Screwing and threading machines

The new LWN 160 HP (High Precision) hard whirling machine is a groundbreaking innovation for the production of threaded spindles. With its capability for external machining of workpieces up to 6,000 mm in length, it sets new standards in the industry. Compared to modern grinding machines, it increases productivity by a factor of three without compromising on processing quality.

Some of the outstanding features of the LWN 160 HP are its exceptional pitch accuracy and dimensional stability. Even with fine threads, the pitch accuracy is only an astonishing 1 μm, which guarantees the highest precision. The dimensional accuracy of the cylindricity in the thread diameter is an impressive less than 3 μm, which enables compliance with the strictest tolerances.

In addition, the machine achieves a remarkably low roughness depth Ra of less than 0.2 μm in the hard whirling process, resulting in the smoothest surfaces. This first-class surface quality is of crucial importance for applications where friction and wear must be minimized.

The LWN 160 HP impresses not only with its technical specifications, but also with its adaptability and user-friendliness. It offers a variety of functions and setting options to meet the individual requirements of a wide range of applications. Its robust design and state-of-the-art control technology ensure reliable and efficient processing, even for demanding tasks.

Overall, the LWN 160 HP sets new standards in terms of precision, productivity and quality in the manufacture of threaded spindles and offers a reliable solution for companies that place the highest demands on their machining centers. Translated with DeepL

The Leistritz LWN 90 S whirling machine was specially developed for machining ball screws with an external diameter of approx. 3 to 28 mm and a spindle length of up to 300 mm. This machine combines the concentrated know-how from many years of experience in the field of thread whirling and was designed taking into account the latest technical findings.

Particular attention was paid to production-oriented and ergonomic features in order to ensure increased productivity and precision. The integration of the AWS 90-S external whirling unit extends the machine's range of applications and enables versatile processing of a wide variety of workpieces. Translated with DeepL

LWN 100: Perfect for manufacturing EPS screws At this year‘s EMO, Leistritz Produktionstechnik GmbH will present a machine novelty from its successful LWN series, amongst others. Hannover (June 21, 2017) – At the industry’s key event – the EMO 2017 in Hannover – German?based Leistritz Produktionstechnik GmbH will introduce the LWN 100, a new machine specifically for whirling EPS screws. “With this machine we meet the high requirements of the automotive industry,“ says Klaus Theusner, Managing Director at Leistritz Produktionstechnik GmbH. “The degree of efficiency and quietness play a very important role in steering technology. They can only be achieved through highest profile accuracy and finish quality of EPS screws.“ LWN 100 advantages The greatest asset of the new and compact LWN 100 is its ability to whirl ready?to?install EPS screws. It achieves very high finish quality which optimally satisfies the latest steering generation’s demands in terms of torque and noise characteristics. The whirling is a dry machining process. Not only does it bring enormous cost savings for the purchase and disposal of coolants and cutting fluids. Additionally, it is eco?friendly and keeps the working environment clean. The combination of a new digital control unit, a dynamic drive and a compact machine design results in shorter cycle times. Thus, work pieces can be manufactured even more costeffectively. The new, high?precision Leistritz whirling machine is therefore particularly adjusted to the high demands of series production, which in addition to a very good quality require flexibility and economic processing times. “The LWN 100 even stands out when it comes to Industry 4.0 features“, says Theusner. “By using so?called Smart Software Tools, the machine can easily be operated and integrated.“

Innovation at the EMO: complete machining of nuts Designed for the production of complex recirculating ball nuts and other internal threads, Leistritz is presenting a new machine at the EMO which performs complete machining and surpasses standard methods such as hard turning or grinding when it comes to precision and productivity. The combination of a CNC-controlled internal whirling process with an integrated hard turning method ensures considerably greater productivity during the complete machining of nuts with functional surfaces, as Leistritz will demonstrate at the EMO with the aid of challenging components which were produced on the new LWN 120 IW. This is made possible thanks to a precision-ground carbide plate which already contains the complete profile. As a result, a reproducible profile quality can be achieved, which would otherwise only be possible with a complex grinding process. The key advantage is that as the profile plate is only moved into the workpiece once per thread turn during internal whirling, productivity is also raised by a factor of 3 compared to turning or grinding. To be specific, the whirling tool with the profile plate moves across the entire workpiece with a maximum length of 800 mm and a diameter of 12 to 200 mm. The high-precision profiling takes place from the workpiece to the oscillator. To generate the cutting speed, the workpiece rotates around the tool at up to 150 rpm. The spindle of the tool itself rotates at 5 to 2,400 rpm and in doing so, oscillates linearly in parallel, so that the profiled cutting plate is always perpendicular to the thread profile. The cutting depth is set via the CNC control system through the machine’s X-axis. In this way, the entire internal profile can be created in a single pass from back to front. With a Z-axis travel path of 1,100 mm in the horizontal direction and an X-axis stroke of 182 mm, the majority of internal profiles can be created on the new internal whirling machine: in addition to all conceivable thread geometries, ball screw nuts with a lead of 40 mm and a diameter of 40 mm, or a lead of 80 mm with a 40 mm diameter, can be fully machined with the highest geometrical quality in a single production step. In order to completely machine the functional surfaces, the LWN 120 IW also facilitates turning including the machining of plane surfaces, i.e., the face ends of the nuts. The unique geometry of the ground profile plate actually enables a 100% check to be performed, even if only random checks are made. The new machine for hard whirling of internal profiles also offers a further decisive advantage: it is highly flexible thanks to short set-up and tool changeover times. This also makes the LWN 120 IW a highly interesting option for small batch sizes. Thanks to the dry cutting, there are no costs for cooling lubricants and the short chips can be disposed of inexpensively. To meet customer-specific requirements, Leistritz also offers a modern modular system.