01.02.2018

Concentrated flexibility and efficiency – facing heads and mounting tools from MAPAL

Using facing heads and mounting tools, complex contours on rotationally symmetric components can be realised without the use of a lathe for stationary workpieces. This benefits end machining centres when both pipe ends have to be machined simultaneously and independently of each other. The Bühring machine manufacturer therefore decided on a CNC machining centre with a corresponding tool solution from MAPAL and since then operates significantly more flexibly and economically.

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A total of ten pipe ends are shown in the image, some of them cut. They are stacked on top of each other.
  • A total of ten pipe ends are shown in the image, some of them cut. They are stacked on top of each other.
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    For many years the machining of pipes at both ends has been one of the specialities of the machine engineering company Bühring, which acts as an extended workbench for agricultural machinery manufacturers, among others. 

  • A disc revolver can be seen. Eight positions are occupied by facing heads with mounting tools.
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    The facing heads of the machine are equipped with an HSK-A63 tool adapter. A disc revolver is integrated for the corresponding mounting tools. 

  • In detail, a single slide facing head is shown in connection with a mounting tool.
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    Two tailor-made single slide facing heads with automatic tool change, in conjunction with corresponding mounting tools, allow complex machining contours to be realised. 

  • Yellow rotors with welded-on red teeth can be seen. These provide for straw transport in the baler.
    4/5

    About a dozen different rollers and axles are required to build a round baler. This includes the rotor that is shown with welded-on teeth, which ensures optimum transport of the straw in the baler. 

  • A tractor is shown in a meadow in front of a cloudy sky with a round baler attached.
    5/5

    Bühring manufactures various components for straw balers such as these. Credit: Peter Vahlersvik 

When the new end machining centre was delivered to Maschinenbau Bühring Betriebsunternehmen GmbH, based in Dreileben, Saxony-Anhalt, three forklift trucks had to be used to their full extent: A 26 tonne, a 4 tonne and a 5 tonne lifting truck were used together to lift the around ten metre long system from the transporter and take it to its working position. “That was real precision work”, says Sven Bühring, who operated one of the forklift trucks and, together with two other family members, manages the skills of contract manufacturers in the fifth generation.

The effort and commitment paid off. The machine fitted with the latest technology has significant advantages compared with the outdated system previously used.

Simultaneous machining of both pipe ends

The new CNC machine built according to the specifications of Bühring ensures the reliable and efficient machining of pipe ends. The pipe to be machined can be between 400 and 2,500 mm long with this machine. By using tailored single slide facing heads from MAPAL with an external diameter of 380 mm and a face stroke of 55 mm, pipes with a diameter of up to 275 mm can be manufactured with complex inner and outer contours.
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  • The single-slide facing heads:
  • External diameter of 380 mm
  • Face stroke of 55 mm
Facing heads are predominantly used on special machines when it is necessary to machine special contours. The precisely ground guiding tracks ensure the highest positioning accuracy. For machining at Bühring, MAPAL designed a facing head as a single slide with automatic tool change and with concealed imbalance compensation slides. As a result of this balance, particularly dynamic and precise machining is guaranteed.

Other features of the facing head:
  • Central oil lubrication
  • Internal coolant supply 
  • Barrier air at the HSK connection which is used to automatically hold the mounting tools
The barrier air keeps the HSK connection free of impurities. With this, the facing head fulfils all the functions of a front edge of spindle. Using the facing head, machining with a stationary workpiece and in one clamping setup can take place on both ends simultaneously and independently of each other.
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“Along with high process reliability, one of biggest advantages of the new system that showed effect immediately is the significantly faster component
change”, explains Bühring. “Refitting on the system previously used took around 2.5 hours. We now require around half the time. This is noticeable as we generally change the product at least once a week.”
 

Automated tool change using HSK-A63 connection

MAPAL provides a suitable machining process

Kontakt

Andreas Enzenbach Pressesprecher und Leitung Marketing Andreas.Enzenbach@mapal.com Tel.: +49 7361 585 3683

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