Wie eine verbesserte Problemlösung die Qualität in der komplexen Fertigung unterstützt

 

COMAU, a company part of the Fiat Chrysler Automobiles (FCA) Group, designs products – including robots – systems and solutions in the industrial automation field for its customers worldwide.

One piece of equipment COMAU manufactures is the body-side framer. It is a large and critical component on automotive body assembly lines. It holds and aligns the left-half and right-half vehicle body sides to the underbody, so they can be welded together precisely. Operational quality and reliability are of extreme importance both to COMAU and its customers.

During 2016 and early 2017, COMAU was preparing a body-side framer to fulfill a customer order. During prototype testing, it was discovered that a small, but significant part, the Y-axle closure, would not open completely. Since the body-side framer must move into the assembly process with extreme precision in the X, Y and Z axes, the failure of the Y-axle affected the entire operational effectiveness and efficiency of the equipment, by creating an entire station stop.

This resulted in an average MTBF (Mean Time Between Failures) of 50.000 cycles during Q1, 2017 prototype testing (see chart below), but the standard MTBF for the Y-axle, according to the supplier, is 500,000 cycles.

Die Auswirkungen der Qualität auf materielle und immaterielle Kosten

To the CFO, achieving and delivering maximum quality is a matter of the cost of making and fixing the company’s products. To the quality manager, quality relates to optimizing or improving customer relationships. Failing to determine and resolve the root cause of the Y-axle problem in a timely manner, however, would have impacted tangible and intangible costs in many ways.

In virtually all manufacturing environments, quality’s impact extends well beyond ROI calculations. The intangible connection to quality is also the perception by the industry and current and prospective customers that the products, equipment and machinery they use in their production processes are reliable and the company manufacturing them is a dependable supplier.

The tangible costs could be represented by potential delay caused to the customer’s industrialization planning, and the potential request penalties for delay. The second is directly connected to MTBF. OEMs have a special procedure to calculate the loss brought by a line stoppage.

The intangible costs, however, were much greater. This equipment is potentially suitable for all the next customer’s new projects. Thus, customer’s dissatisfaction, followed by a change in terms of his equipment strategy would have had a short-period impact on costs and ROI for COMAU; however, it’s the impact of future sales that is more significant.

COMAU’s framer is designed for the entire lifespan of customer products. With good maintenance, life could be extended up to more than 20 years as it was for the previous version of COMAU’s framer product. In that period of time, several new customer’s product launches and customer’s products could be extended to other plants. A lack of reliability on COMAU’s new framer could affect the company reputation in the Body in White market, where COMAU maintains global leadership.

Zu den immateriellen Kosten gehören mehr als nur langfristige Einnahmen. Selbst einige der größten globalen Fertigungsindustrien, wie die Automobilindustrie, sind kleine Gemeinschaften. Ein Qualitätsproblem dieser Größenordnung kann sich daher auf die gesamte Branche auswirken und zu einem Verlust an Ansehen, Zuverlässigkeit und Verlässlichkeit führen - und zu nicht realisierten zukünftigen Unternehmenseinnahmen und Wachstum.

Behandlung des Qualitätsproblems mit der Problemlösungs- und Entscheidungsfindungsmethodik (PSDM) von Kepner-Tregoe

Die COMAU-Ingenieure gingen an die Herausforderung der Qualität des Karosserierahmens heran, indem sie sich vorstellten, was die Grundursache sein könnte, und dann verschiedene Hypothesen formulierten, um eine Lösung zu finden. Als die Lieferfrist des Kunden 100 Tage erreichte und noch keine Ursache oder Lösung gefunden worden war, wandten sich die Ingenieure an Luca Baciarello, den Reactive Manager und Ausbilder der FCA-Region EMEA, der auch der Leiter des Kepner-Tregoe-Programms (KT) des Unternehmens war.

Wie er aus seiner KT PSDM-Ausbildung und -Erfahrung gelernt hatte, ging Herr Baciarello die Qualitätsherausforderung ähnlich wie ein Detektiv an. Anstatt sich vorzustellen, wie das "Verbrechen" begangen wurde, konzentrierte er sich darauf, Fragen zu stellen, nach Hinweisen zu suchen, Fakten zu sammeln und die gegensätzlichen Elemente des "Falls" zu untersuchen.

"Die beste Lehre aus dem PSDM von KT ist, dass man Lösungshypothesen erst dann in Betracht zieht, wenn man den Prozess methodisch anwendet", so Baciarello.

Mr. Baciarello asked for 30 days to investigate and determine the root cause of the quality issue with the body-side framer. By working closely with the supplier of the Y-axle and applying the KT methodology specifically, distinction logic, and building a KT problem specification using is, is – not pairs then, applying KT distinctions and changes, the root cause was identified and a solution was implemented.

Following the adjustments to the body-side framer, the MTBF increased 10 times without stopping during the subsequent 5 months prototype testing. In addition, the supplier of the Y-axle re-designed and started to produce a new version of its previous standard Y-axle part.

Because of Mr. Baciarello’s successful application of KT PSDM, COMAU’s leadership recognized its potential and initiated KT training for various groups of employees, with a final objective to establish a strategy for an efficient problem-analysis approach throughout the company.

  • 22 Auszubildende im Jahr 2017 in den Kursen des FCA-Reaktivprogramms
  • 30 Auszubildende im Jahr 2018 und kontinuierlicher Ausbau in den Folgejahren
  • Die COMAU-NAFTA-Region ist ebenfalls an dieser Schulung beteiligt.
Über COMAU

With more than 40 years of industrial automation experience, COMAU is a global leader in the industrial automation field. Its competencies range from joining, assembly and machining to complete, robotized manufacturing systems and asset management services, which includes the application of advanced technologies that are fully connected for real-time monitoring and control. COMAU has 35 offices, 5 innovation centers and 15 manufacturing sites in 17 countries worldwide.