Drill Bit Shank Contour for Wear-Resistant Torque Transfer
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Solution Overview
Problem
Existing drilling devices experience rapid wear and torque transmission issues due to the design of the securing region and receiving region, leading to potential damage during drilling operations.
Innovation Solution
A corner-less and edge-less securing contour design for the drill bit and drill bit fitting, where shank arc segments and connecting segments merge tangentially, enhancing torque transmission while simplifying production and reducing wear, along with a positive axial securing means and drill bit stops for improved handling and secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional securing region with intersecting shank arc segments and shank connecting segments is used, then the drill bit can be secured against rotation, but the securing region and receiving region wear out quickly due to corners and edges concentrating stress
Solution Approach 1:
The shank connecting segments are designed to merge tangentially with the shank arc segments, creating a corner-less and edge-less securing contour. This curvature eliminates stress concentration points that would otherwise occur at sharp corners, thereby reducing wear and damage to the securing region and receiving region during drilling operations.
2Reliability
If additional elements for securing against rotation are added to the drill bit, then rotation security is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The rotational securing function is integrated directly into the shank geometry itself, merging the securing contour with the basic shank structure. This eliminates the need for separate securing elements such as keys, splines, or special profiles, thereby maintaining rotation security while keeping the device simple and easy to manufacture.
3Reliability
If a corner-less and edge-less securing contour is implemented, then torque transmission is improved and wear is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The tangential merging of shank connecting segments with shank arc segments creates a smooth, continuous curvature that improves torque transmission and reduces stress concentration. While this does require precise manufacturing, the corner-less design eliminates the need for complex multi-feature machining, potentially simplifying the overall manufacturing process while maintaining high precision where needed.
Data Source
AI summary
A drilling device, wherein the drilling device has a drill bit fitting and a drill bit, wherein the drill bit fitting has a connection region for connection of the drilling device to a power drill, and a receiving region for receiving the drill bit, wherein the drill bit has a shank, which is received by the receiving region, in the fitted state and is fixed releasably in the axial direction by an axial drill bit securing means, wherein the shank has a securing region, wherein the securing region secures the drill bit against rotation relative to the drill bit fitting in the fitted state, wherein the securing region has a securing contour along its length, wherein the securing contour has a plurality of curved shank arc segments and a plurality of shank connecting segments, which connect the shank arc segments to one another at a plurality of shank connection points.