CustomPartNet
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October 20, 2026
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Updated October 20, 2026
A smart first move is to narrow the supplier list to foundries that match your needs, such as ductile iron experience, the casting weight range they handle, or required certifications. Location counts as well, because heavy castings are costly to ship and distance can affect lead time. For seasonal equipment programs and long-term supply, the right foundry can matter as much as the design. Ask to see sample castings similar to yours, since a real casting shows surface quality and workmanship far better than a quote sheet. Browse our supplier network to compare qualified Illinois suppliers, examine sample parts, and request quotes.
Sand casting is the most widely used casting process. It uses expendable sand molds to form complex metal parts from nearly any alloy, and parts can range from a couple of ounces to several tons. Because the sand mold is destroyed to remove the casting, the production rate is typically low, but the flexibility in size, shape, and material is hard to beat.
The process begins with mold-making. Sand is packed around a pattern, which is a replica of the external shape of the casting, in each half of the mold. When the pattern is removed, a cavity remains. Any internal features, such as holes and passages, are formed by separate sand cores placed in the mold.
Once the mold halves are closed and clamped, molten metal is ladled from the furnace and poured into the cavity. The metal cools and solidifies into the shape of the casting.
After the predetermined cooling time, the sand mold is broken and the casting is removed, a step often called shakeout. Excess material from the gating channels is then trimmed off, and shot blasting can clean remaining sand from the surface.
Ductile iron is a cast iron alloy that gives agricultural equipment makers a useful mix of strength and toughness at a moderate cost:
High strength and good ductility compared with other cast irons
Good impact and fatigue resistance for parts that see shock loads in the field
Wear resistance for parts that move through soil
Good machinability after casting
Cast iron melts at roughly 1990 to 2300 °F, a range sand casting handles well
Cost-effective for medium to heavy parts
The main tooling is the pattern, a full size model of the part that makes an impression in the sand. It is made slightly larger than the part because the casting shrinks as it cools. Patterns can be made of wood, plastic, or metal. Wood is inexpensive and easy to shape but wears faster, while metal costs more and lasts longer with higher tolerances. Core boxes are the second part of the tooling, used to make the sand cores.
Several pattern types are used, depending on the part and quantity:
Solid patterns for simple shapes at low quantities
Split patterns for more complex parts at moderate quantities
Match-plate patterns for larger quantities and automated molding
Cope and drag patterns for larger castings where a match plate would be too heavy
Some design guidelines that help castings come out clean:
Keep wall thickness as uniform as possible, since thick sections can become hot spots that cause shrinkage, porosity, or cracking
Round inside corners to at least the wall thickness
Apply a draft angle of 2° to 3° on walls parallel to the parting direction
Add 0.0625 to 0.25 in. of machining allowance where a smooth surface is required
Ductile iron sand casting is used across agricultural equipment manufacturing to produce:
Tractor housings and transmission cases
Gearbox and differential housings
Wheel hubs and spindles
Counterweights and ballast
Planter and seeder components
Tillage equipment brackets and shanks
Pump and sprayer housings
Axle and drive components
Hitch and linkage parts
Combine drive and bearing housings
Illinois suppliers support prototype and production programs for equipment OEMs, dealers, and contract manufacturers throughout North America.
It offers strength, toughness, and wear resistance at a reasonable price. Farm equipment faces heavy loads, vibration, and abrasive conditions, and ductile iron handles these well while remaining easy to cast into complex shapes.
Cost depends on several factors. Material cost includes the metal, the melting, and the mold and core sand, and it rises with part weight. Tooling cost depends mainly on the pattern and core boxes, which are driven by part size and complexity. Production cost covers core-making, mold-making, pouring, and cleaning. Ask suppliers for quotes at several volumes to see how price changes.
Sand casting handles a very wide range, from a few ounces to several tons. That makes it one of the few processes that can produce both small brackets and heavy housings or machine bases.
Often, yes. Cast surfaces are rougher than machined surfaces, so critical features such as bearing bores and mounting faces are usually machined. Designing in a machining allowance lets the foundry and machine shop work from the same plan.
Most defects trace back to the way the metal solidifies, so uniform walls, good gating design, and the right pouring temperature are key. Common issues include porosity, hot tearing, and unfilled sections. A good foundry will review your design and suggest changes.
Yes. Because patterns are less costly than hard tooling for other processes, sand casting is often a good fit for prototypes and low to moderate volumes. Higher volumes can use match-plate or cope and drag patterns with automated molding.
Yes. Many Illinois suppliers offer pattern making, casting, heat treating, machining, finishing, and assembly, so you can often work with one source from pattern to finished part.
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