CN109694995A - A kind of preparation method for the Cr5 swaged forging steel working roll rolling very thin material - Google Patents
A kind of preparation method for the Cr5 swaged forging steel working roll rolling very thin material Download PDFInfo
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- CN109694995A CN109694995A CN201811644535.7A CN201811644535A CN109694995A CN 109694995 A CN109694995 A CN 109694995A CN 201811644535 A CN201811644535 A CN 201811644535A CN 109694995 A CN109694995 A CN 109694995A
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- air inlet
- deep cooling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
-
- 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
- C21D6/04—Hardening by cooling below 0 degrees Celsius
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Abstract
The invention discloses a kind of preparation methods of Cr5 swaged forging steel working roll for rolling very thin material to handle between -190 to -195 DEG C by the way that roll is put into cryogenic treatment apparatus after quenching, and uses corollary equipment；By sediment tube and blowing device, the nitrogen for being deposited in bottom is blown back to deep cooling box again, reduce the use of liquid nitrogen, while also promoting the movement of gas in deep cooling box.Also nitrogen is dredged while preventing liquid nitrogen direct-injection by the way that hood for protecting rider is arranged, makes the more uniform of nitrogen dispersion.In addition, driving air inlet cylinder rotation by driving device, nitrogen is led at roll by air inlet cylinder, so that roll is cooled uniformly, improves deep cooling quality；Impeller is set in air inlet drum outer wall simultaneously, the driving force for borrowing air inlet cylinder makes wheel rotation, promotes the movement of gas in deep cooling box, keeps gas distribution more uniform；And it is not necessarily to extra power, it reduces costs.
Description
Technical field
The present invention relates to a kind of rolls and preparation method thereof, more particularly to a kind of Cr5 swaged forging steel for rolling very thin material
Working roll and preparation method thereof.
Background technique
Currently, many occasions needs use the very thin material of high-precision, such as with a thickness of 0.01mm~0.1mm, aluminium foil etc., give birth to
Very high to the requirement of technology and equipment during production, working roll therein needs to reach high hardness number, uniformity and intensity,
Very thin aluminium foil can just be rolled out.The decision of roll material will be determined that cold roll is due in work by its operating condition
Surface is by very high service load when making, therefore roll material must have very high intensity, works at the same time roller during the work time
There is mutual friction between rolling stock and backing roll, therefore working roll material there must be higher wear-resisting property；Work
Roller also frequently encounters rolling accident during the rolling process, so working roll must also have higher anti-accident performance.However mesh
Before, the working roll of very thin material is rolled, hardness number, uniformity and intensity value cannot be taken into account very well, and hardness number is generally in 90-
95HSD, effective depth of hardening cause the product became uneven rolled out, surface quality is poor, in addition work roll cooling in 10-20mm
Middle peeling and crackle tendency are serious, and the rolling service life is low.
In roll casting, carbon is important alloying element, by being solid-solubilized in the matrix of steel, plays the reinforcing to steel and makees
With, while the other elements in part carbon and steel form carbide, play the role of reinforcing and increase wearability.Chemical component chromium
Content can be improved the mechanical property and wearability, the hardness, elasticity, the corrosion-resistant and heat resistance that increase steel of steel, improve surface
Harden ability；But the disadvantage is that reducing the toughness of roll while improving.In addition, being set when cast steel roll solidifies due to existing
Dendrite will cause the microsegregation of alloying component, with increasing for alloy cast steel roll alloy content, what when solidification generated
It is segregated index to increase, causes the degree of irregularity of ingredient also bigger.In order to spread the atom of alloying element sufficiently, ingredient is obtained
Uniform austenite, the step of to be heat-treated after casting technique.Common heat treatment type has: stress relief annealing, etc.
Warm ball annealing, diffusion annealing, normalizing, tempering, quenching, subzero treatment.The technological parameters such as reaction temperature, time in each step
It is the key that determine roll product hardness, uniformity, intensity value.
To sum up, there is harsh requirement for work roll surface flatness, hardness, needs to improve treatment preparation method thereof.
Summary of the invention
For the above defect of the existing technology, it is a primary object of the present invention to overcome the deficiencies in the prior art it
Place, discloses a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material, includes the following steps,
1) raw material is grouped as according to the group of weight percent: carbon: 0.6-1wt%, silicon: 0.5-1.2wt%, manganese: 0.2-
0.5wt%, phosphorus :≤0.03wt%, sulphur :≤0.02wt%, chromium: 5.5-6.5wt%, molybdenum: 0.3-0.7wt%, vanadium: 0.05-
0.25wt%, surplus are iron and other impurities；
Raw material is placed in melting in medium-frequency induction furnace, is sufficiently stirred, smelting temperature is 1600-1800 DEG C, smelting time
It is 30-40 minutes, alloy liquid is made；
2) hole of coming down in torrents for opening the intermediate frequency furnace, alloy liquid is cast in metal die；
3) metal die is removed after cooling down completely, forms blank；
4) by the blank on press forging molding；
5) ultrasonic examination is carried out after annealing；
6) rough turn processing, ultrasonic examination；
7) semifinishing, ultrasonic examination；
8) it quenches；
9) subzero treatment；
10) defrost, tempering；
11) finishing, double tempering, ultrasonic examination；
12) detection storage.
Wherein, quenched roll is put into cryogenic treatment apparatus by the subzero treatment of step 9), and temperature is -190 to -195
DEG C, keep the temperature 4-5 hours:
The cryogenic treatment apparatus includes setting deep cooling box on the ground, the sediment tube that underground horizontal setting is arranged in, institute
It states deep cooling box to be connected to the sediment tube, blowing device is arranged in one end of the sediment tube, and the other end extends to institute by pipeline
The top of the roll in deep cooling box is stated, liquid nitrogen entrance is arranged in the side wall of the deep cooling box.
Further right, the blowing device includes impeller and motor, wheel rotation described in the motor driven.
It is further right, it further include driving device and air inlet cylinder, the air inlet cylinder is sleeved on outside roll, and the driving device is set
It sets on the deep cooling box, drives the air inlet cylinder rotation.
It is further right, the driving device include be arranged in ring-shaped guide rail at the top of the deep cooling box, setting it is described into
On air duct with the matched sliding block of the ring-shaped guide rail, the transmission gear and the driving transmission gear that are arranged on the air inlet cylinder
The actuator of rotation drives the transmission gear rotation to rotate the air inlet cylinder using the actuator.
Further right, the air inlet of several protrusions is arranged in array on the air inlet cylinder side wall.
Further right, the lower part setting of the air inlet cylinder is for making the impeller of nitrogen movement outside the air inlet cylinder.
Further right, the deep cooling box bottom is filter plate, and the deep cooling box passes through funnel-form connection pool and the sediment tube
Side wall connection.
It is further right, further include the hood for protecting rider for preventing liquid nitrogen direct-injection, several filter hole are set on the hood for protecting rider.
Further right, the inlet side of the blowing device between pipeline and the hood for protecting rider and the deep cooling box by connecting
It is logical.
It is further right, disperser is set above roll, and the disperser is in cone.
It is that the present invention obtains the utility model has the advantages that
Deep cold treatment apparatus used in the preparation method of working roll provided by the present invention, including sediment tube and blowing
Device blows back the nitrogen for being deposited in bottom to deep cooling box again, reduces the use of liquid nitrogen, while also promoting deep cooling box
The movement of interior gas.Also nitrogen is dredged while preventing liquid nitrogen direct-injection by the way that hood for protecting rider is arranged, makes nitrogen point
Scattered is more uniform.In addition, driving air inlet cylinder rotation by driving device, nitrogen is led at roll by air inlet cylinder, into one
Step makes roll be cooled uniformly, improves deep cooling quality；Impeller is set in air inlet drum outer wall simultaneously, the driving force for borrowing air inlet cylinder makes leaf
Wheel rotation, promotes the movement of gas in deep cooling box, keeps gas distribution more uniform；And it is not necessarily to extra power, it reduces costs.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of cryogenic treatment apparatus；
Fig. 2 is the structural schematic diagram of driving device；
Fig. 3 is the top view for entering the wind cylinder；
Fig. 4 is the structural schematic diagram of blowing device；
Appended drawing reference is as follows:
1, deep cooling box, 2, sediment tube, 3, blowing device, 4, driving device, 5, air inlet cylinder, 6, impeller, 7, connection pool, 8, screening
Block cover, 9, disperser, 10, roll, 31, impeller, 32, motor, 41, ring-shaped guide rail, 42, sliding block, 43, transmission gear, 44, actuating
Device, 51, air inlet.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, right with reference to the accompanying drawings and embodiments
The present invention is described in further detail.It should be appreciated that described herein, specific examples are only used to explain the present invention, and does not have to
It is of the invention in limiting.
Embodiment 1
According to weight ratio be carbon: 0.6wt%, silicon: 1.2wt%, manganese: 0.2wt%, phosphorus: 0.03wt%, sulphur: 0.02wt%,
Chromium: 5.5wt%, molybdenum: 0.3wt%, vanadium: 0.05wt%, surplus are iron and other impurities, residual copper content no more than 0.2%, its
His impurity lead, tin, arsenic, bismuth etc. prepare founding materials no more than 0.02%.
Each group: being placed in melting in intermediate frequency furnace by molten alloy solution by above-mentioned weight ratio, smelting temperature 1600
DEG C, smelting time is 30 minutes, and alloy solution is made.
Detection: using spectra methods detection melting complete alloy liquid, determine its ingredient within the scope of.
Casting cold cogging: the hole of coming down in torrents of the power frequency holding furnace is opened, alloy liquid is cast in metal die, to complete
The metal die is removed after full cooling.
It scrubs forging: process being scrubbed by pickling, removes remained on surface and oxide, the forging molding on press.
Annealing, ultrasonic examination: after annealing, the depths of metal material can be penetrated using ultrasound, and entered separately by a section
When one section, part defect is checked the characteristics of interface edge reflects.Then rough turn processing is carried out, above-mentioned ultrasound is repeated
Wave inspection.Modifier treatment is carried out later.
Modifier treatment: since induction heating speed is fast, austenite transition temperature is increased, and the concentration of carbon difference in austenite increases
Greatly.Steel original structure is coarse, and when more containing bulk ferrite, former bulk ferrite position often becomes after austenitizing
Poor carbon austenitic, hardness decline.Therefore, conditioning treatment is carried out before quenching, can be obtained tiny, uniform tissue, be made to roll
Roller core portion and roll neck reach good mechanical properties, improve the yield tensile ratio of roll, effectively improve roll fatigue life；After being simultaneously
Tissue preparation is done in the quenching of phase roller surface, and quenched roll parts carbide dispersion later is precipitated, these carbide are on final surface
In quenching, it is more easier to dissolve；And matrix can be improved, especially the distribution of carbide.Former holding temperature is 860
Degree, is now adjusted to 900 degree, and soaking time is also lengthened to 10 hours, and former tempering temperature roller surface hardness reaches 45-48HSD, existing
Same tempering temperature, surface hardness can reach 49-52HSD, and opposite rolls mechanical performance increases therewith.
Semifinishing, ultrasonic examination are carried out after modifier treatment: according to processing drawing requirement, half essence is carried out on lathe
It processes, when can penetrate the depths of metal material using ultrasound, and enter another section by a section, is reflected in interface edge
The characteristics of check part defect.Then it is quenched.
Quenching: on quenching machine, by the roll by preheating, when by the induction coil of energization, due to electromagnetic induction
Form induced current in roller surface makes so that surface is heated by thermometric feedback adjustment power regulation heating temperature
Roller surface obtains certain depth of hardening zone and good uniformity of hardness, reduces roll internal stress by average tempering,
The peeling in work roll cooling is reduced, the usability of intermediate calender rolls is substantially increased.
Hardening heat is 960 degree.Then subzero treatment is carried out.
Subzero treatment: this process makes to be tempered the interior progress of cryogenic treatment apparatus that pervious roll is put into -190 after quenching
Deep cooling keeps the temperature 4 hours processes, with the increase of alloy content in roll, by subzero treatment, allows portion of residual Ovshinsky
Body is transformed into martensite, so the subzero treatment of roll is the continuity of quenching, because chromium content increase will lead to poor toughness,
On the basis of the content of chromium and carbon of the invention, the retained austenite that -190 to -195 DEG C of cryogenic temperature can reduce in roll contains
Amount to reach the wearability, high rigidity and raising depth of hardening zone of roller surface, while also increasing toughness, improves roll and exist
Resistance to flaking in later period use reduces the risk of fracture of roller.
Then defrost, tempering are carried out: being tempered at 100 DEG C after defrost, tempering time 60 hours.
Then finishing, double tempering, ultrasonic examination: the double tempering after finishing processing, tempering temperature 100 are completed
DEG C, tempering time 180 is hour.When can penetrate the depths of metal material using ultrasound, and enter another section by a section,
The characteristics of interface edge reflects checks part defect.
According to roll prepared by above-mentioned production technology, depth of hardening zone reaches 35mm, and body surface hardness number is reaching
102HSD, the hardness uniformity are less than 1.5HSD, and the working roll that can be used for rolling very thin material uses.The replacement cycle of roll is from 25
Kilometer increases to 42 kilometers, and can roll out the very thin material of high-precision.
Embodiment 2
According to weight ratio be carbon: 1wt%, silicon: 0.5wt%, manganese: 0.5wt%, phosphorus: 0.02wt%, sulphur: 0.015wt%,
Chromium: 6.5wt%, molybdenum: 0.7wt%, vanadium: 0.25wt%, surplus are iron and other impurities, residual copper content no more than 0.2%, its
His impurity lead, tin, arsenic, bismuth etc. prepare founding materials no more than 0.02%.
Each group: being placed in melting in intermediate frequency furnace by molten alloy solution by above-mentioned weight ratio, smelting temperature 1800
DEG C, smelting time is 40 minutes, and alloy solution is made.
Detection: using spectra methods detection melting complete alloy liquid, determine its ingredient within the scope of.
Casting cold cogging: the hole of coming down in torrents of the power frequency holding furnace is opened, alloy liquid is cast in metal die, to complete
The metal die is removed after full cooling.
It scrubs forging: process being scrubbed by pickling, removes remained on surface and oxide, the forging molding on press.
Annealing, ultrasonic examination: after annealing, the depths of metal material can be penetrated using ultrasound, and entered separately by a section
When one section, part defect is checked the characteristics of interface edge reflects.Then rough turn processing is carried out, above-mentioned ultrasound is repeated
Wave inspection.Modifier treatment is carried out later.
Modifier treatment: holding temperature is 960 DEG C, and soaking time is 5 hours.
Semifinishing, ultrasonic examination are carried out after modifier treatment: according to processing drawing requirement, half essence is carried out on lathe
It processes, when can penetrate the depths of metal material using ultrasound, and enter another section by a section, is reflected in interface edge
The characteristics of check part defect.Then it is quenched.
Quenching: hardening heat is 960 degree.Then subzero treatment is carried out.
Subzero treatment: the pervious roll of tempering after quenching is put into progress deep cooling guarantor in -195 DEG C of cryogenic treatment apparatus
Temperature 5 hours.
Then defrost, tempering are carried out: being tempered at 150 DEG C after defrost, tempering time 90 hours.
Then finishing, double tempering, ultrasonic examination: the double tempering after finishing processing, tempering temperature 120 are completed
DEG C, tempering time 180 is hour.When can penetrate the depths of metal material using ultrasound, and enter another section by a section,
The characteristics of interface edge reflects checks part defect.
According to roll prepared by above-mentioned production technology, depth of hardening zone reaches 40mm, and body surface hardness number is reaching
100HSD, the hardness uniformity are less than 1.5HSD, and the working roll that can be used for rolling very thin material uses.The replacement cycle of roll increases
To 42 kilometers, and the very thin material of high-precision can be rolled out.
Embodiment 3
According to weight ratio be carbon: 0.8wt%, silicon: 1.05wt%, manganese: 0.25wt%, phosphorus: 0.03wt%, sulphur:
0.02wt%, chromium: 5.7wt%, molybdenum: 0.4wt%, vanadium: 0.1wt%, surplus are iron and other impurities, and residual copper content is not more than
0.2%, other impurities lead, tin, arsenic, bismuth etc. prepare founding materials no more than 0.02%.
Each group: being placed in melting in intermediate frequency furnace by molten alloy solution by above-mentioned weight ratio, smelting temperature 1800
DEG C, smelting time is 40 minutes, and alloy solution is made.
Detection: using spectra methods detection melting complete alloy liquid, determine its ingredient within the scope of.
Casting cold cogging: the hole of coming down in torrents of the power frequency holding furnace is opened, alloy liquid is cast in metal die, to complete
The metal die is removed after full cooling.
It scrubs forging: process being scrubbed by pickling, removes remained on surface and oxide, the forging molding on press.
Annealing, ultrasonic examination: after annealing, the depths of metal material can be penetrated using ultrasound, and entered separately by a section
When one section, part defect is checked the characteristics of interface edge reflects.Then rough turn processing is carried out, above-mentioned ultrasound is repeated
Wave inspection.Modifier treatment is carried out later.
Modifier treatment: holding temperature is 960 DEG C, and soaking time is 5 hours.
Semifinishing, ultrasonic examination are carried out after modifier treatment: according to processing drawing requirement, half essence is carried out on lathe
It processes, when can penetrate the depths of metal material using ultrasound, and enter another section by a section, is reflected in interface edge
The characteristics of check part defect.Then it is quenched.
Quenching: hardening heat is 960 degree.Then subzero treatment is carried out.
Subzero treatment: the pervious roll of tempering after quenching is put into progress deep cooling guarantor in -190 DEG C of cryogenic treatment apparatus
Temperature 5 hours.
Then defrost, tempering are carried out: being tempered at 150 DEG C after defrost, tempering time 90 hours.
Then finishing, double tempering, ultrasonic examination: the double tempering after finishing processing, tempering temperature 100 are completed
DEG C, tempering time 180 is hour.When can penetrate the depths of metal material using ultrasound, and enter another section by a section,
The characteristics of interface edge reflects checks part defect.
According to roll prepared by above-mentioned production technology, depth of hardening zone reaches 45mm, and body surface hardness number is reaching
102HSD, the hardness uniformity are less than 1.5HSD, and the working roll that can be used for rolling very thin material uses.The replacement cycle of roll increases
To 42 kilometers, and the very thin material of high-precision can be rolled out.
Embodiment 4
According to weight ratio be carbon: 0.95wt%, silicon: 0.85wt%, manganese: 0.45wt%, phosphorus: 0.01wt%, sulphur:
0.015wt%, chromium: 6.1wt%, molybdenum: 0.6wt%, vanadium: 0.2wt%, surplus are iron and other impurities, and residual copper content is little
In 0.2%, other impurities lead, tin, arsenic, bismuth etc. no more than 0.02%, prepare founding materials.
Each group: being placed in melting in intermediate frequency furnace by molten alloy solution by above-mentioned weight ratio, smelting temperature 1800
DEG C, smelting time is 40 minutes, and alloy solution is made.
Detection: using spectra methods detection melting complete alloy liquid, determine its ingredient within the scope of.
Casting cold cogging: the hole of coming down in torrents of the power frequency holding furnace is opened, alloy liquid is cast in metal die, to complete
The metal die is removed after full cooling.
It scrubs forging: process being scrubbed by pickling, removes remained on surface and oxide, the forging molding on press.
Annealing, ultrasonic examination: after annealing, the depths of metal material can be penetrated using ultrasound, and entered separately by a section
When one section, part defect is checked the characteristics of interface edge reflects.Then rough turn processing is carried out, above-mentioned ultrasound is repeated
Wave inspection.Modifier treatment is carried out later.
Modifier treatment: holding temperature is 960 DEG C, and soaking time is 5 hours.
Semifinishing, ultrasonic examination are carried out after modifier treatment: according to processing drawing requirement, half essence is carried out on lathe
It processes, when can penetrate the depths of metal material using ultrasound, and enter another section by a section, is reflected in interface edge
The characteristics of check part defect.Then it is quenched.
Quenching: hardening heat is 960 degree.Then subzero treatment is carried out.
Subzero treatment: the pervious roll of tempering after quenching is put into progress deep cooling guarantor in -190 DEG C of cryogenic treatment apparatus
Temperature 5 hours.
Then defrost, tempering are carried out: being tempered at 150 DEG C after defrost, tempering time 90 hours.
Then finishing, double tempering, ultrasonic examination: the double tempering after finishing processing, tempering temperature 100 are completed
DEG C, tempering time 180 is hour.When can penetrate the depths of metal material using ultrasound, and enter another section by a section,
The characteristics of interface edge reflects checks part defect.
According to roll prepared by above-mentioned production technology, depth of hardening zone reaches 45mm, and body surface hardness number is reaching
102HSD, the hardness uniformity are less than 1.5HSD, and the working roll that can be used for rolling very thin material uses.The replacement cycle of roll increases
To 42 kilometers, and the very thin material of high-precision can be rolled out.
Embodiment 5
According to weight ratio be carbon: 0.9wt%, silicon: 0.9wt%, manganese: 0.3wt%, phosphorus: 0.01wt%, sulphur 0.015wt%,
Chromium: 6wt%, molybdenum: 0.5wt%, vanadium: 0.15wt%, surplus are iron and other impurities, residual copper content no more than 0.2%, other
Impurity lead, tin, arsenic, bismuth etc. prepare founding materials no more than 0.02%.
Each group: being placed in melting in intermediate frequency furnace by molten alloy solution by above-mentioned weight ratio, smelting temperature 1700
DEG C, smelting time is 40 minutes, and alloy solution is made.
Detection: using spectra methods detection melting complete alloy liquid, determine its ingredient within the scope of.
Casting cold cogging: the hole of coming down in torrents of the power frequency holding furnace is opened, alloy liquid is cast in metal die, to complete
The metal die is removed after full cooling.
It scrubs forging: process being scrubbed by pickling, removes remained on surface and oxide, the forging molding on press.
Annealing, ultrasonic examination: after annealing, the depths of metal material can be penetrated using ultrasound, and entered separately by a section
When one section, part defect is checked the characteristics of interface edge reflects.Then rough turn processing is carried out, above-mentioned ultrasound is repeated
Wave inspection.Modifier treatment is carried out later.
Modifier treatment: holding temperature is 930 DEG C, and soaking time is 10 hours.
Semifinishing, ultrasonic examination are carried out after modifier treatment: according to processing drawing requirement, half essence is carried out on lathe
It processes, when can penetrate the depths of metal material using ultrasound, and enter another section by a section, is reflected in interface edge
The characteristics of check part defect.Then it is quenched.
Quenching: hardening heat is 960 degree.Then subzero treatment is carried out.
Subzero treatment: the pervious roll of tempering after quenching is put into progress deep cooling guarantor in -195 DEG C of cryogenic treatment apparatus
Temperature 4 hours.
Then defrost, tempering are carried out: being tempered at 100 DEG C after defrost, tempering time 90 hours.
Then finishing, double tempering, ultrasonic examination: the double tempering after finishing processing, tempering temperature 120 are completed
DEG C, tempering time 180 is hour.When can penetrate the depths of metal material using ultrasound, and enter another section by a section,
The characteristics of interface edge reflects checks part defect.
According to roll prepared by above-mentioned production technology, depth of hardening zone reaches 40mm, and body surface hardness number is reaching
102HSD, the hardness uniformity are less than 1.5HSD, and the working roll that can be used for rolling very thin material uses.The replacement cycle of roll increases
To 42 kilometers, and the very thin material of high-precision can be rolled out.
Wherein, cryogenic treatment apparatus, as shown in Figs 1-4, including deep cooling box 1 on the ground is arranged, is arranged in underground horizontal
Deep cooling box 1 and ground level are facilitated roll 10 to be carried in deep cooling box 1 by the sediment tube 2 of setting.Deep cooling box 1 and sediment tube 2
Connection, cold air are sunken to 1 bottom of deep cooling box, and bottom temp is too low compared to upper temp, not can guarantee roll 10 and are cooled uniformly, use
Setting sediment tube 2 is crossed, so that nitrogen will not be gathered in 10 lower end of roll.In addition, blowing device 3 is set in one end of sediment tube 2,
The other end extends to the top of the roll 10 inside deep cooling box 1 by pipeline, and nitrogen is recycled in deep cooling box 1, continues to recycle
It utilizes, and then energy saving；Meanwhile from top, entrance can be such that nitrogen comes into full contact with roll 10 to nitrogen.It is arranged on deep cooling box 1
Liquid nitrogen entrance, connect with liquid nitrogen container, and liquid nitrogen spray is entered in deep cooling box 1, is processed to roll 10.
It in one embodiment, further include driving device 4 and air inlet cylinder 5, air inlet cylinder 5 is sleeved on outside roll 10, driving device 4
It is arranged on deep cooling box 1, driving air inlet cylinder 5 rotates the nitrogen made enter the wind outside cylinder 5 and is sucked into air inlet cylinder 5 by air inlet cylinder 5.Air inlet
Nitrogen in cylinder 5 is more steady relative to the nitrogen outside air inlet cylinder 5, and roll 10 is further made to be cooled uniformly.Specifically, driving
Device 4 includes the ring-shaped guide rail 41 that 1 top of deep cooling box is arranged in, is arranged on air inlet cylinder 5 and the matched sliding block of ring-shaped guide rail 41
42, the actuator 44 that transmission gear 43 and the driving transmission gear 43 being arranged on air inlet cylinder 5 rotate, wherein transmission gear 43
The upper end of air inlet cylinder 5, and prominent and deep cooling box 1 are set.Actuator 44 includes motor and gear, and motor is arranged by bracket
It on deep cooling box 1, is engaged by gear with transmission gear 43, is rotated by motor driven transmission gear 43, make 5 turns of cylinder of air inlet
It is dynamic.All activated apparatus are arranged at outside deep cooling box 1, activated apparatus is further protected, improve its service life, reduces and adds
Work cost.
In one embodiment, the air inlet 51 that several protrusions are arranged in array on 5 side wall of cylinder is entered the wind, as shown in figure 3,
Specifically, air inlet 51, in bowl-shape, by entering the wind the rotation of cylinder 5, air inlet 51 buckles into nitrogen in air inlet cylinder 5.It will be appreciated that
, as long as the slanting baffle of protrusion is arranged on the side wall of air inlet cylinder 5, by entering the wind the rotation of cylinder 5, introduce nitrogen gas into air inlet cylinder 5
It is interior.
In a preferred embodiment, impeller 6 is arranged in the lower part for entering the wind cylinder 5, and the impeller 6 is for dispelling outside air inlet cylinder 5
Nitrogen makes its movement.It is colder to accumulate in lower section because if outer, stationary is motionless, make non-uniform temperature up and down.Therefore,
Impeller 6 is set on air inlet cylinder 5, impeller 6 can be driven without additional power and rotate, promote the movement of nitrogen.
In one embodiment, as shown in figure 4, blowing device 3 includes impeller 31 and motor 32, impeller is driven by motor 32
31 rotations, make it generate wind, are guided by sediment tube 2, and the nitrogen that deep cooling box 1 flows into sediment tube 2 is drained into again by pipeline
The top of deep cooling box 1.In general, 3 air inlet of blowing device passes through atmosphere air inlet, but also will increase the consumption of liquid nitrogen in this way, therefore,
The inlet side of impeller 31 by pipeline and deep cooling box 1 close to liquid nitrogen inlet, further prevent colder nitrogen accumulation in bottom
While, driving nitrogen comes back to 1 top of deep cooling box and cools down to roll 10.Meanwhile, it is capable to expect, motor 32 drives
Impeller 31 rotates, and impeller 31 rotates, and from inlet side air-breathing, air side jet, the nitrogen for flowing to inlet side is immediately inhaled by impeller 31
It walks, and then protects the damage for reducing nitrogen to motor 32.
In one embodiment, 1 bottom of deep cooling box be filter plate, deep cooling box 1 nitrogen is gathered by funnel-form connection pool 7 send to
In sediment tube 2.
In one embodiment, liquid nitrogen is sprayed from liquid nitrogen entrance, be might have part liquid nitrogen and is injected directly on roll 10.Meeting
It causes 10 Local cooling of roll excessive, influences the quality of roll 10.Therefore, further include hood for protecting rider 8 for preventing liquid nitrogen direct-injection,
Several filter hole are set on hood for protecting rider 8.Firstly, hood for protecting rider 8 prevents liquid nitrogen direct-injection, the protective effect to roll 10 is played, separately
Outside, by be arranged filter hole, make liquid nitrogen gasify between deep cooling box 1 and hood for protecting rider 8 stabilization after, uniformly entered from filter hole
In hood for protecting rider 8, filter hole plays elicitation effect.
In a preferred embodiment, the inlet side of blowing device 3 between pipeline and hood for protecting rider 8 and deep cooling box 1 by being connected to.
In one embodiment, the nitrogen of 10 top of roll carries out blow-through to roll 10 in order to prevent, therefore, on roll 10
Side's setting disperser 9, disperser 9 are in cone, and nitrogen is guided from centre to its surrounding.Distinguish nitrogen more uniform,
Further ensure cooling effect.
It in one embodiment, further include relief valve (not shown), to guarantee the air pressure in deep cooling box 1 in safe range,
Prevent unexpected generation.
In the use of the present invention, roll 10 is placed in air inlet cylinder 5, starting device, liquid nitrogen is entered by liquid nitrogen entrance
In deep cooling box 1, blocking and current stabilization by hood for protecting rider 8 enter stable nitrogen in hood for protecting rider 8, are rotated by air inlet cylinder 5,
By in the nitrogen sucking air inlet cylinder 5 in hood for protecting rider 8, nitrogen is cooled down, by multistage current stabilization, roll 10 is enable to be cooled
It is even.The nitrogen for accumulating in air inlet 5 bottom of cylinder simultaneously is flowed into sedimentation basin 2 by connection pool 7, by blowing device 3 by hood for protecting rider 8
The top of deep cooling box 1 is squeezed into outer nitrogen sucking again after mixing with the nitrogen that air inlet cylinder 5 gathers, cooled down again to roll 10,
And by the nitrogen poured, promote the gas motion in deep cooling box 1.Meanwhile while entering the wind the rotation of cylinder 5, also promote deep
Nitrogen movement in ice chest 1, avoids the bottom wall for accumulating in deep cooling box 1, causes roll 10 to be cooled unevenness, influence deep cooling quality.
The foregoing is merely a prefered embodiment of the invention, practical range not for the purpose of limiting the invention；If not departing from this
The spirit and scope of invention, modify or equivalently replace the present invention, and should all cover the protection in the claims in the present invention
In range.
Claims (10)
1. a kind of preparation method for the Cr5 swaged forging steel working roll for rolling very thin material, which is characterized in that include the following steps,
1) raw material is grouped as according to the group of weight percent: carbon: 0.6-1wt%, silicon: 0.5-1.2wt%, manganese: 0.2-
0.5wt%, phosphorus :≤0.03wt%, sulphur :≤0.02wt%, chromium: 5.5-6.5wt%, molybdenum: 0.3-0.7wt%, vanadium: 0.05-
0.25wt%, surplus are iron and other impurities；
Raw material is placed in melting in medium-frequency induction furnace, is sufficiently stirred, smelting temperature is 1600-1800 DEG C, smelting time 30-
40 minutes, alloy liquid is made；
2) hole of coming down in torrents for opening the intermediate frequency furnace, alloy liquid is cast in metal die；
3) metal die is removed after cooling down completely, forms blank；
4) by the blank on press forging molding；
5) ultrasonic examination is carried out after annealing；
6) rough turn processing, ultrasonic examination；
7) semifinishing, ultrasonic examination；
8) it quenches；
9) subzero treatment；
10) defrost, tempering；
11) finishing, double tempering, ultrasonic examination；
12) detection storage；
Wherein, quenched roll is put into cryogenic treatment apparatus by the subzero treatment of step 9), and temperature is -190 to -195 DEG C,
Heat preservation 4-5 hours:
The cryogenic treatment apparatus includes setting deep cooling box on the ground, the sediment tube that underground horizontal setting is arranged in, the depth
Ice chest is connected to the sediment tube, and blowing device is arranged in one end of the sediment tube, and the other end extends to the depth by pipeline
Liquid nitrogen entrance is arranged in the side wall of the top of roll in ice chest, the deep cooling box.
2. a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material according to claim 1, feature exist
In the blowing device includes impeller and motor, wheel rotation described in the motor driven.
3. a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material according to claim 1, feature exist
In further including driving device and air inlet cylinder, the air inlet cylinder is sleeved on outside roll, and the driving device setting is in the deep cooling box
On, drive the air inlet cylinder rotation.
4. a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material according to claim 3, feature exist
In the driving device includes that the ring-shaped guide rail at the top of the deep cooling box is arranged in, is arranged on the air inlet cylinder and the ring
The actuator of the sliding block of shape guide rail, the transmission gear being arranged on the air inlet cylinder and the driving transmission gear rotation,
The transmission gear rotation is driven to rotate the air inlet cylinder using the actuator.
5. a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material according to claim 3, feature exist
In the air inlet of several protrusions is arranged in array on the air inlet cylinder side wall.
6. a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material according to claim 3, feature exist
In the lower part setting of the air inlet cylinder is for making the impeller of nitrogen movement outside the air inlet cylinder.
7. a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material according to claim 1, feature exist
In the deep cooling box bottom is filter plate, and the deep cooling box is connected to by funnel-form connection pool with the sediment tube side wall.
8. a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material according to claim 1, feature exist
In further including the hood for protecting rider for preventing liquid nitrogen direct-injection, several filter hole be arranged on the hood for protecting rider.
9. a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material according to claim 8, feature exist
In the inlet side of the blowing device between pipeline and the hood for protecting rider and the deep cooling box by being connected to.
10. a kind of preparation method of Cr5 swaged forging steel working roll for rolling very thin material according to claim 1, feature
It is, disperser is arranged above roll, and the disperser is in cone.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207510A (en) * | 2020-09-14 | 2021-01-12 | 襄阳顺特阳光科技有限公司 | Method for machining stainless steel intercooling air inlet pipe |
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| JPS6041131B2 (en) * | 1976-06-23 | 1985-09-14 | 株式会社日立製作所 | Rigid rotary sub-zero processing method |
| CN201261795Y (en) * | 2008-09-18 | 2009-06-24 | 浙江工业大学 | Well type cryogenic treatment apparatus |
| CN104120341A (en) * | 2014-08-12 | 2014-10-29 | 江苏润孚机械轧辊制造有限公司 | Cr5 steel forging work roll for rolling extremely thin materials and preparation method thereof |
| CN104328264A (en) * | 2014-10-29 | 2015-02-04 | 天津市热处理研究所有限公司 | Cold treatment box of roller |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6041131B2 (en) * | 1976-06-23 | 1985-09-14 | 株式会社日立製作所 | Rigid rotary sub-zero processing method |
| CN201261795Y (en) * | 2008-09-18 | 2009-06-24 | 浙江工业大学 | Well type cryogenic treatment apparatus |
| CN104120341A (en) * | 2014-08-12 | 2014-10-29 | 江苏润孚机械轧辊制造有限公司 | Cr5 steel forging work roll for rolling extremely thin materials and preparation method thereof |
| CN104328264A (en) * | 2014-10-29 | 2015-02-04 | 天津市热处理研究所有限公司 | Cold treatment box of roller |
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| CN112207510A (en) * | 2020-09-14 | 2021-01-12 | 襄阳顺特阳光科技有限公司 | Method for machining stainless steel intercooling air inlet pipe |
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| CN109694995B (en) | 2020-11-03 |
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