Composite Tool Bit Structure for Wear and Torsional Stress
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Solution Overview
Problem
Existing tool bits experience wear and tear on the working end due to high hardness, leading to reduced impact resistance and increased torsional stress, which affects their durability and efficiency in driving fasteners.
Innovation Solution
The tool bit is designed with a working end made of a harder material and a shank made of a softer material, utilizing manufacturing processes like two-shot metal injection molding or cladding to integrate these materials, and incorporating structural features such as a hollow core and offset strands to reduce torsional stress and enhance impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the working end is made of high hardness material, then wear resistance is improved, but impact resistance deteriorates
Solution Approach 1:
The tool bit applies different material properties to different parts: the working end uses high hardness material for wear resistance while the shank uses softer material for impact resistance. This local differentiation resolves the contradiction by optimizing each region for its specific functional requirements.
Solution Approach 2:
The tool bit combines multiple materials with different properties - a harder working end material and a softer shank material - to simultaneously achieve wear resistance at the working end and impact resistance in the shank, resolving the contradiction through material composition.
2Duration of action of stationary object
If the working end is made of high hardness material, then durability is improved, but torsional stress increases
Solution Approach 1:
The shank is designed with softer material properties specifically in the regions subject to torsional stress, while maintaining hardness at the working end. This local property differentiation reduces torsional stress in the shank while preserving durability at the working end.
3Reliability
If the shank is made of softer material, then impact resistance is improved, but wear resistance deteriorates
Solution Approach 1:
The softer material is specifically applied to the shank region where impact resistance is critical, while the harder material is applied to the working end where wear resistance is critical. This spatial differentiation of material properties resolves the contradiction.
4Duration of action of stationary object
If the shank is made of softer material, then durability is improved, but wear resistance deteriorates
Solution Approach 1:
The tool bit uses a composite material structure with softer shank material for durability and harder working end material for wear resistance, resolving the contradiction through strategic material selection and placement.
Data Source
AI summary
A tool bit includes a hexagonal drive portion, a working end, and a shank. The working end is made of a first material and a has a first hardness. The shank connects the drive portion to the working end. The shank defines a longitudinal axis about which the tool bit is rotatable. The shank is made of a second material having a second, different hardness. The shank includes a protrusion and an annular shoulder. The shank extends within a portion of the working end and has a distal end. The annual shoulder surrounds the protrusion. At least one of the distal end or the shoulder is oriented perpendicular to the longitudinal axis.