Brief introduction of nodular cast iron

Nodular cast iron is a kind of high strength cast iron material developed in the fifty "s in twentieth Century. Its comprehensive performance is close to that of steel.Based on its excellent performance, it has been successfully used in the casting of some parts with complex strength, toughness and wear resistance.Nodular cast iron has been rapidly developed as a very wide range of cast iron.

Nodular graphite cast iron is obtained by the ball and inoculation process. It can improve the mechanical properties of the cast iron, especially improve the ductility and toughness.

Nodular cast iron

Cast iron is containing carbon content greater than 2.11 percent of iron carbon alloy, produced by high temperature melting and casting industrial pig iron, scrap steel, iron, steel and alloy material. Except for Fe, containing and other cast iron carbon graphite morphology of the precipitated, if the precipitation of graphite is a sheet of iron called grey cast iron, flocculent iron called white cast iron , and spherical cast iron is called nodular cast iron.

The chemical composition of ductile iron in addition to iron is usually as follows: 3 to 4% carbon content, containing silicon content of 1.8 to 3.2%, with manganese, phosphorus, sulfur content less than 3% and the amount of rare earth, magnesium, etc..


This blog is  published by the nodular cast iron manufacturer RUYI FOUNDRY CO., LTD.

Properties of gray cast iron

The mechanical properties of gray cast iron are related to the microstructure of matrix and graphite.

Serious flake graphite in gray cast iron matrix of the fragmented, easy cause stress concentration in graphite in pointed, leading to the tensile strength of gray cast iron, making the plasticity and toughness much lower than that of steel, but the compressive strength is same to the steel, is also commonly used in cast iron parts in mechanical properties of the cast iron.At the same time, the matrix structure of gray cast iron has a certain effect on the mechanical properties, the ferrite matrix gray cast iron graphite sheet is thick, the strength and the hardness is lowest, so the application is less; The graphite sheet of the pearlite matrix gray cast iron is small, and has high strength and hardness, which is mainly used to manufacture more important grey iron casting; The graphite sheet of a pearlite matrix gray cast iron is slightly thick, and the performance is not as good as the pearlite gray cast iron. Therefore, the industrial use of the pearlite matrix of gray iron. Gray cast iron has good casting properties, good vibration reduction, good abrasion resistance, good cutting performance and low notch sensitivity.

This blog is  published by the grey iron casting manufacturer RUYI FOUNDRY CO., LTD.

Grey Cast Iron

Grey cast iron, or gray iron, is a type of cast iron with a graphitic microstructure. And its name comes from the gray color of the fracture it forms, and this is because of the presence of graphite. Now, grey cast iron is the most common cast iron based on weight.

Grey cast iron is widely used for casting parts, for which the the stiffness of the component is more important than its tensile strength, such as, valve bodies, pump housings, internal combustion engine cylinder blocks, electrical boxes, and decorative castings. With the high thermal conductivity and specific heat capacity, grey cast iron is often exploited to make cast iron cookware and disc brake rotors.

RUYI CASTING can offer the professional service of grey iron casting. Our advanced casting machining plant with over 9 NC and CNC machining centers can ensure the effectively and precision production. And now the one-stop service from molding design and casting production to precision machining has brought us a satisfaction and trust from our customer, who are mainly from Canada, USA, Switzerland, Sweden and other European countries. If you want to join them, please email us to sales@ruyicasting.com .

Green Sand Casting Process

These expendable molds used to make the mold's shape in green sand casting process are made of wet sands, which is not a type of green color sand, but a mixture in the sense that it is used in a wet state, akin to green wood. The wet sands usually contains:
silica sand , chromite sand, zircon sand, olivine, staurolite, or graphite;
clay;
water;
inert sludge;
Anthracite.

In green sand casting process, the sands for non-ferrous metals does not use coal additives, because the CO created is not effective to prevent oxidation. Green sand for aluminum typically uses olivine sand, which is a mixture of the minerals forsterite and fayalite. Furthermore, the choice of sand can make a difference on the temperature that the metal is poured.

Ruyi Casting owns a advanced automatic moulding line, which is exactly suitable for such green sand casting process. Our advanced moulding machine as well as the stable sand preparation system can guarantee the high efficiency production and stable quality. And now we have built good relationships with customers from Canada, USA, Switzerland, Sweden and other European countries. If you have the interest in our service, please email us to sales@ruyicasting.com .

Shell Molding Process

Introduction:

Shell molding is similar to sand casting, but there is something different. In the process of sand casting, the molding cavity is a flask filled with sand, but in that of shell molding process, the molding cavity is formed by a hardened "shell" of sand instead. The sand used in shell molding process is finer than that in sand casting process, and it is mixed with a resin so that it can be heated by the pattern and hardened into a shell around the pattern.

Advantages:

Due to the resin and finer sand, shell molding process gives a much finer surface finish.
This kind of casting process is easily automated and more precise.
Common metals can be used, including cast iron, aluminum, magnesium, copper alloys,etc.
Shell molding process is exactly suitable for complex items which are small or medium-sized.
Shell molding process offers better dimensional tolerances
Shell Molding Process offers higher throughput due to reduced cycle times.

Why choose us:

With more than 10 years development, RUYI CASTING has become a professional manufacturer of shell molding parts used for autos. Our advanced machinery and technology as well as professional staff will give you the excellent service. If you have interest in our service, please email us to sales@ruyicasting.com .

Sand Casting Plant

Sand casting, the other name sand molded casting, is a kind of metal casting process with the feature that using sand as the mold material. It is widely used, and over 70% of all metal castings adopts the sand casting process.

Sand casting is relatively cheap and sufficiently refractory suitable for steel foundry. Besides the sand, a suitable bonding agent, such as clay, is usually mixed with the sand. The mixture is moistened, with water or sometimes other substances, to develop strength and plasticity of the clay so as to make it suitable for molding.

RUYI CASTING can offer the service of Green Sand Casting and No-Bake Resin Sand Casting. As a professional manufacturer of casting parts in China, we have the advantages of advanced casting machinery, professional staff and excellent service. Today, most of our products are exported to Canada, USA, Switzerland, Sweden and other European countries, from which we have received good feedback. Furthermore, if you have special requirement of the parts, please email us your design drawing to sales@ruyicasting.com .

Precision CNC Machining

Machining Facility We Have:
Vertical Milling Center
Horizontal machining center
Gantry milling machine
CNC Turning Machine
Vertical machining center with four axles

Numerical control (NC) refers to the automation of machine tools, which means machine tools are operated by precisely programmed commands encoded on a storage medium, instead of being controlled manually via hand wheels or levers, or mechanically automated via cams alone. Today, Most NC is computerized numerical control (CNC), and the computer plays an integral part of the control.

RUYI CASTING has introduced the most advanced precision CNC machinery, and in the precision CNC machining, parts can goes directly from the former machinery to the next machinery without manually control, which can save much time for completing the parts. Combined with the coordinate measuring machine, we can ensure to achieve the key dimensions you require. Otherwise, the customized design of parts can be acceptable, and if you have special requirements, please email us to sales@ruyicasting.com . We will give you fast response as soon as possible.