Twist Drill Sharpening Device with Adjustable Guide Member
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Solution Overview
Problem
Conventional methods for sharpening twist drills are complex, require expert skills, and are costly, limiting their accessibility and effectiveness, especially for achieving optimal four facet sharpening which provides superior cutting conditions.
Innovation Solution
A device using a rotating grindstone in a grinding machine with a drill holder and guide member system that allows for adjustable point angles and clearance angles, enabling both cone envelope and four facet sharpening without requiring specialized expertise, adaptable for drill diameters between 3.5 and 20 mm and materials like HSS and tungsten carbide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional sharpening methods are used, then expert skills and complex procedures are required, but this increases device complexity and reduces ease of operation
Solution Approach 1:
The device is divided into distinct functional modules: a drill holder for securing the drill, a guide member with adjustable guide surfaces for positioning, and a grinding wheel. This segmentation allows each component to perform its specific function independently, simplifying the overall operation while maintaining precision for achieving four facet sharpening.
Solution Approach 2:
The guide member acts as an intermediary between the drill holder and the grinding wheel. It provides adjustable guide surfaces that control the drill's positioning and movement, enabling precise angle control without requiring the operator to have expert skills. The guide member mediates the interaction between the drill and grindstone, simplifying the sharpening process.
2Productivity
If four facet sharpening is achieved, then cutting performance and drilling speed improve, but the sharpening process becomes more complex
Solution Approach 1:
The guide member features adjustable guide surfaces that can be positioned at different angles to create the four facet geometry. The adjustability allows the device to dynamically adapt to create the complex four facet shape, while the mechanism itself remains relatively simple. This enables high productivity through four facet sharpening without proportionally increasing device complexity.
3Adaptability or versatility
If adjustable point angles are provided, then adaptability to different drill requirements improves, but device complexity increases
Solution Approach 1:
The guide member is designed with adjustable guide surfaces that can be positioned at various angles, allowing the same device to accommodate different point angle requirements for various drill applications. This multi-functionality provides adaptability without requiring multiple separate devices, effectively managing complexity while enhancing versatility.
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 device allows for efficient sharpening of twist drills to a four facet point, improving cutting performance by reducing thrust and heat, extending drill life, and enabling faster drilling with precise bore diameters, outperforming conventional drills by drilling holes more than twice as fast.
Implementation Method 1
sharpening a twist drill point by means of a rotating grindstone in a grinding machine
Data Source
Figure 1~5
Figure 6~9
Figure 10~12
AI summary
A device for sharpening a twist drill pointby means of a rotating grindstone (12) in a grinding machine comprises a base plate (14) lockably articulated around an axis parallel with the axis of the grindstone (12), a drill holder (16) for releasably holding a twist drill (1) to be sharpened, and a guide member (15). The guide member has a back plate (21) and a front plate (22), lockably rotatable in relation to each other. The back plate (21) is connected to the base plate (14) for movements in the direction of the grindstone axis, and the front plate (22) has guide means (28, 29) for slidably guiding the drill holder (16) in the general direction towards and away from the grindstone (12).