New Reamer With Optimised Cooling for Cast Machining

MAPAL has now introduced its new CPR500/510 replaceable head reamer with optimised cooling. Seen for the first time at EMO 2017, the new reamer offers an economic advantage in cast machining with significantly longer tool life.

The solid carbide replaceable heads are designed with a diameter between 8 and 40mm and have an innovative CVD coating. This coating was developed by MAPAL especially for cast iron machining and the coating technology has already been successfully applied to cast iron milling operations.

An additional technical coup of the new development is the optimised cooling system that uses a sleeve. Due to the abrasiveness of the material, the issue of cooling is very important for cast machining. MAPAL has overcome this issue through its internal coolant supply and the respective outlets that are directed at the cutting edges. However there is a need to optimise the cooling process at the contact point between the arc land chamfer and bore wall. Often coolant does not reach this area and this can result in heat development and impairments to bore quality and tool life.

To counter this disadvantage, MAPAL has further developed the design of the CPR500/510 replaceable head so that it now has a sleeve attached behind the blades. The coolant is distributed through outlets at the sleeve end for the complete length of the cutting edges. In this way, the complete cutting edge and bore wall of the cast material are optimally cooled and lubricated.

Together both developments represent a quantum leap for reaming cast iron in terms of cost-effectiveness. For example, one customer could process 1,900 bores with the previous 19mm diameter tool. By changing to the new CPR500 replaceable head reamer with CVD coating and cooling using a sleeve, the tool life was more than quadrupled.