CN110923619A - Carburizing and quenching composite heat treatment production line and treatment method - Google Patents
Carburizing and quenching composite heat treatment production line and treatment method Download PDFInfo
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- CN110923619A CN110923619A CN201911330155.0A CN201911330155A CN110923619A CN 110923619 A CN110923619 A CN 110923619A CN 201911330155 A CN201911330155 A CN 201911330155A CN 110923619 A CN110923619 A CN 110923619A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/58—Oils
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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
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
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Abstract
The invention belongs to the technical field of heat treatment, and particularly relates to a carburizing and quenching composite heat treatment production line and a treatment method, which comprise the following steps: s1, placing the workpiece in a furnace body, and heating the carburizing zone of the furnace body to 92525 ℃ through a heat source; step S2, spraying fog-shaped quenching oil through a spraying device in the carburizing zone, and continuously spraying for 1.2-1.5 h; step S3, stopping heat supply of the heat source, lowering the workpiece to an isothermal zone in the furnace body, and opening a vent connected with the cooling pool at the bottom of the heat source; the sectional furnace body is adopted, the process procedures are simplified, the carburizing, the isothermal quenching and the tempering are carried out in one furnace body, the temperature control is convenient, the switching operation among the process procedures is simple, the spray device in the carburizing area is used for spraying mist quenching oil to carburize the surface of a workpiece, the carburizing process is soft, the range is wide, the obtained carburized layer is dense and reliable, the processing time can be reduced in the whole process, the production cost is saved, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of heat treatment, and particularly relates to a carburizing and quenching composite heat treatment production line and a treatment method.
Background
Carburizing and quenching play an important role in the heat treatment of metal materials, and carburizing is the most widely applied chemical heat treatment method in the mechanical manufacturing industry at present and can improve the wear resistance and fatigue strength of the materials; quenching is the most important and widely used process in the heat treatment process, and can obviously improve the strength and the hardness of the metal material.
In the existing carburizing and quenching process, the temperature is reduced to the quenching temperature after carburization, direct quenching is carried out after heat preservation, the method is easy to cause the material to have coarse grains and large brittleness, the structural stress of a workpiece is large, the material is directly discharged from a furnace for air cooling after carburization or is discharged from the furnace for entering a slow cooling pit for cooling to room temperature, then the material is re-fed into the furnace for heating and quenching, the cooling speed after carburization of the workpiece has strict requirements, otherwise, the surface layer structure and the subsurface layer structure of the workpiece are not synchronously transformed during cooling, so that the surface of the workpiece generates large tensile stress, the workpiece is easy to crack, deep carburized parts with high requirements on service performance are obtained, in order to ensure the quality indexes of a surface carburized layer and a core structure at the same time, two times of quenching can be carried out by heating to the core Ac + (30-50) DEG C for the first time and heating to the surface, the method has the advantages that on one hand, the carburized workpiece needs to be cooled to a certain temperature in the furnace to be discharged, the lower the discharging temperature is, the more beneficial the oxidation and decarburization on the surface of the workpiece is, but the lower the furnace temperature is, the lower the cooling speed of the workpiece is.
Disclosure of Invention
The invention provides a carburizing and quenching composite heat treatment production line and a treatment method, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a carburizing and quenching composite heat treatment production line and a treatment method comprise the following steps:
s1, placing the workpiece in a furnace body, and heating the carburizing zone of the furnace body to 92525 ℃ through a heat source;
step S2, spraying fog-shaped quenching oil through a spraying device in the carburizing zone, and continuously spraying for 1.2-1.5 h;
step S3, stopping heat supply of the heat source, lowering the workpiece to an isothermal zone in the furnace body, opening a vent connected with a cooling pool at the bottom of the heat source, and cooling to 61010 ℃ by adopting air cooling heat dissipation for 1-1.2 h;
s4, closing a vent connected with the cooling pool at the bottom of the heat source, lifting the workpiece to a carburizing area in the furnace body, heating the carburizing area to 84010 ℃ by the heat source, and continuing for 1-1.2 hours;
and step S5, stopping the heat source, lowering the workpiece to the isothermal zone in the furnace body again, opening a ventilation opening at the bottom of the heat source, connecting a cooling pool, spraying cooling oil mist by using a fan and a spraying device at the isothermal zone, performing air cooling for 0.3h, performing mist cooling for 0.1h, and lowering the temperature to 22010 ℃.
Preferably, in step S1, the heat source is heated by a ring-shaped coal stove or an electric stove.
Preferably, in step S1, the temperature is increased at a rate of 50 ℃/min during the heating to 92525 ℃.
Preferably, in step S2, the oil mist particles of the quenching oil sprayed by the spray device are 25 to 50 microns.
Preferably, in the step S2, the quenching oil is prepared from, by weight, 75-80 parts of 150N type II base oil, 4-9 parts of octylphenol polyoxyethylene ether, 20-28 parts of palm wax, 10-16 parts of 52% chlorinated paraffin, 1-2 parts of poly- α -olefin, 30-35 parts of epoxidized castor oil, 0.5-2 parts of potassium molybdate, 0.5-2 parts of propylene oxide and 4-16 parts of modified antioxidant.
Preferably, in step S3, the workpiece is cooled by a bottom-up gas supply method at a cooling rate of 20 ℃/min.
Preferably, in step S5, the diameter of the cooling oil mist sprayed by the spraying device is 30-50 microns.
The processing production line of the carburizing and quenching composite heat treatment comprises the equipment in the processing method of the carburizing and quenching composite heat treatment.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a sectional furnace body, simplifies the process procedures, carries out carburizing, isothermal quenching and tempering in one furnace body, has convenient temperature control and simple switching operation between the process procedures, uses a spray device in a carburizing area to spray mist quenching oil to carburize the surface of a workpiece, has soft carburizing process, wide range and dense and reliable carburized layer, can reduce the processing time in the whole process, saves the production cost and improves the production efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a furnace body; 101. an isothermal zone; 102. a carburized region; 2. a heat source; 3. and (4) cooling the pool.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides the following technical solutions: a carburizing and quenching composite heat treatment production line and a treatment method comprise the following steps:
s1, placing the workpiece in a furnace body 1, and heating the carburizing zone 102 of the furnace body 1 to 900 ℃ through a heat source 2;
step S2, spraying fog-like quenching oil through a spraying device in the carburizing zone 102, and continuously spraying for 1.5 h;
step S3, stopping heat supply of the heat source 2, lowering the workpiece to the isothermal zone 101 in the furnace body 1, opening a ventilation opening connecting the bottom of the heat source 2 and the cooling pool 3, and cooling to 600 ℃ by adopting air cooling heat dissipation for 1 hour;
step S4, closing a vent connected with the cooling pool 3 at the bottom of the heat source 2, lifting the workpiece to the carburizing zone 102 in the furnace body 1, heating the carburizing zone 102 to 830 ℃ by the heat source 2, and continuing for 1 h;
and S5, stopping the heat source 2, cooling the workpiece to the isothermal zone 101 in the furnace body 1 again, opening a ventilation opening at the bottom of the heat source 2 connected with the cooling tank 3, spraying cooling oil mist by using a fan and a spraying device at the isothermal zone 101, performing air cooling for 0.3h, performing mist cooling for 0.1h, and cooling to 210 ℃.
In the embodiment, a workpiece is placed in a furnace body 1, and a carburizing zone 102 of the furnace body 1 is heated to 900 ℃ by a heat source 2; spraying fog-shaped quenching oil through a spraying device in the carburizing zone 102, and continuously spraying for 1.5 hours; stopping supplying heat to the heat source 2, lowering the workpiece to an isothermal zone 101 in the furnace body 1, opening a ventilation opening connecting the bottom of the heat source 2 and the cooling pool 3, and cooling to 600 ℃ by adopting air cooling for 1 hour; closing a vent connected with the bottom of the heat source 2 and the cooling pool 3, lifting the workpiece to a carburizing zone 102 in the furnace body 1, heating the carburizing zone 102 by the heat source 2 to 830 ℃, and continuing for 1 h; stopping the heat source 2, lowering the workpiece to the isothermal zone 101 in the furnace body 1 again, opening a ventilation opening at the bottom of the heat source 2 connected with the cooling pool 3, spraying cooling oil mist by using a fan and a spraying device at the isothermal zone 101, performing air cooling for 0.3h, performing mist cooling for 0.1h, and lowering the temperature to 210 ℃.
Specifically, in step S1, the heat source 2 is heated by a ring-shaped coal stove or an electric stove.
Specifically, in step S1, the temperature is raised at a rate of 50 ℃/min during the heating to 900 ℃.
Specifically, in step S2, the oil mist particles of the quenching oil ejected from the spray device are 25 to 50 μm.
Specifically, in step S2, the quenching oil is prepared from, by weight, 75-80 parts of 150N type II base oil, 4-9 parts of octylphenol polyoxyethylene ether, 20-28 parts of palm wax, 10-16 parts of 52% chlorinated paraffin, 1-2 parts of poly- α -olefin, 30-35 parts of epoxidized castor oil, 0.5-2 parts of potassium molybdate, 0.5-2 parts of propylene oxide and 4-16 parts of a modified antioxidant.
Specifically, in step S3, the workpiece is cooled by a bottom-up gas supply method at a cooling rate of 20 ℃/min.
Specifically, in step S5, the diameter of the cooling oil mist sprayed from the spraying device is 30 to 50 microns.
The carburizing and quenching composite heat treatment production line carries out heat treatment by utilizing the equipment in the scheme.
Example 2
Referring to fig. 1, the present invention provides the following technical solutions: a carburizing and quenching composite heat treatment production line and a treatment method comprise the following steps:
s1, placing the workpiece in a furnace body 1, and heating the carburizing zone 102 of the furnace body 1 to 950 ℃ through a heat source 2;
step S2, spraying fog-like quenching oil through a spraying device in the carburizing zone 102, and continuously spraying for 1.5 h;
step S3, stopping heat supply of the heat source 2, lowering the workpiece to the isothermal zone 101 in the furnace body 1, opening a ventilation opening connecting the bottom of the heat source 2 and the cooling pool 3, and lowering the temperature to 620 ℃ by adopting air cooling heat dissipation for 1-1.2 hours;
s4, closing a vent connected with the cooling pool 3 at the bottom of the heat source 2, lifting the workpiece to the carburizing zone 102 in the furnace body 1, heating the carburizing zone 102 to 850 ℃ through the heat source 2, and continuing for 1-1.2 h;
and step S5, stopping the heat source 2, lowering the workpiece to the isothermal zone 101 in the furnace body 1 again, opening a ventilation opening connecting the bottom of the heat source 2 and the cooling tank 3, spraying cooling oil mist by adopting a fan and a spraying device at the isothermal zone 101, performing air cooling for 0.3h, performing mist cooling for 0.1h, and lowering the temperature to 230 ℃.
In the embodiment, a workpiece is placed in a furnace body 1, and a carburizing zone 102 of the furnace body 1 is heated to 950 ℃ by a heat source 2; spraying fog-shaped quenching oil through a spraying device in the carburizing zone 102, and continuously spraying for 1.5 hours; stopping heat supply of the heat source 2, lowering the workpiece to the isothermal zone 101 in the furnace body 1, opening a ventilation opening connecting the bottom of the heat source 2 and the cooling pool 3, and cooling to 620 ℃ by adopting air cooling for 1-1.2 h; closing a vent connected with the bottom of the heat source 2 and the cooling pool 3, lifting the workpiece to a carburizing zone 102 in the furnace body 1, heating the carburizing zone 102 to 850 ℃ through the heat source 2, and continuing for 1-1.2 h; stopping the heat source 2, lowering the workpiece to the isothermal zone 101 in the furnace body 1 again, opening a ventilation opening at the bottom of the heat source 2 connected with the cooling pool 3, spraying cooling oil mist by using a fan and a spraying device at the isothermal zone 101, performing air cooling for 0.3h, performing mist cooling for 0.1h, and lowering the temperature to 230 ℃.
Specifically, in step S1, the heat source 2 is heated by a ring-shaped coal furnace.
Specifically, in step S1, the temperature is raised at a rate of 50 ℃/min during the heating to 950 ℃.
Specifically, in step S2, the oil mist particles of the quenching oil ejected from the spray device are 25 to 50 μm.
Specifically, in step S2, the quenching oil is prepared from, by weight, 75-80 parts of 150N type II base oil, 4-9 parts of octylphenol polyoxyethylene ether, 20-28 parts of palm wax, 10-16 parts of 52% chlorinated paraffin, 1-2 parts of poly- α -olefin, 30-35 parts of epoxidized castor oil, 0.5-2 parts of potassium molybdate, 0.5-2 parts of propylene oxide and 4-16 parts of a modified antioxidant.
Specifically, in step S3, the workpiece is cooled by a bottom-up gas supply method at a cooling rate of 20 ℃/min.
Specifically, in step S5, the diameter of the cooling oil mist sprayed from the spraying device is 30 to 50 microns.
The carburizing and quenching composite heat treatment production line carries out heat treatment by utilizing the equipment in the scheme.
Example 3
Referring to fig. 1, the present invention provides the following technical solutions: a carburizing and quenching composite heat treatment production line and a treatment method comprise the following steps:
s1, placing the workpiece in a furnace body 1, and heating the carburizing zone 102 of the furnace body 1 to 925 ℃ through a heat source 2;
step S2, spraying fog-shaped quenching oil through a spraying device in the carburizing zone 102, and continuously spraying for 1.3 h;
step S3, stopping heat supply of the heat source 2, lowering the workpiece to the isothermal zone 101 in the furnace body 1, opening a ventilation opening connecting the bottom of the heat source 2 and the cooling pool 3, and lowering the temperature to 610 ℃ by adopting air cooling heat dissipation for 12 hours;
s4, closing a vent connected with the cooling pool 3 at the bottom of the heat source 2, lifting the workpiece to a carburizing zone 102 in the furnace body 1, heating the carburizing zone 102 to 840 ℃ through the heat source 2, and continuing for 1-1.2 h;
and S5, stopping the heat source 2, cooling the workpiece to the isothermal zone 101 in the furnace body 1 again, opening a ventilation opening at the bottom of the heat source 2 connected with the cooling tank 3, spraying cooling oil mist by using a fan and a spraying device at the isothermal zone 101, performing air cooling for 0.3h, performing mist cooling for 0.1h, and cooling to 220 ℃.
In the embodiment, a workpiece is placed in a furnace body 1, and a carburizing zone 102 of the furnace body 1 is heated to 925 ℃ through a heat source 2; spraying fog-shaped quenching oil through a spraying device in the carburizing zone 102, and continuously spraying for 1.3 h; stopping supplying heat to the heat source 2, lowering the workpiece to the isothermal zone 101 in the furnace body 1, opening a ventilation opening connecting the bottom of the heat source 2 and the cooling pool 3, and cooling to 610 ℃ by adopting air cooling for 12 hours; closing a vent connected with the bottom of the heat source 2 and the cooling pool 3, lifting the workpiece to a carburizing zone 102 in the furnace body 1, heating the carburizing zone 102 by the heat source 2 to 840 ℃, and continuing for 1-1.2 h; stopping the heat source 2, lowering the workpiece to the isothermal zone 101 in the furnace body 1 again, opening a ventilation opening at the bottom of the heat source 2 connected with the cooling pool 3, spraying cooling oil mist by using a fan and a spraying device at the isothermal zone 101, performing air cooling for 0.3h, performing mist cooling for 0.1h, and lowering the temperature to 220 ℃.
Specifically, in step S1, the heat source 2 is heated by an electric furnace having a ring shape.
Specifically, in step S1, the temperature is raised at a rate of 50 ℃/min during the heating to 925 ℃.
Specifically, in step S2, the oil mist particles of the quenching oil ejected from the spray device are 25 to 50 μm.
Specifically, in step S2, the quenching oil is prepared from, by weight, 75-80 parts of 150N type II base oil, 4-9 parts of octylphenol polyoxyethylene ether, 20-28 parts of palm wax, 10-16 parts of 52% chlorinated paraffin, 1-2 parts of poly- α -olefin, 30-35 parts of epoxidized castor oil, 0.5-2 parts of potassium molybdate, 0.5-2 parts of propylene oxide and 4-16 parts of a modified antioxidant.
Specifically, in step S3, the workpiece is cooled by a bottom-up gas supply method at a cooling rate of 20 ℃/min.
Specifically, in step S5, the diameter of the cooling oil mist sprayed from the spraying device is 30 to 50 microns.
The carburizing and quenching composite heat treatment production line carries out heat treatment by utilizing the equipment in the scheme.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The processing method of carburizing and quenching composite heat treatment is characterized by comprising the following steps: 1. the processing method of carburizing and quenching composite heat treatment is characterized by comprising the following steps: the method comprises the following steps:
s1, placing the workpiece in a furnace body (1), and heating the carburizing zone (102) of the furnace body (1) to 92525 ℃ through a heat source (2);
step S2, spraying fog-shaped quenching oil through a spraying device in the carburizing zone (102), and continuously spraying for 1.2-1.5 h;
step S3, stopping heat supply of the heat source (2), lowering the workpiece to an isothermal zone (101) in the furnace body (1), opening a ventilation opening connecting the bottom of the heat source (2) and the cooling pool (3), and lowering the temperature to 61010 ℃ by adopting air cooling heat dissipation for 1-1.2 hours;
s4, closing a vent connected with the bottom of the heat source (2) and the cooling pool (3), lifting the workpiece to a carburizing zone (102) in the furnace body (1), heating the carburizing zone (102) through the heat source (2) to 84010 ℃, and continuing for 1-1.2 hours;
and S5, stopping the heat source (2), cooling the workpiece to the isothermal zone (101) in the furnace body (1), opening a ventilation opening connecting the bottom of the heat source (2) and the cooling pool (3), spraying cooling oil mist by using a fan and a spraying device at the isothermal zone (101) for air cooling for 0.3h, then performing mist cooling for 0.1h, and cooling to 22010 ℃.
2. The carburizing and quenching composite heat treatment processing method according to claim 1, characterized in that: in step S1, the heat source (2) is heated by a ring-shaped coal stove or an electric stove.
3. The carburizing and quenching composite heat treatment processing method according to claim 1, characterized in that: in step S1, the temperature is raised at a rate of 50 ℃/min during heating to 92525 ℃.
4. The carburizing and quenching composite heat treatment processing method according to claim 2, characterized in that: in step S2, the oil mist particles of the quenching oil sprayed by the spray device are 25 to 50 microns.
5. The carburizing and quenching composite heat treatment method according to claim 1, wherein in step S2, the quenching oil is prepared from, by weight, 75-80 parts of 150N type II base oil, 4-9 parts of octylphenol polyoxyethylene ether, 20-28 parts of palm wax, 10-16 parts of 52% chlorinated paraffin, 1-2 parts of poly- α -olefin, 30-35 parts of epoxidized castor oil, 0.5-2 parts of potassium molybdate, 0.5-2 parts of propylene oxide, and 4-16 parts of modified antioxidant.
6. The carburizing and quenching composite heat treatment processing method according to claim 1, characterized in that: in step S3, the workpiece is cooled by a bottom-up gas supply method at a cooling rate of 20 ℃/min.
7. The carburizing and quenching composite heat treatment processing method according to claim 4, characterized in that: in step S5, the diameter of the cooling oil mist sprayed from the spraying device is 30 to 50 microns.
8. The carburizing and quenching composite heat treatment production line is characterized in that: an apparatus comprising the carburizing and quenching composite heat treatment process according to claim 7.
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| CN1075985A (en) * | 1992-11-26 | 1993-09-08 | 冶金工业部重庆钢铁设计研究院 | Heat treatment method for steel rail and device |
| CN101260505A (en) * | 2007-03-09 | 2008-09-10 | 株式会社Ihi | Vacuum carburization method and vacuum carburization apparatus |
| CN103132086A (en) * | 2013-03-18 | 2013-06-05 | 上海市机械制造工艺研究所有限公司 | Novel carburizing-constant temperature-quenching process for heavy-duty gears |
| CN104673980A (en) * | 2015-03-18 | 2015-06-03 | 苏州明志科技有限公司 | Quenching device for thermal aluminum alloy treatment |
| CN105937017A (en) * | 2016-06-27 | 2016-09-14 | 浙江宇清热工科技股份有限公司 | Continuous vacuum heat treatment furnace |
| CN105950842A (en) * | 2016-04-28 | 2016-09-21 | 昌利锻造有限公司 | Quenching oil for bearing end caps |
| CN107245690A (en) * | 2017-06-23 | 2017-10-13 | 江苏丰东热处理及表面改性工程技术研究有限公司 | A kind of carburizing quenching process |
-
2019
- 2019-12-20 CN CN201911330155.0A patent/CN110923619A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075985A (en) * | 1992-11-26 | 1993-09-08 | 冶金工业部重庆钢铁设计研究院 | Heat treatment method for steel rail and device |
| CN101260505A (en) * | 2007-03-09 | 2008-09-10 | 株式会社Ihi | Vacuum carburization method and vacuum carburization apparatus |
| CN103132086A (en) * | 2013-03-18 | 2013-06-05 | 上海市机械制造工艺研究所有限公司 | Novel carburizing-constant temperature-quenching process for heavy-duty gears |
| CN104673980A (en) * | 2015-03-18 | 2015-06-03 | 苏州明志科技有限公司 | Quenching device for thermal aluminum alloy treatment |
| CN105950842A (en) * | 2016-04-28 | 2016-09-21 | 昌利锻造有限公司 | Quenching oil for bearing end caps |
| CN105937017A (en) * | 2016-06-27 | 2016-09-14 | 浙江宇清热工科技股份有限公司 | Continuous vacuum heat treatment furnace |
| CN107245690A (en) * | 2017-06-23 | 2017-10-13 | 江苏丰东热处理及表面改性工程技术研究有限公司 | A kind of carburizing quenching process |
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Application publication date: 20200327 |