Duplex precision casting guide vane clamping device

Abstract

The application relates to a double precision casting guide vane clamping device and relates to the clamping technical field of gas turbine turbine guide vanes. In order to solve the problem that a special fixture and a gauge are needed for each part machining, the clamping frequency is high, the reference conversion is frequent, the size deviation of each part of the vane is large, the machining precision is low, and the blade radial surface needs to be repeatedly ground during assembly to meet the assembly requirements, the clamping device comprises a bottom plate, a large-head positioning plate, a bolt I, a nut I, a large-head pressing plate, a small-head positioning seat, a bolt II, a nut II, a small-head pressing plate, a bolt III, a nut III and a small-head air outlet side pressing plate; the left side of the upper end face of the bottom plate is fixed with the large-head positioning plate; two clamping jaws are arranged on the large-head pressing plate at intervals; the upper end face of the bottom plate is fixed with the bolt I; and the large-head pressing plate is slidably connected to the bolt I. The application is used for clamping the gas turbine turbine guide vanes.

Description

Technical Field

[0001] This invention relates to the field of gas turbine guide vane clamping technology, and in particular to a clamping device for double precision-cast guide vanes. Background Technology

[0002] The turbine guide vanes of a gas turbine are key stationary components in the turbine stage, installed in front of the rotor blades. Their main function is to efficiently convert the thermal energy of the high-temperature, high-pressure gas into kinetic energy and precisely guide the airflow direction so that it impacts the blades at the optimal angle, thereby driving the rotor to rotate and output power. Their design directly affects the efficiency, power, and reliability of the gas turbine.

[0003] The inner and outer edge plates of gas turbine guide vanes are relatively thin. To increase the rigidity of the edge plates, stiffening ribs are designed at the ends of the inner and outer edge plates. Due to the complexity of the stiffening rib structure and the difficulty of machining, it is impossible to pre-leave process tacks for clamping at the ends of the inner and outer edge plates during casting. This results in high difficulty in blade clamping and low automation. Current machining adopts a sequential machining method, requiring a set of special fixtures and measuring tools for each part. This results in numerous clamping operations and frequent datum changes, further leading to large dimensional deviations in various parts of the blade, low machining accuracy, and the need for repeated grinding of the radial surface of the blade to meet assembly requirements during assembly. Summary of the Invention

[0004] To address the problems arising from the current practice of machining gas turbine guide vanes using a sequential machining process, which requires a dedicated set of fixtures and measuring tools for each part, resulting in numerous clamping operations, frequent reference changes, large dimensional deviations in various parts of the blade, low machining accuracy, and the need for repeated grinding of the blade radial surface during assembly to meet assembly requirements, this invention provides a double-jointed precision-cast guide vane clamping device to solve the problems mentioned in the background art.

[0005] The technical solution of this invention is:

[0006] A clamping device for double precision-cast guide vanes includes a base plate, a large-end positioning plate, bolt I, nut I, a large-end pressure plate, a small-end positioning seat, bolt II, nut II, a small-end pressure plate, bolt III, nut III, and a small-end outlet side pressure plate;

[0007] A large-head positioning plate is fixed on the left side of the upper end face of the base plate. Two clamping claws are spaced apart on the large-head pressure plate. Bolt I is fixed on the upper end face of the base plate. The large-head pressure plate is slidably connected to bolt I. Nut I is threadedly connected to bolt I. The height of the large-head pressure plate can be adjusted by nut I to be installed above the large-head positioning plate.

[0008] A small-end positioning seat is fixed on the right side of the upper end face of the base plate. A positioning block protruding from the left end face of the small-end positioning seat is provided on the small-end positioning seat. Bolt II is fixed on the small-end positioning seat. The small-end pressure plate is slidably connected to bolt II. Nut II is threadedly connected to bolt II. The height of the small-end pressure plate can be adjusted by nut II and installed above the small-end positioning seat.

[0009] Two bolts III are fixed on the base plate. Each bolt III is threaded with a nut III. A small-head vent side pressure plate is slidably connected to the two bolts III. The small-head vent side pressure plate can be installed above the base plate by adjusting the height of the nut III.

[0010] Furthermore, the base plate is provided with two inner radial positioning seats, each with an inclined end face. Bolts IV are threaded onto the inclined end faces, and nuts IV for fixing bolts IV to the inclined end faces are threaded onto bolts IV.

[0011] Furthermore, two air passage back arc positioning pins are provided on the transverse centerline of the base plate.

[0012] Furthermore, two small end edge plate arc positioning pins are fixed on the base plate, and the small end edge plate arc positioning pins are located on the left side of the small end positioning seat.

[0013] Furthermore, the large-end pressure plate has a waist-shaped hole I, through which bolt I passes through the large-end pressure plate; the small-end pressure plate has a waist-shaped hole II, through which bolt II passes through the small-end pressure plate.

[0014] Furthermore, a support screw I is fixed to the lower end of the large-end pressure plate, and the lower end of the support screw I abuts against the base plate; a support screw II is fixed to the lower end of the small-end pressure plate, and the lower end of the support screw II abuts against the small-end positioning seat.

[0015] Furthermore, the left end face of the small-head positioning seat and the positioning block is set in an arc shape.

[0016] Furthermore, the angle between the inclined end face of the inner radial positioning seat and the base plate is 55°.

[0017] Furthermore, the positioning block has several empty tool slots.

[0018] Furthermore, two air passage pressure plate screws are fixed to the upper end face of the base plate.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. A clamping device for double-jointed precision-cast guide vanes, comprising a large-end pressure plate, a small-end pressure plate, and a small-end outlet side pressure plate, providing three pressure plates for clamping and fixing gas turbine guide vanes. During machining, the large-end and small-end pressure plates are first used to fix the gas turbine guide vanes, allowing for machining of the large-end outlet side arc positioning groove, axial positioning groove, and outlet side plane, as well as the small-end outlet side plane and the radial area between the large and small ends. After machining, the small-end outlet side pressure plate is installed and then removed, allowing for machining of the outlet side and both sides of the pin. In a single clamping operation, by swapping the small-end and small-end outlet side pressure plates, the gas turbine guide vane can be fixed and clamped, and multiple parts can be machined, achieving semi-integrated blade machining, shortening the process flow, and significantly improving blade machining accuracy by reducing datum conversion.

[0021] 2. An inner radial positioning seat is provided to provide auxiliary support for the inner radial direction of the large and small head flanges, preventing blade displacement when the clamping force alone is insufficient to resist the machining resistance. By adjusting the height of bolt IV on the inner radial positioning seat, auxiliary support for the inner radial direction of the large and small head flanges of gas turbine guide vanes of different sizes can be achieved. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention after the gas turbine guide vanes are clamped. Figure I ;

[0023] Figure 2 This is a schematic diagram of the structure of the present invention after the gas turbine guide vanes are clamped. Figure II ;

[0024] Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure I ;

[0025] Figure 4 This is a schematic diagram of the overall structure of the present invention. Figure II ;

[0026] Figure 5 A schematic diagram of the structure of the airway back arc positioning pin and the small end edge plate arc positioning pin;

[0027] Figure 6 Schematic diagram of the large-head pressure plate Figure I ;

[0028] Figure 7 Schematic diagram of the large-head pressure plate Figure II ;

[0029] Figure 8 This is a schematic diagram of the small-head positioning seat;

[0030] Figure 9 This is a schematic diagram of the structure of an empty tool groove;

[0031] Figure 10 This is a schematic diagram of the inner radial positioning seat.

[0032] In the diagram: 1. Base plate; 201. Large-end positioning plate; 202. Bolt I; 203. Nut I; 204. Large-end pressure plate; 205. Clamping jaw; 301. Small-end positioning seat; 302. Positioning block; 303. Bolt II; 304. Nut II; 305. Small-end pressure plate; 401. Bolt III; 402. Nut III; 403. Small-end exhaust side pressure plate; 501. Inner radial positioning seat; 502. Inclined end face; 503. Bolt IV; 504. Nut IV; 6. Air passage back arc positioning pin; 7. Small-end edge plate arc positioning pin; 206. Support screw I; 306. Support screw II; 307. Empty knife groove; 8. Air passage pressure plate screw. Detailed Implementation

[0033] Specific implementation method one: See Figure 1-5 As shown, a double-jointed precision-cast guide vane clamping device, in this embodiment, includes a base plate 1, a large-end positioning plate 201, bolt I 202, nut I 203, a large-end pressure plate 204, a small-end positioning seat 301, bolt II 303, nut II 304, a small-end pressure plate 305, bolt III 401, nut III 402, and a small-end air outlet side pressure plate 403;

[0034] A large-head positioning plate 201 is fixed on the left side of the upper end face of the base plate 1. Two clamping claws 205 are spaced apart on the large-head pressure plate 204. A bolt I 202 is fixed on the upper end face of the base plate 1. The large-head pressure plate 204 is slidably connected to the bolt I 202. A nut I 203 is threaded on the bolt I 202. The height of the large-head pressure plate 204 can be adjusted by the nut I 203 to be installed above the large-head positioning plate 201.

[0035] A small-end positioning seat 301 is fixed on the right side of the upper end face of the base plate 1. A positioning block 302 protruding from the left end face of the small-end positioning seat 301 is provided on the small-end positioning seat 301. A bolt II 303 is fixed on the small-end positioning seat 301. A small-end pressure plate 305 is slidably connected to the bolt II 303. A nut II 304 is threadedly connected to the bolt II 303. The height of the small-end pressure plate 305 can be adjusted by the nut II 304 and installed above the small-end positioning seat 301.

[0036] Two bolts Ⅲ401 are fixed on the base plate 1. Each bolt Ⅲ401 is threaded with a nut Ⅲ402. A small-head air outlet side pressure plate 403 is slidably connected to the two bolts Ⅲ401. The small-head air outlet side pressure plate 403 can be installed above the base plate 1 by adjusting the height of the nut Ⅲ402.

[0037] Furthermore, the flatness of the upper surface of the base plate 1 is 0.03, the upper surface of the base plate 1 serves as a reference surface, the parallelism between the lower surface and the upper surface of the base plate 1 is 0.03, and the perpendicularity between the back arc side of the base plate 1 and the upper surface of the base plate 1 is 0.03. Several pin holes and bolt holes are provided on the left and right sides of the base plate 1 for fixing the large-end positioning plate 201 and the small-end positioning seat 301. The large-end positioning plate 201 is 13mm thick with a tolerance of ±0.02. The large-end positioning plate 201 has two 8mm diameter pin holes and three countersunk threaded holes. The large-end positioning plate 201 is fixed to the base plate 1 with pins, and then further fixed with bolts. The small-end positioning seat 301 has a total height of 72.5mm with a tolerance of ±0.02, used to ensure the positioning accuracy of the height difference between the air intake side of the large-end flange and the air intake side of the small flange after clamping. To avoid obstructing the small-end edge plate's arc-shaped positioning pin 7, a positioning block 302 is provided protruding from the left end face of the small-end positioning seat 301. To ensure clamping rigidity and avoid stress concentration during clamping, a 45° chamfer is provided at the lower connection between the positioning block 302 and the small-end positioning seat 301. The small-end positioning seat 301 is fixed to the base plate 1 by pins and bolts. The large-end pressure plate 204 is designed with a triangular structure, with two clamping jaws 205 spaced apart to avoid interference with the blade's high point during clamping. The small-end exhaust side pressure plate 403 is a strip-shaped pressure plate with a width of 34mm, a thickness of 22mm, and a total length of 245mm. It is pressed on the small-end exhaust side and is used to process the edge plate where the pin is located, the exhaust side of the pin, and both sides of the pin. The small-end exhaust side pressure plate 403 has oblong holes at both ends for the bolt Ⅲ401 to pass through.

[0038] In use, rotate nut I 203, which presses down on the large-end pressure plate 204. The large-end pressure plate 204 and the large-end positioning plate 201 clamp the inlet side edge plate of the gas turbine guide vane, completing the large-end clamping of the blade. Rotate nut II 304, which presses down on the small-end pressure plate 305. The small-end pressure plate 305 and the positioning block 302 clamp the inlet side edge plate where the small-end pin of the gas turbine guide vane is located, completing the small-end clamping of the blade. Rotate nut III 402, which presses down on the small-end outlet side pressure plate 403, completing the middle clamping of the blade.

[0039] Furthermore, by setting three pressure plates—the large-end pressure plate 204, the small-end pressure plate 305, and the small-end outlet side pressure plate 403—two sets of alternating clamping and fixing can be used to fix the gas turbine guide vane. During machining, the large-end pressure plate 204 and the small-end pressure plate 305 are first used to fix the gas turbine guide vane, allowing for machining of the large-end outlet side arc, the outlet side arc positioning groove, the axial positioning groove and the outlet side plane, the small-end outlet side plane, and the radial area between the large and small ends. After machining is completed, the small-end outlet side pressure plate 403 is installed and the small-end pressure plate 305 is removed, allowing for machining of the outlet side and both sides of the pin. In a single clamping operation, by swapping the small-end pressure plate 305 and the small-end outlet side pressure plate 403, the gas turbine guide vane can be fixed and clamped, and multiple parts can be machined. This achieves semi-integrated blade machining, shortens the process flow, and significantly improves the machining accuracy of the blade by reducing datum conversion.

[0040] Specific Implementation Method Two: See Figure 5 and 10 As shown, the base plate 1 of this embodiment is provided with two inner radial positioning seats 501, and the inner radial positioning seats 501 are provided with an inclined end face 502. The inclined end face 502 is threaded with a bolt IV 503, and the bolt IV 503 is threaded with a nut IV 504 for fixing the bolt IV 503 and the inclined end face 502.

[0041] Furthermore, the inner radial positioning seat 501 is an auxiliary positioning block, which provides auxiliary support for the inner radial direction of the large and small head flanges, preventing blade displacement when the clamping force alone is insufficient to resist the machining resistance of the machine tool. An M12 bolt hole is centrally and vertically positioned on the inclined end face 502 of the inner radial positioning seat 501 for installing hexagonal bolts and nuts. Adjusting the bolt height ensures it is flush with the inner radial direction, thus providing auxiliary support for the gas turbine guide vanes.

[0042] Specific implementation method three: See Figure 5 As shown, in this embodiment, two airway back arc positioning pins 6 are provided on the transverse centerline of the base plate 1.

[0043] Furthermore, two 20mm diameter locating pin holes are formed on the longitudinal axis of the base plate 1. These holes are located near the large-end locating plate 201 and the small-end locating seat 301, respectively. Two 20mm diameter air passage back arc locating pins 6 are fitted into these holes with an H7 fit precision. The air passage back arc locating pins 6 are used for positioning the intermediate air passage back arc. During clamping, the intermediate air passage back arc of the gas turbine guide vane is pressed tightly against the air passage back arc locating pins 6 to complete the positioning of the blade in the width direction of the base plate.

[0044] Specific implementation method four: As shown in 5, two small end plate arc positioning pins 7 are fixed on the base plate 1 in this embodiment. The small end plate arc positioning pins 7 are located on the left side of the small end positioning seat 301.

[0045] Furthermore, two 10mm diameter locating pin holes are formed on the base plate 1 near the small end locating seat 301. Two 10mm diameter small end edge plate arc locating pins 7 are fitted with the aforementioned locating pin holes with an H7 fit precision. The small end edge plate arc locating pins 7 are used for arc positioning of the small end edge plate. During clamping, the arc of the small end edge plate of the gas turbine guide vane is pressed against the small end edge plate arc locating pins 7 to achieve two-point contact positioning with the arc surface, thus completing the positioning of the blade in the length direction of the base plate.

[0046] Specific implementation method five: See Figure 6-8 As shown, in this embodiment, the large-end pressure plate 204 has a waist-shaped hole I, through which bolt I 202 passes. The waist-shaped hole I is used to adjust the relative lateral distance between the large-end pressure plate 204 and bolt I 202. The small-end pressure plate 305 has a waist-shaped hole II, through which bolt II 303 passes. The waist-shaped hole II is used to adjust the relative lateral distance between the small-end pressure plate 305 and bolt II 303.

[0047] Specific implementation method six: See Figure 6-8 As shown, in this embodiment, the lower end of the large-head pressure plate 204 is fixed with a support screw I 206, and the lower end of the support screw I 206 abuts against the base plate 1; the lower end of the small-head pressure plate 305 is fixed with a support screw II 306, and the lower end of the support screw II 306 abuts against the small-head positioning seat 301.

[0048] Furthermore, the end of the large-end pressure plate 204 away from the gripper 205 is provided with an M16 bolt hole, and the support screw I 206 is fixed in the bolt hole. During clamping, the support screw I 206 acts as a lever fulcrum, causing the nut I 203 to be tightened. The support screw I 206 is supported on the base plate 1, and the nut I 203 presses down on the large-end pressure plate 204, causing the gripper 205 to press the blade. The support screw II 306 works in the same way.

[0049] Detailed implementation method seven: See Figure 8 As shown, the left end face of the small head positioning seat 301 and the positioning block 302 in this embodiment is set as an arc shape.

[0050] Furthermore, to avoid the arc of the lower end face of the gas turbine guide vane, the small end positioning seat 301 and the positioning block 302 are designed to be arc-shaped.

[0051] Detailed Implementation Method Eight: See also Figure 10As shown, in this embodiment, the tilt angle between the tilt end face 502 of the inner radial positioning seat 501 and the base plate 1 is designed according to the inner radiality of the blade, and the tilt angle is 45-65°, preferably 55°.

[0052] Detailed Implementation Method Nine: See also Figure 9 As shown, the positioning block 302 of this embodiment has several empty tool slots 307.

[0053] Furthermore, two empty slots 307 are provided, each 20mm wide and 20mm deep. After the blade is clamped, the pin side of the gas turbine guide vane is located at the upper end of the empty slot, allowing the pin sides of the gas turbine guide vane to be machined after the small end pressure plate 305 is removed.

[0054] Detailed Implementation Method Ten: See [link / details] Figure 3 As shown, in this embodiment, two air passage pressure plate screws 8 are fixed on the upper end surface of the base plate 1.

[0055] Furthermore, by setting the air passage pressure plate screw 8, the small end air outlet side pressure plate 403 can be fixed on the air passage pressure plate screw 8, and the air passage of the gas turbine turbine guide vane is fixed by pressing the small end air outlet side pressure plate 403.

[0056] The processing steps are as follows: Place the blade on the fixture with the large-end flange inlet side corresponding to the large-end pressure plate 204 and the small-end pin inlet side corresponding to the small-end pressure plate 305. Ensure the back arc of the air passage in the middle of the blade is tightly against the two air passage back arc positioning pins 6 on the base plate 1, and the small-end end face arc is tightly against the two small-end flange arc positioning pins 7 on the base plate 1. If all four positioning pins cannot be tightly against each other, remove the air passage back arc positioning pin 6 near the small-end flange. Tighten the large-end pressure plate 204 and the small-end pressure plate 305. Use a dial indicator mounted on the machine tool spindle to check the runout of the air edge arc. If it is unqualified, adjust the gap between the blade and the air passage back arc positioning pin 6 or the small-end flange arc positioning pin 7 to make the runout acceptable. After passing the test, adjust the inner radial positioning seat 501 bolt to ensure complete contact between the inner radial positioning seat 501 bolt and the inner radial surface of the blade. Start by machining the arc positioning groove, axial positioning groove and air outlet side plane of the large end, then machine the air outlet side plane of the small end, and then machine the radial back of the large and small ends; after machining, install the small end air outlet side pressure plate 403, clamp it and then remove the small end pressure plate 305, and machine the air outlet side and both sides of the pin; until the blade is completely machined.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A clamping device for double-jointed precision-cast guide vanes, characterized in that: It includes a base plate (1), a large-end positioning plate (201), bolt I (202), nut I (203), a large-end pressure plate (204), a small-end positioning seat (301), bolt II (303), nut II (304), a small-end pressure plate (305), bolt III (401), nut III (402), and a small-end vent side pressure plate (403); A large-head positioning plate (201) is fixed on the left side of the upper end face of the base plate (1). Two clamping claws (205) are spaced apart on the large-head pressure plate (204). A bolt I (202) is fixed on the upper end face of the base plate (1). The large-head pressure plate (204) is slidably connected to the bolt I (202). A nut I (203) is threaded on the bolt I (202). The height of the large-head pressure plate (204) can be adjusted by the nut I (203) and installed above the large-head positioning plate (201). A small-end positioning seat (301) is fixed on the right side of the upper end face of the base plate (1). A positioning block (302) protruding from the left end face of the small-end positioning seat (301) is provided on the small-end positioning seat (301). A bolt II (303) is fixed on the small-end positioning seat (301). A small-end pressure plate (305) is slidably connected to the bolt II (303). A nut II (304) is threadedly connected to the bolt II (303). The small-end pressure plate (305) can be installed above the small-end positioning seat (301) by adjusting the height of the nut II (304). Two bolts Ⅲ (401) are fixed on the base plate (1). Each bolt Ⅲ (401) is threaded with a nut Ⅲ (402). A small-head air outlet side pressure plate (403) is slidably connected to the two bolts Ⅲ (401). The small-head air outlet side pressure plate (403) is installed above the base plate (1) by adjusting the height of the nut Ⅲ (402).

2. The clamping device for double-jointed precision-cast guide vanes according to claim 1, characterized in that: The base plate (1) is provided with two inner radial positioning seats (501), and the inner radial positioning seats (501) are provided with an inclined end face (502). The inclined end face (502) is threaded with a bolt IV (503), and the bolt IV (503) is threaded with a nut IV (504) for fixing the bolt IV (503) and the inclined end face (502).

3. The clamping device for double-jointed precision-cast guide vanes according to claim 1, characterized in that: Two airway back arc positioning pins (6) are provided on the transverse centerline of the base plate (1).

4. The clamping device for double-jointed precision-cast guide vanes according to claim 1, characterized in that: Two small end plate arc positioning pins (7) are fixed on the base plate (1), and the small end plate arc positioning pins (7) are located on the left side of the small end positioning seat (301).

5. The clamping device for double-jointed precision-cast guide vanes according to claim 1, characterized in that: The large end pressure plate (204) has a waist-shaped hole I, and bolt I (202) passes through the large end pressure plate (204) through the waist-shaped hole I; the small end pressure plate (305) has a waist-shaped hole II, and bolt II (303) passes through the small end pressure plate (305) through the waist-shaped hole II.

6. The clamping device for double-jointed precision-cast guide vanes according to claim 1, characterized in that: The lower end of the large-head pressure plate (204) is fixed with a support screw I (206), and the lower end of the support screw I (206) abuts against the base plate (1); the lower end of the small-head pressure plate (305) is fixed with a support screw II (306), and the lower end of the support screw II (306) abuts against the small-head positioning seat (301).

7. The clamping device for double-jointed precision-cast guide vanes according to claim 1, characterized in that: The left end face of the small head positioning seat (301) and the positioning block (302) is set in an arc shape.

8. The clamping device for double-jointed precision-cast guide vanes according to claim 2, characterized in that: The tilt angle between the tilted end face (502) of the inner radial positioning seat (501) and the base plate (1) is 55°.

9. The clamping device for double-jointed precision-cast guide vanes according to claim 1, characterized in that: The positioning block (302) has several empty tool slots (307).

10. The clamping device for double-jointed precision-cast guide vanes according to claim 1, characterized in that: Two air passage pressure plate screws (8) are fixed on the upper end face of the base plate (1).

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