Carbide Stem Press Fit into Steel Body
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing attack tools used in formation degradation, such as asphalt milling and mining, experience wear and have limited lifespan due to inadequate impact resistance.
Innovation Solution
A high-impact resistant tool is created by bonding super hard materials like diamond to a cemented metal carbide substrate at a non-planar interface, with a press-fitted stem and a tapered surface design that distributes impact forces, allowing the tool to withstand greater than 80 joules of impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional attack tools are used in formation degradation, then the tools can perform basic cutting functions, but they experience wear and have limited lifespan due to inadequate impact resistance
Solution Approach 1:
The invention uses a composite structure combining a superhard material layer (diamond or cubic boron nitride) bonded to a carbide substrate. This composite construction provides both the hardness needed for cutting and the toughness required for impact resistance, resolving the contradiction between reliability and strength.
Solution Approach 2:
The superhard material is applied as a layer on the cutting surface rather than making the entire tool from superhard material. This localized application provides enhanced wear resistance where needed while maintaining the overall structural integrity and impact resistance of the carbide substrate, extending tool lifespan without sacrificing strength.
2Strength
If a press-fitted stem design is used, then the tool can withstand greater than 80 joules of impact, but the manufacturing precision requirements increase
Solution Approach 1:
The press-fitted stem design relies on precise dimensional parameters and interference fit calculations to achieve the desired impact resistance. By carefully controlling the stem diameter, bore size, and interference fit values, the design achieves >80 joules impact resistance while managing manufacturing precision requirements through parameter optimization.
3Reliability
If super hard materials like diamond are bonded to carbide substrate at a non-planar interface, then the tool exhibits enhanced durability, but the manufacturing complexity increases
Solution Approach 1:
The non-planar bonding interface between the superhard material layer and carbide substrate creates a mechanically interlocked structure that enhances durability. The complex interface geometry, while increasing manufacturing complexity, provides superior bonding strength and resistance to delamination under impact loads, thereby improving overall tool reliability.
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 tool exhibits enhanced durability and impact resistance, prolonging its useful life by effectively distributing and absorbing impact forces, as demonstrated by drop test results showing it can withstand significantly higher loads compared to conventional designs.
Implementation Method 1
A stem is formed in the base end of the carbide segment opposite the front end and the carbide stem is press fitted into a bore of a steel body
Data Source
AI summary
In one aspect of the present invention, a high impact resistant tool, having a super hard material is bonded to a cemented metal carbide substrate at a non-planar interface. The cemented metal carbide substrate is bonded to a front end of a cemented metal carbide segment. A stem is formed in the base end of the carbide segment opposite the front end and the carbide stem is press fitted into bore of a steel body.