Gas-static extruder

FIELD: machine building.

SUBSTANCE: invention refers to equipment for treatment of items for industrial use out of discrete and solid materials at simultaneous or combined effect of high - to 500 MPa - pressure and temperature to 2000°C. The gas-static extruder consists of a power bed plate and container closed on ends, with upper and lower plugs, with a working chamber, connected with gas system of gas-static extruder, and with a heat insulating hood and heater arranged in it. Also, the gas-static extruder is equipped with a system of accelerated cooling installed in the heat insulating hood and elements of the heater system. The system is made in form of gas lines connected to an upper section of the working chamber of the container. The gas-static extruder is equipped with an ejector. It is also equipped with an additional cavity in the container, while the ejector is positioned in a lower cylinder part of the heat insulating hood and is made along whole perimetre of a lower part of the additional cavity of cooling.

EFFECT: facilitating motion of gas with sufficient high speed regardless to considerable resistance, also, facilitation of uniform accelerated cooling of work-pieces.

4 dwg

 

The invention relates to the field of equipment for hot isostatic pressing (CIP) of industrial products of discrete and continuous materials with simultaneous or combined exposure to high up to 500 MPa pressures and temperatures up to 2000°C, generated in a gaseous environment of the working chamber of Gazette.

The cycle of the ISU in relation to other ways of forming long-term, and depending on the technology and application cycle time is up to 24 hours, and in some cases, and more.

This time you need to perform these steps as vacuum and filling the chamber with gas, heating, holding phase, cooling and venting of gas.

While the Genesis of the technology of the workpiece are only heating up time and shutter speed. The injection of gas and heat by using a powerful compressors and heaters can be significantly accelerated. On the other hand, a significant cycle time of the ISU is the cooling of the working chamber and billets. When the furnace insulation inserts shall be so designed as to provide the most uniform temperature distribution in the loading chamber. On the other hand, it should not be too tight, otherwise the cooling will take a very long time, and this will reduce the performance of the process of the ISU. To solve this problem, beings who have so-called rapid cooling, where the heated gas is removed from the loading chamber method targeted circulation and cooling. However, the first generation of these systems had many disadvantages, namely a system of rapid cooling, which can significantly increase the performance of gotostate and improve the quality of processed products.

High speed cooling chamber gotostate can provide an opportunity to improve the properties of the products obtained by heat treatment while maintaining the fine grain structure of the material, to exclude subsequent heat treatment using diffusion annealing, and receive substantial economic effect.

Analogue of the invention is getstat with accelerated cooling system described in the book "Processes and equipment for gas-static treatment", GA Sergeant, A.D. Zverev, LU Maksimov, Moscow, metallurgy, 1994, str. Hatstat-similar device accelerated cooling by natural convection of gas through the built-in top tube heat exchanger and controlled valves located in the Luggage Gazette.

Device for the accelerated controlled cooling valves analogue, located inside the camera Gazette, built-in heat exchanger and natural convection g is designed for and used by the firm ASEA (Sweden). Schematic diagram of the operation of this device is as follows: the cap of the heating device of gotostate with lower loading of the firm ASEA is installed on the intermediate tube with the heater. In the upper part of the insulating cap has a hole in which is located a telescopic sleeve. The flange of the sleeve with the help of goods lever device mounted on the upper end of the cap is pressed against the flange of the graphite disk mounted on the lower surface of the upper tube. Between the tube and the disk provided by the channel connecting the cavity in the Central part of the disk space for the cap. Outside of the hood at the bottom of the cold side mounted valves, which open with the help of electromagnets. The top tube with reinforced vodopoglaschenie gas passages between it and the graphite disk forming a built-in heat exchanger. During heating and aging the workpiece at a given pressure and temperature valves are closed, and the circulation of gas from the working chamber of gotostate through the heat exchanger no. When opening valves hot gas from the working space through the hole in the top of the cap enters the heat exchanger, it is cooled and descends in the space outside of the hood. Next, the cooled gas flows through the open valves in the workspace. alrewas on the workpiece and cooling it, gas goes up and re-enters the heat exchanger.

Because such a device for accelerated cooling is optional and cooling of the container is designed only for normal heat sink in a heat-up time and shutter speed of the workpiece, to prevent overheating of the container due to the circulation of gas in accelerated cooling on its inner surface provided by the protective sleeve. Telescopic sleeve compensates for inaccuracies of manufacture of the cap and its deformation when heated.

The advantage of the considered devices for accelerated cooling is its simplicity; the disadvantage is the restriction of the possible velocities of the gas due to the small pressure drop in natural convection, the use of parts made of graphite restricts the use of such devices in the processing of products that require a high degree of purity of the working gas medium, since the graphite parts at high temperatures promote the formation of carbides on the surface of workpiece.

The prototype is getstat with a managed device in a uniform cooling of the firm "Pressure technology inc" (USA), described in the book "Processes and equipment for gas-static treatment", Gastrinomas, Addview, Loumakis, Moscow, metallurgy, 1994, str, equipped with valves, on th the mi-inside Gazette, built-in heat exchanger and forced convection gas.

Insulating hood of this device is installed on the base plate on the bottom of the tube gotostate top loading. The top tube container equipped with a water-cooled plate, in the centre of which is boring. In the bore installed insulated glass. The working of the heating chamber is in the form of a Cup with double wall and the flange. Removable cap insulating cap with screws attached to the flange of the Cup. In the Central portion of the removable cover cap made the hole where the pipe. This pipe with a gap enters cups water-cooled plate top tube container.

Between the heating chamber and insulating cap has a heater having multiple zones in height. Bottom heating chamber has a bottom heater. At the bottom of the outer wall of the heating chamber has a nozzle attached to a water-cooled bottom plate insulation. In the inner wall of the heating chamber openings are provided. The space within the heating chamber through these openings communicates with a space between its walls and then through the pipe with the pressure chamber of the centrifugal pump with adjustable speed, installed in the tube container.

In the base plate of the lower tube is provided, the gas input through the channels in the plate is connected to the space between the insulating cap and the container walls. Through these channels in the camera gotostate served working gas. In the base plate of the lower tube installed pistons with seals. The piston is fixed in the locking ring spring bottom plate. Podpisniye cavity in the base plate is connected to a separate gas input. In the absence of gas pressure in podporchenyj cavities of the piston under the pressure of the gas in the chamber gotostate moved down together with the locking ring hob. In the lower position of the locking ring plate is pressed against the copper ring gasket and closes communication between the gas input chamber Gazette and Luggage suction centrifugal pump. Before starting the cooling cycle gas input piston connected to the camera Gazette, and when the pressure above and below the piston are aligned, the locking plate under the action of springs rises above the annular gasket and connect camera suction centrifugal pump with the space between thermal insulating cover and the walls of the container.

The voltage to the motor of the centrifugal pump is supplied through the current leads of the lower tube. When turning on the motor of the centrifugal pump pumps cold gas iprostranstva between the insulating cap and the walls of the container through the nozzle into the space between the walls of the heating chamber. Through openings in the inner wall of the cold gas enters the chamber and cools the workpiece. The shape, number and location of holes in the inner wall of the heating chamber to prevent hypothermia blanks located at the bottom of the camera, and ensure uniform cooling. The heated gas enters the pipe insulation cover cap and then into the cavity insulated cups water-cooled plate top tube. Then gas through the gaps between the pipe and the glass enters the gap between the water-cooled plate and the cap insulating cap, being cooled, is moved to the container walls and falling down, entering the chamber suction centrifugal pump.

When heating and exposure of the workpiece, when the locking plate is pressed against the copper strip, the gas trap in the field of insulated cups water-cooled plate top tube prevents the cooled gas into the heating chamber. The upward movement of gas heated on the outer wall of the cap is prevented by a gas trap, made in the form of a skirt on the cover cap.

The benefits considered in the design of devices for accelerated cooling are: the possibility of motion of the gas with sufficiently high speed, despite significant resistance, as well as the opportunity for wide speed control of cooling through the use of a centrifugal pump with adjustable speed. The disadvantage of this device are some design difficulties associated with the placement of the pump chamber inner Gazette, as well as reducing its useful volume.

The technical result of the invention is to create a high-performance, reliable gotostate for processing of industrial products of discrete, solid materials of high (up to 500 MPa) pressure gas environment.

Achievable technical result:

- increase productivity and optimize gas drive of the machine, including the accelerated cooling system;

- improved maintainability and conditions of service of gotostate;

- improving the reliability of the gas system GetState, due to the lack of the camera moving parts, and as a result, high reliability and long service life;

- the use of an accelerated cooling system for retrofitting existing installations. Typically, this can be accomplished by replacing furnace inserts and insulation without affecting the useful volume of loading chamber;

- reducing the cycle time of the processing of the products in Gazette;

- improved performance of gotostate and reducing the cost of production;

- reduction of the temperature difference, when the accelerated cooling, managing the work within the relevant area of the heater.

The technical result is achieved by the fact that in the proposed system, the uniform rapid cooling at the end of phase exposure begins forced internal gas circulation by stimulating the circulation of ejectors arranged in the lower part of the insulating cap. For operation of the ejector does not need moving parts. He is driven by a gas under high pressure created by an external compressor. While the compressor works in a circular diagram, i.e. sucks the gas from the container and returns it back to drive the ejector. Inside the working space of the ejector sucks gas outside insulation and pumps it into the upper part of the container. Due to the high kinetic energy of the gas convective heat transfer occurs. This cold gas has a higher density than hot, and let the gas is primarily for insulating cap.

The flow of cold gas is gradually lowered and more mixed with the hot gas in the loading chamber. Top insulation hermetically closed, and the bottom there are side slits forming the ejectors, which contribute to the mixing of hot gas from the working area and cold gas the bottom of the container.

As top gas, bottom force must move the same number of g is at. However, this hot gas does not fall directly on the wall of the container and is mixed in the intermediate cavity insulation cap first with cold gas, and then cooled at navigating this cavity in the upper part of the insulating cap before going out to the cooled wall of the container. In the bottom area of the container is cooled by this method the gas is then absorbed by the ejector, and consequently supported the circulation. This rapid cooling can also be used for retrofitting existing installations. Typically, this can be accomplished by replacing furnace inserts and insulation without affecting the useful volume of the loading chamber.

The working chamber gotostate with this device is made in the form of a closed top insulating cap. Heaters installed in the space between the workpiece and the insulating cap. The device is equipped with an external heat exchanger, the gas circulation compressor and gas valves.

The design of the proposed gotostate represented by the following drawings, where

- figure 1 shows the actual getstat slit of the working chamber and accelerated cooling system;

on the figure 2 presents furnace insertion into the incision;

on the figure 3 presents the location And on the stove insert;

on figure as information material shows a system of accelerated cooling Gazette, selected as a prototype.

Getstat (figure 1) contains the power frame 1, the container 2 is closed on the ends of the upper 3 and lower 4 tubes, stove insert with accelerated cooling system 5, and a gas system 6. Gas system allows the high-pressure compressor 7 to operate in the mode of discharge into the container, and the suction from the container Gazette.

Getstat works as follows. In the initial position of the power base 1 is shifted from the axis of the container 2. On the lower tube 4 set the workpiece and the manipulator move it to the container. The power frame is mounted on the axis of the container. Then the container is filled with a working gas from the balloon station gas system (not shown)to equalize the pressure in them. Then the gas is a compressor with adjustable flow rate into the container to create the initial pressure in it. Turns on the heating system, heating the workpiece to the required temperature. At a given temperature and pressure, the workpiece is maintained within the required time. Then turns off the heating system, and the working chamber with the workpiece are cooled. For uniform accelerated cooling of the working chamber enters the compressor in a circular system, for injection of cold gas directly into the working chamber. Since SV is the Rhu village, it is gas, bottom force should move the same amount of gas. However, this hot gas does not fall directly on the wall of the tank and is mixed in the intermediate cavity insulation cap first with cold gas, and then cooled at navigating this cavity in the upper part of the insulating cap before going out to the cooled wall of the container. In the bottom area of the container is cooled by this method the gas is then absorbed by the ejectors 8, is conveyed into the intermediate cavity, and consequently supported the forced circulation of the gas.

The cooled gas through the system shut-off valve gas system, is discharged by gravity, and then is pumped by the compressor in the balloon station (not shown). The container 2 is connected with the atmosphere, the power frame 1 is shifted from the axis of the container, the lower tube 4 with the workpiece is extracted from it and the duty cycle of gotostate repeated.

Thus, the use of gas in the drive Gazette of an accelerated cooling system with side injectors for mixing hot and cold gas at high pressures allows you to create reliable and high-performance hatstat:

- due to the use of the rapid cooling cavity with ejectors located at the bottom of the cylindrical part of the insulating cap;

in the cut is ltate flow of cold gas in the upper part of the working chamber;

- by performing ejectors around the perimeter of the cavity cooling;

to improve maintainability and conditions of service gotostate due to the absence of moving parts in the fast cooling system;

to improve the performance of gotostate (5...6 times), resulting in the reduction of the working time cycle when the uniform rapid cooling of the working space and the processed products with speeds up to 100°C/min

Getstat containing power frame and the container, closed at the ends of the top and bottom tubes, with the working chamber, and connected with a gas system GetState, hosting the insulating cap and the heater, and hatstat has accelerated cooling system, located in the insulating cap and the elements of the system of the heater and made in the form of gas lines, which are connected with the upper part of the working chamber of the container, and the ejector, wherein getstat provided with an additional cavity in the container, and the ejector is placed in the lower cylindrical part of the insulating cap and performed around the perimeter of the lower part of the additional cavity cooling.



 

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