Boring Tool Shank Neck for Torsional Load Relief
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Solution Overview
Problem
Boring tools face challenges in distributing torsional loads and shear stresses, leading to reduced durability and performance, especially when used with high-torque driving devices and various working media.
Innovation Solution
A boring tool design featuring a torsion release neck with a smaller diameter than the shank, strategically positioned to concentrate and manage torsional loads, combined with transitions to reduce stress concentrations, enhances durability and performance while maintaining cost-effectiveness in manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shank diameter is reduced to lower manufacturing costs, then manufacturing cost decreases, but torsional load distribution worsens
Solution Approach 1:
The shank features a torsion release neck with a smaller diameter than the main shank body. This local reduction in diameter creates a specific geometric feature that concentrates torsional loads in a controlled manner, allowing the majority of the shank to maintain sufficient strength while reducing overall material usage and manufacturing cost.
Solution Approach 2:
The patent modifies the shank's geometric parameters by introducing a torsion release neck with a reduced diameter compared to the main shank body. This parameter change optimizes the distribution of torsional loads along the shank length, improving reliability while allowing cost-effective manufacturing.
2Productivity
If high-torque driving devices are used to increase boring performance, then productivity increases, but shear stresses increase
Solution Approach 1:
The torsion release neck creates a localized region with different mechanical properties compared to the main shank. This local geometric feature is specifically designed to manage stress distribution, allowing high-torque driving devices to be used effectively while controlling shear stresses through the neck's reduced cross-section.
Solution Approach 2:
The torsion release neck converts the harmful effect of concentrated shear stresses from high-torque operation into a beneficial stress distribution pattern. By creating a controlled weak point at the neck, the design allows the main shank and cutting portion to withstand high torsional loads without excessive stress concentration, thereby enabling the use of high-torque driving devices for improved productivity.
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 design effectively reduces torsional loading and shear stresses, improving the boring tool's durability and performance by distributing forces more efficiently, leading to straighter holes and reduced likelihood of material failures, while being cheaper to produce.
Implementation Method 1
a torsion release neck disposed between the first end and the second end... effectively reduces torsional loading and shear stresses... by distributing forces more efficiently
Data Source
AI summary
A boring tool includes a coupling portion, a shank, and a cutting portion. The shank further includes a torsion release neck, having a smaller diameter cross section than a first end of the shank and a second end of the shank, a first transition to the first end of the shank, and a second transition to the second end of the shank. A torsion release neck has a lower polar moment of inertia than other portions of the boring tool so that it may guide torsional loading and shear stresses in the boring tool away from the cutting and coupling portions to improve the durability of the boring tool as a whole.