Drill Head Slider Mechanism for Flat-Base Blind Hole Chambering
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Solution Overview
Problem
Conventional drill heads are unable to effectively chamber blind holes with a flat base due to the limitations in the design, which prevents the cutting edge from reaching the end of the guide hole, resulting in incomplete material removal and suboptimal weight reduction in components like aircraft landing gear legs.
Innovation Solution
A drill head design featuring a central slider and cutting slider coupled via helical teeth, with a drag slider and cutting slider mechanism that allows for radial movement, enabling the cutting edge to extend further and reach the bottom of the blind hole, and an exchangeable cranked insert holder for varied machining operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the central slider carries out a large stroke due to the transmission ratio of the helical teeth, then the cutting edge cannot reach the front part of the guide hole, but the structural integrity of the drill head is maintained
Solution Approach 1:
The invention introduces a second recess extending in the axial direction, perpendicular to the first recess, allowing the cutting slider to move in an additional axial dimension. This dimensional change enables the cutting edge to reach the front part of the guide hole without increasing the radial stroke of the central slider, resolving the contradiction between slider stroke length and cutting edge reachability.
2Length of stationary object
If the cap for the central slider protrudes far beyond the cutting slider in the axial direction, then the guide hole cannot be fully utilized, but the mechanical interface remains stable
Solution Approach 1:
By adding the second axial recess and enabling the cutting slider to move in the axial direction, the invention allows the cutting edge to extend further axially without requiring the cap to protrude beyond the cutting slider. This resolves the contradiction by utilizing the additional axial dimension for cutting motion rather than requiring excessive cap protrusion.
3Ease of operation
If the drill head is designed for continuous guide holes, then the cutting edge cannot reach the end of blind holes, but the guidance system remains simple
Solution Approach 1:
The invention makes the cutting slider dynamic by enabling it to move in both radial and axial directions through the coupled recess mechanism. This dynamic capability allows the drill head to adapt to both continuous guide holes and blind holes, resolving the contradiction between guidance simplicity and machining versatility.
Solution Approach 2:
The coupled recess mechanism provides multi-functionality, allowing the same drill head structure to handle both continuous guide holes and blind holes effectively. The cutting slider can operate in radial motion for continuous holes and combine radial-axial motion for blind holes, achieving universality without complicating the guidance system.
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 design enhances the rigidity of the insert holder, allows for complete machining of blind holes, reduces material waste, and increases productivity by enabling the creation of blind holes with a flat base, thus optimizing weight reduction and expanding the tool's application range.
Implementation Method 1
the central slider and the at least one cutting slider being coupled to one another in such a way that a relative movement between the central slider and the body causes a radial advancing movement of the cutting slider or sliders
Implementation Method 2
a drag slider is guided in the second recess or recesses in each case, and in that in each case a cutting slider and a drag slider are coupled to one another in such a way that advancing movements of the drag slider are transmitted to the cutting slider coupled thereto
Data Source
AI summary
The invention relates to a drill head for chambering a blind hole with a flat base, and a method directed thereto.