NEW TECH: BMW will be making use of 3D technology in the production of future models. Image: BMW Group
Munich - BMW claims it's the first automaker to introduce a unique concept with a fully-automated, optical measuring cell in its pilot factory in Munich.
The automaker claims freely moving robot arms use sensors to create a three-dimensional image of the entire vehicle and generate a 3D data model from the data captured, with an accuracy of less than 100µm (microns). This allows barely visible deviations to be identified at an early stage.
The optical measuring cell is deployed at the interface between development and series production. It forms part of the BMW Group’s digitalisation strategy for production, says the automaker, and supports the high quality standards for production of premium vehicles.
The next generation BMW 5 Series Sedan will be the first to benefit from this new technology.
Using the 3D technology
Eduard Obst, head of Geometric analysis, measuring technology and cubing, total vehicle, explains: “We are delighted to reach this genuine milestone in pre-production with the optical measuring cell: A single measurement provides us with a 3D data model of the total vehicle.
"Lengthy individual measurements and data collation are no longer needed - saving time and enhancing quality at the start of series production.”
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BMW explains a robot arm on rails mounted on each longitudinal axis of the optical measuring cell moves freely as it maps the vehicle in complete space. Occupying a relatively small area, this set-up allows two small, flexible robots to be used in parallel in an optimum working range.
Compared with previous processes, in which robots use a single sensor to record one side of the vehicle after the other, measurements now only take around half the time and are completed within just a few days.
Specialists in the team
The robots are fitted with two sensors that record reference points and then capture individual surface areas of approximately 80x80cm each. These are combined to form a scan of the entire vehicle.
Analysis of the data quickly reveals any deviations, allowing technical integration specialists in the production division to take appropriate action early on.
BMW claims three-dimensional vehicle scanning can be fully automated and performed at off-peak hours or at night, so the measuring cell can be utilised to full capacity. With results delivered promptly, update cycles are shorter or no longer needed. The measurement data and analysis findings are shared online within the production network and also made available to the plant responsible for series production to assist with their preparations.
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The fully-automated optical measuring cell is gaining increasing importance within the BMW Group. This technology has been successfully used in tool-making in Munich since 2015 for complete measurement of individual sheet-metal parts, as well as tool inspection.
The BMW Group is currently exploring the use of automated optical measurement at its automobile plants.
For more, visit www.bmwxplore.co.za/