Tufting Tool Insert Manufacturing via Melted Cavity Filling
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Solution Overview
Problem
The existing methods for manufacturing tufting tools using brazing processes face issues such as thermal expansion mismatch between steel and hard metal, leading to cracking, high costs and hazards from rare earth metal pastes, and inefficiencies due to complex process control and high defect rates.
Innovation Solution
A method involving forming a cavity in a steel tufting tool and filling it with a harder material, such as hard metal alloys or ceramics, which is then melted using concentrated energy to create a robust and efficient insert, eliminating the need for brazing paste and reducing wear and tear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a brazing process is used to join steel and hard metal, then the insert can be secured on the tufting tool, but thermal expansion mismatch causes high tension and cracking during cooling
Solution Approach 1:
The patent changes the temperature parameter profile during the joining process. Instead of uniform heating and cooling, the process uses controlled heating to melting point followed by directional cooling, which manages thermal expansion differently than conventional brazing. This parameter change allows the steel and hard metal to be joined without the high tension that causes cracking during cooling.
Solution Approach 2:
The patent replaces the mechanical brazing process (which relies on paste application and capillary action) with a melting and fusing process. The steel and hard metal are heated to melting point and fused directly, eliminating the need for brazing paste and the associated thermal expansion mismatch problems that cause cracking.
2Ease of manufacture
If brazing paste is used to join steel and hard metal, then the materials can be connected, but the paste is expensive, releases dangerous fumes, and is prone to wear
Solution Approach 1:
The patent extracts and eliminates the brazing paste from the joining process. Instead of using paste as an intermediary material, the process directly melts and fuses the steel and hard metal together. This removes the source of dangerous fumes, eliminates the need for expensive rare earth metals, and removes the soft, wear-prone joint material.
Solution Approach 2:
The patent replaces the expensive, hazardous brazing paste with a simple, clean melting process that requires no additional consumable materials. The joining is achieved through direct fusion without any paste application, eliminating ongoing costs and environmental hazards associated with paste procurement and disposal.
3Ease of manufacture
If brazing process is used, then the insert can be attached to the tufting tool, but complex process control is required leading to high defect rates
Solution Approach 1:
The patent employs a self-aligning mechanism where the cavity in the steel tufting tool is designed to automatically position the hard metal insert during the melting and fusing process. The cavity geometry guides the insert into correct alignment, eliminating the need for complex external control systems and reducing defects from misalignment, improper paste application, or incorrect gaps.
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
This approach results in a tufting tool with improved wear resistance and reduced defect rates, avoiding thermal expansion issues and environmental hazards, while enabling precise alignment and enhanced performance in tufting machines.
Implementation Method 1
The melting can be performed by the use of concentrated energy such as a laser beam or an electron beam
Implementation Method 2
The melting can be performed by the use of concentrated energy such as a laser beam or an electron beam
Implementation Method 3
the steel, the brazing paste and the hard metal is heated to several hundred degrees Celsius. All the materials then elongate due to thermal expansion
Data Source
Figure 1~2
Figure 3a~3b
Figure 4
AI summary
A tufting tool (20) is provided. The tufting tool can be adapted to be used in a tufting machine. The tufting tool is formed by a first material (22). The tufting tool comprises an insert of a second material (24), where the second material is harder than the first material. The insert is formed by a cavity in the first material filled with the second, melted, material filling said cavity. Hereby a tufting tool with an insert can be made in a robust and efficient manner.