Conical Grinding Wheel Layout to Prevent Concave Knife Bevels
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Solution Overview
Problem
Conventional grinding machines with cylindrical grindstones often produce concave bevels on edged tools, reducing their strength and leading to uneven grinding due to wear and misalignment, especially when used with grinding jigs.
Innovation Solution
A grinding machine with a conical grinding wheel having a super-abrasive coating, where the edged tool is held perpendicular to the rotational direction of the wheel's envelope surface, preventing concavity and maintaining a flat grinding surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cylindrical grindstone is used for grinding edged tools, then the grinding process can be performed, but the bevels of the edge develop a concave profile that reduces blade strength
Solution Approach 1:
The patent inverts the conventional cylindrical grindstone shape to a conical shape. This inversion changes the grinding geometry so that the envelope surface of the rotating conical wheel provides a flat grinding contact area, preventing the development of concave bevel profiles and maintaining blade strength.
Solution Approach 2:
The patent employs a conical (curved) grinding wheel shape instead of a cylindrical one. The conical envelope surface creates a different contact geometry with the blade edge, resulting in a flat bevel profile rather than a concave one, thereby improving manufacturing precision of the bevel.
2Reliability
If a conventional grindstone is used, then grinding can proceed, but wear results in a chambered profile that causes misalignment between the grinding jig and grindstone surface
Solution Approach 1:
By inverting from cylindrical to conical geometry, the grinding wheel maintains its envelope surface shape even after wear. The conical shape ensures that the envelope surface remains consistent over time, preventing chambering and maintaining reliable alignment between the grinding jig and grindstone throughout the service life.
3Productivity
If a cylindrical grindstone is used, then the grinding process can be performed, but the edge bevels become concave requiring frequent re-grinding
Solution Approach 1:
The conical inversion creates flat bevel profiles that maintain edge strength, allowing the sharpened edge to last longer before requiring re-grinding, thereby improving the duration of action of the edged tool.
Solution Approach 2:
The conical curvature of the grinding wheel produces superior bevel geometry that enhances edge longevity, reducing the frequency of re-grinding operations and improving overall productivity.
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 results in stronger, planar edges with reduced concavity, increasing the edge's strength and longevity, and preventing chambering of the grinding wheel, ensuring consistent and efficient sharpening.
Implementation Method 1
The grinding wheel is made of metal with a super-abrasive coating
Data Source
AI summary
An arrangement (50) for grinding edged tools, such as knives, said arrangement (50) configured to be part of a grinding machine (100), comprising:a conical grinding wheel (110) arranged to be rotated in a rotational direction (R) and having an envelope grinding surface (111) for an edged tool (10), and;a grinding jig (120) for holding an edged tool (10), wherein the grinding jig (120), in use, is arranged such that the edged tool (10) extends over the envelope grinding surface (111) perpendicular to the rotational direction (R) and wherein the grinding wheel (110) is made of metal with a super-abrasive coating.