RU2178162C1 - Device measuring fluidity of moulding and core sands - Google Patents

Abstract

FIELD: foundry, specifically, analysis of any moulding and core sands used at engineering works. SUBSTANCE: device has punch made in the form of stepped cylinder. Cylinder of larger diameter is located inside sleeve and cylinder of smaller diameter has side through annular groove running along its element. Plate anchored on L- shaped rod is mounted for movement inside cylinder of larger diameter perpendicular to its axis. One arm of rod is positioned on axis of cylinders and another arm of it is brought into side annular groove of cylinder of smaller diameter. Scale is marked on outer surface of cylinder of smaller diameter. EFFECT: reduced time of test, higher reproducibility and accuracy of experiments, emergence of possibility of testing sands of high fluidity. 1 dwg

Description

 The invention relates to foundry, in particular, it may be necessary for the analysis of the fluidity of any molding and core mixtures used in engineering plants.

 A known analogue is a device for determining the fluidity of a core mixture, which is a cylindrical sleeve with a removable bottom and a punch located inside the sleeve with the possibility of movement along its axis (1).

 This analogue has the following disadvantages: it allows you to determine the fluidity of a small range of core mixtures, does not allow you to determine the fluidity of molding mixtures.

 To eliminate these drawbacks in the inventive device, the punch is made in the form of a stepped cylinder. A cylinder of a larger diameter is located inside the sleeve, and a cylinder of a smaller diameter is made with a through side groove located along its generatrix. Inside the cylinder of larger diameter, perpendicular to its axis, a plate is mounted with the possibility of movement mounted on the L-shaped rod, one shoulder of which is located on the axis of the cylinders, the other is brought into the side groove of the cylinder of a smaller diameter, and a scale is plotted on the outer surface of the cylinder of smaller diameter.

 The drawing shows a device for measuring yield. The punch 1 is made in the form of a stepped cylinder. A cylinder 2 of a larger diameter is located inside the sleeve 3, and a cylinder 4 of a smaller diameter is made with a through side groove 5 located along its generatrix. Inside the cylinder 2 of a larger diameter, perpendicular to its axis, a plate 6 is mounted for movement, fixed on a L-shaped rod 7, one shoulder of which is located on the axis of the cylinders, the other is brought into the side groove 5 of the cylinder 4 of a smaller diameter, and on the outer surface of the cylinder a smaller diameter is marked with a scale of 8.

The device operates as follows: a portion of the molding or core mixture is sifted through a sieve 6 into a standard sleeve 3 with an inner diameter of 50.0 ± 0.05 mm and a height of 150 mm. The sleeve 3 is placed under a standard laboratory coper (not shown in the drawing). The load on the copra weighing 3.5 kg gently lowers into the sleeve 3 and produces one hit. Then the sleeve 3 is removed from the copra, and the punch 1 is lowered into it. Then the sleeve 3 with the punch 1 is placed in a hydraulic press (not shown in the drawing), where the mixture is densified at a pressure on the mixture of 10 kg / cm ² . The mixture under pressure from the press begins to flow into the inner cavity of the punch 1. On the punch 1, a millimeter scale 8 is glued on the outside, which indicates the movement of the rod 7 during sealing and which is calibrated under the flow rate. The plate 6 is moved together with the rod 7 up, indications of the fluidity of the mixture are read during pressing. The pressure gauge (not shown in the drawing) measures the pressure on the mixture, when the desired pressure is reached, the pressing ends and the sleeve 3 with the punch 1 are removed from the press.

 The sample is removed, the sleeve is cleaned, the experiment is repeated twice.

 The result is the average of three tests.

The technical result that is obtained from the use of the invention is that:
- reduced test time;
- there is a large reproducibility and accuracy of experiments;
- there are opportunities for testing mixtures with high fluidity.

Sources of information
1. Shumov I. D. "Development of binder compositions and optimization of compositions of molding and core mixtures based on epoxy resins", UDC 621.74.486, dissertation for the degree of Doctor of Technical Sciences, Lipetsk, 1997

Claims (1)

 A device for determining the fluidity of a mixture is a cylindrical sleeve with a removable bottom and a punch located inside the sleeve with the possibility of movement along its axis, characterized in that the punch is made in the form of a stepped cylinder, a cylinder of a larger diameter is located inside the sleeve, and a cylinder of a smaller diameter is made with a lateral groove located along its generatrix, inside a cylinder of a larger diameter, perpendicular to its axis, is mounted with the possibility of movement of the plate mounted on the G-arr ZNOM rod, one arm of which is located on the cylinder axis, and the other - is derived in the smaller diameter side of the cylinder bore and the outer surface of the smaller diameter cylinder deposited scale.