CN113414553A - Machining process of main pump impeller cover of shaft seal of nuclear power station - Google Patents
Machining process of main pump impeller cover of shaft seal of nuclear power station Download PDFInfo
- Publication number
- CN113414553A CN113414553A CN202110731406.7A CN202110731406A CN113414553A CN 113414553 A CN113414553 A CN 113414553A CN 202110731406 A CN202110731406 A CN 202110731406A CN 113414553 A CN113414553 A CN 113414553A
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- China
- Prior art keywords
- impeller cover
- cutter
- workbench
- support
- impeller
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a machining process of an impeller cover of a main pump of a shaft seal of a nuclear power station, which comprises the steps of placing an impeller cover blank (1) on a lathe workbench (2) for alignment, fixing the impeller cover blank (1) by using a workbench clamping jaw (3), and turning the upper positions (4) of the inner circle and the outer circle of the impeller cover blank (1); the tire (5) is placed on a lathe workbench (2) for alignment, the tire (5) is fixed by a workbench clamping jaw (3), the impeller cover (7) is arranged in a spigot (6) of the tire (5) in the overturning direction, and a pull rod (9) with threads at two ends is arranged in a threaded hole (27) of the lathe workbench (2). The thin wall position of the impeller cover turned by the process method of the invention can not generate deformation, the locking plate groove is very stable when being processed, the locking plate groove obtains very high position degree and surface roughness, the problem that the precision requirement can not be met when the locking plate groove is processed by a manual tool is solved, and the production capacity and the economic benefit of enterprises are greatly improved so as to improve the processing efficiency.
Description
The technical field is as follows:
the invention relates to a machining process of a shaft seal main pump impeller cover of a nuclear power station.
Background art:
the outer guide pipe of the nuclear power station shaft seal main pump is one of key parts of the nuclear power station shaft seal main pump, and the processing and manufacturing of the impeller cover are particularly important for the localization of the shaft seal nuclear main pump. The technical problems of ensuring the machining of the thin-wall impeller cover not to deform, ensuring the coaxiality of the inner circle and the outer circle and machining the locking plate groove are the technical problems of the workpiece. The original turning process method is to directly clamp and machine the impeller cover, and has the defects that the direct clamping easily causes the deformation of the impeller cover, and the coaxiality of the inner circle and the outer circle cannot be ensured, after the assembly, if the coaxiality difference of the inner circle and the outer circle can cause the impeller to scratch the impeller cover when a main pump runs, so that accidents are caused.
The invention content is as follows:
the invention aims to disclose a processing technology of a nuclear power station main pump impeller cover, which has high reliability, high processing quality and high processing efficiency and can ensure the coaxiality of inner and outer circles of the nuclear power station main pump impeller cover and the design requirements of an impeller cover locking plate groove. The technical scheme of the invention is as follows: a machining process of a shaft seal main pump impeller cover of a nuclear power station comprises the following steps:
1) after the impeller casing blank (1) is placed on a lathe workbench (2) for alignment, the impeller casing blank (1) is fixed by a workbench clamping jaw (3), and the upper positions (4) of the inner circle and the outer circle of the impeller casing blank (1) are turned;
2) the method comprises the steps of placing a tire (5) on a lathe workbench (2) for alignment, fixing the tire (5) by using a workbench clamping jaw (3), installing an impeller cover (7) into a spigot (6) of the tire (5) in the overturning direction, installing a pull rod (9) with threads at two ends into a threaded hole (27) of the lathe workbench (2), enabling a first pressing plate (10) to penetrate through the pull rod (9), vertically placing a first support (8) between the workbench (2) and the first pressing plate (10) and attaching the first support, placing a first support block (12) between the impeller cover (7) and the first pressing plate (10) and attaching the first support block, fastening a nut (11) onto the pull rod (9) and fixing the first pressing plate (10) to finish turning of a piston ring groove (13) and an excircle middle position (14) of the impeller cover (7);
3) mounting a second support (15) on the outer side of the impeller cover (7), fixing the second support (15) by using a bolt (29), placing a second supporting block (19) on the second support (15), placing a backing plate (16) on a piston ring groove (13), pressing a second pressing plate (18) on the backing plate (16) and the second supporting block (19), fastening the second pressing plate (18) and the second support (15) by using a bolt (17), removing a fastening nut (11), a fixed pressing plate (4), a pull rod (9), a first support (8) and a first supporting block (12), and completing the turning of an inner circle (21) and an end face (20) of the impeller cover (7);
4) aligning the impeller cover (7) and fixing the impeller cover on a workbench of a machining center (22);
5) machining a bolt hole (28) in the impeller cover (7);
6) mounting an angle head (26) on a machining center (23), and mounting a three-edge cutter (25) on the angle head (26);
7) determining the cutting linear speed and the feed amount per tooth of the cutter according to the material characteristics of the impeller cover, determining the cutting linear speed and the feed amount per tooth of the cutter according to the formula S-V/D/pi, wherein S represents the rotation speed of the cutter, V represents the linear speed of the cutter, and D represents the diameter of the cutter), F-S-Z-F, F represents the feed speed of the cutter, S represents the rotation speed of the cutter, Z represents the number of edges of the cutter, and F represents the feed amount per tooth of the cutter, calculating the rotation speed and the feed speed of the cutter, and machining the lock piece groove by using a verified and error-free numerical control program to finish all machining.
The invention has the technical effects that:
the invention creatively adopts a processing tool integrating an inner circle and an outer circle to turn the impeller cover, in the step 2 and the step 3, the same mould is adopted, the inner circle and the outer circle are respectively processed under the condition of not removing and moving a workpiece, the process method has the advantages that firstly, the thin-wall position of the tip part of the impeller cover is processed, the seam allowance of the tire is arranged in the thin-wall position for positioning, the position of the impeller cover can be adjusted by adjusting the position of the tire, the alignment of the impeller cover on a lathe worktable is completed, secondly, the tire used in the step 2 and the step 3 can prevent the deformation caused by directly clamping the outer circle of the impeller cover, the seam allowance of the tire adopted by the process method can support the thin-wall position of the impeller cover, so that the radial clamping force is acted on the tire, the deformation caused by directly clamping the thin-wall position of the impeller cover can not be generated, the process method places the thin-wall end at the lower side, and the groove end of a piston ring is at the upper side, interference between a machine tool and a workbench when a piston ring groove is machined can be avoided, the clamping problem when the piston ring groove of the impeller cover is machined is effectively solved, thirdly, after the outer circle of the impeller cover in the step 2 is machined, when the outer circle of the impeller cover is machined in the step 3, the outer circle machining fixing tool is fixed, the fixing tool used for machining the inner circle is installed firstly, and then the fixing tool used for machining the outer circle is removed. The angle head and the three-edge cutter are combined to replace a processing mode of a hand tool, so that the processing efficiency is improved, the requirements on the consistency, the precision and the roughness of the processing effect are met, the quality of a product is improved, the inconsistency caused by manual operation is avoided, and the problem that the precision and the roughness of the locking plate groove cannot meet the design requirements is solved.
Description of the drawings:
FIG. 1 impeller cup blank machining drawing
FIG. 2 schematic view of clamping for machining outer circle of impeller cover
FIG. 3 schematic view of clamping for machining inner circle of impeller cover
FIG. 4 is a schematic view of hole machining clamping
The specific implementation mode is as follows:
a machining process of a main pump impeller casing of a shaft seal of a nuclear power station adopts a vertical machine tool to match a non-standard tool to carry out a machining process, adopts a five-axis machining center to match an angle head, and combines a three-edge cutter to carry out numerical control programming machining, and the method comprises the following steps:
1) after the impeller casing blank 1 is placed on a lathe workbench 2 for alignment, the impeller casing blank 1 is fixed by using a workbench claw 3, and the upper positions 4 of the inner circle and the outer circle of the impeller casing blank 1 are turned, as shown in figure 1;
2) the method comprises the following steps of (1) placing a tire 5 on a lathe workbench 2 for alignment, fixing the tire 5 by using a workbench clamping jaw 3, installing an impeller cover 7 into a spigot 6 of the tire 5 in the overturning direction, installing a pull rod 9 with threads at two ends into a threaded hole 27 of the lathe workbench 2, enabling a first pressure plate 10 to penetrate through the pull rod 9, vertically placing a first support 8 between the workbench 2 and the first pressure plate 10 for attachment, placing a first support block 12 between the impeller cover 7 and the first pressure plate 10 for attachment, fastening a nut 11 onto the pull rod 9 for fixing the first pressure plate 10, and completing turning of a piston ring groove 13 and an excircle middle position 14 of the impeller cover 7, as shown in fig. 2;
3) mounting a second support 15 on the outer side of the impeller cover 7, fixing the second support 15 by using a bolt 29, placing a second support block 19 on the second support 15, placing a backing plate 16 on a piston ring groove 13, pressing a second pressure plate 18 on the backing plate 16 and the second support block 19, fastening the second pressure plate 18 and the second support 15 by using a bolt 17, removing a fastening nut 11, a fixed pressure plate 4, a pull rod 9, a first support 8 and a first support block 12, and completing turning of an inner circle 21 and an end face 20 of the impeller cover 7, as shown in fig. 3;
4) the impeller cover 7 is fixed on a worktable of a machining center 22 after being aligned;
5) machining bolt holes 28 on the impeller cover 7;
6) the angle head 26 is mounted on the machining center 23, and the three-edge cutter 25 is mounted on the angle head 26, as shown in fig. 4;
7) determining the cutting linear speed and the feed amount per tooth of the cutter according to the material characteristics of the impeller cover, determining the cutting linear speed and the feed amount per tooth of the cutter according to the formula S-V/D/pi, wherein S represents the rotation speed of the cutter, V represents the linear speed of the cutter, and D represents the diameter of the cutter), F-S-Z-F, F represents the feed speed of the cutter, S represents the rotation speed of the cutter, Z represents the number of edges of the cutter, and F represents the feed amount per tooth of the cutter, calculating the rotation speed and the feed speed of the cutter, and machining the lock piece groove by using a verified and error-free numerical control program to finish all machining.
Claims (1)
1. A machining process of an impeller cover of a main pump of a shaft seal of a nuclear power station is characterized by comprising the following steps: the method comprises the following steps:
1) after the impeller casing blank (1) is placed on a lathe workbench (2) for alignment, the impeller casing blank (1) is fixed by a workbench clamping jaw (3), and the upper positions (4) of the inner circle and the outer circle of the impeller casing blank (1) are turned;
2) the method comprises the steps of placing a tire (5) on a lathe workbench (2) for alignment, fixing the tire (5) by using a workbench clamping jaw (3), installing an impeller cover (7) into a spigot (6) of the tire (5) in the overturning direction, installing a pull rod (9) with threads at two ends into a threaded hole (27) of the lathe workbench (2), enabling a first pressing plate (10) to penetrate through the pull rod (9), vertically placing a first support (8) between the workbench (2) and the first pressing plate (10) and attaching the first support, placing a first support block (12) between the impeller cover (7) and the first pressing plate (10) and attaching the first support block, fastening a nut (11) onto the pull rod (9) and fixing the first pressing plate (10) to finish turning of a piston ring groove (13) and an excircle middle position (14) of the impeller cover (7);
3) mounting a second support (15) on the outer side of the impeller cover (7), fixing the second support (15) by using a bolt (29), placing a second supporting block (19) on the second support (15), placing a backing plate (16) on a piston ring groove (13), pressing a second pressing plate (18) on the backing plate (16) and the second supporting block (19), fastening the second pressing plate (18) and the second support (15) by using a bolt (17), removing a fastening nut (11), a fixed pressing plate (4), a pull rod (9), a first support (8) and a first supporting block (12), and completing the turning of an inner circle (21) and an end face (20) of the impeller cover (7);
4) aligning the impeller cover (7) and fixing the impeller cover on a workbench of a machining center (22);
5) machining a bolt hole (28) in the impeller cover (7);
6) mounting an angle head (26) on a machining center (23), and mounting a three-edge cutter (25) on the angle head (26);
7) determining the cutting linear speed and the feed amount per tooth of the cutter according to the material characteristics of the impeller cover, determining the cutting linear speed and the feed amount per tooth of the cutter according to the formula S-V/D/pi, wherein S represents the rotation speed of the cutter, V represents the linear speed of the cutter, and D represents the diameter of the cutter), F-S-Z-F, F represents the feed speed of the cutter, S represents the rotation speed of the cutter, Z represents the number of edges of the cutter, and F represents the feed amount per tooth of the cutter, calculating the rotation speed and the feed speed of the cutter, and machining the lock piece groove by using a verified and error-free numerical control program to finish all machining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110731406.7A CN113414553B (en) | 2021-06-30 | 2021-06-30 | Machining process of main pump impeller cover of shaft seal of nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110731406.7A CN113414553B (en) | 2021-06-30 | 2021-06-30 | Machining process of main pump impeller cover of shaft seal of nuclear power station |
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| CN113414553A true CN113414553A (en) | 2021-09-21 |
| CN113414553B CN113414553B (en) | 2022-05-13 |
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| CN202110731406.7A Active CN113414553B (en) | 2021-06-30 | 2021-06-30 | Machining process of main pump impeller cover of shaft seal of nuclear power station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115026606A (en) * | 2022-08-11 | 2022-09-09 | 成都航天万欣科技有限公司 | Method for machining large thin-wall conical shell |
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2021
- 2021-06-30 CN CN202110731406.7A patent/CN113414553B/en active Active
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| CN113414553B (en) | 2022-05-13 |
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