Rotary cutting insert and tool having declined axial support surfaces

Abstract

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 comprise 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.

Description

technical field [0001] The present invention relates to a rotary drilling tool insert and a drilling tool assembly in which the insert can be mounted to a support to maximize insert retention while minimizing stress and fatigue at the support. Background technique [0002] Multi-part drilling tool assemblies have been developed in which inserts formed of hard expensive materials such as cemented carbide, ceramics, etc. are locked axially and radially in a releasable manner At knives or carriers formed from less hard, less expensive materials. Inserts are generally considered wear parts and are provided with an axially forward-facing cutting zone, which typically includes a series of cutting edges and cutting surfaces. [0003] The transfer of axial load forces and torque from the insert to the drill body needs to be controlled and managed to securely mount the insert during use while enabling the insert to be replaced once worn. Bayonet-type locking interfaces have been de...

AI Technical Summary

Problems solved by technology

[0005] However, existing drilling tool assemblies are disadvantageous in many ways

First, it is often difficult to install and remove blades within the above types of rotating assemblies

Furthermore, the loading forces of the above arrangements encountered during use will generally induce stress and fatigue at the mounting area of ​​the shank, leading to stress concentrations, cracks and shank failure

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