Countersinking Tool Blade Centering for Higher Machining Accuracy
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Solution Overview
Problem
Existing pressure-medium-controlled countersinking tools suffer from insufficient accuracy and reproducibility due to necessary clearance in the blade bearing, leading to a maximum countersinking accuracy of +/-0.2 mm, which is inadequate for modern manufacturing requirements.
Innovation Solution
A pressure-medium-controlled countersinking tool with a radially-acting blade centering protrusion in the blade housing that positively centers the blade during machining, eliminating radial displacement and maintaining axial play, achieving a countersinking accuracy of +/-0.1 mm and high reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clearance is provided in the blade bearing to enable blade extension without interference, then the blade can be extended freely, but the countersinking accuracy deteriorates to a maximum of +/-0.2 mm
Solution Approach 1:
A centering protrusion is introduced as an intermediary element between the blade and blade housing. This protrusion positively centers the blade during machining, eliminating radial displacement while maintaining the necessary clearance for free blade extension. The centering protrusion acts as a mediator that resolves the conflict between operational freedom and machining precision.
Solution Approach 2:
The invention changes the parameter of blade positioning by introducing a centering mechanism that actively controls radial position. Instead of relying on passive clearance, the centering protrusion actively maintains precise radial positioning during operation, improving countersinking accuracy from +/-0.2 mm to +/-0.1 mm while preserving extension freedom.
2Adaptability or versatility
If clearance is provided in the blade bearing, then blade extension is enabled, but radial displacement occurs reducing reproducibility
Solution Approach 1:
The centering protrusion serves as an intermediary that ensures consistent radial positioning of the blade during each extension cycle. This mediator element eliminates variability in blade position, thereby improving reproducibility while maintaining the adaptability needed for blade extension operations.
3Device complexity
If conventional blade bearing clearance is used, then blade operation is simplified, but countersinking accuracy is limited to +/-0.2 mm
Solution Approach 1:
The centering protrusion is a relatively simple intermediary element that can be integrated into the existing blade bearing structure. It provides significant accuracy improvement from +/-0.2 mm to +/-0.1 mm without substantially increasing device complexity, as the protrusion is a straightforward geometric feature rather than a complex mechanism.
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 centering device ensures precise and reproducible countersinking with improved accuracy by a factor of 10 compared to conventional tools, meeting expanded market requirements.
Implementation Method 1
a piston (24) arranged in a base body (2), by means of which the pressure medium (13) can be pressed into a cylinder space (25) of the base body (2), such that, when the piston (24) is displaced, a control bolt (27) is actuated
Implementation Method 2
a piston-cylinder unit, reference being made to the disclosure of EP 2 589 451 B1 with regard to the structure and mode of operation
Implementation Method 3
The machining process creates an axial machining force on the blade, which in a first preferred embodiment presses the blade with its centering groove against a housing-side centering bolt in the blade housing and centers and fixes it in its centering axis with a positive fit
Implementation Method 4
centers and fixes it in its centering axis with a positive fit
Implementation Method 5
The circularly profiled contact surfaces of the transversely extending centering groove arranged in the blade are positioned positively against complementary, likewise circularly extending contact surfaces of a housing-side centering bolt and center the blade on the housing-side centering bolt in the blade's centering axis extending in the longitudinal direction of the blade
Data Source
AI summary
Pressure-medium-controlled countersinking tool with one or more machining blades which are arranged in a rotatably driven base body and which can be actuated in their pivot position by supplying a pressure medium, wherein the actuation of the at least one blade takes place via at least one piston-cylinder unit actuated by the pressure medium, wherein the at least one blade is pivotably mounted on a bearing bolt forming a pivot axis and can be extended from a blade chamber arranged in the blade housing, wherein a centering device is arranged between the blade and the blade window of the base body in the radial distance from the pivot axis and in the pivot range of the at least one blade.