CN105154630B - A kind of high-voltage switch gear pipe valve preparation method and high-voltage switch gear pipe valve - Google Patents
A kind of high-voltage switch gear pipe valve preparation method and high-voltage switch gear pipe valve Download PDFInfo
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- CN105154630B CN105154630B CN201510577358.5A CN201510577358A CN105154630B CN 105154630 B CN105154630 B CN 105154630B CN 201510577358 A CN201510577358 A CN 201510577358A CN 105154630 B CN105154630 B CN 105154630B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000005255 carburizing Methods 0.000 claims abstract description 43
- 238000010791 quenching Methods 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000000171 quenching effect Effects 0.000 claims abstract description 10
- 239000012467 final product Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 6
- 235000002918 Fraxinus excelsior Nutrition 0.000 claims description 2
- 239000002956 ash Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 22
- 239000003921 oil Substances 0.000 description 20
- 229910052799 carbon Inorganic materials 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Abstract
The present invention relates to a kind of high-voltage switch gear pipe valve preparation method and high-voltage switch gear pipe valve, belong to technical field of heat treatment.The high-voltage switch gear pipe valve preparation method comprises the following steps：High-voltage switch gear pipe valve blank is carried out at 910 930 DEG C carburizing and carburized layer is formed, cooled down, obtain carburizing pipe valve workpiece；The carburizing pipe valve workpiece heat that will be obtained is cooled down to 4 16min are incubated at 880 900 DEG C, obtains normalizing pipe valve workpiece；The valve port line part at the normalizing pipe valve workpiece two ends to obtaining is heated to 870 890 DEG C, is cooled down in oil, and must quench pipe valve workpiece；The quenching pipe valve workpiece that will be obtained is tempered 60 90min at 490 510 DEG C, and cooling is obtained final product.High-voltage switch gear pipe valve preparation method of the invention meets the reliability requirement of high-voltage switch gear pipe valve, can ensure that the normal work of high-voltage switch gear hydraulic mechanism, and operation is flexible, point, in-place closing.
Description
Technical field
The present invention relates to a kind of high-voltage switch gear pipe valve preparation method and high-voltage switch gear pipe valve, belong to technical field of heat treatment.
Background technology
Carburization process is widely used chemical heat treatment process in machine building industry, be primarily adapted for use in bear abrasion,
The equipment part of alternation contact stress or bending stress and shock loading, such as gear, support, piston pin part, especially in car
, in device fabrication industry using more universal.Carburization process refers to that steel-iron components are heated and be incubated in carburizing medium, makes carbon
Atom penetrates into piece surface, increases the phosphorus content on steel-iron components top layers, and obtains at a kind of chemical heat of certain carbon profile
Science and engineering skill.The purpose of carburizing is to obtain phosphorus content high, and quenched, tempering on the surface of mild steel or low-carbon alloy steel part
Afterwards, piece surface is made to obtain hardness and wearability high, and the centre of part still keeps certain intensity and modeling higher
Property and toughness.
Field is manufactured in high-voltage switch gear, carburization process also has certain application.Pipe valve is on high-voltage switch gear hydraulic mechanism
One vital part, high-voltage switch gear pipe valve is tubular structure, including middle pipeline section, middle pipeline section one end is connected with combined floodgate section, separately
One end is connected with separating brake section, and the outer tube wall of combined floodgate section is with diameter greater than middle pipeline section outer tube wall diameter, the outer tube wall diameter of separating brake section
Less than middle pipeline section pipe outer wall diameter.During specific works, in the presence of hydraulic oil, pipe valve makees reciprocal punching in valve body along axis
Hit motion.This requires that pipe valve has certain wearability, and two ends inclined-plane valve port seal line (valve port line) be in it is strong
Must not deformed depression or scaling-off cracking under percussion, it is necessary to have enough intensity, hardness and fatigue resistance, while again
Seeking the core of pipe valve should keep certain intensity and good toughness.
In the prior art, in order to improve the reliability of high-voltage switch gear pipe valve, carburizing, quenching, low is typically carried out to pipe valve
Warm temper.Between 55~60HRC, matrix hardness is between 39~45HRC for pipe valve carburized surface hardness after treatment.But
It is after the heat treated pipe valve application on-board the circuit breaker of this carburizing, to be easy to pipe valve deformation, cracking thing during running
Therefore.Its reason may is that the pipe valve is a kind of thin-walled parts, thinnest part only thickness 2mm, by after above-mentioned heat treatment, although its
Surface and matrix hardness are higher, with intensity higher, but by the impact born at pipe valve at work two ends valve port line
Bearing strength test concentrates larger, point, operation of closing a floodgate just occur that valve port line depression broadens even local bursting crack, deformation for only more than 200 times
And cause oil leakage phenomenon.
The content of the invention
It is an object of the invention to provide a kind of high-voltage switch gear pipe valve preparation method, to solve prior art high-voltage switch
Easily be recessed at pipe valve sealing valve port line, deform or local bursting crack problem.It is a kind of above-mentioned the present invention also aims to provide
The treated high-voltage switch gear pipe valve of method.
In order to realize the above object the technical scheme of high-voltage switch gear pipe valve preparation method of the invention is as follows：
A kind of high-voltage switch gear pipe valve preparation method, comprises the following steps：
1) carburizing：High-voltage switch gear pipe valve blank is carried out at 910-930 DEG C carburizing and carburized layer is formed, cooled down, must oozed
Carbon pipe valve workpiece；
2) normalizing：By step 1) in the carburizing pipe valve workpiece heat that obtains to 4-16min is incubated at 880-900 DEG C, cool down,
Obtain normalizing pipe valve workpiece；
3) selective hardening：To step 2) in the valve port line part of normalizing pipe valve workpiece one end that obtains be heated to 870-890
DEG C, cooled down in oil, the valve port line part of the other end is then heated to 870-890 DEG C, cooled down in oil, must quench pipe valve work
Part；
4) high tempering：By step 3) the quenching pipe valve workpiece that obtains is tempered 60-90min at 490-510 DEG C, cooling, i.e.,
.
High-voltage switch gear pipe valve preparation method of the invention is after carburizing and normalizing to the valve port line of the outer tube wall at pipe valve two ends
Position carries out selective hardening, improves hardness, intensity and the wearability at above-mentioned position, and for the outer tube wall of pipe valve middle part
Do not quenched, while it is kept certain hardness, also maintained toughness higher, it is to avoid the outer tube at pipe valve two ends
Occur depression, deformation and Fragmentation Phenomena caused by stress concentration at the valve port line of wall and middle part outer tube wall intersection, keep away
Exempt from the generation of oil leakage phenomenon, it is ensured that the normal divide-shut brake of high-voltage switch gear pipe valve, improve the reliability during its military service.
The high-voltage switch gear pipe valve is tubular structure, including middle pipeline section, and middle pipeline section one end is connected with combined floodgate section, another
End is connected with separating brake section, and the outer tube wall of combined floodgate section is with diameter greater than middle pipeline section outer tube wall diameter, and the outer tube wall diameter of separating brake section is small
In middle pipeline section pipe outer wall diameter.The valve port line part be high-voltage switch gear pipe valve combined floodgate section and separating brake section outer tube wall with it is corresponding
External part top pressure coordinate position.
The step 3) in the valve port line part of normalizing pipe valve workpiece be heated to 870-890 DEG C within a short period of time, specifically
, the time is can be controlled within 10s, such as 8-10s.
It is the Steel material of 20CrMnMo that the material of the high-voltage switch gear pipe valve uses the trade mark, and its mass percent composition is：
The Cr of the Mn of the Si of the C of 0.17%-0.23%, 0.17%-0.37%, 0.90%-1.20%, 1.10%-1.40%,
The Mo of 0.20%-0.30%, balance of Fe.
The high-voltage switch gear pipe valve blank is the high-voltage switch gear pipe valve blank processed according to above-mentioned material blanking rear car.For
Ensure that pipe valve workpiece remains to keep certain carburized layer thickness, the step 1 after processing of polishing) high-voltage switch gear pipe valve hair
The outer tube wall of base has mill amount of staying, described to stay mill amount less than the thickness of the carburized layer.
Preferably, the step 1) in carburized layer thickness be 0.9-1.1mm, the step 1) high-voltage switch gear pipe valve
The outer tube wall of blank has 0.2-0.3mm's to stay mill amount.So after processing and forming, the thickness of carburized layer is maintained at 0.6-
0.9mm。
In order to remove the material of pipe valve excess surface, be molded pipe valve, the step 1) in the carburizing pipe valve workpiece that obtains
Carry out being processed shaping before normalizing, grind off and stay mill amount.
The step 1) in cooling be cooled to after 830 DEG C using stove and go out that space for collecting ashes in a stove is cold or stove is cooled to less than 500 DEG C and comes out of the stove and carries out
Air cooling.
The step 1) in carburizing can use method for carburizing of the prior art, it is general, using case-hardening furnace or
Pit carburizing furnace carries out Carburization Treatment.
In order to ensure the effect of normalizing, soaking time is different according to different mode of heatings, the step 2) middle heating
Using salt bath furnace or batch-type furnace, soaking time is 4-6min when using salt bath stove heat, when being incubated during using box stove heat
Between be 14-16min；Preferably, the step 4) in when using salt bath stove heat soaking time be 5min, using box stove heat
When soaking time be 15min.
The step 2) in be cooled to naturally cool to room temperature in atmosphere.
The step 4) in be cooled to naturally cool to room temperature in atmosphere.
The technical scheme of high-voltage switch gear pipe valve of the invention is as follows：
One kind is using high-voltage switch gear pipe valve obtained in above-mentioned preparation method.
The treated high-voltage switch gear pipe valve two ends valve port line part surface of high-voltage switch gear pipe valve preparation method of the invention is hard
Degree is higher, between 45-50HRC, meets its requirement to wearability, and intervalve segment table surface hardness has between 37-43HRC
The intensity being necessary；And the matrix hardness at non-carburizing position controls between 23-32HRC, to disclosure satisfy that toughness requirements.That is carburizing
Selective hardening part afterwards has hardness higher, intensity and wearability, and the part without quenching after carburizing is with foot
With toughness higher while enough hardness and intensity, material potential is given full play to, made the pipe valve will not in ballistic motion
Produce brittle cracking, cause oil leak and influence high-voltage switch gear point, combined floodgate performance.The reliability for meeting high-voltage switch gear pipe valve will
Ask, can ensure that the normal work of high-voltage switch gear hydraulic mechanism, operation is flexible, point, in-place closing.
Brief description of the drawings
Fig. 1 is the structural representation of the carburizing blank of the high-voltage switch gear pipe valve of comparative example of the invention；
Fig. 2 is the structural representation of the carburizing blank of the high-voltage switch gear pipe valve of embodiments of the invention 1；
Fig. 3 is the shaping workpiece structure and selective hardening position view of the high-voltage switch gear pipe valve of embodiments of the invention 1.
Specific embodiment
Technical scheme is further described below by specific embodiment.
Embodiment 1
The high-voltage switch gear pipe valve preparation method of the present embodiment comprises the following steps：
1) blank processing：By high-voltage switch gear pipe valve blanking, the specific composition of material therefor is shown in Table 1, according to structure shown in Fig. 2
Vehicle Processing goes out high-voltage switch gear pipe valve blank, and it is 0.3mm that the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount；
Table 1
2) carburizing：By step 1) in the high-voltage switch gear pipe valve blank that obtains oozed at 910 DEG C using case-hardening furnace
Carbon, carburized layer is formed in injectron valve surface, and carburized layer thickness is 0.9mm, and hole of coming out of the stove is carried out after then stove is cooled to 830 DEG C
It is cooled to room temperature, obtains carburizing pipe valve workpiece；
3) process：By step 2) the carburizing pipe valve workpiece that obtains processes shaping pipe valve workpiece according to structure shown in Fig. 3；
The high-voltage switch gear pipe valve is tubular structure, including middle pipeline section 1, middle pipeline section one end is connected with separating brake section 2, separately
One end is connected with combined floodgate section 3, and the outer tube wall of combined floodgate section is with diameter greater than middle pipeline section outer tube wall diameter, the outer tube wall diameter of separating brake section
Less than middle pipeline section pipe outer wall diameter.
4) normalizing：By step 3) in the shaping pipe valve workpiece that obtains be heated to 900 DEG C using salt bath furnace, be incubated 5min,
Room temperature is naturally cooled in air, normalizing pipe valve workpiece is obtained；
5) selective hardening：By step 4) the normalizing pipe valve workpiece that obtains is placed on high-frequency induction heating apparatus, aligns fire tube
The valve port line part of the outer tube wall of valve workpiece one end is heated to 890 DEG C in 10s, is cooled down in oil, then by the valve of the other end
Mouth line part is heated to 890 DEG C in 10s, is cooled down in oil, and must quench pipe valve workpiece；The valve port line part is high-voltage switch gear
The position that the outer tube wall of pipe valve combined floodgate section and separating brake section coordinates with corresponding external part top pressure, it is specific such as point at A and B in Fig. 3
Shown in setting-out part；
6) high tempering：By step 5) in the quenching pipe valve workpiece that obtains 90min is tempered at 490 DEG C using batch-type furnace,
Room temperature is naturally cooled in atmosphere, is refined, obtain final product.
The high-voltage switch gear pipe valve of the present embodiment is using high-voltage switch gear pipe valve obtained in the above method.
Embodiment 2
The high-voltage switch gear pipe valve preparation method of the present embodiment comprises the following steps：
1) blank processing：High-voltage switch gear pipe valve blanking, the specific composition of material therefor are shown in Table 1, according to the phase of embodiment 1
Same mode Vehicle Processing goes out high-voltage switch gear pipe valve blank, and it is 0.2mm that the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount；
2) carburizing：By step 1) in the high-voltage switch gear pipe valve blank that obtains oozed at 930 DEG C using pit carburizing furnace
Carbon, carburized layer is formed in injectron valve surface, and carburized layer thickness is 1.1mm, and then stove is come out of the stove after being cooled to 500 DEG C carries out sky
It is cooled to room temperature, obtains carburizing pipe valve workpiece；
3) process：By step 2) the carburizing pipe valve workpiece that obtains processes formed pipe according to the same manner as in Example 1
Valve workpiece；
4) normalizing：By step 3) in the shaping pipe valve workpiece that obtains be heated to 880 DEG C using batch-type furnace, be incubated 15min,
Room temperature is naturally cooled in air, normalizing pipe valve workpiece is obtained；
5) selective hardening：By step 4) the normalizing pipe valve workpiece that obtains is placed on high-frequency induction heating apparatus, aligns fire tube
The valve port line part of the outer tube wall of valve workpiece one end is heated to 870 DEG C in 8s, is cooled down in oil, then by the valve port of the other end
Line part is heated to 870 DEG C in 8s, is cooled down in oil, and must quench pipe valve workpiece；The valve port line part with embodiment 1, then
Room temperature is cooled in oil, must quench pipe valve workpiece；
6) high tempering：By step 5) in the quenching pipe valve workpiece that obtains 60min is tempered at 510 DEG C using shaft furnace,
Room temperature is naturally cooled in atmosphere, is refined, obtain final product.
The high-voltage switch gear pipe valve of the present embodiment is using high-voltage switch gear pipe valve obtained in the above method.
Embodiment 3
The high-voltage switch gear pipe valve preparation method of the present embodiment comprises the following steps：
1) blank processing：High-voltage switch gear pipe valve blanking, the specific composition of material therefor are shown in Table 1, according to the phase of embodiment 1
Same mode Vehicle Processing goes out high-voltage switch gear pipe valve blank, and it is 0.25mm that the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount；
2) carburizing：By step 1) in the high-voltage switch gear pipe valve blank that obtains oozed at 920 DEG C using pit carburizing furnace
Carbon, carburized layer is formed in injectron valve surface, and carburized layer thickness is 1.0mm, and then stove is come out of the stove after being cooled to 500 DEG C carries out sky
It is cooled to room temperature, obtains carburizing pipe valve workpiece；
3) process：By step 2) the carburizing pipe valve workpiece that obtains processes formed pipe according to the same manner as in Example 1
Valve workpiece；
4) normalizing：By step 3) in the shaping pipe valve workpiece that obtains be heated to 890 DEG C using salt bath furnace, be incubated 4min,
Room temperature is naturally cooled in air, normalizing pipe valve workpiece is obtained；
5) selective hardening：By step 4) the normalizing pipe valve workpiece that obtains is placed on high-frequency induction heating apparatus, aligns fire tube
The valve port line part of the outer tube wall of valve workpiece one end is heated to 880 DEG C in 9s, is cooled down in oil, then by the valve port of the other end
Line part is heated to 880 DEG C in 9s, is cooled down in oil, and must quench pipe valve workpiece；The valve port line anti-wear component with embodiment 1,
Then room temperature is cooled in oil, must quench pipe valve workpiece；
6) high tempering：By step 5) in the quenching pipe valve workpiece that obtains 70min is tempered at 500 DEG C using shaft furnace,
Room temperature is naturally cooled in atmosphere, is refined, obtain final product.
The high-voltage switch gear pipe valve of the present embodiment is using high-voltage switch gear pipe valve obtained in the above method.
Embodiment 4
The high-voltage switch gear pipe valve preparation method of the present embodiment comprises the following steps：
1) blank processing：High-voltage switch gear pipe valve blanking, the specific composition of material therefor are shown in Table 2, according to the phase of embodiment 1
Same mode Vehicle Processing goes out high-voltage switch gear pipe valve blank, and it is 0.25mm that the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount；
Table 2
2) carburizing：By step 1) in the high-voltage switch gear pipe valve blank that obtains oozed at 920 DEG C using pit carburizing furnace
Carbon, carburized layer is formed in injectron valve surface, and carburized layer thickness is 1.0mm, and sky of coming out of the stove is carried out after then stove is cooled to 500 DEG C
It is cooled to room temperature, obtains carburizing pipe valve workpiece；
3) normalizing：By step 2) in the carburizing pipe valve workpiece that obtains be heated to 880 DEG C using salt bath furnace, be incubated 6min,
Room temperature is naturally cooled in air, normalizing pipe valve workpiece is obtained；
4) selective hardening：By step 3) the normalizing pipe valve workpiece that obtains is placed on high-frequency induction heating apparatus, aligns fire tube
The valve port line part of the outer tube wall of valve workpiece one end is heated to 880 DEG C in 9s, is cooled down in oil, then by the valve port of the other end
Line part is heated to 880 DEG C in 9s, is cooled down in oil, and must quench pipe valve workpiece；The valve port line part with embodiment 1, then
Room temperature is cooled in oil, must quench pipe valve workpiece；
5) high tempering：By step 4) in the quenching pipe valve workpiece that obtains 70min is tempered at 500 DEG C using shaft furnace,
Room temperature is naturally cooled in atmosphere, is refined, obtain final product.
The high-voltage switch gear pipe valve of the present embodiment is using high-voltage switch gear pipe valve obtained in the above method.
Comparative example
The high pressure pipe valve heat treatment method of the present embodiment comprises the following steps：
1) blank processing：By high-voltage switch gear pipe valve blanking, the specific composition of material therefor is shown in Table 1, according to structure shown in Fig. 1
Vehicle Processing goes out high-voltage switch gear pipe valve blank, and it is 0.3mm that the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount；
2) carburizing：By step 1) in the high-voltage switch gear pipe valve blank that obtains oozed at 910 DEG C using case-hardening furnace
Carbon, carburized layer is formed in injectron valve surface, and carburized layer thickness is 0.9mm, and hole of coming out of the stove is carried out after then stove is cooled to 830 DEG C
It is cooled to room temperature, obtains carburizing pipe valve workpiece；
3) process：By step 2) the carburizing pipe valve workpiece that obtains processes formed pipe according to the same manner as in Example 1
Valve workpiece；
4) quench：By step 3) in the shaping pipe valve workpiece that obtains be heated to 860 DEG C using batch-type furnace, be incubated 15min, so
Room temperature is cooled in oil afterwards, must quench pipe valve workpiece；
5) it is tempered：By step 4) in the quenching pipe valve workpiece that obtains 120min is tempered at 200 DEG C using batch-type furnace, in sky
Room temperature is naturally cooled in gas, is refined, obtained final product.
The high-voltage switch gear pipe valve of this comparative example is using high-voltage switch gear pipe valve obtained in the above method.
Experimental example
To its hardness of injectron valve test and operational reliability for being finally given using embodiment 1-4 and comparative example,
Concrete outcome is shown in Table 3.
Injectron valve test result heat treated in the embodiment 1-4 of table 3 and comparative example
The treated high-voltage switch gear pipe valve of the method for the present invention is tested through mechanical endurance test and found, either in specified oil
Carried out under the conditions of pressure, rated voltage, or in oil pressure high, high voltage, or low oil pressure, low-voltage etc. point, closing operation, point, conjunction
Flexibly in place, pipe valve situation without exception, mechanism's ne-leakage phenomenon, valve port line does not have to beat heap depression and Fragmentation Phenomena lock, complete
The performance requirement that full up sufficient hydraulic mechanism is on active service.
Heat treatment method multiplicity of the invention is high, it is easy to production operation, part quality stabilization, under arms during safety
It is reliable, normal point, combined floodgate work of high-voltage switch gear hydraulic mechanism are can ensure that, economic benefits comparison is notable.
Claims (7)
1. a kind of high-voltage switch gear pipe valve preparation method, it is characterised in that comprise the following steps：
1) carburizing：High-voltage switch gear pipe valve blank is carried out at 910-930 DEG C carburizing and carburized layer is formed, cooled down, obtain carburizing pipe
Valve workpiece；The outer tube wall of high-voltage switch gear pipe valve blank stays mill amount for 0.2-0.3mm, the thickness of the carburized layer with mill amount is stayed
It is 0.9-1.1mm；
Step 1) in the carburizing pipe valve workpiece that obtains carry out being processed shaping before normalizing；
2) normalizing：By step 1) in the carburizing pipe valve workpiece heat that obtains to 4-16min is incubated at 880-900 DEG C, cool down, obtain just
Fire tube valve workpiece；
3) selective hardening：To step 2) in the valve port line part of normalizing pipe valve workpiece one end that obtains be heated to 870-890 DEG C,
Cooled down in oil, the valve port line part of the other end is then heated to 870-890 DEG C, cooled down in oil, must quench pipe valve workpiece；Institute
State the portion that the outer tube wall that valve port line part is high-voltage switch gear pipe valve combined floodgate section and separating brake section coordinates with corresponding external part top pressure
Position；
4) high tempering：By step 3) the quenching pipe valve workpiece that obtains is tempered 60-90min at 490-510 DEG C, and cooling is obtained final product.
2. high-voltage switch gear pipe valve preparation method as claimed in claim 1, it is characterised in that the material of the high-voltage switch gear pipe valve
It is 20CrMnMo.
3. high-voltage switch gear pipe valve preparation method as claimed in claim 1, it is characterised in that the step 1) in be cooled to use
Stove goes out that space for collecting ashes in a stove is cold after being cooled to 830 DEG C or stove is cooled to less than 500 DEG C and comes out of the stove and carries out air cooling.
4. high-voltage switch gear pipe valve preparation method as claimed in claim 1, it is characterised in that the step 2) in heating use salt
Liquid furnace or batch-type furnace, soaking time is 4-6min when using salt bath stove heat, and soaking time is 14- when using box stove heat
16min。
5. high-voltage switch gear pipe valve preparation method as claimed in claim 1, it is characterised in that the step 2) in be cooled to
Room temperature is naturally cooled in air.
6. high-voltage switch gear pipe valve preparation method as claimed in claim 1, it is characterised in that the step 4) in be cooled to
Room temperature is naturally cooled in air.
7. a kind of using high-voltage switch gear pipe valve obtained in preparation method as claimed in claim 1.
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| CN101450440B (en) * | 2008-12-19 | 2013-10-09 | 上海诺玛液压系统有限公司 | Valve-core and valve-core cushion press-fitting processing method |
| JP2010222696A (en) * | 2009-03-25 | 2010-10-07 | Nisshin Steel Co Ltd | Quenched and tempered steel strip, and method for producing the same |
| CN102465249A (en) * | 2010-11-19 | 2012-05-23 | 沈志刚 | High-pressure resisting hard sealing manual flat valve |
| CN103233165A (en) * | 2013-04-28 | 2013-08-07 | 江苏金石铸锻有限公司 | High-pressure valve material and heat treatment method thereof |
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