Description

About us:

Guokun Casting, of Baoding Hebei is an ISO 9001-2015 registered iron and steel foundry & supplier of high quality stainless steel, alloy steel, carbon steel, cast iron, aluminum alloy, bronze and machined castings used in power, mining, railway, agricultural, tillage, truck, automobile, pump, valve, motor, pipe fittings and gear industry.

With a monthly capacity of 100,000kgs and with more than 25 years of experience ensure the short delivery and the highest valued iron & steel casting parts.

Reducer housing, also known as gearbox housing, is the load-bearing shell of speed reducers. It accommodates gears, shafts, bearings and lubricant, requiring good rigidity, vibration damping, sealing performance and dimensional stability. The commonly used materials are gray cast iron HT200 / HT250 (EN-GJL-200 / EN-GJL-250) and ductile iron QT450-10 (EN-GJS-450-10). The mainstream forming processes are resin-bonded sand casting (furan no-bake sand) and lost foam casting (LFC, expendable pattern casting).

Process Introduction

Resin sand casting (furan no-bake sand) is a chemically bonded sand casting process. Silica sand is mixed with furan resin binder and acid catalyst, which cures at room temperature without baking or drying. It is widely used for gearbox/reducer housings, pump casings, valve bodies and other medium-to-large iron castings (HT200, HT250, QT450‑10).

Process:

1. Pattern & core designA metal pattern is manufactured with casting shrinkage allowance. Sand cores are made to form the complex inner cavity, bearing seats and rib structures. Gating and riser system is designed with solidification simulation to realize directional solidification and avoid shrinkage porosity at hot spots. Bottom gating is preferred for stable metal flow and less slag entrapment.

2. Molding & core assemblyFuran resin self-hardening sand is mixed and molded. After curing, the mold halves are closed, sand cores are positioned and locked. Sufficient vents are arranged for gas exhausting during pouring.

3. Melting & pouringMolten iron is smelted in induction furnace, and composition is verified by spectrometer. Pouring temperature for gray iron is normally 1360–1440 ℃. Molten metal fills the cavity steadily through the gating system.

5. Shakeout, cleaning & stress reliefAfter cooling, the casting is shaken out, risers and gates are cut off, and surface cleaning is carried out. Stress-relief annealing / normalizing is adopted to eliminate residual casting stress and prevent later deformation during machining.
6. Inspection & machiningVisual inspection, UT (ultrasonic test) and penetration test are performed. Flange faces, bearing bores and bolt holes are finished by CNC machining, followed by oil leakage test.

Process Comparison & Selection

• Resin sand casting: Better dimensional accuracy, stable surface quality, easy core making; suitable for heavy-duty, large-size reducer housings. Higher mold cost.
• Lost foam casting: No parting line, fewer cores, lower pattern cost for complex thin-wall housings; fewer flash and burrs. Strict control needed for gas defects and carbon defects.

Resin sand casting (furan no-bake) features rigid mold, stable dimension, good surface quality and strong coring ability. It is the preferred process for medium & large reducer housings with complex inner cavity and high machining requirement.

Guokun possess a comprehensive, integrated production line covering shell molding, casting, and machining, enabling us to manufacture motor housings according to your design drawings. Our high-quality castings will support your efforts in developing new markets; please feel free to contact us for a quote.

We offer one-stop secondary services: CNC machining, tapping, shot blasting, painting and material testing. Strict inspection covers dimension, chemical composition and internal defects. We guarantee stable quality, consistent delivery cycles and favorable prices for motor manufacturers.

Send us your drawing for a competitive quotation.

Baoding Guokun Machinery Co., Ltd.

Baoding Guokun Export and Import Trading Co., Ltd

Office Add: 777# Chaoyang South Street, Baoding City, Hebei, 071000, China

Workshop 1 Address: Wangdu County, Baoding City, Hebei, 071000, China

Workshop 2 Address: Economic Development zone, Hebei Province, China.

Website: www.guokunfoundry.com

Tel: 86-312-5951319 Fax: 86-312-5951296

Phone: 86-181 3278 2327 (WhatsApp & WeChat)

Email: andy@guokuncasting.com 

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