AGMA 02FTM2-2002 pdf free

08-12-2021 comment

AGMA 02FTM2-2002 pdf free.Development and Application of Computer-Aided Design and Tooth Contact Analysis of Spiral-Type Gears with Cylindrical Worms.
The first and the major analysis of gearwheel tooth geometry is also performed at this stage
— the presence of tooth undercut and other types of interference, the presence of tooth wedging out at tooth point, the value of the transient area at tooth root.
The final step of the first stage is the definition of important performance characteristics of the gear for ideal gearing — forces, efficiency, and load capacity — the allowable value of loading torque.
Basically, the first stage completes the design of an ideal gear. Iterations here are concerned with such selection of gear parameters that it is realizable and its evaluation characteristics correspond to the initial task of the design.
In a number of cases this stage is enough to regard the gear designed and to start its manufacture, testing and application. The following stages give more complete representation of the gear, adjust it to real capabilities of manufacture and loading.
2.2. The task of manufacture synthesis (Fig. 4) has two statements:
a) to calculate cutting tool parameters, their position and motion when processing (let’s call these parameters “setting parameters) — when the ideal conjugate flanks are generated;
b) to choose setting parameters, providing such surface modification that the desired tooth contact and the given sensitivity of the gear to different errors and deformations could be achieved.
For the first statement the task is in many respects implemented even at the stage of synthesis of ideal conjugate gearing (the first of the pointed above stages), since setting parameters for gearwheel tooth processing repeat in principle the analogous parameters for the gearing of worm and gearwheel. In this case at the stage of manufacturing synthesis the hob imitating the worm or another cutting tool is designed, for instance, the fly cutter with the edges repeating the screw surface of the worm.
The initial requirements to solve the task of manufacturing synthesis within the second statement may be: given position. shape and dimensions of the contact pattern or the instant contact area at the chosen gearing phase. The value of the necessary profile and longitudinal modification of gearwheel teeth (worm threads) may also be assigned here. These requirements are possible to be met by modifying both the worm thread surface (as it is done in [13]) and the gearwheel flanks [14, 15]. As a rule, the value of contact pattern localization can be controlled by changing the relation of profile curvatures of the worm and cutting tool. The necessary modification in longitudinal direction of gearwheel teeth (worm threads) may be achieved by introducing the difference between the shape of pitch surfaces of the worm and cutting tool: for example, by applying the worm with cylindrical (bevel) pitch surface and cutting tool with globoid one, or otherwise, the worm should be barrel-shaped and the cutting tool — cylindrical (bevel). The rest setting parameters here remain identical to corresponding parameters of the ideal conjugate gearing. In general case, however, all the setting parameters may be changed, namely: the distance and angle between axes of the cutting tool and the gearwheel, pitch, diameter and profile angles of the cutting tool. gear ratio and processing feed.
The criterion of the correct choice of setting parameters is always the fulfillment of all the pointed above initial requirements, their specific implementation are dimensions and location of contact ellipse, calculated according to the reduced radii of flank curvatures, and the values of modifications both in the vicinity of the given calculated point and for the whole modified flank.
2.3. The task of deformation mode evaluation (Fig.5) also consists of two parts: solution of the task for: a) gearing elements and b) for the rest gear elements — hubs, shafts, bearings, housing parts. Evidently, the initial data to implement this stage are, first, the results obtained at previous stages, particularly, forces, acting in the gearing under the given loading torque (the first stage), tooth geometry (the first and the second stages) and geometrical characteristics of gearing (the first stage) and, second, the information concerning the gear design. The basic results of this task solution are a) evaluation of strength characteristics of the gearing (the first strength evaluation is given at the first stage when calculating the load capacity of the gear); b) deformation field.AGMA 02FTM2 pdf download.

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