Ejector Deep Drilling Tool Vibration Damping
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Solution Overview
Problem
Ejector deep drilling tools experience oscillation and reduced drilling depth due to external vibration dampers, which complicate handling and reduce machining accuracy, and require precise structural design to avoid influencing guiding behavior.
Innovation Solution
A vibration damper is integrated into the annular space between the outer and inner tubes of the drill pipe, supporting them against each other and providing prestress through elastic deformation, allowing for effective vibration compensation without altering the drill pipe's outer contour or interfering with coolant/lubricant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vibration damper is provided on the outside of the drill pipe, then vibrations are reduced, but handling becomes more difficult and drilling depth is reduced
Solution Approach 1:
The vibration damper is nested within the annular space between the outer tube and inner tube of the drill pipe, rather than being mounted on the outside. This internal placement eliminates the need for external attachments that would interfere with handling and drilling depth while still providing effective vibration damping through the elastic element positioned between the two tubes.
2Object-affected harmful factors
If a vibration damper is provided on the outside of the drill pipe, then vibrations are reduced, but the achievable drilling depth is reduced
Solution Approach 1:
By nesting the vibration damper within the existing annular space between the outer tube and inner tube, the solution eliminates external attachments that would reduce the effective drilling depth. The elastic vibration damping element is positioned internally, allowing the drill pipe to maintain its full length and reach greater depths while still providing vibration compensation.
3Object-affected harmful factors
If a vibration damper is provided on the outside of the drill pipe, then vibrations are reduced, but the structural design becomes more complex
Solution Approach 1:
The annular space between the outer tube and inner tube serves multiple functions: it allows coolant/lubricant flow to the drill head and simultaneously accommodates the vibration damper. By utilizing this existing space for dual purposes, the invention avoids adding separate external vibration damping structures, thereby maintaining structural simplicity while providing effective vibration compensation.
4Object-affected harmful factors
If a vibration damper is provided on the outside of the drill pipe, then vibrations are reduced, but the contact precision with the drill pipe must be particularly precise
Solution Approach 1:
The vibration damper is nested within the annular space between the outer tube and inner tube, where it can elastically deform to accommodate manufacturing tolerances and thermal expansion without requiring precise external contact surfaces. The elastic element naturally compensates for dimensional variations, eliminating the need for high-precision contact surfaces that would be required for external vibration dampers.
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 reduces unwanted vibrations, enhances machining accuracy, and simplifies tool handling and design, while allowing for flexible adjustment of damping parameters and improved stability, leading to reduced noise emission and increased drilling precision.
Implementation Method 1
The mutual bracing of the outer and inner tubes can be achieved in a structurally simple manner if the vibration damper braces the outer and inner tubes against one another due to its elastic deformation.
Implementation Method 2
If the vibration damper is designed as a sleeve that rests against the drill head of the drill pipe
Data Source
Figure 1
Figure 2
AI summary
An ejector deep drilling tool (1) is shown, comprising a drill head (2), a drill tube (3) supporting the drill head (2), and an outer tube (8) and an inner tube (9) for guiding coolant/lubricant (7). These inner tubes form an annular space (10) between them for supplying and guiding the coolant/lubricant (7) to the drill head (2) of the ejector deep drilling tool (1). The tool also includes at least one vibration damper (12) acting on the outer tube (8). To ensure low vibration and high machining precision, it is proposed that the vibration damper (12) be located in the annular space (10) between the outer and inner tubes (8, 9), which is designed for supplying and guiding the coolant/lubricant (7) to the drill head (2) of the ejector deep drilling tool (1), and that the damper supports these two tubes against each other.