Rotary Drill Insert Support Surfaces for Torque and Axial Load Control
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Solution Overview
Problem
Existing drill tool assemblies face difficulties in mounting and removing inserts, leading to stress and fatigue at the mounting region of the drill shank, resulting in potential cracks and failure due to inadequate control of loading forces and torque transmission.
Innovation Solution
A drill tool insert and assembly with a tine-like interface featuring axial support surfaces that have a first and second declined orientation relative to the plane perpendicular to the longitudinal axis, effectively directing and absorbing torque and axial loading forces to minimize stress and fatigue, facilitating easy insertion and removal while maintaining strong axial and rotational locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If axial support surfaces are declined relative to a plane perpendicular to the longitudinal axis to maximise axial lock, then locking strength is improved, but mounting and removal of the insert becomes difficult
Solution Approach 1:
The patent introduces a second decline orientation in the circumferential direction, adding a dimensional aspect to the support surfaces. This dual-orientation approach allows the surfaces to provide strong axial locking through the first decline while the second decline facilitates easier mounting and removal by creating a more favorable engagement geometry.
2Strength
If axial support surfaces are declined to maximise axial lock, then locking strength is improved, but stress and fatigue at the mounting region increases leading to cracks and failure
Solution Approach 1:
The patent changes the geometric parameters of the support surfaces by introducing dual decline orientations. This parameter modification allows the surfaces to distribute loading forces more effectively, reducing stress concentrations and fatigue at the mounting region while maintaining strong locking through the declined geometry.
3Strength
If loading forces are not properly controlled, then insert retention is compromised, but undesirable deformation of the support body occurs leading to non-releasable clamping engagement
Solution Approach 1:
The patent applies different decline orientations to different regions of the support surfaces. The first decline orientation handles axial loading forces to maintain retention, while the second decline orientation in the circumferential direction controls local force distribution to prevent undesirable deformation and maintain releasability.
Data Source
AI summary
A cutting insert for a rotary drill tool and drill tool assembly in which an insert and a support body are coupled via a plurality of axial support surfaces. The support surfaces include a first declined orientation in the axial direction and a second declined orientation in the circumferential direction, so as to manage and control transmission of loading forces at the region of mounting the insert at the support body.