CN201648470U - Gear ring nitrogen-protecting continuous normalizing furnace - Google Patents
Gear ring nitrogen-protecting continuous normalizing furnace Download PDFInfo
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- CN201648470U CN201648470U CN2010201448883U CN201020144888U CN201648470U CN 201648470 U CN201648470 U CN 201648470U CN 2010201448883 U CN2010201448883 U CN 2010201448883U CN 201020144888 U CN201020144888 U CN 201020144888U CN 201648470 U CN201648470 U CN 201648470U
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Abstract
The utility model relates to the field of heat treatment equipment, in particular to a normalizing device used for a gear ring. The utility model provides a gear ring nitrogen-protecting continuous normalizing furnace, aiming at overcoming the defect that rejects are easily produced in the normalizing heat treatment process of the existing normalizing furnace for the gear ring. The gear ring nitrogen-protecting continuous normalizing furnace comprises a hearth, a conveyer belt and a discharging part, wherein the conveyer belt passes through the interior of the hearth; the hearth is internally and sequentially provided with a heating area, a heat preservation area and a nitrogen cooling area along the direction from an inlet to an outlet; the heating area and the heat preservation area are connected with a heating and heat preservation system; the inlet of the hearth is communicated with the heating area, and the outlet thereof is communicated with the nitrogen cooling area; the normalizing furnace also comprises a nitrogen station which is respectively connected with the heating area, the heat preservation area and the nitrogen cooling area by conveying pipelines; the inlet of the hearth is provided with a nitrogen inlet hole, and the outlet thereof is provided with two nitrogen inlet holes; and the outer side of the inlet of the hearth is provided with an inlet sealing area which takes on an inclined shape. The normalizing furnace can prevent a gear blank from having oxidation decarburization phenomenon in the normalizing process, ensures the surface of the gear blank not to have oxide skin, improves the normalizing quality as well as the quality and the performance of the gear ring, simplifies the structure of the normalizing furnace, and simultaneously realizes continuous production, thus achieving the aims of energy conservation and emission reduction.
Description
Technical field
The utility model relates to the Equipment for Heating Processing field, especially a kind of normalizing equipment that is used for gear ring.
Background technology
According to the definition of GB7232 and GB/T16923, the normalizing of steel normally is heated to critical temperature Ac3 to steel or more than the Accm line, insulation for some time, carries out air cooling then.Because speed of cooling is very fast, compares with annealed structure, the either pearlite occurred in the tissue is more relatively, and lamella is finer and closely woven, so performance makes moderate progress, crystal grain thinning improves tissue, and eliminated unrelieved stress.Concerning soft steel, improve hardness after the normalizing and can improve machinability, improve piece surface smooth finish; For high carbon steel, normalizing then can be eliminated cementite network, prepares for next step Spheroidizing Annealing and quenching perform tissue.
Gear ring belongs to medium carbon steel with structural carbon steel (as S45C, S48C); some unstable tissue and internal stresss can appear in the process of rolling, crooked and welding; the main purpose of normalizing is in order to make interior tissue normalizing; hardness normalizing and elimination internal stress; for the high-frequency quenching in the subsequent handling and tempering ready; improve machinability simultaneously, and improve comprehensive mechanical performance.
Normalizing thermal treatment mainly comprises common normalizing; two sections normalizings and three kinds of modes of isothermal normalizing; what the gear manufacturing generally adopted at present is isothermal normalizing; normalizing equipment mostly is discontinuous formula normalizing furnace greatly; though can effectively improve the interior tissue of material; but in the actual production; workpiece surface can produce the oxidation and decarbonization phenomenon; in order to remove the oxide skin on tooth base surface; after normalizing, must carry out shot peening to the gear ring surface; both increase production cost, prolonged the production cycle again, and contaminate environment; the tooth base produces oxidation and decarbonization in the normalizing process major cause be because; in the heating and insulating process of common isothermal normalizing stove, the tooth base is exposed in the air all the time, because the temperature height; time is long; tooth base surface is not having to have quickened oxidising process under the situation of sfgd..
One adopts simple air cooling way cooling present in addition normalizing furnace, for medium carbon steel, because the temperature lowering speed is slower, be unfavorable for the refinement and the improvement of material inside organization, occur unstable tissue easily, influence follow-up production process, produce defective products.
The utility model content
In order to overcome existing normalizing furnace carries out occurring easily in the normalizing heat treatment process defective products to gear ring defective; a kind of gear ring nitrogen protection continuous type normalizing stove has been proposed; this normalizing furnace can prevent that the tooth base from the oxidation and decarbonization phenomenon taking place in the normalizing process; guarantee tooth base surface non-scale, improve the quality and the performance of normalizing quality and gear ring.
The utility model is to adopt following technical scheme to realize: a kind of gear ring nitrogen protection continuous type normalizing stove; comprise burner hearth; conveying belt and discharging portion; conveying belt runs through burner hearth inside; be provided with the heating zone successively along entering the mouth to Way out in the burner hearth; heat preservation zone and nitrogen cooling zone; the heating zone is connected with the heat tracing system with heat preservation zone; the inlet of burner hearth is communicated with the heating zone; the outlet of burner hearth is communicated with the nitrogen cooling zone; wherein; described normalizing furnace also comprises the nitrogen station; the nitrogen station by transport pipe respectively with the heating zone; heat preservation zone is connected with the nitrogen cooling zone; the ingress of burner hearth is provided with a nitrogen inlet mouth; the exit of burner hearth is provided with two nitrogen inlet mouths, and the outside of burner hearth ingress is provided with the inlet seal district, and the inlet seal district is skewed.
In the utility model, described conveying belt is connected with motor, and wherein conveying belt can adopt mesh-belt conveying portion; Motor can be frequency control motor, and frequency control motor can be realized stepless speed regulation.Described heat tracing system comprises electric heating tube and thermopair, has realized heating and insulation by electric heating tube, and thermopair is used to monitor temperature in the stove, thus the degree of heat of control electric heating tube.
Flame-proof sealing material is adopted in described burner hearth entry and exit, has limited the gas in the burner hearth and the circulation of outside air.In addition, the length by lengthening inlet seal district, to reduce entrance section long-pending and adopt the tilting structure, can suppress entering of outside air and overflowing of inner nitrogen effectively.
Described nitrogen gas delivery-line is provided with glass rotameter, is used for monitoring at any time the flow of nitrogen.
The outside of described furnace outlet is provided with discharging portion, and the below of discharging portion is provided with blower fan.When high temperature tooth base is transferred into the nitrogen cooling zone and carries out preliminary cooling fast along with conveying belt after, be transferred band and continue to transmit until discharging, and drop in discharging portion and the follow-up tote cart from furnace outlet, utilize blower fan that workpiece is continued to be cooled to normal temperature.
The beneficial effects of the utility model are: because the heating of workpiece, insulation and quick cooling all are to carry out in nitrogen protection atmosphere, therefore suppressed the oxidation and decarbonization phenomenon that the tooth base takes place effectively in the normalizing process, guarantee tooth base surface non-scale, improved the normalizing quality, improve the gear ring technological process of production, effectively improved the quality and the performance of product; Secondly, adopt high pressure low temperature nitrogen to cool off fast in the normalizing process, help the refinement of material inside organization and perfect, obtain favorable manufacturability and mechanical performance index; In addition, compare with common normalizing furnace, it has saved exhaust dust-removal system and feeding unit, has simplified the normalizing furnace structure, has realized continuous production simultaneously, has reached the purpose of energy-saving and emission-reduction.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
As shown in Figure 1, this normalizing furnace comprises conveying belt 1, burner hearth and discharging portion 5, is provided with heating zone, heat preservation zone and nitrogen cooling zone 4 in the burner hearth, and wherein the heating zone is connected with heat tracing system 3 with heat preservation zone.The inlet of burner hearth is communicated with the heating zone, and the outlet of burner hearth is communicated with nitrogen cooling zone 4.The outside of burner hearth inlet is provided with inlet seal portion 2, is connected by inlet between inlet seal portion 2 and the heating zone.This normalizing furnace comprises nitrogen station 7, and nitrogen station 7 is communicated with heating zone, heat preservation zone and nitrogen cooling zone 4 by nitrogen gas delivery-line, and nitrogen gas delivery-line is provided with glass rotameter, monitors the flow of nitrogen at any time, reaches the purpose of controllable adjustment.The narrower place of the inlet of burner hearth is provided with a nitrogen inlet mouth.The furnace outlet place and need cool off workpiece fast and effectively because the fire door open area is bigger, so the furnace outlet place is provided with two nitrogen inlet mouths, with the purity that guarantees furnace gas and the cooling quality of workpiece.In sum, normalizing heat treatment process is all carried out in nitrogen protection atmosphere.
Mesh-belt conveying portion adopts frequency control motor to drive, and can realize stepless change.The heat tracing system adopts electric heater for heating, by temperature in the thermopair monitoring stove, adopts the high-temperature flame-proof sealing material in the stove, stops scattering and disappearing of heat and overflowing of nitrogen effectively, has guaranteed that workpiece is not oxidized, and the steady transformation of workpiece interior tissue.
For reducing the consumption of nitrogen, flame-proof sealing material is adopted in the outlet of burner hearth and ingress, limited the circulation of interior gas of burner hearth and outside air, in addition the length by lengthening inlet seal portion 2, reduce the import sectional area, and inlet seal portion 2 is designed to tilting, can reach and suppress outside air effectively and enter the purpose that burner hearth and the inner nitrogen of burner hearth overflow.
The working process of utilizing above-mentioned normalizing furnace to carry out normalizing treatment is: at first, 3 pairs of heating zone of heat tracing system and heat preservation zone are carried out heat temperature raising, when the temperature of heating zone rise to the design temperature more than the Ac3 and keep constant after, begin air feed in stove by the nitrogen station, in stove, feed high-purity nitrogen, the furnace air emptying, the while starter motor, driving conveying belt 1 rotates, the workman puts the tooth base on ingress conveying belt 1, and conveying belt 1 is delivered to stove internal heating district to the tooth base and heats, and in heat preservation zone insulation for some time, after high temperature tooth base is delivered to nitrogen cooling zone 4 along with conveying belt 1, the high pressure low temperature nitrogen of nitrogen transfer line ejection carries out preliminary cooling fast, instantaneous with work-piece cools to Ac3, the workpiece temperature of this moment is 550 ℃, phase transformation is finished substantially, and oxidized no longer easily, last workpiece is carried fast and is dropped down onto by discharging portion 5 in the tote cart 8, further is cooled to normal temperature by 6 pairs of workpiece of blower fan, the gear ring moulding, normalizing thermal treatment is finished.
Above-mentioned normalizing thermal treatment is to carry out on nitrogen protection continuous type normalizing stove production line; in normalizing furnace whole heating and insulating process; in burner hearth, feed high-purity nitrogen; to reach the purpose of oxygen in isolation and the emptying burner hearth; the oxidation and decarbonization process that suppresses material surface; and before workpiece is come out of the stove; utilize the high pressure low temperature nitrogen in exit that material is carried out preliminary cooling fast; help the refinement of material inside organization and perfect, make the gear ring of final molding have favorable manufacturability and mechanical performance index.
Claims (8)
1. gear ring nitrogen protection continuous type normalizing stove; comprise burner hearth; conveying belt and discharging portion; conveying belt runs through burner hearth inside; be provided with the heating zone successively along entering the mouth to Way out in the burner hearth; heat preservation zone and nitrogen cooling zone; the heating zone is connected with the heat tracing system with heat preservation zone; the inlet of burner hearth is communicated with the heating zone; the outlet of burner hearth is communicated with the nitrogen cooling zone; it is characterized in that: described normalizing furnace also comprises the nitrogen station; the nitrogen station by transport pipe respectively with the heating zone; heat preservation zone is connected with the nitrogen cooling zone; the ingress of burner hearth is provided with a nitrogen inlet mouth; the exit of burner hearth is provided with two nitrogen inlet mouths; the outside of burner hearth ingress is provided with the inlet seal district, and the inlet seal district is skewed.
2. gear ring nitrogen protection continuous type normalizing stove according to claim 1 is characterized in that: described conveying belt is connected with motor.
3. gear ring nitrogen protection continuous type normalizing stove according to claim 1 and 2 is characterized in that: described conveying belt is a mesh-belt conveying portion.
4. gear ring nitrogen protection continuous type normalizing stove according to claim 2 is characterized in that: described motor is a frequency control motor.
5. gear ring nitrogen protection continuous type normalizing stove according to claim 1 is characterized in that: described heat tracing system comprises electric heating tube and thermopair.
6. gear ring nitrogen protection continuous type normalizing stove according to claim 1 is characterized in that: flame-proof sealing material is all adopted in described burner hearth entry and exit.
7. gear ring nitrogen protection continuous type normalizing stove according to claim 1 is characterized in that: described nitrogen gas delivery-line is provided with glass rotameter.
8. gear ring nitrogen protection continuous type normalizing stove according to claim 1 is characterized in that: the outside of described furnace outlet is provided with discharging portion, and the below of discharging portion is provided with blower fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201448883U CN201648470U (en) | 2010-03-30 | 2010-03-30 | Gear ring nitrogen-protecting continuous normalizing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201448883U CN201648470U (en) | 2010-03-30 | 2010-03-30 | Gear ring nitrogen-protecting continuous normalizing furnace |
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| Publication Number | Publication Date |
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| CN201648470U true CN201648470U (en) | 2010-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010201448883U Expired - Fee Related CN201648470U (en) | 2010-03-30 | 2010-03-30 | Gear ring nitrogen-protecting continuous normalizing furnace |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506245A (en) * | 2016-02-25 | 2016-04-20 | 马鞍山市伟群实业有限公司 | Mesh belt furnace and control method thereof |
| CN107955877A (en) * | 2017-11-27 | 2018-04-24 | 山东钢铁股份有限公司 | The control method of ultra low oxygen content in roller hearth heat-treated furnace |
| CN109929972A (en) * | 2019-04-02 | 2019-06-25 | 浙江明贺钢管有限公司 | A kind of steel pipe non-oxidation normalizing process and device |
| CN113584272A (en) * | 2021-05-28 | 2021-11-02 | 浙江华远汽车科技股份有限公司 | Heat treatment quenching device and method |
| CN113976097A (en) * | 2021-12-29 | 2022-01-28 | 山西炬华新材料科技有限公司 | Oxygen-controlling roasting device and method containing activated carbon carrier and catalyst |
| CN117210649A (en) * | 2023-09-21 | 2023-12-12 | 中科卓异环境科技(东莞)有限公司 | Steel normalizing equipment and steel normalizing method |
-
2010
- 2010-03-30 CN CN2010201448883U patent/CN201648470U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506245A (en) * | 2016-02-25 | 2016-04-20 | 马鞍山市伟群实业有限公司 | Mesh belt furnace and control method thereof |
| CN107955877A (en) * | 2017-11-27 | 2018-04-24 | 山东钢铁股份有限公司 | The control method of ultra low oxygen content in roller hearth heat-treated furnace |
| CN109929972A (en) * | 2019-04-02 | 2019-06-25 | 浙江明贺钢管有限公司 | A kind of steel pipe non-oxidation normalizing process and device |
| CN113584272A (en) * | 2021-05-28 | 2021-11-02 | 浙江华远汽车科技股份有限公司 | Heat treatment quenching device and method |
| CN113584272B (en) * | 2021-05-28 | 2023-03-07 | 浙江华远汽车科技股份有限公司 | Heat treatment quenching device and method |
| CN113976097A (en) * | 2021-12-29 | 2022-01-28 | 山西炬华新材料科技有限公司 | Oxygen-controlling roasting device and method containing activated carbon carrier and catalyst |
| CN113976097B (en) * | 2021-12-29 | 2022-03-08 | 山西炬华新材料科技有限公司 | Oxygen-controlling roasting device and method containing activated carbon carrier and catalyst |
| CN117210649A (en) * | 2023-09-21 | 2023-12-12 | 中科卓异环境科技(东莞)有限公司 | Steel normalizing equipment and steel normalizing method |
| CN117210649B (en) * | 2023-09-21 | 2024-05-14 | 中科卓异环境科技(东莞)有限公司 | Steel normalizing equipment and steel normalizing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20180330 |