CN104313282A - Pull bar thermal treatment method - Google Patents
Pull bar thermal treatment method Download PDFInfo
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- CN104313282A CN104313282A CN201410439648.9A CN201410439648A CN104313282A CN 104313282 A CN104313282 A CN 104313282A CN 201410439648 A CN201410439648 A CN 201410439648A CN 104313282 A CN104313282 A CN 104313282A
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- pull bar
- quenching
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- pull
- process furnace
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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
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- 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
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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 Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
The invention discloses a pull bar thermal treatment method. The method comprises three steps: a normalizing treatment, a quenching treatment, and a tempering treatment. The heating temperature in the normalizing treatment is 840 to 870 DEG C and the heating time is 45 to 60 minutes. The temperature of the heating furnace is 800 to 900 DEG C in the quenching treatment, and the last heating time is 50 to 55 minutes. The temperature maintaining time in the tempering treatment is 150 to 180 minutes, and the temperature range in the tempering treatment is 540 to 550 DEG C. The processed pull bar has a strong pull resistant performance, at the same time the surface is resistant to abrasion, and the pull bar is safe and reliable.
Description
Technical field
The present invention relates to a kind of pull bar heat treating method.
Background technology
Pull bar mainly bears the pulling force in two axle head directions, and existing pull bar is mostly one-step casting and forms, and then after simple process, is just used, and therefore the overall resistance to tension of pull bar that obtains of this kind of mode is poor, therefore comparatively impracticable.
The method of this pull bar obtained is comparatively simple and crude simultaneously, cannot give full play of the concrete effect of pull bar material, material is wasted.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of pull bar heat treating method, and the pull bar after processed by the present invention has stronger resistance to tension, and surface abrasion resistance is better simultaneously, safe and reliable.
For solving the problem, the present invention adopts following technical scheme:
A kind of pull bar heat treating method, comprises the following steps:
1) normalizing treatment: pull bar is put into process furnace, when putting, often prop up the space leaving 1cm ~ 5cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment is less than 40, starts heating, Heating temperature 840 DEG C ~ 870 DEG C after having put, heat-up time 45min ~ 60min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature;
2) quench treatment: when first the process furnace of sky being warming up to 600 DEG C-700 DEG C, then pull bar is put, when putting, often prop up the space leaving 1cm ~ 5cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment is less than 40, process furnace is warming up to 800 DEG C ~ 900 DEG C after having put, keep 50min ~ 55min heat-up time, when quenching, liquid of quenching should circulate, make even concentration, sodium hydroxide (NaOH) concentration remains on 30%, quenching liquid temp can not more than 60 DEG C, during quenching require by pull bar in stove one one push liquid pool of quenching, ensure that pull bar submerges liquid of quenching completely, place 8min ~ 12min quenching in liquid pool, pull bar after quenching, handle with care when moving, collision free impacts, hardness after quenching should be HRC60-63, every stove sampling observation hardness >=2,
3) temper: by step 2) the middle qualified pull bar that quenches is by two stoves during quenching and a stove hangs on workpiece bucket, the gap of 1cm ~ 5cm is separated between each pull bar, finally pull bar is put in pit furnace, the pull bar quantity of every stove is less than 80, pull bar tempering insulation time 150min ~ 180min, tempering holding temperature 540 DEG C-550 DEG C, take out from pit furnace after being incubated, then below air cooling to 400 DEG C, then carry out water-cooled again, until be cooled to normal temperature, tempering back stay hardness HRC38-43 (entirely examine there being hole end surface by square pull bar, other end and intermediate surface inspect more than 4 by random samples, circle pull bar is examined entirely at cylinder end face, intermediate surface inspects more than 4 by random samples),
4) machine, step 2) should 8h be less than to process period of step 3).
As preferred technical scheme, the material of described pull bar is 60Si2Mn.
As preferred technical scheme, in described step 1), pull bar is put into process furnace, when putting, often prop up the space leaving 3cm between pull bar, do not allow touching between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 38, heating is started after having put, Heating temperature 870 DEG C, heat-up time 55min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature.
As preferred technical scheme, in described step 1), pull bar is put into process furnace, when putting, often prop up the space leaving 4cm between pull bar, do not allow touching between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 36, heating is started after having put, Heating temperature 850 DEG C, heat-up time 60min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature.
As preferred technical scheme, described step 2) in when first the process furnace of sky being warming up to 650 DEG C, then pull bar is put, when putting, often prop up the space leaving 3cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 37, after having put, process furnace is warming up to 900 DEG C, keep 52min heat-up time, when quenching, liquid of quenching should circulate, make even concentration, sodium hydroxide (NaOH) concentration remains on 30%, to quench liquid temp 45 DEG C, during quenching require by pull bar in stove one one push liquid pool of quenching, ensure that pull bar submerges liquid of quenching completely, place 12min quenching in liquid pool, pull bar after quenching, handle with care when moving, collision free impacts, hardness after quenching should be HRC60-63, every stove sampling observation hardness 5.
As preferred technical scheme, described step 2) the middle qualified pull bar that quenches is by two stoves during quenching and a stove hangs on workpiece bucket, and separate the gap of 4cm between each pull bar, finally pull bar is put in pit furnace, the pull bar quantity of every stove 78, pull bar tempering insulation time 180min, tempering holding temperature 550 DEG C, takes out after being incubated from pit furnace, then air cooling to 350 DEG C, then carry out water-cooled again, until be cooled to normal temperature, tempering back stay hardness HRC38-43.
The invention has the beneficial effects as follows: the pull bar after processed by the present invention has stronger resistance to tension, surface abrasion resistance is better simultaneously, safe and reliable.
Embodiment
Below the preferred embodiments of the present invention are described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
A kind of pull bar heat treating method.Comprise the following steps:
1) normalizing treatment: pull bar is put into process furnace, when putting, often prop up the space leaving 1cm ~ 5cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment is less than 40, starts heating, Heating temperature 840 DEG C ~ 870 DEG C after having put, heat-up time 45min ~ 60min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature;
2) quench treatment: when first the process furnace of sky being warming up to 600 DEG C-700 DEG C, then pull bar is put, when putting, often prop up the space leaving 1cm ~ 5cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment is less than 40, process furnace is warming up to 800 DEG C ~ 900 DEG C after having put, keep 50min ~ 55min heat-up time, when quenching, liquid of quenching should circulate, make even concentration, sodium hydroxide (NaOH) concentration remains on 30%, quenching liquid temp can not more than 60 DEG C, during quenching require by pull bar in stove one one push liquid pool of quenching, ensure that pull bar submerges liquid of quenching completely, place 8min ~ 12min quenching in liquid pool, pull bar after quenching, handle with care when moving, collision free impacts, hardness after quenching should be HRC60-63, every stove sampling observation hardness >=2,
3) temper: by step 2) the middle qualified pull bar that quenches is by two stoves during quenching and a stove hangs on workpiece bucket, the gap of 1cm ~ 5cm is separated between each pull bar, finally pull bar is put in pit furnace, the pull bar quantity of every stove is less than 80, pull bar tempering insulation time 150min ~ 180min, tempering holding temperature 540 DEG C-550 DEG C, take out from pit furnace after being incubated, then below air cooling to 400 DEG C, then carry out water-cooled again, until be cooled to normal temperature, tempering back stay hardness HRC38-43 (entirely examine there being hole end surface by square pull bar, other end and intermediate surface inspect more than 4 by random samples, circle pull bar is examined entirely at cylinder end face, intermediate surface inspects more than 4 by random samples),
4) machine, step 2) should 8h be less than to process period of step 3).
The material of described pull bar is 60Si2Mn.
In described step 1), pull bar is put into process furnace, when putting, often prop up the space leaving 3cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 38, starts heating, Heating temperature 870 DEG C after having put, heat-up time 55min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature.
In described step 1), pull bar is put into process furnace, when putting, often prop up the space leaving 4cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 36, starts heating, Heating temperature 850 DEG C after having put, heat-up time 60min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature.
Described step 2) in when first the process furnace of sky being warming up to 650 DEG C, then pull bar is put, when putting, often prop up the space leaving 3cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 37, after having put, process furnace is warming up to 900 DEG C, keep 52min heat-up time, when quenching, liquid of quenching should circulate, make even concentration, sodium hydroxide (NaOH) concentration remains on 30%, to quench liquid temp 45 DEG C, during quenching require by pull bar in stove one one push liquid pool of quenching, ensure that pull bar submerges liquid of quenching completely, place 12min quenching in liquid pool, pull bar after quenching, handle with care when moving, collision free impacts, hardness after quenching should be HRC60-63, every stove sampling observation hardness 5.
Described step 2) the middle qualified pull bar that quenches is by two stoves during quenching and a stove hangs on workpiece bucket, the gap of 4cm is separated between each pull bar, finally pull bar is put in pit furnace, the pull bar quantity of every stove 78, pull bar tempering insulation time 180min, tempering holding temperature 550 DEG C, take out from pit furnace after being incubated, then air cooling to 350 DEG C, then carry out water-cooled again, until be cooled to normal temperature, tempering back stay hardness HRC38-43.
The invention has the beneficial effects as follows: the pull bar after processed by the present invention has stronger resistance to tension, surface abrasion resistance is better simultaneously, safe and reliable.
Embodiment 1
1) normalizing treatment: pull bar is put into process furnace, when putting, often prop up the space leaving 5cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 39, starts heating, Heating temperature 860 DEG C after having put, 55min during heating, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature;
2) quench treatment: when first the process furnace of sky being warming up to 700 DEG C, then pull bar is put, when putting, often prop up the space leaving 5cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 38, after having put, process furnace is warming up to 900 DEG C, keep 55min heat-up time, when quenching, liquid of quenching should circulate, make even concentration, sodium hydroxide (NaOH) concentration remains on 30%, to quench liquid temp 50 DEG C, during quenching require by pull bar in stove one one push liquid pool of quenching, ensure that pull bar submerges liquid of quenching completely, place 12min quenching in liquid pool, pull bar after quenching, handle with care when moving, collision free impacts, hardness after quenching should be HRC60-63, every stove sampling observation hardness 8,
3) temper: by step 2) the middle qualified pull bar that quenches is by two stoves during quenching and a stove hangs on workpiece bucket, the gap of 4cm is separated between each pull bar, finally pull bar is put in pit furnace, the pull bar quantity of every stove 79, pull bar tempering insulation time 180min, tempering holding temperature 550 DEG C, take out from pit furnace after being incubated, then air cooling to 300 DEG C, then carry out water-cooled again, until be cooled to normal temperature, tempering back stay hardness HRC38-43 (entirely examine there being hole end surface by square pull bar, other end and intermediate surface inspect more than 4 by random samples, circle pull bar is examined entirely at cylinder end face, intermediate surface inspects more than 4 by random samples),
4) machine.
Pull bar after processed by the present invention after tested has stronger resistance to tension, and surface abrasion resistance is better simultaneously, safe and reliable.
Embodiment 2
1) normalizing treatment: pull bar is put into process furnace, when putting, often prop up the space leaving 3cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 36, starts heating, Heating temperature 840 DEG C after having put, heat-up time 50min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature;
2) quench treatment: when first the process furnace of sky being warming up to 680 DEG C, then pull bar is put, when putting, often prop up the space leaving 5cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 36, after having put, process furnace is warming up to 850 DEG C, keep 53min heat-up time, when quenching, liquid of quenching should circulate, make even concentration, sodium hydroxide (NaOH) concentration remains on 30%, to quench liquid temp 45, during quenching require by pull bar in stove one one push liquid pool of quenching, ensure that pull bar submerges liquid of quenching completely, place 11min quenching in liquid pool, pull bar after quenching, handle with care when moving, collision free impacts, hardness after quenching should be HRC60-63, every stove sampling observation hardness 7,
3) temper: by step 2) the middle qualified pull bar that quenches is by two stoves during quenching and a stove hangs on workpiece bucket, the gap of 3cm is separated between each pull bar, finally pull bar is put in pit furnace, the pull bar quantity of every stove 72, pull bar tempering insulation time 180min, tempering holding temperature 540 DEG C, take out from pit furnace after being incubated, then air cooling to 250, then carry out water-cooled again, until be cooled to normal temperature, tempering back stay hardness HRC38-43 (entirely examine there being hole end surface by square pull bar, other end and intermediate surface inspect more than 4 by random samples, circle pull bar is examined entirely at cylinder end face, intermediate surface inspects more than 4 by random samples),
4) machine.
Pull bar after processed by the present invention after tested has stronger resistance to tension, and surface abrasion resistance is better simultaneously, safe and reliable.
The above, be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any change of expecting without creative work or replacement, all should be encompassed within protection scope of the present invention.Therefore, the protection domain that protection scope of the present invention should limit with claims is as the criterion.
Claims (6)
1. a pull bar heat treating method, is characterized in that, comprises the following steps:
1) normalizing treatment: pull bar is put into process furnace, when putting, often prop up the space leaving 1cm ~ 5cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment is less than 40, starts heating, Heating temperature 840 DEG C ~ 870 DEG C after having put, heat-up time 45min ~ 60min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature;
2) quench treatment: when first the process furnace of sky being warming up to 600 DEG C-700 DEG C, then pull bar is put, when putting, often prop up the space leaving 1cm ~ 5cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment is less than 40, process furnace is warming up to 800 DEG C ~ 900 DEG C after having put, keep 50min ~ 55min heat-up time, when quenching, liquid of quenching should circulate, make even concentration, sodium hydroxide (NaOH) concentration remains on 30%, quenching liquid temp can not more than 60 DEG C, during quenching require by pull bar in stove one one push liquid pool of quenching, ensure that pull bar submerges liquid of quenching completely, place 8min ~ 12min quenching in liquid pool, pull bar after quenching, handle with care when moving, collision free impacts, hardness after quenching should be HRC60-63, every stove sampling observation hardness >=2,
3) temper: by step 2) the middle qualified pull bar that quenches is by two stoves during quenching and a stove hangs on workpiece bucket, the gap of 1cm ~ 5cm is separated between each pull bar, finally pull bar is put in pit furnace, the pull bar quantity of every stove is less than 80, pull bar tempering insulation time 150min ~ 180min, tempering holding temperature 540 DEG C-550 DEG C, take out from pit furnace after being incubated, then below air cooling to 400 DEG C, then carry out water-cooled again, until be cooled to normal temperature, tempering back stay hardness HRC38-43 (entirely examine there being hole end surface by square pull bar, other end and intermediate surface inspect more than 4 by random samples, circle pull bar is examined entirely at cylinder end face, intermediate surface inspects more than 4 by random samples),
4) machine, step 2) should 8h be less than to process period of step 3).
2. pull bar heat treating method according to claim 1, is characterized in that: the material of described pull bar is 60Si2Mn.
3. pull bar heat treating method according to claim 1, it is characterized in that: in described step 1), pull bar is put into process furnace, when putting, often prop up the space leaving 3cm between pull bar, do not allow touching between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 38, heating is started after having put, Heating temperature 870 DEG C, heat-up time 55min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature.
4. pull bar heat treating method according to claim 1, it is characterized in that: in described step 1), pull bar is put into process furnace, when putting, often prop up the space leaving 4cm between pull bar, do not allow touching between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 36, heating is started after having put, Heating temperature 850 DEG C, heat-up time 60min, after having heated, pull bar is taken out from process furnace and air cooling to normal temperature.
5. pull bar heat treating method according to claim 1, it is characterized in that: described step 2) in when first the process furnace of sky being warming up to 650 DEG C, then pull bar is put, when putting, often prop up the space leaving 3cm between pull bar, touching is not allowed between two adjacent pull bars, the pull bar quantity of every stove normalizing treatment 37, after having put, process furnace is warming up to 900 DEG C, keep 52min heat-up time, when quenching, liquid of quenching should circulate, make even concentration, sodium hydroxide (NaOH) concentration remains on 30%, to quench liquid temp 45 DEG C, during quenching require by pull bar in stove one one push liquid pool of quenching, ensure that pull bar submerges liquid of quenching completely, place 12min quenching in liquid pool, pull bar after quenching, handle with care when moving, collision free impacts, hardness after quenching should be HRC60-63, every stove sampling observation hardness 5.
6. pull bar heat treating method according to claim 1, it is characterized in that: described step 2) the middle qualified pull bar that quenches is by two stoves during quenching and a stove hangs on workpiece bucket, the gap of 4cm is separated between each pull bar, finally pull bar is put in pit furnace, the pull bar quantity of every stove 78, pull bar tempering insulation time 180min, tempering holding temperature 550 DEG C, take out from pit furnace after being incubated, then air cooling to 350 DEG C, then carry out water-cooled again, until be cooled to normal temperature, tempering back stay hardness HRC38-43.
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| CN201410439648.9A CN104313282B (en) | 2014-09-01 | 2014-09-01 | A kind of pull bar heat treatment method |
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| CN201410439648.9A CN104313282B (en) | 2014-09-01 | 2014-09-01 | A kind of pull bar heat treatment method |
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| CN104313282A true CN104313282A (en) | 2015-01-28 |
| CN104313282B CN104313282B (en) | 2016-05-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112391511A (en) * | 2020-09-18 | 2021-02-23 | 湖北神力汽车零部件股份有限公司 | Thermal treatment hardening and tempering method for automobile half shaft |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1536095A (en) * | 2003-04-04 | 2004-10-13 | 巨力集团有限公司 | High-strength steel pipe pull-rod |
| CN103014253A (en) * | 2012-11-29 | 2013-04-03 | 浙江吉利汽车研究院有限公司杭州分公司 | Thermal treatment method of 60Si2Mn steel subjected to friction welding |
| CN103643149A (en) * | 2013-12-19 | 2014-03-19 | 马钢(集团)控股有限公司 | Hot rolled round steel for large-size vanadium steel draw bar with 650MPa-level yield strength and heat treatment technology thereof |
-
2014
- 2014-09-01 CN CN201410439648.9A patent/CN104313282B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1536095A (en) * | 2003-04-04 | 2004-10-13 | 巨力集团有限公司 | High-strength steel pipe pull-rod |
| CN103014253A (en) * | 2012-11-29 | 2013-04-03 | 浙江吉利汽车研究院有限公司杭州分公司 | Thermal treatment method of 60Si2Mn steel subjected to friction welding |
| CN103643149A (en) * | 2013-12-19 | 2014-03-19 | 马钢(集团)控股有限公司 | Hot rolled round steel for large-size vanadium steel draw bar with 650MPa-level yield strength and heat treatment technology thereof |
Non-Patent Citations (1)
| Title |
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| 赖辉等: ""多节刚性拉杆制造工艺研究"", 《热处理》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112391511A (en) * | 2020-09-18 | 2021-02-23 | 湖北神力汽车零部件股份有限公司 | Thermal treatment hardening and tempering method for automobile half shaft |
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