Iron Casting manufacturer

Character: Sand-mold casting is adaptable to a very wide range of alloys, shapes, sizes, and production quantities. Hollow shapes can be produced in these castings through the use of cores. Sand-mold casting is by far the most common casting process used in industry;

Option for Green Sand Casting

green sand molds are composed of a particulate or granular material, typically sand, which is held together with a binder such as a mixture of clay and water. These molds may be manufactured rapidly for simple molds in an automated mold making plant.

Green sand molding is currently the most widely used of all sand casting methods, Green sand refers to the fact that water is added to activate the clay binder.

Technique and capacity:

Ningbo Ruyi Foundry Co., Ltd. is your reliable source for Ductile iron casting, Grey iron casting .The molding process covers Resin Chemically Bonded Sand Cast, Resin Shell Cast, and Green Sand Cast. We can also offer the advantage brought by our strategic long-term partner with diversified technique( Investment casting for steel, ,carbon steel,stainless steel, pressure die casting and gravity casting for aluminum, alloy, aluminum & zinc , as well as precision machining with general machine tool and CNC machines) so as to make customization easy to carry out . Our integral service concept brought us high praise from our customers from all over the world. Most of our products are exported to Canada, USA, and Europe Spain , Italy, Switzerland, Sweden, and so on etc. and win good reputation among our customers .

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. cnc machining

Technorati : Green Sand Casting

Technorati : CNC machines

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.

Cast iron is one of the common & mostly used materials for making table bases. Due to its abundant availability, simplicity and low cost, it became a viable and easy choice for all. May be it can be the reason why it is commonly used.

Sand casting is the mainly used way of producing cast iron table bases. It is the most primitive and simple way of making cast iron products. In a cast iron foundry, all you need to have is an oven to melt down the iron ingots, molding of the products and a fresh sand field. The making method is also very simple. When the iron is melt down to liquid, pour that into the pre-molded sand box, wait until it is cool down, break those sand boxes and clean them well. Afterward paint them in colors and pack them into boxes. Now it is ready for the market.

Most of the table bases made by cast iron are very heavy and strong, so, it is used mainly for strength and stability of the table. Therefore, most of the cafe and restaurants use such bases for this very reason.

We might also notice that all the sand casting bases are painted in black. The reason for that is mainly to disguise the roughness of the surface made by sand casting. Due to modern method and equipment, good quality can be achieved. Nevertheless, black is still the very much preferred and used paint for such items.

With the existing new method, bigger and decorative products are possible these days. The quality standard and designs also have improved a lot recently. We are spoiled with choices today, but the main reason for having a cast iron table base is still the same as it was 30 years ago! It has always been and will be for the strength and stability!
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