CN115194416A - Nozzle blade machining method - Google Patents
Nozzle blade machining method Download PDFInfo
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- CN115194416A CN115194416A CN202210992762.9A CN202210992762A CN115194416A CN 115194416 A CN115194416 A CN 115194416A CN 202210992762 A CN202210992762 A CN 202210992762A CN 115194416 A CN115194416 A CN 115194416A
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- nozzle
- nozzle blade
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- blade
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
Abstract
The invention relates to a method for processing a nozzle blade, in particular to a method for processing a nozzle blade, which aims to improve the method for processing the nozzle blade so that a single blade after being processed can reach the clearance value and the throat size required by assembly. The quality and the efficiency of nozzle assembly are improved. The method is realized according to the following steps: the method comprises the following steps: processing a nozzle blade blank; step two: processing the inner arc of the nozzle blade; step three: processing a nozzle blade assembly back arc; milling the assembly back arc of the nozzle blade, performing fitting on the machined nozzle blade on a fitting tool, closely attaching the outer circular arc of the nozzle blade to the positioning circular arc surface of the fitting tool, placing two groups of blades, detecting the gap between two adjacent blades to meet the requirement of an assembly drawing, and calculating the distances of lines with the intersection distance of a plane 20mm away from the steam inlet side and the assembly back arc of 30 degrees and 60 degrees to detect that the accumulated pitch of each group of blades meets the assembly requirement; step four: and (4) processing a nozzle blade steam passage. The invention belongs to the field of blade processing.
Description
Technical Field
The invention relates to a blade machining method, in particular to a nozzle blade machining method, and belongs to the field of blade machining.
Background
After every single nozzle blade processing, there is the unqualified condition in clearance often when the assembly, for guaranteeing the clearance, need pincers to repair, the blade magnitude of interference after pincers are repaiied is not enough, often needs the preparation thickening piece to adjust, nevertheless owing to only assemble the back of the body arc and thicken, the steam passage back of the body arc does not have the thickening, and throat size is out of tolerance when leading to the assembly. On the other hand, when the blade is used for processing the back arc of the steam passage, a three-axis device is adopted for processing, the circular arcs of the steam inlet and the steam inlet edge of the steam passage need to be controlled by sequential cutter connection, the processing period is long, and the precision is low. Innovations are needed to provide new processing methods.
Disclosure of Invention
The invention aims to improve a processing method of a nozzle blade, so that a single blade after being processed reaches a clearance value and a throat size required by assembly. The quality and the efficiency of nozzle assembly are improved. Further, it is desirable to provide a method for machining a nozzle vane.
The method is realized according to the following steps:
the method comprises the following steps: processing a nozzle blade blank: placing the blank on a linear cutting device, processing the nozzle blade blank by using the linear cutting device according to the shape of the nozzle blade, wherein processing amount is reserved in a nozzle assembly inner arc and a nozzle assembly back arc of the nozzle blade during linear cutting processing, and the allowance of a steam passage part is flush with the surface of an assembly back arc blank;
step two: processing the inner arc of the nozzle blade: placing the nozzle blade blank material processed in the step one on a milling machine for processing, and processing the inner arc of the nozzle blade by using an inner arc type line corner milling cutter;
step three: processing a nozzle blade assembly back arc: calculating the maximum allowable thickening amount of the nozzle blade assembly back arc pitch according to the difference of the dimensional tolerance of the nozzle blade throat part in the drawing, establishing a theoretical data model through software, manufacturing intersecting lines of a pitch circular cylindrical surface and a steam passage back arc and an assembly back arc respectively, calculating the minimum distance of the two intersecting lines, namely the throat part dimension X, and translating the assembly back arc along the steam inlet side Y axis by 0.5mm which is supposed; calculating the maximum allowable thickening amount of a single blade according to a formula;
milling the assembly back arc of the nozzle blade, performing fitting on the machined nozzle blade on a fitting tool, closely attaching the outer circular arc of the nozzle blade to the positioning circular arc surface of the fitting tool, placing two groups of blades, detecting the gap between two adjacent blades to meet the requirement of an assembly drawing, and calculating the distances of lines with the intersection distance of a plane 20mm away from the steam inlet side and the assembly back arc of 30 degrees and 60 degrees to detect that the accumulated pitch of each group of blades meets the assembly requirement;
step four: processing a nozzle blade steam passage: the arc surfaces at the two ends of the blade are accurately turned, so that the nozzle blade cannot be installed on a universal fixture for steam passage processing, the nozzle blade is fixed on the fixture for steam passage processing through the inner arc positioning block, thimble holes at the two ends of the fixture for steam passage processing are installed on thimbles of a five-axis machine tool, the steam passage of the nozzle blade is processed, and the integrated processing of the steam inlet, the steam passage and the steam inlet edge arc of the nozzle blade is completed.
The invention has the beneficial effects that: 1. the method comprises the steps of sequentially processing an assembly inner arc and an assembly back arc, measuring the gap and the pitch of the assembly inner arc and the assembly back arc on a brushing tool, calculating a pitch size enlargeable value according to the difference of the maximum thickness of a steam passage, and using the pitch size enlargeable value as a control basis of the thickening amount of a nozzle blade; and the steam passage back arc is machined by adopting a five-axis machine tool, because the arc surfaces at the two ends of the blade are accurately turned, the blade cannot be clamped by adopting a mode that the process heads are reserved at the two ends for topping pinholes, a clamp for clamping during steam passage machining is designed, the machined blade is used for detecting the size of the throat by adopting a matched tool again, and the qualified size of the throat is ensured. Through improving, improved nozzle vane assembly quality and efficiency, be worth promoting.
Drawings
FIG. 1 is a front view of a brushing tool used in the present invention;
FIG. 2 is a schematic view of a nozzle vane disposed on a brushing tool;
figure 3 is an inside curve type corner milling cutter for use in the present invention,
FIG. 4 is a side view of an inner arc type corner milling cutter; the value of the inner arc type line angle A is 38 degrees and 20';
FIG. 5 is a special fixture for fixing a nozzle vane during steam passage processing, wherein reference numeral 1 is a molded line cushion block, reference numeral 2 is an inner hexagonal socket head screw, reference numeral 3 is a cylindrical pin, reference numeral 4 is a bottom plate, reference numeral 5 is a stud bolt connecting piece, reference numeral 6 is a first pressing plate, and reference numeral 7 is a second pressing plate;
fig. 6 is a top view of fig. 5.
Fig. 7 is a front view of the nozzle vane, in which reference a is a pitch circle arc surface.
Fig. 8 is a top view developed along the pitch circle section, where the reference b is the intersection of the pitch circle cylindrical surface and the fitting back arc. e is the intersection line of the pitch circle cylindrical surface and the steam passage back arc.
FIG. 9 is a top view taken along the sectional view of a pitch circle, wherein d is the intersection line of the pitch arc surface and the assembly back arc with a translation distance c along the Y-axis of the steam inlet side, the value of c is 0.5mm, and f is the intersection line of the pitch arc surface and the steam passage back arc.
Detailed Description
The first specific implementation way is as follows: the present embodiment will be described with reference to fig. 1 to 9, and the method for machining a nozzle vane according to the present embodiment is implemented by the following steps:
the method comprises the following steps: processing a nozzle blade blank: placing the blank on a linear cutting device, processing the nozzle blade blank by the linear cutting device according to the shape of the nozzle blade, wherein processing amount is reserved on a nozzle assembly inner arc and a nozzle assembly back arc of the nozzle blade during linear cutting processing, and the allowance of a steam passage part is flush with the surface of an assembly back arc blank;
the linear cutting equipment manufacturer is a numerical control linear cutting machine tool with the model number of DK7750AZ of Jiangsu Samsung mechanical manufacturing company Limited, and the cutting parameters are as follows: pulse width 48. Mu.s, current: 2A, voltage: 90V, wire feeding speed: 60mm 2 /min。
Step two: processing the inner arc of the nozzle blade: placing the nozzle blade blank material processed in the step one on a milling machine, horizontally placing an inner arc molded line bus, placing an inner arc molded line to a designed turning angle of a special molded line milling cutter, feeding the special molded line milling cutter along the direction of the inner arc bus for processing, and processing the inner arc of the nozzle blade by using the turning angle special inner arc molded line milling cutter; the special profile milling cutter is designed with a corner, so that the profile of a cutting edge is as horizontal as possible during milling, the cutting force is uniform, and the surface finish tolerance caused by vibration is reduced;
using a horizontal lifting platform milling machine, performing rough milling to leave a margin of 0.2-0.3mm for finish milling, and performing rough milling (reverse milling): main shaft rotation speed: 30-50 rpm, feed rate: 30-60 mm/min, cutting depth: 0.5-1mm, finish milling (down milling): feeding in two steps: main shaft rotation speed: 130-150 rpm, feed rate: 85-100 mm/min, cutting depth: 0.1-0.3mm, smooth knife: main shaft rotation speed: 130-150 rpm, feed rate: 85-100 mm/min, cutting depth: 0.05-0.1mm;
step three: processing a nozzle blade assembly back arc: calculating the maximum allowable thickening amount of the nozzle blade assembly back arc pitch according to the difference of the dimensional tolerance of the nozzle blade throat in the drawing, establishing a theoretical data model through software, manufacturing intersecting lines of the pitch circular cylindrical surface and the steam passage back arc and the assembly back arc respectively, calculating the minimum distance of the two intersecting lines, namely the throat size X, and then translating the assembly back arc along the steam inlet side Y axis by an assumed 0.5mm; calculating the maximum allowable thickening amount of a single blade according to a formula;
here, UG software was used to build theoretical data models;
milling the assembly back arc of the nozzle blade, performing brush fitting on the machined nozzle blade on a brush fitting tool, attaching the outer circular arc of the nozzle blade to the positioning circular arc surface of the brush fitting tool, placing two groups of blades, detecting the gap between two adjacent blades to meet the requirement of an assembly drawing, and calculating the distances of scribed lines with the distance of 30 degrees and 60 degrees from the intersection line of a plane 20mm away from the steam inlet side and the assembly back arc to detect that the accumulated pitch of each group of blades meets the assembly requirement;
step four: processing a nozzle blade steam passage: the arc surfaces at the two ends of the blade are accurately turned, so that the nozzle blade cannot be installed on a universal fixture for steam passage processing, the nozzle blade is fixed on the fixture for steam passage processing through the inner arc positioning block, thimble holes at the two ends of the fixture for steam passage processing are installed on thimbles of a five-axis machine tool, the steam passage of the nozzle blade is processed, and the integrated processing of the steam inlet, the steam passage and the steam inlet edge arc of the nozzle blade is completed.
The second embodiment is as follows: in the nozzle vane machining method according to the present embodiment, the machining amount of the nozzle assembly inner arc of the nozzle vane is set to 1.5mm and the machining amount of the nozzle assembly back arc of the nozzle vane is set to 1.5mm in the first step of the center line cutting machining, which is described with reference to fig. 1 to 2. The other methods are the same as those in the first embodiment.
The third concrete implementation mode: referring to fig. 3 and 4, in the nozzle vane machining method according to this embodiment, the inner arc type line corner of the inner arc type line corner milling cutter used in the second step is 38 ° 20'. The other methods are the same as those in the first embodiment.
The fourth concrete implementation mode: the present embodiment will be described with reference to fig. 1 to 6, and a nozzle vane machining method according to the present embodiment is a method for machining an assembly back arc of a nozzle vane by a horizontal type elevating table milling machine in step three. The horizontal type elevating platform milling machine manufacturer is a first machine tool factory of Beijing, and the model of the machine tool is B1-400P. Horizontally placing a back arc type line bus, feeding a line milling cutter along the direction of the back arc bus for processing, performing rough milling to leave a margin of 0.2-0.3mm for finish milling, and performing rough milling (reverse milling): main shaft rotating speed: 30-50 rpm, feed rate: 30-50 mm/min, cutting depth: 1-3mm, finish milling (down milling): dividing into two parts, feeding: main shaft rotation speed: 40-50 rpm, feed rate: 50-60 mm/min, cutting depth: 0.2mm, smooth knife: main shaft rotation speed: 130-140 rpm, feed rate: 100-110 mm/min, cutting depth: 0.05-0.1mm. The other methods are the same as those in the first embodiment.
The fifth concrete implementation mode is as follows: in the method for machining a nozzle vane according to this embodiment, the number of thickened pieces calculated by the formula in the third step is calculated by making the intersecting line of the pitch circle cylindrical surface with the steam path back arc and the assembly back arc, respectivelyCalculating the minimum distance between two intersecting lines, namely the throat size X, then translating the assembly back arc along the Y axis of the steam inlet side by 0.5mm, calculating the throat size Y, wherein the upper difference of the throat sizes is 0.1, and the thickening amount of the thickening sheet is
The assembly half-turn needs 3-4mm adjustment, so that 4 is required to be manufactured and divided by 4
And a thickening sheet. The other methods are the same as those in the first embodiment.
The sixth specific implementation mode: in the nozzle blade machining method according to the present embodiment, the back arc machining and assembling is performed by using a 60 ° arc-shaped machining tool provided in the radial direction, extending 5mm from each end of the machining tool, and drawing two 30 ° graduation lines on the machining disk. The other methods are the same as those in the first embodiment.
Claims (6)
1. A nozzle vane machining method is characterized in that: the method is realized according to the following steps:
the method comprises the following steps: processing a nozzle blade blank: placing the blank on a linear cutting device, processing the nozzle blade blank by using the linear cutting device according to the shape of the nozzle blade, wherein processing amount is reserved in a nozzle assembly inner arc and a nozzle assembly back arc of the nozzle blade during linear cutting processing, and the allowance of a steam passage part is flush with the surface of an assembly back arc blank;
step two: processing the inner arc of the nozzle blade: placing the nozzle blade blank material processed in the step one on a milling machine for processing, and processing the inner arc of the nozzle blade by using an inner arc type line corner milling cutter;
step three: processing a nozzle blade assembly back arc: calculating the maximum allowable thickening amount of the nozzle blade assembly back arc pitch according to the difference of the dimensional tolerance of the nozzle blade throat in the drawing, establishing a theoretical data model through software, manufacturing intersecting lines of the pitch circular cylindrical surface and the steam passage back arc and the assembly back arc respectively, calculating the minimum distance of the two intersecting lines, namely the throat size X, and then translating the assembly back arc along the steam inlet side Y axis by an assumed 0.5mm; calculating the maximum allowable thickening amount of a single blade according to a formula;
milling the assembly back arc of the nozzle blade, performing fitting on the machined nozzle blade on a fitting tool, closely attaching the outer circular arc of the nozzle blade to the positioning circular arc surface of the fitting tool, placing two groups of blades, detecting the gap between two adjacent blades to meet the requirement of an assembly drawing, and calculating the distances of lines with the intersection distance of a plane 20mm away from the steam inlet side and the assembly back arc of 30 degrees and 60 degrees to detect that the accumulated pitch of each group of blades meets the assembly requirement;
step four: processing a nozzle blade steam passage: the nozzle blade cannot be installed on a universal fixture for steam passage machining due to the fact that arc surfaces at two ends of the blade are turned accurately, the nozzle blade is fixed on the fixture for steam passage machining through the inner arc positioning block, thimble holes at two ends of the fixture for steam passage machining are installed on thimbles of a five-axis machine tool, the steam passage of the nozzle blade is machined, and integrated machining of a steam inlet, a steam passage and a steam inlet edge arc of the nozzle blade is completed.
2. The nozzle vane machining method according to claim 1, characterized in that: in the first step, during the center line cutting process, the processing amount of the nozzle assembly inner arc of the nozzle blade is reserved for 1.5mm, and the processing amount of the nozzle assembly back arc of the nozzle blade is reserved for 1.5mm.
3. The nozzle vane machining method according to claim 1, characterized in that: in the second step, the inner arc type line corner of the milling cutter with the inner arc type line corner is 38 degrees and 20 degrees.
4. The nozzle vane machining method according to claim 1, characterized in that: and in the third step, the assembly back arc of the nozzle blade is processed by a horizontal lifting platform milling machine.
5. The nozzle vane machining method according to claim 1, characterized in that: in the third step, the number of thickened plates is calculated according to a formula in the following way, and the thickened plates are respectively connected with the back arc of the steam passage and the assembly back by manufacturing the pitch circle cylindrical surfaceCalculating the minimum distance between two intersecting lines, namely the throat size X, then translating the assembled back arc along the Y axis of the steam inlet side by an assumed 0.5mm, calculating the throat size Y, wherein the size upper difference of the throat is 0.1, and the thickening amount of the thickened piece is
The half-turn of the assembly needs 3-4mm adjustment, so that 4 is required to be divided by 4
And a thickening sheet.
6. The nozzle vane machining method according to claim 1, characterized in that: when the back arc is machined and assembled, the fitting tool is a 60-degree arc fitting tool arranged along the radial direction, the two ends of the fitting tool are respectively extended by 5mm, and two 30-degree division lines are respectively drawn on the fitting disc.
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| CN202210992762.9A CN115194416B (en) | 2022-08-18 | 2022-08-18 | Nozzle blade machining method |
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