scholarly journals Thermal Factors of Die Casting and Their Impact on the Service Life of Moulds and the Quality of Castings

2013 ◽  
Vol 10 (03) ◽  
Keyword(s):  
Service Life ◽  
Die Casting

Operation and maintenance of Impressed Current Cathodic Protection systems on concrete civil structures

2018 ◽  
Author(s):  
Jacob Brink Jansson ◽  
Ruth Sørensen ◽  
Kirsten Riis
Keyword(s):  
Service Life ◽  
Cathodic Protection ◽  
Protection System ◽  
Civil Structures ◽  
Correct Operation ◽  
Operation And Maintenance ◽  
Number Of Factors ◽  
Protection Systems ◽  
Cathodic Protection System

Cathodic protection is a very well-known method of preventing or stopping reinforcement corrosion and thereby extending the service life of reinforced concrete civil structures. However, a number of factors, which among others are design, materials and components, installation methods, quality of workmanship, and operation and maintenance of the cathodic protection system, have influence on the functionality and effectivity of the cathodic protection system. The optimum design that fulfils the Client''s requirements to cost, traffic disruption, service life, etc. shall be determined in accordance with the structure layout and the ability of the Client''s organisation to conduct operation and maintenance. It is critical to ensure that all components are installed properly to achieve the expected service life of the system. Regular and correct operation and maintenance is also crucial to ensure the functionality and effectivity system.

Dynamics of Treatment Device for Die Casting of Metals

2015 ◽  
Vol 669 ◽  
pp. 327-334 ◽  
Author(s):  
Juraj Ružbarský ◽  
Rastislav Majerník ◽  
Petr Hrabě ◽  
Petr Valášek
Keyword(s):  
Die Casting ◽  
Working Environment ◽  
Regulation System ◽  
Work Culture ◽  
Input Quantity ◽  
Treatment Equipment ◽  
Casting Cycle ◽  
Grease Flow ◽  
Output Quantity

The aforementioned proves that the grease flow in mould treatment equipment can be regarded as a regulation system with the input quantity by medium pressure p1 above the grease level and with the output quantity by the grease flow speed.The utilization of treatment equipment for die casting of metal enhances both the working environment and work culture during die casting of metals. Application of grease flow regulation results in better repeatability of die casting cycle which positively influences the quality of castings.

scholarly journals Investigation of dynamics of roll forming processes

2018 ◽  
Vol 224 ◽  
pp. 01134 ◽  
Author(s):  
Leonid A. Kondratenko ◽  
Lubov I. Mironova
Keyword(s):  
Heat Exchange ◽  
Service Life ◽  
Dynamic Process ◽  
Theoretical Aspect ◽  
Complex Interaction ◽  
Roll Forming ◽  
Structural Elements ◽  
Velocity Fluctuations

This article contains the analysis of tube expander dynamics in complex interaction of structural elements of heat-exchange tubes attachment assembly in the process of roll-forming operation, description of dynamic process theoretical aspect. It is shown that torque variations lead to velocity fluctuations and influence the service life of operative parts of tube expander and quality of tube attachment assemblies.

The Experimental and Numerical Analysis of Stress as a Tool for Optimizing the Selected Structural Components of an Injection Device

2015 ◽  
Vol 816 ◽  
pp. 482-489
Author(s):  
Peter Sivák ◽  
Oskar Ostertag
Keyword(s):  
Numerical Analysis ◽  
Service Life ◽  
Structural Components ◽  
Injection Device ◽  
Paper Briefly ◽  
Technical Parameters ◽  
Structural Parts ◽  
The Individual ◽  
Important Basis

The improvement of the main monitored technical parameters of the production devices is connected with the optimization of the individual structural components and construction nodes of these devices. Mainly those critical structural nodes of the devices that have a significant impact on the quality of the products manufactured by this device and its service life are studied. This paper briefly presents the results of experimental and numerical analysis of stresses and strains of selected structural components of the injection device, such as the connecting and guiding columns and the adjustable push plate. The relevant analyses of stresses and strains have been connected with the performance of a series of experimental and computer simulations. The results of these simulations then became an important basis for further optimization of selected structural parts of the injection device.

scholarly journals Study on Vibration Tapping for SiCp/Al Particle-reinforced Metal Matrix Composite

2018 ◽  
Vol 228 ◽  
pp. 04005
Author(s):  
Yang Liu ◽  
Jing Zhao
Keyword(s):  
Service Life ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Torsional Vibration ◽  
Metal Matrix ◽  
Low Frequency ◽  
Cutting Fluid

Aiming at answering the question that low tap service life of ordinary tapping and bad thread quality on particle-reinforced metal matrix composite SiCp/Al, the reason of question and the mechanism of low-frequency torsional vibration tapping are analyzed. The experiments were carried out to compare the tap service life and the thread quality of vibration tapping with ordinary tapping without cutting fluid. It indicates that vibration tapping could make tapping torque reduce greatly, the tap service life could be prolonged twice comparing with continuous tapping without cutting fluid, and could ensure the good thread quality. Moreover, it promotes metal matrix composite’s further application.

Analysis of Influence of Pressing Speed, of Melt Temperature and of Casting Position in a Mold upon Ultimate Tensile Strength Rm of Die Casting from Aluminium

2014 ◽  
Vol 909 ◽  
pp. 3-7 ◽  
Author(s):  
Stefan Gaspar ◽  
Ján Pasko
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Production Efficiency ◽  
Die Casting ◽  
Economic Indicators ◽  
Melt Temperature

The paper deals with analysis of influence of pressing speed, of melt temperature and of casting position in a mold upon ultimate tensile strength Rm of die casting from aluminium. The monitored parameters of die casting are very important in terms of production efficiency and quality of casting, which is positively reflected in economic indicators of the production.

Influence of SBS Dosage on the Performance of Modified Asphalt

2014 ◽  
Vol 505-506 ◽  
pp. 255-259
Author(s):  
Chang Yong Ye ◽  
Wan Yi Yang ◽  
Xi Zhang ◽  
Wei Guang Li
Keyword(s):  
Molecular Weight ◽  
Service Life ◽  
Softening Point ◽  
Production Quality ◽  
Construction Quality ◽  
Modified Asphalt ◽  
Modification Effect ◽  
Sbs Modified Asphalt

In this paper, two base asphalt types representing two oil sources and two modifiers (linear and star-shaped) are processed. This paper discusses the relation between dosage of SBS and the characteristics of SBS modified asphalt. Modified effects related to the structure and molecular weight of SBS. The modification effect of star-shaped modifier is better but the processing performance of linear modifier is better. The index of evaluating the production quality of SBS modified asphalt is proposed and the basis of controlling the construction quality of SBS modified asphalt is provided. Through the analyses of modified asphalt with different variety and different SBS dosage in conventional experiments such as penetration, ductility, softening point and the relation between the dosage of SBS and various technical performances of SBS modified asphalt is obtained. After the modified, penetration is decreased and softening point and ductility is increased, which prolonged the service life of pavement.

Quality Control System for Die Castings Based on Statistic Analysis

2012 ◽  
Vol 246-247 ◽  
pp. 918-923
Author(s):  
Xiao Fang Ruan
Keyword(s):  
Quality Control ◽  
Control System ◽  
Statistical Analysis ◽  
Die Casting ◽  
Ferrous Metal ◽  
Casting Machine ◽  
Casting Process ◽  
Quality Control System ◽  
Die Castings

Die casting technology is applied widely for mass production of non-ferrous metal parts. How to guarantee the quality of die castings is always a concerned topic. A quality control system for die casting machine was developed based on statistical analysis of technology parameters. Firstly the original data is acquired from die casting machine and the technology curves are displayed. Secondly, the technology parameters are identified automatically and a database of technology parameters is established. Thirdly, a statistical analysis based on the database is performed. The statistics parameters of expecta -tion and deviation are figured out and the probability distribution diagrams for technology parameters are displayed. Finally, Tolerances for technology parameters are figured out and then the system will monitor the die casting process according to the tolerances. A practical system realization in a die casting machine is demonstrated by its monitoring interfaces. Statistical information and on-line monitoring provided by this system are helpful to guarantee the quality of die castings.

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