New BFS connection for replaceable head milling systems

The functional principle of the new connection couldn’t be easier: the replaceable head only has to be inserted and turned 90 degrees to be locked. That’s a lot easier than the previous system for replaceable head milling cutters from MAPAL or comparable systems where the replaceable head is threaded and has to be screwed in several turns. 

The bayonet system achieves very high rigidity thanks to the large cylindrical face connection. While the force only acts on one side while tightening a thread due to the thread’s pitch, the new MAPAL system ensures a symmetrical insertion and good distribution of force.
 

In addition, by doing away with a central cooling channel bore, the milling head becomes much more stable. The tool holder is 10 to 15% more rigid than comparable systems, resulting in higher achievable form and position tolerances, smoother processes and longer tool life.

The solid carbide replaceable heads from MAPAL also impress thanks to their high process reliability as inserts cannot become loose at high temperatures. If tool breakage does occur, the connection’s simple assembly ensures that the machining process can be resumed quickly.

Modular tool systems with a steel-shank tool holder have also been marketed to conserve carbide. With the bayonet connection, MAPAL is going one step further. Compared to previous connection, 70% less material is used, in keeping with the trend towards more sustainability.
 

The connection is offered in 7 different sizes with head diameters from 11.8 mm to 22.5 mm and head lengths up to 1xD, which enables a variety of applications. In addition to the replaceable heads, the tool manufacturer can also custom design the tool holder to optimise the coolant supply for particular requirements, for example.

MAPAL is also exhibiting two initial applications together with the bayonet connection at the AMB. A solid carbide head with five cutting edges is being used by customers from the automotive industry as a ball nose milling cutter to manufacture homokinetic joints. The soft machining of this component, which is integrated in the power train, requires a high degree of precision. Another tool is a form cutter for machining ball joints on drive shafts.