Split type rear bearing casing and welding manufacturing method thereof

Abstract

The invention provides a split type rear bearing casing and a welding manufacturing method thereof. The welding manufacturing method is used for manufacturing the split type rear bearing casing. The welding manufacturing method for the split type rear force bearing casing comprises the steps that the blade profile deflection angle of a welding boss is calculated; blade profile machining is conducted on the welding boss according to the blade profile deflection angle; the supporting plate body is welded and fixed to the welding boss, so that welding and fixing of the supporting plate piece and the inner ring are achieved; and the outer ring part is subjected to machining compensation according to the blade profile deflection angle, so that it is guaranteed that the spliced outer ring and the inner ring are of an annular structure which is coaxially distributed. According to the welding manufacturing method for the split type rear force-bearing casing, the split position of the split type rear force-bearing casing is set, in the welding manufacturing process, the blade profile deflection angle is calculated, blade profile machining is conducted on a welding boss according to the blade profile deflection angle, and a supporting plate piece is supplemented, so that the misalignment problem on a welding seam can be effectively avoided, and the welding quality of the split type rear force-bearing casing is improved. And safe operation of the aero-engine is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine components, in particular to a split rear load-bearing casing and a welding manufacturing method thereof. BACKGROUND

[0002] The turbine rear load-bearing casing (hereinafter referred to as "rear casing") of a high-bypass-ratio aero-engine belongs to a part of the load-bearing frame of the engine. On the one hand, the rear casing guides the gas from the low-pressure turbine to the tail jet section outside the engine, and on the other hand, the rear casing fixes the engine fulcrum bearing to transmit the rotor load to the engine mounting section. The rear casing generally includes an outer ring, an inner ring, a plurality of support plates, lugs, a conical wall and the like. The flow passage formed by the outer ring and the inner ring guides the high-temperature gas into the tail jet section, and the outer ring and the inner ring are connected by the plurality of support plates. The inner ring is connected with the rear fulcrum bearing seat to transmit the load from the bearing seat to the support plates, the outer ring, the lugs and the entire load-bearing system of the engine. The support plates between the inner and outer rings are generally hollow thin-walled blade-shaped structures, and oil pipes and air pipes are arranged inside the support plates. The support plates not only bear the load, but also isolate the oil pipes and the air pipes from high temperatures.

[0003] The manufacturing method of the rear casing generally has two process routes, i.e. integral casting forming and split casting plus welding. The integral casting forming method refers to that the outer ring, the inner ring and the support plates are integrally cast in one piece. The split casting plus welding method divides the integral casing into a plurality of castings. The individual castings have low production cost and high qualification rate, and after machining, the individual castings are welded into an integral casing. For a small and medium-sized load-bearing casing, the integral casting process is relatively easy to implement, and the structure has high reliability. However, when the outer diameter of the rear casing exceeds 1.5 m, the weight of the integral casting with the casting system is extremely large, which requires high equipment capacity. In addition, due to the too small wall thickness and the too large size, the integral wax mold is prone to strength problems, and the integral casting process is prone to fire running and steel leakage, resulting in too low integral part yield. The split casting divides the casing into structures that are easy to cast and then welds them into one piece, which is a highly feasible way for manufacturing large-sized rear casings.

[0004] However, when the split casting method is used to manufacture large-sized rear casings, the casing quality and reliability are easily affected by the large casting contour error, large welding deformation and unstable welding process quality. Due to the influence of the casting contour size, repair welding and heat treatment, the split structure of the casing is prone to cause large misalignment at the welding seam between the inner ring and the support plate, and stress concentration is easily formed near the welding seam in the working state, which is harmful to the safe operation of the engine. SUMMARY

[0005] The present application aims to provide a split rear load-bearing casing welding manufacturing method, which can improve the technical problem that the misalignment of the welding seam is prone to occur when the split casting and welding method is used to manufacture large-sized rear load-bearing casings in the prior art, thereby causing the rear load-bearing casing to easily form stress concentration.

[0006] The present application also aims to provide a split rear force casing which can improve the problem of weld edge deviation in the prior art when a large-size split rear force casing is manufactured by casting and welding, thereby causing the split rear force casing to form stress concentration.

[0007] Embodiments of the present application can be implemented in the following manner:

[0008] A split rear force casing welding manufacturing method is used to manufacture a split rear force casing, the split rear force casing comprising an inner ring and a plurality of support plate pieces; the outer periphery of the inner ring is provided with a plurality of welding bosses; the support plate piece comprises a support plate body and an outer ring part fixedly connected to the support plate body, and the support plate body is connected to the welding boss; the outer ring part of the plurality of support plate pieces is used to splice to form an outer ring of the split rear force casing; the split rear force casing welding manufacturing method comprises:

[0009] calculating a blade profile deflection angle of the welding boss;

[0010] performing blade profile machining on the welding boss according to the blade profile deflection angle;

[0011] welding and fixing the support plate body on the welding boss to realize welding and fixing of the support plate piece and the inner ring;

[0012] performing machining compensation on the outer ring part according to the blade profile deflection angle to ensure that the spliced outer ring is in a coaxial ring structure with the inner ring.

[0013] Optionally, the welding boss comprises a casting blade profile part and a casting allowance part, and the casting allowance part is used for welding with the support plate body; the step of calculating the blade profile deflection angle of the welding boss comprises:

[0014] obtaining a first cross-sectional profile of the casting allowance part;

[0015] obtaining a second cross-sectional profile of the casting blade profile part;

[0016] fitting the first cross-sectional profile, the second cross-sectional profile, and a theoretical blade profile to obtain the blade profile deflection angle.

[0017] Optionally, the step of fitting the first cross-sectional profile, the second cross-sectional profile, and the theoretical blade profile to obtain the blade profile deflection angle comprises:

[0018] calculating according to the following formula, and taking the α angle when the minimum value is the blade profile deflection angle:

[0019]

[0020] wherein P ai is the blade profile coordinate after the i-th section of the first section profile is deflected by the angle of the blade profile deflection α; Q ai is the blade profile coordinate of the i-th section of the first section profile; P bi is the blade profile coordinate after the i-th section of the second section profile is deflected by the angle of the blade profile deflection α; Q bi is the blade profile coordinate of the i-th section of the second section profile; and n is a positive integer.

[0021] Optionally, the step of profiling the welding boss according to the angle of the blade profile deflection comprises:

[0022] if the angle of the blade profile deflection is greater than or equal to a first preset value, the profiling of the welding boss of the inner ring is stopped;

[0023] if the angle of the blade profile deflection is less than the first preset value, if the angle of the blade profile deflection is greater than a second preset value, a profiling blade profile is formed after the theoretical blade profile is deflected by the angle of the blade profile deflection, and the welding boss corresponding to the angle of the blade profile deflection is profiled according to the profiling blade profile; if the angle of the blade profile deflection is less than or equal to the second preset value, the welding boss corresponding to the angle of the blade profile deflection is profiled according to the theoretical blade profile;

[0024] wherein the first preset value is greater than the second preset value.

[0025] Optionally, after the step of calculating the angle of the blade profile deflection of the welding boss, the split rear thrust casing welding manufacturing method further comprises marking the welding boss corresponding to the angle of the blade profile deflection greater than or equal to a third preset value.

[0026] The step of profiling the outer ring portion according to the angle of the blade profile deflection comprises:

[0027] profiling the outer ring portion to be welded to the support plate member having the marked welding boss;

[0028] wherein the third preset value is less than the second preset value.

[0029] Optionally, the support plate member comprises a lug support plate member and a non-lug support plate member; before the step of welding and fixing the support plate body on the welding boss, the split rear thrust casing welding manufacturing method further comprises: machining the support plate member; the step of machining the support plate member comprises:

[0030] Machining a welding end of the branch plate body for welding with the welding boss;

[0031] Machining two ends of the outer ring part of the lug branch plate piece in the circumferential direction.

[0032] Optionally, the split rear load-bearing casing welding manufacturing method further comprises a step of welding to form the outer ring; the outer ring comprises a circumferentially closed annular piece, a plurality of the lug branch plate pieces are arranged adjacent to each other, and a plurality of the non-lug branch plate pieces are arranged adjacent to each other; the step of welding to form the outer ring comprises a step of splicing the outer ring parts of the plurality of branch plate pieces to form the annular piece; the step of splicing the outer ring parts of the plurality of branch plate pieces to form the annular piece comprises:

[0033] The outer ring parts of the adjacent lug branch plate pieces are welded and fixed to each other;

[0034] Obtaining the gap size between the adjacent lug branch plate pieces and the non-lug branch plate piece, and manufacturing a first outer ring plate according to the gap size;

[0035] Obtaining the gap size between the adjacent two non-lug branch plate pieces, and manufacturing a second outer ring plate according to the gap size;

[0036] Welding and fixing the first outer ring plate between the adjacent lug branch plate pieces and the non-lug branch plate piece, and welding and fixing the second outer ring plate between the adjacent two non-lug branch plate pieces to splice to form the circumferentially closed annular piece.

[0037] Optionally, the outer ring further comprises a front mounting edge and a rear mounting edge arranged at the axial two ends of the annular piece; before the step of splicing the outer ring parts of the plurality of branch plate pieces to form the annular piece, the step of welding to form the outer ring further comprises:

[0038] Welding and positioning the front mounting edge and the rear mounting edge to the outer ring parts of the plurality of branch plate pieces by spot welding respectively; wherein the mounting edge and the rear mounting edge are respectively located at the axial two sides of the outer ring part;

[0039] After the step of splicing the outer ring parts of the plurality of branch plate pieces to form the annular piece, the step of welding to form the outer ring further comprises:

[0040] Connecting and fixing the front mounting edge, the rear mounting edge, the outer ring part, the first outer ring plate, and the second outer ring plate by electron beam welding.

[0041] A split rear load-bearing casing obtained by the split rear load-bearing casing welding manufacturing method described above.

[0042] The split rear force casing and the welding manufacturing method thereof have the following beneficial effects:

[0043] The split rear force casing welding manufacturing method is used for manufacturing the split rear force casing, the split rear force casing comprises an inner ring and a plurality of support plate pieces, and the outer periphery of the inner ring is provided with a plurality of welding bosses. The support plate piece comprises a support plate body and an outer ring part fixedly connected to the support plate body, and the support plate body is connected with the welding boss; the outer ring parts of the plurality of support plate pieces are used for splicing to form an outer ring of the split rear force casing. The split rear force casing welding manufacturing method comprises the following steps: calculating a blade type deflection angle of the welding boss; performing blade type processing on the welding boss according to the blade type deflection angle; welding and fixing the support plate body on the welding boss to realize welding and fixing of the support plate piece and the inner ring; and performing processing compensation on the outer ring part according to the blade type deflection angle to ensure that the spliced outer ring is in a coaxial ring structure with the inner ring. The split rear force casing welding manufacturing method sets the split position of the split rear force casing, calculates the blade type deflection angle, performs blade type processing on the welding boss according to the blade type deflection angle, and performs compensation on the support plate piece, so that the misalignment problem of the welding seam can be effectively avoided, and the stress concentration problem of the rear force casing formed by welding can be avoided, thereby ensuring the safe operation of the aero-engine.

[0044] The split rear force casing is obtained by using the split rear force casing welding manufacturing method, and therefore has the beneficial effects that the misalignment problem of the welding seam can be effectively avoided, and the stress concentration problem of the rear force casing formed by welding can be avoided, thereby ensuring the safe operation of the aero-engine. BRIEF DESCRIPTION OF DRAWINGS

[0045] The above features and advantages of the present application can be better understood by reading the detailed description of embodiments of the present application in conjunction with the following drawings, in which: in the drawings, components are not necessarily drawn to scale and components having similar related functions or features can have the same or similar reference numerals.

[0046] Figure 1 Fig. 1 shows a schematic diagram of the overall structure of a split rear force casing according to an aspect of the present application;

[0047] Figure 2 Fig. 2 shows a schematic diagram of the structure of a lug support plate piece according to an aspect of the present application;

[0048] Figure 3 Fig. 3 shows a schematic diagram of the structure of a non-lug support plate piece according to an aspect of the present application;

[0049] Figure 4A structural diagram of an inner ring is shown according to an aspect of the present application;

[0050] Figure 5 A sectional structural diagram of a welding boss of an inner ring in a split rear thrust casing is shown according to an aspect of the present application;

[0051] Figure 6 A blade profile correspondence diagram of a first cross-sectional profile, a theoretical blade profile and a deflected blade profile is shown according to an aspect of the present application;

[0052] Figure 7 A welding position diagram of a front mounting edge and a rear mounting edge welded with an outer ring part is shown according to an aspect of the present application;

[0053] Figure 8 A structural diagram formed after step S51 is executed is shown according to an aspect of the present application;

[0054] Figure 9 A partial structural diagram of the structure formed after step S51 is executed from another perspective is shown according to an aspect of the present application.

[0055] Reference signs:

[0056] 100 - split rear thrust casing; 110 - inner ring; 111 - inner ring body; 112 - welding boss; 113 - cast blade profile part; 114 - cast allowance part; 115 - blade inner surface; 116 - blade outer surface; 117 - end surface; 120 - support plate part; 121 - lug support plate part; 122 - non-lug support plate part; 123 - support plate body; 124 - outer ring part; 130 - outer ring; 131 - front mounting edge; 132 - rear mounting edge; 133 - first outer ring plate; 134 - second outer ring plate. DETAILED DESCRIPTION

[0057] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are merely exemplary and should not be understood as limiting the scope of protection of the present application.

[0058] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer", "vertical" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the present application is usually placed, and therefore should not be understood as indicating or implying that the device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0059] It should be noted that the terms "first", "second" and the like in the description and in the claims are used only for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of use in either order.

[0060] In the description of the application, it should also be noted that unless otherwise explicitly specified or limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, it can be integrally connected, or it can be detachably connected; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, or the connection between two elements, etc. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0061] Figure 1 The overall structure diagram of the split rear force casing 100 provided by the embodiment is shown in Figure 2 The structure diagram of the lug support plate member 121 provided by the embodiment is shown in Figure 3 The structure diagram of the non-lug support plate member 122 provided by the embodiment is shown in Figure 4 The structure diagram of the inner ring 110 provided by the embodiment is shown in Figures 1-4 The embodiment provides a split rear force casing welding manufacturing method, which can be used to manufacture the split rear force casing 100 as shown in Figure 1 Accordingly, the embodiment also provides a split rear force casing 100, which is manufactured by the split rear force casing welding manufacturing method described above.

[0062] It should be noted that the split rear force casing 100 as shown in Figure 1 has a structure of 14 support plate members, that is, the number of support plate members 120 in the split rear force casing 100 is 14, and among them, the number of lug support plate members 121 is three, and the number of non-lug support plate members 122 is eleven. In the following, the structure of the split rear force casing 100 as shown in Figure 1 will be taken as an example to explain the structure of the split rear force casing 100 and the specific steps of the split rear force casing welding manufacturing method. It can be understood that in some other embodiments, the number of support plate members 120 and the number of lug support plate members 121 and the number of non-lug support plate members 122 can be adjusted and set according to requirements.

[0063] The split rear force casing welding manufacturing method provided by the embodiment and the structure of the split rear force casing 100 manufactured accordingly will be described below:

[0064] Please continue to refer to Figures 1-4 The split rear force casing 100 manufacturing method provided by the embodiment includes:

[0065] S01: Calculate the blade profile deflection angle of the welding boss 112.

[0066] Figure 5 A cross-sectional structure schematic diagram at the welding boss 112 of the inner ring 110 in the split rear thrust casing 100 is shown. As shown in the figure, Figure 4 and Figure 5 The inner ring 110 includes an inner ring body 111 and a plurality of welding bosses 112 evenly distributed around the circumference of the inner ring body 111, and accordingly, the number of welding bosses 112 is fourteen in this embodiment. The inner ring 110 is integrally cast into shape.

[0067] The welding boss 112 includes a cast blade profile part 113 and a cast excess part 114 for welding with the support plate body 123. Specifically, the lower end of the cast blade profile part 113 is connected to the outer circumferential surface of the inner ring body 111, and the cast excess part 114 is located at the top of the cast blade profile part 113, that is, the lower end of the support plate body 123 is welded through the cast excess part 114 during welding, thereby forming a blade part connecting the inner ring body 111 and the outer ring 130, and at the same time, the cast excess part 114 needs to be processed before welding to remove the excess.

[0068] The steps of calculating the blade profile deflection angle of the welding boss 112 include:

[0069] S11: Obtain the cross-sectional profile of the cast excess part 114 as a first cross-sectional profile.

[0070] The positions of each point on a certain cross section of the cast excess part 114 are measured, thereby obtaining the first cross-sectional profile corresponding to the cross section, for examplethe cross-sectional profile at section A. Figure 5

[0071] S12: Obtain the cross-sectional profile of the cast blade profile part 113 as a second cross-sectional profile.

[0072] The positions of each point on a certain cross section of the cast blade profile part 113 are measured, thereby obtaining the second cross-sectional profile corresponding to the cross section, for examplethe cross-sectional profile at section B. Figure 5

[0073] S13: Fit the blade profile deflection angle according to the first cross-sectional profile, the second cross-sectional profile, and the theoretical blade profile.

[0074] As Figure 6 a blade profile correspondence diagram of the first cross-sectional profile, the theoretical blade profile, and the deflected blade profile in this embodiment is shown, wherein the deflected blade profile is the blade profile obtained after the theoretical blade profile is deflected by an angle α. Please refer to Figures 4-6 in this embodiment, the calculation can be performed according to the following formula, and The angle a at the minimum value is the deflection angle of the blade profile:

[0075]

[0076] wherein P ai is the blade coordinate of the i-th section after the deflection of the angle a on the theoretical blade profile a2 of the first section profile a1; Q ai is the blade coordinate of the i-th section on the first section profile a1; P bi is the blade coordinate of the i-th section after the deflection of the angle a on the theoretical blade profile of the second section profile; Q bi is the blade coordinate of the i-th section on the second section profile; and n is a positive integer.

[0077] Specifically, as Figure 6 shown, the blade coordinates on the sections S1-Sn are measured along the length of the blade profile, thereby obtaining n blade coordinates, the blade coordinate on the first section profile is Q ai wherein i is a positive integer from 1 to n; and the blade coordinate point on the second section profile is Q bi wherein i is a positive integer from 1 to n. Optionally, n can be any positive integer between 15 and 30, for example, the specific value of n can be set to 15, 20, 25 or 30.

[0078] P ai is the blade coordinate of the i-th section after the deflection of the angle a on the theoretical blade profile a2 of the first section profile a1, the blade profile after the deflection of the angle a of the theoretical blade profile a2 of the first section profile a1 is the deflected blade profile a3 as Figure 6 shown, thus P ai can also be regarded as the blade coordinate of the i-th section on the deflected blade profile a3. Q bi Similarly, it is also the blade coordinate of the i-th section on the deflected blade profile corresponding to the section profile.

[0079] |P ai Q ai | 2 represents the square of the distance between the point P on the first section profile a1 and the point Q on the deflected blade profile a3 at the same Si section. |P bi Q bi | 2 Similarly.

[0080] It should be noted that when measuring the coordinates of the points according to the coordinate system in Figure 6 , the X coordinate value is ignored.

[0081] The specific process of calculating the deflection angle a of the blade profile according to the above formula is that a is allowed to be calculated within 0°-1° with a step of 1', and then the minimum The value of α at the time is taken as the blade profile deflection angle.

[0082] Since there are fourteen welding bosses 112 in the present embodiment, step S01 is performed independently for each welding boss 112 to obtain a blade profile deflection angle corresponding to each welding boss 112.

[0083] S02: Blade profiling is performed on the welding boss 112 according to the blade profile deflection angle.

[0084] The step of blade profiling the welding boss 112 according to the blade profile deflection angle α includes:

[0085] S21: Determine whether the welding boss 112 is qualified according to the value of the blade profile deflection angle α.

[0086] If the value of the blade profile deflection angle α is greater than or equal to a first preset value, it means that the casting deviation of the welding boss 112 is greater than the acceptable range, which can be regarded as unqualified, and the processing should be stopped. Alternatively, the first preset value is 0.6°.

[0087] S22: In the case where the blade profile deflection angle is less than the first preset value, determine the size relationship between the blade profile deflection angle and a second preset value.

[0088] If the blade profile deflection angle α is greater than the second preset value, the theoretical blade profile is deflected by α to obtain a processed blade profile (i.e., the deflected blade profile mentioned above is taken as the blade profile obtained by processing the welding boss), and the welding boss 112 corresponding to the blade profile deflection angle is processed according to the blade profile. If the blade profile deflection angle α is less than or equal to the second preset value, the welding boss 112 corresponding to the blade profile deflection angle α is processed according to the theoretical blade profile. Alternatively, the second preset value is a value less than the first preset value, and in the present embodiment, the second preset value is set to 0.2°.

[0089] Specifically, when processing the welding boss 112, the end face 117, the blade inner surface 115, and the blade outer surface 116 of the casting allowance portion 114 need to be processed.

[0090] S03: Weld and fix the support plate body 123 on the welding boss 112 to realize the welding and fixing of the support plate 120 and the inner ring 110.

[0091] The support plate body 123 is welded one-to-one on the welding boss 112. In the present embodiment, the support plate 120 is a cast structure, so before welding in step S03, the parts of the support plate 120 that need to be welded also need to be machined.

[0092] Optionally, in the embodiment, the support plate member 120 comprises lug support plate members 121 and non-lug support plate members 122, a plurality of lug support plate members 121 are arranged adjacent along the circumference of the inner ring 110, and a plurality of non-lug support plate members 122 are arranged adjacent along the circumference of the inner ring 110. The outer ring portions 124 of adjacent lug support plate members 121 are welded and fixed to each other, and the outer ring plate is used to fill and connect between adjacent two non-lug support plate members 122 and between adjacent lug support plate members 121 and non-lug support plate members 122.

[0093] The step of machining the positions on the support plate member 120 that need to be welded specifically comprises:

[0094] The lower end welding position of the support plate body 123 in the non-lug support plate member 122 and the circumferential ends of the outer ring portion 124 are machined, and the lower end welding position of the support plate body 123 in the lug support plate member 121 is machined. It should be noted that the machining process of the lower end welding position of the support plate body 123 is similar to the machining of the casting allowance portion 114, and the end face and the inner and outer circumferential surface need to be machined.

[0095] Further, after the step S03 of welding and fixing the support plate member 120 to the inner ring 110 is performed, the welds at the welding positions of the support plate member 120 and the inner ring 110 can be inspected to ensure the welding quality. Optionally, X-ray and fluorescence inspection and other methods can be used to check the welding quality of the welding positions.

[0096] S04: Machining compensation is performed on the outer ring portion 124 according to the blade type deflection angle, so that the outer ring 130 formed by splicing later has a coaxial ring structure with the inner ring 110.

[0097] Since the welding boss 112 has a blade type profile that is obtained by deflecting a theoretical blade type profile by an angle a when the blade type is machined, after the support plate body 123 is welded and fixed to the welding boss 112, the support plate body 123 will have a certain deflection compared to the theoretical position. Correspondingly, the outer ring portion 124 fixedly connected to the support plate body 123 will also have a certain deflection, so machining compensation needs to be performed on the outer ring portion 124 according to the blade type deflection angle to adjust the axial position of the outer ring portion 124 after splicing.

[0098] Specifically, the step of machining compensation on the outer ring portion 124 according to the blade type deflection angle comprises:

[0099] The outer ring part 124 of the support plate 120 to be welded on the welding boss 112 corresponding to the leaf type deflection angle greater than or equal to the third preset value is machined. Alternatively, the welding boss 112 corresponding to the leaf type deflection angle greater than or equal to the third preset value can be marked during the execution of step S01, so that the outer ring part 124 of the support plate 120 to be welded on the welding boss 112 with the mark is machined when step S04 is executed.

[0100] Alternatively, the third preset value is less than the second preset value, and in the embodiment, the third preset value is set to 0.1°. It should be noted that in the embodiment, the second preset value is set to 0.2°, and it can be understood that in other embodiments, other values between the third preset value and the first preset value can also be selected. It should be noted that the specific values of the first preset value, the second preset value and the third preset value are not limited to the angle values provided in the application, and the first preset value, the second preset value and the third preset value can also be adjusted adaptively for different sizes of the rear force-bearing casing.

[0101] S05: welding to form an outer ring 130.

[0102] The outer ring parts 124 of the plurality of support plates 120 are spliced to form a ring member. Further, in the embodiment, since the outer ring part 124 also includes the front mounting edge 131 and the rear mounting edge 132 arranged at the two axial ends, in the embodiment, the step of welding to form the outer ring 130 includes:

[0103] S51: The front mounting edge 131 and the rear mounting edge 132 are respectively welded and fixed to the outer ring part 124 of the plurality of support plates 120 by spot welding.

[0104] The welding is performed by spot welding to fix the positions of the front mounting edge 131 and the outer ring part 124 of the plurality of support plates 120, and the rear mounting edge 132 is also welded and fixed to the axial side of the outer ring part 124 of the plurality of support plates 120 by spot welding. The front mounting edge 131 and the rear mounting edge 132 are respectively located on the two axial sides of the outer ring part 124, for example, Figure 7 The welding position of the welding and fixing of the front mounting edge 131 and the rear mounting edge 132 to the outer ring part 124 is shown.

[0105] S52: The outer ring parts 124 of the plurality of support plates 120 are spliced to form a ring member.

[0106] The step of splicing the outer ring parts 124 of the plurality of support plates 120 to form a ring member specifically includes:

[0107] The outer ring parts 124 of the adjacent lug support plate members 121 are welded and fixed to each other.

[0108] The gap size between the adjacent second branch plate 120 and the non-lug branch plate 122 is obtained, and the first outer ring plate 133 is made according to the gap size.

[0109] The gap size between the adjacent two non-lug branch plates 122 is obtained, and the second outer ring plate 134 is made according to the gap size.

[0110] Figure 8 A structure schematic diagram formed after step S51 in the embodiment is shown, Figure 9 A partial structure schematic diagram of the structure formed after step S51 in the embodiment is shown from another perspective. Please refer to Figures 1-9 In the embodiment, three lug branch plates 121 are sequentially arranged along the circumference of the inner ring 110, and the adjacent two lug branch plates 121 are connected to each other, so that there is no gap between the adjacent two lug branch plates 121. The non-lug branch plates 122 are arranged at intervals, and the non-lug branch plates 122 adjacent to the lug branch plates 121 are also arranged at intervals. In order to splice to form a circumferentially closed annular member, an outer ring plate needs to be welded at the gap to fill the gap.

[0111] Specifically, the gap between the adjacent lug branch plate 121 and the non-lug branch plate 122 is filled and closed by the first outer ring plate 133. The first outer ring plate 133 is processed and made by measuring the distance W between the front mounting edge 131 and the rear mounting edge 132, and the distance L1 between the outer ring portion 124 of the lug branch plate 121 and the non-lug branch plate 122. The gap between the adjacent two non-lug branch plates 122 is filled and closed by the second outer ring plate 134. Specifically, the second outer ring plate 134 is processed and made by measuring the distance W between the front mounting edge 131 and the rear mounting edge 132, and the distance L2 between the adjacent non-lug branch plates 122.

[0112] After the first outer ring plate 133 and the second outer ring plate 134 are processed, the first outer ring plate 133 is welded and fixed between the adjacent lug branch plate 121 and the non-lug branch plate 122, and the second outer ring plate 134 is welded and fixed between the adjacent two non-lug branch plates 122, so as to splice to form an axially closed annular member. Alternatively, spot welding is used for welding and fixing the first outer ring plate 133 and the second outer ring plate 134, that is, the position fixing of the first outer ring plate 133 and the second outer ring plate 134 can be realized by only a few welding points.

[0113] S53: The front mounting edge 131, the rear mounting edge 132, the outer ring portion 124, the first outer ring plate 133, and the second outer ring plate 134 are connected and fixed by electron beam welding.

[0114] The connection between the front mounting edge 131, the rear mounting edge 132, the outer ring part 124, the first outer ring plate 133 and the second outer ring plate 134 is welded by electron beam welding, so as to ensure the welding stability.

[0115] Further, after the step S43 is performed, the split rear load-bearing casing 100 obtained by welding can be subjected to solid solution and stress relief heat treatment, and X-ray and fluorescence detection. Specifically, the specific parameters of the solid solution and stress relief heat treatment can use the parameters used in the existing split rear load-bearing casing.

[0116] After the step S05 is performed, the split rear load-bearing casing 100 can be subjected to subsequent machining according to requirements, for example, machining the front mounting edge 131, the rear mounting edge 132 and other structures.

[0117] The split rear load-bearing casing 100 and the welding manufacturing method thereof provided by the embodiments of the present application can solve the problem of misalignment of the welding seam, solve the problem that the deformation of the castings and the deformation in the welding process affect the quality of the welding seam in the split welding rear casing scheme, and improve the process success rate and the reliability of the parts of the large-size rear casing.

[0118] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for welding and manufacturing a split-type rear-bearing casing, characterized in that, The aforementioned welding manufacturing method for a split-type rear-supporting casing is used to manufacture a split-type rear-supporting casing, which includes an inner ring and multiple support plates; the outer periphery of the inner ring is provided with multiple welding bosses; each support plate includes a support plate body and an outer ring portion fixedly connected to the support plate body, the support plate body being connected to the welding bosses; the outer ring portions of the multiple support plates are used to splice together to form the outer ring of the split-type rear-supporting casing; The welding manufacturing method for the split-type rear-bearing casing includes: Calculate the airfoil deflection angle of the welding boss; The welding boss is machined into a blade shape according to the blade deflection angle. The main body of the support plate is welded and fixed to the welding boss to achieve welding and fixing of the support plate to the inner ring; The outer ring is processed and compensated according to the blade deflection angle to ensure that the spliced ​​outer ring has a ring structure that is coaxially distributed with the inner ring.

2. The method for welding and manufacturing a split-type rear-bearing casing according to claim 1, characterized in that, The welding boss includes a cast blade portion and a cast allowance portion, the cast allowance portion being used for welding to the support plate body; the step of calculating the blade deflection angle of the welding boss includes: The cross-sectional profile of the allowance portion of the casting is obtained as the first cross-sectional profile; The cross-sectional profile of the blade portion of the casting is obtained as the second cross-sectional profile; The blade deflection angle is obtained by fitting the first cross-sectional profile, the second cross-sectional profile, and the theoretical blade profile.

3. The method for welding and manufacturing a split-type rear-bearing casing according to claim 2, characterized in that, The step of fitting the blade deflection angle based on the first cross-sectional profile, the second cross-sectional profile, and the theoretical blade profile includes: Calculate according to the following formula, and... The angle α at its minimum value is the deflection angle of the blade shape. Among them, P ai Q represents the airfoil coordinates of the i-th section on the theoretical airfoil profile of the first section profile after deflection by an angle α; ai P represents the airfoil coordinates of the i-th section on the first section profile; bi Q represents the airfoil coordinates of the i-th section on the theoretical airfoil profile of the second section profile after deflection by an angle α; bi Let be the leaf shape coordinates of the i-th section on the second section profile; n is a positive integer.

4. The method for welding and manufacturing a split-type rear-bearing casing according to claim 1, characterized in that, The steps of machining the welding boss according to the blade deflection angle include: If the blade deflection angle is greater than or equal to the first preset value, the processing of the welding boss of the inner ring is stopped. If the blade deflection angle is less than the first preset value, and the blade deflection angle is greater than the second preset value, then the theoretical blade profile is deflected by the blade deflection angle to form a machined blade profile, and the welding boss corresponding to the blade deflection angle is machined according to the machined blade profile; if the blade deflection angle is less than or equal to the second preset value, then the welding boss corresponding to the blade deflection angle is machined according to the theoretical blade profile. The first preset value is greater than the second preset value.

5. The method for welding and manufacturing a split-type rear-bearing casing according to claim 4, characterized in that, After calculating the blade deflection angle of the welding boss, the split rear load-bearing casing welding manufacturing method further includes marking the welding boss corresponding to the blade deflection angle that is greater than or equal to a third preset value. The steps for machining compensation of the outer ring based on the blade deflection angle include: The outer ring portion of the support plate to be welded to the marked welding boss is machined; The third preset value is less than the second preset value.

6. The method for welding and manufacturing a split-type rear-bearing casing according to claim 1, characterized in that, The support plate includes a lug support plate and a non-lug support plate; before the step of welding and fixing the main body of the support plate to the welding boss, the welding manufacturing method of the split rear load-bearing casing further includes: machining the support plate; the machining step of the support plate includes: The welding end of the support plate body used for welding with the welding boss is processed; The two ends of the outer ring portion of the lifting lug support plate are machined.

7. The method for welding and manufacturing a split-type rear-bearing casing according to claim 6, characterized in that, The method for welding and manufacturing the split-type rear-bearing casing further includes the step of welding to form the outer ring; the outer ring includes a circumferentially closed annular component, a plurality of the lifting lug support plates are arranged adjacent to each other, and a plurality of the non-lifting lug support plates are arranged adjacent to each other; the step of welding to form the outer ring includes the step of splicing the outer ring portions of the plurality of support plates to form the annular component; the step of splicing the outer ring portions of the plurality of support plates to form the annular component includes: The outer ring portions of adjacent lifting lug support plates are welded together for fixation; Obtain the gap size between adjacent lug support plates and non-lug support plates, and fabricate a first outer ring plate according to the gap size; Obtain the gap size between two adjacent non-lug support plates, and fabricate a second outer ring plate according to the gap size; The first outer ring plate is welded and fixed between the adjacent lug support plate and the non-lug support plate, and the second outer ring plate is welded and fixed between two adjacent non-lug support plates to form a circumferentially closed ring.

8. The method for welding and manufacturing a split-type rear-bearing casing according to claim 7, characterized in that, The outer ring further includes a front mounting edge and a rear mounting edge disposed at both axial ends of the annular member; before the step of splicing the outer ring portions of the plurality of support plates to form the annular member, the step of welding to form the outer ring further includes: The front mounting edge and the rear mounting edge are respectively spot-welded to the outer ring portion of the plurality of support plates for positioning; wherein, the mounting edge and the rear mounting edge are respectively located on both axial sides of the outer ring portion; After the step of splicing the outer ring portions of the plurality of support plates to form the ring member, the step of welding to form the outer ring further includes: The front mounting edge, the rear mounting edge, the outer ring portion, the first outer ring plate, and the second outer ring plate are connected and fixed by electron beam welding.

9. A split-type rear-supporting casing, characterized in that, The split rear load-bearing casing is obtained by the welding manufacturing method of the split rear load-bearing casing as described in any one of claims 1-8.

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