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Machine of the Month - May 2008

DEPRAG Compact 2-Axis Screwdriving Robot for the Assembly of an automotive Power Drive


Requirement: Semi-automatic workstation for the assembly of components (consisting of 3 different parts: Housing, Drive and Lock-Washer) to accurate torque and depth;
8 Assemblies per part fixture in 22 seconds
This machine was made on behalf of a 2nd Tier automotive sub-supplier.

View of the DEPRAG Compact Screwdriving Robot with stationary Screwfeeder
Our Solution: One DEPRAG 1-S Compact-Screwdriving-Robot in gantry-style design, which is equipped as follows:
  • Base Frame with rotary index table with 2-hand operation (2 parts each per part fixture)
  • 2 x OPTO-Touch Start Buttons
  • XY - Axis-System - freely programmable; Z-axis through cylinder stroke
  • Stationary Screwfeeder Model 0511-EP/0,75-1
  • DEPRAG 1-S-SFM-N with pneumatic Spindle Model MINMAT ULTRA
  • 2 x Part Lift-Stations to allow access to the screw locations
  • Part recognition and part presence controls
  • Table-coding for different part varieties
  • Motion Controller Model MC282
  • 1 Machine Status Indication-Light
Cycle Description: An Operator manually loads the part-fixture, which is located outside the machine, with the three pre-assembled parts (consisting of: Housing, Drive and LOCK-Washer).
The Operator confirms that the part fixtures are loaded by activating the 2-Hand OPTO-Touch Buttons.
The rotary-index table automatically turns by 180°, to move the part-fixture into the assembly position that is located within the machine.
Once the part-presence sensor confirms that the part is present, a special gripper automatically removes and stores the LOCK-washers that are located on top of the products. This allows the screw-locations to be freely accessible during the Screwdriving process. Thereafter, the Screwdriving process starts automatically. An assortment of sensors and inquiries controls the accurate assembly both to torque and depth.
If an assembly error occurs, the screwdriver automatically moves to a screw-dump area to unload the mouthpiece and nosepiece. This feature is necessary to avoid a screw-jam within the mouthpiece (tooling) prior to the next Screwdriving cycle.
After all required fasteners have been assembled; the gripper places the LOCK-washer back onto the drive that is now tightened to the housing. Once the Operator has new parts loaded and reactivates the 2-Hand OPTO Touch Buttons, the rotary index table automatically indexes by 180°. The completely finished parts are moved to the machine's exterior where they can be unloaded and moved to the next Station for subsequent processing.


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