CN106282496A - A kind of Heavy Straightening Roller processing method - Google Patents
A kind of Heavy Straightening Roller processing method Download PDFInfo
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- CN106282496A CN106282496A CN201610796139.0A CN201610796139A CN106282496A CN 106282496 A CN106282496 A CN 106282496A CN 201610796139 A CN201610796139 A CN 201610796139A CN 106282496 A CN106282496 A CN 106282496A
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- roll
- quenching
- processing method
- straightening roller
- top board
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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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- 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
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
Abstract
The invention discloses a kind of Heavy Straightening Roller processing method, belong to smoothing roll manufacture field.The smoothing roll processing method of the present invention, 9Cr2Mo material is used to obtain finished product after modifier treatment, preliminary working, finished heat treatment, polish after forging processing, forging, wherein, use quenching frock that centre bore and the end face of the body of roll are sealed when finished heat treatment, and flatulence circle is set between top board and clamp nut, thus form effective sealing；When carrying out Quenching Treatment, first the body of roll is preheated, then the high-temperature gas in centre bore is discharged, then the body of roll is heated；Carry out quenching and repeatedly temper again.The present invention produces negative pressure in making body of roll centre bore, and hardening media cannot be introduced in end face and centre bore, and after quenching, body of roll firmness outside is high, and internal toughness is good, reduces deformation, effectively avoids the generation of crackle simultaneously.
Description
Technical field
The present invention relates to smoothing roll processing technique field, more particularly, it relates to a kind of Heavy Straightening Roller processing method.
Background technology
Straightener is that section bar, bar are carried out the plant equipment that aligning is processed, and its smoothing roll is critical component.For large-scale
For smoothing roll, it is relatively large in diameter, and outer surface requires have higher hardness, heart portion to need to keep preferable toughness, therefore, how
Carry out the heat treatment of smoothing roll, become key technology during production and processing.
For current smoothing roll, no matter roller footpath size, in order to improve its combination property, need to carry out integral quenching
Fire.For different materials and the concrete application of smoothing roll, can suitable selection shrend or oil quenching.For oil quenching, it is unsuitable for table
Surface hardness requires higher smoothing roll；For shrend, owing to its cooling is excessively fierce, cracking is easy to for some materials.But
No matter use which kind of integral quenching mode at present, all there is end face or the problem of overall cracking, particularly at grinding stage, table
Can there is annular crack in face, this crackle is also difficult to eliminate by grinding, can only carry out surface reconditioning.And it is the most serious for cracking
Workpiece, directly scrap, cause conforming product rate extremely low.
Entering Exploring Analysis to find, if there to be preferable performance, smoothing roll endoporus and end face can not carry out direct quenching,
Particularly in endoporus and the junction of end face, once touch hardening media, concentrated stress will be formed in junction, during the later stage
When effect processes, it is easy to cracking.Therefore, problem challenge is how the endoporus to smoothing roll and end face carry out quenching protection.
Finding through retrieval, the solution that in prior art, middle existence is relevant, such as number of patent application: ZL
200610106957.X, authorized announcement date: on July 8th, 2009, this patent formula discloses the biliquid of a kind of 9Gr2Mo smoothing roll
Quenching process, it prevents hardening media from entering endoporus by filling loess at the gap location of smoothing roll endoporus with frock
In, and with pressing plate, end face and endoporus are covered, quickly cool down first with shrend, prevent austenite decomposition, the most again in oil bath
Quench, reduce quenching distortion, prevent cracking.
This fill other materials with the method that prevents medium from entering the most conventional at smoothing roll endoporus, for
Deformation and cracking is prevented to have certain effect.But when tempering, inside stuffing can affect temperature, needs before tempering
Implant is removed, and operation is loaded down with trivial details.If but without implant, being difficult to again the shadow being prevented effectively from hardening media to quenching effect
Ring, cause manufacturing procedure to contradict with processing effect.
Summary of the invention
1. invention to solve the technical problem that
It is an object of the invention to overcome in prior art smoothing roll in the deficiency that crackle easily occurs after quenching, it is provided that
A kind of Heavy Straightening Roller processing method, the present invention is exhausted process after preheat, produces negative pressure, quench in making body of roll centre bore
Fire medium cannot be introduced in end face and centre bore, and after quenching, body of roll firmness outside is high, and internal toughness is good, effectively avoids crackle
Generation.
2. technical scheme
For reaching above-mentioned purpose, the technical scheme that the present invention provides is:
A kind of Heavy Straightening Roller processing method of the present embodiment, uses 9Cr2Mo material quenched after forging processing, forging
Finished product is obtained after process, preliminary working, finished heat treatment, polish；Wherein, quencher is utilized to put into during finished heat treatment
Row quenching protection, is first preheating to 580～650 DEG C, continues heating, finally carry out after then putting into row pump-down process by quencher
Quenching Treatment.
Further, it is 1000～1080 DEG C that forging adds the initial forging temperature in man-hour, and final forging temperature is 800～860 DEG C, forging
After be cooled to 720～760 DEG C after oil be cooled to 180～220 DEG C, then proceed to 680～700 DEG C of tempering.
Further, the detailed process of its finished heat treatment is:
1) body of roll after machining is inserted in the suspension rod of quenching frock, top board and flatulence are set in body of roll upper end
Circle, and between adjacent two parts, filled high-temperature is cotton, by clamp nut, the two ends of the body of roll is sealed；Install in suspension rod upper end and hang
Hook, hangs in heating furnace the body of roll；
2) it is warming up to 580～650 DEG C with stove, is incubated 1～3 hour；
3) body of roll is hung out, unscrew clamp nut and be exhausted, then tighten clamp nut, the body of roll is hung in heating furnace and continues
Continuous heating；Its exhaust process is:
A, the body of roll is hung out after, unscrew clamp nut；
B, slowly rotating top board, centre bore inner high voltage gas is discharged；
C, again screw clamp nut, in then the body of roll being hung in heating furnace, continue heating；
4) it is heated to 860～980 DEG C, is incubated 3～5 hours, then hangs out the body of roll and carry out Quenching Treatment；
5) step 4) quenching complete after carry out 2～3 temper.
Further, the downrod lower end of described quenching frock connects baffle plate, and suspension rod is set with lower platen, during use,
It is cotton that the both sides of lower platen are all filled with high temperature；Suspension rod middle and upper part is provided with external screw thread, top board and flatulence circle and is all sleeved on suspension rod
On, clamp nut is threadeded with suspension rod, cotton in top board and the both sides up and down of flatulence circle and the equal filled high-temperature of flatulence circle inner chamber.
Further, the sidewall of described clamp nut offers bayonet socket, and this card opening's edge clamp nut radial symmetric is distributed.
Further, described top board is provided with pull bar or draw ring, is used for mentioning top board aerofluxus.
Further, step 3) in exhaust process completed in 10 minutes.
Further, step 4) in Quenching Treatment process be: the body of roll is put into cooling water after heating furnace hangs out, 2～5
Sling after minute, during cooling places into cooling water for 2～6 minutes in atmosphere, 3～5 times the most repeatedly；Then the body of roll is hung in oil
Liquid cools down.
Further, step 4) in when quenching, the body of roll is put into cooling water after heating furnace hangs out, after 2～5 minutes
Sling, during cooling places into cooling water for 2～6 minutes in atmosphere, 3～5 times the most repeatedly；Then the body of roll is immersed in cooling water
Cool down.
3. beneficial effect
The technical scheme using the present invention to provide, compared with prior art, has the advantages that
(1) the Heavy Straightening Roller processing method of the present invention, controls, when forging, begin forging and final forging temperature, can use three piers
Three pull out the technology of forging, and modifier treatment after forging, and make steel interior tissue refine, and carbide can be uniformly distributed in disperse, obtains
Obtain preferable processing characteristics；During finished heat treatment, it is exhausted process after preheat, produces negative pressure in making body of roll centre bore, quench
Fire medium cannot be introduced in end face and centre bore, and after quenching, body of roll firmness outside is high, and internal toughness is good, effectively avoids crackle
Generation；
(2) the Heavy Straightening Roller processing method of the present invention, utilizes top board and flatulence circle to coordinate suspension rod to seal, pressing plate
It is prevented from hardening media to enter in end surface of roll and centre bore, thus avoids the hardenability within the body of roll；Heating
Time, first preheat, heat again after aerofluxus, it is possible to improve sealing further；Because gas is heated in body of roll centre bore
Rear air pressure increase, seal after aerofluxus, then when quenching, centre bore is internally formed negative pressure, make top board and under press
Plate is tightly attached to end surface of roll, and hardening media cannot be introduced into, thus end surface of roll and centre bore are formed protection；
(3) the Heavy Straightening Roller processing method of the present invention, has the closeest by filled high-temperature cotton in flatulence circle
Envelope effect, because mostly conventional seals is directly to tighten with bolt on pressing plate, and screw thread itself does not have sealing, and quenching is situated between
Gap between matter is easy to by screw thread enters into centre bore, and adds flatulence circle and high temperature cotton in the present invention, high temperature cotton energy
Enough fill up thread gaps, so that hardening media cannot penetrate into, it is ensured that there is preferable quenching effect；
(4) the Heavy Straightening Roller processing method of the present invention, first puts into the body of roll in cooling water when quenching and mentions,
Through repeatedly repeatable operation, make body surface hardness improve, then carry out oil cold, decrease the quenching distortion of the body of roll, effectively
The body of roll is prevented to ftracture, it is ensured that there is preferable toughness body of roll center；
(5) the Heavy Straightening Roller processing method of the present invention, carries out multiple low-temperature tempering after quenching, be incubated at least 6 hours,
By lonneal, the case hardness of smoothing roll being adjusted to setting, lonneal is the most abundant, and the toughness within smoothing roll is the best,
Thermal crack resistant ability is the highest.The increase of molybdenum content causes after quenching in steel containing more retained austenite, and after tempering, major part is residual
Remaining austenite is changed into again new martensite, is thus favorably improved roll hardness, strengthens wearability and to reduce wear surface coarse
Degree.
Accompanying drawing explanation
Fig. 1 is the quenching technical flow chart of the present invention；
Fig. 2 is the structural representation of frock of quenching in the present invention；
Fig. 3 is the structural representation that in the present invention, top board arranges cylindrical bar.
Label declaration in schematic diagram: 1, baffle plate；2, lower platen；3, the body of roll；4, top board；5, flatulence circle；6, high temperature is cotton；
7, clamp nut；8, bayonet socket；9, suspension rod.
Detailed description of the invention
For further appreciating that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
A kind of Heavy Straightening Roller processing method of the present embodiment, contained component and percentage by weight thereof in 9Cr2Mo smoothing roll
For C:0.85%, Si:0.23%, Mn:0.28%, Cr:2.1%, Mo:0.40%, P≤0.02, S≤0.02, remaining be ferrum and
Inevitable impurity.This material is become after modifier treatment, preliminary working, finished heat treatment, polish after forging processing, forging
Product.Wherein, it is 1000～1080 DEG C that forging adds the initial forging temperature in man-hour, and final forging temperature is 800～860 DEG C, modifier treatment after forging
It is that after after forging blank being cooled to 720～760 DEG C, oil is cooled to 180～220 DEG C, then proceeds to 680～700 DEG C of tempering.Warp
After crossing forging, modifier treatment makes steel interior tissue refine, and carbide can be uniformly distributed in disperse, it is thus achieved that preferably processing characteristics.Should
Material carries out heat treatment through forging after machining, utilizes quencher to put into row quenching protection in heat treatment process.
In conjunction with Fig. 2, the quenching frock used in the present embodiment, including suspension rod 9, lower platen 2, top board 4 and flatulence circle 5,
Suspension rod 9 lower end connects baffle plate 1, and suspension rod 9 is set with lower platen 2, and during use, the both sides of lower platen are all filled with high temperature cotton 6,
For sealing.Suspension rod 9 middle and upper part is provided with external screw thread, top board 4 and flatulence circle 5 and is all sleeved on suspension rod 9, and the body of roll 3 is set with
On suspension rod 9, and between lower platen 2 and top board 4, clamp nut 7 is threadeded with suspension rod 9, by clamp nut 7
Flatulence circle 5 and top board 4 are pressed on the body of roll 3 upper surface, thus form sealing, and end face and the centre bore of the body of roll 3 are the most capped, protect
The card end face of smoothing roll and centre bore will not be cooled quenching.In order to improve sealing property, upper at top board 4 and flatulence circle 5
Lower both sides and flatulence circle 5 inner chamber equal filled high-temperature cotton 6, i.e. between the body of roll 3 upper surface and top board 4, top board 4 and flatulence circle
Equal filled high-temperature cotton 6 between 5, between flatulence circle 5 and clamp nut 7, and in the internal filled high-temperature cotton 6 of flatulence circle 5.
Mostly common press-loading apparatus is directly fixation clip on body of roll upper surface, then hardening media is easy to pass through screw thread
In infiltration centre bore, after filled high-temperature cotton 6, it is ensured that sealing effectiveness.Suspension rod 9 upper end is provided with female thread, for connecting shackle.
If suspension hook and suspension rod are set to integrative-structure, then the body of roll 3 can only be set with from suspension rod 9 lower end, be unfavorable for that subsequent exhaust is grasped
Make.
By this quenching frock, to the quenching processing technology of smoothing roll it is:
1) body of roll 3 is inserted in suspension rod 9, top board 4 and flatulence circle 5 is set in the body of roll 3 upper end, and fills out between adjacent two parts
Fill high temperature cotton 6, sealed by the two ends of 7 bodies of roll 3 of clamp nut；Suspension hook is installed in suspension rod 9 upper end, the body of roll 3 is put into heating
Stove；
After being inserted in the body of roll 3, first cotton at the populated high temperature in lower platen 2 both sides, the most again in suspension rod 9 upper end on the body of roll 3
It is cotton that end is wound around high temperature, and top board 4 is being screwed off around high temperature cotton winding direction, spreads between top board 4 and the body of roll 3 upper surface
If high temperature is cotton；Subsequently flatulence circle 5 is screwed off around high temperature cotton winding direction, between flatulence circle 5 and top board 4, lay high temperature cotton；
Finally screw in clamp nut 7, between the external screw thread of clamp nut 7 and suspension rod 9, do not have high temperature cotton, but in clamp nut 7 and compression
High temperature cotton 6 is laid between nut 7.
2) it is warming up to 580～650 DEG C with stove, is incubated 1～3 hour；
First the body of roll 3 is heated to 580～650 DEG C preheat, due to the material of the body of roll 3 with vary in size, therefore temperature
Setting difference, general roller footpath is the least, heats the fastest, and preheating temperature is the lowest, and temperature retention time is the shortest, and the main purpose of insulation is
Guaranteeing that centre bore temperature is the most sufficiently high, in centre bore, air has pressure because expanding.
3) body of roll 3 is hung out, unscrew clamp nut 7 and be exhausted, then tighten clamp nut 7, the body of roll 3 is hung in heating
Stove continues heating；
The operation of its exhaust process is as follows:
A, the body of roll 3 is hung out after, unscrew clamp nut 7；
B, slowly rotation top board 4, rotational angle is less than 90 °, and centre bore inner high voltage gas is discharged；
C, again screw clamp nut 7, in then the body of roll 3 being hung in heating furnace, continue heating.
Whole exhaust process controls to complete in 10 minutes, it is to avoid the body of roll 3 excessive drop temperature starts hardening.After the body of roll 3 melts down
Continuing to be heated to hardening heat, actual temp can be set according to actual needs.Due to heating and quenching time, the body of roll and pressure
Plate and the expansion of suspension rod, shrinkage factor difference, be easily caused medium and enter, and deformation can be carried out by the elasticity of flatulence circle 5 self
Compensate, thus ensure whole during central hole be in sealing state.
4) it is heated to 860～980 DEG C, is incubated after within 3～5 hours, hanging out the body of roll 3 and carries out Quenching Treatment；
Concrete quenching mode can hardness according to actual needs be adjusted, and does not has concrete restriction.In order to reach relatively
Good hardness and toughness, can use the double mode of quenching of water, oil to carry out Quenching Treatment.Specifically, the body of roll 3 is put after heating furnace hangs out
Entering and cool down in water, surface temperature reduces, and slings after 2～5 minutes；Internal temperature outwards transmits, in atmosphere cooling 2～6 minutes
Place in cooling water, 3～5 times the most repeatedly；The body of roll 3 is outside obtains higher hardness, then the body of roll 3 is hung in fluid
Row cools down completely.
It should be noted that also can process, during water spray at the two ends of body of roll interval water spray after heating furnace hangs out at the body of roll 3
Between be 1～2 minute, temperature recover after again spray water, spray water 2～3 times, then carrying out subsequent treatment, i.e. the body of roll 3 is being put into cold
But, in water, surface temperature reduces, and slings after 2～5 minutes；During cooling places into cooling water for 2～6 minutes in atmosphere, the most instead
Put into after multiple 3～5 times in fluid and cool down.
After Quenching Treatment, the body of roll 3 firmness outside reaches up to HRC58～65, and middle part hardness is about HRC33～38,
At center bore inner wall, hardness is about HRC23～35, it can be seen that hardness ecto-entad is gradually lowered.Wherein shrend purpose mainly carries
High surface hardness, after oil quenching, body of roll inner hardness is also improved.Owing to centre bore is sealed, close to slow at kernel of section
Cold, it is possible to keep preferable toughness.
5) 2～3 temper are carried out after quenching.
Drawing process is: be tempered at 180～200 DEG C, is incubated 9～12 hours；Then carry out twice temperature 180～
190 DEG C, the insulation lonneal of 6～8 hours.
By temper, making internal stress be equalized, after temper, the body of roll 3 firmness outside reaches up to HRC56
～62, middle part tissue hardness is about HRC30～35, and at center bore inner wall, hardness is about HBC210～240.Although firmness change is not
Greatly, but preferably eliminate stress concentration phenomenon, it is to avoid the generation of crackle.In drawing process, body of roll inside is mainly made to answer
Power eliminates, and can misalign central hole and seal.
Embodiment 2
Control top board 4 in the present embodiment, semidiameter between lower platen 2 and suspension rod 9 is 1～5mm, contributes to high temperature cotton
Sealing fill, if excesssive gap, high temperature cotton be difficult to fill consolidation, sealing effectiveness is undesirable.The present embodiment is chosen radius
Difference is 2mm.The diameter of lower platen 2 and top board 4 is not less than 0.8 times of the body of roll 3 end face diameter, so as to the end face to the body of roll
Form protection.
Embodiment 3
In the present embodiment, the sidewall of clamp nut 7 offers bayonet socket 8, and this bayonet socket 8 is distributed along clamp nut 7 radial symmetric.
After heating the body of roll 3, workman cannot be close, therefore can block bayonet socket 8 by clamp, thus rotatably compress nut 7.Therefore,
In step a and step c of exhaust process, with clamp or other device card card inlets 8, thus can rotate and unclamp clamp nut
7.Other structures can also be set to assist the rotation of clamp nut 7, such as, protrude fixture block, draw-in groove etc., be not specifically limited.
Embodiment 4
Arranging pull bar on top board 4 in the present embodiment, as it is shown on figure 3, this pull bar is cylindrical bar, radial symmetric is arranged on
Top board 4 upper surface, is used for mentioning top board 4 aerofluxus.Step b can entangle cylindrical bar with steel pipe, then rotate.
Additionally, step 4) in when quenching, the body of roll 3 is put into after heating furnace hangs out cooling water, is hung after 2～5 minutes
Rise, during cooling places into cooling water for 2～6 minutes in atmosphere, 3～5 times the most repeatedly；Then the body of roll 3 is immersed in cooling water
Cool down.
When using unskilled labor to put into row Quenching Treatment, although inside is filled with solid filler, but is difficult to prevent quenching to be situated between
Matter is penetrated into from pressing plate or in screw thread, so many meetings touch hardening media at centre bore and end contact, and does not has
There is preferably temperature by protective measure, cause centre bore and end face junction Cooling Quenching, form stress and concentrate, when tempering the most very
Difficulty makes stress be eliminated, and the most just causes the body of roll to be easy in this place and cracks, the most directly ties cracking.
And the present invention utilizes quencher to put into row Quenching Treatment, on the one hand, use flatulence circle to coordinate high temperature cotton to seal,
The body of roll is compensated by thermal deformation, improves sealing effectiveness；On the other hand, technique carries out pump-down process, produce in centre bore
Raw negative pressure, carrys out auxiliary seal by external pressure, it is possible to prevent medium from entering, improves sealing effectiveness further, it is ensured that in the body of roll
Toughness at the heart, can effectively prevent stress from concentrating, it is to avoid smoothing roll ftractures.
Schematically being described the present invention and embodiment thereof above, this description does not has restricted, institute in accompanying drawing
Show is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel enlightened by it, in the case of without departing from the invention objective, designs and this technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (9)
1. a Heavy Straightening Roller processing method, it is characterised in that: use 9Cr2Mo material quenched place after forging processing, forging
Finished product is obtained after reason, preliminary working, finished heat treatment, polish；Wherein, quencher is utilized to put into row during finished heat treatment
Quenching protection, is first preheating to 580～650 DEG C, continues heating, finally quench after then putting into row pump-down process by quencher
Fire processes.
A kind of Heavy Straightening Roller processing method the most according to claim 1, it is characterised in that: forging adds the beginning forging temperature in man-hour
Degree is 1000～1080 DEG C, and final forging temperature is 800～860 DEG C；After being cooled to 720～760 DEG C after forging, oil is cooled to 180～220
DEG C, then proceed to 680～700 DEG C of tempering.
A kind of Heavy Straightening Roller processing method the most according to claim 1, it is characterised in that: its finished heat treatment concrete
Process is:
1) body of roll (3) after machining is inserted in the suspension rod (9) of quenching frock, top board (4) is set in the body of roll (3) upper end
With flatulence circle (5), and filled high-temperature cotton (6) between adjacent two parts, by clamp nut (7), the two ends of the body of roll (3) are sealed；
Suspension hook is installed in suspension rod (9) upper end, the body of roll (3) is hung in heating furnace；
2) it is warming up to 580～650 DEG C with stove, is incubated 1～3 hour；
3) body of roll (3) is hung out, unscrew clamp nut (7) and be exhausted, then tighten clamp nut (7), the body of roll (3) is hung in
Heating furnace continues heating；Its exhaust process is:
A, the body of roll (3) is hung out after, unscrew clamp nut (7)；
B, slowly rotating top board (4), centre bore inner high voltage gas is discharged；
C, again screw clamp nut (7), in then the body of roll (3) being hung in heating furnace, continue heating；
4) it is heated to 860～980 DEG C, is incubated 3～5 hours, then hang out the body of roll (3) and carry out Quenching Treatment；
5) step 4) quenching complete after carry out 2～3 temper.
A kind of Heavy Straightening Roller processing method the most according to claim 3, it is characterised in that: the suspension rod of described quenching frock
(9) lower end connects baffle plate (1), and suspension rod (9) is set with lower platen (2), and during use, the both sides of lower platen are all filled with high temperature
Cotton (6)；Suspension rod (9) middle and upper part is provided with external screw thread, top board (4) and flatulence circle (5) and is all sleeved on suspension rod (9), compresses spiral shell
Female (7) threaded with suspension rod (9), all fill in top board (4) and the both sides up and down of flatulence circle (5) and flatulence circle (5) inner chamber
High temperature is cotton (6).
A kind of Heavy Straightening Roller processing method the most according to claim 4, it is characterised in that: described clamp nut (7)
Sidewall offers bayonet socket (8), and this bayonet socket (8) is distributed along clamp nut (7) radial symmetric.
A kind of Heavy Straightening Roller processing method the most according to claim 4, it is characterised in that: described top board sets on (4)
It is equipped with pull bar or draw ring, is used for mentioning top board (4) aerofluxus.
A kind of Heavy Straightening Roller processing method the most according to claim 3, it is characterised in that: step 3) in exhaust process
Completed in 10 minutes.
A kind of Heavy Straightening Roller processing method the most according to claim 3, it is characterised in that: step 4) in Quenching Treatment
Process is: the body of roll (3) is put into cooling water after heating furnace hangs out, and slings after 2～5 minutes, in atmosphere cooling 2～6 minutes
Place in cooling water, 3～5 times the most repeatedly；Then the body of roll (3) is hung in fluid and cool down.
A kind of Heavy Straightening Roller processing method the most according to claim 3, it is characterised in that: step 4) in quench
Time, the body of roll (3) is put into after heating furnace hangs out cooling water, is sling after 2～5 minutes, cools down in atmosphere and puts for 2～6 minutes again
Enter and cool down in water, 3～5 times the most repeatedly；Then the body of roll (3) is immersed in cooling water and cool down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610796139.0A CN106282496B (en) | 2016-08-31 | 2016-08-31 | A kind of Heavy Straightening Roller processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114032367A (en) * | 2021-11-11 | 2022-02-11 | 中冶陕压重工设备有限公司 | Double-liquid quenching heat treatment method for CrWMn spinning core mold |
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| JP2003160853A (en) * | 2001-11-22 | 2003-06-06 | Cnk:Kk | Method for carburizing narrow or deep hole |
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| CN114032367A (en) * | 2021-11-11 | 2022-02-11 | 中冶陕压重工设备有限公司 | Double-liquid quenching heat treatment method for CrWMn spinning core mold |
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