Spiral Drill Guide Chamfer for Chip-Free Hole Guidance
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Solution Overview
Problem
Existing drilling tools face issues with chip entrapment between the land and the drilled hole due to guide rings extending beyond the secondary cutting edge, leading to a toothed contour and reduced cut quality, and high friction during drilling.
Innovation Solution
Incorporating a guide chamfer parallel to the twist angle in front of the guide rings, along with a groove for coolant/lubricant transport, prevents chip entrapment and reduces friction by maintaining a smooth cutting edge and efficient lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If guide rings extend as far as the secondary cutting edge, then guidance of the drilling tool is improved, but the secondary cutting edge develops a toothed contour that degrades cut quality
Solution Approach 1:
The patent segments the guide ring structure by introducing a groove that divides the guide ring into distinct sections. This segmentation allows the guide ring to provide guidance functionality while preventing the continuous toothed contour that degrades cut quality. The groove creates a discontinuity that eliminates the harmful toothed effect on the secondary cutting edge.
Solution Approach 2:
The patent extracts or removes the harmful toothed contour effect by positioning the guide ring such that it does not extend continuously to the secondary cutting edge. The groove effectively 'takes out' the problematic continuous contact area, allowing guidance functionality to be maintained while eliminating the source of poor cut quality.
2Ease of operation
If guide rings are formed on the land, then guidance is provided, but chips are drawn in between the land and drilled hole
Solution Approach 1:
The groove segments the guide ring structure, creating discrete sections rather than a continuous ring. This segmentation prevents chips from being drawn into a continuous gap between the land and drilled hole, as the groove interrupts the chip flow path and prevents entrapment.
Solution Approach 2:
The groove acts as an intermediary element between the guide ring and the chip flow. It provides a pathway that prevents chips from being drawn into the harmful space between the land and drilled hole, mediating the interaction between the guide ring structure and chip ejection.
3Ease of manufacture
If the guide rings extend parallel to the twist angle, then manufacturing is simplified, but friction during drilling increases
Solution Approach 1:
The patent applies local quality by varying the angle of the guide ring sections created by the groove. Different sections of the guide ring can have different angles optimized for their specific functions: some sections provide guidance while others minimize friction. This allows the structure to be manufactured simply while reducing overall friction through localized angle optimization.
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
The solution prevents chip entrapment, enhances cut quality by maintaining a smooth edge, and reduces friction during drilling by ensuring effective coolant/lubricant delivery to the guide rings, resulting in improved drilling efficiency and reduced tool wear.
Implementation Method 1
the groove creates the possibility of transporting coolant and/or lubricant from a drill head to the guide rings. This brings about reduced friction of the drilling tool in a drilled hole.
Implementation Method 2
Since at least one guide chamfer extending parallel to the twist angle and in front of the guide rings with respect to the direction of rotation of the drilling tool is formed on at least one land, in addition to the guide rings, chips are prevented from being drawn in between the land and drilled hole.
Implementation Method 3
the guide rings do not enter into cutting engagement. As a result of the secondary cutting edge not being toothed according to the invention, a smooth cut takes place.
Data Source
AI summary
A drilling tool, in particular a spiral drill, has a drill longitudinal axis, at least two flutes extending at a twist angle with respect to the drill longitudinal axis, webs formed between the flutes, and lands formed on a lateral surface of the webs. Guide rings are at least partially formed on the lands. The guide rings extend at an angle different from the twist angle to the drill longitudinal axis. At least one guide chamfer is formed on at least one land in addition to the guide rings. The guide chamfer extends parallel to the twist angle and in front of the guide rings with respect to the direction of rotation of the drilling tool.