The lost-wax casting induces the principle of reproduction of an original part by molding process. This molding, generally made of elastomer material, allows to flow or inject hot wax, which consequently takes, after cooling, the form of the original part that was molded.
This step is very important for obtaining a perfectly cast iron as the original part (the model is generally provided by the customer).
The molding department therefore incorporates a highly experienced and qualified staff, with great expertise in the preparation and cutting of molds and having the best quality of molding materials and the most advanced equipment in the market.
Creating a mold
The realization of a molding is first of all a good preparation of the center part. A feed rod is attached to your part. The whole is then introduced into a form, which will be adapted to the size of the part.
To create the silicone mold, the molders must first prepare the silicone liquid form. To do this, they mix under vacuum a base and a catalyst. The liquid is degassed in order to extract all air bubbles which can be found in the mixture. The silicone is then poured accurately in each form, then it is again passed to the vacuum degassing in order to remove the last air bubbles and to ensure that 100% of the part is covered by the silicone.
The forms are put in catalysis zone for several hours so that the mixture completely hardens.
Molders then proceed to the opening of the mould using scalpels and hooks of different sizes and shapes in order to get a clean cut. Once the mould is open, the center part is removed, leaving her perfect imprint in the silicone mould. This is tested and if necessary corrected to be fully qualified for production use in the wax workshop.
Solyfonte features a full range of wax-up equipment to achieve any kind of parts of different size, with different and often high technical levels.
Thus, the wax workshop has a complete range of machines
- The wax programmable vacuum machines with precise control of injection power: before injecting wax, the injector carries out a slight under pressure in the mold to remove air. He then injects the wax under pressure, so that the mold is completely filled. The operators have the ability to easily change the settings of vacuum and pressure in order to adjust at best their needs based on the types of part that needs to be achieved.
- Vertical vacuum molding housing for making hollow parts. Indeed, some parts have to be hollow, including large parts, so it is necessary for the operators to create wax shells hollowed perfectly. To do this, they have cabins to sink a wax specially developed for this process. They completely fill the mold and then after a predetermined time lapse on the basis of the room, the wax is drained from the mold, leaving only a thin layer which has dried, once in contact with the silicone. It is this shell of wax that will allow eventually to achieve a casting, perfectly done (for the statues, vases, etc…).
- Complete equipment of editing and correction of gross waxes (the trades of the medical, dental material, industry, etc…). Operators check each injected or molded wax in order to detect any deficiencies (joint plan micro, small burrs) and is using each one of tools dedicated to each operation of editing and preparation.