CN112857280A - Tool of measuring machine for rotor blade of aircraft engine and coordinate system establishing method thereof - Google Patents
Tool of measuring machine for rotor blade of aircraft engine and coordinate system establishing method thereof Download PDFInfo
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- CN112857280A CN112857280A CN202110048401.4A CN202110048401A CN112857280A CN 112857280 A CN112857280 A CN 112857280A CN 202110048401 A CN202110048401 A CN 202110048401A CN 112857280 A CN112857280 A CN 112857280A
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- blade
- positioning
- clamp
- coordinate system
- tenon root
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/045—Correction of measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/047—Accessories, e.g. for positioning, for tool-setting, for measuring probes
Abstract
The invention discloses a tool of a measuring machine for an aircraft engine rotor blade and a coordinate system establishing method thereof. The fixture positioning block positions the blade through the blade tenon root according to a six-point positioning principle. The upper surface of the clamp positioning block is provided with a half dovetail groove structure which can be used for positioning the blade tenon root on one side; the fixture positioning block adopts a hinge structure to position and clamp the other side of the blade tenon root, and partial tenon root wedge-shaped surface is leaked. The fixture can measure the blade profile and the tenon root wedge-shaped surface serving as a reference positioning surface of the blade at the same time. The clamp base is cylindrical, so that a measuring coordinate system of the blade can be conveniently established in the measuring process of the blade. The blade positioning and clamping device can be used for quickly positioning and clamping blades, has the characteristics of simple structure, convenience in installation and accuracy in positioning, improves the blade measuring efficiency, and has important significance for realizing the mass and high-efficiency production of the blades.
Description
Technical Field
The invention relates to a tool of a measuring machine for an aero-engine rotor blade and a coordinate system establishing method thereof, in particular to a precision positioning fixture for measuring a three-coordinate measuring machine for an aero-engine rotor blade and a measuring coordinate system establishing and correcting method thereof, and belongs to the technical field of aero-engine blade measurement.
Background
The blade is a key part of the aero-engine, plays an important role in the engine, and the machining quality of the blade seriously affects the overall performance of the aero-engine. In order to meet the performance requirements of the aircraft engine, the blade profile is mostly a complex free-form surface, belongs to a thin-wall structure and presents a large-angle bending-twisting characteristic. In order to ensure the quality of the blade, measurements need to be taken at different stages of blade manufacture.
The three-coordinate measuring machine is widely applied to blade measurement by virtue of the advantages of strong universality, high detection precision and the like, and is an important means for ensuring the size precision of the blade at present. When the blade is measured in three coordinates, a corresponding measuring coordinate system is established according to the reference surface. Because the size of the tenon root part of the blade is small, the establishment of a measuring coordinate system is difficult, and a series of problems of poor blade measuring precision, low measuring efficiency and the like are caused. Therefore, when the blade is measured in three-coordinate mode, an auxiliary clamp needs to be designed to fix the blade on the working table and keep the blade at the correct position, so that the blade measuring accuracy is guaranteed and the blade measuring efficiency is improved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing aeroengine blade batch measurement has the problems of low efficiency and difficult establishment of a measurement coordinate system.
In order to solve the above problems, the technical solution of the present invention is to provide a positioning fixture for three-coordinate measurement of an engine rotor blade, which is characterized in that: the blade stacking device comprises a clamp base, a clamp positioning block, a hinge structure, a positioning piece and a jacking piece, wherein the clamp positioning block is arranged on the clamp base, the axis of the clamp base is overlapped with a blade stacking shaft, and the surface of the clamp base, which is in contact with the clamp positioning block, is parallel to the upper surface of the clamp positioning block;
the upper surface of the clamp positioning block is provided with at least two convex blocks, the convex blocks are provided with half dovetail groove structures matched with the wedge surfaces on the single sides of the blade tenon roots, and the wedge surfaces of the half dovetail groove structures are matched with the wedge surfaces of the blade tenon roots;
the hinge structure comprises a jacking pressing block and a driving structure for driving the jacking pressing block to jack the wedge-shaped surface on the other side of the blade tenon root, a clamping structure for clamping the hinge structure is arranged on the upper surface of the clamp positioning block, the driving structure penetrates through the clamping structure and is movably connected with one end of the jacking pressing block, so that the jacking pressing block can move in the vertical direction while moving in the horizontal direction, and the other end of the jacking pressing block is provided with a half dovetail groove structure matched with the wedge-shaped surface on the other side of the blade tenon root; the driving structure pushes the jacking pressing block to generate displacement towards the blade tenon root direction, so that the half dovetail groove structure of the jacking pressing block is attached to the wedge-shaped surface on the other side of the blade tenon root;
the positioning piece and the jacking piece are arranged on the fixture positioning block and are respectively used for positioning and clamping two side surfaces of the blade tenon root; after the blade is measured, clamped and positioned, part of the tenon root wedge-shaped surface is exposed, and the blade profile and the tenon root wedge-shaped surface serving as a blade reference positioning surface are measured simultaneously.
Preferably, the drive structure includes the tight threaded rod in top, pushes up tight thread bush and knob handle, it is articulated with the tight briquetting in top to push up tight threaded rod one end, and the other end is connected with the tight thread bush in top, the tight thread bush in top is equipped with the boss structure with the one end that the tight threaded rod in top is connected, and the other end passes the clamping structure and is connected with knob handle, and knob handle rotation makes the tight threaded rod in top drive the tight briquetting in top and takes place the displacement, and then presss from both sides tightly or loosen the blade tenon root.
Preferably, the tight threaded rod in top one end is the thread end, and the other end is equipped with the connecting block, thread end and the tight thread bush connection cooperation in top, the groove clearance fit on connecting block and the tight briquetting in top, connecting block and the articulated connection of recess make the tight briquetting in top can be along vertical direction activity.
Preferably, the clamp base is cylindrical, and the upper surface of the clamp base is provided with a positioning hole and a connecting hole for positioning and connecting the clamp positioning block.
Preferably, the knob handle and the threaded sleeve are fixedly connected through a pin.
Preferably, the clamping structure is a through hole, and the tightening thread sleeve penetrates through the through hole to be fixedly connected with the knob handle.
Preferably, the positioning piece is a positioning pin, and the positioning pin is arranged on the clamp positioning block and used for positioning one side surface of the blade tenon root.
Preferably, the top tightening piece is a top tightening screw which penetrates through the lug to clamp the other side face of the blade tenon root.
The invention also provides a measuring coordinate system establishing method of the positioning fixture for measuring the three-coordinate measuring machine of the engine rotor blade, which is characterized by comprising the following steps:
defining the upper surface of the clamp base to be represented as an A surface, the side surface of the clamp positioning block to be represented as a B surface, the wedge surface of the clamp positioning block to be represented as a C surface, the contact surface of the clamp positioning block and the blade tenon root to be represented as a D surface, and the side surface of the cylindrical surface of the clamp base to be represented as an E surface; the method utilizes A, B, E three surfaces to establish a measurement coordinate system, and comprises the following specific processes:
firstly, scanning the overall dimension of a clamp positioning block through a measuring machine to obtain the distance between the surface D of the clamp positioning block and the surface A of the upper surface of a clamp base;
secondly, establishing an initial coordinate system O 'X' Y 'Z':
step 2.1, establishing a Y ' O ' X ' coordinate plane: the measuring machine randomly takes three points which are not on the same straight line on the surface A of the upper surface of the clamp base, and determines the surface A as a coordinate plane Y ' O ' X ' according to the principle that three points establish a coordinate plane;
step 2.2, determining an X' axis: straightening a side surface B of a positioning block of the clamp, arbitrarily taking two points on the side surface B, connecting the two points by using a connecting line as large as possible, projecting the connecting line of the two points to a coordinate plane Y 'O' X ', and taking the obtained orthographic projection as an X' axis;
step 2.3, determining the origin of coordinates O': measuring a circle on the surface E of the cylindrical surface of the clamp base, determining the circle center, projecting the circle center to an X 'axis along the normal vector direction of the surface A of the upper surface of the clamp base, and taking the obtained projection point as a coordinate origin O';
step 2.4, determining the Y' axis: determining a Y ' axis according to the normal vector direction of the coordinate plane Y ' O ' X ' and the position of the coordinate origin O ';
step 2.5, determining a Z ' axis of a Cartesian coordinate system according to a right-hand rule, namely determining an initial coordinate system O ' X ' Y ' Z ';
thirdly, establishing a measurement coordinate system OXYZ: and according to the distance between the surface D of the clamp positioning block and the surface A of the upper surface of the clamp base obtained in the first step, moving the initial coordinate system O ' X ' Y ' Z ' along the Z ' direction by the distance to determine a measurement coordinate system OXYZ.
The invention also provides a correction method of a measuring coordinate system of the positioning fixture for three-coordinate measurement of the engine rotor blade, which is characterized by comprising the following steps:
step 1, determining an accurate coordinate system of the blade by using positioning surfaces of the blade, namely a blade tenon root wedge surface and a blade tenon root side surface, and establishing an actual position coordinate system of the blade by measuring an exposed blade tenon root wedge surface and the exposed blade tenon root positioning side surface;
and 3, correcting the measurement coordinate system according to the error value obtained in the step 2.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by positioning the wedge-shaped surface on the single side of the blade tenon root, the side surface of the tenon root and the bottom surface of the tenon root, after the blade is measured, clamped and positioned, part of the wedge-shaped surface of the tenon root leaks out, and the profile of the blade and the wedge-shaped surface of the tenon root serving as a reference positioning surface of the blade can be measured simultaneously. The clamp adopts a hinge structure, and clamps the wedge-shaped surface of the blade while clamping in the horizontal direction. The invention can correct the coordinate system establishment error caused by the clamp manufacturing error, thereby obtaining an accurate measurement coordinate system.
The blade positioning and clamping device can realize rapid positioning and clamping of the blades, has the characteristics of simple structure, convenience in installation and accurate positioning, improves the blade measuring efficiency, and has important significance for realizing the mass and high-efficiency production of the blades.
Drawings
FIG. 1 is a schematic view of an overall structure of a positioning fixture for three-coordinate measurement of an engine rotor blade according to the present invention;
FIG. 2 is a schematic view of a base of the fixture;
FIG. 3 is a schematic view of the fixture positioning block structure;
fig. 4 is a schematic view of a hinge structure.
In the figure:
1-a clamp base; 2-a clamp positioning block; 3-knob handle; 4-tightly pushing the threaded sleeve; 5-positioning pins; 6-a pin; 7-tightening the threaded rod; 8-pressing tightly the pressing block; 9-pins; 10-tightening the screw; 11-first base fastening bolt; 12-second foundation fastening bolts; 13-third foundation fastening bolts; 14-fourth foundation fastening bolt; 15-a first base locating pin; 16-a second base locating pin; 21-a bump; 22-connecting block; 23-a groove; 24-through holes.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
According to the six-point positioning principle, the fixture positioning block 2 positions the blade through the blade tenon root. The upper surface of the clamp positioning block 2 is provided with a half dovetail groove structure which can perform unilateral positioning on the blade tenon root; the fixture positioning block 2 adopts a hinge structure to position and clamp the other side of the blade tenon root, and partial tenon root wedge-shaped surface is leaked. The fixture can measure the blade profile and the blade tenon root wedge-shaped surface simultaneously. The fixture base 1 is cylindrical, so that a measuring coordinate system of the blade can be conveniently established in the measuring process of the blade.
Referring to fig. 1 to 4, the present embodiment is a rapid positioning fixture for measuring an aircraft engine blade, and the rapid positioning fixture is composed of a fixture base 1, a fixture positioning block 2, a knob handle 3, a tightening thread bushing 4, a positioning pin 5, a pin 6, a tightening threaded rod 7, a tightening press block 8, a pin 9, a tightening screw 10, a first base fastening bolt 11, a second base fastening bolt 12, a third base fastening bolt 13, a fourth base fastening bolt 14, a first base positioning pin 15, and a second base positioning pin 16. The fixture base 1 is distributed with four fastening bolt mounting holes and two pin 9 positioning holes, and is respectively provided with a first base fastening bolt 11, a second base fastening bolt 12, a third base fastening bolt 13, a fourth base fastening bolt 14, a first base positioning pin 15 and a second base positioning pin 16 for connecting with the fixture positioning block 2. The clamp base 1 has the requirement of accurate position, the clamp base 1 is cylindrical, the axis of the clamp base 1 is overlapped with the blade stacking shaft, and the surface of the clamp base 1, which is contacted with the clamp positioning block 2, is parallel to the upper surface of the clamp positioning block.
Two convex blocks 21 are processed on the upper surface of the clamp positioning block 2, a half dovetail groove structure matched with the wedge surface on the single side of the blade tenon root is processed on the convex blocks 21, the dovetail groove wedge surface is completely matched with the wedge surface of the blade tenon root, and threaded holes are distributed on the dovetail groove structure and are used for being matched with the jacking screws 10. The wedge-shaped surface C of the clamp positioning block 2 has the requirement of accurate position, the surface roughness Ra of the wedge-shaped surface C reaches 0.8 mu m, and the blade tenon root is prevented from being scratched in the blade measuring process.
The other side of the upper surface of the clamp positioning block 2 is provided with a through hole 24 which is used for connecting with the tightening thread sleeve 4 of the hinge structure. The clamp positioning block 2 is also provided with a pin hole which is used for matching with the positioning pin 5. Four fastening bolt mounting holes and two pin locating holes are distributed on the bottom surface of the clamp locating block 2, and the pin locating holes have accurate position requirements and are used for being connected with the clamp base 1.
The hinge structure comprises a jacking pressing block 8, a pin 9, a jacking threaded rod 7, a jacking threaded sleeve 4, a pin 6 and a knob handle 3. The jacking pressing block 8 is provided with a half dovetail groove structure and is in clearance fit with the jacking threaded rod 7 through a pin 9. The tight threaded rod 7 one end in top is the screw thread end, and other end processing connecting block 22, screw thread end and the tight thread bush 4 cooperation of top, connecting block 22 and the tight briquetting 8 in top on the recess 23 clearance fit, connecting block 22 and recess 23 are articulated through pin 9 for the tight briquetting 8 in top can be along vertical direction activity. One end of the tightening thread sleeve 4 is provided with a boss structure, and the other end of the tightening thread sleeve passes through the through hole 24 and is connected with the knob handle 3 through the pin 6. The surface roughness Ra of the pressing surface of the jacking pressing block 8 reaches 0.8 mu m, and the blade tenon root is prevented from being scratched in the blade measuring process.
In this embodiment, the blade needs to be positioned and clamped prior to measurement.
When the blade is positioned and clamped, the clamp positioning block 2 is connected with the clamp base 1 through a first base fastening bolt 11, a second base fastening bolt 12, a third base fastening bolt 13, a fourth base fastening bolt 14, a first base positioning pin 15 and a second base positioning pin 16. The hinge structure jacking pressing block 8 is connected with the jacking threaded rod 7 through a pin 9, then the jacking threaded rod 7 is in threaded connection with the jacking threaded sleeve 4 and penetrates through a hinge structure connecting through hole 24 of the clamp positioning block 2, and the jacking threaded sleeve 4 exposed outside the clamp positioning block 2 is connected with the knob handle 3 through a pin 6. Inserting the positioning pin 5 into the corresponding pin hole of the fixture positioning block 2, then placing the blade into the fixture positioning block 2, attaching the wedge surface of the half dovetail groove structure of the fixture positioning block 2 to the single-side wedge surface of the blade tenon root, and positioning and clamping the blade tenon root flow passage direction through the jacking screw 10. And finally, the knob handle 3 is screwed down, so that the tightening threaded rod 7 drives the tightening pressing block 8 to displace, and the half dovetail groove structure of the tightening pressing block 8 is attached to the wedge-shaped surface on the other side of the blade tenon root and the side surface of the blade tenon root, so that the blade runner is positioned and clamped in the vertical direction and the vertical direction of the blade.
The embodiment provides a measuring coordinate system establishing method of a measuring clamp of a three-coordinate measuring machine for rotor blades of an aircraft engine. The upper surface of the fixture base is represented as surface a, the side surface of the fixture positioning block is represented as surface B, the wedge surface of the fixture positioning block is represented as surface C, the contact surface of the fixture positioning block and the blade tenon root is represented as surface D, and the cylindrical surface of the fixture base is represented as surface E. The method comprises the following steps of establishing a measuring coordinate system by utilizing A, B, E three surfaces, wherein the establishing of the measuring coordinate system adopts a 3-2-1 method, and the specific process comprises the following steps:
firstly, scanning the overall dimension of the clamp positioning block through a measuring machine to obtain the distance between the surface D of the clamp positioning block and the surface A of the upper surface of the clamp base.
Second, an initial coordinate system O 'X' Y 'Z' is established.
Step 2.1, establishing a Y ' O ' X ' coordinate plane: the measuring machine randomly takes 3 points which are not on the same straight line on the surface A of the upper surface of the clamp base, and the distance between the three points is required to be as large as possible. Determining the A surface as a coordinate plane Y ' O ' X ' according to the principle of establishing a coordinate plane by three points;
step 2.2, determining an X' axis: straightening a side surface B of a positioning block of the clamp, arbitrarily taking two points on the side surface B, connecting the two points by using a connecting line as large as possible, projecting the connecting line of the two points to a coordinate plane Y 'O' X ', and taking the obtained orthographic projection as an X' axis;
step 2.3, determining the origin of coordinates O': measuring a circle on the surface E of the cylindrical surface of the clamp base, determining the center of the circle, projecting the center of the circle to an X 'axis along the normal vector direction of the surface A, and taking the obtained projection point as a coordinate origin O';
step 2.4, determining the Y' axis: determining a Y ' axis according to the normal vector direction of the coordinate plane Y ' O ' X ' and the position of the coordinate origin O ';
step 2.5, determining a Z ' axis of a Cartesian coordinate system according to a right-hand rule, namely determining an initial coordinate system O ' X ' Y ' Z ';
and thirdly, establishing a measurement coordinate system OXYZ. And according to the distance between the surface D of the clamp positioning block and the surface A of the upper surface of the clamp base obtained in the first step, moving the initial coordinate system O ' X ' Y ' Z ' along the Z ' direction by the distance to determine a measurement coordinate system OXYZ, and finishing the establishment of the measurement coordinate system.
The invention also provides a measuring coordinate system correction method of the measuring clamp of the three-coordinate measuring machine for the rotor blade of the aircraft engine, which comprises the following steps: because the blade measuring clamp has manufacturing errors, the actual position and the theoretical position of the blade during measurement have deviation, and therefore, a measuring coordinate system needs to be corrected when the measuring clamp is used for the first time. The specific method comprises the following steps:
and step 1, determining an accurate coordinate system of the blade by the positioning surface of the blade, namely the blade tenon root wedge surface and the blade side surface. When the blade is positioned, the measuring clamp disclosed by the invention has the advantage that parts of the two sides of the wedge-shaped surface of the blade tenon root are leaked out. Establishing a blade actual position coordinate system by measuring the leaked blade tenon root wedge profile and the tenon root positioning side;
and 3, correcting the measurement coordinate system according to the error value obtained in the step 2. The measuring coordinate system is corrected when the fixture is used subsequently.
After the measurement is finished, the knob handle 3 is firstly unscrewed, and then the jacking screw 10 is unscrewed, so that the blade can be taken out. And measuring again and repeating the clamping step.
Claims (10)
1. A positioning fixture for three-coordinate measurement of an engine rotor blade is characterized in that: the blade stacking device comprises a clamp base (1), a clamp positioning block (2), a hinge structure, a positioning piece and a jacking piece, wherein the clamp positioning block (2) is arranged on the clamp base (1), the axis of the clamp base (1) is overlapped with a blade stacking shaft, and the surface of the clamp base (1) in contact with the clamp positioning block (2) is parallel to the upper surface of the clamp positioning block;
at least two bumps (21) are arranged on the upper surface of the clamp positioning block (2), a half-dovetail groove structure matched with the wedge surface on the single side of the blade tenon root is arranged on the bumps (21), and the wedge surface of the half-dovetail groove structure is matched with the wedge surface of the blade tenon root;
the hinge structure comprises a jacking pressing block (8) and a driving structure used for driving the jacking pressing block (8) to jack the wedge-shaped surface on the other side of the blade tenon root, a clamping structure used for clamping the hinge structure is arranged on the upper surface of the clamp positioning block (2), the driving structure penetrates through the clamping structure and is movably connected with one end of the jacking pressing block (8), so that the jacking pressing block (8) can move in the vertical direction while moving in the horizontal direction, and the other end of the jacking pressing block (8) is provided with a half dovetail groove structure matched with the wedge-shaped surface on the other side of the blade tenon root; the driving structure pushes the jacking pressing block (8) to displace towards the blade tenon root direction, so that the half dovetail groove structure of the jacking pressing block (8) is attached to the wedge-shaped surface on the other side of the blade tenon root;
the positioning piece and the jacking piece are arranged on the fixture positioning block and are respectively used for positioning and clamping two side surfaces of the blade tenon root; after the blade is measured, clamped and positioned, part of the tenon root wedge-shaped surface is exposed, and the blade profile and the tenon root wedge-shaped surface serving as a blade reference positioning surface are measured simultaneously.
2. A positioning fixture for three-coordinate measurement of an engine rotor blade as defined in claim 1, wherein: the driving structure comprises a jacking threaded rod (7), a jacking threaded sleeve (4) and a knob handle (3), one end of the jacking threaded rod (7) is hinged to a jacking pressing block (8), the other end of the jacking threaded sleeve is connected with the jacking threaded sleeve (4), a boss structure is arranged at one end of the jacking threaded sleeve (4) connected with the jacking threaded rod (7), the other end of the jacking threaded sleeve penetrates through a clamping structure to be connected with the knob handle (3), and the knob handle (3) rotates to enable the jacking threaded rod (7) to drive the jacking pressing block (8) to displace, so that the blade tenon root is clamped or loosened.
3. A positioning fixture for three-coordinate measurement of an engine rotor blade as defined in claim 2, wherein: the tight threaded rod in top (7) one end is the screw thread end, and the other end is equipped with connecting block (22), and the screw thread end is connected the cooperation with the tight thread bush in top (4), recess (23) clearance fit on connecting block (22) and the tight briquetting in top (8), and connecting block (22) and recess (23) are articulated to be connected and make the tight briquetting in top (8) can be along vertical direction activity.
4. A positioning fixture for three-coordinate measurement of an engine rotor blade as defined in claim 1, wherein: the fixture base (1) is cylindrical, and the upper surface of the fixture base (1) is provided with a positioning hole and a connecting hole which are used for positioning and connecting the fixture positioning block (2).
5. A positioning fixture for three-coordinate measurement of an engine rotor blade as defined in claim 2, wherein: the knob handle (3) and the threaded sleeve are fixedly connected through a pin (6).
6. A positioning fixture for three-coordinate measurement of an engine rotor blade as defined in claim 1, wherein: the clamping structure is a through hole (24), and the tightly-jacking threaded sleeve (4) penetrates through the through hole (24) to be fixedly connected with the knob handle (3).
7. A positioning fixture for three-coordinate measurement of an engine rotor blade as defined in claim 1, wherein: the locating piece is a locating pin (5), and the locating pin (5) is arranged on the clamp locating block (2) and used for locating one side face of the blade tenon root.
8. A positioning fixture for three-coordinate measurement of an engine rotor blade as defined in claim 1, wherein: the top tightening piece is a top tightening screw (10), and the top tightening screw (10) penetrates through the convex block (21) to clamp the other side face of the blade tenon root.
9. A method of establishing a measurement coordinate system of a positioning fixture for three-coordinate measurement of a rotor blade of an engine according to claim 1, wherein:
defining the upper surface of the clamp base to be represented as an A surface, the side surface of the clamp positioning block to be represented as a B surface, the wedge surface of the clamp positioning block to be represented as a C surface, the contact surface of the clamp positioning block and the blade tenon root to be represented as a D surface, and the side surface of the cylindrical surface of the clamp base to be represented as an E surface; the method utilizes A, B, E three surfaces to establish a measurement coordinate system, and comprises the following specific processes:
firstly, scanning the overall dimension of a clamp positioning block through a measuring machine to obtain the distance between the surface D of the clamp positioning block and the surface A of the upper surface of a clamp base;
secondly, establishing an initial coordinate system O 'X' Y 'Z':
step 2.1, establishing a Y ' O ' X ' coordinate plane: the measuring machine randomly takes three points which are not on the same straight line on the surface A of the upper surface of the clamp base, and determines the surface A as a coordinate plane Y ' O ' X ' according to the principle that three points establish a coordinate plane;
step 2.2, determining an X' axis: straightening a side surface B of a positioning block of the clamp, arbitrarily taking two points on the side surface B, connecting the two points by using a connecting line as large as possible, projecting the connecting line of the two points to a coordinate plane Y 'O' X ', and taking the obtained orthographic projection as an X' axis;
step 2.3, determining the origin of coordinates O': measuring a circle on the surface E of the cylindrical surface of the clamp base, determining the circle center, projecting the circle center to an X 'axis along the normal vector direction of the surface A of the upper surface of the clamp base, and taking the obtained projection point as a coordinate origin O';
step 2.4, determining the Y' axis: determining a Y ' axis according to the normal vector direction of the coordinate plane Y ' O ' X ' and the position of the coordinate origin O ';
step 2.5, determining a Z ' axis of a Cartesian coordinate system according to a right-hand rule, namely determining an initial coordinate system O ' X ' Y ' Z ';
thirdly, establishing a measurement coordinate system OXYZ: and according to the distance between the surface D of the clamp positioning block and the surface A of the upper surface of the clamp base obtained in the first step, moving the initial coordinate system O ' X ' Y ' Z ' along the Z ' direction by the distance to determine a measurement coordinate system OXYZ.
10. A method of correcting the measurement coordinate system of a positioning fixture for three-coordinate measurement of an engine rotor blade according to claim 9, wherein:
step 1, determining an accurate coordinate system of the blade by using positioning surfaces of the blade, namely a blade tenon root wedge surface and a blade tenon root side surface, and establishing an actual position coordinate system of the blade by measuring an exposed blade tenon root wedge surface and the exposed blade tenon root positioning side surface;
step 2, establishing a measurement coordinate system through a measuring tool, and calculating an error value of the actual position coordinate system of the blade and the measurement coordinate system in the direction X, Y, Z;
and 3, correcting the measurement coordinate system according to the error value obtained in the step 2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110048401.4A CN112857280B (en) | 2021-01-14 | 2021-01-14 | Tool of measuring machine for rotor blade of aircraft engine and coordinate system establishing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110048401.4A CN112857280B (en) | 2021-01-14 | 2021-01-14 | Tool of measuring machine for rotor blade of aircraft engine and coordinate system establishing method thereof |
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| CN112857280A true CN112857280A (en) | 2021-05-28 |
| CN112857280B CN112857280B (en) | 2021-10-08 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113427421A (en) * | 2021-07-08 | 2021-09-24 | 中国航发湖南动力机械研究所 | Turbine guide vane frock clamp |
| CN113664568A (en) * | 2021-09-29 | 2021-11-19 | 中国航发动力股份有限公司 | Measurement tool and coordinate system establishing method |
| CN114029754A (en) * | 2021-11-17 | 2022-02-11 | 中国航发贵州黎阳航空动力有限公司 | Clamp and method for machining small-size blade tenon rounding |
| CN114166160A (en) * | 2021-11-03 | 2022-03-11 | 安徽应流航源动力科技有限公司 | Method for detecting multiple blades by using single tool based on three-coordinate measuring machine |
| CN114473866A (en) * | 2022-02-25 | 2022-05-13 | 武汉数字化设计与制造创新中心有限公司 | Automatic clamp and method for grinding and polishing blade robot |
| CN114670134A (en) * | 2022-04-18 | 2022-06-28 | 中国航发沈阳发动机研究所 | Aeroengine turbine guide blade sampling clamp |
| CN115026347A (en) * | 2022-06-23 | 2022-09-09 | 中国航发贵州黎阳航空动力有限公司 | Machining method of slender blade tenon tooth and clamp for broaching slender blade tenon tooth |
| CN115122058A (en) * | 2022-07-28 | 2022-09-30 | 中国科学院金属研究所 | Method for machining blade by using five-axis numerical control machining center |
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| CN113427421A (en) * | 2021-07-08 | 2021-09-24 | 中国航发湖南动力机械研究所 | Turbine guide vane frock clamp |
| CN113664568A (en) * | 2021-09-29 | 2021-11-19 | 中国航发动力股份有限公司 | Measurement tool and coordinate system establishing method |
| CN113664568B (en) * | 2021-09-29 | 2022-07-19 | 中国航发动力股份有限公司 | Measurement tool and coordinate system establishing method |
| CN114166160A (en) * | 2021-11-03 | 2022-03-11 | 安徽应流航源动力科技有限公司 | Method for detecting multiple blades by using single tool based on three-coordinate measuring machine |
| CN114029754A (en) * | 2021-11-17 | 2022-02-11 | 中国航发贵州黎阳航空动力有限公司 | Clamp and method for machining small-size blade tenon rounding |
| CN114473866A (en) * | 2022-02-25 | 2022-05-13 | 武汉数字化设计与制造创新中心有限公司 | Automatic clamp and method for grinding and polishing blade robot |
| CN114473866B (en) * | 2022-02-25 | 2023-05-12 | 武汉数字化设计与制造创新中心有限公司 | Automatic clamp and method for grinding and polishing of blade robot |
| CN114670134A (en) * | 2022-04-18 | 2022-06-28 | 中国航发沈阳发动机研究所 | Aeroengine turbine guide blade sampling clamp |
| CN114670134B (en) * | 2022-04-18 | 2023-06-02 | 中国航发沈阳发动机研究所 | Aeroengine turbine guide vane sampling clamp |
| CN115026347A (en) * | 2022-06-23 | 2022-09-09 | 中国航发贵州黎阳航空动力有限公司 | Machining method of slender blade tenon tooth and clamp for broaching slender blade tenon tooth |
| CN115026347B (en) * | 2022-06-23 | 2024-03-29 | 中国航发贵州黎阳航空动力有限公司 | Processing method of slender tenon tooth of blade and clamp for broaching slender tenon tooth |
| CN115122058A (en) * | 2022-07-28 | 2022-09-30 | 中国科学院金属研究所 | Method for machining blade by using five-axis numerical control machining center |
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