The Effection Research Of Fine Powdered Particulate In Moulding Sands For Engine Parts

In foundries, metal is poured into moulds which are fabricated from specialmixes of sand and special-purpose bond/adhesive compositions. This inventionaddresses apparatus and methods for making, using and recycling the sand mix. Theinvention specifically addresses use of particulate powder materials which remain inparticulate form when mixed with water.The article,first, introduce the form of the sand moulds,that is mixed withwater,and with the bond materials, the bond materials is a finely-powdered mixture ofe.g. bentonite clay, coal,and a combination of compatibilizers, stabilizers, wettingagents and the like.Bentonite, coal and other additive such as starch is a fine powdered particulatematerials, these particulate material is in general small than200mesh （＜0.074mm）,and is typically added to the mullor in dry form, and thus is susceptible tobecoming airborne until such time as the respective particles become wetted withwater. In principle,it is desirable that the mullor uniformly disperse the fresh sand andfresh sand bond material,and that substantially all bond particles and all sandparticles become wetted by the time they leave the mullor. These powders are whatrole and characteristics, in the second chapter of this paper made a detailedintroduction.When we understand the powder characteristics, these materials are needed todetect the content by the test apparatus and according to the practical situation in thefactory setting them ratio in the sand, once maladjusted, casting will cause variousdefects, so sand indicators must be controlled within a reasonable range inside, it canensure the quality of castings.This paper devotes considerable space introduced the influence of equipment tosand moulds quality, illustrated in sand production line,the equipment played acrucial role, various equipment has its advantages and disadvantages, so it is needdesign personnel to select the equipment according to their respective plant features,to avoid the wrong choice that cause irreparable loss. The article introduced the our company sand system and management methods,eventually either the equipment or process parameters, all need human intervention.Only personnel quality rise ceaselessly, final， makes Chinese casting enterprises getpromoted.