Rotary Tool Land Face Geometry for Burr Suppression
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Solution Overview
Problem
There is a demand for further improvement in the sharpness and durability of rotary tools, such as drills, which are used for drilling workpieces, as existing designs may not adequately address the need for enhanced cutting performance and burr suppression.
Innovation Solution
A rotary tool design featuring a body with multiple parts of varying diameters, including a first part, a second part, and a third part, with specific cutting edges and flutes, and an outer peripheral surface that includes a land face with varying widths and regions, which enhances cutting performance and suppresses burr generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the step portion cutting edge is inclined by a range of 10° to 25°, then sharpness and durability are improved, but further improvement in sharpness and durability is limited
Solution Approach 1:
The rotary tool body is divided into multiple sections (first part, second part, third part) with different outer diameters and cutting edges. The first cutting edge is located at the first end, and a second cutting edge is located on the third part, allowing each section to perform cutting functions independently and optimize sharpness for different machining requirements
Solution Approach 2:
The outer peripheral surface includes a first portion and a second portion with different configurations. The first portion has a first outer diameter, and the second portion has a second outer diameter that is larger. This local differentiation allows optimized cutting geometry in specific regions to achieve superior sharpness and cutting performance
2Stability of the object's composition
If the outer diameter increases from first part to second part, then structural stability is improved, but burr generation may increase
Solution Approach 1:
The first cutting edge at the first end performs preliminary cutting to create a clean entry point, and the second cutting edge on the third part performs secondary cutting to finish the workpiece. This preliminary action by multiple cutting edges prevents burr formation by ensuring clean material separation
Solution Approach 2:
The third part with intermediate outer diameter serves as a transition section between the first and second parts. It includes a second cutting edge that acts as an intermediary cutting element, gradually removing material and preventing sudden stress concentration that could cause burrs
3Productivity
If the land face width varies in the first region, then chip discharge efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The outer peripheral surface includes curved portions transitioning between different diameter sections. These curved surfaces facilitate smooth chip flow and discharge while maintaining manufacturability through standard forming processes
Data Source
AI summary
A rotary tool may include a body having a first part, a second part, a third part, a first cutting edge located at a first end, a flute extending from the first cutting edge toward a second end, and an outer peripheral surface. The outer peripheral surface in the third part may have a first portion. The third part may have a land face, and a second cutting edge located on a ridge line where a first portion and the land face intersect. The land face may have a first region in which a width increases from a side of the first end toward a side of the second end, and a second region that is located closer to the second end than the first region in which a width decreases from a side of the first end toward the second end.