CN115505693B - Tempering method adopting high-temperature box type quenching furnace - Google Patents
Tempering method adopting high-temperature box type quenching furnace Download PDFInfo
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- CN115505693B CN115505693B CN202211212401.4A CN202211212401A CN115505693B CN 115505693 B CN115505693 B CN 115505693B CN 202211212401 A CN202211212401 A CN 202211212401A CN 115505693 B CN115505693 B CN 115505693B
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- furnace
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- tempering
- cylinder sleeve
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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
- 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
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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
- C21D11/00—Process control or regulation for heat treatments
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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
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
Abstract
The invention discloses a tempering method of a high-temperature box-type quenching furnace, which comprises the steps of sequentially and firmly loading a cleaned and blow-dried cylinder sleeve into an upper layer and a lower layer of a quenching frame; the cylinder sleeve control trolley after quenching temperature treatment is taken out of a quenching furnace to perform medium quenching, an upper layer quenching cylinder sleeve is placed in a lower layer tempering frame, the lower layer quenching cylinder sleeve is placed in the upper layer tempering frame, a hot furnace is put into the furnace to temper by adopting a specific process curve, and then is taken out of the furnace to cool after tempering is finished, the quenching process at the present stage generally adopts a high-temperature air box type furnace to perform heating quenching treatment, the box type furnace does not have a circulating fan, the temperature in the furnace is not uniform, the furnace is generally only used for high-temperature quenching, the quenching process is difficult to be used for tempering treatment, and particularly, the temperature of the upper layer and the lower layer of the quenching cylinder sleeve is difficult to be ensured to be uniform; and tempering is more preferable to be performed by adopting a pit furnace with more uniform furnace temperature. The invention aims to solve the technical problem that when a product with a larger volume is tempered in a high-temperature air box-type quenching furnace, the hardness deviation of a cylinder sleeve is larger due to uneven heating.
Description
Technical Field
The invention relates to the technical field of tempering of cylinder sleeves, in particular to a tempering method adopting a high-temperature box-type quenching furnace.
Background
Quenching is carried out on the cylinder sleeve material of 38CrMoAl, quenching is finished in a box furnace, the quenching process is 930+/-10 ℃ for 2 hours, tempering is carried out in a pit furnace, the tempering process is 630+/-10 ℃ for 3 hours, and the hardness requirement can be basically met after the conventional process is quenched and tempered. Because the yield of the series of cylinder liners is not high, in order to reduce the energy consumption and shorten the working procedure time, the box type quenching furnace is ready for tempering: because the volume of the series of cylinder sleeves is larger, the whole quenching furnace chamber is basically fully covered, the furnace has no circulating fan, the temperature distribution of the upper and lower parts of the furnace chamber is very uneven, the development difficulty is greatly increased, and the cylinder sleeves are directly connected into the furnace for tempering according to the tempering process of 630+/-10 ℃ for 3 hours, so that the hardness deviation of the upper and lower layers of the treated cylinder sleeves is larger, and meanwhile, the temperature uniformity of the upper and lower layers of the cylinder sleeves is difficult to ensure, so that the process requirement is difficult to reach.
Disclosure of Invention
The invention aims to provide a tempering method by adopting a high-temperature box-type quenching furnace, which aims to solve the technical problem of larger hardness deviation of a cylinder sleeve caused by uneven heating in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a tempering method adopting a high-temperature box-type quenching furnace, which comprises the following steps:
s1, degreasing and scrubbing the inner cavity of the cylinder sleeve and the surface of the cylinder sleeve, and drying the cylinder sleeve by an air dryer;
s2, sequentially and firmly loading the cylinder sleeve treated in the S1 into an upper layer and a lower layer of a quenching frame for quenching treatment;
s3, controlling the trolley to enter a quenching furnace, and closing the quenching furnace door when the furnace temperature is reduced to 400-450 ℃;
s4, placing the upper-layer quenched cylinder sleeve treated in the S2 in a lower-layer tempering frame, and placing the lower-layer quenched cylinder sleeve in the upper-layer tempering frame;
s5, putting the hot furnace into the furnace for tempering, increasing the temperature in the quenching furnace to 645-655 ℃, preserving heat for 1.5h, then reducing the temperature to 620-630 ℃ and preserving heat for 2.5-3h;
s6, opening the quenching furnace door, lifting out the cylinder sleeve, air cooling, and ending tempering.
Optionally or preferably, a partition is provided at an upper portion of the tempering frame for reducing a temperature difference between the upper and lower layers.
Alternatively or preferably, the partition is mounted on the upper part of the tempering frame by welding.
Optionally or preferably, a heat insulation material is arranged at the bottom of the quenching furnace and used for delaying heat dissipation of the quenching furnace bottom plate.
Based on the technical scheme, the embodiment of the invention at least has the following technical effects:
1. according to the tempering frame, the heat-shielding steel plate is assembled on the upper frame wall, the lower layer is ventilated, the heating wire is prevented from directly baking the upper cylinder sleeve, heat is allowed to enter from the lower layer, the temperature difference between the upper layer and the lower layer is reduced, and the furnace wall product in the high-temperature area of the upper layer is prevented from being overheated in a short time. Meanwhile, the waste heat of the bottom steel plate of the quenching furnace is fully utilized, the temperature of the waste heat of the bottom steel plate is controlled by controlling the furnace inlet time of the trolley, a heat insulation material is additionally arranged at the furnace door opening, the heat dissipation of the furnace bottom plate is delayed, and the furnace can be quickly subjected to uniform temperature after the furnace is closed.
2. The two layers are arranged when the cylinder sleeve is quenched, the lower layer hardness is high after quenching, the upper layer hardness is low, the upper layer quenching cylinder sleeve is arranged on the lower layer tempering frame when tempering, the lower layer quenching cylinder sleeve is arranged on the upper layer tempering frame when tempering, the process effectively balances the problems of temperature difference between the upper region and the lower region in the furnace and the hardness deviation of the upper layer cylinder sleeve and the lower layer cylinder sleeve after tempering, and simultaneously designs a two-stage temperature control process for full-power temperature rise of a box quenching furnace, and the temperature difference in the furnace is quickly reduced by using heat radiation.
Drawings
FIG. 1 is a schematic illustration of an improvement of a tempering frame;
FIG. 2 is a timing diagram of a two-stage high temperature box quench tempering process;
in the figure: 1. tempering a frame; 2. a quenching furnace; 3. a thermal insulation material; 4. a partition board.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
The invention provides a tempering method adopting a high-temperature box-type quenching furnace, which comprises the following steps:
s1, degreasing and scrubbing the inner cavity of the cylinder sleeve and the surface of the cylinder sleeve, and drying the cylinder sleeve by an air dryer;
s2, sequentially and firmly loading the cylinder sleeve treated in the S1 into an upper layer and a lower layer of a quenching frame for quenching treatment;
s3, controlling the trolley to enter the quenching furnace 2, and closing a door of the quenching furnace 2 when the furnace temperature is reduced to 400-450 ℃;
s4, placing the upper-layer quenching cylinder sleeve treated in the S2 in a lower-layer tempering frame 1, and placing the lower-layer quenching cylinder sleeve in the upper-layer tempering frame 1;
s5, putting the hot furnace into the furnace for tempering, increasing the temperature in the quenching furnace 2 to 645-655 ℃ and preserving heat for 1.5h, then reducing the temperature to 620-630 ℃ and preserving heat for 2.5-3h;
s6, opening a door of the quenching furnace 2, lifting out the cylinder sleeve, air cooling, and ending tempering.
The invention provides a tempering method of a high-temperature box-type quenching furnace, which is characterized in that the box-type quenching furnace has no circulating fan and air guide sleeve, heat can be accumulated upwards in a short time, the temperature in the furnace is high and low, and the hardness deviation is large after the cylinder sleeve is processed and is difficult to meet the requirements. In addition, the heating wires are distributed on each wall in the furnace, the edge cylinder sleeve can be directly heated at a short distance, heat on the upper layer is easy to collect originally, the temperature is high, and the hardness of the cylinder sleeve, close to the heating wires, on the upper layer can be lower due to direct treatment. In order to improve the temperature of the cylinder sleeve close to the furnace wall and avoid overhigh local temperature, the tempering frame 1 is improved, the upper part of the square frame is covered by a steel plate, the heating wire is prevented from directly baking the upper cylinder sleeve, heat is allowed to enter from the lower part, and the temperature difference between the upper layer and the lower layer is reduced.
As an alternative embodiment, the upper part of the tempering frame 1 is provided with a baffle plate 4 for reducing the temperature difference of the upper layer and the lower layer; of course, other ways may be used to reduce the temperature difference between the upper and lower layers, such as selecting a material with low thermal conductivity on the frame material of the tempering frame 1, so long as the temperature difference between the upper and lower layers of the tempering frame 1 can be reduced.
As an alternative embodiment, the partition plate 4 is mounted on the upper part of the tempering frame 1 by welding, but it is also possible to use other connection means, such as bolting, to mount the partition plate 4 on the tempering frame 1.
As an optional implementation manner, the bottom of the quenching furnace 2 is provided with a heat insulation material 3 for delaying the heat dissipation of the quenching furnace bottom plate; of course, other modes can be adopted for delaying the heat dissipation of the quenching furnace bottom plate, for example, a layer of heat preservation induction coil is arranged on the quenching furnace bottom plate, and the like, so long as the heat dissipation of the quenching furnace bottom plate can be effectively delayed.
The tempering process by adopting the high-temperature box-type quenching furnace provided by the invention comprises the following steps:
in order to fully utilize the waste heat of the bottom plate of the furnace to provide heat for the lower cylinder sleeve, the furnace is tempered in a furnace feeding mode, the quenching rear trolley is fed into the furnace, the furnace door is opened, the air temperature in the furnace is reduced, the cooling of the furnace bottom trolley is delayed, and heat preservation equipment is additionally arranged at the furnace bottom. Because the cylinder sleeves are arranged in an upper layer and a lower layer, the hardness of the lower layer cylinder sleeves is generally higher after quenching, and the positions of the upper layer cylinder sleeves and the lower layer cylinder sleeves after quenching are required to be interchanged during tempering according to the temperature distribution rule of a box-type quenching furnace, the hardness of the upper layer cylinder sleeves and the lower layer cylinder sleeves can meet the requirements after being matched with related process treatment in the mode; designing and verifying that the optimal furnace closing temperature is 400-450 ℃, and matching with the design and verifying the tempering process of the two-section box-type quenching furnace: heating to 645-655 deg.c for 1.5 hr, cooling to 620-630 deg.c and maintaining for 2.5-3 hr; in addition, furnace charging tempering is carried out within 1h after quenching, the furnace charging tempering interval is shortened as far as possible, the waste heat of the furnace bottom plate is fully utilized for uniform temperature, and then the temperature is raised in full power.
While the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present invention, and these are intended to be included in the scope of the present invention as defined in the appended claims.
Claims (4)
1. The tempering method adopting the high-temperature box-type quenching furnace is characterized by comprising the following steps of:
s1, degreasing and scrubbing the inner cavity of the cylinder sleeve and the surface of the cylinder sleeve, and drying the cylinder sleeve by an air dryer;
s2, sequentially and firmly loading the cylinder sleeve treated in the S1 into an upper layer and a lower layer of a quenching frame for quenching treatment;
s3, controlling the trolley to enter the quenching furnace (2), and closing a door of the quenching furnace (2) when the furnace temperature is reduced to 400-450 ℃;
s4, placing the upper-layer quenching cylinder sleeve treated in the S2 in a lower-layer tempering frame (1), and placing the lower-layer quenching cylinder sleeve in the upper-layer tempering frame (1);
s5, putting the hot furnace into the furnace for tempering, increasing the temperature in the quenching furnace (2) to 645-655 ℃, preserving heat for 1.5h, then reducing the temperature to 620-630 ℃ and preserving heat for 2.5-3h;
s6, opening a door of the quenching furnace (2), lifting out the cylinder sleeve, air cooling, and ending tempering.
2. A method of tempering with a high temperature box quench furnace according to claim 1, wherein: the upper part of the tempering frame (1) is provided with a baffle plate (4) for reducing the temperature difference of the upper layer and the lower layer.
3. A method of tempering with a high temperature box quench furnace according to claim 2, wherein: the partition plate (4) is arranged at the upper part of the tempering frame (1) in a welding mode.
4. A method of tempering with a high temperature box quench furnace according to claim 1, wherein: the bottom of the quenching furnace (2) is provided with a heat insulation material (3) for delaying the heat dissipation of the quenching furnace bottom plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211212401.4A CN115505693B (en) | 2022-09-30 | 2022-09-30 | Tempering method adopting high-temperature box type quenching furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211212401.4A CN115505693B (en) | 2022-09-30 | 2022-09-30 | Tempering method adopting high-temperature box type quenching furnace |
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| CN115505693A CN115505693A (en) | 2022-12-23 |
| CN115505693B true CN115505693B (en) | 2023-06-06 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3915216A (en) * | 1972-09-06 | 1975-10-28 | Concast Ag | Method of controlling the secondary cooling of a continuously cast strand |
| JP2001041660A (en) * | 1999-08-02 | 2001-02-16 | Toyo-Ro Industries Co Ltd | Tempering furnace and tempering method |
| JP2005133212A (en) * | 2003-10-08 | 2005-05-26 | Ntn Corp | Heat treatment system |
| CN101914667A (en) * | 2010-07-27 | 2010-12-15 | 济南沃德汽车零部件有限公司 | Continuous quenching and tempering device for valve rod end |
| CN106119507A (en) * | 2016-08-23 | 2016-11-16 | 常州新区河海热处理工程有限公司 | A kind of Technology for Heating Processing reducing the deformation of gear shaft keyway |
| CN107841707A (en) * | 2017-10-31 | 2018-03-27 | 沈阳透平机械股份有限公司 | The deep ion nitriding process of 31CrMoV9 gears |
| CN109402363A (en) * | 2018-12-07 | 2019-03-01 | 高青 | A kind of energy-saving tempering furnace |
| CN110055386A (en) * | 2019-06-03 | 2019-07-26 | 河南天利热工装备股份有限公司 | Tempering product line automatic quenching device |
-
2022
- 2022-09-30 CN CN202211212401.4A patent/CN115505693B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3915216A (en) * | 1972-09-06 | 1975-10-28 | Concast Ag | Method of controlling the secondary cooling of a continuously cast strand |
| JP2001041660A (en) * | 1999-08-02 | 2001-02-16 | Toyo-Ro Industries Co Ltd | Tempering furnace and tempering method |
| JP2005133212A (en) * | 2003-10-08 | 2005-05-26 | Ntn Corp | Heat treatment system |
| CN101914667A (en) * | 2010-07-27 | 2010-12-15 | 济南沃德汽车零部件有限公司 | Continuous quenching and tempering device for valve rod end |
| CN106119507A (en) * | 2016-08-23 | 2016-11-16 | 常州新区河海热处理工程有限公司 | A kind of Technology for Heating Processing reducing the deformation of gear shaft keyway |
| CN107841707A (en) * | 2017-10-31 | 2018-03-27 | 沈阳透平机械股份有限公司 | The deep ion nitriding process of 31CrMoV9 gears |
| CN109402363A (en) * | 2018-12-07 | 2019-03-01 | 高青 | A kind of energy-saving tempering furnace |
| CN110055386A (en) * | 2019-06-03 | 2019-07-26 | 河南天利热工装备股份有限公司 | Tempering product line automatic quenching device |
Non-Patent Citations (1)
| Title |
|---|
| 热处理节能途径;许晓兰;煤矿机械(第12期);79-81 * |
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