SU1282966A2 - Dynamic vibration damper - Google Patents

Abstract

The invention relates to the machining of small stiffness parts using vibration damping devices. The aim of the invention is to increase the resource and reliability of the device in operation. The vibration damper is a bracket 2 mounted on the tool holder 1, on the axis of which 3 the lever 4 is rotatably mounted and fixed, carrying the system of rollers 5, 8 15 and the roller 18 which interact with the workpiece, which are connected with the electromagnet 21. In this case, the rollers 15 and 18 are mounted in the housing 10, having the possibility of elastic mixing. The invention is an improvement of the invention according to the author. St. No. 1166899. 3 Il.

Description

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The invention relates to metal cutting and can be used in the processing of parts of low rigidity, mainly on machine tools using automatic control systems.

The purpose of the invention is to increase the resource and reliability of the device by reducing the frictional wear of the thrust roller.

FIG. 1 shows a vibration damper, a general view; in fig. 2 - the same, top view; in fig. 3 is a section A-A in FIG. one.

The vibration damper contains a bracket 2 mounted on the tool holder 1, on the axis 3 of which the lever 4 is mounted and can be rotated and fixed; and the rotating tongue 5. At the end of the lever 4 in the rack 6, the rotating tongue 8 is mounted on the axis 7. The axial grooves of the lever 4 are movable pins 9 with housings 10, spring-loaded springs 11. In housings 10 pins 9 are mounted for movement in the direction perpendicular to the axis of the lever 4, the axis 12 spring-loaded by springs 13. On the axis 12 rotatably on the bearing 14 is mounted roller 15 and with the possibility of independent rotation on the bearing 16, designed to interact with the part 17 additional roller 18 of a larger diameter than the diameter of the thrust roller 15. The pulley 5 and the pulley 8 are covered by a flexible cable 19, which contours the thrust roller 15 One end of the flexible cable 19 is fixed to the pulley 5, and the second is connected to the core 20 of the electromagnet 21 mounted on the toolholder 1. The angle of rotation of the pulley 5 when the supply voltage of the electromagnet 21 is turned off is limited by a spring holding the core 20 in the cat ke solenoid 21 (not shown).

Dynamic vibration damper works as follows.

Detail 17 is installed in the chuck of the machine and pressed the desired center. The drive of the main movement is turned on, the cutter 22 is guided to the detail 17 and adjusted to the size. The lever 4 vibration absorbers with the rollers 15 and 18 are installed in the brace 2 at the required angle V, depending on

the dimensions of the part 17 and the cutting conditions are fixed in this position. The cutter 22 is then informed of the movement of the work feed, the plunge is performed and the process

turning point. In this case, the roller 18 moves to the already machined surface of the part 17 and presses the spring force of the electromagnet 21 transmitted to the roller 18 through the roller 15, the axis 12 and the flexible cable 19. At the same time, the roller 18 rotates independently

from the roller 15, which significantly reduces the friction force between the roller 15 and the flexible cable 19 and the process of heating the cable 19. As the cutter 22 moves relative to the part 17, the program block signals

or a cutter displacement sensor with respect to a part (not shown), a voltage is applied to the winding of the electromagnet 21, and the core 20 is drawn into the coil, which leads to tension of the flexible cable 19 through the pins 5 and 8. The tension created

the cable 19 force acts through the roller 15, the axis 12 and the roller 18 on the part 17, thereby compressing the static deflections of the part.

At the same time the roller 18, mounted on the axis 12, spring-loaded springs 11

and 13, carries out the suppression of dynamic oscillations of the part 17, which together with the tension force of the cable 19, helps to reduce the static deflections of the part 17 and to reduce the oscillations in a wide range.

The use of the proposed vibration damper ensures a more reliable operation and accuracy of the tuning, since the heating of the cable and the wear of the roller from the frictional forces between their surfaces are eliminated, since the stop roller rotates independently of the additional roller interacting

with detail.

Claims (1)

Invention Formula Dynamic damper on auth. St. No. 1166899, characterized in that, in order to increase the resource and reliability in operation, an additional roller with a diameter greater than the diameter of the stop roller, designed to interact with the surface of the workpiece, is mounted on the axis of the thrust roller. .LhwwHjj srig.2 7 13 fig.Z