РОЗШИРЕННЯ ТЕХНОЛОГІЧНИХ МОЖЛИВОСТЕЙ ДОПОМІЖНИХ ОПОР ВЕРСТАТНИХ ПРИСТРОЇВ

P. V. Kushnirov; A. V. Evtuhov; I. M. Dehtiarov; Yu. O. Denysenko; B. S. Basov

doi:10.32782/msnau.2023.1.7

P. V. Kushnirov https://orcid.org/0000-0001-5894-538X
A. V. Evtuhov https://orcid.org/0000-0001-9428-403X
I. M. Dehtiarov https://orcid.org/0000-0001-8535-987X
Yu. O. Denysenko https://orcid.org/0000-0002-9816-2862
B. S. Basov https://orcid.org/0000-0003-0954-6184

DOI: https://doi.org/10.32782/msnau.2023.1.7

Keywords: machine tool device, non‑rigid workpiece, auxiliary support, self‑installing support, underpinning support, support pin, angle of inclination, spherical base

Abstract

The article considers the problems of increasing rigidity when installing non‑rigid workpieces with large dimensions in terms of length or width in devices. Examples of such parts are various cases, plates, frames, tables of paper‑cutting machines, thin‑walled parts of aviation equipment, etc. Machine tools devices for setting workpieces contain main supports. To increase the rigidity of the technological system in machine tools devices, additional auxiliary supports are used. Two types of auxiliary supports are used – self‑installing and underpinning. These auxiliary supports contain a wedge with a bevel angle of up to 8 degrees to provide a self‑braking effect. The analysis of the existing types of auxiliary supports made it possible to identify the shortcomings of their constructive implementation and directions for improvement. It is shown that underpinning supports, in contrast to self‑installing ones, are more rigid and therefore more recommended. Auxiliary underpinning supports are brought to the workpiece manually. In order not to exceed the force of pressure on the wedge of the underpinning support, a compression spring is used, located in the blind hole of the wedge between the bottom of this hole and the support rod. For the installation of workpieces with curved support surfaces, it is recommended to use auxiliary underpinning supports of the rotary type. Such supports allow not only to change the angle of inclination of the support pin within 0–90 degrees, but also to rotate the support around its axis by an angle of 360 degrees. The proposed variant of the rotary auxiliary underpinning support also allows tilting to different angles. This becomes possible thanks to the spherical base of the support. The use of a spherical base in the structure of the support allows to simplify the support itself, to reduce the overall dimensions of the support and its weight while maintaining the ability to change the angle of inclination of the support pin in space in different directions. A comparison of the capabilities of the support pin of the considered auxiliary supports to perform linear movement or rotation in different directions in the three‑dimensional coordinate system was carried out. It was determined that the greatest number of possibilities for the movement of the support pin are provided by underpinning rotary auxiliary supports, the maximum possibilities are the proposed rotary auxiliary underpinning support with a spherical base. This indicates the presence of the greatest technological capabilities in this support, which makes it possible to use it to installation a wide range of workpieces with curved, inclined and hard‑to‑reach support surfaces.

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EXPANSION OF TECHNOLOGICAL CAPABILITIES OF AUXILIARY SUPPORTS OF MACHINE TOOLS DEVICES

Abstract

References