Solder Paste Bead Transfer During Automated Stencil Changeover
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Solution Overview
Problem
Current stencil printers require manual intervention for routine operations such as changing stencils, replacing solder paste cartridges, and recovering solder paste from stencils scheduled for replacement, leading to inefficiencies and downtime in PCB fabrication.
Innovation Solution
A stencil printer with a solder paste bead recovery system that includes a paste pan and squeegee blade assembly to automatically remove and deposit solder paste from one stencil to another, utilizing a tooling member with a pin to move the paste pan along linear bearings and engage with receiving features for secure positioning and transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual intervention is used for stencil changeover and solder paste recovery, then operational flexibility is maintained, but productivity decreases and downtime increases
Solution Approach 1:
The system enables automated self-service through the robotic arm that autonomously performs stencil removal, paste pan positioning, and solder paste transfer operations without human intervention, resolving the contradiction by eliminating manual tasks while maintaining continuous production
Solution Approach 2:
The paste pan is pre-positioned and ready before stencil changeover begins, and the robotic arm is pre-programmed with the sequence of operations, allowing rapid automated execution that improves productivity without requiring manual setup during changeover
2Loss of substance
If manual solder paste recovery is performed, then material loss is minimized, but loss of time increases due to manual operations
Solution Approach 1:
The robotic arm replaces manual mechanical operations with automated mechanical systems, using precision positioning and controlled movement to transfer solder paste efficiently, thereby reducing both time loss and material waste simultaneously
Solution Approach 2:
The system automatically recovers residual solder paste from the old stencil and transfers it to the new stencil using the paste pan, minimizing material loss while the automated process completes the recovery in minutes rather than manual operation times
3Productivity
If automated changeover systems are implemented, then productivity increases, but device complexity increases
Solution Approach 1:
The robotic arm serves multiple functions including stencil handling, paste pan positioning, and solder paste transfer, consolidating what could be separate complex systems into a single multi-functional device, thereby improving productivity without proportionally increasing overall system complexity
Data Source
AI summary
A stencil printer is configured to print an assembly material on an electronic substrate. The stencil printer includes a frame, a stencil coupled to the frame, a support assembly coupled to the frame, and a print head gantry coupled to the frame. The print head gantry includes an elongate beam that rides along rails provided on the frame and a print head assembly supported by the print head gantry in such a manner that the print head assembly is configured to traverse the stencil during print strokes. The print head assembly includes a print head having a squeegee blade assembly configured to roll solder paste along the stencil. The stencil printer further includes a solder paste bead recovery system configured to remove a bead of solder paste from a top surface of the stencil and to deposit the bead of solder paste onto a new replacement stencil.