CN112809397A - Pump shaft machining device and method for high-temperature concentrated sulfuric acid submerged pump - Google Patents
Pump shaft machining device and method for high-temperature concentrated sulfuric acid submerged pump Download PDFInfo
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- CN112809397A CN112809397A CN202010338960.4A CN202010338960A CN112809397A CN 112809397 A CN112809397 A CN 112809397A CN 202010338960 A CN202010338960 A CN 202010338960A CN 112809397 A CN112809397 A CN 112809397A
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- shaft
- temperature
- slender
- sulfuric acid
- concentrated sulfuric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/06—Metal-working plant comprising a number of associated machines or apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
Abstract
A high temperature concentrated sulfuric acid submerged pump shaft processingequipment includes the three-jaw from centering chuck, the first center frame and the second center frame that support slender axles that are used for centre gripping slender axles blank one end, processingequipment still includes the follow rest, lathe tool and the rotatable triangle chuck of centre gripping slender axles that are located between first center frame and the second center frame, and the processing method mainly has following step: blanking, preprocessing, solutionizing, rough turning, UT nondestructive testing, low-temperature internal stress relief, fine turning, milling, grinding and PT soaking nondestructive testing. After the processing device and the process flow are adopted, the rejection rate of the slender shaft of the high-temperature concentrated sulfuric acid pump in the machining process can be effectively reduced, and the high-precision processing of the slender shaft is improved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of chemical equipment, in particular to a device and a method for processing a pump shaft of a high-temperature concentrated sulfuric acid submerged pump.
[ background of the invention ]
The high-temperature concentrated sulfuric acid submerged pump is mainly used for conveying high-temperature concentrated sulfuric acid media and is compatible with all other application fields of submerged pumps, the length of a pump shaft of the high-temperature concentrated sulfuric acid submerged pump is larger than 3000mm, the length-to-diameter ratio of the pump shaft is larger than 25, and the high-temperature concentrated sulfuric acid submerged pump belongs to a slender shaft and a flexible shaft. Due to the fact that the slender shaft is poor in rigidity, cutting force and cutting heat generate stress in the machining process, vibration and bending deformation are easy to generate, machining difficulty is greatly increased, machining precision is difficult to guarantee, and the rejection rate of the shaft is increased. The pump shaft of the high-temperature concentrated sulfuric acid pump is made of 310S (06Cr25Ni20) material, the chemical components of the pump shaft are Cr (24% -26%), Ni (19% -22%), Si (less than or equal to 1.5%), Mn (less than or equal to 2%), 310S (06Cr25Ni20) austenitic chromium-nickel stainless steel has good creep strength due to high Cr and Ni content, and the 310S material has good corrosion resistance, oxidation resistance, high temperature resistance and acid and alkali resistance and meets the working characteristics of the pump shaft of the high-temperature concentrated sulfuric acid submerged pump. Therefore, the 310S stainless steel bar forging material is used for producing and processing the pump shaft of the high-temperature concentrated sulfuric acid submerged pump. Because the length of the pump shaft of the high-temperature concentrated sulfuric acid submerged pump is more than 3000mm, and the length-to-diameter ratio of the pump shaft is more than 25, the material not only needs to be used as the particularity of the material of the pump shaft of the high-temperature concentrated sulfuric acid submerged pump, but also solves the problems of poor rigidity, easy deformation and difficult processing.
Therefore, the problem to be solved in the field is to provide a device and a method for processing a pump shaft of a high-temperature concentrated sulfuric acid submerged pump.
[ summary of the invention ]
Aiming at the problems, the pump shaft processing device and the processing method of the high-temperature concentrated sulfuric acid submerged pump can effectively reduce the rejection rate of the long and thin shaft of the high-temperature concentrated sulfuric acid submerged pump in the machining process and improve the high-precision processing of the long and thin shaft.
In order to solve the problems, the pump shaft processing device of the high-temperature concentrated sulfuric acid submerged pump comprises a three-jaw self-centering chuck for clamping one end of a slender shaft blank, a first center frame and a second center frame for supporting the slender shaft, a follow rest, a turning tool and a rotatable triangular chuck for clamping the slender shaft, wherein the follow rest, the turning tool and the rotatable triangular chuck are positioned between the first center frame and the second center frame.
Furthermore, the first center frame and the second center frame are both connected with cooling liquid pipes.
Furthermore, the rotatable triangular chuck comprises an ejector pin, a circular base, a bearing, a disc and a triangular chuck.
Further, the method for processing the pump shaft of the high-temperature concentrated sulfuric acid submerged pump comprises the following steps:
the first process step: blanking, cutting a forging round bar material made of 310S (06Cr25Ni20) material as a blank material of the slender shaft 2 according to a blanking size diagram, and reserving a certain length allowance according to the blanking size diagram.
And a second step: preprocessing, namely clamping the slender shaft blank to be processed according to a preprocessing sequence diagram.
And a third step of: the solid solution treatment is carried out in a shaft furnace according to the 310S (06Cr25Ni20 shaft material solid solution treatment process.
Step four: rough turning, according to the rough turning process, a slender shaft is clamped by using a three-jaw self-centering chuck and two center frames in a main shaft box, cooling liquid enters the center frames through cooling liquid pipes, heat generated by friction between a center frame adjusting screw rod and the slender shaft is taken away, stress generated by friction heat and cutting heat can be effectively avoided, and the bending deformation degree of the slender shaft in the machining process is reduced.
And a fifth step: internal stress is eliminated at low temperature, and the internal stress is eliminated at low temperature in a shaft furnace according to a heat treatment process for eliminating the internal stress at low temperature of 310S (06Cr25Ni20 shaft material).
A sixth procedure: and UT nondestructive testing, ultrasonic testing is carried out on the slender shaft, and whether the internal structure of the shaft is damaged or not is checked.
A seventh step: finish turning, according to the process of the finish turning procedure, a movable thimble and a machine tool spindle are used for clamping the slender shaft in a mode that the three-jaw self-centering chuck clamps one top by one top, and the excircles at the head parts of two ends of the axle are used as the reference of the finish axle.
And eighth step: milling, namely clamping and leveling the slender shaft on a milling machine according to a milling process, and milling key grooves in all positions on the shaft to meet the size requirement. Care should be taken to prevent bending deformation of the shaft when milling the keyway.
The ninth procedure: and (3) fine grinding, namely clamping and aligning the slender shaft on a horizontal grinding machine according to a fine grinding process, wherein all outer diameters of the slender shaft are ground to the final size, the jumping tolerance of the shaft meets the requirement, and the rotating speed and the feed amount are strictly controlled.
A tenth step: PT nondestructive testing, carrying out PT soaking flaw detection on the slender shaft, and checking whether the surface structure of the shaft is damaged or not.
Furthermore, in the second procedure, according to a preprocessing procedure diagram, at the step position of the shaft, the direct transition of right angle needs to be avoided, and the transition is processed by oblique angle.
Further, the shaft should be heat-treated in a vertically suspended state during the heat treatment in the third step, and at least one calibrated contact thermocouple is installed at the middle position of the shaft to ensure the validity of temperature reading.
Furthermore, in the third working procedure, the temperature of the furnace is less than or equal to 200 ℃, the temperature is increased to 1050 +/-10 ℃ at the speed of 120 ℃/h, the temperature is kept for 2h, the furnace is taken out and water-cooled after the heat preservation process is finished, the time for transferring the shaft from the furnace to the water quenching tank is less than 60 seconds, and the temperature of the water cooling tank cannot exceed 50 ℃ at any stage in the heat treatment process.
Furthermore, in the fifth step, the temperature of the furnace is less than or equal to 150 ℃, the temperature is increased to 250-300 ℃ at the speed of 150 ℃/h, the temperature is kept for 2h, and after the heat preservation process is finished, the steel plate is taken out of the furnace and vertically suspended for uniform air cooling.
Moreover, the processing device and the processing method for the pump shaft of the high-temperature concentrated sulfuric acid submerged pump can effectively reduce the rejection rate of the long and thin shaft of the high-temperature concentrated sulfuric acid submerged pump in the machining process and improve the high-precision processing of the long and thin shaft.
[ description of the drawings ]
FIG. 1 is a schematic view of clamping of a slender shaft in the high-temperature concentrated sulfuric acid submerged pump shaft processing device and the processing method.
Fig. 2 is a schematic structural diagram of a center frame in the high-temperature concentrated sulfuric acid submerged pump shaft processing device and the processing method of the invention.
Fig. 3 is a schematic structural diagram of a rotatable triangular chuck in the device and the method for processing the pump shaft of the high-temperature concentrated sulfuric acid submerged pump according to the present invention.
[ detailed description ] embodiments
The directional terms of the present invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc., are only directions in the drawings, and are only used to explain and illustrate the present invention, but not to limit the scope of the present invention.
Referring to fig. 1 to 3, the components of the processing device in the high-temperature concentrated sulfuric acid submerged pump shaft processing device and the processing method of the invention are shown, and the processing device comprises a three-jaw self-centering chuck 1 for clamping one end of a slender axle blank, a first central frame 2 and a second central frame 3 for supporting the slender axle blank, and a cooling liquid pipe 201 is connected on the central frames. The processing device further comprises a follow rest 4 and a turning tool 5 which are positioned between the first center frame and the second center frame, the other end of the slender shaft blank is clamped tightly through a rotatable triangular chuck 6, and the rotatable triangular chuck comprises a thimble a, a circular base b, a bearing c, a disc d and a triangular chuck e.
The method for processing the pump shaft of the high-temperature concentrated sulfuric acid submerged pump mainly comprises the following working procedures;
the first process step: discharging
And cutting a 310S (06Cr25Ni20) forged round bar material as a blank material of the slender shaft 2 according to the blanking size diagram, and reserving a certain length allowance according to the blanking size diagram.
And a second step: preprocessing
Clamping a slender shaft blank to be processed according to a preprocessing sequence diagram, clamping one end head of the slender shaft by using a three-jaw self-centering chuck in a machine tool spindle box, erecting a center frame, preprocessing the excircle and the end face of a whole shaft, turning M60X 2-6H threads (used for a well-type furnace heat treatment installation lifting appliance) on the excircle of the right end, and processing and transitioning by adopting an oblique angle according to the preprocessing sequence diagram at the shaft step position without the occurrence of right-angle direct transition.
And a third step of: solid solution treatment
According to the 310S (06Cr25Ni20 shaft material solutionizing treatment process, a shaft is subjected to solutionizing treatment in a shaft furnace, specifically, the shaft is subjected to heat treatment in a vertically suspended state during the heat treatment, at least one calibrated contact thermocouple is used and is arranged in the middle of the shaft to ensure the effectiveness of temperature reading, the charging temperature is less than or equal to 200 ℃, the temperature is increased to 1050 +/-10 ℃ at the speed of 120 ℃/h, the heat is preserved for 2h, the shaft is taken out of the furnace and cooled by water after the heat preservation process is finished, the time for transferring the shaft from a melting furnace to a water quenching tank is less than 60 seconds, and the water temperature of the water cooling tank cannot exceed 50 ℃ at any stage in the heat treatment process.
Step four: rough turning
According to the rough turning process, a three-jaw self-centering chuck and two center frames in a main shaft box are utilized to clamp a slender shaft. A center hole at one end is drilled by a center drill, a movable thimble is used for propping against the center hole to turn a shaft body, turning and clamping are carried out, a center frame with a cooling liquid pipe is arranged at the shaft body, cooling liquid enters the center frame through the cooling liquid pipe, the end part of the top shaft of a regulating screw rod is used for taking away heat generated by friction between the regulating screw rod of the center frame and the slender shaft and cutting heat generated by a cutter, so that stress generated by friction heat and cutting heat can be effectively avoided, and the bending deformation degree of the slender shaft in the processing process is reduced. And the follow-up rest is arranged on the opposite side surface of the processing position of the turning tool, so that the turning tool and the follow-up rest synchronously move on a guide rail of the turning tool and oppositely abut against the shaft body of the slender shaft. And then, carrying out rough turning operation, and reserving sufficient allowance for the excircle and the length of each section of the shaft according to a rough turning work order diagram. The excircle of the head parts at the two ends of the axle is convenient for finish turning and clamping the two ends of the axle as the datum of the finish axle.
And a fifth step: low temperature elimination of internal stress
According to the 310S (06Cr25Ni20 shaft material low-temperature internal stress eliminating heat treatment process, a shaft is subjected to low-temperature internal stress elimination in a shaft furnace, specifically, the shaft is in a vertical suspension state during heat treatment, at least one calibrated contact thermocouple is used during heat treatment and is arranged in the middle of the shaft to ensure the effectiveness of temperature reading, the charging temperature is less than or equal to 150 ℃, the temperature is increased to 250-300 ℃ at the speed of 150 ℃/h, the heat is preserved for 2h, and after the heat preservation process is finished, the shaft is taken out of the furnace and is vertically suspended for uniform air cooling.
A sixth procedure: UT nondestructive testing
And carrying out ultrasonic detection on the slender shaft, and checking whether the internal structure of the shaft is damaged or not.
A seventh step: finish turning
According to the fine turning process, a movable thimble and a machine tool spindle are used for clamping the slender shaft in a mode that three-jaw self-centering chucks clamp one another, and the outer circles at the head parts of two ends of the axle are used as the reference of the fine axle. The clamping method is characterized in that one end of a shaft is clamped by a three-jaw self-centering chuck of a machine tool spindle box in a clamping mode, the other end of the shaft is clamped by a rotatable triangular chuck modified by a movable thimble and screwed tightly to be locked, a center frame with a cooling liquid pipe is arranged at the shaft body, cooling liquid enters the center frame through the cooling liquid pipe, the end part of the top shaft of a regulating screw rod is used for taking away heat generated by friction between the regulating screw rod of the center frame and the slender shaft and cutting heat generated by a cutter, stress generated by friction heat and cutting heat can be effectively avoided, and the bending deformation degree of the slender shaft in processing is reduced. And arranging a follow rest on the opposite side of the turning tool, and then carrying out finish turning operation on the shaft. According to the fine turning process diagram, the length of the shaft is turned to meet the size requirement, and fine grinding allowance is reserved for each section of excircle. The rotational speed and feed rate of the process should be particularly careful to minimize the generation of additional stress. According to different diameters, the rotating speed and the feed amount are strictly executed according to process files.
And eighth step: milling
According to the milling process, the slender shaft is clamped and leveled on a milling machine, and key grooves in all positions on the milling shaft meet the size requirement. Care should be taken to prevent bending deformation of the shaft when milling the keyway.
The ninth procedure: fine grinding
According to the fine grinding process, the slender shaft is clamped and aligned on a horizontal grinding machine, all the outer diameters of the fine grinding shaft reach the final size, the jumping tolerance of the shaft meets the requirement, and the rotating speed and the feed amount are strictly controlled.
A tenth step: PT nondestructive testing
And (4) carrying out PT (potential Transformer) soaking flaw detection on the slender shaft, and checking whether the surface structure of the shaft is damaged or not. And (5) after the PT nondestructive testing procedure is qualified, the PT is accepted and stored in a warehouse, and the pump shaft of the high-temperature concentrated sulfuric acid submerged pump is machined.
The processing device and the processing method for the pump shaft of the high-temperature concentrated sulfuric acid submerged pump can effectively reduce the rejection rate of the long and thin shaft of the high-temperature concentrated sulfuric acid submerged pump in the machining process and improve the high-precision processing of the long and thin shaft.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a high temperature concentrated sulfuric acid submerged pump shaft processingequipment, its characterized in that, high temperature concentrated sulfuric acid submerged pump shaft processingequipment is including the three-jaw self-centering chuck (1) that is used for centre gripping slender axles blank one end, first center frame (2) and the second center frame (3) of supporting slender axles, processingequipment is still including follower rest (4), lathe tool (5) and the rotatable triangle chuck (6) of centre gripping slender axles that are located between first center frame and the second center frame.
2. The pump shaft processing device for the high-temperature concentrated sulfuric acid submerged pump according to claim 1, wherein the first center frame (2) and the second center frame (3) are both connected with cooling liquid pipes (201).
3. The pump shaft processing device for the high-temperature concentrated sulfuric acid submerged pump according to claim 1, wherein the rotatable triangular chuck (6) comprises a thimble, a circular base, a bearing, a disc and a triangular chuck.
4. A processing method of a pump shaft of a high-temperature concentrated sulfuric acid submerged pump is characterized by comprising the following steps:
the first process step: blanking, cutting a forging round bar material made of 310S (06Cr25Ni20) material as a blank material of the slender shaft 2 according to a blanking size diagram, and reserving a certain length allowance according to the blanking size diagram.
And a second step: preprocessing, namely clamping the slender shaft blank to be processed according to a preprocessing sequence diagram.
And a third step of: the solid solution treatment is carried out in a shaft furnace according to the 310S (06Cr25Ni20 shaft material solid solution treatment process.
Step four: rough turning, according to the rough turning process, a slender shaft is clamped by using a three-jaw self-centering chuck and two center frames in a main shaft box, cooling liquid enters the center frames through cooling liquid pipes, heat generated by friction between a center frame adjusting screw rod and the slender shaft is taken away, stress generated by friction heat and cutting heat can be effectively avoided, and the bending deformation degree of the slender shaft in the machining process is reduced.
And a fifth step: internal stress is eliminated at low temperature, and the internal stress is eliminated at low temperature in a shaft furnace according to a heat treatment process for eliminating the internal stress at low temperature of 310S (06Cr25Ni20 shaft material).
A sixth procedure: and UT nondestructive testing, ultrasonic testing is carried out on the slender shaft, and whether the internal structure of the shaft is damaged or not is checked.
A seventh step: finish turning, according to the process of the finish turning procedure, a movable thimble and a machine tool spindle are used for clamping the slender shaft in a mode that the three-jaw self-centering chuck clamps one top by one top, and the excircles at the head parts of two ends of the axle are used as the reference of the finish axle.
And eighth step: milling, namely clamping and leveling the slender shaft on a milling machine according to a milling process, and milling key grooves in all positions on the shaft to meet the size requirement. Care should be taken to prevent bending deformation of the shaft when milling the keyway.
The ninth procedure: and (3) fine grinding, namely clamping and aligning the slender shaft on a horizontal grinding machine according to a fine grinding process, wherein all outer diameters of the slender shaft are ground to the final size, the jumping tolerance of the shaft meets the requirement, and the rotating speed and the feed amount are strictly controlled.
A tenth step: PT nondestructive testing, carrying out PT soaking flaw detection on the slender shaft, and checking whether the surface structure of the shaft is damaged or not.
5. The method for processing the pump shaft of the high-temperature concentrated sulfuric acid submerged pump according to claim 4, wherein in the second procedure, according to a preprocessing sequence diagram, at the position of the step of the pump, right-angle direct transition needs to be avoided, and oblique angle processing transition is adopted.
6. The method for processing the pump shaft of the high-temperature concentrated sulfuric acid submerged pump according to claim 4, wherein the shaft is subjected to heat treatment in a vertically suspended state during the heat treatment in the third step, and at least one calibrated contact type thermocouple is arranged in the middle of the shaft to ensure the validity of temperature reading.
7. The method for processing the pump shaft of the high-temperature concentrated sulfuric acid submerged pump according to claim 4, wherein in the third procedure, the temperature of the furnace is less than or equal to 200 ℃, the temperature is increased to 1050 +/-10 ℃ at a speed of 120 ℃/h, the temperature is kept for 2h, after the heat preservation process is finished, the furnace is taken out and water-cooled, the time for transferring the shaft from the furnace to the water quenching tank is less than 60 seconds, and the water temperature of the water cooling tank cannot exceed 50 ℃ at any stage in the heat treatment process.
8. The method for processing the pump shaft of the high-temperature concentrated sulfuric acid submerged pump according to claim 4, wherein in the fifth step, the temperature of the furnace is less than or equal to 150 ℃, the temperature is increased to 250-300 ℃ at the speed of 150 ℃/h, the temperature is kept for 2h, and after the temperature keeping process is finished, the pump shaft is vertically suspended and uniformly air-cooled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010338960.4A CN112809397A (en) | 2020-04-26 | 2020-04-26 | Pump shaft machining device and method for high-temperature concentrated sulfuric acid submerged pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010338960.4A CN112809397A (en) | 2020-04-26 | 2020-04-26 | Pump shaft machining device and method for high-temperature concentrated sulfuric acid submerged pump |
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| CN112809397A true CN112809397A (en) | 2021-05-18 |
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| CN202010338960.4A Pending CN112809397A (en) | 2020-04-26 | 2020-04-26 | Pump shaft machining device and method for high-temperature concentrated sulfuric acid submerged pump |
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| CN105479104A (en) * | 2015-12-08 | 2016-04-13 | 合肥工业大学 | Machining method of slender shaft made of17-4PH stainless steel material |
| CN109746637A (en) * | 2017-11-06 | 2019-05-14 | 慈溪市帅吉文体用品有限公司 | The processing technology of PH stainless steel pump shaft |
| CN210255138U (en) * | 2019-08-19 | 2020-04-07 | 长春迪达隆轨道车辆装备有限公司 | Co-location lathe center frame |
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2020
- 2020-04-26 CN CN202010338960.4A patent/CN112809397A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1516940A1 (en) * | 2003-09-18 | 2005-03-23 | Mahindra & Mahindra Ltd. | Method for producing gears and/or shaft components with superior bending fatigue strength and pitting fatigue life from conventional alloy steel |
| CN101476078A (en) * | 2009-02-13 | 2009-07-08 | 上海新闵重型锻造有限公司 | Method for manufacturing super two-phase stainless steel large-sized sea water pump shaft |
| CN102310337A (en) * | 2011-08-22 | 2012-01-11 | 昆明水泵厂 | Processing method of middle joint pipe |
| CN102490029A (en) * | 2011-12-21 | 2012-06-13 | 江西江铃底盘股份有限公司 | Rolling type center frame |
| CN104759831A (en) * | 2014-01-04 | 2015-07-08 | 临安创投机械有限公司 | Machining technology for blades in liquid pump for pumping viscous fluid |
| CN104493437A (en) * | 2014-11-25 | 2015-04-08 | 浙江铂达科技有限公司 | Oil pump shaft machining process |
| CN104625608A (en) * | 2014-12-09 | 2015-05-20 | 叶勤 | Long and thin flat shaft machining method |
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Application publication date: 20210518 |
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