scholarly journals FORMATION OF WORKING SURFACES OF A WORM WHEEL AND A WORM WITH A TOOTH-CUTTING TOOL WITH A MODIFIED PRODUCING SURFACE BY THE METHOD OF COMPUTER SIMULATION

2021 ◽  
pp. 59-68
Author(s):  
S. A. Ryazanov ◽  
M. K. Reshetnikov ◽  
V. V. Shpilev
Keyword(s):  
Computer Simulation ◽  
Geometric Modeling ◽  
Cutting Tool ◽  
Analytical Description ◽  
Theoretical Studies ◽  
Modeling Tools ◽  
Cad Systems ◽  
Worm Wheel ◽  
Interacting Surfaces ◽  
Tooth Cutting

Substantiated the relevance of theoretical studies on the use of modern CAD systems, which make it possible to move away from the analytical description of interacting surfaces and focus on the implementation of algorithms for their interaction. The use of geometric modeling tools for virtual imitation cutting of elements involved in the formation of a worm pair is shown. The use of a modified generating surface is shown to introduce errors that inevitably arise when trying to form and use a real worm pair.

Development of an Image-Based CAD Using Wavelet Transform

2000 ◽  
Author(s):  
Soonkyu Yim ◽  
Hae Chang Gea
Keyword(s):  
Wavelet Transform ◽  
Geometric Modeling ◽  
Haar Wavelet ◽  
Layered Manufacturing ◽  
File Size ◽  
Modeling Tools ◽  
Data Format ◽  
Haar Wavelet Transform ◽  
Cad Systems ◽  
Cad Models

Abstract Traditionally, designers describe features of objects from various geometric modeling tools. However, a geometry-based system requires complex mathematical formulations and data structures that make it very cumbersome to manipulate. Furthermore, Layered Manufacturing (LM) has become a prominent manufacturing technology in recent years. To support LM under geometry based CAD systems, users have to slice the model into layers. It is obvious that geometric characteristics of the geometry-based CAD models are destroyed during these conversions, at the same time, additional efforts and costs will be accumulated. To bridge the gap between CAD and LM, an image-based data format instead of a geometry based data format is proposed to serve as the foundation of CAD systems in this paper. A wavelet transform is used to reduce the file size and produce multi-resolution image map. To further increase the computational efficiency of the algorithm, we developed the Reduced Haar Wavelet transform and a bit-remainder index.

scholarly journals GEOMETRIC MODELING AND COMPUTER SIMULATION GRADING PRODUCTS WITH ELLIPTICAL CENTROID

2019 ◽  
Vol 6 (2) ◽  
pp. 049-058
Author(s):  
A. A. Lyashkov ◽  
◽  
A. Ya. Reinhard ◽  
G. E. Murashev ◽  
◽  
...  
Keyword(s):  
Computer Simulation ◽  
Geometric Modeling

scholarly journals Module and functionally-oriented techniques in designing and manufacturing worm gears

2017 ◽  
Vol 2 (3) ◽  
pp. 37-44
Author(s):  
Сергей Лагутин ◽  
Sergey Lagutin ◽  
Александр Сандлер ◽  
Aleksandr Sandler ◽  
Евгений Гудов ◽  
...  
Keyword(s):  
Machine Tools ◽  
Mechanical Engineering ◽  
Cutting Tool ◽  
Theory And Practice ◽  
Training Manual ◽  
Worm Wheel ◽  
Production Experience ◽  
Worm Gears ◽  
And Performance ◽  
Required Quality

Worm gears of different purposes and dimensions belong to those objects of mechanical engineering which are connected with science intensive design works (computations and development of design arrangements) and with their not less science intensive technological realization in the course of production. In 2016 the authors published a training manual “Theory and practice of general worm gears production” (M. Infra-Engineering, 2016. – pp. 346) where there is generalized a scientific-production experience of enterprises of mechanical engineering and machine tools manufacture for the formation of the complex of modular and functionally-oriented technologies ensuring required quality and performance characteristics of such objects. As a distinctive feature of such a complex is the interconnection of design and production processes of gear basic parts: a worm, a worm wheel with similar processes in the formation of a producing surface in a gear-cutting tool for a worm wheel.

Calculation of the Digital Prototype for Modification of the Initial Straight Profile to the Form of the Tooth-Cutting Tool’s Producing Surface

2021 ◽  
pp. 35-46
Author(s):  
S. Ryazanov ◽  
M. Reshetnikov
Keyword(s):  
Cutting Tool ◽  
Worm Gear ◽  
Geometric Parameters ◽  
Kinematic Chains ◽  
Gear Cutting ◽  
Working Surface ◽  
Worm Wheel ◽  
Worm Gearing ◽  
Worm Gears ◽  
High Level

Spatial helical gears, worm gears with a cylindrical worm, globoid gears, etc., are widely used in most of modern engineering products [1-3; 37; 42]. Cylindrical worm gears are actively used in the creation of metalworking equipment (push mechanisms of rolling mills, presses, etc.), in lifting and transport machines, in drives and kinematic chains of various machine tool equipment where high kinematic accuracy is required (dividing machine tools, adjustment mechanisms), etc. In a worm gear a cylindrical worm or its cylindrical helical surface can be cut by various technological methods [49-51], but no matter how the shaping of the worm gear elements’ working surfaces is carried out, the worm wheel is cut with a gear cutting tool, whose producing surface coincides with the worm thread’s lateral surface [19; 22; 23]. In this regard, the working surface of the cylindrical worm wheel’s tooth, even with a non-orthogonal arrangement of axes, is an envelope of a one-parameter family of surfaces that gives a linear contact, which presence makes it possible to transfer a large load using a worm gear. For high-quality manufacturing of worm gears, it is necessary to design and manufacture a productive gear cutting tool - an accurate worm cutter, whose shaping (working) surface must be identical to the profiled worm’s shaping (working) surface [24-27; 54]. One of the most important tasks in the implementation of worm gearing is the problem of jamming of the cylindrical worm and the worm wheel’ contacting surfaces. This problem is excluded by relieving the contacting surfaces’ profile along the contact line. Considering that any violations of contacting surfaces’ geometric parameters affect the change in their geometric characteristics, the tasks of accurately determining the adjustment parameters of the technological equipment, used for shaping the worm and worm wheel, enter into in the foreground of the worm gearing elements production. In modern conditions of plant and equipment obsolescence, and in particular, of gear cutting machines used for worm gears manufacture, these machines physical wear, implies an inevitable decrease in the accuracy of their kinematic chains. Therefore, in order to maintain the produced gears’ quality at a sufficiently high level, it is necessary to use deliberate modification of contacting surfaces when calculating the worm gearing’s geometric parameters; such modification reduces the worm gear sensitivity to manufacturing and mounting errors of its elements [28-31].

Miniaturization of Printed Microstrip Antennas Array by Using Defected Ground Structure Technique

2019 ◽  
pp. 101-146
Author(s):  
Otman Oulhaj ◽  
Amar Touhami Naima ◽  
Aghoutante Mohamed
Keyword(s):  
Computer Simulation ◽  
Radiation Pattern ◽  
Pattern Matching ◽  
Input Impedance ◽  
Microstrip Antennas ◽  
Design System ◽  
Theoretical Studies ◽  
Defected Ground Structure ◽  
Planar Antennas ◽  
Miniature Antennas

In this chapter, the authors present different techniques used to miniature microstrip antennas, particularly planar antennas array, for different applications demanding small dimensions. This will cover DGS, slot technique, and metamaterials. After the presentation of these techniques based on theoretical studies, the second part of this chapter will be about the authors' contribution in the miniaturization of microstrip antennas arrays. This part will include the presentation of some miniature antennas array which they have validated into simulation and measurement by using DGS techniques. The different structures were validated into simulation by using tow electromagnetic solvers ADS (advanced design system) and CST-MW (computer simulation technology) which permit one to validate and to verify the different performances of antennas arrays as radiation pattern, matching input impedance and small dimensions.

Geometric Modeling of Cutter/Workpiece Engagements in 3-Axis Milling Using Polyhedral Models

2007 ◽  
Author(s):  
Eyyup Aras ◽  
Derek Yip-Hoi
Keyword(s):  
Cutting Forces ◽  
Geometric Modeling ◽  
Tool Path ◽  
Cutting Tool ◽  
Milling Process ◽  
Mapping Technique ◽  
Depth Of Cut ◽  
Modeling Methodology ◽  
Machining System ◽  
Engagement Angle

Modeling the milling process requires cutter/workpiece engagement (CWE) geometry in order to predict cutting forces. The calculation of these engagements is challenging due to the complicated and changing intersection geometry that occurs between the cutter and the in-process workpiece. This geometry defines the instantaneous intersection boundary between the cutting tool and the in-process workpiece at each location along a tool path. This paper presents components of a robust and efficient geometric modeling methodology for finding CWEs generated during 3-axis machining of surfaces using a range of different types of cutting tool geometries. A mapping technique has been developed that transforms a polyhedral model of the removal volume from Euclidean space to a parametric space defined by location along the tool path, engagement angle and the depth-of-cut. As a result, intersection operations are reduced to first order plane-plane intersections. This approach reduces the complexity of the cutter/workpiece intersections and also eliminates robustness problems found in standard polyhedral modeling and improves accuracy over the Z-buffer technique. The CWEs extracted from this method are used as input to a force prediction model that determines the cutting forces experienced during the milling operation. The reported method has been implemented and tested using a combination of commercial applications. This paper highlights ongoing collaborative research into developing a Virtual Machining System.

Geometric Modeling of Cutter/Workpiece Engagements for Helical Milling With Flat End Mills

2007 ◽  
Author(s):  
Eyyup Aras ◽  
Derek Yip-Hoi
Keyword(s):  
Geometric Modeling ◽  
High Speed ◽  
Tool Path ◽  
Cutting Tool ◽  
Milling Process ◽  
Helical Milling ◽  
Mapping Technique ◽  
Depth Of Cut ◽  
Modeling Methodology ◽  
End Mills

Helical milling is a 3-axis machining operation where a cutting tool is feed along a helix. This operation is used in ramp-in and ramp-out moves when the cutting tool first engages the workpiece, for contouring and for hole machining. It is increasingly finding application as a means for roughing large amounts of material during high speed machining. Modeling the helical milling process requires cutter/workpiece engagements (CWEs) geometry in order to predict cutting forces. The calculation of these engagements is challenging due to the complicated and changing intersection geometry that occurs between the cutter and the in-process workpiece. In this paper we present a geometric modeling methodology for finding engagements during helical milling with flat end mills. A mapping technique has been developed that transforms a polyhedral model of the removal volume from Euclidean space to a parametric space defined by location along the tool path, engagement angle and the depth-of-cut. As a result, intersection operations are reduced to first order plane-plane intersections. This approach reduces the complexity of the cutter/workpiece intersections and also eliminates robustness problems found in standard polyhedral modeling and improves accuracy over the Z-buffer technique. The reported method has been implemented and tested using a combination of commercial applications. This paper highlights ongoing collaborative research into developing a Virtual Machining System.

scholarly journals USING COMPUTER SIMULATION TO AID THE RESERCH OF DRILLING PROCESSES

2019 ◽  
pp. 13-19
Author(s):  
Marina S. Popova ◽  
Anton Y. Kharitonov ◽  
Sergey N. Parfenyuk
Keyword(s):  
Computer Simulation ◽  
Cutting Tool ◽  
Mineral Exploration ◽  
Integrated Approach ◽  
Rock Cutting ◽  
Drilling Process ◽  
Primary Methods ◽  
Drilling Tool ◽  
Software Products ◽  
Advantages And Disadvantages

Drilling wells is one of the primary methods used for mineral exploration. Scientific studies have aimed at improving the technical and economic aspects of drilling because of the current competitive economic conditions. Note that the primary topic of these studies has been developing new effective rock-cutting tools. To design a new rock-cutting tool, a thorough, reliable, and accurate study of the processes that occur during drilling is necessary. During drilling, mechanical, hydraulic, thermal, and chemical phenomena, which are interdependent and affect the performance of a drilling tool, simultaneously occur; therefore, a systematic, integrated approach is required for studying drilling processes. Field-based and laboratory experiments are quite tedious to perform and require high material costs, and it is often not possible to separately evaluate small elements of the drilling model. Therefore, computer simulation is an important research tool that enables accurate and reliable visualization of even small parts of the model. The aim. The aim of this study is to examine the potential for computer simulation of the processes that occur during drilling. Objective. In this study, we evaluated the simulation features of various software products, such as KOMPAS-3D, ANSYS, Delphi, and LabVIEW, for their utility in studying the processes that occur during drilling. The possibility of computer simulation for studying drilling processes, including its advantages and disadvantages, are demonstrated. The results are obtained from a model that simulates a rock cutting tool. The main uses of the rock cutting tool are outlined, and the drilling simulation development is planned. Choice of research method. The study of the capabilities of existing modern software products, for use in drilling process research, is carried out by an analytical review method.

scholarly journals Automation of the inner design of the aircraft

2019 ◽  
Vol 11 (S) ◽  
pp. 135-141
Author(s):  
Mikhail Yu. KUPRIKOV ◽  
Leonid V. MARKIN
Keyword(s):  
Design Automation ◽  
Geometric Modeling ◽  
Virtual Prototyping ◽  
Practical Implementation ◽  
Cad Systems ◽  
Geometric Models ◽  
Modern Computer ◽  
Modeling Systems ◽  
Swept Surface ◽  
Blind Search

The task of forming the wind-swept surface according to the results of the aircraft’s inner design is described. The approach of the integration of natural and virtual prototyping in the design of equipment compartments is substantiated. Such approaches open up new possibilities for creating intelligent composition algorithms that eliminate the "blind search". For the practical implementation of these approaches, it is necessary to link the appropriate software to standard geometric modeling systems in the form of additional computational modules. Preparing the aircraft for design automation complicates the mathematical description of geometric models of placed objects, increases the complexity of their visualization in modern computer graphics systems and the need to create an additional interface between new geometric models and common CAD systems (SolidWorks, AutoCAD, COMPAS, etc.).

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