Solder Management System with Weighted Time Measurement
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Solution Overview
Problem
The existing solder printing technologies fail to accurately manage the drying time of solder paste on a screen mask, leading to insufficient bonding between electronic components and boards, resulting in defective boards due to the varying degrees of dryness when solder is exposed to air and not considered in the measurement of elapsed time.
Innovation Solution
A printing device and solder management system that includes a timer and determination unit to measure and manage the allowable time for solder paste on a screen mask, weighing the time it is moved versus the time it is stationary to accurately determine when the solder has dried excessively, and notify workers to prevent further processing when the allowable time is exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solder is supplied to the screen mask and exposed to air, then the solder gradually dries, but the bonding strength becomes insufficient when the solder dries too much
Solution Approach 1:
The system performs preliminary measurement of the elapsed time from solder supply to printing, and preliminarily determines whether the solder has dried too much before the actual printing process. This prevents the harmful effect of excessive drying by detecting it in advance, allowing the system to stop work and notify operators before bonding quality deteriorates.
Solution Approach 2:
The system continuously monitors the elapsed time and provides feedback to determine if the solder has exceeded the allowable drying time. When the solder is determined to have dried too much, the system provides feedback by stopping work and notifying operators, creating a closed-loop control that maintains bonding strength within acceptable ranges.
2Measurement precision
If a simple timer is used to measure elapsed time, then the measurement is straightforward, but it cannot distinguish between time when solder is moved and time when solder is stationary
Solution Approach 1:
The time measurement is segmented into two distinct periods: the first period when the solder is supplied to the screen mask and the squeegee moves, and the second period when the solder remains stationary on the screen mask. The timer separately measures each period, and the control unit uses different weighting factors for each segment to calculate the total elapsed time, achieving precise measurement without excessive system complexity.
3Productivity
If work continues without monitoring solder drying time, then productivity is maintained, but defective boards are generated due to insufficient bonding
Solution Approach 1:
The system performs preliminary determination of whether the solder has exceeded allowable drying time before defective boards are produced. By measuring elapsed time and comparing it against predetermined thresholds, the system identifies problematic solder in advance and stops work notification, preventing the generation of defective boards while maintaining productivity through targeted interruptions rather than continuous stopping.
Data Source
AI summary
A printing device includes a storage that stores allowable time for which use of solder supplied to a screen mask can be allowed, a timer that measures time for which the solder is supplied to the screen mask, a determination unit that determines whether or not the solder supplied to the screen mask has exceeded the allowable time based on time measured by the timer, and a notifier that notifies a worker in a case where the determination unit determines that the solder supplied to the screen mask has exceeded the allowable time. The timer measures time by weighting a measurement interval of time for which the solder is moved on the screen mask by a squeegee so as to become greater than a measurement interval of time for which the solder does not move on the screen mask.