Diffusion Soldering Press Tool for Uniform Joining Pressure
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Solution Overview
Problem
Conventional diffusion soldering and sintering devices face challenges in applying a uniformly even press force to electronic assemblies, leading to potential pressure peaks and uneven joining layers, which can affect mechanical, electrical, and thermal properties.
Innovation Solution
The diffusion soldering and/or sintering device features a guide frame that allows plungers to be axially movable, ensuring the press force is transmitted homogeneously in both space and time. This design includes a pressure pad with a variable internal pressure and a sealing mechanism to prevent damage and ensure efficient pressure transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional diffusion soldering and sintering devices apply pressure to electronic assemblies, then connection is achieved, but pressure peaks and uneven joining layers occur
Solution Approach 1:
The pressure transmission system is segmented into multiple plungers (at least two) that are axially movable in guide frames, allowing independent control and distribution of pressure to different regions of the assembly, thereby preventing pressure peaks and ensuring uniform joining layers
Solution Approach 2:
Each plunger is equipped with a pressure pad that can be independently pressurized, enabling localized pressure application tailored to specific regions of the assembly, ensuring optimal pressure distribution across different areas with varying requirements
2Strength
If pressure is applied to compact the joining layer, then mechanical stability is improved, but pressure peaks may damage components
Solution Approach 1:
The pressure pad acts as a cushioning element between the plunger and the assembly, distributing the applied pressure uniformly and preventing sharp pressure peaks that could damage components, while still providing sufficient compaction force for mechanical stability
Solution Approach 2:
The pressure pad serves as an intermediary element that mediates between the mechanical force from the plunger and the assembly, transforming concentrated force into distributed pressure through its fluid-filled structure, thereby protecting components from damage
3Manufacturing precision
If multiple plungers are used to distribute pressure, then uniformity is improved, but device complexity increases
Solution Approach 1:
Each plunger assembly serves multiple functions: it provides structural support, transmits pressure uniformly through the pressure pad, guides axial movement via the guide frame, and enables independent pressure control, thereby achieving complex objectives with a relatively simple modular structure
Solution Approach 2:
The pressure pad is nested within the plunger assembly, which is in turn guided by the guide frame, creating a compact nested structure that minimizes space requirements while maintaining the functional benefits of multiple pressure application points
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 configuration enables a simultaneous and parallel buildup of press force, ensuring even distribution and reducing the risk of pressure peaks, thereby achieving uniform joining layers with consistent mechanical, electrical, and thermal properties.
Implementation Method 1
at least one pressure pad (24, 90) filled or fillable with a fluid or with a displaceable medium whose internal pressure is variable
Implementation Method 2
at least one, in particular several, plungers (60, 152) in operative connection to the pressure pad and configured for transmission of a press force, generated by a pressure increase in the pressure pad
Implementation Method 3
plungers (60, 152) in operative connection to the pressure pad and configured for transmission of a press force, generated by a pressure increase in the pressure pad, to the assembly and of thermal energy
Implementation Method 4
The guide frame and the sealed plunger(s) guided therein thus seal the pressure pad against the press surface
Data Source
AI summary
The invention relates to a diffusion soldering device and/or sintering device, to a press tool and to a system comprising these for connecting components of at least one electronic assembly, in particular of a plurality of electronic assemblies, by means of diffusion soldering or pressure sintering. The device comprises an upper tool and a lower tool between which the assemblies are held, wherein the upper tool has at least one pressure pad filled or fillable with a fluid or displaceable medium whose internal pressure is variable and at least one, in particular several, plungers in operative connection to the pressure pad and configured for transmission of a press force, generated by a pressure increase in the pressure pad, to the assemblies.The present invention provides that the upper tool has a guide frame in which the plunger(s) is/are guided axially movable along the effective direction of the press force, and the plunger(s) is/are movably guided inside the guide frame while sealed against the pressure pad.In a subordinate aspect, a press tool is proposed that is usable in an aforementioned diffusion soldering or sintering device, and a multi-module system comprising a press tool and/or an aforementioned device.