Drill Bit Slug Separation via Shearing Jaws
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Solution Overview
Problem
Current methods for producing drill bits with integrated slugs result in a burr formation along the cutting edges, leading to increased screwing times due to a ridged interface and deformation at the separation point, which affects the drill bit's performance.
Innovation Solution
The method involves separating the slug from the drill bit along the cutting edges using pinching jaws with shearing edges, ensuring the cutting edges remain burr-free while the slug is connected to the axial long sides via a predetermined breaking point, allowing for a smooth separation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the slug is connected to the drill bit by a separation point with thin material for easy separation, then the slug can be separated by rotary movement after ejection, but a burr of 0.1 mm to 0.2 mm remains on the cutting edge, deteriorating drill bit performance and lengthening screwing times
Solution Approach 1:
The harmful burr formation is eliminated by extracting the separation process from the rotary movement stage and performing it during the pinching operation itself. The separation point is strategically positioned away from the cutting edges, so the slug is removed cleanly without affecting cutting edge quality.
Solution Approach 2:
A specifically designed separation point acts as an intermediary element between the slug and drill bit. This separation point is positioned on the longitudinal edges away from cutting edges, serving as a predetermined weak point that allows easy slug removal without creating burrs on the cutting surfaces.
2Reliability
If the slug remains attached to the drill bit after ejection to protect it, then the drill bit is protected during handling, but a ridged interface is created at the separation point that increases screwing times
Solution Approach 1:
The potential harm of a ridged interface is converted into a benefit by strategically positioning the separation point away from cutting edges. The ridge forms only on longitudinal edges where it does not interfere with drilling performance, while the cutting edges remain smooth and effective.
3Manufacturing precision
If the boundary between recess and receiving space is designed to touch when jaws are closed, then complete material separation occurs, but the cutting edges become burr-free only at the cost of creating a ridged interface on longitudinal edges
Solution Approach 1:
Different regions of the drill bit are treated differently regarding separation. The cutting edges are protected from separation by positioning the separation point away from them, while the longitudinal edges are designed with the separation point to allow slug removal. This local differentiation ensures cutting edges remain smooth without compromising slug separation.
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 approach enhances screwing efficiency by maintaining the integrity of the cutting edges, reducing burr formation, and facilitating easier slug separation, thereby shortening screwing times and improving drill bit performance.
Implementation Method 1
The material displaced in the process forms a slug
Implementation Method 2
a further development of the invention can provide for shearing to take place there
Data Source
Figure 1~2
Figure 3~4
AI summary
The method involves positioning a wire nail (7) with an end (8) in an intermediate space between two spaced-apart pinching jaws. A drilling tip is formed between the pinching jaws when the pinching jaws are closed. An excess material is displaced into a bulge (11) surrounding the end of the wire nail, where the bulge is deformed at longitudinal sides of the wire nail in order to form a predetermined breaking point. The bulge is separated from the wire nail along cutting edges (10) of the drilling tip. The bulge is sheared off from the wire nail after the drilling tip is removed. Independent claims are also included for the following: (1) a screw with a drilling tip (2) a pair of pinching jaws for manufacturing a drilling tip.