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CellCore: Precision Screwdriving Technology for Modular Production Cells

CellCore screwdriving systems represent compact, torque-stable drive units used in modular production cells and automated assembly lines. The design combines precise control technology with robust mechanical components, enabling users to achieve repeatable screw connections under varying process conditions. Typical applications include the assembly of electrical components, housing screw connections in the electronics and mechanical engineering industries, and applications in the automotive supply chain where component tolerances and process times must be tightly controlled.

Design and Materials

CellCore drives consist of corrosion-resistant light metal housings (mostly anodized aluminum) or hardened steel components for high-load versions. Shafts and gearing elements use tempered steel or stainless steel (e.g., 1.4104/1.4301) to minimize wear and galling. Internal planetary gears are typically hardened and ground to ensure low backlash and long service life. Bearings are designed as angular contact ball bearings or needle bearings, matched to the axial and radial loads of the respective application. Elastic elements for vibration damping are made of polyurethane or silicone compounds with defined Shore hardness to reduce recoil and vibrations.

Designs and Sizes

CellCore modules are available in several sizes, differing in output torque, no-load speed, and installation dimensions. Compact inline designs offer a short overall length for tight installation situations, while right-angle versions solve access problems in confined assembly situations. Variable output variants include hexagon sockets from 1/4" to 1/2", quick-change bit chucks, and customized special mounts for screws with specific head profiles. The materials used and the heat treatment of the gear parts determine the continuous load capacity and maintenance interval.

Connections, Sensor Technology, and Control

Electrical connections are made via standardized M12 connectors or customized shielded cable assemblies for EMC stability. Pneumatic variants use compact quick connectors (G1/8" to G1/4") with integrated throttling for feed rate control. Sensor options are integrated for process monitoring: torque sensors (torsiometric or strain gauge-based), speed sensors (Hall or optical encoders), and displacement measurement systems for depth shut-off. Control can be direct via fieldbus protocols (Profinet, EtherCAT, CANopen) or integrated into PLC environments via simple digital/analog interfaces.

Seals, Protection, and Ingress Protection Classes

For industrial environments, CellCore modules are available with various sealing concepts. Standard seals use NBR (acrylonitrile butadiene rubber) for general oil repellency, FKM/Viton for increased chemical resistance, and PTFE lips for higher temperatures and abrasive media. Minimized gaps, shaft-side labyrinth seals, and optional dust caps increase service life in dusty or chip-laden environments. Typical protection classes range from IP54 to IP67; specific variants for wet or splash water environments also achieve IP69K.

Quality Features and Performance

Key parameters include starting and holding torque, maximum speed, tightening repeatability, and cycle stability. CellCore systems are characterized by low tightening torque tolerances (<±3–5% for correctly calibrated units) and robust temperature behavior. Life cycle tests are carried out according to ISO standards for screwdriving technology and gears, including continuous running cycles under defined loads and lubricant parameters. Lubricants are available both mineral oil-free for electronics assembly and high-temperature greases with specified NLGI class for increased thermal loads.

Practical Application Examples

Example 1: Assembly of PCB housings in a semi-automatic production cell. A CellCore inline drive is integrated into a robot cell. The control receives the target torque and end position information via EtherCAT. At a defined distance, the tool inserts a screw and reaches the target torque via the torsiometric sensor. The software compares target/actual, aborts in case of error, and marks the component for rework.

Example 2: Series screwing of hydraulic housings with high tightening values. Here, a right-angle CellCore variant with reinforced planetary gear and steel housing is used. For process reliability, a sequence is programmed: hard tightening in two stages (tightening at low speed, fine adjustment with higher precision), documented and fed into the MES via OPC UA.

Example 3: Integration into test benches for sheet metal screwing in lightweight construction. The units work with bit-changing adapters and are equipped with IP67 protection and NBR seals. Tolerance deviations are detected and logged via reverse rotation monitoring. Modular mounting brackets allow quick tool changes, reducing downtime.

Selection Criteria and Specification Recommendations

Select CellCore models based on the following parameters:

• Required tightening and loosening torque, cycle time and installation space, required protection class, and control interfaces.

Before procurement, define the screw material, head profile, and tolerances, as these influence the selection of the bit holder, the damping and recoil concept, and the sensor technology. For frequently changing screwing cases, a quick-change chuck with automatic bit recognition is worthwhile; for high demands on process documentation, integration with MES via OPC UA or Profinet is recommended.

Maintenance, Calibration, and Spare Parts

Maintenance intervals are based on operating conditions and should include lubricant inspection, seal inspection, and functional testing of sensor technology. Calibration of torque and displacement sensors must be carried out periodically according to the reset protocol; critical applications require recalibration after certain operating hours or after each major tool change. Spare parts such as planetary gears, bearings, and seal kits should be stocked per size to minimize downtime. For service and detailed data sheets, please refer to the technical pages and application examples: Technology and Application Examples.

Integration into Production Processes

CellCore systems scale from single machines to complete production cells. For line integration, attention must be paid to cyclic load changes, temperature drift, and EMC interference. Programmable tightening sequences enable multi-stage processes (pre-tightening, final tightening, release), feedback via digital release, and error classification. For traceable production, interfaces to MES and ERP are recommended; these allow batch, lot, and serial numbers to be stored in the screwing log.

Safety and Compliance

Check CE conformity, RoHS, and REACH requirements for material selection, especially when in contact with safety-relevant components. In critical applications, the use of flame-retardant or low-abrasion lubricants should be provided. Special ATEX-compliant variants are available for Ex-hazardous areas; if required, the selection should be geared towards explosion-proof connectors and conductive housing components.

Procurement and Documentation Notes

When ordering, specify complete parameters: size, output form, desired protection class, connection type, required sensor technology, desired protocol, and lubricant option. Request drawings for installation dimensions, test certificates, and calibration protocols. For in-depth technical data sheets and customization options, visit our technology page: https://maku-industrie.de/technik.

Conclusion

CellCore systems provide precise, modular screwdriving technology for demanding production environments. Crucial factors are exact specifications for torque, interface, and environmental conditions to select the appropriate design, sealing, and sensor technology. The robust construction and diverse integration options enable seamless process control and traceability in industrial applications.

FAQs

1. What protection class do I need for use in machining with coolant contact?
For direct coolant contact, at least IP67 with PTFE or FKM seals is recommended; for strong high-pressure cleaning, IP69K is advisable. Additionally, pay attention to corrosion-resistant housing materials and sealed connectors.

2. How often do CellCore torque sensors need to be calibrated?
Calibration intervals depend on the frequency of use and the criticality of the application. General recommendation: calibration after 6–12 months or after defined operating hours/cyclic load changes; for safety-relevant applications, after each shift change or according to internal QM specifications.

3. Which data protocols are available for process integration?
Common interfaces include EtherCAT, Profinet, CANopen, and OPC UA. For simple PLC integration, digital inputs/outputs and analog signals are available. Choose the protocol according to your PLC and MES landscape to ensure seamless documentation and real-time monitoring.