construction industry

3D Wax - Mould system for precast concrete elements
Patent / license sale

Large precast concrete slabs such as ceiling and wall slabs, as well as balconies are nowadays produced on long production tables or pallet-shaped tables.

For some years now, there have been ideas of making moulds in wax or sand, filling the formwork tables with either material and then milling the moulds with a 6- or 7-axis milling machine.

Although this process is theoretically conceivable, it requires an extremely long processing time, because approximately 80-90% of the volume have to be removed.

Only the external volumes of the precast concrete parts are introduced in the form of oversized wax formwork. The defined contours of the precast concrete parts are smaller than the original ones. Therefore it allows the edge surfaces of the mould to be milled too.

The an important next step the wax will be prepared for the digital process.

Robots in precast concrete production
Concrete mould milling

The milling robot is now used according to CAD data of the parts that need to be produced. The surfaces and contours of the shape that match the external shape of the plate are now milled. The material removal is 7 to 10 times less than if the mould had to be milled from a fullwax block.

After completion of the mould by the milling robot, the required reinforcement is inserted into the mould. Afterwards the mould can be poured with concrete.

The mould moves into the curing chamber or is inductively heated. That leads to temperatures of up to 50° C. Hardening takes between 5 and 10 hours, depending on the concrete used.

After the concrete has hardened the mould heats up to over 70°. The wax melts and flows off from the fromwork table via the openings provided, is collected and 100% recycled for further use.

The finished concrete slab can be lifted by crane at the lifting eyes.The table or the pallets are cleaned and a new production cycle can begin.

Patentverwertung - Bauindustrie | 2. Teil

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