Production of blanks and parts of machines from polymeric material "Rimamid"

2020 ◽  
pp. 475-479
Author(s):  
A.V. Shaparev ◽  
I.A. Savin ◽  
R.V. Gavariev
Keyword(s):  
Polymeric Material ◽  
Mechanical Engineering ◽  
Rolling Bearings ◽  
Advantages And Disadvantages ◽  
Machine Parts

The production of blanks and the use of material "Rimamid" for the manufacture of sliding and rolling bearings, bushings for wheels and rollers, pulleys, blocks, brackets, wheel hubs, gears, sprockets, gears and worm wheels and other parts to reduce weight, noise and vibrations is considered. The characteristics of the material, examples of the blanks manufacture, the advantages and disadvantages of the material "Rimamid" for the manufacture of machine parts, prospects for use in mechanical engineering are presented.

METHODS FOR RESTORING WOLVES OF ROLLING PRODUCTION

2020 ◽  
Vol 4 (141) ◽  
pp. 114-122
Author(s):  
DAR’YA LEBEDEVA ◽  
◽  
ANNA KARPUNICHEVA
Keyword(s):  
Thermal Effects ◽  
Machine Building ◽  
Research Purpose ◽  
Technical Literature ◽  
Production Methods ◽  
Advantages And Disadvantages ◽  
Rolling Production ◽  
Machine Parts ◽  
The Stability ◽  
High Degree

Large forces and significant thermal effects are created on the rolls when rolling sheets. The higher the stability of the rolls, the less downtime during their rerolling and higher productivity. (Research purpose) The research purpose is in analyzing the ways of restoring rolls and choose the most appropriate method for restoring these parts. (Materials and methods) The article presents the analysis of the scientific and technical literature on the topic of rolling production, methods for restoring large-sized machine parts of machine-building and metallurgical industries that work in difficult conditions and are subject to a high degree of wear. Authors try to solve the problem by means of comparative and logical analysis based on theoretical and empirical methods of scientific research. (Results and discussion) The article presents two groups of methods for restoring rolled rolls: banding and surfacing the working layer of the roll. Authors have analyzed each method in terms of technology, equipment, and feasibility. The article presents the advantages and disadvantages of the methods under consideration. (Conclusions) The most acceptable way to restore parts with a high degree of wear is surfacing. It is most efficient to apply submerged surfacing using an additional hot additive. Such surfacing, despite some complication of the equipment design, allows to deposit the metal on the roll with low heat input and in most cases in one pass. Surfacing using an additional hot additive allows to increase the productivity of the process by up to 250 percent while reducing the penetration depth by 2-3 times and saving energy by up to 40 percent.

Application of Digital Optical Microscopy in Materials and Mechanical Engineering: Optical Porosimetry and Crack Detection

2014 ◽  
Vol 982 ◽  
pp. 68-73
Author(s):  
Kamil Ďurana ◽  
Robert Černý
Keyword(s):  
Image Processing ◽  
Optical Microscopy ◽  
Mechanical Engineering ◽  
Crack Detection ◽  
Fiber Composite ◽  
Pore Space ◽  
Thermally Induced ◽  
Standard Methods ◽  
Advantages And Disadvantages ◽  
Space Description

Optical microscopy presents an extension of standard methods for pore space description. In this paper two examples of application in materials and mechanical engineering are introduced. The porosity and pore size distribution of two types of AAC are measured. In the second example the thermally induced cracks of cement fiber composite are visually detected and mathematically described. The technology of sample preparation, measurement technique and digital image processing is described, while advantages and disadvantages are discussed.

scholarly journals A Multimodel Decision Fusion Method Based on DCNN-IDST for Fault Diagnosis of Rolling Bearing

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Weixiao Xu ◽  
Luyang Jing ◽  
Jiwen Tan ◽  
Lianchen Dou
Keyword(s):  
Neural Network ◽  
Fault Diagnosis ◽  
Rbf Neural Network ◽  
Evidence Theory ◽  
Rolling Bearing ◽  
Original Data ◽  
Decision Fusion ◽  
Fusion Method ◽  
Rolling Bearings ◽  
Advantages And Disadvantages

Each pattern recognition method has its advantages and disadvantages to diagnose the state of rotating machinery. There are many fault types of rolling bearings with apparent uncertainty. The optimal fusion level is usually challenging to be selected for a specific fault diagnosis task, and extensive human labour and prior knowledge are also highly required during these selections. To solve the above problems, a multimodel decision fusion method based on Deep Convolutional Neural Network and Improved Dempster-Shafer Evidence Theory (DCNN-IDST) is proposed for the inspection of rolling bearing. To solve the defect of the original evidence theory method in the fusion of high-conflict evidence, the fuzzy consistency matrix is introduced. By calculating the factor weight, the reliability and rationality of D-S evidence theory are improved. The DCNN model can learn features from the original data and carry out adaptive feature extraction for multiple sensor information. The features extracted by DCNN adaptively are input into multiple network models for decision fusion. The new method of DCNN-IDST multimodel decision fusion is applied to detect the damage of rolling bearings. To evaluate the effectiveness of the proposed method, both the BP neural network and RBF neural network are used to set up a multigroup comparison test. The result demonstrates that the proposed method can detect the fault of the rolling bearing effectively and achieve the highest diagnosis accuracy among all the tested methods in the experiment.

Formation of Structural-Phase State in a Cobalt-Chromium-Molybdenum Alloy by Selective Laser Melting

2021 ◽  
Vol 313 ◽  
pp. 50-58
Author(s):  
A.A. Saprikin ◽  
Yurii P. Sharkeev ◽  
Natalya A. Saprykina ◽  
Margarita A. Khimich ◽  
Egor A. Ibragimov
Keyword(s):  
Low Temperature ◽  
Selective Laser Melting ◽  
Mechanical Engineering ◽  
Stable Phase ◽  
Temperature Phase ◽  
Cobalt Chromium ◽  
Laser Melting ◽  
Machine Parts ◽  
Cobalt Chromium Molybdenum ◽  
Low Temperature Phase

Heat resistant cobalt-based alloys have found a specific niche in the present-day mechanical engineering due to their unique properties. To begin with, cobalt-based alloys are used as corrosion, heat and wear resistant materials intended for aggressive environments and operation at extreme temperatures, e.g. blades, nozzles, swirlers, rings and other elements of turbines and internal combustion engines. Traditional molding methods applied in the mechanical engineering fail to provide necessary operational and technological characteristics of aforementioned machine parts. Owing to selective laser melting it is possible to reduce a production time and manufacturing costs for machine elements with a complex physical configuration and generate an alloy with an extraordinary structure, which is not found in traditionally combined compounds. A structure of cobalt exists in two crystal modifications: a hexagonal close-packed epsilon phase, a low-temperature phase and a face-centered cubic lattice gamma phase, a high-temperature phase. The alloy hardness is directly related to an amount of a low-temperature phase. The laser melting shortens a laser beam impact time on a powder composition due to a higher power and laser travelling speed. A high value of heat conductivity seems to be the reason for rapid solidification and cooling, which, in their turn, increase a percent of an alpha-martensite phase in an alloy and improve the hardness and wear resistance of machine parts. The reported paper summarizes studies aimed at the development of a stable phase structure three-component alloy (Сo-66 mass % Cr-6 mass % Mo) based on the cobalt-chromium-molybdenum system and mixed up via selective laser melting.

Learning trajectories: Comparing the transitions of graduates of “Power Mechanical Engineering” and “Humanities and Social Sciences” programs

2021 ◽  
pp. 095042222110404
Author(s):  
Su-Yen Chen ◽  
Chyuan-Yuan Wu ◽  
Hsing-Yu Chang
Keyword(s):  
Social Sciences ◽  
Mechanical Engineering ◽  
University Graduates ◽  
Societal Change ◽  
Learning Trajectories ◽  
Extrinsic Reward ◽  
Educational Design ◽  
Advantages And Disadvantages ◽  
Undergraduate Study ◽  
Humanities And Social Sciences

This study investigates and compares the learning trajectories of nine Taiwanese university graduates from a Power Mechanical Engineering (PME) program and nine from a cross-disciplinary Humanities and Social Sciences (HSS) program. Participants had received their degrees 4–7 years prior to the study. The findings suggest the relative advantages and disadvantages of different models of educational design. Even though PME graduates complained about the abstract nature of what they had learned during the first part of their undergraduate study, most had successfully entered labor markets related to the PME industry, having obtained appropriate knowledge/skills for application in industry from the latter part of the program. While some prioritized their identity as a PME professional, others admitted that they liked the extrinsic reward of a comfortable living best. In contrast, even though most of the HSS graduates admired the generic curriculum of the program, with its transferability from one context to another and its close connection to the real world, and some deeply identified with the core value of being an agent of societal change once they had entered the labor market, many also admitted that it was difficult to find a suitable industry to enter unless they first acquired a Master’s degree with higher specificity.

Camshaft Efficiency Optimization: Employing the Rolling Bearing

2012 ◽  
Author(s):  
Mohsen Bayat Pour
Keyword(s):  
Internal Combustion Engines ◽  
Manufacturing Industry ◽  
Rolling Bearing ◽  
Internal Combustion ◽  
Simulation Software ◽  
New Method ◽  
Combustion Engines ◽  
Rolling Bearings ◽  
Efficiency Optimization ◽  
Advantages And Disadvantages

This paper is intended to discuss the optimization of camshaft efficiency; using the rolling bearing instead of the sliding bearing within the internal combustion engines. The advantages and disadvantages of employing this new method will be accordingly identified and determined in-order to open new windows to the vehicle manufacturing industry. Following the mentioned goal; a camshaft is designed and tested over two types of sliding and rolling bearings in the same conditions of testing. After the comparisons being made; the achieved records have been analyzed and finally the results have been concluded and discriminated by the tables. The calculations and analyses; which are reachable within this paper, are implemented by employing both simulation software and laboratory devices.

The Accuracy of the Plastic Parts Milling Process Executed by a Six Axes Robot

2015 ◽  
Vol 808 ◽  
pp. 339-344 ◽  
Author(s):  
Alexandru Popan ◽  
Nicolae Bâlc ◽  
Bogdan Luca ◽  
Alina Popan ◽  
Alexandru Carean
Keyword(s):  
Surface Quality ◽  
New Technology ◽  
Dimensional Accuracy ◽  
Milling Process ◽  
Good Precision ◽  
Plastic Part ◽  
Advantages And Disadvantages ◽  
Machine Parts ◽  
Plastic Parts

The objective of this paper is to analyze the precision of plastic parts made by using robot milling. Currently, the robots have good precision, rigidity, flexibility and they are able to machine parts. By using a six axis Kuka robot and an electric spindle, a plastic part was milled. The paper presents the advantages and disadvantages of this new technology, analyzing the dimensional accuracy, surface quality and costs.

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