Archive for April, 2009

Grey cast iron also known as flake graphite cast iron

Tuesday, April 28th, 2009

Grey cast iron also known as flake graphite cast iron, is a type of casting iron in which most of the carbon is present as flake graphite .The propertises of grey cast iron depends on the distribution, sizs and amount of graphite flakes, and the matrix structure. These factorys are in turn, influenced mainly by the manufacturing conditions, chemical composition, solidification time and rate of cooling in he mould. Grey cast iron exhibit low to moderate strength, low modulus of elasticity, low notch sensitiviy, high thermal conductivity, moderate resistance of thermal stock , and outstanding castability.

Automotive Parts For Grey Iron Casting

Automotive parts Grey Iron Casting

we can supply casting according to drawings or samples. the material could be grey cast iron, ductile cast iron, steel etc. we also supply machining. products weigh could be 0.3kg to 10tons.

grey iron casting

1.Material:most products are made by stainless steel. Iron (SPCC, ,SECC, SPTE, tinplate), aluminum alloy,red copper, brass, bronze alloy are also workable.
customer’s drawings are accepted
2.Process:stamping,deep drawing,welding,sheet metal fabrication,and metal assembly.
3.Surface treatment:Professional stainless steel polishing or grinding by own workshop.Plating,coating,anodizing are also workable.
4.Application:auto part,industrial part,machinery part,building part,and household hardware,etc.
Capacity:stamping:8-300 tons;deep draw:up to 350 tons.
We always focus on the product quality,customer needs,prompt delivery and good customer service.If you have any requirements, just contact us!
Minimum order: according to customers requirements.
Sample: sample for free, but you should pay for the express fee for the samples.

Delivery date:

1 Making the moulds within 10-15 days after receipt the 30% payment in advance.
2 The first container is delivered within 10-15 days after the sample is eligibled
Packing methods: ply wooden case/pallet with plastic layer,or as per customer’s requirements
Packing size: 1800mm*1000mm*1200mm
2according to the products size and quantity.
G.W.: 20000kgs-23000kgs
N.W.: 18000kgs — 20000kgs
Packing size: according to the products size and quantity.
Brand: our brand is XSY, if you need us to put your own logo on the product, it is ok.

OEM: yes
Our enterprise has passed ISO9001:2000 Quality System Certificate, and ISO14000 Environment System Authentication, if need, we could provide Certificate Paper.
please visit our website or you can ask me via email.


Technorati :

Posted in Iron casting | No Comments »

Ductile iron casting

Friday, April 24th, 2009

Ductile iron casting as found wide acceptance and competes favourably with steel such that its use in engineering has increased in recent times as while grey cast iron and malleable cast iron has fallen in popularity as other materials such as plastics have found favour.

Ductile iron casting has a clear advantage over malleable iron for applications where low solidification shrinkage is needed or where the section is too thick to permit uniform solidification as white iron

Iron castings can be referred to as products made out of melted iron molecules. These molecules are, first, poured into mold and allowed to cool. They are then extracted. The casting properties depend a great deal on the foundry practice. They also depend on the cooling rate. Iron contains huge carbon concentrations. This content facilitates melting, simplicity of casting, and machining. Iron casting designs have a great variation owing to the property of iron to resist shrinkage during the process of cooling. The end product attains a great reputation for its strength and durability. Tensile strength ranges between 20,000 psi and over 60,000 psi. The values of hardness (without heat treatment) range between 100 and 300 BHN.

Some factors need to be considered while buying iron castings. The first thing on the agenda should be, checking the quality of foundry used in products and procedures. This should be done because foundry practices determine the casting properties. The consumer might have a tough time in finding the apt one. Secondly, the concentration of carbon should be looked into. The percentage of carbon commonly ranges between 2.5 and 4%. An addition of even 0.1% would cause the tensile strength to decrease by around 2700 psi. Casting procedures differ from foundry to foundry.

Exedy is Japan’s leading supplier of racing clutches. It has gained a reputation of quality in its range of clutches. As a fact, racing and performance clutches of the company are designed, engineered and created to satisfy the standards of race clutches. They are not made from gray cast iron, which are manufactured from stock clutches. Compared to other performance clutch companies, Exedy uses ductile iron pressure plates to enhance safety especially in driving in harsh performance environments.

Green sand molding is the most commonly used type of casting. Normally, small and medium sized products are produced using this type of casting. Shell molding is preferred for bigger applications. Shell molding facilitates cooling of the mold containing heated metal. This process gives a better finishing to the final product as compared to all the other processes. Centrifugal casting is used for producing big cylinders and pipes. Both, producer and consumer would get highly satisfied if a proper blend of correct casting process and reputed foundry is made.

Iron castings are utilized extensively in machinery, automotive, and agricultural industry. Parts such as turbine and pump housings, dynamometer bases, compressors are made out of iron castings. Majority of manufacturers have the caliber to go for high and low production outputs. They are also entitled to go for short order runs. There are standard prototypes ensuring customer satisfaction and accuracy. Some manufacturers provide finishing services like galvanizing, painting, and machining as well. In general, iron castings include alloy casting, ductile castings, and malleable castings. There are some terms relating to iron castings. They need to be known in order to get a fair idea of iron.

Die Casting, cnc machining


Technorati :

Posted in Iron casting | No Comments »

Iron Casting Information and the Process of Iron Casting

Saturday, April 18th, 2009

Ningbo Ruyi Foundry Co.,Ltd. is your reliable source for Ductile iron casting, Grey iron casting and you can also entrust us for Stainless steel casting, Aluminium alloy casting and Refractory steel casting. The moulding process covers Resin Chemically Bonded Sand Cast, Resin Shell Cast, and Green Sand Cast . Based on the land of size 6000 square meters , the foundry’s monthly iron casting output capacity is up to 350 tons, and 80% of the produced castings are sold to overseas markets .Our castings mainly apply to Machine tools industries Pumps industries Gas steam valve industries Automobile industries Air compressor industries Gear cases accessories Electric motor body accessories Other products.

Iron castings can be referred to as products made out of melted iron molecules. These molecules are, first, poured into mold and allowed to cool. They are then extracted. The casting properties depend a great deal on the foundry practice. They also depend on the cooling rate. Iron contains huge carbon concentrations. This content facilitates melting, simplicity of casting, and machining. Iron casting designs have a great variation owing to the property of iron to resist shrinkage during the process of cooling. The end product attains a great reputation for its strength and durability. Tensile strength ranges between 20,000 psi and over 60,000 psi. The values of hardness (without heat treatment) range between 100 and 300 BHN.

Some factors need to be considered while buying iron castings. The first thing on the agenda should be, checking the quality of foundry used in products and procedures. This should be done because foundry practices determine the casting properties. The consumer might have a tough time in finding the apt one. Secondly, the concentration of carbon should be looked into. The percentage of carbon commonly ranges between 2.5 and 4%. An addition of even 0.1% would cause the tensile strength to decrease by around 2700 psi. Casting procedures differ from foundry to foundry.

Green sand molding is the most commonly used type of casting. Normally, small and medium sized products are produced using this type of casting. Shell molding is preferred for bigger applications. Shell molding facilitates cooling of the mold containing heated metal. This process gives a better finishing to the final product as compared to all the other processes. Centrifugal casting is used for producing big cylinders and pipes. Both, producer and consumer would get highly satisfied if a proper blend of correct casting process and reputed foundry is made.

Iron castings are utilized extensively in machinery, automotive, and agricultural industry. Parts such as turbine and pump housings, dynamometer bases, compressors are made out of iron castings. Majority of manufacturers have the caliber to go for high and low production outputs. They are also entitled to go for short order runs. There are standard prototypes ensuring customer satisfaction and accuracy. Some manufacturers provide finishing services like galvanizing, painting, and machining as well. In general, iron castings include alloy casting, ductile castings, and malleable castings. There are some terms relating to iron castings. They need to be known in order to get a fair idea of iron.


Technorati : ,

Posted in Iron casting, sand casting | No Comments »

Sand casting is used to make large parts

Saturday, April 11th, 2009

Sand casting is used to make large parts (typically Iron, but also Bronze, Brass, Aluminum). Molten metal is poured into a mold cavity formed out of sand (natural or synthetic). The processes of Sand casting are discussed in this section, include patterns, sprues and runners, design considerations, and casting allowance.

Patterns:
The cavity in the sand is formed by using a pattern (an approximate duplicate of the real part), which are typically made out of wood, sometimes metal. The cavity is contained in an aggregate housed in a box called the flask. Core is a sand shape inserted into the mold to produce the internal features of the part such as holes or internal passages. Cores are placed in the cavity to form holes of the desired shapes. Core print is the region added to the pattern, core, or mold that is used to locate and support the core within the mold. A riser is an extra void created in the mold to contain excessive molten material. The purpose of this is feed the molten metal to the mold cavity as the molten metal solidifies and shrinks, and thereby prevents voids in the main casting.

In a two-part mold, which is typical of Sand casting, the upper half, including the top half of the pattern, flask, and core is called cope and the lower half is called drag. The parting line or the parting surface is line or surface that separates the cope and drag. The drag is first filled partially with sand, and the core print, the cores, and the gating system are placed near the parting line. The cope is then assembled to the drag, and the sand is poured on the cope half, covering the pattern, core and the gating system. The sand is compacted by vibration and mechanical means. Next, the cope is removed from the drag, and the pattern is carefully removed. The object is to remove the pattern without breaking the mold cavity. This is facilitated by designing a draft, a slight angular offset from the vertical to the vertical surfaces of the pattern. This is usually a minimum of 1 or 1.5 mm (0.060 in), whichever is greater. The rougher the surface of the pattern, the more the draft to be provided.

Sprues and Runners

The molten material is poured in the pouring cup, which is part of the gating system that supplies the molten material to the mold cavity. The vertical part of the gating system connected to the pouring cup is the sprue, and the horizontal portion is called the runners and finally to the multiple points where it is introduced to the mold cavity called the gates. Additionally there are extensions to the gating system called vents that provide the path for the built up gases and the displaced air to vent to the atmosphere,

The cavity is usually made oversize to allow for the metal contraction as it cools down to room temperature. This is achieved by making the pattern oversize. To account for shrinking, the pattern must be made oversize by these factors, on the average. These are linear factors and apply in each direction. These shrinkage allowance are only approximate, because the exact allowance is determined the shape and size of the casting. In addition, different parts of the casting might require a different shrinkage allowance. See the casting allowance table for the approximate shrinkage allowance expressed as the Pattern Oversize Factor.

Sand castings generally have a rough surface sometimes with surface impurities, and surface variations. A machining (finish) allowance is made for this type of defect. See casting allowance table for the finish allowance.

Posted in sand casting | No Comments »