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Home | Success Stories | Future-oriented metal recycling: De Rooy relies on WEIMA solutions for briquetting and dewatering

Future-oriented metal recycling: De Rooy relies on WEIMA solutions for briquetting and dewatering

The collaboration between De Rooy, Nuenen in the Netherlands, the WEIMA partner Dormatec Environment Systems, De Goorn, and WEIMA Maschinenbau GmbH demonstrates how a circular economy can be implemented in metal processing. Together, they worked on a solution to not only transport and dispose of metal waste such as grinding sludge and aluminum chips in a space-saving and cost-effective manner, but also to convert them into valuable, reusable materials. The two WEIMA presses, C.200 and TH 1500, play a central role in De Rooy's recycling process.

De Rooy specializes in grinding, milling, and precision measuring of steel – and that in particularly large dimensions. The family business, founded in Eindhoven in 1939, now employs over 110 staff and is active in various industries. These include the offshore, semiconductor, and food industries with products such as casings, blades, bearings, and shafts that require precise processing despite their size.

De Rooy headquarters in Nuenen, Netherlands.

De Rooy headquarters in Nuenen, Netherlands.

Efficient solution for the disposal of grinding sludge

During steel processing, grinding processes generate so-called grinding sludge. This grinding sludge consists mostly of fine steel and corundum particles as well as oil (80%). Disposing of this waste is very cost intensive for De Rooy and similar companies. In search of a sustainable and more affordable solution, the collaboration between De Rooy and Dormatec Environment Systemswas established. Jos Schouten, Production Manager in the milling department at De Rooy, explains: “We wondered how we could save on transport costs and at the same time help the environment. Dormatec Environment Systems convinced us with their solution for the grinding sludge and their WEIMA machine.”

The almost dry grinding sludge is pressed out of the discharge pipe of the WEIMA C.200 press

The almost dry grinding sludge is pressed out of the C.200

The WEIMA C.200 press is located in an industrial hall

The WEIMA C.200 press

Saving 100 liters of oil per day – With the WEIMA C.200 dewatering press

The C.200 press from WEIMA contributes to efficient residual material processing by dewatering and compacting the grinding sludge. The press is characterized by a simple and robust construction. A hydraulically operated cylinder with a compaction ram compacts the grinding sludge to almost dry. The briquettes, with a diameter of 200 mm, are then ejected through a discharge pipe. The dewatered coolants, emulsions, or oils are collected in a trough and can then be reintroduced into the machining machine. In the case of De Rooy, the grinding sludge consists of up to 80% oil.

A drip tray for sanding sludge and emulsions after the sanding process

Collecting tray for sanding sludge after the sanding process

A mountain full of dry grinding sludge, partly in compressed form

Almost dry grinding sludge

"We can secure the oil and return it to our machine, which is about 100 liters a day. This way, we not only save on transport and money but also resources by recycling the oil,"

Jos Schouten, Production Manager, Milling Department, De Rooy

press: C.200

90% volume reduction in aluminum chips – With the WEIMA TH 1500 briquette press

De Rooy specializes in precision milling of machine parts in various market segments. With the largest CNC milling machine, workpieces measuring up to 14.500 x 4.600 x 2.850 mm and weighing nearly 50 tons can be processed. Depending on the machine part being manufactured, a large amount of aluminum chips is produced during milling operations. The WEIMA TH 1500 compresses these aluminum chips without binders or adhesives, reducing the volume by up to 90%.

A mountain of silver aluminium briquettes from the TH 1500

Aluminium briquettes from the TH 1500

300 liters of coolants returned to the cycle daily

In the first step, an auger conveyor transports the aluminum chips from the milling machine into the press’s hopper. The cardanically mounted screw conveyor transports a defined amount of material into the press chamber. The pressing process then occurs under pressure. The use of die technology in the TH 1500 press allows for better compaction and volume reduction compared to a press pliers. The briquetting process recovers valuable coolants, residual oils, and emulsions, which can then be reintroduced into the cooling or lubrication cycle. De Rooy returns up to 300 liters of coolants to the cycle daily. The finished briquettes are regularly picked up by a recycling company for reprocessing. There, they are melted down and processed back into recycled metal.

The chips are transported into the hopper of the TH 1500

A chip conveyor transports the chips into the hopper of a WEIMA TH 1500

"Thanks to the WEIMA press, we optimize storage. The pressed briquettes take up much less space than the loose aluminum chips. We can make internal and external transport much more efficient, and further processing is more cost-effective for us. We save resources and operate sustainably,"

Jos Schouten, Production Manager, Abteilung Fräsen, De Rooy

Press your aluminium chips now: more here:

Environmental awareness meets Industry 4.0

De Rooy has equipped the WEIMA machines with additional sensors to ensure a continuous production process. The machines are networked with each other and can communicate independently. The TH 1500 is equipped with all standard interfaces to ensure rapid integration into new or existing production lines.

In the foreground the control panel of the WEIMA TH 1500, in the background the TH 1500

TH 1500 control panel

Briquetting offers significant advantages: it reduces the volume of materials by up to 90 % and significantly lowers transport and storage costs. For this reason, De Rooy is considering purchasing an additional briquetting press from WEIMA. "Given the rapid accumulation of aluminium chips on our milling machines, we need another solution. We can take the chips to the existing press, but we want to minimise internal transport. It is also important not to mix the different coolants. A new press would further increase the efficiency of our waste management," explains Jos Schouten, Production Manager.

A pile of aluminium shavings in one hand
Aluminium chips after milling
A mountain of silver aluminium briquettes from the TH 1500
Aluminium briquettes from the TH 1500
The WEIMA TH 1500 press is located in an industrial hall
The WEIMA TH 1500 briquetting press 
The project was developed in collaboration with our partner Dormatec.

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