SU1435369A1 - Method and apparatus for determining ductility of core and moulding sands - Google Patents

Abstract

The invention relates to foundry and can be used in foundries and laboratories to determine the fluidity of molding and core mixtures used in sandblasting and sandblasting processes. The aim of the invention is to improve the accuracy and accuracy of measurement results. The essence of the method is that a mixture of the mixture is placed in the sleeve, compacted to the required density, and compressed air is supplied evenly over the upper surface of the sample. A device for determining the fluidity of the molding mixtures contains a sleeve 1 with solid walls, in which a mixture of the mixture is placed. Through the top with "

Description

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The liner 1 is supplied with compressed air by means of an aerodynamic grille 5. A portion of the mixture is blown out through a calibrated orifice 7 into the cup 10, in which in its lower part 1435369

are filled with grooves 11 for air outlet. From the ratio of the weight of the displaced portion of the mixture to the first weight of its mixture, the flowability of the mixture is determined. 2 sec. item f-ly, 2 ill.

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The invention relates to a foundry and can be used in foundries and laboratories to determine the fluidity of molding and core mixtures used in technological processes of sandblasting and sandblasting.

The purpose of the invention is to increase the reliability and accuracy of measurement results.

Pre-determine the mass of the sample for the test mixture based on the required density of the compacted sample before inflating and its volume.

 The required density of the sample before inflating must be equal to the density of the mixture in the liner of a real machine in real conditions. This achieves an increase in the reliability of flow measurement results. Know the required density of the compacted sample f and its volume V, since the height of the compacted sample and the diameter of the sleeve are known, the required mass of the sample is determined by the formula

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The sample is placed in the sleeve, compacted to the required density, simultaneously leveling and limiting it in height. It is then applied to the upper surface of the mixture with compressed air to displace it through a calibrated orifice from the sleeve. The displaced part of the mixture is weighed and the fluidity of the mixture is evaluated by the ratio of its mass to the initial mass of the sample.

Fig. 1 shows a device for determining the fluidity of mixtures at the time of stabilization of the mixture in height and density; figure 2 - the same, at the end of the sand-blowing process.

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The device for determining the fluidity of the mixtures includes a sleeve 1 with a flange 2 and a seal, 3, on which a cover 4 with an aerodynamic grille 5 is installed. A replaceable sleeve 6 with a calibrated orifice 7 is located in the bottom 8 with a seal 9. At the bottom of the glass 10 there are ventilation grooves 11, under which a pallet 12 is installed. The lid 4, the sleeve 1, the bottoms 8, the cup 10 and the pallet -12 are fixed with a clamp 13. The driver 14 has a flange 15.

The method is carried out as follows.

A cup 10 with ventilation grooves 11 is installed on the pallet 12. A sleeve 1 with a flange 2 and a seal 3 is placed on the bottom 8 with a replaceable sleeve 6 with a calibrated orifice 7 of a certain cross section and a seal .9 on the working surface. Seals 3 and 9 will eliminate air leaks from the sleeve into the gaps between the contacting planes of the parts during the impact on the compressed air mixture. In the sleeve 1, weighed the test mixture to a certain weight, and with a flange 15, the mixture is compacted. This flange 15 of the copra 14 provides a certain constant height and density of the mixture in the sleeve 1. Then the sleeve 1 with the bottom 8 is covered with a crest 4 with an erodynamic grid 5, which is connected to a source of compressed air. Compressed air before inflation is stabilized in terms of pressure. The cover 4, the sleeve 1, the bottom 8, the glass 10 and the pallet 12 are fixed with a clamp 13. Open the supply of compressed air into the sleeve 1 for a certain time. Under the action of compressed air part of the mixture b

pegs, differing in that, in order to increase the reliability and accuracy of the measurement results, the effect on the sample is compressed at home and compacted to a given density and the standard high impact with compressed air is directed and equal to

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from the sleeve 1 through the calibrated orifice 7 is displaced into the pallet 12. A cavity c is formed in the sleeve 1. Then, the cover 4 is removed, as well as the sleeve 1 together with the bottom 8 and the bowl 10. The pallet 12 with the displaced part of the mixture is weighed. The flowability is judged by the mass of the part of the mixture, located on PALLET 12. If necessary, Q on the upper surface of the sample, the flowability can be judged by the ratio of the mass of the part of the mixture that turned out to be on the sump 12 to the original mass of the mixture.

The application of the proposed method for determining the fluidity of the mixtures and the device for its existence will allow a more accurate assessment of the quality of the mixture, which will ensure a better quality of compaction of the molds and cores. This will ultimately improve the quality and

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2. A device for determining the strength of the core and molding of this, containing a sleeve mounted on a removable bottom with a calibrated center hole, under the cat is placed a glass with holes for air outlet, and a mechanism for writing compressed air into the sleeve, , in order to ensure the accuracy and accuracy of the measurement results, the device is equipped with an aerodynamic sieve installed between the compressed air supply mechanism and the top of the sleeve, and a removable sleeve and nastoychivy material with a gauge hole, while the walls are filled with Continuous, the glass is not removable with a bottom in the form of a bottom, and the holes for the air outlet of the glass are made in the form of a flow through in its lower end.

Claims (2)

1. A method for determining the yield strength of core and molding mixtures, including placing a standard mixture hinge in a sleeve, a short-term effect on the hinge with compressed air, displacing a portion of a hinge-. through a calibrated orifice of the liner and weighing of this part of the sample, characterized in that, in order to increase the reliability and accuracy of the measurement results, before exposure to the sample with compressed air, it is compacted to a predetermined density and standard height, and the exposure to compressed air is carried out and evenly on the upper surface of the sample, on the upper surface of the sample, 2. A device for determining the fluidity of core and molding compounds containing a sleeve mounted on a removable bottom with a calibrated center hole, under which is placed a glass with holes for air outlet, and a mechanism for supplying compressed air to the sleeve, characterized in that the purpose of increasing the accuracy and accuracy of the measurement results, the device is equipped with an aerodynamic grille installed between the compressed air supply mechanism and the upper part of the sleeve, and a removable sleeve of wear-resistant material with a calibrated orifice, the walls of the sleeve are solid, the glass is made with a removable bottom in the form of a tray, and the air outlets from the glass are filled in the form of grooves in its lower end. 1