RU88353U1 - DEVICE FOR INTEGRATED QUALITY CONTROL OF ALLOYS - Google Patents

Abstract

A device for comprehensive quality control of alloys, consisting of a temperature measuring sensor, a shrinkage measuring unit, an analog-to-digital converter, a computer, software, characterized in that it includes a thermopower measuring unit consisting of two metal electrodes immersed in the melt and software that allows interpretation computer data received.

Description

The utility model relates to the field of metallurgy, and in particular to alloy quality control devices.

A thermoelectric device for monitoring metals and alloys [1] is known, containing cold and hot electrodes, relays, a variable resistor, a transformer, a time switch included in the temperature gradient circuit, an artificial thermocouple formed by a spring-loaded hot electrode and a foil ring located directly in the zone contact between the hot electrode and the product being monitored, and a winding placed on the device’s body and powered by alternating current. The disadvantage of this device is the limited application associated with the fact that the device provides for direct contact with the finished product. It also excludes the possibility of affecting the quality of the product during cooking.

It is known [2] a thermoelectric device for conducting rapid analysis of impurities in the process of manufacturing alloys. The disadvantage of this device is the sampling in the melting process.

It is known [3] a thermoelectric device for thermal analysis of alloys, consisting of a temperature sensor, an analog-to-digital converter, a computer and allowing to control the morphology of eutectic alloys. The principle of operation of the device is as follows: the melt temperature is measured in a crucible using a chromel-alumel thermocouple, then the signals are processed in an analog-to-digital converter, transmitted to a computer and presented in graphical form. The disadvantage of this device is the low accuracy in estimating the temperature ranges of phase transformations and the inability to assess the kinetics of shrinkage processes occurring in a crystallizing alloy.

Closest [4] to the proposed utility model is a device for controlling the quality of alloys, consisting of a temperature measuring sensor, a shrinkage measuring unit, an analog-to-digital converter, a computer, software that allows you to interpret the data in a computer.

The disadvantage of this device is the low accuracy in estimating the temperature ranges of phase transformations and solidification kinetics.

The objective of the proposed utility model is the creation of a multifunctional device that allows to evaluate in a complex structural changes in the process of crystallization and shrinkage of alloys due to the influence of various technological factors.

To solve the problem, the thermoelectric power measuring unit, which consists of two metal electrodes immersed in the melt and software that allows interpreting the data obtained in a computer, is additionally introduced into the known device [4]. The potential difference of the electrodes is transmitted to the computer by means of an analog-to-digital converter.

Figure 1 shows the claimed device.

Figure 2 shows the combined thermal cooling curve (1), the thermopower curve (2) and the shrinkage curve (3) of the alloy obtained using the device described above.

The claimed device contains a metal flask 1; a cylindrical cavity 2 in a sandy-clay form, where the melt is poured; cork 3; base 4; funnel 5; traction 6; plate 7; small displacement sensor 8; chromel-alumel thermocouples 9; electrodes 10; analog-to-digital Converter 11; Computer 12. Chromel-alumel thermocouples 9, electrodes 10, and small displacement sensor 8 are connected directly to analog-to-digital converter 10, which is connected to computer 12 by cable.

The device operates as follows. Chromel-alumel thermocouple 9 allows you to measure temperature. The potential difference between the electrodes 10 is a function of temperature and structural changes during crystallization of the melt. The sensor 8 small displacements through the rod 6 and the plate 7 detects a change in the size of the sample (shrinkage) during crystallization. The electrical signals from the chromel-alumel thermocouple 9, the electrodes 10, and the small displacement sensor 8 are sent to the analog-to-digital converter 11, processed, transmitted to the computer 12, using the software they are converted into graphical dependencies and presented on the computer monitor as combined (Fig. 2) the thermal cooling curve, the thermopower curve and the shrink curve. These curves show the kinetics of the phase transformations of the melt during crystallization, the kinetics of the shrink process, the kinetics of solidification, and are mutually complementary. The combination of curves makes it possible to more accurately determine the effect of the chemical composition and state of the melt on its crystallization, shrinkage, and solidification.

This device allows you to more reliably study the process of forming the structure of the alloy during crystallization, shrinkage and solidification and manage its operational properties by monitoring and regulating the parameters of melting and casting.

INFORMATION SOURCES

1. Auth. St. RU 2134875 C1 cl. G01 No. 25/32.

2. Auth. St. RU 2119661 C1 cl. 6 G01 No. 25/32.

3. Kiselev S.V., Dovnar G.V. Universal device for thermal analysis of alloys // Foundry. 2004. No3. S.27.

4. Patent for utility model RU 69071 U1 IPC C22C 1/02.

Claims (1)

A device for comprehensive quality control of alloys, consisting of a temperature measuring sensor, a shrinkage measuring unit, an analog-to-digital converter, a computer, software, characterized in that it includes a thermopower measuring unit consisting of two metal electrodes immersed in the melt and software that allows interpretation computer data received.