Hardened Core Pick Assembly Wear Resistance
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Solution Overview
Problem
The working life span of pick assemblies used for degrading formations is limited, especially when engaging harder formations, leading to diminished performance due to wear.
Innovation Solution
A pick assembly design featuring a core assembly with a cutting element bonded to a substrate and bolster, housed within a sleeve that provides compression and support, utilizing materials with varying strengths to distribute load and extend durability, including a conical cutting element made of superhard materials like diamond or tungsten carbide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a conventional pick assembly with uniform material construction is used, then the initial strength is adequate, but the working life span is limited due to wear
Solution Approach 1:
The pick assembly employs a core assembly with non-uniform material distribution, where the outer layer consists of harder material than the inner material. This local quality differentiation allows the outer surface to resist wear while the inner material provides toughness and shock absorption, thereby extending working life span without compromising reliability
Solution Approach 2:
The invention utilizes composite material construction with at least two different materials having different hardness properties. The harder outer material resists abrasion from formation degradation, while the softer inner material absorbs impact stresses, creating a synergistic effect that simultaneously improves durability and maintains performance capability throughout extended service life
2Strength
If a harder material is used for the entire pick assembly, then wear resistance improves, but the material becomes more brittle and prone to fracture
Solution Approach 1:
The pick assembly implements local quality by applying harder material specifically to the wear-prone outer surface while maintaining softer, more ductile material in the interior. This gradient structure ensures that wear resistance is maximized at the contact surface without compromising the overall toughness of the assembly, preventing brittle fracture while maintaining abrasion resistance
3Stability of the object's composition
If a softer material is used for the entire pick assembly, then toughness improves, but wear resistance deteriorates
Solution Approach 1:
The invention applies softer material to the interior regions of the pick assembly where toughness and shock absorption are critical, while reserving harder material for the outer wear surface. This spatial differentiation of material properties ensures that toughness is optimized in the bulk material without sacrificing wear resistance at the functional interface
4Duration of action of moving object
If a complex multi-layer core assembly is used, then durability is extended, but manufacturing complexity increases
Solution Approach 1:
The core assembly is segmented into distinct functional layers with different material properties, where each layer serves a specific purpose in the stress and wear management system. This segmentation allows for optimized performance while maintaining manufacturability through established multi-material fabrication techniques
Solution Approach 2:
The pick assembly employs a nested structure where the core assembly is disposed within an axial bore of the pick body, and the core assembly itself contains concentric layers of different materials. This nested arrangement maximizes the durability benefits of multi-material construction while minimizing manufacturing complexity through sequential assembly processes
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 significantly extends the working life span of pick assemblies by distributing stress loads and preventing unnecessary movement, maintaining structural integrity despite wear on the pick body, and providing enhanced durability through strategic material selection and configuration.
Implementation Method 1
The sleeve may be shrink fitted around at least a portion of the substrate and the bolster
Implementation Method 2
The cutting element may comprise a conical geometry... selected from the group consisting of natural diamond, synthetic diamond, polycrystalline diamond, monocrystalline diamond, cubic boron nitride, tungsten carbide
Data Source
AI summary
A pick assembly comprising a pick body comprising a shank opposite a front end. The shank may be configured for attachment to a driving mechanism while the front end may comprise a core assembly disposed within an axial bore of the front end. The core assembly may comprise a cutting element bonded to a substrate attached to a bolster disposed within a sleeve which is disposed within the axial bore.