S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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S&M2707 Research Paper of Special Issue

Component Placement Process Optimization for Multi-head Surface Mounting Machine Using a Hybrid Algorithm

Cheng-Jian Lin and Chun-Hui Lin

(Received April 25, 2021; Accepted August 24, 2021)

Keywords: multi-head placement machine, nearest neighbor search, scheduling optimization, printed circuit board, pick-and-place sequence problems

This paper addresses the optimization problem of printed circuit board (PCB) assembly scheduling for surface mount placement (SMP) machines with multiple heads. Most of the related studies have oversimplified the practical problems and limited their focus to three sub-problems: the feeder assignment problem, the nozzle setup problem, and the component pick-and-place sequence problem. To extend the range of problems that can be addressed, in this study we propose a hybrid algorithm to consider the component height, the pick-and-place restrictions, and simultaneous pickup restrictions. A roulette wheel is designed to generate an automatic nozzle changer sequence, with the nearest neighbor search used to find an initial placement path. Furthermore, we apply the 2-optimization (2-opt) method to improve the placing sequence. Practical PCB datasets provided by an EVEST EM-780 multi-head SMP machine are adopted as experimental examples. Experimental results show that the proposed algorithm effectively enhances the productivity of the multi-head SMP machine and reduces the cycle time in PCB assembly.

Corresponding author: Cheng-Jian Lin




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