CN104032121A - Steel bar heat treatment method - Google Patents
Steel bar heat treatment method Download PDFInfo
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- CN104032121A CN104032121A CN201410269255.8A CN201410269255A CN104032121A CN 104032121 A CN104032121 A CN 104032121A CN 201410269255 A CN201410269255 A CN 201410269255A CN 104032121 A CN104032121 A CN 104032121A
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- rod iron
- quenching
- temperature
- tempering
- heat treating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a steel bar heat treatment method which comprises the following steps: straightening, performing induction preheating, performing medium frequency induction quenching, checking, tempering, cooling and straightening, performing shot blasting, and demagnetizing. According to the technical scheme, the method has the advantages that steel subjected to heat treatment in the process is good in structure; good environment friendliness and safety are achieved due to adoption of water-based quenching. Moreover, the method also can be used for fixed-length material processing.
Description
Technical field
The application relates to metal material field, specifically a kind of heat treating method of rod iron.
Background technology
Metal heat treatmet is intended to change metal inside weave construction, improves mechanics of metal and mechanical property, for following process and the finished product provide required over-all properties requirement.
Steel part blank before mechanical workout all needs it to carry out modifier treatment.At present the heat treating method of rod iron material is, blocks rod iron material in advance and becomes to require size, then put into that resistance furnace heat-treats according to workpiece size.Traditional heat treating method, because heating is inhomogeneous, the weave construction that causes processing rear rod iron is not good enough, process controllability is poor simultaneously, and production efficiency low, consume energy high, greatly to the pollution of environment, affect environmental protection, dangerous.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of rod iron process of thermal treatment method is provided.The application is achieved through the following technical solutions:
A heat treating method for rod iron, comprises the following steps:
The first step, aligns: rod iron is manually put to material loading platform, delivered in a stepwise manner parallel roller-way through feeder, utilize straightener aligning, after aligning, by parallel roller-way, enter the front mechanical haulage machine of inductor block;
Second step, induction preheating: by the stable speed operation of mechanical haulage machine before inductor block, rod iron is sent in the induction heating semi-conductor frequency conversion device of heating system, rod iron is heated, reach preheating requirement temperature, after insulation, enter quenching mechanism, enter roller-way by mechanical haulage machine after inductor block;
The 3rd step, mid-frequency induction hardening: the mechanical haulage machine after inductor block of the rod iron after preheating enters roller-way, sends into the front mechanical haulage machine of intermediate frequency inductor in a stepwise manner, makes rod iron stable speed operation by tractor, rod iron is sent into intermediate frequency inductor and is heated, and carries out cold quenching after reaching quenching temperature.
The 4th step, checks: the rod iron quenching through the 3rd step, separates quenching unacceptable product;
The 5th step, tempering: will quench through the 3rd step and rod iron after the 4th step passed examination is sent into tempering stove and heated, is incubated, then water carries out cooling.
The 6th step, cooling and aligning: the rod iron after the 5th step temper is put to feeding platform, send into straightener aligning after its temperature naturally cooling;
The 7th step, shot-peening;
The 8th step, demagnetization: carry out demagnetization processing by sending into degausser through the rod iron of the 7th step processing.
In step second step of the present invention, induction preheating temperature is 200-400 DEG C.
In step the three steps of the present invention, quenching temperature is 850-1000 DEG C.
In step the five steps of the present invention, tempering Heating temperature is 450-600 DEG C.
In step the five steps of the present invention, tempering insulation time is 3-5 hour.
The present invention adopts above technical scheme tool to have the following advantages:
The steel weave construction obtaining after adopting method of the present invention to heat-treat is good, adopts water-based to quench, environmental protection, safety; Can be used for the long material processing of scale simultaneously.
Embodiment
Below in conjunction with embodiment, the application's technical scheme is elaborated:
The heat treating method of a kind of rod iron of the present invention, comprises the following steps:
The first step, aligning: rod iron material under supply of material state all more or less some distortion, before being processed to product, all can carry out straightening processing.Before thermal treatment, carry out straightening processing, avoid rod iron material produces in heat treatment process thermal distortion and original deformational overprint, cause deflection to be difficult to greatly the situation of correcting.Rod iron is manually put to material loading platform, delivered in a stepwise manner parallel roller-way through feeder, utilize straightener aligning, after aligning, by parallel roller-way, enter the front mechanical haulage machine of inductor block;
Second step, induction preheating: through after the first step aligning by the stable speed operation of mechanical haulage machine before inductor block, rod iron is sent in the induction heating semi-conductor frequency conversion device of heating system, rod iron is heated, reach preheating requirement temperature, after insulation certain hour, enter quenching mechanism, enter roller-way by mechanical haulage machine after inductor block.Before quenching, carry out thermal pretreatment and can solve the variety of issue bringing due to unrelieved stress, such as reducing distortion, improve the problem such as distribution of workpiece quench-hardened case in irregular shape.Thermal pretreatment can be improved the distribution of quench-hardened case and obtain best weave construction, obtains appropriate unrelieved stress Crack prevention.
In the present invention, preferably, induction preheating temperature is 200-400 DEG C.
The 3rd step, mid-frequency induction hardening: the mechanical haulage machine after inductor block of the rod iron after preheating enters roller-way, sends into the front mechanical haulage machine of intermediate frequency inductor in a stepwise manner, makes rod iron stable speed operation by tractor, rod iron is sent into intermediate frequency inductor and is heated, and carries out cold quenching after reaching quenching temperature.
The velocity of diffusion of alloying element is different, and the heating of quenching is mainly the austenite structure in order to obtain homogeneous, various beneficiating ingredients is dissolved in austenite and goes.The height of quenching temperature depends on material composition, in the time that alloying element is higher, generally will improve temperature, because alloying element can change the transformation temperature of material, structural transformation temperature is improved.Quenching temperature is too high, can make austenite crystal thick, and it is too much that while carbide dissolves in austenite, easy strain cracking after quenching, serious hardness and the intensity of reducing simultaneously, if temperature is too low, austenitizing will be incomplete, it is very few that carbide dissolves in austenite, most of carbide remains, also easy strain cracking after quenching, and after austenitizing, austenite carbon content is too low, after causing quenching, martensite hardness is inadequate, strength decreased.Induction heating because thermal source at workpiece surface, so rate of heating is fast, thermo-efficiency is high, workpiece is short heat-up time, workpiece is not because being entirety heating, so be out of shape littlely, surface oxidation decarburized amount is few, and gained workpiece surface hardness is high, notch sensitivity is little, and impelling strength, fatigue strength and wear resistance etc. all improve a lot.
In the present invention, preferred quenching temperature is 850-1000 DEG C.
The 4th step, checks: the rod iron quenching through the 3rd step, separates quenching unacceptable product; For rear substandard product after quenching, reharden after can annealing, if annealing is normal, do not have cracking, hardness not, organize the defect such as bad can carry out secondary quenching, but for the tighter workpiece of dimension precision requirement, if quenching after strain, cracking comparatively serious, need consider scrap or be separately used as him.
The 5th step, tempering: will quench through the 3rd step and rod iron after the 4th step passed examination is sent into tempering stove and heated, is incubated, then water carries out cooling.
For the workpiece that can proceed tempering after quenching, carry out temper.High tempering processing is commonly referred to modifier treatment.What modifier treatment obtained is tempered sorbite tissue, has good over-all properties.In many important mechanical structured members, as the connecting rod of stressed more complicated, several all class parts of important bolt, gear, are widely applied.Mechanical property after modifier treatment is compared with normalizing, and not only intensity is high, and plasticity and toughness also better.This is because the cementite in the tempered sorbite obtaining after modulation is particulate state, and in the form of sheets, granular cementite is to stoping the ratio sheet globular cementite of crackle in breaking-down process more favourable for the cementite in the sorbite that normalizing obtains.Therefore select high tempering processing in the present invention, preferred tempering temperature is 450-600 DEG C.
The embodiment providing according to the present invention tests, and the result obtaining is: surface hardness is HB260-280; Core hardness is in HB250 left and right; Core metallographic structure is uniform tempered sorbite tissue.
The 6th step, cooling and aligning: the rod iron after the 5th step temper is put to feeding platform, send into straightener aligning after its temperature naturally cooling.
The 7th step, shot-peening: there is in its surface one deck oxide skin through heat treated blank, the shot peening oxide skin of can polishing, the original gloss in reducing metal, and can eliminate blank internal stress.
The 8th step, carries out demagnetization processing by sending into degausser through the rod iron of the 7th step processing.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (5)
1. a heat treating method for rod iron, is characterized in that, comprises the following steps:
The first step, aligns: rod iron is manually put to material loading platform, delivered in a stepwise manner parallel roller-way through feeder, utilize straightener aligning, after aligning, by parallel roller-way, enter the front mechanical haulage machine of inductor block;
Second step, induction preheating: by the stable speed operation of mechanical haulage machine before inductor block, rod iron is sent in the induction heating semi-conductor frequency conversion device of heating system, rod iron is heated, reach preheating requirement temperature, after insulation, enter quenching mechanism, enter roller-way by mechanical haulage machine after inductor block;
The 3rd step, mid-frequency induction hardening: the mechanical haulage machine after inductor block of the rod iron after preheating enters roller-way, sends into the front mechanical haulage machine of intermediate frequency inductor in a stepwise manner, makes rod iron stable speed operation by tractor, rod iron is sent into intermediate frequency inductor and is heated, and carries out cold quenching after reaching quenching temperature;
The 4th step, checks: the rod iron quenching through the 3rd step, separates quenching unacceptable product;
The 5th step, tempering: will quench through the 3rd step and rod iron after the 4th step passed examination is sent into tempering stove and heated, is incubated, then water carries out cooling;
The 6th step, cooling and aligning: the rod iron after the 5th step temper is put to feeding platform, send into straightener aligning after its temperature naturally cooling;
The 7th step, shot-peening;
The 8th step, demagnetization: the rod iron after the 7th step shot-peening is sent into degausser and carry out demagnetization processing.
2. the heat treating method of a kind of rod iron according to claim 1, is characterized in that, in described step second step, induction preheating temperature is 200-400 DEG C.
3. the heat treating method of a kind of rod iron according to claim 1, is characterized in that, in described step the three steps, quenching temperature is 850-1000 DEG C.
4. the heat treating method of a kind of rod iron according to claim 1, is characterized in that, in described step the five steps, tempering Heating temperature is 450-600 DEG C.
5. the heat treating method of a kind of rod iron according to claim 1, is characterized in that, in described step the five steps, tempering insulation time is 3-5 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410269255.8A CN104032121A (en) | 2014-06-17 | 2014-06-17 | Steel bar heat treatment method |
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| CN201410269255.8A CN104032121A (en) | 2014-06-17 | 2014-06-17 | Steel bar heat treatment method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106702121A (en) * | 2016-12-20 | 2017-05-24 | 合肥市瀚坤机械有限公司 | Heat treatment technology of portal frame |
| CN112663117A (en) * | 2020-12-03 | 2021-04-16 | 西安博奥达金刚石工磨具有限公司 | Preparation method of high-precision electroplated diamond grinding wheel |
Citations (5)
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| JP2001040423A (en) * | 1999-07-27 | 2001-02-13 | High Frequency Heattreat Co Ltd | Steel bar whose strength is partially changed and heat treatment method and heat treatment apparatus therefor |
| US6699333B1 (en) * | 1998-06-29 | 2004-03-02 | Aubert & Duval | Case hardened steel with high tempering temperature, method for obtaining same and parts formed with said steel |
| CN101186962A (en) * | 2007-12-14 | 2008-05-28 | 天津市金能电力电子有限公司 | Technique for induction heating steel rod tempering heat treatment |
| CN101818241A (en) * | 2009-02-27 | 2010-09-01 | 上海华渊热处理有限公司 | Heat treatment method of steel bar |
| CN103484640A (en) * | 2013-09-10 | 2014-01-01 | 天津晋绥木业有限公司 | Heat treatment method of steel bars |
-
2014
- 2014-06-17 CN CN201410269255.8A patent/CN104032121A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6699333B1 (en) * | 1998-06-29 | 2004-03-02 | Aubert & Duval | Case hardened steel with high tempering temperature, method for obtaining same and parts formed with said steel |
| JP2001040423A (en) * | 1999-07-27 | 2001-02-13 | High Frequency Heattreat Co Ltd | Steel bar whose strength is partially changed and heat treatment method and heat treatment apparatus therefor |
| CN101186962A (en) * | 2007-12-14 | 2008-05-28 | 天津市金能电力电子有限公司 | Technique for induction heating steel rod tempering heat treatment |
| CN101818241A (en) * | 2009-02-27 | 2010-09-01 | 上海华渊热处理有限公司 | Heat treatment method of steel bar |
| CN103484640A (en) * | 2013-09-10 | 2014-01-01 | 天津晋绥木业有限公司 | Heat treatment method of steel bars |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106702121A (en) * | 2016-12-20 | 2017-05-24 | 合肥市瀚坤机械有限公司 | Heat treatment technology of portal frame |
| CN112663117A (en) * | 2020-12-03 | 2021-04-16 | 西安博奥达金刚石工磨具有限公司 | Preparation method of high-precision electroplated diamond grinding wheel |
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Application publication date: 20140910 |