The TRAUB TNL18P and TNL18 are a trendsetting conception of a sliding headstock automatic lathes. During the development process the focus was on innovative technology and comprehensive machining options as well as a variant with a very attractive price/performance ratio. The TNL18P variant delivers maximum productivity. It is optimally tailored to customers’ production requirements, both in terms of the mechanical system and control technology. The enhanced TNL18 automatic lathe is equipped with a few more features than the P variant.
Innovative technology at an attractive price – this was the premise behind the newly developed TRAUB TNL18P sliding headstock automatic lathe (P = production machine). The production lathe is based on a more fully equipped TNL18 and features a clearly-structured and ample working area. A specific developed turret/spindle concept opens up extensive machining options, including for barstock up to 20 mm in diameter (18 mm for the TNL18). The highlights of the two models are the tool carriers in which the rotating motion is implemented as an NC rotary axis without mechanical interlock, thus allowing the angular positioning of the turret to be freely configured.
Impressive is the handling of the tool flight circles, which at 1225 mm correspond to the Y-travel of a linear tool carrier. All turret stations can be equipped with fixed or live tool holders. The pool of tools in the machine can be increased to as many as 54 tool places through dual- and multi-tool holders. Clear advantage: the operator does not have to do much changeover, thus extending productive times. The high-precision, fast turret indexing enables a very fast chip-to-chip time of 0.3 s, which is absolutely comparable to that of a linear tool carrier.
Simple changeover of the guide bush
With a few manipulations, the lathe can be used with and without a guide bush for long or short parts. The extremely long Z-travel distance of the headstock ensures the proper positioning of the main spindle, either for turning with a guide bush or without. In the standard design, the powerful main spindle is equipped with a C-axis and provided with either a direct drive with high dynamic response or a belt drive (TNL18P). It delivers high torques in order to achieve large cutting volumes.
For complete and complex machining operations
Simultaneous machining with multiple tools ensures high productivity levels with both machines. In this process, up to three tools are used simultaneously on two spindles. The TNL18P production machine differs from the TNL18 variant in that the Y-axis motion of the upper turret is mapped by interpolation of the X/C/H axes. This allows milling contours to be created by entering values in the standard Cartesian X/Y/Z coordinate system. Reliable off-center, axially parallel drilling is thus also possible using this method. A powerful, swiveling counter spindle is fitted onto an X/Y/Z cross-slide that simultaneously also carries the lower tool turret. This slide is characterized by large axis travel distances. The travel for three-axis rear end machining, even for geometrically complex workpieces, can be freely configured.
Ingenious rear end machining
Both the TNL18 and the TNL18P feature the extremely solid rear end machining unit that is typical on TRAUB machines. It accommodates 7 tool holders of which three can be live. A total of 4 stations are provided with an internal coolant supply. Each station can be controlled individually so that cutting oil is supplied selectively. The large travel distances of the counter spindles enable stations to be occupied by more than one tool (e.g., dual drill holder). The refined drive scheme for the utilized tool holders delivers either high speeds or high torques. The integrated workpiece removal allows the workpiece to be rinsed out or, optionally, picked up and deposited for positioning purposes.
The control version for the P variant
The control, tailored to a TRAUB TNL18P (P = production machine), combines high performance and a high degree of reliability. The most striking feature of the TX8i-p (p = production) is the new operator panel. Data are displayed on a 10.4-inch LCD display and are entered directly via an integrated keyboard instead of a fold-out industrial keyboard. A 64-bit Risc processor and additional PLC high-performance processor provide very fast data processing and support extremely short production times per piece. The programming scope was selectively reduced in line with the requirements for a production machine. However, virtually all programming features of the familiar proven TX8i-s version (of TNL18) are available optionally. For example, the proprietary WINFlexIPSPlus programming system is made available directly to the machine by means of an Ethernet interface to an external PC/laptop. With respect to basic configuration and programming, given identical kinematics the production control is fully compatible with the TX8i series – there is no need to develop new expertise about the control. A philosophy that represents a tradition at TRAUB: since market introduction of the basic version TX8 almost 30 years ago, the principle of user-friendly upward compatibility, along with continuous performance improvements, has been maintained consistently.
Small footprint and easy access
The vertical machine bed design results in not only a favorable chip flow but also an extremely compact footprint. This is also made possible by integrating the control cabinet in the upper part of the machine. This enables space-saving integration of the automatic lathe into existing machine groups. The working area is easily accessed by the user through its noticeably high and wide sliding door. This provides a lot of room for setup and changeover activities. A generously dimensioned inspection window allows the operator to keep a close eye on the machining process. Another plus: for servicing, only a few manipulations are needed to remove the back cover to allow full access to the mechanical assemblies. The hydraulic and pneumatic components are also arranged with full accessibility at the rear of the machine and can be easily surveyed at a glance.
Improved tool mountings
Both variants use the TRAUB compact shaft system—an enhanced system for highly accurate mounting of tool holders in the turret. The tool holders are seated deeper in the turret, which results in less leverage effect and, thus, higher stiffness. For live tool holders, the large shaft diameter enables insertion of roller bearings with large diameters. A quick-change system enables high-precision, smooth exchange of tools without removing the tool holder. The compact shaft system verifiably increases the tool life and also contributes to improved surface quality.
Double tailored in terms of equipment and price
With the sliding headstock automatic lathe TNL18 and its variant, the TNL18P production machine, TRAUB offers two powerful and versatile machines. The P variant caters especially to customers looking for the optimum in price and technology without giving up the familiar comprehensive machining options for maximum productivity.
Source INDEX-Werke GmbH & Co. KG