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  • Author: Magdalena Mazur x
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Quality Assurance Processes in Series Production of Car Elements

Abstract

The paper presents partial results of qualitative analyzes conducted on the production line in the automotive industry. The subject of analyzes is the safety element for motor vehicles and meeting the quality requirements. The quality requirements that the manufacturer must meet are based on customer guidelines (automotive concern) for components manufactured for first assembly. The presented analyzes relate to the identification of production discrepancies and the results of statistical analyzes for the cutting process and component control for one type of cable.

This work contains basic issues in the field of production management for elements intended for the automotive market, detailing the basic applicable rules and standards in this field. It also contains the results of the analysis and evaluation of the production process of the company operating on this market. A preliminary analysis of the causes of production problems and statistical analysis for the indicated process was presented.

Open access
Analysis of Weldings’ Incompatibility in Constructions

Abstract

The paper presents an analysis of the causes and consequences of nonconformity that has been made in the welding of structural elements. The most frequent incompatibilities in this process were identified and RPN determined for them. The implementation of corrective and preventive actions in the identified critical areas was suggested based on the conducted analysis. After the implementation of corrective actions the re-calculation of the value of the RPN has been made. The paper presents the importance of visual inspection in the process of supervising finished products from the construction welding process. Elements of selected processes carried out in welded structures over two months were analyzed.

Open access
LEAN Production issues in the organization of the company - the first stage

Abstract

Today’s market determinants and most importantly, very dynamically changing customer requirements significantly shortened the product life cycle. This situation reflects in companies by common extension of the assortment offered and personalised serial production. The result of a flexible approach to market changes is the implementation of LEAN concept, which, both in terms of management and production aims to develop efficiency within an organisation, which will then enable quick and dynamic response to changes in the environment. The popularity of LEAN concept (in management and production) among managers comes from its universality and a wide range of instruments used to maximise the use of existing potential. The main assumptions of LEAN concept are aimed at the maximum use of an organisation’s resources, defining the activities necessary to execute an order and identifying the areas generating losses and then minimising them and eventually eliminating. LEAN concept is based on flagship-main tools for identification and modernisation of processes, the difficulty in using them results from the need to recognise and select the most effective ones that meet the expectations of a given organisation. The article presents issues related to the first stage of implementing LEAN concept in a company’s structures, i.e. identification of opportunities and selection of appropriate tools.

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LEAN Production issues in the organization of the company - results

Abstract

The key to the functioning of enterprises in today's market is the concept of flexibility, which is mainly associated with adapting to very dynamically changing customer requirements. The basis for this approach is, among others, the realisation of serial production, products created for the customer's order in the quantity and time defined in orders. The LEAN Managemnt and LEAN production approach is a solution dedicated to meeting market assumptions. The LEAN concept, which both in the organization of production and management is focused on dynamic response to changes in the environment. The term LEAN represents numerous improvements to the organization, tools and techniques used to reduce and eliminate individual processes (or parts thereof) that are unnecessary activities. The key to analysing entire processes and defining unnecessary activities is thorough observation and selection of dedicated solutions. In the set of LEAN tools, you can find a lot of possibilities, from organization of a workstation itself, to a thorough quantitative analysis of times and process sequences, from simple facilities to complex technological solutions. The article presents the results of the assembly process analysis, indicates the point of product differentiation (marking for the client) and presents the map of organizational and preparatory activities for this process. The presented results are part of the activities within organization of the LEAN approach, currently having priority for the Research entity organisation improvement team.

Open access
Taxonomic importance of seed morphology of Veronica L. subsect. Agrestes Benth. (Plantaginaceae)

Abstract

The study was conducted on five species of Veronica L. subsection Agrestes occurring in Central Europe: Veronica agrestis L., V. polita Fr., V. opaca Fr., V. persica Poir. and V. filiformis Sm. These species are very similar morphologically and are often misidentified. Last thorough studies of morphology and micromorphology of their seeds were conducted in 1960s. Based on 48 herbarium specimens, we examined SEM images of 422 seeds. We found that 22 of the 30 studied morphological traits differentiated five species at statistical level and V. agrestis and V. persica differed with the greatest number of features from other species. Our measurements of seed size were not fully congruent with previous studies, suggesting dependence of these features on external conditions. Seeds were usually cochlidiospermous and ovoid with a reticulate-verrucate seed coat, but these features were, at the same time, quite variable. The results of discriminant function confirmed that some characters of the seed size, shape and coat sculpture could be taxonomically useful in distinguishing species of Veronica subsect. Agrestes. In addition, we believe that similarity of the examined seeds may confirm unity of this group and the need of identifying a subsection.

Open access
The Quality Assurance of Cast and Wrought Aero Jet Engine Components Made from Ni-base Superalloys with Using of Quantitative Metallography Methods and Alloys Lifetime Prediction

Abstract

The Ni-base superalloys are used in the aircraft industry for the production of aero engine most stressed parts, turbine blades or turbine discs. Quality of aero jet engine components has a significant influence on the overall lifetime of a jet engine as itself as well as the whole airplane. From this reason a dendrite arm spacing, grain size, morphology, number and value of γ′-phase are very important structural characteristics for blade or discs lifetime prediction. The methods of quantitative metallography are very often used for evaluation of structural characteristics mentioned above. The high-temperature effect on structural characteristics and application of quantitative methods evaluation are presented in this paper. The two different groups of Ni-base alloys have been used as experimental material: cast alloys ZhS6K and IN713LC, which are used for small turbine blades production and wrought alloys EI 698VD and EI 929, which are used for turbine disc production. Selected alloys have been evaluated in the starting stage and after applied heat-treatment at 850°C for 24 hrs. This applied heat-treatment causes structural changes in all alloys groups. In cast alloy dendritic structure is degraded and gamma prime average size has grown what has a negative influence on turbine blade creep rupture life. Wrought alloys show partially grain boundary melting and grain size changed due to recrystallization what causes mechanical properties decreasing – ultimate tensile strength mainly.

Open access
Influence on the Quality of Secondary Aluminum Alloy Casts by Mn Addition

Abstract

The quality of aluminum casts is necessary in order to reach sufficient properties required for application. The decreasing in the properties of aluminum cast mainly related with microstructure, especially with size and morphology of second phases. One of such second phases in aluminum alloys are the β-phases. These phases are unwonted mainly because of the decreasing of mechanical properties. The contribution is deal with influence of addition of Mn to affecting the formation of β-phases in the AlSi7Mg0.3 and AlSi7Mg0.6 cast alloys. These materials are used for application especially automotive industry. The results shows, that addition of Mn is not sufficient for affecting of formation of the Fe-rich phases in AlSi7Mg0.6 cat alloys, but in the AlSi7Mg0.3 this addition lead to changes in formation of Fe-rich intermetallic phases.

Open access
Evaluation of comprehensive ambulatory rehabilitation of people over 60 years of age

Abstract

Introduction. The provision of adequate health care for a successively growing group of geriatric patients requires taking into account many factors in order to preserve and/or improve their overall health and the related functional capacity. Its crucial aspects include the ability to safely change position and locomotion, as well as the severity of discomfort from the osteoarticular system.

Aim. The objective of the present study was to assess the impact of comprehensive ambulatory rehabilitation including tailored endurance training, preceded by an ergospirometry test, on indicators showing the risk of falls and the severity of pain symptoms of patients aged 60 and over, receiving health services at the Outpatient Healthcare Home (DDOM).

Material and methods. The study involved 60 seniors during their rehabilitation cycle implemented as part of the services provided to patients at DDOM of the W. Chodźko Institute of Rural Health in Lublin. The tests were carried out in the test-retest model on the first and last day of the kinesiotherapy cycle. The Tinetti scale of the risk of falls, balance and walk and Visual Analogue Scale of the severity of pain sensations (VAS) were utilized in the research. The patient rehabilitation program at the DDOM included adapted systemic kinesiotherapy (endurance training with a load determined according to individual exercise capacity, as determined on the basis of the ergospirometry test) and local kinesiotherapy as well as physical therapy adapted to the needs resulting from the condition of the musculoskeletal system.

Results. After completing the rehabilitation cycle, the patients obtained higher scores, compared to the tests carried out before the beginning of the rehabilitation cycle, in the scales of Tinetti Questionnaire. There were also lower results of the respondents in VAS scale used to assess the severity of pain sensations.

Conclusions. As a result of the rehabilitation program applied, DDOM patients simultaneously obtained the desired changes in minimizing the risk of falls, improving the ability to maintain balance and fitness while walking, as well as reducing the severity of pain sensation.

Open access
Impact of the comprehensive outpatient rehabilitation on reducing intensification of depressive symptoms in people over 60 years of age

Abstract

Introduction. As a result of involution processes and diseases, changes occur in the human body, as a result of which, psychophysical fitness declines with age. Comprehensive rehabilitation is the way of improving and maintaining health condition, including, among others, the appropriate level of physical activity and the quality of affective functioning. This type of program was carried out as part of the Outpatient Healthcare Home (DDOM) at the Witold Chodźko Institute of Rural Health in Lublin.

Aim. The objective of the present study was to assess the impact of comprehensive ambulatory rehabilitation, including tailored endurance training preceded by an ergospirometry test, on indicators demonstrating the level of involvement in daily physical activities and the severity of depressive symptoms of patients over 60 years of age receiving health services at DDOM.

Material and methods. The study involved 60 seniors participating in the rehabilitation cycle implemented as part of the services provided to patients at DDOM of the Witold Chodźko Institute of Rural Health in Lublin. The tests were carried out in the test-retest model on the first and last day of the kinesiotherapy cycle. The tests were performed with use of International Physical Activity Questionnaire IPAQ and Geriatric Depression Scale GDS. The patient rehabilitation program included adapted systemic kinesiotherapy (endurance training with a load determined according to individual exercise capacity, as determined on the basis of the ergospirometry test) and local kinesiotherapy and physical therapy adapted to the needs resulting from the condition of the musculoskeletal system.

Results. After the completion of the rehabilitation cycle we compared the tests carried out before it, and the patients received higher scores in the scales of IPAQ questionnaire for measuring weekly, intensive and mode-rate physical activity and time required for walking and were less likely to spend their time sitting or lying down. There were also lower scores of the respondents in GDS scale used to assess the severity of depressive symptoms.

Conclusions. As a result of the rehabilitation program applied, DDOM patients simultaneously obtained the desired changes in the level of involvement in physical activity and minimization of the intensity of depressive symptoms.

Open access