CN106119510A - A kind of smoothing roll quenching process - Google Patents
A kind of smoothing roll quenching process Download PDFInfo
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- CN106119510A CN106119510A CN201610796164.9A CN201610796164A CN106119510A CN 106119510 A CN106119510 A CN 106119510A CN 201610796164 A CN201610796164 A CN 201610796164A CN 106119510 A CN106119510 A CN 106119510A
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- Prior art keywords
- roll
- quenching
- suspension rod
- quenching process
- 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
- 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
Abstract
The invention discloses a kind of smoothing roll quenching process, belong to smoothing roll manufacture field.The smoothing roll quenching process of the present invention, uses Quenching Treatment frock to seal centre bore and the end face of the body of roll, and arranges flatulence circle between top board and clamp nut, thus forms effective sealing；When carrying out Quenching Treatment, first the body of roll is preheated, then the high-temperature gas in centre bore is discharged, the body of roll is heated；First use hoisting type shrend repeatedly during quenching, then immerse cooling in fluid, finally carry out temper.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, effectively avoids the generation of crackle.
Description
Technical field
The present invention relates to smoothing roll processing technique field, more particularly, it relates to a kind of smoothing roll quenching process.
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 aligning
For roller, it is relatively large in diameter, and outer surface requires have higher hardness, heart portion to need to keep preferable toughness, therefore, how to carry out
The heat treatment of smoothing roll, becomes 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, some materials are easy to make the body of roll open
Split.But no matter use which kind of integral quenching mode at present, all there is end face or the problem of overall cracking, particularly on grinding rank
Section, can there is annular crack in surface, this crackle is also difficult to eliminate by grinding, can only carry out surface reconditioning.And for cracking relatively
For serious 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 9Cr2Mo 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 smoothing roll quenching process, 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 smoothing roll quenching process of the present invention, its process technique is:
1) body of roll is inserted in suspension rod, top board and flatulence circle is set in body of roll upper end, and between adjacent two parts, fills height
Wen Mian, is sealed the two ends of the body of roll by clamp nut；Suspension hook is installed in suspension rod upper end, the body of roll is put into heating furnace；
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
Continue and be heated to 860～900 DEG C, be incubated 3～5 hours；
4) Quenching Treatment is carried out after hanging out the body of roll；
5) temper is carried out after quenching.
As further improvement of the present invention, step 3) in exhaust process completed in 10 minutes.
As further improvement of the present invention, step 4) in when quenching, the body of roll is put into cold after heating furnace hangs out
But, in water, sling after 2～5 minutes, 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 fluid and cools down completely.
As further improvement of the present invention, step 4) in when quenching, the body of roll is put into cold after heating furnace hangs out
But, in water, sling after 2～5 minutes, 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 and cools down completely.
As further improvement of the present invention, step 1) described downrod lower end connect have baffle plate, suspension rod is set with down
Pressing plate, 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
All being sleeved on suspension rod, clamp nut is threadeded with suspension rod, at top board and the both sides up and down of flatulence circle and flatulence circle inner chamber
All filled high-temperatures are cotton.
As further improvement of the present invention, the diameter of described lower platen and top board is not less than end surface of roll diameter
0.8 times.
As further improvement of the present invention, the sidewall of described clamp nut offers bayonet socket, and this card opening's edge compresses spiral shell
Female radial symmetric distribution.
As further improvement of the present invention, described top board is provided with pull bar or draw ring, is used for mentioning top board
Aerofluxus.
As further improvement of the present invention, described suspension rod upper end is provided with female thread, for connecting shackle.
3. beneficial effect
The technical scheme using the present invention to provide, compared with prior art, has the advantages that
(1) a kind of smoothing roll quenching process of the present invention, utilizes top board and flatulence circle to coordinate suspension rod to seal,
Pressing plate is prevented from hardening media and enters in end surface of roll and centre bore, thus avoids the hardenability within the body of roll；Carry out
During heating, first preheat, heat again after aerofluxus, it is possible to improve sealing further；Because gas in body of roll centre bore
After being heated air pressure increase, seal after aerofluxus, then when quenching, centre bore is internally formed negative pressure, make top board and
Lower platen 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；
(2) a kind of smoothing roll quenching process of the present invention, is had preferably by filled high-temperature cotton in flatulence circle
Sealing effectiveness, because mostly conventional seals is directly to tighten with bolt on pressing plate, and screw thread itself does not have sealing, quenching
Gap between medium is easy to by screw thread enters into centre bore, and adds flatulence circle and high temperature cotton in the present invention, and high temperature is cotton
Thread gaps can be filled up, so that hardening media cannot penetrate into, it is ensured that there is preferable quenching effect；
(3) a kind of smoothing roll quenching process of the present invention, first puts into the body of roll in cooling water again when quenching
Mention, through repeatedly repeatable operation, make body surface hardness improve, then carry out oil cold, decrease the quenching distortion of the body of roll,
Effectively prevent body of roll cracking, it is ensured that there is preferable toughness body of roll center.
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.
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
In conjunction with Fig. 1, Fig. 2, a kind of smoothing roll quenching process of the present embodiment, quencher is utilized to put at capable quenching
Reason, as shown in Figure 2, quenching frock includes suspension rod 9, lower platen 2, top board 4 and flatulence circle 5, and suspension rod 9 lower end connects baffle plate
1, suspension rod 9 is set with lower platen 2, during use, the both sides of lower platen are all filled with high temperature cotton 6, are used for sealing.On in suspension rod 9
Portion 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 sleeved on suspension rod 9, and under being positioned at
Between pressing plate 2 and top board 4, clamp nut 7 is threadeded with suspension rod 9, is pressed by 7 flatulence circles 5 of clamp nut and top board 4
Tight in the body of roll 3 upper surface, thus form sealing, end face and the centre bore of the body of roll 3 are the most capped, it is ensured that the end face of smoothing roll and in
Central hole will not be cooled quenching.In order to improve sealing property, at top board 4 and the both sides up and down of flatulence circle 5 and flatulence circle 5 inner chamber
All filled high-temperature cottons 6, i.e. between the body of roll 3 upper surface and top board 4, between top board 4 and flatulence circle 5, flatulence circle 5 with compress
Equal filled high-temperature cotton 6 between 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.
Further, the present embodiment controls top board 4, semidiameter between lower platen 2 and suspension rod 9 is 1～5mm, have
Helping the cotton sealing of high temperature fill, if excesssive gap, high temperature cotton is difficult to fill consolidation, and sealing effectiveness is undesirable.The present embodiment
In to choose semidiameter be 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 right
The end face of the body of roll forms protection.
Further, suspension rod 9 upper end is provided with female thread, for connecting shackle.If suspension hook and suspension rod are set to one
Body structure, then the body of roll 3 can only be set with from suspension rod 9 lower end, be unfavorable for that subsequent exhaust operates.
Further, 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.Additionally, also
Pull bar or draw ring can be set on top board 4, be used for mentioning top board 4 aerofluxus.
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 to be heated to 860～900 DEG C, is incubated 3～5 hours；
The operation of its exhaust process is as follows:
A, the body of roll 3 is hung out after, with clamp or other device card card inlets 8, unscrew clamp nut 7；
B, entangling pull bar with steel pipe, slowly rotate 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.
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) Quenching Treatment is carried out after hanging out the body of roll 3；
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.
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) temper is carried out after quenching.
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, after modulation, hardness is about HBC210～240.Although hardness
Change is little, but preferably eliminates stress concentration phenomenon, it is to avoid the generation of crackle.In drawing process, mainly make the body of roll
Internal stress eliminates, and can misalign central hole and seal.In order to fully eliminate internal stress, can carry out at 3～5 tempering
Reason.
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 smoothing roll quenching process, it is characterised in that: its process technique is:
1) body of roll (3) is inserted in suspension rod (9), top board (4) and flatulence circle (5) are set in the body of roll (3) upper end, and at adjacent two
Between part, filled high-temperature is cotton (6), by clamp nut (7), the two ends of the body of roll (3) is sealed；Suspension hook is installed in suspension rod (9) upper end,
The body of roll (3) puts into 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 to be heated to 860～900 DEG C, is incubated 3～5 hours；
4) Quenching Treatment is carried out after hanging out the body of roll (3)；
5) temper is carried out after quenching.
A kind of smoothing roll quenching process the most according to claim 1, it is characterised in that: step 3) in exhaust process
Completed in 10 minutes.
A kind of smoothing roll quenching process the most according to claim 1, 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 hung in fluid and cool down.
A kind of smoothing roll quenching process the most according to claim 1, 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.
5. according to a kind of smoothing roll quenching process according to any one of Claims 1 to 4, it is characterised in that: step 1)
Described 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 out
It is 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)
On, clamp nut (7) is threadeded with suspension rod (9), in top board (4) and the both sides up and down of flatulence circle (5) and flatulence circle (5)
The equal filled high-temperature in chamber is cotton (6).
A kind of smoothing roll quenching process the most according to claim 5, it is characterised in that: described lower platen (2) and upper
The diameter of pressing plate (4) is not less than 0.8 times of the body of roll (3) end face diameter.
A kind of smoothing roll quenching process the most according to claim 5, 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 smoothing roll quenching process the most according to claim 5, 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 smoothing roll quenching process the most according to claim 5, it is characterised in that: described suspension rod (9) upper end sets
It is equipped with female thread, for connecting shackle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610796164.9A CN106119510B (en) | 2016-08-31 | 2016-08-31 | A kind of smoothing roll quenching process |
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|---|---|---|---|
| CN201610796164.9A CN106119510B (en) | 2016-08-31 | 2016-08-31 | A kind of smoothing roll quenching process |
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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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| CN101134996A (en) * | 2006-08-29 | 2008-03-05 | 中信重型机械公司 | Double quenching technique for 9Cr2Mo leveler roll |
| CN204114457U (en) * | 2014-09-17 | 2015-01-21 | 中航通飞华南飞机工业有限公司 | A kind of universal conduit seal plug |
| CN204138715U (en) * | 2014-09-10 | 2015-02-04 | 上海中船三井造船柴油机有限公司 | For the heat treated endoporus seal protecting device of piston rod |
| CN104451099A (en) * | 2014-11-25 | 2015-03-25 | 江苏常宝普莱森钢管有限公司 | Thermal treatment protection device for eliminating oxidation of inner surface of steel pipe and using method of thermal treatment protection device |
| CN205298942U (en) * | 2016-01-26 | 2016-06-08 | 兖矿鲁南化肥厂 | Combined casing cap |
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2016
- 2016-08-31 CN CN201610796164.9A patent/CN106119510B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003160853A (en) * | 2001-11-22 | 2003-06-06 | Cnk:Kk | Method for carburizing narrow or deep hole |
| CN2636055Y (en) * | 2003-07-11 | 2004-08-25 | 武春海 | Multi-function pipe seal plug |
| CN101134996A (en) * | 2006-08-29 | 2008-03-05 | 中信重型机械公司 | Double quenching technique for 9Cr2Mo leveler roll |
| CN204138715U (en) * | 2014-09-10 | 2015-02-04 | 上海中船三井造船柴油机有限公司 | For the heat treated endoporus seal protecting device of piston rod |
| CN204114457U (en) * | 2014-09-17 | 2015-01-21 | 中航通飞华南飞机工业有限公司 | A kind of universal conduit seal plug |
| CN104451099A (en) * | 2014-11-25 | 2015-03-25 | 江苏常宝普莱森钢管有限公司 | Thermal treatment protection device for eliminating oxidation of inner surface of steel pipe and using method of thermal treatment protection device |
| CN205298942U (en) * | 2016-01-26 | 2016-06-08 | 兖矿鲁南化肥厂 | Combined casing cap |
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| CN106119510B (en) | 2017-10-13 |
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