Spiral Drill Guide Ring Geometry for Chip-Free Bore Guidance
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Solution Overview
Problem
Existing drilling tools with guide rings suffer from chip entrapment between the cutter and the drill hole, leading to incomplete cuts and increased friction, and internal cooling channels often result in inefficient coolant delivery.
Innovation Solution
The drilling tool features guide rings with a chamfer parallel to the helix angle, spaced by a groove for coolant delivery, and an internal cooling channel following the helix angle, ensuring effective chip removal and reduced friction by preventing chip entrapment and optimizing coolant transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If guide rings are formed on the cutting edge, then guidance of the drill bit is improved, but chip entrapment between the cutting edge and the borehole occurs
Solution Approach 1:
The guide chamfer is segmented into discrete ring segments rather than forming continuous guide rings. This segmentation prevents chips from being trapped along the entire cutting edge by creating gaps between the ring segments, while still providing guidance functionality where needed.
Solution Approach 2:
The guide chamfer is applied locally at specific positions along the cutting edge rather than continuously. The ring segments are positioned to provide guidance where needed while leaving other areas open for chip evacuation, creating different functional zones along the cutting edge.
2Ease of operation
If guide rings extend to the secondary cutting edge, then guidance is improved, but the secondary cutting edge develops a toothed contour
Solution Approach 1:
The guide chamfer is segmented into ring segments that are positioned to provide guidance without extending to the secondary cutting edge. This prevents the formation of a toothed contour on the secondary cutting edge while maintaining guidance functionality through the segmented structure.
Solution Approach 2:
The guide chamfer function is extracted from the secondary cutting edge area. By positioning the ring segments to not engage the secondary cutting edge, the harmful toothed contour formation is prevented while the guidance function is maintained in the primary cutting zone.
3Temperature
If internal cooling channels are added, then coolant delivery is improved, but device complexity increases
Solution Approach 1:
The existing flute structure of the drill bit is made multi-functional by configuring it to serve as the coolant delivery channel. This eliminates the need for separate internal cooling channels while maintaining effective coolant delivery to the cutting zone, as the flutes already provide a pathway for coolant flow.
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 enhances the cutting process with a cleaner finish, reduced friction, and improved coolant delivery, resulting in better guidance and lubrication, particularly at the working end of the drill.
Implementation Method 1
such a groove allows coolant or lubricant to be transported from the drill head to the guide rings. This reduces friction of the drill bit in a borehole.
Implementation Method 2
the coolant or lubricant tends to be held in a front (working-side) area of the drill bit, where good cooling and lubrication are particularly important.
Data Source
Figure 1~5
AI summary
The invention relates to a drilling tool (1), in particular a spiral drill, comprising the following: a drill longitudinal axis (L); at least two flutes (2) which run in a twisted manner at an angle of twist (α) relative to the drill longitudinal axis (L); webs (3) formed between the flutes (2); and cutting backs (4) which are formed on a lateral surface of the webs (3) and on which guide rings (5) are formed that run at an angle (ß) relative to the drill longitudinal axis (L) at least in some sections, said angle deviating from the angle of twist (α), wherein at least one guide bevel (6) which runs parallel to the angle of twist (α) and in front of the guide rings (5) with respect to the rotational direction (R) of the drilling tool (1) is formed on at least one cutting back (4) in addition to the guide rings (5).