Maraging Steel Cutting Insert With Ti Braze Joint
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Solution Overview
Problem
Existing cutting tool inserts face challenges with steel carrier bodies due to brazing difficulties, low hardness, and tensile strength, and cemented carbide carriers require complex recycling and shaping processes.
Innovation Solution
A cutting tool insert with a maraging steel carrier body joined to a cutting element using a Ti-containing braze joint, which includes a reactive Ti layer forming a strong bond with the cutting element, allowing for easier shaping and recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If steel is used as carrier body material, then ease of shaping and recycling is improved, but brazing difficulty and strength increase
Solution Approach 1:
A copper intermediate layer is introduced between the steel carrier body and the cutting element. This copper layer acts as a mediator that facilitates brazing by improving wetting and bonding between the steel substrate and the cutting element, thereby resolving the brazing difficulty while maintaining the ease of shaping and recycling advantages of steel
Solution Approach 2:
The carrier body is constructed as a composite structure with a steel substrate and a copper intermediate layer. This composite material approach combines the advantages of steel (ease of shaping, recycling) with the brazing advantages of copper, creating a multi-layered structure that overcomes the limitations of pure steel
2Strength
If cemented carbide is used as carrier body, then hardness and strength are improved, but recycling complexity and shaping difficulty increase
Solution Approach 1:
The carrier body is segmented into two distinct material zones: a steel substrate for the bulk structure providing ease of shaping and recycling, and a copper intermediate layer at the bonding interface providing enhanced brazing capability. This segmentation allows each material to perform its optimal function without the drawbacks of using cemented carbide throughout
3Strength
If copper intermediate layer is added to steel carrier, then brazing strength is improved, but device complexity increases
Solution Approach 1:
The thickness of the copper intermediate layer is optimized to a specific range (0.1-5.0 μm) to achieve the desired brazing strength while minimizing added complexity. By controlling this critical parameter, the solution maintains simplicity while effectively resolving the brazing strength issue
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 maraging steel carrier body with a Ti-containing braze joint provides high strength and durability, comparable to cemented carbide carriers, while enabling easier recycling and shaping, maintaining performance in metal cutting operations.
Implementation Method 1
a reactive Ti layer forming a strong bond with the cutting element
Implementation Method 2
a reactive Ti layer forming a strong bond with the cutting element
Implementation Method 3
the carrier body and the cutting element are joined by brazing
Data Source
AI summary
The present invention relates to a cutting tool insert including a carrier body made of maraging steel. The carrier body has at least one rake face, at least one flank face and at least one pocket, wherein the at least one cutting element is situated in the at least one pocket. The cutting element has at least one cutting edge and can be made of any material known in the art of cutting. The cutting tool insert further includes a braze joint joining the carrier body and the at least one cutting element, wherein the braze joint includes Ti and a Ti containing joining layer with a thickness of between 0.03 and 5 μm adjoining to the cutting element.