New Approach to Computerized Design of Spur and Helical Gears

2003 ◽  
Author(s):  
V. I. Goldfarb ◽  
A. A. Tkachev
Keyword(s):  
Computer Aided Design ◽  
Cutting Tool ◽  
New Approach ◽  
Helical Gears ◽  
Gear Design ◽  
Cylindrical Gears ◽  
Initial Stage ◽  
Dynamic Blocking ◽  
Aided Design ◽  
Meshing Process

The approach to the design of spur and helical cylindrical gears is being considered on the basis of application of special type geometrical objects named dynamic blocking contours (DBC) by means of which the rational choice of addendum modification coefficients (profile shift coefficients) of pinion and gearwheel is carried out. The stage of shift coefficients selection by means of DBC is singled into an independent procedure during which some gear qualities may be forecast before basic geometrical and strength calculations, that is, at the initial stage of design. Based on the concept of DBC, the computer-aided design of spur and helical gears has been developed with the practical realization of the stated design principles. In order to provide better obviousness of the design, CAD includes visualization units of meshing process of gear pair and meshing element generation by rack type cutting tool. Educational release of the developed system allows the user to master the methodology and possibilities of gear design on the basis of DBC concept and to evaluate the importance of shift coefficients selection to obtain specified properties of gears.

scholarly journals Computer aided design of sequencing problem – the concept of Paint Shop 4.0

Mechanik ◽  
2018 ◽  
Vol 91 (7) ◽  
pp. 529-531
Author(s):  
Jolanta Krystek ◽  
Sara Alszer ◽  
Szymon Bysko
Keyword(s):  
Automotive Industry ◽  
Computer Aided Design ◽  
Industry 4.0 ◽  
Paint Shop ◽  
Actual Structure ◽  
New Approach ◽  
Digital Factory ◽  
Sequencing Problem ◽  
Car Body ◽  
Aided Design

Presented is the concept of paint shop operation for the automotive industry – Paint Shop 4.0, based on the ideas of Industry 4.0 and Digital Factory. A new approach to the issue of car body sequencing, taking into account the actual structure of the paint shop department with buffers, has been presented. In the created application, proprietary car body sequencing algorithms were implemented.

scholarly journals Research on the Design and Modification of Asymmetric Spur Gear

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Xiaohe Deng ◽  
Lin Hua ◽  
Xinghui Han
Keyword(s):  
Computer Aided Design ◽  
Design Method ◽  
Geometric Model ◽  
Simulation Method ◽  
Transmission Error ◽  
Spur Gear ◽  
Geometric Shape ◽  
Spur Gears ◽  
Gear Design ◽  
Aided Design

A design method for the geometric shape and modification of asymmetric spur gear was proposed, in which the geometric shape and modification of the gear can be obtained directly according to the rack-cutter profile. In the geometric design process of the gear, a rack-cutter with different pressure angles and fillet radius in the driving side and coast side was selected, and the generated asymmetric spur gear profiles also had different pressure angles and fillets accordingly. In the modification design of the gear, the pressure angle modification of rack-cutter was conducted firstly and then the corresponding modified involute gear profile was obtained. The geometric model of spur gears was developed using computer-aided design, and the meshing process was analyzed using finite element simulation method. Furthermore, the transmission error and load sharing ratio of unmodified and modified asymmetric spur gears were investigated. Research results showed that the proposed gear design method was feasible and desired spur gear can be obtained through one time rapid machining by the method. Asymmetric spur gear with better transmission characteristic can be obtained via involute modification.

Computer Implementation of an Optimal Conformal Mapping for Gear Tooth Stress Analysis

1989 ◽  
Vol 111 (2) ◽  
pp. 297-305 ◽  
Author(s):  
M. J. Richard ◽  
D. Pare ◽  
A. Cardou
Keyword(s):  
Conformal Mapping ◽  
Stress Analysis ◽  
Computer Aided Design ◽  
Gear Tooth ◽  
Spur Gear ◽  
Concentrated Load ◽  
New Approach ◽  
Gear Teeth ◽  
Aided Design ◽  
Mapping Theory

This paper describes a computerized version of the complex potential approach which is a comprehensive mathematical model for the stress analysis of spur gear teeth. The entire procedure is a basic application of Hirano’s conformal mapping theory in which laws of elasticity have been combined. The main concepts of the method have been explained in previous publications but the work described herein is an appreciable extension of this relatively new approach. The algorithm is eminently well-suited for computer-aided-design of gear teeth; it serves as the basis for an interactive computer program which can model a gear tooth and can calculate the stresses and displacements within the tooth when subjected to a concentrated load. Results are compared with AGMA’s and other published values.

Design of Gear Parameters Visual System Based on LISP

2014 ◽  
Vol 539 ◽  
pp. 42-46
Author(s):  
Hong Tao Guo ◽  
Wei Guo Zhang
Keyword(s):  
Computer Aided Design ◽  
Design System ◽  
Two Dimensional ◽  
Cylindrical Gear ◽  
Design Efficiency ◽  
Improve Design ◽  
Gear Design ◽  
Development Tools ◽  
Design Calculations ◽  
Aided Design

Article use Visual LISP development tools and DCL dialog technology, which implements the standard straight teeth, a two-dimensional cylindrical gear parametric drawing on AutoCAD platform, with easy to operate and improve design efficiency. We achieved that using the dialog box design input parameters, and gear parts of the design calculations, parameters proofreading and all kinds of gear design drawing different structures by programming. The output is fully automated computer-aided design system. The results show that the design of the system significantly improves the efficiency of the part design.

Interference-free tool orientation determination by a virtual enveloping element for five-axis machining of a freeform surface

2001 ◽  
Vol 215 (12) ◽  
pp. 1683-1693 ◽  
Author(s):  
R S Lee ◽  
J N Lee
Keyword(s):  
Computer Aided Design ◽  
Cutting Tool ◽  
Contact Length ◽  
Freeform Surface ◽  
Tool Orientation ◽  
Surface Machining ◽  
Cad Cam ◽  
Rear Gouging ◽  
Aided Design ◽  
Five Axis

In machining freeform surfaces on five-axis machine tools, it is very important to determine the location of the cutting tool. The commercial computer aided design/manufacturing (CAD/CAM) software for five-axis machining often lacks flexibility to specify the appropriate tool orientation and toolpath for surface machining. This paper presents a new methodology for determining feasible tool orientation of a toroidal milling cutter with collision and gouging avoidance in five-axis machining of a freeform surface. To avoid collision and rear gouging, a virtual enveloping element is proposed that is derived from the properties of the local and global surfaces. The set of tool orientations can be found first by confining the cutting tool within the virtual enveloping element. Then, the principal induced normal curvatures between the freeform surface and the cutting tool need to be evaluated to offer the criterion of gouging detection. To achieve the best combination of scallop height and machining efficiency, the contact length is also calculated for various tool orientations. The toolpaths generated by the proposed method are verified through solid cutting simulation and a trial cut on a five-axis machine.

Curvature Estimation for Metrology of Non-Rigid Parts

2013 ◽  
Author(s):  
Ali Aidibe ◽  
Souheil-Antoine Tahan
Keyword(s):  
Residual Stresses ◽  
Manufacturing Process ◽  
Computer Aided Design ◽  
Cad Model ◽  
New Approach ◽  
Profile Deviation ◽  
Defect Area ◽  
Computer Aided ◽  
Curvature Estimation ◽  
Aided Design

At the end of the manufacturing process, engineers need to know if a manufactured part fits its computer-aided design (CAD) model and how is the amplitude of inherent variation of manufacturing process. Non-rigid parts, at free state condition, may have a significant different form than their CAD model due to gravity loads; residual stresses induced distortion and/or assembly load. Today, a complicated and expensive specialized fixture is needed to conform these parts. To tackle the above challenges, we present in this paper a new approach for metrology of fixtureless non-rigid parts. This approach combines the curvature properties of manufactured parts with the extreme value statistic test as identification method to distinguish profile deviation due to the manufacturing process from part’s deformation due to the flexibility of the part and to determine whether the tolerance fits the CAD model or no. This approach is tested on simulated typical industrial sheet metal giving satisfying results in terms of percentage of errors in defect area and in peak profile deviation estimated.

Automatic Determination of Feature Interactions in Design-for-Manufacturing Analysis

1995 ◽  
Vol 117 (1) ◽  
pp. 2-9 ◽  
Author(s):  
R. Gadh ◽  
F. B. Prinz
Keyword(s):  
Computer Aided Design ◽  
Boundary Representation ◽  
Abstract Entity ◽  
Automatic Determination ◽  
New Approach ◽  
Feature Interactions ◽  
Definition Of ◽  
High Level ◽  
Aided Design

The current paper discusses a fundamentally new approach to defining and finding interactions in computer-aided design (CAD) forms or features. Feature classes are defined using a high-level abstract entity called a loop. Loops define features in a general manner and aid in the definition of feature boundaries as well. Interactions between features exist due to interactions between their boundaries. Several types of interactions are defined and automatically determined from the boundary representation solid model of the part subsequent to performing feature extraction.

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