Primary-aluminum capacity planning starts at the potline: a 500 kA reduction cell line of 320 cells is sized to deliver roughly 430,000 tonnes per year of primary aluminum, the exact restart block Yingkou Zhongwang Aluminum scheduled to bring back online by end-2021 from a base of 460,000 t/y operating against an 890,000 t/y nameplate [S3]. That ratio — about 1,340 t/y per 500 kA cell — is the planning constant engineers use to convert an amperage upgrade or a cell-count change into a tonnes figure before any downstream caster is sized.
On the downstream side, capacity planning reads as equipment spec, not abstract tonnage: an aluminum die casting machine cell is rated by clamping force (typically 160–1,600 tonnes for most auto-part and machine-part shops) and shot weight, while a gas aluminum melting furnace is rated by melt rate (kg/h) and holding capacity. Sourcing pages from late July 2026 confirm live Chinese OEM capacity in both — Qingdao Rongmaofa Metal lists IATF 16949 certification alongside aluminum die casting as a main product line [S6], and a Shenzhen case maker runs an aluminum case / makeup case / tool case / RC case shop out of Longgang District [S5] — so the question for 2026 planners is how many cells, furnaces, and presses must run, not whether they exist.
Primary Smelter Planning: Potline Math and Restart Logic
Primary-aluminum capacity is the product of cell count, line current, current efficiency, and aluminum recovery; a 500 kA potline running ~95% current efficiency lands near 1.34 t/cell-year, which lines up with the 320-cell, 430,000 t/y block reported at Yingkou Zhongwang [S3]. A restart plan therefore cascades: energize cells in groups sized to the rectifier capacity, ramp amperage against the aluminum alloy tap temperature window, and feed metal only when the casting house has degassing and filtration capacity ready to take it.
Production capacity planning in an ERP sense — Master Production Schedule plus Resource Requirements Planning plus Rough-Cut Capacity Planning — is the same hierarchy, just translated from IT throughput to molten-metal throughput: a JD Edwards-style capacity module checks whether each work center (reduction, casthouse, homogenizing furnace) has hours available to absorb the MPS [S4]. The same logic appears in WebLogic-era capacity planning documentation, where capacity is a function of measured TPS, concurrent sessions, and configured hardware [S2] — the production analog is tonnes, line current, and configured pots.
Downstream Capacity Mapping: Die Casting, Ceilings, and Cases
Downstream capacity planning gets more granular because every product line runs at a different machine-utilization profile. Die casting shops on the Shandong coast — IATF 16949 shops like Qingdao Rongmaofa — plan capacity in shifts × clamping-force hours × cycle time, with auto-part runs typically targeting 85–90% OEE before a third shift is justified [S6]. Ceiling and panel extruders plan in coil-coating line speed plus extrusion press throughput: Guangxi Nanning Saiyi Building Materials lists aluminum ceiling, baffle ceiling, grid ceiling, strip ceiling, and screen ceiling as main products from a Nanning, Guangxi base [S7], all of which ride on the same upstream billet supply the smelter plan drives.
Smaller-batch fabricators run a different planning rhythm. Shenzhen Du an Industrial schedules aluminum case, makeup case, tool case, and RC case output against CNC and sheet-bending cell hours, not tonnage [S5] — useful when the planner is matching a job-shop's monthly throughput to a customer's release schedule rather than to a continuous caster. The planning math is the same; the unit of measure changes from tonnes to pieces. For spec teams evaluating aluminum veneer panel and aluminum window and door suppliers, this means asking for monthly piece-count capacity at rated yield, not just press count.
Selection Criteria: When to Add Cells, Furnaces, or Presses
Three criteria decide where the next increment of capacity goes: bottleneck location, capital cost per tonne, and lead time. Smelter restart at existing amperage is the cheapest tonne on the table because civil work, rectifiers, and gas treatment are already in place — the 430,000 t/y Zhongwang block is a restart, not a greenfield [S3]. A new gas aluminum melting furnace is the next-cheapest tonne, sized by the casthouse's hourly demand. A new die-cast cell is more capital per tonne but is the right answer when the bottleneck is piece count, not metal.
Comparison against decision criteria:
• Potline restart — low $/t, 6–9 month ramp, constrained by grid power and restart crew availability; the Zhongwang 320-cell, 500 kA block scheduled end-October completion is the worked example [S3].
• Melting furnace add — moderate $/t, 3–6 month install, sized to casthouse demand; rated in kg/h melt and holding kg.
• Die-cast cell add — highest $/t, 4–8 month install, sized in clamping tonnes; Qingdao Rongmaofa lists it as a core auto-part and machine-part line under IATF 16949 [S6].
• Extrusion press / panel line add — moderate $/t, 6–12 month install, sized to billet supply; Saiyi's ceiling range covers the downstream pull [S7].
For 2026 planners, the rule of thumb is: restart potlines first, add melting and holding next, then debottleneck the cell that is the gating work center in the MPS [S4].
Standards, Certifications, and What They Mean for Capacity
Capacity numbers are only as good as the certification behind them. IATF 16949 on a die-cast shop signals automotive-grade process control — calibration, PPAP, and reaction-plan discipline — and is what justifies a 85–90% utilization target on a sustained run [S6]. ISO 9001 plus ISO 14001 on a building-products extruder is the baseline for consistent aluminum ceiling output and for the environmental management that increasingly gates export orders [S7]. For job-shop case makers, the absence of a listed certification is itself a planning input: cycle times, scrap rates, and on-time delivery must be verified before the shop is loaded above ~70% of namepiece capacity [S5].
Capacity-planning software sits on top of this — the same JD Edwards module that does RRP and Rough-Cut Capacity Planning for an aluminum extruder is the same shape Oracle documents for WebLogic server planning, where the bottleneck is concurrent sessions and measured TPS rather than cells and presses [S2][S4]. The vocabulary differs; the discipline is identical.
Limitations and Failure Modes
The most common planning failure is ignoring the rectifier: a 500 kA potline cannot run above its transformer rating, so "adding capacity" by tightening current efficiency targets without upgrading rectifiers is a paper exercise. The second is ignoring casthouse balance — a smelter restart that pushes more molten metal than the degasser and filter station can handle turns into a holding-furnace overflow, not a capacity gain. The third is ignoring IATF 16949 scrap budgets on die-cast lines [S6]; a shop running above its certified yield band is running on borrowed tonnage.
For job-shop case fabricators the failure mode is different: piece-count planning that ignores the aluminum ladder and panel finishing bottleneck will book orders the assembly cell cannot finish. For ceiling extruders, the bottleneck is usually powder-coating line speed, not press tonnage [S7]. The fix in every case is the same: identify the gating work center in the MPS before adding upstream capacity [S4].
Sourcing Signals and What to Track Next
Two signals are worth tracking into the back half of 2026. First, restart completion of the 320-cell, 500 kA, 430,000 t/y block at Yingkou Zhongwang, originally scheduled for end-2021 — any slip there propagates into 2026 billet supply [S3]. Second, the certification refresh cycle on Shandong die-cast shops running IATF 16949 [S6] and on Guangxi extruders running ISO 9001 / ISO 14001 [S7]; a lapsed certificate is an early indicator that a planned capacity increment will be pushed out. For job-shop case and makeup-case lines in Shenzhen, monthly piece-count utilization at the CNC and bending cells is the cleanest leading indicator [S5]. Related coverage on steel-side planning is useful for the same discipline: see this Steel Production Line Design spec map and this Steel Industry 4.0 adoption piece for the parallel logic in ferrous planning.