CN112708742A - Continuous induction heat treatment process and treatment device for high-strength finish-rolled twisted steel - Google Patents
Continuous induction heat treatment process and treatment device for high-strength finish-rolled twisted steel Download PDFInfo
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- CN112708742A CN112708742A CN202011420426.4A CN202011420426A CN112708742A CN 112708742 A CN112708742 A CN 112708742A CN 202011420426 A CN202011420426 A CN 202011420426A CN 112708742 A CN112708742 A CN 112708742A
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- 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
- C21D1/667—Quenching devices for spray quenching
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- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
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- 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
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
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- 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
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
- C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods
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- 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
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/60—Continuous furnaces for strip or wire with induction heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to the technical field of steel bar production equipment, and particularly discloses a continuous induction heat treatment process and a continuous induction heat treatment device for high-strength finish-rolled threaded steel bars, which comprise the following steps: s1: the finish rolling threaded steel bars automatically go up to a U-shaped conveying rack (2) from a feeding system of the continuous heat treatment device, enter a first tempering heating device (3) under the action of a feeding clamping roller mechanism (6) at the left end, and are heated to 860 and 920 ℃ through a spiral high-frequency coil (301) in the first tempering heating device (3); s2: then, the finish-rolled twisted steel heated to 860-plus 920 ℃ enters a spray box (401) through a corresponding through hole (402), a water suction pump (404) is started to pump external cooling liquid into an inverted U-shaped spray pipe (402), then the cooling liquid is sprayed out from a plurality of atomizing nozzles (405), and the finish-rolled twisted steel is quenched and cooled to 420-plus 450 ℃; s3: and then, sending the finish-rolled twisted steel after quenching and cooling into a second tempering and heating device (5), heating the finish-rolled twisted steel to 600-.
Description
Technical Field
The invention relates to the technical field of steel bar production equipment, and particularly discloses a continuous induction heat treatment process and a continuous induction heat treatment device for high-strength finish-rolled threaded steel bars.
Background
The high-strength finish-rolled threaded steel bar is a steel bar with external threads in a special shape rolled on the whole steel bar by a hot rolling method, and then the steel bar is subjected to heat treatment to improve the mechanical property. At present, the heat treatment process of the high-strength finish rolling twisted steel is mainly to heat the twisted steel by a heater, then to quench and cool the twisted steel to about 400 ℃ by a cooling device, and finally to temper and heat to about 600 ℃ for a period of time and then to slowly cool the twisted steel to the normal temperature.
At present, the device for carrying out continuous induction heat treatment on the high-strength finish-rolled twisted steel can only carry out heat treatment on one steel bar at a time, the heat treatment efficiency is low, and the production capacity of the whole high-strength finish-rolled twisted steel is greatly limited. In addition, the heating means in the existing heat treatment apparatus is only a high frequency induction coil, and the reinforcing steel bar easily comes into contact with the coil when passing therethrough, thereby scratching the high frequency induction coil. In addition, the existing cooling quenching device is generally arranged above the threaded steel coil, the upper surface of the steel coil can be rapidly cooled when the steel coil is cooled by water spraying, and the cooling speed of the lower surface of the steel coil is slow, so that the temperature difference between the upper surface and the lower surface of the whole steel coil is large, and the steel coil is easy to bend.
For example, the utility model with the patent number CN202849504U discloses an online heat treatment device for steel bars, which comprises a frame and a high-frequency heating coil fixed on the frame, wherein the heating section of the high-frequency heating coil is a solenoid formed by a hollow tube bent in a spiral shape; although the reinforcing steel bar on-line heat treatment device heats the reinforcing steel bar through the high-frequency heating coil, the on-line tempering treatment of the cold-rolled reinforcing steel bar can be realized, the cold-rolling stress of the reinforcing steel bar can be eliminated, the structure of the cold-rolled reinforcing steel bar is more uniform, and the comprehensive mechanical property of the reinforcing steel bar can be improved; but the steel bars can only be heated once, the heat treatment process is not good, and simultaneously, only one steel bar can be treated each time, so the heat treatment efficiency is low. Therefore, in order to overcome the above disadvantages of the conventional online heat treatment device for steel bars, it is an object of the present invention to provide a heat treatment device capable of simultaneously performing primary tempering, uniform quenching and cooling, secondary tempering, and slow cooling to room temperature.
Disclosure of Invention
To the above-mentioned not enough of current reinforcing bar on-line heat treatment device, design one kind and can carry out once tempering, even quenching cooling, secondary tempering and slowly cool off to the heat treatment device of normal atmospheric temperature to a plurality of reinforcing bars simultaneously.
The invention is realized by the following technical scheme:
a high-strength finish rolling twisted steel continuous induction heat treatment device comprises an L-shaped frame plate, a U-shaped conveying rack, a first tempering heating device, a spray cooling quenching device and a second tempering heating device; the lower surface of the U-shaped conveying rack is provided with a plurality of support legs at intervals, the lower ends of the support legs are fixedly connected with the upper surface of the bottom plate of the L-shaped rack plate, and the first tempering heating device, the spray cooling quenching device and the second tempering heating device are sequentially arranged in the U-shaped conveying rack from left to right;
the feeding clamping roller mechanisms are arranged at the leftmost end and the rightmost end of the U-shaped conveying rack and comprise a first upper clamping roller and a first lower clamping roller, a plurality of annular clamping grooves are formed in the roller bodies of the first upper clamping roller and the first lower clamping roller at intervals, the first upper clamping roller and the first lower clamping roller are arranged in a vertically symmetrical mode, first convex plates are arranged on the U-shaped conveying rack at the front end and the rear end of the first upper clamping roller and the first lower clamping roller respectively, a rear end face roller shaft of the first upper clamping roller and a rear end face roller shaft of the first lower clamping roller are rotatably connected with bearings on the first convex plate at the rear side, a first gear transmission box is arranged on the front side face of the first convex plate at the front side, two first gears which are arranged in a vertically symmetrical mode and are meshed with each other are arranged in the first gear transmission box, and the front end face roller shafts of the two first upper clamping rollers and the first lower clamping roller extend into the first gear transmission box to be connected with the inner end faces of the corresponding first gears, the outer surface of the first gear transmission box is provided with a first driving motor, and an output shaft of the first driving motor extends into the first gear transmission box to be connected with the outer end of one of the first gears;
a first guide roller is arranged on the U-shaped conveying rack positioned between the feeding clamping roller mechanism and the first tempering heating device, a second guide roller and a third guide roller are distributed and rotatably arranged on the U-shaped conveying rack positioned on the left side and the right side of the spray cooling quenching device, and a plurality of annular clamping grooves are also formed in the roller bodies of the first guide roller, the second guide roller and the third guide roller;
the first tempering heating device and the second tempering heating device respectively comprise a spiral line high-frequency coil, an inner ceramic body and an outer ceramic body, wherein the outer surface of the inner ceramic body is provided with an outer surface spiral ring groove matched with the spiral line high-frequency coil, the outer ceramic body is divided into an upper ceramic body and a lower ceramic body, the two outer ceramic bodies are symmetrically arranged up and down, two end parts of the outer ceramic body are connected with convex edges extending outwards, the convex edges are respectively provided with a plurality of connecting holes, connecting fastening bolts are arranged in the connecting holes, inner surface spiral ring grooves are formed in the inner surfaces of the two outer ceramic bodies, and the spiral line high-frequency coil is arranged between the outer surface spiral ring groove and the inner surface;
the spray cooling quenching device comprises a spray box fixed at the middle section of a U-shaped conveying frame, a plurality of perforation holes are formed in the left side face and the right side face of the spray box, each perforation hole corresponds to each annular clamping groove, an inverted U-shaped spray pipe is arranged in the spray box, the upper end middle section of each inverted U-shaped spray pipe is connected with a high-pressure water pipe extending out of the U-shaped conveying frame, the lower end of each high-pressure water pipe is connected with a water suction pump, a plurality of atomizing nozzles are arranged on the inner side face of each U-shaped spray pipe, and horizontal bar-shaped overflow ports are formed in the front side face and the rear side face of the spray box below.
As the further setting of above-mentioned scheme, the right flank upper end of spraying case is provided with servo motor, the end connection that servo motor's output shaft stretched into the spraying case has the lead screw, the roof left end of spraying case is connected with and rotates the seat, the tip of lead screw is connected with and rotates the seat, the upper end of the type of falling U spraying pipe is connected with screw nut, the lateral surface is connected with the direction slider around the type of falling U spraying pipe, the slide opening has been seted up on the direction slider, all be provided with the direction slide bar with slide opening matched with on the preceding back wall of spraying case, the upper end interlude of the type of falling U spraying pipe is connected with flexible pipe, the tip of flexible pipe is connected with high-pressure water pipe.
As a further arrangement of the above scheme, six atomizing nozzles are arranged at the upper end of the U-shaped spraying pipe, one atomizing nozzle is arranged at two sides of the U-shaped spraying pipe, and six atomizing nozzles are arranged at the lower end of the U-shaped spraying pipe.
As a further arrangement of the above scheme, the telescopic pipe is a corrugated telescopic pipe.
As a further arrangement of the scheme, 4-6 uniform annular clamping grooves are formed in the first upper clamping roller, the first lower clamping roller, the first guide roller, the second guide roller and the third guide roller.
As a further arrangement of the above scheme, the L-shaped frame plate is connected with two connecting strips, and the two connecting strips are respectively fixedly connected with the upper surfaces of the first tempering heating device and the second tempering heating device.
As a further arrangement of the scheme, a control panel is arranged on the vertical side face of the L-shaped frame plate.
A process for carrying out heat treatment by using the high-strength finish rolling twisted steel continuous induction heat treatment device is characterized by comprising the following steps of:
s1: the finish rolling threaded steel bars automatically go up to a U-shaped conveying rack from a feeding system of the continuous heat treatment device, enter a first tempering heating device under the action of a feeding clamping roller mechanism at the left end, and are heated to 860 and 920 ℃ through a spiral high-frequency coil in the first tempering heating device;
s2: then, the finish-rolled twisted steel heated to 860-plus 920 ℃ enters a spray box through corresponding through holes, a water suction pump is started to pump external cooling liquid into an inverted U-shaped spray pipe, then the outside cooling liquid is sprayed out from a plurality of atomizing nozzles, and the finish-rolled twisted steel is quenched and cooled to 420-plus 450 ℃;
s3: then, sending the finish-rolled twisted steel after quenching and cooling into a second tempering and heating device, heating the finish-rolled twisted steel to 600-660 ℃, and then preserving heat for 3-5 min;
s4: and finally, sending the finish-rolled twisted steel subjected to secondary tempering heating out of the U-shaped conveying rack through a feeding pinch roller mechanism at the right end, and then air-cooling to normal temperature.
Preferably, the percentage of chemical components of the finish-rolled threaded steel bar is C: 0.40-0.60%, Si: 0.60-2.0%, Mn: 0.60-2.0%, Mo: 0.10-0.40%, V: 0.10-0.30 percent of Cr, 0.30-1.20 percent of Cr0.01-0.10 percent of Ti0.0002-0.0005 percent of B and P, S being less than or equal to 0.03 percent.
Preferably, the first tempering is heated to 900 ℃, the quenching is cooled to 445 ℃, and the second tempering is heated to 630 DEG C
Compared with the prior art, the invention has the following beneficial effects:
1) the invention discloses a high-strength finish rolling twisted steel continuous induction heat treatment device, which can sequentially send a plurality of steel bars into a first tempering heating device, a spray cooling quenching device and a second tempering heating device for first heating tempering, then spray quenching and cooling, then second heating tempering, and finally slowly cooling to normal temperature through a clamping roller and a guide roller at one time.
2) The first tempering heating device and the second tempering heating device of the high-strength finish rolling threaded steel bar continuous induction heat treatment device clamp the spiral line high-frequency coil inside through the outer ceramic body and the inner ceramic body, the outer ceramic body and the inner ceramic body can prevent the spiral line high-frequency coil from being scratched in the conveying process of the steel bar, and the inner ceramic body and the outer ceramic body can play an insulating role, so that the using effect of the whole tempering heating device is greatly improved.
3) The inverted U-shaped spray pipe can simultaneously cool the upper and lower surfaces of a plurality of steel bars in the spray cooling process, so that the problem caused by uneven cooling of the upper and lower surfaces of the steel bars in the quenching process of the existing spray cooling device can be avoided; in addition, the screw rod is driven by the servo motor to rotate positively and negatively to drive the inverted U-shaped spraying pipe to move left and right in the spraying box, so that the steel coil can be subjected to all-dimensional spraying cooling, and the cooling effect is more excellent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic perspective view of a first angle according to the present invention;
FIG. 2 is a schematic perspective view of a U-shaped conveying frame, a tempering heating device, a spray cooling quenching device and the like in the invention;
FIG. 3 is a schematic plane structure diagram of a U-shaped conveying rack, a tempering heating device, a spray cooling quenching device and the like in the invention;
FIG. 4 is a schematic perspective view of a first upper material clamping roller, a first lower material clamping roller or a material guiding roller according to the present invention;
FIG. 5 is a schematic perspective view of a gear box, a first driving motor, etc. according to the present invention;
FIG. 6 is a schematic view of the internal plan structure of the gear box of the present invention;
FIG. 7 is a schematic perspective view of the helical high-frequency coil of the present invention;
FIG. 8 is a schematic perspective view of the inner ceramic body according to the present invention;
FIG. 9 is a perspective assembly view of two outer ceramic bodies according to the present invention;
fig. 10 is a schematic perspective view of an inverted U-shaped spray tube, an atomizing nozzle, and the like according to the present invention.
Wherein: 1-L-shaped frame plate, 2-U-shaped conveying frame, 201-support foot, 202-first convex plate, 203-bearing, 204-first gear transmission case, 205-first gear, 206-first driving motor, 3-first tempering heating device, 301-spiral high-frequency coil, 302-inner ceramic body, 303-outer ceramic body, 304-outer surface spiral ring groove, 305-convex edge, 306-connecting hole, 307-connecting fastening bolt, 308-inner surface spiral ring groove, 4-spray cooling quenching device, 401-spray box, 402-inverted U-shaped spray pipe, 403-high pressure water pipe, 404-water pump, 405-atomizing nozzle, 406-horizontal overflow strip-shaped port, 407-servo motor, 408-lead screw, 409-rotating seat, 410-a screw nut, 411-a guide sliding block, 412-a sliding hole, 413-a guide sliding rod, 414-a telescopic pipe, 5-a second tempering heating device, 6-a feeding clamping roller mechanism, 601-a first upper clamping roller, 602-a first lower clamping roller, 603-an annular clamping groove, 7-a first guide roller, 8-a second guide roller, 9-a third guide roller, 10-a connecting strip and 11-a control panel.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
It should be noted that the terms "first" and "second" in the description of the present invention are used merely for convenience in describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The following describes a continuous induction heat treatment apparatus for high-strength finish-rolled twisted steel bars according to the present invention with reference to fig. 1 to 10.
Example 1
This embodiment 1 discloses a high-strength finish rolling twisted steel continuous induction heat treatment device, refer to fig. 1, and its major structure includes L-shaped frame plate 1, U-shaped conveyor frame 2, first tempering heating device 3, spray cooling quenching device 4 and second tempering heating device 5. A plurality of support legs 201 are arranged on the lower surface of the U-shaped conveyor frame 2 at intervals, the lower ends of the support legs 201 are fixedly connected with the upper surface of the bottom plate of the L-shaped frame plate 1, and a control panel 11 is arranged on the vertical side surface of the L-shaped frame plate 1.
Referring to fig. 2 and fig. 3, a first tempering and heating device 3, a spray cooling and quenching device 4 and a second tempering and heating device 5 are sequentially arranged in a U-shaped conveying frame 2 from left to right. Wherein, be connected with two connecting strips 10 on L type rack board 1, two connecting strips 10 are connected with the upper surface fixed connection of first tempering heating device 3, second tempering heating device 5 respectively. And feeding pinch roller mechanisms 6 are arranged at the leftmost end and the rightmost end of the U-shaped conveying frame 2. Specifically, referring to fig. 4, fig. 5 and fig. 6, the feeding nip roller mechanism 6 includes a first upper nip roller 601 and a first lower nip roller 602, and a plurality of annular nip grooves 603 are formed on the roller bodies of the first upper nip roller 601 and the first lower nip roller 602 at intervals. The first upper material clamping roller 601 and the first lower material clamping roller 602 are arranged in an up-down symmetrical manner, the U-shaped conveying frames 2 positioned at the front ends and the rear ends of the first upper material clamping roller 601 and the first lower material clamping roller 602 are respectively provided with a first convex plate 202, rear end face roll shafts of the first upper material clamping roller 601 and the first lower material clamping roller 602 are rotatably connected with a bearing 203 on the first convex plate 202 at the rear side, the front side surface of the first convex plate 202 at the front side is provided with a first gear transmission box 204, two first gears 205 which are symmetrical up and down and are meshed are arranged inside the first gear transmission box 204, the front end face roll shafts of the two first upper material clamping rollers 601 and the first lower material clamping roller 602 extend into the first gear transmission box 204 to be connected with the inner end face of the corresponding first gear 205, the outer surface of the first gear transmission box 204 is provided with a first driving motor 206, and an output shaft of the first driving motor 206 extends into the first gear transmission box 204 to be connected with one of the outer ends of the first gears 205; the first upper material clamping roller 601 and the first lower material clamping roller 602 can rotate oppositely through the driving action of the first driving motor 206, so that left and right feeding is realized.
Referring to fig. 3, a first guide roller 7 is arranged on the U-shaped conveyor frame 2 between the feeding pinch roller mechanism 6 and the first tempering and heating device 3, a second guide roller 8 and a third guide roller 9 are distributed and rotatably arranged on the U-shaped conveyor frame 2 at the left and right sides of the spray cooling and quenching device 4, and a plurality of annular clamping grooves are also arranged on the roller bodies of the first guide roller 7, the second guide roller 8 and the third guide roller 9, and each annular groove corresponds to the annular clamping groove on each first upper clamping roller 601 and each first lower clamping roller 602. Specifically, 4-6 uniform annular clamping grooves are formed in the first upper clamping roller 601, the first lower clamping roller 602, the first guide roller 7, the second guide roller 8 and the third guide roller 9.
Referring to fig. 7, 8 and 9, the first tempering heating device 3 and the second tempering heating device 5 each include a spiral line high-frequency coil 301, an inner ceramic body 302 and an outer ceramic body 303, an outer surface spiral ring groove 304 matched with the spiral line high-frequency coil 301 is formed in the outer surface of the inner ceramic body 302, the outer ceramic body 303 is divided into two upper and lower parts, the two outer ceramic bodies 303 are arranged symmetrically up and down, outward extending convex edges 305 are connected to two end portions of the outer ceramic body 303, a plurality of connecting holes 306 are formed in the convex edges 305, connecting fastening bolts 307 are arranged in the connecting holes 306, inner surface spiral ring grooves 308 are formed in the inner surfaces of the two outer ceramic bodies 303, and the spiral line high-frequency coil 301 is arranged between the outer surface spiral ring groove 304 and the inner; the spiral line high-frequency coil 301 is clamped between the inner ceramic body 302 and the outer ceramic body 303, so that the spiral line high-frequency coil 301 can be prevented from being damaged in the reinforcing steel bar re-feeding process.
Referring to fig. 3 and 10, the spray cooling quenching device 4 includes a spray box 401 fixed at the middle section of the U-shaped conveyor frame 2, a plurality of through holes 402 are provided on the left and right side surfaces of the spray box 401, each through hole 402 corresponds to the annular clamping groove, an inverted U-shaped spray pipe 402 is provided in the spray box 401, the middle section of the upper end of the inverted U-shaped spray pipe 402 is connected with a high-pressure water pipe 403 extending out of the U-shaped conveyor frame 2, the lower end of the high-pressure water pipe 403 is connected with a water suction pump 404, and the inner side surface of the U-shaped spray pipe 402 is provided with a plurality of atomizing nozzles 405. Specifically, six atomizing nozzles 405 are provided at the upper end of the U-shaped spray pipe 402, one atomizing nozzle 405 is provided at both sides thereof, and six atomizing nozzles 405 are provided at the lower end thereof. Finally, horizontal strip-shaped overflow ports 406 are formed in the front side surface and the rear side surface of the spray box 401 below the inverted U-shaped spray pipe 402.
Example 2
Embodiment 2 discloses a high-strength finish-rolled twisted steel continuous induction heat treatment device improved based on embodiment 1, and referring to fig. 1, the main structure of the device comprises an L-shaped frame plate 1, a U-shaped conveyor frame 2, a first tempering heating device 3, a spray cooling quenching device 4 and a second tempering heating device 5. A plurality of support legs 201 are arranged on the lower surface of the U-shaped conveyor frame 2 at intervals, the lower ends of the support legs 201 are fixedly connected with the upper surface of the bottom plate of the L-shaped frame plate 1, and a control panel 11 is arranged on the vertical side surface of the L-shaped frame plate 1.
Referring to fig. 2 and fig. 3, a first tempering and heating device 3, a spray cooling and quenching device 4 and a second tempering and heating device 5 are sequentially arranged in a U-shaped conveying frame 2 from left to right. Wherein, be connected with two connecting strips 10 on L type rack board 1, two connecting strips 10 are connected with the upper surface fixed connection of first tempering heating device 3, second tempering heating device 5 respectively. And feeding pinch roller mechanisms 6 are arranged at the leftmost end and the rightmost end of the U-shaped conveying frame 2. Specifically, referring to fig. 4, fig. 5 and fig. 6, the feeding nip roller mechanism 6 includes a first upper nip roller 601 and a first lower nip roller 602, and a plurality of annular nip grooves 603 are formed on the roller bodies of the first upper nip roller 601 and the first lower nip roller 602 at intervals. The first upper material clamping roller 601 and the first lower material clamping roller 602 are arranged in an up-down symmetrical manner, the U-shaped conveying frames 2 positioned at the front ends and the rear ends of the first upper material clamping roller 601 and the first lower material clamping roller 602 are respectively provided with a first convex plate 202, rear end face roll shafts of the first upper material clamping roller 601 and the first lower material clamping roller 602 are rotatably connected with a bearing 203 on the first convex plate 202 at the rear side, the front side surface of the first convex plate 202 at the front side is provided with a first gear transmission box 204, two first gears 205 which are symmetrical up and down and are meshed are arranged inside the first gear transmission box 204, the front end face roll shafts of the two first upper material clamping rollers 601 and the first lower material clamping roller 602 extend into the first gear transmission box 204 to be connected with the inner end face of the corresponding first gear 205, the outer surface of the first gear transmission box 204 is provided with a first driving motor 206, and an output shaft of the first driving motor 206 extends into the first gear transmission box 204 to be connected with one of the outer ends of the first gears 205; the first upper material clamping roller 601 and the first lower material clamping roller 602 can rotate oppositely through the driving action of the first driving motor 206, so that left and right feeding is realized.
Referring to fig. 3, a first guide roller 7 is arranged on the U-shaped conveyor frame 2 between the feeding pinch roller mechanism 6 and the first tempering and heating device 3, a second guide roller 8 and a third guide roller 9 are distributed and rotatably arranged on the U-shaped conveyor frame 2 at the left and right sides of the spray cooling and quenching device 4, and a plurality of annular clamping grooves are also arranged on the roller bodies of the first guide roller 7, the second guide roller 8 and the third guide roller 9, and each annular groove corresponds to the annular clamping groove on each first upper clamping roller 601 and each first lower clamping roller 602. Specifically, 4-6 uniform annular clamping grooves are formed in the first upper clamping roller 601, the first lower clamping roller 602, the first guide roller 7, the second guide roller 8 and the third guide roller 9.
Referring to fig. 7, 8 and 9, the first tempering heating device 3 and the second tempering heating device 5 each include a spiral line high-frequency coil 301, an inner ceramic body 302 and an outer ceramic body 303, an outer surface spiral ring groove 304 matched with the spiral line high-frequency coil 301 is formed in the outer surface of the inner ceramic body 302, the outer ceramic body 303 is divided into two upper and lower parts, the two outer ceramic bodies 303 are arranged symmetrically up and down, outward extending convex edges 305 are connected to two end portions of the outer ceramic body 303, a plurality of connecting holes 306 are formed in the convex edges 305, connecting fastening bolts 307 are arranged in the connecting holes 306, inner surface spiral ring grooves 308 are formed in the inner surfaces of the two outer ceramic bodies 303, and the spiral line high-frequency coil 301 is arranged between the outer surface spiral ring groove 304 and the inner; the spiral line high-frequency coil 301 is clamped between the inner ceramic body 302 and the outer ceramic body 303, so that the spiral line high-frequency coil 301 can be prevented from being damaged in the reinforcing steel bar re-feeding process.
Referring to fig. 3 and 10, the spray cooling quenching device 4 includes a spray box 401 fixed at the middle section of the U-shaped conveyor frame 2, a plurality of through holes 402 are provided on the left and right side surfaces of the spray box 401, each through hole 402 corresponds to the annular clamping groove, an inverted U-shaped spray pipe 402 is provided in the spray box 401, the middle section of the upper end of the inverted U-shaped spray pipe 402 is connected with a high-pressure water pipe 403 extending out of the U-shaped conveyor frame 2, the lower end of the high-pressure water pipe 403 is connected with a water suction pump 404, and the inner side surface of the U-shaped spray pipe 402 is provided with a plurality of atomizing nozzles 405. Specifically, six atomizing nozzles 405 are provided at the upper end of the U-shaped spray pipe 402, one atomizing nozzle 405 is provided at both sides thereof, and six atomizing nozzles 405 are provided at the lower end thereof. Finally, horizontal strip-shaped overflow ports 406 are formed in the front side surface and the rear side surface of the spray box 401 below the inverted U-shaped spray pipe 402.
Referring to fig. 3, a servo motor 407 is disposed at the upper end of the right side surface of the spray box 401 in this embodiment 2, a lead screw 408 is connected to an end portion of an output shaft of the servo motor 407 extending into the spray box 401, a rotating seat 409 is connected to the left end of the top wall of the spray box 401, an end portion of the lead screw 408 is connected to the rotating seat 409, a lead screw nut 410 is connected to the upper end of the inverted U-shaped spray pipe 402, a guide slider 411 is connected to the front and rear outer side surfaces of the inverted U-shaped spray pipe 402, a sliding hole 412 is formed in the guide slider 411, guide sliding rods 413 matched with the sliding hole 412 are disposed on the front and rear walls of the spray box 401, an extension pipe 414 is connected to the middle section of the upper end of the inverted U-shaped spray pipe 402, specifically, the. In this embodiment 2, the inverted U-shaped spray pipe 402 can be moved left and right in the spray box 401 by the rotation of the screw 408, so that the steel bars after the first tempering and heating are quenched and cooled uniformly in all directions.
The process for heat treatment using the continuous induction heat treatment apparatus for high-strength finish-rolled threaded steel bars disclosed in example 1 or example 2, comprising the steps of:
s1: the finish rolling threaded steel bars automatically go up to a U-shaped conveying rack from a feeding system of the continuous heat treatment device, enter a first tempering heating device under the action of a feeding clamping roller mechanism at the left end, and are heated to 860 and 920 ℃ through a spiral high-frequency coil in the first tempering heating device;
s2: then, the finish-rolled twisted steel heated to 860-plus 920 ℃ enters a spray box through corresponding through holes, a water suction pump is started to pump external cooling liquid into an inverted U-shaped spray pipe, then the outside cooling liquid is sprayed out from a plurality of atomizing nozzles, and the finish-rolled twisted steel is quenched and cooled to 420-plus 450 ℃;
s3: then, sending the finish-rolled twisted steel after quenching and cooling into a second tempering and heating device, heating the finish-rolled twisted steel to 600-660 ℃, and then preserving heat for 3-5 min;
s4: and finally, sending the finish-rolled twisted steel subjected to secondary tempering heating out of the U-shaped conveying rack through a feeding pinch roller mechanism at the right end, and then air-cooling to normal temperature.
The chemical component percentage of the finish-rolled twisted steel in the application is C: 0.40-0.60%, Si: 0.60-2.0%, Mn: 0.60-2.0%, Mo: 0.10-0.40%, V: 0.10-0.30 percent of Cr, 0.30-1.20 percent of Cr0.01-0.10 percent of Ti0.0002-0.0005 percent of B and P, S being less than or equal to 0.03 percent.
Specifically, when parameters are set, the first tempering heating in the treatment process is carried out to 900 ℃, the quenching cooling is carried out to 445 ℃, and the second tempering heating is carried out to 630 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A continuous induction heat treatment process for high-strength finish-rolled twisted steel bars is characterized by comprising the following steps:
s1: the finish rolling threaded steel bars automatically go up to a U-shaped conveying rack (2) from a feeding system of the continuous heat treatment device, enter a first tempering heating device (3) under the action of a feeding clamping roller mechanism (6) at the left end, and are heated to 860 and 920 ℃ through a spiral high-frequency coil (301) in the first tempering heating device (3);
s2: then, the finish-rolled twisted steel heated to 860-plus 920 ℃ enters a spray box (401) through a corresponding through hole (402), a water suction pump (404) is started to pump external cooling liquid into an inverted U-shaped spray pipe (402), then the cooling liquid is sprayed out from a plurality of atomizing nozzles (405), and the finish-rolled twisted steel is quenched and cooled to 420-plus 450 ℃;
s3: then, sending the finish-rolled twisted steel after quenching and cooling into a second tempering and heating device (5), heating the finish-rolled twisted steel to 600-;
s4: and finally, sending the finish-rolled twisted steel subjected to secondary tempering heating out of the U-shaped conveying rack (2) through a feeding pinch roller mechanism (6) at the right end, and then air-cooling to normal temperature.
2. The continuous induction heat treatment process for high-strength finish-rolled threaded steel bars according to claim 1, characterized in that the chemical composition percentage of the finish-rolled threaded steel bars is C: 0.40-0.60%, Si: 0.60-2.0%, Mn: 0.60-2.0%, Mo: 0.10-0.40%, V: 0.10-0.30 percent of Cr, 0.30-1.20 percent of Cr0.01-0.10 percent of Ti0.0002-0.0005 percent of B and P, S being less than or equal to 0.03 percent.
3. The continuous induction heat treatment process of a high-strength finish-rolled threaded steel bar according to claim 1, wherein the first tempering heating is performed to 900 ℃, the quenching cooling is performed to 445 ℃, and the second tempering heating is performed to 630 ℃.
4. A high-strength finish rolling twisted steel continuous induction heat treatment device is characterized by comprising an L-shaped frame plate (1), a U-shaped conveying rack (2), a first tempering heating device (3), a spray cooling quenching device (4) and a second tempering heating device (5); a plurality of support legs (201) are arranged on the lower surface of the U-shaped conveying rack (2) at intervals, the lower ends of the support legs (201) are fixedly connected with the upper surface of a bottom plate of the L-shaped rack plate (1), and the first tempering heating device (3), the spray cooling quenching device (4) and the second tempering heating device (5) are sequentially arranged in the U-shaped conveying rack (2) from left to right;
the feeding clamping roller mechanisms (6) are arranged at the leftmost end and the rightmost end of the U-shaped conveying rack (2), each feeding clamping roller mechanism (6) comprises a first upper clamping roller (601) and a first lower clamping roller (602), a plurality of annular clamping grooves (603) are formed in the roller bodies of the first upper clamping roller (601) and the first lower clamping roller (602) at intervals, the first upper clamping roller (601) and the first lower clamping roller (602) are arranged in an up-and-down symmetrical mode, first convex plates (202) are arranged on the U-shaped conveying rack (2) at the front end and the rear end of the first upper clamping roller (601) and the first lower clamping roller (602), rear end face roller shafts of the first upper clamping roller (601) and the first lower clamping roller (602) are rotatably connected with bearings (203) on the first convex plates (202) at the rear side, and a first gear transmission box (204) is arranged on the front side face of the first convex plates (202) at the front side, two first gears (205) which are symmetrical up and down and are arranged in a meshed mode are arranged inside the first gear transmission box (204), front end face roll shafts of the two first upper material clamping rollers (601) and the first lower material clamping rollers (602) extend into the first gear transmission box (204) to be connected with the inner end face of the corresponding first gear (205), a first driving motor (206) is arranged on the outer surface of the first gear transmission box (204), and an output shaft of the first driving motor (206) extends into the first gear transmission box (204) to be connected with the outer end of one first gear (205);
a first guide roller (7) is arranged on the U-shaped conveying rack (2) between the feeding clamping roller mechanism (6) and the first tempering heating device (3), a second guide roller (8) and a third guide roller (9) are distributed and rotatably arranged on the U-shaped conveying rack (2) on the left side and the right side of the spray cooling quenching device (4), and a plurality of annular clamping grooves are also formed in the roller bodies of the first guide roller (7), the second guide roller (8) and the third guide roller (9);
wherein the first tempering heating device (3) and the second tempering heating device (5) both comprise a spiral line high-frequency coil (301), an inner ceramic body (302) and an outer ceramic body (303), the outer surface of the inner ceramic body (302) is provided with an outer surface spiral ring groove (304) matched with the spiral line high-frequency coil (301), the outer ceramic body (303) is divided into an upper part and a lower part, the two outer ceramic bodies (303) are arranged in a vertically symmetrical manner, convex edges (305) extending outwards are connected to two end parts of the outer ceramic bodies (303), a plurality of connecting holes (306) are arranged on the convex edge (305), connecting fastening bolts (307) are arranged in the connecting holes (306), and the inner surfaces of the two outer ceramic bodies (303) are provided with inner surface spiral ring grooves (308), the spiral line high-frequency coil (301) is arranged between the outer surface spiral ring groove (304) and the inner surface spiral ring groove (308);
the spray cooling quenching device (4) comprises a spray box (401) fixed at the middle section of a U-shaped conveying rack (2), a plurality of through holes (402) are formed in the left side surface and the right side surface of the spray box (401), each through hole (402) corresponds to an annular clamping groove, an inverted U-shaped spray pipe (402) is arranged in the spray box (401), the middle section of the upper end of the inverted U-shaped spray pipe (402) is connected with a high-pressure water pipe (403) extending out of the U-shaped conveying rack (2), the lower end of the high-pressure water pipe (403) is connected with a water suction pump (404), a plurality of atomizing nozzles (405) are arranged on the inner side surface of the U-shaped spray pipe (402), and horizontal strip-shaped overflow ports (406) are formed in the front side surface and the rear side surface of the spray box (401) below the; a servo motor (407) is arranged at the upper end of the right side surface of the spray box (401), a screw rod (408) is connected to the end part of an output shaft of the servo motor (407) extending into the spray box (401), the left end of the top wall of the spray box (401) is connected with a rotating seat (409), the end part of the lead screw (408) is connected with the rotating seat (409), the upper end of the inverted U-shaped spray pipe (402) is connected with a screw nut (410), the front and back outer side surfaces of the inverted U-shaped spray pipe (402) are connected with a guide sliding block (411), a slide hole (412) is arranged on the guide slide block (411), guide slide rods (413) matched with the slide hole (412) are arranged on the front wall and the rear wall of the spray box (401), the middle section of the upper end of the inverted U-shaped spraying pipe (402) is connected with an extension pipe (414), and the end part of the extension pipe (414) is connected with a high-pressure water pipe (403).
5. The continuous induction heat treatment apparatus for high-strength finish-rolled threaded reinforcing steel according to claim 2, wherein: six atomizing nozzles (405) are arranged at the upper end of the U-shaped spraying pipe (402), one atomizing nozzle (405) is arranged at the two sides of the U-shaped spraying pipe, and six atomizing nozzles (405) are arranged at the lower end of the U-shaped spraying pipe.
6. The continuous induction heat treatment apparatus of a high-strength finish-rolled threaded reinforcing bar according to claim 2 or 3, wherein: the telescopic pipe (414) is a corrugated telescopic pipe.
7. The continuous induction heat treatment apparatus for high-strength finish-rolled threaded reinforcing steel according to claim 4, wherein: the number of the uniform annular clamping grooves formed in the first upper clamping roller (601), the first lower clamping roller (602), the first guide roller (7), the second guide roller (8) and the third guide roller (9) is 4-6.
8. The continuous induction heat treatment apparatus for high-strength finish-rolled threaded reinforcing steel according to claim 4, wherein: the L-shaped frame plate (1) is connected with two connecting strips (10), and the two connecting strips (10) are fixedly connected with the upper surfaces of the first tempering heating device (3) and the second tempering heating device (5) respectively.
9. The continuous induction heat treatment apparatus for high-strength finish-rolled threaded reinforcing steel according to claim 4, wherein: and a control panel (11) is arranged on the vertical side surface of the L-shaped frame plate (1).
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| CN116571666A (en) * | 2023-04-02 | 2023-08-11 | 江苏省镔鑫钢铁集团有限公司 | Production equipment and process for micro-titanium treated high-strength anti-seismic deformed steel bar |
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