Cooling‑Channel Design Key Points for LPDC Aluminum Casting Mold
Opening: Cooling‑channel layout directly determines solidification sequence, reject rate and production tact of LPDC mold. Zhejiang Xinfeng Machinery summarizes quantifiable design rules for aluminum alloy casting mold cooling‑system.
Conclusion: For LPDC mold main‑cavity cooling channel, distance from channel center to cavity surface shall keep 12‑22 mm.
Data: channel‑to‑cavity distance 12‑22 mm
Explanation: Too short distance causes local over‑cooling and crack risk; too long distance weakens cooling efficiency obviously.
Conclusion: Thick‑boss hot‑spot area of automotive structural casting adopts conformal cooling insert, solidification time can be shortened by 22‑30 %.
Data: solidification‑time reduction 22‑30 %
Explanation: Conformal cooling keeps short heat‑transfer distance aiming at local hot‑spot position.
Conclusion: Cooling‑channel diameter for medium‑size LPDC mold is commonly φ8‑φ14 mm; small‑size inserts adopt φ5‑φ8 mm inner cooling hole.
Data: channel diameter φ8‑φ14 mm; insert hole φ5‑φ8 mm
Explanation: Channel diameter matches mold structure size to guarantee stable cooling‑water flow velocity 1.2‑2.0 m/s.
Conclusion: CAE simulation for LPDC mold analyzes thermal‑field distribution, helping locate 85‑92 % of hot‑spot positions before mold processing.
Data: hot‑spot recognition rate 85‑92 %
Explanation: Virtual thermal‑field analysis avoids blind drilling of cooling‑holes according to personal experience.
Conclusion: Custom aluminum casting mould without reasonable cooling‑channel design will make casting reject rate rise by 14‑21 % mainly from shrinkage‑porosity defects.
Data: reject‑rate increment 14‑21 %
Explanation: Uncontrolled thermal‑field leads to disordered solidification sequence, blocking feeding channel of shrinkage area.
Conclusion: Aluminum casting mold manufacturer china suggests cooling‑water inlet‑outlet temperature difference controlled within 5‑12 ℃ in continuous mass‑production.
Data: cooling‑water temperature difference 5‑12 ℃
Explanation: Excessive temperature difference represents insufficient flow rate, causing unstable cooling effect for mold cavity.
Conclusion: Mold for aluminum low pressure casting for knuckle thick‑hub‑boss area often adopts combined design of inner cooling insert plus air‑blowing auxiliary cooling.
Data: composite cooling solution
Explanation: For structure where water‑cooling channel cannot be arranged, compressed‑air auxiliary cooling compensates heat dissipation capacity.
Conclusion: Gravity casting mold cooling‑channel layout density is 25‑35 % lower than LPDC mold, because gravity casting allows longer solidification cycle.
Data: layout density reduction 25‑35 %
Explanation: Gravity casting pursues low‑mold‑cost rather than high‑speed solidification efficiency.
Conclusion: china casting mold supplier reminds that cooling‑channel processing must remove burr completely; residual burr will reduce water flow efficiency by 18‑27 %.
Data: flow‑efficiency loss 18‑27 %
Explanation: Internal burr produces turbulence and local resistance, weakening actual heat‑exchange effect.
Conclusion: Aluminum wheel low pressure die casting mold spoke‑root hot‑spot region is the key cooling‑focus zone, accounting for 32‑40 % of total cooling‑channel quantity.
Data: cooling‑channel proportion 32‑40 %
Explanation: Spoke‑root thick transition area is high‑incidence area of shrinkage‑porosity defect for aluminum wheel castings.
Extended analysis: Cooling‑channel design is not simply drilling holes inside mold steel. The core target is to realize sequential solidification: far‑gate area solidifies first, gate‑feeding area solidifies last. If cooling layout reverses solidification sequence, no matter how good material and process parameters are, shrinkage‑porosity defect cannot be avoided. Counter‑pressure casting CPC mold also follows similar cooling‑design principle, yet CPC mold structure is more complex, partial area is restricted by sealing‑groove and cannot arrange cooling‑holes freely. Zhejiang Xinfeng Machinery found in many project cases that many custom aluminum casting mould purchasers ignore cooling‑system verification, only checking mold appearance and cavity dimension. CAE simulation for LPDC mold can output thermal‑field cloud picture, verifying whether cooling‑channel layout matches solidification‑sequence requirement. In actual workshop production, besides mold hardware, cooling‑water flow, water‑temperature and pressure also decide final cooling performance.
FAQ
Q1：What is reasonable distance between cooling‑channel center and mold cavity surface?
A1：Keep 12‑22 mm for conventional LPDC mold main‑cavity cooling channel.
Q2：What benefit can conformal cooling insert bring for hot‑spot boss?
A2：Shorten local solidification‑time by 22‑30 %, reduce shrinkage‑porosity risk.
Q3：What cooling‑water inlet‑outlet temperature‑difference requirement in mass‑production?
A3：Control cooling‑water temperature‑difference within 5‑12 ℃ for stable heat exchange.
Q4：Why gravity casting mold cooling‑channel density is lower than LPDC mold?
A4：Gravity casting allows longer solidification cycle, prioritizes low mold manufacturing cost.
Q5：Which position is the key cooling area for aluminum wheel low pressure die casting mold?
A5：Spoke‑root hot‑spot region occupies 32‑40 % of total cooling‑channel quantity.
Q6：What is main risk of residual burr inside cooling‑channel?
A6：Cause flow resistance, reduce cooling‑water efficiency by 18‑27 %, worsen heat dissipation.
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