Green Sand Molding Adopted in Sand Mold Casting

Green sand moldingIn sand mold casting, the sand casting and green sand molding, generally, can be thought of as interchangeable terms, for the same sand mold casting process. During the sand mold casting process, the sand casting process – or green sand molding process – is the most commonly used Casting Process in sand mold casting manufacturing. The alloys used most in green sand and sand castings, are aluminum, brass, bronze, and iron products.

The moisture factor in the sand is the reason we say green sand basically in the sand mold casting industry. In sand mold casting process, green sand can mill and mix all kinds of additives, clay and other chemical binders. So the green sand is very suitable for sand mold casting.

With a unique pressure and temperature, the sand compound we mixed and formed well can be placed around the pattern. By this way, we can guarantee that the shape will not change during the left sand mold casting process. The blended sand and binders are compacted around the pattern, taking on the shape of the desired casting. So the green sand molding performs a good way in sand mold casting especially in today modern industrial business.


Sand moulding process

sand moulding processUsing the cores which is a seperate inserts, the interior cavities of a casting can be formed in the sand moulding process. Mostly we use sand and backed to make the cores which we use to make the interior cavities of a casting. In a mold frame which we call it flask, there are two parts the upper part which we name it cope and the lower part which we name it drag. In the process of pattern molding, a mold cavity is formed during the sand moulding process. When the pattern which commonly wooden material is embedded in sand in the flask can form an impression of the casting. The pattern is removed from the flask and the cores and the gating system in sand mold casting are arranged very well after the sand packing finished.

In the sand mould casting equipment, some parts need to be placed very well in the upper part and lower part of the mold frame. The inner part we name it core, the inner running way we name it runner and also the gate. The pouring cap and other part sprue are just well placed them in the cope part in the mold frame. After the sand moulding process, the two parts of the mold are assembled and poured. Shakeout process will be made after the metal has solidified and cooled to a needing temperature we ask, the casting is removed from the mold.

So the of sand moulding process is running step by step which can satisfy the need of our manufacturing.


Sand casting pattern adopted for sand mold casting

During sand mold casting, in order to be used repeatedly sand casting pattern are made of relatively tough materials. There are many sand casting pattern materials such like wood, metal, and plastic. A parting and releasing agent is applied on the pattern surface so it can provide a easy removal of the pattern from the mold.

Sand casting patternSand casting pattern is very important in sand mold casting. Sand casting pattern may be made as one-piece or multiple-piece like split and match plate. In sand mold casting, the sand casting pattern we used are commonly made larger than the casting because of the shrinkage effect we have to consider of. Generally the shrinkage allowances are usually 1-2%. The pattern surfaces are never made perpendicular to the mold parting surface. The taper of the pattern surface, which provides narrowing the mold cavity towards the mold parting surface is called draft. The draft can allow us have a easy removal of the pattern and the casting from the sand mold. The draft angle is commonly adopt 1-3%.

So after the sand casting pattern we prepared well, the design of the sand casting can form a through way to sand mold. The sand cores we made can guarantee this process. The passage ways in sand mold casting are formed by the cores which are placed very well. We pour the metal into the mold cavity until the metal solidify. So the sand casting pattern we adopted in sand mold casting can affect the whole casting process.


Sand mold casting used in foundry industry

sand mold casting is a good method used in foundry industry involving pouring a molten metal into a sand mold.

Sand mold casting use sand casting mold. There are many types of sand mold used for sand casting. Different patterns of sand mold can make different type product in sand mold casting industry.

foundry productsWith sand mold casting way, you can adopt Low cost of mold materials and low cost of equipment. In foundry industry, by using sand mold casting method, big casting dimensions products can be made very easily. Also many kinds of metals and alloys like ferrous and non-ferrous metals and alloys became possible to be cast. Some high melting point metals and alloys also may be cast easily using sand mold casting way.

We have to mention that using sand mold casting, the product with rough surface and poor dimensional accuracy is common thing. Also if we use sand mold casting, there are high machining tolerances we have to face. We also can meet coarse grain structure using the sand mold casting. Also by sand mold casting, the wall thickness is limited with not higher than 2.5-5 mm.

The sand mold casting helps foundry industry develop fast and make creating big capacity foundry products possible.