Technological scheme of fi nishing and strengthening of parts in screw working elements machines and rationale for their drive power

2020 ◽  
pp. 400-403
Author(s):  
M.M. Chaava ◽  
G.V. Serga ◽  
Al Obaydi Luai Mohammed Rajab
Keyword(s):  
Rotation Axis ◽  
Technological Scheme ◽  
Drive Power ◽  
Asymmetric Loading ◽  
Working Medium ◽  
Working Element ◽  
Screw Rotor ◽  
Screw Rotors ◽  
Tetrahedral Voids ◽  
Load Mass

Typical technological scheme of the machine for finishing and cleaning and strengthening treatment with working elements in the form of screw rotors mounted from tetrahedral voids is presented. Method for calculating of the drive of these machines is proposed, taking into account the load mass, the working element mass and the load mass located asymmetrically in the working element of the rotation axis, which allows you to calculate the power of the electric motors of machines for finishing, cleaning and strengthening treatment taking into account the actions of symmetrical and asymmetric loading processed parts and particles of the working medium relative to the rotation axis of the screw rotor.

scholarly journals Method for calculating the power of a rotor-screw machines

2018 ◽  
Vol 226 ◽  
pp. 01007 ◽  
Author(s):  
Valeriy A. Lebedev ◽  
Georgy V. Serga ◽  
Irina V. Davydova ◽  
Tatiana V. Atoyan ◽  
Irina G. Koshlyakova ◽  
...  
Keyword(s):  
Economic Assessment ◽  
Technological Systems ◽  
Drive Power ◽  
Assessment Study ◽  
Optimal Power ◽  
Screw Machine ◽  
Working Medium ◽  
Screw Rotor ◽  
St3 Steel ◽  
Steel Balls

Features of parts machining in rotor-screw technological systems are presented. It is shown that the mass of the load, consisting of the processed parts and the granulated working medium, is located along the internal perimeter of the screw rotor asymmetrically to the axis of its rotation. In this regard, there are difficulties in designing the rotor-screw machines drive, and in the rationale for its optimal power. A technique is proposed for calculating the drive power of rotor-screw machines, which makes it possible to carry out a techno-economic assessment study of their applicability for finishing-hardening machining of parts in machinebuilding production. The technique is illustrated on the basis of justifying the drive power of a rotor-screw machine for hardening the details of St3 steel in a screw rotor mounted from 9 octahedra, steel balls are used as a working medium.

scholarly journals Main trends in intensification of rotor-screw processing of parts

2018 ◽  
Vol 226 ◽  
pp. 01008 ◽  
Author(s):  
Valeriy A. Lebedev ◽  
Georgy V. Serga ◽  
Irina V. Davydova ◽  
Tatiana V. Atoyan ◽  
Irina G. Koshlyakova ◽  
...  
Keyword(s):  
Structural Changes ◽  
Movement Speed ◽  
Processing Application ◽  
Screw Machine ◽  
Working Element ◽  
Productivity Increase ◽  
Screw Rotor ◽  
Production Organization ◽  
Screw Rotors

The ways of productivity increase in details finishing-strengthening processing executed in rotor-screw technological systems are presented. It is shown that the use of rotor-screw machines makes it possible to combine the parts machining using a vibrating field with a large amplitude of oscillations and their transportation in a streamlined form of production organization. Two main directions of rotor-helical processing stimulation are identified: on the basis of structural changes in the screw rotor, as the main working element of the rotor-screw machine and by equipping the screw rotor with activation elements of the process. The classification of screw rotors is presented, which allows purposeful search for the most effective designs of screw rotors and the mechanism is revealed of their influence on the process of parts finishing-hardening processing. Dependence is established for determining the longitudinal movement speed of the parts being processed in the screw rotor. The constructive-technological scheme of the rotor-screw machine is proposed, which allows increase of the productivity of the process and simplification of the design of machines for their implementation, by dismembering the complex screw propulsion of the load mass, which takes place in the screw rotors, into relatively simple in kinematic sense motions. The technological possibilities of rotor-screw processing application for finishing-strengthening operations are presented.

The pumping characteristics of screw rotors. I. The theory of calculation of the pumping capacity of screw rotors

1987 ◽  
Vol 52 (2) ◽  
pp. 357-371 ◽  
Author(s):  
František Rieger
Keyword(s):  
Present State ◽  
Flow Rate ◽  
Volumetric Flow Rate ◽  
Screw Rotor ◽  
Screw Rotors

This paper summarizes the present state of the theory of calculation of the pumping capacity of screw rotors. The calculation starts from the equation for the volumetric flow rate of the flow between two unconfined plates modified by correction coefficients obtained from the relationships for the flow rate in simpler geometrical configurations to which the screw rotor may be, under certain circumstances, reduced.

scholarly journals FINISH-STRENGTHENING EFFECTIVENESS INCREASE BASED ON USE OF SCREW ROTORS WITH WAVE SURFACE ON PERIMETER

2019 ◽  
Vol 2019 (7) ◽  
pp. 4-10 ◽  
Author(s):  
Валерий Лебедев ◽  
Valeriy Lebedev ◽  
Георгий Серга ◽  
Georgiy Serga
Keyword(s):  
Symmetry Axis ◽  
Rotation Axis ◽  
Acute Angle ◽  
Operating Principle ◽  
Descriptive Geometry ◽  
Wave Surface ◽  
Program Complex ◽  
Engineering Graphics ◽  
Screw Rotors

The paper reports the results of investigations on finish-strengthening improvement. There are offered labor bodies in the form of screw rotors with a wave surface on the perimeter of combined screw rotors in which a rotation axis is located at an acute angle to a symmetry axis. The search of designs of screw rotors with a wave surface on the perimeter was carried out through the methods of descriptive geometry and engineering graphics with the aid of “Compass-3D” program complex. The design and operating principle of machines based on labor bodies in the form of combined screw rotors with a wave surface on a perimeter are shown by the example of the finish-strengthening machine. In the developed classification of machine labor bodies there are presented various forms of their surface on the perimeter.

scholarly journals EXPERIMENTAL DETERMINATION OF CUTTING RESISTANCE STRENGTH AT ASPHALT CONCRETE DESTRUCTION WITH A SINGLE CUTTING ELEMENT

2020 ◽  
Vol 17 (2) ◽  
pp. 196-207
Author(s):  
D. V. Furmanov ◽  
V. S. Chizhov ◽  
N. E. Lysakov
Keyword(s):  
Asphalt Concrete ◽  
Tangential Component ◽  
Operating Conditions ◽  
Recording Equipment ◽  
Drive Power ◽  
Unit Recording ◽  
Cutting Resistance ◽  
Operation Conditions ◽  
Working Element ◽  
Milling Machines

Introduction. The article is devoted to the research results on cutting resistance of a road asphalt concrete in the process of the removal of worn coatings by the working elements of milling machines. The relevance of the work is due to the occurring of new brands of asphalt concrete alongside with the use of new types of cutting elements, for which it is difficult to predict the load on the working element when solving the problems of designing new ones and substantiation the operating conditions of the current machines. The purpose. The objective of the study of the interaction of a single cutting element of a road mill with a material at the best fit of speed and geometric parameters of a cutting process with real machines is solved.Materials and methods. The experimental work was carried out by determining the tangential component of a cutting resistance strength, as well as the work of this strength on a pendulum desk using a unit recording equipment. Four different types of asphalt concrete were being destroyed. A two-factor experiment was conducted for each type of the material. The tangential components of a cutting resistance strength depending on the thickness of the cut chips and the temperature of the material were evaluated.Results. As a result of the experiment, the data were obtained that make it possible to reasonably determine the loads on the teeth of road milling machines, to determine a power capacity of the process and the drive power of the working element. It was found that the growth of the tangential component to a cutting resistance strength occurs quite intensively alongside with an increase in the thickness of the cut chips, only at the initial stages of the penetration of the cutter. With an increase in the thickness of the cut chips, the growth of the tangential component to a cutting resistance strength does not occur so intensively. In all cases the temperature of the material has an impact on the value of a cutting resistance strength, but this effect is less significant for asphalt concrete with a higher crushed stone content.Discussion and conclusion. The obtained data make it possible not only to determine the tangential strength to cutting resistance on the cutting elements of the working element of the milling machine, but also to find rational ways to place the cutting elements on the working element, as well as to determine the rational operation conditions of the current and new machines. This is possible when using the results in a mathematical model that describes the operation of the milling working element as a whole.Financial transparency: the authors have no financial interest in the presented materials or methods. There is no conflict of interest.

A mathematical model of the rotor profile of the single-screw compressor

2002 ◽  
Vol 216 (3) ◽  
pp. 343-351 ◽  
Author(s):  
S-C Yang
Keyword(s):  
Mathematical Model ◽  
Parameter Family ◽  
Cutting Edge ◽  
Screw Compressor ◽  
Single Screw ◽  
Rotor Profile ◽  
The Family ◽  
Screw Rotor ◽  
The One ◽  
Screw Rotors

This paper presents a method for determining the basic profile of a single-screw compressor including a gate rotor and a screw rotor. The inverse envelope concept for determining the cutting-edge curve of the gate rotor is presented. Based on this concept, the required cutter for machining the screw rotor can be obtained by an envelope of the one-parameter family of obtained screw rotors. The obtained screw rotor is an envelope of the family of gate rotor surfaces. Let the obtained envelope of the one-parameter family of gate rotor surfaces become the generating surface. The inverse envelope can be used to obtain the envelope of the family of generating surfaces. Then, the profile of the gate rotor with the cutting-edge curve can be easily obtained. The proposed method shows that the gate rotor and the screw rotor are engaged along the contact line at every instant. This is essential to reduce the effect of leakage on compressor performance. In this paper, a mathematical model of the meshing principle of the screw rotor with the gate rotor is established. As an example, the single-screw compressor for a compressor ratio of 11:6 is determined with the aid of the proposed mathematical model. Results from these mathematical models should have applications in the design of single-screw compressors.

scholarly journals EQUIPMENT FOR GRINDING-FINISHING BASED ON SCREW ROTORS

2020 ◽  
pp. 11-22
Author(s):  
Aleksandr Sekisov ◽  
Georgiy Serga
Keyword(s):  
Scientific Work ◽  
Wide Range ◽  
Screw Rotor ◽  
The Creation ◽  
Operation Environment ◽  
Screw Rotors

The results of a long-term scientific work in the field of the creation of machines, plants, devices for machinery finishing for the creation of innovation equipment based on screw rotors are shown. There are presented standard structures of machines ensuring machining a wide range of parts of engineering enterprises. There are formulated basic recommendations for a choice of machining operation environment as such one can use abrasives and non-abrasives of different granulation. These recommendations take into account material, mass, rigidity of the parts worked and a grade of screw rotors. There is shown an example of calculation and an experience of designing a plant for parts continuous grinding-finishing on the basis of a screw rotor of the IIId grade. Working drawings and technologies for manufacturing operation units of these machines and plants are offered.

AGGREGATED COMPLEXES FOR RICE GRAIN PROCESSING

2020 ◽  
Vol 20 (2) ◽  
pp. 41-46
Author(s):  
V. Petrov ◽  
A. Zhdanov ◽  
R. Mazej
Keyword(s):  
Rotation Axis ◽  
Air Separation ◽  
Technological Scheme ◽  
Rice Grain ◽  
Laboratory Equipment ◽  
Practical Applications ◽  
Grain Processing ◽  
Size Number ◽  
Vertical Rotation Axis ◽  
Selection Of

The paper considers various designs of aggregated complexes for the processing of rice grain. Their technological schemes were built and analyzed, and a breakdown into modules was performed. This allowed us to group the various designs of units and summarize their technological capabilities. The general reduced technological scheme of rice grain processing is considered. The noted variations are as far as practical applications with and without a grain cleaning module. Various schemes of hulling of grain and selection of hulled grain from unlulled are presented. The technological schemes with various hulling machines are analyzed (the Engleberg hulling machine, with rubberized rolls, centrifugal action), which have their own characteristics. The differences in the use of paddy machines and trimers for sorting grain after hulling are considered. The cylindrical trieurs used to select the rice kernel have an original technological scheme (company Yanmar). This allows you to simplify technological communications and make the unit more compact. The units use more compact paddy machines (reduced size, number of tiers, etc.), which, of course, affects their performance. The most common combined machine with a single-pass technological scheme (which was named after the first inventor and manufacturer, a hulling machine from Satake) is considered. In addition to laboratory equipment, centrifugal hulling machines are used in grain processing units, which gives additional advantages (a more compact scheme, due to the combination of several technological operations, hulling, transporting the grain stream, and air separation. For the majority of broken and unbroken grains sieve separators are used for simple circuits. Separators with vertical rotation axis, that allows to transport the rice to a predetermined height. This makes it possible to link this separator, for example with electronic scales.

scholarly journals Processing Equipment on the Basis of Operative Parts in the Form of Screw Rotors With Profiled Perimeter

2019 ◽  
Vol 297 ◽  
pp. 02004 ◽  
Author(s):  
Valery Lebedev ◽  
Georgy Serga ◽  
Lidianna Chunakhova ◽  
Mikhail Selemenev
Keyword(s):  
Machine Tools ◽  
Internal Cavity ◽  
Geometrical Shape ◽  
Technological Equipment ◽  
Processing Equipment ◽  
Continuous Rotation ◽  
Screw Rotor ◽  
Working Bodies ◽  
Screw Rotors

The main working body of technological equipment of screw rotor technological systems are screw rotors which present spatial objects with an original geometrical shape of working body perimeter in which component parts and granules of the processing environment carry out simultaneously continuous rotation around the axis of working body and progressive motion, constantly moving along a horizontal axis of working body rotation. This article gives a classification of perimeter forms of working bodies, such as screw rotors, which let to expand technological possibilities of technological equipment and to provide the increase of effectiveness of the production process by means of increase of its amplitude-frequency characteristics. The peculiarity of working bodies in the form of screw rotors is the fact that internal cavity of a rotor has a wavy shape, formed by the sides of a semicircular form. The paper covers on a construction and the principle of operation of machine-tools on the basis of working bodies in the form of screw rotors with a shaped surface on perimeter. The suggested design solutions of processing equipment allow creating highly effective machine-tools for the finishing and strengthening processing.

scholarly journals A correction method of screw rotor profile error based on parameter adjustment for grinding wheel dresser

2018 ◽  
Vol 10 (9) ◽  
pp. 168781401879897 ◽  
Author(s):  
Lijia Tao ◽  
Yu Xing ◽  
Mingxin Yuan ◽  
Sijie Chen
Keyword(s):  
Correction Method ◽  
Numerical Control ◽  
Grinding Wheel ◽  
Profile Error ◽  
Dressing Method ◽  
Parameter Adjustment ◽  
Rotor Profile ◽  
Wheel Profile ◽  
Screw Rotor ◽  
Screw Rotors

Accuracy of grinding wheel profile that is generated by form grinding theory and formed by grinding wheel dresser is a crucial factor affecting profile accuracy of screw rotors. A correction method for screw rotor profile error based on parameter adjustment for grinding wheel dresser such as diameter and distance of diamond rollers is proposed. Influence of diameter and distance of diamond rollers on grinding wheel profile and screw rotor profile based on theory of segmented dressing method is analyzed, and the adjustment method for parameters of grinding wheel dresser is presented. The results of the analysis provide a theoretical basis for error correction in screw rotor grinding. Grinding experiments for female rotor were performed due to the character that the female rotor has smooth bottom profile where the change of profile error is easy to observe. The experimental results show that the height difference between the long and short sides of rotor profile at the bottom of the rotor is significantly reduced from 0.22 mm to 0.034 mm by adjusting diameter of diamond rollers, and the distance between the long and short sides of the actual rotor profile is almost consistent with the theoretical one by measuring the distance again and adjusting its value in the computer numerical control system. These results verify the correctness of the correction method.

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