The new SRINT 50 from DMG / MORI SEIKI now with different modular expansion options, from the 2-turret version with TWIN concept through to automatic lathes with 3 turrets and B-axis for production.
Firstly: the brand name SPRINT in the DMG / MORI SEIKI portfolio will continue to be synonymous with premium-class high-speed automatic turning. But secondly: the only thing the new machine has in common with its predecessor series is its name. Because the SPRINT 50 has been radically re-designed as a platform concept. So it now offers the perfect basis for different expansion options – starting with the twin turret version with up to two Y-axes and on through to a model with three turrets and a B-axis. In other words DMG / MORI SEIKI promise an enormous plus in efficiency and flexibility in every possible area of application. This is true in particular for the 2-turret version thanks to the integrated TWIN concept and due to the (patented) cross traversable counter-spindle/tailstock combination.
Up to now DMG / MORI SEIKI turret machines for production and automatic turning have been divided into different series with three tool holders in the case of the former SPRINT series or rather two turrets in the TWIN models. The new SPRINT generation will remove these boundaries and therefore replace both predecessor series in the respective design size and will itself cover all requirements of both production turning (chuck-held or from the bar) as well as automatic turning (only from the bar) at an even higher level.
This exceptional diversity derives from a modular high-tech building block concept which allows the new SPRINT series to be tailored individually to meet the needs and requirements of the customer. In addition to the SPRINT 50 with its two turrets and up to two Y-axes there is now also a three-turret version available with up to three corresponding Y-axes. Another version with an integrated B-axis in the bottom turret will also be available as of autumn. And all preparations are already in the pipeline for a 65 version.
The general field of action of the SPRINT 50 is 6-sided complete machining of workpieces up to 51 mm in diameter with a speed of 7,000 rpm on both the main and the counter spindles. The choice of working either with a chuck or from the bar in this range is in last instance up to the user: However, generally speaking the 2-turret version will probably be used more for “either or” and the 3-turret model more for bar material in everyday machining processes.
What you first notice where concept is concerned is its space-saving design with a 37 % smaller footprint. This compactness is achieved thanks to the vertical machine bed with its 3-point support that in addition ensures optimum chip flow as well as offering the best framework conditions for both wet oil machining and dry machining.
Production turning with the TWIN concept for maximum flexibility
The highlight of the different SPRINT 50 models with two tool mounts is the cross traversable counter-spindle/tailstock combination, namely the (patented 1,500-times proven) TWIN concept which increases the application possibilities enormously, as reference to the machining options of the 2-turret machine demonstrates.
Utilisation option 1
Collision-free machining with two turrets and tailstock*; 2 × 2-axis machining supported by the tailstock for long thin shafts; Y-axis for complex complete machining.
Utilisation option 2
The cross traversable counter spindle makes front-sided machining of long workpieces on main and counter spindles possible; collision-free machining with two turrets; 2 × 2-axis machining
Utilisation option 3
Collision-free 4-axis machining with two turrets and tailstock* on a single workpiece - for long narrow shafts with a workpiece length of up to 600 mm
Utilisation option 4 – 3-tool strategy (optional)
Tool 1 is set on the main spindle and tool 2 on the counter spindle (coupling operation in turret 1), while tool 3 is on the main spindle (turret 2). This enables 2 × 2 axes machining.
Automatic turning with 3 turrets and (optional) B-axis
The focus of the SPRINT 50 in the expansion options with 3 turrets, possible 3 Y-axes and additional (optional) B-axis is on their suitability for mass processing, which covers the ‘classic’ field of action of the previous SPRINT models. The generously dimensioned–2.5 ° to +182.5 ° swivel range of the B-axis also makes working at a negative angle possible.
Fast turrets for short idle times
The two, or rather three, 12 x VDI 25 turrets of the SPRINT 50, depending on the expansion stage, are equipped with driven tool stations throughout and each achieves a speed of 8,000 rpm. The fast ramp-up times and dynamic switching of the turrets resulting in chip-to-chip times of now only 0.8 seconds are also particularly worth mentioning.
Even more productivity thanks to “TRIFIX®”
Even in the standard version the 12 station turrets are equipped as a basic principle with the TRIFIX® precision tool quick change interface in all tool stations. So time-consuming adjustments inside the machine are a thing of the past. Instead the tools are positioned in the fixture during changeover via the TRIFIX® interface leading to a 35 % reduction in set up times. TRIFIX® also impresses with a repeat accuracy in the micron range and a highly stable tool holder. This guarantees maximum precision and process reliability on the one hand, even with difficult workpiece materials, and a longer service life for the tools used on the other.
Optimum work area
The benefits of the TRIFIX® effect gain additional value due to the fact that the overall ergonomics of the machine have been perfected. The work area of the SPRINT 50, for example, has been designed in such a way that the turret is now within the operator’s reach allowing him direct access. This makes setting up simple and clean work with the added plus that it can be carried out quickly and efficiently. Due to the interplay of flexibility and performance capacity in the process even medium-sized quantities can now be handled economically, where formerly only continuous runners were seen as the basis for amortisation and called for in automatic turning.
Top efficiency thanks to state-of-the-art control and programming technology
There is one thing that cannot be disputed, whether you are talking about the electrical engineering branch with its need for drive shafts and special jet components or the car industry requiring steering linkages and small crankshafts (to name just a few representative examples): as of now the SPRINT 50 will play a decisive role in all these and similar applications of automatic turning. This is also and in particular true thanks to the adapted control technology, namely the Siemens ShopTurn 3 G-control. Highlights here include up to 60 % shorter programming times due to innovative multi-channel programming, multi-channel 3D workpiece simulation and the flexibility offered by the unlimited combination of ShopTurn cycles and DIN functions.
This leads in the last instance to a 30 % reduction in set up times ensuring even more flexibility for small and medium-sized batches. The simplicity and clear structure of the integrated tool management rounds off the perfect overall image of the SPRINT 50 series just as much as the final mention of complete(!) ShopMill functionality of the ShopTurn 3 G control from Siemens.
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