German rako workholding fixtures rako model rako price

rako workholding fixture is a machine tool accessory product manufactured based on the electromagnetic principle. It generates magnetic force by energizing internal coils, tightly holding workpieces in contact with the surface of a magnetically conductive panel. Demagnetization and workpiece removal are achieved by de-energizing the coils to eliminate the magnetic force. Main applications include workpiece clamping during the machining of ferrous workpieces on grinding machines, electromagnetic knife grinders, gantry milling machines, and gantry planers. Rectangular electromagnetic chucks have lifting screw holes on both sides; insert T-shaped screws for lifting during installation, and secure them to the workbench using T-shaped blocks and screws. Connect the DC power supply and ground wire from the machine tool, then precision grind the upper surface of the chuck once to ensure parallelism between the upper surface and the bottom surface. When holding workpieces, sufficient positioning holding force is obtained by bridging two adjacent magnetic poles, allowing grinding operations. Magnetization and demagnetization of the workpiece can be controlled via the machine tool buttons.

rako workholding fixture structure

The cross-sectional shape and distribution of the pole cores vary depending on the workpiece. Common structural types of electromagnetic chucks include rectangular and circular shapes. Rectangular magnetic poles are arranged either longitudinally or transversely. Longitudinal arrangement of rectangular magnetic poles is suitable for clamping larger workpieces; transverse arrangement is suitable for clamping smaller workpieces. Circular chucks are suitable for clamping ring-shaped workpieces or workpieces with complex geometries. The main characteristics of standard electromagnetic chucks are: magnetic flux lines are evenly distributed across the chuck surface, magnetic holding force cannot be concentrated, and the magnetic force per unit area is relatively low. The direction of the magnetic force is perpendicular to the chuck surface and difficult to change, producing only one type of magnetic force for workpieces with the same contact area. The point of application of the magnetic force is limited to the contact surface between the workpiece and the chuck and cannot be arbitrarily changed. Therefore, disadvantages during machining include low positioning accuracy, insufficient clamping force, narrow scope of application, and low production efficiency.

rako workholding fixture features

1) Chuck holding force: Electrically controlled powerful chucks offer superior holding force, up to 16kg/cm², with uniform and adjustable magnetic distribution, suitable for various heavy-duty machining, roughing, and finishing operations. Standard powerful chucks have weaker and uneven holding force, unable to meet the requirements of heavy-duty machining. 2) Machining accuracy: The holding force of electrically controlled powerful chucks does not require continuous power supply to maintain, generating no heat during continuous operation, thus avoiding thermal deformation of the workpiece. Meanwhile, the strong and uniform surface holding force ensures the highest machining accuracy even if the workpiece overhangs the table. In contrast, standard electromagnetic chucks require a continuous current supply, generating heat after a period of operation. This not only causes thermal deformation of the workpiece but also reduces the chuck's magnetic force, failing to guarantee machining accuracy. 3) Performance: Electrically controlled powerful chucks can be used continuously without any faults or maintenance required, even when operating continuously for more than 20 hours per day. Standard permanent magnet chucks experience a decline in holding force after about half a year of use, while electromagnetic chucks can only operate for a few hours per day. Furthermore, such equipment is prone to failures, requiring frequent replacement and maintenance of internal components. 4) Operational efficiency: Using standard powerful chucks requires significant time for workpiece adjustment, accounting for 40%-50% of the entire machining process. Clamping and positioning are prone to obvious errors, resulting in high scrap rates and very low efficiency. Electrically controlled powerful chucks feature automatic auxiliary positioning; simply pressing a button completes workpiece clamping or release in 0.3 seconds, significantly improving production efficiency.

rako workholding fixture usage

With the continuous development of China's industry, the use of electromagnetic chucks in industrial production is becoming increasingly widespread. The most important aspects of an electromagnetic chuck are its parameters, particularly the lifting capacity and its working class. The so-called lifting capacity of an electromagnetic chuck refers to the maximum weight allowed to be lifted under specified working conditions, also known as the rated lifting capacity. Generally, the lifting capacity of cranes equipped with electromagnetic chucks should include the weight of the electromagnetic chuck itself. Rectangular electromagnetic chucks have lifting screw holes on both sides; insert T-shaped screws for lifting during installation, and secure them to the workbench using T-shaped blocks and screws. Connect the DC power supply and ground wire from the machine tool, then precision grind the upper surface of the chuck once to ensure parallelism between the upper surface and the bottom surface. When holding workpieces, sufficient positioning holding force is obtained by bridging two adjacent magnetic poles, allowing grinding operations. Magnetization and demagnetization of the workpiece can be controlled via the machine tool buttons. Before using the electromagnetic chuck, wipe the surface clean to avoid scratches. Avoid severe impacts to prevent affecting accuracy. After use, clean thoroughly and apply anti-rust oil to prevent corrosion. When using an electromagnetic chuck independently, ensure it is grounded to prevent electric shock injuries due to leakage.

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