CN115194416B - Nozzle blade machining method - Google Patents
Nozzle blade machining method Download PDFInfo
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- CN115194416B CN115194416B CN202210992762.9A CN202210992762A CN115194416B CN 115194416 B CN115194416 B CN 115194416B CN 202210992762 A CN202210992762 A CN 202210992762A CN 115194416 B CN115194416 B CN 115194416B
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- nozzle
- arc
- machining
- blade
- assembly
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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 application discloses a processing method of a nozzle blade, which relates to a processing method of a blade, and aims to improve the processing method of the nozzle blade, so that a single processed blade can reach a clearance value and a throat size required by assembly. The quality and efficiency of nozzle assembly are improved. The method is realized according to the following steps: step one: machining a nozzle vane blank; step two: machining an inner arc of a nozzle blade; step three: machining a back arc of the nozzle blade assembly; milling an assembled back arc of the nozzle blade, wherein the processed nozzle blade is matched on a matching tool, the outer arc of the nozzle blade is tightly attached to a positioning arc surface of the matching tool, two groups of blades are placed, gaps between two adjacent blades are detected to meet the requirement of an assembly drawing, and the distance between a plane 20mm away from the steam inlet side and an intersecting line of the assembled back arc is calculated to be 30 degrees and 60 degrees from a dividing line so as to detect that the accumulated pitch of each group of blades meets the requirement of the assembly; step four: and machining a nozzle vane steam passage. The application belongs to the field of blade processing.
Description
Technical Field
The application relates to a blade processing method, in particular to a nozzle blade processing method, and belongs to the field of blade processing.
Background
After each single nozzle blade is processed, a gap failure condition often exists in the process of assembly, in order to ensure the gap, the clamping is needed, the interference of the blade after the clamping is insufficient, a thickened sheet is often needed to be manufactured for adjustment, but the back arc of a steam channel is not thickened due to the fact that only the back arc of the assembly is thickened, and the size of the throat is out of tolerance in the process of assembly. On the other hand, when the blade is processed by adopting triaxial equipment during the back arc of the steam passage, the steam inlet and the steam inlet edge arc of the steam passage are controlled by the separate sequence knife, so that the processing period is long and the accuracy is low. There is a need to innovate new processing methods.
Disclosure of Invention
The application aims to improve a processing method of a nozzle blade, so that a single processed blade can reach a clearance value and a throat size required by assembly. The quality and efficiency of nozzle assembly are improved. It is further desirable to provide a method of nozzle vane machining.
The method is realized according to the following steps:
step one: machining nozzle vane blanks: placing the blank on a linear cutting device, processing a nozzle blade blank by using the linear cutting device according to the shape of the nozzle blade, wherein the inner arc of nozzle assembly and the back arc of nozzle assembly of the nozzle blade are reserved with processing amount during linear cutting processing, and the residual of the steam passage part is flush with the surface of the blank of the back arc assembly;
step two: machining an inner arc of a nozzle blade: placing the blank material of the nozzle blade processed in the first step on a milling machine for processing, and processing the inner arc of the nozzle blade by using an inner arc molded line corner milling cutter;
step three: machining a back arc of nozzle blade assembly: calculating the maximum allowable thickening amount of the back arc pitch of the nozzle blade assembly according to the upper difference of the throat size tolerance of the drawing of the nozzle blade, establishing a theoretical data model through software, manufacturing intersecting lines of a pitch circle cylindrical surface and a steam passage back arc and the back arc assembly respectively, calculating the minimum distance between the two intersecting lines, namely the throat size X, and translating the back arc assembly along the Y axis of the steam inlet side by 0.5mm; calculating the maximum allowable thickening amount of a single blade according to a formula;
milling an assembled back arc of the nozzle blade, wherein the processed nozzle blade is matched on a matching tool, the outer arc of the nozzle blade is tightly attached to a positioning arc surface of the matching tool, two groups of blades are placed, gaps between two adjacent blades are detected to meet the requirement of an assembly drawing, and the distance between a plane 20mm away from the steam inlet side and an intersecting line of the assembled back arc is calculated to be 30 degrees and 60 degrees from a dividing line so as to detect that the accumulated pitch of each group of blades meets the requirement of the assembly;
step four: machining a nozzle vane steam passage: because the arc surfaces at the two ends of the blade are turned accurately, the nozzle blade cannot be installed on a general steam passage machining clamp, the nozzle blade is fixed on the steam passage machining clamp through an inner arc positioning block, the top pin holes at the two ends of the steam passage machining clamp are installed on a five-axis machine tool thimble, the steam passage of the nozzle blade is machined, and the integrated machining of the steam inlet, the steam passage and the steam inlet edge arc of the nozzle blade is completed.
The beneficial effects of the application are as follows: 1. the method comprises the steps of sequentially machining and assembling an inner arc and a machining and assembling a back arc, measuring the gap and the pitch of the inner arc on a brushing tool, and calculating an amplified value of the pitch size according to the maximum thickness upper difference of a steam channel to be used as a control basis for the thickening amount of a nozzle blade; and the five-axis machine tool is adopted to process the back arc of the steam passage, and because the arc surfaces at the two ends of the blade are already turned, the clamping cannot be carried out in a mode that the process heads at the two ends are reserved to punch a top pin hole, the clamping is carried out by designing a clamp in the process of processing the steam passage, and the processed blade adopts a brushing tool to detect the throat size again, so that the throat size is ensured to be qualified. Through the improvement, the assembly quality and efficiency of the nozzle blade are improved, and the method is worthy of popularization.
Drawings
FIG. 1 is a front view of a fitting tool for use in the present application;
FIG. 2 is a schematic illustration of a nozzle vane disposed on a flick tool;
figure 3 is an inner arc type line corner milling cutter used in the present application,
FIG. 4 is a side view of an inner arc wire corner milling cutter; the value of the inner arc line corner A is 38 degrees 20';
FIG. 5 is a special fixture for fixing nozzle vanes during steam passage machining, wherein reference numeral 1 is a molded line cushion block, an accessory 2 is a hexagon socket head cap screw, an icon 3 is a cylindrical pin, a reference numeral 4 is a bottom plate, a reference numeral 5 is a double-end stud connector, a reference numeral 6 is a first pressing plate, and a 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, with reference a being a pitch arc surface.
Fig. 8 is a plan view taken along the section of the pitch circle, with reference b being the intersection of the cylindrical surface of the pitch circle with the back of the assembly. And e is the intersection line of the pitch cylinder surface and the back arc of the steam passage.
Fig. 9 is a plan view of the section of the pitch circle, wherein d is the intersection of the pitch arc surface and the back arc of the assembly with a translation distance c along the Y axis of the steam inlet side, c is 0.5mm, and f is the intersection of the pitch arc surface and the back arc of the steam channel.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 9, and the method for machining a nozzle vane according to the present embodiment is implemented by:
step one: machining nozzle vane blanks: placing the blank on a linear cutting device, processing a nozzle blade blank by using the linear cutting device according to the shape of the nozzle blade, wherein the inner arc of nozzle assembly and the back arc of nozzle assembly of the nozzle blade are reserved with processing amount during linear cutting processing, and the residual of the steam passage part is flush with the surface of the blank of the back arc assembly;
the wire cutting equipment manufacturer is limited in Jiangsu three-star machine manufacturingThe model DK7750AZ numerical control linear cutting machine comprises the following cutting parameters: pulse width 48 μs, current: 2A, voltage: 90V, wire feeding speed: 60mm 2 /min。
Step two: machining an inner arc of a nozzle blade: placing the blank material of the nozzle blade processed in the first step on a milling machine, horizontally placing the bus of the inner arc molded line, placing the inner arc molded line to the design corner of a special molded line milling cutter, feeding the special molded line milling cutter along the direction of the bus of the inner arc for processing, and processing the inner arc of the nozzle blade by using the special inner arc molded line milling cutter with a rotating angle; the special molded line milling cutter is designed to have the corner, so that the molded line of the cutting edge is as horizontal as possible during milling, the cutting force is uniform, and the surface finish degree out of tolerance caused by vibration is reduced;
using a horizontal lifting table milling machine, carrying out rough milling to leave a margin of 0.2-0.3mm for finish milling, and carrying out rough milling (back milling): spindle rotational speed: 30-50 rpm, feed rate: 30-60 mm/min, depth of cut: 0.5-1mm, finish milling (down milling): feeding by two cutters: spindle rotational speed: 130-150 rpm, feed rate: 85-100 mm/min, cutting depth: 0.1-0.3mm, optical knife: spindle rotational speed: 130-150 rpm, feed rate: 85-100 mm/min, cutting depth: 0.05-0.1mm;
step three: machining a back arc of nozzle blade assembly: calculating the maximum allowable thickening amount of the back arc pitch of the nozzle blade assembly according to the upper difference of the throat size tolerance of the drawing of the nozzle blade, establishing a theoretical data model through software, manufacturing intersecting lines of a pitch circle cylindrical surface and a steam passage back arc and the back arc assembly respectively, calculating the minimum distance between the two intersecting lines, namely the throat size X, and translating the back arc assembly along the Y axis of the steam inlet side by 0.5mm; calculating the maximum allowable thickening amount of a single blade according to a formula;
the UG software is used for establishing a theoretical data model;
milling an assembled back arc of the nozzle blade, wherein the processed nozzle blade is matched on a matching tool, the outer arc of the nozzle blade is tightly attached to a positioning arc surface of the matching tool, two groups of blades are placed, gaps between two adjacent blades are detected to meet the requirement of an assembly drawing, and the distance between a plane 20mm away from the steam inlet side and an intersecting line of the assembled back arc is calculated to be 30 degrees and 60 degrees from a dividing line so as to detect that the accumulated pitch of each group of blades meets the requirement of the assembly;
step four: machining a nozzle vane steam passage: because the arc surfaces at the two ends of the blade are turned accurately, the nozzle blade cannot be installed on a general steam passage machining clamp, the nozzle blade is fixed on the steam passage machining clamp through an inner arc positioning block, the top pin holes at the two ends of the steam passage machining clamp are installed on a five-axis machine tool thimble, the steam passage of the nozzle blade is machined, and the integrated machining 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, a machining amount of 1.5mm is left in the inner arc of the nozzle assembly of the nozzle vane and a machining amount of 1.5mm is left in the back arc of the nozzle assembly of the nozzle vane during the wire cutting machining in the first step, will be described with reference to fig. 1 to 2. The other method is the same as in the first embodiment.
And a third specific embodiment: referring to fig. 3 and 4, a method for machining a nozzle vane according to the present embodiment is described, in which an inner arc line corner milling cutter is used in the second step, the inner arc line corner is 38 ° 20'. The other method is the same as in the first embodiment.
The specific embodiment IV is as follows: referring to fig. 1 to 6, a method for machining a nozzle vane according to the present embodiment is described, in which in step three, a horizontal lifting/lowering milling machine is used to machine the back arc of the nozzle vane. The manufacturer of the horizontal lifting table milling machine is produced by a Beijing first machine tool factory, and the model of the machine tool is B1-400P. And horizontally placing a back arc molded line busbar, feeding a molded line milling cutter along the back arc busbar direction for processing, and carrying out rough milling to leave a margin of 0.2-0.3mm for finish milling, wherein the rough milling (back milling) comprises the following steps: spindle rotational speed: 30-50 rpm, feed rate: 30-50 mm/min, depth of cut: 1-3mm, finish milling (down milling): two cutters are adopted, and the cutter is fed: spindle rotational speed: 40-50 rpm, feed rate: 50-60 mm/min, depth of cut: 0.2mm, optical knife: spindle rotational speed: 130-140 rpm, feed rate: 100-110 mm/min, depth of cut: 0.05-0.1mm. The other method is the same as in the first embodiment.
Fifth embodiment: referring to fig. 7 to 9, a method for machining a nozzle vane according to the present embodiment is described, and in the third stepThe number of the thickened sheets is calculated according to the formula, the minimum distance between the two intersecting lines, namely the throat size X, is calculated according to the intersecting lines of the cylindrical surface of the manufactured pitch circle with the back arc of the steam passage and the back arc of the assembly, the throat size Y is calculated by translating the back arc of the assembly along the Y axis of the steam inlet side by 0.5mm, the upper difference of the throat sizes is 0.1, and the thickening amount of the thickened sheets isThe half-turn is assembled with an adjustment of 3-4mm, so that it is necessary to make 4 divided by +.>And (5) adding thick plates. The other method is the same as in the first embodiment.
Specific embodiment six: in the method for machining a nozzle vane according to the present embodiment, a 60 ° arc-shaped mating tool is provided in a radial direction as the mating tool for machining and assembling the back arc, and two 30 ° graduation lines are drawn on the mating plate while extending 5mm at each end of the mating tool, respectively, as described in reference to fig. 1. The other method is the same as in the first embodiment.
Claims (6)
1. A nozzle vane processing method is characterized in that: the method is realized according to the following steps:
step one: machining nozzle vane blanks: placing the blank on a linear cutting device, processing a nozzle blade blank by using the linear cutting device according to the shape of the nozzle blade, wherein the inner arc of nozzle assembly and the back arc of nozzle assembly of the nozzle blade are reserved with processing amount during linear cutting processing, and the residual of the steam passage part is flush with the surface of the blank of the back arc assembly;
step two: machining an inner arc of a nozzle blade: placing the blank material of the nozzle blade processed in the first step on a milling machine for processing, and processing the inner arc of the nozzle blade by using an inner arc molded line corner milling cutter;
step three: machining a back arc of nozzle blade assembly: calculating the maximum allowable thickening amount of the back arc pitch of the nozzle blade assembly according to the upper difference of the throat size tolerance of the drawing of the nozzle blade, establishing a theoretical data model through software, manufacturing intersecting lines of a pitch circle cylindrical surface and a steam passage back arc and the back arc assembly respectively, calculating the minimum distance between the two intersecting lines, namely the throat size X, and translating the back arc assembly along the Y axis of the steam inlet side by 0.5mm; calculating the maximum allowable thickening amount of a single blade according to a formula;
milling an assembled back arc of the nozzle blade, wherein the processed nozzle blade is matched on a matching tool, the outer arc of the nozzle blade is tightly attached to a positioning arc surface of the matching tool, two groups of blades are placed, gaps between two adjacent blades are detected to meet the requirement of an assembly drawing, and the distance between a plane 20mm away from the steam inlet side and an intersecting line of the assembled back arc is calculated to be 30 degrees and 60 degrees from a dividing line so as to detect that the accumulated pitch of each group of blades meets the requirement of the assembly;
step four: machining a nozzle vane steam passage: because the arc surfaces at the two ends of the blade are turned accurately, the nozzle blade cannot be installed on a general steam passage machining clamp, the nozzle blade is fixed on the steam passage machining clamp through an inner arc positioning block, the top pin holes at the two ends of the steam passage machining clamp are installed on a five-axis machine tool thimble, the steam passage of the nozzle blade is machined, and the integrated machining of the steam inlet, the steam passage and the steam inlet edge arc of the nozzle blade is completed.
2. A method of machining a nozzle vane according to claim 1, wherein: in the first step, during the wire cutting processing, the processing amount is 1.5mm in the inner arc of the nozzle assembly of the nozzle blade, and the processing amount is 1.5mm in the back arc of the nozzle assembly of the nozzle blade.
3. A method of machining a nozzle vane according to claim 1, wherein: and in the second step, the inner arc line corner milling cutter is used, wherein the inner arc line corner is 38 degrees 20'.
4. A method of machining a nozzle vane according to claim 1, wherein: and thirdly, machining the assembled back arc of the nozzle blade through a horizontal lifting table milling machine.
5. A method of machining a nozzle vane according to claim 1, wherein: step by stepIn the third step, the number of the thickened sheets is calculated according to the following mode, according to the intersecting lines of the cylindrical surface of the manufactured pitch circle with the back arc of the steam passage and the back arc of the assembly, the minimum distance between the two intersecting lines, namely the throat size X, is calculated, the assembly back arc is translated along the Y axis of the steam inlet side to assume 0.5mm, the throat size Y is calculated, the difference of the throat sizes is 0.1, and the thickening amount of the thickened sheets isThe half-turn is assembled with an adjustment of 3-4mm, so that it is necessary to make 4 divided by +.>And (5) adding thick plates.
6. A method of machining a nozzle vane according to claim 1, wherein: the brushing tool is a 60-degree arc-shaped brushing tool arranged in the radial direction during machining and assembling of the back arc, two ends of the brushing tool are respectively prolonged by 5mm, and two 30-degree graduation lines are respectively drawn on the brushing disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210992762.9A CN115194416B (en) | 2022-08-18 | 2022-08-18 | Nozzle blade machining method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210992762.9A CN115194416B (en) | 2022-08-18 | 2022-08-18 | Nozzle blade machining method |
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| CN115194416A CN115194416A (en) | 2022-10-18 |
| CN115194416B true CN115194416B (en) | 2023-09-29 |
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Effective date of registration: 20230104 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Applicant after: HARBIN TURBINE Co.,Ltd. Applicant after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Applicant before: HARBIN TURBINE Co.,Ltd. |
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