Automated Lead Trimming Module for Mixed PCBs
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Solution Overview
Problem
In mixed technology applications on printed circuit boards, where both surface mount technology (SMT) and plated through-hole (PTH) components are used, manual lead trimming is necessary due to interference from SMT components, which complicates the single pass trimming process for PTH leads.
Innovation Solution
An automated lead trimming system utilizing a XYZ gantry robot and a lead trimming module with a pneumatic actuator and rotation motor assembly, capable of selectively trimming leads to programmed lengths and angles, while a vacuum hose collects trimmed leads to avoid interference with surrounding components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single pass lead trimming process is used for PTH leads, then trimming efficiency is improved, but the process cannot be applied when SMT components are mounted on the back surface as they interfere with the trimming operation
Solution Approach 1:
The trimming process is divided into multiple passes instead of a single pass. The controller identifies and trims leads in different passes, allowing SMT components to be avoided in earlier passes and trimmed or avoided in subsequent passes. This segmentation enables the system to handle mixed technology PCBs while maintaining automated efficiency.
Solution Approach 2:
The system dynamically adjusts the trimming plan based on real-time identification of SMT components and lead positions. The controller modifies the trimming sequence and parameters adaptively, transitioning from a static single-pass approach to a dynamic multi-pass strategy that responds to the actual PCB configuration.
2Adaptability or versatility
If manual lead trimming is performed on mixed technology PCBs, then adaptability to SMT components is improved, but labor intensity and time consumption increase
Solution Approach 1:
The system performs automatic identification of SMT components and automatic generation of trimming plans without human intervention. The controller autonomously navigates the multi-pass trimming process, eliminating the need for manual inspection and planning while maintaining adaptability to mixed technology configurations.
Solution Approach 2:
The manual mechanical trimming process is replaced with an automated system that uses vision technology, algorithmic planning, and automated cutting mechanisms. This substitution eliminates manual labor while maintaining the ability to handle complex mixed technology PCBs.
3Manufacturing precision
If lead length is precisely controlled to specification, then product quality is improved, but additional trimming operations are required increasing process complexity
Solution Approach 1:
The system performs preliminary identification and planning of all trimming operations before execution. By pre-mapping the PCB layout, identifying SMT components, and calculating optimal trim lengths and sequences, the system minimizes the number of actual cutting operations while ensuring precision compliance.
Solution Approach 2:
The controller dynamically adjusts trimming parameters such as cut depth, speed, and angle based on real-time feedback and pre-calculated optimal values. This parameter optimization ensures precise lead length control while minimizing the number of passes required.
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
Enables precise and efficient automated trimming of leads on double-sided PCBs, reducing manual labor and ensuring accurate lead lengths without damaging adjacent SMT components, improving production efficiency and consistency.
Implementation Method 1
a vacuum hose coupled to the trimmed lead collector, wherein the vacuum hose is configured to remove the trimmed portion of the lead received by the trimmed lead collector
Data Source
AI summary
A lead trimming module and system provides automated means for trimming leads of a mounted electrical component. A controller executes a programmable lead trimming algorithm and correspondingly controls a movement apparatus, such as an XYZ gantry robot, and mounted lead trimming module for selectively trimming lead protrusions to a programmed lead length.