A Brief Discussion About Low Pressure and Gravity Die Casting

To produce casting parts from non-ferrous materials, gravity die casting is used. To create intricately shaped components, the process is used in many industrial applications in various sectors. Under the force of gravity, it involves pouring molten metal into a pre-formed cast iron block which to produce the die is fully machined.

In this article, we take a look at the benefits and the process of this technique.

Gravity die casting incorporates four major steps. First and foremost, before clamping them together with a coating, the two die halves are sprayed and heated soon.

This lubrication also aids the removal of the casting and helps to prevent premature solidification.

Into the cavity of the die, the molten metal is then poured. Before it is allowed to cool, the metal solidifies at a rapid rate. Finally, the cast parts are removed after removing the die.  

On the precise temperature control of the mold, the quality of aluminum parts produced in die casting processes largely depends. However, on the speed and efficiency of the casting process, cooling also has a decisive impact. Through customized and optimized cooling line control, you can maximize product quality and minimize scrap rates.

For die-casting foundries, the automotive sector remains to be the most essential sales market. Suppliers to remain competitive in this sector must produce die-cast parts of consistently high quality. In the manufacture of aluminum transmission housings, rims, chassis parts, cylinder blocks, and pistons, two casting processes are used primarily. Both from precise cooling benefit a lot: the gravity die casting process and Low-pressure casting. Cooling in both casting processes is an essential step. On the implementation of accurate temperature control, their success largely depends.

The surface of each die or metal mold component in gravity and low pressure die casting is provided with a die coating or mold, which is contacted by molten metal. At a thickness of from about 0.05 to 1.0mm, a ceramic-based coating is used under current procedures. Providing a degree of insulation is the main function of the coating which is intended to prevent premature molten metal solidification and thereby before solidification starts, enable the complete filling of the die cavity. However, from corrosion or erosion, the coating also is to protect the steel die surfaces by contact with the molten metal or the impingement.

The use of a water-based suspension of ceramic particles containing a water-based binder in Current die coating technology is popular, most commonly sodium silicate. While tedious procedures are involved in testing and stirring to prepare them for use, Coating mixtures of this type need to be stored properly. To the shot or sandblasted surface of a die component, the coating is applied using a pressurized air spray gun. Typically from about 150 to 220°C, the component is preheated for this, such that from the die surface, water is evaporated enabling the binder to bond to the die surface and the ceramic particles together as well as polymerize. The gravity die casting is very popular.

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Created on May 8th 2021 02:45. Viewed 247 times.

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