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Bosch Fuel Injection

Bosch Fuel Injection

Bosch Opts for Vitronic’s Inspection Technology!

Bosch is using six VINSPEC automated inspection units from Vitronic to ensure the flawless production of its new piezoelectric actuators. Piezoelectric actuators work in car engine fuel injection systems to reduce fuel consumption, noise, and carbon emissions. They make for clean, efficient running vehicles.

What is piezoelectricity?

Piezoelectricity is the ability of some materials to generate an electric field in response to applied mechanical stress. This effect is reversible – such materials produce mechanical stress in response to an applied electric field.

How do piezoelectric actuators work?

A vehicle’s fuel injection system injects pressurised fuel into the engine cylinder through a valve in precise quantities at precise intervals. Traditional injection systems open and close this valve using electromagnets. Bosch’s new actuators use piezoelectricity to control the valve quicker and more accurately than traditional systems, which makes for an efficient engine.

Foil printing

Bosch’s new actuators consist of stacks of special piezoelectric ceramic foils printed with strip electrodes, and guide marks to ensure accurate stacking. After printing, a robotic gripper deposits foils on a conveyor. Fast line-scan cameras from Vitronic capture high-resolution images of each as they travel along.

The first VINSPEC system inspects these images to identify flaws on foils, such as holes, missing print, and bleeding. It also checks the position of the strip electrodes and guide marks. If the foils pass all inspections, they are dried and sent for stacking. Faulty foils are unusable, so VINSPEC immediately discards them.

Precise automated stacking

Robotic grippers then stack several foils into a block on a positioning table. Accurate stacking is essential to ensure actuators function correctly. By analysing images acquired by its cameras, the second VINSPEC system identifies a foil’s guide marks and calculates its position, before instructing the robotic grippers to stack the foils precisely. Completed stacks are laminated. This causes the foils to harden and form solid blocks. Without using the machine vision system VINSPEC it wouldn’t be possible to produce functional actuators.

Raw actuator processing

Next, a specially coated saw automatically divides the hardened blocks into bars and then into so-called ‘raw actuators’. Cutting bars into raw actuators is a delicate process. An incorrect cut can interrupt the strip electrodes and render actuators unusable. The third VINSPEC system captures photographic images of foil blocks, measures each bar to the nearest micrometer, and coordinates the saw to product precise cuts.

The fourth VINSPEC system inspects the function and quality of the raw actuators before sending them for further processing. Checks include actuator dimensions and electrode position. Only flawless actuators pass to the next production stage.

Final production stages

Bosch applies a layer of insulation finish and electrical strip contacts to actuators before installing them into the fuel injectors. Finish must be evenly applied and bubble free. Strip contacts require careful soldering and must be clear of finish. Defects lead to short circuits, which render actuators unusable. The fifth and sixth VINSPEC units monitor these processes, and immediately discard faulty actuators.

Complete control

Operators can observe the inspections on monitors at each VINSPEC station. Graphical user interfaces mean results, live photographic images, and system status reports are all easily accessible, allowing operators to intervene if they detect production discrepancies. All inspection results are stored, allowing Bosch to produce statistical evaluations and optimise its manufacturing processes.

For more information visit http://www.vitronic.de

About the Author

Malcolm Smith is the UK Sales Manager at Vitronic. Vitronic is a leading supplier of machine vision systems. A global company, it provides advanced technological solutions to a broad range of markets, such as logistics, traffic control, pharmaceutical manufacturing, and industrial robotics.

For more information visit: http://www.vitronic.com

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