Elastic Tool Holder Structure for Tapping Stress Absorption
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Solution Overview
Problem
Existing tool holders for tapping operations apply excessive stress to the cutting edge of taps, leading to reduced machining accuracy due to complex stress absorbing mechanisms.
Innovation Solution
A tool holder with a simple structure featuring a first elastic portion between the shank and tool gripping portions, comprising voids that are elastically deformable along the axial and circumferential directions, allowing for effective stress absorption during tapping operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex stress absorbing mechanism with multiple mechanisms is used, then stress absorption capability is improved, but device complexity increases
Solution Approach 1:
The patent combines both axial direction stress absorption and circumferential direction stress absorption into a single integrated elastic portion. This elastic portion has a specific structure with varying thickness that allows it to absorb stresses from multiple directions simultaneously, eliminating the need for separate first and second stress absorbing mechanisms while maintaining comprehensive stress absorption capability.
Solution Approach 2:
The single elastic portion serves multiple functions: it absorbs stress in the axial direction, absorbs stress in the circumferential direction, and provides structural support between the shank portion and tool gripping portion. This multi-functional design replaces what would traditionally require multiple specialized components, simplifying the overall device structure.
2Device complexity
If a single stress absorbing mechanism is used, then device complexity is reduced, but stress absorption capability in multiple directions is insufficient
Solution Approach 1:
The elastic portion features non-uniform thickness distribution, with thinner regions positioned to absorb circumferential stresses and thicker regions providing axial support. This localized variation in geometric properties allows a single component to handle different stress directions effectively, with each region optimized for its specific stress absorption function.
Solution Approach 2:
The patent utilizes changes in the geometric parameters of the elastic portion, specifically the thickness parameter, to achieve different stress absorption characteristics in different directions. By varying the thickness strategically, the component can flex more easily in the circumferential direction while maintaining sufficient stiffness for axial load bearing.
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 tool holder effectively absorbs stress applied to the tap during tapping operations using a simple structure, maintaining machining accuracy by adjusting elastic properties to manage stress from feed errors and cutting edge interactions.
Implementation Method 1
The first elastic portion has a plurality of first voids and a plurality of second voids that extend between the body inner peripheral surface and the body outer peripheral surface, and is configured to be elastically deformable along an axial direction and around a circumferential direction
Data Source
AI summary
A tool holder includes a tubular body having a shank on a first axial end portion, a tool gripping portion on a second axial end portion, and an elastic segment interposed between the shank and the tool gripping portion in the axial direction of the body. The elastic segment is more elastically deformable along the axial direction and around a circumferential direction of the tubular body than the shank and the tool gripping portion owing to a plurality of voids that extend through the elastic segment from an outer peripheral side of the tubular body to an inner peripheral side of the tubular body. Each of the voids includes segments that extend around the circumferential direction and along the axial direction of the tubular body.