CS243947B1 - Connection for sensing the velocity of the liquid metal during filling of the mold cavity - Google Patents

Abstract

The circuit for sensing the velocity of the liquid metal is intended mainly for determining the velocity of the liquid metal in the gate of the sprue system. According to the invention, it consists of two pressure sensors of the liquid metal, located before and after the gate of the sprue system, and of a differential amplifier, analog-to-digital converters, a root-extracting element, a digital-to-analog converter and a multiplier element.

Description

243947

BACKGROUND OF THE INVENTION The invention relates to a connection for the flow rate of a liquid metal during the filling of the mold cavity. Currently, the liquid metal speed sensing device during the filling of the mold is not known. The velocity of the liquid metal is determined by calculating from the speed of the filling piston. In the calculation, there are inaccuracies and deviations from the actual values, and the winding is not possible to regulate the velocity of the liquid metal in a time interval which is necessary due to the solidification of the metal.

Another method for determining the velocity of the metal is to calculate the pressure of the hydraulic fluid. This method is lengthy and inaccurate, since the pressure of the medium is sufficient with the accuracy of filling the mold cavity. The measured pressure of the medium with respect to solidification of the metal, in particular in the inlet of the intake system, does not reflect the course of the metal pressure and thus does not result in the filling rate of the mold cavity derived therefrom.

The aforementioned drawbacks eliminate the liquid metal sensing connection during the embodiment of the invention, wherein the first metal pressure sensor of the liquid metal and the second liquid metal pressure transducer are connected to a differential amplifier, wherein the output is connected or an analog-to-digital converter. on its output there is connected a square root member, on its output is connected a digital and analogue converter, on its output is connected a charging element, or an analogue square element and a multiplication element, where the first liquid metal pressure sensor is placed by a recess of the inlet system and a second liquid metal pressure sensor is located behind the inlet system inlet.

The connection for sensing the velocity of the liquid metal during the filling of the mold cavity of the invention makes it possible to obtain the velocity values of the liquid metal directly in the flow system. In this way, it is possible to obtain sufficiently accurate liquid metal velocity parameters to influence the cast-kbv quality.

The main advantages of engaging the liquid metal during the filling of the mold cavity are simple construction and low failure rate. Examples of connections for sensing the velocity of the liquid metal during filling of the mold are in Fig. 1 and Fig. 2. The connection in Fig. 1 has an analog-to-digital converter 7, a digital square root in comparison with the connection in Fig. 2. member 8 and digital-to-analog converter 9.

Liquid metal pressure transducers 1, 2, for example strain gauges located in the discharge channels 3, 4, which are behind the inlet manifold 5, are the pressure values pb p2 of the liquid metal in the inflow system and in the mold cavity. The velocity v2 of the liquid metal in the inlet of the intake assembly is determined from the relationship v2 = k. VPi - p2 where v2 - the velocity of the liquid metal in the slope of the system, k - constant,

P1 - the pressure of the liquid metal in the ejection channel located prior to cutting of the back-up system and β-the pressure of the liquid metal in the ejection channel located downstream of the recess of the system.

The electrical pressure values pj, p2 from the pressure sensor 1, 2 of the liquid metal (FIG. 1J are applied to the input of the differential amplifier 6, where these values are both strengthened and adapted to the relationship pt-p2 in the analog form. it is fed to an analog-to-digital converter 7a, and the received digital signal is applied to the input of the digital roaming member 8, at the output of which the β-p2 signal is obtained; the log shape is adjusted by a multiplier of 10 to form k. VPi - P2 = v2.

Another example of a connection for sensing the velocity of a liquid metal during filling of the mold is shown in FIG. 2. The connection and positioning of the pressure sensors 1,2 of the molten metal is the same as in FIG. 1. The electrical values of the pressures pb p2 from the liquid metal pressure sensor are applied to the inlet of the differential amplifier 6, here the signal is amplified, both adapted to the relationship P1-P2 in the analogue shape and applied to the analogue square member 11, the obtained signal VP1-p2 is to the input of the multiplication member 10, where it obtains a k-shaped signal. VpA-p2 = v2i.

Claims (2)

SUBJECT Circuit for sensing the velocity of the liquid metal during filling of the mold cavity, characterized in that the outputs of the first liquid metal pressure sensor (1) and the second liquid metal pressure sensor (2j) are connected to a differential amplifier (6) to which the output is connected or converter an analogue digital (7), its output is a square root (8), its output is a digital-to-analog converter (9) and its output is a multiplier (10) or an analog root (11) and a multiplier is connected to its output a member (10), wherein the first liquid metal pressure sensor (1) is located upstream of the inlet system cut (5) and the second liquid metal pressure sensor (2) is positioned downstream of the inlet system (5). 2 sheets of drawings