CN109022740A - A kind of creeper tread heat treatment method - Google Patents
A kind of creeper tread heat treatment method Download PDFInfo
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- CN109022740A CN109022740A CN201810805642.7A CN201810805642A CN109022740A CN 109022740 A CN109022740 A CN 109022740A CN 201810805642 A CN201810805642 A CN 201810805642A CN 109022740 A CN109022740 A CN 109022740A
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- creeper tread
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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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- 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
-
- 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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention belongs to creeper tread processing technology field, in particular to a kind of creeper tread heat treatment method, including die forging, first heat treatment, first shot-peening, surface modification, secondary heat treatment, quenching add-back fire and secondary shot-peening.By way of the present invention is passed through the media such as coal gas, drop kerosene when high-temperature heating or uses vacuum drying oven, increase furnace gas carbon content, extend high-temperature holding time simultaneously, it is quenched tempering again, surface more high rigidity, whole more high tenacity and best bending drag and the creeper tread for more rushing flexural fatigue drag can be obtained, improve wear-resisting property, center portion carbon equivalent is constant simultaneously, skin decarburization is avoided, product service life is greatly improved, application prospect is wider.
Description
Technical field
The invention belongs to creeper tread processing technology fields, relate in particular to a kind of creeper tread heat treatment method.
Background technique
Mine can absorb impact simultaneously, reverse, being bent, by force with CrNiMo structural steel creeper tread in mining work at present
Iso-stress is pressed, is easily damaged, main failure forms are abrasion, chip off-falling, shallow peel etc..And existing creeper tread is processed
Cheng Zhong is heated when Tempering and Quenching under normal furnace gas atmosphere, is quenched, tempering, and the crawler belt plate surface after leading to heat treatment exists
Decarburization phenomenon.Carbon equivalent and center portion are quite lower than 0.37%C to decarburized layer inward, and surface hardness is also below Brinell hardness HB370.Cloth
Family name's hardness (HB) refers to the steel ball pressure of hardening with certain load (general 3000kg) a certain size (diameter is generally 10mm)
Enter material surface, kept for a period of time, after unloading, the ratio of load and its area of indentation, unit for Kgf/mm2(N/mm2)。
Summary of the invention
For various deficiencies of the prior art, inventor's researching and designing in long-term practice goes out a kind of creeper tread heat treatment side
Method improves wear-resisting property, avoids skin decarburization, greatly improves product service life.
To achieve the above object, the invention provides the following technical scheme: a kind of creeper tread heat treatment method, including following step
It is rapid:
S1, die forging；
S2, first heat treatment；
S3, first shot-peening；
S4, surface are modified: after temperature is heated to 880~900 DEG C, toward heat-treatment furnace in be passed through coal gas or instillation kerosene,
So that the phosphorus content for being heat-treated furnace gas is maintained at 0.6%~0.7%, places into creeper tread；Or
After the temperature of vacuum drying oven is heated to 880~900 DEG C, creeper tread is put into vacuum drying oven；
S5, secondary heat treatment；
S6, quenching add-back fire；
S7, secondary shot-peening.
Further, creeper tread to be processed is subjected to first pressing with 4000 tons of hydraulic presses or 4000 tons of hydraulic presses in step S1
Molding.
Further, first heat treatment described in step S2 includes first time normalizing and is tempered for the first time.
Further, the first time normalizing is that creeper tread is put into heat-treatment furnace, is protected after being heated to 940~960 DEG C
Temperature when creeper tread is with a thickness of 1 inch, keeps the temperature half an hour, and thickness is every to increase by 1 inch, and soaking time increases half an hour.
Further, the first time tempering is taken out for the creeper tread after heating, and is cooled to 500~650 in air
It is kept the temperature after DEG C, when creeper tread is with a thickness of 1 inch, keeps the temperature half an hour, thickness is every to increase by 1 inch, and soaking time increases half an hour.
Further, sand or shot are sprayed to crawler belt plate surface with compressed air shotblasting machine or sand-blasting machine in step S3, removed just
The metal oxide skin generated under fiery stage high temperature.
Further, secondary heat treatment described in step S5 includes that second of normalizing and second are tempered.
Further, second of normalizing is that modified crawler belt plate temperature is reduced to 850~870 DEG C, heat preservation 1~
2h comes out of the stove and naturally cools to 300 DEG C or less in air；Second of tempering is that creeper tread after cooling is heated to 540~560
DEG C, keep the temperature 2h.
Further, in step S6, the quenching keeps the temperature 2h, then for the creeper tread after tempering is first heated to 860 DEG C
Lift after creeper tread integrally to be entered to quenching liquid quenching, promotes plate body fast precooling；The tempering is to add quenched creeper tread
Heat keeps the temperature 2h to 450~480 DEG C.
Further, secondary shot-peening described in step S7 is by the creeper tread compressed air shotblasting machine or sand-blasting machine after step S6 tempering
Shot-peening removes creeper tread surface scale.
The beneficial effects of the present invention are:
By way of being passed through the media such as coal gas, drop kerosene when high-temperature heating or using vacuum drying oven, increase furnace gas carbon content,
Extend high-temperature holding time simultaneously, then be quenched tempering, surface more high rigidity, whole more high tenacity and most preferably curved can be obtained
Qu Kangli and the creeper tread for more rushing flexural fatigue drag improve wear-resisting property, while center portion carbon equivalent is constant, avoids surface
Decarburization, greatly improves product service life, and application prospect is wider.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, below with reference to preferred embodiment to this
Invention is described further.
Embodiment 1:
A kind of creeper tread heat treatment method, the specific steps are as follows:
S1, die forging: molded at the beginning of being carried out creeper tread to be processed with hydraulic press, the present embodiment uses 4000 tons of hydraulic pressure
Machine carries out.
S2, first time normalizing: creeper tread is put into heat-treatment furnace, is heated to 940 DEG C, when creeper tread is with a thickness of 1 inch,
Half an hour is kept the temperature, thickness is every to increase by 1 inch, and soaking time increases half an hour.By high temperature forging, the forging for eliminating creeper tread is answered
Power.
S3, it is tempered for the first time: the creeper tread after heating being taken out, is cooled to 500 DEG C in air, creeper tread is with a thickness of 1
When inch, half an hour is kept the temperature, thickness is every to increase by 1 inch, and soaking time increases half an hour.By high tempering, assist normalizing after
The continuous forging stress for eliminating creeper tread, while creeper tread surface texture can also be made more careful, more well-balanced, obtain refinement matrix group
It knits.
S4, first time shot-peening: sand is sprayed to crawler belt plate surface high speed and high pressure with sand-blasting machine, removal is in normalizing stage height
The lower metal oxide skin generated of temperature.
S5, surface are modified: after temperature of heat treatment furnace is heated to 880 DEG C, being passed through coal gas toward heat-treatment furnace, make heat-treatment furnace
The phosphorus content of interior gas is maintained at 0.6%~0.7%, places into creeper tread, and the certain layer depth of crawler belt plate surface can in this way obtained
Carbon equivalent high tissue, carbon content are not less than 0.4%.
S6, second of normalizing: being reduced to 850 DEG C for modified crawler belt plate temperature, keep the temperature 1h, comes out of the stove natural in air
It is cooled to 300 DEG C or less.
S7, it is tempered for second: will be cooled to 300 DEG C of creeper treads below and be heated to 540 DEG C, keep the temperature 2h.Pass through second
Normalizing adds second of tempering, can refine the grain structure of creeper tread and eliminate the net carbide in creeper tread, obtain more
The matrix of refinement.The creeper tread grain size that the present embodiment is made, according to " austenite grain GB6394-2002 metal
The grading of mean grain size standard ", 5 grades or more can be reached.
S8, quenching: the creeper tread after tempering is heated to 860 DEG C, 2h is kept the temperature, creeper tread is integrally then entered to quenching liquid and is quenched
Lift after fire, promotes plate body fast precooling.
S9, third time are tempered: the creeper tread for being down to room temperature after quenching being heated to 450 DEG C, keeps the temperature 2h.By quenching and the
After being tempered three times, creeper tread can obtain the comprehensive mechanical performances such as higher surface layer Brinell hardness (HB), better matrix toughness.
S10, second of shot-peening: sand is sprayed to crawler belt plate surface high speed and high pressure with sand-blasting machine, is removed in above-mentioned high temperature
The metal oxide skin generated under heating period, while improving the contact fatigue strength of creeper tread.
Embodiment 2:
A kind of creeper tread heat treatment method, the specific steps are as follows:
S1, die forging: molded at the beginning of being carried out creeper tread to be processed with hydraulic press, the present embodiment uses 4000 tons of oil pressure
Machine carries out.
S2, first time normalizing: creeper tread is put into heat-treatment furnace, is heated to 950 DEG C, when creeper tread is with a thickness of 1 inch,
Half an hour is kept the temperature, thickness is every to increase by 1 inch, and soaking time increases half an hour.By high temperature forging, the forging for eliminating creeper tread is answered
Power.
S3, it is tempered for the first time: the creeper tread after heating being taken out, is cooled to 580 DEG C in air, creeper tread is with a thickness of 1
When inch, half an hour is kept the temperature, thickness is every to increase by 1 inch, and soaking time increases half an hour.By high tempering, assist normalizing after
The continuous forging stress for eliminating creeper tread, while creeper tread surface texture can also be made more careful, more well-balanced, obtain refinement matrix group
It knits.
S4, first time shot-peening: shot is sprayed to crawler belt plate surface high speed and high pressure with compressed air shotblasting machine, removal is in normalizing stage height
The lower metal oxide skin generated of temperature.
S5, surface are modified: after temperature of heat treatment furnace is heated to 890 DEG C, instilling kerosene toward heat-treatment furnace, make heat-treatment furnace
The phosphorus content of interior gas is maintained at 0.6%~0.7%, places into creeper tread, and the certain layer depth of crawler belt plate surface can in this way obtained
Carbon equivalent high tissue, carbon content are not less than 0.4%.
S6, second of normalizing: being reduced to 860 DEG C for modified crawler belt plate temperature, keep the temperature 1.5h, comes out of the stove in air certainly
So it is cooled to 300 DEG C or less
S7, it is tempered for second: will be cooled to 300 DEG C of creeper treads below and be heated to 550 DEG C, keep the temperature 2h.Pass through second
Normalizing adds second of tempering, can refine the grain structure of creeper tread and eliminate the net carbide in creeper tread, obtain more
The matrix of refinement.The creeper tread grain size that the present embodiment is made, according to " austenite grain GB6394-2002 metal
The grading of mean grain size standard ", 5 grades or more can be reached.
S8, quenching: the creeper tread after tempering is heated to 860 DEG C, 2h is kept the temperature, creeper tread is integrally then entered to quenching liquid and is quenched
Lift after fire, promotes plate body fast precooling.
S9, third time are tempered: the creeper tread for being down to room temperature after quenching being heated to 465 DEG C, keeps the temperature 2h.By quenching and the
After being tempered three times, creeper tread can obtain the comprehensive mechanical performances such as higher surface layer Brinell hardness (HB), better matrix toughness.
S10, second of shot-peening: shot is sprayed to crawler belt plate surface high speed and high pressure with compressed air shotblasting machine, is removed in above-mentioned high temperature
The metal oxide skin generated under heating period, while improving the contact fatigue strength of creeper tread.
Embodiment 3:
A kind of creeper tread heat treatment method, the specific steps are as follows:
S1, die forging: molded at the beginning of being carried out creeper tread to be processed with hydraulic press, the present embodiment uses 4000 tons of hydraulic pressure
Machine carries out.
S2, first time normalizing: creeper tread is put into heat-treatment furnace, is heated to 960 DEG C, when creeper tread is with a thickness of 1 inch,
Half an hour is kept the temperature, thickness is every to increase by 1 inch, and soaking time increases half an hour.By high temperature forging, the forging for eliminating creeper tread is answered
Power.
S3, it is tempered for the first time: the creeper tread after heating being taken out, is cooled to 650 DEG C in air, creeper tread is with a thickness of 1
When inch, half an hour is kept the temperature, thickness is every to increase by 1 inch, and soaking time increases half an hour.By high tempering, assist normalizing after
The continuous forging stress for eliminating creeper tread, while creeper tread surface texture can also be made more careful, more well-balanced, obtain refinement matrix group
It knits.
S4, first time shot-peening: sand is sprayed to crawler belt plate surface high speed and high pressure with compressed air shotblasting machine, removal is in normalizing stage height
The lower metal oxide skin generated of temperature.
S5, surface are modified: using vacuum drying oven, after temperature is heated to 900 DEG C, protect the phosphorus content for being heat-treated furnace gas
It holds 0.6%~0.7%, places into creeper tread, the certain layer depth of crawler belt plate surface can be made to obtain carbon equivalent high tissue in this way, carbon contains
Amount is not less than 0.4%.
S6, second of normalizing: being reduced to 870 DEG C for modified crawler belt plate temperature, keep the temperature 2h, comes out of the stove natural in air
It is cooled to 300 DEG C or less.
S7, it is tempered for second: will be cooled to 300 DEG C of creeper treads below and be heated to 560 DEG C, keep the temperature 2h.Pass through second
Normalizing adds second of tempering, can refine the grain structure of creeper tread and eliminate the net carbide in creeper tread, obtain more
The matrix of refinement.The creeper tread grain size that the present embodiment is made, according to " austenite grain GB6394-2002 metal
The grading of mean grain size standard ", 5 grades or more can be reached.
S8, quenching: the creeper tread after tempering is heated to 860 DEG C, 2h is kept the temperature, creeper tread is integrally then entered to quenching liquid and is quenched
Lift after fire, promotes plate body fast precooling.
S9, third time are tempered: the creeper tread for being down to room temperature after quenching being heated to 480 DEG C, keeps the temperature 2h.By quenching and the
After being tempered three times, creeper tread can obtain the comprehensive mechanical performances such as higher surface layer Brinell hardness (HB), better matrix toughness.
S10, second of shot-peening: sand is sprayed to crawler belt plate surface high speed and high pressure with compressed air shotblasting machine, is removed in above-mentioned high temperature
The metal oxide skin generated under heating period, while improving the contact fatigue strength of creeper tread.
Creeper tread after being heat-treated according to above embodiments 1~3 has more in every mechanical performance than existing creeper tread
Excellent performance.Table 1 is the correlation data of the creeper tread and existing creeper tread items mechanical performance after the present embodiment 1~3 is heat-treated.
1 creeper tread items mechanical performance contrast table of table
To sum up, creeper tread heat treatment method of the invention is passed through the media such as coal gas, drop kerosene or makes when passing through high-temperature heating
With the mode of vacuum drying oven, increase furnace gas carbon content, while extending high-temperature holding time, then be quenched tempering, surface can be obtained
More high rigidity, whole more high tenacity and best bending drag and the creeper tread for more rushing flexural fatigue drag, improve wearability
Can, while center portion carbon equivalent is constant, avoids skin decarburization, greatly improves product service life, application prospect is wider.
Invention is described in detail above, it is described above, it is only a preferred embodiment of the present invention, when cannot limit
Determine the scope of the present invention, i.e., it is all according to the made equivalent changes and modifications of the application range, it should still belong in covering scope of the present invention.
Claims (10)
1. a kind of creeper tread heat treatment method, which comprises the following steps:
S1, die forging；
S2, first heat treatment；
S3, first shot-peening；
S4, surface are modified: after temperature is heated to 880~900 DEG C, toward heat-treatment furnace in be passed through coal gas or instillation kerosene, make heat
The phosphorus content of processing furnace gas is maintained at 0.6%~0.7%, places into creeper tread；Or
After the temperature of vacuum drying oven is heated to 880~900 DEG C, creeper tread is put into vacuum drying oven；
S5, secondary heat treatment；
S6, quenching add-back fire；
S7, secondary shot-peening.
2. a kind of creeper tread heat treatment method according to claim 1, which is characterized in that with 4000 tons of hydraulic pressure in step S1
Machine or 4000 tons of hydraulic presses carry out creeper tread to be processed just molded.
3. a kind of creeper tread heat treatment method according to claim 1, which is characterized in that first heat described in step S2
Processing includes first time normalizing and is tempered for the first time.
4. a kind of creeper tread heat treatment method according to claim 3, which is characterized in that the first time normalizing is that will carry out
Band plate is put into heat-treatment furnace, is kept the temperature after being heated to 940~960 DEG C, when creeper tread is with a thickness of 1 inch, keeps the temperature half an hour, thickness
Every to increase by 1 inch, soaking time increases half an hour.
5. a kind of creeper tread heat treatment method according to claim 3, which is characterized in that the first time tempering is that will add
Creeper tread after heat takes out, and keeps the temperature after being cooled to 500~650 DEG C in air, and when creeper tread is with a thickness of 1 inch, heat preservation half is small
When, thickness is every to increase by 1 inch, and soaking time increases half an hour.
6. a kind of creeper tread heat treatment method according to claim 1, which is characterized in that use compressed air shotblasting machine or spray in step S3
Sand machine sprays sand or shot to crawler belt plate surface, removes the metal oxide skin generated under normalizing stage high temperature.
7. a kind of creeper tread heat treatment method according to claim 1, which is characterized in that at second heat described in step S5
Reason includes that second of normalizing and second are tempered.
8. a kind of creeper tread heat treatment method according to claim 7, which is characterized in that second of normalizing is that will change
Property after crawler belt plate temperature be reduced to 850~870 DEG C, keep the temperature 1~2h, come out of the stove and naturally cool to 300 DEG C or less in air；The
Double tempering is that creeper tread after cooling is heated to 540~560 DEG C, keeps the temperature 2h.
9. a kind of creeper tread heat treatment method according to claim 1, which is characterized in that in step S6, the quenching is
The creeper tread after tempering is first heated to 860 DEG C, keeps the temperature 2h, lifts then creeper tread integrally to be entered to quenching liquid quenching after, promotes
Plate body fast precooling；The tempering keeps the temperature 2h for quenched creeper tread is heated to 450~480 DEG C.
10. a kind of creeper tread heat treatment method according to claim 1, which is characterized in that secondary spray described in step S7
Ball is that the creeper tread compressed air shotblasting machine or sand-blasting machine shot-peening after step S6 tempering are removed creeper tread surface scale.
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| CN201810805642.7A CN109022740A (en) | 2018-07-20 | 2018-07-20 | A kind of creeper tread heat treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110564941A (en) * | 2019-08-31 | 2019-12-13 | 南京视莱尔汽车电子有限公司 | Surface strengthening treatment method for production and processing of automobile part die |
| CN112756552A (en) * | 2020-12-31 | 2021-05-07 | 江苏人民机具有限公司 | Manufacturing process of crawler plate of crawler crane |
| CN114045442A (en) * | 2021-11-12 | 2022-02-15 | 北京北方车辆集团有限公司 | Heat treatment method of high-strength steel for track shoe |
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| CN112756552A (en) * | 2020-12-31 | 2021-05-07 | 江苏人民机具有限公司 | Manufacturing process of crawler plate of crawler crane |
| CN114045442A (en) * | 2021-11-12 | 2022-02-15 | 北京北方车辆集团有限公司 | Heat treatment method of high-strength steel for track shoe |
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Application publication date: 20181218 |