| What is a sand casting? How dose it comes out? | | | | the cope is separated from drag. Within the |
| The following passages would give you some | | | | mechanical methods, the sand mixture is |
| answers. | | | | assembled to for a mold cavity. According to the |
| Have you seen a large metal made of iron, | | | | different types of sand, the change happened |
| bronze, brass of aluminum with some featured | | | | during this process is different. Whatever, a riser |
| patterns in the middle? Have you noticed a cavity | | | | is needed to hold excess molten material to avoid |
| of wood or metal? If you say yes, I think you | | | | the holes in the main casting. |
| have already got the idea of casting. The sand is | | | | Next, allow the metal to cool. At this moment, |
| a cast part produced by forming a mold from a | | | | the liquids are solidified. It is time for you to break |
| sand mixture and pouring molten liquid metal into | | | | away the mold and remove the casting. It is true |
| the cavity in the mold. After the process of | | | | that the mold is destroyed in the removal |
| cooling, the melted metal has been solidified. At | | | | process. However, the pattern itself can be |
| the last, a sand casting would be gotten just | | | | reused to produce new sand molds. And if you |
| separated from the mold. Generally speaking, it is | | | | want a more elaborate casting, surfaces should |
| produced as follows. | | | | be polished. |
| The basic step is to place a pattern in sand to | | | | The producing process appears to be simple. But |
| create a mold. It should be mentioned that the | | | | it is definitely not. It is certain that each one |
| mould has two parts divided by the parting line. | | | | hopes to produce a casting with high accuracy. It |
| The cope is the upper half and the drag is the | | | | is a work which needs enough practice. During the |
| lower half. | | | | process of casting, it is advisable to reuse some |
| And as you know, there are 2 main types of | | | | of the components of the sand mixture lost in |
| sand. One is called the "green sand", and the other | | | | the thermal casting process. Whatever, the |
| is the "air set". The previous one is a mixture of | | | | material determines a lot. Generally speaking, sand |
| silica sand, and the latter one is dry sand with | | | | castings made from coarse green sand impart a |
| other material through curing adhesive. | | | | rough texture on the surface of the casting which |
| Then, remove the pattern and pour the melted | | | | makes them easy to identify. However, air-set |
| metal to the mold. You can use the vibration and | | | | molds can produce castings with much smoother |
| mechanical method to remove the pattern. And | | | | surfaces. |