Digital Threads

Vision Tech in the Digital Lifecycle - Part 1/2
Together with the increasing importance of Industry 4.0, the Digital Lifecycle defines a strategic theme in advanced design and manufacturing and is a key topic for many global players in the industry. The 'Digital Lifecycle' can simply be described as a digital record of a product from creation until disposal - across all phases of the product's life. The following article series describes the role that Vision Tech is currently playing and will play in the future.
Bild: Vision Ventures GmbH & Co. KG

In a typical product lifecycle there are four main phases: design, manufacture, operational life, and disposal. Within each of these phases there are many lower-level processes take place and form the detail of the product lifecycle. Products start with an idea or concept. Requirements are specified, before detailed design and simulation is completed. With a design complete, manufacturing is implemented with sourcing of materials, physical manufacturing, product testing, and packaging the product ready for sale.

Products are then shipped and distributed, and enter their operational life, during which the product may undergo many service processes such as user training, upgrades, and services. Finally, the product reaches the end of its useful life and should be recycled before final disposal.

A key point is that each of these processes can create data and information relevant to the product, and each process can be informed, automated, or improved by access to information from other stages of the product lifecycle. This is the main concept and rationale for what many companies are referring to as the ‚Digital Thread‘; the desire to create a unified, connected, digital record of a product across all stages of its lifecycle, where any user can access any relevant data, anywhere across the ecosystem of suppliers, manufacturers, distributors, and end-users. The strategic drivers for the creation of digital threads are based on the benefits which can be realized by users and the value which can be captured by suppliers of the underlying technology. Digital threads offer increased productivity, traceability, flexible new product introductions, feedback and closed loop quality processes, and additional insights how products perform, are used, and how they fail.

The scope of CAD has increased dramatically over the past years. – Bild: Pick-it N.V.

All these benefits rely on ready access to unified data across a product lifecycle, and it is no surprise that many larger companies are such as Siemens, Cisco, and Microsoft are seeking to play an active role in the digital lifecycle to capture part of the value which can be extracted from this unified data. Although vision tech is not a single technology which underpins the realization of a digital thread, there are many opportunities for the use of vision within the digital lifecycle concept. Vision remains one of the most strategic topics in automated information extraction because of its extremely wide applicability and ability to capture large amounts of information. Many companies are applying vision to enable parts of the digital lifecycle, typically either using or providing information from or to a digital thread.

CAD, Metrology, & Vision

The design phase is the start of the digital thread and often captures the ground truth of a product in a CAD model. The scope of CAD has increased dramatically over the past years, moving from being a capture of the predominantly 3D mechanical aspects of a product, to cover materials and product simulation, design-for-manufacture & design-for-quality guidelines, as well as including marketing aspects such as product branding, product renders, and product promotion. One area where CAD models have been used for many years is in industrial metrology. The model provides the fundamental design intent and defines critical dimensions and tolerances for a part, which are then tested during production by quality engineers using a variety of coordinate measurement machines. A developing theme is the evolution from offline metrology, often taking place in separate measurement rooms, toward at-line and in-line systems that offer reduced materials handling, higher throughput, greater inspection coverage, and automation. This move toward the production line is being accompanied by an increased use of optical sensing as this is more amenable to 100% measurement. Here vision tech is the primary approach, often making heavy use of 3D vision and robotic motion control.

Siemens Digital Industries have recently marketed a new service which is intended to directly provide a user with a trained AI vision model based on the user uploading either a CAD model or 3D scan of the part. – Bild: Siemens AG

Another developing theme is to define directly in the CAD model those features of a part are critical to a design and should be inspected or measured in production, and have this information already present in the CAD package to be consumed by a vision based metrology or inspection system. Examples of these types of system are already being developed by companies such as Zeiss and Kitov Systems, with products that are intended to directly consume CAD files containing relevant inspection or measurement data. This information is then used to automatically generate test plans before completing production inspection and collating and analyzing the results. These types of solutions are ambitious in their scope of automation, but also provide a clear strategic direction to create a link between design-time intent and automated production quality. Interestingly, there is no fundamental difference between metrology operations and vision inspections in the concept of these type of automated solutions. Both metrology and inspection can be included to provide a more unified part or product quality process.

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EMVA European Machine Vision Association

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Bild: CCS. Inc.
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