Process solution for machining all types of connecting rods

By Mapal Ltd
schedule7th Sep 18

Connecting rods are highly stressed engine parts. To take account of downsizing and
the reduction of CO2 emissions, connecting rods are also becoming increasingly
lighter. This is achieved on the one hand through the use of high-strength and
innovative materials, and on the other hand through modern production processes.
This also changes the shape of the connecting rods and the variety of shapes
increases. MAPAL offers the complete process for machining different types of
connecting rods – whether on the transfer line or the machining centre as well as for
wet or MQL machining.
When machining the connecting rod, the small connecting pin bore in particular is a
challenge. Depending on the geometry, there are completely different drilling
situations. For example, for various connecting rod forms, flat, deep and conical
spherical surfaces or for existing forging noses. MAPAL has developed a modular
tool concept for drilling from the solid with indexable inserts especially for this type of
machining. Radially integrated, sintered indexable inserts each with four cutting
edges are used here.
The placement of the indexable inserts and the chip flutes are adapted to the special
requirements of the different drilling situations. The cutting materials are also
adapted. Among other things, the new CVD coating from MAPAL is used, which
combines the previously opposing high ductility and high wear resistance parameters
and thus allows machining with significantly higher cutting speeds than before.
The tool body of the new tools is made of an optimised material with significantly less
vibration. A central coolant supply in the holder ensures an optimum supply of
coolant directly at the cutting edges. This means a significant increase in process
reliability and stability during the machining of bores.

Connecting rods are highly stressed engine parts. To take account of downsizing and
the reduction of CO2 emissions, connecting rods are also becoming increasingly
lighter. This is achieved on the one hand through the use of high-strength and
innovative materials, and on the other hand through modern production processes.
This also changes the shape of the connecting rods and the variety of shapes
increases. MAPAL offers the complete process for machining different types of
connecting rods – whether on the transfer line or the machining centre as well as for
wet or MQL machining.
When machining the connecting rod, the small connecting pin bore in particular is a
challenge. Depending on the geometry, there are completely different drilling
situations. For example, for various connecting rod forms, flat, deep and conical
spherical surfaces or for existing forging noses. MAPAL has developed a modular
tool concept for drilling from the solid with indexable inserts especially for this type of
machining. Radially integrated, sintered indexable inserts each with four cutting
edges are used here.
The placement of the indexable inserts and the chip flutes are adapted to the special
requirements of the different drilling situations. The cutting materials are also
adapted. Among other things, the new CVD coating from MAPAL is used, which
combines the previously opposing high ductility and high wear resistance parameters
and thus allows machining with significantly higher cutting speeds than before.
The tool body of the new tools is made of an optimised material with significantly less
vibration. A central coolant supply in the holder ensures an optimum supply of
coolant directly at the cutting edges. This means a significant increase in process
reliability and stability during the machining of bores.


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