How to know investment casting process clearly

The investment casting process is also called 'lost wax casting’; it is perfect to help our customers in investment casting to be able to make superior purchasing decisions. It contains several processes as following. Due to the importance of low wax casting, it is necessary for you to get familiar with it.

Wax Injection:

The first thing about lost wax casting you should know is wax Injection. Imitation of the preferred investment casting is created by injection molding or for lesser volumes using speedy prototyping (SLA or SLS). These mock-ups are referred to as patterns.

Assembly of Wax Tree:

Patterns are then fastened to a central wax stick, called a sprue, to form a casting. This is known as wax tree.

Ceramic Shell Building:

The shell is made by submerging the wax tree meeting in liquid ceramic slurry and then into a bed of fluidized fine sands. Up to eight coatings are applied in this way depending on the shape and weight of the part.

Dewax:

Formerly the ceramic is dry; the wax is then liquefied out, making a negative impression of the meeting within the ceramic and sand shell. This process utilizes autoclaves to uphold shell reliability.

Conventional Casting:

In the conventional lost wax casting procedure, the pre-heated shell (up to 1800 deg F) is poured with molten metal by gravity filling the metal into the ceramic shell. As the metal cools, gates, sprue, the parts, and filling cup become one solid casting. Shell temperature and dissolving temperature will differ depending on the alloy.

Knockout:

Once the metal is cooled and hard, the ceramic shell is wrecked off by tremor or water blasting.

Cut Off Of Parts:

The parts are then cut away from the central sprue utilizing an elevated speed saw.

Finished Metal Investment Casting:

Following minor finishing operations, or potential needed machining functions, the metal investment castings-identical to the innovative wax patterns--are prepared for shipment to the customer from our metal lost wax casting China foundry. We are able to offer finished cobalt alloy investment casting, steel investment casting, aluminum investment casting, stainless steel investment casting, nickel alloy lost wax casting and precision lost wax casting.

Wall Thickness:

Please call for tolerance stipulation for wall thickness or any tolerances in common. As per the metal or alloy, least amount of wall thickness can vary from 0.04 inches to 0.08 inches.

A coin has two sides, and this is also applied to the lost wax casting. The investment casting has pros and cons just like I list in the following:

The advantages of the investment casting:

No flash or parting lines

Almost any metal can be cast.

Ready for use with little or no machining required.

Very close tolerances and excellence surface finish can be obtained.

Complex shapes which are complicated by any other technique are possible.

Suitable for producing complex shapes where other production processes are too expensive and time-consuming.

Expensive as many labor engaged in the preparation of the wax patterns & shell moulds.

Disadvantages of the investment casting:

Occasional minute flaws.

The size of the casting is often limited.

Time consuming as shell moulds cannot be reused.

Expensive as many labor engaged in the preparation of the wax patterns & shell moulds.

Ningbo OEM strictly keep the process of investment casting, and can offering you a complete choice of different casting products which include stainless steel casting.