SU1212750A1 - Hydraulic follow-rest - Google Patents

Description

12

The invention relates to machine construction, and more specifically to devices for supporting non-rigid parts during processing on metal cutting machines.

The purpose of the invention is to increase the productivity by ensuring the possibility of working in automatic mode when changing over to different sizes of fixed parts.

FIG. 1 shows the lunette, general view; in fig. 2 — installation of the follower and support rollers; in fig. 3 shows section A-A in FIG. 2; in fig. 4 shows a section BB in FIG. 2; in fig. 5 - partial axial section of the steady. .

The lunette consists of a housing 1 mounted on a machine support (not shown) of a follower spool device 2 with a control spool 3 and an electromagnet 4j of two hydraulic cylinders 5. The spool device 2 containing a spool 3 interacting with the hydraulic cylinder 6 through a spring 7, controls the operation of two hydraulic cylinders 5. For metering. of the inertia of the lutet hydraulic system, look for the roller 8, mounted on the sled 9, is displaced by means of the screw 10 relative to the thrust rollers 11 by the amount C, so that when the lunette moves, the follower roller 8 is ahead of the thrust rollers 11.

The oil from the hydraulic system of the machine under pressure passes through the orifice 12 in the fixed piston 13 into the cavity 14 of the hydraulic cylinder 5. From the cavity 14 through the orifice of the nozzle, upwards; Into the piston 13, the oil enters the cavity 15 connected by a channel with the cavity 16 of the spool valve. From the cavity 16, the oil enters the annular recess of the hydrocylinder 6, in which the valve 3 moves, and from there through the opening 17 is discharged into the drain tank.

The lunette works in the following way.

 At the beginning of operation, the electromagnet 4 rejects the spool 3 to the highest position, thereby maximizing the gap between the zootnik 3 and the undercut of the hydraulic cylinder 6. The oil flows freely into the drain tank, causing the pressure in cavity 6 and 15 to drop. Under the action of the spring 18 hydrocypdials 5 are moved to the extreme.

02

the upper position, and through the plunger pair 19, which performs rigid feedback, the hydraulic cylinder 6 together with the spool 3 also moves

with to the highest position. The lunette is open.

When turning off the electromagnet 4, the valve 3 under the action of the spring 7 moves down, closing the gap

between the valve 3 and the recess and stopping the discharge of oil in the drain tank. The oil pressure in the cavity of the 15 hydro-cylinders 5 and the cavity 16 connected to it is a spool-type device

va grows. Hydraulic cylinders 5 and 6

together with the spool 3 are moved down until the rollers 8 and 11 are in contact with the workpiece 20, the drain slit is open, and

Due to the fact that the area of the cavity 14 of the hydraulic cylinder 5 is smaller than the area of the cavity 15, the valve by means of the screw 21 is adjusted so that the flow into the spool valve

The oil through the slot 3 formed by the spool 3 flows into the drain hole 17 with a certain intensity, balancing the depth in cavities 14 and 15. The thrust rollers 11 act on the workpiece 20 with a certain force.

With a change in the shape and size of the surface to be treated, on which the follower roller 8 is supported,

moves down or on the other side and slide 3. When reducing the diameter of the part 20 to be scraped out, slide 3 drops and interrupts the access of oil through the slit into the drain.

hole 17. In the cavity 15, the pressure increases, it becomes larger than in the cavity 14, the hydraulic cylinder Zvest,

roller 11 also goes down, 1

With increasing billet diameter

following roller 8 raises; The barrel 3 expands the gap formed by the spool and increases the intensity of oil drainage into the drain tank. The pressure in cavity 15 will become less

more than half a year 14, and the hydraulic cylinder 5, together with the roller 11, rises upwards.

At the end of the machining of the part 20, the electromagnet 4 is turned on, which, overcoming the resistance of the spring 7, moves the spool 3 upwards, thereby opening the oil drain into the drain tank. Oil pressure in the strip

t x 16 and 15 fall, and under the action of the spring 18 and the plunger pair 19, the hydraulic cylinders are moved to the highest position.

The electromagnet is switched on and off automatically when the toolholder retracts and retracts to machine the part.

g: g

3

6-6

Fi &

FIG. five

Compiled by A. Gavryushin Editor N. Pushnenkova Tehred M. Gergel Korrekod M. Demchik

Order 702/21 - Circulation 826 Subscription

VNIIPI USSR State Committee

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

Branch Iirni Patent, Uzhgorod, st. Project, 4

Claims (1)

. A MOBILE HYDRAULIC LUNET, in the case of which bearing support rollers are installed, two power cylinders connected to a spool device containing a follower roller, characterized in that, in order to increase productivity, the lunette is equipped with a hydraulic cylinder mounted with the possibility of axial reciprocating movement and spring-loaded relative to the spool, and the follower roller is mounted on the spool with the possibility of adjustment movement in the direction perpendicular to the axis of the spool.