Model of surface roughness in turning of shafts of traction motors of electric carst

Purpose. Research of cutting force components during machining of high-hard cast iron by special prefabricated cutters with brazed niborite and ciborite inserts. Determination of the influence of geometric characteristics of the cutting tool, cutting modes and hardness of the material being machined on the cutting forces. The methods. The research methods were based on the fundamentals of cutting theory and cutting tools, material science properties of the tool and processed material. A research bench with special equipment was used. Findings. The nature of the change in the components of cutting forces with depth t, feed rate S and cutting speed v was experimentally investigated. The studies have shown an excess of the resulting force in the horizontal plane Pv over the circumferential one Pz, which is the main feature of turning high-hard metals. It has been established that the main limiting factors in the wear of tool cutting inserts are the permissible levels of forces. The hardness of HB has the greatest effect on the radial force Py. Under identical turning conditions for materials with a hardness of 220 to 610 HB, the forces Pz, Py and Px increase by 1,7; 3,3 and 2,3 times, respectively. In addition to the natural increase, the ratio of cutting forces also changes. Reducing the front angle of the blade causes a deterioration in chip formation conditions and leads to an increase in all components of the cutting forces. An increase in the radius at the top of the cutter r causes an increase in the width and decrease in the thickness of the layer to be cut, as well as a decrease in the main angle in the plan φr on the radial part of the blade. The originality. A complex dependence in the structural-stage form was obtained, which gives a clear picture of the influence of each parameter of the turning process on its performance. This dependence is a mathematical model for calculating the optimal operating and geometric parameters of the turning process of high-hard cast irons. The influence of the frontal angle γ, wear value h, and hardness of HB cast iron on the power characteristics during machining of high-hard cast irons has been studied. Practical implementation. It has been shown that it is economically advantageous to maximize the wear of cutting inserts made of relatively expensive composites. In this case, it is necessary to use a technological system of machine-workpiece-tool of high rigidity.

Section: таблиця 1 значення показників ступеняunclassified

Study of cutting forces during turning of high-hard cast irons

Derbaba,

Patsera,

Bohdanov

et al. 2023

“…Також було враховано позитивні результати застосування програмного комплексу NI LabVIEW у попередніх дослідженнях авторів даної статті [12][13][14].…”

unclassified

A virtual device for computer simulation of stresses in the area of blade-chip contact

Patsera,

Derbaba,

Ruban

et al. 2023

Purpose. In modernconditions of training qualified specialists to work in the machine-building industry, there is a need for remote tools for stress research. that arise during the machining of mechanical engineering products. Therefore, the purpose of this work is to create a suitable virtual device. The methods. The research method includes the analysis of known analytical dependencies, the classification of process parameters into adequate input data and functional arguments, and, finally, the construction of a digitized computational algorithm. The software implementation of the created virtual tool was carried out in the NI LabWIEV 7.1 environment. The choice of this software product is based on the following positive methodological features, such as: a powerful tool for creating graphical programs that represent virtual instruments, convenient tools for developing complex experimental stands, automation and control systems, process modeling and other tasks facing modern science, ease of use due to the graphical interface, the ability to create modular programs, support for a variety of hardware and platforms, as well as a wide range of. Findings. The values of normal and tangential stresses in the chip-blade contact zone calculated with the help of a virtual device coincide well with the previously published data. The originality. Considering the accepted restrictions on the intervals of the values of the parameters of the machining processes of steel 45 and steel Cr18N10T, graphs of dependence of normal and tangential stresses on the length of contact of chips with the blade are established. Practical implementation. The created virtual device for computer modelling of stresses in the contact zone of the blade with chips has been successfully implemented in the educational process for master’s and postgraduate students in the specialty 131 Applied Mechanics.

“…Вступ. В останні десятиліття гідравлічні системи набули значного розвитку та знаходять все більш широке використання у багатьох сферах застосування в різних галузях промисловості: авіабудуванні, ракетобудуванні, суднобудуванні, монтажному обладнанні, для роботи з металевими конструкціями, будівельній техніці, виплавці металу, металорізальних верстатах та в багатьох інших [1,2]. Як наслідок, прикладні аспекти проектування гідравлічних систем із застосуванням математичних та фізичних моделей викликають все більшу зацікавленість у науковій спільноті.…”

unclassified

Educational design and modelling of electro-hydraulic control system machine tool motion

Alekseyenko,

Derbaba,

Ruban

et al. 2023

Purpose. To present the design and modeling technology of real electrohydraulic systems, for use in the educational process of a higher educational institution, and the prospects of the proposed approach in the training of technical specialists. As an example, the model of the motion control system of the hydraulic cylinder of the device for fixing parts on the working table of a milling machine, created on the basis of components of the Festo company, is considered. The methods. The methodological basis of the work is a systematic approach, which consists in the use of modern FluidSim software - comprehensive software for creating, modeling and studying, including electro-hydraulic circuits and educational equipment of the Festo company, which allows students to acquire and develop practical skills and at the same time simulate a real working environment . Additional advantages of computer and physical modeling in the educational process are the interactive component, which facilitates the visualization of educational material and improves the process of problem solving. Findings. Taking into account the pedagogical features inherent in the world trends in technical education, the application of a comprehensive approach using computer and physical modeling in the training of technical specialists in the design of electrohydraulic systems is justified in the educational process. The sequence and results of the students' work on one of the options for the implementation of the educational project – the control system for the motion of the hydraulic cylinder of the device for fixing parts on the work table of the milling machine – have been demonstrated. The result of the proposed approach is also an increase in students' motivation, the achievement of a higher level of practical knowledge and skills compared to the traditional model of education. The originality. A modified algorithm for the formation of an extended model of mastering educational material from electro-hydraulic devices and systems with the use of modern software and equipment has been developed. Which allows students to acquire and develop practical skills and at the same time simulate a real working environment. Practical implementation. The materials of the work can serve as a basis for using the proposed integrated approach, which will improve the process of learning and teaching electrohydraulics, ensuring a higher level of learning outcomes, especially in terms of acquiring practical knowledge and skills.