SU749560A1 - Pressure die casting machine - Google Patents

Description

(54) MACHINE FOR CASTING UNDER PRESSURE

one

The invention relates to foundry, in particular to injection molding.

A known die-casting machine that contains a frame, fixed and movable plate-forming plates connected by rods, compression and locking cylinders, the piston of the latter being an extrusion cylinder liner, multiplier, half-mold approach cylinders rigidly connected to the cylinder liner locking and the locking mechanism in the form of a cross washer, interacting with the crosshead mounted on the rods 1 ..

After pressing, to open the mold, it is necessary to relieve pressure from the cavity of the cylinder and to lock the cylinder of locking using the cylinders of the approaching half-molds, thus releasing the swivel washer from the interaction with the crosshead. After turning the cross washer, the working fluid is re-fed to the piston cavity of the cylinder to eject the pressostat with casting from the stationary part of the mold.

When this occurs, the cylinder liner is initially retracted for the full amount of its stroke, which takes additional energy and takes some time in the cycle, only after that pressure builds up on the piston of the pressing cylinder and the half-mold converting cylinders can be turned on.

The aim of the invention is to increase the productivity of the machine.

This goal is achieved by the fact that grooves are made on the inner surface of the cross-shaped washer, and protrusions are made on the outer surface of the cylinder piston that interact with the said grooves.

FIG. 1 schematically shows an injection molding machine with a closed mold; in fig. 2 - the same, when opened; in fig. 3 shows section A-A in FIG. one; in fig. 4 shows a section BB in FIG. 2

Claims (1)

The machine has a frame I with a fixed form-holder plate 2 located on it, through which rigid rods 3 are connected, connected with the cross member 4 and with the movable form-holder plate 5. At the right ends of the rods 3, the pistons of the half-form approaching cylinders are fixed. On the fixed shaper-former 2, the pressing cylinder 7 is rigidly fixed, the liner of which is inserted into the cylinder liner 8 of locking and is its piston. A locking mechanism in the form of a rotary cross-shaped washer 9 is located on the cylinder 8 locking sleeve. In this cylinder there is a multiplier 10 with a non-return valve 11 integrated in it. The cylinders 6 for the approach of the half-molds are rigidly connected to the cylinder 8 cylinder locking. The rotary cross washer 9 has projections 12 on the outer surface, and grooves 13 on the inner surface. Traverse 4 has grooves 14, and the piston of cylinder 8 has locks 15 on the outer surface. The machine works as follows. After the command to lock the mold is given, the working fluid enters the rod cavity of the cylinders 6 for the half-molds to come together and the movable plate-holder 5 moves to the right until the half-molds close. In this case, the turning cross washer 9 is turned in such a way that its projections 12 freely pass the yoke 4 through the slots 14 to the extreme right position. The cylinder liner 8 is locked under the force of the cylinders 6 of the approximation of the half-form is shifted to the left. After the semi-molds come together between the end surfaces of the protrusions 12 and the cross member 4, a guaranteed minimum clearance is formed, ensuring the free rotation of the cruciform washer 9. At the same time, the projections 12 leave the zone of the rows 14 of the cross member 4, and the grooves 13 of the washer become opposite the projections 15 of the piston of the cylinder . After the command to press in the metal, pressure is released from the rod spaces of the cylinders 6 to approach the half-molds and the working fluid begins to flow into their piston cavities and the working cavity of the cylinder 8 and lock from which through the non-return valve 11 of the multiplier 10 into the piston cavity of the pressing cylinder 7. The cylinder sleeve 8 is locked under the action of forces from the cylinders 6 of the approaching half-molds and the pressure in their working cavity moves to the right up to the stop against the projections 12 of the rotary cross washer 9 in the yoke 4. At the same time, through the slots 13 of the rotary restoobraznoy washer 9 freely pass the protrusions 15 of the cylinder piston 8 locking. Since the working cavity of the cylinder is locked with the piston cavity of the pressing cylinder 7, the force of the cylinder is transmitted to the movable plate-holder 5 through the rods 3, the yoke 4, its grooves 14 and the protrusions 12 of the rotary cross washer 9. This force is always proportional to the working pressure the cylinder cavities are locked and, therefore, proportional to the pressure on the metal in the mold cavity. After the crystallization process is completed, the pressure is released from the working cavity of the cylinder of locking and the piston cavities of the cylinders 6 when the half-molds come together. At the same time, pressure is supplied to the fluid cavities of the cylinders 6, the sleeves of which move the cylinder liner 8 together with the rotary cross washer 9 to the left as far as it will go. The washer 9 with grooves 13 extends beyond the protrusions 15 with a minimum clearance. The cross washer 9 rotates, its protrusions 12 are installed in the slots 14 of the crosshead 4 and the grooves 13 against the projections 15, causing the cylinder liner 8 to lock up and remain stationary when the pressure is turned into the working cavity of the cylinder 8 of locking and the piston cavity of the cylinder 7 is pressed through a multiplier 10 and its check valve 11 for pushing out the pressure switch with casting from the fixed part of the mold. Due to this, when, after fixing the cylinder liner 8, pressure is transferred from the rod cavities of the cylinders 6 to bring the half-molds closer to their piston cavities, the movable plate-mold holder 5 is moved to its original position. The proposed device allows to increase the productivity of the machine by reducing the masking time, reducing energy costs, by eliminating idle removal of the cylinder liner. Quantitatively, the productivity increase can reach 2-3%. The invention is a pressurized casting machine comprising a frame, a fixed and movable plate-form-holders, traversing tangles, a pressing cylinder, and a locking cylinder, the piston of which is a cylinder of the pressing cylinder, multiplier, proximity cylinders, a cross-shaped clamp of the locking mechanism interacting with the crosshead, differing from the "heme", that, in order to increase the productivity of the machine, grooves are made on the inner surface of the cross-shaped washer, and on the outer surface of the piston of the cylinder there are records Ani protrusions cooperating with said grooves. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2473473 / 22-02, cl. At 22 D 17/10. 1977. uz.i / J 15 f fS 8 / 5 12 8 6 FIG. year