German ZOLLER workholding fixtures ZOLLER model ZOLLER price

ZOLLER workholding fixtures are machine tool accessories produced based on the electromagnetic principle. Energizing the internal coils generates magnetic force, which passes through the magnetically conductive panel to firmly hold workpieces in contact with the panel surface. De-energizing the coils eliminates the magnetic force, allowing demagnetization and removal of the workpiece. Primary applications include workpiece fixation during the machining of ferrous workpieces on grinding machines, electromagnetic knife grinders, gantry milling machines, and gantry planers. Lifting screw holes are located on both sides of the rectangular electromagnetic chuck; insert T-head screws for lifting, and secure to the workbench using T-head 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 and bottom surfaces. When holding a workpiece, sufficient positioning holding force is achieved by bridging two adjacent magnetic poles, allowing grinding operations. Magnetization and demagnetization of the workpiece can be controlled via the machine tool buttons.

ZOLLER workholding fixture operating principle

The most widely used grippers are pneumatic grippers; they are essentially cylinders powered by compressed air. When air is supplied, the gripper jaws approach and firmly grasp the object to perform other operations. When the air direction is reversed, the gripper releases the object. Typical applications include changing object orientation or moving objects during pick-and-place operations. When gripping a workpiece, appropriate force and shape constraints must be applied to ensure the gripped workpiece is fully released during movement, dwelling, and loading. Additionally, it must ensure that the geometric deviation of the workpiece holding posture remains within the specified tolerance zone.

ZOLLER 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 heavy-duty machining requirements. 2) Machining accuracy: The holding force of electrically controlled powerful chucks does not require continuous power supply, generating no heat during continuous operation, thus avoiding thermal deformation of the workpiece. Simultaneously, the strong and uniform surface holding force ensures highest machining accuracy even if the workpiece overhangs the table. In contrast, standard electromagnetic chucks require continuous current supply, generating heat after prolonged operation, which not only causes thermal deformation of the workpiece but also reduces chuck magnetic force, compromising machining accuracy. 3) Performance: Electrically controlled powerful chucks can operate continuously without failure or maintenance, even when running 20 hours daily. Standard permanent magnet chucks experience reduced holding force after approximately half a year of use, while electromagnetic chucks can only operate for a few hours daily, are prone to malfunction, and require frequent replacement and maintenance of internal components. 4) Operational efficiency: Using standard powerful chucks requires significant workpiece adjustment time, 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.

ZOLLER workholding fixture maintenance

When using vacuum suction cups (without clamps), note that the manipulator's movement speed must not be too high; otherwise, shear forces generated on the suction cup may cause the product to drop easily during rapid twisting. In some cases, a clamp can be used to ensure safe product transport. Considering potential product adhesion to the mold, an air clamp is typically installed to address this issue. If the product surface area is too small or the product is too heavy for vacuum suction cups, clamps can also resolve this problem. If strict aesthetic requirements apply, the clamped area must not be the outer surface. To address this, a sensor circuit can be installed. Once the clamp or suction cup has securely grasped the product, the sensor sends a signal to the manipulator to proceed with the next operation. In cases where the manipulator's motion capability is limited and manual twisting or prying is required to demold or remove the product from the forming area, adding a special cylinder capable of independent movement, unrelated to manipulator operation, can improve this situation.

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