Boring Head Orientation Mechanism for Stable Fine Diameter Setting
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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, particularly in maintaining cutting diameter precision without compromising stiffness or causing orientation changes during machining.
Innovation Solution
A combined orientation and fixation device using a blind sleeve and tightening screw is employed 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 radial positioning and adjustment of the cutting diameter with minimal friction.
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 orientation changes during fixation
Solution Approach 1:
The patent introduces a flexible membrane as an intermediary element between the piston and the blind sleeve. This membrane transmits the clamping force from the tightening screw to the piston while maintaining a clearance that prevents direct contact and orientation changes. The flexible nature of the membrane allows force transmission without rigid constraint, thus preserving orientation precision while providing sufficient fixation stiffness.
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 mechanism. The blind sleeve with flexible membrane performs both functions simultaneously: as the tightening screw advances, the membrane flexes to transmit force that both orients the piston correctly against the flat face and fixes it in the desired radial position. This eliminates the need for separate orientation and fixation devices, reducing overall system complexity while maintaining stability.
3Strength
If multiple contact surfaces are used for fixation, then stiffness is improved, but cutting diameter resolution deteriorates due to friction
Solution Approach 1:
The flexible membrane serves as a mediator that transmits clamping force without creating high-friction contact. The membrane's flexibility allows it to conform and transmit force smoothly, minimizing friction between the piston and the blind sleeve. This reduces the friction that would otherwise interfere with the positioning means' ability to achieve fine adjustments of the cutting diameter, while still providing sufficient stiffness for machining.
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 precise and predictable orientation and adjustment of the boring tool, enhancing cutting diameter resolution and maintaining sufficient stiffness for fine boring applications without direct contact, thus improving machining accuracy 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
Implementation Method 2
the combined orientation and fixation device is configured so that the flexible end wall presses against the flat face of the piston when the tightening screw is tightened
Data Source
Figure 1~2
Figure 3a~3b
Figure 4a~5
AI summary
A boring head (101) for fixing of a boring tool (102) to a rotatable tool holder, wherein the boring tool is intended for cutting machining of a workpiece upon rotation of the boring tool around an axis of rotation defining an axial direction (Z), the boring head comprising: - a main body (103) mounted to the rotatable tool holder; - a piston (104) for holding the boring tool, said piston being received within a guiding cavity (105) of the main body and being movable with respect to the main body in a radial direction (X), wherein a circumferential surface of the piston comprises a flat face (106) extending in parallel with the radial direction; - a positioning means (110) for radial positioning of the piston within the guiding cavity; - a combined orientation and fixation device (120) for orienting and fixing the piston with respect to the main body, the combined orientation and fixation device comprising: ∘ a blind sleeve fixedly 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 threaded engagement with the blind sleeve, wherein the combined orientation and fixation device is configured so that the flexible end wall presses against the flat face of the piston when the tightening screw is tightened, thereby pressing the piston against the main body so as to simultaneously orient and fix the piston with respect to the main body.