Tool Accessory Hardness Gradient for Wear and Impact Resistance
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Solution Overview
Problem
Bit sockets and tool accessories face a trade-off between wear resistance and impact resistance, as high wear resistance requires high material hardness, which compromises toughness and impact resistance.
Innovation Solution
A tool accessory with a drive portion, tip, and shank formed as a unitary body from a common material, where each portion has a distinct hardness and toughness, achieved through initial heat treatment and subsequent localized heat treatments like induction tempering, allowing for a hardness gradient that balances wear and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high material hardness is used to improve wear resistance, then wear resistance is improved, but toughness and impact resistance deteriorate
Solution Approach 1:
The patent applies different heat treatment processes to different regions of the tool accessory. The tip region undergoes hardening to achieve high hardness (58-65 HRC) for wear resistance, while the shank and drive portion maintain lower hardness (40-50 HRC) for toughness and impact resistance. This localized property differentiation resolves the contradiction between wear resistance and impact resistance.
Solution Approach 2:
The patent changes the material parameters (hardness, toughness) through controlled heat treatment processes. By adjusting heating temperature, cooling rate, and treatment duration in different regions, the patent achieves a hardness gradient that optimizes both wear resistance at the tip and impact resistance in the shank, resolving the parameter trade-off.
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 provides a tool accessory with improved wear and impact resistance by unifying hardness and toughness across the accessory, enhancing its durability and performance in both high-wear and high-stress applications.
Implementation Method 1
the drive portion, the tip, and the shank are initially subjected to a first heat treatment to temporarily unify the hardness and the toughness of the tool accessory
Implementation Method 2
one of the drive portion and the tip are subsequently subjected to a second heat treatment different than the first heat treatment... the second heat treatment includes induction tempering
Data Source
AI summary
A tool accessory includes a drive portion configured to be engaged by an output shaft of a tool. The drive portion has a first hardness. The tool accessory further includes a tip configured to engage a workpiece. The tip has a second hardness different than the first hardness. The tool accessory further includes a shank interconnecting the drive portion and the tip. The shank has a third hardness different than the first hardness and different than the second hardness. The third hardness is between the first hardness and the second hardness, and the drive portion, the shank, and the tip are formed as a unitary body from a common material.