SU435066A1 - DEVICE FOR FILLING FORMS UNDER ADJUSTABLE PRESSURE - Google Patents

Description

one

The invention relates to the field of foundry, in particular to equipment for die casting under controlled pressure.

When casting under controlled pressure, the operation of pressing the mold to the metal pipe and increasing the gas pressure in the cavity of the holding furnace must be strictly matched in time.

A device is known in which the required sequence of said operations is provided with corresponding interlocks in the control circuit of the mold pressing mechanism to the metal conductor and in the gas pressure control circuit in the furnace.

The disadvantage of such a device is that if a blocking electric circuit is broken or when the pressing mechanism executive malfunctions, pressure can be supplied to the furnace without pressing the mold to the metal conductor, and also the mold can be pressed at an excessive air pressure in the furnace. It is obvious that in these cases an emergency situation occurs.

The aim of the invention is to improve the reliability of operation and safety of operation.

For this, in the proposed device, a spring mechanism is introduced into the connection unit of the moving metal conductor with the furnace lid.

2

which automatically provides communication between the interior of the furnace and the atmosphere in the absence of pressing the mold to the furnace.

The proposed device is shown in the drawing.

A metal pipe 3 is installed on the lid 1 of the furnace 2. The flask 4 with the form 5 is placed on the mobile holder (the filling of ceramic forms is considered as an example). A special mechanism 7 (for example, a pneumatic drive) presses the flask to the furnace. The compressed gas is fed into the furnace and is released from it through the pneumatic actuator 8.

Vertical guides 9 are installed in the furnace lid, along which the metal pipe flange can move freely. This ensures the reciprocating movement of the metal pipe in a vertical

plane.

Springs 10 are installed between the metal pipe flange and the furnace lid, and at the top position of the oioki, the flange is pressed against the stops 11. In this position, between metal hydrogen sulfide and

the lid of the furnace there is a gap 12, and the cavity of the furnace is connected to the atmosphere. Around the hole in the lid 1 there is an annular groove in which the sealing ring 13 is laid. In the lower position of the flask

the flange of the metal pipe is pressed against the sealing ring, ensuring the tightness of the furnace.

The described device operates as follows.

Ceramic mold 5 is installed in the mold 4 with the sprue reed bowl and filled with filler. When assembled, the form is fed to the fill position.

Include the clamping mechanism 7 flasks to the furnace. When the flask is lowered, it first connects to the metal conductor, and then the fully mobile structure (flask with mold, stand holder, metal conductor), overcoming the force of the spring mechanism, presses against the furnace lid.

The mold is filled with melt when compressed gas is supplied to the furnace cavity. The rate of pressure increase is 0, 2 kgf / cm s, the upper limit of overpressure is 0.3 kgf / cm, the time for crystallization is 40 sec.

After relieving the overpressure, a command is issued to spin the flask. When mixed, ENI. And oioki upward in a place with a squeeze action of the force of the spring mechanism, mix, a metal conduit, the flange of which moves away from cover 1, and the cavity of the furnace is connected to the atmosphere.

The separation of the form from the metal conductor occurs when the metal pipeline reaches the upper end position, O1n, preferably by means of the stops of the 11th spring-loaded mechanism.

Then the form is fed to the position of knocking.

If, for any reason, the mold is not pressed to the furnace before pouring, the pressure will not increase when the gas is supplied to the furnace. In addition, if during pressurized casting a malfunction occurs in the clamping mechanism and the flask begins to stir up, the springs 10 provide for clamping the metal conduit to the mold. Therefore, an overpressure of the gas first occurs in the furnace, and then the metal pipe is disconnected from the mold.

Thus, the proposed device eliminates the possibility of creating overpressure in the furnace without pressing the mold to the furnace, and, therefore, eliminates the likelihood of an emergency.

Subject invention

A device for pouring molds at a controlled pressure, including a hermetic dispensing furnace, a metal pipe with a flange that is pivotal to the furnace lid, a mold clamping mechanism and a crawl, and a gas supply system to the furnace, characterized in that, in order to increase reliability and safety of operation the furnace has a hole of a larger diameter, in.m diameter of the metal pipe, through which the cavity of the holding furnace is connected to the atmosphere, and the sealing ring is located concentric with this hole on the lid That interacts with the annular projection on the flange metalloprovoda.