Casting is a kind of old manufacturing method,can be traced back to 6000 years ago in China.Since today for casting,precision casting,casting quality cost and the improvement of casting automation,etc,casting technology to motors,large-scale,high quality,the direction of automation and clean,for example,in recently years,in the precision castings,continuous casting,special casting technology,automation and foundry casting forming simulation technology has been developing rapidly.
Casting processes mainly include:metal melting, model manufacturing,clean casting solidification and stripping, etc.Casting method is commonly used sand mold casting,followed by special casting method, such as:metal mold casting,investment casting,plaster mold casting and so on.Sand mold and sand mold casting can be divided into clay,and organic binder sand mold,resin self-hardening sand mold,mold and so on.The principle of casting method choice:
1.Preferred sand mold casting according to the statistics in all casting production,60 to 70% of the casting is made of sand mold production,and 70% of them are using clay sand mold production.Mainly because of sand mold casting as compared with other casting method is low cost,simple production process, short production cycle.So like a car engine cylinder block,cylinder head,crankshaft,etc.are of clay green sand casting process.When wet can't meet the requirements to consider using clay sand table dry sand,dry sand mold or other mold.
2.Casting methods should be appropriate to such as sand casting production batch and mass production in the factories should create conditions for the modeling of advanced technology,core making method.Old jar type or shock squeeze molding machine production line productivity is not high,workers labor intensity big, noise big,does not meet the requirements of mass production and should be modified step by step.
3.Modeling method should be suitable for factory conditions such as also is the production of large machine tool lathe bed casting, general assembling modeling method,don't make shape and sand box, core in the pit;While other factories using sand box molding,production.Different enterprise production conditions (including equipment,venue,staff quality, etc.),production habits,experience different,should consider what suits to do based on this product and is not suitable for (or not) to do the product.
4 Should take into account the precision casting requirements and the cost of all kinds of casting method for precision castings,investment and productivity are not consistent at the beginning of the final economic efficiency also have differences. Therefore,to do more, faster,better, province, all aspects should give attention to two or more things arrives.Selected for dealing with the casting method carries on the preliminary cost estimates,to determine the economic benefit is high and can ensure that castings foundry method.
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