Multi-Material Gear Shaft Manufacturing Without Welded Joints
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Solution Overview
Problem
Traditional gear shaft manufacturing using welding is complex and costly, necessitating a method to reduce costs and lead time while enhancing performance, life, and reliability.
Innovation Solution
The method involves directed energy deposition (DED) to form gear shafts with distinct portions made of different materials, including a transitioning portion with a varying ratio of materials, allowing for a continuous manufacturing process and final machining for precise dimensions, using materials like titanium, aluminum, nickel, or steel with specific mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If welding is used to assemble gear shafts from different materials, then gear shafts can be manufactured with different material properties in different portions, but the manufacturing process becomes complex and costly
Solution Approach 1:
The patent combines multiple manufacturing operations (deposition, transitioning, machining) into a single integrated directed energy deposition system. The system deposits first and second materials in different portions of the gear shaft, creates transitioning portions with varying material ratios, and performs final machining all through one continuous process, eliminating the need for separate welding operations and reducing manufacturing complexity
Solution Approach 2:
The patent uses composite material deposition where a transitioning portion is formed by depositing a varying ratio of first and second materials. This creates a gradient structure where the material composition changes continuously from one material to another, allowing different portions of the gear shaft to have optimized material properties without requiring complex joining processes
2Adaptability or versatility
If welding is used to assemble gear shafts, then different materials can be joined, but the manufacturing cost and lead time increase
Solution Approach 1:
The patent implements a continuous manufacturing process where the directed energy deposition system operates continuously to deposit materials, create transitioning portions, and form the gear shaft without interruption. This eliminates the downtime associated with welding operations, material handling, and assembly, thereby reducing manufacturing cost and lead time while maintaining the capability to join different materials
3Adaptability or versatility
If welding is used to assemble gear shafts, then different materials can be connected, but reliability and performance decrease
Solution Approach 1:
The patent changes the fundamental parameter of material connection from mechanical/thermal joining (welding) to direct metallurgical bonding through directed energy deposition. The process parameters include depositing materials in specific portions, controlling the transitioning portion with varying material ratios, and performing final machining to achieve precise dimensions, all of which contribute to enhanced reliability and performance
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 simplifies production, reduces energy consumption, and enables gear assemblies with tailored mechanical properties, enhancing reliability and stability while eliminating the need for complex joining operations, thereby improving performance and reducing defects.
Implementation Method 1
depositing only a first material via directed energy deposition (DED), forming a first portion of the gear shaft via the depositing only the first material via directed energy deposition (DED)
Data Source
AI summary
A method of manufacturing a gear shaft including depositing only a first material via directed energy deposition (DED), forming a first portion of the gear shaft via the depositing only the first material via directed energy deposition (DED), forming a transitioning portion of the gear shaft via depositing of a varying ratio of the first material with a second material via DED, and forming a second portion of the gear shaft via the depositing via DED of only the second material.