Zimmermann's 5-Axis Milling Machines Feature Improved Thermo-Symmetrical Design for Better Heavy Machining
With the FZU/FZP42 machine line, Zimmermann Inc. offers users efficient 5-axis portal milling machines for heavy workpiece machining.
The specific aspect of these improved machines is a thermo-symmetrical design, incorporating a centrally-guided Z-slide. This particular construction, as well as the guide layout, increases machine stability, while also saving weight -- resulting in a more dynamic, productive and energy-efficient machine.
"We have developed suitable machine designs for light processing, such as composite materials or aluminum used in aerospace, as well as for highly dynamic heavy machining," reports Cornelius Kiesel, president at Zimmermann Inc. in Detroit, the U.S. operation of F. Zimmermann in Germany.
While further developing its machine portfolio in the last several months, heavy machining for automotive, other transportation and off-highway are gaining an even higher priority in the company's market targets.
At the same time, Zimmermann is on the cutting-edge in its traditional segments, explains Frieder Gaenzle, CEO of F. Zimmermann. "We are focusing less on classic heavy machining, using large tools and high material removal rates per cut. Instead, the FZU/FZP42 model range provides tool and mold makers with a 5-axis system for highly complex components, which enables more dynamic milling of free-form surfaces."
Dynamic heavy machining is precisely the challenge in this new market segment. Because the more difficult it is to process the materials, the higher the requirements for rigidity in the machine, Kiesel further notes. Weighing in at several tons on average, the machines are quite massive. How can this massive design deliver great dynamics, so that users can work even more productively?
"Our machines mill out contours with a maximum speed of 60 m/min and may accelerate with 3 m/s2, if needed. "This resembles a motorcyclist, accelerating in a curve to run it more dynamically," says Kiesel.
Despite the acceleration, the machines must be able achieve very high accuracy as well as high-quality surfaces. "This connection of dynamics and heavy machining may be compared to a truck, loaded with stones, performing in a Formula 1 race," Kiesel muses.
Thermo-Symmetry for More Precision
In order to achieve this result, Zimmermann is setting up its complete machine portfolio thermo(load)-symmetrically. This occurs because changing ambient temperatures, as well as processing temperatures, inevitably influence machine geometry featuring a portal design.
VIDEO: Zimmermann FZ42-100 DUO
The idea behind a thermo-symmetrical design is based on the ability to substantially absorb incurring thermal influences, achieved by the design of the machine structure itself. Considering this factor, Zimmermann engineering has appropriately designed and intelligently arranged the machine structure and drive unit components and guides, as well as other components responsible for accuracy, for all machines in this newly developed portfolio. In this way, the machine structure may expand in directions that are non-critical.
The centrally guided Z-slide of the portal in double-bridge construction has a large cross-section which makes it especially stable. Using this design, Zimmermann achieves a very high degree of rigidity. Since there is no possible one-sided temperature rise, accuracy is greatly increased, as well.
With this structural design, the machine manufacturer constructively reduces the effects of error-inducing variables to a minimum. Due to the fact that less leverage forces apply in comparison to a serial design with a classic guide layout, Zimmermann has increased rigidity of the FZU/FZP, without having to increase the cross- sections of the components. Because less mass needs to be moved, the machine works faster and more dynamically.
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