Hard part turning description (2)
Blade grades are becoming increasingly desirable to meet operational requirements in today's cutting field. Cubic boron nitride grades are usually preferred, followed by ceramic grades to optimize application requirements:
• CB7015 is suitable for continuous cutting from occasional processing to occasional light intermittent cutting, mainly for case hardened steel.
• CB7025 is suitable for long continuous cutting to heavy duty interrupted cutting, often characterized by poor cutting conditions, such as burrs and non-bevel angles, mainly used for hardened steel.
• The CB7050 is suitable for hardened steels where the shape of the part varies greatly and may be severely distorted, or where there is a non-tilt interruption.
• GC6050 is a ceramic grade that complements cubic boron nitride in some operations. It is suitable for light continuous finishing under good conditions and is mainly used for case hardened steel where surface quality is not critical.
For parallel or perpendicular to the centerline of the part, hard part turning of hardened parts should use the Xcel insert of the CB7015 series.
In terms of the insert groove type, the cutting edge of the hard part processing insert is relatively blunt due to the high cutting edge strength, but this does not mean that the gutter type problem is not important. Although the chipbreaker is not part of the chamfer of the blade section edge, the combination of honing, tool nose radius, wiper edge and advance angle is critical to performance and results.
Over the years, the wiper blade technology has revolutionized the turning precision. It also improves the turning of hard parts. Today, specially developed wiper blades are available for hard part turning and semi-finishing operations with a significantly higher feed rate capability than conventional tool nose radius.
The Xcel insert geometry is a further optimization of the feed rate/surface finish of hard parts. It carefully balances the straight cutting edge and wiper technology with a small advance angle. The small advance angle receives the advance angle of the primary blade, which is slightly higher than the cutting depth value of the blade. It acts as a thinning chip, allowing for higher feed rates. This will be beneficial for productivity and will help reduce blade wear at the depth of cut. The Xcel concept reduces cutting temperatures and provides considerable improvements in productivity.
to sum up
Today, hard part processing can be more extensively optimized. As a process, it is now moving forward to meet a variety of routine and new requirements. Achieving higher performance, offering more choices, and the advent of a new generation of cutting tools have made this possible. Thanks to a range of new and improved cubic boron nitride grades, insert geometry and toolpath strategies, hard part machining is able to achieve newer and higher levels of competition.
What is hard part turning?
Hard part turning (HPT) is a single point turning of high hardness workpieces. Typically, the hardness of the process ranges from 58 to 68 HRc. Workpiece materials include hardened alloy steel, tool steel, case hardened steel, and heat treated powder metallurgical parts. It is mainly a finishing process, but it can also be a semi-finishing process that requires high precision in dimensional and surface finish. These surfaces have often been previously ground.
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