Dovetail Drilling Tool Lateral Insertion Fixation
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Solution Overview
Problem
Existing drilling tools face challenges in exchanging cutting edges simply and achieving mechanical stability, limiting their versatility and effectiveness in metal machining.
Innovation Solution
A drilling tool design featuring a cutting element with a dovetail-shaped area that matches a dovetail recess on the holder, allowing lateral insertion and axial fixation via a screw connection, providing exclusive axial force through the dovetail geometry, which enables a conventional drill head connection without geometric limitations and enhances stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional clamping mechanism with multiple components is used to fix the cutting insert, then the cutting insert can be secured in the holder, but the structure becomes complex and mechanical stability is reduced
Solution Approach 1:
The patent combines the cutting insert and holder into a single integrated component with a unified body. The cutting insert is no longer a separate piece requiring complex clamping mechanisms, but is directly formed as part of the holder structure, eliminating the need for separate clamping elements and reducing overall structural complexity while maintaining mechanical stability
Solution Approach 2:
The holder is designed with a universal structure that integrates both the cutting insert function and the holder function into one component. The single body serves multiple purposes: it provides the cutting edges, the structural support, and the mounting interface, eliminating the need for separate clamping mechanisms and reducing the number of parts required
2Ease of operation
If the cutting element is designed with a dovetail-shaped area for lateral insertion, then the cutting edges can be easily exchanged, but additional positioning requirements are introduced
Solution Approach 1:
The dovetail-shaped area is designed with asymmetric geometry that allows lateral insertion of the cutting element into the holder. The asymmetric shape provides automatic positioning and orientation, ensuring the cutting edges are correctly aligned while enabling easy exchange by simply sliding the element laterally into place
3Manufacturing precision
If stop surfaces are formed on both sides of the dovetail extension, then precise positioning is achieved, but manufacturing complexity increases
Solution Approach 1:
The positioning function is segmented into two independent components: the dovetail-shaped area for lateral insertion and orientation, and the stop surfaces for axial positioning. This segmentation allows each feature to be optimized independently, with the stop surfaces providing precise axial positioning while the dovetail geometry handles lateral alignment, simplifying the overall manufacturing process
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 allows for easy exchange of cutting edges, maintains mechanical stability, and supports all common drill geometries, ensuring precise positioning and efficient coolant delivery while optimizing tool cost and wear resistance.
Implementation Method 1
the cutting element experiences a force in the axial direction when fixed by the screw connection
Data Source
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AI summary
A rotary-driven tool for cutting machining, in particular a drilling tool with a cutting body (2) and a holder (3) with a shaft piece is disclosed, with at least cutter (6) and a swallow-tail shaped region (10) on the cutting body (2) and a matching swallow-tail recess (13) on the holder (3), wherein the cutting body (2) and the matching swallow-tail recess (13) match each other such that the cutting body (2) can only be inserted in the holder (3) laterally to a longitudinal axis of the holder (3). In order to fix the cutting body (2), opposing flank sections (18, 19) of the swallow-tail recess (10), between which the swallow-tail shaped region (10) fits can be moved over each other by means of a screw connection (4) in the holder (3) and on fixing the cutting body (2) said body is subjected to a force on the axial direction by the screw connection (4). The invention is characterised in that the cutting body is a cutting head (2) and the axial force is exclusively generated by the swallow tail shaped region (10) in cooperation with the swallow tail recess (13) in the holder (3).