Cutting Tool with Opposing Grooves for Dual-Surface Chamfering
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Solution Overview
Problem
Conventional cutting tools face challenges in simultaneously smooth chamfering and deburring of both the rear and front surfaces of a workpiece, often resulting in damage to the workpiece and generation of new burrs due to perpendicular chamfering blades and twist directions that hinder chip discharge.
Innovation Solution
A cutting tool design featuring grooves and cutting edges twisted in opposite directions to the rotational direction for the rear surface and in the same direction for the front surface, allowing for efficient chip discharge and reduced force application, along with a tapered connection between the shank and neck to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a chamfering blade is formed substantially perpendicularly to the drill axis to enable rear surface chamfering, then chamfering of the rear surface can be performed, but a large force is applied to the workpiece in a right-angled direction which may damage the workpiece
Solution Approach 1:
The chamfering blade is designed with an asymmetric inclination angle (30°-60°) rather than a perpendicular configuration, creating an oblique cutting action that reduces the impact force on the workpiece while maintaining effective chamfering capability on the rear surface
Solution Approach 2:
The inclination angle of the chamfering blade is optimized within a specific range (30°-60°) to balance the cutting force and chamfering effectiveness, preventing workpiece damage while achieving the desired chamfer geometry
2Productivity
If the chamfering blade is formed perpendicularly to the axis for rear surface processing, then simultaneous chamfering of front and rear surfaces is enabled, but new burrs may occur as burrs are pulled substantially horizontally
Solution Approach 1:
The inclination angle of the chamfering blade (30°-60°) is optimized to control the direction of cutting force and chip flow, enabling burrs to be pulled along the inclined path rather than horizontally, thus preventing new burr formation while maintaining simultaneous processing capability
Solution Approach 2:
The oblique inclination creates a curved cutting path that guides chips and burrs smoothly along the blade surface, preventing abrupt horizontal pulling that generates new burrs
3Ease of manufacture
If grooves and cutting edges are twisted in the same direction as rotational direction for drilling, then chip discharge is facilitated, but chamfering of the rear surface becomes difficult when the chamfering blade is formed as an extension
Solution Approach 1:
The cutting tool is divided into functionally independent segments: the drill portion with right-handed twist for efficient chip discharge during drilling, and the chamfering blade with oblique inclination for effective rear surface chamfering, allowing each segment to optimize its specific function without interfering with the other
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
Provided is a cutting tool that enables smooth cutting on both front and rear surfaces. In a cutting tool 10 that includes a blade portion 14 inserted from one side of a through hole formed in a workpiece, for processing a circumference of the through hole on the other side of the workpiece while being rotated, and a neck portion 13 connected with the blade portion 14 and having an outer diameter smaller than an outer diameter of the blade portion 14, a neck portion 13 side of the blade portion 14 includes at least one first groove 16 twisted in a direction opposite to a direction of the rotation, and a first cutting edge 17 extending along the first groove 16 of the blade portion 14, and the neck portion 13 side of the blade portion 14 is provided with a first cutting portion 18 for processing the workpiece. In addition, a tip side of the blade portion 14 includes at least one second groove 26 twisted in the direction of the rotation, and a second cutting edge 24 extending along the second groove 26 of the blade portion 14, and the tip portion 15 side of the blade portion 14 is provided with a second cutting portion 25 for processing the workpiece.