SU437566A1 - Press mechanism for die casting machine - Google Patents

Description

one

The invention relates to foundry.

The known pressing mechanism contains two independent cylinders, in which the CmMotive assembly nress-piston, consisting of an outer piston with a hollow spindle, inside which the floating rod passes, its piston.

However, the presence of two separate piston drives increases the size, weight, and complicates the machine for injection molding.

The aim of the invention is to accelerate the build-up of pressure back pressure.

This is achieved by the fact that in the proposed mechanism, between the non-working end of the internal press nord and the end of the stem, there are installed kachaush, levers, each of which is pivotally fastened with one end on the external press of the piston, and the internal press of the piston is spring-loaded.

FIG. Figure 1 shows the pressing mechanism of a machine for pouring a node at the start of a casting cycle, with a longitudinal section; on fkg. 2 - the same at the beginning of crystallization.

The pressing mechanism consists of an external press-piston 1, an internal dress-piston 2, rocking levers 3, a power cylinder 4 with a rod 5, a spring 6 and a pressing chamber 7.

The ratio of the arms of the levers 3 and the force of the spring 6 is adjusted in such a way that both press pistons act on liquid metal with the same specific pressure.

Press mechanism for casting machine

node pressure works as follows. When the metal is pressed prior to its crystallization, the outer 1 and inner 2 press pistons move at the same speed. As the metal layer that has crystallized on the walls of chamber 7 increases, the movement of the external press piston 1 slows down, and when the pressure of the external press piston 1 becomes insufficient for pressing, it stops.

At this time, the rod 5 of the power cylinder through the swing levers 3 continues to press on the inner press piston 2. The latter continues to move and, penetrating deep into the still liquid, crystallized metal,

makes a nodpressing.

After the mold has been opened and the casting has been removed, the external press bushing 1 is retracted and the internal press piston 2 is retracted by the action of a spring 6

returns to extreme iradoe.

Prevention Invention

The press mechanism of an injection molding machine containing a ram.

On the stock of which the external press-piston with a telescopic internal press-piston is movably mounted, resting against the non-working end against the rod end, characterized in that, in order to accelerate the build-up pressure, between the non-working end of the internal press-pist and the end of the rod, swinging levers are installed Each of which is hinged at one end at the outer press piston, and the internal press piston is spring-loaded.

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