Three-Flute Drill Gash Structure for Stable Chip Discharge
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Solution Overview
Problem
Existing drills experience poor chip discharge performance, leading to clogging, increased cutting resistance, and reduced drill lifetime due to chips flowing to the outer peripheral side, resulting in unstable curling and incomplete division of chips.
Innovation Solution
A drill design featuring helical discharge grooves, a thinning edge, and a gash portion with an R portion and a straight portion, where the straight portion connects to the discharge groove further inward than the outer peripheral surface, enhancing chip curling and directing chips smoothly into the discharge groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the R gash extends in a circular arc shape from the thinning edge toward the outer peripheral surface, then the chip curling is weakened, but the discharge performance of chips deteriorates and clogging occurs
Solution Approach 1:
The gash portion is divided into two distinct segments: an R portion with a curved ridge line that enhances chip curling, and a straight portion with a linear ridge line that directs chips toward the discharge groove. This segmentation allows each portion to perform its specific function optimally without interfering with the other.
Solution Approach 2:
The R portion of the gash features a curved ridge line that follows a circular arc pattern, which effectively guides and curls the chips during the machining process. This curvature is essential for initiating and maintaining proper chip formation.
2Device complexity
If the R gash connects to the discharge groove at the outer peripheral surface, then the structure is simplified, but chips flow to the outer peripheral side causing unstable curling and increased cutting resistance
Solution Approach 1:
The straight portion of the gash extends the ridge line further inward in the radial direction, connecting to the discharge groove at a position deeper than the outer peripheral surface. This dimensional extension ensures that chips are directed along a controlled path toward the discharge groove rather than flowing outward.
3Ease of manufacture
If chips are not finely divided, then the cutting process is simpler, but clogging and vibration occur reducing drill lifetime
Solution Approach 1:
The gash portion is divided into two distinct segments: an R portion with a curved ridge line that enhances chip curling, and a straight portion with a linear ridge line that directs chips toward the discharge groove. This segmentation allows each portion to perform its specific function optimally without interfering with the other.
Data Source
AI summary
A three-flute drill includes a body, discharge grooves, cutting edges, thinning edges and gash portions. The discharge grooves are provided in an outer peripheral surface of the body. The cutting edges are provided on ridge sections between inner faces of the discharge grooves and flanks of the body. The thinning edge extends from an end of the cutting edge toward a radially inner side. The gash portion includes an R portion and a straight portion. A first ridge line between the R portion and the flank extends while curving toward a rotation direction, from an end of the thinning edge toward a radially outer side. A second ridge line between the straight portion and the flank extends linearly from an end of the first ridge line toward the radially outer side, and connects to the discharge groove further to the radially inner side than the outer peripheral surface.