CN101886163A - Gear blank isothermal annealing process and isothermal annealing production line - Google Patents
Gear blank isothermal annealing process and isothermal annealing production line Download PDFInfo
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- CN101886163A CN101886163A CN2009100688237A CN200910068823A CN101886163A CN 101886163 A CN101886163 A CN 101886163A CN 2009100688237 A CN2009100688237 A CN 2009100688237A CN 200910068823 A CN200910068823 A CN 200910068823A CN 101886163 A CN101886163 A CN 101886163A
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- isothermal annealing
- heating
- gear blank
- gear
- production line
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a heating treatment process for scale production of gear blanks and a corresponding heating treatment production line. The invention eliminates the integral recrystallization heating of the gear blanks, and gears can stably obtain a metallographic structure with excellent cutting performance and an expected hardness value no matter using a forging waste heat isothermal annealing process or an isothermal annealing process conducted after the blank is cooled of the invention.
Description
Technical field
Gear blank isothermal annealing technology that the present invention relates to and isothermal annealing production line belong to thermal treatment process and Equipment for Heating Processing field.
Background technology
In the existing technology, the thermal treatment of the gear blank of batch process mainly contains three kinds, i.e. normalizing (Fig. 1), normalizing+tempering (Fig. 2) and isothermal normalizing (Fig. 3), and workpiece all is heated to Ac by integral body in above-mentioned technology
3More than the point, carry out the cooling of different modes then.The thermal treatment of gear blank claims thermal treatment in advance again, and its effect is to eliminate forging stress, and the hardness that thinning microstructure and acquisition adapt to is beneficial to mechanical workout.Because the wheel of gear is auxilliary and endoporus generally adopts turning and broaching processing, this machining mode is not high to the requirement of metallographic structure, and gear hobbing and Gear Shaping need be adopted in the gear ring position, and this interrupted cut mode has higher requirement to metallographic structure and hardness.From the technology point of view of the economical rationality that obtains best cutting ability, the spoke of gear and the thermal treatment of gear ring allow there are differences, motivation of the present invention that Here it is.The whole heating process of tooth base of the prior art also is unfavorable for making gear ring accurately stably to obtain the metallographic structure with superior cutting ability.
Summary of the invention
At weak point in the prior art, the present invention has designed the isothermal annealing technology of formulating according to ferrous materials time temperature transformation curve (TTT song), and one of this characteristic feature of an invention is only recrystallization heating (Ac to be carried out at the gear ring position
3+ 50-80 ℃) and continue and carry out isothermal annealing, two of this characteristic feature of an invention is to adopt induction heating that through heating is carried out at the gear ring position.Its heat treatment cycle curve such as Fig. 4, shown in Figure 5, Fig. 4 is: gear blank residual forging heat isothermal annealing process curve synoptic diagram, the isothermal annealing process curve synoptic diagram of Fig. 5 for carrying out again after the forging cooling.
Tooth base isothermal annealing production line of the present invention constitutes synoptic diagram as shown in Figure 6, and 1 is feeder among the figure, and 2 is the net belt type soaking pit, and 3 is the heating in medium frequency stove, and 4 is the net belt type annealing furnace.The obvious difference of the present invention and prior art has 2 points, and one is no High Temperature Furnaces Heating Apparatus (800-950 a ℃), and two meshbeltfurnaces are low temperature oven, and the highest design temperature is 700 ℃; It is two for introducing induction heating device.
Practical application has proved the following advantage of this invention:
1, be to utilize the isothermal annealing technology (Fig. 5) of carrying out again after the isothermal annealing technology (Fig. 4) of residual forging heat or the forging cooling to guarantee that all the hardness at spoke position requires (HB187-207).
2, this invention is heated to tooth base integral body the required perlite isothermal transformation temperature of isothermal annealing in advance, the obvious benefit of only induction heating is carried out at the gear ring position is to guarantee the austenitizing state consistency then, and the consistence that cools to the perlitic transformation temperature from austenitizing temperature, simultaneously owing to adopted the induction heating technique of single-piece operation, this has just created favourable condition for accurately seeking best metallographic structure, and in meshbeltfurnace, carry out the integral body heating in the prior art, whole cooling then is difficult to the accurately heat treatment process of control tooth base.
3, this invention has remarkable advantages on energy-conservation, at first this technology exempted whole workpiece heat (800-950 ℃) this will make fire box temperature reduce to 650-680 ℃, this will greatly reduce the thermosteresis of furnace wall, also prolonged furnace life, and the induction heating of gear ring also just has 10-20 second, the efficient of transistor induction heating power can be up to 95%, and to compare energy-saving effect be significant with having technology now in this invention.
This invention combines technology and equipment together, thereby helps the industrialization process of this invention.
Description of drawings
Accompanying drawing 1: normalizing process curve synoptic diagram
Accompanying drawing 2: normalizing+tempering process curve synoptic diagram
Accompanying drawing 3: isothermal normalizing process curve synoptic diagram
Accompanying drawing 4: residual forging heat isothermal annealing process curve synoptic diagram
Accompanying drawing 5: isothermal annealing process curve synoptic diagram
Accompanying drawing 6: the isothermal annealing production line constitutes synoptic diagram
Embodiment
Elaborate below in conjunction with accompanying drawing 4 and 6 pairs of concrete enforcements of the present invention of accompanying drawing.
Accompanying drawing 4 is a forging preheating isothermal annealing process curve synoptic diagram of the present invention, by this processing requirement, gear blank available travelling belt after the die hammer depanning is sent blank into net belt type soaking pit among Fig. 6, soaking temperature is chosen according to the TTT curve of forging stock steel grade, blank drops down onto heating in medium frequency stove workspace automatically behind the samming, this moment, blank was packed in the intermediate frequency inductor by artificial or automatic loading machine, the heating in medium frequency program start, stop heating after being heated to predetermined austenitizing temperature, gear blank is sent into the net belt type annealing furnace by artificial or automatic emptying machine and is carried out isothermal annealing, the isothermal annealed time judges also that by metallographic structure the adjusting process parameter meets the requirement of HB187-207 to guarantee annealed blank hardness in view of the above, uses the present invention to the 20CrMnTi steel billet, the 42CrMo steel billet, 30Cr
2MoV steel-tooth wheel blank is heat-treated, and all reaches predetermined hardness requirement, and the hardness difference≤5HB of every tooth base, and satisfies every cutting ability requirement.
Example of the present invention illustrates that this technology is that favourable condition has been created in the simulation control of quantizing of thermal treatment process, and the heat treatment cycle of gear blank has also been shortened in this invention simultaneously.
Claims (2)
1. the gear blank isothermal annealing technology of a batch process, its heat treatment cycle curve synoptic diagram is seen figure (4), figure (5), its technical characterictic has been to remove the whole recrystallization heating of gear blank, only adopts induction through heating mode to implement local austenitizing to the gear ring position and handles.
2. gear blank isothermal annealing production line that is used to produce in batches, its main composition synoptic diagram is seen accompanying drawing (6), its equipment constitutive characteristic is to have designed heating in medium frequency stove workspace and the austenitizing heating is carried out at the gear ring position, and the gear blank heat treatment process is shown in figure (4), figure (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100688237A CN101886163A (en) | 2009-05-13 | 2009-05-13 | Gear blank isothermal annealing process and isothermal annealing production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100688237A CN101886163A (en) | 2009-05-13 | 2009-05-13 | Gear blank isothermal annealing process and isothermal annealing production line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101886163A true CN101886163A (en) | 2010-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100688237A Pending CN101886163A (en) | 2009-05-13 | 2009-05-13 | Gear blank isothermal annealing process and isothermal annealing production line |
Country Status (1)
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| CN (1) | CN101886163A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302464A (en) * | 2013-06-26 | 2013-09-18 | 天津市天瑞硬化工程有限公司 | Anti-fatigue manufacturing method of car transmission gear |
| CN103468913A (en) * | 2013-09-06 | 2013-12-25 | 内蒙古北方重工业集团有限公司 | Heat treatment method for steel grain refinement of ultrahigh pressure vessel |
| CN104128777A (en) * | 2014-07-29 | 2014-11-05 | 成都亨通兆业精密机械有限公司 | Turning tool machining technology capable of reducing heat damage and improving tempering quality |
| CN105420480A (en) * | 2015-11-28 | 2016-03-23 | 重庆市首业机械制造有限公司 | Basin angle gear annealing process |
| CN106086374A (en) * | 2016-06-04 | 2016-11-09 | 马鞍山钢铁股份有限公司 | One utilizes residual forging heat to carry out the most isothermal annealed rolling stock axletree Technology for Heating Processing |
-
2009
- 2009-05-13 CN CN2009100688237A patent/CN101886163A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302464A (en) * | 2013-06-26 | 2013-09-18 | 天津市天瑞硬化工程有限公司 | Anti-fatigue manufacturing method of car transmission gear |
| CN103302464B (en) * | 2013-06-26 | 2015-06-10 | 天津市天瑞硬化工程有限公司 | Anti-fatigue manufacturing method of car transmission gear |
| CN103468913A (en) * | 2013-09-06 | 2013-12-25 | 内蒙古北方重工业集团有限公司 | Heat treatment method for steel grain refinement of ultrahigh pressure vessel |
| CN104128777A (en) * | 2014-07-29 | 2014-11-05 | 成都亨通兆业精密机械有限公司 | Turning tool machining technology capable of reducing heat damage and improving tempering quality |
| CN105420480A (en) * | 2015-11-28 | 2016-03-23 | 重庆市首业机械制造有限公司 | Basin angle gear annealing process |
| CN106086374A (en) * | 2016-06-04 | 2016-11-09 | 马鞍山钢铁股份有限公司 | One utilizes residual forging heat to carry out the most isothermal annealed rolling stock axletree Technology for Heating Processing |
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Application publication date: 20101117 |