CN114888702A - Numerical control polishing method for compressor blade - Google Patents
Numerical control polishing method for compressor blade Download PDFInfo
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- CN114888702A CN114888702A CN202210723766.7A CN202210723766A CN114888702A CN 114888702 A CN114888702 A CN 114888702A CN 202210723766 A CN202210723766 A CN 202210723766A CN 114888702 A CN114888702 A CN 114888702A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a numerical control polishing method for a compressor blade, which is used for polishing the blade after numerical control zero-allowance milling, wherein in the polishing process, the different positions of the blade body molded surface of the compressor blade are subjected to numerical control polishing in a vertical, segmented track-fixing and prepressing polishing mode, the different positions of the blade body molded surface comprise the back of a blade basin, a flange plate, a blade air inlet and outlet edge and a blade root switching arc, wherein the vertical mode means that the blade tip direction of the compressor blade points to the Z axis of a numerical control machine; the step of determining the track by sections is to divide a theoretical model entity of the compressor blade into a plurality of independent parts of a blade basin back, a flange plate, a blade air inlet and outlet edge and a blade root switching arc, establish a model and respectively customize a special and fixed feed path and a processing track; setting different prepressing amounts during prepressing; and combining the polishing tool (polishing wheel) with the model to generate polishing pre-pressing amount, and polishing by sections. The invention solves the difficult problem of mechanical numerical control polishing processing of the blade.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a method for carrying out numerical control polishing machining on a molded surface of a blade body of a compressor blade.
Background
The blade is one of the key parts on the aeroengine, and is required to bear great centrifugal force and airflow scouring after long-term operation in the environment with high temperature, high pressure and high revolution.
With the continuous improvement of the performance and power of an aero-engine, the quality requirement of the blade is extremely strict, and the final machining of the blade profile and the semi-finishing of part of the blade of the aero-engine still depend on the manual polishing machining mode at present, so that the problems of low part consistency, manufacturing conformity, surface integrity and the like are caused. For this reason, it is mainstream to adopt mechanized polishing instead of manual polishing in all aspects.
The fine engineering blade is milled without allowance, the blade body profile is slender and thin, the blade body curvature change is large, the edge plates are plane and arc surfaces, the arc radiuses of the front edge and the rear edge are small, the profile precision requirement is high, the blade material is usually high-temperature alloy and titanium alloy material, the consistency of the geometric precision and the position precision of the blade is not high enough due to manual polishing, the over-polishing and the front edge and the rear edge sharp edges are easy to occur, and the one-time fault detection rate is low.
At present, common mechanical polishing modes at home and abroad comprise abrasive belt grinding, robot polishing and the like, leaf basin and back polishing are realized, but the proficiency of the grinding and polishing technology for the edge plate and the switching arc is not high.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a numerical control polishing method for a compressor blade, and solves the problem of mechanical polishing processing of an aircraft engine blade.
The invention provides a numerical control polishing processing method for segmenting, fixing a track and prepressing a blade body profile of a blade.
In order to realize the purpose, the invention adopts the following technical scheme:
a numerical control polishing method for a compressor blade is used for polishing the blade after numerical control zero-allowance milling, and during polishing, different positions of a blade body profile of the compressor blade are subjected to numerical control polishing in a vertical, segmented track-fixing and prepressing polishing mode, wherein the different positions of the blade body profile comprise a blade basin back, a flange plate, a blade air inlet and outlet edge and a blade root switching arc, wherein,
the vertical type means that the blade tip direction of the compressor blade points to the Z axis of the numerical control machine;
the segmented orbit determination means that a theoretical model entity of a compressor blade is divided into a plurality of independent parts of a blade basin back, a flange plate, a blade air inlet and outlet edge and a blade root switching arc, a model is built, and a special and fixed feed path and a processing orbit are respectively customized;
during prepressing, different prepressing amounts are set according to the specification, the machining position, the machining size and the roughness design requirement of the polishing wheel, and then the polishing prepressing amounts are generated after the polishing tool is combined with the model.
As an alternative to this, the first and second,
when the blade body has a blade connecting trace, different positions of the blade body profile also comprise a blade body blade connecting position;
when the blade body is provided with the blade tip trimming thinning area, the different positions of the blade body profile further comprise the blade tip trimming area.
Alternatively, the modeling includes,
blade basin dorsad model: breaking a closed curve in a blade theoretical model at a position 0.5-1 mm away from an air inlet and exhaust edge, independently smoothing the curve of a basin back, independently stretching the basin and the basin back into a sheet body through a curve group, and independently controlling UV (ultraviolet) direction curves on a curved surface according to points during stretching to enable the UV curves to be parallel and perpendicular to the edges of two edges of the sheet body;
blade air inlet and outlet edge model: dividing an entity at a position 0.5-1 mm away from the basin back of a blade body in a theoretical model of the blade, extracting four curves at the blade tips of an air inlet edge and an air outlet edge, the blade roots, the basin and the back dividing surface respectively, and constructing the four curves into a new sheet body through grid curves so that UV rays on the curved surface are parallel to and perpendicular to the edges of the two edges;
a flange plate model: extracting curves connected by the flange plate and the blade root switching arcs, copying and offsetting the curves along the surface of the flange plate by one curve exceeding the surface of the flange plate, and stretching the two curves into a sheet body through a curve group;
and (4) transferring the blade root to an arc model, namely amplifying the edge plate and rounding the edge plate and the blade body surface again.
Alternatively, the compressor blade polishing method comprises the steps of,
establishing a blade coordinate system and aligning a cutter bar;
step two, roughly polishing the back of the blade basin and the edge plate;
step three, carrying out secondary rough blade polishing on the back of the basin;
step four, finely throwing the exhaust edge;
step five, finely polishing the back edge plate of the blade basin;
step six, finely polishing the leaf body for the first time in a basin back direction;
step seven, carrying out secondary fine blade polishing on the back of the blade basin.
Further, in the first step, the blade clamp is connected with a C shaft or an A shaft of the numerical control machine tool through the adapter plate, so that the blade tip direction of the compressor blade points to a Z shaft.
Further, the second step further comprises the step of synchronously rough polishing the blade root switching arc of the blade.
Further, in the second step, the back of the basin for roughly throwing the leaves is an up-down bidirectional feed, and the edge plate is a unidirectional feed thrown from outside to inside. The polishing and processing means that the one-way feed of the edge plate from outside to inside is equivalent.
Optionally, when the blade body of the compressor blade has a blade connecting trace, a blade body polishing connecting blade is further included between the first step and the second step, and polishing is performed according to the arc feed speed, the polishing speed and the arc discharge speed.
Optionally, when the blade body of the compressor blade has a tapered edge thinning region, a blade-sharpening edge-polishing region is further included between the fourth step and the fifth step, and a flexible nylon polishing wheel is adopted during polishing.
Further, in the sixth step and the seventh step, the fine polishing is performed in a one-way manner from top to bottom in a feed mode when the first fine polishing blade body basin faces back, and the pre-pressing amount when the first fine polishing blade body basin faces back is smaller than the pre-pressing amount when the second fine polishing blade body basin faces back.
Compared with the prior art, the polishing method of the compressor blade has the following characteristics:
(1) compared with the existing manual polishing, the blade polishing and grinding method changes the process that the blade is manually held on the grinding wheel to be polished and ground into the process that the blade is clamped by the clamp to be automatically polished and ground on the numerical control mechanical equipment.
(2) In the prior art, the abrasive belt grinding and the robot polishing are to clamp parts by using a clamp, a mechanical wheel rotates to drive an abrasive belt to grind and polish on blades, the polishing process of a flange plate and a switching arc still needs manual polishing due to a grinding and polishing process, a tool method and the like, and the invention realizes the automatic polishing of all positions of the molded surface of the blade body of the compressor blade.
(3) The numerical control polishing processing of the basin back, the air inlet and outlet edges, the edge plate and the switching arc of the blade body of the compressor blade can be satisfied by adopting fixed-orbit prepressing numerical control polishing processing, and the advanced process of the compressor blade from manual work to mechanical polishing is solved.
(4) According to the invention, a sectional polishing thought is adopted, different optimization models are established aiming at different positions of the blade for polishing, the position of the blade clamped relative to a machine tool spindle is changed by designing the adapter plate, and the vertical polishing mode is adopted for implementation.
(5) The polishing prepressing amount is fixed, one prepressing amount is obtained in one processing step, but the prepressing amount can be changed for multiple polishing processing to meet the technical requirements of size, roughness and the like.
(6) The invention provides a new idea of fast forward of the great arc → slow at the tool connecting position → fast forward of the great arc aiming at the polishing treatment at the tool connecting position.
Drawings
FIG. 1 is a schematic view of a simulation of a polishing blade joint;
FIG. 2 is a schematic diagram of a simulation of rough blade body, root transition arc and flange plate;
FIG. 3 is a schematic diagram of a simulation during fine polishing of an air discharge edge;
FIG. 4 is a schematic illustration of a simulation of polishing a tip trim thinning area;
FIG. 5 is a schematic diagram of a simulation of a basin with a fine leaf-throwing body facing away from the basin;
FIG. 6 is a schematic structural view of the assembled blade clamp, adapter plate and 3R quick-change tooling base;
FIG. 7 is a schematic view of an adapter plate;
fig. 8 is an exploded assembly view of the blade clamp, adapter plate and 3R quick-change tooling base.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made based on the common technical knowledge and conventional means in the art without departing from the technical idea of the present invention are included in the scope of the present invention.
The numerical control polishing method only aims at polishing processing of aero-engine compressor blades after numerical control allowance-free milling, and the core concept of the numerical control polishing method is as follows:
(1) the clamp is improved: the design keysets is connected anchor clamps and the epaxial 3R quick change frock of lathe C or A, and the numerical control polishing is vertical polishing, and blade apex direction points to the Z axle. Fig. 6 to 8 are diagrams showing a state in which a blade fixture, an adapter plate and a 3R quick-change tooling base are used in combination, wherein fig. 8 sequentially shows, from top to bottom, the blade fixture (for clamping a blade tenon), the adapter plate, a 3R locating piece, a pull nail and a 3R locating chuck, the blade fixture is used for clamping the blade tenon, and the 3R locating chuck is mounted on a machine tool and connected with a C shaft or an a shaft of the machine tool. The structure of the adapter plate is shown in fig. 7, the adapter plate is provided with positioning pin holes and screw holes (four corners in fig. 7 are screw holes, and four positioning pin holes are formed in a rectangle formed by four screw holes), the positioning pin holes and the screw holes are used for connecting a blade clamp and a positioning plate of a 3R quick-change tool, and for connecting the blade clamp and the positioning plate, the size of the positioning pin holes and the size of the screw holes are designed according to the positioning plate of the blade clamp and the positioning plate of the 3R quick-change tool, but because a blade body and a flange plate (rabbet) are not in the same coordinate system and have an included angle, the positioning pin holes and the screw holes on the adapter plate can rotate by the angle when being designed, the purpose of doing so can be that when the blade is clamped on a machine tool, the coordinate system of the blade body and a moving shaft (X shaft) of the machine tool can be kept parallel, thus, the linkage of the rotating shaft of the machine tool can be reduced when the blade is polished, the angle of one rotating shaft can be fixed, and the fixed shaft processing (namely, under the normal condition, the fewer the number of linked shafts, the more stable the machining. When five-axis linkage machining is adopted, the situation that all power transmission shafts stop to wait for the rotation shafts to move can occur, no problem exists during numerical control milling, but local multi-polishing can be caused due to the fact that polishing machining is not performed. However, when the cutter connecting part and the blade basin back are polished, if the optimized model is adopted, because the UV lines of the curved surface sheet body to be machined are parallel and vertical and the area of the machining area is large, when the five-axis linkage of the cutter shaft is controlled, four or more points are selected as interpolation vectors, the five-axis linkage machining can be realized, when the basin and the back have large curvatures, the problems of interference and the like can be solved, and meanwhile, the machining efficiency and the roughness are better).
(2) Numerical control polishing: the working contents of the profile of the blade body of the blade are the blade basin back, the air inlet and outlet edges of the blade, the edge plate and the blade root switching arc, because polishing is a special processing method, and different from numerical control milling, the numerical control milling is rigid cutting, the numerical control polishing is flexible cutting, and a theoretical model cannot be used for directly compiling a processing program, so that a processing model needs to be optimized and adjusted, and a new model is established.
(3) Establishing a model: the processing model is to optimize and adjust the theoretical model of the blade and establish a new model, UG three-dimensional model design software is adopted for optimizing the model, the theoretical model of the blade is physically divided, adjusted and optimized, and the basin back, the air inlet and outlet edges, the edge plate and the blade root switching arc of the blade are divided.
The theoretical model of the blade is established by designing given coordinate data points to form a closed curve and stretching the curve in a curve group mode.
The blade theoretical model is an integral entity, the normal direction on the curved surface of the blade theoretical model is irregular, and the blade theoretical model is directly used for processing the driving surface, so that the phenomenon of no tool path locally or overlapping of local tool paths can occur, and multi-throw and under-throw are caused. Meanwhile, the design requirements cannot be met due to the fact that the blade basin back, the air inlet and outlet edges, the edge plates and other parts have different dimensional tolerances and shapes, the rigidity strength and the stressed area are inconsistent, and the allowance, the roughness and the like of the whole polishing removal are different.
In summary, the invention optimizes, adjusts and polishes the theoretical model of the blade in sections, and divides the theoretical model of the blade according to different positions (the basin back of the blade, the air inlet and outlet edges, the edge plate, the blade root switching arc and the blade tip edge thinning area (also called as a cutting clamp)).
Optimizing and establishing a blade basin back model: breaking an original curve (a curve closed by a theory of principle model) at a distance of 0.5-1 mm from an air inlet and exhaust edge, independently smoothing the curve of the basin back (smoothing point position is 60-80 and smoothing tolerance is 0.01), independently stretching the basin and the basin back into a sheet body through a curve group, and independently controlling UV (ultraviolet) curves on a curved surface according to points during stretching to enable the UV curves to be parallel and perpendicular to two edges of the sheet body.
Optimizing and establishing a blade air inlet and outlet edge model: and (3) extracting four curves at the positions of the blade tips of the air inlet and exhaust edges, the blade roots, the basin and the back division surface respectively (inlet and outlet) from the entity divided at a position 0.5-1 mm away from the basin back of the blade body in the theoretical model of the blade, and constructing the four curves into a new sheet body through grid curves, wherein the method can enable the UV line on the curved surface to be parallel and perpendicular to the edges of the two edges.
Optimizing and establishing a flange plate model: the curve that flange plate and blade root switching circular arc are connected is extracted, with the curve along flange plate face replication skew one exceed the flange face, through curve group with two curves stretch into a lamellar body, the purpose of doing so is in order to guarantee that the polishing route keeps the perpendicular relation with blade root switching circular arc all the time during flange plate polishing processing, can not cause the overcut to it.
Optimizing and establishing a blade root switching arc model: enlarging the edge plate, and rounding the edge plate and the blade surface again.
Optimizing and establishing a model of a tip trimming thinning area: and (3) extracting a curve connecting the blade body of the original thinning area and the blade body, stretching the curve along the normal direction of the blade body to be 1-1.2 mm higher than the basin direction of the blade body, and taking the curve as a driving surface to avoid the phenomenon of over-throwing with the blade body.
The construction method for optimizing the polishing surface of the polishing machine projects the polishing path to the blade theoretical model to perform segmented polishing.
(4) Polishing: the vertical fixed track processing program is derived from an interpolation programming mode, a multi-axis processing strategy is adopted, the pre-pressing amount of a polishing wheel is set through the diameter of a cutter (numerical control milling is rigid processing, numerical control polishing is flexible processing, the actual diameter of the cutter is in zero-to-zero contact with a processed surface during milling (hard contact), during polishing (soft contact), the diameter of the cutter in programming is set to be smaller than the actual diameter of the polishing wheel, the polishing wheel is embedded into the processed surface when in contact with the processed surface, the embedded part is called the pre-pressing amount, the pre-pressing amount of the polishing wheel is controlled through the diameter of the cutter during programming, for example, the actual diameter of the polishing wheel is D20, the cutter during programming is set to be D19.6, the pre-pressing amount (embedded into the processed surface) is 0.2 (embedded in part of radius)), different pre-pressing amounts are set according to the specification and the processed part of the polishing wheel, corresponding processing precision parameters are adjusted, and generating a machining tool path track according to the optimized blade curved surface model, and realizing segmented polishing.
The following detailed process of the track fixing and prepressing numerical control polishing of the molded surface of the blade body of the compressor blade is as follows:
it should be noted that fig. 1 to 5 are all screenshots during the simulation motion, X, Y, Z represents a coordinate axis, XC, YC, and ZC represent coordinate axes under a model coordinate system, which are used during the optimization modeling, and XC, YC, and ZC represent coordinate axes at the lower end of a machining coordinate system, which are used during the polishing machining. The straight lines indicated by the straight arrows in fig. 1 to 5 represent the lines approaching the parts to advance and retreat from the safety distance, and only 1 straight line is shown in fig. 5 due to the shading of the polishing wheel rod. The area indicated by the broken line arrow in fig. 1-5 is a polishing track area, the lines in the area represent a specific polishing track route, and the polishing wheel moves along the lines in the area, which is shown as a surface area because the lines are denser.
(1) Establishing a blade coordinate system and aligning a cutter rod.
A3R quick-change tool base is installed on an A-axis or C-axis workbench of a machine tool, a blade clamp is fixedly clamped on the 3R quick-change tool, the position of the clamp is aligned by a core rod standard part, and the coordinate of a polished machining origin is determined. The tool shank is provided with a polishing wheel tool bar, a pneumatic grinding wheel is used for correcting the polishing wheel tool bar, the polishing wheel tool bar is required to be guaranteed to be consistent in length and consistent in circular run-out during array polishing, the run-out is not more than 0.005mm, and a dial indicator is used for finding a swing length value between a main shaft rotation center and the polishing wheel.
(2) And (4) a blade body connecting knife is thrown (blade with a blade body connecting trace is processed, and the blade without the blade connecting trace can be omitted).
Before rough polishing, polishing the back-to-cutter joint of a blade body basin, removing cutter joint marks after numerical control milling, and in order to ensure that no obvious mark exists in smooth transfer with the blade body, the method for polishing the cutter joint adopts a processing scheme of arc feed fast, polishing slow and arc discharge fast, the feed and discharge are set to be arcs, so that polishing depth marks are prevented from being caused on the blade body, and the pre-pressing amount is 0.3-0.5 mm (as shown in figure 1).
(3) The rough blade throwing basin faces back to the flange plate.
Roughly polishing a basin, a back and a flange plate of a blade, selecting a polishing wheel (100# -500 #) with larger size and lower mesh number for removing the grain of a numerical control milling cutter, wherein the pre-pressing amount is 0.3-0.5 mm, the drum-shaped part and the bottom of the polishing wheel are both elastic working parts covered with abrasive materials, when the basin and the back of the blade are roughly polished, the blade root of the blade can be synchronously and roughly polished to be connected with an arc and a flange plate area, the basin of the body of the roughly polished blade is back to an upper and lower bidirectional feed, the flange plate is polished from outside to inside by a unidirectional feed, and the rough polishing quickly removes the allowance (as shown in figure 2, the body of the roughly polished blade, the roughly polished connected arc and the roughly polished flange plate are sequentially arranged from left to right in figure 2).
(4) The second coarse blade-throwing basin faces back.
And carrying out secondary rough polishing on the leaf basin and the leaf back of the leaf, selecting a polishing wheel with small size and medium mesh number (600# -1500 #), wherein the pre-pressing amount is 0.3-0.5 mm, and in order to remove the grains of the polishing wheel with large size and low mesh number at the last time, the drum-shaped part of the polishing wheel is large in radius, is covered with abrasive materials and is an elastic working part, and only the leaf basin and the leaf back can be roughly polished.
(5) And finely throwing the air into an exhaust edge.
The air inlet and outlet edges are small and thin, the geometric accuracy is poor, and the over-polishing phenomenon is easy to occur, so that the air inlet and outlet edges are not polished during rough polishing, and the process requirements can be met only by performing one-time fine polishing. The pre-pressing amount is controlled between 0.1 mm and 0.2mm during air intake and exhaust fine polishing, and a drum-shaped flat polishing wheel with larger diameter and 2000# mesh is used (as shown in figure 3).
(6) And (4) a blade tip edge area is thrown (the blade with the blade tip edge thinning area on the blade body can be processed, and the blade without the blade tip edge thinning area can be omitted).
The thickness tolerance of the blade tip trimming thinning area after numerical control milling is generally between 0 mm and 0.15mm, the rigidity of the blade tip trimming thinning area is poor, the phenomena of multi-throwing and cutter back-off rebound are easily caused by using an electroplated superhard abrasive material flexible polishing wheel, the processing surface and the size are difficult to control, therefore, a softer flexible nylon polishing wheel is adopted (as shown in figure 4), before the nylon polishing is used, the shape is modified by using a pneumatic grinding wheel, the diameter of the flexible nylon polishing wheel is smaller than the curvature radius of a polishing part, and the pre-pressing amount is controlled to be between 0.3mm and 0.5 mm.
(7) And (4) finely polishing the back edge plate of the blade basin.
The fine polishing mainly removes a corrosion layer and improves the surface roughness of the blade, and a polishing wheel with a larger and finer granularity number is used. The feed mode is consistent with the rough polishing, and the surface roughness is lower than Ra0.4 mu m after the fine polishing.
(8) The first fine leaf-throwing basin faces back.
The first fine polishing mainly removes a corrosion layer or rough polishing lines to improve the surface roughness of the blade, a polishing wheel with a smaller diameter can be selected according to the rigidity and the strength of the blade, a polishing wheel (2000# -6000 #) with a large granularity number is used, the pre-pressing amount is 0.2-0.3 mm, the blade tip is thinner, and fine polishing is performed in a feed mode from top to bottom in a one-way mode to reduce the deformation cutter relieving phenomenon.
(9) The second fine polishing blade basin faces back.
Performing primary fine polishing to remove the corrosion layer; the polishing process parameters are changed by the second fine polishing, the rotating speed of the main shaft is reduced to 40% of that of the first fine polishing, the feeding is improved to 120% of that of the first fine polishing, the pre-pressing amount is changed from 0.2-0.3 mm to 0.3-0.4 mm, the surface roughness after the second fine polishing is lower than Ra0.4 mu m, the geometric precision of the blade is ensured, and the surface after the fine polishing is high in consistency and manufacturing conformity (as shown in figure 5).
Claims (10)
1. A numerical control polishing method for a compressor blade is characterized by comprising the following steps: the polishing device is used for polishing the numerical control non-allowance milled blade, when in polishing, the polishing method of vertical type, subsection fixed track and prepressing is adopted to carry out numerical control polishing on different positions of the blade body molded surface of the compressor blade, the different positions of the blade body molded surface comprise a blade basin back, a flange plate, a blade air inlet and outlet edge and a blade root switching arc, wherein,
the vertical type means that the blade tip direction of the compressor blade points to the Z axis of the numerical control machine;
the segmented orbit determination means that a theoretical model entity of a compressor blade is divided into a plurality of independent parts of a blade basin back, a flange plate, a blade air inlet and outlet edge and a blade root switching arc, a model is built, and a special and fixed feed path and a processing orbit are respectively customized;
during prepressing, different prepressing amounts are set according to the specification, the machining position, the machining size and the roughness design requirement of the polishing wheel, and then the polishing prepressing amounts are generated after the polishing tool is combined with the model.
2. The numerical control polishing method for the compressor blade according to claim 1, characterized by comprising the following steps:
when the blade body has a blade connecting trace, different positions of the blade body profile also comprise a blade body blade connecting position;
when the blade body is provided with the blade tip trimming thinning area, the different positions of the blade body profile further comprise the blade tip trimming area.
3. The numerical control polishing method for the compressor blade according to claim 1, characterized by comprising the following steps: the separately establishing the model may include,
blade basin dorsad model: breaking a closed curve in a blade theoretical model at a position 0.5-1 mm away from an air inlet and exhaust edge, independently smoothing the curve of a basin back, independently stretching the basin and the basin back into a sheet body through a curve group, and independently controlling UV (ultraviolet) direction curves on a curved surface according to points during stretching to enable the UV curves to be parallel and perpendicular to the edges of two edges of the sheet body;
blade air inlet and outlet edge model: dividing an entity at a position 0.5-1 mm away from the basin back of a blade body in a theoretical model of the blade, extracting four curves at the blade tips of an air inlet edge and an air outlet edge, the blade roots, the basin and the back dividing surface respectively, and constructing the four curves into a new sheet body through grid curves so that UV rays on the curved surface are parallel to and perpendicular to the edges of the two edges;
a flange plate model: extracting curves connected by the flange plate and the blade root switching arcs, copying and offsetting the curves along the surface of the flange plate by one curve exceeding the surface of the flange plate, and stretching the two curves into a sheet body through a curve group;
and (4) transferring the blade root to an arc model, namely amplifying the edge plate and rounding the edge plate and the blade body surface again.
4. The numerical control polishing method for the compressor blade according to claim 1, characterized by comprising the following steps: comprises the following steps of (a) carrying out,
establishing a blade coordinate system and aligning a cutter bar;
step two, roughly polishing the back of the blade basin and the edge plate;
step three, carrying out secondary rough blade polishing on the back of the basin;
step four, finely throwing the exhaust edge;
step five, finely polishing the back edge plate of the blade basin;
step six, finely polishing the leaf body for the first time in a basin back direction;
and step seven, carrying out secondary fine blade polishing on the back of the basin.
5. The numerical control polishing method for the compressor blade according to claim 4, characterized in that: in the first step, the blade clamp is connected with a shaft C or a shaft A of the numerical control machine tool through the adapter plate, so that the blade tip direction of the compressor blade points to a shaft Z.
6. The numerical control polishing method for the compressor blade according to claim 4, characterized in that: and the second step also comprises a blade root switching arc of the synchronous rough polishing blade.
7. The numerical control polishing method for the compressor blade according to claim 6, characterized in that: in the second step, the back of the basin for roughly throwing the leaves is an up-down bidirectional feed, and the edge plate is a unidirectional feed thrown from outside to inside.
8. The numerical control polishing method for the compressor blade according to claim 4, characterized in that: when the blade body of the compressor blade has a blade-receiving trace, a blade body-polishing blade-receiving step is also included between the first step and the second step, and the polishing is performed according to the modes of fast arc feed, slow polishing and fast arc discharge.
9. The numerical control polishing method for the compressor blade according to claim 4, characterized in that: when the blade body of the compressor blade has a blade sharp edge thinning area, a blade sharp edge polishing area is further included between the fourth step and the fifth step, and a flexible nylon polishing wheel is adopted during polishing.
10. The numerical control polishing method for the compressor blade according to claim 4, characterized in that: in the sixth step and the seventh step, when the first fine blade body basin faces back, the processing mode is that fine blade polishing is carried out from top to bottom in a one-way mode, and the pre-pressing amount when the first fine blade body basin faces back is smaller than that when the second fine blade body basin faces back.
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| CN115488734A (en) * | 2022-09-29 | 2022-12-20 | 中国航发动力股份有限公司 | Chamfering machining method for edge plate face of compressor rotor blade |
| CN116728233A (en) * | 2023-08-15 | 2023-09-12 | 启东市申力高压油泵厂 | Cambered surface burnishing and polishing equipment |
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| CN115488734A (en) * | 2022-09-29 | 2022-12-20 | 中国航发动力股份有限公司 | Chamfering machining method for edge plate face of compressor rotor blade |
| CN116728233A (en) * | 2023-08-15 | 2023-09-12 | 启东市申力高压油泵厂 | Cambered surface burnishing and polishing equipment |
| CN116728233B (en) * | 2023-08-15 | 2023-10-24 | 启东市申力高压油泵厂 | Cambered surface burnishing and polishing equipment |
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