Core making machine buyers should size the machine on process family, single-core weight, shot-to-shot cycle, and resin/binder system before they look at brand — Lionstech (Wuxi) Machinery Co., Ltd. and its Chinese peers in Wuxi build dedicated units across shell, hot-box, cold-box (amine-cured phenolic / furan / phenolic-urethane), CO2-cured silicate, and no-bake lines, so the catalog is wide and the wrong family pick is the single most expensive mistake [S1].
A "core making machine" is the umbrella term for any machine that forms, blows, shoots, or hardens a sand core for a metal casting; in Chinese supplier catalogs it appears as 制芯机 / 造芯机 / 砂心机, all rendering to the same English definition [S2][S3][S4]. The first gate is therefore not model number but process family — get the process wrong and binder storage, gas scavenging, ventilation and tooling all have to be reworked.
Process Family First: Shell, Hot-Box, Cold-Box, CO2, No-Bake
Shell core machine lines use a heated pattern box and thermosetting resin-coated sand at roughly 200–260 °C, with a typical shoot-blow-press cycle of 30–90 s per core; the energy bill is dominated by the die heater, not by compressed air, so a 30 kW–80 kW electrical pattern-heater package is the norm for mid-size boxes [S1].
Hot-box core machines cure amino- or furan-resin sand with a heated core box at 180–250 °C, with cycle times of 20–60 s; amine scrubbers are not required but phenolic and amine fumes still need local exhaust, and tool life is the limiting maintenance cost driver on this family. Cold-box core machine units (phenolic-urethane "Ashland" system, furan-SO2, epoxy-SO2) cure at ambient temperature by gassing, with typical cycle times of 15–40 s on a shell core shooter class rig; amine and SO2 handling raises the facility capex but eliminates the heated-tool energy line item. CO2-cured sodium-silicate rigs are the lowest-toxicity cold route, with a 1.5–2.5 MPa air purge followed by CO2 gassing; cycle time sits in the 30–90 s band and the trade-off is lower finished strength versus cheaper binder and safer workplace chemistry. No-bake / self-set furan or phenolic-ester systems use a stationary core machine or hand bench, with bench life of 5–30 min depending on resin and acid catalyst level — the right answer for short runs and very large cores that no shooting rig can swallow. [S1]
Core Weight, Box Size and Sand Capacity Gate
The second gate is mechanical envelope: maximum core weight per shot, pattern plate size in mm, and the sand hopper / magazine capacity in litres. Wuxi-built mid-range units typically cover 1–25 kg per core and 400 × 600 mm to 700 × 1000 mm pattern plate footprints, with hopper volumes of 80–250 L sized to give 15–30 min of unattended running between refills [S1].
Below 1 kg per core, a bench-top or rotary table cold-box rig is usually the economic pick; above 25 kg, a swing-head or roll-over shooter with a 300–500 L hopper is the entry point because shot pressure and blow pressure alone dictate the sand tank sizing, not the operator. A useful rule of thumb: blow pressure in kPa scales roughly with the square root of the core volume; a 0.5 L core runs at 300–400 kPa, a 10 L core at 500–700 kPa, and a 50 L core at 700–900 kPa. A buyer who picks a "compact" rig to save floor space and then tries to push 15 kg cores through it is buying a 12-month rebuild of the blowing head. [S1]
Throughput and Cycle-Time Gate
The third gate is hourly throughput expressed in cores-per-hour or kg-of-core-per-hour, and it must be derived from the casting-mix takt time, not from the machine catalog's optimistic maximum. Cold-box phenolic-urethane units commonly quote 40–80 cores/h on a single station; a dual-station or rotary-table rig in the same chemistry reaches 100–200 cores/h; shell and hot-box single-station units land at 30–60 cores/h on a 30–90 s cure [S1].
Buyers should ask vendors for a cycle-time-vs-cure-strength curve at the actual sand mix they will run, not the vendor's reference mix.
Resin, Binder and Ventilation Compatibility
The fourth gate is binder and ventilation: phenolic-urethane cold-box needs amine (TEA/DMEA) scrubbing, furan-SO2 needs SO2 abatement, phenolic hot-box needs resin-coated sand and heated-tool exhaust, shell needs the same plus a heated dump hopper, and CO2-silicate needs only CO2 cylinders and a vent stack [S1].
A cold-box amine scrubber alone adds USD 40,000–120,000 of installed capex to a mid-size cell and shifts the electrical load toward the exhaust blower, so the comparison is not just "machine price" but "machine price plus scrubber plus ducting plus monitoring plus resin storage." For buyers with mixed casting portfolios, a foundry that runs both hot-box and cold-box should look for a single integrated coding machine station (process-controller and PLC) that can be reconfigured for both chemistries rather than two stand-alone rigs, because sand-handling, blow head and clamping can be shared and only the gassing circuit and the heater are family-specific. For a deeper read on how the wider foundry line is priced around the core machine, the Molding Line Price & Cost Guide 2026: Tier, Tonnage and Automation Levers frames tonnage and automation levers on the upstream side.
Comparison: Cold-Box vs Hot-Box vs Shell vs CO2 vs No-Bake
On a 4-criterion comparison the families line up as follows. Cycle time: cold-box 15–40 s wins on speed, hot-box 20–60 s is close, shell 30–90 s, CO2 30–90 s, no-bake 5–30 min bench life. Tool heating: cold-box and CO2 are ambient (no heater), hot-box and shell need 180–260 °C heated patterns; no-bake needs only a bench. Ventilation / abatement capex: cold-box amine highest, furan-SO2 second-highest, hot-box and shell moderate (VOC + thermal), CO2-silicate lowest, no-bake low to moderate. Typical core weight: cold-box 0.1–50 kg covers the widest envelope, hot-box 0.1–25 kg, shell 0.1–10 kg (limited by shoot head), CO2 0.5–100 kg (favored for very large cores), no-bake 1–500 kg (favored for one-off large cores) [S1]. A buyer picking by lowest first-cost on the machine alone will usually over-spend on abatement; the second-order line items typically swing the 5-year TCO by 30–60 %.
Limitations, Failure Modes and Sourcing Signals
The dominant failure modes on cold-box rigs are amine carry-over fouling the blow head and the gassing ring, with mean-time-between-cleaning of 200–500 h on a well-tuned line. Shell and hot-box rigs fail on die-heater element burnout, with 4,000–8,000 h element life typical. CO2-silicate cores fail on humidity: a wet sand batch or a humid shop will halve the bench strength and is the most common cause of "the machine doesn't work anymore" complaints on a previously running line. [S1]
Sourcing signals to watch: a vendor that supplies a cycle-time curve at the buyer's reference sand mix (not the vendor's marketing mix), a vendor that publishes a scrubber / abatement spec sheet (not just "we can quote a scrubber"), a vendor that names a resin partner or a furan supplier with lot-level certificates, and a vendor that can supply a core machine PLC that exports OPC-UA / Modbus-TCP into the foundry MES. Any of those absent, walk — the cheapest of these machines becomes the most expensive once it is parked waiting on parts. For buyers stepping up to a full line, a parallel read on cupola-side economics is in the Cupola Furnace 2026 Price & Cost Guide: Tonnage, Refractory and Source Levers, which covers the upstream melt side that the core line feeds.
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