Modular Rotary Cutting Tool Pocket Geometry for Torque Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Drills with replaceable cutting tips face deformation and failure due to stress concentration in the retaining and drive structure of the shank, limiting their service life.
Innovation Solution
A modular rotary cutting tool design featuring a shank with a pocket that receives a cutting insert, where the pocket includes a central pin-receiving hole and torque-transmitting walls, and the insert has corresponding centering and drive surfaces, optimized for improved torque transmission, rigidity, and stability through controlled geometric features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a drill with replaceable cutting tips is used, then the cutting head can be replaced when worn, but stress concentration occurs in the retaining and drive structure of the shank leading to deformation and failure
Solution Approach 1:
The cutting head is segmented from the shank, allowing the cutting head to be replaced independently when worn. This segmentation enables the shank to be reused while only replacing the cutting head, extending the overall service life of the drill system.
Solution Approach 2:
The retaining and drive structure of the shank is designed with optimized local geometry and material properties to distribute stresses more evenly. The pocket geometry and drive features are specifically engineered to minimize stress concentration points, enhancing the structural integrity and reliability of the shank.
2Stability of the object's composition
If the cutting head and shank have continuous and complementing configurations, then they can be retained and rotated together, but stress concentration occurs in the retaining and drive structure
Solution Approach 1:
The pocket geometry and drive features utilize asymmetric configurations optimized for stress distribution. The pocket includes specifically shaped centering walls and drive surfaces that create optimal contact points, reducing stress concentration while maintaining stable retention and rotation of the cutting head.
Solution Approach 2:
The design incorporates multi-dimensional geometric features including angled centering walls, curved drive surfaces, and three-dimensional pocket geometry. These dimensional variations create more uniform stress distribution across the retaining and drive structure compared to simple two-dimensional configurations.
Data Source
AI summary
Rotary cutting tools are disclosed comprising shanks and replaceable cutting inserts are provided. The shank comprises a pocket which receives an interchangeable cutting insert. The pocket includes a floor with a central pin-receiving hole, opposing pocket centering walls, and torque transmitting pocket drive walls. The cutting insert has a relatively long rear pin receivable in the central hole of the shank. A head of the cutting insert includes insert centering surfaces that contact the pocket centering walls of the shank, and insert drive surfaces that contact the torque transmitting pocket drive walls of the shank. The configurations and sizes of the shank and cutting insert features are controlled to provide improved torque transmission, rigidity and stability during operation of the rotary cutting tools.