| Metal Casting Factory in China

Heavy-duty cast gearbox housings for industrial transmissions. We handle casting, machining, and finishing in-house – no middlemen, no delays.

Guokun Machinery produces custom cast iron gearbox housings for industrial transmissions. We offer full casting, machining, and finishing services with ISO-certified quality. Fast lead times and competitive pricing. Contact us for a quote today. gina@guokuncasting.com or 86-18132789710(WhatsApp)

Description

High-Quality Custom Cast Iron Gearbox Housing / Gearbox Body from Guokun Machinery

Guokun Machinery is a leading metal casting factory in China, specializing in the production of high-precision cast iron gearbox housings and cast steel gearbox bodies for heavy machinery, agricultural equipment, and industrial transmission systems.

Our gearbox housings are manufactured using advanced sand casting, lost foam casting, and shell mould casting processes, ensuring excellent dimensional accuracy, structural integrity, and surface finish. We work with a wide range of materials, including gray cast iron (GG20, GG25), ductile iron (GGG40, GGG50), and alloy cast steel, to meet diverse application requirements.

Key features of our cast gearbox housings:

Custom design & manufacturing based on customer drawings (OEM & ODM services available)
Strict compliance with ISO 9001 and EN 10295 standards
High precision machining (CNC turning, milling, boring) for bearing seats, mounting holes, and oil passages
Heat treatment options: stress relieving, annealing, quenching & tempering
Surface treatment: shot blasting, painting, phosphating, to prevent corrosion
100% inspection on critical dimensions, material composition, and casting quality before delivery

Our cast gearbox housings are widely used in agricultural machinery gearboxes, construction equipment transmissions, industrial gear reducers, and other heavy-duty applications, offering reliable performance under high torque, heavy load, and harsh working conditions.

As a professional casting manufacturer, we provide one-stop solutions from pattern making, casting, machining to surface treatment, with competitive prices and reliable lead times. We welcome custom orders based on your technical drawings and specifications.

What is lost foam casting process?

Lost-foam casting is a type of evaporative-pattern casting process that is similar to investment casting except foam is used for the pattern instead of wax. The lost foam casting techniques take advantage of the low boiling point of polymer foams to simplify the investment casting process by removing the need of melt the wax out of the mold. Compared with investment casting method and sand casting techniques, lost foam casting is one of the most cost-effective and environmentally friendly metal casting process for creating complex and intricate metal parts by using a foam pattern that evaporates when molten metal is poured into it:

Lost foam casting process
Create the foam pattern	Create the foam pattern: The pattern is made from pre-expanded polystyrene (EPS) that is heated in an aluminum die to expand and fuse the beads. The pattern can be carved, machined, or created using injection molding.
Coat the foam	A ceramic refractory coating is applied to the foam to protect it from the sand and create a barrier
Compact the sand	The foam pattern is placed in a flask and surrounded by unbonded sand, which is compacted using a vibration table.
Pour the metal	Pour the metal: Molten metal is poured into the flask, causing the foam to evaporate and leaving behind the metal
Remove the coating	Remove the coating: The refractory coating is removed to expose the metal part.
Surface treatment	Sandblasting and machine process.

Advantage of lost foam casting technique

Lost foam casting technique has the ability to create full, net-shape patterns with unparalleled dimensional accuracy and precision. And lost foam casting process can reduce the tooling cost, improve surface finish and minimal waste. Baoding Guokun can use lost foam casting process to produce various parts for automotive, marine, agriculture, military, motor and pump, and heavy truck applications.

Disadvantage of lost foam casting

Lost foam casting has a few disadvantages, including: high pattern costs, easily damaged patterns and non-reusable molds.

Helical Gearbox	Uses helical teeth, providing higher efficiency and quieter operation than spur gears.
Planetary Gearbox	Known for high torque density, compact size, and efficiency, making them suitable for precision applications in aerospace and robotics.
Worm Gearbox	Utilizes a worm (screw) and gear for high reduction ratios, offering a self-locking mechanism for safety.
Bevel Gearbox	Used for applications requiring right-angle power transmission with high speed or high performance.
Spur Gearbox	A simple, efficient, and cost-effective design, though often noisier

Contact us today for a free quote on custom cast iron gearbox housings!

A High Quality China Foundry！

Guokun Casting, of Baoding Hebei is an ISO 9001-2008 registered iron and steel foundry & supplier of high quality carbon steel, cast iron and machined castings used in power, mining, railway, agricultural, tillage, truck, automobile, pump, valve, motor, pipe fittings and gear industry.

With a daily capacity of 10,000kgs and with more than 25 years of experience ensure the short delivery and the highest valued iron & steel casting parts.