SU478676A1 - Installation of continuous centrifugal casting of hollow billets - Google Patents

Description

movably connected with the slats 23, and above each shoe there is a lever 24, at one end of which there is a load and the other rests on the strap 23.

Before the melt is poured, the cavity of the mold is closed with a seed, which extends along the length of the mold and the drawing mechanism, and its end is placed between the grips. The grips are in their forward position when the seed is inserted, and the roller on the lever 18 touches the stop closer to the mold, and the cam 17 is rotated so that its smaller diameter located between the stops 21 allows the springs 14 to press the clamps 12 through the slats 10 to "seed. The discs 7 at this time are shifted to the side of the fill, which corresponds to the retracted rods of the cylinders 5, located on the casing of the casing 3 (from the side of the zaliac), and extended by the rod from the opposite side.

Initially, prior to pouring the melt, the rotor is reported to rotate with a speed specified in the technological process. Then pouring the melt into the mold begins. The melt, draining from the sector bucket with a uniform weight velocity, passes through the sprue bowl into the casting neck, where it is pre-curled and enters the crystallizer. In the mold is the sequential formation of a hollow billet or pipe. After a predetermined period of time after the start of pouring, the stretching device is turned on, which first removes the seed, then the casting connected to it outside the limits of the crystallizer and the rotor.

The operation of the mechanism for extracting the workpiece is carried out as follows (see Fig. 2).

During rotation of the rotor 1 of the housing 3, mounted on bearings 4, the cylinders 5 located on them are fixed.

All other elements of the exhaust mechanism rotate with the rotor 1. In this case, the rollers 6 of the cylinder rods 5 roll over the disks 7.

The operation of the device during drawing begins from the leftmost position of the discs, when the grippers compress the workpiece and the cylinder rods of the left housing of the holder are retracted. From the automatic impulse to the electromagnets of the spools controlling the hydraulic cylinders, the rods slide out and move the disk system to the far right position. At the end of this working stroke, the cam 17 spreads the grippers.

When reaching the stop 20 located on the bracket 19, which is in the path of movement, the roller mounted on the lever rests on the stop 20 and as the system moves further towards the exhaust, the lever 18 rotates, turning the cam 17 so that its larger diameter between the lugs 21. As a result, the springs 14 are expanded, and the shoes release the workpiece and are retracted from it. After that, the cylinder rods 5, located on

the yoke 3 from the pouring side is retracted, and the cylinder rods located on the opposite side are extended. Disks 7, reinforced in the stags 8, move longitudinally in guides 9 towards the fill.

the system.

Moving in the direction of the pouring and reaching the stop 20, located on the bracket 19, which is in the path of movement, the roller fixed on the lever 18 rests on

the stop 20, and with further movement of the system towards the fill, the lever 18 rotates, turning the cam in such a way that its smaller diameter lies between the stops 21, whereby the springs 14

the shoes are pressed against the work piece 2. This completes one cycle of operation of the casting extraction mechanism, which is subsequently repeated many times.

The operation of the cylinders 5 moving the system is arranged in such a way that the extraction of the casting and the return stroke of the system can be regulated within wide limits depending on the technological need.

From the extreme right position, the disc system is moved by the cylinder rods mounted on the right housing of the yoke. In the extreme left position, the cam reduces the grips. Drive system direction

changing, and moving to the right position, they pull the workpiece by the amount of stroke.

During the working stroke of the disk system, the following interaction of the parts takes place: the grippers 12 clamp the workpiece with a predetermined constant force regardless of the speed of rotation.

Rotating and simultaneously moving in the longitudinal direction, the shoes, pressed against the workpiece by springs, with a given force, clamp it out of the crystallizer. In order to achieve a constant pressure of the shoes on the workpiece 2 in the field of centrifugal forces, which tend to squeeze the shoes from the workpiece, and also to maintain optimal

the size of the springs 14, pressing the shoes to the workpiece, applied the levers 24, pivotally mounted on the rotor. At one end of each of the levers 24 there is a counterweight of the required size, the other end of the lever 24

rests on the bar 23, which, through the rollers 22, presses the shoe against the workpiece 2. The levers 24 with counterweights automatically balance the considerable forces acting on the shoes arising from

centrifugal force. The rollers 22 located between the bar 23 and the shoe serve to reduce the friction of the shoe when it is moved. Moving in the direction of stretching, the shoes and slats 10 carry away the rods 13 with springs fixed on them and

sleeves 16, on which there is a cam 17 with a lever 18.

Subject invention

An installation for continuous centrifugal casting of hollow blanks, including a rotor, inside of which is a mold, cooling systems and a mechanism for pulling the billet with grippers, characterized in that.

that, in order to reduce the deformation during extraction of the blanks from the mold and stabilize the specific pressure on the workpiece in zero centrifugal forces, the grips are equipped with a device for adjusting pressure on the workpiece and levers of the nerve of the genus, the axes of which are fixed on the rotor, do not have one shoulder; and the other is supplied with cargo.

7 S 9 and W i8 FIG. 2