CN113528766A - Isothermal normalizing process for 20Cr2Ni4 steel - Google Patents
Isothermal normalizing process for 20Cr2Ni4 steel Download PDFInfo
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- CN113528766A CN113528766A CN202110891937.2A CN202110891937A CN113528766A CN 113528766 A CN113528766 A CN 113528766A CN 202110891937 A CN202110891937 A CN 202110891937A CN 113528766 A CN113528766 A CN 113528766A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 239000010959 steel Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 78
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 238000004321 preservation Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000005192 partition Methods 0.000 claims description 4
- 238000000137 annealing Methods 0.000 abstract description 3
- 238000005496 tempering Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 2
- 230000007723 transport mechanism Effects 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
-
- 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
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0025—Supports; Baskets; Containers; Covers
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention discloses an isothermal normalizing process for 20Cr2N i4 steel, which relates to the technical field of heat treatment processes and comprises the following steps: placing the steel blank to the upper side of the mesh belt through a feeding frame; step two: moving the steel blank to a heating box of an isothermal normalizing furnace, and heating and carrying out primary heat preservation; step three: automatically transferring the steel blank to a quick cooling box to carry out a quick cooling process; step four: cooling the steel blank to the working temperature in the isothermal box, moving the steel blank into the isothermal box, and performing a secondary heat preservation step to obtain a finished product of steel; step five: and moving the finished steel product into a discharging box, discharging and cooling to room temperature. The invention mainly adopts the isothermal normalizing process with simple process, low cost and short production period, so that the hardness of the 20Cr2N i4 steel can reach 179-217HB after one-time normalizing. Solves the problem that high-temperature tempering or annealing is needed after normalizing in the prior art.
Description
Technical Field
The invention relates to the technical field of heat treatment processes, in particular to an isothermal normalizing process for 20Cr2Ni4 steel.
Background
The heat treatment refers to a metal hot working process for obtaining expected structures and properties by heating, heat preservation and cooling the materials in a solid state, wherein the normalizing treatment is one of the common modes in the heat treatment process, the normalizing treatment is a heat treatment process for heating steel or steel parts to a proper temperature above a critical point AC3 or ACM for a certain time and then cooling the steel or steel parts in air to obtain pearlite structures, the 20Cr2Ni4 steel has high austenite stability, and is heated to the normalizing temperature, and the steel is taken out of a furnace and empty to reach a quenching state, so that the structures generate martensite, and the normalized hardness is far higher than the hardness of the steel which is easy to cut.
In the well-type furnace annealing process in the prior art, steel is put into a furnace at the temperature of 850-.
Disclosure of Invention
The invention aims to provide an isothermal normalizing process for 20Cr2Ni4 steel, which solves the following technical problems:
(1) in the existing heat treatment process, the production period is longer, the efficiency is lower, and simultaneously, the hardness fluctuation range of the steel is larger after the steel is treated;
(2) the efficiency of the existing normalizing furnace in feeding and discharging is slow, and the work intensity and power loss are large when a steel blank is moved.
The purpose of the invention can be realized by the following technical scheme:
an isothermal normalizing process of 20Cr2Ni4 steel, comprising the following steps:
the method comprises the following steps: placing the steel blank to the upper side of the mesh belt through a feeding frame;
step two: moving the steel blank to a heating box of an isothermal normalizing furnace, and heating and carrying out primary heat preservation;
step three: automatically transferring the steel blank to a quick cooling box to carry out a quick cooling process;
step four: cooling the steel blank to the working temperature in the isothermal box, moving the steel blank into the isothermal box, and performing a secondary heat preservation step to obtain a finished product of steel;
step five: and moving the finished steel product into a discharging box, discharging and cooling to room temperature.
As a further scheme of the invention: the steel blank is 20Cr2Ni4 series steel.
As a further scheme of the invention: a first heating area, a second heating area and a third heating area are arranged in the heating box.
As a further scheme of the invention: the working temperature of the first heating area is 920-.
As a further scheme of the invention: the working temperature of the second heating area is 930-950 ℃.
As a further scheme of the invention: the working temperature of the heating three zones is 930-950 ℃.
As a further scheme of the invention: in the second step, the time duration of the heating and primary heat preservation step is 150-170 min.
As a further scheme of the invention: the cooling procedure time in the third step is 5-8 min.
As a further scheme of the invention: an isothermal first zone, an isothermal second zone and an isothermal third zone are arranged in the isothermal box.
As a further scheme of the invention: the working temperature of the isothermal first zone is 670-.
As a further scheme of the invention: the working temperature of the isothermal second zone is 670-.
As a further scheme of the invention: the working temperature of the isothermal zone is 670-690 ℃.
As a further scheme of the invention: the time duration of the heat preservation step in the fourth step is 145-165 min.
As a further scheme of the invention: the production cycle time of the normalizing process is 5.1-5.7 h.
As a further scheme of the invention: the normalizing furnace comprises a heating box, wherein a quick cooling box and an isothermal box are sequentially arranged on one side of the heating box, a feeding box and a discharging box are respectively arranged on one sides of the heating box and the isothermal box, which are far away from the quick cooling box, a feeding frame is arranged on one side of the feeding box, which is far away from the heating box, a conveying mechanism is arranged inside the feeding box, the heating box, the quick cooling box, the isothermal box and the discharging box, and a mesh belt is arranged on the upper side of the conveying mechanism;
the internally mounted of fast cooler bin has the heating frame, and installs the biography incubator between fast cooler bin and the heating cabinet, a pot head of biography incubator is established in the outside of heating frame for give the heating frame with the heat transfer of heating cabinet inside.
As a further scheme of the invention: the one end of ejection of compact case is installed out the flitch, and the one end of going out the flitch inclines down.
As a further scheme of the invention: the feeding box comprises a box body, wherein a plurality of first hydraulic rods are fixedly connected to the two sides of the interior of the box body, which are close to the conveying mechanism, and an assembly frame is fixedly connected to the output ends of the first hydraulic rods.
As a further scheme of the invention: the equal fixedly connected with support frame of downside of feeding case, heating cabinet, fast cold box, isothermal box and ejection of compact case, the support frame is used for adjusting the whole height of feeding case, heating cabinet, fast cold box, isothermal box and ejection of compact case.
As a further scheme of the invention: the feeding frame comprises a base plate and an assembling plate, a plurality of second hydraulic rods are fixedly connected between the base plate and the assembling plate, the upper surface of the assembling plate is rotatably connected with a rotating plate, the lower surface of the assembling plate is fixedly connected with a driving motor, and the output end of the driving motor is fixedly connected with the rotating plate.
As a further scheme of the invention: and a telescopic frame is arranged between the base plate and the assembling plate and close to the outer sides of the plurality of second hydraulic rods and is used for supporting the base plate and the assembling plate.
As a further scheme of the invention: the one end fixedly connected with support column of rotor plate upper surface, and one side fixedly connected with third hydraulic stem that the rotor plate upper surface is close to the support column, the top of support column is rotated and is connected with the conveyer, it is connected with the trace to rotate between the lower surface of conveyer and the output of third hydraulic stem.
As a further scheme of the invention: the one end fixedly connected with riser that the support frame is close to last work or material rest, one side fixedly connected with fourth hydraulic stem of riser towards last work or material rest, the outside fixedly connected with of fourth hydraulic stem supports the cover with the support frame is connected, and the output of fourth hydraulic stem is connected with the base plate of last work or material rest.
As a further scheme of the invention: the fast cold box's the outside fixedly connected with two sets of high pressure positive blower, the inside fixedly connected with of fast cold box goes out the first tuber pipe of wind and the second tuber pipe of wind, first tuber pipe and second play wind pipe distribute respectively in the upper and lower both sides of heating frame, and the air intake that first tuber pipe and second play wind pipe are connected with two sets of high pressure positive blower's air outlet respectively.
As a further scheme of the invention: the heat transfer box comprises a heat conduction sleeve, an assembly box and a heat insulation box, the heat conduction sleeve is installed in the heating box, the assembly box is fixedly connected to the outer side of the isothermal box, the heat insulation box is fixedly connected to the inner portion of the isothermal box, a fifth hydraulic rod is fixedly connected to the inner portion of the assembly box, a connecting piece is fixedly connected to the output end of the fifth hydraulic rod, and one end of the connecting piece penetrates through the isothermal box and extends to the inner portion of the heat insulation box.
As a further scheme of the invention: the one end of heating frame extends to the inside of heat-insulating box, the inside of heat-insulating box is provided with the sleeve pipe that the cover was established in the heating frame outside, sheathed tube one side and connecting piece fixed connection, the communicating groove of accomodating the sheathed tube is seted up at the position of connection of fast cooler bin and isothermal box, the both ends in communicating groove respectively with fast cooler bin and isothermal box intercommunication, sheathed tube one end extends to the inside in communicating groove.
As a further scheme of the invention: the heat conduction sleeve is provided with an embedded groove, and the sleeve and the heat conduction sleeve are at the same horizontal height.
As a further scheme of the invention: the working method of the feeding frame in the first step comprises the following steps:
s1: starting a third hydraulic rod, and rotating one end of the conveyor along the support column to incline towards the ground;
s2: moving the steel blank to the upper side of the conveyor, and placing the steel blank in a placing area assembled by a plurality of partition plates at one time;
s3: starting a third hydraulic rod, rotating the conveyor to a horizontal state, starting the second hydraulic rod, lifting the conveyor to one side of the feeding box, starting the third hydraulic rod again, and turning one end of the conveyor to one side of the feeding box;
s4: starting the conveyor, moving the steel blank to the upper sides of the two groups of conveyor belts, and starting the two groups of conveyor belts to drive the steel blank on the upper sides to move;
s5: and starting the first hydraulic rod to drive the two groups of conveying belts to descend, and placing the steel blanks on the upper sides of the two groups of conveying belts to the upper side of the mesh belt.
The invention has the beneficial effects that:
according to the isothermal normalizing process, the process is simple, the cost is low, and the production period is short, so that the hardness of 20Cr2Ni4 steel reaches 179-217HB after one-time normalizing, the problem that high-temperature tempering or annealing is required after normalizing in the prior art is solved, and the normalized hardness is detected to be 190-200HB by using a 210HBS-3000 digital display Brinell hardness tester;
meanwhile, the metallographic structure of the steel is observed by a metallographic microscope, and the structure consists of tempered sorbite and part of ferrite, so that the method is simple to operate, low in cost, short in production period, uniform in structure and hardness, and small in hardness fluctuation range, the homogenization of the structure can be completed after the 20Cr2Ni4 steel is processed, and the transformation of the structure can be completed after the 20Cr2Ni4 steel is rapidly cooled;
on the other hand, the two ends of the isothermal normalizing furnace are respectively provided with the feeding box and the discharging box, so that the steel blank can be moved to a mesh belt of the isothermal normalizing furnace, the working efficiency of the normalizing furnace is improved, and the working strength for carrying the steel blank is reduced;
and through last work or material rest, can shift a batch of steel blank to the inlet box with lower consumption to the automation and the mechanical degree of going up the work or material rest are high, can reduce staff's intensity of labour, and through the equipment frame, can place the steel blank on the guipure in proper order.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a side view of an isothermal normalizing furnace according to the present invention;
FIG. 3 is a block diagram of the loading frame and the feed box of the present invention;
FIG. 4 is a partial structural view of the instant freezer of the present invention;
FIG. 5 is a schematic view of the construction of the heat transfer case of the present invention;
FIG. 6 is a metallographic structure of a 20Cr2Ni4 material 100X normalized metallographic structure in a metallographic structure of the invention;
FIG. 7 is a metallographic structure showing a 500X normalized metallographic structure of 20Cr2Ni4 material according to the invention.
In the figure: 1. a heating box; 2. a quick cooling box; 3. an isothermal box; 4. a feeding box; 5. a discharging box; 6. a feeding frame; 7. a discharge plate; 8. a heating rack; 9. a heat transfer box; 10. a transport mechanism; 11. a mesh belt; 12. a high pressure fan; 13. a support frame; 41. a box body; 42. a first hydraulic lever; 43. an assembly frame; 44. a conveyor belt; 61. a substrate; 62. assembling a plate; 63. a telescopic frame; 64. a second hydraulic rod; 65. a conveyor; 66. a support pillar; 67. a third hydraulic lever; 68. a linkage rod; 69. a partition plate; 610. a drive motor; 611. a vertical plate; 612. a fourth hydraulic lever; 613. a support sleeve; 614. a rotating plate; 21. a first air outlet pipe; 22. a second air outlet pipe; 91. assembling a box; 92. a heat insulation box; 93. a fifth hydraulic lever; 94. a connecting member; 95. a sleeve; 96. a heat conducting sleeve.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1-7, the present invention relates to an isothermal normalizing process of 20Cr2Ni4 steel, comprising the following steps:
the method comprises the following steps: placing the steel blank to the upper side of the mesh belt 11 through the feeding frame 6;
step two: moving the steel blank into a heating box 1 of an isothermal normalizing furnace, and carrying out heating and primary heat preservation steps, wherein a first heating area, a second heating area and a third heating area are arranged in the heating box 1, the working temperature of the first heating area is 930 ℃, the working temperature of the second heating area is 940 ℃, the working temperature of the third heating area is 945 ℃, and the duration of the heating and primary heat preservation steps is 160 min;
step three: automatically transferring the steel blank into a quick cooling box 2, and cooling for 6 min;
step four: cooling the steel blank to the working temperature in the isothermal box 3, moving the steel blank into the isothermal box 3, and carrying out a heat preservation step for 150min to obtain a finished steel product, wherein a first isothermal zone, a second isothermal zone and a third isothermal zone are arranged in the isothermal box 3, the working temperature of the first isothermal zone is 680 ℃, the working temperature of the second isothermal zone is 675 ℃, and the working temperature of the third isothermal zone is 672 ℃;
step five: and moving the finished steel product into a discharging box 5, discharging and cooling to room temperature.
The production cycle of the normalizing process is 5.27 h.
The normalizing furnace comprises a heating box 1, wherein a quick cooling box 2 and an isothermal box 3 are sequentially arranged on one side of the heating box 1, a feeding box 4 and a discharging box 5 are respectively arranged on one sides of the heating box 1 and the isothermal box 3, which are far away from the quick cooling box 2, a feeding frame 6 is arranged on one side of the feeding box 4, which is far away from the heating box 1, a conveying mechanism 10 is arranged inside the feeding box 4, the heating box 1, the quick cooling box 2, the isothermal box 3 and the discharging box 5, and a mesh belt 11 is arranged on the upper side of the conveying mechanism 10;
the internally mounted of fast cooler bin 2 has heating frame 8, and installs between fast cooler bin 2 and the heating cabinet 1 and pass the incubator 9, and a pot head of pass the incubator 9 is established in the outside of heating frame 8 for give heating frame 8 with the heat transfer of heating cabinet 1 inside.
One end of the discharging box 5 is provided with a discharging plate 7, and one end of the discharging plate 7 inclines downwards and is used for taking out the product from the isothermal normalizing furnace.
The feeding box 4 comprises a box body 41, a plurality of first hydraulic rods 42 are fixedly connected to the two sides of the interior of the box body 41 close to the conveying mechanism 10, and an assembly frame 43 is fixedly connected to the output ends of the two groups of the plurality of first hydraulic rods 42.
The equal fixedly connected with support frame 13 of downside of feeding case 4, heating cabinet 1, fast cold box 2, isothermal box 3 and ejection of compact case 5, support frame 13 is used for adjusting the whole height of feeding case 4, heating cabinet 1, fast cold box 2, isothermal box 3 and ejection of compact case 5 to transport mechanism 10 is conveniently installed.
Go up the work or material rest 6 and include base plate 61 and equipment board 62, fixedly connected with a plurality of second hydraulic stem 64 between base plate 61 and the equipment board 62, and the upper surface of equipment board 62 rotates and is connected with rotor plate 614, and the lower fixed surface of equipment board 62 is connected with driving motor 610, and driving motor 610's output and rotor plate 614 fixed connection.
An expansion bracket 63 is mounted between the base plate 61 and the assembly plate 62 and near the outer sides of the plurality of second hydraulic rods 64, and is used for supporting the base plate 61 and the assembly plate 62.
One end fixedly connected with support column 66 of rotating plate 614 upper surface, and rotating plate 614 upper surface is close to one side fixedly connected with third hydraulic stem 67 of support column 66, and the top of support column 66 rotates and is connected with conveyer 65, rotates between the lower surface of conveyer 65 and the output of third hydraulic stem 67 to be connected with trace 68.
One end of the support frame 13 close to the feeding frame 6 is fixedly connected with a vertical plate 611, one side of the vertical plate 611 facing the feeding frame 6 is fixedly connected with a fourth hydraulic rod 612, the outer side of the fourth hydraulic rod 612 is fixedly connected with a support sleeve 613 connected with the support frame 13, and the output end of the fourth hydraulic rod 612 is connected with the substrate 61 of the feeding frame 6.
The outside fixedly connected with two sets of high pressure positive blower 12 of fast cold box 2, the inside fixedly connected with of fast cold box 2 goes out tuber pipe 21 and second and goes out tuber pipe 22, and first tuber pipe 21 and second play tuber pipe 22 distribute respectively in the upper and lower both sides of heating frame 8, and the air intake of first tuber pipe 21 and second play tuber pipe 22 is connected with the air outlet of two sets of high pressure positive blower 12 respectively.
The heat transfer box 9 comprises a heat conduction sleeve 96, an assembly box 91 and a heat insulation box 92, wherein the heat conduction sleeve 96 is installed in the heating box 1, the assembly box 91 is fixedly connected to the outer side of the isothermal box 3, the heat insulation box 92 is fixedly connected to the inner side of the isothermal box 3, a fifth hydraulic rod 93 is fixedly connected to the inner side of the assembly box 91, a connecting piece 94 is fixedly connected to the output end of the fifth hydraulic rod 93, and one end of the connecting piece 94 penetrates through the isothermal box 3 and extends to the inner side of the heat insulation box 92.
One end of the heating frame 8 extends to the inside of the heat insulation box 92, a sleeve 95 sleeved outside the heating frame 8 is arranged inside the heat insulation box 92, one side of the sleeve 95 is fixedly connected with the connecting piece 94, a connecting part of the quick cooling box 2 and the isothermal box 3 is provided with a communicating groove for accommodating the sleeve 95, two ends of the communicating groove are respectively communicated with the quick cooling box 2 and the isothermal box 3, and one end of the sleeve 95 extends to the inside of the communicating groove.
The heat-conducting sleeve 96 is provided with an embedded groove, and the sleeve 95 and the heat-conducting sleeve 96 are at the same horizontal height.
The working principle of the invention is as follows:
the third hydraulic rod 67 is started, the conveyor 65 is driven to rotate through the linkage rod 68, and one end of the conveyor 65 rotates along the support column 66 to incline towards the ground;
the steel blanks are sequentially moved to the upper side of the conveyor 65 and are placed inside a placing area assembled by a plurality of partition plates 69 at a time;
the third hydraulic rod 67 is started, the conveyor 65 is rotated to be in a horizontal state, the second hydraulic rod 64 is started, the assembly plate 62 is lifted, when the assembly plate 62 is lifted, the telescopic frame 63 is driven to be unfolded, the conveyor 65 is lifted to one side of the feeding box 4, the third hydraulic rod 67 is started again, the conveyor 65 is driven to rotate through the linkage rod 68, and one end of the conveyor 65 is turned to one side of the feeding box 4;
starting the first hydraulic rod 42, lifting the two groups of assembly frames 43 to the upper side of the mesh belt 11, starting the conveyor 65, moving the steel blank to the upper sides of the two groups of conveying belts 44, and after moving one group of steel blank to the upper sides of the conveying belts 44, starting the two groups of conveying belts 44 to drive the steel blank on the upper sides to move to a station, wherein the width of the single station is the same as the width of the processed steel blank;
starting the first hydraulic rod 42 to drive the two groups of conveyer belts 44 to descend, and placing the steel blanks on the upper sides of the two groups of conveyer belts 44 to the upper side of the mesh belt 11;
start a set of high pressure positive blower 12 that links to each other with first tuber pipe 21, cool off the steel blank, and simultaneously, start fifth hydraulic stem 93 in the heat transfer case 9, fifth hydraulic stem 93 drives sleeve pipe 95 through connecting piece 94 and removes, run through the inside that the intercommunication groove removed to embedded groove in heat-conducting sleeve 96 with sleeve pipe 95's one end, accomplish sleeve pipe 95 and heat-conducting sleeve 96's equipment, heat-conducting sleeve 96 heats the back in heating cabinet 1, the temperature rises, accomplish the equipment back at sleeve pipe 95, through sleeve pipe 95, with heat transfer to in the heating frame 8, start the fan that goes out tuber pipe 22 intercommunication with the second, after heating through heating frame 8 with the air, cool off steel.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. An isothermal normalizing process of 20Cr2Ni4 steel, which is characterized by comprising the following steps:
the method comprises the following steps: placing the steel blank to the upper side of the mesh belt (11) through a feeding frame (6);
step two: moving the steel blank into a heating box (1) of an isothermal normalizing furnace, and heating and carrying out primary heat preservation;
step three: automatically transferring the steel blank into a quick cooling box (2) to carry out a quick cooling process;
step four: cooling the steel blank to the working temperature in the isothermal box (3), moving the steel blank into the isothermal box (3), and performing a secondary heat preservation step to obtain a finished product of steel;
step five: and moving the finished steel product into a discharging box (5), discharging and cooling to room temperature.
2. Isothermal normalizing process of 20Cr2Ni4 steel products according to claim 1, characterized in that the heating box (1) is internally provided with a first heating zone, a second heating zone and a third heating zone.
3. The isothermal normalizing process of 20Cr2Ni4 steel according to claim 2, wherein the operating temperature of the first heating zone is 920-940 ℃, the operating temperature of the second heating zone is 930-950 ℃, and the operating temperature of the third heating zone is 930-950 ℃.
4. The isothermal normalizing process of 20Cr2Ni4 steel according to claim 3, wherein in the second step, the duration of the heating and primary heat preservation steps is 150-170 min.
5. Isothermal normalizing process of 20Cr2Ni4 steel products according to claim 1, characterized in that the cooling step in the third step is carried out for a period of 5-8 min.
6. Isothermal normalizing process of 20Cr2Ni4 steel products according to claim 1, characterized in that the isothermal box (3) is internally provided with a first isothermal zone, a second isothermal zone and a third isothermal zone.
7. The isothermal normalizing process for 20Cr2Ni4 steel according to claim 6, wherein the operating temperature of the isothermal first zone is 670-690 ℃, the operating temperature of the isothermal second zone is 670-690 ℃, and the operating temperature of the isothermal third zone is 670-690 ℃.
8. The isothermal normalizing process of 20Cr2Ni4 steel according to claim 1, wherein the duration of the step IV is 145-165 min.
9. Isothermal normalizing process of 20Cr2Ni4 steel according to claim 1, characterized in that the normalizing process has a production cycle time duration of 5.1-5.7 h.
10. Isothermal normalizing process of 20Cr2Ni4 steel according to claim 1, characterized in that the working method of the loading frame (6) in step one comprises the following steps:
s1: starting a third hydraulic rod (67) to rotate one end of the conveyor (65) along the supporting column (66) to incline towards the ground;
s2: moving the steel blank to the upper side of a conveyor (65) and placing the steel blank in a placing area assembled by a plurality of partition plates (69) at a time;
s3: starting a third hydraulic rod (67), rotating the conveyor (65) to a horizontal state, starting a second hydraulic rod (64), lifting the conveyor (65) to one side of the feeding box (4), starting the third hydraulic rod (67) again, and turning one end of the conveyor (65) to one side of the feeding box (4);
s4: starting the conveyor (65), moving the steel blank to the upper sides of the two groups of conveyor belts (44), and starting the two groups of conveyor belts (44) to drive the steel blank on the upper sides to move;
s5: and starting the first hydraulic rod (42) to drive the two groups of conveying belts (44) to descend, and placing the steel blanks on the upper sides of the two groups of conveying belts (44) to the upper side of the mesh belt (11).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114480793A (en) * | 2021-12-23 | 2022-05-13 | 江苏理研科技股份有限公司 | Multifunctional heat treatment furnace and control method thereof |
| CN117210649A (en) * | 2023-09-21 | 2023-12-12 | 中科卓异环境科技(东莞)有限公司 | Steel normalizing equipment and steel normalizing method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005068509A (en) * | 2003-08-26 | 2005-03-17 | Toyota Motor Corp | Method for simulating forging and normalizing |
| CN1847413A (en) * | 2005-04-12 | 2006-10-18 | 万向钱潮股份有限公司 | Normalizing heat treatment process of 20Cr2Ni4 steel |
| CN101363073A (en) * | 2008-09-10 | 2009-02-11 | 江苏太平洋精密锻造有限公司 | Isothermal normalizing process for carburized gear steel forging stock |
| CN104278134A (en) * | 2013-07-12 | 2015-01-14 | 无锡成博科技发展有限公司 | Normalizing thermal treatment process of 20Cr2Ni4 |
| CN105671254A (en) * | 2014-11-21 | 2016-06-15 | 天津仁和鼎盛钢瓶制造有限公司 | Automatic conveying rack used for tilting type normalizing furnace |
| CN106086330A (en) * | 2016-06-30 | 2016-11-09 | 安庆市振发汽车锻件有限责任公司 | 16MnCrS5 isothermal normalizing technique |
| CN210936525U (en) * | 2019-09-09 | 2020-07-07 | 天津市彬荣钢管有限公司 | Steel strip feeding rack for galvanized pipe production |
| CN210945696U (en) * | 2019-12-16 | 2020-07-07 | 郑州高氏电磁感应加热设备有限公司 | Horizontal continuous quenching machine tool |
| CN212077107U (en) * | 2020-03-31 | 2020-12-04 | 苏州工业园区伍格工业炉有限公司 | Automatic feeding frame for mesh belt type normalizing furnace |
-
2021
- 2021-08-04 CN CN202110891937.2A patent/CN113528766A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005068509A (en) * | 2003-08-26 | 2005-03-17 | Toyota Motor Corp | Method for simulating forging and normalizing |
| CN1847413A (en) * | 2005-04-12 | 2006-10-18 | 万向钱潮股份有限公司 | Normalizing heat treatment process of 20Cr2Ni4 steel |
| CN101363073A (en) * | 2008-09-10 | 2009-02-11 | 江苏太平洋精密锻造有限公司 | Isothermal normalizing process for carburized gear steel forging stock |
| CN104278134A (en) * | 2013-07-12 | 2015-01-14 | 无锡成博科技发展有限公司 | Normalizing thermal treatment process of 20Cr2Ni4 |
| CN105671254A (en) * | 2014-11-21 | 2016-06-15 | 天津仁和鼎盛钢瓶制造有限公司 | Automatic conveying rack used for tilting type normalizing furnace |
| CN106086330A (en) * | 2016-06-30 | 2016-11-09 | 安庆市振发汽车锻件有限责任公司 | 16MnCrS5 isothermal normalizing technique |
| CN210936525U (en) * | 2019-09-09 | 2020-07-07 | 天津市彬荣钢管有限公司 | Steel strip feeding rack for galvanized pipe production |
| CN210945696U (en) * | 2019-12-16 | 2020-07-07 | 郑州高氏电磁感应加热设备有限公司 | Horizontal continuous quenching machine tool |
| CN212077107U (en) * | 2020-03-31 | 2020-12-04 | 苏州工业园区伍格工业炉有限公司 | Automatic feeding frame for mesh belt type normalizing furnace |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114480793A (en) * | 2021-12-23 | 2022-05-13 | 江苏理研科技股份有限公司 | Multifunctional heat treatment furnace and control method thereof |
| CN117210649A (en) * | 2023-09-21 | 2023-12-12 | 中科卓异环境科技(东莞)有限公司 | Steel normalizing equipment and steel normalizing method |
| CN117210649B (en) * | 2023-09-21 | 2024-05-14 | 中科卓异环境科技(东莞)有限公司 | Steel normalizing equipment and steel normalizing method |
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