Schrittweise zu mehr Transparenz

The company’s headquarters are located in Eschen/Liechtenstein, where the company was established as a pressing and stamping plant in 1941, producing small parts at first. At the beginning of the 60s, the company entered the automotive supplier business and has developed into a producer of steering columns, steering gears and complete electro-mechanical steering systems over the years. Presta AG has belonged to the thyssenkrupp company group since 1991. 

The company accompanies the trends in the rapidly changing automotive industry towards electric mobility as well as automated and, in the next level, autonomous driving with its technology competence. A worldwide ultramodern production network set up in recent years caters to the vehicle platforms of almost all internationally renowned OEMs. However, the product portfolio of the steering division is not dependent on a vehicle’s drive type. The division has been able to more than double its turnover over the last ten years by expanding its product portfolio and through new customer projects.
 

The site of thyssenkrupp Presta in Schönebeck manufactures components for the company’s global network. Parts are produced here for various types of steering, such as ball-type linear drives and input shafts, as well as new types of steering for electric cars. As there are many variants for all types of steering, the variety of parts is increasing accordingly. Individual parts such as pinions and input shafts as well as preassembled parts are sent from Schönebeck for final assembly to different sites, above all in China, Europe, USA and Mexico. The steering systems are then assembled there and sent to car manufacturers.

A wide variety of machinery is available to the 800 employees in Schönebeck. This includes forging machines used to produce pinions. Grinding machines, lathes and milling centres are used for mechanical machining. The assembly area for constructing the ball-type linear drive and input shafts has a particularly high degree of automation.
 

„Um unsere Komponenten zu fertigen, brauchen wir fast das gesamte Werkzeugportfolio, das der Markt hergibt“, berichtet Heiko S., Leiter Werkzeugmanagement bei thyssenkrupp Presta Schönebeck GmbH. Rund 4.500 verschiedene Werkzeuge kommen insgesamt zum Einsatz, etwa die Hälfte davon sind Schneidwerkzeuge. Schon heute ist es eine Herausforderung, den Überblick über die in der Produktion eingesetzten Werkzeuge zu behalten. Mit der geplanten Steigerung der Produktionszahlen, nicht zuletzt für einen neuen Großkunden im Bereich der Elektromobilität, ist die Anschaffung von 48 neuen Maschinen geplant. So kommen noch weitere Werkzeuge in die Fertigung.

Weil der Verwaltungsaufwand für das manuelle Tracking der Werkzeuge extrem hoch und fehleranfällig war, suchte das Unternehmen für das hauseigene Toolmanagement nach spezialisierter Unterstützung beim Datenmanagement. Der Vergleich verschiedener Systeme hatte ergeben, dass die wenigsten Anbieter das große Portfolio von thyssenkrupp Presta Schönebeck an verschiedenen Werkzeugen abdecken können. Vor fast zwei Jahren wurde das Lifecycle Management von c-Com als Pilotprojekt eingeführt, um in einem ersten Schritt die in der Fertigung eingesetzten Wälzfräser nachzuverfolgen und eine Reichweitenbetrachtung vorzunehmen. „Das Lifecycle Management bietet eine zentrale Plattform zur Orchestrierung der Werkzeugprozesse über Unternehmensgrenzen hinweg“, erläutert Markus Deininger, Project Manager bei c-Com. „Mit Hilfe des digitalen Zwillings werden alle relevanten Werkzeug- und Prozessdaten für alle autorisierten Prozessbeteiligten zugänglich gemacht und kontinuierlich aktualisiert. Hierdurch gewährleisten wir eine umfangreiche und lückenlose Fortschreibung der Werkzeugdaten, und der Kunde erhält jederzeit einen detaillierten und aktuellen Überblick über seine Bestände.“ Ein wichtiger Aspekt bei der Entscheidungsfindung bei thyssenkrupp Presta Schönebeck war darüber hinaus die Möglichkeit, die c-Com Plattform um weitere Produkte, wie das Digital Tool Management, zu erweitern. 
 

c-Com improved this significantly. Hobbing tools are so-called serialised tool. Deininger explains what this means: “A serialised tool is uniquely identifiable due to the material number assigned only to it. Through the serialisation, we can attach all technical data to the tool’s digital twin in our platform. You thus know the tool’s condition and exactly where it is. This is useful for key tools that are very important for the process chain.”

Heiko S. can now follow every single tool in Lifecycle Management and sees how much longer the worker can use it, when it has to be reground and when the hob has to be reordered. The Tool Assistant app makes it easy for the employees to assign a tool to a specific task. When the tool is no longer fit for production, the employee removes it from the system. The condition has to be selected and recorded – i.e., was the tool removed because it was broken or worn out? Only very few entries must be made in the app for this. The tool is then automatically prepared for shipment to be reground.
 

The regrinding partner also has access to c-Com and the pertinent information, so they know which tool to expect and how many parts it has machined. Upon return delivery, a note is made as to what tooth length has been ground and how often the tool can still be used. Many parts of the system are automated to provide the customer with the best data quality possible.

Jana S. is an employee in the big tool warehouse and works with c-Com every day to book goods movements internally as well as for external suppliers. She enters the tools in the system and gathers all the relevant data. Shipment for regrinding used to entail handwritten lists with 20 to 30 items. Nowadays, the job is done with a few mouse clicks. She used to have to search the factory for tools, so she really appreciates the tracking capabilities: “It’s a big relief to know where every single hobbing tool is now.”
 

Based on target figures for parts to be produced, the Tool Planning module presents information about how long required tool will last, taking all the possible regrinding processes into account. This inventory range analysis is meant to prevent bottlenecks even when production is ramped up. Tool Planning is a big help for Heiko S.: “I can now find all the information I need for my job at a glance. Red bars show me areas I have to examine because there could be a disparity between inventory and need for the products we are manufacturing.” The dashboard also shows the tool costs and consumption on particular machines.

The pilot project with the hobbing tools was a big success for Lars B.. “The investment in c-Com has definitely paid off”, the Technical Head assures. “The warehouse was intransparent in some places. The reduction of inventory brings us enormous benefits because storage costs are ultimately losses.”

In the next step, c-Com is to be employed for the non-serialised tools. The company is unable to allocate them to particular machining operations for the simple reason that worn-out indexable inserts and drills are often just thrown out without recording their tool life. Whenever a tool is checked out in c-Com, a record is made regarding the machine and part the tool is used for. It is also possible to see in retrospect how many parts the tool produced. When procuring new machines, thyssenkrupp Presta Schönebeck wants to ensure that they already have the software to exchange information with c-Com via an interface.