Reflow Heating Control for Mixed-Heat-Capacity Components
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Solution Overview
Problem
In reflow soldering, components with different heat capacities on a substrate face challenges where the component with smaller heat capacity is overheated, while the larger heat capacity component remains unmelted, leading to uneven heating and prolonged soldering times, and existing solutions complicate the reflow device with limited component positioning and increased size.
Innovation Solution
A reflow device with multiple heating sections and a controller that alternately increases and reduces the temperature of components to maintain the smaller heat capacity component above the solder's melting point while bringing the larger heat capacity component to the melting point, using a booth with exhaust flow paths to equalize temperatures and simplify the device configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single heating section is used for reflow soldering, then the device configuration is simple, but components with different heat capacities experience uneven heating where smaller components are overheated and larger components remain unmelted
Solution Approach 1:
The heating system is divided into multiple independent heating sections (first heating section and second heating section) that can be controlled separately. Each heating section targets specific components based on their heat capacity requirements, allowing the smaller heat capacity component to be heated by one section while the larger heat capacity component is heated by another section, thereby achieving uniform temperature distribution across components with different thermal characteristics.
2Manufacturing precision
If multiple heating sections with different temperatures are used to address different component heat capacities, then temperature uniformity is improved, but the device size and complexity increase
Solution Approach 1:
Multiple heating sections are arranged to share common structural elements such as the booth, control system, and exhaust flow paths. The heating sections are integrated within a single reflow device structure, allowing them to operate cooperatively rather than as separate units. This merging approach enables temperature uniformity across different components while avoiding the need for multiple independent heating devices.
3Productivity
If traditional single-temperature heating is used, then the device configuration remains simple, but the heating time is prolonged due to the need to accommodate the largest heat capacity component
Solution Approach 1:
Each heating section is configured with specific temperature characteristics suited to the components it serves. The first heating section operates at a temperature appropriate for smaller heat capacity components, while the second heating section operates at a temperature optimized for larger heat capacity components. This localized temperature optimization allows each component to be heated efficiently at its required temperature, significantly reducing the overall heating time compared to using a single high-temperature heating section for all components.
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 ensures uniform heating of solder across the substrate, reduces heating time, and simplifies the reflow device configuration by maintaining the smaller heat capacity component at or above the melting point while increasing the larger heat capacity component to the melting point, stabilizing solder quality and reducing heating time.
Implementation Method 1
Each of the heating sections applies gas to a substrate so as to increase a temperature of the first component and a temperature of the second component
Implementation Method 2
The exhaust flow path and the exhaust opening allow the gas applied from each of the heating sections to exhaust
Data Source
AI summary
A reflow device configured to perform reflow soldering on a substrate having a first component and a second component having a heat capacity larger than a heat capacity of the first component. The reflow device includes a plurality of heating sections applying gas to the substrate, a booth accommodating the heating sections, and a controller configured to perform, at least twice or more times, a heating control of controlling the heating sections to increase both of a temperature of the first component and a temperature of the second component, and then reduce the temperature of the first component while increasing the temperature of the second component.