C-Chamfered Grinding Wheel Chips for Breakage Resistance
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Solution Overview
Problem
Conventional grinding wheels with increased grindstone chip height tend to break due to bending stress, and rectangular parallelepiped shapes cause intensive damage to the workpiece central portion during double-disc grinding.
Innovation Solution
A grinding wheel with vitrified bonded grindstone chips arranged on an annular base metal, where the chips are C-chamfered along their ridge portions to ⅕ or more of the short side length, preventing breakage and reducing central workpiece damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the height dimension of grindstone chips is increased to extend grinding wheel life span, then the life span is extended, but the chips break due to bending stress during grinding
Solution Approach 1:
The ridge portions of the grindstone chips are chamfered to create curved surfaces instead of sharp 90-degree angles. This curvature distributes stress more evenly throughout the chip structure, preventing stress concentration at the ridges and enabling the chips to withstand bending stress during grinding operations while maintaining increased height for extended service life.
2Strength
If the grindstone chips are formed into rectangular parallelepiped shape with long sides parallel to rotating direction, then breakage is avoided, but the ridge portions with 90° inner angles cause intensive damage to workpiece central portion
Solution Approach 1:
By chamfering the ridge portions to create curved surfaces, the patent eliminates the sharp 90-degree angles that cause intensive cutting into the workpiece center. The curved ridges distribute the cutting action more evenly across the workpiece surface, preventing localized damage while preserving the structural integrity and breakage resistance of the rectangular parallelepiped chip shape.
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 grinding wheel extends the life span of the grinding wheel by preventing breakage and minimizing intensive damage to the workpiece central portion during grinding, while maintaining a simple shape forming process.
Implementation Method 1
the grindstone chips are abraded away, and replacement of the grinding wheel is required
Data Source
AI summary
A grinding wheel which includes a plurality of vitrified bonded grindstone chips arranged on an outer periphery of an annular base metal thereof, and is configured to grind a workpiece with use of the grindstone chips while rotating the annular base metal, wherein each of the vitrified bonded grindstone chips is configured in such a manner that, in a rectangular parallelepiped including a rectangular grinding surface which is placed on an opposite side of the annular base metal and grinds the workpiece and four side surfaces adjacent to grinding surface, four ridge portions each of which is provided between the side surfaces are C-chamfered, each long side of the grinding surface is arranged along the outer periphery of the annular base metal, and each of the four ridge portions is C-chamfered in a range which is ⅕ or more of a length of each short side of the grinding surface.