CN114633041A - Welding joint of diffuser and inner casing of combustion chamber casing and machining method - Google Patents

Welding joint of diffuser and inner casing of combustion chamber casing and machining method Download PDF

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Publication number
CN114633041A
CN114633041A CN202210436945.2A CN202210436945A CN114633041A CN 114633041 A CN114633041 A CN 114633041A CN 202210436945 A CN202210436945 A CN 202210436945A CN 114633041 A CN114633041 A CN 114633041A
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China
Prior art keywords
welding
section
joint
thickness
diffuser
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Chinese (zh)
Inventor
李新孝
毛克亮
叶孙军
杜培升
李晓飞
万雪莲
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AECC Aviation Power Co Ltd
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AECC Aviation Power Co Ltd
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Priority to CN202210436945.2A priority Critical patent/CN114633041A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups

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  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention discloses a welding joint and a processing method of a diffuser and an inner casing of a combustor casing, wherein a first connecting section and a first welding section are integrally arranged on the diffuser; the bisection plane of the thickness of the first connecting section and the bisection plane of the thickness of the first welding section are overlapped, and the joint thickness of the first welding section is larger than the thickness of the first connecting section; a back lining is arranged on one side of the first welding section and is integrally arranged with the first welding section; the width of the backing is greater than the joint width of the first welding section; the inner casing is integrally provided with a second connecting section and a second welding section; the middle parting surface of the thickness of the second connecting section and the middle parting surface of the thickness of the second welding section are overlapped; the joint thickness of the second welding section is greater than the thickness of the second connecting section. During welding, the bisection plane of the first welding section and the bisection plane of the second welding section are overlapped. This welded joint has rationally solved the welded joint dislocation problem that the casting of casting diffuser warp and lead to, has effectively promoted welding precision and welding strength, has effectively ensured the intensity of structure and the security of engine.

Description

Welding joint of diffuser and inner casing of combustion chamber casing and machining method
Technical Field
The invention belongs to the field of manufacturing of aero-engines and gas turbines, and relates to a welding joint of a diffuser and an inner casing of a combustion chamber casing and a machining method.
Background
The combustor casing of a turbofan engine is generally composed of three major portions, a diffuser, an inner casing, and an outer casing. Because of manufacturing process limitations, the three parts need to be machined separately and then joined together. The most common connection method between the diffuser and the inner casing and the outer casing is a welded joint, as shown in fig. 16, and the connection between the diffuser and the inner casing in the prior art is schematically shown in fig. 17.
The diffuser is usually precision cast because of its complex structure with narrow flow passages and short thin-walled hollow straightening vanes. The flange edges welded with the inner casing and the outer casing of the diffuser have certain overhanging length and thin wall thickness, so the diffuser is greatly deformed under the action of casting thermal stress, and the position error of the flange edges and the warping error of the molded surface are large. When designing the welded joint, if the welded joint is designed according to the design drawing requirements without considering the deformation of the diffuser, severe misalignment may be formed at the welded joint, so that the welded joint bonding area is reduced, and the structural strength and the engine safety are affected, as shown in fig. 18.
At present, no standard can be relied on when the welding joint is designed, the deformation of the flange edge of the diffuser is not analyzed in detail, the difference of two influence factors of the position error and the warping deformation error of the flange edge is not distinguished, the two errors are not quantized enough, the welding joint is large in design error, and the joint quality and the bonding strength are greatly influenced.
If the welded joint of the cast flange is unreasonable in design, the butt joint of the inner casing is difficult to design correctly, which causes errors in two aspects:
firstly, the welded joint of the inner casing is easy to be designed to be smaller. When the inner casing part is smaller, the high point and the low point of the diffuser flange warpage deformation can not be completely butted with the inner casing joint, and local misalignment exists. The local misalignment can be shielded by the thickened diffuser joint and is not easy to be found during assembly before welding, but can be easily reflected when weld joint front weld height and back lining on the reverse side are removed after welding, and the local steps on the two sides of the joint are deeper.
Secondly, the centering performance of the joint of the inner casing is neglected. Neglecting the alignment of the joint, the thickening amount of the two faces of the inner casing cannot be correctly distributed, and the result is that the inner casing flange and the diffuser flange are integrally staggered. When the welding head is assembled before welding, the dislocation is not easy to be found due to the influence of the thickened joint, but when the welding head with the front welding height and the back lining of the back side of the welding line are removed after welding, the overall dislocation is easy to reflect, and the phenomenon that the depth difference of steps on the two sides of the joint is large, even the directions are opposite is shown.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a welding joint and a processing method of a diffuser and an inner casing of a combustion chamber casing, so that the butt joint precision of a welding line is high, the strength is reliable, and the strength of the structure and the safety of an engine are effectively improved.
The invention is realized by the following technical scheme:
a diffuser of a combustion chamber casing and a welding joint of an inner casing are provided, wherein a first connecting section and a first welding section are integrally arranged on the diffuser; the bisection plane of the thickness of the first connecting section and the bisection plane of the thickness of the first welding section are overlapped, and the thickness of the joint of the first welding section is larger than that of the first connecting section;
a backing is arranged on one side of the first welding section, and the backing and the first welding section are integrally arranged;
the inner casing is integrally provided with a second connecting section and a second welding section; the middle parting surface of the thickness of the second connecting section and the middle parting surface of the thickness of the second welding section are overlapped; the joint thickness of the second welding section is larger than the thickness of the second connecting section.
Preferably, the joint thickness of the first welded segment includes a maximum thickness of an actual contour boundary of the first connecting segment.
Preferably, the joint thickness of the first welded segment further includes a thermal stress deformation displacement of the first connecting segment during casting.
Preferably, self-filling materials are further arranged on two sides of the first welding section, the thickness of the joint of the first welding section further comprises the thickness of the self-filling materials, and the thickness of the self-filling materials is 1-2 mm.
Preferably, the joint thickness of the first welding section further comprises a turning allowance during turning, and the turning allowance is 1-3 mm.
Preferably, the back lining extends out of the free end of the first welding section, the extending length of the back lining is 2-4 mm, and the thickness of the back lining is 2-4 mm.
Preferably, the width of the joint of the first welding section is 2-5 mm, and the width of the joint of the second welding section is 2-4 mm.
Preferably, the first connecting section and the first welding section are in circular arc transfer or inclined plane transfer; when the circular arc switching is adopted, the radius of the circular arc is not less than 2.5 mm.
A combustor casing comprises a diffuser and an inner casing welded joint.
A processing method for a welding joint of a diffuser and an inner casing of a combustor casing comprises the following steps:
s1: processing the diffuser;
s2: processing the inner casing;
s3: superposing the bisector of the first welding section and the bisector of the second welding section, enabling the second welding section to be attached to the backing, welding and assembling the first welding section and the second welding section, and welding by adopting vacuum electron beam welding;
s4: turning off the back lining of the back side of the welded seam and the welding height of the front side of the welded seam in the step S3, wherein the turning surfaces of the back side of the welded seam and the front side of the welded seam are respectively tangent with the high point of the actual profile of the first connecting section;
s5: and performing shape following grinding on the first welding section and the second welding section of the workpiece which is finished by the step S4, so that the thicknesses of the first welding section and the second welding section after grinding are consistent with the actual thickness of the first connecting section.
Compared with the prior art, the invention has the following beneficial technical effects:
a welding joint of a diffuser and an inner casing of a combustion chamber casing is characterized in that the joint thickness of a first welding section on the diffuser is larger than that of a first connecting section; the thickness of the joint of the second welding section is larger than that of the second connecting section, and the strength of a welding surface is effectively guaranteed. The bisection plane of the thickness of the first connecting section and the bisection plane of the thickness of the first welding section are arranged in a superposed mode, the bisection plane of the thickness of the second connecting section and the bisection plane of the thickness of the second welding section are arranged in a superposed mode, and therefore centering of the first welding section and the first welding section is effectively guaranteed. The arranged backing ensures that the welding seam is completely welded, and simultaneously avoids spark splash and damage of internal components caused by electron beam breakdown of the welding seam. Effectively promote welding precision and welding strength, effectively ensured the intensity of structure and the security of engine.
Furthermore, the joint thickness of the first welding section comprises the maximum thickness of the actual contour boundary of the first connecting section, so that incomplete welding caused by surface corrugation of the first connecting section can be effectively solved.
Furthermore, the joint thickness of the first welding section also comprises the thermal stress deformation displacement of the first connecting section in the casting process, and the welding error caused by the thermal stress deformation displacement is effectively eliminated.
Furthermore, the self-filling material effectively meets the flatness of the surface of the welded seam after welding.
Furthermore, the machining allowance is 1-3 mm, and the requirement on the weight of the part is effectively met.
Furthermore, the depth of the backing is 2-4 mm, and the thickness of the backing is 2-4 mm, so that the requirement on the weight of the part is effectively met.
Furthermore, the width of the joint of the first welding section is 2-5 mm, and the width of the joint of the second welding section is 2-5 mm, so that the requirement on the weight of the part is effectively met.
A processing method of a welding joint of a diffuser and an inner casing of a combustion chamber casing is characterized in that the diffuser and the inner casing are processed according to the method and are welded together, and during welding, a median plane of a first welding section and a median plane of a second welding section are superposed, so that the centering of the welded joint is effectively met, and the strength of the structure and the safety of an engine are ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a first connection section and a first welding section of a diffuser according to the present invention;
FIG. 2 is a schematic structural view of a second connecting section and a second welding section of the inner casing according to the present invention;
FIG. 3 is a schematic structural view of a welded joint between a diffuser and an inner casing according to the present invention;
FIG. 4 is a view of the V-V plane of FIG. 3, shown as a circle;
FIG. 5 is a schematic cross-sectional view taken along line A-A of the diffuser and the inner casing of FIG. 4 after welding;
FIG. 6 is a schematic cross-sectional view taken along line B-B of the diffuser and inner casing of FIG. 4 after welding;
FIG. 7 is a schematic cross-sectional view at C-C of the diffuser and inner casing of FIG. 4 after welding;
FIG. 8 is a schematic cross-sectional view of FIG. 5 after polishing at both sides A-A;
FIG. 9 is a schematic cross-sectional view of the side of FIG. 6 after polishing at B-B;
FIG. 10 is a schematic cross-sectional view of the side of FIG. 7 after polishing at C-C;
FIG. 11 is a schematic illustration of a first weld segment joint thickness setting;
FIG. 12 is a schematic view of a position error of a first weld segment;
FIG. 13 is a schematic illustration of the joint thickness after increasing the self-packing thickness on both sides of the first weld segment;
FIG. 14 is a schematic illustration of the joint thickness after a backing is provided to one side of the first weld segment;
FIG. 15 is a schematic view of the joint thickness with increased machining allowance on both sides of the first weld segment;
FIG. 16 is a schematic view of the components and connections of a prior art combustor case;
FIG. 17 is an enlarged schematic view at I of FIG. 16;
FIG. 18 is a schematic view of a prior art diffuser welded to an inner casing weld joint;
FIG. 19 is a weld joint on a diffuser machined in accordance with the present invention;
FIG. 20 is a weld joint on an inner barrel machined in accordance with the present invention;
FIG. 21 is a schematic structural view of the diffuser and the inner casing of the present invention after being welded by electron beams;
FIG. 22 is a cross-sectional view of the V-V plane of FIG. 21 with the weld back backing removed and the V-V plane expanded circumferentially;
FIG. 23 is a cross-sectional view showing the V-V plane expanded circumferentially after polishing both sides of the weld in the present invention.
Wherein: 11. the welding device comprises a first connecting section, 12, a first welding section, 13, a backing, 21, a second connecting section, 22, a second welding section, 3, an outer casing, 4, an inner casing, 5, a diffuser, 6 and an electron beam welding seam.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 16 and 17, the combustor casing of the turbofan engine is generally composed of three major parts, i.e., a diffuser 5, an inner casing 4 and an outer casing 3. The most common connection of the diffuser to the inner and outer housings is by a weld joint, such as an electron beam weld 6. The flange edges welded with the inner casing and the outer casing of the diffuser have certain overhanging length and thin wall thickness, so the diffuser is greatly deformed under the action of casting thermal stress, and the position error of the flange edges and the warping error of the molded surface are large. When designing the welded joint, if the welded joint is designed according to the design drawing requirements without considering the deformation of the diffuser, severe misalignment may be formed at the welded joint, so that the welded joint bonding area is reduced, and the structural strength and the engine safety are affected, as shown in fig. 18.
The invention discloses a welding joint of a diffuser and an inner casing of a combustor casing, as shown in figure 1, a first connecting section 11 and a first welding section 12 are integrally arranged on the diffuser; the middle facet of the thickness of the first connecting section 11 and the middle facet of the thickness of the first welding section 12 are overlapped, and the joint thickness of the first welding section 12 is larger than the thickness of the first connecting section 11; the joint width of the first welding section 12 is 2-5 mm;
one side of the first welding section 12 is provided with a back lining 13, and the back lining 13 and the first welding section 12 are integrally arranged; the backing 13 extends out of the free end of the first welding section 12, the extending length is 2-4 mm, and the thickness of the backing 13 is 2-4 mm.
The first connecting section 11 and the first welding section 12 are in arc transfer or inclined plane transfer; when the circular arc switching is adopted, the radius of the circular arc is not less than 2.5 mm.
As shown in fig. 2, a second connecting section 21 and a second welding section 22 are integrally arranged on the inner casing; the middle facet of the thickness of the second connecting section 21 and the middle facet of the thickness of the second welding section 22 are overlapped; the joint thickness of the second welding section 22 is greater than the thickness of the second connecting section 21; the joint width of the second welding section 22 is 2-4 mm. The backing 13 is overlapped with the second welding section 22, on one hand, the backing is used for positioning the second welding section 22, on the other hand, the backing can shield the electron beam in the welding process, the electron beam penetrating through the welding seam is prevented from burning other parts, and meanwhile, sparks are prevented from splashing.
The first welded segment 12 and the second welded segment 22 have joint thicknesses that are consistent.
Since the cast flange, i.e. the first welding segment 12, will be warped during the casting process, and the boundary of the butt-joint surface of the welding seam is a wavy line with undulation, the welding joint must be designed according to the maximum boundary of the cast flange to ensure the butt-joint surface is completely welded. I.e. the joint thickness of the first welded section 12 comprises the maximum thickness of the actual contour boundary of the first connecting section 11. The first connecting section 11 is a conical surface at the joint, when the axis of the first connecting section 11 is placed in the vertical direction, the boundary of the butt-welding surface is a wavy surface with undulation, and the butt-welding surface has a maximum upper boundary and a minimum lower boundary, namely, the joint thickness of the first welding section 12 includes the distance between the maximum upper boundary and the minimum lower boundary.
Since a position error may occur during the casting of the cast flange, the joint thickness of the first welded segment 12 also includes a thermal stress deformation displacement of the first connection segment 11 during the casting.
In order to ensure that the surface of the welding seam is not sunken, self-filling materials need to be added to the front surface of the welding seam, and the self-filling materials can be added to one side of the welding seam and can also be added to two sides of the welding seam. Therefore, the joint thickness of the first welding section 12 also comprises the thickness of self-filling materials, and the thickness of the self-filling materials is 1-2 mm.
When the first welding section 12 is manufactured before welding, enough turning allowance must be reserved on the upper surface and the lower surface, so that the joint thickness of the first welding section 12 further comprises the turning allowance during turning, and the turning allowance is 1-3 mm.
As shown in fig. 3, which is a schematic structural view of the diffuser and the inner casing after welding, it can be seen that the first connection section 11 and the second connection section 21 are arranged in a center.
As shown in FIG. 4, the first welding segment 12 is warped during the casting process, and the boundary of the butt-jointed surface of the welding seam is a wavy line with undulation. As shown in FIGS. 5-7, the welding forms are different from each other at different welding positions. The excess material is present on both sides of the weld site so that the final part does not meet the weight requirements, and therefore, after welding, the joint local surfaces of the portions of the connecting section surface below the weld section surface can be ground, such as the upper and lower surfaces of section a-a in fig. 5, the upper surface of section B-B in fig. 6 and the lower surface of section C-C in fig. 7. After polishing, the wall thickness is closer to the design requirement value, the step depth is reduced, the molded surface is smoother, and the weight is controlled. The shapes of the ground weld joints are shown in fig. 8, 9 and 10, respectively.
According to the invention, when the welding joint of the precision casting, namely the first welding section, is designed, the actual casting error of the precision casting is considered, the butt joint thickness of the welding seam is increased, and the problem of reduction of the effective butt joint area of the welding seam caused by casting deformation of the flange is avoided. And the position error and the warping deformation error of the cast flange are separately detected and evaluated, and quantitative design is performed, so that the design method is more scientific, and the design result is more accurate. The invention designs the thickness of the forging piece, namely the inner casing, on one side of the casting piece, namely the diffuser, according to the thickness of the joint on one side of the casting piece, namely the diffuser, so as to obtain the forging piece joint with two symmetrically thickened surfaces, eliminate the dislocation of the joint, and ensure that the two surfaces of a welding seam are uniformly sunken and the transfer of the molded surface is smoother. According to the invention, the influence factors such as welding deformation are considered, and the allowance of the turning and removing welding height is increased on the front side of the welding line; the allowance of backing is added on the back of the welding seam. The reduction of the effective wall thickness caused by the damage to the main material when the welding height and the back lining are removed after welding is avoided. The invention adopts the welding joint with the backing, ensures the complete penetration of the welding line and avoids the spark splash and the damage caused by the electron beam puncturing the welding line.
Further, for the sake of better clarity of explanation of the present invention, as shown in fig. 11, the joint thickness, i.e., the wall thickness, of the first connecting section 11 may be considered as t. The first welding segment 12 is warped and deformed during the casting process, the boundary of the butt joint surface of the welding seam is a wavy line with undulation, and the welding joint must be designed according to the maximum boundary of the cast flange in order to ensure that the butt joint surface is completely welded. I.e. the joint thickness of the first welded section 12 comprises the maximum thickness of the actual contour boundary of the first connecting section 11. The first connecting section 11 is a conical surface at the joint, when the axis of the first connecting section 11 is placed in the vertical direction, the boundary of the butt-welding surface is a wavy surface with undulation, and the butt-welding surface has a maximum upper boundary and a minimum lower boundary, namely, the joint thickness of the first welding section 12 includes the distance between the maximum upper boundary and the minimum lower boundary. And the transverse distance between the highest point of the upper boundary and the lowest point of the lower boundary of the butt joint surface of the cast flange weld is called as the maximum thickness and is represented by T, and the maximum deformation is represented by W, so that T is T + W.
As shown in fig. 12, the casting position error of the flange is denoted by E, and the position error is introduced by adding margins E to both sides of the first welded segment 12, i.e., the joint, respectively. The joint thickness at this time is T + 2E. In the figure, point P is the position where the first connecting section 11 is theoretically designed to be located, and point P' is the position where the first connecting section 11 is actually located after casting.
Under the condition that the welding height is not excessive, the welding seam is not required to be processed generally. But in order to ensure that the surface of the welding seam is smooth and free from depression, the two surfaces of the welding seam are required to be additionally provided with margins, and the margins are removed after welding. In order to ensure that the surface of the welding seam is not sunken, self-filling materials are required to be added to the front surface of the welding seam, the self-filling materials can be added to one side of the welding seam, and can also be added to two sides of the welding seam. The increased self-filler thickness is indicated by X. The welding seam adopts electron beam welding. A backed weld joint is typically used. The backing prevents the electron beam from penetrating the weld joint, but requires machining the backing away after welding. In order to prevent the damage of the main body of the part when the back lining is processed, a certain processing allowance is added on the back surface of the welding seam. To simplify the design, a machining allowance X equal to the front side of the weld is added to the back side of the weld, and the thickness of the welded joint is T +2E +2X at this time, as shown in FIG. 13. The size of the margin X is related to welding deformation, and the larger the welding seam deformation after welding is, the larger the margin needs to be correspondingly increased, generally about 1 mm.
Adding a back lining on the back of the welding seam, wherein the function of the back lining is positioning; the second function is to shield the electron beam, prevent the electron beam penetrating the welding seam from burning other parts and prevent the spark from splashing. The thickness of the backing is indicated by B as shown in fig. 14.
The machining allowance is represented by Y. The casting dimensions of the joint are obtained by adding the margins Y to both sides of the joint, respectively, as shown in fig. 15.
The precision casting diffuser provided by the invention comprehensively considers the position error and the deformation error of the casting flange on the diffuser, the designed welding joint has good centering performance, and the local misalignment is eliminated. The welding joint of the aero-engine combustion chamber casing is designed according to the method, the butt joint precision of the welding seam is high, and the strength is reliable; meanwhile, the two sides of the welding seam are smoothly connected with the molded surface of the flange, and the appearance quality is good. The method can be popularized and applied to other welding seams with similar structures and characteristics, can ensure the bonding strength and improve the welding seam quality.
The processing process of the invention comprises the following steps:
(1) lathe machining diffuser welded joint
The welded joint of the machined diffuser is shown in the structural dimension of fig. 19.
(2) Welding joint of turning inner casing
And (4) turning the inner casing welding joint, wherein the structural dimension is shown in figure 20.
(3) Assembly welding
The inner casing and diffuser are assembled as shown in fig. 21.
(4) Turning off weld back backing and turning weld front weld height
After machining, the joint construction is shown in fig. 22.
(5) Local grinding
If the design has strict requirements on weight, the local surface of the joint with low profiles on two sides can be ground, such as the upper surface and the lower surface of the A-A section, the upper surface of the B-B section and the lower surface of the C-C section in the figure 22. After polishing, the wall thickness is closer to the design requirement value, the step depth is reduced, the molded surface is smoother, and the weight is controlled. The ground joint shape is shown in fig. 23.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A welding joint of a diffuser and an inner casing of a combustion chamber casing is characterized in that a first connecting section (11) and a first welding section (12) are integrally arranged on the diffuser; the bisection plane of the thickness of the first connecting section (11) and the bisection plane of the thickness of the first welding section (12) are overlapped, and the joint thickness of the first welding section (12) is larger than the thickness of the first connecting section (11);
a backing (13) is arranged on one side of the first welding section (12), and the backing (13) and the first welding section (12) are integrally arranged;
a second connecting section (21) and a second welding section (22) are integrally arranged on the inner casing; the bisection plane of the thickness of the second connecting section (21) and the bisection plane of the thickness of the second welding section (22) are overlapped; the joint thickness of the second welding section (22) is greater than the thickness of the second connecting section (21).
2. A welding joint of a diffuser and an inner casing of a combustion casing according to claim 1, characterized in that the joint thickness of said first welding section (12) comprises the maximum thickness of the actual contour boundary of the first connection section (11).
3. A welding joint of a diffuser and an inner casing of a combustion chamber casing according to claim 2, characterized in that the joint thickness of said first welding section (12) also comprises the thermal stress deformation displacement of said first connection section (11) during the casting process.
4. The welding joint of the diffuser and the inner casing of the combustor casing according to claim 3, wherein self-filling materials are further arranged on two sides of the first welding section (12), the thickness of the joint of the first welding section (12) further comprises the thickness of the self-filling materials, and the thickness of the self-filling materials is 1-2 mm.
5. The welding joint of a diffuser and an inner casing of a combustor casing as claimed in claim 4, wherein the joint thickness of the first welding section (12) further comprises a turning allowance during turning, and the turning allowance is 1-3 mm.
6. The welding joint of a diffuser and an inner casing of a combustor casing according to claim 1, wherein the backing (13) extends beyond the free end of the first welding section (12) by a length of 2-4 mm, and the thickness of the backing (13) is 2-4 mm.
7. The welding joint of a diffuser and an inner casing of a combustor casing according to claim 1, wherein the joint width of the first welding section (12) is 2-5 mm, and the joint width of the second welding section (22) is 2-4 mm.
8. The welding joint of a diffuser and an inner casing of a combustor casing according to claim 1, characterized in that the first connecting section (11) and the first welding section (12) are in circular arc transition or bevel transition; when the circular arc switching is adopted, the radius of the circular arc is not less than 2.5 mm.
9. A combustor casing comprising a welded joint of a diffuser and an inner casing as claimed in any one of claims 1 to 8.
10. A processing method for a welding joint of a diffuser and an inner casing of a combustor casing is characterized by comprising the following steps of:
s1: processing a diffuser according to any one of claims 1 to 8;
s2: processing the internal casing according to any one of claims 1 to 8;
s3: superposing the bisection plane of the first welding section (12) and the bisection plane of the second welding section (22), enabling the second welding section (22) to be attached to the backing (13), welding and assembling the first welding section (12) and the second welding section (22), and welding by adopting vacuum electron beam welding;
s4: turning off a back lining (13) on the back surface of the welded seam and the welding height on the front surface of the welded seam in the step S3, wherein the turning surfaces on the back surface of the welded seam and the front surface of the welded seam are respectively tangent with the high point of the actual profile of the first connecting section (11);
s5: and performing shape following grinding on the first welding section (12) and the second welding section (22) of the workpiece which is finished by the step S4, so that the thicknesses of the first welding section and the second welding section after grinding are consistent with the actual thickness of the first connecting section (11).
CN202210436945.2A 2022-04-19 2022-04-19 Welding joint of diffuser and inner casing of combustion chamber casing and machining method Pending CN114633041A (en)

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