Boring Head Piston Fixation for Precise Tool Orientation
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Solution Overview
Problem
Existing boring heads face challenges in achieving precise and stable orientation and fixation of boring tools for fine boring applications, leading to potential changes in cutting diameter and orientation during machining, which affects the precision of hole geometry and dimension.
Innovation Solution
A combined orientation and fixation device comprising a blind sleeve and a tightening screw is used to simultaneously orient and fix the piston within the boring head, eliminating the need for direct contact between the boring tool and the main body, allowing for precise and stable positioning without compromising stiffness, and enabling fine adjustments of the cutting diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If direct contact between the boring tool and main body is used for fixation, then stiffness is improved, but orientation precision deteriorates due to potential orientation changes during fixation
Solution Approach 1:
The patent introduces a separate fixation device (screw or clamp) as an intermediary component that connects the piston to the main body without requiring direct contact between the boring tool and main body. This mediator transfers the fixation force through the piston's circumferential surface features (flat face, groove, or ridge) rather than through direct tool-main body contact, thereby maintaining both stiffness and orientation precision simultaneously
2Stability of the object's composition
If separate orientation and fixation devices are used, then orientation stability is improved, but device complexity increases
Solution Approach 1:
The patent combines the orientation and fixation functions into a single integrated solution. The piston's circumferential surface features (flat face, groove, or ridge) work together with the fixation device to simultaneously achieve both orientation alignment and positional fixation. This merging eliminates the need for separate orientation and fixation mechanisms, reducing device complexity while maintaining orientation stability
3Reliability
If multiple contact points are used for fixation, then fixation reliability is improved, but cutting diameter resolution deteriorates due to friction
Solution Approach 1:
The patent applies local quality by creating specific localized contact features on the piston's circumferential surface (flat face, groove, or ridge) that concentrate the fixation contact at precise locations. Instead of distributed multiple contact points across the entire piston surface, the fixation force is localized to specific geometric features that maintain both fixation reliability and minimal friction during cutting diameter adjustment
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 ensures precise and predictable orientation and fixation of the boring tool, enhancing cutting diameter resolution and maintaining sufficient stiffness for fine boring operations without direct contact, thereby improving machining precision and reducing the risk of orientation changes during fixation.
Implementation Method 1
a flexible end wall of the blind sleeve faces the flat face of the piston... the flexible end wall presses against the flat face of the piston when the tightening screw is tightened
Data Source
AI summary
A boring head for fixing a boring tool includes a main body mounted to a rotatable tool holder, a piston being received within and movable with respect to the main body in a radial direction, wherein a circumferential surface of the piston has a flat face parallel with the radial direction, and a combined orientation and fixation device for orienting and fixing the piston with respect to the main body. The combined orientation and fixation device includes a blind sleeve mounted in the main body, a flexible end wall of the blind sleeve facing the flat face of the piston, and a tightening screw configured for engagement with the blind sleeve so that the flexible end wall presses against the flat face when the tightening screw is tightened to press the piston against the main body and to simultaneously orient and fix the piston with respect to the main body.