German rofri workholding fixtures rofri model rofri price

rofri 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 tool grinders, gantry milling machines, and gantry planers. Lifting screw holes are located on both sides of the rectangular electromagnetic chuck; insert T-shaped screws for lifting during installation. Secure it to the workbench using T-shaped blocks and screws, connect the DC power supply and ground wire from the machine tool, and then precision grind the upper surface of the chuck once to ensure parallelism between the upper and bottom surfaces. 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.

rofri workholding fixture types

1) Standard rectangular electromagnetic chuck Application: Surface grinding machines with rectangular tables. 2) High-power electromagnetic chuck Application: Milling machines, planers, machining centers. 3) Fine-pole electromagnetic chuck Application: Surface grinding machines with rectangular tables, milling machines. 4) Multi-function high-power electromagnetic chuck Application: Surface grinding machines with rectangular tables. 5) Rotary electromagnetic chuck Application: Various surface grinding machines. 6) Electromagnetic chuck for tool grinding Application: Tool grinding machines. 7) Circular electromagnetic chuck (concentric pole type) Application: Surface grinding machines with circular tables. 8) Circular electromagnetic chuck (radial pole type) Application: Surface grinding machines with circular tables. 9) Circular electromagnetic chuck (flower pole type) Application: Surface grinding machines with circular tables. An electromagnetic chuck is an electromagnetic fixture that secures workpieces using the holding force generated by the chuck body when the electromagnetic coil is energized. The electromagnetic chuck consists of an iron core, coil, panel, and bracket. The electromagnet, composed of the coil and iron core, is the main component of the electromagnetic chuck.

rofri workholding fixture features

1) Chuck holding force: The electronically controlled high-power chuck offers superior holding force, up to 16kg/cm², with uniform and adjustable magnetic distribution. It is suitable for various heavy-duty machining, roughing, and finishing operations. Standard high-power chucks have weaker and uneven holding force, failing to meet heavy-duty machining requirements. 2) Machining accuracy: The holding force of the electronically controlled high-power chuck does not require continuous power supply, generating no heat during continuous operation, thus avoiding thermal deformation of the workpiece. Its 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 over time. This causes workpiece thermal deformation and reduces chuck magnetic force, compromising machining accuracy. 3) Performance: The electronically controlled high-power chuck can operate continuously without failure or maintenance, even for more than 20 hours per day. Standard permanent magnet chucks show reduced holding force after about half a year of use. Standard electromagnetic chucks can only operate for a few hours daily, are prone to failures, and require frequent replacement and repair of internal components. 4) Operational efficiency: Using standard high-power 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. The electronically controlled high-power chuck features automatic auxiliary positioning. Simply pressing a button completes workpiece clamping or release in 0.3 seconds, significantly improving production efficiency.

rofri workholding fixture maintenance

1) Check before use whether the limit dimensions remain in the correct position. 2) If stop pins are excessively worn, they can be ground and repaired. If baffles, pins, or locating taper pins are excessively worn, reassemble them, offsetting the worn areas for continued use. 3) Apply anti-rust oil after use. Regular long-term lubrication maintains the service life of synchronous fixtures. Incorrect lubrication leads to reduced clamping force, poor accuracy, wear, and seizing, so proper lubrication is essential. After machining, clean the synchronous fixture body and slide ways using an air gun or similar tool. To clean internal chip accumulation, remove the dust cover fixing screws, take off the dust cover, and open the main jaws to their widest position. Use rust-preventive cutting oil to avoid reduced clamping force due to rust. Perform a thorough cleaning of the synchronous fixture every six months (at least every two months when machining cast iron or copper parts). Check parts for damage or wear, and replace with new parts immediately if severe. Lubricate thoroughly before assembly.

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