Chamfering Cutter Geometry for Poisson Burr Suppression
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Solution Overview
Problem
Chamfering cutters often form Poisson burrs when chamfering a workpiece's corner, as the cutting forces applied by the existing chamfering cutters can lead to uneven chip flow and burr formation.
Innovation Solution
A chamfering cutter with a blade having two cutting edge portions, an inner and an outer cutting edge, where the inner cutting edge extends rearward and the outer cutting edge extends forward, both oriented radially outward, directing cutting forces toward the center to suppress burr formation, and featuring a bent cutting edge portion between them to facilitate chip discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional chamfering cutter with a single cutting edge extending linearly in the radial direction is used, then the structure is simple and easy to manufacture, but Poisson burrs are likely to be formed on the chamfer surface
Solution Approach 1:
The cutting edge is divided into two distinct portions: an inner cutting edge portion extending in the rearward rotational direction and an outer cutting edge portion extending in the forward rotational direction. This segmentation allows each portion to contribute differently to the cutting process, directing cutting forces toward the center and preventing Poisson burr formation while maintaining manufacturing feasibility
Solution Approach 2:
The cutting edge employs asymmetric extension directions for its inner and outer portions relative to the rotational direction. The inner portion extends rearward while the outer portion extends forward, creating an asymmetric configuration that optimizes force distribution and chip flow to eliminate burrs without excessive complexity
2Manufacturing precision
If the cutting edge is designed with inner and outer portions extending in different directions, then Poisson burr formation is suppressed, but the manufacturing complexity increases
Solution Approach 1:
The cutting edge design changes the geometric parameters of the blade by extending portions in opposite rotational directions. This parameter change achieves burr suppression through optimized force vectors while the extensions remain linear and predictable, facilitating straightforward manufacturing processes
3Productivity
If a spiral chip discharge groove is provided around the axis, then chip discharge is optimized, but manufacturing difficulty increases
Solution Approach 1:
Instead of using a conventional spiral chip discharge groove that winds around the axis, the invention employs a linear chip discharge groove extending in the axial direction. This inverted approach simplifies manufacturing while maintaining effective chip evacuation through the linear path provided by the groove
Data Source
AI summary
A beveling cutter (1) is provided in which a cutting blade (10) is composed of, when seen from an axial direction (X): an inner cutting blade portion (16) extending linearly toward a rear side R2 in a rotational direction R and toward the outer peripheral side; an outer cutting blade portion (17) extending linearly toward a forward side (R1) in the rotational direction (R) and toward the outer peripheral side on the radially outer side of the inner cutting blade portion (16); and a bending cutting blade portion (18) that connects the outer peripheral end of the inner cutting blade portion (16) with the inner peripheral end of the outer cutting blade portion (17). During a beveling operation, a cutting force vector (V1) applied from the inner cutting blade portion (16) to an edge portion (3) of a workpiece (2) and a cutting force vector (V2) applied from the outer cutting blade portion (17) to the edge portion (3) of the workpiece (2) are directed toward the center in the width direction of a bevel (5) formed by cutting. Formation of Poisson burr can thus be suppressed.