Technological Evolution Of Electromagnetic Chucks

Electromagnetic chucks were initially developed as a replacement for clamps and bolts to secure workpieces on grinding machines. These early chucks were relatively simple and primarily used to hold flat workpieces, which greatly limited their application. With the development of industry, the demand for more advanced electromagnetic tools in the industry is constantly increasing, which has driven the continuous innovation and improvement of chuck technology.


Electromagnetic chucks have a wide variety of pole arrangements. The cross-sectional shape and distribution of the magnetic core varies from workpiece to workpiece. Common types of construction include rectangular and circular. Rectangular poles can be arranged longitudinally or transversely, with the longitudinal arrangement being suitable for holding larger workpieces and the transverse arrangement being more suitable for holding smaller workpieces.  .

Performance improvement has been a key breakthrough area in recent years. Conventional electromagnetic chucks suffer from the defects of uniform distribution of magnetic lines of force on the surface, non-concentration of magnetic force, and low magnetic field strength per unit area. At the same time, the direction of the magnetic force is perpendicular to the surface of the suction cup and is difficult to change. Only one magnetic force can be generated for the workpiece with the same suction area. These problems cause the problem such as low positioning accuracy, weak clamping force, narrow application range and low production efficiency during processing.


To solve these problems, a new generation of electrically controlled powerful suction cups has emerged, whose features include:

1) It has an extremely strong holding force, up to 16kg/cm², and the magnetic force distribution is uniform and adjustable. The holding force does not need to be maintained by connecting to a power supply. Continuous operation does not generate heat, avoiding the deformation of the workpiece due to heat.
2) It can work continuously for more than 20 hours every day and requires almost no maintenance.
3) It has an automatic auxiliary positioning function, and it only takes 0.3 seconds to clamp or release the workpiece.
4) In contrast, the magnetic force of a common electromagnetic chuck requires a continuous current supply. After working for a period of time, it generates heat, which not only causes the workpiece to deform due to heat but also reduces the magnetic force of the chuck, making it impossible to ensure processing accuracy.

Besides, ordinary electromagnetic chucks can only work for a few hours each day, the equipment is easy meet problems so it need to replacement and maintenance of internal components frequently.