Conical Grinding Wheel Layout for Flat Knife Bevels
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Solution Overview
Problem
Conventional grinding machines with cylindrical grindstones often produce concave bevels in edged tools, leading to reduced strength and uneven sharpening, especially due to wear that causes misalignment between the grinding jig and the grindstone.
Innovation Solution
A conical grinding wheel with a super-abrasive coating is used, where the edged tool is held perpendicular to the rotational direction, providing a flat grinding surface that minimizes concavity and maintains the wheel's shape, preventing chambering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cylindrical grindstone is used for grinding edged tools, then the grinding process can be performed, but the bevels of the edge develop concave profiles that reduce blade strength
Solution Approach 1:
The invention changes the geometric parameters of the grinding wheel from cylindrical to conical shape. This parameter change transforms the grinding surface from curved to substantially flat, eliminating the concave profile formation on blade bevels and maintaining blade strength.
Solution Approach 2:
The invention transitions from a two-dimensional cylindrical surface to a three-dimensional conical surface with a flat envelope. This dimensional change allows the grinding surface to remain substantially flat during rotation, preventing concavity in the ground edges.
2Duration of action of stationary object
If a conical grindstone is used with a grinding jig, then grinding can be performed, but wear causes the grindstone to develop a chambered profile leading to misalignment
Solution Approach 1:
The conical geometry with flat envelope surface changes the wear pattern characteristics. The flat surface distributes wear more uniformly, preventing the development of chambered profiles that cause misalignment between the grinding jig and grindstone surface.
3Volume of moving object
If the grindstone diameter is reduced, then the grinding machine size can be reduced, but the concavity of blade bevels increases
Solution Approach 1:
The invention changes the shape parameter from cylindrical to conical, which fundamentally alters the relationship between size and surface flatness. This allows small grindstones to maintain substantially flat envelope surfaces, eliminating concavity regardless of reduced diameter.
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
This arrangement results in stronger, planar edges with increased efficiency and longer tool life, as the conical grinding wheel maintains its shape and prevents uneven sharpening.
Implementation Method 1
the edge of the tool, such as a knife, is sharpened against the cylindrical outer surface of the grindstone
Implementation Method 2
The grinding wheel may be 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).