Positioning device and method for single set of triple turbine guider vane blades

Abstract

The application discloses a positioning device and method for single-group triple turbine guider blades, and solves the problem of difficult numerical control machining clamping and positioning in the repair process of triple turbine guider blades. The device comprises a base, a pressing plate and a locking unit. The base is a cuboid structure, and the upper surface of the base is provided with a first groove extending along the left-right direction. The first groove is provided with a first circular arc positioning surface, a second circular arc positioning surface, a first end surface positioning surface and a second end surface positioning surface. The first circular arc positioning surface is the rear sidewall of the first groove, the second circular arc positioning surface is the front sidewall of the first groove, the first end surface positioning surface is the bottom surface of the first groove, and the second end surface positioning surface is a surface horizontally extending from the top of the second circular arc positioning surface to the front side. The application can realize stable clamping and automatic positioning of the parts.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of numerical control machining of turbine blades of an aero-engine, and particularly relates to a positioning device and method for single-group triple turbine guide vane blades. BACKGROUND

[0002] When a turbofan engine is returned to the factory for repair after service, the entire engine needs to be disassembled, and all parts thereof need to be comprehensively inspected according to the overhaul manual to determine whether the engine can be reassembled for continued service. When there is a certain defect in the gas collecting box welded to the inner and outer ring surfaces of the triple turbine guide vane, the welded gas collecting box needs to be removed, and the original welding site needs to be cleaned until the base size is exposed, and the size of the site to be welded needs to be ensured to meet the requirements of the overhaul manual.

[0003] The traditional repair method uses manual polishing to remove the welded gas collecting box until the metal base of the site to be welded is exposed. This method not only has high labor cost and low processing efficiency, but also has poor consistency of the size of the site to be welded after processing, and is prone to exceed the tolerance. In addition, the safety of manual operation is also low.

[0004] Due to the complex structure of the triple turbine guide vane, the space arc surface of the gas collecting box part after service, and the limitation of the structure itself, the following process difficulties exist:

[0005] (1) Deformed state of the part after service is different: the damage states of the triple turbine guide vanes of the same engine are different, and the size deformation conditions are also different. Single-group repair is needed during repair, which increases the complexity of positioning and processing.

[0006] (2) No integral circular and angular reference elements: the triple turbine guide vane is deformed after service, the opening is expanded outward, and the non-original regular R circular arc exists; the inner and outer diameters of the triple turbine guide vane have no integral circle, and the circular arc is deformed, which makes it impossible to effectively find the center. At the same time, the lack of angular reference elements makes it impossible to accurately determine the coordinate system origin and angular position of the part to be processed during numerical control machining, thereby affecting the precision and efficiency of processing.

[0007] (3) Structural irregularity and clamping difficulty: due to the poor rigidity of the part as a whole and the irregular structure, there is a height difference between the end faces of the inner and outer rings. The traditional clamp is difficult to stably clamp and effectively control the clamping deformation. It is difficult to ensure the size precision after processing, which increases the uncertainty and risk in the processing process.

[0008] (4) The material of the gas collecting box is thin-walled high-temperature alloy. If the positioning is not accurate enough, the tool is prone to be damaged during processing. SUMMARY

[0009] The technical problem solved by the present application is that the existing triple turbine guide vane blade repair process has the problems of difficult numerical control machining clamping and positioning.

[0010] In order to solve the above problems, the present application further provides a positioning device for a single set of triple turbine guide vane blades, comprising a base, a pressing plate and a locking unit; the base is a cuboid structure, and a first groove is formed on the upper surface of the base and extends in the left-right direction; the first groove has a first circular arc positioning surface, a second circular arc positioning surface, a first end surface positioning surface and a second end surface positioning surface, the first circular arc positioning surface is the rear side wall of the first groove, the second circular arc positioning surface is the front side wall of the first groove, the first end surface positioning surface is the bottom surface of the first groove, and the second end surface positioning surface is a surface extending horizontally from the top of the second circular arc positioning surface to the front side.

[0011] Further, the height difference between the first end surface positioning surface and the second end surface positioning surface of the base is H±0.02mm, wherein H is the design value of the height difference between the end surface of the inner circumference and the end surface of the outer circumference of the blade.

[0012] Further, the first circular arc positioning surface is divided into three sections, namely a left section, a middle section and a right section.

[0013] Further, the radius of the middle section is equal to the radius of the outer circular arc surface of the blade, and the radius of each of the left section and the right section is greater than the radius of the outer circular arc surface of the blade.

[0014] Further, the radius of each of the left section and the right section is greater than the radius of the outer circular arc surface of the blade by 1-2mm.

[0015] Further, the middle section is symmetrically arranged with the center line of the positioning slot as the axis of symmetry.

[0016] Further, the central angle of the middle section is within the range of 6°.

[0017] Further, the pressing plate is an arc-shaped plate with a T-shaped cross section.

[0018] Further, a positioning slot is further arranged on the upper surface of the base and extends from the middle of the second circular arc positioning surface to the front side.

[0019] Further, the pressing plate comprises an outer circular arc positioning surface, an inner circular arc positioning surface, an outer ring end surface and an inner ring end surface.

[0020] In another aspect, the present application also provides a positioning method of single set of triple turbine guide vane blades, which uses the positioning device of single set of triple turbine guide vane blades as described above to position the single set of triple turbine guide vane blades.

[0021] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0022] 1) By the cooperation of the base, the pressing plate and the locking unit, the single set of triple turbine guide vane blades can be clamped, measured and machined;

[0023] 2) By dividing the first circular arc positioning surface into three segments, the deformation interference of the part can be overcome, and accurate positioning can be achieved;

[0024] 3) By setting the reference hole, the machining reference of the vane can be mapped, and the worker can be easily aligned;

[0025] 4) The positioning device of the present application can realize stable clamping of the vane during the entire machining process, and there is no clamping deformation, so as to ensure the consistency of the size of the part in the machining process and in the free state.

[0026] Through the device, stable clamping and automatic positioning of the part can be realized; at the same time, the part machining reference is converted to the related elements of the device, and the tool / grinding wheel can accurately reach the coordinate position of the surface to be machined, so as to simplify the numerical control machining process. The device breaks the conventional group machining mode of triple turbine guide vane blades, realizes rapid positioning, efficient and quick machining of single set of triple turbine guide vane blades, and the machining is more flexible, and the range of applicable numerical control machine tools is wider.

[0027] In the present application, each of the above technical solutions can be combined with each other to realize more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification, or will be understood by implementing the present application. The purpose and other advantages of the present application can be realized and obtained from the contents specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings are included to provide a further understanding of the application and are incorporated herein and constitute a part of the application. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1 Structure schematic view for placing single set of triple turbine guide vane blades on the automatic positioning and reference conversion device of the present application;

[0030] Figure 2 is Figure 1 Top view (without the pressing plate);

[0031] Figure 3 isFigure 2 A-A sectional view of the base of the present application;

[0032] Figure 4 top view of the base of the embodiment 1 of the present application;

[0033] Figure 5 exploded view of the embodiment 2 of the present application;

[0034] Figure 6 schematic view of another perspective of the Figure 5

[0035] Figure 7 sectional view of the clamping assembly part in the embodiment 2 of the present application;

[0036] Figure 8 coordinate system of the base in the embodiment 3 of the present application and the label of each parameter.

[0037] Reference signs:

[0038] 1-base; 11-first arc positioning surface; 111-left side section; 112-middle section; 113-right side section 113; 12-second arc positioning surface; 13-first end surface positioning surface; 14-second end surface positioning surface; 15-positioning clamping slot; 16-reference hole; 17-locking unit hole; 18-movable positioning block; 181-adjusting bolt; 182-compression spring; 2-blade; 5-clamping assembly; 51-positioning stud; 52-threaded guide sleeve; 521-sleeve; 522-limiting disc; 53-clamping plate base; 531-supporting plate; 532-guiding sleeve; 54-clamping plate; 541-clamping end; 542-driving end; 543-first through hole; 544-first pin hole; 545-second pin hole; 55-cam wrench; 56-first pin shaft; 57-second pin shaft; 3-locking unit; 4-pressing plate; 41-outer arc positioning surface; 42-inner arc positioning surface; 43-outer ring end surface; 44-inner ring end surface; 46-arc-shaped long hole. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present application will be described in detail below with reference to the drawings, which constitute a part of the present application, and are used to explain the principles of the present application, and are not used to limit the scope of the present application.

[0040] Embodiment 1

[0041] One specific embodiment of the present application, as shown in Figures 1-4 ​As shown, a positioning device for a single set of triple turbine guide vane is disclosed, which comprises a base 1, a pressing plate 4 and a locking unit 3. The base 1 is the foundation of the overall structure, which is in the shape of a cuboid, and the upper surface thereof is the working surface. The base 1 has four edges, and the parallelism and perpendicularity between the four edges are within 0.005. The locking unit 3 can comprise elements such as bolts and studs.

[0042] Since the part is a thin-walled part, the overall rigidity is poor, and the clamping is easy to deform. If the rigidity of the clamp is also poor, the positioning surface and the positioning arc will deform, so the part cannot be clamped smoothly, or the part will be deformed during clamping. In order to solve this problem, the base 1 adopts a cuboid structure, which not only improves the overall rigidity of the clamp, but also facilitates the reference alignment and the establishment of the machining coordinate system.

[0043] Referring to Figures 1-3 , the upper surface of the base 1 has a first groove extending in the left-right direction, which has a first circular arc positioning surface 11, a second circular arc positioning surface 12, a first end surface positioning surface 13 and a second end surface positioning surface 14, which are used for accurately positioning the vane 2 (i.e. a single set of triple turbine guide vane, hereinafter referred to as vane), and the parallelism between each mutually parallel positioning surface is not greater than 0.02. Among them, the first circular arc positioning surface 11 is used to engage with the outer arc surface of the vane 2, the second circular arc positioning surface 12 is used to engage with the inner arc surface of the vane 2, the first end surface positioning surface 13 is used to engage with the end surface of the outer periphery of the vane 2, and the second end surface positioning surface 14 is used to engage with the end surface of the inner periphery of the vane 2. The first end surface positioning surface 13 is the bottom surface of the first groove, the first end surface positioning surface 13 is perpendicular to the first circular arc positioning surface 11, and the first end surface positioning surface 13 is located at the bottom of the first circular arc positioning surface 11. The second end surface positioning surface 14 is perpendicular to the second circular arc positioning surface 12, and the second end surface positioning surface 14 is located at the top of the second circular arc positioning surface 12.

[0044] Referring to Figure 3The second end face positioning surface 14 is the main positioning surface, and the first end face positioning surface 13 is the auxiliary positioning surface. Since there is a height difference between the end face of the inner circle of the blade 2 and the end face of the outer circle, to avoid over-positioning, the height difference between the first end face positioning surface 13 and the second end face positioning surface 14 of the jig base 1 should be based on the nominal value of the height difference of the matching surface of the blade 2 plus a strict tolerance. For example, if the design value of the height difference between the end face of the inner circle and the end face of the outer circle of the blade 2 is H, then the height difference between the first end face positioning surface 13 and the second end face positioning surface 14 of the base 1 can be determined as H±0.02mm, and the distance between the end face of the inner circle and the end face of the outer circle of the blade 2 is usually machined with a nominal value. Therefore, the height difference between the first end face positioning surface 13 and the second end face positioning surface 14 of the base 1 is designed and machined as H±0.02mm, which can effectively avoid the occurrence of over-positioning. Even if there is slight over-positioning between the two positioning surfaces, the first end face positioning surface 13 can compensate for the influence of the machining position and the machining reference, and the influence is minimal.

[0045] Referring to Figure 2 A positioning slot 15 is further arranged on the upper surface of the base 1, which extends from the middle of the second circular arc positioning surface 12 to the front side, is used for clamping with the positioning block protruding inward on the inner circumferential surface of the blade 2, and realizes the angular positioning of the blade 2.

[0046] Referring to Figures 1-3 Through the cooperation between the above-mentioned two circular arc positioning surfaces 11-12, two end face positioning surfaces 13-14 and one positioning slot 15, the position of the blade 2 can be preliminarily determined, and the stability and accuracy of the blade 2 on the base 1 are ensured.

[0047] Further referring to Figure 4 The first circular arc positioning surface 11 is divided into three sections, i.e., a left section 111, a middle section 112 and a right section 113. The radius of the middle section 112 is equal to the radius of the outer circular arc surface of the blade 2, the radius of the left section 111 and the right section 113 are both greater than the radius of the outer circular arc surface of the blade 2, and the middle section 112 is circularly arc transitioned with the left section 111 and the right section 113.

[0048] According to the deformation trend of the blade 2 during service, i.e., the outward expansion trend of the circular arcs at the inner and outer ring openings, if the inner and outer ring circular arcs are designed according to the conventional circular arc size, interference will easily occur between the first circular arc positioning surface 11 and the blade 2, and at the same time, due to the outward expansion deformation of the circular arcs at the edges of the two ends of the blade 2, the inner circular arc surface will not interfere with the second circular arc positioning surface 12. In order to solve this problem, the second circular arc positioning surface 12 is selected as the main positioning surface, and the first circular arc positioning surface 11 is selected as the auxiliary positioning surface. The first circular arc positioning surface 11 is divided into three sections, i.e., a middle section 112, a left section 111 and a right section 113.

[0049] The middle section 112 of the first arc positioning surface 11 is symmetrically arranged with the center line of the positioning clamping groove 15 as the axis of symmetry, and the central angle corresponding to the middle section 112 is within 6°, which cooperates with the outer arc surface of the blade 2 to assist in positioning. The arc radius of the left section 111 and the right section 113 is increased by 1-2 mm relative to the arc radius of the middle section 112, and is smoothly connected through appropriate fillets. Since the main positioning and the auxiliary positioning arc still cooperate with the center section arc of the blade 2, the theoretical position of the center of the arc will not change. And it is ensured that the blade 2 can still be placed on the positioning surface for positioning and clamping after deformation. This makes the numerical control machining work smoothly.

[0050] Further, the first groove of the base 1 is also provided with locking unit holes 17, which are uniformly distributed, and the centers of the locking unit holes 17 are located on the center line of the blade gap of the blade 2, which are used for the locking unit 3 to pass through the pressing plate 4 to press the blade. The locking unit holes 17 are preferably provided with 6, which are uniformly distributed in the three blade gaps of the blade 2.

[0051] Referring to Figure 1 , Figure 3 , the pressing plate 4 is an arc-shaped plate with a T-shaped cross section. The pressing plate 4 includes an outer arc positioning surface 41, an inner arc positioning surface 42, an outer ring end surface 43, and an inner ring end surface 44.

[0052] Among them, the outer arc positioning surface 41 is connected with the inner arc surface on the outside of the top of the blade 2, and the inner arc positioning surface 42 is connected with the inner arc surface on the inside of the top of the blade 2. The gap between the two arc surfaces is large, and the gap is 0.4-0.6 mm. The outer ring end surface 43 is connected with the top surface on the outside of the blade 2, and the inner ring end surface 44 is connected with the top surface on the inside of the blade 2.

[0053] The pressing plate 4 is provided with 6 locking through holes, which are correspondingly arranged with the locking unit holes 17 on the base 1. After the blade 2 is placed in the first groove of the base 1, the pressing plate 4 is pressed on the top of the blade 2, and then the locking unit 3 is inserted into the locking unit hole 17 on the base 1 through the locking through hole, and then the nut is locked to press the blade 2 on the base 1.

[0054] This pressing method can prevent the blade 2 from deforming during clamping, avoid the machining position, and ensure that the inner and outer ring end surfaces of the pressing plate 4 and the blade 2 are almost completely in contact, so that the pressing force is uniform and stable.

[0055] In addition, in order to facilitate positioning during machining, the upper surface of the base 1 is also provided with a reference hole 16, such as Figure 2 and Figure 4The reference hole 16 is arranged at the lower left corner of the base 1, a distance below the second circular arc positioning surface 12, and the left side of the positioning slot 15, and needs to ensure that the reference hole 16 is not blocked by the inwardly protruding part on the inner circular arc surface of the blade 2.

[0056] By arranging the reference hole 16, the angular positioning of the blade 2 is realized, and an accurate machining coordinate system can also be established as a reference point, simplifying the numerical control machining process and improving the machining accuracy and consistency.

[0057] The base 1 is provided with the reference hole 16, the blade 2 is positioned by the circular arc surface and the slot, and is placed in the device, so that the Y-axis passes through the center of the reference hole 16. The distance between the center position of the reference hole 16 and the edge of the base 1 can directly determine the origin of the numerical control program coordinate system. At the same time, the machining reference of the blade 2 is converted to the reference hole and the positioning surface of the device, and the tool / grinding wheel can accurately reach the coordinate position of the surface to be machined of the blade 2, simplifying the numerical control machining process.

[0058] The device breaks the conventional group machining mode of three-union turbine guide vane blades, realizes rapid positioning, efficient and quick machining of single group three-union turbine guide vane blades, and has more flexibility in machining and wider range of applicable numerical control machine tools. Compared with the prior art, the positioning device of single group three-union turbine guide vane blades provided in the embodiment can realize automatic positioning of the blade 2 and stable clamping.

[0059] Embodiment 2

[0060] Embodiment 2 relates to a positioning device for single group three-union turbine guide vane blades, and the embodiment 2 is a further improved technical solution based on embodiment 1. The same parts as embodiment 1 will not be described here, and the different parts from embodiment 1 will be described in detail below with reference to the drawings.

[0061] Referring to Figures 5-7 , the base 1 includes a movable positioning block 18, and the first circular arc positioning surface 11 and the first end surface positioning surface 13 are arranged on the movable positioning block 18. The movable positioning block 18 can reciprocate relative to the base 1 to approach or move away from the second circular arc positioning surface 12.

[0062] The movable positioning block 18 is provided with two parallel threaded holes, and the base 1 is correspondingly provided with two threaded holes. The rotation directions of the threaded holes on the base 1 and the movable positioning block 18 are opposite. The movable positioning block 18 is connected with the base 1 through adjusting bolts 181, and can reciprocate relative to the base 1 by rotating the adjusting bolts 181. Through this arrangement, it can be suitable for the case where the blade 2 is deformed greatly. Moreover, by controlling the torque of the two adjusting bolts 181, the pressing force on the blade 2 can be controlled. By adjusting the pressing force, the shape of the blade 2 within a certain degree of deformation can be corrected.

[0063] Preferably, a blind hole is arranged between the two threaded holes on the movable positioning block 18. A corresponding blind hole is arranged on the base 1 between the two threaded holes, and a compression spring 182 is arranged between the two blind holes. In this way, errors caused by the threaded gap of the adjusting bolt 181 can be avoided.

[0064] Further, the bottom surface of the movable positioning block 18 is inclined at a certain angle relative to the bottom surface of the base 1. Correspondingly, the bottom surface of the groove on the base 1 for accommodating the movable positioning block 18 has the same inclination angle as the bottom surface of the movable positioning block 18, and the axis of the threaded hole for arranging the adjusting bolt 181 also has the same inclination angle. In this way, when the first circular-arc positioning surface 11 is adjusted, the height difference between the first end-surface positioning surface 13 and the second end-surface positioning surface 14 can also be adjusted, so as to correct the deformation of the blade 2 in the height direction.

[0065] The positioning device of the single set of triple turbine guide vane blade of the present embodiment 2 further comprises a clamping assembly 5. The clamping assembly 5 is arranged on the base 1 and is used for quickly clamping or loosening the pressing plate 4.

[0066] Referring to Figures 5-7 , the clamping assembly 5 comprises a positioning stud 51, a threaded guide sleeve 52, a clamping base 53, a clamping plate 54, a cam wrench 55, a first pin shaft 56, and a second pin shaft 57.

[0067] The positioning stud 51 is fixedly arranged on the base 1, and the threaded guide sleeve 52 is sleeved on the positioning stud 51 and can move up and down relative to the positioning stud 51. The top of the threaded guide sleeve 52 is connected with the clamping base 53, and the threaded guide sleeve 52 can rotate relative to the clamping base 53. The threaded guide sleeve 52 comprises a sleeve 521 at the top and a limiting disc 522 at the bottom of the sleeve 521, and the diameter of the limiting disc 522 is greater than that of the sleeve 521. The inside of the sleeve 521 and the limiting disc 522 is provided with a threaded through hole for sleeving on the positioning stud 51.

[0068] The clamping base 53 comprises a support plate 531 and a guide sleeve 532 above the support plate 531, and the guide sleeve 532 and the support plate 531 are provided with through holes. The clamping base 53 is sleeved on the sleeve 521 of the threaded guide sleeve 52 through the through holes, and the support plate 531 is supported on the upper surface of the limiting disc 522. When the threaded guide sleeve 52 is rotated, the clamping base 53 can move up and down together with the threaded guide sleeve 52 relative to the positioning stud 51. At the same time, the clamping base 53 can rotate relative to the threaded guide sleeve 52.

[0069] The clamping plate 54 comprises a clamping end 541, a driving end 542, a first through hole 543, a first pin hole 544 and a second pin hole 545. The diameter of the first through hole 543 is slightly larger than the outer diameter of the guide sleeve 532 of the clamping base 53, and the clamping plate 54 can be sleeved on the outer circumferential surface of the guide sleeve 532 through the first through hole 543. The first pin hole 544 is arranged in the horizontal direction, and the central axis of the first pin hole 544 is perpendicular to the central axis of the first through hole 543. A third pin hole is correspondingly arranged on the guide sleeve 532 of the clamping base 53. The first pin shaft 56 has two, which are respectively inserted into the first pin hole 544 and the third pin hole, and the clamping plate 54 and the clamping base 53 are rotatably connected together, so that the clamping plate 54 can rotate relative to the clamping base 53 within a certain range about the central axis of the first pin shaft 56.

[0070] The two sides of the driving end 542 of the clamping plate 54 are protruding lugs, and a groove is arranged between the two lugs. The second pin hole 545 is correspondingly arranged on the two lugs, and the eccentric fourth pin hole is arranged on the cam wrench 55. The cam wrench 55 is arranged in the groove between the two lugs through the second pin shaft 57. The bottom of the cam wrench 55 abuts against the upper surface of the supporting plate 531 of the clamping base 53. The handle of the cam wrench 55 is twisted to drive the driving end 542 of the clamping plate 54 to move upward or downward, so that the clamping end 541 of the clamping plate 54 moves downward to clamp the pressing plate 4 or moves upward to release the pressing plate 4.

[0071] At the same time, a locking unit hole 17 is arranged on the base 1 at the side of the first groove bottom away from the clamping assembly 5, and a locking unit 3 is arranged in the locking unit hole 17. An arc-shaped long hole 46 is arranged in the middle of the pressing plate 4, and the top of the locking unit 3 passes through the arc-shaped long hole 46 and is locked by a nut. The pressing plate 4 can move along the arc-shaped long hole 46 relative to the locking unit 3.

[0072] According to the positioning device of the single-group triple-turbine guide vane blade of the second embodiment, when working, the movable positioning block 18 is first moved to a position away from the second circular-arc positioning surface 12, the clamping plate 54 of the clamping assembly 5 is rotated aside to avoid interference during installation of the blade 2, the locking nut on the pressing plate 4 is loosened, and the pressing plate 4 is pulled along the arc-shaped long hole to move aside to avoid interference during installation of the blade 2.

[0073] Then the blade 2 is placed in the first groove of the base 1, so that the inner circular-arc surface of the blade 2 abuts against the second circular-arc positioning surface 12, the end surface of the inner periphery of the blade 2 abuts against the second end-surface positioning surface 14, and the positioning block on the inner circumferential surface of the blade 2 is clamped in the positioning clamping groove 15.

[0074] Then the movable positioning block 18 is moved to a position where the first circular-arc positioning surface 11 is in engagement with the outer circular-arc surface of the blade 2 and a certain pressing force is applied.

[0075] Then the pressing plate 4 is placed on the top of the blade 2, so that the outer circular arc positioning surface 41 of the pressing plate 4 is engaged with the inner circular arc surface of the outer side of the top of the blade 2, the inner circular arc positioning surface 42 is engaged with the inner circular arc surface of the inner side of the top of the blade 2, the outer ring end surface 43 is engaged with the top surface of the outer side of the blade 2, and the inner ring end surface 44 is engaged with the top surface of the inner side of the blade 2.

[0076] Then the nut is locked on the top of the locking unit 3, so that one end of the pressing plate 4 is pressed against the blade 2.

[0077] Finally, the clamping plate 54 is rotated to a position where the clamping end 541 is above the pressing plate 4, and the handle of the cam wrench 55 is pulled, so that the clamping end 541 of the clamping plate 54 moves downward and clamps the pressing plate 4, thereby pressing the blade 2.

[0078] According to the device of the present embodiment 2, the blade 2 can be conveniently and quickly pressed and positioned without repeatedly tightening multiple locking units, the deformation of the blade 2 is more tolerable, and the deformation of the blade 2 can be corrected within a certain range.

[0079] Embodiment 3

[0080] The present embodiment 3 relates to a positioning method for numerically controlled machining of engine triple turbine guide vane, and a single set of triple turbine guide vane positioning device in the embodiments 1 or 2 is used for positioning the single set of triple turbine guide vane.

[0081] The design drawing required size and the actual size of the single set of triple turbine guide vane positioning device involved in the present embodiment 3 are shown in Table 1, and the zero point position and the coordinate system position of the numerical control program need to be determined, i.e. the zero point position of the O coordinate system and the directions of the X axis, Y axis and Z axis are determined.

[0082] Table 1: Device design drawing required size and actual size example

[0083] Dimensional item Drawing requirement dimension Actual dimension X’ 60.4 60.41 Y’ 15 14.99 G° 2° 1°58’ R R200±0.1 R199.95 A 35±0.1 35.02

[0084] The method comprises the following steps:

[0085] S1: Establishing a blade coordinate system: taking the bottom transverse edge of the base 1 of the present application as the X' axis, the left vertical edge as the Y' axis, and the thickness direction edge as the Z axis, and the intersection of the three edges is the O' coordinate system origin, to establish a blade coordinate system, as shown in Figure 8 .

[0086] The base 1 is measured, and the actual values of the reference hole 16 of the base 1 are 60.41, 14.99, the actual value of the radius R of the second circular positioning surface 12 is 199.95, the actual value of the maximum distance A of the second circular positioning surface 12 to the X axis is 35.02, and the actual value of the angle G° between the center line of the positioning clamping groove 15 and the center line of the reference hole 16 and the center line of the second circular positioning surface 12 is 1°58'.

[0087] S2: The coordinate axis direction is unchanged, the center of the reference hole M is taken as the initial zero point of the numerical control program, and a machine tool coordinate system On' is established on the numerical control machine tool.

[0088] S21: The clamp is pressed on the dry machine tool bed, the N surface faces the operator, the B surface is substantially parallel to the X axis direction of the machine tool spindle, and the top surface of the clamp is pressed on four corners with slight tightness;

[0089] S22: Establishing the Z zero point: the top surface of the base 1 (i.e. the plane where the reference hole 16 is located) is used to determine the Z zero point;

[0090] S22: Establishing the Xn' axis: the front surface N of the base 1 is adjusted straight along the X axis direction of the machine tool spindle from left to right, and is set as the Xn' axis;

[0091] S23: Determining the center position of the machine tool coordinate system On': the center of the positioning hole 16 is measured, the Xn' axis zero point is moved to the center position of the positioning hole 16, the direction is unchanged, and the machine tool coordinate system On' is established.

[0092] S3: The engine axis vector is taken as the final zero point of the numerical control program, and a machining coordinate system OXYZ is established on the numerical control machine tool.

[0093] S31: Calculating the Y axis offset compensation value: the Y axis offset compensation value is the amount of offset of the Y axis along the X axis direction from the blade coordinate system origin to the machining coordinate system origin, which is set as a, a=X'-Xn, if a is positive, the Y axis should offset a along the positive direction of the X axis, if a is negative, the Y axis should offset-a along the negative direction of the X axis; in this embodiment, the Y axis should be translated along the negative direction of the X axis by 0.01 mm (60.4-60.41=-0.01).

[0094] S32: Calculating the X axis offset compensation value: the X axis offset compensation value is the amount of offset of the X axis along the Y axis direction from the blade coordinate system origin to the machining coordinate system origin, which is set as B, B==Rn-An+Yn, the X axis should offset b along the negative direction of the Y axis; in this embodiment, the Y axis is translated along the negative direction of the Y axis by Y=R-A+Y'=199.95-35.02+14.99=149.94 mm.

[0095] S33: Establishing the machining coordinate system OXYZ: Moving the origin of the initial coordinate system according to the steps, the directions of the X-axis, Y-axis and Z-axis remain unchanged, and the machining coordinate system OXYZ can be obtained.

[0096] The above method can realize accurate positioning of the blade 2. After positioning is completed, the CNC center can process the inner and outer arc surfaces of the blade 2 according to the CNC program to remove the gas collecting box on the surface.

[0097] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A positioning device for a single set of triple turbine guider vane blades, characterized by, The positioning device for single set of triple turbine guide vane blades comprises a base, a pressing plate and a locking unit; the upper surface of the base is provided with a first groove extending in the left-right direction; the first groove is provided with a first circular arc positioning surface, a second circular arc positioning surface, a first end surface positioning surface and a second end surface positioning surface; the first circular arc positioning surface is the rear sidewall of the first groove; the second circular arc positioning surface is the front sidewall of the first groove; the first end surface positioning surface is the bottom surface of the first groove; and the second end surface positioning surface is a surface horizontally extending from the top of the second circular arc positioning surface to the front side; the first circular arc positioning surface is divided into three sections, i.e., a left section, a middle section and a right section; the radius of the middle section is equal to the radius of the outer circular arc surface of the blade; and the radius of each of the left section and the right section is greater than the radius of the outer circular arc surface of the blade.

2. The single set of triple turbine guider vane positioning apparatus of claim 1, wherein, The height difference between the first end surface positioning surface and the second end surface positioning surface of the base is H±0.02mm, wherein H is the height difference between the end surface of the inner periphery and the end surface of the outer periphery of the blade.

3. The positioning device for a single set of triple turbine guider vane blades of claim 2, wherein, The radius of each of the left section and the right section is greater than the radius of the outer circular arc surface of the blade by 1-2mm.

4. The positioning device for a single set of triple turbine guider vane blades of claim 3, wherein, The central angle of the middle section is within the range of 6°.

5. The positioning device for a single set of triple turbine guider vane blades of claim 4, wherein, The pressing plate is an arc-shaped plate with a T-shaped cross section.

6. The positioning device for a single set of triple turbine guider vane blades of claim 5, wherein, The upper surface of the base is further provided with a positioning clamping groove extending from the middle of the second circular arc positioning surface to the front side.

7. The positioning device for a single set of triple turbine guider vane blades of claim 6, wherein, The middle section is symmetrically arranged with the center line of the positioning clamping groove.

8. A method of positioning a single set of triple turbine guider vane blades, characterized by, The positioning device for single set of triple turbine guide vane blades is used for positioning single set of triple turbine guide vane blades.

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