RU2264890C1 - Spindle apparatus - Google Patents

Abstract

FIELD: machine tool manufacture, possibly boring in parts openings having simple- or complex-contour in lengthwise section, particularly in horizontal-boring machine tools.

SUBSTANCE: tool spindle of spindle apparatus is in the form of two-arm lever whose one arm carries cutting tool. On end of second arm axle is mounted; said axle engages with groove inclined relative to axis of hollow spindle. Inclined groove is formed in tie rod kinematically joined with drive unit for axially moving it. Rocking axis of tool spindle is mounted near end of hollow spindle.

EFFECT: simplified design, compact arrangement of the whole machine tool.

4 dwg

Description

The proposed device relates to the field of machine tools and can be used for boring in the details of holes of simple and complex shapes in longitudinal section, in particular in horizontal boring machines when boring the holes of the hubs of railway wheels.

Known spindle devices of horizontal boring machines containing a retractable spindle located in a hollow spindle, and a face plate, coaxial spindle. So, in the invention by A.S. No. 386721, M. cl. In 23 In 39/00 of 06/07/71, the hollow spindle is placed on the rolling bearings located in the headstock housing. The plate has a rotation drive independent of the hollow spindle and is mounted on two angular contact bearings.

In the device by A.S. No. 452438, M. cl. On 23 B 39/00 of 04/12/73, the faceplate was mounted on its own spindle coaxially with the boring spindle and provided with a radial support. The faceplate spindle is provided with an axial support located in the front wall of the headstock housing.

As a prototype, a spindle device according to AS No. 1098679, M. cl. In 23 In 39/02 of 04/27/82, the specified device comprises a faceplate with a cover, by means of which the faceplate is mounted on a flange of a hollow spindle mounted in the head of a horizontal boring machine, which is radially movable along linear guides with a caliper with a tool spindle, which connected to a rotation drive through bevel gears. The device is equipped with a platform mounted in cylindrical guides made in the faceplate with the possibility of rotation around an axis perpendicular to the face of the faceplate and remote from its end face, the support with a tool spindle on the platform and the specified spindle are mounted for axial movement by means of pins connected pivotally connected to each other and placed with the possibility of rotation of the lever associated with the last leash connected to the spline sleeve intended for fixing in the spindle of the machine. A spline shaft with an additional bevel gear for moving the tool spindle with the machine spindle through the transfer link is located in the indicated sleeve with the possibility of movement.

The specified device has wide technological capabilities, but a significantly complicated design.

The objective of the invention is the creation of a compact spindle device of a horizontal boring machine, in which the radial feed mechanism is integrated inside the hollow spindle, thereby determining the compact layout of the entire special wheel mill.

The problem is solved by the proposed spindle device of a horizontal boring machine with a tool spindle located in a hollow spindle.

New in the device is that the tool spindle is made in the form of a two-shouldered lever, one shoulder of which carries a cutting tool, and at the end of the second there is an axis interacting with a groove inclined with respect to the axis of the hollow spindle. The inclined groove is made on a thrust kinematically connected with the drive of its axial movement, and the swing axis of the tool spindle is installed near the end face of the hollow spindle.

The essence of the invention is illustrated by drawings.

Figure 1 shows a General view of the device in section.

Figure 2 is a section aa in figure 1.

Figure 3 is a section bB in figure 1.

Figure 4 is a section bb in figure 1.

The proposed spindle device is implemented in a wheel-boring machine model KRS 2791, the project of which was developed by the engineering limited partnership "Complex - Center - UZTS, Kaluga and Company". The machine was manufactured at Ulyanovsk Heavy and Unique Machine Tools Plant OJSC.

The spindle device comprises a hollow spindle 1 (see figure 1) mounted on bearings 2 and 3 mounted in the housing of the slider 4 of a horizontal boring machine.

The hollow spindle 1 is kinematically connected with the drive of its rotation through the gear 5.

Inside the hollow spindle 1, a tool spindle 6 cinematically connected to it is cantilevered. For this, two yokes 7 are fixed on the front end of the hollow spindle 1 (see FIG. 2), in which the axles 9 are installed on the bearings 8, passing through the hole made in the tool spindle 6.

At the front end of the tool spindle 6 there is a conical hole for basing the boring blocks 10.

For clamping the boring block 10, a package of Belleville springs 11 is built into the tool spindle 6. Inside the hollow spindle 1, a pressing mechanism of the boring blocks 10 is installed, consisting of a hydraulic cylinder 12, a piston 13, a pipe with flanges 14, a pipe 15, a pusher 16, a spring 17.

Two yokes 18 are fixed at the rear end of the tool spindle 6 (see FIG. 3 and FIG. 4), in the holes of which an axis 20 is mounted on the bearings 19, passing through the hole in the tool spindle 6. The axis 20 has landing journals for the bearings 19 and the middle the part on which two flats are arranged diametrically to each other, having the ability to interact with the wedge surfaces of the swing mechanism 21 through bearings 22.

The swing mechanism 21 is a rod 23 with a drive of its reciprocating movement, bearing a groove formed by two wedges 24 and 25, mounted on the rod 23. The right end of the rod 23 is mounted in bearings 26.

The spring 17 is connected at one end to the pusher 16, and the other to the axis 20.

The thrust 23 is kinematically connected with the drive of its reciprocating movement 27.

The proposed device operates as follows.

Before processing, the boring block 10 is fixed in the tool spindle 6 using a packet of Belleville springs 11.

The rotation of the tool spindle 6 is transmitted from the drive through the gear 5, the hollow spindle 1, the yokes 7, the axis 9.

Rotating, the tool spindle 6 through the axis 20 with flats carries into rotation through the bearings 22, the wedges 24 and 25 thrust 23.

The radial feed drive of the tool spindle 6. The thrust 23 receives axial movement from the drive 27. The wedges 24 and 25, forming a groove, moving along the axis of the hollow spindle 1, due to their inclined surfaces, move the axis 20 through the bearings 22 in a vertical plane. Accordingly, the right end of the tool spindle 6 is displaced up or down depending on the direction of movement of the rod 23.

The tool spindle 6, working as a lever, rotates about the axis 9 when its right end is displaced in the vertical plane, the left end of the tool spindle 6 is displaced in the vertical plane, thereby providing a radial feed of the boring block 10.

The machine control system provides a recalculation of the radial feed of the boring block 10 depending on the axial movement of the rod 23.

To squeeze the boring block 10 from the conical bore of the tool spindle 6, pressure is applied to the cavity of the hydraulic cylinder 12. The piston 13, moving, acts on the pipe with flanges 14, then on the pipe 15 and on the pusher 16, which, compressing the disk cup springs 11, releases the boring block 10. When the pressure is removed, the plunger 16 and the pipes 15 and 14 return to their original position under the action of the spring 17.

Claims (1)

A spindle device for metal-cutting machines, for example, horizontal boring machines, with a tool spindle located in a hollow spindle, characterized in that the tool spindle is made in the form of a two-shouldered lever, one shoulder of which carries a cutting tool, and an axis interacting with an inclined axis is installed at the end of the second with respect to the axis of the hollow spindle with a groove, the inclined groove being made on a thrust kinematically connected with the drive of its axial movement, and the swing axis of the tool spindle is set approximately and the end face of the hollow spindle.

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