Quality control of keys for cylinder locks
Huf-Tools knows industrial automation with industrial robots particularly well. In a plant designed by the company, six different types of keys of make Carl Eduard Schulte are measured, tested, and sorted according to the measurement results.
The requirements to be met by the system are very high: an almost 100% availability of the plant with an error ratio of max. 20 ppm, high flexibility through optical recognition procedures, and short cycle times, without any loss of precision. An ideal task for the Epson 6-axis robots of the ProSix series with their six degrees of freedom and maximum reliability.
Within the work cells, an Epson 6-axis robot PS3L takes over the complete handling and quality assurance of the provided keys in interaction with a fully integrated Epson image processing system.
The milled keys are fed into the machine manually on bar magazines (sticks). The rotary table clocks the magazines filled with up to 1,200 keys into pick-up position.
The Epson 6-axis robot grabs a key from the receiving unit and moves it into an opening in the test box. In this position, the integrated Epson image processing programme Smart Vision takes a picture of the specimen and delivers precise data on the exact position of the key in the gripper. A correction value is calculated via an actual-target comparison and transmitted to the robot controller via Ethernet.
This correction value is converted into robot coordinates by the RC170 and passed on to the manipulator. As soon as the key is placed exactly in the measuring position, Epson Smart Vision measures the bit of the key. At the same time, the interval between troughs and crests to the reference edge codes the type of key. To measure the longitudinal profile, a laser scanner that scans both profile sides is used. A rotation in the tool coordinate system ensures a perfect spin around the key longitudinal axis.
The next step is the online-comparison of the measurements with the data in the C.E.S. database. The perfect keys are stored in a stacking magazine in the rotary transfer unit; faulty keys are stored in a separate storage unit.
Benefits at a glance: