Drill Thinning Geometry for Smooth Swarf Discharge
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Solution Overview
Problem
Existing drills experience increased thrust resistance and abnormal wear due to inefficient swarf splitting and discharge, leading to chipping and reduced tool life.
Innovation Solution
The drill design includes specific geometric configurations such as main blades, thinning blades, thinning back portions, and oil holes, with defined numerical ranges for radii, separation amounts, and discharge distances to facilitate smooth swarf splitting and discharge, reducing thrust resistance and enhancing rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thinning blade geometry is not optimized, then the swarf is not properly split and discharged, but the thrust resistance increases and abnormal wear or chipping of the drill occurs
Solution Approach 1:
The patent applies parameter changes by optimizing the thinning blade geometry with specific numerical ranges: the first radius ranges from 0.5×f to 1.2×f where f is the center core advancing amount, the second radius ranges from 5.5 mm to 7.5 mm, the thinning separation amount ranges from 0.5 mm to 1.2 mm, and the thinning-oil hole distance ranges from 0.1 mm to 0.8 mm. These parameter optimizations enable proper swarf splitting and discharge while preventing thrust resistance increase and abnormal wear, thereby resolving the contradiction between productivity and reliability.
2Productivity
If the chisel center portion rigidity is insufficient, then the drill may experience abnormal wear and chipping, but excessive material removal at the center reduces swarf discharge efficiency
Solution Approach 1:
The patent applies local quality by differentiating the geometry of the thinning blade into two distinct radius zones: a first radius (0.5×f to 1.2×f) at the thinning bottom for effective swarf splitting, and a second radius (5.5 mm to 7.5 mm) at the thinning back portion for maintaining chisel center rigidity. This localized geometric differentiation allows the thinning portion to simultaneously achieve good swarf discharge efficiency and maintain sufficient structural strength at the chisel center.
Data Source
AI summary
The drill includes a main blade having a wicking amount, a thinning blade, a thinning back portion, and an oil hole. The thinning bottom is along the first radius. The thinning back portion is along the second radius. The pair of thinning bottoms includes a thinning separation amount. (1) The first radius for the wicking amount ranges from 0.5×f to 1.2×f, and f represents the wicking amount. (2) The second radius ranges from 5.5 mm to 7.5 mm. (3) The thinning separation amount ranges from 0.5 mm to 1.2 mm. (4) The thinning-oil hole distance ranges from 0.1 mm to 0.8 mm (5) The thinning range from the first thinning end to the second thinning end is in the range from (D/2−1.5 mm) to (D/2−0.2 mm) with respect to the diameter, and D represents the diameter.