Segmented Twist Drill Structure for Precise Low-Force Drilling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional twist drills face challenges in positioning drill holes efficiently and are limited by low speed and efficiency, especially when used with hand-held electric tools, due to arm strength and power constraints.
Innovation Solution
The twist drill design features a shank portion connected to an operation portion with a cone and cylinder structure, equipped with a spiral flute for chip removal and composite cutting blade groups with increasing diameters, along with a top blade for positioning, which disperses cutting force and reduces reaction forces on cutting edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two symmetrically distributed linear cutting edges are used to complete metal cutting, then the cutting function is achieved, but relatively large power is required and reaction forces damage the cutting edges
Solution Approach 1:
The single cutting edge is segmented into multiple cutting blades arranged in a specific pattern. Instead of relying on two linear cutting edges, the patent employs multiple discrete cutting blades that divide the cutting task, reducing the power and force burden on each individual blade while maintaining effective metal removal.
Solution Approach 2:
The patent transitions from symmetrically distributed linear cutting edges to an asymmetric arrangement of multiple cutting blades. The blades are positioned at different angles and locations around the drill body, creating an asymmetric configuration that optimizes force distribution and cutting efficiency while reducing reaction forces on any single blade.
2Productivity
If two symmetrically distributed linear cutting edges are used, then cutting is achieved, but cutting edges are easy to be damaged due to large reaction forces
Solution Approach 1:
By segmenting the cutting function across multiple blades rather than concentrating it on two linear edges, the reaction forces are distributed throughout the structure. This segmentation prevents any single cutting edge from bearing excessive load, thereby reducing damage risk and improving reliability.
Solution Approach 2:
Each cutting blade is designed with specific local characteristics optimized for its position and function. The blades may have varying geometries, angles, and material properties tailored to their specific cutting zones, allowing each blade to handle reaction forces more effectively and reducing overall susceptibility to damage.
3Productivity
If conventional twist drill structure is used, then basic drilling function is achieved, but positioning of drill hole is difficult
Solution Approach 1:
The drill incorporates preliminary positioning features such as guide edges, centering elements, or marked alignment indicators that enable accurate positioning before the actual cutting action begins. This preliminary action ensures the drill is correctly positioned on the workpiece, facilitating precise hole placement while maintaining efficient drilling operation.
Data Source
AI summary
The present invention provides a twist drill. A cone portion is provided at a front end of the operating portion, and an exterior surface of the operating portion is provided with a spiral flute for shunting cutting chips. The exterior surface of the cone portion is provided with a plurality of composite cutting blade groups which are sequentially enlarged in diameter from the front end to the rear end of the cone portion. The cone portion is provided with a top blade on the tip. In use, the top blade is used for positioning, and the cutting process is carried out by the top blade and the composite cutting blade groups.