<abstract xmlns="http://www.w3.org/1999/xhtml">

To comply with latest standards regarding emission regulations, diesel technology focuses on how to obtain a very good spray quality, by identifying the appropriate geometry for injector nozzles, the optimum size of injection holes and the best hydraulic parameters for efficient fuel spray evolution and dispersion. In practice, injectors are often subject to operating problems, mainly because inside the diesel fuel injector nozzle, accumulation of deposits might occur. To control the phenomenon, the scientific literature proposes anti-corrosion treatment. The present paper studies the effect of applying anti-corrosion treatment to a new diesel injector. The investigation method consists in using a Scanning Electron Microscope next to EDX Spectrometry. The results indicate that chemical treatment can lead to new deposits that also contaminate the nozzles. Concluding, the anticorrosion treatment must include monitoring and control of the process and as a final step, a method to remove detergent deposits.
</abstract>

Effect of Anti-Corrosion Treatment Applied to Diesel Injector Nozzles

<abstract xmlns="http://www.w3.org/1999/xhtml">

In the rigid body kinematics, the position of the mobile frame in relation to the fixed frame is given by the base-change matrix. The elements of this orthogonal matrix are given by the Euler’s angles. This paper establishes the reverse link relations between the Euler’s angles and the elements of the base-change matrix (directional cosines).
</abstract>

Expressions of Euler Angles as Functions of the Directional Cosines of Three-Orthogonal Axes in Rigid Body Kinematics - II

<abstract xmlns="http://www.w3.org/1999/xhtml">

Situations encountered in “reverse engineering” are relatively common in which, to address a problem of profiling generating tools for processing an orderly curl of surfaces (cylindrical or helical teeth), data known by measuring the existing product are used. The surface numerical representation can be done in the form of a points cloud. The profiling algorithm proposed in the paper is based on the possibility of measuring surfaces and their representation through an ordered cloud of points. The algorithm uses the complementary theorem of the virtual pole, for profiling the rack tool generating a piece that has an ordered curl of profiles. The methodology is not limited to the profiling of the rack tool but can be extended to the problem of profiling the primary peripheral surface of some screw-type tools, generating the ordered curl of surfaces. The paper also presents a numerical application developed based on a specific software product.
</abstract>

Profiling of the Generating Rack of an Ordered Curl Known in Discrete Form by the Virtual Pole Method

<abstract xmlns="http://www.w3.org/1999/xhtml">

The bond-graph method is used for finding the equations which describe the systems dynamics, by analysing the way of power transmission from the source to the working elements. When the energy storage elements I and C are in integral causality, the number of state equations equals the number of these elements. If there are also energy storage elements in derivative causality, the system contains a number of differential equations equal to the number of energy storage elements in integral causality and a number of algebraic equations equal to the number of energy storage elements in derivative causality. The work presents a new method for finding the system of differential equations for mechanical systems with one degree of freedom, starting from the original system which contains both algebraic and differential equations.
</abstract>

“Gheorghe Asachi “Technical University of Iași

A Method to Find the Differential Equations from the Bond Graph Containing Inertial Elements in Derivative Causality

<abstract xmlns="http://www.w3.org/1999/xhtml">

This article tries to help the small mechanical companies with a proposed solution of a cost structure.
The decomposition of all the activities that constitute the global cost, can constitute an advantage in front of the competition.
In today’s economy, any information on real time regarding the spending of a small company could make the difference between bankruptcy and profitability.
</abstract>

Cost Structure for a Small Mechanical Company

<abstract xmlns="http://www.w3.org/1999/xhtml">

Being known the lack of information about constants that appear in the Kienzle relationship, this work proposes a solution to reduce the effort required to customize their values.
Applied to face milling, the proposed procedure makes it possible to identify the coefficients in the case of turning, using experiments under certain conditions of similarity, which are then used to calculate the principal cutting force in the case of milling.
The proposed procedure uses a stationary dynamometer both to measure the cutting force in the case of turning and to calculate the tangential force in the case of face milling.
The experiments carried out have tried to simulate a real processing case for industry, the worpiece material being used as supplied by the supplier.
</abstract>

An Empirical Estimation of Cutting Force for Face Milling Using a Stationary Dynamometer

<abstract xmlns="http://www.w3.org/1999/xhtml">

The paper describes a theoretical research approach that performs a dynamic study upon a complex gear transmission. The transmission errors of the gears from the considered complex gear drive are considered when kinematics is analyzed and presented. The cutting forces from a gear hobbing process, possibly driven by such a complex gear transmission, are considered when parameters of the dynamic model are mathematically evaluated and presented. The proposed model development includes the obtaining of the differential equation for kinetic energy. Some discussions are also made regarding the studied complex mechanism. Practically, mathematical models for the influence of transmission errors and hobbing forces upon the considered complex gear drive are proposed as deliverable results of the study. Final conclusions are also included in the paper. The aspects discussed in the paper are presenting utility for the design of such mechanisms or for calculating the parameters of some gear hobbing processes.
</abstract>

“Gheorghe Asachi” Technical University of Iași

Faculty of Mechanical Engineering, Department of Mechanical Engineering, Mechatronics and Robotics

Faculty of Machine Manufacturing and Industrial Management, Department of Machine Manufacturing Technology

Models for the Influence of Transmission Errors and Hobbing Forces Upon a Complex Gear Drive

<abstract xmlns="http://www.w3.org/1999/xhtml">

The use of electromechanical devices in many areas has led to the need to solve problems related to their proper functioning and the possibility that some external factors may affect their operation. The purpose of the developed research was to design and materialize a solution to test the operation of the computer hard disk as an electromechanical device. The systemic analysis method was used to highlight the factors capable of influencing the operation of a computer’s hard disk. The components of a hard disk performance testing equipment were identified to evaluate the operation of the hard disk at the variation of some input factors. An enclosure solution was subsequently established and implemented using the idea diagram method to evaluate the functioning of the hard disk when changing the values of some input factors capable of affecting the intensity of the process of losing the functional qualities of the hard disk.
</abstract>

Enclosure for Testing the Electromechanical Devices When Changing the External Conditions

<abstract xmlns="http://www.w3.org/1999/xhtml">

Electrochemical machining relies on the electrolysis phenomenon, this being characterized by the chemical reaction between the workpiece material and an electrolyte solution. Both the electrode and the workpiece materials are connected into an electric circuit, charged by a direct current electric energy source. The workpiece is used to get some complex forms of cavities into parts of electrically conductive materials or other hard conductive materials, which could not be processed efficiently by the other means. This paper presents the results of some research related to the development of an equipment concept that could highlight the variation of some output parameters of the process in function of the value of the input factors in the process. It has opted to create a device for studying electrochemical erosion, where different substances, with a direct current source with variable adjustment. Taking into account the experimental results when using different materials for the workpiece, different materials for the tool electrode, many working electrolyte type substances, and changing the values of the electrical parameters, results necessary for a relevant conclusion could be obtained.
</abstract>

Initial Considerations in the Study of the Manufacturing Process by Electrochemical Machining

AHEAD OF PRINT

Volume 69 (2023): Issue 4 (December 2023)

Volume 69 (2023): Issue 3 (September 2023)

Volume 69 (2023): Issue 2 (June 2023)

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Volume 68 (2022): Issue 4 (December 2022)

Volume 68 (2022): Issue 3 (September 2022)

Volume 68 (2022): Issue 2 (June 2022)

Volume 68 (2022): Issue 1 (March 2022)

Volume 67 (2021): Issue 4 (December 2021)

Volume 67 (2021): Issue 3 (September 2021)

Volume 67 (2021): Issue 2 (June 2021)

Volume 67 (2021): Issue 1 (March 2021)

Bulletin of the Polytechnic Institute of Iași. Machine constructions Section

 Machine Construction section, as part of the Bulletin of the Polytechnic Institute of Iasi founded in 1946, appears as an autonomous publication since 1950. Currently, it is issued in both printed and electronic format, on a quarterly basis, and is included in a library exchange program with 84 other publications. The Machine Construction section is a technical scientific journal which publishes original research papers, as well as occasional reviews of treaties, lectures and monographs in various fields of Mechanical Engineering. Main topics include: theoretical and applied machine mechanics; fluid mechanics and hydro-pneumatic machines; robotics; tribology; machine manufacturing; machining technologies; industrial management; economical engineering in mechanics; machine design; mechatronics; theoretical and experimental study of strain and stress; micromechanical systems; materials machinability and surface finishing technologies; machine tools; automotive; internal combustion engines; steam and gas turbo-engines; refrigeration machines and heat pumps; renewable energy sources; heat transfer; cogeneration and tri-generation systems; applied thermodynamics and thermal systems; combustion; agricultural mechanics and machinery; technologies and equipment for food processing and food industry; bioengineering and biofuels; traffic and safety etc. At this time, there is no publication fee and full-text papers are available open-access on the university website. The review process of each submitted paper includes an anti-plagiarism test with specialized software and a double-blind independent review. The authors are notified at each stage of the process. The rejection rate is above 50%. The main publication language is English.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 