PROCESS

WAX

The process begins with the injection to avoid the liquid wax under pressure in a die. Hollow parts are produced by the insertion of a ceramic coreThen the core is controlled under the X ray and position by ultrasonic.After finishing, wax patterns are assemble on a wax tree (runner).

SHELL

A ceramic mould is formed around the wax assembly.

The shell is formed in four phases :

-           immersion in a ceramic slurry, dipping

-           draining

-           ceramic grains aspersion, stuccoing

-           drying.

Depending on the pieces, the operation is repeated many times.                       Then, the mould is produced by dewaxing using a steam autoclave.

FURNACE

Before the casting, the shell is prepared : it is put in a furnace to dry it and clean it from all wax residue.

The liquid metal is poured in the mould to produce the casting.

EMA is using two types of furnaces :

-           automatic furnaces, approved for the Single Crystal and Directional Solidification parts production, for the parts till 10kg

-           automatic furnaces approved for the Equiaxed parts production but also for the Single Crystal parts, till 70kg.

POST CAST

The shell is removed and the part is cleaned.                                                            The alimentation bars are cut.                                                                                      The part is blasted and grinded. Eventual thermic treatments are made, like chemical treatments to remove the internal core.

The part is washed, dried and degreased.

CONTROLS

-           EMA is approved for :

-           - grain size control

-           FPI fluorescent

-           X-Ray

-           Boundary angle measurement (Scorpio)

-           Dimensional using gauge and CMM.