CN114959205B - Process method for bidirectional heat treatment of metal plate strip - Google Patents
Process method for bidirectional heat treatment of metal plate strip Download PDFInfo
- Publication number
- CN114959205B CN114959205B CN202210524773.4A CN202210524773A CN114959205B CN 114959205 B CN114959205 B CN 114959205B CN 202210524773 A CN202210524773 A CN 202210524773A CN 114959205 B CN114959205 B CN 114959205B
- Authority
- CN
- China
- Prior art keywords
- pressure cooling
- cooling area
- plate strip
- low
- nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
Abstract
The invention belongs to the technical field of heat treatment of metal plates and strips, and particularly relates to a process method for bidirectional heat treatment of metal plates and strips. The technological method for the bidirectional heat treatment of the metal plate strip comprises the steps of S1, heating a forward quenching plate strip; s2, cooling the forward quenching plate strip and heating the reverse quenching plate strip; s3, conveying out the forward quenching plate strip; s4, cooling the reverse quenching plate strip; and S5, conveying out the reverse quenching plate strip. Therefore, the process method for the bidirectional heat treatment of the metal plate strip can be used for forward and reverse production, realizes the purposes of improving the utilization rate of the roller type quenching machine and improving the quality and the efficiency of the heat treatment line.
Description
Technical Field
The invention belongs to the technical field of heat treatment of metal plates and strips, and particularly relates to a technological method for bidirectional heat treatment of metal plates and strips.
Background
The roller type quenching machine has strong cooling capacity, uniform cooling, high production efficiency, good plate shape of the cooled plate strip, no limitation of the length of the plate strip on the length of the equipment, continuous production, and can be used for the requirements of the production processes of quenching, solid solution, controlled cooling and the like of the metal plate strips of carbon steel, stainless steel, special alloy, titanium alloy, aluminum alloy and the like, and is a main cooling equipment form of a large-scale heat treatment line. The roller hearth type heat treatment furnace and the external mechanical furnace are main heating equipment of a heat treatment line, the thickness range of plate and strip production is 4-300 mm, the width range is 1-5 m, and the length range is 3-30 m, for the plate and strip production with the thickness of 4-40 mm, the equipment configuration form of the roller hearth type heat treatment furnace and a roller type quenching machine can be adopted, the plate and strip are heated in the roller hearth type heat treatment furnace, then are moved out of the heat treatment furnace, and are conveyed to the roller type quenching machine by a roller way for continuous quenching; for the cooling of the plate with the thickness of 40-300 mm, an equipment configuration form of an external mechanical furnace and a roller quenching machine can be adopted, and the plate and the strip are heated in the external mechanical furnace, then are transported out of the external mechanical furnace by an external mechanical arm, and are conveyed to the roller quenching machine by a roller way for continuous quenching.
The conventional roller type quenching machine consists of a high-pressure cooling section and a low-pressure cooling section, a plate and strip material is cooled at a high cooling speed in the high-pressure cooling section, a large temperature gradient is formed in the thickness direction, and the plate and strip material is continuously cooled in the low-pressure cooling section to reach the target final cooling temperature. However, the production efficiency of the heating furnace is about 1/3-1/2 of that of the roller quenching machine, and the conventional roller quenching machine cannot meet the requirement that the sheet and strip enter from a low-pressure cooling section at the rear part of the roller quenching machine, so that the asynchronization of the production efficiency of the heating furnace and the cooling equipment becomes a main factor for restricting the production efficiency of a heat treatment line.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a process method for the bidirectional heat treatment of metal plates and strips, and the metal plates and strips can enter a roller type quenching device for cooling from the front part and the rear part of the roller type quenching device after being heated, so that the technical problem that the production efficiency of a heating furnace of a heat treatment line is about 1/3-1/2 of that of a roller type quenching machine, and the production efficiency of the heat treatment line is restricted is solved.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides a process method for bidirectional heat treatment of a metal plate strip, which comprises the following steps: s1, heating a forward quenching plate strip: heating the forward quenching plate strip in a roller hearth type heat treatment furnace;
s2, cooling the forward quenching sheet strip and heating the reverse quenching sheet strip: after the forward quenching plate and strip in the S1 is heated to the process temperature, the forward quenching plate and strip enters a high-pressure cooling area at the head of the quenching device, and is sequentially cooled by the high-pressure cooling area and a low-pressure cooling area in the middle, and meanwhile, the reverse quenching plate and strip is heated in an external mechanized furnace;
s3, conveying out the forward quenching plate strip: conveying the forward quenching plate strip cooled in the step S2 out of a medium-pressure cooling area at the tail part of the quenching device;
s4, cooling the reverse quenching plate strip: after the reverse quenching plate and strip in the S2 is heated to the process temperature, the reverse quenching plate and strip enters a medium-pressure cooling area at the tail part of the quenching device and is sequentially cooled by the medium-pressure cooling area and a low-pressure cooling area in the middle part;
s5, conveying out the reverse quenching plate strip: and (4) conveying the reverse quenching plate strip cooled in the step (S4) out of a medium-pressure cooling area at the tail part of the quenching device.
Further, the high-pressure cooling area is provided with a high-pressure cooling area lower roller way and a high-pressure cooling area upper pressing roller, and a gap between the high-pressure cooling area lower roller way and the high-pressure cooling area upper pressing roller is used for the plate and strip to pass through; the high-pressure cooling area is provided with at least 1 group of first nozzles, and the first nozzles are slit nozzles and comprise an upper slit nozzle and a lower slit nozzle; the high-pressure cooling area is provided with at least 1 group of second nozzles which are multi-row circular hole inclined jet flow nozzles and comprise a plurality of rows of circular hole inclined jet flow nozzles on the high-pressure cooling area and a plurality of rows of circular hole inclined jet flow nozzles under the high-pressure cooling area; the first nozzle and the second nozzle are used for cooling the plate and strip materials, the spraying direction of the first nozzle and the second nozzle is consistent with the moving direction of the plate and strip materials, and the first nozzle and the second nozzle are arranged with the lower roller way of the high-pressure cooling area and the upper press roller of the high-pressure cooling area at intervals.
Further, the low-pressure cooling area is provided with a low-pressure cooling area lower roller way and a low-pressure cooling area upper roller way, and a gap between the low-pressure cooling area lower roller way and the low-pressure cooling area upper roller way is used for the forward quenching plate strip and the reverse quenching plate strip to pass through; the low pressure cooling space sets up 1 at least group's third nozzle, and the third nozzle is multirow multi-angle cambered surface round hole jet nozzle, including last multirow multi-angle cambered surface round hole jet nozzle and multirow multi-angle cambered surface round hole jet nozzle down, and the third nozzle is used for cooling off the board strip, and with the low pressure cooling space down roll table and the roll table intermittent type in the low pressure cooling space arrange.
Further, the medium-pressure cooling area is provided with a medium-pressure cooling area lower roller way and a medium-pressure cooling area upper roller way, and a gap between the medium-pressure cooling area lower roller way and the medium-pressure cooling area upper roller way is used for the forward quenching plate strip and the reverse quenching plate strip to pass through; the intermediate pressure cooling zone is provided with at least 1 group of fourth nozzles, the fourth nozzles are multi-row round hole inclined jet flow nozzles, the multi-row round hole inclined jet flow nozzles on the intermediate pressure cooling zone and the multi-row round hole inclined jet flow nozzles under the intermediate pressure cooling zone are included, the fourth nozzles are used for cooling the plate strip, the spraying direction is consistent with the movement direction of the plate strip, and the spraying direction is arranged intermittently with the roller way on the intermediate pressure cooling zone and the roller way on the intermediate pressure cooling zone.
Further, before S2, a first nozzle, a second nozzle and a third nozzle are sequentially opened; the high-pressure cooling area lower roller way, the low-pressure cooling area lower roller way and the medium-pressure cooling area lower roller way rotate clockwise at the speed of 40m/min, and the high-pressure cooling area upper press roller, the low-pressure cooling area upper roller way and the medium-pressure cooling area upper roller way rotate anticlockwise at the speed of 40 m/min; the distances between the upper compression roller of the high-pressure cooling area and the upper roller of the low-pressure cooling area and the upper surface of the forward quenching plate strip are adjusted to be 2mm; the fourth nozzle is not opened, and the distance between the upper roller way of the medium-pressure cooling area and the upper surface of the forward quenching plate strip is adjusted to be more than or equal to 500mm.
Further, opening a fourth nozzle and a third nozzle in sequence before S4; the middle-pressure cooling area lower roller way and the low-pressure cooling area lower roller way both rotate anticlockwise at the speed of 4m/min, and the middle-pressure cooling area upper roller way and the low-pressure cooling area upper roller way both rotate clockwise at the speed of 4 m/min; the distances between the upper roller way of the medium-pressure cooling area and the upper roller way of the low-pressure cooling area and the upper surface of the reverse quenching plate strip are adjusted to 10mm; the first nozzle and the second nozzle are not opened, the distance between the upper compression roller of the high-pressure cooling area, the upper slit nozzle and the upper surface of the reverse quenching plate strip is adjusted to be more than or equal to 500mm, and the lower roller way of the high-pressure cooling area and the upper compression roller of the high-pressure cooling area do not rotate.
Further, in S4, the reverse quenching plate strip swings for a specified time in the low-pressure cooling area, after the swing is finished, the middle-pressure cooling area lower roller way and the low-pressure cooling area lower roller way are adjusted to rotate clockwise at the speed of 20m/min, and the middle-pressure cooling area upper roller way and the low-pressure cooling area upper roller way are adjusted to rotate anticlockwise at the speed of 20 m/min.
Further, the roller hearth type heat treatment furnace is arranged on one side, far away from the low-pressure cooling area, of the high-pressure cooling area, a roller way is arranged on one side, far away from the low-pressure cooling area, of the medium-pressure cooling area, and the external mechanized furnace is arranged on the side face of the roller way.
Further, the thickness range of the forward quenching plate strip is 4-40 mm.
Further, the thickness range of the reverse quenching plate strip is 40-300 mm.
(III) advantageous effects
The invention has the beneficial effects that:
the invention provides a process method for bidirectional heat treatment of metal plate strips, which is characterized in that the front part of a roller type quenching device is connected with a roller type heat treatment furnace through a roller way, the rear part of the roller type quenching device is connected with an external mechanized furnace through the roller way, and the plate strips with different thickness specifications are heated in the roller type heat treatment furnace and the external mechanized furnace respectively and then enter the roller type quenching device for cooling through the front part and the rear part of the roller type quenching device, and the process method has the following advantages:
1. the forward and reverse production is realized, and the device is matched with a front and back heat treatment heating furnace for use, so that the utilization rate of the roller type quenching machine is improved, and the production efficiency of the whole heat treatment line is improved;
2. aiming at different thickness specifications of the plate and strip, a special high-pressure cooling area for the thin plate and strip and a special medium-pressure cooling area for the medium-thickness plate and strip are respectively designed, so that the multi-purpose quenching device is realized, the specification range of the plate and strip suitable for the quenching device is expanded, the high-flatness heat treatment production of the ultrathin plate and strip and the high-uniformity heat treatment production of the medium-thickness plate and strip can be realized, and the heat treatment quality of the quenching device is improved.
The purposes of improving the utilization rate of the roller type quenching machine, improving the quality and the efficiency of a heat treatment line and meeting the requirements of the heat treatment cooling process of plate strips with different specifications are achieved.
Drawings
FIG. 1 is a process flow diagram of a forward heat treatment of a sheet metal strip;
FIG. 2 is a process flow diagram of the reverse heat treatment of a sheet metal strip;
FIG. 3 is a schematic view showing the positions of the respective devices in the heat treatment line in the forward heat treatment of the metal strip;
FIG. 4 is a schematic view showing the positions of the respective apparatuses in the heat treatment line in the reverse heat treatment of the metal sheet/strip.
[ description of reference ]
1: a roller hearth type heat treatment furnace; 2: an external mechanized furnace;
3: a quenching device; 31: a high pressure cooling zone; 311: a first nozzle; 312: a second nozzle; 313: a high-pressure cooling area lower roller way; 314: pressing rollers are arranged on the high-pressure cooling area; 32: a low pressure cooling zone; 321: a third nozzle; 322: a lower roller way in a low-pressure cooling area; 323: a roller way is arranged in a low-pressure cooling area; 33: a medium pressure cooling zone; 331: a middle-pressure cooling area lower roller way; 332: a middle-pressure cooling area is arranged on a roller way; 333: a fourth nozzle;
4: forward quenching the sheet and strip; 5: reversely quenching the plate and strip; 6: a roller way.
Detailed Description
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a process method for bidirectional heat treatment of metal plate strips, which is completed by heating equipment and cooling equipment, wherein the heating equipment comprises a roller hearth type heat treatment furnace 1 and an external mechanized furnace 2, and the cooling equipment is a quenching device 3; the quenching device 3 comprises a high-pressure cooling area 31 at the head, a low-pressure cooling area 32 at the middle and a medium-pressure cooling area 33 at the tail, the roller hearth type heat treatment furnace 1 is arranged on one side of the high-pressure cooling area 31 far away from the low-pressure cooling area 32, a roller bed 6 is arranged on one side of the medium-pressure cooling area 33 far away from the low-pressure cooling area 32, the external mechanized furnace 2 is arranged on the side surface of the roller bed 6, the roller bed 6 can convey the reverse quenching plate strip 5 coming out of the external mechanized furnace 2 from the medium-pressure cooling area 33 at the tail of the quenching device 3 into the quenching device 3, and convey the forward quenching plate strip 4 and the reverse quenching plate strip 5 out of the quenching device 3 from the medium-pressure cooling area 33 at the tail of the quenching device 3.
The forward quenching method is characterized in that a thick plate strip of 4-40 mm enters from the head of a high-pressure cooling area 31, and the high-pressure cooling area 31 and a low-pressure cooling area 32 are put into use to realize high-flatness heat treatment cooling of the plate strip and only realize one-time continuous forward passing cooling of the plate strip; the reverse quenching method is characterized in that a thick plate strip of 40-300 mm enters from the tail part of the medium-pressure cooling area 33 in a reverse direction, the medium-pressure cooling area 33 and the low-pressure cooling area 32 are put into use, high-uniformity heat treatment cooling of the plate strip is realized, and the plate strip is cooled by one-time continuous reverse passing or multiple reverse-forward swinging. It should be noted that the forward quenching has no oscillation, because the thickness of the plate and strip is small, and the quenching temperature drop can be completed without oscillation. In this example, the forward quenched sheet metal strip 4 was a sheet metal strip 6mm thick, 2500mm wide, and 8m long, and the reverse quenched sheet metal strip 5 was a sheet metal strip 150mm thick, 2500mm wide, and 8m long.
The high-pressure cooling area 31 is provided with a low-pressure cooling area roller way 313 and a high-pressure cooling area upper press roller 314, the low-pressure cooling area roller way 313 bears and transports the plate strip, the high-pressure cooling area upper press roller 314 applies downward pressure from the upper part of the plate strip to realize restrained quenching, a gap between the low-pressure cooling area roller way 313 and the high-pressure cooling area upper press roller 314 is used for the forward quenching of the plate strip 4 to pass through, in the embodiment, the high-pressure cooling area 31 is provided with 2 groups of first nozzles 311 and 3 groups of second nozzles 312 for cooling the plate strip, the spraying direction is consistent with the movement direction of the plate strip, and the spraying direction is arranged intermittently with the low-pressure cooling area roller way 313 and the high-pressure cooling area upper press roller 314. The control of water spray amount and restrained quenching control realize the high-flatness heat treatment cooling of the plate and the strip.
The low-pressure cooling area 32 is provided with a low-pressure cooling area lower roller way 322 and a low-pressure cooling area upper roller way 323, the low-pressure cooling area lower roller way 322 bears and transports the plate strip, the distance between the low-pressure cooling area upper roller way 323 and the upper surface of the plate strip is 2-10 mm, and a gap between the low-pressure cooling area lower roller way 322 and the low-pressure cooling area upper roller way 323 is used for the forward quenching plate strip 4 and the reverse quenching plate strip 5 to pass through; in the embodiment, 12 sets of third nozzles 321 are arranged in the low-pressure cooling zone 32, and the plate strip passing through the high-pressure cooling zone 31 or the medium-pressure cooling zone 33 is cooled continuously until the thickness of the plate strip is reduced to the quenching final cooling temperature. And is intermittently arranged with the lower roller table 322 of the low pressure cooling zone and the upper roller table 323 of the low pressure cooling zone.
The medium-pressure cooling area 33 is provided with a medium-pressure cooling area lower roller table 331 and a medium-pressure cooling area upper roller table 332, the medium-pressure cooling area lower roller table 331 bears and transports the plate strip, the distance between the medium-pressure cooling area upper roller table 332 and the upper surface of the plate strip is 2-10 mm, the distance between the medium-pressure cooling area upper roller table 332 and the upper surface of the plate strip is not less than 500mm during forward quenching, and a gap between the medium-pressure cooling area lower roller table 331 and the medium-pressure cooling area upper roller table 332 is used for the forward quenching plate strip 4 and the reverse quenching plate strip 5 to pass through; in this embodiment, the middle pressure cooling zone 33 is provided with 3 sets of fourth nozzles 333, the fourth nozzles 333 achieve high uniformity of heat treatment cooling of the sheet-strip, and the spraying direction coincides with the moving direction of the sheet-strip and is intermittently arranged with the middle pressure cooling zone lower roller table 331 and the middle pressure cooling zone upper roller table 332.
In the embodiment, the distance between the upper roll 314 of the high-pressure cooling area and the upper roll 323 of the low-pressure cooling area and the upper surface of the forward quenching plate strip 4 is adjusted to 2mm during forward quenching, and the distance between the upper roll 332 of the medium-pressure cooling area and the upper roll 323 of the low-pressure cooling area and the upper surface of the reverse quenching plate strip 5 is adjusted to 10mm during reverse quenching because the steel plate is thin and easily has quenching distortion during forward quenching, and the steel plate can be effectively restrained due to small roll gaps; the thickness of the steel plate is large during reverse quenching, the cooling water on the wall surface of the steel plate is more and is easy to accumulate, the heat exchange efficiency is influenced, and the roll gap is required to be larger so that the cooling water on the surface of the steel plate is redistributed.
Specifically, the first nozzle 311 is a slit nozzle including an upper slit nozzle and a lower slit nozzle; the slit nozzle is a continuous common slit, cooling water is sprayed out of the slit to form a water knife, the slit nozzle is large in water yield, strong in cooling capacity and uniform in cooling, rapid temperature drop of a near-surface area of a plate strip can be realized, and a large steel plate thickness direction temperature gradient is formed; for steel plates with the thickness of less than 12mm, the quenching process requirement can be met only by using a slit nozzle. The second nozzles 312 are multi-row circular hole inclined jet nozzles, and include multi-row circular hole inclined jet nozzles on the high-pressure cooling area and multi-row circular hole inclined jet nozzles under the high-pressure cooling area; the multiple rows of circular hole inclined jet nozzles are arranged behind the slit nozzles (in the process direction), and high-pressure water is adopted to continuously reduce the temperature of the near surface of the plate strip. The first nozzle 311 and the second nozzle 312 control the amount of water sprayed so that the water spraying pressure is 0.9 to 1.2MPa.
The fourth nozzles 333 are multiple rows of circular-hole-inclined jet nozzles, including multiple rows of circular-hole-inclined jet nozzles above the medium-pressure cooling zone and multiple rows of circular-hole-inclined jet nozzles below the medium-pressure cooling zone. Because this section is used for cooling thick specification steel sheet, the wall heat transfer ability is less important than section cooling capacity, adopts multirow round hole slope jet nozzle alone rather than adopting the gap nozzle because the gap nozzle water consumption is great, and because the steel sheet is thick, its instantaneous cooling capacity is big, the advantage of cooling evenly does not play, adopts multiunit multirow round hole slope jet nozzle also can reach thick steel sheet near surface temperature decline, thick to the effect that temperature gradient increases. The fourth nozzle 333 controls the amount of water sprayed so that the water spray pressure is 0.5 to 0.8MPa.
The lower nozzle is fixed on a lower roller bed frame which is fixed. The upper nozzle is fixed on the upper moving rack and can be adjusted up and down.
The process method for the bidirectional heat treatment of the metal plate strip specifically comprises the following steps:
s1, heating a forward quenching plate strip 4: heating a forward quenching plate strip 4 in a roller hearth heat treatment furnace 1;
in this embodiment, after S1 is finished, the following steps are also required: sequentially opening the first nozzle 311, the second nozzle 312 and the third nozzle 321; the high-pressure cooling area lower roller way 313, the low-pressure cooling area lower roller way 322 and the medium-pressure cooling area lower roller way 331 all rotate clockwise at the speed of 40m/min, and the high-pressure cooling area upper press roller 314, the low-pressure cooling area upper roller way 323 and the medium-pressure cooling area upper roller way 332 all rotate anticlockwise at the speed of 40 m/min; the distances between the upper press roll 314 in the high-pressure cooling area and the upper roller 323 in the low-pressure cooling area and the upper surface of the forward quenching plate strip 4 are adjusted to be 2mm; the fourth nozzle 333 is not opened, and the distance between the upper roller 332 in the medium-pressure cooling area, the plurality of rows of circular hole inclined jet nozzles below the medium-pressure cooling area and the upper surface of the forward quenching plate strip 4 is adjusted to be more than or equal to 500mm.
S2, cooling the forward quenching plate strip 4 and heating the reverse quenching plate strip 5: after the forward quenching plate strip 4 in the step S1 is heated to the process temperature, the forward quenching plate strip 4 enters a high-pressure cooling area 31 at the head of the quenching device 3 and is sequentially cooled by the high-pressure cooling area 31 and a low-pressure cooling area 32 in the middle, an upper pressure roller 314 of the high-pressure cooling area in the high-pressure cooling area 31 presses the upper surface of the forward quenching plate strip 4 downwards with a pressing force of 2-10 tons to realize constraint cooling, and meanwhile, the reverse quenching plate strip 5 is heated in the external mechanized furnace 2;
s3, conveying out the forward quenching plate strip 4: the forward quenching plate strip 4 cooled in the step S2 is conveyed out of a medium-pressure cooling area 33 at the tail part of the quenching device 3;
in this embodiment, after S3 ends, the following steps are also required: the fourth nozzle 333 and the third nozzle 321 are sequentially opened; the middle-pressure cooling zone lower roller table 331 and the low-pressure cooling zone lower roller table 322 both rotate counterclockwise at a speed of 4m/min, and the middle-pressure cooling zone upper roller table 332 and the low-pressure cooling zone upper roller table 323 both rotate clockwise at a speed of 4 m/min; the distances between the upper roller passage 332 in the medium-pressure cooling area and the upper roller passage 323 in the low-pressure cooling area and the upper surface of the reverse quenching plate strip 5 are adjusted to be 10mm; the first nozzle 311 and the second nozzle 312 are not opened, the distance between the upper press roll 314 of the high-pressure cooling area, the upper slit nozzles and the multiple rows of circular hole inclined jet flow nozzles on the high-pressure cooling area and the upper surface of the reverse quenching plate strip 5 is adjusted to be more than or equal to 500mm, and the lower roller 313 of the high-pressure cooling area and the upper press roll 314 of the high-pressure cooling area do not rotate.
S4, cooling the reverse quenching plate strip 5: after the reverse quenching plate strip 5 in the step S2 is heated to the process temperature, the reverse quenching plate strip 5 enters a medium-pressure cooling area 33 at the tail part of the quenching device 3 and is sequentially cooled by the medium-pressure cooling area 33 and a low-pressure cooling area 32 in the middle part;
in the embodiment, the reverse quenching sheet strip 5 swings in the low-pressure cooling area 32, the cooling time is prolonged, and the cooling effect is enhanced, the swinging time is 20min, after the swinging is finished, the middle-pressure cooling area lower roller 331 and the low-pressure cooling area lower roller 322 are both adjusted to rotate clockwise at the speed of 20m/min, and the middle-pressure cooling area upper roller 332 and the low-pressure cooling area upper roller 323 are both adjusted to rotate counterclockwise at the speed of 20 m/min.
S5, conveying out the reverse quenching plate strip 5: the reverse quenched sheet strip 5 cooled in S4 is carried out from the intermediate pressure cooling zone 33 at the tail of the quenching apparatus 3.
If it is desired to process the second forward quench plate strip 4, the second forward quench plate strip 4 is simultaneously heated in the roll-bottom heat treatment furnace 1 in S4 and steps S1-S3 are repeated after S5 is finished.
In addition, in order to save and prolong the life of the nozzles, the nozzles of one cooling zone are closed in sequence when the plate strip leaves the cooling zone.
In the description of the present specification, the description of "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (10)
1. A process method for the bidirectional heat treatment of a metal plate strip is characterized by comprising the following steps: s1, heating a forward quenching plate strip (4): heating the forward quenching plate strip (4) in a roller hearth heat treatment furnace (1);
s2, cooling the forward quenching plate strip (4) and heating the reverse quenching plate strip (5): after the forward quenching plate strip (4) in the S1 is heated to the process temperature, the forward quenching plate strip (4) enters a high-pressure cooling area (31) at the head of the quenching device (3), and is sequentially cooled by the high-pressure cooling area (31) and a low-pressure cooling area (32) in the middle, and meanwhile, the reverse quenching plate strip (5) is heated in an external mechanized furnace (2);
s3, conveying out the forward quenching plate strip (4): the forward quenching plate strip (4) cooled in the step S2 is conveyed out of a medium-pressure cooling area (33) at the tail part of the quenching device (3);
s4, cooling the reverse quenching plate strip (5): after the reverse quenching plate strip (5) in the S2 is heated to the process temperature, the reverse quenching plate strip (5) enters a medium-pressure cooling area (33) at the tail part of the quenching device (3) and is sequentially cooled by the medium-pressure cooling area (33) and a low-pressure cooling area (32) in the middle part;
s5, conveying out the reverse quenching plate strip (5): and (4) conveying the reverse quenching plate strip (5) cooled in the step (S4) out of a medium-pressure cooling area (33) at the tail part of the quenching device (3).
2. The process for the bi-directional heat treatment of sheet metal strips according to claim 1, characterised in that the high-pressure cooling zone (31) is provided with a high-pressure cooling zone lower roller table (313) and a high-pressure cooling zone upper press roller (314), the space between the high-pressure cooling zone lower roller table (313) and the high-pressure cooling zone upper press roller (314) being used for the passage of the sheet strips;
the high-pressure cooling area (31) is provided with at least 1 group of first nozzles (311), and the first nozzles (311) are slit nozzles and comprise an upper slit nozzle and a lower slit nozzle;
the high-pressure cooling area (31) is provided with at least 1 group of second nozzles (312), and the second nozzles (312) are multi-row circular hole inclined jet flow nozzles and comprise a plurality of rows of circular hole inclined jet flow nozzles on the high-pressure cooling area and a plurality of rows of circular hole inclined jet flow nozzles under the high-pressure cooling area;
the first nozzle (311) and the second nozzle (312) are used for cooling the plate strip, and the spraying direction is consistent with the moving direction of the plate strip and is arranged intermittently with the lower roller channel (313) of the high-pressure cooling area and the upper press roller (314) of the high-pressure cooling area.
3. The process for the bi-directional heat treatment of sheet metal strips according to claim 2, characterised in that the low-pressure cooling zone (32) is provided with a low-pressure cooling zone lower roller table (322) and a low-pressure cooling zone upper roller table (323), the interspace between the low-pressure cooling zone lower roller table (322) and the low-pressure cooling zone upper roller table (323) being used for the passage of the forward quenched sheet metal strip (4) and the reverse quenched sheet metal strip (5);
low pressure cooling space (32) set up 1 at least third nozzle (321), and third nozzle (321) are multirow multi-angle cambered surface round hole jet nozzle, including last multirow multi-angle cambered surface round hole jet nozzle and multirow multi-angle cambered surface round hole jet nozzle down, and third nozzle (321) are used for cooling off to the board strip, and with low pressure cooling space down roller table (322) and low pressure cooling space up roller table (323) intermittent type arrange.
4. A process for bi-directional heat treatment of sheet metal strips according to claim 3, characterised in that the medium pressure cooling zone (33) is provided with a medium pressure cooling zone lower roller table (331) and a medium pressure cooling zone upper roller table (332), the interspace between the medium pressure cooling zone lower roller table (331) and the medium pressure cooling zone upper roller table (332) being intended for the passage of forward quenched sheet metal strips (4) and reverse quenched sheet metal strips (5);
the medium-pressure cooling area (33) is provided with at least 1 group of fourth nozzles (333), the fourth nozzles (333) are multi-row circular hole inclined jet flow nozzles and comprise multi-row circular hole inclined jet flow nozzles on the medium-pressure cooling area and multi-row circular hole inclined jet flow nozzles under the medium-pressure cooling area, the fourth nozzles (333) are used for cooling the plate strip, the spraying direction is consistent with the moving direction of the plate strip, and the fourth nozzles are intermittently arranged with a roller way (331) under the medium-pressure cooling area and a roller way (332) on the medium-pressure cooling area.
5. Process for the bidirectional thermal treatment of sheet metal strip according to claim 4, characterized in that the first nozzle (311), the second nozzle (312), the third nozzle (321) are opened in sequence before S2; the high-pressure cooling area lower roller way (313), the low-pressure cooling area lower roller way (322) and the medium-pressure cooling area lower roller way (331) rotate clockwise at the speed of 40m/min, and the high-pressure cooling area upper press roller (314), the low-pressure cooling area upper roller way (323) and the medium-pressure cooling area upper roller way (332) rotate anticlockwise at the speed of 40 m/min; the distances between the upper compression roller (314) of the high-pressure cooling area and the upper roller bed (323) of the low-pressure cooling area and the upper surface of the forward quenching plate strip (4) are adjusted to be 2mm; the fourth nozzle (333) is not opened, and the distance between the upper roller way (332) of the medium-pressure cooling area, the plurality of rows of circular hole inclined jet nozzles below the medium-pressure cooling area and the upper surface of the forward quenching plate strip (4) is adjusted to be more than or equal to 500mm.
6. A process for bi-directional heat treatment of sheet metal strip according to claim 5 characterized in that the fourth nozzle (333) and the third nozzle (321) are opened in sequence before S4; the middle-pressure cooling area lower roller way (331) and the low-pressure cooling area lower roller way (322) rotate anticlockwise at the speed of 4m/min, and the middle-pressure cooling area upper roller way (332) and the low-pressure cooling area upper roller way (323) rotate clockwise at the speed of 4 m/min; the distances between the upper roller way (332) of the medium-pressure cooling area and the upper roller way (323) of the low-pressure cooling area and the upper surface of the reverse quenching plate strip (5) are adjusted to 10mm; the first nozzle (311) and the second nozzle (312) are not opened, the distance between the upper pressure roller (314) of the high-pressure cooling area, the upper slit nozzle and the upper surface of the reverse quenching plate strip (5) and the plurality of rows of circular hole inclined jet flow nozzles on the high-pressure cooling area is adjusted to be more than or equal to 500mm, and the lower roller table (313) of the high-pressure cooling area and the upper pressure roller (314) of the high-pressure cooling area do not rotate.
7. The process for the bi-directional heat treatment of sheet metal strip according to claim 6, characterized in that in S4 the counter-quenched sheet metal strip (5) is oscillated for a specified time in the low pressure cooling zone (32), after the oscillating is completed, the lower intermediate pressure cooling zone roller (331) and the lower low pressure cooling zone roller (322) are both adjusted to rotate clockwise at a speed of 20m/min, and the upper intermediate pressure cooling zone roller (332) and the upper low pressure cooling zone roller (323) are both adjusted to rotate counterclockwise at a speed of 20 m/min.
8. A process for the bi-directional heat treatment of sheet metal strips according to claim 7, characterised in that the furnace (1) is arranged on the side of the high-pressure cooling zone (31) remote from the low-pressure cooling zone (32), that the roller table (6) is arranged on the side of the medium-pressure cooling zone (33) remote from the low-pressure cooling zone (32), and that the external mechanized furnace (2) is arranged on the side of the roller table (6).
9. A process for bi-directional heat treatment of sheet metal strip according to claim 1, characterised in that the thickness of the forward quenched sheet strip (4) is in the range of 4-40 mm.
10. A process for the bidirectional heat treatment of sheet metal strips according to claim 1, characterized in that the thickness of the reverse quenched sheet strip (5) ranges from 40 to 300mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210524773.4A CN114959205B (en) | 2022-05-13 | 2022-05-13 | Process method for bidirectional heat treatment of metal plate strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210524773.4A CN114959205B (en) | 2022-05-13 | 2022-05-13 | Process method for bidirectional heat treatment of metal plate strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114959205A CN114959205A (en) | 2022-08-30 |
| CN114959205B true CN114959205B (en) | 2023-03-14 |
Family
ID=82983810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210524773.4A Active CN114959205B (en) | 2022-05-13 | 2022-05-13 | Process method for bidirectional heat treatment of metal plate strip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114959205B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011011245A (en) * | 2009-07-03 | 2011-01-20 | Nippon Steel Corp | Continuous thermo-mechanical treatment line of medium-high carbon steel wire rod |
| CN108486332A (en) * | 2018-05-04 | 2018-09-04 | 东北大学 | It is a kind of that the Strip roll-type quenching unit that reversely quenches and method can be achieved |
| CN110904315A (en) * | 2019-12-13 | 2020-03-24 | 慈溪市今日自动化科技有限公司 | Automatic quenching equipment |
| CN211199294U (en) * | 2019-12-13 | 2020-08-07 | 慈溪市今日自动化科技有限公司 | Automatic quenching equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207689B (en) * | 2018-10-19 | 2019-08-09 | 东北大学 | A kind of metal plates and strips roll-type quenching flow zone control device |
-
2022
- 2022-05-13 CN CN202210524773.4A patent/CN114959205B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011011245A (en) * | 2009-07-03 | 2011-01-20 | Nippon Steel Corp | Continuous thermo-mechanical treatment line of medium-high carbon steel wire rod |
| CN108486332A (en) * | 2018-05-04 | 2018-09-04 | 东北大学 | It is a kind of that the Strip roll-type quenching unit that reversely quenches and method can be achieved |
| CN110904315A (en) * | 2019-12-13 | 2020-03-24 | 慈溪市今日自动化科技有限公司 | Automatic quenching equipment |
| CN211199294U (en) * | 2019-12-13 | 2020-08-07 | 慈溪市今日自动化科技有限公司 | Automatic quenching equipment |
Non-Patent Citations (1)
| Title |
|---|
| 中厚板辊式淬火机淬火工艺自动控制***开发及应用;袁国等;《钢铁》;20101215(第12期);90-95 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114959205A (en) | 2022-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101890437B (en) | After-rolling cooling system for hot rolled steel strip production line | |
| CN102361704B (en) | Steel plate manufacturing equipment and method of manufacturing | |
| CN110760652A (en) | Sectional type heat treatment device and process method for metal plate strip | |
| CN103834792B (en) | A kind of steel plate continuous roll type quenching process | |
| CN202224453U (en) | Complete device of after-rolling ultrafast cooling system for hot-rolled strip steel production line | |
| CN205988958U (en) | A kind of wire and rod continuous casting billet is exempted from heating and is directly rolled system | |
| CN101935743B (en) | Medium plate on-line quenching inclined jet flow cooler | |
| CN101518788A (en) | Cooling device used for hot-rolled strip production line | |
| CN108486332A (en) | It is a kind of that the Strip roll-type quenching unit that reversely quenches and method can be achieved | |
| CN114959205B (en) | Process method for bidirectional heat treatment of metal plate strip | |
| CN107287397B (en) | A kind of hot continuous-milling steel plate cooling device for thermal treatment and control method | |
| CN115193911A (en) | Bar short-process production method based on deformation temperature cooperative control | |
| CN107661902A (en) | A kind of quick method for establishing cold-rolled process roller heat convex degree learning | |
| CN101792847A (en) | Direct thermal treatment process technology after rolling steel plate | |
| CN201394585Y (en) | Cooling equipment for hot-rolled strip steel production line | |
| CN103286147A (en) | Hot-rolled board strip production line laminar cooling method | |
| CN110695327A (en) | Jet rolling preparation method of aluminum alloy composite plate strip | |
| CN102382966B (en) | Accelerating cooling technology after medium plate tempering | |
| CN201793644U (en) | Oblique jet flow cooler for quenching medium plate on line | |
| CN111910060B (en) | Free-restraint quenching machine and free-restraint quenching process for thin and wide plates | |
| CN112387789A (en) | Method for improving cooling uniformity of TMCP steel plate | |
| CN212504986U (en) | Unconstrained quenching machine | |
| CN200952025Y (en) | High-strength low alloy steel unwarming blank acceleration cooling system | |
| CN202951740U (en) | Online roll bending and forming device for pipe fittings with ultra-high strength | |
| JPH0596320A (en) | Method for uniformly cooling thick steel plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |