Apparatus for determining separation speed of toxic gases out of poured casting molds

FIELD: foundry.

SUBSTANCE: apparatus includes upper mold-half and lower metallic mold-half. Upper flask is filled with sand and it has cavity for pouring melt metal and heat-insulation ring. Lower mold-half has base, sleeve and heat insulation cylinder. Sample of sand is placed into said cylinder and it is fixed by means of net. There is cavity between net and lid; said cavity is communicated with atmosphere through opening of lid and duct in which sampler is mounted. Other opening of lid is communicated with carrier-gas source through gas flow rate pickup. Gases are generated in sample by action of temperature of cast metal and they are filtered into cavity between net and lid where said gases are mixed with carrier gas. Flow rate of carrier gas is registered by means of pickup calibrated according to flow rate of selected carrier gas. Formed gas mixture is directed to sampler and in atmosphere. Mass speed of toxic gas separation is calculated on base of flow rate of carrier gas and concentration of toxic gas contained in samples of gas mixture. It is possible to use samples of different diameter.

EFFECT: enhanced accuracy of determining parameters of gas separation out of poured casting mold.

2 cl, 2 dwg

 

The invention relates to the field of foundry and is intended to define the parameters of outgassing from the filled mold in order to predict the gas filling compartments foundry under different conditions of production.

Known device for determining the rate of outgassing from the moulding and core sand mixtures, in which there are upper and lower mold halves, and the sample mixture. The plant is equipped with a calibrated washer and a V-shaped pressure gauge [1].

A disadvantage of the known plant is the fact that to measure the speed of gas undiluted tin gases from the investigated mixtures used calibrated washer, bagged by air. At the same time, chemical composition, moisture content and viscosity of the undiluted form gases that are released from the studied mixtures, differs significantly from the air, which makes a significant error in the measurement of the velocity of the gas from the liquid filled metal moulding and core Sands.

In addition, the design of the installation does not take into account the errors ofexperimentassociatedwitha differenceconditions of thermal decomposition of mixtures, as well as filtration of gases at the boundary of the sample mixture and lower mold halves and inside the sample mixture.

Known device for measuring the ing speeds outgassing of the filled mold, adopted as a prototype, which consists of a mold with the mixture, the metal proforma, sleeve with a sample of the mixture which is provided with an insulating cylinder, and the free end of the lid with holes, one of which is connected to the manometer, and the other with the atmosphere through a calibrated aperture [2].

The disadvantage is the lack of taking into account the errors caused by various conditions of thermal decomposition of the mixture, and filtering the gases at the boundary between the sample mixture and heat-insulating cylinder and in the inner regions of the analyzed sample. In addition, to determine the velocity of the gas undiluted tin gases from the sample, filled with liquid metal, use a calibrated aperture, calibrated by air. At the same time, chemical composition, moisture content and viscosity of the undiluted tin gas is significantly different from the air, which makes a significant error in the determination of the velocities of the emission of toxic gases from the sample mixture. For this reason, to improve the accuracy of determining the velocity of the allocation undiluted forming gases from the filled samples of the mixture it is necessary to introduce correction factors, which significantly complicates the method of determining parameters of gas filled mold.

Technical problem on which the information and communications technology aimed invention, is to improve the accuracy of determining the velocity of emission of toxic gases from filled metal of the sample mixture and, as a consequence, improving the accuracy of determination of parameters of outgassing of the filled mold.

This is achieved in that the device containing the upper proforma, which includes the mold with the mixture, the cavity for pouring the molten metal and the insulating ring, the lower proforma comprising a metal proforma, a base, a sleeve with insulating cylinder and a test specimen mixture, recorded with a mesh cover with two holes, forming, together with the net free cavity is given by the line through one of the holes with the atmosphere, according to the invention is further provided with a source of carrier gas and a sampler, with the source of carrier gas connected through the sensor gas flow and another hole cover to free cavity, and the sampler is installed in a line free cavity with the atmosphere.

In addition, the solution of a technical problem is achieved by the fact that in the variant of the device according to the invention the sleeve with the sample mixture is maderemovable, while the lower proforma comes with a set of support rings between the sleeve and the metal proformas.

The achievement of the technical objectives, namely improving the accuracy of determination of the rate of release of toxic gases from the samples of the mixture, it becomes possible due to the inclusion in the design of the device system with a carrier gas, through which the carrier gas, the flow of which is controlled by a sensor in the gas flow.

The control over the flow of carrier gas based on the calibration dependences obtained using the same carrier gas, thereby reducing errors in the measurements and calculations of the velocities of the emission of toxic gases. Moreover, the larger the diameter of the sample, the more accurate the determination of the total emission of toxic gases and their velocities per unit surface area of contact of the sample mixture with liquid metal, due to the reduction of errors associated with reducing the impact on the process of gassing peripheral areas of the sample that lies on the border with insulating cylinder, in which filter conditions and thermal properties may differ from the Central zone of the sample.

When the device is performed according to a variant, it is possible to study samples of different diameters, comprising a certain number. With the greatest accuracy of determining the velocity of emission of toxic gases will correspond to the largest diameter of the sample. When acompaantes the opportunity to use these data to extrapolate results to larger sizes of the samples, without conducting the necessary research.

The use of the design of the proposed device of the set of support rings allows you to explore samples of mixtures of different diameters, thereby allowing to take into account the error of the experiment, due to various conditions filtration of gases and thermal properties of the mixture at the boundary of the sample and heat-insulating cylinder and in the inner regions of the sample that are located in its Central part.

The invention is illustrated by drawings, where figure 1 shows the design of the proposed device in side view in section; figure 2 is a view explaining the design of the proposed device.

Device for determining the velocity of emission of toxic gases from the filled mold includes an upper proforma (drawing not labeled), which comprises a mold 1 with the mixture, the cavity 2 for pouring molten metal and the insulating ring 3, and the lower proforma (the drawing is not indicated), including metal proforma 4, a base 5, a sleeve 6 and the heat-insulating cylinder 7 sample 8 mix, recorded using the grid 9, a cover 10 with two holes 11 and 12, forming together with the grid 9 free cavity 13, indicated by the line 14 communication through one from the holes 11 of the cover 10 with the atmosphere. According to the invention the device is further provided with ICT is cinecom 16 carrier gas and the sampler 17. The source 16 of carrier gas connected through the sensor 18 of the gas flow and another hole 12 of the cover 10 to the free cavity 13, and the sampler 17 is installed in the line 14 free cavity with the atmosphere.

In a variant of the device according to the invention the sleeve 6 with example 8 a mixture is made removable, so the bottom proforma comes with a set of support rings 19 and 20 between the sleeve 6 and the metal proformas 4.

A device for determining parameters of gas release from the filled mold is as follows.

After filling the upper half-mold molten metal last fill up the cavity 2 of the mold 1 with the mixture. While using the insulating ring 3 elements of the upper half-mold and compacted teploizolyatsi from elements of the lower half-mold. Under the influence of high temperatures in the sample 8 a mixture of the processes of gasification, filtering and highlighting forming gases in the free cavity 13 between the grid 9 and the cover 10, in which toxic gases are mixed with a carrier gas (such as argon)from a source 16 through the communication line 15, the consumption of which is fixed by means of the flow sensor 18, a pre-calibrated at the selected flow of carrier gas.

The rate of emission of toxic gases from the sample mixture is determined by the speed of the gas and the filter is tion of gases through the sample. Filter conditions and gasification (thermal decomposition) on the border of the sample and heat-insulating cylinder and in the inner regions of the sample may be different. With increasing sample diameter part of the volume of the mixture at the interface of the sample and heat-insulating cylinder of the total volume of the mixture of the sample decreases, thereby increasing the accuracy of determining the rate of release of gases from the sample, since the peripheral (edge) layer has a smaller effect on the overall rate of evolution of gas and the total amount of gas released from the sample per unit surface area of contact of the sample mixture with liquid metal.

While the research process is conducted using a carrier gas, the flow rate of which is configured and controlled by the flow sensor is pre-calibrated by this gas, which reduces the possible error in the control parameters and calculations.

Next, the resulting gas mixture containing a carrier gas and a forming gas through the opening 11 in the lid 10 to the communication line 14 is sent to the sampler 17 and then into the atmosphere. Sampling of the gas mixture emerging from the free cavity 13, is a sampler 17 at different points in time. The current time counted from the beginning of the process of pouring liquid metal foundry Faure is s.

Knowing the flow of carrier gas W and the concentration of toxic gas Ki contained in the selected sampler 17 samples of the gas mixture forming gas with a carrier gas, calculated mass rate of emission of toxic gas from a sample mixture Wi, using the expression: Wi=W·Ki.

When using the device according to proposed (see figure 2) due to a set of support rings 19 and 20 between the sleeve 6 and the metal proformas 4 there is an opportunity to explore using one device of a whole range of interchangeable sleeves 6 samples of various diameters. This allows us to evaluate the error of the experiment, due to various conditions filtration of gases and thermal properties of the mixture at the boundary of the sample and heat-insulating cylinder and in areas inside the sample, in its Central part for samples of various diameters. Moreover, the larger the diameter of the liner with the sample, the more accurate will be determined by the rate of emission of toxic gases.

Pouring samples of various diameters liquid metal, we construct a mathematical model according to the number of moulding gases per unit contact area of the sample mixture with liquid metal, the diameter of the sample, which can then be extrapolated to the diameters of the samples of large size and to thereby evaluate their properties, and without the following. Ultimately increases the accuracy of determining the parameters of the outgassing of moulding and core Sands and accordingly the rate of outgassing from a single filled mold.

Thus, the proposed design of the device for determining parameters of gas release from the filled mold gives the opportunity to do so with greater accuracy, providing a copy of the study samples mixed with different geometric characteristics.

Sources of information

1. AS the USSR №193131, M CL 22 With 9/00, publ. 1967

2. Medvedev YA, Poghosbekian, Y.M. determination of the rate of outgassing. News of higher educational institutions. Ferrous metallurgy, 7, 1977, s-154 (prototype).

1. A device for determining parameters of gas release from the filled mold containing the upper proforma, which includes the mold with the mixture, the cavity for pouring the molten metal and the insulating ring, the lower proforma comprising a metal proforma, a base, a sleeve with insulating cylinder and a test specimen mixture, recorded with a mesh cover with two holes, forming, together with the net free cavity is given by the line through one of the holes in the cap with the atmosphere, characterized in that the device is provided with a source of carrier gas and a sampler, which is the source of carrier gas connected through sensor gas flow and another hole of the cover to free oral, as the sampler is installed in a line free cavity with the atmosphere.

2. The device according to claim 1, characterized in that the sleeve with the sample mixture is made removable, so the bottom proforma comes with a set of support rings between the sleeve and the metal proformas.



 

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