*there are publications only in scientific journals, other author’s publications are not displayed on the website
SCIENTIFIC PAPERS * 2018 / 1 (56)
COMBINED DRIVE MECHANISM OF A PRESS PLATE USED IN FLAT
DIE-CUTTING PRESS (EXPERIMENTAL EVALUATION OF LOADS)
S. V. Ternytskyi, N. M. Kandiak, V. V. Vlakh, O. O. Palamar
In the article, the research of loads (torques) has been carried out that arise on the mechanism drive shaft of the press plate in a flat die-cutting press during process of cardboard consumer packing cutting. It allows making possible to obtain reliable and systematic values of torque, depending on the thickness, type and direction of fibers disposition in cardboard.
There has been developed and designed an experimental test device of the combined mechanism of the press plate with possibility of changing and controlling the speed of the drive shaft. In the developed experimental device, the implementation of a scheme of a flat die-cutting press with a lower movable press plate has been realized. The drive of the press plate is provided by a combined mechanism.
The strain gauge method of torque research has been applied, which made possible obtaining of its reliable data. It has been revealed that the thickness of the cardboard does not affect the nature of the change curve, it only effects the maximum values of torque. For each thickness of the cardboard there is a certain value of torque. In the article, the influence of the cardboard thickness on the value of the torque on the drive shaft of the mechanism has been analyzed including the influence of direction of fibers disposition of cardboard concerning the cutting line. It has been established that with doubled increasing of cardboard thickness, the magnitude of the torque increases by 2.1 times during cutting along the fibers and by 1.65 times across the fibers.
It has been confirmed that the combined drive mechanism of the press plate ensures the parallelism of the plates during the working cycle, which ensures the stability of the machine working process and leads to the increasing of the product quality.
Keywords: packaging, experimental press, die-cutting, ejector pillows, crank-cross head mechanism, cardboard, torque, load.
PRINTING AND PUBLISHING * 2018 / 1 (75)
EXPERIMENTAL EVALUATION OF THE SPEED MODE EFFECT
ON POWER LOADS OF THE COMBINED MECHANISM
OF THE PRESS PLATE DRIVE AT CARDBOARD DIE-CUTTING
S. V. Ternytskyi, N. M. Kandiak, V. V. Vlakh
A laboratory test device for experimental research of a combined mechanism of the press plate drive in a flat die-cutting press has been developed and designed. The torque value on the drive shaft of the mechanism has been experimentally determined during the process of cutting of the cardboard samples of different thickness.
The article is focused on the research of the torques on the drive shaft of the combined mechanism of the press plate that arise in the process of die-cutting the cardboard involutes with different thickness at different values of the speed of the laboratory test device.
A high-precision contactless tachometer has been used for the study of angular velocity on the drive shaft and control of its value during the experimental study. The strain gauge sensors have been used to measure the torque values on the drive shaft of the combined mechanism of the press plate.
It has been revealed that increasing of the crankshaft, which increases the cutting speed, causes a decrease of torque on the drive shaft of the mechanism. The efficiency of the modernization of the press plate drive mechanism in flat die-cutting presses has been confirmed by the application of the suggested mechanism in view of the possibility to operate at various speeds.
It has been revealed that an increase in the rotation speed of drive shaft by four times from 40 rpm to 160 rpm leads to a decrease of the torque values on the drive shaft of the mechanism for cardboard with the thickness of 0.5 mm and 0.7 mm by 13%, and for thin cardboard with thickness of 0.3 mm — by 30%.
The results of experimental studies have proved the expediency of improving the flat die-cutting presses by the mechanism of the lower press plate drive.
Keywords: packaging, die-cutting press, cutting, ejector pillow, crank-cross head mechanism, cardboard, torque, rotation frequency, tachometer
Technological Complexes #1 (13), 2016
AUTOMATED SYNTHESIS OF MECHANISM OF PRESS OF DIE-CUTTING MACHINE
Vlakh V., Pasika V.
The die-cutting process consists of whole complex of operations that help to determine the shape, geometric dimensions and design of cardboard packaging. This process occurs on crucible and rotational die-cutting machine. Working tools are combined die-cutting form, by which all operations are performed simultaneously during one operating run. This article describes the methodology of optimizing the main press mechanism of die-cutting machine that enables improvement of productivity and manufacturing quality and also power reduction of machine drive. The authors investigated analytical dependence on the basis of which synthesis is conducted, software is developed as a tool for analysis and synthesis of investigated mechanism.
BOOK QUALILOGY #2 (28) / 2015
ANALYSIS OF SOFTWARE FOR RESEARCH OF MECHANISMS OF PRINTING AND PACKAGING PRESSES
V. V. Vlakh
Kinematic and dynamic analysis of mechanisms is a necessary stage in the development of new printing and packaging presses, as well as improving the existing ones. Today there are many types of software which you can use to calculate mechanisms on kinematic and dynamic characteristics. The analysis on the Internet has shown that professional computer aided design, which enable to conduct kinematic and dynamic analysis, need additional knowledge to work with them, large hardware resources of the computer, and are very expensive. After several attempts of scientists and engineers to create a cheap, easy to use and feature rich tool have failed. In Europe and the US they have developed solutions that can be used only in professional powerful systems. So the creation of multifunctional, easy to use and inexpensive software for calculating mechanisms is important.
SCIENTIFIC NOTES (Lutsk, LNTU) #48 / 2015
RESEARCH MECHANISMS OF PRINTING AND PACKING MACHINES IN SPECIALIZED CAD
V. V. Vlakh
The author of this article has created computer program to calculate mechanisms. The first version of the program allows to visually create a kinematic scheme of the test mechanism, see an animation of the motion, to conduct kinematic analysis and to take 3D-model that can be applied to other, more powerful systems.The program can be used in the educational process.This article describes the possibilities offered by this CAD on example analysis of mechanisms of printing and packaging machines.
Vetsnik NTU “KPI” 2015, #35 (1144)
METHODOLOGY OF IMPLEMENTATION OF DATA EXPORT, VISUALIZATION AND CREATING 3D MODEL OF MECHANISM IN SPECIAL CALCULATION SYSTEM
V. V. Vlakh
The article examines the methods by which the visualization of mechanisms is created and the transfer of data from specialized software to AutoCAD is done. The software created in Embarcadero Rad Studio Delphi by using object-oriented programming methods. That largely enabled the export of the kinematic scheme of the mechanism and create AutoLISP program, which describes the 3D model.
SCIENTIFIC NOTES (Lviv, UAD) # 4 (49) / 2014
THE AUTOMATED KINEMATICS ANALYSIS OF LEVER MECHANISMS OF POLYDIENE AND PACKING MACHINESIS WITH PERMANENT LENGTHS OF LINKS
V. V. Vlakh, V. R. Pasika, S. M. Komarov
Hierarchically composed software was developed to analyze kinematic parameters of float linkages. The software was created with Embarcadero RAD Studio XE using the base classes library VCL and object oriented programming.
Computer-integrated technologies: education, science, production #6, 2011
COMPUTER KINEMATIC ANALYSIS OF MECHANISMS OF THE SECOND CLASS OF ARBITRARY STRUCTURE
V. V. Vlakh, V. R. Pasika, S. M. Komarov
The article describes a computer program for kinematic analysis of mechanisms of the second class. The analysis is done by dividing of the mechanism into groups of Assur.
PRINTING AND PUBLISHING * 2017/1(73)
MODIFICATION OF A DRIVE MECHANISM OF A PRESS PLATE IN A DIE-CUTTING PRESS
V. О. Kuznetsov, I. І. Rehey, V. V. Vlakh
The article is focused on the design of a drive mechanism of a press plate used in the die-cutting units. It has been identified that the plate is driven via a hinge-lever mechanisms that create the «unwedging» effect necessary to overcome significant technological resistances in the cardboard patterns manufacturing. The analysis of kinematic parameters of crossheads motion has been performed, an asynchronous movement of left and right crossheads has been found out. An alternative drive mechanism of lower press plate has been designed on the basis of master and slave couples of crank-crosshead contours. Mathematical dependences has been derived for the evaluation of kinematic motion of a press plate crossheads. It has been identified that the crossheads move in direct and reverse directions with the same speeds, providing a parallel position of a press plate relatively to the surface of immovable support plate, and the process of punching is completed with no acceleration of the moving plates.
PRINTING AND PUBLISHING * 2016/1(71)
KINEMATIC SYNTHESIS OF DIE-CUTTING PRESS MECHANISM WITH EQUALITY OF FORWARD AND REVERSE MOVES
V. R. Pasika, V. V. Vlakh
The construction of die-cutting presses which consist of the fixed plate with form, the pressure plate, the levering and eccentric mechanisms is characterized by drawbacks due to the fact that the eccentric mechanisms installed diagonally on the drive shaft provide an oscillatory motion to the pressure plate for a period of working and idle moves. It has a negative effect on quality of stamping of the card-board sweeps, degrades the stability of work of the press and limits its performance. This article deals with the kinematic synthesis of this mechanism, which allows increasing the productivity of the press.
MAGAZINE UPAKOVKA (PACKAGING) # 6 (121)-2017
A DRIVE MECHANISM OF PRESS PLATE OF DIE-CUTTING MACHINE
I.I. Regey, V.A. Kuznetsov, V.V. Vlakh
In this article it is considering a new mechanism of a drive of the press plate of the die-cutting machine. This mechanism is based on a combined mechanism and consists of driving and driven slider-crank contours. Kinematic analysis describes that the sliders of the press plate move with the same speed, also it safes parallelism to the stationary plate. The press plate stops in extreme position without acceleration.