Asymmetric Double-Edged Drill for Accurate Tip Attachment
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Solution Overview
Problem
Existing drills face difficulties in achieving both excellent drilling performance and easy attachment, with a risk of incorrect attachment direction due to symmetrical clamp receiving surfaces, leading to potential misalignment and inefficiency.
Innovation Solution
A double-edged drill design with asymmetric first and second side surfaces and constraining surfaces, providing 180-degree rotational symmetry and tilt directions, ensures stable cutting and easy attachment by minimizing cutting force influence on the holder, allowing for correct orientation during attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the clamp receiving surfaces are disposed point-symmetrically with respect to the axis, then the drill structure is simplified and manufacturing is easier, but the attachment direction cannot be determined and incorrect attachment may occur
Solution Approach 1:
The patent applies asymmetry by making the first side surface and second side surface different from each other. Specifically, the first side surface has a first inclination angle while the second side surface has a second inclination angle that is different from the first. This asymmetric design allows the attachment direction to be determined by the difference in inclination angles, preventing incorrect attachment while maintaining manufacturing simplicity through the overall symmetric structure of the drill bit.
2Manufacturing precision
If the side surfaces are made asymmetric to enable correct attachment orientation, then attachment accuracy is improved, but the structural symmetry and manufacturing simplicity are reduced
Solution Approach 1:
The patent applies local quality by making only the side surfaces asymmetric while keeping the overall drill bit structure symmetric. The first side surface and second side surface have different inclination angles, but this asymmetry is localized to specific surfaces rather than the entire structure. This allows attachment accuracy to be improved through the asymmetric side surfaces while maintaining manufacturing simplicity through the symmetric overall geometry of the drill bit body, flutes, and cutting edges.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(b)
AI summary
A drill according to an embodiment has a cutting tip and a holder located on a rear end portion side of the cutting tip. The cutting tip has a first cutting edge and a second cutting edge located away from each other at a front end portion thereof, a first flute and a second flute respectively extending from the first cutting edge and the second cutting edge toward the rear end portion, a first side surface and a second side surface respectively extending from the first flute and the second flute toward a front side in a rotation direction, and a first constraining surface and a second constraining surface respectively extending from the first side surface and the second side surface in a tilt direction with respect to the rotation direction. The first side surface and the second side surface are asymmetric with respect to a central axis, and the first constraining surface and the second constraining surface are point symmetric with respect to the central axis in a front end view.