SU946793A1 - Machine for pressure die casting - Google Patents

Description

one

The invention relates to foundry, namely, machines for casting under pressure and can be applied in chill and other machines having a battery drive.

Closest to the present invention is a machine for injection molding, containing mold locking and pressing cylinders connected via hydraulic control valves to pressure sources - high and low pressure pumps, pneumohydraulic accumulator connected to hydraulic piston distributor cavity of a pressing cylinder l.is

The presence of two pumps leads to the complexity of the design of the machine, its maintenance and repair.

The purpose of the invention is to simplify the design of the machine.

This goal is achieved by the fact that in an injection molding machine containing cylinders

molds and extrusions connected through hydraulic distributors to a pressure source, pneumohydraulic accumulator connected through a hydraulic distributor to the piston cavity of the pressing cylinder, rod rod closed cylinder is connected through a hydraulic distributor and non-return valve to a pneumohydraulic accumulator.

The drawing shows a schematic hydraulic schematic of the die casting machine in the initial position.

Claims (1)

An injection molding machine contains a cylinder 1 locking the mold, the piston cavity of which is connected via a control valve 2 to a pressure source 3 (a pump and a drain, and the rod cavity through a check valve A and the control valve 2 is connected to a drain. At that, the rod cavity of the cylinder 1 of the lock is connected through the valve 5 and the check valve 6 with the pneumohydraulic accumulator 7; Press cylinder 8, in turn, is connected with the pneumohydraulic accumulator 7, source 3, pressure through the hydraulic distributor 9; The device works as follows. After pressing the button, the cycle of the hydraulic distributor 2 switches to the left. The liquid from the source 3 of pressure enters the piston cavity of the cylinder 1. Locks the mold, since the maximum force of the lock of the mold is maintained at the end of the stroke of the mold {about 10 - 20% x.or, a), then the liquid from the rod end of cylinder 1 is recorded. through the distributor 5 and the check valve 6 enters the pneumohydraulic accumulator 7. which is charged. The volume of the rod cavity. Cylinder 1 locks the molds larger than the volume of liquid required for full charging of a pneumohydraulic accumulator. At the end of the cylinder piston stroke, locking the mold with a cam mounted on the movable plate of the foyer holder (not shown) switches the hydraulic distributor 5 and the liquid from the rod end of the cylinder, through the distributors 5 and 2, goes to the drain, which provides the necessary force of locking the mold. When the Injection button is turned on using known methods, the filling window of the glass is overlapped, the metal is collected, and then the hydraulic distributor 9 is turned on - the fluid from the pneumohydraulic accumulator 7 enters the piston cavity of the pressing cylinder 8 - the metal is pressed into the mold. After the crystallization of the casting, the splitter 2 control 9 does not switch. The working fluid through the check valve k enters the cylinder 1 locks the mold, the mold opens. At the same time, the pressing plunger ensures the ejection of the sprue from the glass. The valve 5 is switched by the spring to the initial position. The hydraulic valve E is switched and the fluid from the pressure source 3 flows through it into the rod cavity of the pressing cylinder 8. The valve 2 returns to its original position and the pressure source 3 switches to a drain. After servicing the tooling, the cycle is repeated. The use of the present invention will simplify the design, which will increase the reliability of the machine and improve its operational properties. Claims of the Injection Molding Machine, comprising mold locking and pressing cylinders connected through pressure distributors to a pressure source, a pneumohydraulic accumulator connected through a hydraulic distributor to a piston cavity of a pressing cylinder, that, in order to simplify the design, the rod cavity the cylinder is locked through a control valve and a check valve with a hydraulic accumulator. Sources of information taken into account in the examination 1. Manual machine maintenance. Maud. 71106. Tiraspol Foundry Machines Plant. S.M. Kirov, 1 97b, p. 1-50, fig. 18 (drawing No. 71106 00 OOORE).