КІНЕТОСТАТИЧНЕ ДОСЛІДЖЕННЯ ШАРНІРНИХ ПРОСТОРОВИХ МЕХАНІЗМІВ ГАЛТУВАЛЬНИХ МАШИН (ЧАСТИНА 2: ДОСЛІДЖЕННЯ МЕХАНІЗМУ МАШИНИ З ДВОМА РОБОЧИМИ ЄМКОСТЯМИ, ЩО З’ЄДНАНІ ПОСТУПАЛЬНОЮ КІНЕМАТИЧНОЮ ПАРОЮ)

Goal. Kinetostatic study of a statically defined hinged spatial mechanism without excessive (passive) connection of the shredding machine with two working tanks connected by a translational kinematic pair. Method. Radial and axial components of reactions in all rotating and translational kinematic pairs of the hinged statically defined spatial mechanism of the machine for processing of details with two working capacities connected among themselves by translational kinematic pair at its work at idling were determined on the basis of kinetostatic research. The study was performed using the computer-aided design system SolidWorks-2016 computer-aided design system, which performed a 3D model of a shredding machine with two working tanks connected by a translational kinematic pair. Results. 3D modeling of a shredding machine with two working tanks connected by translational kinematic pair in the computer-aided design system SolidWorks-2016 computer-aided design system is performed, maximum values of radial and axial components of reactions in all rotating and translational kinematic pairs of machine are determined, and the influence of total two working tanks for the increase of the maximum values of reactions in the kinematic pairs of the spatial mechanism of the machine. Scientific novelty. For the first time, the relationship between the total wheelbase of two working tanks and the change in the maximum values of reactions (axial and radial) in all rotating and translational kinematic pairs of the shredding machine was established. The allowable range of variation of the total wheelbase of two working tanks is determined, which creates conditions for long-term operation of the machine. Practical significance. It is established that the change of maximum values of radial and axial components of reactions in all rotating and translational kinematic pairs of the spatial mechanism of the galvanizing machine depends on the total axial distance of two working capacities of the machine. The obtained research results can be useful in the design of shredding equipment with complex spatial movement of working tanks.

Structural Synthesis and Analysis of Mechanisms with an Output Link Performing Two Rotational and One Translational Movements

The article considers mechanisms based on a hinged flat parallelogram with an additional link, ensuring the ability to maintain the insertion point of the tool installed on the output link. A rotational kinematic pair coupled to the base allows the plane of rotation of the articulated parallelogram to change the angle of inclination. The proposed design should have a greater load capacity than the available analogues, since the rotational kinematic pair mating the articulated parallelogram with the base is made in the form of two semi-axes, and the output link is located between the intermediate links of this parallelogram. The equality of the rotation angles of the output link and the intermediate links of the articulated parallelogram is ensured by the presence of additional links or belt drives. Three-dimensional models of these mechanisms are presented, and their structural synthesis is carried out in various modifications. Depending on the modification, it becomes possible to apply such mechanisms not only in industry, including additive technologies, but also in the field of medicine during surgical operations and in the study of plasma properties.

The analysis of fretting fatigue in forced-in joint with the induction-hardened shaft

Subject to the analysis was a tribological kinematic pair consisting of shaft and sleeve, both made of C45 steel. The elements were joined by pressing with the 0.02 mm tolerance. The shaft was subjected to the finishing and strengthening treatment consisting in induction hardening. The tribological kinematic pair made in such way was tested on a fatigue testing machine, which permitted obtaining a rotational bending moment. Macroscopic investigations of the unhardened shaft demonstrated, on the shaft surface, the traces of fretting wear in the form of a ring of the uniform width comprising the entire axle seat circumference. Based on the test results, it may be concluded that the use of the shaft induction hardening process has caused the reduction of fretting wear development compared to shafts without additional treatment. In this case, Wear traces in the form of small diameter ring comprising the entire shaft circumference are observed on one side of the shaft axle seat.

Improvement on Planar Mechanism Composition Principle

By investigation of movement of the Assur groups in normal connecting condition, and by inspection of the kinematic pair concept, the conclusions were found that “The freedom of Assur group is zero” in the Planar Mechanism Composition Principle conflicts with the fact that Assur group can move, and the external kinematic pairs of Assur group are inconsistent with the kinematic pair concept. Proposals were put forward then that the motion characteristics of Assur group should be studied in normal connecting conditions, Grade I Linkage Group should be introduced, and the PPP Type Linkage Group existence as an example was provided. Some new views were put forward in discussion of Planar Mechanism Composition Principle. And then an example of mechanism analysis was given to show that the correct statement of the Mechanism Composition Principle is helpful to solve mechanism analysis problems.

ДОСЛІДЖЕННЯ КІНЕМАТИЧНИХ ПАРАМЕТРІВ МАШИНИ ДЛЯ ОБРОБКИ ДЕТАЛЕЙ З ДВОМА ЄМКОСТЯМИ, ЩО ВИКОНУЮТЬ СКЛАДНИЙ ПРОСТОРОВИЙ РУХ

Investigation of the main kinematic parameters of a shredding machine with two moving tanks connected by a translational kinematic pair and performing complex spatial motion to be able to further predict the technological result at the design stage of such equipment and the corresponding technological operations of machining parts. Using the SolidWorks-2016 Motion computer-aided design system, 3D modeling was carried out, followed by kinematic analysis, of a machine for processing parts with two movable capacities, which are interconnected by a translational kinematic pair and perform complex spatial motion. The essence of kinematic analysis was to determine the linear velocities and accelerations of points that coincide with the ends of the working tanks of the machine. Based on 3D modeling and kinematic analysis in the SolsdWorks-2016 Motion computer-aided design system, some kinematic parameters of the machine are determined, in particular, the law of the change in the angular velocity of the driven shaft of the machine is obtained in the form of graphical dependencies, the change in the translational speed and translational acceleration of four points, which are conventionally located in the center, is studied the ends of each of the working capacities. The relationship between some kinematic parameters of the developed machine design with two moving capacities that perform complex spatial motion is established. It was found that the kinematic parameters of the two tanks of the machine differ from each other, as a result of which, during the execution of the corresponding technological operations, the intensity of movement of the working array in the two capacities will differ from each other. In addition, the ends of each of the working capacities move with almost the same kinematic parameters, which will facilitate the movement of the working array between the opposite ends of both tanks in opposite directions with the same intensity. The results obtained make it possible to determine the most rational functional purpose of the machine under study.

Determination of distortions of the driven links of multilink mechanisms of technological machines

A method is proposed for determining the distortions of the driven links of technological machines as applied to the heald movement mechanisms (HMM) of the weaving machines during yaw formation. The method is based on calculating the reduced total gaps to the left and right ends of the heald as functions of the position of the leading link of the HMM and on statistical analysis. Keywords heald movement mechanism, transfer function, kinematic pair, gap. [email protected]

IMPACT OF SELECTED BIOFUELS AND DIESEL AS LUBRICANTS ON THE STATISTICAL DISTRIBUTION AND COURSE OF SLIDING FRICTION COEFFICIENTS FOR THE KINEMATIC PAIR 100Cr6-100Cr6

One of the functions of engine fuels is the lubrication of engine injection equipment components. The elements of the injection system are lubricated only with the fuel used to power the engine; therefore, the lubricity and its impact on the elements of the engine injection system are an important issue. The share of biofuels to power internal combustion engines is constantly increasing, because EU Member States are required to use fuel with the addition of biocomponents to power vehicle engines. These fuels are more ecological compared to petroleum fuels. Therefore, it is also necessary to identify the lubricating properties of these fuels, which can significantly affect wear processes. In order to identify wear indicators, laboratory tests were carried out to determine the lubricating properties of biofuels based on vegetable oils in relation to diesel fuel. Tribological tests were carried out for the ball-disc friction node of 100Cr6 material, which is most often used in the construction of precision pairs of injection equipment. Comparative tests were carried out for samples immersed in a fuel bath on a CSM tribometer. The friction coefficient waveforms as a function of friction distance and sample load were determined. The measured force values indicate a significant impact of the fuel used on the operating conditions and consumption in the kinematic pair being the subject of the work.

Reliability Analysis of Critical Kinematic Pair of the RD-33 Engine

The article addressed the technological problem occurring in the RD-33 turbine engine on the kinematic pair between the accessory gearbox (AGB) and fuel regulator pump HP-59A (Polish: NR-59A). In the beginning, examples of operational problems were described. Then, the power balance for the accessory gearbox and strength calculations of gear and splines of a critical pair were presented. It was demonstrated that gear made from an original material complies with strength criteria and the observed operational problems with splines are created by other factors.