RU1822357C - Method of casting rod manufacture - Google Patents

Abstract

Usage: production of rods for castings in mechanical engineering and repair production. SUMMARY OF THE INVENTION: after compaction of the mixture in the core box, one or more (if the rod is of complex shape) parts of the core box are removed, a frame is mounted on the remaining part, powdered, filled with a quick-hardening mixture and cured. Then the frame is removed, the core box is turned 180 °, the remaining parts of the core box are removed and the core is dried together with the formed single shaped plate. Advantageous effect: the invention allows to reduce the deformation of the rods by manufacturing directly on their surface rigid one-time shaped plates from quick-hardening mixtures. ё

Description

The invention relates to foundry technology and can be used in the production of complex castings in foundries of engineering enterprises and in foundries of repair facilities.

Closest to the technical nature of the proposed method is a method of manufacturing a rod, including filling, compacting and cutting off excess mixture, removing the rod from the box, laying it on a stationary drying shaped plate and subsequent drying.

The disadvantage of this method is that when using rod mixtures with organic binders (for example, starch), the strength

the rods in the wet state are so small that laying them on a sandy bed or a stationary drying shaped plate does not always guarantee that the rod does not deform during drying, especially in the manufacture of rods with complex configurations. This is due to the fact that it is more difficult to ensure tight contact between the surface of the bar and the surface of the stationary drying shaped plate, the more complicated the configuration of the bar. I

The purpose of the invention is to reduce the deformation of the rods in the process of removing them from the rod box and subsequent drying.

The method is carried out as follows.

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After the mixture has been compacted in the core box, excess mixture is cut off, one or several (if sturdy, irregularly shaped) parts of the core box are removed, a wooden frame is installed on the remaining part of the core box, the open surface of the core is dusted, and the space inside the wooden frame talcum powder or fine dry sand and is filled with a quick-hardening mixture, the mixture is slightly compacted, its excess is cut flush with the edges of the wooden frame and solidified. Then the wooden frame is removed, the formed single drying shaped plate with the core and the remaining parts of the core box is turned over 180 °, the remaining parts of the core core are removed and the core is dried together with the single drying shaped plate.

The method has been tested to form one-time drying shaped panels from various quick-hardening mixtures. The following mixtures were used: liquid glass, cured by blowing carbon dioxide, plastic self-hardening mixtures (MSS), liquid self-hardening mixtures (KSS) and

boat hardening mixtures based on synthetic resins (CTS).

Comparative test results of methods for manufacturing casting cores showed that the proposed method allows to practically eliminate the warpage of the core when it is removed from the core box and subsequent drying.

Claims (1)

The claims A method of manufacturing a casting core, comprising filling the core box with a mixture of organic binders, compacting and cutting off the excess mixture, removing the core from the box, laying it on a drying shaped plate and subsequent drying, characterized in that, in order to reduce the deformation of the core, as a drying shaped plate use a one-time drying shaped plate of quick-hardening mixture, formed directly on the surface of the rod after removal of one or more parts of the rod box.