SU1526884A1 - Apparatus for producing casting moulds - Google Patents

Abstract

The invention relates to a foundry, and in particular to a molding machine. The purpose of the invention is to increase productivity by simplifying the process of adjusting the size of the mold in height. The device comprises a pressing table 1 connected to the piston rod of the pressing cylinder, and by means of guides 4 (spring-loaded) with a filling frame 3. In the device, the form thickness adjustment mechanism is made in the form of an outer casing 13 which is mounted concentric to the body 9 of the press cylinder and forming an annular cavity with it, inside which an intermediate sleeve 14 with an annular protrusion 15 is installed, dividing the cavity into two, each of which is connected to the valve 18 by pipes 16 and 17, The electrical associated with limit switches 22 and 23 mounted to cooperate with a contact plate 25 fixed to the press table 1. 4 yl.

Description

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electrically connected with the limit switches 22 and 23, installed with the possibility of interaction with the contact plate 25 mounted on the press table 1. 4 Il.

The invention relates to foundry, in particular, to molding machines with devices for compacting a mixture by pressing.

The aim of the invention is to increase productivity by simplifying the process of adjusting the size of the mold in height.

FIG. 1 shows a device for making casting molds, general view, in section; in fig. 2 - the same, before the operational pressing of the mold; in fig. 3 shows an outer cage associated with a press table with an intermediate sleeve in FIG. 4 - connection of the press table with the filling frame.

The device for making casting molds comprises a pressing table 1 with a model plate 2 located inside the filling frame 3 connected to the table by means of guides 4 movably mounted in sleeves 5 rigidly fixed at the corners of the pressing table 1. The filling frame 3 is spring-loaded relative to the pressing table 1 by means of a spring 6 connected to the stops 7 fixed on the press table. The press table is mounted on the piston rod b of the press cylinder, on the body 9 of which, under the press table 1, a limiter 1U is fixed with an annular cavity 11 therein. On the case 9 of the press cylinder, the outer ring 13 rigidly connected to the cover 12 is mounted concentrically with it a pressurized cylinder 9, an annular cavity, inside of which is movably mounted, is spaced on a sleeve 14 with an annular protrusion 15 dividing the annular cavity into - two: cavity B and cavity B, each of which is connected by pipes 16 and 17 to idroraspredelitelem 18 provided with magnets 19 and 20 and inductor 21 and electrically associated with the limit switches 22 and 23, ment of the mouth 24 on the frame to cooperate with the contact

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plate 25, mounted on the press table 1. In addition, the device is equipped with a knurled press head

26 with a model plate installed on the base 24 by means of a collar (not shown) and guides 27.

Empty flask 28 is mounted on brackets 29.

The device for making the molds works as follows.

At the beginning of the cycle, the oil pressure in the cavity of H and B is balanced. Compressed air is supplied to the annular cavity 11 (Fig. 1), which acts on the cover 12, as a result, the press table 1 together with the model plate 2, frame 3, guides 4, springs 6, bushings 5, and also the piston rod 8 of the press cylinder, the outer sleeve 13 and the intermediate sleeve 14 are raised up to the stop of the intermediate sleeve 14 into the stopper 10 (Fig. 2). A cavity A is formed between the cap 12 and the limiter 10, equal in size to the gap H (Fig. 1).

The filler frame 3 removes the flask-28 from the brackets 29. The molding mixture from the dispenser (not shown) is poured into the flask and the filler frame. Nakatna press head 26 with a model plate along the guides

27 is moved to the compaction position while simultaneously scrapping the mixture over the additional frame. The oil is fed into the cavity D under the piston-piston 8, which, lifting, under- presses the press table 1 with the model plate 2, the filling frame 3 and the flask 28 with the mixture until it stops in the rolling press head 26, having compacted the molding sand, in the process which the filling frame 3 under the influence of pressure transmitted through the flask 28 along the guides 4 moved in the sleeves 5, lowers, compressing the springs 6. After removing the sealing force - pressure relief from the cavity D - pressing table 1 under the action of pressure supplied to cavity g, n starts slow5

The downward movement, and the filling frame 3 under the influence of the spring unclamping force of the springs 6 presses the grip 28 for a while to the model plate of the rolling press head 26, having pulled the model plate 2 with the models. With further movement down the press table 1 with filler152

The filling frame 3 will take the initial position relative to the press table, move away from the rolling press head 26 (stretching its models), then the flask 28 will lower to the brackets 29, the press table 1 will take its original position.

At the moment of compaction, i.e. when the form is already fully compacted, the contact plate 25 interacts with one of the limit switches 22 (if the thickness of the form is greater than the specified one) or 23 (if the thickness of the form is less than the specified one), or does not interact with one or the other (if the thickness forms are normal, ie without deviations).

The sensors are mounted in height so that the distance between them corresponds to a normal, thickness of the form.

The adjustment of the TOL1TSIN form is made as follows.

The thickness of the form turned out more than the specified. The signal from the limit switch 22 goes to the electromagnet 19, which switches the core of the valve 18, and the oil from the cavity B through the pipeline 17 through the valve 18 and the throttle 21 goes to the drain (the oil flow is set to an adjustable choke 21), and through the pipe 16 the oil enters the cavity B, under the pressure of the oil, the intermediate sleeve 14 is lowered below by a certain amount and the gap H between the intermediate sleeve 14 and the stop 10 - (Fig. 1 will increase by the same amount. In the new cycle of operation of the device when applying compressed air ha into the annular cavity 11, the press table 1 together with the model plate 2, the filling frame 3, the guides 4, the sleeves b, the springs 6, the piston rod 8, the outer circumference 13, the intermediate sleeve 14 rises up to the stop of the intermediate sleeve 14 into the stopper 10 , but since the gap between the intermediate sleeve 14 and the limiter 10 increases

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Then, the initial position of the pressing table 1 will also be higher when cutting excess mixture with a scraper rigidly mounted on the knurled pressing head, moving it to the pressing position, the dose of the mixture Hf and, accordingly, the thickness of the compacted form will be less.

The thickness of the form turned out to be less than the specified. The signal from the limit switch 23 goes to the magnet 20, which will switch the valve core 18, and the oil from cavity B through line 16 through the valve 18 and throttle 21 go to drain (oil consumption set by adjustable throttle 21), and through line 17 to cavity C Under oil pressure, the intermediate sleeve 14 rises higher by a certain amount and the gap H between the intermediate sleeve 14 and the restrictor 10 (Fig. 1) decreases by the same amount. In the new cycle of operation of the device, when the compressed air is supplied to the annular cavity 11, the press table 1 together with the model plate 2, the filling frame 3, the guides 4, the sleeves 5, the springs 6, the piston rod 8, the outer race 13, the intermediate sleeve 14 rises up until the intermediate sleeve 1A stops against the limiter 10, and since the gap between the intermediate sleeve 14 and the limiter 10 is reduced, the initial position of the pressing table 1, respectively, will be lower after cutting off the excess mixture, its dose H rmy be more.

The use of the proposed device for the manufacture of casting molds simplifies the scheme for transmitting signals to adjust the initial position of the pressing table, which noBbjajaT the reliability of the adjustment process, reduces the correction time and leads in turn to improved performance.

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Claims (1)

Invention Formula A device for the manufacture of casting molds, comprising a frame, a rolling press head, a press table with a piston drive, a mechanism for adjusting the thickness of the mold, characterized in that, in order to increase productivity by simplifying the process of correcting the size of the foundry in height, the mold thickness adjustment mechanism consists of a yoke mounted on the outer surface of the piston actuator housing of the press table with the formation of an annular cavity inside which is located an intermediate sleeve with an annular protrusion dividing the annular cavity into two cavities , each of which is connected to a hydraulic distributor by pipelines. a limiter fixed in the upper part of the piston drive case and having an annular cavity on the upper surface connected by a pipeline to the compressed air supply system, limit switches mounted on the frame and electrically connected to the hydraulic distributors of the contact plate fixed to the pressing table with this device is equipped with a lid rigidly fixed to the upper part of the clip. , 2 .3 ut t