Single-Lip Deep Hole Drill Curved Cutting Edge
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Solution Overview
Problem
Existing single-lip deep-hole drills experience reduced chip formation quality and reliability at higher feed rates, leading to chip jamming and potential drill breakage due to the formation of long chips, which can render the workpiece unusable.
Innovation Solution
The single-lip deep-hole drill features a cutting edge with an outwardly curved outer cutting area, implemented as a groove or step, which divides the cutting edge into inner and outer areas, ensuring short-breaking chips are produced, and the chip breaker design limits chip width and length, facilitating reliable removal through the coolant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional single-lip deep-hole drill with a straight cutting edge is used, then the drill structure is simple and easy to manufacture, but at higher feed rates the chip formation quality deteriorates leading to long chips that jam and cause drill breakage
Solution Approach 1:
The cutting edge is designed with a curved outer cutting area instead of a straight line. This curvature modifies the chip flow path and cutting mechanics, enabling effective chip breaking at higher feed rates while maintaining reliable chip removal through the coolant system.
Solution Approach 2:
The cutting edge is divided into distinct inner and outer cutting areas by a chip breaker groove or step. This segmentation allows each area to perform different functions: the inner area for primary cutting and the outer area for chip control and breaking, improving chip formation quality at high feed rates.
2Productivity
If the feed rate is increased to improve productivity, then production speed increases, but chip formation quality deteriorates causing long chips that can jam between the bore wall and chip removal groove
Solution Approach 1:
The curved outer cutting area modifies chip flow dynamics and breaking characteristics, preventing long chip formation even at high feed rates. This curvature ensures chips break into manageable sizes that can be reliably flushed through the chip removal groove without jamming.
Solution Approach 2:
The cutting edge geometry parameters are changed from a straight line to a curved profile with specific radii. This parameter change fundamentally alters the cutting mechanics and chip formation process, enabling high feed rate operation without chip jamming issues.
3Reliability
If a chip breaker is added to improve chip breaking, then chip formation improves, but the drill structure becomes more complex
Solution Approach 1:
The cutting edge is segmented into inner and outer areas using a groove or step feature. This segmentation provides effective chip breaking functionality while maintaining a relatively simple overall structure that integrates seamlessly with the drill body, avoiding excessive complexity.
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 allows for a significantly higher feed rate, up to three times that of conventional drills, ensuring reliable chip removal and preventing drill breakage, thus enhancing process reliability and avoiding workpiece destruction in industrial production.
Implementation Method 1
coolant is supplied under pressure through this channel, which emerges at the drill head and, in addition to cooling the drill head or the cutting edge, has the particular task of flushing out the chips produced during drilling through a V-shaped chip removal groove
Implementation Method 2
coolant is supplied under pressure through this channel, which emerges at the drill head and, in addition to cooling the drill head or the cutting edge
Data Source
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AI summary
The invention relates to a single-lip deep hole drill (20), which comprises a cutter (30) in which at least one chip divider (36, 80) is provided, which divides the cutter (30) in an inner cutter region (38) and at least one outer cutter region (40). The outer cutter region (40) has an outwardly curved contour. The single-lip deep hole drill (20) according to the invention results in advantageous chip forming, wherein narrow and short chips are created, which ensure reliable chip removal and enable a high feed rate of the single-lip deep hole drill (20) according to the invention.