Application of the accessories can increase the practical value of a vacuum chamber. For example, the heating cup allows the production of wax models for the metal investment casting.
If the user is not sure if the accessories are needed or not, they should at least order the electrical preparation. It is not expensive and allows for an easy and fast refitting.
Differential Pressure
The advantages of the differential pressure system
If required, MK equips all chambers from System 1 upwards with the so-called Differential Pressure System. Compared to pure gravity casting, this process has the following advantages:
Even very sophisticated, complex, very long and thin moulds can be filled perfectly.
High-viscosity resins as well as fibre-filled resins can be processed without problems.
Resins with a very short pot life (up to 2 min.) can be easily cast, reducing the time for finishing.
Maximum pressure difference: 100 mbar
Development of the pressure difference: 10 – 60 sec.
Neutralisation of the pressure difference: < 1 sec.
Filling time compared to gravitation casting: 1/3
If a vacuum machine is equipped with the differential pressure system, the upper chamber containing the casting and mixing unit is separated from the lower mould chamber by a steel rib. The casting funnel passes through this rib.
When the differential pressure system is switched on the upper chamber is flooded to a pre-selected differential pressure up to 100 mbar. As there is still almost a complete vacuum in the lower chamber, the resin is pressed into the mould, accelerated by the differential pressure system.
The practical value of the vacuum chamber can be increased tremendously by applying the heating cup. Now wax patterns can also be made using the same technology and the same silicone moulds. While the investment casting industry continues to grow, there is an ever increasing demand for quality wax patterns.
Several moulds can be filled during one evacuation process by using the turning table. The appropriate quantity of resin is poured into the funnel and down into the mould.
Afterwards the next mould is positioned below the funnel by pressing the button. This process is especially appropriate for resins with a long pot life. The turning table can also be mounted subsequently in quickly if the machine has been ordered with the necessary preparation. In combination with the mould lift the whole unit is also height adjustable.
To achieve the optimal casting result, the silicone mould has to be tempered before and after casting in an oven. We recommend the application of the roller conveyor for the transport of medium-sized and large moulds, as weight can be up to several hundred kilos. For safe transport the roller conveyor is equipped with a brake.
