Flat Drill Groove Angle Optimization for Wood Debris Removal
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Solution Overview
Problem
Existing flat drills are inefficient in drilling speed due to the design of the grooves, which affects the removal of wood debris and leads to blockages, limiting their effectiveness in woodworking applications.
Innovation Solution
A flat drill design featuring a handle part with a flat blade part having inwardly extending shoulders that taper upward, forming tapered parts and grooves with specific angles to enhance the removal of wood debris, including a first groove with an inner edge inclined at an angle greater than 0 degrees and a second groove on the tapered part, optimizing the shape for faster drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the groove inner edge is parallel to the horizontal shoulder (0 degree angle), then the structure is simple and easy to manufacture, but the drilling speed is low due to poor wood debris removal
Solution Approach 1:
The patent changes the geometric parameter of the groove inner edge angle from 0 degrees (parallel to shoulder) to a specific range of 15-30 degrees. This parameter modification optimizes the wood debris removal efficiency while maintaining manufacturing feasibility, directly resolving the contradiction between drilling speed and structural complexity.
Solution Approach 2:
The patent applies different angle requirements to different parts of the groove structure. The inner edge angle is specifically optimized to 15-30 degrees while other groove dimensions maintain standard configurations. This localized optimization improves drilling performance without significantly increasing overall device complexity.
2Productivity
If the groove inner edge angle is increased to improve drilling speed, then wood debris removal is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a practical angle range of 15-30 degrees for the groove inner edge, which balances performance optimization with manufacturing capability. This parameter selection avoids extreme values that would require excessive precision while still achieving significant improvement in drilling speed.
Solution Approach 2:
The patent adopts a moderate angle range (15-30 degrees) rather than maximizing the angle to extreme values. This partial optimization approach achieves sufficient improvement in wood debris removal without imposing overly stringent manufacturing precision requirements.
3Productivity
If the groove design is optimized for faster debris removal, then drilling efficiency increases, but the energy consumption increases
Solution Approach 1:
The optimized groove angle of 15-30 degrees creates a more efficient chip ejection path, reducing the resistance against which the drill must work. Although the groove geometry is more complex, the reduced friction and improved material flow actually decrease the energy required for drilling compared to the parallel groove design.
Data Source
AI summary
A flat drill having a handle, and a flat blade formed in the front portion of the handle part. A front portion of the flat blade extends inwardly from the two sides, forming first and second shoulder. The two shoulders continuing to extend and taper inward and upward, forming two tapered sections respectively, a first tapered section and a second tapered section, and having a pointed top. A first groove is formed on a blade part of the first shoulder toward the inside of the flat blade part. The inner edge of the first groove is inclined downward towards outside direction of the first shoulder, forming an angle of greater than 0 degree with respect to a horizontal line of the flat drill.