CN103556104B - High-temperature low-pressure leads to the technique of hydrogen cleaning workpiece and cementing furnace - Google Patents
High-temperature low-pressure leads to the technique of hydrogen cleaning workpiece and cementing furnace Download PDFInfo
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- CN103556104B CN103556104B CN201310534951.2A CN201310534951A CN103556104B CN 103556104 B CN103556104 B CN 103556104B CN 201310534951 A CN201310534951 A CN 201310534951A CN 103556104 B CN103556104 B CN 103556104B
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Abstract
The invention discloses the technique that a kind of high-temperature low-pressure leads to hydrogen cleaning workpiece and cementing furnace, it is characterized in that, comprise the following steps: (one) vacuumizes heating: by vacuum carburizing stove evacuation, vacuum tightness is 5Pa, is incubated after being warmed up to 910 DEG C; (2) logical hydrogen: pass into hydrogen in vacuum cementation furnace, the flow of hydrogen is 2000L/h, until the pressure of vacuum cementation furnace reaches 200Pa, the charcoal ash of hydrogen reducing body of heater and the surface of purification workpiece; (3) hydrogen is extracted out: after the charcoal ash of hydrogen reducing body of heater and purification workpiece surface, extract the hydrogen in cementing furnace out.Usefulness of the present invention is: can save carbon black " cleaning " time greatly, and can accomplish regularly " cleaning ", convenient and swift, and convenient operation ensure that the clean of burner hearth, thus ensures quality and the speed of carburizing; Meanwhile, under high temperature, hydrogen can purify workpiece surface, ensure that the even of workpiece carbonization layer, substantially increases the quality of carburizing, has good effect to raising workpiece performance.
Description
Technical field
The present invention relates to a kind of technique purifying workpiece and cementing furnace, be specifically related to a kind of technique being purified workpiece and cementing furnace under high temperature, lower pressure by logical hydrogen.
Background technology
Cementing furnace uses for a long time and there will be carbon black, and it is too many that burner hearth accumulates carbon black (ash), can affect carburizing quality and speed, so, need regularly to clear up, this cleaning work, in fact exactly a general cleaning is carried out to burner hearth.But this " regularly " be difficult to a unification and regular time section.Reason is that carbon black (ash) gathers degree and carburization process has much relations with the penetration enhancer used.Such as, use the carburizing of instillation kerosene at pit furnace, due to kerosene carbon chain length, composition, active instability, decomposition thoroughly, so carbon distribution is soon black, will not carry out regular cleaning work depending on particular case; In the controlled carburizing using oxygen probe control techniques, if technique initialization carbon potential is higher, also can cause the sharply accumulation of carbon black (ash), and workpiece is placed and also can be occurred oxidative phenomena on surface, affects carburizing effect for a long time.
Present stage Application comparison extensively send out be blowing out cleaning, this cleaning mode is easily carried out, both economical, but cannot accomplish regular cleaning, and lose time, dally over one's work output, some carbon black (ash) also more difficult cleaning, be easy to during cleaning destruction burner hearth.
In addition, workpiece surface oxidation is also inevitable, has had a strong impact on the homogeneity of cementation zone, has caused serious impact to the performance of workpiece.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide a kind of technique purifying workpiece and cementing furnace, this technological operation facilitates, saves time and can accomplish regular cleaning, ensures the clean of burner hearth.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
High-temperature low-pressure leads to a technique for hydrogen cleaning workpiece and cementing furnace, it is characterized in that, comprises the following steps:
(1) vacuumize heating: by vacuum carburizing stove evacuation, vacuum tightness is 5Pa, is incubated after being warmed up to 910 DEG C;
(2) logical hydrogen: pass into hydrogen in vacuum cementation furnace, until the pressure of vacuum cementation furnace reaches 200Pa, the charcoal ash of hydrogen reducing body of heater and the surface of purification workpiece;
(3) hydrogen is extracted out: after the charcoal ash of hydrogen reducing body of heater and purification workpiece surface, extract the hydrogen in cementing furnace out.
Aforesaid high-temperature low-pressure leads to the technique of hydrogen cleaning workpiece and cementing furnace, it is characterized in that, aforesaid (one) vacuumizes heating and adopts ladder type of heating to heat up:
(1), vacuum carburizing stove evacuation, vacuum tightness is 5Pa, inflated with nitrogen convective heating to 550 DEG C, insulation 25-30min;
(2), vacuum carburizing stove evacuation, vacuum tightness is 5Pa, heating under vacuum to 850 DEG C, insulation 25-30min;
(3), heating under vacuum, to 910 DEG C, is incubated 25-30min again.
Aforesaid high-temperature low-pressure leads to the technique of hydrogen cleaning workpiece and cementing furnace, it is characterized in that, nitrogen be 1.1MPa to flowing pressure.
Aforesaid high-temperature low-pressure leads to the technique of hydrogen cleaning workpiece and cementing furnace, it is characterized in that, the flow of hydrogen is 2000L/h.
Usefulness of the present invention is: can save carbon black " cleaning " time greatly, and can accomplish regularly " cleaning ", convenient and swift, and convenient operation ensure that the clean of burner hearth, thus ensures quality and the speed of carburizing; Meanwhile, under high temperature, hydrogen can purify workpiece surface, ensure that the even of workpiece carbonization layer, substantially increases the quality of carburizing, has good effect to raising workpiece performance.
Embodiment
Below in conjunction with specific embodiment, concrete introduction is done to the present invention.
Embodiment 1
Do quench treatment to the part needle-valve body of fuel valve assembly, concrete steps are as follows:
One, vacuumize heating: by vacuum carburizing stove evacuation, vacuum tightness is 5Pa, is incubated after being warmed up to 910 DEG C, and wherein, vacuumize heating and adopt ladder type of heating to heat up, concrete steps are as follows:
1, vacuum carburizing stove evacuation, vacuum tightness is 5Pa, inflated with nitrogen convective heating to 550 DEG C, insulation 25min, guarantee that needle-valve body internal temperature also arrives 550 DEG C, nitrogen be 1.1MPa to flowing pressure;
2, vacuum carburizing stove evacuation, vacuum tightness is 5Pa, and heating under vacuum, to 850 DEG C, is incubated 25min;
3, heating under vacuum, to 910 DEG C, is incubated 25min again.
Two, logical hydrogen: pass into hydrogen in vacuum cementation furnace, hydrogen purity is 99.999%, and flow is 2000L/h, until the pressure of vacuum cementation furnace reaches 200Pa, the charcoal ash of hydrogen reducing body of heater and the surface of purification needle-valve body.
Three, hydrogen is extracted out: behind the charcoal ash of hydrogen reducing body of heater and purification needle-valve body surface, extract the hydrogen in cementing furnace out.
After hydrogen in cementing furnace is found time, the operations such as pulse carburizing can be carried out.
Test-results:
1, the material property such as needle-valve body hardness weave construction all reaches drawing requirement;
2, needle-valve body surface is very clean, does not have the impurity such as oxide skin, carbon black, can directly proceed to next procedure without except the process such as dirty, ball blast, cleaning;
3, stove internal surface also very clean, without carbon black.
Embodiment 2
Do quench treatment to the part needle-valve of fuel valve assembly, concrete steps are as follows:
One, vacuumize heating: by vacuum carburizing stove evacuation, vacuum tightness is 5Pa, is incubated after being warmed up to 910 DEG C, and wherein, vacuumize heating and adopt ladder type of heating to heat up, concrete steps are as follows:
1, vacuum carburizing stove evacuation, vacuum tightness is 5Pa, inflated with nitrogen convective heating to 550 DEG C, insulation 25min, guarantee that needle-valve internal temperature also arrives 550 DEG C, nitrogen be 1.1MPa to flowing pressure;
2, vacuum carburizing stove evacuation, vacuum tightness is 5Pa, and heating under vacuum, to 850 DEG C, is incubated 25min;
3, heating under vacuum, to 910 DEG C, is incubated 25min again.
Two, logical hydrogen: pass into hydrogen in vacuum cementation furnace, hydrogen purity is 99.999%, and flow is 2000L/h, until the pressure of vacuum cementation furnace reaches 200Pa, the charcoal ash of hydrogen reducing body of heater and the surface of purification needle-valve.
Three, hydrogen is extracted out: behind the charcoal ash of hydrogen reducing body of heater and purification needle-valve surface, extract the hydrogen in cementing furnace out.
After hydrogen in cementing furnace is found time, the operations such as pulse carburizing can be carried out.
Test-results:
1, the material property such as needle-valve hardness weave construction all reaches drawing requirement;
2, needle-valve surface is very clean, does not have the impurity such as oxide skin, carbon black, directly can proceed to next procedure without the process such as ball blast, cleaning;
3, stove internal surface also very clean, without carbon black.
Embodiment 3
Do quench treatment to plunger bushing, concrete steps are as follows:
One, vacuumize heating: by vacuum carburizing stove evacuation, vacuum tightness is 5Pa, is incubated after being warmed up to 910 DEG C, and wherein, vacuumize heating and adopt ladder type of heating to heat up, concrete steps are as follows:
1, vacuum carburizing stove evacuation, vacuum tightness is 5Pa, inflated with nitrogen convective heating to 550 DEG C, insulation 30min, guarantee that plunger bushing internal temperature also arrives 550 DEG C, nitrogen be 1.1MPa to flowing pressure;
2, vacuum carburizing stove evacuation, vacuum tightness is 5Pa, and heating under vacuum, to 850 DEG C, is incubated 30min;
3, heating under vacuum, to 910 DEG C, is incubated 30min again.
Two, logical hydrogen: pass into hydrogen in vacuum cementation furnace, hydrogen purity is 99.999%, and flow is 2000L/h, until the pressure of vacuum cementation furnace reaches 200Pa, the charcoal ash of hydrogen reducing body of heater and the surface of decontaminating column plug sleeve.
Three, hydrogen is extracted out: behind the charcoal ash of hydrogen reducing body of heater and decontaminating column plug sleeve surface, extract the hydrogen in cementing furnace out.
After hydrogen in cementing furnace is found time, the operations such as pulse carburizing can be carried out.
Test-results:
1, the material property such as plunger bushing hardness weave construction all reaches drawing requirement;
2, plunger bushing surface is very clean, does not have the impurity such as oxide skin, carbon black, directly can proceed to next procedure without the process such as ball blast, cleaning;
3, stove internal surface also very clean, without carbon black.
Under high temperature, hydrogen has good reductibility, and hydrogen, as reductive agent, to react generation methane with carbon, and carbon black (composition is carbon) point is taken off.In this reduction process, need to control well temperature (910 DEG C) on the one hand, the too high methane of temperature decomposes, and produce carbon atom and hydrogen, temperature is too low reduction reaction does not occur; Need to control well the flow (2000L/h) and furnace pressure (200Pa) that pass into hydrogen on the other hand.
Hydrogen at high temperature has good reductibility and very large diffusivity, can also reach the object of workpiece surface purification.
Therefore, the technique that high-temperature low-pressure of the present invention leads to hydrogen cleaning workpiece and cementing furnace also can be applicable to following field:
1, utilize the high-temperature reductibility of hydrogen, in the manufacturing processed of silicon, under high temperature, pass into hydrogen, manufacture high purity silicon;
2, during metal smelting, pass into hydrogen under high temperature, reducing metal oxide, obtain elemental metals.
It should be noted that, above-described embodiment does not limit the present invention in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops in protection scope of the present invention.
Claims (3)
1. high-temperature low-pressure leads to the technique of hydrogen cleaning workpiece and cementing furnace, it is characterized in that, comprises the following steps:
(1) vacuumize heating: by vacuum carburizing stove evacuation, vacuum tightness is 5Pa, is incubated after being warmed up to 910 DEG C;
(2) logical hydrogen: pass into hydrogen in vacuum cementation furnace, the flow of hydrogen is 2000L/h, until the pressure of vacuum cementation furnace reaches 200Pa, the charcoal ash of hydrogen reducing body of heater and the surface of purification workpiece;
(3) hydrogen is extracted out: after the charcoal ash of hydrogen reducing body of heater and purification workpiece surface, extract the hydrogen in cementing furnace out.
2. high-temperature low-pressure according to claim 1 leads to the technique of hydrogen cleaning workpiece and cementing furnace, it is characterized in that, described (one) vacuumizes heating and adopts ladder type of heating to heat up:
(1), vacuum carburizing stove evacuation, vacuum tightness is 5Pa, inflated with nitrogen convective heating to 550 DEG C, insulation 25-30min;
(2), vacuum carburizing stove evacuation, vacuum tightness is 5Pa, heating under vacuum to 850 DEG C, insulation 25-30min;
(3), heating under vacuum, to 910 DEG C, is incubated 25-30min again.
3. high-temperature low-pressure according to claim 2 leads to the technique of hydrogen cleaning workpiece and cementing furnace, it is characterized in that, nitrogen be 1.1MPa to flowing pressure.
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| CN2525099Y (en) * | 2002-03-12 | 2002-12-11 | 北京机电研究所 | Vacuum hydrogen protective heat treatment furnace |
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| CN2525099Y (en) * | 2002-03-12 | 2002-12-11 | 北京机电研究所 | Vacuum hydrogen protective heat treatment furnace |
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