Research and development in gravity casting has taken an important step in making metal products a part of our day to day lives. Theproducts used in homes, aircrafts, artifacts, automobiles have become more durable and less expensive. Cast alloy parts are formed by melting the alloyand then pouring it in a mold under heavy pressure or vacuum. Gravity casting is also known as vacuum casting. It is a technique in which large diameterfilaments are used with adequate separation. This ensures that no clusters are formed and also good metal wetting of the fiber is guaranteed. This techniquewas first used in 1970. The gravity casting method has advantages like costeffective, good quality, and process control over other casting techniques. Gravity casting is done in ceramic molds, sand, permanent casting and also in investment or lost wax casting. The gravity casting processwas started with common steel after successful implementation it was furthertried on heat resistance super alloys. With recent development and with morerefined methods today even titanium alloys are being cast using the gravitycasting method and using ceramic crucibles.
The use of desired mold designs andalso specially made unique designs enable a reduction in the metal cast toyield the given part. This also helps in reducing the amount of energy that isused in making such casting articles. With new developments, today even computerized control ofthe vacuum pressure and rate is possible. This enables the user to control thefilling rate. This makes casting of high quality metals like and viscous metalslike metal matrix and composites of aluminum casting possible. This gravitycasting method is used to produce casting worth of more than $200 million. Theindustry is expected to grow rapidly in the coming years due to the increase inproduction of automotive exhaust manifolds in stainless steel. The first ever commercial use of this computerizedtechnology, was made by Howmet Industries of Whitehall, Michigan.
They used this technology to precisely cast and design turbine blades used in aircrafts.This technology is also being used by Ford Motors to develop and improve thecasting process of light truck and automobile engine blocks. Today, metal parts fabricated using gravity casting methodis being used in 90 per cent of all durable goods. Goods like stoves, washingmachine, automobiles, refrigerators, lawn mowers, cars and even boats. Manyother articles like badminton rackets, tennis rackets, and even football studs are made by using light weight metals which are gravity casting method.
This gravity casting method has been Free Assembly Adjustable Shelves used to develop metal alloy parts, which areused for the auto and airline industries, which is said to make vehicleslighter though much stronger and extremely efficient. Alloys like ferric cast metals, casting grade iron and steelare typical metals that are used for gravity casting. Also die cast grade zinccan be cast using gravity casting method. Also other raw materials like sand, spinor plaster are used. Aluminum is also used, but it is very difficult to gravitycast aluminum a lot of care needs to be taken and proper pressure should beapplied to obtain the desired shape and effect.