SU1425220A1 - Installation for heat treatment of metal articles - Google Patents

Abstract

The invention relates to installations for the thermomechanical treatment of metals and alloys. The purpose of the invention is to increase the reliability, productivity and quality of processing. The installation includes a bath, a cooling system with pumps, an electrolyte sprayer, a vertically installed hollow stand for removal of electrolyte, a heating device made in the form of a rod mounted on the anode and cathode, on which a solenoid is mounted, a magnetic field device for controlling the operation of the installation connected to the solenoid and the cathode, a split screen, the upper part of which is fixed to the cathode, and the lower part - to the rack. The invention allows to improve the quality of processing, since the provision of the temperature of the product occurs with great precision using magnetic transformations, because The temperature of magnetic transformations does not depend on the heating rate. The reliability of the installation also increases. 1 hp f-ly, 2 ill. (Ls

Description

The invention relates to the thermal mechanical treatment of metals - alloys using electrolytic heating and is intended for the manufacture of products by cold machining of metal strip after softening annealing in electrolyte.

The aim of the invention is to increase the reliability5 of productivity and quality of processing.

Fig, 1 shows the installation5 longitudinal section; in fig. 2 - the same, | cross section. I The installation contains baths / 1 for electrolyte 5 heating device and cooling system., A magnetic flux device | 2 for automatically controlling the operation of the installation. The heating device includes an electric current source 3, the anode 4 and the cathodes which is inscribed in the form of a supporting rod 6 installed in the direction of 5, I With the help of a spring 7 with its lower part, the rod is pressed tightly to the strip from: Delia 8. A solenoid 9 is installed coaxially to the rod. It is designed to remove the rod 6 from the strip at the moment of rupture, the electric circuit AB and moving the processed part of the strip at a speed iJf to a new position,

 The cooling system contains pumps 10 and 11J additional bath 12 Storage tanks 13, connected to the spreaders 14; and retractor-ie, a view vertically placed in the bath 1 of a hollow rack 15o

The body of the vanes 1 is made in the shape of a truncated pyramid, which significantly expands to the base ;, on. which the anode 4 and the stand 15 are located. The area of the anodes should be much larger than the area of the heated part of the Strip,

The device 2 to create a magnetic flux is connected to the solenoid 9 and through the PMO 1 b with the rod 6,

On the rod 6 there is fixed a top screen 185 designed for protection of the top surface of the heated part of the strip from contact with the atmosphere of air. At the end of the rack 15, the lower 19 "screen is installed, made of heat and insulation insulation material and designed for the purpose of

strips} not subject to heating.

The installation works as follows.

in a way.

The article 8, preferably a strip, enters the bath 17 with the electrolyte along the guides 17.

) 3 fixed strip position

using a rod 6 (the latter is connected to the negative pole of the DC generator) and the circulation cooling system contacts the electrolyte of bath 1 (Fig. 1), the magnetic current flows through the magnetic conductor: the magnetic conductor turns on the RM 16 , a heated strip section and a magnetic flux device 2 for automatic control of plant operation.

The strip is the cathode and the anode, between which there is an electrolyte

and the product is heated. At this time, a certain magnetic flux circulates through the magnetic circuit.

At the moment when the magnetic properties of the heated part of the strip fall

up to a certain value or disappear altogether, the magnetic circuit CD is broken (FIG.), automatically turning on the solenoid 9 for removing the rod from the strip. In this case, an electric circuit AB breaks and switches on the strip cooling system - from pump 10 through accumulators 13 and. Sprayers 14 are supplied under pressure to the electrolyte strip on either side of the rack 15. Sprayer 14 leads the electrolyte jet to the very edge of the guide strip, which breaks the vapor film in the heating section to the screen 19. Simultaneously with the 1U pump, the pump 11, s

by means of which from the bath 1 the electrolyte is pumped into the additional tank 12, the indicated circulation system, being a system of periodic action, also provides a certain electrolyte temperature in the heating zone. Thus, one-sided heating of a certain part of the strip is carried out in a fixed position when it is

With the help of the rod 6 it is connected to the negative pole of the generator of direct current (not indicated in FIG. 1,2) and the circulatory system

3

4 comes into contact with the electrolyte bath 1.

Sufficiently uniform heating of the surface of the strip in contact with the electrolyte can lead to uneven cooling — and to some fluctuation in hardness at different points. The process of cooling products after heating in the electrolyte in the same electrolyte begins with film boiling, which can occur unevenly due to a sufficiently large surface of the cathode heated to a high temperature. For film boiling, the characteristic is that the heated surface is separated from the liquid (electrolyte with a film consisting of water vapor. Therefore, film boiling should be artificially interrupted by removing the vapor film from the surface of the product. This problem is solved film. The film’s electrolyte layer is progressively moving (from the velocity distribution plot in the layer, it can be seen that the maximum; our speed occurs for the liquid points located on the surface of the vapor strip), the surface flow of electrolyte disrupts the film and opens access of the electrolyte to the product.

The stability of the process is accomplished by preheating the strip, which is stationary relative to the electrolyte, by installing a periodic, poorly functioning device, which allows the process to be controlled and increases the reliability and reliability of the device. Stationary strip heating provides a uniform current density and heating along the entire surface in contact with the electrolyte, except for its edges, which are shielded. The provision of a given strip temperature occurs with great accuracy using magnetic transformations, since the temperature of magnetic transformation does not depend on the heating rate, the process of formation of new grains and other changes in the crystal structure of metals and alloys associated with their heat treatment, which improves the quality of the product. The sharp softening of the strip material after low-temperature heating in a short

five

from 0

five

0

five

0

five

0

a period of time and maintaining this state at room temperature can increase productivity and save energy.

In stamping, in most cases only the part of the metal under the stamp is used to make the product, and the rest of the metal may not be heat treated. Therefore, when electrolytic processing using the screen. The metal of the strip overlapped by the screen is not heated and is fed for processing in the heated state, which saves energy and improves the electrolytic heating process.

Thus, the proposed plant has increased reliability and stability of temperature regimes, which improves the quality of the products, electric (onomite material, eliminates waste products. Using this installation saves energy depending on the profile of the resulting product.

Claims (1)

Invention Formula 1, An apparatus for heat treatment of metal products, preferably strips, containing a bath with naprales, products, a heated device with an anode and a cathode j shield, an electrolyte circulation system with electrolyte supply and removal devices and a machining device characterized in that, in order to increase the reliability, productivity and quality of product processing, it is equipped with an installed coaxial one. anode by a solenoid and a magnetic field device to control the operation of the installation, connected with the solenoid and with the anode, which is located above the guides, while the electrolyte supply device is made in the form of sprayers, and the drain device - in the form of a hollow rack vertically installed in the bath under the guides, 2, Installation according to claim 1, the difference is that the screen is made detachable, its upper part is fixed to the cathode, and the lower part - to the hollow rack. II 5-jif /five fig 2