成功故事

单次装夹完成叶盘轮毂的整体加工

NB 151 问世后,斯达拉格叶盘加工系列得以更加完善

在一次装夹中快速、可靠地加工叶盘和叶轮,可以达到省时又经济的目的。斯达拉格五轴联动叶盘加工中心 NB 151 专门为此类加工工艺而设计,航空航天和能源领域的用户可以从这些优势中获益匪浅。
 

斯达拉格 NB 系列 5 轴联动加工中心,尤其适合钛合金、高温合金以及不锈钢叶轮、叶盘的加工。在 2019 年初,斯达拉格发布了 NB 351 和 NB 251 的小尺寸机型NB 151,可以加工直径达 600 毫米、长度达 290 毫米、重量达 300 公斤的工件。
 

斯达拉格 NB 151 的用户将获益于其更短的加工节拍,更低的刀具成本以及低废品率。NB 151 与 NB 系列中其他大型的 5 轴联动加工中心一样,能够实现与叶盘叶轮加工相关的所有工艺,包括从毛坯的高效粗加工到线性摩擦焊叶盘的自适应加工,以及叶片型面的高动态精加工。
 

机床的基本设计借鉴了久经考验的海科特小型卧式加工中心和斯达拉格 LX 051 叶片加工中心,是实现高效加工的有力保证。矿物铸件床身具有极佳的减振性能和超高刚性,同时紧凑型的设计以及主轴和夹具的智能定位功能大幅提高了进刀能力。斯达拉格的高质量电主轴也确保了高去除率。

Its rigidity and excellent damping properties allow higher cutting values while also reducing tool wear.

Special circular axes — developed by Starrag
and produced in Switzerland

The two circular axes are certainly among the highlights of the Starrag NB 151; specially developed for blisk machining at the Starrag site in Rorschacherberg, they are 100% made in Switzerland. Without compromise, the axes have been optimised for performance in multi-blade applications, as their layout has been carefully designed to reduce compensating movements of the linear axes to a minimum.

One key factor for successful blisk machining is being able to easily access the component; in the NB 151, this is ensured by the wide 280-degree angle of the B axis, as well as the incredibly compact A axis. The machine's optimised obstacle contour both prevents collisions with the spindle and allows the use of shorter tools. The resulting cutting stability ensures the shortest possible roughing times and perfect surfaces after smoothing.

axis

Processing solutions from Starrag

Along with supplying high-quality machinery, Starrag has also become synonymous with providing customers with end-to-end machining solutions for their components. The NB 151 is no exception. This blisk machining centre fits seamlessly into the overall package offered by Starrag, which covers the entire process chain from programming and technology to software, tools and machinery. Head of Development Dr Markus Ess explains: "With the NB 151, we can provide a service package tailored to blisk and impeller machining that will impress customers with its unrivalled overall performance." 

spindle

NB 151

The NB 151 offers customers the chance to improve several aspects of their manufacturing processes, such as productivity. Its rigidity and excellent damping properties allow higher cutting values while also reducing tool wear. The high dynamics of the machine, resulting from features including a low number of moving masses, also contribute to minimised processing times,
while integrated sensors and systems improve process reliability. Markus Ess explains: "Various elements of the machine, for example the spindle, are continuously monitored for vibration, deformation and temperature fluctuations. Corresponding automated compensation processes then ensure machine accuracy".

As standard, each Starrag NB 151 is also equipped with a measurement fixture which, in conjunction with special Starrag software, allows the blisks to be machined adaptively. This feature automatically measures every single turbine blade on the unmachined part and creates a tailored blade geometry before generating the relevant NC program and executing it on the machine. This ensures perfect transfers between friction-welded blades and the rotor.

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