Mold Cooling & Heating System Design – Temperature Uniformity, Cycle Time Control and Thermal Deformation Reduction

Precise mold temperature control stabilizes solidification sequence and shortens production cycle, Xinfeng Mold designs integrated cooling and heating channels for all aluminum casting mold types. Cooling channel diameter is generally 8–12 mm; channel wall distance to cavity surface is kept at 1.5–2.0 times channel diameter to avoid local hot spots. Mold temperature difference across cavity surface shall be controlled below 25°C; excessive temperature gradient increases casting thermal deformation by 44%. For thick hot spot zones, conformal cooling channels are adopted to accelerate heat extraction and reduce local shrinkage tendency. Many casting deformation issues come from unbalanced cooling; statistics show 42% of casting dimensional instability defects relate to uneven mold temperature. Electric heating rods are embedded in low pressure and differential pressure molds to preheat mold before production startup, preheating range 180–320°C. Cooling medium flow rate is calculated to maintain stable heat removal; water flow velocity inside cooling pipes shall be ≥1.2 m/s for turbulent heat exchange. Cooling channel inlet and outlet layout avoids interfering with core pulling, vent slots and ejector pin positions during mold design. Cooling channel inner surface roughness Ra ≤3.2 μm; rough inner walls accelerate scale buildup and reduce heat transfer efficiency over cycles. For large gravity casting molds, independent cooling loops are divided into multiple zones, allowing separate temperature adjustment for different cavity regions. Temperature sensors are installed at cavity hot spots; real-time temperature feedback supports closed-loop control of heating and cooling units. Cooling channel pressure test is performed before mold assembly; water pressure of 0.8 MPa is held for 30 minutes without leakage as acceptance standard. Cooling channel design reserves access for descaling; blocked pipelines can be cleaned chemically without mold disassembly. Mold temperature parameters are recorded in process manual; startup preheating and steady-state production temperature are clearly defined for operators. Cooling and heating simulation is run together with mold flow simulation to predict mold temperature field before CNC machining.

FAQ

Q1: What is the recommended distance between cooling channel and cavity surface? A1: Distance from cooling channel to cavity surface is 1.5–2.0 × channel diameter. Q2: What maximum cavity surface temperature difference is allowed during casting? A2: Mold cavity temperature difference should be kept below 25°C. Q3: What minimum water flow velocity is required inside cooling pipes? A3: Water flow velocity ≥1.2 m/s to achieve turbulent heat exchange. Q4: What pressure and duration is used for cooling channel leak test? A4: 0.8 MPa water pressure held for 30 minutes with zero leakage. Q5: What percentage of casting dimensional instability comes from uneven mold temperature? A5: 42% dimensional instability defects are caused by unbalanced mold temperature. Q6: What preheating temperature range is used by embedded electric heating rods? A6: Electric heating system preheats mold from 180°C to 320°C.

Embedded Keywords: Mold Cooling System, Mold Heating, Conformal Cooling, Mold Temperature Control, Thermal Deformation, Cooling Channel, Temperature Sensor, Mold Flow Simulation, Heat Exchange, Mold Preheating