Cylindrical Tool Bit Shank Design for Wear Resistance
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Solution Overview
Problem
Serrated cutting edges on motor grader blades wear out quickly due to abrasive materials, necessitating frequent replacement and are often expensive due to complex geometry and costly inserts.
Innovation Solution
A tool bit with a cylindrical shank and working portion, featuring a flat bottom surface and cross-hole, designed for attachment to a blade assembly, allowing for cost-effective manufacturing and potential insert integration for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If serrated cutting edges are provided to improve penetration, then cutting performance is improved, but the teeth wear out quickly due to abrasive materials
Solution Approach 1:
The blade is divided into multiple replaceable tool bits with individual cylindrical teeth, allowing selective replacement of worn teeth without replacing the entire blade assembly. This segmentation enables maintenance of cutting performance while extending overall blade system life.
Solution Approach 2:
The invention changes the geometric parameters of the cutting teeth from traditional serrated edges to cylindrical profiles with specific diameter ratios (working portion diameter greater than shank portion diameter). This parameter change optimizes both penetration capability and wear resistance.
2Productivity
If complex geometry is machined onto tool bits after forging, then cutting performance is improved, but manufacturing cost increases
Solution Approach 1:
The cutting teeth are designed with cylindrical curvature rather than complex angular geometry. This allows the teeth to be manufactured using simpler forming processes and reduces the need for expensive post-forging machining operations while maintaining effective cutting performance.
Solution Approach 2:
By defining specific cylindrical geometric parameters (diameter ratios between working and shank portions), the invention simplifies the manufacturing process while ensuring optimal cutting performance through standardized, easily manufacturable shapes.
3Duration of action of moving object
If inserts or tiles of hardened material are placed at the tip of tool bits, then durability is improved, but cost increases
Solution Approach 1:
Instead of using expensive hardened inserts, the invention achieves localized durability by optimizing the cylindrical geometry of the tooth itself, with the working portion having a larger diameter than the shank portion. This geometric optimization provides the necessary durability without requiring additional hardened material inserts.
Solution Approach 2:
The invention employs simpler, more cost-effective tool bit designs that can be replaced or reconfigured as needed, rather than relying on expensive hardened inserts. The cylindrical geometry provides sufficient durability for the application while maintaining lower manufacturing costs.
Data Source
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AI summary
A tool bit (200, 300, 400, 500) comprises a shank portion (202, 302, 402, 502) including a cylindrical configuration defining a longitudinal axis (L), a radial direction (R), and a circumferential direction (C), and a working portion (204, 304, 404, 504) including a cylindrical configuration that is concentric with the shank portion (202, 302, 402, 502) and a flat bottom surface (218, 318, 418, 518).