Mikron improves drilling in hardened steels

A Mikron Tool SA Agno product story
Edited by the Manufacturingtalk editorial team Apr 7, 2008

The drilling of hardened materials is a real challenge for mould and die makers, said Mikron Tool, but a range of drills guarantee hole accuracy and process reliability.

High performance cutting tools are the key to efficient injection mould and die machining, said Mikron Tool.

The majority of mould and die makers use CNC machine tools for such demanding tasks.

A mould normally is unique, said Mikron Tool to manufacturingtalk, and highly complex and its machining is connected to considerable risks.

As far as drilling hardened steels is concerned, Mikron Tool offers its CrazyDrill for the high precision drilling of hard materials.

Tests on a Mikron VCP 600 machining center with a drill 2.15mm diameter and a depth of 10xD (D = hole diameter) in 90MnCrV8 (W.Nbr.

1.2842) steel with a hardness of 60 HRc have shown a perfect surface quality as well as accuracy.

* Drilling process - first, using a CrazyDrill Pilot, a hole to a depth of 2 x D was drilled.

The subsequent hole was drilled using a CrazyDrill Cool at a cutting speed of v = 30m/min and a feed rate of f = 0.03mm/rev.

Two pecking cycles were included, the first one at 5 x D and the second one at 8 x D.

A total of 300 holes have been made, reported Mikron Tool.

The drilling process was cooled and lubricated using Motorex Ortho Nf-X10 with a 5 micron filter at a pressure of 70 bar and a was employed.

During the machining the torque Mz (Nm) and the advance force F (N) were monitored with a Kistler measuring device.

The progressive wear of the drill caused an increase of the torque MZ and the force F.

After 240 holes the CrazyDrill was still in good condition, said Mikron Tool.

After drilling 300 holes, torque was Mz = 0.5Nm.

The breakage of the drill happened at 0.8Nm torque value.

Mikron Tool said it has established a 'top notch' reputation in expert circles as a manufacturer of smallest, small and mid-sized cutting tools in the high-end quality segment.

The manufacturing programme includes drills with a diameter range of 0.1mm to 6mm.

There is a wide range of customer tailored special purpose cutting tools designed for specific applications.

As a partner in development projects including particularly complex cases, the company has already realised a vast variety and number of projects in close cooperation with customers.

Thus, as a result of cooperating with Mikron Tool, more than a few production operations have benefited from boosts in productivity and have succeeded in reducing costs per operation always maintaining highest quality standards.

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A Pro-talk Publication

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