Rotating Tool Spacer for Deep Hole Run-Out Reduction
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Solution Overview
Problem
Rotating tools used for polishing the inner surface of holes in workpieces experience run-outs due to centrifugal force, leading to reduced accuracy and potential damage to the workpiece or tool breakage.
Innovation Solution
A rotating tool configuration that includes a spacer to maintain a specific spacing between the rotation center axis and the hole's peripheral wall, reducing run-out and enhancing processing accuracy by regulating the tool's movement and preventing contact with the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the shank length is increased to reach the bottom of deep holes, then the processing capability is improved, but the run-out increases due to centrifugal force
Solution Approach 1:
A support mechanism is introduced as an intermediary between the rotating tool and the hole wall. This support mechanism contacts the hole wall to provide additional support for the shank, reducing run-out caused by centrifugal force while enabling the use of longer shanks to reach deep holes.
Solution Approach 2:
The support mechanism is integrated with the existing tool structure, combining the grinding function and support function into a unified system. The support mechanism works together with the shank and grinding members to achieve both deep hole access and precision processing.
2Length of moving object
If the shank length is increased to process deep holes, then the processing capability is improved, but the risk of tool breakage increases
Solution Approach 1:
The support mechanism acts as an intermediary that distributes and reduces the mechanical stress on the shank by contacting the hole wall. This reduces the bending moments and centrifugal forces acting on the long shank, preventing breakage and improving tool reliability.
Solution Approach 2:
The support mechanism provides preemptive support to the shank during rotation, cushioning against the centrifugal forces and mechanical stresses that would otherwise accumulate and cause breakage in long shanks processing deep holes.
3Length of moving object
If the shank length is increased to reach the bottom of holes, then the processing capability is improved, but the run-out causes workpiece damage
Solution Approach 1:
The support mechanism serves as an intermediary that stabilizes the tool position by contacting the hole wall, preventing the run-out from transmitting harmful forces and vibrations to the workpiece, thus avoiding damage while enabling deep hole processing.
Solution Approach 2:
The support mechanism applies preliminary counteracting force to prevent the run-out from causing workpiece damage. By contacting the hole wall beforehand, it counteracts the centrifugal forces and stabilizes the tool before harmful effects can occur.
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 spacer effectively reduces run-out, stabilizes the tool's position, and prevents damage to the workpiece and tool, thereby improving processing accuracy and preventing tool breakage.
Implementation Method 1
when the rotating tool attached to a machine tool is rotationally driven, large run-outs can easily occur on the front side of the rotating tool due to centrifugal force
Data Source
AI summary
A rotating tool includes a tool body including a polishing tool and a shank, and a flange part provided in the tool body. The polishing tool includes a plurality of linear grinding members and a grinding member holder to hold the linear grinding members. The flange part is an annular member, and attached to the grinding member holder, so as to be movable in the direction of an axial line and rotatable about the axial line. When the inner circumferential surface of a hole formed in a workpiece is processed, the grinding member holder and the annular member are inserted into the hole. When run-out on the front side of the rotating tool occurs, the annular member comes into contact with the peripheral wall surface of the hole, whereby the run-out of the tool body is reduced.