File Name: gear materials properties and manufacture .zip
A gear is a rotating circular machine part having cut teeth or, in the case of a cogwheel or gearwheel , inserted teeth called cogs , which mesh with another toothed part to transmit torque.
Gear manufacturing refers to the making of gears. Gears can be manufactured by a variety of processes, including casting , forging , extrusion , powder metallurgy , and blanking. As a general rule, however, machining is applied to achieve the final dimensions, shape and surface finish in the gear.
The initial operations that produce a semifinishing part ready for gear machining as referred to as blanking operations; the starting product in gear machining is called a gear blank. The gear material should have the following properties: . There are multiple ways in which gear blanks can be shaped through the cutting and finishing processes. In gear form cutting, the cutting edge of the cutting tool has a shape identical with the shape of the space between the gear teeth.
Two machining operations, milling and broaching can be employed to form cut gear teeth. In form milling , the cutter called a form cutter travels axially along the length of the gear tooth at the appropriate depth to produce the gear tooth.
After each tooth is cut, the cutter is withdrawn, the gear blank is rotated, and the cutter proceeds to cut another tooth. The process continues until all teeth are cut. Broaching can also be used to produce gear teeth and is particularly applicable to internal teeth. The process is rapid and produces fine surface finish with high dimensional accuracy. However, because broaches are expensive and a separate broach is required for each size of gear, this method is suitable mainly for high-quality production.
In gear generation, the tooth flanks are obtained as an outline of the subsequent positions of the cutter, which resembles in shape the mating gear in the gear pair.
There are two machining processes employed shaping and milling. There are several modifications of these processes for different cutting tool used. Gear hobbing is a machining process in which gear teeth are progressively generated by a series of cuts with a helical cutting tool. All motions in hobbing are rotary, and the hob and gear blank rotate continuously as in two gears meshing until all teeth are cut..
As produced by any of the process described, the surface finish and dimensional accuracy may not be accurate enough for certain applications.
Several finishing operations are available, including the conventional process of shaving, and a number of abrasive operations, including grinding , honing , and lapping. This article about a mechanical engineering topic is a stub. You can help Wikipedia by expanding it.
From Wikipedia, the free encyclopedia. Spur gear systems Worm drive Rack and pinion Epicyclic planetary gearing Sun and planet gear Harmonic drive Cycloidal drive Non-circular gear. Involute Cycloid. Cogset Derailleur gears Hub gear Shaft-driven bicycle Sprocket. Wheel train. Categories : Gears Mechanical engineering stubs. Hidden categories: All stub articles. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version.
Gear manufacturing refers to the making of gears. Gears can be manufactured by a variety of processes, including casting , forging , extrusion , powder metallurgy , and blanking. As a general rule, however, machining is applied to achieve the final dimensions, shape and surface finish in the gear. The initial operations that produce a semifinishing part ready for gear machining as referred to as blanking operations; the starting product in gear machining is called a gear blank. The gear material should have the following properties: . There are multiple ways in which gear blanks can be shaped through the cutting and finishing processes.
The paper is focused on the influence of gearing material and thermal or chemical-thermal processing of wheels on the results of the strength calculation carried out in accordance to the standard, in particular on the safety factor. This effect is examined on a gearbox that was part of the steel coil production line in the integrated steel plant. Due to changes in production, the load on the gears increased. Thus, the result of this work is the selection of new materials for the two-speed gearbox and their heat treatment to meet the safety conditions of the gearing mechanism without changing the geometrical parameters of the gearbox. Download to read the full article text. Liu et al. Tobie, F.
When it comes to large scale production, gear engineering and design is crucial. In our experience, at a simplified level, there are three factors that are most important when selecting a gear material. They are strength, durability, and cost, which includes both the cost of the material and the cost of manufacturing. While the importance of these factors may vary from one project to another, the key to material selection is finding the right combination of physical properties that satisfy the requirements of the project at the lowest cost. Gears can be made of all sorts of materials, including many types of steel, brass, bronze, cast iron, ductile iron, aluminum, powdered metals, and plastics. Steel is often most desirable because it offers a winning combination of high strength-to-weight ratio, high resistance to wear, the ability to enhance the physical properties through heat treatment, and competitive pricing. For custom gear design, we recommend working with an experienced gear manufacturer with an in-house gear engineering and design team.
Embed Size px x x x x All Rights Reserved. Gear Materials, Properties, and Manufacture G. No part of this book may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means,electronic, mechanical, photocopying, recording, or otherwise, without the written permission of the copyrightowner.
A polymer gear plastic gear — is a wheel with teeth on its surface designed to mesh with another gear or rack and manufactured by machining or an injection molding process from any engineering thermoplastic polymer. Polymer materials are widely employed in drives of machines and mechanisms owing to their advantages over metals: high specific mechanical properties and tribological performance, self-lubrication, high resistance to impact loading and its damping, resistance to oils and chemicals, high size-weight ratio, high production rates in case of mass production, and high safety. Thermoplastic gears find application in precision instruments, office appliances, service and mechatronic devices, household facilities, computer and laboratory equipment, etc. Mean average specific indices of strength and deformability of plastics and metals. Surface fatigue stress versus number of load cycles Walton and Shi The range for application of plastic gears is quite wide. They can operate in drives much differing from each other, e.
Polyamide worm gear: manufacturing and performance. The focus of this paper is to establish a characterisation method for seven polyamide PA grades to determine the major material to manufacture an automotive worm gear. The composite properties were measured according to the worm gear loadings: tensile strength, Young's modulus, abrasion and impact resistance.
In accordance to their usage, gears are made of various types of materials, such as iron-based materials, nonferrous metals, or plastic materials. The strength of gears differs depending on the type of material, heat treatment or quenching applied. High hardness obtained by Carburizing.
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Gear materials, properties, and manufacture / edited by J.R. Davis p. cm. This publication is being made available in PDF format as a benefit to members and.Reply