Controlling the properties of polycarbonate during processing with the object of extending the service life of machine parts

1972 ◽  
Vol 5 (3) ◽  
pp. 333-342
Author(s):  
M. S. Akutin ◽  
L. N. Magazinova
Keyword(s):  
Service Life ◽  
Machine Parts

scholarly journals Influence of overlay layers on the abrasive wear

2012 ◽  
Vol 52 (No. 3) ◽  
pp. 115-122 ◽  
Author(s):  
P. Hrabě ◽  
R. Chotěborský ◽  
R. Medlín
Keyword(s):  
Chemical Composition ◽  
Service Life ◽  
Abrasive Wear ◽  
Friction And Wear ◽  
Significant Part ◽  
Alloying Elements ◽  
Manufacturing Processes ◽  
Operating Reliability ◽  
Machine Parts

A problem of machine parts wear decrease and in this way of the economical effectiveness of rapid wearable parts interferes with majority of manufacturing processes. Service life and operating reliability of a great number of machine parts is largely influenced by friction and wear, which take a significant part in the power and material losses. Wear affects significantly the maintenance, repair and renewal costs of machine parts, too. Today we can use a row of overlay materials. They differ above all by chemical composition, which determinates the conditions of use. Next conditions are the solidification of the welded-on material and the diffusion ability of main alloying elements, which determine the resultant structure of an overlay. The paper intents on multilayer overlays problem and on the number of overlay layers influence on abrasive wear.

Advantages and Properties of Laser-Hardened Surfaces

2020 ◽  
Vol 403 ◽  
pp. 91-96
Author(s):  
Stanislav Němeček
Keyword(s):  
Cyclic Loading ◽  
Service Life ◽  
Residual Stresses ◽  
Process Parameters ◽  
Fatigue Behavior ◽  
Influence Of Process Parameters ◽  
Machine Parts ◽  
And Behavior

The paper summarizes the findings of a study of properties and behavior of laser hardened surfaces. The influence of hardening on the service life and tribological resistance of molds and other machine parts will be presented. Furthermore, the influence of process parameters on residual stresses, their direction and magnitude, and related deformation, fatigue behavior under cyclic loading, etc. are described.

How to determine the remaining life of machine parts

2020 ◽  
pp. 50-57
Author(s):  
Vyacheslav I. Chernoivanov ◽  
Vyacheslav A. Denisov ◽  
Aleksey A. Solomashkin
Keyword(s):  
Service Life ◽  
Residual Life ◽  
Interval Estimation ◽  
Probability Of Failure ◽  
Technical Condition ◽  
Research Purpose ◽  
Interval Estimate ◽  
Remaining Life ◽  
Maintenance And Repair ◽  
Machine Parts

The article presents three strategies for maintenance and repair of machines that control the pre-selected and justified parameters of the technical condition of the machine, as well as the costs of eliminating failures for these strategies and the possibility of reducing them. (Research purpose) The research purpose is to identify the most effective way to determine the residual life of machine parts. (Materials and methods) The article proposes a strategy for maintenance and repair of machines, in which a special place is occupied by ways of reducing the mechanical friction losses, increasing the efficiency of the machine and the service life of its parts. The article notes that in order to meet the service life, it is necessary to monitor their remaining life visually or using appropriate sensors. In order to determine the remaining resource in more accurately way, we suggested that it would be measured several times, preferably using different methods or devices. Authors designed a computer program that allows to estimate the remaining resource using an interval estimation of random values for a given probability of failure-free operation of the machine part. The plunger pairs of a high-pressure fuel pump were chosen as the object of research. As a diagnostic parameter that characterizes the technical condition of the pump, its starting cycle feed was used, the value of which was determined on different stands. (Results and discussion) Article presents the values of the average resources of the plunger pairs, their dispersion around the corresponding average values, and calculated their average residual resource as an interval estimate for a given probability of failure-free operation. (Conclusions) The research results have shown a possibility of using the residual resource as the basis of the proposed strategy for maintenance and repair of machines based on minimizing the residual resource of their parts. The most important unsolved task for this strategy remains the selection and justification of primary diagnostic sensors for assessing the residual life of machine parts.

Statistical Modeling for Assessment of Dipper Stick Service Life

2018 ◽  
Vol 931 ◽  
pp. 417-421 ◽  
Author(s):  
Tatyana M. Rogovenko ◽  
Marina M. Zaitseva
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
General Population ◽  
Service Life ◽  
Bearing Capacity ◽  
Cross Section ◽  
Statistical Simulation ◽  
Small Samples ◽  
Source Data ◽  
Machine Parts

This paper presents an evaluation of the minimum dipper stick service life in the unsafe cross-section; it is based on statistical simulation known as Monte Carlo method. Source data on the bearing capacity parameters as well as on the values of stresses in the unsafe cross-section are presented as small samples. Statistical simulation is used to create a finite general population of data on machine parts my means of an intermediate subpopulation using order statistics distributions.

scholarly journals Influence Of Laser Hardening By Round, Profiled And Oscillating Beam On The Increase Of Service Life Of Machine Parts

2017 ◽  
Vol 63 (3) ◽  
pp. 28-34 ◽  
Author(s):  
V.P. Biriukov ◽  
A.A. Fishkov ◽  
D.Yu. Tatarkin ◽  
E.V. Hriptovich
Keyword(s):  
Service Life ◽  
Laser Hardening ◽  
Machine Parts
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