CN103276343B - Controllable atmosphere carburizing method for multi-use furnace - Google Patents
Controllable atmosphere carburizing method for multi-use furnace Download PDFInfo
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- CN103276343B CN103276343B CN201310239438.0A CN201310239438A CN103276343B CN 103276343 B CN103276343 B CN 103276343B CN 201310239438 A CN201310239438 A CN 201310239438A CN 103276343 B CN103276343 B CN 103276343B
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Abstract
The invention discloses a controllable atmosphere carburizing method for a multi-use furnace, which comprises the following steps: mounting equipment and debugging a carburization furnace; adjusting the atmosphere in a way of ethyl acetate plus air; performing carburization for objective carburization materials; and performing heat treatment for the objective carburization materials. Due to the adoption of the method provided by the invention, a drilling tool made of imitated FF710 material can have a better carburization effect, so as to solve the problem that the long-term carburization for the FF710 material in the multi-use furnace is difficult. The method provided by the invention has the advantages of high automatic degree and capability of obtaining favorable metallographic structure and rigidity, can allow the drilling tool to have higher impact toughness and fatigue resistance so as to greatly prolong the service life of the drilling tool, and is economical.
Description
Technical field
The present invention relates to a kind of method for carburizing, espespecially a kind of multipurpose furnace controlled atmosphere method for carburizing.
Background technology
Carburizing (carbonitriding) quenching, as the Main Means to metallic substance thermo-chemical treatment, is carry out modification to workpiece, reaches and improves wear resistance, fatigue resistance, improves the object of obdurability comprehensive mechanical performance.Because drilling tool applying working condition is complicated, workpiece performance requriements is high, and good selection and rational thermal treatment process are the guarantees improving drilling tool work-ing life.Conventional converted steel major part is soft steel, low-carbon alloy steel, and carbon silicone content is lower, and carburizing is easy to realize; But imitative FF710 material has high silicon content and multiple alloying element, in conventional carburizing atmosphere as n-formyl sarcolysine alcohol+propane atmosphere, in propane+air Vertical Lift atmosphere, and carburizing poor effect in RX cracking atmosphere.
In multiple controlled atmosphere, do technological test to imitative FF710 material style, 925 DEG C of carburizings, 1.2%C carbon potential oozes by force 5 hours, 1.0%C carbon potential spreads 2 hours, and 0.85%C carbon potential is cooled to 845 DEG C, is incubated after 2 hours and quenches, equipment is multipurpose furnace, and here is the depth of penetration after different atmosphere carburizing:
All shallow than same stove Pinion Steel to depth of penetration in the normal atmosphere of imitative FF710 material style.Visible FF710 steel carburizing direct quenching ubiquitous tissue is thick, and outside surface hardness is lower than subsurface.And high-hardenability converted steel contains more alloying element, surperficial carbon containing, silicone content are high, cause martensite transformation temperature to decline to a great extent, and carburizing direct quenching remains abundant residues austenite in cementation zone, surface hardness is declined.Therefore be how the technical barrier of a difficulty in multipurpose furnace carburizing to the drilling tool of imitative FF710 material.
Summary of the invention
The object of the invention is to the defect overcoming prior art, and a kind of multipurpose furnace controlled atmosphere method for carburizing is provided, make the drilling tool of imitative FF710 material can obtain good carburizing effect, solve the technical barrier of FF710 material long-term carburizing difficulty in multipurpose furnace, have level of automation high, good metallographic structure and hardness can be obtained, make drilling tool obtain higher toughness and anti-fatigue performance, thus greatly improve the work-ing life of drilling tool, the advantage of economy.
The technical scheme realizing above-mentioned purpose is:
A kind of multipurpose furnace controlled atmosphere method for carburizing of the present invention, comprises step:
Erecting equipment also debugs cementing furnace;
The directly mode of oozing being added air by vinyl acetic monomer regulates atmosphere;
Carburizing is carried out to target carburized material;
To the thermal treatment of target carburized material.
Further improvement of the present invention is, describedly adds by vinyl acetic monomer the mode that air directly oozes and regulates atmosphere step to comprise further:
A certain amount of vinyl acetic monomer is controlled to pass in stove by under meter;
Actual measurement carbon potential value relatively in stove and technique preset carbon potential value;
When described actual measurement carbon potential value is higher than described default carbon potential value, automatically pass into air by an air control valve; When described actual measurement carbon potential value is lower than described default carbon potential value, described air control valve stops passing into of air automatically.
Further improvement of the present invention is, described air control valve regulates air flow quantity to keep the balance of carbon potential in stove automatically.
Further improvement of the present invention is, describedly carries out carburization step to target carburized material and comprises further:
Ooze by force 180 minutes to target carburized material, wherein carbon potential remains 1.23%C, and vinyl acetic monomer flow is 0.35L/h;
Spread 120 minutes to target carburized material, wherein carbon potential remains 1.0%C, and vinyl acetic monomer flow is 0.25L/h.
Further improvement of the present invention is, describedly heat-treats step to target carburized material and comprises further:
Be cooled to 840 DEG C, be incubated 30 minutes and quench;
Tempering when being cooled to 650 DEG C;
Be warming up to 790 DEG C of rear low-temperaturetemperings of quenching.
Further improvement of the present invention is, described cementing furnace adopts sealing box type multipurpose furnace.
Further improvement of the present invention is, adopt in the burner hearth of described cementing furnace silicon carbide horse not plate as carburizing atmosphere guiding device.
Further improvement of the present invention is, guarantees temperature uniformity in the effective heating work district of burner hearth and atmosphere evenness by adopting a strong cyclic blower fan.
The present invention is owing to have employed above technical scheme, and making it have following beneficial effect is:
Adding by vinyl acetic monomer the mode that air directly oozes regulates atmosphere at the Successful utilization of multipurpose furnace, solves the problem of imitative FF710 class drilling tool material carburizing difficulty in multipurpose furnace.Drill bit, piston be high by level of automation, control superior multipurpose furnace thermal treatment, obtains good metallographic structure and hardness, makes drilling tool obtain higher toughness and anti-fatigue performance, thus greatly improve the work-ing life of drilling tool.Vinyl acetic monomer than carburizing medium propane conventional in the past or acetone price low by about 30%, there is the advantage of more economical saving.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
A kind of multipurpose furnace controlled atmosphere method for carburizing of the present invention, comprises step:
One, first erecting equipment debug cementing furnace;
Wherein carburizing adopts sealing box type multipurpose furnace, adopt in the burner hearth of carburizing silicon carbide horse not plate as carburizing atmosphere guiding device; A strong cyclic blower fan is adopted to guarantee temperature uniformity in the effective heating work district of burner hearth and atmosphere evenness; By a computer carbon Ore-controlling Role to the calculation and control of the thermal treatment process in whole cementation process, and the carbon diffusion layer calculated continuously, in real time in stove and surface carbon concentration.
Two, the directly mode of oozing then adding air by vinyl acetic monomer regulates atmosphere,
A certain amount of vinyl acetic monomer is controlled to pass in stove by under meter;
Actual measurement carbon potential value relatively in stove and technique preset carbon potential value;
When surveying carbon potential value higher than default carbon potential value, automatically pass into air by an air control valve; When surveying carbon potential value lower than default carbon potential value, air control valve stops passing into of air automatically.
In this process, air control valve regulates air flow quantity to keep the balance of carbon potential in stove automatically.
The present embodiment can adopt following steps:
Remain on 1.2%C with vinyl acetic monomer gas making carbon potential and test carbon potential regulation and control situation, being down to 0.4%C from 1.2%C, then rising to 1.2%C by 0.4%C; Observe pressure lock closedown, vinyl acetic monomer flow control situation.Check that purging line joint leaks, initial flow 0.75L/h, carbon potential is raised to 1.2c%, keeps carbon potential 1.0c% about eight hours, vinyl acetic monomer flow 0.22L/h.
Three, then, carburizing is carried out to target carburized material, specifically comprises step:
Ooze by force 180 minutes to target carburized material, wherein carbon potential remains 1.23%C, and vinyl acetic monomer flow is 0.35L/h;
Spread 120 minutes to target carburized material, wherein carbon potential remains 1.0c%C, and vinyl acetic monomer flow is 0.25L/h.
Four, last, to the thermal treatment of target carburized material, comprise step further:
Be cooled to 840 DEG C, be incubated 30 minutes and quench;
Tempering when being cooled to 650 DEG C;
Be warming up to 790 DEG C of rear low-temperaturetemperings of quenching.
Technical requirements is depth of penetration 1.2 ~ 1.5mm, surface hardness: 57 ~ 61HRC, and martensite, carbide, retained austenite are 1 ~ 4 grade.
The directly mode of oozing being added air by vinyl acetic monomer regulates atmosphere at the Successful utilization of multipurpose furnace, solves the problem of drilling tool material in multipurpose furnace carburizing difficulty.Drill bit, piston are high by level of automation, control superior multipurpose furnace thermal treatment, obtain good metallographic structure and hardness, make drilling tool obtain higher toughness and anti-fatigue performance, thus greatly improve the work-ing life of drilling tool.Vinyl acetic monomer is lower by about 30% than carburizing medium propane conventional in the past, acetone price, has the advantage of more economical saving.
Now to FF710(1 material), 23CrNi3Mo(2 material), 20Cr2Ni4(3 material) adopt present invention process to carry out the experiment of multipurpose furnace vinyl acetic monomer, result is as shown in the table:
By upper table as seen by adopting technique of the present invention, imitative FF710 drilling tool material achieves desirable carburizing effect in multipurpose furnace.
Below embodiment is to invention has been detailed description by reference to the accompanying drawings, and those skilled in the art can make many variations example to the present invention according to the above description.Thus, some details in embodiment should not form limitation of the invention, the present invention by the scope that defines using appended claims as protection scope of the present invention.
Claims (7)
1. a multipurpose furnace controlled atmosphere method for carburizing, is characterized in that, comprises step:
Erecting equipment also debugs cementing furnace;
The directly mode of oozing being added air by vinyl acetic monomer regulates atmosphere;
Carburizing is carried out to target carburized material;
To the thermal treatment of target carburized material;
Wherein, adding by vinyl acetic monomer the mode that air directly oozes regulates atmosphere step to comprise further:
A certain amount of vinyl acetic monomer is controlled to pass in stove by under meter;
Actual measurement carbon potential value relatively in stove and technique preset carbon potential value;
When described actual measurement carbon potential value is higher than described default carbon potential value, automatically pass into air by an air control valve; When described actual measurement carbon potential value is lower than described default carbon potential value, described air control valve stops passing into of air automatically.
2. multipurpose furnace controlled atmosphere method for carburizing according to claim 1, is characterized in that, described air control valve regulates air flow quantity to keep the balance of carbon potential in stove automatically.
3. multipurpose furnace controlled atmosphere method for carburizing according to claim 1, is characterized in that, describedly carries out carburization step to target carburized material and comprises further:
Ooze by force 180 minutes to target carburized material, wherein carbon potential remains 1.23%C, and vinyl acetic monomer flow is 0.35L/h;
Spread 120 minutes to target carburized material, wherein carbon potential remains 1.0%C, and vinyl acetic monomer flow is 0.25L/h.
4. multipurpose furnace controlled atmosphere method for carburizing according to claim 1, is characterized in that, describedly heat-treats step to target carburized material and comprises further:
Be cooled to 840 DEG C, be incubated 30 minutes and quench;
Tempering when being cooled to 650 DEG C;
Be warming up to 790 DEG C of rear low-temperaturetemperings of quenching.
5. multipurpose furnace controlled atmosphere method for carburizing according to claim 1, is characterized in that, described cementing furnace adopts sealing box type multipurpose furnace.
6. multipurpose furnace controlled atmosphere method for carburizing according to claim 1, is characterized in that, adopt in the burner hearth of described cementing furnace silicon carbide horse not plate as carburizing atmosphere guiding device.
7. multipurpose furnace controlled atmosphere method for carburizing according to claim 1, is characterized in that, guarantees temperature uniformity in the effective heating work district of burner hearth and atmosphere evenness by adopting a strong cyclic blower fan.
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| CN110656300B (en) * | 2019-10-17 | 2021-10-01 | 安徽绿能技术研究院有限公司 | Carburizing process of DC53 steel |
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