RU2012448C1 - Device for direction of boring bar - Google Patents

Abstract

FIELD: attachments at treatment of deep holes. SUBSTANCE: the device for direction of boring bar consists of housing 1 accommodating tailstock sleeve 2 with jig bush 3 for direction of tool 4. The housing also accommodates sleeve 5, where bush 7 is installed in bearings, bush 7 has a set of engageable split rings 8 with male cones made on the end faces, and rings 9 with female cones; rings 9 are fitted in bush 7 without any clearance, and the rings envelop the boring bar without any clearance. Seal ring 1 also installed in the bush. To provide an accurate alignment of boring bar 10, rings 8, 9 are installed with their splits staggered in bush 7. EFFECT: facilitated procedure. 2 cl, 3 dwg

Description

 The invention relates to machine tools, in particular to tooling, is used to guide boring, for example, when processing deep holes.

 A device for guiding a tool and boring bar is known, consisting of a body, a sleeve for centering and guiding the tool is mounted on the left side of the tool, and a sleeve for centering and guiding the boring bar is installed on the right side of the body.

 In the bushings, internal longitudinal grooves are made, in which pads are mounted that interact with the wedges and with the possibility of axial movement from the spring, which provides a clearance-free direction of the boring bar.

 The disadvantage of this device design is its difficulty in manufacturing and the inability to accurately center and guide the boring bar due to deviation from the nominal length and angular dimensions in the manufacture of pads, wedges and internal longitudinal grooves in the sleeve.

 In addition, the disadvantage of this device is that during the processing of a deep hole it is impossible to change the rigidity of centering of the boring bar, the need for which is caused by a change in the frequency of natural vibrations of the boring bar depending on the length of the run.

 The development objective was to create a device that allows to increase the accuracy of processing and to provide damping of forced vibrations of the boring bar that occur during processing.

 The essence of the invention lies in the fact that in a device consisting of a housing in which a sleeve is installed with elements gaplessly centering the boring bar, a distinctive feature is the implementation of the centering elements in the form of a set of interacting split rings, screwed by a nut through the elastic element, at the ends of which conical surfaces are made, moreover for rings installed in the bore of the sleeve, the taper angle of the surfaces is directed to the axis of the boring bar, and for rings with alternating rings covering the boring bar, conicity directed in the direction opposite the location of the boring bar axis, thus at extreme rings mounted in the sleeve hole, formed conical at one end. The rings in the device are installed with their cuts in a checkerboard pattern.

 The new technical solution of the device for guiding the boring bar allows the boring bar to be centered more accurately and without gaps, since with this device design deviations on the long and angular parameters of the split rings do not affect the accuracy of centering of the boring bar, and it makes it possible to control the effort to compress the split rings by means of a nut while ensuring damping of vibrations depending on the size of the boring bar.

 In FIG. 1 shows a device, a General view; in FIG. 2 is a sectional view of the device AA in FIG. 1; in FIG. 3 is a sectional view of device BB in FIG. 1.

 A device for guiding the boring bar consists of a housing 1, on the left side of which a pin 2 is installed with a conductive sleeve 3 for guiding the tool 4.

 A sleeve 5 is installed on the right side of the housing, where a sleeve 7 is installed on two bearings 6. A set of interacting split rings 8 is installed in the sleeve 7 with outer cones made at the ends and rings 9 with inner cones. Split rings 9 with inner cones are gaplessly mounted in sleeve 7, and rings 8 with outer cones gaplessly surround boring bar 10. In addition, an additional ring 11 is installed in sleeve 7 made of an elastic material, for example, polyurethane or oil-resistant rubber.

On the extreme rings 12 installed in the sleeve 7, the cones are made on only one end facing the inside of the set. To ensure more accurate centering of the boring bar 10, split rings 8, 9 are installed in the sleeve 7 with their cuts 13 in a checkerboard pattern, for example, through 90 ^about . The stiffness of the base boring bar 10 in the device depends on the force of compression of the split rings 8, 9 and 12 through the ring 11 by means of a nut 14.

 The proposed device operates as follows.

 The guide post of the machine 15, together with the device for guiding the boring bar fixed in it, is led to the workpiece and sealed at the end with a sealing ring 16. The tool 4 is guided along the conductor sleeve 3, and the boring bar 10 is guided through the split rings 8. Through the nozzle 17, coolant is supplied under pressure. To prevent coolant leakage between the sleeve 5 and the sleeve 7, a labyrinth seal 18 is installed, and to prevent coolant leakage between the boring bar 10 and the sleeve 7, a set of split rings 9, 8 and 12 and the sealing ring 11 play the role of the seal.

 In the process of processing deep holes, the length of the extension of the boring bar is constantly changing and, depending on this, the frequency of natural vibrations of the boring bar also changes. At some intervals of the extension length of the boring bar, the frequency of natural vibrations of the boring bar coincides with the frequency of forced vibrations, which also varies with the degree of blunting of the cutting elements. The coincidence of the oscillation frequencies of the forced and intrinsic leads to the formation of a cut on the hole being machined, a breakdown of the tool and a decrease in productivity. In the proposed device, the elimination of oscillations of the boring bar is carried out by nut 14, with which you can change the stiffness of the centering of the boring bar. When tightening or loosening the nut 14, the split rings 8 and 9 wedge the boring bar in the sleeve 7 with a different force, which prevents the oscillation of the boring bar. The conical surfaces made at the ends of the rings 8, 9 and 12, when the boring bars oscillate, move between themselves and damp the vibrations due to friction.

Claims (2)

 1. DEVICE FOR DIRECTING THE BORING BAR, in the case of which a sleeve is installed with elements designed to center the boring bar, characterized in that the elements for centering the boring bar are made in the form of a set of split rings, an elastic element designed to interact with the extreme ring mounted on the side opposite the placement of the tool, and a nut installed with the possibility of interaction with the elastic element, and the rings are installed with the possibility of interaction with each other by means of nose surfaces that are made at their ends, while one of the rings is installed with the possibility of interaction with the inner surface of the sleeve and the taper angle of their end surfaces is directed to the axis of the boring bar, and other rings are installed with the possibility of interaction with the boring bar and the taper angle of their end surfaces is directed to the side opposite to the location of the axis of the boring bar, and at the extreme rings installed with the possibility of interaction with the inner surface of the sleeve, the conical surfaces are made on one end.  2. The device according to p. 1, characterized in that the rings are installed along the axis of the boring bar with the location of the cuts relative to each other in a checkerboard pattern.

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