Precoated sand casting crankshaft

Part name: ductile iron sand casting crankshaft

Metal: Ductile iron or cast steel

Casting process: precoated sand casting or shell mold casting techniques

Precoated sand casting process, also known as shell mold casting, is one of resin coated sand casting techniques. Compared with resin sand casting method and green sand casting techniques, the pre-coated resin sand casting is the most precision casting process, even close to investment casting. Baoding Guokun precoated sand casting products are with better surface quality, less sand casting defects, and very high dimensional accuracy with general casting tolerance ISO 8062 CT8. If you need ductile iron sand casting crankshafts, please contact gina@guokuncasting.com to get the quotation.

Sand Casting Tags: ductile iron castings, air compressor parts

Description

Baoding Guokun Machinery Co., Ltd and Baoding Guokun Export and Import Trading Co., Ltd are located in Baoding city, Hebei province, China. Our sand casting factory occupies a total area of 30,000 square meters, which have casting foundry workshop, grinding, sandblasting and precision machining shop, laboratory and warehouse. Baoding Guokun has equipped with 4 sets medium-frequency electric furnaces, 15 sets automatic shell core machinery, automatic sand casting molding line, 7 sets CNC machinery, 20 sets CNC Lathe, and the complete quality inspection devices for mechanical testing and chemical analysis, including tensile strength, hardness tester, metallographic inspection, spectrometer, ultrasonic testing and special testing devices. Before shipping, the quality reports for all inspection will be issued and mailed to our customers.

The process of Baoding Guokun precoated sand casting involves several steps after producing a professional tool or mold, including:

No.	Steps	Details
1	Pattern Creation	A two-piece metal pattern is created in the shape of the desired part, typically from iron, aluminum or wooden material.For a single casting or small batches of castings, we prefer to produce to use the wooden material to manufacture the mold to save money for customers.For other sand casting parts in large quantity, we prefer to use aluminum or iron to improve the mold’s service life.
2	Mold creation	The two shell halves are joined together and securely clamped to form the complete shell mold. If any cores are required, they are inserted prior to closing the mold. The shell mold is then placed into a flask and supported by a backing material.
3	Pouring	The mold is securely clamped together while the molten metal is poured from a ladle into the gating system and fills the mold cavity.
4	Cooling	After the mold has been filled, the molten metal is allowed to cool and solidify into the shape of the final castings.
5	Casting removal	After the molten metal has cooled, the mold can be broken and the casting removed. Trimming and cleaning processes are required to remove any excess metal from the feed system and any sand from the mold
6	Machining	Machining as per drawings

Resin coated sand casting is a metal casting technique in which the sand mixed with a thermosetting resin is allowed to come into contact with a heated metallic pattern plate, so that a thin and strong shell of mould is formed around the pattern. Then the shell is removed from the pattern and the cope and drag are removed together and kept in a flask with the necessary back-up material and the molten metal is poured into the mold.

green sand casting workshop

But the molding material of precoated sand casting is a mixture of dry, fine silica sand with minimal clay content and 3~8 percent thermosetting resin. When the molding mixture drops on to the heated pattern plate, a hard shell of around 6mm~12mm thickness if formed. In order to cure the shell completely, it must be heated to 440 to 650°F for several minutes. And the shell mold casting process is no need to use the sand box when pouring. So the small footprint and less sand used in casting will cause less environmental pollution.

pouring of shell mold casting in Baoding Guokun sand casting factory

Shell mold casting advantage and disadvantage

Advantages: Can form complex shapes and fine details; Very good surface finish; High production rate; Low labor cost(if automated); Low tooling cost; Little scrap generated; Can produce very large parts; Can form complex shapes; Many material Options; Low tooling and equipment cost; Scrap can be recycled; Short lead time possible

Disadvantages: High equipment cost; Poor material strength; High porosity possible; Secondary machining often required; High labor cost(if done manually)

Shell moulding casting process has many advantages, including high quality surface finishes and dimension accuracy CT8, low tooling cost, complex shapes casting products, short lead times, wide material options.

Metals for precoated sand casting process

Precoated sand shell mold casting allows the use of both ferrous and non-ferrous metals, most commonly using cast iron, carbon steel, alloy steel, stainless steel, aluminum alloys, and copper alloys.

Gray iron shell mold casting, such as ASTM A48/A48M, ASTM A159, BS EN 1561, DIN 1691, etc

Ductile iron shell mold casting, such as ASTM A536, BS EN 1563, GB/T 1348-1988, etc

Carbon steel shell mold casting, such as ASTM A29/A29M(1030, 1040, 1045, 1050, etc)

Alloy steel shell mold casting, such as SAE J1249 (4140, 4340, 8140, 8630, etc)

Stainless steel shell mold casting, such as ASTM A959 (304, 316, 316L, etc)

Aluminum alloy shell mold casting, such as ASTM B85-96(ASTM A356, A360, A383), JIS H5302:2000(ADC10.1, ADC12, etc), GB/T 15115-1994(YL102, YL112, etc)

Bronze & copper alloys shell mold casting

A High Quality China Metal Casting Factory！

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 monthly capacity of 10,000kgs and with more than 15 years of experience ensure the short delivery and the highest valued iron & steel casting parts.