Composite Outer Blade Wheel for Thin High-Accuracy Magnet Cutting
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Solution Overview
Problem
Existing outer blade cutting wheels for rare earth sintered magnets face challenges in achieving high accuracy and reduced machining costs while maintaining productivity, as they require stronger and more rigid cutting tools to efficiently cut through the magnets.
Innovation Solution
An outer blade cutting wheel with a cemented carbide base and a metal bond that includes diamond or CBN grains, where the metal bond has a higher Young's modulus and Vickers hardness, is used to enhance mechanical strength and rigidity, allowing for a thinner blade section and increased cutting speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blade thickness is reduced to improve productivity and yield, then the machining speed and material utilization improve, but the mechanical strength and rigidity of the blade decrease
Solution Approach 1:
The blade is constructed as a composite structure combining a cemented carbide base (providing rigidity and strength) with a metal bond layer containing abrasive grains (providing cutting functionality). This composite design allows the blade to maintain high mechanical strength while reducing overall thickness, resolving the contradiction between productivity improvement through thinning and strength maintenance.
2Manufacturing precision
If the blade thickness is reduced to improve yield and reduce machining cost, then the material utilization improves, but the cutting accuracy and stability deteriorate
Solution Approach 1:
The cemented carbide base provides exceptional rigidity (Young's modulus 450-700 GPa) that maintains cutting accuracy even when the blade is thin, while the metal bond layer with abrasive grains enables effective cutting. This composite structure allows reduced blade thickness for improved yield while maintaining manufacturing precision through the high rigidity of the cemented carbide substrate.
3Manufacturing precision
If a cemented carbide base is used to improve mechanical strength and rigidity, then the blade deflection is reduced and cutting accuracy improves, but the manufacturing cost increases
Solution Approach 1:
The blade combines expensive cemented carbide base (providing rigidity and accuracy) with a metal bond layer containing abrasive grains (providing cutting function). This composite approach concentrates the high-cost material only where structural rigidity is needed, rather than making the entire blade from expensive material, thus reducing overall manufacturing cost while maintaining cutting accuracy.
4Productivity
If the blade is made thinner to accelerate machining speed, then the productivity improves, but the heat management and self-sharpening capability worsen
Solution Approach 1:
The metal bond layer containing abrasive grains provides thermal management capabilities and self-sharpening functionality that are essential for thin blades operating at high speeds. The composite structure allows the thin blade to dissipate heat effectively and maintain cutting edge integrity through self-sharpening, enabling high machining speeds without compromising temperature control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables high-accuracy cutting with reduced machining costs and improved productivity by maintaining cutting performance even at reduced blade thickness, facilitating self-sharpening and efficient heat management during the cutting process.
Implementation Method 1
a metal bond having a higher strength and higher modulus is used to bind abrasive grains comprising diamond grains, CBN grains or a mixture of diamond grains and CBN grains to the outer periphery of the base
Implementation Method 2
Cemented carbides made by cementing tungsten carbide (WC) grains in a binder matrix of cobalt or nickel metal by sintering are robust materials having a Young's modulus as high as 450 to 700 GPa and extraordinarily stronger than the steel alloy materials having a Young's modulus of the order of 200 GPa. A high Young's modulus implies that the quantity of deformation of a blade under a cutting force (or cutting resistance) is reduced.
Implementation Method 3
a blade section disposed on the outer periphery of the base and comprising abrasive grains bound with a metal bond, the abrasive grains comprising diamond grains, CBN grains or a mixture of diamond grains and CBN grains
Data Source
AI summary
In an outer blade cutting wheel comprising an annular thin disc base of cemented carbide having an outer diameter of 80-200 mm, an inner diameter of 30-80 mm, and a thickness of 0.1-1.0 mm, and a blade section disposed on an outer periphery of the base, the blade section comprises diamond grains and/or CBN grains bound with a metal bond having a Young's modulus of 0.7-4.0×1011 Pa and has a thickness which is greater than the thickness of the base by at least 0.01 mm. The outer blade cutting wheel is capable of cutting a workpiece at a high accuracy and a reduced allowance, improves machining yields, and reduces machining costs.