Pivoting Drill Head for Large Non-Cylindrical Chambering
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Solution Overview
Problem
Existing drill heads for chambering non-cylindrical inner contours are limited by a small ratio between the maximum diameter of the chamber and the guide hole, restricting the size of the chamber that can be produced and requiring multiple tools for different diameters, which increases costs and complexity.
Innovation Solution
A drill head design featuring pivotable insert holders coupled via a cam mechanism with slotted links, allowing for a larger pivot range and a greater ratio between the maximum chamber diameter and guide hole diameter, along with a compact and robust construction for increased cutting capacity and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing drill heads with limited pivot range are used, then the device complexity is reduced, but the ratio between maximum chamber diameter and guide hole diameter is limited
Solution Approach 1:
The insert holders are designed to be pivotable rather than fixed, allowing dynamic adjustment of the cutting radius. The pivotable insert holders with cam mechanism enable the drill head to adapt to different chamber sizes by varying the pivot angle, thereby achieving a larger ratio between maximum chamber diameter and guide hole diameter while managing device complexity through controlled mobility.
Solution Approach 2:
The drill head is divided into modular components including insert holders, cam mechanism, and guide pads that can independently function. This segmentation allows each component to be optimized for its specific function while working together to achieve the overall goal of increasing the chamber diameter ratio without proportionally increasing overall device complexity.
2Volume of moving object
If a larger pivot range is implemented, then the maximum chamber diameter increases, but the manufacturing precision requirements increase
Solution Approach 1:
The cam mechanism replaces complex multi-component actuation systems with a simpler cam-follower arrangement. This mechanical substitution maintains manufacturing precision by providing controlled, repeatable motion paths for the insert holders while enabling a larger pivot range, thus increasing maximum chamber diameter without proportionally increasing precision requirements.
Solution Approach 2:
The cam mechanism acts as an intermediary between the actuating force and the insert holder positioning. It transforms simple linear or rotational input motion into the desired arc-shaped path of the insert holders, maintaining manufacturing precision through the geometric constraints of the cam profile while enabling a larger pivot range for increased chamber diameter.
3Manufacturing precision
If multiple tools are used for different diameters, then the manufacturing precision for each specific diameter is optimized, but the productivity decreases
Solution Approach 1:
The drill head is designed with universal insert holders that can accommodate different cutting insert configurations through pivoting. This multi-functionality allows a single drill head to produce chambers of various diameters by adjusting the pivot angle, eliminating the need for multiple specialized tools while maintaining manufacturing precision through controlled positioning, thereby significantly improving productivity.
4Strength
If the drill head structure is made more robust for increased cutting capacity, then the strength increases, but the ease of operation decreases
Solution Approach 1:
The robust drill head structure incorporates dynamic pivotable insert holders that can adjust their position during operation. This dynamic capability maintains ease of operation by allowing adaptation to different workpiece geometries and cutting conditions, while the overall robust construction ensures sufficient strength for increased cutting capacity through rigid mounting and stable cam 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 drill head achieves a significantly larger ratio between the maximum chamber diameter and guide hole diameter, enabling the production of larger chambers with reduced machining time and costs, while maintaining reliability and long service life, and can be adapted for various guide hole diameters with a single tool.
Implementation Method 1
the insert holders and an advancing element being coupled to one another via a link motion in such a way that a movement of the advancing element in the axial direction relative to the body triggers a pivoting movement of the insert holders
Implementation Method 2
a pin and optionally a roller are provided at rear ends of the insert holders, in that the pin or the roller of a first insert holder interacts with the first slotted link of the advancing element, and in that the pin or the roller of the second insert holder interacts with the second slotted link of the advancing element
Data Source
AI summary
The invention relates to a drill head for chambering non-cylindrical, rotationally symmetrical holes. This drill head is characterized in that, starting from a diameter of a guide hole, it can cut a very large chamber out of a workpiece. In addition, the drill head has a simple design and is very robust and tight, so that high cutting capacities can be reliably achieved.