SU1234054A1 - Carriage-mounted boring head - Google Patents

Description

ten

15

20

I1234054

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

The purpose of the invention is to simplify the design of the head by reducing the number of kinematic connections.

FIG. 1 shows the proposed head, a general view; in fig. 2 is a view A of FIG. one.

The boring head consists of a stationary body 1, fixed on the headstock 2, and a rotating caliper 3. In the lower part of the body 1, the guides 4 and 5 are made in contact with the counter guides 6 and

7 slider 8. In slider 8 there is a hole, the center of which in the initial position coincides with the axis of spindle 9. Slider 8 is moved by means of screw 10 fixed in fixed part of housing 1 and nut 11 fixed on slider 8.

Opposite the screw 10 in the case of the housing is a spring 12, designed to sample the gap in the screw connection 10-11. This spring always presses the nut I1 to the side of the thread of the screw 10, which takes the load from the cutting forces and the frictional forces when moving the slider

8B, for example, 4 and 5.

The rotary support 3 is mounted on bearings 13 and) 4 inside the housing 1, coaxial with the spindle 9 and connected. with a rigid clutch 15.

In the guide sleeves 16, a gear rack 17 is mounted, at one end of which a roller 18 is attached, which is in force contact with the inner bearing surface. The holes of the slider 8 are fixed by means of a spring 19. A freewheel is installed inside the rotating part of the housing; which is fitted with a toothed thread engaging with the toothed rack 17, and is seated on the free-running bushing of the freewheel 21 with the rollers 22, sprocket 23 and springs 24.

The sprocket 23 is stationary on a drive shaft 25 mounted in bearings 26 and 27. At the lower end of shaft 25, a bevel gear 28 is mounted, engaging with two bevel wheels 29 and 30, freely fitting on a code screw 31 mounted in bearings 32 34 and connecting without a gap {mechanism

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thirty

35

40

45

0

the choice of the gap is not shown) with a nut 35 mounted on the carriage 36 moving in the directions of the rotating part of the body carrying the tool holder 37 ..

To change the direction of the radial feed of the tool with the same direction of rotation, the spindles are provided bilaterally to: the Ulach coupling 38, fitted on the spline side of the lead screw 31 and switched manually when adjusting the head. For manual movement of the carriage 36, square 39 is provided on the spindle 31. A safety coupling 40 is used to prevent the cutter from breaking down after it reaches a predetermined amount of movement.

The rotation of the screws 10 and 31 can occur from individual drives.

The plansupport boring head works as follows.

The spindle 9 rotates, which, through the sleeve 15, rotates the rotating support 3 clockwise, while the slider 8 is in the initial position, at which its bore axis coincides with the axis of the rotating support 3, and the BW carriage by rotating the square 39 of the driving screw 31 adjusted to the desired size.

The axial movement of the headstock 2 is performed by boring holes or turning external surfaces. In this case, the roller 18 is wrapped around the supporting surface B of the holes of the slider 8, the rail 17 is stationary in the axial direction and the radial feed does not occur. Spring 12, to counteract the movement of the slider 8, selects the gap in the threaded connection of the screw 10 with the nut 11.

By turning the screw 10, the slider 8 is displaced along the guides 4 and 5. In connection with the fact that the rotating caliper 3 and the slider 8 are eccentrically located, the roller 18, pushing away from the surface 0 of the hole of the slider 8, moves the rail 17 in the axial direction . The rail 17 moves in one revolution of the rotating part by an amount equal to twice the eccentricity E. When 5 is moved, the rail 17 turns counterclockwise the yoke 20, which with the help of friction forces and springs 24 seizes the rollers 22 and

0

five

0

five

using the sprocket 23, the freewheel 21, which turns the drive shaft 25, the gears 28 and 29 or 28 and 30, via the key, depending on how the cam clutch 38 is turned on. Then the rotation is transmitted from the screw 31 to the nut 35 and the tool carriage em radial feed.

In one revolution of the rotating caliper, the rail 17 makes one double stroke, in this case the feed takes place in the first half of the revolution, and in the second half of turns the rail 17 reverses under the action of the spring 19 and takes the initial position.

During the return stroke of the rail 17, the yoke 20 rotates clockwise and with the help of frictional forces, overcoming the force of the springs 24, wedges the roller 22 and freely rotates relative to the fixed sprocket 23. Then the head works as described.

When performing operations with radial tool feed, for example

544

when trimming end surfaces, grooving grooves, and other similar operations, it is necessary to establish the value of eccentricity E, on which the radial feed size per one turn of the spindle depends, determined by the formula:

2 E Z,

2 F

Where

D

g

-diameter dividing the circumference of the wheel (clip) 20;

The number of teeth, respectively, of bevel gears 28-30 () t is the spindle pin 31. The largest radial feed is observed at E cuKff; with, i.e. when the axis of the hole slider 8 and the axis of the rotating caliper 3 are the same.

The magnitude of the eccentricity is determined by turning, a screw 10, which moves the half-wheel 8 with the help of a nut 11. The movement is measured, for example, by a limb (not shown) or by another method.

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Compiled by S. Ber Editor A. Ogar Tehred L.Oleinik Proofreader S. Shekmar

Order 2933/12. Circulation 1001 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

PLANSUPPORT BORING HEAD, comprising a housing, a caliper, a carriage with a cutting tool and a threaded spindle kinematically connected with a radial drive of the tool, characterized in that; that, in order to simplify the design, the head is equipped with a slider with a hole and a freewheel with an asterisk, and the slider is mounted with the ability to move on guides that are made in the housing, and the freewheel is placed in the caliper and it has a gear cutting designed for interaction with a spring-loaded gear rack with a roller inserted into the head, the roller being designed to interact with the crawler hole, and the sprocket is kinematically connected to the running screw _{Q of the} carriage. '$ ω