Milling cast and steel parts more cost-effectively

Let’s take a quick look back: MAPAL first showcased a product range for milling with compressed radial indexable inserts at the AMB exhibition in Stuttgart in 2018. “This move was the natural next step towards our aim of being a comprehensive service provider for our customers,” explains Dr Wolfgang Baumann, who is responsible for the product range of tools with ISO elements at MAPAL. “But our aim isn’t just to provide the customer with all their machining needs in terms of tools and chucks – we also want to offer them added value through our solutions,” adds Baumann. Accordingly, the development process of the new tools was comprehensive and detailed.

“Before this milling range, our focus was mainly on supporting customers with specific application needs, such as providing support for high levels of stock removal or unstable conditions,” explains Dr Baumann. This machining was mostly carried out using ground tangential indexable inserts. “We’re obviously not the first company to offer a radial milling range. We’ve simply plugged a gap in our portfolio,” admits Baumann. However, he further adds: “Through our work with special applications, we’ve accumulated extensive in-depth knowledge that has been incorporated into the development of our compressed radial blades. They therefore offer considerable added value and, in particular, economic benefits for users.”

“The success stories that we’ve gathered over the past year prove that our meticulous work
is paying off for our customers today,” explains Dr Wolfgang Baumann enthusiastically. In many applications, the cost per part (CPP) was considerably reduced. There are several reasons for this: “In many cases, other tools were superseded once we had analysed the application and selected the optimal tool,” Baumann explains. “For some applications, our tools now machine significantly more parts until the blades have to be replaced. And in some other machining operations, the same machining times per part can be achieved with fewer blades. However, there are other cases where we can achieve considerably higher cutting data with more blades. We sometimes rely on indexable inserts with more cutting edges, thanks to which each individual indexable insert can be used for considerably longer.”

By way of example, three machining operations on customer parts demonstrate the added value that the radial milling range offers.

A MAPAL Face Mill cutter with a diameter of 100 mm is used on the side with stainless steel in the turbo charger application. The tool features 9 cutting edges in contrast to the before used tool with 7 edges. The indexable inserts differ in cutting edges: MAPAL inserts feature 16 edges but the competitor features only 12. MAPAL's cutting tool achieves 50 percent more parts through a significantly higher feed rate. The cycle time goes down drastically, and due 2 MAPAL's solutions costs per part is 44 percent lower than before.

Ein Eckfräser bearbeitet verschiedene Anschlussteile eines Achsschenkels aus Gusseisen mit Kugelgraphit mit Aufmaßen zwischen 2,5 und 4,5 mm. Ein sechsschneidiger Eckfräser von MAPAL mit acht Schneidkanten pro Wendeschneidplatte ersetzt ein Wettbewerbswerkzeug mit sieben Wendeschneidplatten je vier Schneidkanten. Trotz des negativen Freiwinkels erzielt das MAPAL Werkzeug die gleiche Standzeit wie die bisher eingesetzte Lösung mit positiv ausgerichteten Wendeschneidplatten. Zwar bearbeitet der neue Fräser genauso viele Bauteile wie zuvor, allerdings sinken die Kosten pro Bauteil um mehr als die Hälfte: um 58 Prozent.

An einem Zylinderblock aus Gusseisen mit lamellarem Graphit sind verschiedene Flächen mit einem Eckfräser zu schruppen. Die Aufmaße schwanken zwischen 2 und 5 mm. Der achtschneidige Eckfräser von MAPAL ersetzt einen ebenfalls achtschneidigen Eckfräser des Wettbewerbs. Jedoch weist die MAPAL Lösung acht Schneidkanten pro Wendeschneidplatte auf, eine Verdoppelung. Bei gleichbleibenden Arbeitswerten ist die Standzeit des MAPAL Werkzeugs deutlich höher: Es bearbeitet trotz negativ ausgerichteter Wendeschneidplatten 60 statt vorher 32 Bauteile. Die Cost-per-Part sinken um 58 Prozent.