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Grinding Center's Dual Spindles Drastically Reduce Grinding Time, Even on Small, Complex Components

EMAG's new machine concept combines fast loading with efficient grinding process, enabling plants to handle the increased production requirements in the recovering automobile industry.

Automobile manufacturers all over the world were able to enjoy an increase in their sales figures, this year. The biggest increases were experienced in the USA, China, India and Russia. However, the rapidly increasing number of vehicles built also brought some production challenges -- for instance, the sub-contractors must deal with the increasing output levels and also need to ensure that process safety and component quality do not suffer.

VLC 100 G Vertical Pick-up Grinder

 

 

In fact, even the smallest components with complex geometries must be produced with increasing levels of precision. In the development of the VLC 100 G Vertical Grinding Center, EMAG's grinding specialists have made sure that the machine concept offers efficient, error-free machining processes for the production of small chucked components.

Small chucked components are typically produced in large quantities. The demand for components, such as gearwheels, planetary gears, chain gears and flanged components for cars, for instance, have necessary quantities that typically go into the millions; and short cycle times in the production of these components have become mandatory. For instance, the internal contour of a gearwheel must be ground in the shortest possible time and the machine's workholding unit must be loaded with a new workpiece just as quickly. In many production environments, this represents a critical moment, because the idle time is commonly a decisive factor in establishing the economic viability of the whole process.

The VLC 100 G is equipped with three axes (X, Z, C). The machine uses its overhead pick-up spindle to load itself. The machining area features one or two grinding spindles for internal and/or external work.

 

 

 

 

Automatic Loading Scores Heavily

High output levels -- short cycle times. This is exactly why the VLC 100 G Vertical Grinding Center from EMAG, for small chucked components with a maximum diameter of 100 mm, was developed. The machine utilizes its onboard pick-up system to load itself. And while one workpiece is being machined, the operator -- or the automation system -- is putting the raw-parts on the conveyor belt. This reduces idle time and increases output rates. Another benefit is the vertical machining concept; the design ensures that the grinding sludge falls to the bottom of the machine unhindered, where it is then transported out of the machine.

The dressing unit with diamond roll

 

 

Quality Control is Integrated

Measuring processes can also be integrated into the machine, making quality control an integral part of the whole process. The measuring probe is located between the machining area and pick-up station, where it is protected from contamination.

Two Different Grinding Wheels

An important feature of the VLC 100 G is that it offers the possibility to use two grinding spindles, which can be used to perform different grinding operations, or to handle both rough- and finish-grinding work. In other words, the first wheel performs the "rough" job of removing excess material from the raw-part at high feedrates (the CBN wheel is specially designed to absorb the necessary forces), while the second wheel (with different specifications) takes over the finishing work to guarantee a perfect surface finish on even the most challenging geometries. With the help of this intelligent tooling combination, EMAG design engineers have succeeded in drastically reducing the grinding time of even very complex components.

Very easy access. Generously designed maintenance and service doors make the machine easy to access.

 

 

"For the removal of large amounts, two wheels offer a shorter cycle time than one, with the first wheel designed to do the rough-grinding and the second one in charge of finish-grinding work," explains Dr. Guido Hegener, Managing Director of EMAG Salach Maschinenfabrik GmbH in Germany.

A Convincing Machine Concept

The combination of fast loading and efficient grinding processes leads to a very compelling machine concept. The VLC 100 G works very well with the dynamic developments in automotive production. Now, with the rapid increase in required quantities, the demand is for new machine concepts that can be integrated into existing production without any problem. With the VLC 100 G, two features enable it to be integrated without any problems.

"Programming the workpieces with our new EMAG NAVIGATOR software is simple and intuitive, saving valuable setup time. For many production environments, this is an advantage that should not be underrated," confirms Dr. Hegener. Furthermore, the exceptionally small footprint for the VLC 100 G should make the work of every production planner easier. The stand-alone machine occupies about 4.5 square meters (48 square feet), making sure that the growth of a production facility of this kind will not be limited by floor space requirements.

The workpieces are mounted on pallets and taken into the VLC 100 G by the conveyor belt. The pick-up spindle then further automates the whole loading and unloading process.

 

 

The Advantages of the VLC 100 G

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