CN101429587A - Isothermal normalizing treatment process by utilizing forging waste heat of forge piece - Google Patents
Isothermal normalizing treatment process by utilizing forging waste heat of forge piece Download PDFInfo
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- CN101429587A CN101429587A CNA200810195275XA CN200810195275A CN101429587A CN 101429587 A CN101429587 A CN 101429587A CN A200810195275X A CNA200810195275X A CN A200810195275XA CN 200810195275 A CN200810195275 A CN 200810195275A CN 101429587 A CN101429587 A CN 101429587A
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- temperature
- conveying belt
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- 238000005242 forging Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000002918 waste heat Substances 0.000 title claims abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- 230000003064 anti-oxidating effect Effects 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- 239000000446 fuel Substances 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000010301 surface-oxidation reaction Methods 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 208000034189 Sclerosis Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention discloses an isothermal normalizing treatment process by utilizing forging waste heat of a forging piece, which is carried out under the condition that the temperature of the forging piece waste heat is 950-1050 ℃ during finish forging. Sequentially conveying the forgings into a heating furnace by a conveying belt, wherein the temperature of the heating furnace is controlled to be 870-950 ℃; in the atmosphere that the heating furnace is filled with anti-oxidation gas, preserving the heat of the forge piece for 20-180 min; conveying the forgings to an air cooling chamber in sequence by a conveying belt, and cooling the forgings to 600-720 ℃ by nitrogen air; and sequentially feeding the forgings into an isothermal furnace filled with nitrogen through a conveying belt, keeping the temperature at 500-720 ℃, keeping the temperature for 45-180 min, and then discharging the forgings out of the furnace for natural cooling. The invention does not need secondary heating, and simultaneously protects the surface of the forging from generating an oxidation layer by assisting the anti-oxidation gas, thereby practically protecting the surface quality of the forging in the normalizing treatment stage. The invention is particularly suitable for precision hot die forging production.
Description
Technical field
The present invention relates to a kind of forging thermal treatment process, particularly a kind of thermal treatment process of utilizing the forging process for fuel waste heat to carry out isothermal normalizing.
Background technology
When freely cooling off, the hot-die forging of surface hardening steel easily forms cementation zone, the hardened layer on forging surface is unfavorable for follow-up machining, need before the machining to do necessary thermal treatment with remedy of casehardening layer, it is one of effective technique of remedy of casehardening layer that isothermal normalizing is handled, and prior art is concentrated forging to be placed to and carried out isothermal normalizing in the normalizing furnace and handle.This normalizing process is easy, the easily unified control of normalizing temperature, soaking time, and the normalizing steady quality can satisfy follow-up mach requirement.Weak point is to reheat together and be incubated behind the forging naturally cooling, and the forging second-heating had both increased the forging cost, also increases the surface oxidation of forging.For net-size forging, surface oxidation directly reduces the surface quality of forging.The isothermal normalizing technology of prior art is not suitable for the net-size forging production requirement.
Summary of the invention
The present invention is primarily aimed at the deficiencies in the prior art, proposes a kind of forging process for fuel waste heat that utilizes and carries out treatment process for isothermal normalizing, and this technical scheme is not made second-heating, not only save energy but also to net-size forging surface quality not damaged.
The present invention is achieved through the following technical solutions technical object.
Utilize the forging process for fuel waste heat to carry out isothermal normalizing technology, the forging waste heat supply temperature is 950～1050 ℃ during finish-forging, and its improvements are to make isothermal normalizing by following operation to handle:
(1) forging of finish-forging is sent into process furnace by the conveying belt order;
(2) be full of in the anti-oxidation atmosphere at process furnace, furnace temp is controlled at 870～950 ℃, and forging is incubated 20～180min in process furnace;
(3) the conveying belt order is delivered to air-cooling chamber with forging, the air-cooled forging to 600 of usefulness nitrogen～720 ℃;
(4) forging is sent into by the conveying belt order in the constant-temperature oven that is full of nitrogen, and furnace temperature is 500～720 ℃, the naturally cooling of coming out of the stove behind insulation 45～180min.
Behind the hot-die finish forge, utilize the waste heat of forging finish-forging to do the isothermal normalizing processing, do not need second-heating, be aided with anti-oxidation gas shield forging surface simultaneously and do not produce zone of oxidation, protect the surface quality of net-size forging conscientiously.The anti-oxidation gas that is full of in the process furnace is to produce gaseous methanol by being instilled into methyl alcohol.
The present invention compared with prior art has following positively effect:
1, utilizes the forging waste heat to make isothermal normalizing and handle, need not reheat, save the energy;
2, remove forging from and heat once more, reduce forging surface oxidation condition, help protecting forging surface quality;
3, chain type production process, production smoothing, constant product quality.
Description of drawings
Accompanying drawing is a technical process block diagram of the present invention.
Embodiment
According to process flow sheet also in conjunction with the embodiments, the invention will be further described below.
Embodiment 1:
Utilizing the forging process for fuel waste heat to carry out treatment process for isothermal normalizing, is the technology of then implementing normalizing treatment behind the forging finish-forging.The present embodiment forging is the car differential gear of accurate hot die forming, and flank of tooth precise form, gear material are 20CrMo, and the forging final forging temperature is 950～1050 ℃.The forging of finish-forging is sent into process furnace through the conveying belt order, in process furnace, be instilled into methyl alcohol, furnace temp is controlled at 940 ± 10 ℃, the methyl alcohol that is instilled under this temperature condition becomes gaseous methanol and is full of in the process furnace, then forging is sent into air-cooling chamber behind forging insulation 160 ± 20min by conveying belt, with the air-cooled forging to 610 of nitrogen ± 10 ℃, forging is sent in the constant-temperature oven that is full of nitrogen by conveying belt after air-cooled, forging is incubated 170 ± 10min under 610 ± 10 ℃ of furnace temperature, the naturally cooling of coming out of the stove then.The present invention makes full use of the forging process for fuel waste heat, and implements normalizing treatment under anti-oxidation gas shield, and forging need not reheat, and the surface is difficult for oxidation, sclerosis, guarantees the car differential gear tooth accuracy of accurate hot die forming.
Embodiment 2:
The present embodiment forging is a Car Change-speed Gear Box Binding Gear, and material is the same with embodiment 1, and only scantlings of the structure and volume are smaller relatively.The step of utilizing the forging process for fuel waste heat to carry out treatment process for isothermal normalizing is equal to embodiment 1, but part processing parameter value is different.For example; forging enters in 860 ± 10 ℃ of process furnace and under the methanol gas protection; insulation 30 ± 10min; then send into air-cooling chamber by conveying belt; with the air-cooled forging to 710 of nitrogen ± 10 ℃; forging is sent in the constant-temperature oven that is full of nitrogen by conveying belt after air-cooled, and forging is incubated 50 ± 5min under 710 ± 10 ℃ furnace temperature, the naturally cooling of coming out of the stove then.The present embodiment technique effect is identical with embodiment 1, can guarantee not damage in the normalizing treatment stage flank of tooth of accurate hot die forming Car Change-speed Gear Box Binding Gear wheel fully.
Claims (2)
1, a kind of forging process for fuel waste heat that utilizes carries out treatment process for isothermal normalizing, and the forging waste heat supply temperature is 950～1050 ℃ during finish-forging, it is characterized in that making isothermal normalizing by following operation handles:
(1) forging of finish-forging is sent into process furnace by the conveying belt order;
(2) be full of in the anti-oxidation atmosphere at process furnace, furnace temp is controlled at 870～950 ℃, and forging is incubated 20～180min in process furnace;
(3) the conveying belt order is delivered to air-cooling chamber with forging, the air-cooled forging to 600 of usefulness nitrogen～720 ℃;
(4) forging is sent into by the conveying belt order in the constant-temperature oven that is full of nitrogen, and furnace temperature is 500～720 ℃, the naturally cooling of coming out of the stove behind insulation 45～180min.
2, the forging process for fuel waste heat that utilizes according to claim 1 carries out treatment process for isothermal normalizing, it is characterized in that: the anti-oxidation gas that is full of in the described process furnace is to produce gaseous methanol by being instilled into methyl alcohol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810195275XA CN101429587A (en) | 2008-10-31 | 2008-10-31 | Isothermal normalizing treatment process by utilizing forging waste heat of forge piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810195275XA CN101429587A (en) | 2008-10-31 | 2008-10-31 | Isothermal normalizing treatment process by utilizing forging waste heat of forge piece |
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| CN101429587A true CN101429587A (en) | 2009-05-13 |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494106A (en) * | 2011-12-26 | 2012-06-13 | 重庆清平机械厂 | Process for manufacturing 20 CrMo carburizing steel gear |
| CN102517424A (en) * | 2011-12-19 | 2012-06-27 | 李明锁 | Thermal treatment process of hollow drill rod |
| CN102676752A (en) * | 2012-05-08 | 2012-09-19 | 无锡宏达热处理锻造有限公司 | Thermal treatment process for die steel H13 of automobile forged piece |
| CN102912092A (en) * | 2012-11-14 | 2013-02-06 | 洛阳Lyc轴承有限公司 | After-forging waste heat isothermal normalizing technology for 42CrMo steel extra large size bearing ring forge piece |
| CN103255275A (en) * | 2013-05-17 | 2013-08-21 | 江苏省宿迁市方圆机械有限公司 | Automobile torsion rod spring annealing process |
| CN103320584A (en) * | 2013-06-05 | 2013-09-25 | 衡阳市鹏润锻造有限公司 | Low-carbon alloy structural steel heat treatment method |
| CN104962705A (en) * | 2015-07-29 | 2015-10-07 | 山东伊莱特重工有限公司 | Isothermal normalizing treatment technique of wind power flange |
| CN105385816A (en) * | 2015-10-27 | 2016-03-09 | 浙江万向精工有限公司 | Forging waste heat normalizing process for hub bearing unit ferrule |
| CN105772623A (en) * | 2015-11-27 | 2016-07-20 | 昆山惠众机电有限公司 | Precise forging technology of T-shaped part |
| CN105886717A (en) * | 2016-04-30 | 2016-08-24 | 王中忞 | Normalizing method for forging waste heat of steel |
| CN106180502A (en) * | 2016-07-19 | 2016-12-07 | 苏州誉衡昌精密机械有限公司 | A kind of Forging Technology of precision component |
| CN106555033A (en) * | 2016-11-23 | 2017-04-05 | 扬州大学 | A kind of medium carbon steel residual forging heat isothermal normalizing processing method |
| CN106868279A (en) * | 2017-01-16 | 2017-06-20 | 扬州大学 | A kind of elimination 20CrMnTiH residual forging heats isothermal normalizing produces the Technology for Heating Processing of acicular ferrite |
| CN106929653A (en) * | 2017-03-01 | 2017-07-07 | 上海电气上重铸锻有限公司 | A kind of 25Cr2Ni2MoV rotor made of steel forging heat treatment method after forging |
| CN107617715A (en) * | 2016-07-15 | 2018-01-23 | 万向钱潮股份有限公司 | Close forging technology in automotive hub outer ring |
| CN107619912A (en) * | 2016-07-15 | 2018-01-23 | 万向钱潮股份有限公司 | Residual temperature normalizing process |
| CN108998643A (en) * | 2018-09-27 | 2018-12-14 | 东莞市国森科精密工业有限公司 | A method of improving flexbile gear raw material banded structure |
| CN111286588A (en) * | 2019-10-25 | 2020-06-16 | 南京工程学院 | Method for eliminating mixed crystal structure of 23CrNiMoV steel for large and medium-sized disc-shaped forgings |
-
2008
- 2008-10-31 CN CNA200810195275XA patent/CN101429587A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517424B (en) * | 2011-12-19 | 2017-08-25 | 山东凿岩钎具有限公司 | Thermal treatment process of hollow drill rod |
| CN102517424A (en) * | 2011-12-19 | 2012-06-27 | 李明锁 | Thermal treatment process of hollow drill rod |
| CN102494106A (en) * | 2011-12-26 | 2012-06-13 | 重庆清平机械厂 | Process for manufacturing 20 CrMo carburizing steel gear |
| CN102676752A (en) * | 2012-05-08 | 2012-09-19 | 无锡宏达热处理锻造有限公司 | Thermal treatment process for die steel H13 of automobile forged piece |
| CN102676752B (en) * | 2012-05-08 | 2014-01-29 | 无锡宏达热处理锻造有限公司 | Thermal treatment process for die steel H13 of automobile forged piece |
| CN102912092A (en) * | 2012-11-14 | 2013-02-06 | 洛阳Lyc轴承有限公司 | After-forging waste heat isothermal normalizing technology for 42CrMo steel extra large size bearing ring forge piece |
| CN103255275A (en) * | 2013-05-17 | 2013-08-21 | 江苏省宿迁市方圆机械有限公司 | Automobile torsion rod spring annealing process |
| CN103320584A (en) * | 2013-06-05 | 2013-09-25 | 衡阳市鹏润锻造有限公司 | Low-carbon alloy structural steel heat treatment method |
| CN103320584B (en) * | 2013-06-05 | 2016-06-08 | 衡阳市鹏润锻造有限公司 | The heat treating method of a kind of low-carbon alloy structural steel |
| CN104962705A (en) * | 2015-07-29 | 2015-10-07 | 山东伊莱特重工有限公司 | Isothermal normalizing treatment technique of wind power flange |
| CN105385816A (en) * | 2015-10-27 | 2016-03-09 | 浙江万向精工有限公司 | Forging waste heat normalizing process for hub bearing unit ferrule |
| CN105772623A (en) * | 2015-11-27 | 2016-07-20 | 昆山惠众机电有限公司 | Precise forging technology of T-shaped part |
| CN105886717A (en) * | 2016-04-30 | 2016-08-24 | 王中忞 | Normalizing method for forging waste heat of steel |
| CN107617715A (en) * | 2016-07-15 | 2018-01-23 | 万向钱潮股份有限公司 | Close forging technology in automotive hub outer ring |
| CN107619912A (en) * | 2016-07-15 | 2018-01-23 | 万向钱潮股份有限公司 | Residual temperature normalizing process |
| CN106180502A (en) * | 2016-07-19 | 2016-12-07 | 苏州誉衡昌精密机械有限公司 | A kind of Forging Technology of precision component |
| CN106555033A (en) * | 2016-11-23 | 2017-04-05 | 扬州大学 | A kind of medium carbon steel residual forging heat isothermal normalizing processing method |
| CN106868279A (en) * | 2017-01-16 | 2017-06-20 | 扬州大学 | A kind of elimination 20CrMnTiH residual forging heats isothermal normalizing produces the Technology for Heating Processing of acicular ferrite |
| CN106929653A (en) * | 2017-03-01 | 2017-07-07 | 上海电气上重铸锻有限公司 | A kind of 25Cr2Ni2MoV rotor made of steel forging heat treatment method after forging |
| CN108998643A (en) * | 2018-09-27 | 2018-12-14 | 东莞市国森科精密工业有限公司 | A method of improving flexbile gear raw material banded structure |
| CN111286588A (en) * | 2019-10-25 | 2020-06-16 | 南京工程学院 | Method for eliminating mixed crystal structure of 23CrNiMoV steel for large and medium-sized disc-shaped forgings |
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Open date: 20090513 |