| Learn about the basics of Brass Casting, types of | | | | the solidification and cooling of brass, the |
| Brass Casting, and the process of Brass Casting. | | | | separation of casting from sand mold takes place. |
| Brass casting, as the name suggests, involves the | | | | Normally, such molds are one-time usable. |
| use of brass as the molten metal. Brass casting | | | | Patterns: A designer or an engineer provides the |
| can be carried out by the way of sand casting | | | | design of the object to be produced. On the basis |
| only. Sand casting can be defined as a cast | | | | of this design, a pattern is built by an efficient |
| part’ produced by formation of a mold | | | | pattern maker by the use of plastic, metal, or |
| from a mixture of sand and pouring the casting | | | | wood. Polystyrene can also be used. The casting |
| liquid (mostly molten metal) into mold. Then the | | | | brass would get contracted during solidification. |
| air-cooling of the mold takes place. After the | | | | Non-uniformity can also result out of this. |
| solidification of metal, the removal of mold takes | | | | Therefore, the size of the pattern should be a bit |
| place. The metal used here is brass. It is a known | | | | larger as compared to the final product. |
| fact that brass is an alloy of copper and zinc. | | | | Contraction Allowance’ is the name |
| Hence, to be precise, the molten metal consists | | | | given to this difference. Brass enters the mold |
| of two elements. Sand molding consists of two | | | | cavity through a runner system including sprue |
| types- Green sand’ molding and air | | | | and other feeders. |
| set’ molding. The first one consists of a | | | | Molding box: A molding box having multiple parts |
| blend of moisture, clay, silica sand and other | | | | (also known as casting flask whose bottom and |
| additives. The second one makes use of dry sand | | | | top halves are called drag and cope respectively) |
| bonded to all the above materials except moist | | | | is constructed for receiving the pattern. There |
| clay, by the way of using an adhesive, which is | | | | may be an addition of sand to nullify the defects |
| fast curing. | | | | introduced due to the pattern getting removed. |
| At times, there is a placing of a temporary plug | | | | Chills: To have a proper control over metallurgical |
| (in the mold cavity) to enable the formation of a | | | | structure and solidification of brass, plates of |
| channel to pour the fluid which is to be molded. | | | | brass, or any other metal can be placed in mold. |
| The molds of the second type, i.e. the air-set | | | | A hard structure may get formed at these |
| molds result in the formation of a 2-part mold. | | | | places. Chills can be used for promoting directional |
| The two parts are bottom and top. The | | | | solidification as well.Design Requirements: The thing |
| tamping-down of the sand mixture takes place as | | | | in making and the pattern corresponding to it |
| it gets added. Many a times, the final assembly of | | | | should be designed in such a way that every |
| the mold is vibrated to get the sand compacted | | | | stage of process can get accommodated. One |
| and get the unwanted voids filled. Then the | | | | should be able to take away the pattern without |
| molten alloy (brass) gets poured into mold. After | | | | causing any disturbance to molding sand. |