Deburring Tool Cutting Edge Geometry for Helical Gear Burrs
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Solution Overview
Problem
Helical gear teeth produced by hobbing or skiving processes generate larger burrs with strong root portions, leading to increased load on the cutting edge of deburring tools and a high likelihood of chipping during burr removal.
Innovation Solution
A deburring tool with a shaft featuring a distal end surface orthogonal to the axis, an annular connecting surface, and notches with opposed surface portions forming a cutting edge. The cutting edge has a rake angle of 90°, preventing chipping and allowing for effective burr removal without damaging the workpiece surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional deburring tool with an acute angle cutting edge is used to remove burrs from helical gears, then the burrs can be removed, but the cutting edge and blade section are prone to chipping due to high load
Solution Approach 1:
The invention changes the rake angle parameter from an acute angle (conventional) to a substantially 90-degree angle (orthogonal to the axis). This parameter change allows the cutting edge to engage the burr perpendicularly, distributing the load more effectively and preventing chipping while maintaining burr removal capability
Solution Approach 2:
The invention transitions from a single acute-angle cutting edge to a three-dimensional orthogonal cutting edge configuration where the rake surface is substantially perpendicular to the axis. This dimensional change creates a more robust cutting geometry that can handle the high loads from helical gear burrs without chipping
2Adaptability or versatility
If the distal end surface of the deburring tool is not perpendicular to the workpiece surface, then the tool can adapt to surface variations, but the cutting edge may bite into and damage the workpiece surface
Solution Approach 1:
The invention incorporates a protrusion at the center of the distal end surface that acts as a preliminary guide element. This protrusion ensures the tool axis aligns perpendicular to the workpiece surface before the cutting edge engages, preventing the cutting edge from biting into the surface even if the tool is initially misaligned
Solution Approach 2:
The protrusion performs a preliminary alignment action by contacting the workpiece surface first and establishing the correct perpendicular orientation. This preliminary action positions the orthogonal cutting edge correctly before deburring begins, eliminating the risk of surface damage from angular misalignment
Data Source
AI summary
A shaft (2) of a deburring tool (1) has a distal end surface (5) orthogonal to its axis L, an annular connecting surface (6) extending in an X2 direction from an outer peripheral end of the distal end surface (5) toward an outer peripheral side, and an annular outer peripheral surface (7) extending parallel to the axis L from an end in the X2 direction of the connecting surface (6). The shaft (2) also has notches (8) at four locations in a circumferential direction. Each of the notches opens to the distal end surface (5), the connecting surface (6), and the outer peripheral surface (7). Each of the notches (8) has an inner wall surface (10) having a pair of opposed surface portions (11) and (12) opposed to each other in the circumferential direction. Each of the pair of opposed surface portions (11) and (12) extends in a radial direction around the axis L. The edges of the pair of opposed surface portions (11) and (12) are cutting edges (25).