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Zastosowanie logicznych drzew decyzyjnych do analizy wad w etapie lutowania na fali podczas montażu SMT

Sadowińska M.

Zarządzanie Przedsiębiorstwem

2014

Vol. 17, nr 2

26--33

Decision trees are a logical method, which graphically presents the solution of logical function. They consist of the branch on which the data are coded variables. Solutions are presented as the true path. The method used to optimize the solution functions are logical decision trees, the construction of which the principle is the same as the logical trees. They make it possible to eliminate the occurrence of twigs isolated and cut off the full beam. This procedure allows to minimize the real twigs. This is advantageous due to the phenomenon that the optimal solution is the combination of variables, which is associated with the tree having the smallest number of real branches. This tree defines the status of the variables tested from most to least important. The purpose of the study was to determine the hierarchy of defects affecting the destabilization of one of the stages of the process SMT (surface mount), which is the wave soldering, and by this determine which should be eliminated in the first place. A tool that has been used for this purpose was a logical decision trees. According to the results of the analysis in the first place should prevent the causes of the formation of solder bridges (machine failure), then-without regard to the order-of overheating the PCB and too low solder temperature (the same effects on the occurrence of errors), which are the result of poor machine settings and the occurrence of machine failure. Thanks to the possibility of using minimization of logical variables (cutting off the full beam) in practical terms, the elimination of identified defects, it is necessary to determine the corrective action regarding the causes of defects, namely the lack of solder. This approach meant that the error should not be the subject of corrective action performed. The indicating reason was responsible only for the occurrence of the lack of solder. The using of logical decision trees could help identify priorities for improvements to the wave soldering realized as part of a process of SMT assembly.

Lead Free Electronic Module Test Research for Motion Control of Cars Front Windscreen Wipers

Manukova-Marinova A., Dimov V., Levi A., Stephanov D.

Elektronika : konstrukcje, technologie, zastosowania

2009

Vol. 50, nr 6

91-95

Test control methods and electronic system analysis of an electronic system for operating front windscreen wipers of a car have been described. The module is designed for production based completely on lead-free technologies. The aim of this paper is to present product validation tests and production process adaptability before starting mass production. Ali tests and analyses are in compliance with ISO/TS 16949 quality standards and requirements in the automobile industry, and IPC A610-D electronic products reliability standards.

Opisane są metody kontroli i analizy modułu elektronicznego sterowania silnika uruchomiajacego wycieraczki szyby przedniej samochodu osobowego. Moduł sterowania jest zaprojektowany do produkcji technologią bezołowiową. Celem artykułu jest przedstawienie wyników testów walidacji produktu i zgodność procesów przed uruchomieniem produkcji masowej. Wszystkie testy i analizy są wykonane zgodnie z wymaganiami normy sterowania jakości w przemyśle samochodowym - ISO/TS 16949 oraz normy zgodności wyrobów elektronicznych IPC A610-D.