Spade Bit Curved Flute Chip Removal
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Solution Overview
Problem
Conventional spade bits experience reduced drilling rates and increased energy consumption due to the inefficient removal of chips, which are trapped and swirled within the bore, leading to slower drilling and shorter battery life in battery-powered drills.
Innovation Solution
The drill bit features a cutting blade with inwardly extending shoulders, a beveled cutting edge, and smooth curved flutes that facilitate chip removal, allowing chips to exit parallel to the drill axis, reducing power consumption and increasing drilling speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional spade bits with planar flute surfaces meeting at sharp angles are used, then the structure is simple and easy to manufacture, but chips are trapped and swirled in the bore, reducing drilling rate and increasing energy consumption
Solution Approach 1:
The patent applies curvature by replacing the conventional planar flute surfaces with a curved surface that extends from the cutting edge to the blade face. This curved surface allows chips to flow smoothly along the flute path and exit the bore parallel to the drill axis, eliminating the trapping and swirling of chips that occurs with sharp-angled planar surfaces. The curved geometry optimizes chip evacuation while maintaining structural integrity.
Solution Approach 2:
The patent changes the geometric parameters of the flute surface from planar with sharp angles to a curved profile with specific radius of curvature. This parameter change transforms the chip flow path, enabling efficient chip removal and reducing the energy required for drilling while increasing the drilling rate.
2Productivity
If conventional spade bits are used, then the blade structure is simple, but chips are not efficiently removed, requiring additional energy to move chips and slowing drilling rate
Solution Approach 1:
The curved surface of the flute minimizes resistance to chip flow and eliminates the need for the blade to mechanically move chips through swirling motion. Chips naturally follow the curved path and exit efficiently, reducing energy loss and increasing productivity.
Data Source
AI summary
The drill bit comprises a cutting blade formed at one end of a shank. The cutting blade has a pair of cutting shoulders that extend inwardly from the outer sides of the blade toward the bit axis. A tip having converging sides that create a point extends from the shoulders. The cutting edge of each shoulder is beveled with respect to the plane of the face of the blade. A flute is provided on the leading portion of each blade face adjacent the cutting edges. Each flute is a smooth curve that creates a substantially uninterrupted recess on each face of the blade that facilitates chip removal, increases the drill rate and lowers the power required to drill a hole. A non-stick coating may be applied to the blade to further facilitate chip removal.