Yard Tool Blade Edge Geometry and Heat Treatment
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Solution Overview
Problem
Existing yard tools with sharpened shovel blades face challenges in maintaining precise sharpness and efficiency due to manual sharpening methods, which result in inconsistent cutting edges and increased user effort during digging operations.
Innovation Solution
A method of manufacturing yard tool blades involves machining a cutting edge on a distal edge of a blade blank, forming the blade into a shape, and heat treating it, with the cutting edge sharpened to an angle of 40 to 50 degrees, and optionally curving the blade, to achieve a hardened surface suitable for digging and cutting materials efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual sharpening methods are used on shovel blades, then the manufacturing process is simple and flexible, but the cutting edge consistency and sharpness precision deteriorate
Solution Approach 1:
The cutting edge is machined on the blade blank before the blade is formed into its final shape and before heat treatment. This preliminary machining ensures precise cutting edge geometry is established early in the manufacturing process, before subsequent forming and heat treatment steps that would otherwise require complex post-processing to achieve consistent sharpness.
Solution Approach 2:
The patent specifies precise angular parameters for the cutting edge (40 to 50 degrees) and controls the radius along the distal edge (0.006 to 0.025 inches). These parameter specifications, combined with machining before heat treatment, ensure consistent sharpness precision across all blades while maintaining a relatively simple manufacturing process.
2Productivity
If the cutting edge is sharpened to a very sharp angle, then the cutting efficiency is improved, but the edge durability and resistance to damage worsen
Solution Approach 1:
The patent optimizes the cutting edge angle to a specific range of 40 to 50 degrees, which balances cutting efficiency with edge durability. Additionally, a controlled radius of 0.006 to 0.025 inches is applied along the distal edge to prevent excessive sharpness that would make the edge prone to chipping, while maintaining sufficient sharpness for effective cutting.
Solution Approach 2:
The cutting edge is machined to the optimized angle and radius specifications before heat treatment. This preliminary action ensures the geometric parameters are precisely established before the heat treatment process, allowing the blade to achieve both cutting efficiency and edge durability through proper parameter optimization.
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 method significantly reduces user effort by up to 50% and maintains sharpness tolerances, enhancing the performance of yard tools like shovels, hoes, and rakes by providing a consistent, efficient cutting edge that is neither too sharp nor too blunt, thus improving digging efficiency.
Implementation Method 1
The shaped yard tool blade is heat treated after the cutting edge is machined on the distal edge
Data Source
AI summary
A yard tool blade is provided with a distal edge to dig a work material, with a surface to support the work material and an adaptor at a proximal end for receipt of a handle. The distal edge is sharpened to an angle within a tolerance of forty to fifty degrees for a reduced thickness to cut the work material. A method for manufacturing the yard tool blade forms a yard tool blade blank. A cutting edge is machined on a distal edge of the yard tool blade blank. The yard tool blade blank is formed into a shaped yard tool blade. The shaped yard tool blade is heat treated after the cutting edge is machined on the distal edge.