CN110116148B - Positive pressure creep leveling furnace - Google Patents
Positive pressure creep leveling furnace Download PDFInfo
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- CN110116148B CN110116148B CN201910495723.6A CN201910495723A CN110116148B CN 110116148 B CN110116148 B CN 110116148B CN 201910495723 A CN201910495723 A CN 201910495723A CN 110116148 B CN110116148 B CN 110116148B
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- 230000007246 mechanism Effects 0.000 claims abstract description 53
- 239000010935 stainless steel Substances 0.000 claims abstract description 42
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 42
- 238000005266 casting Methods 0.000 claims abstract description 8
- 238000005485 electric heating Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 44
- 238000009413 insulation Methods 0.000 claims description 18
- 239000011449 brick Substances 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000003475 lamination Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910052902 vermiculite Inorganic materials 0.000 description 3
- 235000019354 vermiculite Nutrition 0.000 description 3
- 239000010455 vermiculite Substances 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/007—Cooling of charges therein
- F27D2009/0072—Cooling of charges therein the cooling medium being a gas
- F27D2009/0075—Cooling of charges therein the cooling medium being a gas in direct contact with the charge
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
A press frame is arranged above a base, a movable lower furnace body is arranged on the base, an upper furnace body fixed below a movable beam is arranged above the lower furnace body, a descending mechanism arranged above the upper beam of the press frame is suspended below the upper beam of the press frame, and the descending mechanism drives the movable beam to move up and down so as to open or close the upper furnace body and the lower furnace body; a casting platform, a heat-resistant layer and a stainless steel flat plate are arranged in the furnace chamber of the lower furnace body from bottom to top; an electric heating body is arranged on the inner side wall of the upper furnace body, a pressure bag is arranged in the furnace chamber of the upper furnace body, the pressure bag is fixed in a rectangular cavity seat, the upper end of the rectangular cavity seat is connected with an air charging pipeline of which the tail end is provided with an air charging valve, and the pressure bag is suspended in the furnace chamber of the upper furnace body through a descending mechanism above the movable cross beam; the pressure reducing mechanism drives the pressure bag to move downwards, so that the lower end face of the pressure bag contacts with the upper end face of the blank, and then the high-pressure air source is connected with the air charging valve to charge 1-8 atmospheres to the pressure bag to uniformly apply positive pressure to the blank from top to bottom.
Description
Technical Field
The invention belongs to the technical field of titanium and titanium alloy plate processing, and particularly relates to a positive pressure creep leveling furnace.
Background
The conventional leveling methods for titanium and titanium alloy plates are of two main types: the first is waste heat leveling, namely stacking hot materials according to a certain rule, pressing weights on the hot materials, leveling the plates by using waste heat and gravity, and the leveling accuracy of the method is lower. The other type is that the vacuum creep furnace is leveled, and the leveling is performed in a heating state by forming a correction pressure by the pressure difference generated by the vacuum and the atmospheric pressure in the furnace.
The vacuum creep leveling furnace has the inherent defects that: 1. the vacuum degree formed in the furnace is only 0.5 atmosphere, the creep deformation correction pressure acting on the sheet pile through the soft furnace cover is small (about 0.5 ton/square meter), so that the creep heat preservation time is prolonged to compensate for the small creep deformation correction pressure, and the production period is long. Under the condition that the thickness of the plate material is large or the total thickness of the plate material with more layers is large, the correction pressure is more insufficient. The maximum stack thickness was 150 mm. 2. The bottom platform of the vacuum creep furnace is provided with a heating body, and heat is transferred to materials through thick refractory bricks, so that the heat transfer efficiency is low, the structure of the platform is complex, and the manufacturing cost is high; 3. the vacuum degree in the furnace chamber of the vacuum creep furnace is low (only about 0.5 atmosphere), and the plate is oxidized to a certain extent. 4. The furnace chamber and bottom platform has large volume, large heat capacity and long heating and cooling time, and the production period is prolonged; the thickness of the laminated plate material of the equipment is about 150 mm, and about 6-8 stacks can be stacked at the same time. When small batches or specifications are mixed, the small batches or specifications are not placed into a furnace, and the small batches or specifications are waiting for batch assembly and the period is forced to be prolonged; 5. the soft furnace cover on the furnace is generally composed of a thin steel plate, a heat insulation layer of vermiculite powder, a film and the like, a large amount of vermiculite powder is filled and cleaned, dust is large, and the working environment of workers is poor.
Disclosure of Invention
The invention provides a positive pressure creep leveling furnace, which overcomes the defects of the prior art, improves the quality and production efficiency of products, improves the operating environment and shortens the production period.
The invention adopts the technical scheme that: the positive pressure creep leveling furnace comprises a base, wherein a press frame is arranged above the base, a movable lower furnace body is arranged on the base, an upper furnace body is arranged above the lower furnace body and is fixed below a movable cross beam, the movable cross beam is suspended below the upper cross beam of the press frame through a first lifting mechanism arranged above the upper cross beam of the press frame, and the first lifting mechanism drives the movable cross beam to move up and down so as to enable the upper furnace body and the lower furnace body to be opened or closed; a casting platform, a heat-resistant layer and a stainless steel flat plate are arranged in the furnace chamber of the lower furnace body from bottom to top; an electric heating body is arranged on the inner side wall of the upper furnace body, and a stainless steel pressure bag is arranged in the furnace chamber; the stainless steel pressure bag is of a rectangular cavity structure and is fixed in a rectangular cavity seat above the stainless steel pressure bag, the upper end of the rectangular cavity seat is connected with an air inflation pipeline I communicated with the stainless steel pressure bag cavity, and the air inflation pipeline I sequentially passes through the upper furnace body, the top of the movable cross beam and the rear end of the upper cross beam of the press frame; the upper end of the rectangular cavity seat is suspended in the furnace chamber of the upper furnace body through a second lifting mechanism which passes through the top of the upper furnace body and is arranged above the movable cross beam; the second lifting mechanism drives the rectangular cavity seat to move downwards, so that after the lower end face of the stainless steel pressure bag is contacted with the upper end face of the blank, the stainless steel pressure bag is connected with a high-pressure air source through an air charging valve I to charge 1-8 atmospheres to the stainless steel pressure bag, and positive pressure is uniformly applied to the blank from top to bottom.
An air cooling pipeline is arranged in the casting platform and is connected with a first cooling fan; the heat-resistant layer is formed by paving refractory bricks, and the stainless steel flat plate is paved on the heat-resistant layer; and the two sides of the upper furnace body are provided with heat-resistant fans which can blow air into the furnace chamber.
The second lifting mechanism is connected by eight groups of air pressure lifting mechanisms through an air charging pipeline II, and the tail end of the air charging pipeline II is communicated with a high-pressure air source through an air charging valve II; the eight groups of air pressure lifting mechanisms are symmetrically fixed above the movable cross beam in front-back mode, and the lower ends of piston rods of the eight groups of air pressure lifting mechanisms sequentially penetrate through the movable cross beam and through holes in the top of the upper furnace body and are fixedly connected to the upper ends of the rectangular cavity seats; the lower end of the piston rod is provided with a T-shaped cooling air channel, eight piston rods of the eight groups of air pressure lifting mechanisms are respectively sleeved with a shrinkable heat insulation sleeve, the upper ends of the shrinkable heat insulation sleeves are fixedly connected with the lower end face of the movable cross beam, the lower ends of the shrinkable heat insulation sleeves are fixedly connected with the upper ends of the rectangular cavity seats, an axial cooling air channel is formed between the piston rods and the shrinkable heat insulation sleeves, the rectangular cavity seats are internally provided with labyrinth type cooling air channels, the axial cooling air channels are communicated with the labyrinth type cooling air channels at the lower ends through the T-shaped cooling air channels, the upper ends of the eight axial cooling air channels are communicated with a high-pressure air source through an air charging pipeline III, the tail ends of the air charging pipeline III are provided with air charging valves III, and the labyrinth type cooling air channels are communicated with an exhaust pipe positioned in the center of the rectangular cavity seats.
The stainless steel pressure bag is characterized in that a heat insulation layer is arranged on the inner wall of the lower end face of the stainless steel pressure bag, and heat insulation cotton is filled in the heat insulation layer.
The first lifting mechanism is a synchronous lifting screw mechanism and is formed by connecting four groups of screw lifting mechanisms, three gear boxes and a motor; the four groups of screw rod lifting mechanisms are symmetrically fixed above the upper cross beam of the press frame, the lower ends of the screw rods penetrate through the through holes of the upper cross beam of the press frame and are connected with four corners of the movable cross beam in a threaded mode, and the movable cross beam reciprocates along the screw rods.
The blank is positioned in a vacuum bag, the vacuum bag is a rectangular container made of stainless steel plates, the length and width dimensions are slightly larger than those of the blank, the height is slightly larger than the height of the blank lamination, and the vacuum bag is vacuumized and filled with argon after the blank lamination is filled in the vacuum bag.
The lower end of the lower furnace body is fixed on a rail car, and the rail car reciprocates along a rail; the track comprises an adjustable section and a fixed section, wherein the adjustable section is used for lifting the height through a hydraulic jack with the lower end fixed.
And observation windows are arranged at two ends of the upper furnace body.
Compared with the prior art, the invention has the advantages and effects that:
1. the furnace bottom platform adopts a composite structure and consists of a metal casting platform, refractory bricks and a stainless steel flat plate. The metal casting platform is machined, so that flatness is guaranteed, and a flat reference is arranged on the refractory bricks. A layer of stainless steel flat plate (about 10 mm) is paved on the refractory bricks to serve as a reference plane, the stainless steel flat plate also plays a role in protecting the refractory bricks, and is convenient to clean and correct the reference plane, so that the operating environment is improved, and the quality of products is ensured.
2. The furnace chamber adopts an up-down closed structure, and is convenient to load and unload. And the electric heating wires are arranged on the side wall in the upper furnace chamber, so that the electric heating furnace is reasonable in layout and convenient to maintain. When the temperature is raised, the heating body directly transfers heat to the blank, the heat transfer is fast, and then the fans arranged on the two sides of the upper furnace chamber circulate the air in the furnace chamber, so that the temperature around the blank is uniform, and the quality of products is improved.
3. An important reason for the long production cycle of the prior art is the long cooling time, which is about 72 hours for the prior creep furnace. When the temperature is reduced, the pressure bag is separated from the blank, so that the upper surface of the blank is a radiating surface (a layer of thick vermiculite powder heat insulation material is arranged on the original creep furnace blank); circulating air in the furnace chamber through fans arranged on two sides of the upper furnace chamber, and forced air cooling the blank to accelerate the cooling speed of the blank; in addition, cold air is blown into the longitudinal holes in the casting platform, so that heat exchange under the blank is accelerated; through the comprehensive cooling measures, the cooling time is shortened by more than half compared with the prior creep furnace, and the production period is shortened.
4. When the blank is leveled, the blank is pressurized by the pressure bag, and the pressure of the pressure bag can be designed and adjusted according to the requirement. If the thickness of the lamination of the new equipment blank reaches 900 mm, the charging quantity is equivalent to that of the original equipment, the production period is shortened, and the production efficiency is improved.
5. The material of the invention is only put in one stack, and can be produced in a furnace when the amount of the material to be treated is small.
6. The blank is pressed by the pressure bag, so that the pressure is uniform, and the quality of the product is ensured.
7. The pressure bag base and the force bearing rod are provided with the air cooling channels, so that the pressure bag base and the force bearing rod maintain lower temperature when the temperature in the furnace is raised, and the pressure bag base and the force bearing rod are ensured to have enough rigidity.
Drawings
FIG. 1 is a front elevational view of the structure of the present invention;
FIG. 2 is a side view of the structure of the present invention;
FIG. 3 is a schematic view of the structure of the hearth platform of the present invention;
FIG. 4 is a schematic view of the stainless steel pressure pack structure of the present invention;
FIG. 5 is a schematic view of the vacuum bag structure of the present invention;
FIG. 6 is a schematic diagram of the upper furnace synchronous lifting mechanism of the present invention.
Detailed Description
The invention will now be described in detail with reference to figures 1-6 and the detailed description.
Positive pressure creep leveling furnace: the device comprises a base 1, wherein a press frame 2 is arranged above the base 1, a movable lower furnace body 3 is arranged on the base 1, an upper furnace body 4 is arranged above the lower furnace body 3, and the upper furnace body 4 is fixed below a movable cross beam 12; the movable cross beam 12 is suspended on the press frame 2 through a first lifting mechanism 5 arranged above the press frame 2; the first lifting mechanism 5 drives the movable cross beam 12 to move up and down so as to open or close the upper furnace body 4 and the lower furnace body 3; a casting platform 6, a heat-resistant layer 7 and a stainless steel flat plate 8 are arranged in the furnace chamber of the lower furnace body 3 from bottom to top; an electric heating body 9 is arranged on the inner side wall of the upper furnace body 4, and a stainless steel pressure bag 10 is arranged in the furnace chamber; the stainless steel pressure bag 10 is of a rectangular cavity structure and is fixed in a rectangular cavity seat 11 above the stainless steel pressure bag; the upper end of the rectangular cavity seat 11 is connected with an air inflation pipeline I13 communicated with the cavity of the stainless steel pressure bag 10, and the air inflation pipeline I13 sequentially passes through the upper furnace body 4, the top of the movable cross beam 12 and the rear end of the upper cross beam of the pressure frame 2 upwards to form an air inflation valve 14; the upper end of the rectangular cavity seat 11 is suspended in the furnace chamber of the upper furnace body 4 through a second lifting mechanism 26 which passes through the top of the upper furnace body 4 and is arranged above the movable cross beam 12; the second lifting mechanism 26 drives the rectangular cavity seat 11 to move downwards, so that after the lower end face of the stainless steel pressure bag 10 contacts with the upper end face of the blank 15, the stainless steel pressure bag 10 is connected with a high-pressure air source through the air charging valve I14 to charge compressed air with 1-8 atmospheres, and positive pressure is uniformly applied to the blank 15 from top to bottom by the stainless steel pressure bag.
An air cooling pipeline 16 is arranged in the casting platform 6, and the air cooling pipeline 16 is connected with a first cooling fan 17; the heat-resistant layer 7 is formed by paving refractory bricks, and a stainless steel flat plate 8 is paved on the refractory bricks; the two sides of the upper furnace body 4 are provided with heat-resistant fans 19 which can blow air into the furnace chamber.
The second lifting mechanism 26 is connected by eight groups of air pressure lifting mechanisms 37 through an air charging pipeline II 31, and the tail end of the air charging pipeline II 31 is communicated with a high-pressure air source through an air charging valve II 33; the eight groups of air pressure lifting mechanisms 37 are symmetrically fixed above the movable cross beam 12, and the lower ends of the piston rods of the eight groups of air pressure lifting mechanisms pass through the movable cross beam 12 and the through holes at the top of the upper furnace body 4 in sequence and are fixedly connected to the upper ends of the rectangular cavity seats 11; the lower ends of the piston rods are provided with T-shaped cooling air channels 24, the eight piston rods of the eight groups of air pressure lifting mechanisms 37 are respectively sleeved with a shrinkable heat insulation sleeve 27, the upper ends of the shrinkable heat insulation sleeves 27 are fixedly connected with the lower end faces of the movable cross beams 12, the lower ends of the shrinkable heat insulation sleeves 27 are fixedly connected with the upper ends of the rectangular cavity seats 11, and an axial cooling air channel 22 is formed between each piston rod and each shrinkable heat insulation sleeve 27; the rectangular cavity seat 11 is internally provided with a labyrinth cooling air duct 23, the axial cooling air duct 22 is communicated with the labyrinth cooling air duct 23 at the lower end through a T-shaped cooling air duct 24, the upper ends of the eight axial cooling air ducts 22 are communicated with a high-pressure air source through an air charging pipeline III 32, the tail end of the air charging pipeline III 32 is provided with an air charging valve 34, and the labyrinth cooling air duct 23 is communicated with an exhaust pipe 35 positioned in the center of the rectangular cavity seat 11. The air valve II 33 controls the air pressure lifting mechanism 37 to move up and down.
The inner wall of the lower end surface of the stainless steel pressure bag 10 is provided with a heat insulation layer 10-1, and heat insulation cotton is filled in the heat insulation layer 10-1.
The first lifting mechanism 5 is a synchronous lifting screw mechanism and is formed by connecting four groups of screw lifting mechanisms 20, three gear boxes 21 and a motor 25; the four groups of screw rod lifting mechanisms 20 are symmetrically fixed above the upper beam of the furnace frame 2 in front-back mode, the lower ends of screw rods of the four groups of screw rod lifting mechanisms penetrate through holes of the upper beam of the furnace frame 2 and are connected with four corners of the movable beam 12 in a threaded mode, and the movable beam 12 moves back and forth along the screw rods.
The blank 15 is located in a vacuum bag, the vacuum bag is a rectangular container made of stainless steel plates, the length and width dimensions are slightly larger than those of the blank 15, the height is slightly larger than the height of the blank 15 laminated layers, the vacuum bag is filled with the blank 15 laminated layers, vacuum is carried out through vacuum packaging welding, argon is filled, and then vacuum is carried out, so that air residues are reduced as much as possible.
The lower end of the lower furnace body 3 is fixed on a rail car 28, and the rail car 28 reciprocates along a rail 29; the rail 29 is composed of an adjustable section 29-1 and a fixed section 29-2, and the adjustable section 29-1 is lifted by a hydraulic jack 30 fixed at the lower end thereof.
And observation windows 36 are arranged at two ends of the upper furnace body 4.
The working process comprises the following steps: firstly, a first lifting mechanism 5 is started to drive a movable cross beam 12 to move upwards, so that an upper furnace body 4 fixed at the lower end moves upwards, and a vacuum bag 15 (if a plate with oxide skin is used, the plate can be directly placed on a stainless steel plate 8 without the vacuum bag) is stacked on the stainless steel plate 8; starting the first lifting mechanism 5 to drive the movable cross beam 12 to move downwards, so that the upper furnace body 4 fixed at the lower end moves downwards, and the lower end surface of the upper furnace body 4 and the upper end surface of the lower furnace body 3 are closed; the electric heating body 9 (heating wire) is started to heat the blank 15, and the heat-resistant fan 19 is started to blow and accelerate the hot air circulation in the furnace chamber, so that the temperature in the furnace chamber is uniform. Opening the inflation valve III 34 cools the piston rod of the second lifting mechanism 26 and the rectangular cavity seat 11 of the pressure bag 10. The temperature in the furnace exceeds 600 ℃, and the heat-resistant fan 19 stops working; when the temperature rises to 650 ℃, the heat preservation stage is carried out for 4-8 hours, and the whole temperature (particularly the core part) of the blank 15 is ensured to reach 650 ℃. Then, the second lifting mechanism 26 is controlled by the inflation valve II 33 to drive the pressure bag 10 to move downwards, so that the lower end surface of the pressure bag 10 is closely attached to the top surface of the blank 15, and the air cylinder 37 is pressurized by the installation process. At the beginning of the creep stage, the pressure bag 10 is connected with a high-pressure air source through the air charging valve I14 to charge compressed air into the pressure bag 10, the pressure bag 10 is externally pressed from low pressure to high pressure according to preset pressure, and positive pressure is uniformly applied to the blank 15 from top to bottom; the height of the blank is observed to be lowered, and the height of the rectangular cavity seat 11 is adjusted by the second lifting mechanism 26. At the end of the creep period, the heating is stopped and the pressure of the pressure pack 10 is maintained. The heat-resistant fan 19 and the first cooling fan 17 are started to cool the furnace body and the blank; when the temperature is reduced to 300 ℃, the pressure bag 10 is depressurized, the second lifting mechanism 26 is controlled by the inflation valve II 33 to move the rectangular cavity seat 11 upwards, and the pressure bag 10 is separated from the blank 15. When the temperature in the furnace chamber is reduced to below 150 ℃, the upper furnace body moves upwards, the heat-resistant fan 19 stops, and the charging valve III 34 is closed. The skip 28 is actuated to remove the leveled blank 15. After the surface temperature of the blank is reduced to 50 ℃ by the action of the first cooling fan 17 and natural cooling, the first cooling fan 17 stops, and the vacuum bag is lifted to another place for opening the vacuum bag.
The blanks with the surface allowing oxidation can be directly stacked on a furnace bottom platform for leveling. And the blank which does not allow oxidation is placed in a vacuum bag, argon is filled when the blank is pumped out to 1Pa (the atmospheric pressure can be up to 0.2), then the blank is pumped out to 1Pa, the exhaust pipe is sealed, and then the vacuum bag is placed on a furnace bottom platform for leveling, so that the blank is not oxidized in the creep process. The vacuum bag is a rectangular container made of stainless steel thin plates, the length and width dimensions of the vacuum bag are slightly larger than those of the blanks 15, and the height of the vacuum bag is slightly larger than the height of the stacks of the blanks 15.
The invention applies pressure to the blank through the pressure bag, and heats the blank at the same time, and the blank is subject to creep under the action of temperature and pressure, thereby achieving the purposes of leveling and removing residual stress. The composite structure for the furnace bottom platform ensures that the integral flatness of the furnace bottom plane is less than or equal to 0.5 mm/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Thicker blanks can be leveled due to the applied positive pressure; the external pressure is uniformly applied to the blank through the pressure bag, so that the blank is flexibly applied and uniformly stressed; and the ventilation facility is arranged, so that the temperature in the furnace is uniform, the temperature rise is quick, the cooling and heat dissipation are also quick, and the production period is shortened; the quality and the production efficiency of the product are improved.
The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention, so that all equivalent modifications made by the appended claims shall be included in the scope of the present invention.
Claims (8)
1. The utility model provides a malleation creep correction stove, includes base (1), its characterized in that: a press frame (2) is arranged above the base (1), a movable lower furnace body (3) is arranged on the base (1), an upper furnace body (4) is arranged above the lower furnace body (3), the upper furnace body (4) is fixed below a movable cross beam (12), the movable cross beam (12) is suspended below the upper cross beam of the press frame (2) through a first lifting mechanism (5) arranged above the upper cross beam of the press frame (2), and the first lifting mechanism (5) drives the movable cross beam (12) to move up and down so as to open or close the upper furnace body (4) and the lower furnace body (3); a casting platform (6), a heat-resistant layer (7) and a stainless steel flat plate (8) are arranged in the furnace chamber of the lower furnace body (3) from bottom to top; an electric heating body (9) is arranged on the inner side wall of the upper furnace body (4), and a stainless steel pressure bag (10) is arranged in the furnace chamber; the stainless steel pressure bag (10) is of a rectangular cavity structure and is fixed in a rectangular cavity seat (11) above the stainless steel pressure bag, an air charging pipeline I (13) communicated with the cavity of the stainless steel pressure bag (10) is connected to the upper end of the rectangular cavity seat (11), and the air charging pipeline I (13) sequentially passes through the upper furnace body (4), the top of the movable cross beam (12) and the rear end of the upper cross beam of the pressure frame (2) upwards, and an air charging valve I (14) is arranged at the rear end of the upper cross beam of the pressure frame (2); the upper end of the rectangular cavity seat (11) is suspended in the furnace chamber of the upper furnace body (4) through a second lifting mechanism (26) which passes through the top of the upper furnace body (4) and is arranged above the movable cross beam (12); the second lifting mechanism (26) drives the rectangular cavity seat (11) to move downwards, so that after the lower end face of the stainless steel pressure bag (10) is contacted with the upper end face of the blank (15), the stainless steel pressure bag (10) is connected with a high-pressure air source through the air charging valve I (14) to charge 1-8 atmospheres to uniformly apply positive pressure to the blank (15) from top to bottom.
2. The positive pressure creep leveling furnace according to claim 1, wherein: an air cooling pipeline (16) is arranged in the casting platform (6), and the air cooling pipeline (16) is connected with a first cooling fan (17); the heat-resistant layer (7) is formed by paving refractory bricks, and the stainless steel flat plate (8) is paved on the heat-resistant layer; two sides of the upper furnace body (4) are provided with heat-resistant fans (19) which can blow air into the furnace chamber.
3. A positive pressure creep leveling furnace according to claim 1 or 2, characterized in that: the second lifting mechanism (26) is connected by eight groups of air pressure lifting mechanisms (37) through an air charging pipeline II (31), and the tail end of the air charging pipeline II (31) is communicated with a high-pressure air source through an air charging valve II (33); the eight groups of air pressure lifting mechanisms (37) are symmetrically fixed above the movable cross beam (12) from front to back, and the lower ends of the piston rods of the eight groups of air pressure lifting mechanisms sequentially penetrate through the movable cross beam (12) and the through holes at the top of the upper furnace body (4) and are fixedly connected to the upper ends of the rectangular cavity seats (11); the piston rod lower extreme is equipped with T type cooling air duct (24), the last shrink insulating sheath (27) that is equipped with respectively of eight groups pneumatic lifting mechanism's (37) eight piston rods, but shrink insulating sheath (27) upper end and movable cross beam (12) lower terminal surface fixed connection, but shrink insulating sheath (27) lower extreme and the upper end fixed connection of rectangle cavity seat (11), form axial cooling air duct (22) between piston rod and the shrink insulating sheath (27), have maze type cooling air duct (23) in rectangle cavity seat (11), axial cooling air duct (22) link up with maze type cooling air duct (23) of lower extreme through T type cooling air duct (24), and the upper end of eight axial cooling air duct (22) is through inflation line III (32) and high pressure air supply intercommunication, and inflation valve III (34) are equipped with at inflation line III (32) end, and maze type cooling air duct (23) are linked together with blast pipe (35) that are located rectangle cavity seat (11) central authorities.
4. A positive pressure creep leveling furnace according to claim 3, wherein: the stainless steel pressure bag is characterized in that a heat insulation layer (10-1) is arranged on the inner wall of the lower end face of the stainless steel pressure bag (10), and heat insulation cotton is filled in the heat insulation layer (10-1).
5. The positive pressure creep leveling furnace according to claim 4, wherein: the first lifting mechanism (5) is a synchronous lifting screw mechanism and is formed by connecting four groups of screw lifting mechanisms (20), three gear boxes (21) and a motor (25); the four groups of screw rod lifting mechanisms (20) are symmetrically fixed above the upper cross beam of the press frame (2) from front to back, the lower ends of screw rods of the four groups of screw rod lifting mechanisms penetrate through holes of the upper cross beam of the press frame (2) and are connected with four corners of the movable cross beam (12) in a threaded mode, and the movable cross beam (12) moves back and forth along the screw rods.
6. The positive pressure creep leveling furnace according to claim 5, wherein: the blank (15) is positioned in a vacuum bag, the vacuum bag is a rectangular container made of stainless steel plates, the length and width dimensions are slightly larger than those of the blank (15), the height is slightly larger than the height of the stack of the blanks (15), and the vacuum bag is vacuumized and filled with argon after the stack of the blanks (15) is filled in the vacuum bag.
7. The positive pressure creep leveling furnace of claim 6, wherein: the lower end of the lower furnace body (3) is fixed on a rail car (28), and the rail car (28) reciprocates along a rail (29); the track (29) is composed of an adjustable section (29-1) and a fixed section (29-2), and the adjustable section (29-1) is lifted by a hydraulic jack (30) with the lower end fixed.
8. The positive pressure creep leveling furnace of claim 7, wherein: and observation windows (36) are arranged at two ends of the upper furnace body (4).
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