CN106591559A - Postweld heat treatment process method for forge piece of motor shaft of shield pump - Google Patents
Postweld heat treatment process method for forge piece of motor shaft of shield pump Download PDFInfo
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- CN106591559A CN106591559A CN201611108240.9A CN201611108240A CN106591559A CN 106591559 A CN106591559 A CN 106591559A CN 201611108240 A CN201611108240 A CN 201611108240A CN 106591559 A CN106591559 A CN 106591559A
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- heat treatment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a postweld heat treatment process method for a shaft forge piece. No heating component is arranged in a hearth, a heated air circulation channel is formed in the side wall of the hearth, and a variable frequency high-temperature centrifugal fan drives heat to heat a workpiece. Meanwhile, a full-scale simulated part in a ratio of 1: 1 is manufactured so as to further grope and determine a novel heat treatment process through repeated tests, wherein the insulating temperature is set at 732 DEG C+14 DEG C/-28 DEG C, the insulating time is 3h, and the temperature increasing and decreasing rate is 30 DEG C/h. According to the method provided by the invention, heat treatment defects caused by improper heat treatment processes and equipment of the shaft forge piece are effectively prevented, so that the whole product piece is good in performance and quality. The achievement is of very high application value in engineering and has far-reaching social meaning. The method provided by the invention gets rid of defects such as severe oxidation of heat treatment and excessively high local temperature of the shaft force piece caused by adopting common heat treatment equipment and process method, greatly reduces the risk that the weld joint cracks, prolongs the service life of the part and increases the safety coefficient.
Description
Technical field：The present invention relates to a kind of canned motor pump electric motor shaft forgeable piece post weld heat treatment process.
Background technology：Shield electric machine is the extremely critical equipment of nuclear island of nuclear power station, and shield electric machine main pump manufactures success or not
It is directly connected to the localization rate of parts and components and the third generation AP1000 Advanced passive pressurized water reactor nuclear power station technology transfer of primary Ioops main equipment
Success or failure.Safe operation of the integrity of main pump motor to primary Ioops has important impact, wherein electric motor shaft forgeable piece paving postwelding
Be heat-treated to for main pump motor manufacture link in one technical barrier.Forging shaft material is American Society Testing and Materials
A336 TYPE403 materials (ASTM A336 TYPE403), diameter 438mm, length 5900mm, weight 7t.
Forging shaft is shielding pump motor critical component, therefore the heat treatment after its welding is also particularly important.With reference to the U.S.
Mechanical engineer's association criterion NB bundlings of volume III (ASME NB bundlings) requirement, the recommendation post weld heat treatment temperature to such material
Spend for 565 DEG C～620 DEG C, and highest post weld heat treatment temperature should be not more than 760 DEG C of its highest temperature, temperature retention time 1h/
In, often increasing 1mm temperature retention times increases 2min, and heating-cooling speed need not also be less than 56 DEG C/h.Conventional heat to such forging shaft
Handling process is：Forging shaft is heated using common well type heat treatment device, hearth outer wall hangs heated type resistor,
Heating element heater direct radiation surface of the work, and burner hearth temperature uniformity is controlled using temperature control instrument.Forging room temperature enters stove, heat treatment
Temperature is 610 DEG C ± 10 DEG C, temperature retention time 1h, 200 DEG C/h of heating-cooling speed, when workpiece temperature≤400 DEG C, air cooling of coming out of the stove；
The heating-cooling speed of more than 400 DEG C control workpiece.Because such steel it is more sensitive to heat treatment temperature, at Tai Gao or too low heat
Reason temperature has a significant impact to its mechanical property and magnetic property.Such as using above normative heat treatment equipment and technique, can be because rising
Warm speed is too fast, and workpiece size is larger, long-term in the case of the heating element heater, causes that forging shaft surface oxidation is serious, office
Portion's temperature is too high, the risk of thermal stress-cracking at increase paving weldering, while stress-removal DeGrain.To avoid forging shaft in Re Chu
Occur problem above during reason, it is necessary to using rational Technology for Heating Processing and be equipped with special Equipment for Heating Processing, can meet
The use requirement of forging shaft.
The content of the invention：It is an object of the invention to provide a kind of post weld heat treatment process of forging shaft, it is to avoid due to axle
The post weld heat treatment technique of forging and equipment are using heat treating fault caused by improper, it is ensured that whole product have good performance and
Quality.
The technical scheme is that：A kind of canned motor pump electric motor shaft forgeable piece post weld heat treatment process：(1) hot blast is adopted
Circulating well formula heat-treatment furnace carries out post weld heat treatment to electric motor shaft forgeable piece, and well formula heat-treatment furnace is not using setting heating unit in burner hearth
Part, burner hearth sidewall opens hot air circulation passage, drives heat to heat workpiece using frequency conversion high-temperature centrifugal fan；
(2) heat treatment process：Workplace vertical is placed in stove；Built-up welding aspect in workpiece two ends arranges four external thermocouples, often
Two thermocouples are arranged in juxtaposition in individual built-up welding aspect, a galvanic couple is standby when another galvanic couple fails, and thermocouple is needed and welded
Part metal is contacted, and thermocouple is welded and fixed thermocouple and uses using plug-type fixed form, the i.e. overlay surface in forging shaft
Clip, clip adopts high-temperature alloy material, thermocouple junction is inserted in clip in heat treatment process, it is ensured that thermocouple and workpiece
Surface directly contact, two position thermocouples should be at a distance of 180 °, to monitor the upper and lower solder side heat treatment process temperature of rotating shaft；
(3) Technology for Heating Processing：When workpiece enters stove, furnace temperature must not exceed 150 DEG C, the rate of heat addition：≤ 55 DEG C/h, at postwelding heat
Reason temperature range：732 DEG C+14 DEG C/- 28 DEG C, temperature retention time 1h-4h, cooldown rate:≤ 55 DEG C/h, when workpiece temperature≤315 DEG C
When, air cooling of coming out of the stove；The heating-cooling speed of more than 315 DEG C control workpiece；
(4) heat treatment method：Heat treatment is carried out to forging shaft using well formula heat-treatment furnace, is not provided with heat-treatment furnace burner hearth
Heating element heater, burner hearth sidewall opens hot air circulation passage, drives heat to heat workpiece using frequency conversion high-temperature centrifugal fan, is
Prevent oxidation and hot-spot of the forging shaft in heat treatment process, technological requirement rotating shaft from forbidding heating unit in heat treatment process
Part direct radiation surface of the work, workpiece room temperature enters stove, 30 DEG C/h of heating rate, rotation speed of fan 1300r/min, blast 2100pa,
Air quantity 65000m3/ h, 732 DEG C of+14 DEG C/- 28 DEG C+3h of holding temperature, below 30 DEG C/h to 300 DEG C of rate of temperature fall after come out of the stove sky
It is cold.
The present invention passes through to change conventional Equipment for Heating Processing, method and technological parameter, after having reached electric motor shaft forgeable piece welding
The purpose of release residual stress, meets the design use requirement of forging shaft, has broken away from because forging shaft is set using common heat treatment
Heat-treatment oxidation is serious caused by standby and process, the excessively high disadvantage of local temperature, greatly reduces the wind of commissure cracking
Danger, improves the service life and safety coefficient of part.According to ASME's standard NB bundling, (ASME NB divide
Volume) regulation technological requirement, the post weld heat treatment temperature of forging shaft material is 565 DEG C～620 DEG C, and temperature retention time is 1h, workpiece
Temperature rate between 100 DEG C/h～200 DEG C/h, burner hearth is arranged in using heating by electric cooker workpiece, i.e. resistor more than equipment
Surrounding, by heat radiation form workpiece is directly heated；Electric motor shaft forgeable piece is entered using above normative heat treatment equipment and process
After row post weld heat treatment, forging shaft surface oxidation is more serious after heat treatment, and welding stress fails thoroughly elimination, and can be because heating up
The too fast cracking for causing forging shaft to spread position at weldering of speed, is the performance for meeting product in the case, it is necessary to grope new
Technology for Heating Processing.
The present invention is adopted in burner hearth and is not provided with heating element heater, and opens hot air circulation passage in burner hearth sidewall, high using frequency conversion
Warm centrifugal blower drives heat to heat workpiece.Meanwhile, make 1：1 full-scale simulation part, through repetition test, and then touches
Rope determines new Technology for Heating Processing.That is holding temperature is set as 732 DEG C+14 DEG C/- 28 DEG C, temperature retention time 3h, temperature rate
For 30 DEG C/h.Using this kind of process broken away from because forging shaft using heat caused by common heat treatment equipment and process at
Reason oxidation is serious, the excessively high disadvantage of local temperature, greatly reduces the risk of commissure cracking, improves the service life of part
And safety coefficient.The process, is in ASME's standard NB bundlings of volume III (ASME NB bundlings) regulation
Process on the basis of, technique refinement is carried out according to the concrete size and service condition of forging shaft.The Technology for Heating Processing is
Verified on same material, the simulating piece with size, and be applied in multiple stage product, performance is good, reaches
Product Expected Results.
Description of the drawings：
Fig. 1 is forging shaft product piece structure diagram
Fig. 2 is the heat treatment cycle curve of the present invention
Fig. 3 is forging shaft post weld heat treatment practical operation temperature setting curve
Specific embodiment：
(1) Fig. 1 show forging shaft product piece structure diagram.Before heat treatment is carried out to it, it is necessary to assure equipment
Effective heating area meets the dimensional requirement of product piece；
(2) heat treatment order：Workplace vertical is placed in stove；Built-up welding aspect in workpiece two ends arranges four external thermocouples, often
It is arranged in juxtaposition two thermocouples in individual built-up welding aspect, a galvanic couple is standby when another galvanic couple fails, and thermocouple must be with
Weldment metal is contacted, and thermocouple is welded and fixed thermocouple using plug-type fixed form, the i.e. overlay surface in forging shaft
With clip, clip adopts high-temperature alloy material, by thermocouple junction insertion clip in heat treatment process, it is ensured that thermocouple and work
Part surface directly contact, two position thermocouples should be at a distance of 180 °, to monitor the upper and lower solder side heat treatment process temperature of rotating shaft；
(3) Technology for Heating Processing：As shown in Fig. 2 when workpiece enters stove, furnace temperature must not exceed 150 DEG C, the rate of heat addition：≤55℃/
H, post weld heat treatment temperature：732 DEG C+14 DEG C/- 28 DEG C, temperature retention time 1h～4h, cooldown rate:≤ 55 DEG C/h, work as workpiece temperature
When≤315 DEG C, air cooling of coming out of the stove；The heating-cooling speed of more than 315 DEG C control workpiece；
(4) heat treatment method：As shown in figure 3, postwelding heat is carried out to forging shaft using heated air circulation type well formula heat-treatment furnace
Process, heating element heater is not provided with heat treatment burner hearth, burner hearth sidewall opens hot air circulation passage, and using frequency conversion high-temperature centrifugal fan
Heat is driven to heat workpiece.Workpiece room temperature enters stove, 30 DEG C/h of heating rate, rotation speed of fan 1300r/min, blast
2100pa, air quantity 65000m3/h.732 DEG C of+14 DEG C/- 28 DEG C+3h of holding temperature, 30 DEG C/h of rate of temperature fall, workpiece temperature is down to
Come out of the stove after less than 300 DEG C air cooling.
Because forging shaft welding capacity is larger, therefore need to carry out post weld heat treatment after the completion of welding, to eliminate welding stress.Here
On the basis of need to formulate corresponding Technology for Heating Processing and adopt rational Equipment for Heating Processing with guide product production.According to the product of workpiece
Product size simultaneously combines the relevant regulations in ASME's standard to the material post weld heat treatment, technique once adopted with
Lower method carries out post weld heat treatment to it and carries out correlated performance detection, and result of the test shows, using following heat treatment method
Results of property fails the design use requirement for meeting product, therefore need to change Technology for Heating Processing, and relevant information is as follows：
Embodiment 1：Forging shaft is heated using heated air circulation type well formula heat-treatment furnace, holding temperature be 732 DEG C ±
10 DEG C, temperature retention time 2h.Circulating fan rotating speed is adjusted to 1000r/min, air quantity 50000m3/ h, other Technologies for Heating Processing are constant.Adopt
With this kind of Technology for Heating Processing, when result of the test shows that fire box temperature reaches 732 DEG C, workpiece temperature is 714 DEG C, and through 1.5h
Afterwards workpiece has just enter into insulation interval, and using this kind of Technology for Heating Processing, welding residual stress is all eliminated, but heat treatment cycle curve is not
Meet process stipulation requirement.
Claims (1)
1. a kind of canned motor pump electric motor shaft forgeable piece post weld heat treatment process, is characterized in that：
(1) post weld heat treatment is carried out to electric motor shaft forgeable piece using heated air circulation type well formula heat-treatment furnace, well formula heat-treatment furnace is adopted
Heating element heater is not set in burner hearth, burner hearth sidewall opens hot air circulation passage, heat is driven to workpiece using frequency conversion high-temperature centrifugal fan
Heated；
(2) heat treatment process：Workplace vertical is placed in stove；Built-up welding aspect in workpiece two ends arranges four external thermocouples, each heap
Two thermocouples are arranged in juxtaposition on layer face, a galvanic couple is standby when another galvanic couple fails, and thermocouple is needed and weldment gold
Category contact, thermocouple is welded and fixed thermocouple clip using plug-type fixed form, the i.e. overlay surface in forging shaft,
Clip adopts high-temperature alloy material, thermocouple junction is inserted in clip in heat treatment process, it is ensured that thermocouple and surface of the work
Directly contact, two position thermocouples should be at a distance of 180 °, to monitor the upper and lower solder side heat treatment process temperature of rotating shaft；
(3) Technology for Heating Processing：When workpiece enters stove, furnace temperature must not exceed 150 DEG C, the rate of heat addition：≤ 55 DEG C/h, post weld heat treatment temperature
Degree scope：732 DEG C+14 DEG C/- 28 DEG C, temperature retention time 1h-4h, cooldown rate:≤ 55 DEG C/h, when workpiece temperature≤315 DEG C,
Come out of the stove air cooling；The heating-cooling speed of more than 315 DEG C control workpiece；
(4) heat treatment method：Heat treatment is carried out to forging shaft using well formula heat-treatment furnace, heating is not provided with heat-treatment furnace burner hearth
Element, burner hearth sidewall opens hot air circulation passage, drives heat to heat workpiece using frequency conversion high-temperature centrifugal fan, to prevent
Oxidation and hot-spot of the forging shaft in heat treatment process, technological requirement rotating shaft forbids heating element heater straight in heat treatment process
Radiation surface of the work is connect, workpiece room temperature enters stove, 30 DEG C/h of heating rate, rotation speed of fan 1300r/min, blast 2100pa, air quantity
65000m3/ h, 732 DEG C of+14 DEG C/- 28 DEG C+3h of holding temperature, below 30 DEG C/h to 300 DEG C of rate of temperature fall after come out of the stove air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611108240.9A CN106591559A (en) | 2016-12-06 | 2016-12-06 | Postweld heat treatment process method for forge piece of motor shaft of shield pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611108240.9A CN106591559A (en) | 2016-12-06 | 2016-12-06 | Postweld heat treatment process method for forge piece of motor shaft of shield pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106591559A true CN106591559A (en) | 2017-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611108240.9A Pending CN106591559A (en) | 2016-12-06 | 2016-12-06 | Postweld heat treatment process method for forge piece of motor shaft of shield pump |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2804116Y (en) * | 2005-07-26 | 2006-08-09 | 南京年达炉业科技有限公司 | Well type tempering furnace |
| CN102114597A (en) * | 2009-12-30 | 2011-07-06 | 江苏金源锻造股份有限公司 | Forge welding method for manufacturing wind power main shaft |
| CN102213544A (en) * | 2011-05-10 | 2011-10-12 | 丽水市华一自动化技术有限公司 | Tempering furnace |
| CN103817414A (en) * | 2014-02-17 | 2014-05-28 | 哈尔滨电气动力装备有限公司 | Tungsten electrode argon arc hot wire surfacing technique of main pump motor shaft and flywheel |
| CN105200197A (en) * | 2015-10-20 | 2015-12-30 | 江苏邦泰炉业有限公司 | Well-type tempering furnace |
| CN105463176A (en) * | 2015-12-02 | 2016-04-06 | 哈尔滨电气动力装备有限公司 | Shell flange postweld heat treatment process method |
| CN106148882A (en) * | 2016-08-18 | 2016-11-23 | 桥运精密部件（苏州）有限公司 | A kind of quenching technical of miniature electrical machinery axle |
-
2016
- 2016-12-06 CN CN201611108240.9A patent/CN106591559A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2804116Y (en) * | 2005-07-26 | 2006-08-09 | 南京年达炉业科技有限公司 | Well type tempering furnace |
| CN102114597A (en) * | 2009-12-30 | 2011-07-06 | 江苏金源锻造股份有限公司 | Forge welding method for manufacturing wind power main shaft |
| CN102213544A (en) * | 2011-05-10 | 2011-10-12 | 丽水市华一自动化技术有限公司 | Tempering furnace |
| CN103817414A (en) * | 2014-02-17 | 2014-05-28 | 哈尔滨电气动力装备有限公司 | Tungsten electrode argon arc hot wire surfacing technique of main pump motor shaft and flywheel |
| CN105200197A (en) * | 2015-10-20 | 2015-12-30 | 江苏邦泰炉业有限公司 | Well-type tempering furnace |
| CN105463176A (en) * | 2015-12-02 | 2016-04-06 | 哈尔滨电气动力装备有限公司 | Shell flange postweld heat treatment process method |
| CN106148882A (en) * | 2016-08-18 | 2016-11-23 | 桥运精密部件（苏州）有限公司 | A kind of quenching technical of miniature electrical machinery axle |
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Application publication date: 20170426 |
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