Conical Braze Joint Geometry for Carbide-to-Steel Stress Control
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Solution Overview
Problem
Existing wear-resistant tools for mining, milling, and excavation lack effective control over braze thickness at the joint between carbide and steel components, leading to inadequate stress distribution and reduced durability under high impact loads.
Innovation Solution
A degradation assembly with an inverted conical face on the metal body and a carbide bolster, featuring protrusions to control braze thickness, where the braze material has a non-uniform thickness and the carbide bolster is bonded to the metal body with a stem that tapers at less than four degrees, allowing for increased braze thickness at the periphery to manage stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional brazing methods are used without thickness control, then the brazing process is simple and fast, but the braze thickness is uneven leading to inadequate stress distribution
Solution Approach 1:
The patent applies preliminary action by providing a preliminary conical face on the carbide component before brazing. This pre-formed geometric feature controls the braze thickness distribution during the brazing process, ensuring uniform stress distribution without requiring complex post-processing or advanced brazing techniques. The conical face geometry is designed in advance to achieve the desired braze thickness profile.
Solution Approach 2:
The patent utilizes parameter changes by varying the angle of the conical face on the carbide component. By adjusting the conical angle, the braze thickness distribution can be optimized for different application requirements. This geometric parameter change allows control over stress distribution and braze joint properties without complicating the brazing process itself.
2Strength
If uniform braze thickness is used, then the manufacturing process is simple, but stress distribution is inadequate under high impact loads
Solution Approach 1:
The patent applies local quality by creating non-uniform braze thickness distribution through the conical face geometry. Different regions of the braze joint have different thicknesses optimized for their specific stress conditions. The thicker braze regions provide enhanced stress distribution and load bearing capacity where needed, while thinner regions maintain structural efficiency.
3Reliability
If thin braze thickness is used, then the joint is compact and lightweight, but durability under high impact loads is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the conical face angle to achieve the minimum necessary braze thickness for durability. By carefully selecting the conical angle parameters, sufficient braze thickness is provided in critical stress regions to ensure durability under impact loads, while minimizing overall braze material volume and maintaining a compact joint design.
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 controlled braze thickness and geometry enhance the durability and resistance to wear of the tools by optimizing stress distribution and providing a thicker transition between the carbide and steel, thereby improving performance in high-impact applications.
Implementation Method 1
a base end of a carbide bolster adapted to be brazed to the top end of the metal body within the inverted conical face
Data Source
AI summary
In one aspect of the present invention, a degradation assembly comprises an inverted conical face formed in a top end of a metal body tapering towards a central axis of the metal body. A base end of a carbide bolster is adapted to be brazed to the top end of the metal body within the inverted conical face. At least one protrusion is formed in the inverted conical face and is adapted to control a braze thickness between the face and the base end.