Superhard Pick Tool Cemented Carbide Support Body
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Solution Overview
Problem
Pick tools with synthetic diamond tips are brittle and have limited fracture resistance, leading to reduced working life in applications like road reconditioning and coal mining, where they are used to break or degrade hard materials like asphalt and rock.
Innovation Solution
A pick tool design featuring a superhard tip bonded to a cemented carbide support body with a large volume, secured within a steel holder via a shrink-fit connection, providing enhanced support and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If synthetic diamond material is used for the working tip, then abrasion resistance is improved, but fracture resistance deteriorates
Solution Approach 1:
The pick tool uses a composite structure combining synthetic diamond tip with cemented carbide support body and steel holder. The synthetic diamond provides superior abrasion resistance for cutting hard materials, while the cemented carbide and steel components provide fracture resistance and structural support, resolving the contradiction between abrasion resistance and fracture resistance
2Reliability
If the volume of cemented carbide support body is increased, then fracture resistance is improved, but device complexity increases
Solution Approach 1:
The invention merges the support function and structural function into a single integrated cemented carbide support body with optimized geometry. The support body is designed with specific volume requirements (at least 6 cm³, preferably at least 10 cm³) to provide adequate fracture resistance while maintaining a compact, simple structure that does not unnecessarily increase device complexity
3Ease of operation
If shrink-fit connection is used to secure the insert, then assembly ease is improved, but manufacturing precision requirements increase
Solution Approach 1:
The shrink-fit connection utilizes thermal expansion principles where the steel holder is heated to expand its internal bore, allowing the cemented carbide support body to be inserted, then cooled to create a tight interference fit. This provides easy assembly through controlled thermal processes while achieving precise fitting through the natural thermal contraction of the holder
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 of pick tools by providing robust support to the superhard tip, reducing fracture and wear, while allowing for easier assembly and disassembly, thus balancing cost and performance.
Implementation Method 1
heating the steel holder to expand the bore
Implementation Method 2
shrink fitting the insertion shank into the bore of the steel holder
Data Source
AI summary
A pick tool comprising an insert and a steel holder for the insert, the insert comprising a superhard tip joined to a cemented carbide support body having an insertion shank; the steel holder comprising a shaft for connection to a tool carrier and provided with a bore configured for receiving the insertion shank; the volume of the cemented carbide support body being at least 6 cm3.