Holding magnets Special holding systems
Tridelta will be happy to manufacture your very specific solution.
Flat gripper made of hard ferrite
Due to the low-cost hard ferrite, flat grippers are particularly economical. Hard ferrite flat grippers can be used – even for longer periods – at temperatures of up to +180°C without any change in the microstructure of the magnetic material. This heating can cause a loss of adhesion of 30 to 40%. However, this is reversible and there is no permanent progressive reduction of the adhesive force. Magnet systems!
A ceramic permanent magnet material is used for the hard ferrite flat gripper. A pot made of soft iron provides the desired magnetic shielding. Thanks to its low height, the flat gripper often offers design advantages. It can be fastened by either press-fitting, gluing in or screwing in.
Rod and flat grippers made of samarium cobalt or neodymium
Samarium-cobalt and neodymium-iron-boron are rare earth alloys with cobalt or iron.
Their advantage over other materials is that they increase the holding force by a factor of three to five for the same size.
Samarium-cobalt and neodymium-iron-boron flat grippers offer very high holding power. They can also be used for long periods at temperatures of up to 220°C (neodymium up to 100°C) without any change in the microstructure of the magnetic material. When heated to this temperature, a loss of adhesion of 15 to 20% may occur. However, this is reversible and there is no permanent progressive reduction of the adhesive force.
Compared to hard ferrite and AlNiCo grippers, the high holding forces allow reduced sizes with the same holding force. This saves installation space and the associated material costs. These grippers can be fastened by pressing them in, gluing them in or screwing them in.
Samarium-cobalt and neodymium bar magnets must never be pressed directly into iron, otherwise magnetic short-circuits will cause loss of holding force. Therefore, it is essential to take into account the distance of an iron wall from the bottom and the outer perimeter according to the table.
Rod gripper made of AlNiCo
AlNiCo bar grippers are suitable for applications in which the magnetic field should be largely independent of temperature. They can be used permanently at temperatures up to 450°C without any change in the microstructure of the magnetic material. When heated to this temperature, a loss of adhesion of 30 to 40% may occur. However, this is reversible and there is no permanent progressive reduction of the adhesive force. Magnet systems!
The AlNiCo rod grippers have a high holding force. They are made of the AlNiCo permanent magnet material AlNiCo 36/5. A pot of soft iron interposed with a sleeve of non-magnetizable material provides the desired magnetic shielding.
The bar gripper can be fastened by pressing in, shrinking in, soldering in (soft solder), riveting in the spigot or screwing in after attaching a thread.
Special bonding systems made of hard ferrite, samarium cobalt and neodymium iron boron
Tridelta Magnetsysteme specializes in the construction of custom-made holding magnet systems such as holding systems with neodymium magnets for extremely harsh environmental conditions. For this purpose, a complete encapsulation of the magnetic material in magnetic stainless steel and/or brass is made in these systems.
Tridelta’s repertoire also includes bonding systems for high-vacuum applications that are manufactured without the use of plastics or outgassing adhesives.
In the case of special requirements for an adhesive system, Tridelta’s technicians develop optimal, individual solutions, both in small quantities and as high-volume systems. The magnet systems can be bonded, flanged, welded, or even injected with plastic or zinc die-cast. Depending on the required holding force and operating temperature, Tridelta uses the optimum and most cost-effective material for your application.
Plate lifter
The metal pickup can be used to easily tighten magnetic metal parts such as sheet metal, metal chips, screws. Sheets can be easily lifted and set down again. Due to the special magnetic system, it is irrelevant whether there are other magnetically adhering parts under the sheet.
The manual de-stacker pulls the sheets one by one. It has been developed primarily for the removal of sheet metal, but lost screws can also be found quickly with its help.
Manual destacker Greifix with and without belt
The Greifix manual de-stacker pulls sheets individually and loosens them effortlessly. It is suitable for sheets with thickness up to 2mm. It can be operated by both right- and left-handed users. The Greifix is slipped over the work glove. To lift the sheets from the stack, the hand with the system is placed flat on a corner of the sheet. This is attracted by the magnet and can be easily lifted off or pushed over the edge of the stack. A bending hand movement releases the Greifix effortlessly from the sheet.
The holding force that a magnet system exerts on a steel sheet depends on its shape and size as well as on the thickness of the sheet to be attracted. If the thickness of the sheet is too low, lines of force will emerge which may attract other sheets in a stack. To ensure that only one sheet is lifted from the stack at a time, the Greifix manual destackers of the 105690 and 131000 series feature multi-pole pitch with close pole spacing. With a total holding force of 200N at vertical tear-off, you can optimally air sheets up to 2mm.