CN107447090A - Nonuniform workpiece equilibrium heat-treating methods - Google Patents
Nonuniform workpiece equilibrium heat-treating methods Download PDFInfo
- Publication number
- CN107447090A CN107447090A CN201710647416.6A CN201710647416A CN107447090A CN 107447090 A CN107447090 A CN 107447090A CN 201710647416 A CN201710647416 A CN 201710647416A CN 107447090 A CN107447090 A CN 107447090A
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- China
- Prior art keywords
- workpiece
- heating
- cooling
- thick big
- heat
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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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
-
- 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
- C21D1/34—Methods of heating
Abstract
The invention discloses a kind of nonuniform workpiece equilibrium heat-treating methods, this method comprises the following steps：1) using the most thick big position for forcing heated partses in non-uniform wall thickness heat treatment of workpieces heating stepses, remaining position does not heat or kept outer surface adiabatic, forms heat transfer path of the thick big position to thin-walled position；2) workpiece after step 1) is heated carries out of short duration insulation in heat-treatment furnace, and soaking time is：0.2d hours, wherein d be workpiece most thick big wall thickness, unit mm；3) after incubation step, the thick big position of workpiece is subjected to pressure cooling first, remaining position does not force to cool down, and forms cooling duct of the thick big position to thin-walled position；Until making workpiece be cooled fast to design temperature.This method can be realized carries out balanced heating and cooling to workpiece in heat treatment process, reduce the temperature difference at workpiece thickness position, realize the tissue at workpiece thickness position and the uniformity of performance.
Description
Technical field
The invention belongs to technical field of heat treatment, more particularly to one kind realizes nonuniform workpiece equilibrium heat-treating methods.
Background technology
Heat treatment is to improve the important means and conventional means of workpiece performance.But often thickness is not in structure due to workpiece
One, the temperature difference at thick big position and thin-walled position is larger in heat treatment process, easily causes the heat treatment degree of workpiece different, tissue
It is uneven with performance, or even thick big position do not reach heat treatment requirements, be also easy to cause in addition inside workpiece produce big stress,
Deformation or even crackle.
The content of the invention
The defects of in order to overcome above-mentioned prior art, it is an object of the invention to provide the balanced heat treatment of nonuniform workpiece
Method, pressure heating is carried out to the big position (the residual riser pad of such as workpiece) of thickness of workpiece when being heat-treated heating, formed thick greatly
The heat transfer path at position to thin-walled position realizes the condition that workpiece uniformly heats；In heat-treatment quenching to the thick big position of workpiece
Pressure cooling is carried out, cooling duct of the thick big position to thin-walled position is formed, so as to realize that workpiece uniformly cools down.This method can be with
Reduce the temperature difference at workpiece thickness position in whole heat treatment process, improve workpiece everywhere speed and temperature is heated or cooled
Uniformity, help to realize the tissue at workpiece thickness position and the uniformity of performance, at the same reduce workpiece stress, deformation journey
Degree, reduce crackle tendency.
In order to achieve the above object, the technical proposal of the invention is realized in this way：The balanced heat treatment of nonuniform workpiece
Method, comprise the following steps：
1), in non-uniform wall thickness heat treatment of workpieces heating process, to the most thick big position of workpiece (such as casting workpiece it is residual
Stay riser pad) apply and force hot-fluid input to carry out pressure heating, remaining position does not heat or kept outer surface adiabatic, is formed thick big
Position is to the heat transfer path at thin-walled position, and heat passes to thin-walled position by being forced the most thick big position of heating, so as to realize
The heating at thin-walled position, the overall heating of workpiece is realized, workpiece is integrally warming up to the guarantor that Technology for Heating Processing provides to require
Temperature ± 25 DEG C, most thick big position and the most thin-walled position temperature difference≤50 DEG C.When workpiece thickness ratio (most thick big wall thickness/most thin-walled
It is thick) >=5 when, remaining portion faces of workpiece want covering insulation material to carry out thermal insulation.Force to measure the most thick big portion of workpiece during heating
Position and the temperature with the thin-walled position of its lie farthest away, heating power, work are forced by the overall temperature homogeneity regulation of workpiece
When part overall temperature difference is big, using big heating power, workpiece overall temperature difference hour, using small heating power.Forced in workpiece
Can be using outside sensing heating, resistance heating, infrared heating can also be used in heating the methods of.Batch (-type) can be used to force
Heat further to improve the temperature homogeneity of workpiece.The most thick big position of the non-uniform wall thickness workpiece be by thin-walled position every
The most thick big position opened, number >=1.
2) workpiece after heating, is subjected to of short duration guarantor under the holding temperature that Technology for Heating Processing requires in heat-treatment furnace
Temperature, soaking time are：0.2~1d hours, wherein d be workpiece most thick big wall thickness, unit mm.
3) after, insulation terminates, workpiece to be taken out, its thick big position is subjected to pressure cooling first, remaining position does not cool down,
As the most thick big position of workpiece first is immersed into cooling or water spray fog cooling or air blast cooling in liquid medium, thick big position is formed to thin
The cooling duct of wall site, heat is spread out of from thin-walled position by being forced the most thick big position of cooling, so as to realize thinner wall section
The cooling of position, the overall cooling of workpiece is realized, until making workpiece be cooled fast to design temperature.Measure the most thick big portion of workpiece simultaneously
The temperature and its cooling velocity of position and the thin-walled position of its lie farthest away, intensity of cooling is forced to realize that workpiece is integrally cold by adjusting
But speed meets normalizing or the requirement of tempering heat treatment, is such as adjusted into the depth of liquid cooling medium, selects different coolings
Medium, or using pressure water spray fog cooling or air blast cooling etc..Batch (-type) can be used to force cooling further to improve workpiece
Temperature homogeneity.
The present invention makes uneven wall thickness workpiece in the heating period is heat-treated mainly by the local heating at most thick big position
Mode substitutes the overall mode of heating of prior heat treatment, and the new paragon realizes that the most thick big position of workpiece is rapidly heated, by thick big
The heating at thin-walled position is realized at position to thin-walled position heat transfer, main in cooling stage so as to realize the balanced heating of workpiece
The overall type of cooling of prior heat treatment is substituted by the P-Coercive type of cooling at most thick big position, by thin-walled position to thickness
Big position heat transfer realizes the cooling of thin-walled, and so as to realize the quick cooling of the equilibrium of workpiece, the new paragon reduces heat treatment heating
With the temperature difference at the workpiece thickness position in two stages of cooling, the tissue at workpiece thickness position and the uniformity of performance are realized, simultaneously
Contribute to stress, the deformation extent of reduction workpiece, reduce crackle tendency.
Brief description of the drawings
Method schematic diagram when Fig. 1 is heat treatment of workpieces heating of the present invention
1- non-uniform wall thickness workpiece, the most thick big positions of 2-, the most thick big portion faces of 3- are forced to heat heat flow, and 4- is most thick big
Internal heat flows amount when portion faces are forced to heat
The method schematic diagram that it forces cooling when Fig. 2 is workpiece normalizing of the present invention or tempering cooling
The most thick big portion faces pressure heat flux amounts of 5-, internal heat flows amount when the most thick big portion faces of 6- are forced to cool down,
7- liquid medium grooves
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings.
Non-uniform wall thickness workpiece equilibrium heat-treating methods, comprise the following steps：
1), reference picture 1, when non-uniform wall thickness heat treatment of workpieces heats, pressure heat is applied to the big position 2 of thickness of workpiece 1
Stream input 3 carries out pressure heating (using high-frequency induction heating coil or resistance heating, infra red heating device), and remaining position is not added with
Heat keeps outer surface adiabatic, and inside workpiece is formed from thick to thin heat flow 4, so as to realize the heating at thin-walled position, is realized
The overall heating of workpiece, workpiece is finally set integrally to be warming up to holding temperature ± 25 DEG C that Technology for Heating Processing provides to require, it is most thick big
Position and most the thin-walled position temperature difference≤50 DEG C.When workpiece thickness ratio (most thick big wall thickness/most thin-walled thick) >=5, workpiece remaining
It is adiabatic that portion faces want covering insulation material to carry out.Force to measure the most thick big position of workpiece and thin with its lie farthest away during heating
The temperature of wall position, heating power is adjusted by the overall temperature homogeneity of workpiece, when workpiece overall temperature difference is big, added using big
Thermal power, workpiece overall temperature difference hour, using small heating power.
2) workpiece 1, is subjected to of short duration insulation under the holding temperature that Technology for Heating Processing requires in heat-treatment furnace, during insulation
Between be：0.2~1d hours, wherein d are most thick big wall thickness, unit mm.
3), reference picture 2, after insulation terminates, workpiece 1 is taken out, pressure cooling, surface is carried out first to its thick big position 2
Heat flux amount 5 of forcing is produced, inside workpiece forms the internal heat flows amount 6 from thin-walled to thick big position, such as first that workpiece is most thick
Cooled down in the liquid medium that big position is immersed in liquid medium groove 7.So as to realize the cooling at thin-walled position, workpiece entirety is realized
Cooling, until making workpiece be cooled fast to design temperature.The thin-walled position at the most thick big position of workpiece and its lie farthest away is measured simultaneously
The temperature and its cooling velocity put, intensity of cooling is forced to realize that workpiece entirety cooling velocity meets normalizing or tempering heat by adjusting
The requirement of processing, the depth of liquid cooling medium is such as adjusted into, selects different cooling mediums, or it is cold using pressure atomized water spray
But or air blast cooling etc..The present invention is applicable normalizing and tempering heat treatment of uniform wall thickness workpiece etc..
Technical scheme is described in detail the above.It is apparent that the present invention is not limited in described
Hold.Those skilled in the art can make a variety of changes accordingly, but it is any with it is of the invention be equal or similar change all
Belong to the scope of protection of the invention.
Claims (7)
1. a kind of non-uniform wall thickness workpiece equilibrium heat-treating methods, it is characterised in that comprise the following steps：
1) using the most thick big position for forcing heated partses in non-uniform wall thickness heat treatment of workpieces heating stepses, remaining position is not
Heating keeps outer surface adiabatic, forms thick big position to the heat transfer path at thin-walled position, heat is by being forced heating most
Thin-walled position is passed at thick big position, so as to realize the heating at thin-walled position, is realized the overall heating of workpiece, is finally made workpiece overall
It is warming up to holding temperature ± 25 DEG C that Technology for Heating Processing provides to require, most thick big position and the most thin-walled position temperature difference≤50 DEG C；
2) workpiece after step 1) is heated carries out of short duration guarantor under the holding temperature that Technology for Heating Processing requires in heat-treatment furnace
Temperature, soaking time are：0.2~1d hours, wherein d be workpiece most thick big wall thickness, unit mm；
3) after incubation step, the thick big position of workpiece is subjected to pressure cooling first, remaining position does not force to cool down, and forms thick big portion
Position is to the cooling duct at thin-walled position, and heat is spread out of from thin-walled position by being forced the most thick big position of cooling, so as to realize
The cooling at thin-walled position, the overall cooling of workpiece is realized, until making workpiece be cooled fast to design temperature.
2. method according to claim 1, it is characterised in that the most thick big position of non-uniform wall thickness workpiece described in step 1)
For the most thick big position separated by thin-walled position, number >=1.
3. method according to claim 1, it is characterised in that in step 1) when the workpiece thickness ratio >=5, in workpiece
Non-heated position covering insulation material carries out adiabatic.
4. method according to claim 1, it is characterised in that the step 1) heating uses sensing heating, resistance heating or
Infrared heating method.
5. method according to claim 1, it is characterised in that it is to quench to cool down in liquid medium that step 3) is described, which to force cooling,
Or water spray fog cooling or air blast cooling, so that the cooling of whole workpiece meets the requirement of normalizing or tempering.
6. method according to claim 1, it is characterised in that use thermoelectricity during the balanced heat treatment of nonuniform workpiece
Even monitoring workpiece surface temperature, so as to rate-determining steps 1) heating intensity and step 3) intensity of cooling.
7. method according to claim 1, it is characterised in that during the balanced heat treatment of nonuniform workpiece, step 1)
Batch (-type) is used to force heating and batch (-type) to force cooling further to improve the temperature homogeneity of workpiece with step 3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710647416.6A CN107447090A (en) | 2017-08-01 | 2017-08-01 | Nonuniform workpiece equilibrium heat-treating methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710647416.6A CN107447090A (en) | 2017-08-01 | 2017-08-01 | Nonuniform workpiece equilibrium heat-treating methods |
Publications (1)
| Publication Number | Publication Date |
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| CN107447090A true CN107447090A (en) | 2017-12-08 |
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| CN201710647416.6A Pending CN107447090A (en) | 2017-08-01 | 2017-08-01 | Nonuniform workpiece equilibrium heat-treating methods |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220573A (en) * | 2018-03-27 | 2018-06-29 | 清华大学 | Pipeline-like large-scale workpiece heat treatment method |
| CN112553413A (en) * | 2020-11-20 | 2021-03-26 | 二重（德阳）重型装备有限公司 | Planet carrier, casting material and heat treatment process thereof |
| CN113106217A (en) * | 2021-03-25 | 2021-07-13 | 广州市型腔模具制造有限公司 | Cold machining process for nozzle point |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6462414A (en) * | 1987-08-31 | 1989-03-08 | Nippon Kokan Kk | Production of high-tensile unequal-sided unequal thickness steel shape |
| JPH1192831A (en) * | 1997-09-12 | 1999-04-06 | Hitachi Cable Ltd | Annealing of deformed cross sectional plate and annealing apparatus therefor |
| JPH11182203A (en) * | 1997-12-19 | 1999-07-06 | Fuji Electric Co Ltd | Thermal refining of steam turbine rotor material and inspecting method therefor |
| CN201770740U (en) * | 2010-08-10 | 2011-03-23 | 山东金马工业集团股份有限公司 | Isothermal normal fire copying local thermal equilibrium device |
| CN105821199A (en) * | 2007-07-19 | 2016-08-03 | 塔塔钢铁艾默伊登有限责任公司 | Method for annealing a strip of steel having a variable thickness in length direction |
-
2017
- 2017-08-01 CN CN201710647416.6A patent/CN107447090A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6462414A (en) * | 1987-08-31 | 1989-03-08 | Nippon Kokan Kk | Production of high-tensile unequal-sided unequal thickness steel shape |
| JPH1192831A (en) * | 1997-09-12 | 1999-04-06 | Hitachi Cable Ltd | Annealing of deformed cross sectional plate and annealing apparatus therefor |
| JPH11182203A (en) * | 1997-12-19 | 1999-07-06 | Fuji Electric Co Ltd | Thermal refining of steam turbine rotor material and inspecting method therefor |
| CN105821199A (en) * | 2007-07-19 | 2016-08-03 | 塔塔钢铁艾默伊登有限责任公司 | Method for annealing a strip of steel having a variable thickness in length direction |
| CN201770740U (en) * | 2010-08-10 | 2011-03-23 | 山东金马工业集团股份有限公司 | Isothermal normal fire copying local thermal equilibrium device |
Non-Patent Citations (1)
| Title |
|---|
| JINWU KANG等: "Intensive riser cooling of castings after solidification", 《JOURNAL OF MATERIALS PROCESSING TECHNOLOGY》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220573A (en) * | 2018-03-27 | 2018-06-29 | 清华大学 | Pipeline-like large-scale workpiece heat treatment method |
| CN112553413A (en) * | 2020-11-20 | 2021-03-26 | 二重（德阳）重型装备有限公司 | Planet carrier, casting material and heat treatment process thereof |
| CN112553413B (en) * | 2020-11-20 | 2022-04-22 | 二重（德阳）重型装备有限公司 | Planet carrier, casting material and heat treatment process thereof |
| CN113106217A (en) * | 2021-03-25 | 2021-07-13 | 广州市型腔模具制造有限公司 | Cold machining process for nozzle point |
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Application publication date: 20171208 |