Cutter Insert Recess for Backup Cutter Installation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The challenge in manufacturing rotary drill bits with steel bodies is the difficulty in machining pockets for backup cutters due to interference with existing machining equipment, which hinders the effective placement and retention of backup cutting elements.

Innovation Solution

The use of cutter inserts with a recess configured to receive backup cutting elements, allowing for adjustable back rake and exposure, which are removably affixed to the bit body behind primary cutter pockets, facilitating easier installation and maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional machining methods are used to create pockets for backup cutters, then the drill bit structure is simplified, but machining interference occurs and backup cutters cannot be properly installed

Engineering Contradiction:

Improvebackup cutter installationVSAvoidcutter insert structure

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The cutter support structure is divided into two functional parts: the cutter insert body (which provides structural support) and the cutter recess (which receives and positions the backup cutter). This segmentation allows the recess to be specifically designed for backup cutter retention without interfering with machining operations, while the insert body integrates with the blade structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cutter insert acts as an intermediary component between the blade and the backup cutter. The insert contains a specifically designed recess that receives the backup cutter, eliminating the need to machine complex pockets directly in the blade. This intermediary structure resolves the machining interference problem while providing proper backup cutter support.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If backup cutters are positioned with optimal back rake and exposure, then cutting performance is improved, but adjustment complexity increases

Engineering Contradiction:

Improvecutting performanceVSAvoidback rake adjustment

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The cutter recess is designed with adjustable positioning capabilities that allow the backup cutter to be set at different back rake angles and exposure levels. The recess geometry can be modified to accommodate various cutter positions, enabling optimization of cutting performance while maintaining ease of adjustment through standardized insert designs.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The design allows for variation of geometric parameters of the cutter recess (such as depth, angle, and position) to achieve optimal back rake and exposure settings. By changing the recess parameters rather than the cutter itself, the system achieves improved cutting performance while keeping the adjustment process standardized and manageable.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS7594554B2Cutting element insert for backup cutters in rotary drill bits, rotary drill bits so equipped, and methods of manufacture therefor

Publication Date: 2009.09.29 BAKER HUGHES CO

AI summary

Cutter inserts for rotary drill bits include a cutter insert body having a cutter recess configured to receive a backup cutter therein. Rotary drill bits for drilling a subterranean formation include at least one such cutter insert affixed to a blade rotationally behind a cutter pocket for a primary cutter. Methods of manufacturing such drill bits include providing a bit body having a plurality of blades. A cutter insert is provided and secured within a cutter insert recess formed in the face of a blade. A backup cutter is secured within a cutter recess of the cutter insert.