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In Focus - Archive September 2009
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Hydraulic expansion toolholders are considered to be the benchmark for high-precise tool clamping
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Hydraulic expansion toolholders are considered to be the benchmark for high-precise tool clamping
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09-01-2009 -
Hydraulic expansion toolholders for tool clamping (milling cutter, drills, taps and reamers) are known on the market for a long time and are appreciated for their technical advantages. They combine powerful, centric clamping with a high internal dampening. The result is an excellent surface at high machining speeds.
When talking about expansion technology, most think of a TENDO hydraulic expansion toolholder that is used for clamping shank tools.
Even though it is not widely known, workpiece clamping has been around for quite some time and plays an important role in the hydraulic expansion clamping technology. The function principle remains the same; the internal oil pressure deforms the expansion sleeve, which is used for clamping the workpiece in a bore.
The oil pressure can be generated manually by turning a screw, but also automatic clamping is possible by using a hydraulic pump.
Advantages of hydraulic clamping
The hydraulic expansion toolholders center the workpieces automatically to the middle of the axis - manual adjustment and redundant controls are no longer necessary. Every workpiece is clamped with the same pressure and the surfaces are treated with care. Workpiece changing times are reduced, as well as auxiliary process times leading to machine tools becoming more productive.
Manifold fields of application
Hydraulic expansion tools have been successfully used in milling, turning and controlling. However, they are branching out into other fields of application, such as gear grinding, because its advantages quickly amortize the higher cost.
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Hydraulic expansion toolholders with axial pullback from SCHUNK assure maximum accuracy and allow fast workpiece changes at minimum set-up times.
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The future trend is the axial pullback
Further research into the hydraulic expansion tools helped develop an axial pullback.
The previous clamping elements produce excellent centering results. The new ones with the axial pullback even assure a save stop at the axial run-out.
Technically the axial pullback is resolved as follows: The hydraulic expansion toolholder is controlled via the hydraulic pump of the tooling machine. A pressure intensifier, which is integrated into the arbor, increases the input pressure and conducts it into the expansion sleeve. It is designed in a way that pressure actuation causes a radial expanding first and then a contraction in length, the axial pullback. Now the workpiece contacts the face.
Conclusion
The hydraulic tool clamping increasingly finds its way into a wide range of general applications. The demand for this kind of clamping technology increases steadily. SCHUNK, one of the co-founder of this technology, offers not only standard solutions but also high-quality workpiece-specific clamping elements.
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2009-10
How Machines Can Learn To See
More and more industries tap the full potential of machine vision systems. Whether in the supermarket, on the highway, at the airport, or in the factory; pictures are being taken by a camera system and are evaluated with a computer, in order to make a fully-automatic, quick and safe decision.
 more...
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2009-09
Hydraulic expansion technology for workpiece clamping
Hydraulic expansion toolholders for tool clamping (milling cutter, drills, taps and reamers) are known on the market for a long time and are appreciated for their technical advantages. They combine powerful, centric clamping with a high internal dampening. The result is an excellent surface at high machining speeds.
more...
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2009-08
Gripping - checking - measuring - preventing from damage
Intelligent sensors transform actuators to sensitive helpers in automation
Sensors used in automation are essential organs of machines and plants. While gripping modules and other actuators performed pre-defined tasks in the past, today, they are intelligent and flexible helpers in the manufacturing process due to the use of intelligent sensors. They provide the plant with important information on the process, products or components as well as plant functions. This increases flexibility, shortens manufacturing time, ensures product quality, avoids plant failures, and prevents the automation systems from damage.
more...
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2009-07
The trend towards precision toolholders
For many years, collet chucks have been popular because of their low pricing and have been the established toolholders for many machining applications. Unfortunately, the same scenario happens in many companies: Because of worry over loose tools, many machine operators are tightening the coolant tube nut of the collet mountings with oversized extensions.
more...
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2009-06
Always up-to-date with the standards - The new machinery directive in the EC
The safety of products and systems traditionally tops the priority list at SCHUNK. Since we want to partner with our customers, we are exclusively offering top-of-the-line products in quality and safety.
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2009-05
Highly economical due to performance in toolholding and workholding
5-axis machines offer an enormous potential for efficiency in modern production. With sturdy machine kinematics, high axis accelerations, short chip-to-chip times, fast tool magazines and finely tuned controllers, you have all kinds of production power in a very small space.
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2009-04
Microvalve Technology
- Small component handling and assembly
Anyone who wants to handle or assemble small, light parts can really get a move on with electromagnetic microvalves. These energy-efficient valves are screwed directly onto the pneumatic actuator and thus eliminate the need for long wires. They make the tempo significantly faster and thus save compressed air, complicated wiring, and a lot of assembly time.
more...
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2009-03
Reliable precision for the most well-hidden corners
Regardless of their design sophistication, it is sometimes impossible to avoid cre-ating hard-to-reach points on workpieces. All of these cases require slim toolholder systems with minimized interference contours. They have to penetrate into the most well-hidden corners, transmit sufficient torque and guarantee high precision at the same time.
more...
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2009-02
The foundry sector: a red-hot key industry
With 87,000 employees and sales of around €14 billion in 2007, the foundry sector is one of German industry's smaller branches. Its economic significance is large.
more...
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In Focus - 2013
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