CN107267734A - Gear chamber annealing process - Google Patents
Gear chamber annealing process Download PDFInfo
- Publication number
- CN107267734A CN107267734A CN201710611849.6A CN201710611849A CN107267734A CN 107267734 A CN107267734 A CN 107267734A CN 201710611849 A CN201710611849 A CN 201710611849A CN 107267734 A CN107267734 A CN 107267734A
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- Prior art keywords
- gear chamber
- furnace
- cooling
- annealing
- annealing process
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Classifications
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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
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of gear chamber annealing process, following processing step is specifically included：A, gear chamber is put into annealing furnace；B, with inert gas replacement furnace gas to furnace pressure be 5000~10000Pa malleations while, with 65~70 DEG C/h of firing rate by gear chamber be heated to 550 ± 25 DEG C and be incubated 4~5 hours；C, keep 5000~10000Pa of furnace pressure under conditions of, with 25~30 DEG C/h of cooling velocity furnace cooling to 350 DEG C~380 DEG C, then with 35~40 DEG C/h of speed furnace cooling to less than 200 DEG C then progress air cooling；D, finally gear chamber come out of the stove.This annealing process can improve the gear chamber surface quality after annealing, cancel the oxide layer prune job after annealing, improve product quality, reduce energy consumption and spillage of material and improve production efficiency.
Description
Technical field
The present invention relates to the Technology for Heating Processing of metal material, and in particular to handles gear chamber using bell type annealing furnace.
Background technology
Existing gear chamber annealing treating process includes vacuum annealing or inert free gas protection annealing.JP9-217157 is public
Open a kind of vacuum annealing process：To anneal stove evacuation first, be then heated to 400 DEG C with up to annealing temperature below, then
500~600 DEG C are heated in the case where being filled with high-purity nitrogen and is incubated.Under relative vacuum state, still suffered from stove
Evil atmosphere, nitrogen also has a negative impact to the gear chamber surface quality after annealing.Requirement of the vacuum annealing process to equipment is high,
Security is relatively low, is unsuitable for the annealing of heavy-weight coil gear chamber.Inert free gas protection annealing is carried out in open environment, after annealing
Gear chamber surface aerobicization layer, it is of poor quality, needed after annealing clear up oxide layer, both increase material consumption and workload, again drop
Low production efficiency.Accordingly, it is desirable to be improved above-mentioned existing gear chamber annealing process.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide a kind of gear chamber annealing process, improving annealing whereby
Gear chamber surface quality afterwards, cancels the oxide layer prune job after annealing, improves product quality, and reduction energy consumption and material are damaged
Consumption, improves production efficiency.
To realize the purpose, the present invention provides a kind of gear chamber annealing process, including：
A, gear chamber is put into annealing furnace；
B, while being 5000~10000Pa malleations with inert gas replacement furnace gas to furnace pressure, with 65~
Gear chamber is heated to 550 ± 25 DEG C and is incubated 4~5 hours by 70 DEG C/h of firing rate；
C, keep 5000~10000Pa of furnace pressure under conditions of, it is cold with stove with 25~30 DEG C/h of cooling velocity
But to 350 DEG C~380 DEG C, then with 35~40 DEG C/h of speed furnace cooling to less than 200 DEG C then carry out air cooling；
D, finally gear chamber come out of the stove.
Preferably, in above-mentioned gear chamber annealing process, before step B, first with nitrogen purge annealing furnace 15~
To replace furnace atmosphere, and/or in step C cooling procedure, purged with nitrogen in stove 15~30 minutes within 30 minutes.At this
In, the nitrogen purging in cooling procedure is preferably carried out when gear chamber reaches tapping temperature soon, and this is done to replace in stove
Atmosphere.First nitrogen is purged in heating process primarily to saving the consumption of inert gas.
Preferably, the present invention performs above-mentioned annealing process using bell type annealing furnace, it includes inner cover, the heating mantles of activity
With the cooling dome of activity, in step, gear chamber is hung into inner cover, in stepb, is first heated gear chamber with heating mantles
To 450 DEG C and 1~2 hour is incubated, is then continued gear chamber is heated into 550 DEG C and to be incubated with heating mantles, in step C cooling
During, band heating mantles cooling is first carried out in the case where heating covers in inner cover, then gear chamber is cooled to out with cooling dome
Furnace temperature.
Preferably, be in prescribed level for inert gas pressure in holding furnace, preferably step B heating and be incubated
All the time with 20~30m in journey3The flow of/hour is passed through inert gas such as argon gas into stove.So, although heating and being incubated
Furnace gas leakage is likely to occur in journey, but above-mentioned pressurize measure can ensure that furnace pressure meets prescribed level, be derived from good
Good gear chamber quality.
Preferably, in step C, to keep 5000~10000Pa of furnace pressure, with 1m3/ hour is to 20m3/ hour
Inert gas is passed through the inner cover of annealing furnace such as bell type annealing furnace by flow, thereby guarantees that furnace pressure meets prescribed level, enters
And obtain good gear chamber quality.
Preferably, according to the gear chamber annealing process of the present invention, first can be carried out in above-mentioned cooling procedure to gear chamber
Slow cooling, is then quickly cooled to tapping temperature by gear chamber, can so prevent the annealing of gear chamber from bonding.Slow cooling can use 25
DEG C/h cooling velocity and the cool time of 8 hours.When performing annealing process with above-mentioned bell type annealing furnace, above-mentioned cold
But during, band heating mantles cooling is first carried out in the case where heating mantles still covers in inner cover, it is then with cooling dome that gear chamber is cold
But to tapping temperature.The annealing process of the present invention can be implemented using other types of annealing furnace.
Preferably, being preferred for carrying out at annealing gear chamber with bell type annealing furnace according to the annealing process of the present invention
Reason.
Preferably, in stepb, inert gas is passed through into annealing furnace to be carried out with heat temperature raising, or can be first simultaneously
Inert gas is passed through, heat temperature raising is then carried out.Or, at the end of inert gas is passed through not yet, so that it may carry out heat temperature raising.
Preferably 25 DEG C/h of cooling velocity carries out 8 hours of slow cooling in step C, is then entered using 35 DEG C/h of cooling velocity
5 hours of row chilling.
Preferably, coming out of the stove to gear chamber from step B, preferably there is inert gas in annealing furnace all the time to protect gear
Room.Especially after inert gas replacement, furnace pressure can remain 10000Pa.Therefore, it is preferred that to coming out of the stove after gas displacement
Inert gas is filled into preceding each step.
Preferably, the gear chamber annealing process of the present invention is preferred to use bell type annealing furnace, it is characterized in including available liquid
Presser feet compress can opening type inner cover, the heating mantles of activity and activity cooling dome, heating mantles is equipped with burner, for according to by
The temperature that temperature sensor such as thermocouple in annealing furnace is determined implements annealing temperature control.Certainly, the present invention can also use it
The annealing furnace of its type.
Preferably, in the annealing process of said gear room, it is preferred to use purity is more than 95% to 99.999% argon gas
It is used as inert gas.If purity of argon be less than or equal to 95%, may because wherein doped with oxygen to the tooth after annealing
Engineer room surface quality has a negative impact.From economy, purity of argon is unsuitable too high, therefore selection 99.999% is as upper
Limit.It is preferred that purity is more than 99.9% argon gas.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the bell type annealing furnace of the gear chamber annealing process of the present invention；
Fig. 2 is the gear chamber annealing process curve schematic diagram of embodiments of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in figure 1, the present invention provides a kind of gear chamber annealing process, it can be implemented with bell type annealing furnace, the cover
Formula annealing furnace includes the cooling dome of openable inner cover 1, the heating mantles of activity and activity, and heating mantles is furnished with multiple burners, is used for
The gear chamber for being placed into inner cover according to being heated by the temperature that such as thermocouple is surveyed of the temperature sensor in annealing furnace (is not marked in figure
Show).
Shown in Figure 2, gear chamber annealing process of the invention includes：Gear chamber is put into annealing furnace；With inert gas 2
It is 50000Pa malleations to replace furnace atmosphere to furnace pressure, is heated to gear chamber with 65~70 DEG C/h of firing rate
550 ± 25 DEG C and be incubated 4~5 hours；Keep furnace pressure 50000Pa under conditions of, with 25~30 DEG C/h of speed with
Stove is cooled to 350 DEG C, then with 35~40 DEG C/h of speed furnace cooling to less than 200 DEG C air coolings；Finally gear chamber is gone out
Stove.It is favourable that inert gas pressure, which is in prescribed level, in holding furnace in above-mentioned heating and insulating process and cooling procedure
, the surface quality of annealing product can be improved whereby.
Embodiments of the invention are specifically described with reference to multiple embodiments of annealing process of the present invention.
Embodiment 1：
The embodiment 1 of gear chamber annealing process of the present invention includes：Gear chamber is cleaned with conventional chemical method
Surface, to be processed by shot blasting to its surface；Gear chamber Jing Guo polishing is put into annealing furnace；With in nitrogen purging stove 15
Minute, to replace furnace air；After nitrogen purging, furnace atmosphere is thoroughly replaced for 99.99% argon gas with purity, to stove internal pressure
Power is 5000Pa malleations, while displacement, and gear chamber is heated into 550 DEG C with 70 DEG C/h of firing rate and insulation 4 is small
When；Under conditions of furnace pressure 5000Pa is kept, then with 25 DEG C/h of speed furnace cooling to 350 DEG C, then with 35 DEG C/
Hour speed furnace cooling to less than 200 DEG C air coolings；At the end of cooling stage, purged with nitrogen in stove 15 minutes；By tooth
Engineer room is come out of the stove.
Gear chamber by annealing can be directly conveyed road manufacturing procedure backward, without further cleaning gear chamber table
Face.
Embodiment 2：
:The embodiment 2 of gear chamber annealing process of the present invention includes：Gear chamber is cleaned with conventional chemical method,
To be processed by shot blasting to its surface；Gear chamber Jing Guo polishing is put into annealing furnace；With 30 minutes in nitrogen purging stove,
To replace furnace atmosphere；After nitrogen purging, furnace atmosphere is thoroughly replaced with 99.999% argon gas, is to furnace pressure
10000Pa malleations, are heated to 525 DEG C by gear chamber with 65 DEG C/h of firing rate and are incubated 5 hours；In holding furnace internal pressure
Under conditions of power 10000Pa, then with 30 DEG C/h of speed furnace cooling to 380 DEG C, then with 35 DEG C/h of speed with stove
It is cooled to less than 200 DEG C and is carrying out air cooling；With 30m in above-mentioned heating and insulating process3/ h flow is passed through above-mentioned argon gas,
With 4m in cooling procedure3/ h flow carries out protection cooling with argon gas to gear chamber；At the end of cooling stage, blown with nitrogen
Sweep in stove 45 minutes；Gear chamber is come out of the stove.
It is shown in Figure 2, it is the annealing process curve of the embodiment of the present invention, the gear chamber by annealing can be direct
Rear road manufacturing procedure is sent to, without further cleaning gear chamber surface.
Embodiment 3：
The embodiment 3 of the gear chamber annealing process of the present invention includes：Gear chamber is put into annealing furnace；Purged and annealed with nitrogen
Furnace interior 20 minutes, to replace furnace air；After nitrogen purging, furnace atmosphere is thoroughly replaced with 99.99% argon gas, to stove
Pressure is 8000Pa malleations, while displacement, gear chamber is heated into 400 DEG C with 100 DEG C/h of firing rate and is incubated
2 hours, then it is heated to 575 DEG C with 68 DEG C/h of firing rate and is incubated 4 hours；Keeping furnace pressure 8000Pa's
Under the conditions of, then with 27 DEG C/h of speed furnace cooling to 360 DEG C, then with 40 DEG C/h of speed furnace cooling to 200 DEG C
Carrying out air cooling below；At the end of cooling stage, purged with nitrogen in stove 30 minutes；Gear chamber is come out of the stove.At annealing
The gear chamber of reason can then be directly conveyed road manufacturing procedure backward, without further cleaning gear chamber surface.
In the above-described embodiments, purged and consumed primarily to saving argon gas with nitrogen before heating, and cooling stage
End is purged with nitrogen primarily to replacing furnace atmosphere.
In the bell type annealing furnace for being heated and being incubated with heating mantles, the burner that can be set on thermocouple, heating mantles can
Annealing temperature is controlled according to the temperature thus measured.The present invention annealing process in, preferably above-mentioned heating, insulation and
It is 5000-10000Pa malleations that furnace pressure is remained in cooling procedure, is that this is as needed and actual in above steps
Situation give stove mend in filling with inert gas, be derived from more preferable gear chamber quality, inert gas fill into flow can optionally and
It is fixed.In using the annealing process cooled down with heating mantles, the selection of cooling velocity and time can regard batch, coiled sheet material,
Depending on the factor such as form and performance.
Compared with prior art, the present invention has following advantages and effect：Compared with inert free gas protection annealing, pass through
Malleation in holding furnace, while inert gas consumption is reduced, it is to avoid the external world caused by reasons such as sealing, leakage, breakages is empty
Gas enters in stove and makes the element reactions such as O, H, N in gear chamber and air, thus can make the gear chamber surface anaerobic after annealing
Change layer, next procedure can be sent directly into, not only eliminate the mechanical reconditioning of the pickling process after conventional annealing, oxide layer and thus carry
High workload efficiency, reduction production cost and energy consumption, environmental pollution is reduced, and fundamentally solve and exist in the prior art
, cause because of surface contamination layer product physicochemical property to be deteriorated, the problems such as hardness increase, plasticity and elasticity reduction, fragility increase.
The present invention also has the advantages that technique is simple, flow is short, easy to operate, control is easy.Compared with vacuum annealing, simplified operation
Flow, reduces equipment requirement, reduces operation difficulty, improves the security of production process, it is to avoid existing gear chamber annealing is existing
Adhesion problem, can make the gear chamber product physicochemical property after annealing meet product standard requirement.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (7)
1. a kind of gear chamber annealing process, including：
A, gear chamber is put into annealing furnace；
B, with inert gas replacement furnace gas to furnace pressure be 5000~10000Pa malleations while, with 65~70 DEG C/
Gear chamber is heated to 550 ± 25 DEG C and is incubated 4~5 hours by the firing rate of hour, then with 25~30 DEG C/h of cooling
Speed furnace cooling to less than 200 DEG C and then is carried out to 350 DEG C~380 DEG C, then with 35~40 DEG C/h of speed furnace cooling
Air cooling；
D, finally gear chamber come out of the stove.
2. gear chamber annealing process according to claim 1, it is characterised in that：Before step B, first moved back with nitrogen purging
Stove 15~30 minutes is to replace furnace atmosphere, and/or in step C cooling procedure, 15~30 points are purged in stove with nitrogen
Clock.
3. gear chamber annealing process according to claim 2, it is characterised in that：In step B heating process, first by tooth
Engineer room is heated to 350~450 DEG C and is incubated 1~2 hour, and gear chamber then is heated into 550 ± 25 DEG C and 4~5 hours are incubated.
4. gear chamber annealing process according to claim 2, it is characterised in that：In step C cooling procedure, first with
25 DEG C/h of cooling velocity passes through the cool time slow cooling gear chamber of 8 hours, and now inert gas is passed into annealing furnace, so
Gear chamber is cooled down to less than 200 DEG C with 35 DEG C/h of cooling velocity afterwards.
5. gear chamber annealing process according to claim 1, it is characterised in that：The annealing furnace is bell type annealing furnace, bag
The cooling dome of inner cover, the heating mantles of activity and activity is included, in step, gear chamber is hung into inner cover, in stepb, is first used
Gear chamber is heated to 450 DEG C and is incubated 1~2 hour by heating mantles, is then continued gear chamber being heated above 550 with heating mantles
DEG C and be incubated, in step C cooling procedure, in the case where heating mantles still covers in inner cover first carry out band heating mantles cooling, connect
With cooling dome and gear chamber is cooled to tapping temperature.
6. gear chamber annealing process according to claim 1, it is characterised in that：It is more than 95% to 99.999% using purity
Argon gas as inert gas, and in step B heating process, first gear chamber is warming up to 70 DEG C/h of speed
550 ± 25 DEG C and be incubated 4 hours.
7. gear chamber annealing process according to any one of claim 1 to 5, it is characterised in that：In step C, to protect
Furnace pressure 10000Pa is held, with 1m3/ hour is to 20m3Inert gas is passed through annealing furnace by the flow of/hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710611849.6A CN107267734A (en) | 2017-07-25 | 2017-07-25 | Gear chamber annealing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710611849.6A CN107267734A (en) | 2017-07-25 | 2017-07-25 | Gear chamber annealing process |
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| Publication Number | Publication Date |
|---|---|
| CN107267734A true CN107267734A (en) | 2017-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710611849.6A Pending CN107267734A (en) | 2017-07-25 | 2017-07-25 | Gear chamber annealing process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112481455A (en) * | 2020-11-26 | 2021-03-12 | 江苏联峰能源装备有限公司 | Non-quenched and tempered steel destressing annealing process for direct cutting |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101634008A (en) * | 2008-07-25 | 2010-01-27 | 武钢集团昆明钢铁股份有限公司 | Titanium coiled sheet controlled cooling and annealing process |
-
2017
- 2017-07-25 CN CN201710611849.6A patent/CN107267734A/en active Pending
Patent Citations (4)
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| CN101634008A (en) * | 2008-07-25 | 2010-01-27 | 武钢集团昆明钢铁股份有限公司 | Titanium coiled sheet controlled cooling and annealing process |
| CN101634006A (en) * | 2008-07-25 | 2010-01-27 | 武钢集团昆明钢铁股份有限公司 | Titanium plate coil blowing and annealing process |
| CN101634005A (en) * | 2008-07-25 | 2010-01-27 | 武钢集团昆明钢铁股份有限公司 | Titanium plate coil annealing process |
| CN101634007A (en) * | 2008-07-25 | 2010-01-27 | 武钢集团昆明钢铁股份有限公司 | Titanium plate coil pressure control annealing process |
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| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112481455A (en) * | 2020-11-26 | 2021-03-12 | 江苏联峰能源装备有限公司 | Non-quenched and tempered steel destressing annealing process for direct cutting |
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Application publication date: 20171020 |
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