SU1646692A1 - Boring mandrel - Google Patents

Abstract

The invention relates to metal cutting and can be used for bore holes. The aim of the invention is to enhance the functionality of the mandrel by damping radial and torsional vibrations. A sleeve with a vibration damper is installed in the opening of the housing 1, which is supported on the supports 7 in the housing 1. by rocking the liner 3 on the supports 7 and the impact of the walls of the grooves with the screws 13, 2 or more.

Description

Aa

No

15

I

2

O5 05 kD

to

FIG. 2

The invention relates to metal cutting and can be used for bore holes.

The aim of the invention is to expand the functionality of the mandrel due to the gap of both radial and torsional vibrations.

FIG. 1 shows a boring bar in which a vibration damper is integrated; in fig. 2 is a section A-A in FIG. one.

The case 1 of the boring mandrel with the multi-blade cutting tool 2 fixed on it has a blind axial hole,

In the hole with a gap D (there is a vibration damper consisting of a hollow sleeve 3, a row of weights 4, a spring 5 and a plug 6. Between the weights 4 and the sleeve 3 there is a gap providing shock loads 4 against the walls of the sleeve Zo Spring 5 serves for constant compression cargo 4 and create friction between the goods 4, which contributes to the loss of vibrational energy to overcome this friction.

The plug 6 acts as a cover and an emphasis for the spring 5 on the side of the weights 4, as well as a support on the side of the ball 7, as in the plug 6 there is a conical surface in contact with the ball 7. On the opposite side, the sleeve 3 rests on the other ball 7. The threaded stop 8 contacts its conical surface with the ball 7. This serves to create a gapless connection of the vibration damper with the balls 7 in order to transfer the effect of the vibration damper to the housing 1.

In order for the thread stop 8 not to twist out during the cutting process and consequently no gaps with balls 7 arise, it stops the screw 9 through the gasket 10 of soft material that serves to protect the thread on the thread stop 8. Support the sleeve 3 on the wigs 7, centrally rotated bores of the mandrel, and clearance D (provide a slight rotation of the vibration damper when torsional vibrations occur, which, in turn, leads to more effective vibration damping due to shocks. Two tangential pairs are made in the case of 1 l grooves in which two half-psex screws 11 with a spring 12 are screwed

five

,

five

0

ds

0

35

40

50

55

in their cavities, while the screws 11 are designed to regulate the force and the selection of the most appropriate force for effective damping of torsional vibrations.

Yat for providing blows to the hollow sleeve 3 in order to change the intensity of the blows, a gap D is provided, which is regulated by two stop screws 13 installed in the housing 1.

The locking screws 14 and 15 secure the screws 11 and 13, thereby maintaining the constancy of setting the parameters of the external damper: clearance D and spring amplifier 12

The springs 12 and screws 13 are in contact with z by the sleeve .3 in the tangential direction, i.e. The contact areas of the liner 3 with the springs 12 and the ning-tmi 13 are perpendicular to the direction of the velocity of movement of these areas during crushing vibration. When this bridge contact of the spring 12 and screw 13 with the sleeve 3 should be as far as possible structurally distant from the center. the rotation of the boring rod, as with an increase in the radius of the application of force increases the intensity of the moment created by honoring. This, in turn, is more important for more effective torsional vibrations.

Emerging grids machining nzgibnye fluctuations gaop. due to the frictional energy loss between loads 4, blows of loads 4 about hollow lip 3 due to the presence of a gap D2 between loads 4 and the internal opening of the hollow sleeve 3, and the oscillation frequency is changed by adding the natural oscillations of loads 4, body 1 and the whole system of AIDS (mills, fixture, tool, detail).

Claims (1)

The torsional vibrations are extinguished due to energy losses due to friction between loads 4, friction between balls 7 and threads 8 and body 1, as well as deformation of spring 12, and hitting screws 13 due to the gap Te between the ends of the screws 13 and the pads on the full of the sleeve 3 Formula and C o C p r e ri and Boring mandrel, peking core - lid with lid. and Fri. which has been set up by the project and Ih i spruce, states from a set of discs springed in the axial direction, characterized in that C | In order to expand the functional possibilities by damping both radial and torsional vibrations, the mandrel is equipped with ball bearings placed along the axis of the housing, with a sleeve with two pairs of grooves tangentially located on the outer surface, and Googna wild with another, and two pairs of pin-top, installed in these grooves, while the external damper is placed inside the sleeve, which is installed with the possibility of its ends interacting with the said supports, and the screws of one pair are made hollow to install the springs that are inserted into the mandrel and designed to interact with adjacent groove walls.,