3D Coordinate Measuring Machines ensure the form of bathroom taps
Hansgrohe - Germany
Throughout the world, Hansgrohe AG stands for modern, designer-looking bathroom solutions and innovative sanitary products. Particularly noted is demand for the design of the Axor brand. Its precious water dispensers originate at the headquarters of the company in Schiltach. Brass is given form here, at their own foundry. With machining, grinding, and polishing, the blank gradually becomes a functional design object for the bathroom. Functional and design-oriented dimensions, assembly characteristics, and fitting dimensions of the Axor collections are inspected by the Hansgrohe employees using DEA GLOBAL measuring machines.
They simply rely on two DEA GLOBAL coordinate measuring machines. The first DEA GLOBAL measuring machine is located in the middle of the Metrology Department. It is employed as an all-round measurement system for the initial sample inspection process of various products. To support the production of the Axor collections in particular, Hansgrohe has recently invested in an additional DEA GLOBAL CMM.The new addition has found its place in the separate metrology room close to the Axor Mixers Production.New Creations Taking Shape The DEA GLOBAL CMM in production supports the team in the initial sample inspection. “With an additional DEA measuring machine we’ll reduce development time“, says Jürgen Raddatz, Metrology Manager at Hansgrohe AG. “This way, we’re close to the process, so we can control it, and immediately take action, in case measured values do not maintain the tight tolerances. Prior to that, at Axor Production we were completely dependent on the measuring machine of our central Metrology Department, which is located far away. Now the initial sample inspection is accomplished much faster.“
Automatic In-Process Inspection The new coordinate measuring machine has not only undertaken the tasks of its “colleague“ in Central Metrology. It also replaces the in-process inspection performed by dedicated gauges and measuring devices. Hansgrohe has accomplished successfully the switch over from manual to automatic inspection using the DEA GLOBAL. Jürgen Raddatz explains: “In Axor mixers production, in the past we used manual measuring devices in process. Therefore, we only inspected mixers and showers, we didn’t measure them. Now we have actual dimensions at our disposal. The 3D measuring machine provides us real measured values that we can document and analyse. Previously, it was much more difficult to approach the ideal. Thanks to the measuring machine, today we know exactly how we have to set up our machining centres, and we have the process much more under control.“
Easy Measuring with the Graphic User Interface
Since operators need not perform inspection manually anymore, they can now focus on their core tasks. An indirect effect has been the reduction of downtime of machining centres. Nevertheless, the operators are still involved in the measuring cycle to a certain extent. Daniel Morra, Programming Manager at Hansgrohe says: „We create measuring programs in offline mode for each series in the Central Metrology using the PC-DMIS software.
Data points collected in the blink of an eye
The DEA GLOBAL CMM with a measuring range of 700 x 1000 x 700 mm is equipped with a probing system which is suitable for Hansgrohe applications. On the motorised wrist mounts a probe that takes single points. In addition to that, the probe acts as a scanning system taking up to 100 measuring points per second. The system measures in point to point mode simple geometric features on taps. Forms and fitting dimensions, that require greater accuracy, are probed by the ruby ball on the probe in scanning mode instead. Using probe extensions the system can get access to deeper features as well. Machining and in particular inner fit dimensions are subject to very tight tolerances. All that is out of tolerance is evident after measurement: “The output of the measurement report is configured in a way that the operator can spot deviations only“, Niels Nestler says, Process Optimization Manager.
The decisive factor: CAD Import
The PC-DMIS measurement software with its advantages has convinced Hansgrohe from the start. In the Central Metrology Department, a few years ago, they switched from the 3D metrology of another manufacturer to DEA coordinate measuring machines. “With the previous measuring machines we could not import our CAD data directly from CATIA. As a result, we could not build a measurement program directly from the mathematical model provided by designers“, Raddatz says. “PC-DMIS has the interface instead, so the import is possible. The other systems didn’t match up with PC-DMIS.
As a result, at the Central Metrology Department we switched to PC-DMIS and the DEA systems. It was also obvious for us that the new measuring machine in mixers production had to be a DEA machine. This way we can execute the same measurement programs both on the machine in production and on the one in the Central Metrology Department.“
In the future, Hansgrohe AG will fully exploit the advantages of the results converter. As soon as the results of the new measuring machine in production are available, it will be possible to perform the statistical assessment of the process capability to further optimize the machining activity. The exclusive tap and mixer collections which are used in over 130 countries worldwide in hotels, cruise ships, apartments and private houses could not be manufactured in a more efficient way.