Analysing the reliability of working parts operating in abrasive soil pulp taking into consideration confounding factors

Mikołajczak, P.; Napiórkowski, Jerzy

doi:10.17531/ein.2016.4.9

Cited by 18 publications

(11 citation statements)

References 6 publications

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“…An investment in "on-the-job" training will be refunded soon by increased productivity and reduced down-times thanks to faster identification and recovery of failures by this way trained services [17].…”

Section: Personnel Training and Process Standardizationmentioning

confidence: 99%

Technical Aspects of Relocation of Production and Assembly Lines in Automotive Industry

Kowalski¹,

Chlebus²,

Serwatka³

2017

Intelligent Computing and Information Engineering (ICIE)

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The paper presents technical aspects of relocation of production and assembly lines. Preparatory stages of relocation, its course, planning and execution, way and process of reaching the assumed mechanical and stability parameters are described. The authors are focused on crucial issues limiting risk: securing supplies to customers by properly large inventory, personnel training and process standardization, transport activities, line assembly after relocation and reaching the target productivity. Effects of relocation on failure and productivity rates are presented. The analysis is based on the data acquired before relocation, in its course and after its completion, as well as during the stages of putting into operation and reaching the required productivity.

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Section: Personnel Training and Process Standardizationmentioning

confidence: 99%

Technical Aspects of Relocation of Production and Assembly Lines in Automotive Industry

Kowalski¹,

Chlebus²,

Serwatka³

2017

Intelligent Computing and Information Engineering (ICIE)

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“…Taking into account the nature of changes to the values of forces (duties) affecting a machine, the following were distinguished [7][8][9][10]:…”

Section: Models Of Reliability Of Multi-purpose Machines In a Historimentioning

confidence: 99%

Models of Reliability of Multi-Purpose Machines in a Historical Perspective

Napiórkowski¹,

Szczyglak²

2017

Intelligent Computing and Information Engineering (ICIE)

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The basic function characteristic of the reliability of the multi-purpose machines is the mathematic model describing the characteristics of the time of the correct functioning. The subjects of the research were the wheat harvesters produced nowadays, and the harvesters produced in the 80's. During the research, the time of the correct functioning has been registered along with the time of repair in the agrotechnological season and the potential cause of the break has been identified. Whilst selecting the mathematic models for the reliability of the machines produced in specific times of exploitation, the analysis of damage causes has been created. Based on the results, the conclusion was that the model of the reliability of wheat harvesters produced nowadays is the exponential function. In the process of exploitation, the damages had the saltatory character not dependent on the using process. The basic cause of the damage were the operator's errors and the hard conditions of exploitation (69%). When it comes to the harvesters researched at the earlier time, the reliability is best described by logarithmic and Weibull's functions. It shows that they have more complex damage causes which were usually due to the overuse of parts.

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“…They are characterized by a greater passivation potential in physiological solutions. Mechanical properties and corrosion resistance is determined by the chemical composition and structure depending on the type of technology and manufacturing conditions [1,2]. In this respect, cobalt alloys can be divided into casting and wrought alloys.…”

Section: Introductionmentioning

confidence: 99%

Changes in the Structure and Physical Properties of Heat-Treated Cobalt-Based Biomaterial

Błaszczak¹

2017

Intelligent Computing and Information Engineering (ICIE)

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The paper describes cast cobalt alloy after thermal processing -recrystallizing annealing in 1173 ÷ 1473 K temperature range. The aim of processing was to decrease the percentage of the dendritic structure and obtain crystalline structure. The foundations of thermal processing considered the diffusion phenomenon, its parameters were determined analytically. Further, the detailed parameters of processing, results of microstructural analysis, as well as phase diffractometry, full microanalysis of chemical composition and hardness measurements are presented. INTRODUCTIONCobalt-based alloys are a group of metallic materials suitable for products for reconstructive surgery. They are characterized by a greater passivation potential in physiological solutions. Mechanical properties and corrosion resistance is determined by the chemical composition and structure depending on the type of technology and manufacturing conditions [1,2]. In this respect, cobalt alloys can be divided into casting and wrought alloys.The main alloying elements include chromium, the concentration of which varies within 18 ÷ 30%, molybdenum in the range from 2.5 to 9%, and nickel with concentration in the range of 15 to 35%. Wrought alloys also have tungsten in an amount of 3 ÷ 8.8%. Cobalt also include coal whose maximum concentration is in the range of 0.05 ÷ 0.35%.The basic element which undergoes segregation is chromium, the concentration of which varies in the range 19 ÷ 35%. Molybdenum is segregated to a lesser extent with concentration changing within the range of 4 to 6%.The most commonly used cobalt alloy is Vitalism type Co-Cr-Mo casting alloy. The matrix of the Co-Cr-Mo cast alloy is made of crystallites of the solid solution of chromium, molybdenum and carbon in β-Co with A1 network. Within crystallites, there are strong dendritic micro segregation and in the interdendritic areas and along the crystallite borders there are primary separations of a continuous nature. The heat treatment of cast alloys is used to improve the mechanical and fatigue properties; the results strongly depend on the modification of the chemical composition and metallurgical quality of the casting [3].The alloys of this type do not include iron or tungsten, the stabilizing additive is niobium. Excluding the iron from the alloy composition increases resistance to corrosion. Another factor that increases resistance, especially to pitting and intergranular corrosion, is lower carbon content, which in the presence of carbide forming alloying elements causes the formation of unfavourable M23C6 carbides in the alloys [3,4]. The allotropic transformation α -Co <=> β -Co is the most important from the point of view of biomaterials.Changing the structure from A1 (β -Co) to A3 (α -Co) can be made by forming a stacking fault on every other plane {111} in A1 network [4,5]. As a result, the sequence of the planes changes from ABCABC the ABAB planes (0001). Such a sequence alteration may be formed by the movement of Shockley partial dislocation with Burgers vector 21...

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Analysing the reliability of working parts operating in abrasive soil pulp taking into consideration confounding factors

Abstract: MikołAjczAk P, NAPiórkowski j. Analysing the reliability of working parts operating in abrasive soil pulp taking into consideration confounding factors. Eksploatacja i Niezawodnosc -Maintenance and reliability 2016; 18 (4): 544-551, http://dx

Cited by 18 publications

References 6 publications

Technical Aspects of Relocation of Production and Assembly Lines in Automotive Industry

Technical Aspects of Relocation of Production and Assembly Lines in Automotive Industry

Models of Reliability of Multi-Purpose Machines in a Historical Perspective

Changes in the Structure and Physical Properties of Heat-Treated Cobalt-Based Biomaterial

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