CN105154630A - High-tension switch pipe valve preparation method and high-tension switch pipe valve - Google Patents
High-tension switch pipe valve preparation method and high-tension switch pipe valve Download PDFInfo
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- CN105154630A CN105154630A CN201510577358.5A CN201510577358A CN105154630A CN 105154630 A CN105154630 A CN 105154630A CN 201510577358 A CN201510577358 A CN 201510577358A CN 105154630 A CN105154630 A CN 105154630A
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Abstract
The invention relates to a high-tension switch pipe valve preparation method and a high-tension switch pipe valve and belongs to the technical field of thermal treatment. The high-tension switch pipe valve preparation method comprises the following steps: carburizing high-tension switch pipe valve workblank at 910-930 DEG C to form a carburizing layer, and cooling the carburizing layer to obtain a carburized pipe valve workpiece; heating the obtained carburized pipe valve workpiece to 880-900 DEG C, preserving heat for 4-16 minutes, and cooling the heated carburized pipe valve workpiece to obtain a normalizing pipe valve workpiece; heating valve port line parts at two ends of the obtained normalizing pipe valve workpiece to 870-890 DEG C, cooling the heated normalizing pipe valve workpiece in oil to obtain a quenching pipe valve workpiece; tempering the obtained quenching pipe valve workpiece for 60-90 minutes under 490-510 DEG C, and cooling the tempered quenching pipe valve workpiece to obtain the high-tension switch pipe valve. The high-tension switch pipe valve preparation method meets the reliability requirement on the high-tension switch pipe valve; the high-tension switch pipe valve can ensure normal operation of a high-tension switch hydraulic mechanism and is flexible in operation, and switching off/on in place is ensured.
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 the chemical heat treatment process extensively adopted in machine building industry, mainly be applicable to the equipment part of taking up wear, alternation contact stress or stress in bending and shock load, as parts such as gear, support, wrist pins, especially apply comparatively general in vehicle, device fabrication industry.Carburization process refers to that steel-iron components heats and is incubated in carburizing medium, makes carbon atom infiltrate piece surface, increases the carbon content on steel-iron components top layer, and obtain a kind of chemical heat treatment process of certain carbon profile.The object of carburizing obtains high carbon content on the surface of soft steel or low-carbon alloy steel part, and through quenching, after tempering, make piece surface obtain high hardness and wear resistance, and the centre of part still keeps certain intensity and higher plasticity and toughness.
Manufacture field at high-voltage switch gear, carburization process also has certain application.Pipe valve is a vital part on high-voltage switch gear hydraulic gear, high-voltage switch gear pipe valve is tubular structure, comprise middle pipeline section, middle pipeline section one end is connected with combined floodgate section, the other end is connected with a point lockage chamber, the outer tube wall diameter of combined floodgate section is greater than middle pipeline section outer tube wall diameter, and the outer tube wall diameter of point lockage chamber is less than middle pipeline section pipe outer diameter.During specific works, under the effect of high-pressure oil, pipe valve moves along axis as reciprocating impact in valve body.This just requires that pipe valve has certain wear resistance, and inclined-plane, two ends valve port potted line (valve port line) be in strong shock action must not deformed depression or fall slag cracking, enough intensity, hardness and fatigue resistance must be had, require that again the core of pipe valve should keep certain intensity and good toughness simultaneously.
In the prior art, in order to improve the reliability of high-voltage switch gear pipe valve, generally carburizing, quenching, low-temperaturetempering process are carried out to pipe valve.Pipe valve carburized surface hardness after process is between 55 ~ 60HRC, and matrix hardness is between 39 ~ 45HRC.But, after the pipe valve application on-board the circuit breaker that this carburizing is heat treated, be easy to pipe valve distortion, CRACKING ACCIDENT occur at run duration.Its reason may be, this pipe valve is a kind of thin-walled parts, thinnest part is thick 2mm only, after above-mentioned thermal treatment, although it is surperficial and matrix hardness is higher, there is higher intensity, but the impact load stress concentration that bears of two ends valve port line place is comparatively large at work due to pipe valve, point, closing a floodgate to run only just there will be valve port line depression for more than 200 times and to broaden even local bursting crack, distortion and cause oil leakage phenomenon.
Summary of the invention
The object of the present invention is to provide a kind of high-voltage switch gear pipe valve preparation method, easily cave in solve prior art high-voltage switch pipe valve sealing valve port line place, be out of shape or the problem of local bursting crack.The present invention also aims to the high-voltage switch gear pipe valve that a kind of aforesaid method process is provided.
In order to realize above object, the technical scheme of high-voltage switch gear pipe valve preparation method of the present invention is as follows:
A kind of high-voltage switch gear pipe valve preparation method, comprises the steps:
1) carburizing: high-voltage switch gear pipe valve blank is carried out carburizing at 910-930 DEG C and forms cementation zone, cooling, obtains carburizing pipe valve workpiece;
2) normalizing: by step 1) in the carburizing pipe valve workpiece heat that obtains at 880-900 DEG C, be incubated 4-16min, cooling, obtains 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, cool in oil, then the valve port line part of the other end is heated to 870-890 DEG C, cools in oil, must quench pipe valve workpiece;
4) high tempering: by step 3) the quenching pipe valve workpiece that obtains is at 490-510 DEG C of tempering 60-90min, and cooling, to obtain final product.
High-voltage switch gear pipe valve preparation method of the present invention carries out selective hardening to the valve port line position of the outer tube wall at pipe valve two ends after carburizing and normalizing, improve the hardness at above-mentioned position, intensity and wear resistance, and the outer tube wall of pipe valve middle part is not quenched, while making it keep certain hardness, also maintain higher toughness, the depression that the valve port line place of the outer tube wall and middle part outer tube wall intersection that avoid pipe valve two ends occurs stress concentration and causes, distortion and Fragmentation Phenomena, avoid the generation of oil leakage phenomenon, ensure that the normal divide-shut brake of high-voltage switch gear pipe valve, improve the reliability in its military service process.
Described high-voltage switch gear pipe valve is tubular structure, comprise middle pipeline section, middle pipeline section one end is connected with combined floodgate section, and the other end is connected with a point lockage chamber, the outer tube wall diameter of combined floodgate section is greater than middle pipeline section outer tube wall diameter, and the outer tube wall diameter of point lockage chamber is less than middle pipeline section pipe outer diameter.Described valve port line part is high-voltage switch gear pipe valve combined floodgate section and point outer tube wall of lockage chamber and the position of corresponding external parts top press-fit.
Described 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, concrete, within the time can be controlled in 10s, as 8-10s.
The material of described high-voltage switch gear pipe valve adopts the trade mark to be the steel of 20CrMnMo, and its mass percent consists of: the Si of the C of 0.17%-0.23%, 0.17%-0.37%, the Mn of 0.90%-1.20%, the Mo of the Cr of 1.10%-1.40%, 0.20%-0.30%, surplus is Fe.
Described high-voltage switch gear pipe valve blank is the high-voltage switch gear pipe valve blank processed according to above-mentioned materials blanking rear car.In order to ensure that pipe valve workpiece still can keep certain depth of case, described step 1 after polishing processing) the outer tube wall of high-voltage switch gear pipe valve blank have and stay mill amount, described in stay mill amount to be less than the thickness of described cementation zone.
Preferably, described step 1) in the thickness of cementation zone be 0.9-1.1mm, described step 1) the outer tube wall of high-voltage switch gear pipe valve blank there is 0.2-0.3mm stay mill amount.Like this after forming process, the thickness of cementation zone remains on 0.6-0.9mm.
In order to remove the material of pipe valve excess surface, make pipe valve shaping, described step 1) in the carburizing pipe valve workpiece that obtains carry out normalizing before carry out machine-shaping, grind off and stay mill amount.
Described step 1) in cooling adopt stove to be chilled to 830 DEG C after go out the cold or stove of space for collecting ashes in a stove and be chilled to less than 500 DEG C and come out of the stove and carry out air cooling.
Described step 1) in carburizing can adopt method for carburizing of the prior art, general, use case-hardening furnace or pit carburizing furnace to carry out carburizing treatment.
In order to ensure the effect of normalizing, soaking time is different according to different type of heating, described step 2) in heating adopt salt bath furnace or box-type furnace, when adopting salt bath furnace heating, soaking time is 4-6min, and when adopting box-type furnace heating, soaking time is 14-16min; Preferably, described step 4) in when adopting salt bath furnace heating soaking time be 5min, when adopting box-type furnace heating, soaking time is 15min.
Described step 2) in be cooled to and naturally cool to room temperature in atmosphere.
Described step 4) in be cooled to and naturally cool to room temperature in atmosphere.
The technical scheme of high-voltage switch gear pipe valve of the present invention is as follows:
A kind of high-voltage switch gear pipe valve adopting above-mentioned preparation method to obtain.
The high-voltage switch gear pipe valve two ends valve port line part surface hardness of high-voltage switch gear pipe valve preparation method of the present invention process is higher, between 45-50HRC, meets its requirement to wear resistance, and intervalve section surface hardness, between 37-43HRC, has necessary intensity; And the matrix hardness at non-carburizing position controls between 23-32HRC, toughness requirements can be met.Namely the selective hardening part after carburizing has higher hardness, intensity and wear resistance, and the part of quenching that do not have after carburizing has higher toughness while having enough hardness and intensity, give full play to material potential, make pipe valve can not produce brittle cracking when shock motion, cause leakage of oil and impact to voltage switch point, combined floodgate performance.Meet the reliability requirement of high-voltage switch gear pipe valve, the normal work of high-voltage switch gear hydraulic gear can be guaranteed, flexible operation, divide, closing a floodgate puts in place.
Accompanying drawing explanation
Fig. 1 is the structural representation of the carburizing blank of the high-voltage switch gear pipe valve of comparative example of the present 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 shaping workpiece structure and the selective hardening position view of the high-voltage switch gear pipe valve of embodiments of the invention 1.
Embodiment
Below by specific embodiment, technical scheme of the present invention is further described.
Embodiment 1
The high-voltage switch gear pipe valve preparation method of the present embodiment comprises the steps:
1) blank processing: by the blanking of high-voltage switch gear pipe valve, the concrete composition of material therefor, in table 1, goes out high-voltage switch gear pipe valve blank according to the Vehicle Processing of structure shown in Fig. 2, and the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount to be 0.3mm;
Table 1
2) carburizing: by step 1) in the high-voltage switch gear pipe valve blank that obtains adopt case-hardening furnace to carry out carburizing at 910 DEG C, cementation zone is formed at injectron valve surface, depth of case is 0.9mm, and hole of carrying out after then stove is chilled to 830 DEG C coming out of the stove is chilled 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;
Described high-voltage switch gear pipe valve is tubular structure, comprise middle pipeline section 1, middle pipeline section one end is connected with point lockage chamber 2, and the other end is connected with combined floodgate section 3, the outer tube wall diameter of combined floodgate section is greater than middle pipeline section outer tube wall diameter, and the outer tube wall diameter of point lockage chamber is less than middle pipeline section pipe outer diameter.
4) normalizing: by step 3) in the shaping pipe valve workpiece that obtains adopt salt bath furnace to be heated to 900 DEG C, insulation 5min, naturally cools to room temperature in atmosphere, obtains normalizing pipe valve workpiece;
5) selective hardening: by step 4) the normalizing pipe valve workpiece that obtains is placed on high-frequency induction heating apparatus, the valve port line part aligning the outer tube wall of fire tube valve workpiece one end is heated to 890 DEG C in 10s, cool in oil, then the valve port line part of the other end is heated to 890 DEG C in 10s, cool in oil, must quench pipe valve workpiece; Described valve port line part is high-voltage switch gear pipe valve combined floodgate section and point outer tube wall of lockage chamber and the position of corresponding external parts top press-fit, specifically as shown in A and B place dotted line part in Fig. 3;
6) high tempering: by step 5) in the quenching pipe valve workpiece that obtains adopt box-type furnace tempering 90min at 490 DEG C, naturally cool to room temperature in atmosphere, fine grinding, to obtain final product.
The high-voltage switch gear pipe valve adopting aforesaid method to obtain is the high-voltage switch gear pipe valve of the present embodiment.
Embodiment 2
The high-voltage switch gear pipe valve preparation method of the present embodiment comprises the steps:
1) blank processing: by the blanking of high-voltage switch gear pipe valve, the concrete composition of material therefor, in table 1, goes out high-voltage switch gear pipe valve blank according to the mode Vehicle Processing identical with embodiment 1, and the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount to be 0.2mm;
2) carburizing: by step 1) in the high-voltage switch gear pipe valve blank that obtains adopt pit carburizing furnace to carry out carburizing at 930 DEG C, cementation zone is formed at injectron valve surface, depth of case is 1.1mm, and then stove is come out of the stove after being chilled to 500 DEG C and carried out air cooling 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 the mode identical with embodiment 1;
4) normalizing: by step 3) in the shaping pipe valve workpiece that obtains adopt box-type furnace to be heated to 880 DEG C, insulation 15min, naturally cools to room temperature in atmosphere, obtains normalizing pipe valve workpiece;
5) selective hardening: by step 4) the normalizing pipe valve workpiece that obtains is placed on high-frequency induction heating apparatus, the valve port line part aligning the outer tube wall of fire tube valve workpiece one end is heated to 870 DEG C in 8s, cool in oil, then the valve port line part of the other end is heated to 870 DEG C in 8s, cool in oil, must quench pipe valve workpiece; This valve port line part, with embodiment 1, is then cooled to room temperature in oil, and must quench pipe valve workpiece;
6) high tempering: by step 5) in the quenching pipe valve workpiece that obtains adopt pit furnace tempering 60min at 510 DEG C, naturally cool to room temperature in atmosphere, fine grinding, to obtain final product.
The high-voltage switch gear pipe valve adopting aforesaid method to obtain is the high-voltage switch gear pipe valve of the present embodiment.
Embodiment 3
The high-voltage switch gear pipe valve preparation method of the present embodiment comprises the steps:
1) blank processing: by the blanking of high-voltage switch gear pipe valve, the concrete composition of material therefor, in table 1, goes out high-voltage switch gear pipe valve blank according to the mode Vehicle Processing identical with embodiment 1, and the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount to be 0.25mm;
2) carburizing: by step 1) in the high-voltage switch gear pipe valve blank that obtains adopt pit carburizing furnace to carry out carburizing at 920 DEG C, cementation zone is formed at injectron valve surface, depth of case is 1.0mm, and then stove is come out of the stove after being chilled to 500 DEG C and carried out air cooling 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 the mode identical with embodiment 1;
4) normalizing: by step 3) in the shaping pipe valve workpiece that obtains adopt salt bath furnace to be heated to 890 DEG C, insulation 4min, naturally cools to room temperature in atmosphere, obtains normalizing pipe valve workpiece;
5) selective hardening: by step 4) the normalizing pipe valve workpiece that obtains is placed on high-frequency induction heating apparatus, the valve port line part aligning the outer tube wall of fire tube valve workpiece one end is heated to 880 DEG C in 9s, cool in oil, then the valve port line part of the other end is heated to 880 DEG C in 9s, cool in oil, must quench pipe valve workpiece; This valve port line anti-wear component, with embodiment 1, is then cooled to room temperature in oil, and must quench pipe valve workpiece;
6) high tempering: by step 5) in the quenching pipe valve workpiece that obtains adopt pit furnace tempering 70min at 500 DEG C, naturally cool to room temperature in atmosphere, fine grinding, to obtain final product.
The high-voltage switch gear pipe valve adopting aforesaid method to obtain is the high-voltage switch gear pipe valve of the present embodiment.
Embodiment 4
The high-voltage switch gear pipe valve preparation method of the present embodiment comprises the steps:
1) blank processing: by the blanking of high-voltage switch gear pipe valve, the concrete composition of material therefor, in table 2, goes out high-voltage switch gear pipe valve blank according to the mode Vehicle Processing identical with embodiment 1, and the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount to be 0.25mm;
Table 2
2) carburizing: by step 1) in the high-voltage switch gear pipe valve blank that obtains adopt pit carburizing furnace to carry out carburizing at 920 DEG C, cementation zone is formed at injectron valve surface, depth of case is 1.0mm, carries out coming out of the stove air cooling to room temperature after then stove is chilled to 500 DEG C, obtains carburizing pipe valve workpiece;
3) normalizing: by step 2) in the carburizing pipe valve workpiece that obtains adopt salt bath furnace to be heated to 880 DEG C, insulation 6min, naturally cools to room temperature in atmosphere, obtains normalizing pipe valve workpiece;
4) selective hardening: by step 3) the normalizing pipe valve workpiece that obtains is placed on high-frequency induction heating apparatus, the valve port line part aligning the outer tube wall of fire tube valve workpiece one end is heated to 880 DEG C in 9s, cool in oil, then the valve port line part of the other end is heated to 880 DEG C in 9s, cool in oil, must quench pipe valve workpiece; This valve port line part, with embodiment 1, is then cooled to room temperature in oil, and must quench pipe valve workpiece;
5) high tempering: by step 4) in the quenching pipe valve workpiece that obtains adopt pit furnace tempering 70min at 500 DEG C, naturally cool to room temperature in atmosphere, fine grinding, to obtain final product.
The high-voltage switch gear pipe valve adopting aforesaid method to obtain is the high-voltage switch gear pipe valve of the present embodiment.
Comparative example
The high pressure pipe valve heat treating method of the present embodiment comprises the steps:
1) blank processing: by the blanking of high-voltage switch gear pipe valve, the concrete composition of material therefor, in table 1, goes out high-voltage switch gear pipe valve blank according to the Vehicle Processing of structure shown in Fig. 1, and the outer tube wall of high-voltage switch gear pipe valve blank stays mill amount to be 0.3mm;
2) carburizing: by step 1) in the high-voltage switch gear pipe valve blank that obtains adopt case-hardening furnace to carry out carburizing at 910 DEG C, cementation zone is formed at injectron valve surface, depth of case is 0.9mm, and hole of carrying out after then stove is chilled to 830 DEG C coming out of the stove is chilled 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 the mode identical with embodiment 1;
4) quench: by step 3) in the shaping pipe valve workpiece that obtains adopt box-type furnace to be heated to 860 DEG C, insulation 15min, then in oil, be cooled to room temperature, must quench pipe valve workpiece;
5) tempering: by step 4) in the quenching pipe valve workpiece that obtains adopt box-type furnace tempering 120min at 200 DEG C, naturally cool to room temperature in atmosphere, fine grinding, to obtain final product.
The high-voltage switch gear pipe valve adopting aforesaid method to obtain is the high-voltage switch gear pipe valve of this comparative example.
Experimental example
To its hardness of injectron valve test adopting embodiment 1-4 and comparative example finally to obtain and serviceability, concrete outcome is in table 3.
Injectron valve test result heat treated in table 3 embodiment 1-4 and comparative example
The high-voltage switch gear pipe valve of method process of the present invention finds through mechanical endurance test test, no matter be in rated oil pressure, voltage rating, or at high oil pressure, high-voltage, or to carry out under the condition such as low oil pressure, low voltage point, closing operation, divide, closing a floodgate puts in place flexibly, pipe valve situation without exception, mechanism's ne-leakage phenomenon, heap depression do not beaten by valve port line and Fragmentation Phenomena occurs, and meets the performance requriements that hydraulic gear is on active service completely.
Heat treating method multiplicity of the present invention is high, is easy to production operation, and part quality is stablized, safe and reliable in process under arms, and can guarantee normal point of high-voltage switch gear hydraulic gear, combined floodgate work, economic benefits comparison is remarkable.
Claims (10)
1. a high-voltage switch gear pipe valve preparation method, is characterized in that, comprises the steps:
1) carburizing: high-voltage switch gear pipe valve blank is carried out carburizing at 910-930 DEG C and forms cementation zone, cooling, obtains carburizing pipe valve workpiece;
2) normalizing: by step 1) in the carburizing pipe valve workpiece heat that obtains at 880-900 DEG C, be incubated 4-16min, cooling, obtains 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, cool in oil, then the valve port line part of the other end is heated to 870-890 DEG C, cools in oil, must quench pipe valve workpiece;
4) high tempering: by step 3) the quenching pipe valve workpiece that obtains is at 490-510 DEG C of tempering 60-90min, and cooling, to obtain final product.
2. high-voltage switch gear pipe valve preparation method as claimed in claim 1, it is characterized in that, the material of described high-voltage switch gear pipe valve is 20CrMnMo.
3. high-voltage switch gear pipe valve preparation method as claimed in claim 1, is characterized in that, described step 1) the outer tube wall of high-voltage switch gear pipe valve blank have and stay mill amount, described in stay mill amount to be less than the thickness of described cementation zone.
4. high-voltage switch gear pipe valve preparation method as claimed in claim 3, is characterized in that, described step 1) in the mill amount of staying of outer tube wall of high-voltage switch gear pipe valve blank be 0.2-0.3mm, the thickness of described cementation zone is 0.9-1.1mm.
5. high-voltage switch gear pipe valve preparation method as claimed in claim 4, is characterized in that, described step 1) in the carburizing pipe valve workpiece that obtains carry out normalizing before carry out machine-shaping.
6. high-voltage switch gear pipe valve preparation method as claimed in claim 1, is characterized in that, described step 1) in be cooled to adopt stove to be chilled to 830 DEG C after go out the cold or stove of space for collecting ashes in a stove and be chilled to less than 500 DEG C and come out of the stove and carry out air cooling.
7. high-voltage switch gear pipe valve preparation method as claimed in claim 1, it is characterized in that, described step 2) in heating adopt salt bath furnace or box-type furnace, when adopting salt bath furnace heating, soaking time is 4-6min, and when adopting box-type furnace heating, soaking time is 14-16min.
8. high-voltage switch gear pipe valve preparation method as claimed in claim 1, is characterized in that, described step 2) in be cooled to and naturally cool to room temperature in atmosphere.
9. high-voltage switch gear pipe valve preparation method as claimed in claim 1, is characterized in that, described step 4) in be cooled to and naturally cool to room temperature in atmosphere.
10. the high-voltage switch gear pipe valve adopting preparation method as claimed in claim 1 to obtain.
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| CN201510577358.5A CN105154630B (en) | 2015-09-11 | 2015-09-11 | A kind of high-voltage switch gear pipe valve preparation method and high-voltage switch gear pipe valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106119768A (en) * | 2016-06-19 | 2016-11-16 | 贵州高峰石油机械股份有限公司 | A kind of processing method of slips |
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| 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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| CN101450440A (en) * | 2008-12-19 | 2009-06-10 | 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 |
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