RU2768617C1 - Metal cutting machine for wheel hub bore processing - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly, to boring machines intended for machining the hub bore of solid-rolled railway wheels during the formation and repair of wheel sets of rolling stock of railways. Machine comprises a box-shaped bed, in the center of which there are guides, a slider fixed on the guides, a spindle, as well as a device for fixing the processed wheel, consisting of an end clamping mechanism made in the form of three plungers, and a centering device consisting of a ring with three wedges fixed on it, located from each other at angle of 120°, as well as three centering cams, three clamping and deflecting rollers.

EFFECT: increase in the convenience of basing and the reliability of fixing the processed wheel in the clamping device and, as a result, an increase in the accuracy of processing.

1 cl, 3 dwg

Description

The invention relates to the field of machine tools, in particular to boring machines for processing holes in the hub of solid-rolled railway wheels in the formation and repair of wheelsets of rolling stock of railways.

Known self-centering carousel chuck described in the utility model patent of the Russian Federation No. 30298 (MPK V23V 31/10, dated 05.02.2003.), containing a body with a centering mechanism installed on it, a wheel end-based device mounted on the bottom plate of the body, a centering mechanism made in the form of three sliders located on the bottom plate of the housing between self-aligning supports, while the sliders are mounted with the possibility of synchronously moving them to the center of rotation of the cartridge by means of a movement mechanism, which is connected to the ends of the sliders through a rotary bar, and clamping jaws are installed at opposite ends of the sliders, the mechanism movement is made in the form of a screw.

Known self-centering chuck described in the utility model patent of the Russian Federation No. 14157 (MPK V23V 31/26, dated 10.01.2000.), containing a housing, a wheel, crawlers, cams and a rotation drive, a locking mechanism made in the form of an eccentric shaft, consisting of two cylindrical parts, one of which is placed in the body, and the other is installed with the possibility of contact with the wheel groove and the gap selection mechanism, made in the form of a screw, installed in the threaded hole of the crawler and connected to the body by means of a strap.

The disadvantage of these devices is the lack of a system for clamping the workpiece to the end base surface, which leads to the uncertainty of the basing in the process of final fixing of the workpiece and thus to a decrease in the basing accuracy.

The closest analogue is a metal-cutting machine for machining a wheel hub hole, described in the utility model patent of the Russian Federation No. 35268 (MPK V23V 41/00, V23V 39/02, dated 25.19. containing a frame, a drive for the relative rotation of the tool and the machined wheel, drives for axial and radial tool feeds, a slide bearing a rotating spindle with a boring bar and a cutting tool, mounted on the frame with the possibility of axial movement along its guides, the machined wheel fixedly mounted in a fixture fixed at the end of the frame for fastening the wheel being machined, and the machined wheel and the spindle are coaxial.

The disadvantage of this device is that the specified metal-cutting machine does not provide convenient basing and secure fastening of the machined wheel in the fixture.

The technical result, to which the claimed invention is directed, is to increase the convenience of basing and the reliability of fixing the workpiece in the clamping device and, as a result, to increase the accuracy of processing.

The specified technical result is achieved due to the fact that the metal-cutting machine for processing the hole of the wheel hub contains a box-shaped frame, in the center of which there are guides, a slider fixed on the guides, a spindle, as well as a device for fastening the wheel being machined, consisting of a mechanical a clamp made in the form of three plungers, and a centering device consisting of a ring with three wedges fixed on it, located from each other at an angle of 120°, as well as three centering cams, three clamping and squeezing rollers.

In FIG. 1 shows a general view of the machine, where:

1 - bed;

2 - bracket;

3 - fixture;

4 - guides;

5 - slider;

6 - spindle;

7 - processed wheel;

8 - basing ring;

9 - sensor for measuring the inner end of the processed wheel;

10 - chip collector;

11 - sensor for measuring the outer end of the wheel being machined.

In FIG. 2 shows the front view, where:

12 - centering cam;

13 - clamping roller;

14 - outlet roller;

15 - wedge;

16 - ring;

17 - hydraulic cylinder for turning the ring;

19 - end clamp plunger;

22 - adjusting pin.

In FIG. 3 shows section B-B, where:

7 - processed wheel;

12 - centering cam;

13 - clamping roller;

15 - wedge;

16 - ring;

18 - plate;

19 - end clamp plunger;

20 - end clamp wedge;

21 - end clamp hydraulic cylinder.

The machine tool contains a box-shaped frame 1, on the upper surface of which two brackets 2 are fixed for fastening the fixture body 3. In the central part of the frame 1, an opening is made with guides 4 along which the slider 5 moves, equipped with a spindle 6 with a cutting tool. At the front end of the bed 1 there is a locating ring 8, concentric with the axis of the spindle 6.

Device 3 is a mechanism for fixing the wheel being machined and includes a movable ring 16 with three wedges 15 fixed on it, located relative to each other at an angle of 120°, an end clamp mechanism made in the form of three plungers 19 and a centering device consisting of centering cams 12, clamping rollers 13 and withdrawal rollers 14. At the front end of the device there are two pins 20 used to install the wheel in the machine.

The cutting zone is closed by a chip collector 10 to protect the operator from flying chips and to collect and direct the chips into a receiving container or conveyor. The chip collector 10 can be rotated 180° to enable the installation and removal of the work wheel.

Inside the fixture there is a measuring device with a sensor for measuring the inner end of the wheel being machined 9, and on the chip collector 10 there is a sensor for measuring the outer end 11 before processing.

In the initial position, the chip collector 10 is in the retracted position, and the centering cams 12 are separated. To fix the machined wheel 7 inside the fixture 3, it is installed on two pins 22, with the help of two hydraulic cylinders 17, the ring 16 rotates, while the wedges 15 through the clamping rollers 13 act on the centering cams 12, synchronously moving them towards the central axis of the machine, thereby centering the machined wheel. End-based wheel is carried out by three plungers 19, which, under the influence of hydraulic cylinders 21 through wedges 20, move perpendicular to the end surface of the wheel being machined, pressing the workpiece against the plates 18 located on the inner edges of the centering cams 12. After processing, the plungers of the end clamp 19 return to their original position with the help of springs , and the ring 15 under the influence of the hydraulic cylinders 17 rotates in the opposite direction, while the wedges 15 spread the centering cams 12 through the outlet rollers 14. The chip collector 10 is also retracted, freeing the cutting zone to change the machined wheel.

Thus, the proposed metal-cutting machine provides an increase in the accuracy of processing, convenient basing and reliable fastening of the machined wheel in the fixture.

Claims (2)

1. A metal-cutting machine for processing a wheel hub hole, containing a box-shaped frame, in the center of which there are guides, a slider fixed on the guides, a spindle and a device for fixing the wheel being machined, characterized in that the device for fixing the wheel being machined contains an end clamp mechanism, made in the form of three plungers, and a centering device consisting of a movable ring with three wedges fixed on it, located at an angle of 120° from each other, three centering cams, three clamping and diverting rollers, while the wedges are made with the possibility of acting on the clamping and withdrawal rollers. 2. Metal-cutting machine according to claim 1, characterized in that the fixture for fixing the wheel being machined additionally contains a measuring device with a non-contact sensor for measuring the inner end of the machined wheel and a chip collector with a sensor for measuring the outer end of the machined wheel.

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