RU202737U1 - ROD BOX - Google Patents

Abstract

The technical solution relates to the field of foundry production and can be used in the manufacture of casting cores on sandblasting rod machines with a gaseous catalyst purge. The core box contains a body (1), upper and lower halves, a pusher plate (3) with a pusher (5) for extracting the rod, a sleeve (4) installed in the lower half. The pusher is located in the bushing. The sleeve is fixed to the body, and flat vertical slots are made on its upper part, which is in contact with the rod being manufactured. EFFECT: improving the quality of the rods by improving the ventilation of the mixture when blowing with a gaseous catalyst, while ensuring the possibility of pushing the finished rods out of the core box cavity. 2 h. p. f-ly, 3 ill.

Description

The claimed utility model relates to the field of foundry, in particular to core boxes for the manufacture of casting cores on sand-fired core machines with a gaseous catalyst purge.

The technical problem lies in the fact that the geometry of the working cavity of the core box does not have a sufficient surface area, which in turn does not allow to place slots and pushers in the required zone, as a rule, in the recessed cavities of the core boxes and models.

The technical result, which the claimed technical solution is aimed at, consists in creating a core box design that provides sufficient ventilation of the mixture when blowing with a gaseous catalyst and for pushing out the finished sand mold (rods) from the core box.

From the prior art, a device is known according to the inventor's certificate No. 1002082 "Rod box" (IPC B22C 7/06, publ. 03/07/1983, bull. No. 9), containing the lower and upper halves, a pusher plate with pushers designed to extract the rod, rod the box is equipped with bushings installed with a gap in its lower half, in which pushers are located, having vertical grooves, and pins located in the vertical grooves of the pushers and fixed in the bushing.

Known device according to inventor's certificate No. 619276 "Core box" (IPC В22С 7/06, publ. 08/15/1978, bull. No. 30) for the manufacture of casting cores, containing a body with through holes and vents, the core box is equipped with a sleeve with through radial channels located with a gap in the through hole of the body, and the vent is installed in the cavity of the sleeve.

The closest in technical essence is the device according to the author's certificate No. 1050807 "Rod box" (IPC В22С 7/06, publ. 10/30/1983, bull. No. 40), containing a split body having a working surface and a push plate with pushers fixed in it , the core box is equipped with stepped pins, the lower ends of which are freely located in the pushing plate, and the upper ends are installed with a ventilation gap flush with the working surface of the case. This device is accepted by the authors of the claimed utility model as a prototype.

The disadvantages of these devices are poor ventilation along the gaps of the pushers, rapid clogging of the vents, which leads to poor sealing of the rods during inflation, as a result of which the castings are obtained with rejects.

The essence of the claimed utility model is illustrated by the figures:

FIG. 1 - Core box (general view) in section;

FIG. 2 - Core box - top view (view A);

FIG. 3 - Core box filled.

The core box contains a housing 1, an upper and lower halves, a working cavity of a core box (the produced rod) 2, a pusher plate 3 with a pusher 5 installed on it and a bushing 4 fixed to the body of the core box by screws 6.

In the upper part of the sleeve in contact with the rod to be produced, flat vertical slots are made.

The technical result is achieved due to the fact that in the proposed device the core box contains a body, upper and lower halves, a pusher plate with a pusher designed to extract the manufactured rod, a bushing installed in the lower half, and the pusher is located in the bushing, the bushing is fixed on the housing , and on its upper part, in contact with the manufactured rod, flat vertical slots are made.

The slots on the sleeve are made with a width (S) of 0.3 ± 0.03 mm, a length (L) of 2 ± 1 mm and a depth (H) of at least 10 ± 5 mm.

The core box works as follows. Before starting work, the core box is assembled and installed on the core machine. After installing the core box, start work. The core mixture under pressure is instantly supplied to the working cavity of the core box, while the air in the working cavity is displaced by sand and exits through the ventilation ducts, including through the slots made in the pusher. A mandatory feature of the ventilation ducts located in the cavity of the core box is that they must pass gas through themselves and at the same time must not pass the sand mixture. After filling the core box with the core mixture, the volume of the working cavity of the core box is purged with a gaseous catalyst (for example, trimethylamine). The gas penetrates the porous structure of the core mixture and is discharged through the ventilation ducts, including through the slots made in the sleeve, and a chemical reaction occurs, in which the mobile core mixture solidifies and becomes solid. Thanks to the slots made in the sleeve, it becomes possible to ensure the correct ventilation mode of the core box, and in some cases the only possible way to obtain a high-quality core.

The specified device is used in the foundries of the JSC "Scientific and Production Corporation" Uralvagonzavod "in the manufacture of rods and has confirmed its technical and economic efficiency.

Claims (3)

1. A core box containing a body, upper and lower halves, a pusher plate with a pusher designed to extract the manufactured rod, a bushing installed in the lower half, and the pusher is located in a bushing, characterized in that the bushing is fixed on the body, and on its upper of the part in contact with the rod being manufactured, flat vertical slots are made. 2. A core box according to claim 1, characterized in that the slots on the upper part of the sleeve are 0.3 ± 0.03 mm wide, 2 ± 1 mm long and 10 ± 5 mm deep. 3. A core box according to claim 1, characterized in that the height of the working part of the sleeve interacting with the pusher is 10 ± 5 mm, and its non-working part has a gap (Z) between the pusher and the bushing of 2 ± 1 mm.

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