SU404561A1 - METHOD FOR REMOVING CASTINGS FROM CASTING FORMS - Google Patents

Description

one

The invention relates to the field of foundry and can be used in the production of large-sized thin-walled, ribbed panel castings.

There is a known method for removing panel castings from casting molds by creating an overpressure of gas that acts on the casting in the mold.

However, when ejecting thin-walled panels with single fin and with finishes with symmetrically located structural elements, uneven removal of cast surface elements from the surface of the mold is observed due to the interchangeable parts of the casting sheet with the foundry mold, resulting in warping of the cast, resulting in distortions, in the case of casting, and distortions, in the case, in the mold, with casting mold. types, etc.

The aim of the invention is to reduce the crusting of castings.

According to the proposed method, the gas overpressure in the mold half forming the structural elements of the casting is created before the mold opening simultaneously with the vacuum in the other mold half, and after the mold halves are opened in this other mold the gas overpressure is created.

FIG. 1 is a diagram illustrating the process of creating an overpressure of gas and vacuum in the half-molds before opening.

2

forms; in fig. 2 is a diagram illustrating the process of removing the casting from the mold after opening the half-molds.

The removal of castings according to the proposed method is carried out as follows.

After the casting crystallizes / in the mold half 2, which forms the casting surface of the casting, vacuum-Pi is created, and in mold mold 3 - an excess gas P2, which

affect pas ohlnvku through norpstye cermet filters - /. Thus, the crystallized casting before opening the casting is affected by two forces - / - n P2, directed in one direction and

Pressing the casting to the zero-mold 2. When the mold is opened, the mold half 3 moves to the left, as shown in the fpg. 2, and the casting remains in the mold half 2, the sonrikas with their semi-smooth surface with the half-form due to the vacuum of -R force between the casting and the half-form. To remove the casting from the zeroform 2, it creates an excess pressure of P3, which through the metal-ceramic filters 4 acts on the PLCT and pushes it out without deformation, since the back contact between them is smooth and has no local resistances that could warp the casting.

Thus, to reveal the half-form on

The casting is acted upon by the forces PI and P-2, pressing it against the smooth half-form and thereby enhancing the effect of removing the casting from the rib and structural elements when opening the form. And since the casting remains in the half-form, which forms the smooth (flat) surface of the casting, BOSXIOJKHOCTI ... prevents the casting of the casting when pushed out. Subject and Datum and Method of removing foundry castings

Forms, including creating an overpressure in the cavity of one of the half-molds, characterized in that, in order to reduce the warping of the castings, an overpressure of gas is created before the mold is opened, while simultaneously creating a vacuum in the bottom of the other mold, and after opening it, an overpressure of gas is created.