Hansheng Automation (Dongguan) Co., Ltd. is one of the most experienced manufacturers and suppliers of grey cast iron sand casting in China. If you're going to wholesale bulk cost-effective grey cast iron sand casting made in China, welcome to get pricelist and quotation from our factory. Also, customized service and OEM&ODM service are available.
Hansheng Automation specializes in the field of automation and supply various precision components. With the devlopment of company, we also can supply various castings, which are applied in many industries.Grey cast iron sand casting is mainly applied in the field of automotive and mechanical manufacturing.
Feature
Complex shapes
Grey cast iron has excellent fluidity and coagulability and sand casting is very suitable for manufacturing work blank which has complex shape, especially has complex internal cavity. So grey cast iron sand casting can have various complex shapes.
Low cost
The cost of grey cast iron is relatively low, so it is suitable for production with small and medium batch and could be applied in some applications which are sensitive to cost.
high strength and high hardness
Grey cast iron has high strength and hardness, so it can fulfil some applications which have high requirements for strength and hardness. Meanwhile, it has good wear resistance, so it could be applied to some applications which need wear resistance, such as mechanical parts, automotive parts, etc.
wide adaptability
Grey cast iron has wide adaptability, and it could be applied to various alloys. The dimensions of castings are out of restriction.
Excellent corrosion resistance
Grey cast iron has excellent corrosion resistance, and it could be applied in aggressive environment. Besides, grey cast iron also has good heat resistance, and it could be applied in high resistance environment.
Good lubricity
Grey cast iron has good lubricity. It has good wear reduction when it is used for manufacturing the parts on the mechanical and electrical equipment which endure sliding friction. Graphite is an excellent lubricant when moisture exits, the space left when graphite falls off the matrix is conducive to retaining lubricating oil. This is also one of important conditions that grey cast iron is to be wear-resistant material.
Compared with other casting processes
|
Comparison dimension |
Sand casting |
Die casting |
Investment casting |
|
Cost |
Low (less investment in raw materials/equipment) |
High (High cost of metal molds) |
High (Complex wax mold/shell process) |
|
Applicable in bulk |
From single pieces to large quantities |
Large quantity |
Medium and small batch precision parts |
|
Casting complexity |
High (capable of forming complex inner cavities |
Medium (suitable for simple to moderately complex parts) |
High (near net shape) |
|
Material compatibility |
Gray cast iron, ductile iron, cast steel, etc. |
Non-ferroalloys (such as aluminum, zinc, etc.) |
All kinds of alloys (including high-temperature alloys) |
Process
Mold manufacturing
Firstly, based on the drawings and the requirements of customers, wooden molds or clay molds for carving and casting are manufactured. Finally, metal molds with high precision is formed after being shaped through processes such as compression and vibration.
Sand mold preparation
The process flow for preparing sand molds includes sand selection, cleaning, sorting, drying, sand mixing, mold making, baking, etc. During this process, it need to pay attention to the selection of sand, the control of its moisture content and viscosity, as well as the preheating and pre-impregnation of the mold.
Casting
The casting could be carried out after the preparation of mold and sand mold. Before casting, it need to inspect the mold surface whether there are defects on it (such as cracks, slag spots, etc.). At the same time, preheating it to a dry state to ensure the quality of the grey iron casting. Next, the casting is heated to a certain temperature and then is poured into the mold. The casting needs to cool and solidify; this process is called setting which often requires special equipment such as water coolers and baking ovens.
Sand Core Fabrication
During grey iron casting, due to the interior of some castings has cavities or complex geometric structures, it requires fabricating sand core before casting and then ensure the quality of castings. The fabrication process of sand core is similar to sand mold preparation, but it requires higher precision and technology.
Cleaning and Treatment
After casting is completed, the sand mold and sand core need to be removed, which is called peel off. It is usually carried out by methods of mechanic or manual. And then further processing is carried out, such as deburring and grinding. In addition, it requires other treatments, such as pickling, heat treatment, and surface coating.
Application
FAQ
Q: Why choose gray cast iron sand casting?
A: Depending on the advantages such as low cost, high adaptability, mature technology, it has become the mainstream production method of gray cast iron parts, especially suitable for complex shapes and multi-batch demand scenarios.
Q: What are the core advantages of gray cast iron sand casting?
A: The core advantages are reflected in three aspects: material cost, process flexibility and the adaptability of casting performance. Gray cast iron itself has good fluidity and shrinkage compensation capacity, and is highly compatible with sand casting processes, which can reduce defects such as porosity and shrinkage porosity.
Q: Is sand casting important in the field of gray cast iron?
A: Sand casting accounts for over 80% of the application of gray cast iron, and it is irreplaceable, especially in industries such as automobiles and machinery.
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