Mapal has released its HPR400 reaming tool to simplify the fine machining of bores with large diameters in a defined tolerance range. According to the company, tool quantity can therefore be reduced, as can the subsequent logistics and even tool-setting efforts.
The fine machining of large, tight-tolerance bores traditionally leads machine shops to deploy multi-edged reaming tools as these are both fast and less sensitive to interrupted cuts. However, the reconditioning of reamers with fixed inserts is a complex process.
Instead, by incorporating high-accuracy insert seats on the HPR400, customers can replace inserts instantly using a torque wrench. Incorrect insert mounting is eliminated, as only one mounting position is possible and the inserts can be fitted in any pocket. As a result, no setting is required and there is no need to send tools away for time-consuming or expensive reconditioning.
Available from 50 to 315 mm diameter, the HPR400 is offered with either a HSK or Mapal’s own module adaptor. It can be applied to almost any workpiece material as inserts are available in a variety of grades and geometries.
For machining cast iron, Mapal has developed the wear-resistant HC419 insert grade with a CVD coating for use with the HPR400 reaming tool. One automotive customer is using the tool to machine the main bore in a differential housing made from GJS400 cast iron. With a tool diameter of 150 mm using eight inserts, the HPR400 is obtaining a tolerance level of IT7. These results arrive using a cutting speed of 160 m/min with a feed of 1.6 mm to achieve an average surface finish of 1.35 Ra.
For further information
www.mapal.com