Quality Assurance and Process Visualization
Programme QAPV (Quality Assurance and Process Visualization) is a 32 bit application for PCs using Microsoft Windows® and has been purpose-developed for the riveting machines of D. Friedrich GmbH & Co. KG.
The purpose of the QAPV software is to adopt and transfer, archive and visualise the process data recorded during manufacture.
The QAPV software can be run directly on the industrial PC installed on the machine, or on an external PC which may be located for example in the foreman's office. The data link to several machines is ensured via an Ethernet network (TCP/IP).
If the data link between the QAPV software and the machine PLC is active, after each production step the process values determined during processing are read out from the PLC and saved in the SQL database.
The QAPV software can be run offline, without a connection to the machine, for example to evaluate the archive files copied from the machine on an external office PC.
On page Measured Values – Riveting the riveting process values logged by all machines are displayed, edited statistically and represented graphically provided that they meet the filtering conditions set previously and that the maximum number of data records that can be displayed is not exceeded.
The displays are updated automatically when new data records meeting the current filtering conditions are received from the connected machine controls.
The diagram represents the respective logged minimum, actual and maximum values of the axis activated with the big statistics buttons. The min. and max. limits are plotted as red curves while the actual values are shown as a green one.
The table lists the logged process values matching the active filter settings.
The buttons used to switch between the graphically displayed process values show the average value, the standard deviation and the CpK value.
Archiving the Process Values:
To keep the database small and, in consquence, to keep the access to it fast, the QAPV software package includes an archiving programme.
Every month is given its own archive file in which all data, including the list of data sources and the plaintext error messages, is stored.