CN111331318A - Method for processing integrally cast seat ring - Google Patents
Method for processing integrally cast seat ring Download PDFInfo
- Publication number
- CN111331318A CN111331318A CN202010127662.0A CN202010127662A CN111331318A CN 111331318 A CN111331318 A CN 111331318A CN 202010127662 A CN202010127662 A CN 202010127662A CN 111331318 A CN111331318 A CN 111331318A
- Authority
- CN
- China
- Prior art keywords
- machining
- seat ring
- fixed guide
- guide vane
- ring plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The invention belongs to the technical field of machining, and particularly relates to a machining method of an integrally cast seat ring, which solves the machining problem in the prior art, adopts blades of fixed guide vanes between an upper ring plate and a lower ring plate of the integrally cast seat ring to machine from outer edges to inner edges, and simulates the interference of a cutter in advance in the machining process, so that the machining precision of water inlet edges and water outlet edge profiles of the fixed guide vanes of the seat ring can be ensured, the requirement of dimensional tolerance of the intervals of a plurality of fixed guide vanes is met, the cutter machining track is less in empty cutter, the cutter track is reliable, the polishing cost is reduced, and the machining efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a machining method of a block casting seat ring.
Background
The seat ring is used as a key part of the water turbine, is generally formed by welding an upper ring plate, a lower ring plate and a plurality of fixed guide vanes between the fixed upper ring plate and the lower ring plate, is mainly used for bearing the axial water thrust, the rotating part and the fixed part weight of the water turbine, introduces water flow into a water guide mechanism with minimum hydraulic loss, and takes the seat ring as a reference when a unit is installed. Along with the improvement of the requirement of a power station on the installation progress of the water turbine, in order to eliminate the deformation of the seat ring caused by welding, the water turbine seat ring adopts an integral casting method, and then the precision is improved and the manufacturing period is shortened by adopting numerical control machine processing. The integral casting method of the seat ring is that an upper ring plate, a lower ring plate and a fixed guide vane are printed with sand molds in a 3D mode, and then integral casting is carried out to form the integrally cast seat ring; after pouring is finished, the integral seat ring casting can shrink and deform, and the distance size between adjacent fixed guide vanes is not uniformly distributed around the circumference, so that the requirement of the accuracy of the geometric tolerance between the fixed guide vanes cannot be met, and the efficiency and the stability of the water turbine are influenced; if the dimensional tolerance of the whole casting seat ring fixed guide vanes is guaranteed, a numerical control machining machine tool is needed for machining, so that the sizes of the fixed guide vanes are uniformly distributed along the circumference; the main difficult problems of the processing of the integral casting seat ring are as follows: every stay vane is processed alone when fixed guide vane of processing advances the water limit, because upper ring plate and lower ring plate shelter from the unable processing of interference when processing stay vane's the play water limit, the in-process of polishing adopts the model to polish and handles, seriously influences machining efficiency and quality.
Disclosure of Invention
The invention provides a machining method of an integrally cast seat ring, which solves the machining problem in the prior art, adopts the method that blades of fixed guide vanes between an upper ring plate and a lower ring plate of the integrally cast seat ring are machined from outer edges to inner edges, and simulates the interference of a cutter in advance in the machining process, so that the machining precision of water inlet edges and water outlet edge profiles of the fixed guide vanes of the seat ring can be ensured, the requirement of dimensional tolerance of the intervals of a plurality of fixed guide vanes is met, the cutter machining track is less free, the cutter track is reliable, the grinding cost is reduced, and the machining efficiency is improved.
A machining method for a block casting seat ring comprises an upper ring plate, a lower ring plate and fixed guide vanes, and comprises the following steps:
step S01, collecting cloud point data of the whole casting seat ring;
step S02, roughly machining end faces and inner contour lines of an upper ring plate and a lower ring plate by a vertical lathe;
step S03, roughly machining the blade water outlet edge of the fixed guide vane by a gantry milling machine;
step S04, roughly machining the water inlet edge of the fixed guide vane by a boring and milling machine;
step S05, finish machining the blade water outlet edge of the fixed guide vane by a gantry mill;
step S06, finely machining the water inlet edge of the fixed guide vane by a boring and milling machine;
and step S07, finishing the end faces and the inner contour lines of the upper ring plate and the lower ring plate by a turning and milling machining center.
Further, step S01 is specifically that, since the stay vanes are formed by a plurality of blades uniformly distributed along the circumference, the initial angle between the blades cannot be determined during machining; the method comprises the steps of placing mark points on the surfaces of an upper ring plate, a lower ring plate and a fixed guide vane of a whole casting seat ring blank, taking pictures of the whole casting seat ring in all directions by adopting a professional camera, guiding the pictures into a computer for image processing, establishing a three-dimensional model, fitting to generate the whole casting seat ring blank, and determining the initial angle for machining the fixed guide vane.
Further, the processing method in step S03 adopts a depth profile processing method to generate a processing tool path, and performs a machine tool simulation dynamic simulation.
Further, the processing method in step S03 further includes taking the end face of the lower ring plate as a mounting and positioning face, aligning the casting seat ring according to the reference point coordinates of the water outlet edge, and then processing the profile of the water outlet edge of the blade of the stay vane; the machining mode of processing the blade water outlet edge of the fixed guide vane adopts depth profile milling, an universal accessory is installed at the position of a main shaft of the machine tool, the angle of a cutter shaft is rotated according to the horizontal included angle between the array angle of the fixed guide vane and the cutter shaft, the overlapped shielding part between the adjacent fixed guide vanes is machined, the cutting direction is from the outer edge to the inner edge of the blade of the fixed guide vane, and the angle of the safety accessory of the machine tool is adjusted by machining one fixed guide vane.
Further, in the step S04, the boring and milling machine is a numerical control boring and milling machine with a rotary table.
Further, step S04 is specifically to place the block-casting seat ring on a rotary table, with the rotation center as a zero point, and process the surface of the stay vane by adjusting an included angle between the surface of the stay vane and the tool spindle; establishing a workpiece coordinate system by taking a rib line of one blade as a Z axis, wherein the cutting direction is from the outer edge to the inner edge of the blade of the fixed guide vane; and all the fixed guide vanes are machined under one-time clamping.
Further, the processing method in step S05 adopts a depth profile processing method to generate a processing tool path, and performs a machine tool simulation dynamic simulation.
Further, the finishing in step S05 includes a semi-finishing step of removing a cutting amount remaining in the rough machining and a finishing step of smoothing the profile surface of the blade; where it is finished to the drawing size. The processing method and procedure in the step S05 are the same as those in the step S03.
Further, the finish machining in step S06 includes a semi-finish machining step of removing a cutting amount remaining in the rough machining step and a finish machining step of smoothing the profile surface of the fixed guide vane; where it is finished to the drawing size. The processing method and procedure in the step S06 are the same as those in the step S04.
Further, after the steps S01 to S07 are completed, the process proceeds to the steps of detecting, polishing, and spraying.
The invention has the beneficial effects that:
the processing method of the invention realizes the processing of the blade profile of the fixed guide blade of the integral casting seat ring of the water turbine, improves the processing precision of the blade profile of the fixed guide blade of the integral casting seat ring, improves the processing efficiency, saves the polishing cost and ensures the processing quality of the integral casting seat ring.
In the finish machining process in the machining method, the integral casting seat ring can be directly clamped on a worktable of a machining machine tool, and the used tool is simple and reliable; the depth profile milling method is adopted during processing of the water inlet edge of the fixed guide vane, so that the processing efficiency can be obviously improved, the surface roughness of a processed product is good, and the processing quality can be ensured.
Drawings
FIG. 1 is a three-dimensional schematic view of a water turbine block casting seat ring;
in the figure, 10 is an upper ring plate; 20-lower ring plate; 30-stationary vanes; 301-water outlet edge; 302-water inlet side.
Detailed Description
A technical solution of the embodiments of the present invention is further described in detail with reference to the accompanying drawings of the present invention.
In the present invention, unless otherwise specifically defined and limited, terms are to be construed broadly, and specific meanings of the terms in the present invention may be understood by those skilled in the art according to specific situations.
A method for processing a block casting seat ring, wherein the block casting seat ring comprises an upper ring plate 10, a lower ring plate 20 and a fixed guide vane 30, and comprises the following steps:
step S01, collecting cloud point data of the whole casting seat ring; the fixed guide vane 30 is composed of a plurality of blades which are uniformly distributed along the circumference, and the initial angle between the blades cannot be determined during processing; marking points are placed on the surfaces of the upper ring plate 10, the lower ring plate 20 and the fixed guide vanes 30 of the whole casting seat ring blank, a professional camera is adopted to take pictures of the whole casting seat ring in all directions, the pictures are imported into a computer for image processing, a three-dimensional model is established and fitted to generate the whole casting seat ring blank, and the initial angle for processing the fixed guide vanes 30 is determined.
Specifically, mark points are placed on the surfaces and the periphery of an upper ring plate 10, a lower ring plate 20 and a fixed guide vane 30 of a whole casting seat ring blank, the mark points comprise circular mark points, mark points with annular codes and global scale points, a professional camera is adopted to photograph the whole casting seat ring in all directions, and a picture containing the coded mark points, non-coded mark points and full-size information is obtained; then, the photographed sheet group is led into a computer for image processing, two-dimensional coordinates of the mark points in the photograph group are measured, three-dimensional coordinate points of all the mark points in the space are calculated according to the two-dimensional coordinates, all the mark points and a theoretical three-dimensional model are fitted to generate the blank allowance of the runner entity, 3 to 4 coordinate points are respectively selected as reference points of the processed blade on the water inlet edge 302 and the water outlet edge 301 of the surfaces of the upper ring plate 10, the lower ring plate 20 and the fixed guide blade 30 of the whole casting seat ring, and then the initial angle of the processed fixed guide blade 30 is determined.
Step S02, roughly machining the end faces and the inner contour lines of the upper ring plate 10 and the lower ring plate 20 by a vertical lathe; the inner circle outline blank of the whole casting seat ring is ensured to be uniform, and the accurate size is conveniently measured.
Step S03, roughly machining the blade water outlet edge 301 of the fixed guide vane 30 by using a gantry milling machine; the processing method adopts a depth profile processing mode, firstly generates a processing cutter track in a computer, carries out simulation dynamic simulation on a machine tool cutter, and then sends information to a gantry milling machine tool for processing; taking the end surface of the lower ring plate as a clamping and positioning surface, aligning the whole casting seat ring according to the reference point coordinate of the water outlet edge 301, and then processing the outline of the blade water outlet edge 301 of the fixed guide vane 30; the processing mode of processing the blade edge of leaving water 301 of stationary guide vane 30 adopts the degree of depth profile to mill, installs omnipotent annex in lathe main shaft department, rotates the arbor angle according to the horizontal contained angle between stationary guide vane 30 array angle and the arbor, processes overlapping between the adjacent stationary guide vane 30 and shelters from the position, and the cutting direction is by the outward flange to the inward flange of stationary guide vane 30's blade, every angle that the machine tool ann can the annex is adjusted to stationary guide vane 30 of processing.
Step S04, roughly machining the blade water inlet edge 302 of the fixed guide vane 30 by a boring and milling machine; the boring-milling machine is a numerical control boring-milling machine with a rotary worktable; placing the whole casting seat ring on a rotary worktable, and processing the surface of the fixed guide vane 30 by adjusting an included angle between the surface of the fixed guide vane 30 and a cutter shaft by taking a rotary center as a zero point; and a workpiece coordinate system is established by taking the rib line of one blade as a Z axis, the cutting direction is from the outer edge to the inner edge of the blade of the fixed guide vane 30, and all the fixed guide vanes are machined under one-time clamping.
Specifically, after the blade of one fixed guide vane 30 is machined, the cutter returns to the safety plane, then the workbench is rotated, and according to the number of the blades, the blade surface of the fixed guide vane 30 is cut layer by layer from the outer edge to the inner edge every time the workbench rotates by an angle, and all the blades are machined under one-time clamping.
Step S05, finish machining the blade water outlet edge 301 of the fixed guide vane 30 by a gantry mill; the method comprises the steps of semi-finishing and finishing, wherein the semi-finishing and the finishing both adopt a depth profile milling mode to generate a machining tool track, and the simulation dynamic simulation of a machine tool is carried out; and removing the cutting amount remained by rough machining by semi-finishing, and finishing the profile surface of the fixed guide vane smoothly by finishing to the drawing size. The processing method and procedure in step S05 are the same as those in step S03.
Step S06, finely machining the blade water inlet edge 302 of the fixed guide vane 30 by a boring and milling machine; the finish machining in the step S06 comprises a semi-finish machining process and a finish machining process, wherein the semi-finish machining process is used for removing the cutting amount remained in the rough machining process, and the finish machining process is used for smoothing the profile surface of the fixed guide vane; where it is finished to the drawing size. The processing method and procedure in step S06 are the same as those in step S04.
Step S07, finish machining end faces and inner contour lines of the upper ring plate 10 and the lower ring plate 20 by a turning and milling machining center; and (5) performing finish machining to the size of the drawing.
And after the steps S01 to S07 are completed, the process is shifted to the working procedures of detection, polishing and spraying. And after the detection area is measured to be qualified by using a laser instrument, the detection area is transferred to a polishing area for surface polishing, and the workpiece is cleaned by using washing oil.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. A machining method for a block casting seat ring comprises an upper ring plate, a lower ring plate and a fixed guide vane, and is characterized by comprising the following steps:
step S01, collecting cloud point data of the whole casting seat ring;
step S02, roughly machining end faces and inner contour lines of an upper ring plate and a lower ring plate by a vertical lathe;
step S03, roughly machining the blade water outlet edge of the fixed guide vane by a gantry milling machine;
step S04, roughly machining the water inlet edge of the fixed guide vane by a boring and milling machine;
step S05, finish machining the blade water outlet edge of the fixed guide vane by a gantry mill;
step S06, finely machining the water inlet edge of the fixed guide vane by a boring and milling machine;
and step S07, finishing the end faces and the inner contour lines of the upper ring plate and the lower ring plate by a turning and milling machining center.
2. The method for machining the integral casting seat ring according to claim 1, wherein the step S01 is specifically to place mark points on the surfaces of an upper ring plate, a lower ring plate and fixed guide vanes of the blank of the integral casting seat ring, take a picture of the integral casting seat ring in all directions by using a professional camera, import the picture into a computer for image processing, establish a three-dimensional model and fit the three-dimensional model to generate the blank of the integral casting seat ring, and determine the starting angle for machining the fixed guide vanes.
3. The machining method of the block casting seat ring according to claim 1, wherein the machining method in the step S03 adopts a depth profile machining mode, a machining tool track is generated, and simulation dynamic simulation of a machine tool is carried out.
4. The method for machining the integrally cast seat ring as claimed in claim 3, further comprising the steps of taking the end face of the lower ring plate as a clamping and positioning face, aligning the integrally cast seat ring according to the datum point coordinate of the water outlet edge, and then machining the contour of the water outlet edge of the blade of the fixed guide vane.
5. The method of machining a block seat ring according to claim 1, wherein the boring and milling machine in the step S04 is a numerically controlled boring and milling machine with a rotary table.
6. The machining method of the block casting seat ring according to claim 5, wherein the step S04 is specifically that the block casting seat ring is placed on a rotary worktable, the surface of the fixed guide vane is machined by adjusting an included angle between the surface of the fixed guide vane and a cutter shaft with a rotary center as a zero point; and establishing a workpiece coordinate system by taking the rib line of one blade as a Z axis, wherein the cutting direction is from the outer edge to the inner edge of the blade of the fixed guide vane.
7. The machining method of the block casting seat ring according to claim 1, wherein the machining method in the step S05 adopts a depth profile machining mode, a machining tool track is generated, and simulation dynamic simulation of a machine tool is carried out.
8. The block seat ring machining method according to claim 7, wherein the finish machining in step S05 includes a semi-finish machining step of removing a cutting amount remaining in the rough machining step and a finish machining step of smoothing the profile surface of the stationary vane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127662.0A CN111331318A (en) | 2020-02-28 | 2020-02-28 | Method for processing integrally cast seat ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127662.0A CN111331318A (en) | 2020-02-28 | 2020-02-28 | Method for processing integrally cast seat ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111331318A true CN111331318A (en) | 2020-06-26 |
Family
ID=71175876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010127662.0A Pending CN111331318A (en) | 2020-02-28 | 2020-02-28 | Method for processing integrally cast seat ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111331318A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103317171A (en) * | 2012-03-23 | 2013-09-25 | 东方电气集团东方电机有限公司 | Large-sized water turbine blade multi-shaft linkage numerical control machining method based on casting roughcast |
| US20160237826A1 (en) * | 2015-02-17 | 2016-08-18 | United Technologies Corporation | Method of processing unfinished surfaces |
| CN107632845A (en) * | 2017-09-04 | 2018-01-26 | 昆明理工大学 | A kind of integrated knowledge cloud service method and system of the processing of runner bucket multi-axis milling |
| EP3431211A1 (en) * | 2017-07-20 | 2019-01-23 | General Electric Company | Method for manufacturing a hybrid article |
| CN109396764A (en) * | 2018-11-17 | 2019-03-01 | 共享智能装备有限公司 | A kind of processing method of mixed-flow block cast runner |
-
2020
- 2020-02-28 CN CN202010127662.0A patent/CN111331318A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103317171A (en) * | 2012-03-23 | 2013-09-25 | 东方电气集团东方电机有限公司 | Large-sized water turbine blade multi-shaft linkage numerical control machining method based on casting roughcast |
| US20160237826A1 (en) * | 2015-02-17 | 2016-08-18 | United Technologies Corporation | Method of processing unfinished surfaces |
| EP3431211A1 (en) * | 2017-07-20 | 2019-01-23 | General Electric Company | Method for manufacturing a hybrid article |
| CN107632845A (en) * | 2017-09-04 | 2018-01-26 | 昆明理工大学 | A kind of integrated knowledge cloud service method and system of the processing of runner bucket multi-axis milling |
| CN109396764A (en) * | 2018-11-17 | 2019-03-01 | 共享智能装备有限公司 | A kind of processing method of mixed-flow block cast runner |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111195830B (en) | Digital thinning processing method for large thin-wall barrel part | |
| KR101155055B1 (en) | Raster cutting technology for ophthalmic lenses | |
| Kim et al. | Texture prediction of milled surfaces using texture superposition method | |
| CN107253102A (en) | A kind of precision grinding machining method of special-shaped thin wall labyrinth workpiece | |
| CN101000499A (en) | Contour machining method and system based on multi-sensor integral measuring | |
| CN109396764A (en) | A kind of processing method of mixed-flow block cast runner | |
| CN113385900B (en) | Measurement-milling-deburring-grinding-polishing integrated casing machining device and method | |
| EP3457237B1 (en) | Method and machine equipment for manufacturing of a cutting tool | |
| CN111830900B (en) | Interference-free tool path generation method for grinding and polishing blisk by robot | |
| CN112264842B (en) | Constant linear velocity grinding method based on polar coordinate glass edge grinding machine | |
| US6449529B1 (en) | Process for contour machining of metal blocks | |
| CN110587391A (en) | Five-axis numerical control woodworking hard alloy cutter grinding machine | |
| CN103551931A (en) | Numerically-controlled double-headed and single-sided special grinder for grinding knives and scissors | |
| EP3437799A1 (en) | Machine tool and method for machining high precision cutting tools | |
| CN111331318A (en) | Method for processing integrally cast seat ring | |
| CN106077775B (en) | A kind of processing method of three axis machine tooling back-off class workpiece | |
| CN101298104A (en) | Method for milling turbo wheel | |
| CN110524318A (en) | A kind of blade machining process | |
| ZA200205855B (en) | A process for contour control machining of metal blocks. | |
| CN101424934A (en) | Skew axis aspherical mirror processing system and method | |
| JP2005028556A (en) | Machining method of free curved surface | |
| CN114799294B (en) | Device for machining complex surface-shaped spheres in multiple steps and repeated positioning method thereof | |
| CN116237855B (en) | Processing method of anodic oxide layer at edge of rocket storage tank annular part | |
| CN110091135B (en) | Small R-angle deep groove machining process for military inertial navigation metal structural part | |
| EP3855263A1 (en) | Method and system for chamfering gear wheel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200626 |
|
| RJ01 | Rejection of invention patent application after publication |