A processing device and method of a large-size variable cross-section sheet metal cylinder with a flange

Abstract

The application discloses a processing device and method for a large-size variable cross-section sheet metal cylinder with a flange, and the processing device comprises a lower die plate, a top plate, a cone, an outer ring, an expansion block, a first female die, a second female die, a third female die, an upper gasket, an upper die plate, a pull rod, a discharging screw, a guide plate and a lower gasket. During processing, a conical blank is used, and the blank is formed in two times after a notch is cut at the small-diameter end of the blank. In the first forming, the upper gasket is placed between the third female die and the expansion block to realize preliminary bending of the flange and profile characteristics of the outer containment passage partition plate. In the second forming, the upper gasket is placed between the third female die and the upper die plate to realize full profile forming of the flange. Then, the third female die is moved upward, the first female die and the second female die are disassembled, and the blank can be discharged. Finally, the notch and the hole on the outer containment passage partition plate are cut. The application can complete forming on a set of devices, and the forming is reliable and effective. The forming period is short, the efficiency is high, and the size precision and consistency of the part can be effectively ensured.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine processing technology, specifically relating to a processing device and method for a large-size variable cross-section sheet metal cylinder with flanges. Background Technology

[0002] The outer bypass channel baffle is a key component of the mixer assembly in an aero-engine, and its structure is as follows: Figure 1 As shown, this is a large-sized variable cross-section sheet metal cylindrical part with a flange, with a height H1 and a large end diameter of... Small end diameter The small end is machined with a groove, the groove angle is β°, and the flange dimensions are as follows: Figure 1 As shown in view B, the part is made of high-temperature alloy sheet metal with a wall thickness of 0.8 mm. Due to the part's width at the bottom and narrowness at the top, as well as the presence of flanges, unloading after die forming presents difficulties. If manual flanging using a mold is employed, the dimensional consistency of the 14 flanges cannot be guaranteed. Currently, no publicly available literature, either domestic or international, has been found regarding forming molds or methods for this type of large-size variable cross-section sheet metal cylindrical part with flanges. Summary of the Invention

[0003] The present invention aims to provide a processing device and method for large-size variable cross-section sheet metal cylinders with flanges. The forming can be completed on a single device, and the forming is reliable and effective with a short forming cycle and high efficiency. It can also effectively ensure the dimensional accuracy and consistency of the parts, and in particular, it can smoothly unload the material.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A processing device for a large-size variable cross-section sheet metal cylinder with a flange, comprising:

[0006] The lower template and the upper template are provided, wherein the lower template has a top rod hole and the upper template has a material unloading screw hole;

[0007] The top plate is a ring-shaped component, and the lower end face of the top plate is placed on the upper end face of the lower template through a lower pad;

[0008] A cone is fixedly installed on the upper end face of the lower template and located within the inner ring surface of the top plate. A guide plate is installed on the outer cone surface of the cone. The guide plate extends along the generatrix direction of the outer cone surface. An expansion block is slidably connected to the guide plate. The outer surface of the expansion block includes a first forming surface for forming the inner profile of the outer culvert channel partition.

[0009] The outer ring is an annular component and is fixedly connected to the upper end face of the top plate. The upper end of the inner ring surface of the outer ring has an annular groove, and the lower end of the inner ring surface includes a second forming surface for forming the outer cylindrical surface of the large diameter end of the outer culvert channel partition.

[0010] The first die is an annular part and is divided into at least two segments along the circumference. The inner ring surface of the first die includes a third forming surface for forming the outer conical surface near the small diameter end of the outer duct partition. The first die is placed in the annular groove of the outer ring and has a first through hole.

[0011] The second die is an annular part and is divided into at least two segments along the circumference. The inner ring surface of the second die includes a fourth forming surface for forming the outer cylindrical surface of the small diameter end of the outer duct partition plate. The axial end surface of the second die includes a fifth forming surface for forming the inner flange surface of the small diameter end of the outer duct partition plate. The second die is placed in the annular groove of the outer ring and is located above the first die. The second die has a second through hole.

[0012] The third die is an annular part. The third die is disposed between the second die and the upper template and is slidably connected to the upper template by a stripper screw. The inner ring surface of the third die includes a sixth forming surface for forming the small-diameter end flange outer shape of the outer duct partition plate. The third die has a third through hole.

[0013] The upper end of the pull rod passes through the first through hole, the second through hole and the third through hole in sequence from bottom to top and is detachably connected to the upper template. The lower end of the pull rod overlaps with the first concave mold.

[0014] An upper gasket is placed between the third die cavity and the upper template, or between the third die cavity and the expansion block.

[0015] It should be noted that the upper and lower spacers are not a complete ring, but rather consist of at least three independent block structures of equal thickness. For example, three cubic upper spacers are placed at intervals between the third die and the expansion block during the first forming process. Similarly, three cubic lower spacers can be placed at intervals between the top plate and the lower template.

[0016] As one solution:

[0017] Both the lower template and the upper template are ring-shaped components;

[0018] The cone has an axial through hole;

[0019] The guide plate is fixed to the outer conical surface of the cone by the first screw.

[0020] Furthermore, the processing device for large-size variable cross-section sheet metal cylinders with flanges also includes:

[0021] A lifting shaft, which is installed on the inner wall of the axial through hole of the cone;

[0022] The cone is mounted on the upper end face of the lower template by the second screw and the first cylindrical pin.

[0023] The first lifting bolt is installed on the outer circumferential surface of the lower template;

[0024] The second lifting bolt is installed on the outer circumferential surface of the upper template;

[0025] The second cylindrical pin is assembled at the upper end of the pull rod.

[0026] Alternatively, the top plate is connected to the outer ring via a locating pin.

[0027] As one embodiment, the pull rod is T-shaped with a rectangular cross-section. The first through hole is a T-shaped hole, and the second and third through holes are rectangular holes. The length of the first through hole is greater than the length of the second through hole. The lower end of the pull rod overlaps with the first die through a T-shaped structure.

[0028] A method for processing a large-size variable cross-section sheet metal cylinder with a flange, characterized by employing the aforementioned processing device and including the following steps:

[0029] Step 1: Raw material design and raw material size calculation. A conical shape is used as the outer shape feature of the raw material. Based on the bulging structure of the processing device, given the bulging amount and the raw material required for flanging, the outer dimensions of the conical raw material before forming are calculated.

[0030] Step 2: Blanking and preparing raw material, using sheet metal to prepare the conical raw material from Step 1;

[0031] Step 3: Cut the groove. Cut a groove at the small diameter end of the conical blank from Step 2. The groove extends along the generatrix of the outer conical surface of the conical blank.

[0032] Step 4: Shaping and flanging. The conical blank material with the grooved opening from Step 3 is placed into the processing device, formed in two stages, and then unloaded.

[0033] In the first forming process, the upper shim is placed between the expansion block and the third die. The upper die presses down on the third die. The third die pushes the expansion block down through the upper shim, while the expansion block moves outward along the radial direction of the cone. This causes the conical blank to move towards the outer ring until it fits against the outer ring, thus achieving the expansion of the conical blank and the initial bending of the small diameter end of the conical blank.

[0034] In the second forming process, the upper template is moved upward before forming, and then the upper shim is transferred between the upper template and the third die. Then the upper template moves downward and the upper shim drives the third die to move downward until the third die and the second die are closed, forming the flange size.

[0035] Unload the material, move the top plate up, push the expansion block upward while moving it radially toward the center of the cone, then move the upper template up, causing the first die, second die, third die and the formed part to detach from the expansion block together, then first disassemble the first die, then disassemble the second die and the third die, and remove the formed part.

[0036] Step 5: Machining the outer shape. Machin the outer dimensions of the duct partition, the slot at the small diameter end, and the hole at the large diameter end according to the requirements of the duct partition part drawing.

[0037] Alternatively, in step 2, the conical shape designed in step 1 is unfolded along the generatrix into two fan-shaped sections. Two fan-shaped sections are cut from the sheet metal, and then the two fan-shaped sections are spliced ​​together into a conical blank by rolling, welding, and stress relief.

[0038] Alternatively, in step 3, the position of the cutting groove corresponds to the middle position of each groove on the small diameter end of the outer duct partition part drawing, and the groove includes a rectangular part and a circular part. The circular part is located on the side away from the small diameter end of the conical blank, and the width of the rectangular part is smaller than the diameter of the circular part.

[0039] Alternatively, a laser cutting machine can be used to cut the groove in step 3.

[0040] Alternatively, in step 5, a laser cutting machine is used to process the slot at the small diameter end and the hole at the large diameter end.

[0041] The processing apparatus and method of this invention can ensure consistent flange dimensions and smooth unloading when processing culvert channel partitions. This invention has the following characteristics:

[0042] (1) The present invention adopts the idea of ​​two-stage forming. First, the flange is pre-bent and then the final forming is carried out. The two-stage forming can be achieved by simply changing the position of the upper gasket, without changing the mold.

[0043] (2) Since the flange of the outer channel partition part has a barb-like structure, it is difficult to unload after expansion. The present invention divides the die into three parts, namely the first die, the second die and the third die, which are responsible for the forming of different positions. The fast unloading is achieved by the tie rod. The first die and the second die are divided into multiple sections (which can move outward along the radial direction) to facilitate the disassembly of the die and the part. Finally, the inability to unload or the difficulty of unloading caused by the interference of the die is avoided.

[0044] (3) To ensure that the flanging is carried out smoothly, the present invention adopts the method of cutting a groove before flanging is formed, and the groove is in the form of a crack-preventing groove.

[0045] Compared with the prior art, the processing solution provided by the present invention divides the first and second dies into multiple parts (e.g., 4 sections), and uses tie rods, upper shims and lower shims in conjunction. Only one set of processing equipment is needed to form complex outer duct partition parts, which greatly shortens the part processing cycle. Moreover, the operation is simple for workers and the unloading is safe and convenient. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of the outer duct partition component;

[0047] Figure 2 This is a schematic diagram of a conical cylindrical raw material;

[0048] Figure 3 This is a schematic diagram of the cutting groove;

[0049] Figure 4 This is a schematic diagram of the outer culvert partition processing device;

[0050] Figure 5 This is a schematic diagram of the first forming process;

[0051] Figure 6 This is a schematic diagram of the second forming process;

[0052] Figure 7 This is a diagram of the unloading process;

[0053] Figure 8 This is a schematic diagram of the assembly of the tie rod with the first and second dies;

[0054] Figure 9 This is a schematic diagram of the assembly groove when the tie rod is assembled with the first and second dies.

[0055] In the diagram: 1-lower mold plate, 2-top plate, 3-cone, 4-outer ring, 5-expansion block, 6-first die cavity 1, 7-second die cavity, 8-third die cavity, 9-upper shim, 10-upper mold plate, 11-pull rod, 12-unloading screw, 13-guide plate, 14-lifting shaft, 15-lower shim, 16-first screw, 17-second screw, 18-first cylindrical pin, 19-first lifting bolt, 20-second lifting bolt, 21-second cylindrical pin. Detailed Implementation

[0056] The present invention will be further described below with reference to specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0057] like Figure 1As shown in partial view B, the variable cross-section structure of the culvert duct diaphragm consists of four parts, arranged from left to right. The first part corresponds to the large-diameter end of the culvert duct diaphragm. It starts with a cylindrical surface with an axial height of H2, followed by a frustum (or conical surface) with an axial height of (H3-H2), and then a small-diameter end corresponding to the outer bypass channel partition. The cylindrical surface has an axial height of H5, and the final part is a flange with an axial height of H4 and a radial length of D2.

[0058] Regarding the processing and forming of the aforementioned outer culvert channel partition, the present invention achieves this from the following aspects:

[0059] (1) Fabrication of forming device: Based on the external dimensions of the part, a forming and flanging processing device is designed and manufactured. The forming die is divided into three parts (i.e., the first die 6, the second die 7, and the third die 8). The number of dies involved in forming is changed by using the upper shim 9 and the tie rod 11. The first die 6 and the second die 7 are cut into four sections along the circumferential direction to facilitate subsequent unloading and prevent the formed part from getting stuck (the reason for the segmentation is to allow the die to exit the part, which requires the die to exit the hook structure at the flanging of the part. The more segments, the smaller the distance required to exit radially. If only two segments are used, the die needs to exit a long distance to exit the segmented surface because the part is annular, resulting in too long a stroke. Therefore, this invention uses four segments). Finally, a qualified part with a stable profile is formed on a single processing device, which greatly shortens the part processing cycle and makes the operation simple and the material handling safe and convenient for workers.

[0060] (2) Calculate the size of the blank: Based on the structural characteristics of the processing device, given the bulging amount and the blank required for flanging, calculate the size of the conical blank before forming.

[0061] (3) Prepare and shape the raw material: Based on the calculation results, prepare the conical raw material.

[0062] (4) Cutting groove: Cut a groove at the small diameter end of the conical blank to prepare for subsequent flanging.

[0063] (5) Forming and flanging: The conical blank is formed and flanged using a processing device.

[0064] (6) External machining: Machining the external shape and holes according to the final dimensions of the part.

[0065] Specifically, the processing method of the present invention includes the following steps:

[0066] Step 1, Fabrication of processing equipment: Based on the structure of the part, manufacture as follows... Figure 4The processing device shown includes a lower template 1 with a push rod hole, a top plate 2, a cone 3, an outer ring 4, an expansion block 5, a first die 6 (four arcs of equal length), a second die 7 (four arcs of equal length), a third die 8 (a complete ring), an upper gasket 9, an upper template 10 with a stripper screw hole, a pull rod 11, a stripper screw 12, a guide plate 13 extending along the generatrix of the cone 3, a lifting shaft 14, a lower gasket 15, a first screw 16, a second screw 17, a first cylindrical pin 18, a first lifting bolt 19, a second lifting bolt 20, and a second cylindrical pin 21.

[0067] Step 2, Calculate the blank size: Based on the structural characteristics of the processing device designed in Step 1, given the bulging amount and the blank required for flanging, calculate the size of the conical blank before forming, such as... Figure 2 As shown, the diameter of the small end is The diameter of the large end is The height is H (note that here...) and The 1 and 2 in the figure do not represent a specific diameter, but rather two different diameters.

[0068] Step 3, Prepare and shape the blank: Based on the calculation results, prepare a conical blank. The blank is conical in shape and has two weld seams. A conical blank can be modeled in UG and unfolded using the sheet metal module to obtain the blanking dimensions of the fan-shaped sheet. After rolling, welding, and heat treatment to relieve stress, the conical blank can be used for subsequent shaping.

[0069] Step 4, Cut the groove: Cut a groove at the smaller diameter end of the conical blank to prepare for subsequent flanging. Use a laser cutting machine to cut the groove on the conical blank corresponding to the part ( Figure 1 The middle of the 14 notches in the partition of the culvert (between the inner and outer passageways) is cut with a groove, such as... Figure 3 The groove width is A, the groove depth is B, and the diameter of the circle at the groove root is... After cutting, the groove is ground and polished. Grooving makes flanging smoother, and the shape of the groove prevents the part from cracking along the groove during subsequent forming. (Note that the groove depth B should be within an appropriate range; if it is too deep, the part will be scrapped due to insufficient material, and if it is too shallow, the part will tear during flanging.) It should be larger than the width of A.

[0070] Step 5, shaping and flanging: using Figure 4 The processing equipment shapes and flangs the conical blank.

[0071] First, install the processing device onto the hydraulic press, separate the upper template 10 and the lower template 1, and place the conical blank into the processing device.

[0072] During the first forming, the upper shim 9 is placed between the expansion block 5 and the third die 8 (the third die 8 and the upper template 10 are slidably connected by the stripper screw 12, that is, the threaded section of the stripper screw 12 is screwed into the third die 8, and the head of the stripper screw 12 is slidably connected in the stepped through hole of the upper template 10). At this time, the hydraulic press is turned on, the upper template 10 presses down on the third die 8, and then the third die 8 pushes the expansion block 5 down and moves it outward at the same time (the expansion block 5 moves along the generatrix of the cone 3 through the guide plate 13). Moving from top to bottom, thus expanding outwards, until the conical blank is fitted with the inner ring surface of the outer ring 4, achieving the bulging of the conical blank and the initial bending of the small diameter end (the lower end of the inner ring surface of the outer ring 4 includes a second forming surface for forming the outer cylindrical surface of the large diameter end of the outer duct partition, which cooperates with the first forming surface on the outer surface of the bulging block 5 for forming the inner profile of the outer duct partition to form a cylindrical surface with an axial height of H2 and a frustum surface with an axial height of H3-H2). At this time, the state of the processing device is as follows. Figure 5 As shown. It should be noted that the function of the lower shim 15 includes adjusting the diameter and limiting the conical blank after expansion. By placing lower shims 15 of different thicknesses (axial), the limit position of the expansion block 5 can be controlled, thereby controlling the final expansion diameter and rebound amount of the conical blank, and preventing the outer ring 4 from being cracked.

[0073] Before the second forming, the upper mold plate 10 moves upward. As the head of the unloading screw 12 slides in the stepped through hole of the upper mold plate 10, the third die 8 is pulled apart from the upper mold plate 10 by its own weight. The operator takes out the upper shim 9 from the first forming and transfers it to the gap between the upper mold plate 10 and the third die 8. At this time, since the pull rod 11 is long enough (the length design of the pull rod 11 must meet the requirement of having enough space to install the upper shim 9 during the first and second forming), the lower end of the pull rod 11 has not yet moved at the joint with the first die 6. At this time, the first die 6 and the second die 7 have not moved and are still in the annular groove of the outer ring 4.

[0074] During the second forming process, the upper mold plate 10 moves downward, causing the third die 8 to move downward. The third die 8 and the second die 7 close together (the third forming surface used to form the outer conical surface near the small diameter end of the outer duct partition, the fourth forming surface used to form the outer cylindrical surface of the small diameter end of the outer duct partition, the fifth forming surface used to form the inner flange surface of the small diameter end of the outer duct partition, and the sixth forming surface used to form the outer flange surface of the small diameter end of the outer duct partition all cooperate together), forming the flange size (corresponding to the small diameter end of the outer duct partition). And the cylindrical surface with an axial height of H5, and the flange with an axial height of H4 and a radial length of D2), the state of the machining device at this time is as follows Figure 6 As shown.

[0075] During unloading, if Figure 7Using a hydraulic press ejector rod, the ejector pin passes through the ejector pin hole on the lower template 1 to lift the top plate 2 upwards. This causes the expansion block 5 to move upwards and towards the center of the cone 3, so that it no longer obstructs the individual movement of the first die 6 and the second die 7. At this time, the upper template 10 moves upwards, causing the first die 6, the second die 7, the third die 8, and the part to be dislodged from the outer ring 4 and the expansion block 5. Since the first die 6 and the second die 7 are segmented parts (divided into 4 segments along the circumference), each segment can move independently. At this time, simply moving one segment individually is enough to remove the formed part. For operation, please refer to... Figure 8 and Figure 9 , Figure 8 The diagram shows one of the four segments of the first die 6 and the second die 7. The length of the first through hole on the first die 6 is greater than the length of the second through hole on the second die 7. First, the first die 6 is pulled outward along the length of the first through hole, causing the third forming surface of the outer conical surface near the small diameter end of the outer channel partition on the first die 6 to detach from the part. Then, the part is lifted a short distance to detach from the fourth and fifth forming surfaces on the second die 7. Finally, the second die 7 is pulled outward along the length of the second through hole, thus completing the separation of the part from the die. It is important to note that the first die 6 must be withdrawn before the second die 7 can be removed, because their forming surfaces interfere with each other. Figure 9 As can be seen, the tie rod 11 is T-shaped overall, with a rectangular cross-section that serves a guiding function (the first die 6, the second die 7, and the third die 8 are connected together by the tie rod 11). The lower end of the tie rod 11 overlaps with the first through hole of the first die 6, which has a T-shaped cross-section, through a T-shaped structure. The upper end of the tie rod 11 passes through the upper template 10 and then... Figure 4 The second cylindrical pin 21 is connected to the mounting base of the upper template 10. Figure 4 (The mounting base is not shown in the figure). Each section of the first die 6 and the second die 7 is equipped with two tie rods 11. The first through hole and the second through hole on the first die 6 and the second die 7 are parallel and both extend radially.

[0076] Step 6, External Shape Machining: Machin the external shape and holes according to the final dimensions of the duct partition. Use a five-axis laser cutting machine to cut the external duct partition according to the drawings (…). Figure 1 The requirement is to cut the small-diameter end slot of the outer culvert channel partition. Figure 1 14 grooves with a center angle of β° and large-diameter end holes ( Figure 1 The small-diameter holes and large-diameter holes within the corresponding size H2 range are machined in place.

[0077] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A processing device for a large-size variable cross-section sheet metal cylinder with a flange, characterized in that, include: The lower template (1) and the upper template (10) are provided. The lower template (1) has a top rod hole and the upper template (10) has a material unloading screw hole. Top plate (2), the top plate (2) is an annular piece, and the lower end face of the top plate (2) is placed on the upper end face of the lower template (1) through the lower pad (15); A cone (3) is fixedly installed on the upper end face of the lower template (1) and located in the inner ring surface of the top plate (2). A guide plate (13) is installed on the outer cone surface of the cone (3). The guide plate (13) extends along the generatrix of the outer cone surface. An expansion block (5) is slidably connected on the guide plate (13). The outer surface of the expansion block (5) includes a first forming surface for forming the inner profile of the outer culvert partition. Outer ring (4), the outer ring (4) is an annular part and is fixedly connected to the upper end face of the top plate (2). The upper end of the inner ring surface of the outer ring (4) has an annular groove, and the lower end of the inner ring surface includes a second forming surface for forming the outer cylindrical surface of the large diameter end of the outer culvert channel partition. The first die (6) is an annular part and is divided into at least two segments along the circumference. The inner ring surface of the first die (6) includes a third forming surface for forming the outer conical surface near the small diameter end of the outer duct partition. The first die (6) is placed in the annular groove of the outer ring (4). The first die (6) has a first through hole. The second die (7) is an annular part and is divided into at least two segments along the circumference. The inner annular surface of the second die (7) includes a fourth forming surface for forming the outer cylindrical surface of the small diameter end of the duct partition plate. The axial end surface of the second die (7) includes a fifth forming surface for forming the inner flange of the small diameter end of the duct partition plate. The second die (7) is placed in the annular groove of the outer ring (4) and is located above the first die (6). The second die (7) has a second through hole. The third die (8) is an annular part. The third die (8) is located between the second die (7) and the upper template (10) and is slidably connected to the upper template (10) by the unloading screw (12). The inner ring surface of the third die (8) includes a sixth forming surface for forming the outer shape of the small diameter end flange on the outer duct partition. The third die (8) has a third through hole. The upper end of the pull rod (11) passes through the first through hole, the second through hole and the third through hole in sequence from bottom to top and is detachably connected to the upper template (10). The lower end of the pull rod (11) overlaps with the first die (6). Upper gasket (9), which is placed between the third die (8) and the upper template (10), or between the third die (8) and the expansion block (5); The pull rod (11) is T-shaped with a rectangular cross-section. The first through hole is a T-shaped hole, and the second and third through holes are rectangular holes. The length of the first through hole is greater than the length of the second through hole. The lower end of the pull rod (11) overlaps with the first die (6) through the T-shaped structure.

2. The processing device for a large-size variable cross-section sheet metal cylinder with flange as described in claim 1, characterized in that: Both the lower template (1) and the upper template (10) are ring-shaped components; The cone (3) has an axial through hole; The guide plate (13) is fixed to the outer cone surface of the cone (3) by the first screw (16).

3. The processing device for a large-size variable cross-section sheet metal cylinder with flanges according to claim 2, characterized in that, Also includes: The lifting shaft (14) is installed on the inner wall of the axial through hole of the cone (3); The cone (3) is mounted on the upper end face of the lower template (1) by the second screw (17) and the first cylindrical pin (18); The first lifting bolt (19) is installed on the circumferential outer surface of the lower template (1); The second lifting bolt (20) is installed on the circumferential outer surface of the upper template (10); The second cylindrical pin (21) is mounted on the upper end of the pull rod (11).

4. The processing device for a large-size variable cross-section sheet metal cylinder with flanges according to claim 1, characterized in that: The top plate (2) is connected to the outer ring (4) by a positioning pin.

5. A method for processing a large-size variable cross-section sheet metal cylinder with a flange, characterized in that, The processing apparatus according to claim 1 is used, and includes the following steps: Step 1: Raw material design and raw material size calculation. A conical shape is used as the outer shape feature of the raw material. Based on the bulging structure of the processing device, given the bulging amount and the raw material required for flanging, the outer dimensions of the conical raw material before forming are calculated. Step 2: Blanking and preparing raw material, using sheet metal to prepare the conical raw material from Step 1; Step 3: Cut the groove. Cut a groove at the small diameter end of the conical blank from Step 2. The groove extends along the generatrix of the outer conical surface of the conical blank. Step 4: Shaping and flanging. The conical blank material with the grooved opening from Step 3 is placed into the processing device, formed in two stages, and then unloaded. In the first forming, the upper shim (9) is placed between the expansion block (5) and the third die (8). The upper template (10) presses down on the third die (8). The third die (8) pushes the expansion block (5) down through the upper shim (9). At the same time, the expansion block (5) moves radially outward along the cone (3), thereby driving the conical blank to move towards the outer ring (4) until it fits against the outer ring (4), thus realizing the expansion of the conical blank and the initial bending of the small diameter end of the conical blank. For the second forming, before forming, the upper template (10) is moved upward, and then the upper shim (9) is transferred between the upper template (10) and the third cavity (8). Then the upper template (10) moves downward and the upper shim (9) drives the third cavity (8) to move downward until the third cavity (8) and the second cavity (7) are closed to form the flange size. Unload the material, move the top plate (2) up, push the expansion block (5) upward while moving it radially towards the center of the cone (3) along the cone (3), then move the upper template (10) up, and drive the first die (6), the second die (7), the third die (8) and the formed part to detach from the expansion block (5) together. Then, first disassemble the first die (6), then disassemble the second die (7) and the third die (8) to remove the formed part. Step 5: Machining the outer shape. Machin the outer dimensions of the duct partition, the slot at the small diameter end, and the hole at the large diameter end according to the requirements of the duct partition part drawing.

6. The processing method for a large-size variable cross-section sheet metal cylinder with flanges according to claim 5, characterized in that: In step 2, the conical shape designed in step 1 is unfolded along the generatrix into two fan-shaped sections. Two fan-shaped sections are cut from the plate, and then the two fan-shaped sections are spliced ​​together into a conical rough material by rolling, welding, and stress relief.

7. The processing method for a large-size variable cross-section sheet metal cylinder with flanges according to claim 5, characterized in that: In step 3, the position of the cutting groove corresponds to the middle position of each groove on the small diameter end of the outer duct partition part drawing, and the groove includes a rectangular part and a circular part. The circular part is located on the side away from the small diameter end of the conical blank, and the width of the rectangular part is smaller than the diameter of the circular part.

8. The processing method for a large-size variable cross-section sheet metal cylinder with flanges according to claim 5, characterized in that: In step 3, a laser cutting machine is used to cut the groove.

9. A method for processing a large-size variable cross-section sheet metal cylinder with flanges according to claim 5, characterized in that: In step 5, a laser cutting machine is used to process the slot at the small diameter end and the hole at the large diameter end.

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