In this article we will discuss about the process and characteristics of sand casting. Process of Sand Casting: The importance of sand casting is increasing day-by-day as the scientific research has brought about lot of applications and adaptations in the field of casting industry. This is probably the easiest and most convenient way of giving the desired shape to the [...]
In this article we will discuss about:- 1. Meaning of Permanent Mould Casting or Gravity Die Casting 2. Characteristics of Permanent Mould Casting 3. Limitations. Meaning of Permanent Mould Casting or Gravity Die Casting: Like sand casting, this method also consists of pouring molten metal but in a metallic mould without external pressure. Moulds are generally made of cast iron [...]
The following points highlight the top eleven methods adopted for casting of metals in an industry. The methods are: 1. Semi-Permanent Mould Casting 2. Slush Casting 3. Pressed Casting 4. Squeeze Casting 5. Centrifugal Casting 6. Investment of Lost-Wax Casting 7. Frozen-Mercury Moulding (Mercast Process) 8. Plaster Mould Casting 9. Antioch Casting 10. Continuous Casting 11. Chill Casting. Method # [...]
In this article we will discuss about:- 1. Meaning of Die Casting 2. Die Casting Machines 3. Advantages 4. Limitations. Meaning of Die Casting: Die casting utilises two blocks of heat resistant metal machined to meet along the plane of the parting line and having cavities machined accurately and smoothly into each to form opposite halves of the shape to [...]
The use of ribs, hubs and bosses should be made in such a way that the weight is reduced, the part is strengthened and the general appearance is improved. Thick sections tend to cause the die to run hotter and, therefore, shorten die life. In addition, cooling of a large lump may cause porosity and give trouble if drilling is [...]
The die is most important part in die casting machine which will be discussed here in detail. Dies for all the machines are similar in construction as there is little difference in the method of holding and operating them. Generally it is made into two halves so that the casting can be easily removed from it after solidification. One part [...]
In this article we will discuss about the process and moulds of centrifugal casting. Process of Centrifugal Casting: i. True Centrifugal Casting: In this process, the castings are made in a hollow, cylindrical mould rotated about an axis common to both casting and mould; the axis may be horizontal, vertical or inclined. Usually the mould is rotated in horizontal plane. [...]
Formerly this process was widely used in Europe for hardening of moulds and cores made of green sand, but now- a-days, it has been adopted in several countries because of rapid hardening of sand. It consists of thorough mixing of silica sand (clean, dry and free from clay) with 3.5 to 5% by weight of sodium silicate liquid base binder [...]
The following points highlight the process of continuous casting of metals. The processes are: 1. Reciprocating Mould Process 2. Asarco Process. 1. Reciprocating Mould Process: In this process molten metal is poured into a holding furnace. At the bottom of this holding furnace there is a needle valve arrangement by which the quantity of flow can be changed. Metal from [...]
In this article we will discuss about:- 1. Meaning of Malleable Castings 2. Classification of Malleable Castings 3. Mechanical Properties. Meaning of Malleable Castings: Malleable castings are made to the desired shape by pouring molten metal in sand mould which on solidification gives white cast iron castings. If these castings are used as they are, they will have poor strength, [...]