User's Manual for Tooth Contact Analysis of Face-Milled Spiral Bevel Gears with Given Machine-Tool Settings

User's Manual for Tooth Contact Analysis of Face-Milled Spiral Bevel Gears with Given Machine-Tool Settings
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Total Pages: 78
Release: 2018-07-17
Genre:
ISBN: 9781722860585

Research was performed to develop a computer program that will: (1) simulate the meshing and bearing contact for face milled spiral beval gears with given machine tool settings; and (2) to obtain the output, some of the data is required for hydrodynamic analysis. It is assumed that the machine tool settings and the blank data will be taken from the Gleason summaries. The theoretical aspects of the program are based on 'Local Synthesis and Tooth Contact Analysis of Face Mill Milled Spiral Bevel Gears'. The difference between the computer programs developed herein and the other one is as follows: (1) the mean contact point of tooth surfaces for gears with given machine tool settings must be determined iteratively, while parameters (H and V) are changed (H represents displacement along the pinion axis, V represents the gear displacement that is perpendicular to the plane drawn through the axes of the pinion and the gear of their initial positions), this means that when V differs from zero, the axis of the pionion and the gear are crossed but not intersected; (2) in addition to the regular output data (transmission errors and bearing contact), the new computer program provides information about the contacting force for each contact point and the sliding and the so-called rolling velocity. The following topics are covered: (1) instructions for the users as to how to insert the input data; (2) explanations regarding the output data; (3) numerical example; and (4) listing of the program. Litvin, Faydor L. and Zhang, YI and Chen, Jui-Sheng Unspecified Center...

Tooth Contact Analysis of Face-Milled Spiral Bevel Gears With Given Machine-Tool Settings (User's Manual).

Tooth Contact Analysis of Face-Milled Spiral Bevel Gears With Given Machine-Tool Settings (User's Manual).
Author: Faydor L. Litvin
Publisher:
Total Pages: 76
Release: 1991
Genre:
ISBN:

The main goal of this research project is to develop a computer program that will: (1) simulate the meshing and bearing contact for face-milled spiral bevel gears with given machine-tool settings, and (2) to obtain the output, some of the data is required for hydrodynamic analysis. It is assumed that the machine-tool settings and the blank data will be taken from the Gleason summaries. The theoretical aspects of the program are based on the theory that has been developed in the NASA Contractor Report 4342, AVSCOM Technical Report 90-C-028 entitled 'Local Synthesis and Tooth Contact Analysis of Face-Milled Spiral Bevel Gears', by Faydor L. Litvin and Yi Zhang. The difference between the computer programs developed in this report and the previous one is as follows: (1) the mean contact point of tooth surfaces for gears with given machine-tool settings must be determined iteratively, while two parameters (H and V) are changed. Parameter H represents the displacement along the pinion axis, and parameter V represents the gear displacement that is perpendicular to the plane drawn through the axes of the pinion and the gear of their initial positions. This means that when parameter V differs from zero, the axis of the pinion and the gear are crossed but not intersected. The method of local synthesis developed in the previous report provides conditions of exact contact of surfaces at the mean point. (2i) In addition to the regular output data (transmission errors and bearing contact), the new computer program provides information about the contacting force for each contact point, and the sliding and the so-called rolling velocity.

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Author:
Publisher:
Total Pages: 652
Release: 1994
Genre: Aeronautics
ISBN:

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Comparison of Experimental and Analytical Tooth Bending Stress of Aerospace Spiral Bevel Gears

Comparison of Experimental and Analytical Tooth Bending Stress of Aerospace Spiral Bevel Gears
Author:
Publisher:
Total Pages: 20
Release: 1999
Genre:
ISBN:

An experimental study to investigate the bending stress in aerospace-quality spiral bevel gears was performed. Tests were conducted in the NASA Lewis Spiral Bevel Gear Test Facility. Multiple teeth on the spiral bevel pinion were instrumented with strain gages and tests were conducted from static (slow roll) to 14400 RPM at power levels to 540kW (720 hp). Effects of changing speed and load on the bending stress were measured. Experimental results are compared to those found by three-dimensional finite element analysis.

Metal Cutting Theory and Practice

Metal Cutting Theory and Practice
Author: David A. Stephenson
Publisher: CRC Press
Total Pages: 947
Release: 2018-09-03
Genre: Technology & Engineering
ISBN: 1315362686

A Complete Reference Covering the Latest Technology in Metal Cutting Tools, Processes, and Equipment Metal Cutting Theory and Practice, Third Edition shapes the future of material removal in new and lasting ways. Centered on metallic work materials and traditional chip-forming cutting methods, the book provides a physical understanding of conventional and high-speed machining processes applied to metallic work pieces, and serves as a basis for effective process design and troubleshooting. This latest edition of a well-known reference highlights recent developments, covers the latest research results, and reflects current areas of emphasis in industrial practice. Based on the authors’ extensive automotive production experience, it covers several structural changes, and includes an extensive review of computer aided engineering (CAE) methods for process analysis and design. Providing updated material throughout, it offers insight and understanding to engineers looking to design, operate, troubleshoot, and improve high quality, cost effective metal cutting operations. The book contains extensive up-to-date references to both scientific and trade literature, and provides a description of error mapping and compensation strategies for CNC machines based on recently issued international standards, and includes chapters on cutting fluids and gear machining. The authors also offer updated information on tooling grades and practices for machining compacted graphite iron, nickel alloys, and other hard-to-machine materials, as well as a full description of minimum quantity lubrication systems, tooling, and processing practices. In addition, updated topics include machine tool types and structures, cutting tool materials and coatings, cutting mechanics and temperatures, process simulation and analysis, and tool wear from both chemical and mechanical viewpoints. Comprised of 17 chapters, this detailed study: Describes the common machining operations used to produce specific shapes or surface characteristics Contains conventional and advanced cutting tool technologies Explains the properties and characteristics of tools which influence tool design or selection Clarifies the physical mechanisms which lead to tool failure and identifies general strategies for reducing failure rates and increasing tool life Includes common machinability criteria, tests, and indices Breaks down the economics of machining operations Offers an overview of the engineering aspects of MQL machining Summarizes gear machining and finishing methods for common gear types, and more Metal Cutting Theory and Practice, Third Edition emphasizes the physical understanding and analysis for robust process design, troubleshooting, and improvement, and aids manufacturing engineering professionals, and engineering students in manufacturing engineering and machining processes programs.