scholarly journals Linear Displacement Calibration System Integrated with a Novel Auto-Alignment Module for Optical Axes

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2462 ◽  
Author(s):  
Yi-Chieh Shih ◽  
Pi-Cheng Tung ◽  
Yung-Cheng Wang ◽  
Lih-Horng Shyu ◽  
Eberhard Manske
Keyword(s):  
Machine Tools ◽  
Mechanical Engineering ◽  
Critical Issue ◽  
Linear Displacement ◽  
Engineering Industry ◽  
Operational Experience ◽  
Common Path ◽  
Fabry Perot ◽  
Optical Axes

The quality of processed workpieces is affected directly by the precision of the linear stage. Therefore, the linear displacement calibration of machine tools must be implemented before delivery and after employment for a period of time. How to perform a precise calibration with high inspection efficiency is a critical issue in the precision mechanical engineering industry. In this study, the self-developed system integrated by the measurement module based on the common path Fabry–Pérot interferometer for linear displacement and the auto-alignment module for optical axes was proposed to realize the automatic linear displacement calibration of the linear stages. The measurement performance of the developed structure was verified experimentally. With the auto-alignment module, the cosine error was reduced to 0.36 nm and the entire procedure accomplished within 75 s without the limitation of the perceived resolution of the human eye, operational experience, and the risk of misalignment and broken cable. According to the comparison of experimental results for the linear displacement, the repeatability of the proposed measurement module was less than 0.171 μm. After the compensation procedure according to the linear displacement calibration, the systematic positional deviation, repeatability, and accuracy of the linear axis could be improved to 4 μm, 1 μm, and 5 μm respectively. Hence, the calibration efficiency can be improved by 80% with the proposed compact system, which is beneficial for the linear displacement calibration of machine tools in the precision mechanical engineering industry.

scholarly journals The role of health tourism in reducing the number of occupational diseases and accidents in the mechanical engineering and metalworking sectors in Latvia

2019 ◽  
Vol 297 ◽  
pp. 07007
Author(s):  
Jelena Lukjanova
Keyword(s):  
Occupational Diseases ◽  
Mechanical Engineering ◽  
Manufacturing Industry ◽  
Engineering Industry ◽  
Health Tourism ◽  
Demographic Situation ◽  
Existing Problems ◽  
Metalworking Industry

In order to ensure successful innovative development of Latvian mechanical engineering and metalworking industry, quality of human resources is one of the important task. First of all, it is necessary to name health of people working in the industry. In Latvia a number of occupational diseases increased, with the greatest growth taking place in manufacturing industry, integral part of which is the engineering and metalworking industry. The problem of accidents at work is also urgent, the number of diseases caused by growing stress. Taking into consideration difficult demographic situation in Latvia and the existing problems in labor market, this situation requires special attention. In the article, the author substantiates the importance and prospects of the development of health tourism as an important factor in maintaining the health and working ability of workers in engineering industry.

The Italian Heavy Mechanical Engineering Industry

1969 ◽  
Vol 184 (1) ◽  
pp. 1146-1155
Author(s):  
Pier Giovanni Gamucci
Keyword(s):  
Machine Tools ◽  
Technological Progress ◽  
Mechanical Engineering ◽  
Thermal Power ◽  
Industrial Applications ◽  
Engineering Industry ◽  
Significant Progress ◽  
History Of ◽  
Generating Equipment ◽  
Power Generating Equipment

This paper is divided into two parts. The first deals with the Italian heavy mechanical engineering industry in general. It contains a brief history of the industry from the nineteenth century to the present day and then considers three important factors at present affecting the industry: technological progress; the growth of labour-training facilities as the number of men employed increases; the increase in size of companies. The second part deals in some detail with the following sectors of the industry: power-generating machines; thermal power-generating equipment for industrial applications; machine tools; pumps and compressors; lifting and handling equipment. In all these sectors significant progress has been made.

scholarly journals Analysis of Features of Functioning and Assessment of Development of Mechanical Engineering Enterprises of the Irkutsk Region

2021 ◽  
Vol 21 (3) ◽  
pp. 89-106
Author(s):  
O. Yu. Roy
Keyword(s):  
Mechanical Engineering ◽  
Machine Building ◽  
Engineering Industry ◽  
Industrial Enterprises ◽  
Irkutsk Region ◽  
Key Sectors ◽  
Analysis And Synthesis ◽  
Expert Assessments ◽  
Development Prospects

The disparity between the contribution of the mechanical engineering industry to the formation and development of the national economy and its potential determines the need to study the specifics of the activity and develop a set of measures aimed at a breakthrough, the basis of which should be the modernization of the complex and, aimed at sustainable development, the improvement of management. Mechanical engineering enterprises in the Irkutsk region form one of the key sectors of the economy. The degree of their development directly affects the stable functioning of such industries as logging, woodworking, energy, petrochemicals, metallurgy, as well as the quality of life of the region's population. The article presents a research and assessment of the state, features, and trends in the development of enterprises of the national mechanical engineering complex located in Irkutsk region. The problems and factors hindering the development of regional mechanical engineering production are identified. The article presents the justified directions of its development prospects obtained using the monographic method, the method of expert assessments, analysis and synthesis. Possible ways to improve the efficiency of industrial enterprises are proposed. These studies can serve as a basis for developing a rational industrial policy in relation to the mechanical engineering industry of the Irkutsk region and improving the efficiency of the mechanical engineering complex. A purposeful policy for the development of the machine-building industry will make it possible to create conditions for solving issues of strategic innovative development.

The concept of customization of scientific and pedagogical activities in sector-specific mechanical engineering universities

2021 ◽  
pp. 81-88
Author(s):  
V.V. Glushchenko
Keyword(s):  
Mechanical Engineering ◽  
Scientific Activity ◽  
Engineering Industry ◽  
Quality Of Education ◽  
Educational Activities

The concept of customization of scientific and pedagogical activities in mechanical engineering universities, taking into account their industry features, to improve the quality of education by integrating of scientific and educational activities into the practice of mechanical engineering enterprises is proposed. Keywords: mechanical engineering, industry, customization, education, scientific activity, practice, integration. [email protected]

Mechanical Engineering in the Midlands, 1925–1950

1950 ◽  
Vol 162 (1) ◽  
pp. 279-290
Author(s):  
F. Vincent Everard
Keyword(s):  
Special Reference ◽  
Gas Turbines ◽  
Machine Tools ◽  
Mechanical Engineering ◽  
Road Transport ◽  
Engineering Industry ◽  
Steam Turbines ◽  
Public And Private ◽  
Steam Boilers ◽  
Made In

Developments of popular interest that have taken place in the mechanical engineering industry in Birmingham and the surrounding districts by the year 1950, which is not only twenty-three years since the Institution last met there but also is the turn of the half century, are briefly surveyed. Power plant, incorporating steam boilers, steam turbines, oil engines, and gas turbines, is discussed, with special reference to the development of the oil engine and its adaptation for special usage in the 1939–45 war. Changes in public and private road transport engines are traced up to the first turbine-engined private motor car. Improvements in the design of machine tools from practical and aesthetic aspects are touched upon. Mass production and its effect on the craftsman, and advances that have been made in factory management, amenities, and the prevention and treatment of accidents are mentioned, as also is the rehabilitation of workmen, with special reference to the work carried on by the Birmingham Accident Hospital. In processes, the hydroblast method of cleaning castings and the automatic rustproofing of car bodies are described.

Dynamics of the processes in metal machining

1998 ◽  
Vol 2 ◽  
pp. 115-122
Author(s):  
Donatas Švitra ◽  
Jolanta Janutėnienė
Keyword(s):  
High Frequency ◽  
Machine Tools ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Frequency ◽  
Metal Cutting Machine ◽  
Cutting Machine ◽  
Metal Machining

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion. The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.

Patient satisfaction and comfort after a full-arch immediate loaded prosthesis

2020 ◽  
Author(s):  
Elena Dellepiane ◽  
Francesco Pera ◽  
Paola Zunino ◽  
Maria Grazia Mugno ◽  
Paolo Pesce ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Oral Health ◽  
Intermediate Phase ◽  
Critical Issue ◽  
Health Impact ◽  
Immediate Loading ◽  
Oral Rehabilitation ◽  
Masticatory Ability ◽  
Chewing Ability

The aim of this study was to assess oral health related quality of life (OHRQoL) of patients before, during and after completion of implant-supported full-arch immediate loading rehabilitation according to the Columbus Bridge Protocol (CBP). 25 patients with compromised dentition were rehabilitated according to the CBP and were assessed for OHRQoL using 4 questionnaires specifically realized for this study and inspired to the OHIP (Oral Health Impact Profile) questionnaire. Patients assessed themselves before surgery, during the healing period (1 week and 2 months after surgery) and after definitive prosthodontic treatment (4 months after surgery). The questionnaires specifically investigated patients’ pain, confort, home oral hygiene habits, satisfaction related to esthetics, masticatory ability, phonetics and general satisfaction toward the treatment.Patients reported an improvement of OHRQoL after full-arch immediate loading rehabilitation. A statistically significant improvement in aesthetic and chewing ability was found. After 4 months 92% of the patients did not feel tense with their smile, 96% did not show problems to relate with other people or smiling, 92% did not show difficulty to eat some foods. Phonetics was found to be a critical issue, especially in the intermediate phase of healing. One week after surgery the percentage of patients who was very satisfied with phonetics slightly decreased from 48% to 36%. The assessment of patients' OHRQoL related to full-arch immediate loading implant therapy exhibited a significant improvement of their quality of life. The questionnaires herein presented could be an effective tool to evaluate patients' reaction to oral rehabilitation.

scholarly journals Hardened Steels and Their Machining

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 182
Author(s):  
Karel Osička ◽  
Josef Chladil
Keyword(s):  
Cubic Boron Nitride ◽  
Tool Material ◽  
Hardened Steel ◽  
Engineering Industry ◽  
Technical Equipment ◽  
Correct Operation ◽  
Assembly Unit ◽  
The Subject ◽  
Bearing Rings

This article discusses the issue of hardened steel machining. Many components in the engineering industry use hardening as the final heat treatment. These components usually occupy a significant position in a given assembly unit. They guarantee the correct operation of the entire technical equipment in total cooperation with other components. The quality of these components depends on the integrity of their surface. The production of these parts is usually carried out by traditional technological procedures. Clearly, an example of such a technology is grinding. However, this article discusses the application of other finishing technologies using a tool material made of cubic boron nitride (CBN). The technology used is finishing turning with subsequent tumbling technology. The subject of the evaluation is the integrity of the surface. In this part of the experiments, there are mainly individual parameters of surface roughness. Compared components are bearing rings, in this case the inner surface of the housing ring.

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