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1

Influence of temperature based process parameter compensation on process efficiency and productivity

Pater Jerzy, Basara Damian, Stadnicka Dorota

Technologia i Automatyzacja Montażu

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2021

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nr 2

44--51

PL

Warunki w środowisku pracy związane np. zapyleniem, wibracjami lub temperaturą mogą mieć negatywny wpływ zarówno na proces produkcyjny, jak i na wytwarzany produkt. Nieodpowiednie i niestabilne warunki mogą powodować niestabilność procesu produkcyjnego i pogarszać jakość wytwarzanych wyrobów. Co więcej, może to spowodować stratę czasu i zmniejszyć wydajność i produktywność. W artykule przeanalizowano problem wpływu temperatury na proces produkcyjny. Monitorowanie temperatury nie wystarczy, aby zapewnić osiągnięcie celów produkcyjnych. Konieczne jest odpowiednie dostosowanie parametrów procesu produkcyjnego, aby nie powstawały niezgodności wynikające ze zmian wartości temperatury i aby nie pojawiały się opóźnienia. Artykuł dotyczy wydajności i produktywności systemu produkcyjnego, który pracuje w niestabilnym środowisku pracy. Autorzy udowadniają, że zastosowanie kompensacji parametrów procesu produkcyjnego może znacząco poprawić zarówno wydajność, jak i produktywność. Wartości wydajności i produktywności były monitorowane w ustalonym okresie czasu dla systemu produkcyjnego, na którym realizowany jest proces produkcyjny. Następnie wprowadzono procedurę kompensacji parametrów procesu. Po czym, w określonym przedziale czasu zebrano dane i porównano wartości wydajności i produktywności z wartościami uzyskanymi wcześniej. Dodatkowo autorzy proponują wprowadzenie wskaźnika całkowitej efektywności wyposażenia (OEE) i w artykule przedstawiono informacje o sposobach zbierania danych dla obliczenia OEE.

EN

Conditions in the working environment related e.g. to dust, vibration or temperature may have a negative impact on both, the production process and the manufactured product. Inappropriate and unstable conditions can cause instability of the production process and deteriorate the quality of manufactured products. Moreover, this can induce time waste and decrease the efficiency and productivity. In this paper the problem of temperature influence on a manufacturing process is analyzed. Monitoring of the temperature is not enough to ensure the achievement of manufacturing goals. It is necessary to adapt the parameters of the production process accordingly so that no nonconformities arise due to changes in temperature values and no delays appear. This paper deals with the efficiency and productivity of a manufacturing system which work under unstable working environment. The authors prove that application of the manufacturing process parameters compensation can significantly improve both, efficiency and productivity. The values of efficiency and productivity were monitored within a fixed period of time for a manufacturing system, on where the manufacturing process is realized. Then, a procedure of process parameters compensation was introduced. Next, within a fixed period of time the data were collected and the efficiency and productivity values were compared with the values obtained before. Additionally, the authors propose to introduce the Overall Equipment Effectiveness (OEE) indicator and present information about ways of data collecting.

2

The process capability study by the flange shaft production

Lestyánszka-Škurková Katarína, Pauliková Alena

Quality Production Improvement - QPI

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2021

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Vol. 3, Iss. 1

305--313

EN

Ensuring the process0capability currently means the warranty, that produced products will be0in accordance with requirements – from company´s side or from customer´s side. This study focuses on the statistical control of flange shaft proces capability by serial production0in company focused on products for automotive. The flange shaft proces is evaluated by control charts,0specifically by control chart for average and range ([iks z kreską poziomą u góry], R). As the results showed, based on diagram for average and range we are able0to say that the turning process is under the statistical control. Also, we had finished the0reguest for capability of process, where0the indexes of capability process Cpk1 and Cpk2 are higher than the determined value on 1.33 point. The normality of the measured values was verified by histogram. Obtained values are: Cpk1 = 1.645 a Cpk = 1.52. Therefore, we can consider the process as capable.

3

5 Cs of Investment Casting Foundries in Rajkot Cluster – An Industrial Survey

Sata A. V., Maheta Nikunj R.

Archives of Foundry Engineering

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2021

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Vol. 21, iss. 3

102--108

EN

Investment casting is very well-known manufacturing process for producing relatively thin and multifarious industrial components with high dimensional tolerances as well as admirable surface finish. Investment casting process is further comprised of sub-processes including pattern making, shell making, dewaxing, shell backing, melting and pouring. These sub-processes are usually followed by heat treatment, finishing as well as testing & measurement of castings. Investment castings are employed in many industrial sectors including aerospace, automobile, bio-medical, chemical, defense, etc. Overall market size of investment castings in world is nearly 12.15 billion USD and growing at a rate of 2.8% every year. India is among the top five investment casting producer in the world, and produces nearly 4% (considering value of castings) of global market. Rajkot (home town of authors) is one of largest clusters of investment casting in India, and has nearly 175 investment casting foundries that is almost 30% of investment casting foundries of India. An industrial survey of nearly 25% of investment casting foundries of Rajkot cluster has been conducted in the year 2019-20 in order to get better insight related to 5 Cs (Capacity; Capability; Competency; Concerns; Challenges) of investment casting foundries located in the cluster. Specific set of questionnaires was design for the survey to address 5 Cs of investment casting foundries of Rajkot cluster, and their inputs were recorded during the in-person survey. The industrial survey yielded in providing better insight related to 5 Cs of foundries in Rajkot cluster. It will also help investment casting producer to identify the capabilities and quality issues as well as leads to benchmarking respective foundry.

4

Samozaleczanie i samonaprawa betonu

Łukowski P., Adamczewski G.

Inżynieria i Budownictwo

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2017

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R. 73, nr 8

421--424

PL

Przedstawiono koncepcję samozaleczania i samonaprawy betonu. Omówiono mechanizmy oraz sposoby sterowania tymi zjawiskami. Zwrócono uwagę na zastosowanie rozproszonych nośników substancji naprawczej, w tym możliwość wykorzystania żywicy epoksydowej bez utwardzacza. Wskazano dotychczasowe osiągnięcia oraz problemy do rozwiązania, wytyczające niezbędne kierunki dalszych badań w tym zakresie.

EN

The paper deals with the idea of self-healing and self-repair of cement concrete. The mechanisms of these phenomena have been described together with the methods of their controlling. The particular attention has been paid to the use of dispersed carriers of the repair mean, including the possibility of application of epoxy resin without a hardener. The present achievements have been pointed out as well as the problems to resolve.

5

The effect of selected strains of Trichoderma spp. on seeds sowing value and vigour of blue lupin

Panasiewicz K., Koziara W., Faligowska A., Wolna-Maruwka A.

Journal of Research and Applications in Agricultural Engineering

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2016

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Vol. 61, nr 4

89--91

EN

Laboratory analyses were performed at the Department of Agronomy, the Poznań University of Life Sciences. Experiments were conducted on two strains of Trichoderma ssp. to investigate the aftereffect of sprinkling irrigation of blue lupin plants and seed soaking time (20, 40, 60 min). Results indicate a significant effect of Trichoderma ssp. strain and sprinkling irrigation on basic parameters of the value and vigour of blue lupin seeds. The greatest values of germinating energy and germination capacity were recorded after the application of the strain T. atroviride. Sprinkling irrigation deteriorated seeds sowing value and seed vigour in blue lupin. Seed soaking time did not modify germination energy or germination capacity, while significant differences were found in the seedling growth test, seedling growth rate test and the vigour index.

PL

Badania laboratoryjne wykonano w Katedrze Agronomii Uniwersytetu Przyrodniczego w Poznaniu. Doświadczenia uwzględniały dwa szczepy Trichoderma ssp., następczy wpływ deszczowania roślin łubinu wąskolistnego oraz czas moczenia nasion (20, 40, 60 min). Uzyskane wyniki wskazują na istotny wpływ szczepu Trichoderma ssp. oraz deszczowania na podstawowe parametry wartości siewnej oraz wigor nasion łubinu wąskolistnego. Najwyższą energię i zdolność kiełkowania odnotowano po zastosowaniu szczepu T. atroviride. Deszczowanie pogarszało jakość siewną i wigor nasion łubinu wąskolistnego. Czas moczenia nasion nie wpływał na energię i zdolność kiełkowania, ale istotne różnice stwierdzono w przypadku testu wzrostu siewki, testu szybkości wzrostu siewki oraz indeksu wigoru.

6

Possibilities of seed quality improvement in Miscanthus sinensis (Andersson)

Orzeszko-Rywka A., Rochalska M.

Journal of Research and Applications in Agricultural Engineering

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2016

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Vol. 61, nr 4

84--88

EN

Miscanthus sinensis (Andersson) is a perennial grass producing high amounts of biomass. I It can be used for energetic purposes through burning or biogas production. A main problem in this crop cultivation consists in vegetative, expensive method of propagation. First preliminary research on seed quality improvement is carried out in order to enable propagation on a large scale. The object of presented experiment was to find out the reason for low germination ability and to search methods of seed quality improvement. Miscanthus seeds were treated with sodium hypochlorite, commercial micronutrients seed fertilizer and commercial bacteria seed treatment, ash and plasma. The ability and speed of germination and root and shoot length were measured. Tetrazolium test and microscopic observations of seeds were done. Fragility and susceptibility to damage and low vitality of embryos mean that further work is needed on the genetic characteristics and methods of seed harvesting as well as postharvest processing of this species.

PL

Miskant chiński jest wieloletnią trawą wytwarzającą duże ilości biomasy. Jest użytkowany w celach energetycznych poprzez spalanie lub produkcję biogazu. Problemem w upowszechnieniu tej uprawy jest wegetatywny, drogi sposób rozmnażania. Trwają pierwsze prace nad poprawą jakości nasion miskanta, tak aby rozmnażanie generatywne na szeroką skalę było możliwe. Celem przedstawionych badań było określenie przyczyn niskiej zdolności kiełkowania nasion oraz poszukiwanie metod poprawy ich wartości siewnej. Nasiona miskanta były traktowane chlorkiem sodu, preparatami bakteryjnymi i mikroelementami, popiołem a także plazmą. Badano zdolność i szybkość kiełkowania oraz długość korzeni zarodkowych i kiełków. Na nasionach wykonano także test tetrazolinowy oraz obserwacje mikroskopowe. Kruchość nasion i podatność na uszkodzenia oraz niska żywotność zarodków powodują, że konieczne są dalsze prace dotyczące cech genetycznych i metod zbioru i czyszczenia nasion tego gatunku.

7

Impact of multi-task on symptomatic patient affected by chronical vestibular disorders

Regrain E., Regnault P., Kirtley Ch., Shamshirband S., Chays A., Boyer F.-C., Taiar R.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 3

123--129

EN

Purpose: After a vestibular deficit some patients may be affected by chronical postural instability. The aim of this study was to identify the emotional and cognitive factors of these symptomatic patients. In particular, the double cognitive task and the anxiety disorder were identified by our patients. Through a retrospective study, 14 patients (65.4 ±18 years) participated in the experiment. Method: The experimentation consists in the study of the standing position of our patients through the aggregate of the trajectories of the center of pressure (COP) using a force plate device. With the aim of isolating the emotional and cognitive influence, this experimentation was defined in two conditions. In the first one, the patients were asked to maintain their balance without additional tasks. In the second one, the patients were submitted to an additional cognitive arithmetic task. The stabilogram surface, length (the forward and backward displacement distance during deviations in COP), lateral and the antero-posterior deviations were assessed. Results: Our results showed an increase of postural instability of patients affected by chronical vestibular disorders when submitted to the double task. The patients submitted to the cognitive task present a larger surface of activity in comparison with the free-task one (Wilcoxon test p-value equals p = 0.0453). In addition, their displacements inside this area are more important (p = 0.0338). The COP of all our patients deviated forward in the presence of the double task. Conclusion: The increase in instability during the double cognitive task could be explained by an additional stress caused by the desire to make a success of the cognitive task.

8

The stapling of material layers process capability study by the production of the product "MULTIAXIAL"

Lestyanszka-Skurkova K.

Production Engineering Archives

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2015

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Vol. 6, No. 1

10--13

EN

Ensuring the process capability currently means the warranty, that produced products will be in accordance with requirements - from the company or customer´s side. This study focuses on the statistics control of stapling of material layers process capability by production of the product "multiaxial". The stapling of material layers process is evaluated by control charts, specifically by control charts for average and range(, R). As the results show, on the basis of the diagram for average and range we are able to say that the process is under the statistical control. We had also finished the reguest for capability of process, where the indexes of capability process Cp and Cpk are higher than the determinated value by 1,33 points. The obtained values are: Cp = 1,68 a Cpk = 1,55. X

9

Is math a gift?

Bartošová B.

Scientific Issues of Jan Długosz University in Częstochowa. Mathematics

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2014

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Vol. 19

25--28

EN

“I am just not a math person” is a sentence we can hear very often these days. Students use it as an excuse any-time they do not know or understand anything. But is Maths really some gift a person gets or is not? Or is it more like ability which can be improved if practised enough? This is a brief preview of what do the Czech, Slovak and also foreign authors think of this issue.

10

Building innovation capability for libyan firms, taking advantage of polish firms’ experiences

Hanini M., Bagiński J.

Management Systems in Production Engineering

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2014

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nr 1 (13)

27--32

EN

Big changes observed on the market nowadays are forcing companies to choose to innovative solutions aimed at reducing the time of delivery, efficiency and quality. This is essential for the survival of these companies. For this reason, there is a need for continuous assessment of the strengths and weaknesses of the company as well as improve its capability to innovate at the operational level. In this paper we discussed an example of the use of a method called Complex Solutions Operations (Total Operations Solutions), [2] the ability to self‐assessment in selected Libyan companies using the experience of Polish enterprises.

PL

Wielkie zmiany obserwowane na rynku zmuszają przedsiębiorstwa do wyboru innowacyjnych rozwiązań ukierunkowanych na redukcję czasu dostawy, efektywność oraz na jakość. Jest to warunkiem przetrwania tych przedsiębiorstw. Z tego powodu pojawia się potrzeba ciągłej oceny mocnych i słabych stron przedsiębiorstwa jak również poprawy jego zdolności w zakresie tworzenia innowacji na poziomie operacyjnym. W tej pracy omawiany jest przykład wykorzystania metody zwanej Kompleksowe Rozwiązania Operacyjne (Total Operations Solutions), do samooceny tych zdolności w wybranych przedsiębiorstwach libijskich z wykorzystaniem doświadczeń przedsiębiorstw polskich.

11

Supply chain risk management

Hollstein C., Himpel F

LogForum

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2013

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Vol. 9, no. 1

21--25

EN

Background: Supply chain risk management increasingly gains prominence in many international industries. In order to strengthen supply chain structures, processes, and networks, adequate potentials for risk management need to be built (focus on effective logistics) and to be utilized (focus on efficient logistics). Natural-based disasters, such as the case of Fukushima, illustrate how crucial risk management is. Method: By aligning a theoretical-conceptual framework with empirical-inductive findings, it may be hypothesized that logistical systems do have a positive effect on supply chain risk management activities. Result/conclusion: Flexibility and capacity, as well as redundancy and standardization, are often viewed as being conflictionary. It shows, however, that in the light of supply chain risk management, those factors may yield a common benefit if proper logistics systems are applied.

PL

Wstęp: Zarządzania ryzykiem łańcucha dostaw zyskuje coraz większe znaczenie w wielu międzynarodowych branżach. W celu wzmocnienia struktur łańcucha dostaw, procesów i sieci, należy stworzyć odpowiednie potencjały dla zarządzania ryzykiem (skoncentrowane na efektywnej logistyce) a następnie je stosować (koncentrując się na wydajnej logistyce). Katastrofy naturalne, takie jak na przykład ostatnio Fukushima, pokazują jak istotne jest odpowiednie zarządzanie ryzykiem. Metody: Zestawiając teoretyczno-koncepcyjne założenia z rezultatami emipryczno-indukcyjnymi, można postawić hipotezę, że systemy logistyczne posiadają pozytywny efekt na zarządzanie ryzykiem łańcucha dostaw. Wyniki i wnioski: Elastyczność i wydajność, jak również redukcja i standaryzacja, są często postrzegane jako elementy konfliktowe. Aczkolwiek, rozważając zagadnienia związane z zarządzaniem ryzykiem łańcucha dostaw, czynniki te mogą przyczynić się do wspólnie osiągniętych korzyści, pod warunkiem prawidłowo skonstruowanych systemów logistycznych.

12

Assessment of Psychophysical Abilities of People with Disabilities During Occupational Rehabilitation

Kurkus-Rozowska B., Najmiec A., Tokarski T., Konarska M.

International Journal of Occupational Safety and Ergonomics

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2000

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Zeszyt Specjalny

127--134

EN

Designing objective and subjective methods of studying the abilities of disabled people is one of the most important things to be done before employing them. That is why new assessment methods are proposed. Evaluation as a testing procedure used for defining the abilities of disabled people - general capacity, range, and strength of the main groups of muscles and extremities, psychological tests, and many others-were developed by an interdisciplinary team. In total, 48 testing procedures, including physiological, psychological, and biomechanical ones, were prepared. We also propose another subjective assessment method because it is also very important to know what an individual person with disability needs, wants to do, or what kind of job he or she prefers. The subjective evaluation of abilities, possibilities, and needs might be done by using a questionnaire. These testing procedures offer a chance to use the same methods in all diagnostic centres so the criteria of health and work ability will be the same and easily comparable. Using the same tests for assessment will be helpful in observing the results and progress of medical, social, and vocational rehabilitation, too.