Tool Holder Clearance Fit for Centrifugal Positioning
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Solution Overview
Problem
Current cutting and grinding machines require high-speed rotation of the shaft to maintain tool position due to low centrifugal force at reduced speeds, leading to increased energy consumption and costly equipment, while also facing challenges in tool return to position after encountering obstacles.
Innovation Solution
The tool holder device features mounting holes with clearance for relative movement between the shackle and axial support, allowing tools to return to their radial position effectively even at lower shaft rotation speeds, with designs such as circular and triangular sections providing increased clearance for smooth operation and retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shaft rotates at high speed to maintain tool position, then the centrifugal force is sufficient to keep tools in radial position, but the energy consumption and equipment cost increase significantly
Solution Approach 1:
The patent changes the geometric parameters of the mounting holes and axial support to create a clearance fit. This parameter change allows the tool to return to radial position through the clearance mechanism even at reduced rotation speeds, eliminating the need for high-speed rotation to maintain tool position and thereby reducing energy consumption
Solution Approach 2:
The tool holder device uses the centrifugal force generated at lower speeds, combined with the clearance between the mounting hole and axial support, to automatically return the tool to its radial working position. The system serves itself by using the available centrifugal force efficiently through the clearance mechanism, eliminating the need for high-speed rotation
2Use of energy by moving object
If the shaft rotates at reduced speed to save energy, then energy consumption decreases, but the centrifugal force is insufficient to return tools to radial position after hitting obstacles
Solution Approach 1:
By changing the geometric parameters to create a clearance fit between the mounting hole and axial support, the patent enables the tool to return to radial position through the clearance mechanism even when centrifugal force is reduced at lower rotation speeds
Solution Approach 2:
The clearance between the mounting hole and axial support acts as an intermediary mechanism that facilitates tool return to position. This clearance allows the tool to move freely back to its radial position through the action of reduced centrifugal force, bridging the gap between low-speed operation and reliable tool positioning
3Stability of the object's composition
If the mounting holes have tight fit with axial support, then the tool position is stable, but the tool cannot retract freely when encountering obstacles
Solution Approach 1:
The patent changes the fit parameter from a tight interference fit to a clearance fit between the mounting hole and axial support. This parameter change allows the tool to retract freely when encountering obstacles while maintaining stability during normal operation through the controlled clearance
Solution Approach 2:
The clearance fit creates a dynamic connection between the mounting hole and axial support, allowing relative movement when needed. The connection is stable during normal cutting operation but becomes flexible when the tool encounters obstacles, enabling free retraction without requiring complex mechanical mechanisms
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
This solution enables high cutting efficiency at reduced rotation speeds, saving energy and ensuring tools can retract and return to position without interference from obstacles, maintaining operational effectiveness.
Implementation Method 1
the tools are returned to their working position, generally perpendicular to the shaft that carries them, by the centrifugal force generated by the rotation of the shaft
Data Source
Figure 1~2
Figure 3~5
Figure 6~14
AI summary
The device has a shaft (1) i.e. hollow tube, carrying a flail (2) composed of a mounting unit i.e. non-working portion (23), with a mounting orifice (21). An axial support (11) i.e. semi-octagonal rod, and the orifice have non-circular portions (12, 22) that are fitted in one another under the action of centrifugal force, for maintaining the unit in work position. A section of the orifice is larger than a section of the support to authorize the displacement of the unit around the support when the unit is brought to another position, by the presence of an obstacle on the course of the flail.