Forge Bonding Stroke Control for Strong Dissimilar Metal Joints
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing metal bonding methods, such as laser welding and resistance spot welding, face challenges in achieving practical bonding strength due to the formation of fragile intermetallic compounds and thermal influences, leading to reduced material strength and stability, particularly in dissimilar material bonding.
Innovation Solution
A forge bonding machine that employs indirect heating through heat conduction and controlled pressure to regulate the bonding temperature and reduction ratio, facilitating solid-phase bonding at lower temperatures with plastic flow, thereby enhancing diffusion and cleanliness at the bonding interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser welding or resistance spot welding is used, then bonding speed and productivity are improved, but fragile intermetallic compounds are generated and bonding strength is reduced
Solution Approach 1:
The invention changes the bonding parameters from high-temperature melting (laser welding) or electrical resistance heating (spot welding) to solid-phase bonding at lower temperatures (400-600°C). This parameter change prevents IMC formation while maintaining high productivity through controlled heating and pressing
Solution Approach 2:
The invention utilizes solid-phase bonding without melting, avoiding the liquid phase transition that causes IMC formation. The material remains in solid phase throughout the bonding process, achieving strong bonds without the harmful byproducts of melting and solidification
2Strength
If high temperature welding is applied, then bonding is achieved, but thermal influence reduces material strength and joint stability
Solution Approach 1:
The invention reduces the bonding temperature from melting point levels (typically >1000°C for metals) to solid-phase bonding temperatures (400-600°C). This parameter change eliminates excessive thermal influence on the base material while still achieving adequate bonding through diffusion and plastic flow at the interface
3Strength
If melt welding methods are used, then bonding is achieved, but surface cleanliness deteriorates due to sputtering and porosity
Solution Approach 1:
The invention avoids the melting phase transition that causes sputtering, vaporization, and porosity. By maintaining solid phase throughout the process, the surface remains clean and free from vapor-related defects, achieving both bonding and high surface quality
Solution Approach 2:
The invention converts the potential harm of oxide layers and surface contaminants into beneficial plastic flow during pressing. The controlled deformation at bonding temperature helps distribute and reduce contaminant layers rather than vaporizing them, improving interface cleanliness
4Strength
If solid-phase bonding is used, then IMC formation is avoided, but conventional methods require expensive horns or complex end treatment
Solution Approach 1:
The invention replaces complex mechanical systems (ultrasonic horns, friction stir tools with complex end treatments) with a simpler heated pressing system. The bonding is achieved through controlled heating and uniaxial pressing, eliminating the need for specialized mechanical bonding tools
Solution Approach 2:
The invention creates a universal bonding system that can bond various metal combinations (Al-Al, Al-Cu, Fe-Al, Ti-Al, Ni-Al) using the same basic heated pressing mechanism. This multi-functional approach eliminates the need for different specialized tools for different material pairs
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 forge bonding machine achieves stable and high-quality bonding by reducing contaminant layers and controlling the reduction ratio, resulting in improved bonding strength and productivity without the drawbacks of conventional methods.
Implementation Method 1
heating means for heating the bonding portion to a predetermined temperature range
Implementation Method 2
pressurizing body that applies pressure on an upper-surface side of the bonding portion
Implementation Method 3
facilitating solid-phase bonding at lower temperatures with plastic flow
Data Source
AI summary
A forge bonding machine includes: a supporting body supporting a lower-surface side of bonding portion of members to be bonded in a state where the members are layered; a pressurizing body applying pressure on an upper-surface side of the bonding portion in the state where the members are layered; a stroke controller controlling a gap between the supporting and the pressurizing bodies; and a heater raising a temperature of the bonding portion to a predetermined temperature range by directly or indirectly coming into contact with the members, in which the stroke controller controls a reduction ratio R (T0/T1) that represents a ratio of a thickness T0 of the bonding portion before bonding to a thickness T1 after the bonding, and the supporting body or/and the pressurizing body comprise a rod controlled in terms of stroke toward the bonding portions by a displacement meter or a stopper.