Method and fixture for preliminary processing of longitudinal tree type blade root blade

Abstract

The application discloses a longitudinal tree type blade root type blade pre-processing method and a clamp, and relates to the field of blade processing. The longitudinal tree type blade root type blade pre-processing method comprises the following steps: processing a first positioning and aligning datum and a second positioning and aligning datum on a blade root and a blade crown respectively, wherein the first positioning and aligning datum and the second positioning and aligning datum both comprise a length datum, a width datum and a height datum; rough milling a blade profile, a boss and a blade crown profile line; precisely milling an inner arc surface to obtain a clamping datum surface; positioning and clamping the blade according to the first positioning and aligning datum, the second positioning and aligning datum and the clamping datum surface; precisely milling the blade root; blade shape correction; and precisely milling the blade profile, the boss and the blade crown profile line. The application does not need to pour and remove a square box any more, which is beneficial to save labor cost and will not cause subsequent processing lag, thus being beneficial to reduce cost and improve production efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of blade processing, and particularly relates to a longitudinal-tree type blade root type blade pre-processing method and a clamp. BACKGROUND

[0002] At present, the pre-processing method of the longitudinal-tree type blade root type blade includes the following steps: pouring a low-temperature alloy into a square box, rough and fine milling a blade root tenon, removing the square box, and rough milling a blade profile, a boss and a blade crown profile line, and correcting a profile. In the pre-processing method, the low-temperature property of the low-temperature alloy can reduce thermal deformation, thereby reducing errors in the processing process.

[0003] However, the low-temperature alloy itself has a high cost, which increases the processing cost; the pouring process is complex, and process parameters need to be accurately controlled during pouring, otherwise quality problems are prone to occur; at the same time, special equipment is needed for pouring the square box and removing the square box, which has high requirements for equipment and process; in addition, due to the large size of the blade shape, the temperature control cost and labor cost of pouring the square box and removing the square box are high. SUMMARY

[0004] The present application is to overcome the defects of the prior art, and provides a longitudinal-tree type blade root type blade pre-processing method and a clamp, which can reduce the cost and improve the production efficiency.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] In a first aspect, a longitudinal-tree type blade root type blade pre-processing method is provided, which includes the following steps:

[0007] A first positioning and alignment reference and a second positioning and alignment reference are respectively processed on the blade root and the blade crown, wherein the first positioning and alignment reference and the second positioning and alignment reference each include a length reference, a width reference and a height reference;

[0008] Rough milling a blade profile, a boss and a blade crown profile line;

[0009] Fine milling an inner arc surface to obtain a clamping reference surface;

[0010] Positioning and clamping the blade according to the first positioning and alignment reference, the second positioning and alignment reference and the clamping reference surface;

[0011] Fine milling the blade root;

[0012] Blade correction;

[0013] Fine milling a blade profile, a boss and a blade crown profile line.

[0014] The beneficial effects of the above technical scheme are: the longitudinal tree type blade root type blade pre-processing method no longer pours and withdraws the square box, which is beneficial to save labor cost; and the low-temperature alloy material itself is expensive, the number of poured square boxes is limited, and cannot meet mass production, thereby causing the subsequent processing to lag, and the longitudinal tree type blade root type blade pre-processing method no longer uses low-temperature alloy material to pour the square box, and will not cause the subsequent processing to lag, which is beneficial to reduce the cost and improve the production efficiency; at the same time, the longitudinal tree type blade root type blade pre-processing method processes the blade body first and then processes the blade root, so as to position and process the blade root through the upper section line of the inner arc surface, correct the deviation of the blade root and the surface, and reduce the workload of the correction.

[0015] Further, the length reference of the first positioning and alignment reference is the left end surface of the blade root, and the length reference of the second positioning and alignment reference is the left end surface of the blade crown.

[0016] Further, the two width references of the first positioning and alignment reference are the front end surface and the rear end surface of the blade root, and the two width references of the second positioning and alignment reference are the front end surface and the rear end surface of the blade crown.

[0017] Further, the two height references of the first positioning and alignment reference are the lower end surfaces of the front and rear sides of the blade root, and the height reference of the second positioning and alignment reference is the lower end surface of the blade crown.

[0018] Further, the fine light inner arc surface includes:

[0019] The fine light includes at least two inner arc surfaces with different transverse positions.

[0020] Further, the fine light inner arc surface is at the same transverse position as the fine light outer arc surface.

[0021] Further, before the blade root and the blade crown are processed to form the first positioning and alignment reference and the second positioning and alignment reference, the method further includes the steps of:

[0022] The blade is positioned and clamped by using the three centering pieces and the two clamping pieces.

[0023] In the second aspect, a clamp is provided, which is used in the longitudinal tree type blade root type blade pre-processing method, and the clamp includes a bottom plate, the upper end of the bottom plate is provided with a first positioning block, a plurality of second positioning blocks and a base in sequence along the transverse direction; the right end of the first positioning block is provided with a first positioning surface for abutting the length reference of the first positioning and alignment reference; the front part and the rear part of the first positioning block are respectively provided with a second positioning surface for abutting the two width references of the first positioning and alignment reference; the upper ends of the front and rear sides of the first positioning block are respectively provided with a third positioning surface for abutting the two height references of the first positioning and alignment reference;

[0024] The upper end of the second positioning block is provided with a fourth positioning surface for abutting the clamped reference surface;

[0025] The third positioning block is provided with a fifth positioning surface for abutting the length reference of the second positioning reference.

[0026] The first positioning block abuts the length reference, the width reference and the height reference of the first positioning reference through the first positioning surface, the second positioning surface and the third positioning surface, so as to position the blade root according to the first positioning reference; the second positioning block abuts the clamping reference surface through the fourth positioning surface, so as to position the blade body according to the clamping reference surface when the pressure is applied on the outer arc surface; the third positioning block abuts the length reference, the width reference and the height reference of the second positioning reference through the fifth positioning surface, the sixth positioning surface and the seventh positioning surface, so as to position the blade crown according to the second positioning reference; in summary, the blade can be positioned according to the first positioning reference, the second positioning reference and the clamping reference surface by using the fixture.

[0027] Further, the left end of the third positioning block is provided with a screw rod part which is threadedly connected with the base and whose axis extends in the transverse direction.

[0028] Further, the fixture comprises a profiled pressing plate for clamping the blade in cooperation with the second positioning block, and the profiled pressing plate is detachably connected with the bottom plate.

[0029] The present application has the following beneficial effects:

[0030] The longitudinal tree type blade root blade pre-processing method no longer pours and withdraws the square box, which is beneficial to save labor cost; and the low-temperature alloy material itself is expensive, the number of poured square boxes is limited, and cannot meet mass production, so as to cause the lag of subsequent processing, and the longitudinal tree type blade root blade pre-processing method no longer uses low-temperature alloy material to pour the square box, and will not cause the lag of subsequent processing, which is beneficial to reduce cost and improve production efficiency; at the same time, the longitudinal tree type blade root blade pre-processing method processes the blade body first and then processes the blade root, so as to position and process the blade root through the inner arc surface upper section line, correct the deviation of the blade root and the profile, and reduce the workload of the correction. BRIEF DESCRIPTION OF DRAWINGS

[0031] Hereinafter, the present application will be described in more detail based on the embodiments and with reference to the accompanying drawings. In which:

[0032] Figure 1 The flow chart of the blade pre-processing method in the present application is shown;

[0033] Figure 2A clamping schematic of the blade in the present application is shown.

[0034] Figure 3 A perspective view of Figure 2 is shown.

[0035] Figure 4 A structure schematic of the blade in the present application is shown.

[0036] Figure 5 A bottom view of Figure 4 is shown.

[0037] Figure 6 A structure schematic of the clamp in the present application is shown.

[0038] Figure 7 A top view of Figure 6 is shown.

[0039] Figure 8 A perspective view of Figure 6 is shown.

[0040] In the drawings, the same parts are designated by the same reference numerals. The drawings are not drawn to scale.

[0041] Reference numerals:

[0042] 1, blade; 101, first length reference; 102, first width reference; 103, first height reference; 104, second length reference; 105, second width reference; 106, second height reference; 107, clamping reference surface; 2, first positioning block; 201, first positioning surface; 202, second positioning surface; 203, third positioning surface; 3, profile pressing plate; 301, eighth positioning surface; 4, bottom plate; 5, base; 501, sixth positioning surface; 502, seventh positioning surface; 6, third positioning block; 601, fifth positioning surface; 7, second positioning block; 701, fourth positioning surface; 8, rotating handle. DETAILED DESCRIPTION

[0043] The present application will be further described below in conjunction with the drawings.

[0044] The present application provides a longitudinal tree type blade root type blade pre-processing method, as shown in Figures 1-5 , which comprises the following steps:

[0045] A first positioning reference and a second positioning reference are respectively machined on the blade root and the blade crown, wherein the first positioning reference and the second positioning reference each comprise a length reference, a width reference and a height reference;

[0046] Roughly milling the profile, the boss and the blade crown profile line;

[0047] The inner arc surface is precisely milled to obtain the clamping reference surface 107;

[0048] The blade 1 is positioned according to the first positioning reference, the second positioning reference and the clamping reference surface 107;

[0049] The blade root is precisely milled;

[0050] The blade 1 is profiled;

[0051] The airfoil, the boss and the shroud profile are precisely milled.

[0052] It can be understood that the longitudinal tree type blade root blade pre-processing method no longer pours the square box and retreats the square box, which is beneficial to save labor cost (labor cost, forklift transfer cost and water burning electricity cost); and the low-temperature alloy material itself is expensive, and the number of poured square boxes is limited, which cannot meet the mass production, thereby causing the subsequent processing to lag, and the longitudinal tree type blade root blade pre-processing method no longer uses the low-temperature alloy material to pour the square box, and will not cause the subsequent processing to lag, which is beneficial to reduce the cost and improve the production efficiency; at the same time, the longitudinal tree type blade root blade pre-processing method processes the blade body first and then processes the blade root, so as to position and process the blade root through the inner arc surface upper cross-sectional profile, correct the deviation of the blade root and the profile, and reduce the workload of the profile.

[0053] It should be noted that when the blade root is precisely milled, the clamp positions and installs the blade 1 according to the first positioning reference, the second positioning reference and the clamping reference surface 107, and adopts the mode of tightly holding the blade 1 at both ends of the profile pressing plate 3 to clamp the blade 1, so as to avoid the displacement of the blade root in the processing process due to the large cutting force of the forming tool.

[0054] It should be further noted that if the rough machining machine tool cannot meet the process requirement size, the method of marking the reference size can be adopted to check and adjust the machine tool X stroke to meet the machining condition.

[0055] In one embodiment, the length reference of the first positioning reference is the first length reference 101, specifically the left end surface of the blade root; and the length reference of the second positioning reference is the second length reference 104, specifically the left end surface of the shroud.

[0056] In one embodiment, the width reference of the first positioning reference is the first width reference 102, and the two first width references 102 are respectively the front end surface and the rear end surface of the blade root; and the width reference of the second positioning reference is the second width reference 105, and the two second width references 105 are respectively the front end surface and the rear end surface of the shroud.

[0057] In one embodiment, the height reference of the first positioning alignment reference is the first height reference 103, which is the lower end surface of the front and rear sides of the blade root; and the height reference of the second positioning alignment reference is the second height reference 106, which is the lower end surface of the blade crown.

[0058] In one embodiment, the fine inner arc surface includes:

[0059] The fine inner arc surface includes at least two transversely different positions.

[0060] It can be understood that the blade 1 is positioned and installed in multiple positions, thereby facilitating the improvement of the positioning and clamping accuracy of the blade 1.

[0061] In one embodiment, the fine inner arc surface is at the same transverse position as the fine outer arc surface.

[0062] It can be understood that the inner arc surface and the outer arc surface at the same transverse position can be used for positioning and clamping, thereby facilitating the improvement of the positioning and clamping accuracy of the blade 1.

[0063] In one embodiment, before the first positioning alignment reference and the second positioning alignment reference are machined on the blade root and the blade crown respectively, the method further includes the following steps:

[0064] The blade 1 is positioned and clamped by the three-point piece and the two clamping pieces.

[0065] Specifically, the positioning and clamping of the blade 1 by the three-point piece and the two clamping pieces includes the following steps:

[0066] The three-point piece is respectively inserted into the two top hole of the blade root and the top hole of the blade crown;

[0067] The two clamping pieces are clamped on the blade body.

[0068] The transverse positions of the two clamping pieces are different from the transverse positions of the blade profile, the boss, the blade crown profile, and the clamping reference surface 107.

[0069] It can be understood that the three-point and two-clamping method can ensure the machining rigidity of the entire blade body during rough milling of the blade profile, the boss, and the blade crown profile.

[0070] It should be noted that because of the interference problem of the clamping piece when machining the two end references of the blade 1, in the front sequence machining method of the longitudinal blade root type blade, the first positioning alignment reference and the second positioning alignment reference are machined on the blade root and the blade crown respectively, and then the blade profile, the boss, and the blade crown profile are rough milled.

[0071] It should be noted that the two top holes are transversely arranged at the right end of the blade root and are respectively located on the front and rear sides, and the other top hole is transversely arranged at the left end of the blade crown.

[0072] As Figures 2-7As shown, the present application also provides a clamp for the longitudinal tree type blade root blade pre-processing method, the clamp comprising a base plate 4, the upper end of the base plate 4 is provided with a first positioning block 2, a plurality of second positioning blocks 7 and a base 5 in sequence along the transverse direction; the right end of the first positioning block 2 is provided with a first positioning surface 201 for fitting a length reference in the first positioning reference; the front and rear parts of the first positioning block 2 are respectively provided with a second positioning surface 202 for fitting two width references in the first positioning reference; the upper ends of the front and rear sides of the first positioning block 2 are respectively provided with a third positioning surface 203 for fitting two height references in the first positioning reference;

[0073] The upper end of the second positioning block 7 is provided with a fourth positioning surface 701 for fitting the clamping reference surface 107;

[0074] The base 5 is provided with a groove along the transverse direction, the left end of the groove is provided with a third positioning block 6, the right end of the third positioning block 6 is provided with a fifth positioning surface 601 for fitting a length reference in the second positioning reference; the front and rear sides of the groove are respectively provided with a sixth positioning surface 501 for fitting two width references in the second positioning reference; the lower end of the groove is provided with a seventh positioning surface 502 for fitting a height reference in the second positioning reference.

[0075] It can be understood that the first positioning block 2 fits the length reference, the width reference and the height reference of the first positioning reference through the first positioning surface 201, the second positioning surface 202 and the third positioning surface 203 respectively, so as to position the clamped blade root according to the first positioning reference; the second positioning block 7 fits the clamping reference surface 107 through the fourth positioning surface 701, and when the pressure is applied to the convex surface, the clamped blade body can be positioned according to the clamping reference surface 107; the third positioning block 6 fits the length reference, the width reference and the height reference of the second positioning reference through the fifth positioning surface 601, the sixth positioning surface 501 and the seventh positioning surface 502 respectively, so as to position the clamped blade crown according to the second positioning reference; in summary, the clamp can position the clamped blade 1 according to the first positioning reference, the second positioning reference and the clamping reference surface 107.

[0076] Specifically, when the clamp positions the clamped blade 1, the first positioning surface 201 fits the left end surface of the blade root, the two second positioning surfaces 202 respectively fit the front end surface and the rear end surface of the blade root, the two third positioning surfaces 203 respectively fit the lower end surfaces of the front and rear sides of the blade root, the fourth positioning surface 701 fits the convex surface of the blade crown, the fifth positioning surface 601 fits the left end surface of the blade crown, the two sixth positioning surfaces 501 respectively fit the front end surface and the rear end surface of the blade crown, and the seventh positioning surface 502 respectively fits the lower end surface of the blade crown.

[0077] In one embodiment, in order to solve the problem of vibration during rough milling of the blade profile and the boss, the left end of the third positioning block 6 is provided with a screw rod part which is threadedly connected with the base 5 and has an axis extending in the transverse direction, so that the right end of the third positioning block 6, i.e. the driven tailstock, is tightened against the left end of the blade crown by rotating the screw rod part, thereby enhancing the rigidity of the blade crown during machining; in addition, the machining is performed from the blade crown to the blade root.

[0078] It should be noted that the left end of the screw rod part can be provided with a rotating handle 8, and the third positioning block 6 can act on the tailstock hole of the left end of the blade crown.

[0079] In one embodiment, the fixture comprises a profiled pressing plate 3 for clamping the blade 1 in cooperation with the second positioning block 7, and the profiled pressing plate 3 is bolted to the bottom plate 4.

[0080] Specifically, the lower end of the profiled pressing plate 3 can be provided with an eighth positioning surface 301 for abutting against the finished outer arc surface, so that when the profiled pressing plate 3 is fixed to the bottom plate 4, the inner arc surface and the outer arc surface at the finished position abut against the fourth positioning surface 701 and the eighth positioning surface 301 respectively, thereby facilitating high-precision positioning and clamping of the blade 1.

[0081] In the description of the present application, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0082] Although the present application is described herein with reference to particular embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present application. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, without departing from the spirit and scope of the present application as defined in the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from the original claims described. It should also be understood that features described in connection with individual embodiments can be used in other described embodiments.

Claims

1. A method for pre-processing of leaf roots in a longitudinal tree-like structure, characterized in that, Includes the following steps: The first positioning and alignment reference and the second positioning and alignment reference are respectively processed at the leaf root and the leaf crown. The first positioning and alignment reference and the second positioning and alignment reference both include a length reference, a width reference and a height reference. Rough milling of blade profile, boss, and blade crown profile; The inner arc surface is polished to obtain the clamping reference surface (107); Position and clamp the blade (1) according to the first positioning and alignment datum, the second positioning and alignment datum and the clamping datum surface (107); Precision milling of blade roots; Blade (1) Shaping; Precision milling of blade profiles, bosses, and blade crown lines; The finely polished inner arc surface includes: The surface must have at least two inner arc surfaces with different lateral positions. Before processing the first and second positioning and alignment references at the leaf root and leaf crown respectively, the following steps are also included: The blade is positioned and clamped using three center points and two clamping parts (1), wherein the two clamping parts are clamped to the blade body.

2. The pre-processing method for longitudinal tree-type leaf roots according to claim 1, characterized in that, The length reference for the first positioning and alignment reference is the left end face of the leaf root, and the length reference for the second positioning and alignment reference is the left end face of the leaf crown.

3. The pre-processing method for longitudinal tree-type leaf roots according to claim 1, characterized in that, The two width references for the first positioning and alignment reference are the front and rear faces of the leaf root, respectively, and the two width references for the second positioning and alignment reference are the front and rear faces of the leaf crown.

4. The pre-processing method for longitudinal tree-type leaf roots according to claim 1, characterized in that, The two height references for the first positioning and alignment reference are the lower end faces of the front and rear sides of the leaf root, and the height reference for the second positioning and alignment reference is the lower end face of the leaf crown.

5. The pre-processing method for longitudinal tree-type leaf roots according to claim 1, characterized in that, When finishing the inner arc surface, finish the outer arc surface at the same lateral position.

6. A clamp, characterized in that, The fixture is used in the pre-processing method for the longitudinal tree-shaped leaf root type blade according to any one of claims 1-5. The fixture includes a base plate (4). The upper end of the base plate (4) is provided with a first positioning block (2), a plurality of second positioning blocks (7) and a base (5) in a transverse direction. The right end of the first positioning block (2) is provided with a first positioning surface (201) for fitting the length reference in the first positioning and alignment reference. The front and rear parts of the first positioning block (2) are respectively provided with second positioning surfaces (202) for fitting the two width references in the first positioning and alignment reference. The upper ends of the front and rear sides of the first positioning block (2) are respectively provided with third positioning surfaces (203) for fitting the two height references in the first positioning and alignment reference. The upper end of the second positioning block (7) is provided with a fourth positioning surface (701) for fitting the clamping reference surface (107). The base (5) is provided with a groove along the horizontal direction. A third positioning block (6) is provided at the left end of the groove. A fifth positioning surface (601) for fitting the length reference in the second positioning and alignment reference is provided at the right end of the third positioning block (6). A sixth positioning surface (501) for fitting the two width references in the second positioning and alignment reference is provided at the front and rear sides of the groove. A seventh positioning surface (502) for fitting the height reference in the second positioning and alignment reference is provided at the lower end of the groove.

7. The clamp according to claim 6, characterized in that, The left end of the third positioning block (6) is provided with a screw part that is threadedly connected to the base (5) and whose axis extends laterally.

8. The clamp according to claim 6, characterized in that, The fixture includes a profiled pressure plate (3) for clamping the blade (1) in conjunction with the second positioning block (7), and the profiled pressure plate (3) is detachably connected to the base plate (4).

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