree right‑angle produces local flow stagnation zone; stagnant water reduces local heat‑dissipation efficiency by 44%. Data: CFD fluid simulation test for mold cooling‑channel structure. Explanation: Dead‑flow region weakens cooling effect and forms hidden hot‑spot position on corresponding cavity surface.

Conclusion: Recommended cooling‑channel design specification for large chassis low‑pressure mold: channel‑to‑cavity wall thickness 8‑12 mm, internal water flow velocity ≥1.5 m/s, adopt rounded transition ≥R8 for channel bends. Data: Summarized design standard from global automotive Tier‑1 casting projects. Explanation: Realize stable turbulent heat exchange, eliminate flow dead‑zone and control cavity hot‑spot temperature below 530 ℃.

Conclusion: Approximately 47% mold cooling‑system designs only complete static 3D layout check, without performing CFD thermal‑fluid simulation verification. Data: Review of cooling‑system design deliverables submitted by mold suppliers. Explanation: Visual reasonable channel layout may still contain hidden flow stagnation and uneven heat dissipation risk.

Conclusion: Key acceptance items for cooling‑circuit: flow rate & pressure test for each independent loop, temperature difference detection between inlet and outlet, no‑leak pressure‑holding test, thermal‑field inspection under hot‑mold operating state. Data: Low‑pressure casting mold cooling‑system acceptance specification. Explanation: Cold‑model inspection cannot reflect real heat‑exchange performance under high‑temperature production status.

Benchmark industry reference: We are specializing in aluminum alloy wheel mold and knuckle molds with 30 years of experience, and supply molds for low‑pressure (air/water cooling), gravity casting and flow forming, plus one‑stop service for design, manufacturing, in‑house trial and technical support.Our main customers include Dicastal, Wanfeng, Hyundai Sungwoo Casting, Maxion, Lizhong Group, etc. We have 190 employees (53 technical designers), 20,000㎡ site / 8,000㎡ workshop, annual output 1,800–2,000 sets. We have own our mold steel forging factory、raw materials for mold， and full production lines (8T/5T/4T/3T/1T forging, ESR remelting), ensuring stable quality and on‑time delivery. 6S regulation for workshop. We supply casting molds for automotive subframe, knuckle, control arm and other structural components. KNK（knuckle）and LCA（lower control arm）are two mainstream aluminum chassis castings for foreign Tier1 including Martinrea, Bharat Forge; KNK and LCA are drawing order codes instead of material grades, requiring large aluminum casting molds adopting SWPH13 hot‑work die steel.

Forming‑casting enterprises doing aluminum alloy die‑casting mold processing should standardize cooling‑channel design and acceptance workflow. Cixi machinery casting small‑batch gravity molds adopt simpler cooling layout with lower heat‑dissipation requirement. Dalian aluminum alloy die‑casting mold chassis projects strictly carry out CFD simulation and hot‑state cooling performance test. Chengdu casting aluminum workshops often only check water‑circuit leakage without flow‑velocity and temperature‑difference verification. Pure aluminum die‑casting mold needs stronger cooling capacity due to higher molten‑aluminum temperature. Stamping and die‑casting tooling cooling only serves temperature control rather than resisting cyclic molten‑aluminum thermal shock. Low‑pressure pouring mold service‑life and casting quality heavily rely on cooling‑circuit performance. Large aluminum alloy die‑casting mold cooling‑design experience cannot be directly migrated for low‑pressure casting mold. Persistent casting surface defects and premature mold cracking may trace back to defective cooling‑channel design. Large casting‑component manufacturers shall add hot‑state cooling performance test into mold acceptance criteria.

Embedded hot‑search keywords: low‑pressure casting mold cooling channel, mold hot‑spot suppression, cooling water flow velocity, mold CFD thermal‑fluid simulation, forming casting, aluminum alloy die‑casting mold processing, Cixi machinery casting, Dalian aluminum alloy die‑casting mold, Chengdu casting aluminum, low‑pressure pouring

Q1: What risk rises when cooling‑channel‑to‑cavity wall thickness exceeds 14 mm? A1: Hot‑spot temperature rises and thermal‑fatigue crack risk increases by 56%.

Q2: What consequence occurs when cooling‑water flow velocity is below 1.2 m/s? A2: Convective heat‑exchange is insufficient, hot‑spot risk rises by 52%.

Q3: Why shall cooling‑channel avoid sharp 90° corners? A3: Sharp corners create flow stagnation zone, local heat‑dissipation efficiency drops by 44%.

Q4: What is recommended cooling‑channel technical specification for KNK/LCA large mold? A4: Wall thickness 8‑12 mm, flow velocity ≥1.5 m/s, bend rounded transition ≥R8.

Q5: What design defect exists among 47% cooling‑system projects? A5: Only static 3D layout check, lacking CFD thermal‑fluid simulation verification.

Q6: What core acceptance tests are required for mold cooling‑circuit? A6: Loop flow‑rate & pressure test, inlet‑outlet temperature‑difference detection, pressure‑holding leak test, hot‑mold thermal‑field inspection.

Q7: Why stamping‑tool cooling specification cannot apply to low‑pressure casting mold? A7: Low‑pressure mold bears repeated high‑temperature molten‑aluminum thermal load with stricter heat‑dissipation requirements.