The main axes Z, Y, X: minimal vibration, high capability, high speed

Z-stroke – the traverse axis

The traverse axis in precise, solid steel girder construction provides exact par-allelism of the guide rails for low-vibration movements. The DR 711CNC and DR 713 CNC models have the Z-stroke driven by a tooth belt, all larger models (DR 721 CNC-DR 753 CNC) by rack-and-pinion. This reduces wear also in high-performance operation to a minimum.

Y-stroke – the vertical stroke

The vertical axis made of rigid steel or an optimised-section, aluminium extrusion profile is designed for high rates of acceleration and deceleration. The drive of the axis is by toothed belt (DR 711CNC - DR 731 CNC), or, upwards of the DR 732 CNC – DR 753 CNC, by rack and pinion. In addition, all DR 7x3 CNC sizes are equipped with a Y-telescopic stroke. This doubles the speed of the gripper, resulting in an extremely short removal time, even with a long vertical stroke, and also reduces the silhouette of the robot.

X-stroke – the demoulding  stroke

The supporting section of the X-axis is an extremely rigid, solid aluminium extrusion profile while, in the case of the DR 753 CNC robot model, it is a steel profile. Optimised for torsional rigidity with minimum mass, the structures feature balanced weight distribution and low vibration levels. This results in high precision in loading and unloading – especially under conditions of high travel speed.

The secondary axes C, A, B: with pneumatic or servo-motor drive options

C-axis, swivel axis for 90° rotation for depositing the parts (standard)

The high-torque, pneumatically driven C-axis is teachable for the 0° and 90° final positions – optionally, interlocking is possible in the 90° demoulding position. Depending on robot sizes, modified and, alternatively, servo-motor driven variants are available.

A-axis, rotate gripper clockwise/anticlockwise (option)

The rotatable A-axis is available as a two-position (0°/180°) or, alternatively, as a 3-position module (0°/90°/180°). Depending on robot size, servo-motor-driven variants are available with 0°-270° rotation angle, also combined with a servo-motor-driven C-axis.

B-axis – vertical arm of robot rotatable (option)

The B-axis is available for complex stacking and frequently changing unloading tasks (part removal from nozzle side/ejector side). Motor-driven, the vertical arm of the robot is capable of being rotated in 15° steps through up to 270°. Depending on robot size, this axis option is also available with stepless, teachable servo-motor drive.

The drive: Brush-less servo-synchronous drives on all 3 main axes XYZ with 3 servo-controllers for full axis-parallel operation

Generally, all DEMAG robots are equipped with drive packages that are perfectly matched to their specific task:

• with brush-less servo-synchronous drives and 3 servo-controllers as standard – also ultra-high-speed
   versions for certain robot types – each with parallel operation of the main axes and capability to approach
   start and target points in space via freely selectable data points (quasi-path control).
• The equipment-internal communication of the distributed-type servo-controllers, electronic system, and
   microprocessors is by fast data bus systems.

The control cabinet: integrated at the back of Z-girder

Thanks to small-size control components, all DR 7xx CNC linear robots from Demag have the control cabinet arranged at the back of the Z-girder, which eliminates the need for floor space for an external control cabinet.

Control of external peripheral devices for complex automation tasks can be up-graded for up to 128 I/ 128 O. If required, these are provided in a separate communication module at the automation periphery and activated by means of a CAN-bus by the robot.

Control and signal transmission: by teach-in- and CAN-bus systems

All Demag robots of the DR 7xx CNC series come with teach-in control with a CAN-bus system. The primary advantage is in a high degree of reliability because fewer cable and plug connections are needed for the moving elements. For instance, all lines coming from the gripper are directly bundled to a control module with exchange of signal conditions being effected by a single CAN-bus cable with control and remote operation.

All Demag robots are designed to communicate freely with the injection moulding machine via an optional CAN-bus data interface. The advantage: the setting data of the robot can be stored together with the associated machine setting program. Moreover, all important functions of the production cell are controlled from the Ergocontrol operator terminal: i.e. from activation of automation functions and manual movement of the axis through to clear text error display.

Manipulation and programming: effortless and simple

The effortless control system with CNC 6.2 teach box, LCD-colour screen, and graphic operator interface or, alternatively, R7 touch-teach-box with innovative operating concept by means of the touch screen makes programming of the Demag robots very simple and provides full operator assistance through:

• Graphic programming by teach-in system,
• Pre-programmed standard sequences,
• Alternatively, change-over to menu-guided, clear-text programming as well as
• Storing of system and application programs on Smart Media cards.