Electro-permanent magnetic chuck Magnaslot 75

The patented EPM magnetic chucks (patent no. EP1874504) have a solid steel surface and are therefore significantly more resistant to hot chips, coolant and other machining influences than conventional chucks with epoxy resin. The workpiece is clamped on the Magnaslot within seconds by a current pulse. The chuck allows 5-sided machining of workpieces in a single clamping, which reduces set-up times to a minimum and increases productivity. Pole extensions that adapt to the workpiece surface compensate for any unevenness and prevent the workpiece from deforming.

The magnetic field of the Magnaslot ensures low-vibration clamping of the workpieces. This protects the milling spindle and the tools, increases process reliability and extends service life. Electro-permanent magnets combine electrical and permanent magnet technology: they are permanent magnets that can be switched on and off electrically, and they do not lose their holding force even in the event of a power failure. As only a current pulse is needed for clamping, the electro-permanent square-pole technology offers the highest level of safety. The workpiece is held on the chuck by reversible permanent magnets.

In the event of a power failure or a break in the control cable, the workpiece remains clamped on the Magnaslot with full holding force. Two-button operation, both on the control unit and on the cable remote control, also rules out accidental release of the workpieces due to incorrect operation. Assfalg magnetic chucks are only supplied with the maximum number of poles on their solid steel surface, as only this guarantees maximum holding force. A plane-parallelism of 0.02 mm or better ensures high manufacturing and process precision. With a holding force of 900 kg per 75 x 75 mm square pole and the high pole density, clamping forces of nearly 19 tonnes can be achieved on a 400 x 600 mm chuck.

• Drastically reduced set-up times
• 5-sided machining with simple and fast positioning of the workpiece
• Low vibration during milling and even distribution of the holding force over the entire magnetic clamping surface
• Plane-parallelism of up to 0.01 mm on the workpiece with pole extensions
• Full use of the machine, as there are no interfering edges as with mechanical clamping
• Distortion-free holding of raw parts or uneven workpieces thanks to form-fit clamping with fixed and mobile pole extensions
• Shimming of workpieces is no longer necessary
• No damage to the magnetic chuck when machining breaks through the workpiece
• Easy adjustment of the magnetic holding force for thin workpieces or for alignment, via the holding force regulation

• Data sheet (EN) (PDF, opens in a new tab)
• Control units (EN) (PDF, opens in a new tab)
• Accessories (EN) (PDF, opens in a new tab)