Improving the Abrasive Finishing of Precision Components
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oving the Abrasive Finishing of Precision Components Yu. N. Vivdenkoa, *, A. E. Pushinaa, and Yu. I. Safronovaa aSiberian
State Automobile and Highway University, Omsk, Russia *e-mail: [email protected]
Received July 20, 2019; revised July 21, 2019; accepted July 23, 2019
Abstract—Analysis and experiments highlight the key features in the formation of the output parameters for centerless finishing of precision components in different manufacturing sectors. The data obtained may be used to increase the productivity and the surface quality of the machined surface on existing centerless-finishing systems. Keywords: precision components, abrasive finishing, ground surfaces, grinding surfaces, precision, surface roughness, centerless-grinding systems DOI: 10.3103/S1068798X20080225
Axial motion s of the product is ensured by adjusting the angle ϕ of roller separation and by the action of force Pb. As a result of force Pb (Fig. 1), we are dealing with concentrated compressive loads, and a system of local stresses acts. Those stresses are determined in contact problems. Solution of contact problems yields the following results [7–9]: (a) the shape and size of the contact area after deformation; (b) the stresses and stress distribution within the contact area; (c) the decrease in distance between the bodies at contact. At that point, it is possible to use the stress distribution to estimate the output parameters in finishing.
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Updating production equipment in the aviation, transportation, and energy sectors and elsewhere generally involves improving their performance. In turn, improving their performance is associated with stricter requirement on the precision and roughness of the machined surfaces [1–3]. Thus, precision parts in the fuel-control system of diesel and gas-turbine engines must correspond to precision class 3–1. Note that production systems monitoring product precision must be designed to higher precision than the products being monitored. Abrasive finishing may be used with such precision industrial components. In the production of machines and instruments, abrasive finishing is applied to working surfaces of different geometry, such as plane, cylindrical, or spherical (internal or external) surfaces [4–6]. Abrasive finishing on centerless machines is used for many components with external cylindrical surfaces. By means of examples, we now illustrate some characteristic problems of this process and outline means of improving the equipment employed. The outcome of centerless finishing may be improved by determining the kinematic, dynamic, and technological interaction of the ground and grinding surfaces. The forces involved in centerless finishing are shown in Fig. 1. The product 3 is pressed against the grinding rollers 1 and 2 by specified force Pb, which is applied by the pressure bar. The cast-iron rollers behave as laps. With specified errors and surface roughness, rotation of the rollers at speeds v1 and v2 and of the product at speed v3 yields the product with it
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