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ISAC s.r.l.
Experience

Dental milling machines

Costantino has wisdom teeth

The companyJekran builds machines for cutting stone and composite material slabs, and uses a special pump system of its own construction.. The large size of the machine requires high rapid speeds, the movement of the beam with two synchronized motors and the need to reduce axis homing times.

The use of high-pressure water jet poses several problems of taper compensation and beam deviation.

The machining operations are defined by a CAM specialized in complex machining and capable of making the most of water cutting technology.

All our experience with these machines:

  • 5-degree-of-freedom dental milling machines with single-wafer tilting table for the blank, with possible automatic loader of the associated material.
  • 5-degree-of-freedom dental milling machines with a turn-mill configuration and multiple pod storage for unattended, high-volume production.
  • Automatic tool change with tray or rotary disc, with measurement of tool length and integrity.

CNC Architecture

  • PC-based solution: a single hardware containing the CNC together with the operator interface with separate and independent resources, to increase reliability and keep the solution costs low.
  • Remote modules and servomotors connected via EtherCAT fieldbus: a single cable connects and integrates all devices.

CNC Main Features

  • ISO6983 standard machining syntax, which facilitates integration with CAM.
  • Controlled jerk movements for all axes involved in the movement and separately for the tool tip, to avoid mechanical stress and obtain the best finishing surface
  • TCP functionality: allows you to program the tool tip's machining path and the position of the rotary axes. All inevitable kinematic variations from the ideal model due to mechanical assembly are compensated by the CNC, so that the same machining program executed on different machines produces the same result.
  • Management of tilting table and turn-mill kinematics.
  • High-speed machining (HSM): allows you to balance precision and processing time, while maintaining maximum repeatability. CNC maintains the tool tip trajectory within a set threshold, which varies based on the current machining phase.
  • Safely withdraw the tool from the material in the current arbitrary tool direction, in the event of a machining pause command.
  • Twin tool management: the CNC manages the tool life and selects the valid tool among the compatible ones.
  • Periodic tool integrity checks: in the event of an anomaly on unattended machines, the CNC loads a healthy replacement tool and resumes machining from the last successful check.
  • Fast Drive Replacement (FDR) functionality: The CNC contains all the parameters of drives, inverters and all other intelligent remote devices, so they can be easily replaced and calibrated.

Industry 4.0

  • Complete diagnostics through machine event recording that can also be analyzed remotely 
  • Measurement of motor absorption, following error and all other data relevant for predictive maintenance available on the CNC.
  • Integrated OPC UA server that exposes productivity data and current machine status to a line supervisor and allows remote control.

PLC logic environment

  • Powerful PLC environment compliant with IEC61131: allows the OEM customer or system integrator to independently customize the application.
  • Extensive application libraries, continuously updated and expanded: allow for continuous and simple improvement of many machine projects simultaneously.
  • Compatibility with third-party components: facilitates integration with chargers or other auxiliary devices to the machine.

Digital Twin

  • Interpretation of the machining program with the same motor present in the CNC.
  • Simulation of the machining process on the machine with verification of any mechanical interference, including pneumatic and auxiliary movements.
  • Simulation of material removal with verification of compliance with the finished model, technological processing constraints, and identification of unmachined parts.
  • Accurately predict machining times, and calculate the remaining time for a job when connected to a real CNC.
  • Integration with data present in the CAM.