Hydraulic Rotary Tool Chuck for Long-Reach Low-Vibration Machining
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Solution Overview
Problem
In machine tools, a large protrusion length of processing tools relative to their diameter leads to increased vibration, making precise processing at distant locations difficult and potentially requiring costly alternative methods like electric discharge machining or laser machining, which may compromise accuracy.
Innovation Solution
A processing apparatus with a movable base portion and a liquid supply unit that rotates a processing tool via a chuck portion, allowing the tool to be driven by liquid pressure, reducing vibration by maintaining a shorter effective length and enhancing torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the protrusion length of the tool from the spindle is increased to reach distant processing locations, then the processing reach is improved, but vibration at the tip portion increases
Solution Approach 1:
The patent replaces the conventional mechanical rotation system (spindle rotating the tool) with a localized rotation system where a motor disposed inside the tool rotates it at the tip portion. This substitution eliminates the vibration problem caused by long protrusion lengths while maintaining the ability to reach distant processing locations.
Solution Approach 2:
The patent segments the rotation function from the spindle to the tool itself by disposing a motor inside the tool. This segmentation allows the tool to rotate independently at its tip portion, enabling stable processing even when the protrusion length is large relative to the tool diameter.
2Manufacturing precision
If the protrusion length to diameter ratio is suppressed to reduce vibration, then processing stability is improved, but the ability to process narrow locations away from the spindle is reduced
Solution Approach 1:
By replacing the spindle-based mechanical rotation system with a localized motor inside the tool, the invention enables the tool to rotate stably even with large protrusion length to diameter ratios, thereby maintaining processing stability while improving adaptability to narrow distant locations.
Solution Approach 2:
The patent introduces a dynamic rotation capability directly at the tool tip through the internal motor, allowing the tool to adapt to various processing locations including narrow areas. This dynamic localization of rotation enables stable processing regardless of the protrusion length to diameter ratio.
3Device complexity
If conventional machine tool configuration is used with spindle rotation, then simple structure is maintained, but vibration increases with large protrusion length
Solution Approach 1:
The patent segments the rotation function from the spindle to the individual tool by incorporating a motor inside the tool. While this increases device complexity slightly, it dramatically reduces vibration by enabling stable rotation at the tool tip regardless of protrusion length.
Solution Approach 2:
The invention substitutes the centralized spindle rotation mechanism with distributed localized rotation at each tool through internal motors. This substitution resolves the vibration issue while maintaining relatively simple overall system architecture.
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
Enables stable processing even with a high protrusion length to diameter ratio, suppressing vibration and maintaining processing accuracy, while using lubricants for cutting, thus reducing tool wear and eliminating the need for separate driving liquids.
Implementation Method 1
a drive unit disposed inside the cylinder and including a rotating body configured to rotate around a central axis by the liquid introduced from the liquid supply unit via the base portion
Implementation Method 2
an apparatus main body including a base portion that is movable and a liquid supply unit that is configured to supply a liquid to the base portion
Data Source
AI summary
A processing apparatus includes: an apparatus main body including a base portion that is movable and a liquid supply unit that supplies a liquid to the base portion; a chuck portion connected to the base portion and including an attachment hole that is open outward; and a processing tool detachably mounted on the chuck portion. The processing tool includes a cylinder fitted into and held by the attachment hole, a drive unit disposed inside the cylinder and including a rotating body to be rotated around a central axis by the liquid introduced from the liquid supply unit via the base portion, a rotary shaft protruding outward from an inside of the cylinder along the central axis to rotate integrally with the rotating body, and a tool portion connected to a tip of the rotary shaft.