RU2237541C2 - Chamber for molding briquettes of casting mold from green molding sand - Google Patents

Abstract

FIELD: foundry.

SUBSTANCE: chamber for molding briquettes from green molding sand has tubular configuration. Chamber includes upper wall with charging opening, first end wall, second end wall and two lateral movable walls. First end wall is connected with hydraulic cylinder; second end wall is joined with articulation lever for opening chamber and pushing out briquette. Each lateral wall may be moved by means of hydraulic cylinder. Movable end walls are in the form of changeable pattern plate joined with framework. It is possible to change width of chamber depending upon volume of mould briquette due to moving lateral walls. Frameworks and pattern plates are changed on end plates.

EFFECT: lowered consumption of molding sand, enhanced efficiency of process.

2 cl, 5 dwg

Description

BACKGROUND OF THE INVENTION

The present invention relates to a molding chamber for casting briquettes from a raw moldable mixture, improved to reduce the consumption of the molding mixture required to form a casting briquette, which is achieved by selecting specific dimensions of the mold by reducing the size of the corresponding casting briquette using a variable volume molding chamber .

State of the art

In molding machines for mold briquettes intended for metal casting, there is a tubular chamber of a generally rectangular cross section, which is closed on one side by a movable wall mounted on a hinge to enable the removal of the mold briquette after molding, while on the other hand, it is closed by a wall connected to a drive piston designed for pressing and subsequent ejection of the mold briquette, that is, the specified chamber has four fixed Tenkai constituting the tubular body, wherein the top wall has a respective mouth or opening through which molding sand is fed, and two movable walls such that the whole formed of six faces of the molded preform mold.

In particular, as shown in the various steps shown in FIG. 1, a cavity for the moldable mixture is formed between two movable walls, appropriately separated (first step), then these movable walls are shifted towards each other to create a compressive effect and expel air ( second stage), after which one of the movable walls is displaced in the longitudinal direction outward and then is pulled up to open the free passage for the briquette of the mold (third stage), after which the other movable st the wreath, which is connected to the piston for compression and removal of air, is displaced by the piston, pushing the briquette until it connects to the previous briquette (fourth step), then the piston is again retracted so that it returns to its original position, and the form is filled (fifth stage), and finally the second articulated wall is lowered and displaced in the longitudinal direction until it is installed opposite the first wall (sixth stage), occupying the position of the first stage to carry out the next step spit work.

As can be understood from the above description, the performance of the molding chamber is determined by some of its constant parameters with fixed upper, lower and side walls, while in the case when it is necessary to cast a smaller size, theoretically it would be possible to use briquettes of a smaller size, i.e. using less molding sand, which is impossible, since it is necessary to fill the entire chamber installed in the machine with the molding sand.

Such excessively large sizes of cast briquettes lead to the following disadvantages:

- since the amount of molding sand at the factory is fixed (a certain number of tons), it may happen that the amount of available molding sand is insufficient to ensure the production process of the mold briquettes by the machine, that is, the number of mold briquettes molded by the machine will be limited by the available amount of molding sand at the warehouse of the foundry;

- the molding sand after casting and destruction of the molds must undergo treatment to remove contaminants, which includes transportation of the specified molding sand and loading and unloading operations with it, as well as subsequent processing, which involves financial costs and loss of time taking into account the large number of molding sand exposed processing.

A known chamber for molding briquettes of a mold from a raw molding sand having a tubular configuration and containing an upper wall in which a hole is made connected to a feed hopper for feeding the molding sand, a movable wall connected to a hydraulic cylinder and closing the tubular chamber body from one end, a wall covering the tubular body from the other end, connected to a hinged sliding lever for opening the chamber and pushing the formed briquette using the above hydraulic a cylinder and two side walls (see WO 93/11892 A3).

Improvements in the design of chambers for molding cast briquettes from a crude molding mixture, which are proposed in the present invention, can sufficiently solve the above problems.

Such improvements consist in creating a molding chamber of variable volume, which allows us to adapt it to the specific requirements of each type of mold briquette being molded, in particular, to reduce the theoretical and maximum dimensions of this chamber.

In particular, for this purpose, the chamber walls, which were previously stationary, are movable, formed in a certain way from the corresponding plates, each of which, in turn, is mounted on the frame of the mold holder with hydraulic cylinders designed to move them using guides, respectively mounted on the mold holder, which provide accurate displacement of the plates during their closing and opening movements.

Obviously, this also leads to the need to change two traditional movable walls, and on each of them a model plate is installed having the width of the formed briquette of the mold, and its width varies from the maximum size to the minimum size so that the maximum size corresponds to the largest width, provided for this molding chamber, and the minimum size is determined by the width of the frame of the mold holder, on which the corresponding model plate, preferably screwed, than said platen frame, in turn, is secured preferably by means of pneumatic clamps to the plate which in one case be connected with a pneumatic clamping cylinder, and in another case with a displaceable hinge arm, which allows to open the molding chamber.

Brief Description of the Drawings

To complete this description and in order to better present the characteristics of the present invention, in accordance with an example of its use in practice, a set of drawings is shown as an integral part of this description, which shows the following:

Figure 1 depicts, in accordance with a six-stage flow chart, the full cycle of a chamber for forming briquettes from a raw molding sand of a conventional type, such as that described in the Prior Art Section.

Figure 2 depicts a cross section of a molding chamber made with improvements in accordance with the present invention.

Figure 3 depicts a top view of the portion of this chamber depicted in the previous figure, set appropriately for molding briquettes of a maximum mold size.

Figure 4 depicts a device similar to that shown in the previous figure, but corresponding to the position of the chamber for forming briquettes of a casting mold of a minimum size.

Figure 5 depicts a perspective view of the location of the briquettes of the mold for obtaining identical castings, with half of them obtained using a conventional machine, and the other half obtained using a machine equipped with a molding chamber made with improvements in accordance with the present invention.

Preferred Embodiment of the Present Invention

First, we consider the usual main chamber, the operation of which is depicted at the various stages shown in Figure 1, in which the said molding chamber is indicated by the number (1) and which is formed by the upper wall (2) with the mouth (3) for filling the molding mixture from the corresponding funnel (4 ), the bottom wall (5), two fixed side walls, invisible in the indicated figure, and two other movable walls, moreover, one wall (6) is connected to the corresponding compressing and removing air piston, and one wall (8) is connected in its outline d, with an articulated lever (9), which can simultaneously be displaced in the longitudinal direction so that said wall (8) can be retracted from the wall (6) and then can be pivotally swiveled upward, as seen in the third stage, to remove the briquette mold (10). Improvements of the present invention consist in the fact that the two indicated side walls, which are not shown in FIG. 1, are also movable so that the volume of the chamber (1) can be changed in accordance with the conditions for the formation of a briquette of a mold (10) of each type.

In particular, each of these side walls is composed of a plate (11), which actually constitutes the wall itself mounted on the frame of the mold holder (12), to which the guides (13) are connected, which allow it to be transversely moved relative to the fixed holder (14) when they are driven by a hydraulic cylinder (15), so that these plates (11) can take the position of maximum separation, which in figure 2 is represented by continuous lines, or some intermediate position up to the position of the limited gap of maximum approach, which is represented by dashed lines in this figure. These two extreme positions are depicted, in turn, in a top view in figures 3 and 4.

In addition, between these plates or side walls (11) the frame (16) of the mold holder moves to which, as usual, a plate (17) is attached with screws, on which the corresponding models (18 - 18 ') are mounted, and this assembly is fixed in turn, preferably by means of hydraulic clamps (19) on the plate (20), attached, in turn, to the stem of the hydraulic cylinder (7), so that depending on the type of model plate (18 - 18 '), installed in each case on the same plate (20), different frames (16) must be installed with their corresponding model plates (17-17 '- 18-18 ¹ ), as shown, for example, in figures 3 and 4.

Obviously, a similar structure connected to the articulated lever (9) is mounted on another movable wall of the chamber.

This design allows to obtain for certain castings, as shown in figure 5, the briquettes (10) of the mold are much smaller, that is, using a much smaller amount of molding sand than would be required using a conventional molding chamber, as shown by reference number (10 ' ) in the upper left part of the indicated figure 5.

It is obvious that, due to the described design, the improvements in accordance with the present invention not only make it possible to significantly reduce the consumption of the molding mixture for molding casting briquettes, but also allow the use of various smaller machines, allow the flexibility to develop new tools due to the possibility of choosing according to the surface distribution of the model and optimizing process efficiency with a limited amount of molding sand in stock.

Claims (2)

1. Chamber for molding briquettes of a mold from a raw molding sand, having a tubular configuration and containing an upper wall in which a hole is made connected to a feed hopper for feeding the molding sand, a movable wall connected to a hydraulic cylinder and closing the tubular chamber body from one end , a wall covering the tubular body from the other end, connected to the articulated sliding lever for opening the chamber and pushing the formed briquette using said hydraulic hindra, and two side walls, characterized in that the two side walls are movable, each side wall consists of a plate (11), mounted on the frame (12) of the mold holder, connected to the guides (13) for sliding along the fixed holder (14), and has the ability to move using a hydraulic cylinder (15) to change the effective width of the chamber depending on the volume of the molded briquette mold. 2. A chamber for molding briquettes of a mold from a raw molding mixture according to claim 1, characterized in that the movable wall covering the tubular body from the end connected to the hydraulic cylinder and designed to compress the briquette and remove air from the briquette, as well as the opposite wall, connected to the articulated lever, made in the form of a model plate (17) connected to the frame (16) of the mold holder, attached, for example, by pneumatic clamps (19) to the plate (20) having a width equal to or less than the minimum width, etc dusmotrennaya camera, the pattern plate (17) and the frame (16) of the frames are replaceable with variable width.

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