Hermle machining centre C 22 UP with pallet changer in tool making

Automated die machining boosts manufacturing capacity

/ins With its standardisation strategy and the C 22 UP machining centre from Hermle, the tool and mould making division of the WMF Group has managed to streamline die and tool production processes, thereby creating the scope for services for external customers.

Today, the WMF Group, which was founded in 1853 as Metallwarenfabrik Straub & Schweizer and has been part of the French SEB Group since 2016, represents the best in cooking, drinking and dining. More than 2,200 employees at the Geislingen headquarters and the nearby Hayingen plant alone are engaged in the development and production of high-quality cookware and cooking knives.

Many of these products are still manufactured through the primary and secondary forming of sheet metal blanks. The WMF Group manufactures most of the required tools in-house at its own tool shop in Geislingen. “For about 30 different knife models alone, we use between 100 and 150 die tools, each consisting of an upper and a lower tool made of hardened hot-forming steel," explains Hans Brühl, Part Production and Tooling Technician at WMF. To guarantee consistent high product quality, the mould makers have to rework the tools after roughly 3,000 strokes. This involves precisely milling and removing approximately 0.5 mm of material, a process that is possible up to fifteen times with the dies. “In the past, we performed all these milling and finishing operations on an HSC milling machine. However, this machine could only accommodate two dies at a time, which then had to be processed successively and in several time-consuming setups. As knife production in Hayingen increased, more dies were obviously needed and this led to capacity shortages,” says Brühl when explaining the situation at the time.

Demands: Best surfaces in the shortest time

An evaluation process, which included a series of tests to assess contour accuracy, precision and surface quality and to determine whether the specification of significantly reducing machining time for refinishing had been accomplished, saw the 5-axis machining centre C 22 UP from Hermle come out on top. A machining process developed together with Hermle led to some extraordinary results: Not only was the desired reproducibility of contour accuracy and surface quality achieved, the machining time was also reduced considerably. Thanks to the equipment of the C 22 UP machining centre, featuring an 11-fold PW 150 pallet changer, it is now also possible to rework the dies automatically, in other words during the night and at weekends. This means additional capacity is now available for processing internal and external orders.

Proven: Twice as fast

The fact that the WMF Group’s tool and mould making division was able to achieve new levels of productivity is due, on the one hand, to standardisation of the dies. On the other hand, a self-developed pallet and workpiece clamping system with 4-fold bolting directly to the pallet and the automation provided by the PW 150 pallet changer have allowed machining to become significantly more efficient. Axel Spadinger, Head of Tool Engineering & Making at WMF Group GmbH, says in summary: “We were able to reduce the machining time by 50 percent and more when refinishing the dies. Since this work is generally carried out at night and over the weekend, we can therefore use the C 22 UP machining centre very flexibly during the day for all other machining operations. Combined with our know-how in tool and mould making, we are thus in a position to meet external customer needs on time.”

Description of images:

Figure 1 shows machine operator Günter Schulz in front of the Hermle C 22 UP 5-axis machining centre in the tool and mould making division of WMF Group GmbH

Figure 2 shows the PW 150 pallet changer of the C 22 UP machining centre; in the foreground is the (rotating) setup station for loading the pallets/workpiece fixtures with workpieces or for removing the finished parts

Figure 3 show a top view of the 8-fold rack storage of the 11-fold pallet changer PW 150 with eight pallets in rack storage, two pallets in the changer (top right) and one pallet changer in the machine

Figure 4 shows the working area of the C 22 UP machining centre with the swivelling rotary table measuring 320 mm in diameter (axes A and C) for 5-axis complete/simultaneous machining of tool components in a single setup

Figure 5 shows a forging die (upper and lower tool), on the left without adapter plate, clamped directly onto a pallet, fixed in place with two dowel pins and clamped with four screws; and on the right as a completely machined die     

Figure 6 shows from left to right: Axel Spadinger, Head of Tool Engineering & Making, Hans Brühl, Part Production and Tooling Technician, and Günter Schulz, machine operator, all from the tool and mould making division of WMF Group GmbH in Geislingen/Steige

Figure 7 Like no other company, the WMF Group represents the best in
cooking, drinking and dining and supplies the finest kitchen utensils. The C 22 UP machining centre from Hermle is at the very heart of the metalware manufacturer’s die and tool shop.

 

MASCHINENFABRIK BERTHOLD HERMLE AG
Hermle AG is a well known company with a leading position in national and international markets. Continuous innovations have made Hermle a leading manufacturer of machining centres. More than 25000 users throughout the world trust Hermle machining centres. A close-knit sales and service network guarantees a reliable partner on-site in all important countries of the world. Hermle machines are produced in Southwestern Germany in a region which has been the home of precision mechanics and machine tools for many generations. Hermle's machining centres are used for efficient machining of tools, moulds and series-produced parts. Owing to their quality and high precision, they are used in numerous production areas, including in particular highly demanding sectors such as medical technology, machine construction, the optical industry, aviation, the automotive and car racing industries and their subcontractors.

www.hermle.de

 

Contact for enquiries:

Udo Hipp, Head of Marketing, Maschinenfabrik Berthold Hermle AG, D-78559 Gosheim, Germany

Phone: (0)7426 95 6238   E-mail: Udo.Hipp@hermle.de    Internet: www.hermle.de

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Company Information


Hermle Logo



Maschinenfabrik 
Berthold Hermle AG

Industriestrasse 8-12
78559 Gosheim / Germany
info@hermle.de
www.hermle.de

Press contact


Udo Hipp
Head of Marketing
Phone: +49 (0)7426 95 6238

Udo.Hipp@hermle.de

Via social media

Company Information


Hermle Logo



Maschinenfabrik 
Berthold Hermle AG

Industriestrasse 8-12
78559 Gosheim / Germany
info@hermle.de
www.hermle.de

Press contact


Udo Hipp
Head of Marketing
Phone: +49 (0)7426 95 6238

Udo.Hipp@hermle.de

Via social media

About Hermle

Hermle is all about milling and achieving outstanding results. And we are committed to ensuring just this with our architecture, our structure, our work, our approach, our development, our engineering, our assembly and our service. Everything we achieve, change or optimize makes our results better, more precise, available more rapidly– nothing more and nothing less.

"milling at its best" – as the slogan of Hermle AG – sums this up aptly. It stands for a high-performance, highly innovative machining centres that have risen to a leading position nationally and internationally. It stands for a sprawling and closely meshed sales and service network and the presence worldwide of more than 26,000 successfully installed machines.


Hermle C 22 UP 5-axis machining centre in use
         Machine operator Günter Schulz in front of the Hermle C 22 UP 5-axis machining centre in the tool and mould making division of WMF Group GmbH


Ultimately, it stands for the success of our customers who achieve the best results in terms of precision and efficiency using our products.

But what makes "milling at its best" possible? A constant supply of new ideas and the proverbial Hermle precision in manufacturing, process consulting and sound project management. With our approx. 1.200 highly motivated employees, who are responsible for all this, we create the foundation. And we do this in a place which has traditionally been the home of precision mechanics and machine tools. All in all, these are the best possible prerequisites. They are the reasons why we enjoy a leading position today as a partner to numerous key industries. From large complex components to the smallest components in the high-tech area. From medicine to auto racing. We lead the way!


from right to left side Friedhelm Herhaus, Managing Director, Christoph Schneider, Group Leader Milling Technology, and Tom Herhaus, Applications Engineering/Operator, all from machining service provider HETEC GmbH

From right to left side Friedhelm Herhaus, Managing Director, Christoph Schneider, Group Leader Milling Technology, and Tom Herhaus, Applications Engineering/Operator, all from machining service provider HETEC GmbH

 

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