DUNKES – high-tech from the factory

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Assembly and joining

Assembling or assembly is the controlled joining of prefabricated components or sub-assemblies. A subset of this is "joining".

DUNKES builds a variety of assembly presses specifically to customer needs for the assembly of components.

 

Presses in C-frame configurations, 2 and 4 column configurations, or as frame presses.

 

A force-distance measurement system is generally used for a controlled assembly process (direct or indirect measurement, depending on accuracy needs)

 

Direct measurements are generally performed with a load cell installed in a calotte on the ram cylinder. Indirect measurements are performed with a strain gauge on the stand front or with the system pressure of the press hydraulic system.

 

A 'Pass' message is displayed when the assembly process was performed within the specified force-distance envelope. A 'FAIL' message is displayed when the assembly process malfunctioned. On request, this message can be coupled with disabling the press for further assembly process steps. A subsequent release is then only possible if the press is deliberately reactivated.

 

Presses can be configured as standalone machines, or for integration into production lines.

 

Standalone presses are typically fed by manually (low component weights) by placing the component into the tool clamped into the press.

 

When there are access restrictions, or the press needs to be fed by crane for weight reasons, it is also possible to use sliding tables (single sliding table, 2 sliding cables in a V configuration).

 

On manually operated presses, the press stroke is released by a two-hand trigger or with a precise joystick control with safety button.

 

Description:

  • The safety button and joystick must be actuated concurrently, or within 0.5 seconds of each other. The piston travels at a speed proportional to the joystick deflection.
  • When the brake position is contacted during the downstroke, the joystick is ignored.
  • When the lower limit position, or the pressure switch is triggered, the ram automatically travels upward until the upper limit position is reached. The joystick no longer needs to be actuated after the switch, since the backstroke is performed automatically.
  • When the lower limit position or the pressure switch is not triggered, the ram remains in this position.
    The ram can only travel upward after the joystick is actuated in the opposite direction.
  • When the safety button is no longer pressed during the downstroke, the maximum ram speed is 10 mm/s. The automatic lower limit switch is triggered by the limit position or the pressure switch.
  • When neither function is triggered, the joystick must be actuated in the opposite direction to travel upward with the ram.
  • When the safety button and the joystick is released during downward ram travel, so that the joystick is in the centre position, the ram immediately stops in this stroke position, A new rapid ram motion can be initiated when both actuating elements (safety button and joystick) were in the home position.