Metal Die Casting Company
Copper alloys have the enormous advantage of being used immediately after casting, particularly when resistant to tensile or compressive stresses. The same applies to resistance to contact wear (bearings, bushings, gears) and when cold workability is required by Metal Die Casting Company. Sand casting is one of the most versatile techniques since it allows a great variety of dimensions, design and quality of the products together with a good economy in the production of modest quantities of medium-low quality pieces. To the disadvantage of the method there is the impossibility of using it for high precision casting due to the impossibility of the sand to perfectly follow a complex mold and for the inevitable dimensional variations that occur when it is removed. Casting in plaster is a technique used for non-ferrous alloys that require great dimensional accuracy, smooth surfaces and details difficult to obtain with other more common methods such as sand casting. It is exploited when the mechanical processing of the piece is complex (for example fans or network molds). Often plaster casting is used in combination with other techniques only in parts areas where high final quality is required. The disadvantages are related to the cost of the material, necessary in large quantities and not reusable, and to the poor permeability of the plaster that requires the use of large pressures to be exerted during the process. Casting in coating: in this type of casting a ceramic residue is used compacted on other material, like wax, in order to obtain a mold with good mechanical characteristics. Of this type of process there are two distinct modes: a solid coating and a ceramic shell. The first type is now almost unused, except for some special applications such as dental prostheses and jewelry molds, while the latter is widely used in aeronautics for super-alloy casting for turbine blades. The advantages of this type of casting are many and lie in the great accuracy of the details and dimensional accuracy obtainable in the piece with consequent reduction in the need for subsequent machining and in the possibility of application on a large variety of alloys, including those with problems in other types of processes. In the last fifty years the ceramic shell casting has become so widespread as to become the most widely used technique in precision casting. The great versatility of the production process allows the use of different techniques and various materials to obtain the desired characteristics in the final metal product. Die-casting: metal die cast technique used for many years in the casting of copper alloys has then fallen into disuse to be rediscovered in recent times as a precision technique.
