File Name: gear materials properties and manufacture .zip
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
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.
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. Thermal refined and induction hardened. Used in gear manufacturing, except for worm gear.
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. A gear may also be known informally as a cog. Geared devices can change the speed, torque, and direction of a power source. Gears of different sizes produce a change in torque, creating a mechanical advantage , through their gear ratio , and thus may be considered a simple machine.
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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.
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