CN111250938A - QPQ (quench-Polish-quench) machining process for rotor of backing pump - Google Patents
QPQ (quench-Polish-quench) machining process for rotor of backing pump Download PDFInfo
- Publication number
- CN111250938A CN111250938A CN202010194602.0A CN202010194602A CN111250938A CN 111250938 A CN111250938 A CN 111250938A CN 202010194602 A CN202010194602 A CN 202010194602A CN 111250938 A CN111250938 A CN 111250938A
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- Prior art keywords
- backing pump
- pump rotor
- section
- rotor
- qpq
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
Abstract
The invention discloses a QPQ (quench-Polish-quench) machining process for a backing pump rotor, and relates to the technical field of finish machining of industrial pump rotors. In the invention: carrying out medium-low temperature tempering treatment on the backing pump rotor after the processing treatment, controlling the tempering temperature to be 600 +/-10 ℃, and keeping the tempering temperature for 4 hours; and E-section outer ring surface polishing treatment is carried out on the backing pump rotor which finishes the fine grinding, the oil rotary vane groove and the oilstone polishing, and QPQ process treatment is carried out on the backing pump rotor after polishing. According to the invention, the backing pump rotor of the rough cutting rotary vane groove is subjected to medium-low temperature tempering treatment at about 600 ℃, and the backing pump rotor subjected to medium-low temperature tempering is subjected to subsequent processing operations such as drilling, key groove milling, fine cutting rotary vane groove cutting and the like, so that the stability of the structural size of the backing pump rotor subjected to subsequent fine processing is ensured, deformation caused by QPQ (quench-Polish-quench) treatment is avoided, the processing completion precision of the backing pump rotor is improved, and the application effect and the service life of the backing pump are ensured.
Description
Technical Field
The invention relates to the technical field of finish machining of industrial pump rotors, in particular to a QPQ (quench-Polish-quench) machining process for a backing pump rotor.
Background
In the process of producing and processing the industrial pump, the processing and manufacturing of internal elements of the industrial backing pump are also important factors determining the performance of the industrial pump device, and particularly, the backing pump rotor deeply processes and finely processes the backing pump rotor, so that the service performance of the rotor is influenced. In the direct QPQ process, the prior art is directly subjected to the QPQ process after rough turning, finish turning, cutting of the rotor groove, and the like are performed on the backing pump rotor before the QPQ process of the backing pump rotor of the industrial pump, and the backing pump rotor is not subjected to the preheating process in the front and rear stages of the cutting of the rotor groove, so that the backing pump rotor directly enters the QPQ process and the body is easily slightly deformed, which causes a reduction in the precision and dimension of the backing pump rotor after the QPQ process, and affects the subsequent use effect and life.
Disclosure of Invention
The invention aims to provide a QPQ processing technology for a backing pump rotor, which ensures the stability of the structural dimension of the backing pump rotor after subsequent finish machining, does not deform due to QPQ processing, improves the machining finishing precision of the backing pump rotor, and ensures the application effect and the service life of the backing pump.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention provides a QPQ (quench-Polish-quench) machining process of a backing pump rotor, which comprises the steps of carrying out rough turning treatment on the backing pump rotor, finishing molybdenum wire hole drilling, carrying out quenching and tempering, finish turning treatment, tapping and grinding a central hole, carrying out rough grinding on an excircle and roughly cutting a rotor plate groove; after rough turning, the front pump rotor is processed into A, B, C, D, E sectional structures.
And (3) carrying out medium-low temperature tempering treatment on the backing pump rotor after the processing treatment, controlling the tempering temperature to be 600 +/-10 ℃, and keeping the tempering temperature for 4 hours.
Drilling and finish milling the side face of the section A end of the backing pump rotor which completes the medium and low temperature tempering; processing C, D sections of ring side key grooves on the pre-stage pump rotor after drilling and finish milling the side face of the section A; after the keyseat of the section C, D of the backing pump rotor is completed, the outer circumference of the ring side of each section A, B, C, D, E of the backing pump rotor is primarily ground.
After the primary outer circle fine grinding operation is completed, performing rotary vane groove fine cutting operation on the E section of the backing pump rotor, wherein when the rotary vane groove is deeply cut, one end of a long positioning plate with high hardness protrudes out of the E section cylinder body, and when the rotary vane groove is cut to the lowest position, the part of the long positioning plate protruding out of the E section cylinder body is clamped on the A section cylinder body, so that the cutting depth/precision of the rotary vane groove is ensured; performing oilstone polishing and oil rotary vane groove operation on the backing pump rotor which finishes the finish cutting rotary vane groove; and (4) grinding the oilstone and finely grinding the front end side face and the rear end side face of the E section of the backing pump rotor behind the oil rotary vane groove.
And after finishing the accurate grinding operation of the front end side and the rear end side of the E section of the rotor of the backing pump, performing accurate grinding processing on the outer ring side of the E section, then performing oil spinning groove processing on the spinning groove on the E section again, and performing oilstone polishing processing.
And E-section outer ring surface polishing treatment is carried out on the backing pump rotor which finishes the fine grinding, the oil rotary vane groove and the oilstone polishing, and QPQ process treatment is carried out on the backing pump rotor after polishing.
As a preferred technical scheme of the invention, when the backing pump rotor is subjected to medium-low temperature tempering, a high-temperature resistant ceramic tray is arranged on the lower side of a backing pump rotor workpiece; an inward concave clamping groove for clamping the backing pump rotor is formed in the ceramic tray; a plurality of inner groove bulges used for supporting the backing pump rotor are arranged in the inner concave clamping grooves of the ceramic tray.
As a preferred technical scheme of the invention, two drill holes on the side surface of the section A end are symmetrical about a central hole on the side surface of the section A end; two drill holes on the side surface of the section A end extend into the section E cylinder structure of the backing pump rotor.
As a preferable technical solution of the present invention, when the key groove milling is performed on the C, D-stage ring side of the backing pump rotor, one end of the key groove on the C-stage is open, and the length dimension of the key groove on the D-stage is the same as the length dimension of the D-stage column.
As a preferable technical scheme of the invention, the parallelism of the spiral piece groove structure on the E section of the backing pump rotor is 0.01, and the symmetry is 0.015.
As a preferable technical scheme of the invention, when the front end side and the rear end side of the section E of the backing pump rotor are finely ground, the chamfer structure size at the joint position of the inner side direction of the front end side and the rear end side of the section E and the section A, B is ensured to be in a reasonable size range.
As a preferred technical scheme of the invention, the nitriding temperature is controlled to be 570 +/-10 ℃ in the QPQ treatment process of the backing pump rotor.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the backing pump rotor of the rough cutting rotary vane groove is subjected to medium-low temperature tempering treatment at about 600 ℃, and the backing pump rotor subjected to medium-low temperature tempering is subjected to subsequent processing operations such as drilling, key groove milling, fine cutting rotary vane groove cutting and the like, so that the stability of the structural size of the backing pump rotor subjected to subsequent fine processing is ensured, deformation caused by QPQ (quench-Polish-quench) treatment is avoided, the processing completion precision of the backing pump rotor is improved, and the application effect and the service life of the backing pump are ensured.
Drawings
FIG. 1 is a schematic view of a matching structure of a ceramic tray and a backing pump rotor according to the present invention;
FIG. 2 is a schematic structural view of a drilling of a section A of a backing pump rotor according to the present invention;
FIG. 3 is a schematic diagram of a configuration for keyseat a section of the backing pump rotor C, D according to the present invention;
FIG. 4 is a schematic diagram of the primary cylindrical finish of the ring side of segments A, B, C, D, E of the backing pump rotor according to the present invention;
FIG. 5 is a schematic structural view of a finish-cut rotor slot according to the present invention;
FIG. 6 is a schematic end view of a finish-cut rotor slot of the present invention;
FIG. 7 is a schematic flow diagram of a QPQ process for the backing pump rotor of the present invention;
wherein: 1-a backing pump rotor; 2-a ceramic tray; 3-an inward concave clamping groove; 4-inner groove convex.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention relates to a QPQ processing technology of a backing pump rotor, which comprises the following steps:
and performing QPQ processing on the backing pump rotor workpiece which is subjected to blanking and rough turning processing to finish molybdenum wire hole drilling, quenching and tempering, finish turning processing, tapping and grinding of a central hole, rough grinding of an outer circle and rough cutting of a rotor groove.
After roughly cutting a rotary vane groove on a backing pump rotor, carrying out medium-low temperature tempering processing on the backing pump in the state, in the processing process, supporting the backing pump rotor by adopting a high-temperature-resistant ceramic bottom tray provided with an inwards concave structure, matching the inwards concave structure on the high-temperature-resistant ceramic with the excircle size of the backing pump rotor, and arranging a plurality of convex structures for supporting/suspending the backing pump rotor at the inner side of the inwards concave structure on the high-temperature-resistant ceramic to ensure that the backing pump rotor can be uniformly heated; the temperature for low-temperature tempering is controlled to be 600 +/-10 ℃ in the state, and the tempering and heat preservation are carried out on the backing pump rotor for 4 hours in the temperature state.
Before QPQ treatment is carried out on the backing pump rotor, medium-low temperature tempering is carried out on the backing pump rotor with the rough grinding excircle and the rough cutting rotary vane slot, so that deformation of the backing pump rotor in the post-processing and using processes can be prevented.
After the pre-pump rotor is subjected to the medium-low temperature tempering treatment, the front side end face of the section A side of the pre-pump rotor is subjected to drilling and finish milling hole treatment, two drilled holes are located on two sides of the same diameter line of the center hole of the section A side, and meanwhile, the sharp corner position is paid attention to not to be collided.
And after drilling and finish milling are carried out on the section A of the backing pump rotor, key grooves are milled on the ring side of the section C, D of the backing pump rotor, and the horizontal parallelism of the upper groove wall surface and the lower groove wall surface of the key groove on the section C, D of the backing pump rotor is ensured to be the same.
And after key groove milling of C, D sections of the backing pump rotor is completed, primary excircle finish grinding is carried out on the ring side surface of A, B, C, D, E sections of the backing pump rotor, attention is paid to prevention of collision of sharp corners in the excircle finish grinding process, and specific finish grinding parameters of each section of the backing pump rotor in the process are shown in detail in figure 4.
And after the primary outer circle fine grinding operation on the backing pump rotor is finished, performing rotary vane groove fine cutting operation on the section E of the backing pump rotor, wherein the parallelism and the symmetry of the rotary vane groove structure on the section E of the backing pump rotor processed in the step are respectively 0.01 and 0.015.
And after the oil stone is polished and the oil spinning disc grooves are formed, the front end side and the rear end side of the section E of the backing pump rotor are finely ground, and the accurate grinding process is careful to ensure that the chamfer structure size at the joint position of the inner side position of the front end side and the rear end side of the section E and the section A, B is in a reasonable size range.
After the finish grinding processing of the front end side and the rear end side of the section E of the backing pump rotor is completed, the outer ring side of the section E is subjected to finish grinding processing, then the oil vane groove processing is performed on the vane grooves in the section E again, and then the oilstone polishing processing is performed, so that the situation that no burr and no chamfer trace appear at the edge of the front end face and the rear end face of the section E and the front edge and the rear edge of the outer ring side of the section E is ensured.
Polishing the outer ring surface of the section E of the backing pump rotor after the treatment to ensure that the surface of the outer ring side surface of the section E is smooth, and then performing QPQ (quench-Polish-quench) process treatment on the backing pump rotor, wherein in the QPQ treatment process, the nitriding temperature is controlled to be about 570 ℃ because the backing pump rotor belongs to a high-speed rotating device; meanwhile, after the treatment of nitridation, oxidation and the like, the surface hardness of the backing pump rotor is kept at HV400-500, and the unilateral increase size of the backing pump rotor is not more than 0.005 mm. If the salt spray test is carried out on the backing pump rotor, the rust spots can be erased after 72 hours of the salt spray test.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A QPQ processing technology of a backing pump rotor comprises the steps of roughly turning the backing pump rotor to finish molybdenum wire hole drilling, tempering, finely turning, tapping, grinding a center hole, roughly grinding an outer circle and roughly cutting a rotor groove; the backing pump rotor processes A, B, C, D, E segmentation structure, its characterized in that through the rough turning after handling:
carrying out medium-low temperature tempering treatment on the backing pump rotor after the processing treatment, controlling the tempering temperature to be 600 +/-10 ℃, and keeping the tempering temperature for 4 hours;
drilling and finish milling the side face of the section A end of the backing pump rotor which completes the medium and low temperature tempering;
processing C, D sections of ring side key grooves on the pre-stage pump rotor after drilling and finish milling the side face of the section A;
after key groove milling of the C, D sections of the backing pump rotor is completed, primary outer circle fine grinding is carried out on the ring side face of each A, B, C, D, E section of the backing pump rotor;
after the primary outer circle fine grinding operation is completed, performing rotary vane groove fine cutting operation on the E section of the backing pump rotor, wherein when the rotary vane groove is deeply cut, one end of a long positioning plate with high hardness protrudes out of the E section cylinder body, and when the rotary vane groove is cut to the lowest position, the part of the long positioning plate protruding out of the E section cylinder body is clamped on the A section cylinder body, so that the cutting depth/precision of the rotary vane groove is ensured;
performing oilstone polishing and oil rotary vane groove operation on the backing pump rotor which finishes the finish cutting rotary vane groove;
grinding the oilstone and finely grinding the front end side face and the rear end side face of the E section of the backing pump rotor behind the oil rotary vane groove;
after finishing the accurate grinding operation of the front end side and the rear end side of the E section of the rotor of the backing pump, carrying out accurate grinding processing on the outer ring side of the E section, then carrying out oil spinning plate groove processing on the spinning plate groove on the E section again, and carrying out oilstone polishing processing;
and E-section outer ring surface polishing treatment is carried out on the backing pump rotor which finishes the fine grinding, the oil rotary vane groove and the oilstone polishing, and QPQ process treatment is carried out on the backing pump rotor after polishing.
2. The QPQ process for the backing pump rotor of claim 1, wherein:
when the backing pump rotor is subjected to medium-low temperature tempering, a high-temperature-resistant ceramic tray is arranged on the lower side of a backing pump rotor workpiece;
an inward concave clamping groove for clamping the backing pump rotor is formed in the ceramic tray;
a plurality of inner groove bulges used for supporting the backing pump rotor are arranged in the inner concave clamping grooves of the ceramic tray.
3. The QPQ process for the backing pump rotor of claim 1, wherein:
the two drill holes on the side surface of the section A end are symmetrical about the central hole on the side surface of the section A end;
two drill holes on the side surface of the section A end extend into the section E cylinder structure of the backing pump rotor.
4. The QPQ process for the backing pump rotor of claim 1, wherein:
when the C, D section ring side to the backing pump rotor carries out the keyseat, the keyway one end on the C section is the open type, and the keyway length dimension on the D section is the same with the length dimension of D section cylinder.
5. The QPQ process for the backing pump rotor of claim 1, wherein:
the parallelism of the spiral sheet groove structure on the E section of the backing pump rotor is 0.01, and the symmetry is 0.015.
6. The QPQ process for the backing pump rotor of claim 1, wherein:
when the front end side face and the rear end side face of the section E of the backing pump rotor are finely ground, the size of a chamfer structure at the joint position of the inner side direction of the front end side face and the rear end side face of the section E and the section A, B is ensured to be in a reasonable size range.
7. The QPQ process for the backing pump rotor of claim 1, wherein:
and in the QPQ treatment process of the rotor of the backing pump, the nitriding temperature is controlled to be 570 +/-10 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010194602.0A CN111250938B (en) | 2020-03-19 | 2020-03-19 | QPQ (quench-Polish-quench) machining process for rotor of backing pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010194602.0A CN111250938B (en) | 2020-03-19 | 2020-03-19 | QPQ (quench-Polish-quench) machining process for rotor of backing pump |
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| Publication Number | Publication Date |
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| CN111250938A true CN111250938A (en) | 2020-06-09 |
| CN111250938B CN111250938B (en) | 2021-03-23 |
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| EP2180147A1 (en) * | 2008-06-18 | 2010-04-28 | Mitsubishi Heavy Industries, Ltd. | Rotor of rotary machine and method for manufacturing same |
| EP2646654A2 (en) * | 2010-12-01 | 2013-10-09 | ITT Manufacturing Enterprises, Inc. | Sliding vane pump |
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