A device for precision grinding of turbine disk blade components

Abstract

The present invention discloses a device for precision grinding of a turbine disc blade assembly. The turbine disc blade assembly includes a turbine disc in the middle, turbine blades are distributed on the outer edge of the turbine disc, gear discs are arranged on both sides of the turbine disc, and a positioning assembly is included for pressing and positioning the turbine disc blade assembly. The positioning assembly includes a first end tooth clamp, a second end tooth clamp, and a center piece. The first end tooth clamp and the second end tooth clamp are highly meshed with the gear discs on both sides of the turbine disc, respectively; one end of the center piece is fixedly connected to the first end tooth clamp by a screw, and the other end of the center piece is fixedly connected to the second end tooth clamp by a tightening screw. The present invention is to make a matching connection through the end tooth surface of the turbine disc blade assembly. The end tooth surfaces of both parties are formed by precision machining and have a good meshing degree, which can ensure that the axis lines are collinear when the pair of turbine disc blade assemblies are subjected to a precise grinding process, and ensure that the grinding process of the turbine blades is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a device for precision grinding of turbine disk blade components. Background Art

[0002] Before assembling the turbine disk blade assembly, all blades on the turbine disk need to be precisely ground so that the diameter range of the turbine blades reaches the specified value, so as to ensure that the gap between the turbine blades and the stator meets the process requirements. Precision grinding of riveted turbine blades requires that the grinding circular surface has a high coaxiality relative to the center axis of the turbine disk, which requires that the end teeth of the turbine disk blade assembly grinding device and the end teeth of the turbine disk have a high degree of meshing, and that the top hole and end tooth surface of this device also have a high degree of coaxiality.

[0003] The turbine disk in the existing turbine rotor grinding fixture is connected to the support by screws, that is, the turbine disk blade assembly is clamped by the supports on the inner end surfaces of both sides of the turbine disk, thereby realizing the clamping process of the turbine disk blade assembly. However, the inner end surfaces on both sides of the turbine disk are non-machined surfaces. These two surfaces may have uneven surfaces, or the plane and the outer cylindrical surface of the turbine disk may not be perpendicular. The turbine disk blade assembly clamped in this way cannot guarantee the requirements for the shape and position tolerance of the outer cylindrical surface of the turbine blade during the process of external cylindrical precision grinding. Summary of the invention

[0004] The object of the present invention is to provide a device which can ensure that all axes of a clamped turbine disk blade assembly are in line with each other and realize precision grinding of the turbine disk blade assembly.

[0005] The present invention is achieved through the following technical scheme: a device for precision grinding of a turbine disk blade assembly, wherein the turbine disk blade assembly includes a turbine disk in the middle, turbine blades are distributed on the outer edge of the turbine disk, gear disks are arranged on both sides of the turbine disk, including a positioning assembly for pressing the turbine disk blade assembly and positioning it, the positioning assembly includes a first end tooth clamp on the left, a second end tooth clamp on the right, and a center piece passing through the middle of the turbine disk blade assembly, end teeth are arranged on the right side of the first end tooth clamp and the left side of the second end tooth clamp, and are respectively highly meshed with the gear disks on both sides of the turbine disk; one end of the center piece is fixedly connected to the first end tooth clamp by a screw, and the other end of the center piece is fixedly connected to the second end tooth clamp by a tightening screw passing through the second end tooth clamp, the first end tooth clamp, the second end tooth clamp, the turbine disk blade assembly, and the center piece constitute a whole, and the axis lines of the four are collinear.

[0006] The connection between the existing device and the turbine disk blade assembly is through the internal end surface of the assembly. The internal end surface is a non-machined surface and cannot maintain a good perpendicularity with the outer cylindrical surface of the turbine disk. In this way, the existing device cannot make the axis of the entire assembly collinear. The technical solution is to make a matching connection through the end tooth surface of the turbine disk blade assembly. The end tooth surfaces of both parties are formed by precision machining and have a good meshing degree, which can ensure the collinearity of the axis of the assembly.

[0007] In order to better realize the present invention, it further includes a fixing component for fixing the positioning component, the fixing component includes a first fixing sleeve and a second fixing sleeve, the first end tooth clamping piece is embedded in the first fixing sleeve, the second end tooth clamping piece is embedded in the second fixing sleeve, and the first fixing sleeve and the second fixing sleeve are both provided with a clamping ring on the side close to the turbine disk blade assembly, and the clamping ring is in close contact with the inner edge of the turbine disk of the turbine disk blade assembly.

[0008] In order to better realize the present invention, further, the ends of the first end tooth clamping piece and the second end tooth clamping piece are provided with 4 long through grooves extending to the middle of the shaft end, and the middle of the first end tooth clamping piece and the second end tooth clamping piece are provided with a clamping cross plate, and the clamping cross plate is embedded in the middle of the first end tooth clamping piece or the second end tooth clamping piece through the long through groove at the end of the first end tooth clamping piece or the second end tooth clamping piece, and clamps the first fixing sleeve or the second fixing sleeve;

[0009] The middle part of the clamping cross disk embedded in the first end tooth clamping piece is penetrated by the center piece, and the penetration end of the center piece is provided with an external thread, which is connected to a first locking nut through a thread, and the first locking nut presses the clamping cross disk penetrated by the center piece;

[0010] The middle part of the clamping cross disk embedded in the second end tooth clamping piece is penetrated by the tightening screw, and the penetration end of the tightening screw is provided with an external thread, which is threadedly connected to a second locking nut, and the second locking nut tightens the clamping cross disk penetrated by the tightening screw.

[0011] In order to better realize the present invention, further, the long through grooves arranged at the ends of the first end tooth clamping member and the second end tooth clamping member are symmetrically distributed, and the clamping cross plate is in a "cross" shape.

[0012] To better implement the present invention, further, turbine blade clamps are evenly distributed on the outer edges of the first fixing sleeve and the second fixing sleeve, the number of the turbine blade clamps is twice the number of turbine blades, and every two turbine blade clamps clamp one turbine blade.

[0013] In order to better realize the present invention, further, the turbine blade clamp also includes a mounting block fixedly connected to the outer edge of the first fixing sleeve or the second fixing sleeve, a clamping rod is embedded in the lower part of the mounting block, one end of the clamping rod passes through the mounting block, a spring is nested on the clamping rod arranged in the mounting block, the end of the clamping rod passing through the mounting block is threadedly connected with a tightening nut, and the other end of the clamping rod is tightly pressed against the annular flange of the turbine disk blade assembly by spring pressure.

[0014] To better implement the present invention, further, the mounting block is fixedly connected to the outer edge of the first fixing sleeve or the second fixing sleeve through fixing bolts.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] (1) The present invention uses the end tooth surfaces of the turbine disk blade assembly for matching connection. The end tooth surfaces of both parties are formed by precision machining and have a good meshing degree, which can ensure that the axes of the turbine disk blade assembly are collinear during the precise grinding process and meet the requirements of the outer cylindrical surface shape and position tolerance of the turbine blade;

[0017] (2) The present invention uses an internal locking nut for tightening, rather than using the turbine blades, so that both sides of the turbine blades can be processed, thereby increasing the processable area of ​​the turbine disk blade assembly;

[0018] (3) The present invention fixes the components by pressing the components with a separate pressing rod, and each small component is positioned on the pressing block, thereby ensuring the accuracy of positioning;

[0019] (4) The present invention improves the existing fixture of the turbine disk blade assembly, making its structural setting more reasonable and the grinding more precise, thereby improving the high-precision grinding efficiency of the turbine disk blade assembly, saving the manufacturing cost of the turbine disk blade assembly, and being suitable for wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments with reference to the following drawings:

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the turbine disk blade assembly in the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the first end tooth clamping member in the present invention;

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the second end tooth clamping member in the present invention.

[0025] Among them: 1—turbine disk blade assembly, 2—first end tooth clamping piece, 3—second end tooth clamping piece, 4—center piece, 5—first locking nut, 6—tensioning screw, 7—second locking nut, 8—screw, 9—first fixing sleeve, 10—second fixing sleeve, 11—clamping ring, 12—clamping pin, 13—mounting block, 14—clamping rod, 15—spring, 16—tensioning nut, 17—fixing bolt. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, it is limited that "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly including one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Embodiment 1:

[0030] The main structure of this embodiment is as follows: Figures 1 to 4As shown, the turbine disk blade assembly 1 includes a turbine disk in the middle, turbine blades are distributed on the outer edge of the turbine disk, and gear disks are arranged on both sides of the turbine disk. It is characterized in that it includes a positioning assembly for pressing the turbine disk blade assembly 1 and positioning it, the positioning assembly includes a first end tooth clamp 2 on the left, a second end tooth clamp 3 on the right, and a center piece 4 passing through the middle of the turbine disk blade assembly 1, the right side of the first end tooth clamp 2 and the left side of the second end tooth clamp 3 are provided with end teeth, and are respectively highly meshed with the gear disks on both sides of the turbine disk; one end of the center piece 4 is fixedly connected to the first end tooth clamp 2 by a screw 8, and the other end of the center piece 4 is fixedly connected to the second end tooth clamp 3 by a tightening screw 6 passing through the second end tooth clamp 3, the first end tooth clamp 2, the second end tooth clamp 3, the turbine disk blade assembly 1, and the center piece 4 form a whole, and the axis lines of the four are collinear.

[0031] The specific implementation method is that the center piece is fixedly connected to the first end tooth clamp 2 by a screw 8. There is a threaded hole on the first end tooth clamp 2. The tightening screw 6 is a long bolt with a thread diameter of M8. The tightening screw 6 and the center piece 4 are connected together, and the screw 8 is tightly pressed on the second end tooth clamp 3. The first end tooth clamp 2 is engaged with the turbine disk blade assembly through the end teeth with a high degree of meshing. Similarly, the second end tooth clamp 3 is also engaged with this assembly. The first end tooth clamp 2 and the second end tooth clamp 3 are parts that are precisely machined, and their end tooth surfaces, shaft circle surfaces, and top hole surfaces have high verticality and coaxiality. Through such external end tooth engagement and the bolt connection in the middle, the first end tooth clamp 2, the second end tooth clamp 3 and the turbine disk blade assembly form a whole, and the axis lines of the three are collinear.

[0032] When in use, the right side of the first end tooth clamp 2 and the second end tooth clamp 3 are highly meshed with the gear plates on both sides of the turbine disk in the turbine disk blade assembly 1, and the grinding machine is turned on to grind the blade tips of the turbine blades in the turbine disk blade assembly 1.

[0033] Embodiment 2:

[0034] Based on the above embodiment, this embodiment further adds a fixing component, such as Figure 1 As shown, it also includes a fixing assembly for fixing the positioning assembly, the fixing assembly includes a first fixing sleeve 9 and a second fixing sleeve 10, the first end tooth clamping member 2 is embedded in the first fixing sleeve 9, the second end tooth clamping member 3 is embedded in the second fixing sleeve 10, and the first fixing sleeve 9 and the second fixing sleeve 10 are both provided with a clamping ring 11 on the side close to the turbine disk blade assembly 1, and the clamping ring 11 is in close contact with the inner edge of the turbine disk of the turbine disk blade assembly 1. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0035] Embodiment 3:

[0036] Based on the above embodiments, this embodiment further defines the structure of the fixing component, such as Figure 1 As shown, the ends of the first end tooth clamping member 2 and the second end tooth clamping member 3 are provided with four long through grooves extending to the middle of the shaft end, and the middle of the first end tooth clamping member 2 and the second end tooth clamping member 3 are both provided with a clamping cross plate 12, and the clamping cross plate 12 is embedded in the middle of the first end tooth clamping member 2 or the second end tooth clamping member 3 through the long through grooves at the ends of the first end tooth clamping member 2 or the second end tooth clamping member 3, and clamps the first fixing sleeve 9 or the second fixing sleeve 10;

[0037] The middle part of the clamping cross plate 12 embedded in the first end tooth clamping member 2 is penetrated by the center member 4, and the penetration end of the center member 4 is provided with an external thread, which is threadedly connected with a first locking nut 5, and the first locking nut 5 presses the clamping cross plate 12 penetrated by the center member 4;

[0038] The middle part of the clamping cross plate 12 embedded in the second end tooth clamping member 3 is penetrated by the tightening screw 6, and the penetration end of the tightening screw 6 is provided with an external thread, which is threadedly connected to the second locking nut 7, and the second locking nut 7 compresses the clamping cross plate 12 penetrated by the tightening screw 6. The other parts of this embodiment are the same as the above embodiment and are not repeated here.

[0039] Embodiment 4:

[0040] Based on the above embodiments, this embodiment further defines the structure of the fixing component, such as Figure 1 As shown, the long through slots provided at the ends of the first end tooth clamping member 2 and the second end tooth clamping member 3 are symmetrically distributed, and the clamping cross plate 12 is in a "cross" shape. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0041] Embodiment 5:

[0042] Based on the above embodiment, this embodiment further adds a turbine blade clamping member, such as Figure 1 As shown, the outer edges of the first fixing sleeve 9 and the second fixing sleeve 10 are evenly distributed with turbine blade clamps, the number of which is twice the number of turbine blades, and every two turbine blade clamps clamp one turbine blade. The rest of this embodiment is the same as the above embodiment and will not be described in detail.

[0043] Embodiment 6:

[0044] Based on the above embodiment, this embodiment further adds a structure of a turbine blade clamping member, such as Figure 1As shown, the turbine blade clamp also includes a mounting block 13 fixedly connected to the outer edge of the first fixing sleeve 9 or the second fixing sleeve 10, a clamping rod 14 is embedded in the lower part of the mounting block 13, one end of the clamping rod 14 passes through the mounting block 13, a spring 15 is embedded on the clamping rod 14 placed in the mounting block 13, and a tightening nut 16 is threadedly connected to the end of the clamping rod 14 passing through the mounting block 13, and the other end of the clamping rod 14 is tightly pressed on the annular flange of the turbine disk blade assembly 1 by the pressure of the spring 15. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0045] Embodiment 7:

[0046] Based on the above embodiment, this embodiment further adds a structure of a turbine blade clamping member, such as Figure 1 As shown, the mounting block 13 is fixedly connected to the outer edge of the first fixing sleeve 9 or the second fixing sleeve 10 by means of fixing bolts 17. The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0047] It can be understood that the structure of the device for precision grinding of turbine disk blade assemblies according to an embodiment of the present invention, such as the working principles and working processes of components such as the screw 8 and the tightening screw 6, are prior art and are well known to technicians in this field, and will not be described in detail here.

[0048] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A device for precision grinding of a turbine disk blade assembly, the turbine disk blade assembly (1) comprising a turbine disk in the middle, turbine blades distributed on the outer edge of the turbine disk, and gear disks arranged on both sides of the turbine disk, characterized in that: The invention comprises a positioning assembly for pressing a turbine disk blade assembly (1) and positioning the same, the positioning assembly comprising a first end tooth clamp (2) on the left, a second end tooth clamp (3) on the right, and a center piece (4) penetrating the middle of the turbine disk blade assembly (1), the right side of the first end tooth clamp (2) and the left side of the second end tooth clamp (3) are both provided with end teeth, and are respectively highly meshed with gear discs on both sides of the turbine disk; one end of the center piece (4) is fixedly connected to the first end tooth clamp (2) by a screw (8), and the other end of the center piece (4) is fixedly connected to the second end tooth clamp (3) by a tightening screw (6) penetrating the second end tooth clamp (3), the first end tooth clamp (2) and the second end tooth clamp (3) are fixedly connected to the second end tooth clamp (3), and the first end tooth clamp (2) and the second end tooth clamp (3) are fixedly connected to the first end tooth clamp (2) and the second end tooth clamp (3) are fixedly connected to the second end tooth clamp (3) by a tightening screw (6) penetrating the second end tooth clamp (3). The clamping member (3), the turbine disk blade assembly (1), and the center member (4) form an integral body, and the axis lines of the four members are in a colinear line; the fixing member also includes a fixing member for fixing the positioning member, the fixing member includes a first fixing sleeve (9) and a second fixing sleeve (10), the first end tooth clamping member (2) is embedded in the first fixing sleeve (9), the second end tooth clamping member (3) is embedded in the second fixing sleeve (10), and the first fixing sleeve (9) and the second fixing sleeve (10) are both provided with a clamping ring (11) on one side close to the turbine disk blade assembly (1), and the clamping ring (11) is in close contact with the inner edge of the turbine disk of the turbine disk blade assembly (1); the ends of the first end tooth clamping member (2) and the second end tooth clamping member (3) are provided with Four long through grooves extending to the middle of the shaft end, a clamping cross plate (12) is provided in the middle of the first end tooth clamp (2) and the second end tooth clamp (3), the clamping cross plate (12) is embedded in the middle of the first end tooth clamp (2) or the second end tooth clamp (3) through the long through groove at the end of the first end tooth clamp (2) or the second end tooth clamp (3), and clamps the first fixing sleeve (9) or the second fixing sleeve (10); the middle of the clamping cross plate (12) embedded in the first end tooth clamp (2) is penetrated by the center piece (4), the penetration end of the center piece (4) is provided with an external thread, which is threadedly connected to a first locking nut (5), and the first locking nut (5) presses the clamping cross plate (12) penetrated by the center piece (4) ; The middle of the clamping cross disk (12) embedded in the second end tooth clamping member (3) is penetrated by the tightening screw (6), and the penetration end of the tightening screw (6) is provided with an external thread, which is threadedly connected to the second locking nut (7), and the second locking nut (7) compresses the clamping cross disk (12) penetrated by the tightening screw (6); the long through grooves provided at the ends of the first end tooth clamping member (2) and the second end tooth clamping member (3) are symmetrically distributed, and the clamping cross disk (12) is in the shape of a "cross"; the outer edges of the first fixing sleeve (9) and the second fixing sleeve (10) are also evenly distributed with turbine blade clamping members, the number of which is twice the number of turbine blades, and every two turbine blade clamping members clamp one turbine blade;The turbine blade clamping member further comprises a mounting block (13) fixedly connected to the outer edge of the first fixing sleeve (9) or the second fixing sleeve (10), a clamping rod (14) is embedded in the lower part of the mounting block (13), one end of the clamping rod (14) passes through the mounting block (13), a spring (15) is embedded in the clamping rod (14) disposed in the mounting block (13), a tensioning nut (16) is threadedly connected to the end of the clamping rod (14) passing through the mounting block (13), and the other end of the clamping rod (14) is tightly pressed against the annular flange of the turbine disk blade assembly (1) by the pressure of the spring (15). ; 2. A device for precision grinding of turbine disk blade assemblies according to claim 1, characterized in that: The mounting block (13) is fixedly connected to the outer edge of the first fixing sleeve (9) or the second fixing sleeve (10) via fixing bolts (17).

Images