What Is a Magnetic Chuck?

The electromagnetic chuck is based on the principle of magnetism. By energizing the internal coil, magnetic force is generated. After passing through the magnetically permeable panel, the workpiece that is in contact with the surface of the panel is sucked tightly. When the coil is powered off, the magnetic force disappears to achieve demagnetization. And a machine accessory product.

An electromagnetic chuck is a kind of electromagnetic fixture, which fixes the workpiece by the suction force generated by the chuck body after the electromagnetic coil is energized. The electromagnetic chuck is composed of an iron core, a coil, a panel and a bracket. The electromagnet composed of the coil and the iron core is the main part of the electromagnetic chuck. Electromagnetic chucks are different due to differences in design methods or materials used, and they are constantly being developed and improved. The electromagnetic chuck was originally used to replace the workpiece to be ground on the grinding machine with clamps and bolts. Such an electromagnetic chuck is relatively simple and can only fix flat-type workpieces. This is the traditional electromagnetic chuck, and its application has great limitations. With the development of industry, the demand of enterprises for electromagnetic tools is increasing, and the requirements put forward are getting higher and higher, prompting people to make a series of improvements to electromagnetic chucks so that they can meet the needs of production. ^[1]

The cross-sectional shape of the pole core and its distribution vary depending on the workpiece. The structure types of common electromagnetic chucks are rectangular, circular, etc. Rectangular magnetic poles are divided into vertical and horizontal arrangement. Rectangular magnetic poles are arranged longitudinally, which is suitable for fixing large processing workpieces; Rectangular magnetic poles are arranged laterally, which is suitable for fixing small processing workpieces. Round suction cups are suitable for fixing ring-shaped workpieces or more complex workpieces. The main characteristics of ordinary electromagnetic chucks are: the magnetic lines of force are evenly distributed on the surface of the disk, the electromagnetic force cannot be concentrated, and the magnetic force is relatively small per unit area; the direction of the magnetic force is perpendicular to the surface of the chuck, which is difficult to change. This kind of magnetic force; the point of action of magnetic force on the workpiece is limited to the contact surface between the workpiece and the suction cup, and cannot be changed at will. Therefore, during processing, there are disadvantages such as low positioning accuracy, small clamping force, narrow range of use, and low production efficiency. ^[2]

The electromagnetic chuck consists of a bottom case,

There are lifting screw holes on both sides of the rectangular electromagnetic chuck. It can be hoisted by screwing in T-shaped screws during installation. Fix it on the workbench with T-shaped blocks and screws. Connect the DC power supply and ground wire on the machine tool. Refine once to ensure the parallelism of the upper plane to the lower plane. When attaching a workpiece, as long as two adjacent magnetic poles are overlapped, sufficient positioning suction force can be obtained and grinding can be performed. Through the machine button, the magnetic flux and

1. Ordinary rectangular electro magnetic disk use: rectangular table

Magnetic suction cup suction cup suction

The electronically controlled powerful suction cup has a very strong holding force, up to 16kg / cm². The magnetic force is evenly distributed and adjustable. It can be used for various powerful machining, roughing, and finishing. The ordinary strong suction cups have weak suction and uneven distribution. Unable to withstand the demands of heavy machining operations.

Processing accuracy of electromagnetic chuck

The electronically controlled strong chuck holding force does not need to be maintained by connecting the power supply. It does not generate heat during continuous operation and avoids thermal deformation of the workpiece. At the same time, the strong and uniform disk surface suction force ensures the highest machining accuracy even if the workpiece exceeds the table surface; A continuous supply of current is required, and heat is generated for a period of time during operation. Not only the workpiece is deformed due to heat, but also the magnetic force of the suction cup is reduced, and the machining accuracy cannot be guaranteed.

Performance of electromagnetic chuck

The electronically controlled powerful suction cup can be used continuously, even if it works continuously for more than 20 hours a day, there will be no failure, and no maintenance is required; ordinary suction cup permanent magnets will have a decrease in suction when they are used for about half a year. The electromagnetic chuck can only work for several hours a day, and the equipment is prone to work, and internal components need to be replaced and repaired frequently.

Working efficiency of electromagnetic chuck

The use of ordinary powerful suction cups requires a lot of workpiece adjustment time, which can account for 40% -50% of the entire processing process, and the positioning of the clamping is prone to obvious errors, high reject rates, and very low efficiency; the electronically controlled powerful suction cups have automatic auxiliary positioning Function, simply press a button, complete the clamping or release of the workpiece in 0.3 seconds, which can greatly improve production efficiency.