RU2605883C1 - Hardening medium cooling ability determining device - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention relates to steel and alloys thermal treatment and can be used in design of hardening media cooling capacity determining devices. Plant includes base with vertical post, tubular furnace, vessel with hardening medium and with hardening medium heater, heat flow probe, connected to computer, installed on vertical post said sensor transfer mechanism from tubular furnace into vessel with hardening medium and control system. At that, plant is equipped with movable table, installed on base, and heat flow sensor transfer mechanism is made in form of grip, installed on said post with possibility of vertical movement along it. Tubular furnace and vessel with hardening medium are arranged on said table with possibility of alternate arrangement under grip with heat flow sensor at table longitudinal movement along base relative to vertical post.

EFFECT: using invention allows to simplify plant design due to application of heat flow sensor plane-parallel transfer and simultaneously increase accuracy of its positioning.

1 cl, 1 dwg

Description

Installation for determining the cooling ability of the quenching medium.

The invention relates to the field of heat treatment of steel and alloys in order to increase their mechanical properties and can be used to build a register of liquids according to their cooling ability.

A device is known for determining the parameters of the cooling ability of quenching liquids, comprising a heater and a heat flux sensor with a thermocouple connected to a measuring device. The heat flow sensor, made with the cavity for the fluid flow motionless, is mounted in the heater, while the thermocouple is located inside the sensor (AS USSR No. 1057557, C21D 1/56, G01N 25/00, 11/30/1983).

The specified device has several disadvantages:

1) when changing quenching liquids, all containers and pipelines must be cleaned by pumping through them, for example, a solvent;

2) after a series of experiments, carbon deposits must be removed from the inner surface of the heat flux sensor;

3) the conditions of similarity in heat and mass transfer in natural and experimental processes are not observed;

4) the bulkiness and complexity of the device.

A device is known for determining the parameters of the cooling ability of quenching liquids, in which the heat flux sensor is stationary, the movable heater and the tank with the quenching medium are moved simultaneously and allow the heat flux sensor equipped with a thermocouple connected to the measuring device to pass through them (French patent No. 2080270, G01N 25/00, 12/12/1971).

A disadvantage of the analogue is the need to ensure reliable contact of the thermocouple junction with the heat flux sensor of additional devices that distort the temperature field of the sensor and cause a systematic error. In addition, the need for movement of the heater and capacity leads to the bulkiness and complexity of the design.

A device is known for determining the cooling ability of a quenching medium, comprising a base, a rod fixed on the base, a container with a quenching medium, over which a heater is installed, a heat flow sensor in which a thermocouple junction is fixed, thermoelectrodes of which are connected to temperature measuring and recording devices through a tubular leg , a system of pneumatic movement of the heat flow sensor (V. Lyuty. Hardening media. Reference book. Metallurgy. Chelyabinsk. 1990. 190 p. 48-50).

The disadvantage of this device is the bulkiness of the design and the complexity of the scheme. The circuit can only work if there is a central pneumatic system or compressor with associated devices and devices.

The closest in technical essence and the achieved result is an installation for monitoring the cooling ability of the quenching medium, containing a base with a vertical stand, a tubular furnace, a tank with a quenching medium, a quenching medium heater, an automatic control and control system, a mechanism for transferring a heat flow sensor from a tubular furnace to a tank with a quenching medium, made in the form of a triple hinged parallelogram, the first disk of which is fixedly mounted in the upper part of the vertical rack, and a heat flow sensor is attached to the second disk with the possibility of moving it in a vertical position along the trajectory in the form of an arc of a circle, the extreme points of which are located in the center of the heating zone of the tube furnace and in the center of the volume of the quenching medium, while one of the axes of the first disk of the triple hinged parallelogram mechanism is connected with the counterweight lever, which is used as the drive of the sensor transfer mechanism (RF patent No. 2279490, C21D 11/00, G01N 25/20, 07/10/2006).

The disadvantage of the installation is the complexity of the design, made in the form of a triple hinged parallelogram, with a counterweight as a drive of the transfer mechanism, which leads to a large number of hinges and moving parts and, as a result, reduces the rigidity of the system, durability and accuracy of positioning.

The objective of the invention is the reduction of overall dimensions, simplification of the design through the use of plane-parallel transfer.

The technical result is an increase in positioning accuracy.

The problem is solved, and the technical result is achieved by the installation for determining the cooling ability of the quenching medium containing a base with a vertical rack, a tubular furnace, a tank with a quenching medium and a quenching medium heater, a heat flux sensor connected to a computer, a vertical transfer mechanism mounted on a vertical rack a sensor from a tube furnace to a tank with a quenching medium and a control system, according to the invention, it is equipped with a movable table mounted on the base, fur the heat transfer sensor is carried out in the form of a gripper mounted on said stand with the possibility of vertical movement along it, while a tubular furnace and a quenching medium tank are located on the said table with the possibility of alternating placement under the said gripper with the heat flow sensor during longitudinal movement of the said table on the basis of a vertical rack.

Plane-parallel movements by moving in a vertical plane along the rack of the transfer mechanism of the heat flux sensor, made in the form of a grip, and longitudinal movement of the movable table, automatically transfer the heat flux sensor from the heating furnace to the tank with quenching medium for a strictly defined period of time.

The invention is illustrated in the drawing, which shows a schematic diagram of the installation.

The installation for determining the cooling ability of the quenching medium contains a movable table 1, on which there is a tubular furnace 2 and a container with a quenching medium 3, combined with a quenching medium heater, a control system 4, a heat flux sensor transfer mechanism, made in the form of a gripper 5, in which is fixed the heat flux sensor 6, with the ability to move along a vertical rack 7. The heat flux sensor 6 is connected to a personal computer 8. The movable table 1 is installed on the base 9.

Installation for determining the cooling ability of the quenching medium works as follows. The heat flux sensor 6, made in the form of a cylindrical sample of nickel alloy having a thermocouple in the geometric center, is heated in the tube furnace 2 to a certain temperature, then, on command from the control system 4, it is transferred by plane-parallel movements by the transfer mechanism of the heat flux sensor, made in the form of a capture 5, along the vertical strut 7 and the longitudinal movement of the movable table 1, so that in place of the tube furnace 2 there is a container with a quenching medium 3, into which the heat flow sensor will be immersed 6. Personal computer 8 registers, processes the cooling parameters of the heat flux sensor 6 and displays information on the monitor display: temperature-time and temperature-speed graphs, maximum cooling rate, temperature at maximum cooling rate, cooling rate at 300 ° C, cooling time to 600 ° C, 400 ° C, 200 ° C.

So, the use of plane-parallel transfer allows us to reduce overall dimensions and simplify the design and improve the accuracy of the positioning of the installation to control the cooling ability of the quenching medium.

Claims (1)

Installation for determining the cooling ability of the quenching medium, containing a base with a vertical stand, a tubular furnace, a tank with a quenching medium and a quenching heater, a heat flow sensor connected to a computer, a vertical transfer mechanism for transferring the said sensor from a tube furnace to a quenching tank medium and control system, characterized in that it is equipped with a movable table mounted on the base, the transfer mechanism of the heat flux sensor is made in the form of a capture, mouth mounted on said rack with the possibility of vertical movement along it, while the tubular furnace and the tank with the quenching medium are located on the said table with the possibility of alternating placement under said gripper with a heat flux sensor during longitudinal movement of the said table along the base relative to the vertical rack.

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