Machining method for ultra-thin-wall high-temperature alloy sealing piece welding assembly with narrow U-shaped circular ring

Abstract

The invention discloses a machining method of a welding assembly with a narrow U-shaped circular ring ultra-thin wall high-temperature alloy sealing piece, which comprises the following steps: firstly, respectively forming a semi-finished product of an annular sealing piece A with an L-shaped section and a semi-finished product of an annular sealing piece B with an L-shaped section, then aligning and assembling welding surfaces of the two semi-finished products, then carrying out spot welding, and positioning by the welding surfaces; and one edge of the semi-finished product of the annular sealing piece A is pressed, one edge of the semi-finished product of the annular sealing piece B is subjected to flanging treatment, a final U-shaped face is obtained, and the surplus is cut according to a part drawing to obtain the final size. By the adoption of the machining method, the problem that a spot welding electrode cannot directly weld a U-shaped opening can be solved, the consistency of molded surfaces of a narrow U-shaped circular ring ultra-thin wall high-temperature alloy sealing piece welding assembly is guaranteed, the design requirement for size precision is met, and it is guaranteed that the requirements for sealing performance and consistency are met.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing and relates to a processing method of a welding assembly of an ultra-thin-wall high-temperature alloy sealing sheet with a narrow U-shaped circular ring. Background Art

[0002] High temperature alloy sealing piece welding assembly is a sealing component in aircraft engines. The sealing piece welding assembly is made of annular sealing piece A and annular sealing piece B through spot welding. The part structure is as follows Figure 1 Annular sealing piece A is a circular ring with an outer L-shaped cross section, with a material thickness of 0.25mm, a height of 6mm, an outer diameter of 666.1mm, and an outward flange of 2.35mm; Annular sealing piece B is a circular ring with a narrow opening U-shaped cross section, with a material thickness of 0.25mm, a height of 7.2mm, an outer diameter of 665.35mm, and an inner diameter of 656.3mm.

[0003] Since the material thickness of the parts is too thin and the U-shaped opening of the annular sealing piece B is 4.15mm wide, the traditional solution for processing welding components generally uses the processed single pieces for assembly and positioning, and then processes according to the welding technical requirements. However, when the sealing piece welding assembly is assembled and welded using the processed annular sealing pieces A and annular sealing pieces B in the early stage, the opening of the U-shaped cross-section of the annular sealing piece B is too narrow to be pressurized and welded between the upper and lower electrodes of the spot welding machine. The only way is to shrink the edges of the U-shaped ring that are not required for spot welding inward by fitters to increase the U-shaped ring groove so that the spot welding machine can pressurize and weld as required. Processing the narrow U-shaped ring after welding will result in inconsistent profiles in the processed welding components, and the local size is difficult to guarantee, which cannot play a sealing role in the assembly of the upper-level large components.

[0004] Based on the above reasons, it is necessary to propose a processing method for a welding assembly of an ultra-thin-wall high-temperature alloy sealing piece with a narrow U-shaped ring to meet the quality requirements of part shape and dimensional accuracy. Summary of the invention

[0005] In response to the problems recorded in the background technology, the present invention aims to provide a processing method for a narrow U-shaped circular ring ultra-thin wall high-temperature alloy sealing sheet welding assembly, to ensure the surface consistency of the narrow U-shaped circular ring ultra-thin wall high-temperature alloy sealing sheet welding assembly, and the dimensional accuracy meets the design requirements, thereby ensuring compliance with the sealing requirements.

[0006] The present invention adopts a reasonable processing method, firstly processes the single pieces into semi-finished products, spot welds them and then accurately forms a narrow U-shaped surface to meet the quality requirements of part size and shape accuracy.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A processing method for a welding assembly of an ultra-thin-wall high-temperature alloy sealing piece with a narrow U-shaped circular ring, wherein the welding assembly of the sealing piece is mainly formed by spot welding an annular sealing piece A with an L-shaped cross section and an annular sealing piece B with a U-shaped cross section, wherein the annular sealing piece B is located in the inner ring of the annular sealing piece A, and the spot welding position is located at the long straight side of the L-shaped cross section of the annular sealing piece A and the straight side of the U-shaped cross section of the annular sealing piece B. The processing method comprises the following steps:

[0009] Step 1: respectively form a semi-finished annular sealing piece A with an L-shaped cross-section and a semi-finished annular sealing piece B with an L-shaped cross-section, wherein the long straight side of the L-shaped cross-section of the semi-finished annular sealing piece A corresponds to the inner ring end face of the ring, and the short straight side corresponds to an axial end face of the ring, and the long straight side of the L-shaped cross-section of the semi-finished annular sealing piece B corresponds to an axial end face of the ring, and the short straight side corresponds to the outer ring end face of the ring; it should be noted that the long straight side and the short straight side here refer to the relative lengths of the two straight sides in the L-shaped cross-section, the relatively longer straight side is the long straight side, and the relatively shorter straight side is the short straight side, for the convenience of understanding and description.

[0010] Step 2: Splice the semi-finished L-shaped cross-section annular sealing piece A and the semi-finished L-shaped cross-section annular sealing piece B obtained in step 1, the splicing position is the long straight side of the L-shaped cross-section of the semi-finished L-shaped cross-section of the annular sealing piece A and the short straight side of the L-shaped cross-section of the semi-finished L-shaped cross-section of the annular sealing piece B, and then send the long straight side and the short straight side together into the upper and lower electrodes of the spot welding machine to perform spot welding on the splicing surface to obtain a spot welding assembly;

[0011] Step 3: Flanging the spot welding assembly in step 2, positioning the joint surface where the spot welding is located, pressing the short straight side of the L-shaped cross section of the semi-finished annular sealing piece A in the spot welding assembly, and flanging the long straight side of the L-shaped cross section of the semi-finished annular sealing piece B by the relative movement of the punch and the die, to obtain the U-shaped cross section of the annular sealing piece B;

[0012] Step 4, removing the excess from the spot welding assembly after the flanging process in step 3, to obtain the final outer dimensions of the ultra-thin-wall high-temperature alloy sealing sheet welding assembly with a narrow U-shaped circular ring.

[0013] As a solution, in step 1, the height of the long straight side of the semi-finished L-shaped cross-section of the annular sealing piece A has an allowance relative to the final size, the height of the short straight side of the semi-finished L-shaped cross-section of the annular sealing piece B has an allowance relative to the final size, and the length of the long straight side has an allowance relative to the final size.

[0014] As a solution, in step 1, the short straight side and the long straight side of the L-shaped cross-section of the semi-finished annular sealing piece B are transitioned by an arc edge, and the radius of the arc edge is equal to the radius of the arc edge between the two straight edges in the U-shaped cross-section of the annular sealing piece B.

[0015] As a solution, in step 2, the long straight side end of the semi-finished L-shaped cross section of the annular sealing piece A is aligned with the short straight side end of the semi-finished L-shaped cross section of the annular sealing piece B and serves as a reference for subsequent spot welding.

[0016] As a solution, in step 3, the flanging die used for flanging processing includes:

[0017] A concave die and a convex die, wherein the concave die and the convex die are coaxially arranged, and an annular gap is formed between the inner profile of the concave die and the outer profile of the convex die, and the annular gap forms a flanging forming area of ​​the long straight edge of the L-shaped cross section of the semi-finished annular sealing piece B;

[0018] The gasket is an annular member, which is placed on the die and located outside the annular gap. There is an annular gap between the inner annular surface of the gasket and the inner profile surface of the die, which is used to insert and position the long straight edge of the L-shaped section of the semi-finished annular sealing piece A and the short straight edge of the L-shaped section of the semi-finished annular sealing piece B;

[0019] The pressing plate is an annular member, which is located above the pad and is used to press the short straight edge of the L-shaped cross-section of the semi-finished annular sealing piece A onto the pad.

[0020] Furthermore, the upper end surface of the die has a circle of annular protrusions, the inner ring surface of the annular protrusions forms the inner profile surface of the die, and an annular gap is formed between the outer ring surface of the annular protrusions and the inner ring surface of the pad.

[0021] As a solution, in step 4, referring to the parts drawing of the ultra-thin-wall high-temperature alloy sealing piece welding assembly with a narrow U-shaped circular ring, laser cutting is adopted to cut off the end margin of the long straight edge of the annular sealing piece A and the end margin of the two straight edges in the U-shaped section of the semi-finished annular sealing piece B based on the corresponding arc edge in the U-shaped cross-section of the semi-finished annular sealing piece B.

[0022] Compared with the prior art, the present invention proposes a processing method for a welding assembly of an ultra-thin-wall high-temperature alloy sealing piece with a narrow U-shaped circular ring. A scientific processing plan is obtained by reasonably designing a single-piece structure, and a simple mold structure is used to realize the processing of the welding assembly with a narrow U-shaped circular ring, thereby ensuring the welding quality of the sealing piece welding assembly, reducing the difficulty of single-piece processing, improving the processing efficiency and part quality of the entire welding assembly, and meeting the requirements of sealing and consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a welding assembly of an ultra-thin-wall high-temperature alloy sealing piece with a narrow U-shaped circular ring;

[0024] Figure 2 It is a schematic diagram of the structure of a semi-finished annular sealing piece B with an L-shaped cross section and a semi-finished annular sealing piece A with an L-shaped cross section;

[0025] Figure 3 It is a schematic diagram of the structure after the semi-finished product of the L-shaped cross-section annular sealing piece A and the semi-finished product of the L-shaped cross-section annular sealing piece B are spliced;

[0026] Figure 4 It is a schematic diagram of the flanging die;

[0027] Figure 5 It is a schematic diagram of the structure of the flanging parts;

[0028] In the figure, 1-lower template; 2-die; 3-pad; 4-pressing plate; 5-rubber plate; 6-punch; 7-upper template. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0030] against Figure 1 The ultra-thin-wall high-temperature alloy sealing piece welding assembly with a narrow U-shaped circular ring shown in the present invention has the following processing ideas: first, the assembly annular sealing piece A and the annular sealing piece B are respectively processed into different semi-finished circular rings, and then the spot welding process is completed according to the welding requirements, and finally the narrow U-shaped circular ring is processed by flanging to achieve the final surface requirements and dimensional accuracy.

[0031] (1) Determination of processing structure: According to the narrow opening U-shaped circular ring structure (U-shaped opening width 4.15mm) in the single piece (ring-shaped sealing piece B) of the sealing piece welding assembly, it is impossible to put the welding position between the upper and lower electrodes of the spot welding machine for pressure spot welding. Therefore, it is necessary to change the narrow opening U-shaped circular ring into an inner-flange L-shaped semi-finished product structure to facilitate spot welding operation and avoid the narrow opening U-shaped circular ring edge hindering the pressure welding of the upper and lower electrodes of the spot welding machine;

[0032] (2) Improvement of processing scheme: By changing the structural features of the single-piece annular sealing piece B, such as Figure 2 As shown, a 5mm machining allowance is left for the height of the welding surface of the changed single-piece annular sealing piece B, and a 5mm machining allowance is left for the height of the single-piece annular sealing piece A, so as to increase the reference and facilitate welding during assembly, and avoid uneven height end surfaces caused by uneven material flow of parts during flanging;

[0033] (3) Processing of semi-finished products: According to the welding processing plan and structure proposed by the sealing piece welding assembly, such as Figure 2, the single annular sealing piece A and the annular sealing piece B are temporarily processed independently into semi-finished products, wherein the annular sealing piece A is processed into an outer L-shaped cross-section circular ring semi-finished product with a height margin of 5mm, and the annular sealing piece B is processed into an inner L-shaped cross-section circular ring semi-finished product with a height margin of 5mm, and the long straight side of the inner L-shaped cross-section as the inner turning edge should have sufficient margin for processing the U-shaped opening. In the L-shaped cross-section, the two straight sides contain a transition arc that is consistent with the arc segment in the final U-shaped cross-section, such as Figure 2 ;

[0034] (4) Matching: According to the corresponding relationship between the number of single-piece welding requirements of the ultra-thin-wall high-temperature alloy sealing piece welding assembly with narrow U-shaped circular ring, the semi-finished single pieces corresponding to the required requirements are processed respectively, that is, the annular sealing piece A and the annular sealing piece B need to be processed in a matching manner;

[0035] (5) Assembly: According to the position relationship required for welding of the welding assembly, the matching semi-finished annular sealing piece pieces are assembled into semi-finished sealing piece assemblies. During assembly, the tooth misalignment and clearance of the parts shall be ensured to meet the requirements of the relevant documents. At the same time, the fit of the assembly welding surface shall be ensured. In this way, the welding quality of the assembly can be effectively guaranteed. Figure 3 , that is, the long straight edge of the semi-finished annular sealing piece A and the short straight edge of the semi-finished annular sealing piece B are assembled and fitted;

[0036] (6) Spot welding: Place the assembled position to be welded on the spot welding machine and pressurize it between the upper and lower electrodes to complete the spot welding process according to the welding technical requirements;

[0037] (7) Making the flanging mold: Figure 4 According to the shape and size of the semi-finished component after welding, the flanging mold is designed and manufactured. The mold is mainly composed of an upper mold plate 7, a lower mold plate 1, a die 2, a punch 6, a pad 3, a pressure plate 4 and a rubber plate 5. The upper mold plate 7, the lower mold plate 1, the die 2, the punch 6, the pad 3, the pressure plate 4 and the rubber plate 5 are all coaxially arranged annular parts, wherein the pressure plate 4 is mounted on the upper mold plate 7 through the rubber plate 5 and screws, and a punch 6 is installed in the inner ring space of the pressure plate 4 and the rubber plate 5. The upper end of the punch 6 is mounted on the upper mold plate 7 through screws, and the die 2 and the pad 3 are mounted on the lower mold plate 1 through screws, wherein the pad 3 and the die 2 are assembled through a circle of step surfaces, and the upper end surface of the die 2 has a circle of annular protrusions (corresponding to Figure 4 The inner surface of the annular protrusion is used as the flanging profile that cooperates with the outer surface of the punch 6. The shape of the inner surface of the annular protrusion is consistent with the inner contour of the U-shaped cross-section opening of the annular sealing piece B, including Figure 5The dimensions are R1.55, R3 and 18°. There is an annular gap between the outer annular surface of the annular protrusion and the inner annular surface of the backing plate 3, which is used to locate the welding surface after spot welding (that is, the long straight edge of the semi-finished annular sealing piece A and the short straight edge of the semi-finished annular sealing piece B are inserted into the annular gap for positioning after spot welding), and the lower end surface of the pressing plate 4 and the upper end surface of the backing plate 3 form a pressing area for the short straight edge of the semi-finished annular sealing piece A, and the gap between the outer surface of the punch 6 and the inner surface of the annular protrusion on the die 2 forms a space area of ​​the flanged U-shaped surface;

[0038] (8) Flanging U-shaped surface: Place the welding surface of the semi-finished sealing sheet welding assembly into the positioning groove between the flanging mold die 2 and the backing plate 3 ( Figure 4 In the flanged positioning position), the short straight edge of the semi-finished annular sealing piece A is pressed and fixed by the pressing plate 4, and then the punch 6 is driven down by the upper template 7 to form the long straight edge of the L-shaped cross section of the semi-finished annular sealing piece B, and the narrow opening U-shaped surface of the flange is formed. Figure 5 ;

[0039] (9) Final size of processed parts: according to Figure 1 The final ultra-thin-wall high-temperature alloy sealing piece welding assembly with narrow U-shaped ring is obtained by removing the excess from the part size. Figure 1 Medium size, Figure 5 The semi-finished product in the cutting is cut by using a laser cutting machine. Based on the corresponding arc edge (R1.55) in the U-shaped section of the semi-finished ring sealing piece B, the end margin of the long straight edge of the ring sealing piece A is cut off (corresponding to Figure 5 Medium size 11 to Figure 1 6) and the end margins of the two straight edges in the U-shaped section of the semi-finished annular sealing piece B (corresponding to Figure 5 Medium size 11 to Figure 1 Medium size 6, and Figure 5 The left end of R3 to Figure 1 Dimensions 7.2 and 2.45).

[0040] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. Although the illustrative specific embodiments of the present invention are described above to facilitate the understanding of the present invention by the technical personnel in the field, it should be clear that the present invention is not limited to the scope of the specific embodiments. For ordinary technicians in the field of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A processing method for a welding assembly of an ultra-thin-wall high-temperature alloy sealing piece with a narrow U-shaped circular ring, wherein the welding assembly of the sealing piece is mainly formed by spot welding an annular sealing piece A with an L-shaped cross section and an annular sealing piece B with a U-shaped cross section, the annular sealing piece B is located in the inner ring of the annular sealing piece A, and the spot welding position is located at the long straight side of the L-shaped cross section of the annular sealing piece A and the straight side of the U-shaped cross section of the annular sealing piece B, characterized in that: The processing method comprises the following steps: Step 1: respectively forming a semi-finished annular sealing piece A with an L-shaped cross section and a semi-finished annular sealing piece B with an L-shaped cross section, wherein the long straight side of the L-shaped cross section of the semi-finished annular sealing piece A corresponds to the inner ring end face of the ring, and the short straight side corresponds to an axial end face of the ring, and the long straight side of the L-shaped cross section of the semi-finished annular sealing piece B corresponds to an axial end face of the ring, and the short straight side corresponds to the outer ring end face of the ring; Step 2: Splice the semi-finished L-shaped cross-section annular sealing piece A and the semi-finished L-shaped cross-section annular sealing piece B obtained in step 1, the splicing position is the long straight side of the L-shaped cross-section of the semi-finished L-shaped cross-section of the annular sealing piece A and the short straight side of the L-shaped cross-section of the semi-finished L-shaped cross-section of the annular sealing piece B, and then send the long straight side and the short straight side together into the upper and lower electrodes of the spot welding machine to perform spot welding on the splicing surface to obtain a spot welding assembly; Step 3: Flanging the spot welding assembly in step 2, positioning the joint surface where the spot welding is located, pressing the short straight side of the L-shaped cross section of the semi-finished annular sealing piece A in the spot welding assembly, and flanging the long straight side of the L-shaped cross section of the semi-finished annular sealing piece B by the relative movement of the punch and the die, to obtain the U-shaped cross section of the annular sealing piece B; Step 4, removing the excess from the spot welding assembly after the flanging process in step 3, to obtain the final outer dimensions of the ultra-thin-wall high-temperature alloy sealing sheet welding assembly with a narrow U-shaped circular ring.

2. The method for processing a welding assembly of an ultra-thin-wall high-temperature alloy sealing sheet with a narrow U-shaped circular ring according to claim 1, characterized in that: In step 1, the height of the long straight side of the semi-finished L-shaped cross-section of the annular sealing piece A has a margin relative to the final size, the height of the short straight side of the semi-finished L-shaped cross-section of the annular sealing piece B has a margin relative to the final size, and the length of the long straight side has a margin relative to the final size.

3. The method for processing a welding assembly of an ultra-thin-wall high-temperature alloy sealing sheet with a narrow U-shaped circular ring according to claim 1 is characterized in that: In step 1, the short straight side and the long straight side of the L-shaped cross section of the semi-finished annular sealing piece B are transitioned by an arc edge, and the radius of the arc edge is equal to the radius of the arc edge between the two straight sides in the U-shaped cross section of the annular sealing piece B.

4. The method for processing a welding assembly of an ultra-thin-wall high-temperature alloy sealing sheet with a narrow U-shaped circular ring according to claim 1 is characterized in that: In step 2, the long straight side end of the L-shaped cross section of the semi-finished product of the annular sealing piece A is aligned with the short straight side end of the L-shaped cross section of the semi-finished product of the annular sealing piece B and serves as a reference for subsequent spot welding.

5. The method for processing a welding assembly of an ultra-thin-wall high-temperature alloy sealing sheet with a narrow U-shaped circular ring according to claim 1, characterized in that: In step 3, the flanging die used in the flanging process includes: A concave die and a convex die, wherein the concave die and the convex die are coaxially arranged, and an annular gap is formed between the inner profile of the concave die and the outer profile of the convex die, and the annular gap forms a flanging forming area of ​​the long straight edge of the L-shaped cross section of the semi-finished annular sealing piece B; The gasket is an annular member, which is placed on the die and located outside the annular gap. There is an annular gap between the inner annular surface of the gasket and the inner profile surface of the die, which is used to insert and position the long straight edge of the L-shaped section of the semi-finished annular sealing piece A and the short straight edge of the L-shaped section of the semi-finished annular sealing piece B; The pressing plate is an annular member, which is located above the pad and is used to press the short straight edge of the L-shaped cross-section of the semi-finished annular sealing piece A onto the pad.

6. The method for processing a welding assembly of an ultra-thin-wall high-temperature alloy sealing sheet with a narrow U-shaped circular ring according to claim 5, characterized in that: The upper end surface of the die is provided with a circle of annular protrusions, the inner ring surface of the annular protrusions forms the inner profile surface of the die, and a circle of annular gaps is formed between the outer ring surface of the annular protrusions and the inner ring surface of the pad.

7. The method for processing a welding assembly of an ultra-thin-wall high-temperature alloy sealing sheet with a narrow U-shaped circular ring according to claim 1, characterized in that: In the step 4, referring to the parts drawing of the ultra-thin-wall high-temperature alloy sealing piece welding assembly with a narrow U-shaped circular ring, laser cutting is adopted to cut off the end margin of the long straight edge of the annular sealing piece A and the end margin of the two straight edges in the U-shaped cross-section of the semi-finished annular sealing piece B based on the corresponding arc edge in the U-shaped cross-section of the semi-finished annular sealing piece B.

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