Cubic boron nitride inserts, related methods, and related apparatus
AssigneeBoard of Trustees of Michigan State University
InventorPatrick Kwon
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Abstract
The disclosure relates to cubic boron nitride inserts for machining iron-based workpieces, as well as related methods and apparatuses. The insert includes a cutting element containing cubic boron nitride (cBN) in an amount in a range of 50 wt. % to 95 wt. % based on the cutting element, and a binder containing at least one of (i) alumina (Al2O3) and a manganese material (e.g., an oxide such as MnOx) and (ii) zirconia (ZrO2). The insert can be used for various machining processes, for example turning or boring. Suitable workpieces include iron-based materials or ferrous alloys, for example a cast iron such as compacted graphite iron (CGI).
Claims20
A method for machining an iron-based workpiece, the method comprising:
- providing an insert comprising a cutting element comprising:
- cubic boron nitride (cBN) in an amount in a range of 50 wt. % to 95 wt. % based on the cutting element;
- and
- a binder comprising at least one of (i) alumina (Al2O3) and a manganese material and (ii) zirconia (ZrO2), provided that, when the binder comprises the zirconia, the binder is free from alumina;
- and
- machining an iron-based workpiece by contacting the workpiece with the cutting element, thereby shaping the workpiece.
A method for machining an iron-based workpiece, the method comprising:
- providing an insert comprising a cutting element comprising:
- cubic boron nitride (cBN) in an amount in a range of 50 wt. % to 95 wt. % based on the cutting element the cBN having an average particle size in a range of 0.5 μm to 20 μm;
- and
- a binder present in an amount in a range of 5 wt. % to 50 wt. % based on the cutting element, the binder comprising alumina (Al2O3) and a manganese material;
- wherein:
- the alumina is present in an amount in a range of 5 wt. % to 99.5 wt. % based on the binder;
- the manganese material is present in an amount in a range of 0.01 wt. % to 5 wt. % based on the binder;
- a combined amount of the alumina and the manganese material is at least 99.5 wt. % of the binder;
- the manganese material comprises at least one of elemental manganese, manganese oxides, manganese nitrides, and manganese salts;
- and
- a weight ratio of alumina:manganese material in the binder is in a range of 2000:1 to 99550:1;
- and
- machining an iron-based workpiece by contacting the workpiece with the cutting element, thereby shaping the workpiece.
Dependencies are inferred from the claim text.