CN103725837A - Die quenching process and equipment for free cooling in oil and martensitic transformation on machine tool - Google Patents
Die quenching process and equipment for free cooling in oil and martensitic transformation on machine tool Download PDFInfo
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- CN103725837A CN103725837A CN201410030979.7A CN201410030979A CN103725837A CN 103725837 A CN103725837 A CN 103725837A CN 201410030979 A CN201410030979 A CN 201410030979A CN 103725837 A CN103725837 A CN 103725837A
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Abstract
The invention relates to a quenching process in the heat treatment industry, and specifically relates to a die quenching process and equipment for free cooling in oil and martensitic transformation on a machine tool. The process comprises the following steps of after the heating of parts in a heating furnace is finished, dropping the parts in an oil quenching tank in a batch or singly through a closed channel connected with the heating furnace; after the workpieces drop into the oil quenching tank, staying for 3 seconds to 5 minutes free cooling until the temperature is 20-120 DEG C above the martensitic transformation temperature point; after the workpieces are freely cooled to the cooling temperature, taking the workpieces out of the oil quenching tank through a mesh belt conveying mechanism, and orderly feeding the workpieces into a die quenching machine tool through a clamping jaw or manually for die quenching; and further cooling the workpieces on the die quenching machine tool until the temperature is below the martensitic transformation temperature point for martensitic transformation. According to the invention, the respective shortcomings and use limitations of the traditional oil quenching and die quenching processes are solved; the die quenching process and equipment provided by the invention are especially suitable for heating quenching of parts such as a bearing ring and a friction ring.
Description
Technical field
The present invention relates to the quenching technology in heat treatment industry, the die quenching Processes and apparatus that specifically in a kind of oil, freely cooling, lathe Markov body changes.
Background technology
At present, the quenching technology of parts such as bearing ring, friction ring has two kinds, the GCr15 bearing ring workpiece of take is example: a kind of is that oil immersion is quenched, be that workpiece is heated to after 830 ℃-860 ℃ in process furnace, enter oil-quenching tank, in oil, from red heat state, be directly cooled to, below martensite transformation temperature (Ms point: 200 ℃), complete martensitic transformation.Advantage is: technique is simple, and output is large; Shortcoming is: due to the acting in conjunction of thermal stresses and structural transformation stress, thin-walled parts distortion is larger, and material use efficiency is low, and often causes waste product.Another kind is die quenching, be that workpiece is heated to after 830 ℃-860 ℃ in process furnace, directly from process furnace, transfer to quenching machine and carry out die quenching, on quenching machine, be cooled to, below martensite transformation temperature (Ms point: 200 ℃), complete martensitic transformation.Advantage is: due to the effect of pressing mold, part deformation is little, and material use efficiency is high, and scrap rate is low; Shortcoming is: under red heat state, workpiece shifts in air, is easily oxidized, turns black, damages, and transfer efficiency is low simultaneously, and output is little.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of advantage that possesses oil immersion quenching technology and die quenching technique is provided, and can overcomes the die quenching Processes and apparatus that in the oil of oil immersion quenching technology and die quenching technique shortcoming, freely cooling, lathe Markov body changes.
The technical scheme that the present invention solves described problem employing is:
The die quenching technique that in oil, freely cooling, lathe Markov body changes, carry out in the steps below:
A., after part has heated in process furnace, by the enclosed passage connecting with process furnace, batch or single-piece fall into oil-quenching tank;
B. after workpiece falls into oil-quenching tank, stop 3 seconds-5 minutes, carry out freedom cooling, be cooled to above 20-120 ℃ of martensite transformation temperature point;
C. workpiece is freely cooled to after cooling temperature, and by mesh-belt conveying, mechanism pulls workpiece out from oil-quenching tank, then by jaw or by manually sending into successively die quenching lathe, carries out die quenching;
D. workpiece is cooled to below martensite transformation temperature point in the enterprising step of die quenching lathe, carries out martensitic transformation.
Further, in described step a, the gas in enclosed passage comes from the shielding gas in process furnace.
The specific equipment of realizing above-mentioned technique is:
Described specific equipment comprises process furnace, oil-quenching tank, die quenching lathe, between described oil-quenching tank and process furnace, is connected with seal channel, and described seal channel lower end extend into below oil-quenching tank pasta; Between described oil-quenching tank and die quenching lathe, be provided with mesh-belt conveying mechanism, described mesh-belt conveying mechanism one end extend into below oil-quenching tank pasta, and the other end is corresponding with the die quenching station of die quenching lathe.
Further, described mesh-belt conveying mechanism is comprised of tilt transportation section and level transportation section, and lower end, described inclination transportation section extend in oil-quenching tank pasta, and described horizontal feed segment trailer is provided with the electronic jaw for grabbing workpiece.
Adopt the present invention of technique scheme, compared with prior art, its outstanding feature is:
Drawback and use limitation that traditional oil immersion quenching technology and die quenching technique exist have separately been solved.Processes and apparatus dependable performance, purposes is flexible, and deformation of products is little, scrap rate is low, output is large, the heating quenching of the parts such as suitable especially bearing ring, friction ring, and can expand in the salt of other like parts, in water-soluble medium freely cooling, martensitic transformation die quenching technique.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention process device structure schematic diagram.
In figure: process furnace 1, workpiece 2, seal channel 3, oil-quenching tank 4, mesh-belt conveying mechanism 5, electronic jaw 6, die quenching station 7, die quenching lathe 8.
Embodiment
Below in conjunction with embodiment, the invention will be further described, and object is only better to understand content of the present invention.Therefore, the cited case not limits the scope of the invention.
The present embodiment be take the quenching of the GCr15 bearing ring that wall thickness is 7mm and is described.
Referring to Fig. 1, specific equipment in the present embodiment is by process furnace 1, seal channel 3, oil-quenching tank 4, mesh-belt conveying mechanism 5, electronic jaw 6, die quenching lathe 8 form, seal channel 3 upper ends and process furnace 1 are tightly connected, lower end extend into below the pasta of oil-quenching tank 4, gas in enclosed passage 3 comes from the shielding gas in process furnace 1, as N2, methanol decomposition gas, RX gas, CH4, acetone splitting gas etc.; Between oil-quenching tank 4 and die quenching lathe 8, be provided with mesh-belt conveying mechanism 5, this mesh-belt conveying mechanism 5 is comprised of inclination transportation section and level transportation section, lower end, inclination transportation section extend in oil-quenching tank 4 pastas, and horizontal feed segment trailer is provided with the electronic jaw 6 for grabbing workpiece.
Adopt above-mentioned specific equipment to carry out the die quenching technique that in oil, freely cooling, lathe Markov body changes, carry out in the steps below:
1. workpiece 2 is heated to after 830 ℃-860 ℃ in process furnace 1, via seal channel 3, enters in batches oil-quenching tank 4.
2. workpiece 2 is falling into the process of oil-quenching tank 4 through enclosed passage 3, and the provide protection by shielding gas (N2+ methanol decomposition gas+acetone splitting gas) in the inner, can guarantee that the workpiece 2 of red heat is not oxidized.
3. it is cooling that workpiece 2 carries out the freedom of 20 seconds in oil-quenching tank 4, is cooled to above 60 ℃ of martensite transformation temperature point (Ms=200 ℃), 260 ℃ (freely cooling time, the temperature that is cooled to determine according to the wall thickness of workpiece and material).
4., after workpiece 2 is freely cooled to temperature spot, by mesh-belt conveying mechanism 5, workpiece is pulled out from oil-quenching tank 4, though now workpiece 2 temperature, more than Ms point, have been black hard states, the problem that there is no surface oxidation and damage.
The workpiece 2 that ⑤Cong mesh-belt conveying mechanism 5 pulls out, then by electronic jaw 6(or pneumatic, hydraulic pressure jaw, also can be by artificial) send into successively die quenching station 7 belows of die quenching lathe 8, then carry out die quenching.
6. workpiece 2 is further cooled to below Ms point on die quenching lathe 8, carries out martensitic transformation, and the thermal distortion before proofreading and correct, and has limited to greatest extent the stress deformation producing when martensitic stucture changes simultaneously.
Above-mentioned die quenching lathe 8 can be designed to single station or multi-work-station.
Claims (4)
1. the die quenching technique that in oil, freely cooling, lathe Markov body changes, is characterized in that, carries out in the steps below:
A., after part has heated in process furnace, by the enclosed passage connecting with process furnace, batch or single-piece fall into oil-quenching tank;
B. after workpiece falls into oil-quenching tank, stop 3 seconds-5 minutes, carry out freedom cooling, be cooled to above 20-120 ℃ of martensite transformation temperature point;
C. workpiece is freely cooled to after cooling temperature, and by mesh-belt conveying, mechanism pulls workpiece out from oil-quenching tank, then by jaw or by manually sending into successively die quenching lathe, carries out die quenching;
D. workpiece is cooled to below martensite transformation temperature point in the enterprising step of die quenching lathe, carries out martensitic transformation.
2. the die quenching technique that in oil according to claim 1, freely cooling, lathe Markov body changes, is characterized in that, the gas in described step a in enclosed passage comes from the shielding gas in process furnace.
3. the specific equipment of the die quenching technique that in an oil as claimed in claim 1, freely cooling, lathe Markov body changes, comprise process furnace, oil-quenching tank, die quenching lathe, it is characterized in that, between described oil-quenching tank and process furnace, be connected with seal channel, described seal channel lower end extend into below oil-quenching tank pasta; Between described oil-quenching tank and die quenching lathe, be provided with mesh-belt conveying mechanism, described mesh-belt conveying mechanism one end extend into below oil-quenching tank pasta, and the other end is corresponding with the die quenching station of die quenching lathe.
4. the specific equipment of the die quenching technique that in oil according to claim 3, freely cooling, lathe Markov body changes, it is characterized in that, described mesh-belt conveying mechanism is comprised of tilt transportation section and level transportation section, lower end, described inclination transportation section extend in oil-quenching tank pasta, and described horizontal feed segment trailer is provided with the electronic jaw for grabbing workpiece.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410030979.7A CN103725837A (en) | 2014-01-23 | 2014-01-23 | Die quenching process and equipment for free cooling in oil and martensitic transformation on machine tool |
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| CN201410030979.7A CN103725837A (en) | 2014-01-23 | 2014-01-23 | Die quenching process and equipment for free cooling in oil and martensitic transformation on machine tool |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108728617A (en) * | 2018-08-23 | 2018-11-02 | 襄阳唐福机电科技有限公司 | A kind of higher high frequency of safety quenchs device |
| CN109457090A (en) * | 2018-12-19 | 2019-03-12 | 佛山勇精锻有限公司 | A kind of oil-quenching tank for bolt |
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| JPH09176740A (en) * | 1995-12-26 | 1997-07-08 | Ntn Corp | Production of bearing ring for ball bearing |
| EP1033413A2 (en) * | 1999-03-04 | 2000-09-06 | Karl Heess Gmbh & Co. Maschinenbau | Quenching device for workpieces |
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| CN202139274U (en) * | 2011-07-02 | 2012-02-08 | 黑旋风锯业股份有限公司 | Continuous pressurizing, oil injection and quenching device |
| CN102899459A (en) * | 2011-07-25 | 2013-01-30 | 日本精工株式会社 | Pressure quenching method and pressure quenching apparatus for workpiece |
| CN103014246A (en) * | 2011-09-28 | 2013-04-03 | 昆山鑫昌泰模具科技有限公司 | Metal heat treatment deformation cooling calibration synchronization method |
| CN203700431U (en) * | 2014-01-23 | 2014-07-09 | 唐山亚捷机械有限公司 | Die quenching equipment with free cooling in oil and martensitic transformation on machine tool |
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2014
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| GB881871A (en) * | 1958-01-31 | 1961-11-08 | British Furnaces Ltd | Method of and apparatus for press quenching metal articles |
| JPH09176740A (en) * | 1995-12-26 | 1997-07-08 | Ntn Corp | Production of bearing ring for ball bearing |
| EP1033413A2 (en) * | 1999-03-04 | 2000-09-06 | Karl Heess Gmbh & Co. Maschinenbau | Quenching device for workpieces |
| CN101809174A (en) * | 2007-09-28 | 2010-08-18 | Ntn株式会社 | Quenching method and device of ring-shaped article |
| CN202139274U (en) * | 2011-07-02 | 2012-02-08 | 黑旋风锯业股份有限公司 | Continuous pressurizing, oil injection and quenching device |
| CN102899459A (en) * | 2011-07-25 | 2013-01-30 | 日本精工株式会社 | Pressure quenching method and pressure quenching apparatus for workpiece |
| CN103014246A (en) * | 2011-09-28 | 2013-04-03 | 昆山鑫昌泰模具科技有限公司 | Metal heat treatment deformation cooling calibration synchronization method |
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| 中国机械工程学会热处理学会《热处理手册》编委会: "《热处理手册第3卷热处理设备和工辅材料 第3版》", 31 January 2002, 机械工业出版社, article "热处理手册第3卷热处理设备和工辅材料", pages: 188 - 535-536 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108728617A (en) * | 2018-08-23 | 2018-11-02 | 襄阳唐福机电科技有限公司 | A kind of higher high frequency of safety quenchs device |
| CN109457090A (en) * | 2018-12-19 | 2019-03-12 | 佛山勇精锻有限公司 | A kind of oil-quenching tank for bolt |
| CN109457090B (en) * | 2018-12-19 | 2024-03-15 | 佛山勇一精锻有限公司 | A quenching oil groove for bolt |
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