Sintering Device Delimitation Wall for Electronic Assembly

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Solution Overview

Problem

Sintering devices for electronic assemblies face issues with edge damage due to heavy deformation of pressure pads, which can cause lateral deflection and damage during high-pressure applications.

Innovation Solution

A sintering device design featuring a lower die and an upper die with a delimitation wall system that allows the pressure pad to be displaced towards the lower die, preventing lateral deflection by converting displacement forces into compression pressure, and using a hydrostatic sintering mechanism to apply adjustable pressure on the assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a pressure pad with a contour corresponding to the assembly is used, then enclosure of the assembly is achieved, but lateral deflection of the pressure pad occurs under high pressure causing edge damage

Engineering Contradiction:

Improveenclosure precisionVSAvoidedge damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The delimitation wall is divided into an outer delimitation wall and an inner delimitation wall that can slide relative to each other. This segmentation allows the pressure pad to be contained while the inner wall can move to accommodate pressure changes without causing lateral deflection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The inner delimitation wall is made movable relative to the outer delimitation wall, allowing the structure to dynamically adjust under pressure. This dynamic capability prevents the pressure pad from laterally deflecting while maintaining enclosure precision.

Inventive Principle:

Principle #15Dynamics

2Reliability

If high pressure is applied to the pressure pad, then sintering effectiveness is improved, but lateral deflection and edge damage increase

Engineering Contradiction:

Improvesintering effectivenessVSAvoidedge damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The inner delimitation wall acts as an intermediary between the pressure pad and the outer delimitation wall. It absorbs and redirects the lateral forces generated under high pressure, preventing direct transmission of these forces to the pressure pad edges.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The sliding mechanism converts the harmful lateral deflection forces into beneficial vertical sliding motion of the inner delimitation wall, allowing high pressure to be applied without causing edge damage.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Stress or pressure

If the pressure pad is heavily deformed, then sintering pressure is achieved, but edge damage to components occurs

Engineering Contradiction:

Improvesintering pressureVSAvoidedge damage

Core Design Contradiction:

Stress or pressureVSObject-affected harmful factors

Solution Approach 1:

The problem is solved by adding a vertical dimension to the delimitation wall structure. The inner delimitation wall can slide vertically relative to the outer wall, providing an additional degree of freedom that prevents lateral deflection while maintaining necessary pressure.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 solution effectively prevents lateral deflection of the pressure pad, ensuring a robust and damage-free sintering process by converting displacement forces into compression pressure, allowing for a quasi-hydraulic sintering pressure that can be modified within arbitrary limits, thus enhancing the sintering quality and reducing edge damage.

Implementation Method 1

the inner delimitation wall is mounted so as to be slidable towards the outer delimitation wall and, when pressure in the direction of the upper die is exerted on the pressure pad, is mounted so as to be slid in the direction of the lower die

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

a pressure pad for exerting pressure directed towards the lower die

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 3

the upper die and the lower die being slidable towards one another and preferably each having a dedicated heating unit

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS10483229B2Sintering device

Publication Date: 2019.11.19 DANFOSS SILICON POWER GMBH

AI summary

Sintering device for sintering at least one electronic assembly, having a lower die and an upper die which is slidable towards the lower die, or a lower die which is slidable towards the upper die. The lower die forms a support for the assembly to be sintered and the upper die includes a receptacle for a pressure pad for exerting pressure directed towards the lower die, and a delimitation wall which laterally surrounds the pressure pad. The delimitation wall having an outer delimitation wall and an inner delimitation wall surrounded by the outer delimitation wall, the inner delimitation wall mounted so as to be slidable towards the outer delimitation wall and so as to be slid in the direction of the lower die such that, following the placing of the inner delimitation wall on the lower die, the pressure pad is displaceable in the direction of the lower die.