Machining at any Angle Position

The TRAUB TNL32 series of sliding/fixed headstock automatic lathes has been extended by a model with an additional B-axis. The TRAUB TNL32-7B (model with seven linear axes) opens up new possibilities to the user.

TRAUB TNL32

The TRAUB TNL32 sliding/fixed automatic lathe series, which established itself on the market in a very short time, already captivates customers due to its extremely user-friendly and diverse equipping options. The TNL32P has a clearly structured and generous work area. The base model with 5 linear axes is ideally tailored to production requirements mechanically and with regard to control engineering. The TNL32-7 with seven linear axes and the TNL32-9 with nine linear axes are among the higher-end models.

The TNL32-7 model now includes an extra B-axis, thus expanding its application spectrum to handle particularly challenging machining tasks. With the additional B-axis in the upper tool carrier, which can pivot by 100°, highly complex parts and complicated contour elements can be machined that also require additional operations such as milling, drilling, lateral drilling or transversal threading at any preferred angular position.

Practical user benefits: Advantages come in fours

Interaction of systems: main spindle, upper turret in B-axis swiveled, back working attachment and counter spindle with integrated lower turret

Interaction of systems: main spindle, upper turret in B-axis swiveled, back working attachment and counter spindle with integrated lower turret

The bottom line is that the following advantages result for the user in terms of set-up time and cost optimization:

  • Set-up time optimization: Setting up angle-adjustable tool holders is no longer necessary.
  • Cost reduction: Expensive angle-adjustable and 90° angled tool holders are omitted
  • Higher workpiece quality: The omission of angle-adjustable and angled tool holders creates more stable machining conditions in the machine system.
  • Complexity gains: Due to additional operations in any angle positions, highly complex workpieces can be produced more flexibly and efficiently.

Simple change-over between fixed and sliding headstock turning

It takes just a few steps for all variants of the TNL32 series to convert the lathe with sliding headstock to fixed headstock turning mode and vice versa. The extremely long Z-axis travel of the headstock ensures proper positioning of the main spindle, either for sliding headstock turning or fixed headstock turning.

Generous work area with innovative inner values

An example of the machining option for the B-axis: cutting on the counter spindle

An example of the machining option for the B-axis: cutting on the counter spindle

The most noticeable feature of the TNL32 series is the considerably enlarged, generous, and user-friendly work area. The TNL32 has a ten-station turret. Turret indexing is performed using an NC rotary axis that controls movement via an internally meshing planetary gear. This allows the turret to be indexed to any preferred position without a mechanical locking mechanism being necessary. The free positioning of the turret makes multiple-tool assignment possible on each station so that the top tool carrier can be equipped with up to 30 tools. Since mechanical locking is no longer necessary, chip-to-chip times of 0.3 sec are realized.

A further innovative highlight is the “Dual Drive” –​two built-in turret drives. This smart and patented drive solution with two separate drivetrains in one turret reduces the auxiliary processing times and also keeps the cycle times to a minimum. The ingeniously simple idea: While one tool is in use, the tool intended for the next work step can be accelerated up to the desired speed during main time and is immediately available at full speed after the turret indexing operation. Jerky accelerations and delays that were previously unavoidable when reducing auxiliary processing times are now a thing of the past.

In addition, the user benefits specifically from the fact that tool holder wear is drastically reduced due to the low acceleration values. The chip-to-chip times in the case of live tools are under 0.3 seconds.

Improved tool mountings

The tool holder product line is completely compatible with the TNL18 series, only the drive wheels in the live tool holders have are replaced if needed. Both variants make use of the new TRAUB compact shank system: an improved system for high-precision 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 allows for the installation of roller bearings with large diameters. A quick-change system enables high-precision, smooth exchange of tools without removing the tool holder. The compact shank system verifiably increases the tool life and also contributes to improved surface quality.

For complete and complex machining operations

Simultaneous machining with three tools

Simultaneous machining with three tools

Simultaneous machining with multiple tools ensures high productivity levels with the machines. In this process, up to three tools are used simultaneously on two spindles. The TNL32P production machine differs from the TNL32 variant in that the Y-axis motion of the upper turret is affected by interpolation of the X/C/H axes. This allows of course milling contours to be created by entering values in the standard Cartesian X/Y/Z coordinate system. Reliable off-center, parallel axial 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. In this counter spindle version, the machine has always been equipped with a durable back working attachment. It accommodates 8 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). Another innovation is the refined drive scheme for the utilized tool holders that deliver 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.

Alternatively, the TNL32 can now be provided with an autonomous counter spindle. An X/Z cross-slide provides a counter spindle with identical performance to that of the main spindle. In this model, workpieces with a length of up to 700 mm and a diameter of 30 mm can be discharged through the counter spindle.

Tried-and-tested control family

The TNL32 is equipped with the TRAUB TX8i-s control and the TX8i-p for the TNL32P. Both controls are based on the CNC control from a worldwide leading control manufacturer while the user interface software – like all models developed in the last 30 years – is a one hundred percent TRAUB development.

The advantage is obvious: Customers need not rely on standardized software products; rather customer and application needs can be implemented and integrated optimally into the development.

Of course, the control is compatible with all previous TRAUB controls so that existing programs can be used.

Features that speak in favor of the control:

  • Reduced set-up time due to higher NC performance
  • Two-way programming, optimization and simulation in interactive or in NC mode possible, (TX8i-s integrated, TX8i-p via external CNC client application)
  • Error avoidance and setup time reduction through object-oriented interactive guidance
  • Sensitive tool break and wear monitoring
  • Compatible with all previous TRAUB controls
  • High availability
  • Optimal support because the machine, control and drive are from a single source
Parts spectrum of the TNL32-7B

Parts spectrum of the TNL32-7B

Small footprint and easy access

The vertical machine bed design results not only in 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 chamber is easily accessed by the user through its noticeably high and wide sliding door. This provides a lot of room for equipping and re-equipping 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 to the rear of the machine and can be easily checked at a glance.

Target group of the new TNL327B sliding/fixed automatic lathe with seven linear axes, ten-station turret, Dual Drive and additional B-axis includes the entire machine manufacturing industry, from the hydraulics industry to medical technology. It plays on its strengths especially where small, geometric and highly complex parts are machined using a maximum bar clearance of 32 mm.

 Source INDEX-Werke GmbH & Co. KG