A processing method for a welding assembly of an ultra-thin-wall high-temperature alloy sealing piece with a narrow U-shaped ring

Abstract

The present invention discloses a processing method for a welding assembly of an ultra-thin-walled high-temperature alloy sealing piece with a narrow U-shaped circular ring. First, a semi-finished circular sealing piece A with an L-shaped cross section and a semi-finished circular sealing piece B with an L-shaped cross section are formed respectively. Then, the welding surfaces of the two are aligned and assembled, and then spot welding is performed. Then, the welding surface is positioned, one edge of the semi-finished circular sealing piece A is pressed, and one edge of the semi-finished circular sealing piece B is flanging to obtain the final U-shaped surface. The excess amount is cut according to the part drawing to obtain the final size. The processing method of the present invention can solve the problem that the spot welding electrode cannot directly weld the U-shaped opening, ensure the surface consistency of the narrow U-shaped circular ring ultra-thin-walled high-temperature alloy sealing piece welding assembly, meet the design requirements of dimensional accuracy, and ensure compliance with the sealing and consistency requirements.

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 piece 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, material thickness of 0.25mm, height of 6mm, outer diameter of 666.1mm, and outward flange of 2.35mm; Annular sealing piece B is a circular ring with a narrow opening and a U-shaped cross-section, material thickness of 0.25mm, height of 7.2mm, outer diameter of 665.35mm, and 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 initially assembled and welded using the processed annular sealing piece A and annular sealing piece B, 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 option is for the fitter to shrink the edges of the U-shaped ring that are not required for spot welding inward 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 assembly, and local dimensions are difficult to guarantee, making it impossible to seal in the assembly of the upper-level large assembly.

[0004] Based on the above reasons, it is necessary to propose a processing method for welding components of ultra-thin-walled high-temperature alloy sealing sheets with narrow U-shaped rings 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, 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 the narrow U-shaped surface to meet the quality requirements of the part size and shape accuracy.

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

[0008] A method for processing a welding assembly of an ultra-thin-walled high-temperature alloy sealing piece with a narrow U-shaped circular ring, wherein the sealing piece welding assembly 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 edge of the L-shaped cross section of the annular sealing piece A and the straight edge of the U-shaped cross section of the annular sealing piece B. The processing method comprises the following steps:

[0009] Step 1: Separately 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; 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 annular sealing piece A and the semi-finished L-shaped annular sealing piece B obtained in step 1. The splicing position is the long straight edge of the L-shaped cross-section of the semi-finished annular sealing piece A and the short straight edge of the L-shaped cross-section of the semi-finished annular sealing piece B. Then, the long straight edge and the short straight edge are sent together between the upper and lower electrodes of the spot welding machine to perform spot welding on the spliced ​​surfaces to obtain a spot welded assembly.

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

[0012] Step 4: performing a residual removal process on the spot-welded assembly after the flanging process in step 3 to obtain the final outer dimensions of the welded assembly with the ultra-thin-wall high-temperature alloy sealing sheet 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 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.

[0014] As a solution, in step 1, the short straight side and the long straight side of the semi-finished L-shaped cross-section of the 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.

[0015] As a solution, in step 2, the long straight side end of the L-shaped section of the semi-finished annular sealing piece A is aligned with the short straight side end of the L-shaped section of the semi-finished 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 the flanging process includes:

[0017] A die and a punch, the die and the punch being coaxially arranged, with an annular gap between the inner profile of the die and the outer profile of the punch, the annular gap forming a flanging forming area for the long straight side of the L-shaped cross-section of the semi-finished annular sealing piece B;

[0018] The backing plate is an annular member placed on the die and located outside the annular gap. There is an annular gap between the inner annular surface of the backing plate and the inner profile surface of the die for inserting and positioning the long straight edge of the L-shaped cross-section of the semi-finished annular sealing piece A and the short straight edge of the L-shaped cross-section of the semi-finished annular sealing piece B.

[0019] The pressing plate is an annular part, 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 annular surface of the annular protrusions forms the inner profile surface of the die, and an annular gap is formed between the outer annular surface of the annular protrusions and the inner annular surface of the pad.

[0021] As a solution, in step 4, referring to the parts drawing of the ultra-thin-walled high-temperature alloy sealing piece welding assembly with a narrow U-shaped circular ring, laser cutting is used 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 section of the semi-finished annular sealing piece B.

[0022] Compared with the existing technology, the present invention proposes a processing method for a welding assembly of an ultra-thin-walled high-temperature alloy sealing piece with a narrow U-shaped circular ring. A scientific processing plan is obtained by rationally designing the 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 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 Schematic diagram of the structure of the semi-finished L-shaped cross-section annular sealing piece B and the semi-finished L-shaped cross-section annular sealing piece A;

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

[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 with reference to the accompanying drawings and specific embodiments. However, 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 technical ideas of the present invention, various modifications, substitutions and changes made according to 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 parts 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 (annular 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 during assembly and facilitate welding, and to avoid uneven height end surfaces caused by uneven material flow during flanging;

[0033] (3) Processing of semi-finished products: Based on 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. The long straight side of the inner L-shaped cross-section should be used as an inner flange to leave enough 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 product single pieces corresponding to the 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: Assemble the matching semi-finished annular sealing pieces into semi-finished sealing piece assemblies according to the position relationship required for welding of the welding assembly. During assembly, ensure that the teeth and gaps of the parts meet the requirements of the relevant documents. At the same time, ensure the fit of the assembly welding surface, so that the welding quality of the assembly can be effectively guaranteed. Figure 3 , that is, the long straight side of the semi-finished annular sealing piece A and the short straight side of the semi-finished annular sealing piece B are assembled and fitted;

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

[0037] (7) Make 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 template 7, a lower template 1, a die 2, a punch 6, a pad 3, a pressure plate 4 and a rubber plate 5. The upper template 7, the lower template 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 template 7 through the rubber plate 5 and screws. The 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 template 7 by screws, and the die 2 and the pad 3 are mounted on the lower template 1 by screws. 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 flange surface for cooperating 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°. An annular gap is formed between the outer surface of the annular protrusion and the inner surface of the backing plate 3, which is used to position the weld surface after spot welding (i.e., 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 this annular gap for positioning after spot welding). The lower end surface of the pressure 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. The gap between the outer surface of the punch 6 and the inner surface of the annular protrusion on the die 2 forms the spatial area of ​​the flanged U-shaped surface.

[0038] (8) Flanging U-shaped surface: Place the welding surface of the semi-finished sealing piece welding assembly into the positioning groove between the flanging mold die 2 and the pad 3 ( Figure 4 In the flange positioning position), the short straight edge of the semi-finished annular sealing piece A is pressed and fixed with 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 allowance from the part size. Specifically, refer to Figure 1 Medium size, right Figure 5 The semi-finished product is cut by a laser cutting machine. The corresponding arc edge (R1.55) in the U-shaped section of the semi-finished product of the annular sealing piece B is used as the reference to cut off the end margin of the long straight edge of the annular sealing piece A (corresponding to Figure 5 Medium size 11 to Figure 1 6) and the end allowance 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 Sizes 7.2 and 2.45).

[0040] Any matters not described in detail in the present specification are prior art known to those skilled in the art. Although the above description of the present invention is based on illustrative embodiments to facilitate understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the specific embodiments. As long as various modifications are within the spirit and scope of the present invention as defined and determined by the appended claims, such modifications will be obvious to those skilled in the art, and all inventions and creations utilizing the concepts of the present invention are protected.

Claims

1. A method for processing a welding assembly of an ultra-thin-walled high-temperature alloy sealing piece with a narrow U-shaped circular ring, wherein the sealing piece welding assembly 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 edge of the L-shaped cross section of the annular sealing piece A and the straight edge of the U-shaped cross section of the annular sealing piece B, characterized in that: The processing method comprises the following steps: Step 1: Separately 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 end face of the ring, and the short straight side corresponds to one axial end face of the ring; the long straight side of the L-shaped cross-section of the semi-finished annular sealing piece B corresponds to one axial end face of the ring, and the short straight side corresponds to the outer end face of the ring; Step 2: Splice the semi-finished L-shaped annular sealing piece A and the semi-finished L-shaped annular sealing piece B obtained in step 1. The splicing position is the long straight edge of the L-shaped cross-section of the semi-finished annular sealing piece A and the short straight edge of the L-shaped cross-section of the semi-finished annular sealing piece B. Then, the long straight edge and the short straight edge are sent together between the upper and lower electrodes of the spot welding machine to perform spot welding on the spliced ​​surfaces to obtain a spot welded assembly. Step 3: Flanging the spot-welded assembly in step 2, positioning the spot-welded joint surface, pressing the short straight side of the L-shaped section of the semi-finished annular sealing piece A in the spot-welded assembly, and flanging the long straight side of the L-shaped section of the semi-finished annular sealing piece B using the relative movement of the punch and die to obtain the U-shaped section of the annular sealing piece B; Step 4: performing a residual removal process on the spot-welded assembly after the flanging process in step 3 to obtain the final outer dimensions of the welded assembly with the ultra-thin-wall high-temperature alloy sealing sheet with a narrow U-shaped circular ring.

2. The method for processing a welding assembly of an ultra-thin-walled 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-walled high-temperature alloy sealing sheet with a narrow U-shaped circular ring according to claim 1, 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 through 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-walled high-temperature alloy sealing sheet with a narrow U-shaped circular ring according to claim 1, characterized in that: In step 2, the long straight side end of the L-shaped section of the semi-finished annular sealing piece A is aligned with the short straight side end of the L-shaped section of the semi-finished 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-walled 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 for the flanging process includes: A die and a punch, the die and the punch being coaxially arranged, with an annular gap between the inner profile of the die and the outer profile of the punch, the annular gap forming a flanging forming area for the long straight side of the L-shaped cross-section of the semi-finished annular sealing piece B; The backing plate is an annular member placed on the die and located outside the annular gap. There is an annular gap between the inner annular surface of the backing plate and the inner profile surface of the die for inserting and positioning the long straight edge of the L-shaped cross-section of the semi-finished annular sealing piece A and the short straight edge of the L-shaped cross-section of the semi-finished annular sealing piece B. The pressing plate is an annular part, 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-walled 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 annular surface of the annular protrusions forms the inner profile surface of the die, and an annular gap is formed between the outer annular surface of the annular protrusions and the inner annular surface of the pad.

7. The method for processing a welding assembly of an ultra-thin-walled high-temperature alloy sealing sheet with a narrow U-shaped circular ring according to claim 1, characterized in that: In step 4, referring to the parts drawing of the ultra-thin-walled high-temperature alloy sealing piece welding assembly with a narrow U-shaped circular ring, laser cutting is used 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.

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