Plow-Shaped Cutting Elements for Earth-Boring Tools

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Solution Overview

Problem

Polycrystalline diamond cutting elements used in earth-boring tools face thermal instability and brittleness due to differential thermal expansion rates between diamond and catalyst materials, leading to delamination and reduced effectiveness at high temperatures.

Innovation Solution

A cutting element design featuring a substrate with superabrasive material having a first and second planar surface oriented at an angle, forming an apex with a length less than the maximum diameters of the surfaces, which helps in reducing stress and maintaining efficiency at elevated temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If polycrystalline diamond cutting elements are used in earth-boring tools, then cutting effectiveness is improved, but thermal instability and brittleness occur due to differential thermal expansion between diamond and catalyst materials

Engineering Contradiction:

Improvecutting effectivenessVSAvoidthermal stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent removes the catalyst material from the polycrystalline diamond cutting element structure. By extracting the catalyst that causes differential thermal expansion, the invention eliminates the source of thermal instability and delamination while preserving the diamond's cutting effectiveness

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses a composite structure consisting of polycrystalline diamond material bonded to a metal substrate. This composite design allows the diamond to provide cutting hardness while the metal substrate provides thermal stability and structural support, resolving the contradiction between cutting effectiveness and thermal stability

Inventive Principle:

Principle #40Composite materials

2Strength

If catalyst material is used in polycrystalline diamond cutting elements, then diamond grains are bonded together, but delamination occurs at high temperatures due to differential thermal expansion

Engineering Contradiction:

Improvebonding strengthVSAvoiddelamination

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The invention extracts and removes the catalyst material from the cutting element structure. By taking out the catalyst that causes differential thermal expansion, the patent eliminates the mechanism that leads to delamination while maintaining diamond grain bonding through alternative means

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the thermal parameters of the cutting element by removing the catalyst material with high thermal expansion coefficient. This parameter change eliminates the differential thermal expansion issue that causes delamination at high temperatures

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional cutting element geometry is used, then manufacturing is simplified, but stress concentration occurs leading to reduced durability at elevated temperatures

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoiddurability

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

The patent applies curved or rounded geometry to the cutting element surfaces, replacing sharp corners and edges with radiused transitions. This curvature distribution reduces stress concentration points while maintaining manufacturing feasibility through standard forming processes

Inventive Principle:

Principle #14Spheroidality (Curvature)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The design enhances thermal stability and durability of the cutting elements, allowing them to operate effectively up to higher temperatures with reduced brittleness and wear, improving drilling performance.

Implementation Method 1

differential thermal expansion rates between diamond and catalyst materials

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS9752387B2Plow-shaped cutting elements for earth-boring tools, earth-boring tools including such cutting elements, and related methods

Publication Date: 2017.09.05 BAKER HUGHES CO

AI summary

A cutting element for an earth-boring tool includes at least one volume of superabrasive material on a substrate. The volume of superabrasive material includes a first planar surface and a second planar surface oriented at an angle relative to the first planar surface and intersecting the first planar surface along an apex. The first planar surface has a circular or oval shape having a first maximum diameter, and the second planar surface has a circular or oval shape having a second maximum diameter. The apex has a length less than the first maximum diameter and the second maximum diameter. Earth-boring tools include such a cutting element attached to a body. Methods of forming earth-boring tools include the attachment of such a cutting element to a body of an earth-boring tool.