CN105671252A - One-time forging and pressing molding waste heat hardening and tempering technology for automobile front axle - Google Patents
One-time forging and pressing molding waste heat hardening and tempering technology for automobile front axle Download PDFInfo
- Publication number
- CN105671252A CN105671252A CN201610202402.9A CN201610202402A CN105671252A CN 105671252 A CN105671252 A CN 105671252A CN 201610202402 A CN201610202402 A CN 201610202402A CN 105671252 A CN105671252 A CN 105671252A
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- China
- Prior art keywords
- front axle
- automobile front
- forging
- temperature
- quenching
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Classifications
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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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
Abstract
The invention discloses a waste heat hardening and tempering technology for an automobile front axle forge piece. The waste heat hardening and tempering technology includes medium-frequency heating, roll forging machine die-pressing blank manufacturing, rough die forging, finish die forging, constant-temperature treatment, quenching, tempering and other processes. Hardenability can be obviously improved after forging and waste heat hardening and tempering, texture and hardness distribution is uniform, and the mechanical performance of a workpiece can be superior to that of a workpiece which is obtained after conventional hardening and tempering. The workpiece obtained after finish forging is subjected to short-time constant-temperature treatment, so that the temperature of the workpiece is uniform and constant when the workpiece is fed into quenching liquid, the performance stability is ensured, the quality is good, industrial production can be achieved, meanwhile, an extremely small amount of electric energy is consumed during short-time constant-temperature treatment, energy consumption is low, and the requirement of an energy-saving type society is met.
Description
Technical field
The invention belongs to technical field of heat treatment technology, be specifically related to a kind of forging forming waste heat hardening and tempering process of automobile front axle.
Background technology
In current existing front shaft forging of automobile hardening and tempering process, the normative heat treatment of forging is after forging is cooled to room temperature mostly, then by technological procedure by its heat treatment that post bake carries out again. It has drawbacks in that 1. owing to wanting post bake, and energy utilization rate is low; 2., owing to wanting post bake, the production cycle is long, and productivity ratio is low.
Summary of the invention
For Problems existing in background technology, the invention provides a kind of front shaft forging of automobile waste heat hardening and tempering process, including the operation such as heating in medium frequency, forging roll mold pressing base, blocking, essence die forging, constant temperature process, quenching and tempering, mainly for the heat direct quenching utilizing forging self after forging process for fuel, the waste heat of forging is made to be fully used.
Front shaft forging of automobile waste heat hardening and tempering machining process of the present invention is: forging shaft before heating in medium frequency rollforming die-forging forming (coarse-fine die forging) constant temperature process immediate quenching high tempering finished automotive.
Concrete technical scheme of the present invention is:
A kind of forging forming waste heat hardening and tempering process of automobile front axle, comprises the steps:
1) putting in intermediate frequency furnace by steel bar, heating in medium frequency, to 1150-1200 DEG C, adopts infrared thermometer temperature control;
2) at 1050-1100 DEG C, the bar after heating is sent into forging roll roll-in base, prepare automobile front axle blank;
3) automobile front axle blank is carried out blocking, control temperature and be 920-950 DEG C, make automobile front axle shape molding;
4) at 880-920 DEG C, carry out essence die forging, remove the oxide layer on automobile front axle outer burr and surface, make the concrete size of automobile front axle be consistent with design size;
5) being quickly delivered in constant temperature oven by automobile front axle, at 850-860 DEG C, constant temperature processes the 220-260 second, and the temperature making car surface is basically identical with the temperature of core;
6) automobile front axle after being processed by constant temperature is quickly sent in conveyer-type quench tank (in quenching tank, quenching liquid temperature is 10-35 DEG C) quenching 30-50 second;
7) automobile front axle after quenching is heated to 630-680 DEG C, temper 85-95 minute;
8) the qualified automobile front axle finished product forging that hardness is HRC45-48 is obtained.
The invention discloses a kind of front shaft forging of automobile waste heat hardening and tempering process, including the operation such as heating in medium frequency, forging roll mold pressing base, blocking, essence die forging, constant temperature process, quenching and tempering. The forged waste heat hardening and tempering of the present invention can significantly improve quenching degree, and tissue and hardness are evenly distributed, mechanical performance be better than conventional modified after workpiece; Workpiece after finish forge adopts constant temperature in short-term to process, and homogeneous temperature when making workpiece enter quenching liquid is consistent, it is ensured that stablizing of performance, good quality, it is possible to realize industrialized production, constant temperature processes and only consumes minimal amount of electric energy in short-term simultaneously, energy consumption is low, meets the requirement of conservation-minded society.
Forging forming waste heat hardening and tempering process of the present invention can omit normalizing and modified austenitizing reheats process, it it is an important Heat Treatment Energy Saving measure, namely the heat direct quenching of forging self is utilized after heating forging at 1050-1250 DEG C, make forging waste heat be obtained by, improve comprehensive mechanical performance simultaneously.
Experiments show that: compared with common heat treatment, after workpiece remnant forging thermal quenching, increase substantially mechanical property: hardness improves 10%, tensile strength improves 3%-10%, percentage elongation improves 10%-40%, impact flexibility improves 20%-30%.
Remnant forging thermal quenching of the present invention processes except basic Simplified flowsheet and raising performance, also has the advantage that
1. save the energy: owing to eliminating modified Quench heating operation, forging per ton can economize on electricity about at least 200KW.h, general modified part also tends to need to carry out a normalizing before modified quenching, normalizing heating process is taken into account, and forging per ton can economize on electricity at least 300KW.h;
2. saving steel: remnant forging thermal quenching can improve the intensity of steel under the premise ensureing enough plasticity, thus alleviating the quality of part, saving steel;
3. shorten the production cycle: owing to simplifying operation, eliminate the normalizing in former technique and quenching post bake time, therefore can significantly save man-hour.
Detailed description of the invention
Below the present invention is further described:
Embodiment 1
Putting in intermediate frequency furnace by steel bar, heating in medium frequency, to 1150 DEG C, adopts infrared thermometer temperature control; At 1050 DEG C, the bar after heating is sent into forging roll roll-in base, prepare automobile front axle blank; Automobile front axle blank carries out blocking, and controlling temperature is 920 DEG C, makes automobile front axle shape molding; At 880 DEG C, carry out essence die forging, remove the oxide layer on automobile front axle outer burr and surface, make the concrete size of automobile front axle be consistent with design size; Quickly being delivered in constant temperature oven by automobile front axle, at 850 DEG C, constant temperature processes 260 seconds, and the temperature making car surface is basically identical with the temperature of core; Automobile front axle after being processed by constant temperature is quickly sent in conveyer-type quench tank, and (in quenching tank, quenching liquid temperature is 10 DEG C, quenches 50 seconds; Automobile front axle after quenching is heated to 630 DEG C, temper 95 minutes; Obtain the qualified automobile front axle finished product forging that hardness is HRC45-48.
Embodiment 2
Putting in intermediate frequency furnace by steel bar, heating in medium frequency, to 1200 DEG C, adopts infrared thermometer temperature control; At 1100 DEG C, the bar after heating is sent into forging roll roll-in base, prepare automobile front axle blank; Automobile front axle blank carries out blocking, and controlling temperature is 950 DEG C, makes automobile front axle shape molding; At 920 DEG C, carry out essence die forging, remove the oxide layer on automobile front axle outer burr and surface, make the concrete size of automobile front axle be consistent with design size; Quickly being delivered in constant temperature oven by automobile front axle, at 860 DEG C, constant temperature processes 220 seconds, and the temperature making car surface is basically identical with the temperature of core; Automobile front axle after being processed by constant temperature is quickly sent in conveyer-type quench tank, and (in quenching tank, quenching liquid temperature is 35 DEG C, quenches 30 seconds; Automobile front axle after quenching is heated to 680 DEG C, temper 85 minutes; Obtain the qualified automobile front axle finished product forging that hardness is HRC45-48.
Embodiment 3
Putting in intermediate frequency furnace by steel bar, heating in medium frequency, to 1180 DEG C, adopts infrared thermometer temperature control; At 1080 DEG C, the bar after heating is sent into forging roll roll-in base, prepare automobile front axle blank; Automobile front axle blank carries out blocking, and controlling temperature is 935 DEG C, makes automobile front axle shape molding; At 900 DEG C, carry out essence die forging, remove the oxide layer on automobile front axle outer burr and surface, make the concrete size of automobile front axle be consistent with design size; Quickly being delivered in constant temperature oven by automobile front axle, at 855 DEG C, constant temperature processes 240 seconds, and the temperature making car surface is basically identical with the temperature of core;Automobile front axle after being processed by constant temperature is quickly sent in conveyer-type quench tank, and (in quenching tank, quenching liquid temperature is 20 DEG C, quenches 40 seconds; Automobile front axle after quenching is heated to 650 DEG C, temper 90 minutes; Obtain the qualified automobile front axle finished product forging that hardness is HRC45-48.
Experiments show that, compared with common heat treatment, after embodiment 1-3 adopts workpiece remnant forging thermal quenching, increase substantially the mechanical property of workpiece: hardness improves 10%, tensile strength improves 3%-10%, percentage elongation improves 10%-40%, impact flexibility improves 20%-30%.
It is only illustration to the present invention it should be noted that exemplified as above, is not intended that the restriction to protection scope of the present invention, every belong within protection scope of the present invention with the same or analogous design of the present invention.
Claims (1)
1. forging forming waste heat hardening and tempering process of an automobile front axle, it is characterised in that comprise the steps:
1) putting in intermediate frequency furnace by steel bar, heating in medium frequency, to 1150-1200 DEG C, adopts infrared thermometer temperature control;
2) at 1050-1100 DEG C, the bar after heating is sent into forging roll roll-in base, prepare automobile front axle blank;
3) automobile front axle blank is carried out blocking, control temperature and be 920-950 DEG C, make automobile front axle shape molding;
4) at 880-920 DEG C, carry out essence die forging, remove the oxide layer on automobile front axle outer burr and surface, make the concrete size of automobile front axle be consistent with design size;
5) being quickly delivered in constant temperature oven by automobile front axle, at 850-860 DEG C, constant temperature processes the 220-260 second, and the temperature making car surface is basically identical with the temperature of core;
6) automobile front axle after being processed by constant temperature is quickly sent in conveyer-type quench tank (in quenching tank, quenching liquid temperature is 10-35 DEG C) quenching 30-50 second;
7) automobile front axle after quenching is heated to 630-680 DEG C, temper 85-95 minute;
8) the qualified automobile front axle finished product forging that hardness is HRC45-48 is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610202402.9A CN105671252A (en) | 2016-04-01 | 2016-04-01 | One-time forging and pressing molding waste heat hardening and tempering technology for automobile front axle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610202402.9A CN105671252A (en) | 2016-04-01 | 2016-04-01 | One-time forging and pressing molding waste heat hardening and tempering technology for automobile front axle |
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| Publication Number | Publication Date |
|---|---|
| CN105671252A true CN105671252A (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610202402.9A Pending CN105671252A (en) | 2016-04-01 | 2016-04-01 | One-time forging and pressing molding waste heat hardening and tempering technology for automobile front axle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108441606A (en) * | 2018-03-30 | 2018-08-24 | 湖北神力锻造有限责任公司 | A kind of hardening and tempering process method in continuous gas heat-treatment furnace |
| CN108774672A (en) * | 2018-07-27 | 2018-11-09 | 庆铃汽车（集团）有限公司 | A method of utilizing forging part waste heat rapid heating and quenching |
| CN109175895A (en) * | 2018-09-12 | 2019-01-11 | 扬州诚德重工有限公司 | A kind of whole process intelligence forging round-bar pass method |
| CN109175177A (en) * | 2018-09-29 | 2019-01-11 | 河南科技大学 | A kind of preparation method of bucket tooth |
| CN112692221A (en) * | 2020-12-31 | 2021-04-23 | 辽宁乾金金属材料开发有限公司 | Automobile half shaft hot processing technology |
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| JP2005201349A (en) * | 2004-01-15 | 2005-07-28 | Ntn Corp | Rolling bearing and heat treatment method of steel |
| CN101011792A (en) * | 2007-02-08 | 2007-08-08 | 范承祥 | Manufacturing method for annular forging piece |
| CN101096745A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Composite high-strength high-ductility hardened and tempered steel and manufacturing method thereof |
| CN101524813A (en) * | 2009-04-01 | 2009-09-09 | 重庆歇马机械曲轴有限公司 | Waste heat hardening and tempering process of motorcycle crank forged piece |
| CN102605159A (en) * | 2012-03-01 | 2012-07-25 | 湖北神力锻造有限责任公司 | Waste heat temperature control quenching process method for front axle of large-scale vehicle |
-
2016
- 2016-04-01 CN CN201610202402.9A patent/CN105671252A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005201349A (en) * | 2004-01-15 | 2005-07-28 | Ntn Corp | Rolling bearing and heat treatment method of steel |
| CN101096745A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Composite high-strength high-ductility hardened and tempered steel and manufacturing method thereof |
| CN101011792A (en) * | 2007-02-08 | 2007-08-08 | 范承祥 | Manufacturing method for annular forging piece |
| CN101524813A (en) * | 2009-04-01 | 2009-09-09 | 重庆歇马机械曲轴有限公司 | Waste heat hardening and tempering process of motorcycle crank forged piece |
| CN102605159A (en) * | 2012-03-01 | 2012-07-25 | 湖北神力锻造有限责任公司 | Waste heat temperature control quenching process method for front axle of large-scale vehicle |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108441606A (en) * | 2018-03-30 | 2018-08-24 | 湖北神力锻造有限责任公司 | A kind of hardening and tempering process method in continuous gas heat-treatment furnace |
| CN108441606B (en) * | 2018-03-30 | 2020-01-14 | 湖北神力锻造有限责任公司 | Quenching and tempering process method in continuous gas heat treatment furnace |
| CN108774672A (en) * | 2018-07-27 | 2018-11-09 | 庆铃汽车（集团）有限公司 | A method of utilizing forging part waste heat rapid heating and quenching |
| CN109175895A (en) * | 2018-09-12 | 2019-01-11 | 扬州诚德重工有限公司 | A kind of whole process intelligence forging round-bar pass method |
| CN109175177A (en) * | 2018-09-29 | 2019-01-11 | 河南科技大学 | A kind of preparation method of bucket tooth |
| CN112692221A (en) * | 2020-12-31 | 2021-04-23 | 辽宁乾金金属材料开发有限公司 | Automobile half shaft hot processing technology |
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Application publication date: 20160615 |