Machine vision tops sensors in flexibility for Ford body panel selection

Inside Machines: Ford improved flexibility by switching from sensors to machine vision for body panel inspection, increasing reliability, and improving quality and information flow. The noncontact machine vision inspection system avoids significant maintenance required with sensor replacement, easily accommodates new models and design changes, and reduces overall inspection costs.

02/06/2014


Ford selected Cognex In-Sight 7000 series vision systems for this application because of templates for interfacing with popular programmable logic controllers (PLCs) and robots, easy programming, and a compact and rugged design well suited to the productiMany threaded copper studs are used during final assembly to attach components to automobile body panels such as wheel wells. Automotive body panel inspections and bar code reading work better with machine vision than with a sensor array. Traditionally, the panels are inspected for the presence of studs by using a robot to present the part to an array of proximity switches. But the low mean time between failure of the switches and the need to install more switches whenever there is a new model or design change results in heavy maintenance costs. Ford has improved on the conventional method by using machine vision to inspect for the presence of studs and also read barcodes on the body. Machine vision systems are highly reliable and can handle new models or design changes with a quick change in the program.

The machine vision system Ford selected for this application offers templates for interfacing with popular programmable logic controllers (PLCs) and robots, easy programming, and a compact and rugged design well suited to the production environment at an affordable cost.

47 mpg rating

Ford invested $555 million in its Flat Rock Assembly Plant to build a state-of-the-art, fully flexible body shop capable of producing multiple vehicles. Ford added 1,200 jobs at the plant tied to production of the Ford Fusion and will continue to produce the Ford Mustang there. Ford is also upgrading the plant’s paint shop with an environmentally friendly 3-Wet paint process. The next generation Fusion offers a broad selection of fuel-efficient powertrains in the midsize car segment—two EcoBoost-powered gasoline engines, a normally aspirated four-cylinder engine, a hybrid, and a plug-in hybrid. The new Fusion Hybrid’s unprecedented 47 mpg EPA rating makes it America’s most fuel-efficient, nonrechargeable sedan. With each new major plant program, Ford is significantly increasing the flexibility of its equipment and facilities to build multiple vehicles at one location. By 2015, Ford will be able to produce 25% more derivatives per plant than 2011 globally.

As part of the drive to increase the flexibility of the Flat Rock Assembly Plant, Ford closely examined its current inspection methods. It’s critical to ensure that all studs are in place on body panels before they are attached to the vehicle body because assembling a panel with missing studs makes it necessary to interrupt the assembly process while the faulty panel is removed for repairs. The copper studs are assembled to the panels by stud welding guns that hold the studs in place and draw an arc between the stud and the body panel.

By 2015, Ford will be able to produce 25% more derivatives per plant than 2011 globally.

Proximity switches used in the past to inspect the studs had a relatively high failure rate because the studs on each body panel coming down the line can potentially bump the switches as part of the inspection process. Different models, variants, and design changes often use different stud layouts, so additional proximity sensors must be added for each layout. The traditional approach required considerable time from maintenance staff to replace failed proximity sensors and to add new sensors in response to design changes and new models and variants.

More flexibility, less maintenance cost

“We decided to switch to machine vision on this application to improve flexibility and reduce maintenance expenses,” said Scott Vallade, controls engineer for Ford. “We have many body panel inspection applications for the Fusion, so our goal was to find an economical solution that would address all of these applications. With the large number of applications, we were also interested in reducing implementation time by finding a tool that’s easy to program and can be customized with a standard input/output scheme that will work with all of the plant’s robots and programmable logic controllers to enable the integrators setting up each application to focus on the vision problem. We wanted an economical solution that could survive in the plant environment.”

The cameras selected are “the best match for our body panel inspection applications,” Vallade said, supporting many communication protocols. The vendor “set up a custom template that communicates with all the equipment in our plant so that our integrators can focus on programming the vision application.”

The vision systems include preconfigured drivers, ready-to-use templates, and sample code to accelerate system setup and ensure smooth communication with factory automation robots and controllers. Included are drivers, templates, and sample code for open standard industrial Ethernet communications protocols, such as MC Protocol, EtherNet/IP, and Profinet for connection to a wide range of PLCs and other automation devices from Mitsubishi, Rockwell Automation, Siemens, and other manufacturers. Preconfigured drivers, ready-to-use templates, and sample code are available for robots by ABB, Denso, Fanuc, Kawasaki, Kuka, Motoman, and Staubli.


<< First < Previous 1 2 Next > Last >>

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Additive manufacturing advancements; Machine vision enhances robotics; Fieldbus evolution; Process safety; Advice from System Integrators of the Year; Road to IANA
Salary and career survey: Benchmarks and advice; Designing controls; Remote data collection, historians; Control valve advances; Hannover Messe; Control Engineering International
System integration: Best practices and technologies to help; Virtualization virtues; Cyber security advice; Motor system efficiency, savings; Product exclusives; Road to Hannover
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.
PLCs, robots, and the quest for a single controller; how OEE is key to automation solutions.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
Getting to the bottom of subsea repairs: Older pipelines need more attention, and operators need a repair strategy; OTC preview; Offshore production difficult - and crucial
Digital oilfields: Integrated HMI/SCADA systems enable smarter data acquisition; Real-world impact of simulation; Electric actuator technology prospers in production fields
click me