Working method of a spinning fixture for an exhaust diffuser

Abstract

The present invention relates to a working method of a spinning fixture for an exhaust diffuser. The spinning fixture for the exhaust diffuser includes a base, a connecting ring, a supporting ring, a pressing plate, a spinning ring and a positioning ring. The base includes a disc-shaped base and a supporting cylinder, and the outer diameter of the supporting cylinder is adapted to the inner diameter of the thin-walled cylinder body; the connecting ring is sleeved on the supporting cylinder, and the tail end of the connecting ring is fixedly connected to the disc-shaped base of the base; the supporting ring is sleeved on the supporting cylinder, and the tail end of the supporting ring is connected to the front end of the connecting ring through an adjusting bolt; the spinning ring includes a left half-ring and a right half-ring which are symmetrically arranged. The left half-ring / right half-ring includes an integrally formed spinning ring supporting part and a stepped part. The length of the stepped part along the axial direction is adapted to the length of the flanging welding part. A chamfering part adapted to the shape of the bending part is arranged at the junction of the front end face of the annular stepped part and the inner ring; the positioning ring is sleeved on the outer ring formed by the spinning supporting parts of the left half-ring and the right half-ring.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine part processing, in particular to a spinning fixture for an exhaust diffuser and its working method. Background Art

[0002] A certain type of exhaust diffuser is formed by combining and welding a sheet metal with a thickness of 0.6 - 1 mm after deep drawing and bulging. Since all are thin sheet parts, it is difficult to control the welding deformation. During the trial production process, many problems are encountered, and the spinning forming of the parts is a difficult point. Therefore, the requirements for the tooling are very high, and the tooling is required to have sufficient supporting force. As Figure 1 and Figure 2 shown, the part is composed of a thin-walled cylinder 1 and a flanging 2; the flanging 2 successively includes a welding part 23 that is tightly fitted with the outer wall of the front end of the thin-walled cylinder 1, a transition part 22 with a gap between the outer wall of the thin-walled cylinder 1, and a folding part 21 that is vertically arranged outward along the transition part. During processing, the front end of the thin-walled cylinder 1 is welded and fixed to the welding part 23, and then the front ends of the thin-walled cylinder 1 and the welding part 23 are turned outward to form a bending part 24 with a certain bending radius; this bending part 24 is spun outward, and the diameter of the tail end of the thin-walled cylinder 1 is larger than the diameter at the spinning position. If an integral support block is used, it will directly cause the part to be unable to be disassembled from the fixture. To sum up, the fixture must adopt a split structure to meet the disassembly of the spun part. However, after splitting, the support ring is only fixed by screws, and the generated supporting force cannot meet the requirements of part spinning. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a spinning fixture for an exhaust diffuser with a simple structure and easy assembly and its working method.

[0004] To solve the above technical problems, the spinning fixture for the exhaust diffuser provided by the present invention includes a base, a connecting ring, a supporting ring, a pressing plate, a spinning ring and a positioning ring. The base includes a disc-shaped base and a supporting cylinder. The tail end of the supporting cylinder is fixedly connected to the end face of the disc-shaped base, and the outer diameter of the supporting cylinder is adapted to the inner diameter of the thin-walled cylinder. The connecting ring is sleeved on the supporting cylinder, and the tail end of the connecting ring is fixedly connected to the disc-shaped base of the base. There is a gap between the inner wall of the connecting ring and the outer wall of the supporting cylinder. The supporting ring is sleeved on the supporting cylinder, and the tail end of the supporting ring is connected to the front end of the connecting ring through an adjusting bolt. There is a gap between the inner wall of the supporting ring and the outer wall of the supporting cylinder, and the outer diameter of the supporting ring is set to be smaller than the outer diameter of the connecting ring. One end of the pressing plate is connected to the front end of the connecting ring through a bolt, and the other end of the pressing plate is in press-fit with the front end face of the supporting ring. The spinning ring includes a left half-ring and a right half-ring symmetrically arranged. The left half-ring / right half-ring includes an integrally formed spinning ring supporting part and a stepped part. The length of the stepped part along the axial direction is adapted to the length of the flanging welding part. After the left half-ring and the right half-ring form the spinning ring, there is a clearance fit between the inner ring formed by the stepped parts of the left half-ring and the right half-ring and the outer wall of the supporting cylinder. A chamfering part adapted to the shape of the bending part is arranged at the junction of the front end face of the stepped part and the inner ring. The positioning ring is sleeved on the outer ring formed by the spinning ring supporting parts of the left half-ring and the right half-ring for fixedly supporting the spinning ring.

[0005] Further, the axial length of the supporting cylinder is adapted to the axial depth of the thin-walled cylinder, so that when the thin-walled cylinder is sleeved outside the supporting cylinder, the front end of the thin-walled cylinder and the welding part are placed at the front edge of the supporting cylinder, facilitating the outward folding of the front ends of the thin-walled cylinder and the welding part for spinning.

[0006] Further, the spinning fixture for the exhaust diffuser further includes a plurality of cushion blocks, which are placed between the connecting ring and the spinning ring for supporting and limiting the position of the spinning ring, avoiding the displacement of the spinning ring caused by extrusion during the spinning process and affecting the machining dimensional accuracy.

[0007] Further, the left half-ring and the right half-ring are obtained by evenly dividing the same ring body by wire cutting into two halves, so that the connection between the obtained left half-ring and right half-ring is tight and there will be no fault, avoiding the problem of local depression when the part is spun. After the spinning is completed, first separate the spinning ring divided into two halves, and then the part can be smoothly disassembled from the fixture, which is easy to disassemble.

[0008] Further, a detachable inlay ring is arranged on the outer wall of the front end of the supporting cylinder along the circumferential direction. After the thin-walled cylinder is sleeved into the supporting cylinder, only the inlay ring is in contact with the inner wall of the thin-walled cylinder. After the spinning fixture for the exhaust diffuser is used multiple times and the size deviation is caused by wear, only the inlay ring needs to be replaced, avoiding replacing the entire base and saving costs.

[0009] Furthermore, the supporting cylinder and the disc-shaped base are hollow to reduce the overall weight of the fixture and lower the manufacturing cost.

[0010] The working method of the above-mentioned spinning fixture for the exhaust diffuser includes the following steps:

[0011] A. First, insert the welded thin-walled cylinder and the flanging into the supporting cylinder of the base, so that the tail end of the thin-walled cylinder is supported by the disc-shaped base, and the front end of the thin-walled cylinder and the welded part of the flanging are placed at the front edge of the supporting cylinder.

[0012] B. Put the connecting ring on the outside of the thin-walled cylinder and fixedly connect the tail end of the connecting ring to the disc-shaped base of the base, so that the thin-walled cylinder is placed in the gap between the connecting ring and the supporting cylinder.

[0013] C. Put the supporting ring on the outside of the thin-walled cylinder and connect the supporting ring to the connecting ring through an adjusting bolt, so that the folded part of the flanging is tightly attached to the front end face of the supporting ring. Set pressure plates at 0°, 90°, 180°, and 270° of the connecting ring. One end of each pressure plate is fixedly connected to the connecting ring, and the opposite end presses the folded part of the flanging against the front end face of the supporting ring.

[0014] D. Clamp the left half-ring and the right half-ring at the front end of the thin-walled cylinder to form a spinning ring, so that the inner ring formed by the stepped parts of the left half-ring and the right half-ring limits and fixes the front end of the thin-walled cylinder and the welded part of the flanging. The area to be spun is placed at the chamfered part of the spinning ring. Set pads at 45°, 135°, 225°, and 315° of the connecting ring to limit the axial distance between the spinning ring and the connecting ring and position the spinning ring. Sleeve the positioning ring on the outer ring of the spinning ring and fixedly connect the positioning ring, the spinning ring, the pads and the front end face of the connecting ring through bolts to complete the clamping of the spinning fixture for the exhaust diffuser and the parts.

[0015] E. Drive the spinning fixture for the exhaust diffuser after clamping in cooperation with the power system, so that the spinning fixture for the exhaust diffuser and the parts remain in a rotating state. Insert the spinning wheel for spinning into the positioning ring, so that the spinning wheel spins the front ends of the thin-walled cylinder and the flanging along the chamfered part to obtain a part with a bent part.

[0016] Technical effects of the invention: (1) For the spinning fixture for the exhaust diffuser of the present invention, compared with the prior art, the spinning ring adopts a split design, which is easy to assemble and disassemble; (2) Pads are arranged between the connecting ring and the spinning ring to prevent the spinning ring from shifting during the spinning process and affecting the processing accuracy; (3) The left half-ring and the right half-ring are obtained by evenly dividing the same ring body into two halves by wire cutting, so that the gap between the left half-ring and the right half-ring after assembly is small, there will be no fault, and the problem of local depression during part spinning is avoided; (4) The setting of the inlay ring can reduce the processing cost and extend the overall service life of the fixture. Brief Description of the Drawings

[0017] The present invention will be further described in detail below with reference to the accompanying drawings of the specification:

[0018] Figure 1 is a schematic cross-sectional structure diagram after the thin-walled cylinder body and flanging of the exhaust diffuser of the present invention are welded;

[0019] Figure 2 is Figure 1 a partial enlarged view of area A in

[0020] Figure 3 is a front view of the spinning fixture of the exhaust diffuser of the present invention and the parts after being clamped;

[0021] Figure 4 is Figure 3 a cross-sectional view taken along the A-A direction in

[0022] Figure 5 is Figure 4 a partial enlarged view of area B in

[0023] Figure 6 is a schematic cross-sectional structure diagram of the base of the present invention;

[0024] Figure 7 is a schematic structure diagram of the left half-ring of the present invention;

[0025] Figure 8 is Figure 7 a partial enlarged view of area C in

[0026] In the figure: thin-walled cylinder body 1, flanging 2, folding part 21, transition part 22, welding part 23, bending part 24, base 3, supporting cylinder 31, disc-shaped base 32, inlay ring 33, connecting ring 4, support ring 5, adjusting bolt 51, pressing plate 6, spinning ring 7, step part 71, spinning ring support part 72, chamfer part 73, spacer 8, positioning ring 9. Detailed Description of the Preferred Embodiments

[0027] Embodiment 1

[0028] As Figures 3 to 6As shown in the figure, the spinning fixture of the exhaust diffuser in this embodiment includes a base 3, a connecting ring 4, a support ring 5, a pressing plate 6, a spinning ring 7 and a positioning ring 9. The base 3 includes a disc-shaped base 32 and a supporting cylinder 31. The tail end of the supporting cylinder 31 is fixedly connected to the end face of the disc-shaped base 32. The outer diameter of the supporting cylinder 31 is adapted to the inner diameter of the thin-walled cylinder 1, and the axial length of the supporting cylinder 31 is adapted to the axial depth of the thin-walled cylinder 1. When the thin-walled cylinder 1 is sleeved outside the supporting cylinder 31, the front end and the welding part 23 of the thin-walled cylinder 1 are placed at the front edge of the supporting cylinder 31. An inlay ring 33 that is threadedly connected to the supporting cylinder 31 is arranged circumferentially on the outer wall of the front end of the supporting cylinder 31. After the thin-walled cylinder 1 is sleeved into the supporting cylinder 31, only the inlay ring 33 contacts the inner wall of the thin-walled cylinder 1. The supporting cylinder 31 and the disc-shaped base 32 are hollow to reduce the overall weight of the fixture.

[0029] When the connecting ring 4 is sleeved on the supporting cylinder 31, the tail end of the connecting ring 4 is fixedly connected to the disc-shaped base 32 of the base 3 through two symmetrically arranged bolts, and there is a gap between the inner wall of the connecting ring 4 and the outer wall of the supporting cylinder 31. The support ring 5 is sleeved on the supporting cylinder 31, and the tail end of the support ring 5 is connected to the front end of the connecting ring 4 through two symmetrically arranged adjusting bolts 51, so that by adjusting the adjusting bolts 51, the position of the support ring 5 can be changed. There is a gap between the inner wall of the support ring 5 and the outer wall of the supporting cylinder 31, and the outer diameter of the support ring 5 is set to be smaller than the outer diameter of the connecting ring 4, so that the pressing plate 6 and the cushion block 8 can be arranged on the outer side of the edge of the support ring 5. The pressing plates 6 are arranged at 0°, 90°, 180°, and 270° of the connecting ring 4. One end of each pressing plate 6 is fixedly connected to the connecting ring 4 through a bolt, and the opposite end presses the folded part 21 of the flanging 2 against the front end face of the support ring 5.

[0030] The spinning ring 7 includes a symmetrically arranged left half-ring and right half-ring. The left half-ring and the right half-ring are obtained by evenly dividing the same ring body into two halves by wire cutting, so that the connection between the obtained left half-ring and right half-ring is tight and there will be no fault; as Figure 7 and Figure 8 shown, both the left half-ring / right half-ring include an integrally formed spinning ring support part 72 and a step part 71. The axial length of the step part 71 is adapted to the length of the flanging welding part 23. After the left half-ring and the right half-ring form the spinning ring 7, there is a clearance fit between the inner ring formed by the step parts 71 of the left half-ring and the right half-ring and the outer wall of the supporting cylinder 31. A chamfer part 73 that is adapted to the shape of the bending part 24 is arranged at the junction of the front end face of the step part 71 and the inner ring for processing the bending part 24. The cushion blocks 8 are arranged at 45°, 135°, 225°, and 315° of the connecting ring 4 to limit the axial distance between the spinning ring 7 and the connecting ring 4. The positioning ring 9 is sleeved on the outer ring formed by the spinning ring support parts 72 of the left half-ring and the right half-ring, and the positioning ring 9, the spinning ring 7, the cushion blocks 8 and the front end face of the connecting ring 4 are fixedly connected through bolts to complete the clamping.

[0031] Example 2

[0032] The working method of the above exhaust diffuser spinning fixture specifically includes the following steps:

[0033] A. First, the welded thin-walled cylinder 1 and the flanging 2 are sleeved on the supporting cylinder 31 of the base 3, so that the tail end of the thin-walled cylinder 1 is supported by the disc-shaped base 32, and the welded part 23 at the front end of the thin-walled cylinder 1 and the flanging 2 is placed at the front edge of the supporting cylinder 31.

[0034] B. The connecting ring 4 is sleeved outside the thin-walled cylinder 1, and the tail end of the connecting ring 4 is fixedly connected to the disc-shaped base 32 of the base 3, so that the thin-walled cylinder 1 is placed in the gap between the connecting ring 4 and the supporting cylinder 31.

[0035] C. The supporting ring 5 is sleeved outside the thin-walled cylinder 1, and the supporting ring 5 is connected to the connecting ring 4 through the adjusting bolt 51, so that the folded part 21 of the flanging 2 is tightly attached to the front end face of the supporting ring 5. Pressure plates 6 are arranged at 0°, 90°, 180°, and 270° of the connecting ring 4. One end of each pressure plate 6 is fixedly connected to the connecting ring 4 through a bolt, and the folded part 21 of the flanging 2 is pressed against the front end face of the supporting ring 5 at the opposite end.

[0036] D. The left half-ring and the right half-ring are clamped at the front end of the thin-walled cylinder 1 to form a spinning ring 7, so that the inner ring formed by the stepped parts 71 of the left half-ring and the right half-ring limits and fixes the front end of the thin-walled cylinder 1 and the welded part 23 of the flanging 2. The area to be spun is placed at the chamfer part 73 of the spinning ring 7. Blocks 8 are arranged at 45°, 135°, 225°, and 315° of the connecting ring 4 to limit the axial distance between the spinning ring 7 and the connecting ring 4 and limit the spinning ring 7. The positioning ring 9 is sleeved on the outer ring of the spinning ring 7, and the positioning ring 9, the spinning ring 7, the blocks 8 and the front end face of the connecting ring 4 are fixedly connected through bolts to complete the clamping of the exhaust diffuser spinning fixture and the parts.

[0037] E. The clamped exhaust diffuser spinning fixture is in transmission cooperation with the power system (such as the rotating shaft on a lathe), so that the exhaust diffuser spinning fixture and the parts are in a rotating state. The spinning wheel for spinning is inserted into the positioning ring 9, so that the spinning wheel spins the front ends of the thin-walled cylinder 1 and the flanging 2 along the chamfer part 73 to obtain a part with a bent part 24.

[0038] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And these obvious changes or alterations derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A working method of a spinning fixture for an exhaust diffuser, characterized in that It includes the following steps: A. First, insert the welded thin-walled cylinder body and the flanging into the supporting cylinder of the base, so that the tail end of the thin-walled cylinder body is supported by the disc-shaped base, and the front end of the thin-walled cylinder body and the welded part of the flanging are placed at the front edge of the supporting cylinder; B. Put the connecting ring on the outside of the thin-walled cylinder body and fixedly connect the tail end of the connecting ring to the disc-shaped base of the base, so that the thin-walled cylinder body is placed in the gap between the connecting ring and the supporting cylinder; C. Put the supporting ring on the outside of the thin-walled cylinder body and connect the supporting ring to the connecting ring through an adjusting bolt, so that the folded part of the flanging is tightly arranged against the front end face of the supporting ring. Pressing plates are arranged at 0°, 90°, 180°, and 270° of the connecting ring. One end of each pressing plate is fixedly connected to the connecting ring, and the folded part of the flanging is pressed against the front end face of the supporting ring at the opposite end; D. Clamp the left half ring and the right half ring at the front end of the thin-walled cylinder body to form a spinning ring, so that the inner ring formed by the stepped parts of the left half ring and the right half ring limits and fixes the front end of the thin-walled cylinder body and the welded part of the flanging. The area to be spun is placed at the chamfered part of the spinning ring. Spacers are arranged at 45°, 135°, 225°, and 315° of the connecting ring to limit the axial distance between the spinning ring and the connecting ring and position the spinning ring. Sleeve the positioning ring on the outer ring of the spinning ring, and fixedly connect the positioning ring, the spinning ring, the spacer, and the front end face of the connecting ring through bolts to complete the clamping of the exhaust diffuser spinning fixture and the parts; E. Transmissionally cooperate the clamped exhaust diffuser spinning fixture with the power system, so that the exhaust diffuser spinning fixture and the parts remain in a rotating state. Insert the spinning wheel for spinning into the positioning ring, so that the spinning wheel spins the front ends of the thin-walled cylinder body and the flanging along the chamfered part to obtain a part with a bent part.

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