A method for forming a two-way bending special-shaped reducing pipe for an aero-engine, a forming die and a device

Abstract

The application discloses a forming method, a forming die and a device for a bidirectional bending special-shaped reducing pipe for an aero-engine. The forming method adopts a split combined die, utilizes combined male dies and combined female dies to complete vertical pre-bending, and utilizes side pushing female dies and combined female dies to complete horizontal pre-bending, so that the pre-forming of the bidirectional bending special-shaped reducing pipe is completed in the same set of die. The forming method is combined with a wedge transmission component and a two-section inclined surface of a sealing push head, realizes two actions of pipe blank sealing and material supplementing, according to the change of the inclined surface angle, the wedge transmission component can accurately supplement material and form when the pipe is internally high-pressured, and effectively eliminates the possible fluctuation during hydraulic loading matching, improves the profile machining precision of the bidirectional bending special-shaped reducing pipe during internal high-pressure forming, and effectively improves the part quality and the machining qualification rate.

Description

Technical Field

[0001] This invention relates to the field of bidirectional bending shaped tube forming technology, and more specifically, to a method, forming mold, and apparatus for forming bidirectional bending shaped variable diameter tubes for aero-engines. Background Technology

[0002] Lightweighting of pipelines in aero-engines is a key technology for improving engine performance, reducing fuel consumption, and lowering emissions. To achieve this goal, thin-walled and curved designs are typically employed to reduce pipeline weight, optimize pipeline curve shapes, and minimize straight sections, thereby reducing unnecessary weight. Based on these requirements, the pipelines in aero-engines are often thin-walled, irregularly shaped, curved, and variable-diameter pipes. Due to the complex structure and shape of these irregularly shaped pipes, multiple sets of molds are often required for assembly and matching, resulting in complex processes and low production efficiency and high costs. Therefore, it is necessary to streamline the production process and molds for irregularly shaped pipes to reduce costs and improve production efficiency.

[0003] CN202591342U discloses a pipe bending and forming device that employs multiple irregular bending and bulging dies that cooperate with pipe fittings. These include an upper die block and a lower die block that cooperate with the pipe fittings. An upper die holder and a lower die holder are set on the worktable to mount the upper and lower die blocks. A hydraulic cylinder is connected to the hydraulic bulging die via a punch mechanism. This patent obtains high-pressure liquid by squeezing the liquid in the hydraulic cylinder through the movement of the piston. The high-pressure liquid is injected into the pipe blank through the punch, giving the pipe blank the hydraulic pressure required for bulging. The pipe bending and forming device provided by this patent achieves a design that allows for both irregular bending of pipe fittings and internal high-pressure forming on a single set of internal high-pressure forming dies. Simultaneously, by controlling the piston stroke to control the axial force and adjusting the overflow value of the overflow valve to control the forming fluid pressure of the tube blank, the forming pressure of the forming equipment is gradually increased. This allows the transition radius of the tube blank to gradually come into contact with the hydraulic bulging die, avoiding the defects of instability and wrinkling at the tube blank end due to excessive friction when axial feeding and internal pressure forming are performed simultaneously, and the defects of cracking in the bulging zone due to insufficient feeding. This can greatly improve the forming limit of the tube and reduce costs. Although this patent can reduce the number of molds and processes for shaped tubes, there are still the following aspects that need improvement: (1) This patent is only applicable to the forming of unidirectional irregular tubes. When the irregular tube needs to be bidirectional, multiple sets of molds and processes are still required to process in different directions. Once multiple processes are carried out, problems such as springback of the pre-bent surface causing poor dimensional accuracy or failure of the internal high-pressure liquid seal are likely to occur. (2) When using a double-action liquid filling molding machine for bulging, the stroke of the main cylinder and the stroke of the side push cylinder may fluctuate due to the difference in synchronization when matching with the hydraulic loading during the internal high-pressure forming, resulting in uneven wall thickness and wrinkling of the irregular pipe fittings.

[0004] (3) The pressure of the forming fluid of the tube blank is controlled by the piston control of the side-push hydraulic cylinder and the overflow value of the overflow valve. The force is relatively small in the early stage of the expansion stage and is easy to control. The force required in the later stage is larger, which makes it difficult to control and unstable. It is easy to cause problems such as wrinkling or even cracking of the tube surface due to material replenishment deviation or untimely replenishment.

[0005] In the aforementioned problem, the CN104226776B metal thin-walled tube impact hydraulic bulging system discloses the use of two inclined sliders fixed to the upper worktable, which move together with the worktable and compress the horizontal guide column to move horizontally, thereby achieving the sealing of the metal thin-walled tube. As the upper worktable continues to descend, the upper and lower molds close, and the metal thin-walled tube achieves impact hydraulic bulging under the action of internal liquid and external impact force. This patent utilizes the stroke of the main cylinder of the upper worktable to simultaneously control the longitudinal and lateral thrust pressure of the mold, avoiding the fluctuations that may occur when the stroke of the lateral thrust hydraulic cylinder matches the stroke of the main cylinder during internal high-pressure forming. At the same time, the horizontal movement of the two horizontal guide columns is used to achieve sealing and axial feeding of the metal thin-walled tube during the bulging process. However, in the forming of irregular tubes, different hydraulic pressures are required at different stages to complete the deformation of the tube blank, thereby precisely controlling the feeding and forming of the irregular tube. Obviously, the single inclined surface of the inclined slider and the horizontal guide column in this patent cannot match the loading hydraulic curve of the irregular tube to achieve precise feeding and hydraulic control. Summary of the Invention

[0006] The main technical problem to be solved by the present invention is that the existing technology has shortcomings such as complex molds and processes, easy sealing failure, and low precision of material replenishment and hydraulic control in the forming process of bidirectional bending irregular diameter tubes. The present invention provides a forming mold and device for bidirectional bending irregular diameter tubes for aero-engines.

[0007] Another technical problem solved by the present invention is to provide a method for forming bidirectional curved variable diameter tubes for aero engines.

[0008] The objective of this invention is achieved through the following technical solution: A forming mold for a bidirectional bending variable diameter tube for an aero-engine includes an upper template, a lower template, a combined mold, a pressure block, a sealing pusher, and a wedge transmission component. The combined mold includes combined female mold one, combined female mold two, side-push female mold one, side-push female mold two, and combined punch. Combined female mold one and combined female mold two are fixed at intervals on the lower template. Side-push female mold one and side-push female mold two are slidably connected to the lower template, and side-push female mold one and side-push female mold two can be closed with combined female mold one and combined female mold two. The combined punch can be closed with combined female mold one, combined female mold two, side-push female mold one and side-push female mold two to form the profile of a bidirectional curved variable diameter pipe. The upper template is provided with a pressure block for fixing the tube blanks at both ends of the female mold. The two ends of the tube blank in the combined mold are provided with sealing push heads. The lower template is provided with a sliding slider. One end of the slider is connected to the sealing push head, and the other end is provided with an upper inclined surface 1 and a lower inclined surface 1 with different inclination angles. The upper template is also provided with a wedge transmission component. The wedge transmission component includes a lower inclined surface 2 that cooperates with the upper inclined surface 1 of the slider, and an upper inclined surface 2 that cooperates with the lower inclined surface 1 of the slider. The sealing pusher includes an inlet section, a flexible sealing section, a support section, a rigid sealing section, and a feeding section connected in sequence. The lengths of the flexible sealing section, the support section, and the rigid sealing section are the same as the feed strokes of the upper inclined surface one of the slider and the lower inclined surface two of the wedge transmission component. The length of the feeding section is the same as the feed strokes of the lower inclined surface one of the slider and the upper inclined surface two of the wedge transmission component. The sealing pusher is also provided with a filling port for filling liquid into the tube blank.

[0009] Furthermore, the lower template is provided with a slide rail, and the first and second side-pushing female molds are connected to the lower template through the slide rail.

[0010] Furthermore, the pressure block is connected to the upper template via a spring.

[0011] Furthermore, the slider is provided with a liquid filling channel, which is connected to the liquid filling port of the sealing pusher.

[0012] Furthermore, the flexible sealing section has a groove on its outer periphery, and a rubber sealing ring is provided in the groove.

[0013] Furthermore, the upper inclined surface of the slider has an inclination angle of 45°, and the lower inclined surface of the slider has an inclination angle of 50~60°; the upper inclined surface of the wedge transmission component has an inclination angle of 50~60°, and the lower inclined surface of the wedge transmission component has an inclination angle of 45°.

[0014] Furthermore, wear-resistant blocks are provided on the upper inclined surface 2 and the lower inclined surface 2 of the wedge transmission component.

[0015] Furthermore, the lower template slider is provided with stops on both sides. During the expansion process, the stops play a supporting role to prevent excessive hydraulic back expansion force from causing seal failure.

[0016] A bidirectional bending variable diameter tube forming device for aero-engines includes the aforementioned bidirectional bending variable diameter tube forming mold and a double-action liquid filling stretching forming device. The inner slider and combined punch of the double-action liquid filling stretching forming device are connected, the outer slider of the double-action liquid filling stretching forming device is connected to the upper template, and the liquid filling device of the double-action liquid filling stretching forming device is connected to the liquid filling port of the sealing pusher.

[0017] A method for forming a bidirectional bending irregular diameter tube for an aero-engine, comprising the following steps: S1. Place the tube blank on the combined female mold one and combined female mold two, insert the inlet section of the sealing push head into both ends, and install the slider on the end side of the sealing push head; S2. Drive the upper template to move down, press the material block to press the two ends of the tube blank, control the upper template to continue to move down, the lower inclined surface of the inclined wedge transmission component 2 contacts and cooperates with the upper inclined surface of the slider 1, under the action of the downward force of the inclined wedge transmission component, push the slider to move horizontally, the flexible sealing section of the sealing push head performs the first stage of sealing, and the sealing push head continues to advance the support section and rigid sealing section into the tube blank to achieve the second stage of sealing; S3. After filling the tube blank with liquid and applying a certain amount of hydraulic pressure, drive the combined punch to move down until it closes with the combined female die one and combined female die two to complete the vertical pre-bending of the tube blank. Then push the side-pushing female die one and side-pushing female die two to close with the combined female die one and combined female die two to complete the horizontal pre-bending of the tube blank. S4. Control the upper template to move downward, causing the upper inclined surface two of the wedge transmission component to cooperate with the lower inclined surface one of the slider. The slider continues to push the feeding section of the sealing pusher to the tube blank. At the same time, according to the loading hydraulic curve, a higher liquid chamber pressure is loaded to match the advancement of the sealing pusher, so as to realize the expansion of the irregular surface inside the tube.

[0018] Furthermore, the rigid sealing section is inclined and can cooperate with the pressure block to rigidly extrude and seal the tube blank, with the extrusion amount being to extrude the material from 1 times the wall thickness to 0.6 to 0.7 times the wall thickness.

[0019] Compared with existing technologies, the beneficial effects are: This invention employs a split-type combined mold, including a combined female mold, a side-push female mold, and a combined punch. The combined punch and combined female mold are used to complete the pre-bending in the vertical direction, and the side-push female mold and combined female mold are used to complete the pre-bending in the horizontal direction. This achieves the pre-forming of bidirectional bending irregular diameter pipes in the same set of molds. Meanwhile, this invention utilizes the combination of a wedge drive component and a two-section inclined surface of a sealing pusher. This ensures the sealing effect of the high pressure inside the tube blank, effectively solving the problems of positioning the tube blank in the high-pressure forming mold and the easy failure of the tube end seal. This improves the sealing performance of the formed parts, increases the pass rate of the parts, and reduces the processing cycle and cost. Furthermore, it precisely replenishes material during the high-pressure forming of the tube, in coordination with the hydraulic curve of the loading, avoiding tube wall wrinkling caused by premature replenishment or tube wall rupture caused by untimely replenishment. This improves the forming quality of bidirectional bending shaped variable diameter tubes. At the same time, it effectively eliminates the fluctuations that may occur in the stroke of the side push cylinder and the stroke of the main cylinder in traditional internal high-pressure equipment when matching the hydraulic loading during internal high-pressure forming. This improves the surface processing accuracy of bidirectional bending shaped variable diameter tubes during internal high-pressure forming, effectively improving the quality of the parts and the pass rate of the processing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a bidirectional curved variable diameter pipe; a is the model structure diagram, b is the front view, and c is the top view; Figure 2 It is a high-pressure forming mold for bidirectional bending irregular diameter pipes; Figure 3 This is an exploded view of a modular molding component model; Figure 4 This is a schematic diagram of a sealing pusher; Figure 5 This is a schematic diagram of the wedge drive components and the slider; Figure 6 This is a diagram of the wedge drive components.

[0021] Among them, 1 is the upper template, 2 is the pressure block, 3 is the lower template, 4 is the combined punch, 5 is the combined female mold one, 6 is the side-push female mold one, 7 is the combined female mold two, 8 is the sealing push head, 801 is the inlet section, 802 is the flexible sealing section, 803 is the support section, 804 is the rigid sealing section, 805 is the material replenishment section, 9 is the slider, 901 is the upper inclined surface one, 902 is the lower inclined surface one, 10 is the inclined wedge transmission component, 1001 is the upper inclined surface two, 1002 is the lower inclined surface two, 11 is the stop block, and 12 is the wear-resistant block. Detailed Implementation

[0022] The following examples further explain and clarify the invention, but the specific examples do not limit the invention in any way.

[0023] Example 1 This embodiment provides a forming mold for a bidirectional bending irregular diameter tube for aero-engines, such as... Figures 2-3 It includes an upper template 1, a lower template 3, a combination mold, a pressure block 2, a sealing pusher 8, and a wedge transmission component 10.

[0024] The combined mold includes combined female mold 5, combined female mold 2 7, side-push female mold 1 6, side-push female mold 2 6, and combined male mold 4. The upper surfaces of combined female mold 1 5 and combined female mold 2 7 have the profiles of both ends of the variable diameter tube, and these two are fixed to the lower template 3 at intervals. Side-push female mold 1 6 and side-push female mold 2 6 are slidably connected to the lower template 3, and can be closed with combined female mold 1 5 and combined female mold 2 7 to form the lower profile female mold of the bidirectional curved variable diameter tube. The lower surface of the combined male mold 4 is provided with the upper profile male mold of the variable diameter tube, and can be closed with combined female mold 1, combined female mold 2, side-push female mold 1, and side-push female mold 2.

[0025] The upper template 1 is provided with pressure blocks 2 for fixing the tube blanks at both ends of the female mold, and the two ends of the tube blank inside the female mold are provided with sealing pushers 8, such as Figures 5-6 The lower template 3 is provided with a sliding slider 9. One end of the slider 9 is connected to the sealing push head 8, and the other end is provided with an upper inclined surface 901 and a lower inclined surface 902 with different inclination angles. The upper template 1 is also provided with a wedge transmission component 10. The wedge transmission component 10 includes a lower inclined surface 1002 that cooperates with the upper inclined surface 901 of the slider 9, and an upper inclined surface 1001 that cooperates with the lower inclined surface 902 of the slider 9. The sealing pusher 8 is equipped with a filling port that communicates with the inside of the tube blank. Liquid is injected into the tube blank through the filling port to achieve internal high-pressure expansion. For example... Figure 4 The sealing pusher 8 includes an inlet section 801, a flexible sealing section 802, a support section 803, a rigid sealing section 804, and a material replenishing section 805 connected in sequence. The inlet section 801 guides the tube blank, allowing it to be smoothly introduced into the sealing pusher 8. The flexible sealing section 802 provides a flexible seal. The support section 803 supports the roundness of the tube blank and prepares for subsequent rigid sealing. The rigid sealing section 804 cooperates with the pressure block 2 to rigidly extrude and seal the tube. The material replenishing section 805, when the sealing pusher 8 moves laterally, pushes the tube blank to move, replenishing material into the cavity during the internal high-pressure forming process, reducing material thinning during bulging and improving formability. The lengths of the flexible sealing section 802, the support section 803, and the rigid sealing section 804 are the same as the feed strokes of the upper inclined surface 901 of the slider 9 and the lower inclined surface 1002 of the wedge transmission component 10. The length of the feeding section 805 is the same as the feed strokes of the lower inclined surface 902 of the slider 9 and the upper inclined surface 1001 of the wedge transmission component 10.

[0026] Example 2 This embodiment provides a forming mold for a bidirectional bending irregular diameter tube for aero-engines, such as... Figures 2-3 It includes an upper template 1, a lower template 3, a combination mold, a pressure block 2, a sealing pusher 8, and a wedge transmission component 10.

[0027] The combined mold includes combined female mold 5, combined female mold 2 7, side-push female mold 1 6, side-push female mold 2 6, and combined male mold 4. The upper surfaces of combined female mold 1 5 and combined female mold 2 7 have the profiles of both ends of the variable diameter tube, and are fixedly mounted on the lower template 3 at intervals. The lower template 3 is equipped with slide rails, through which side-push female molds 1 6 and 2 7 are connected to the lower template 3. Side-push female molds 1 6 and 2 7 can be closed with combined female mold 1 5 and combined female mold 2 7 to form the lower profile female mold of the bidirectional curved variable diameter tube. The lower surface of the combined male mold 4 has the upper profile male mold of the variable diameter tube. The combined male mold 4 can be closed with combined female mold 1 5, combined female mold 2 7, side-push female mold 1 6, and side-push female mold 2 6 to jointly form the profile of the bidirectional curved variable diameter tube.

[0028] The upper template 1 is equipped with pressure blocks 2 for fixing the blanks at both ends of the female mold, and the pressure blocks 2 are connected to the upper template 1 via nitrogen springs. Figures 5-6 The two ends of the tube blank in the combined mold are equipped with sealing pushers 8. The slider 9 is connected to the lower template 3 via a linear slide rail. One end of the slider 9 is connected to the sealing pusher 8, and the other end is equipped with an upper inclined surface 901 with an inclination angle of 45° and a lower inclined surface 902 with an inclination angle of 60°. The upper template 1 is also equipped with a wedge transmission component 10. The wedge transmission component 10 includes a lower inclined surface 1002 that fits against the upper inclined surface 901 of the slider 9, and an upper inclined surface 1001 that fits against the lower inclined surface 902 of the slider 9. Wear-resistant blocks 12 are provided on the upper inclined surface 1001 and the lower inclined surface 1002 of the wedge transmission component 10. The angles of the lower inclined surface 902 of the slider 9 and the upper inclined surface 1001 of the wedge transmission component 10 can be selected to match the appropriate angle according to the adjustment of the loading hydraulic curve of the shaped tube, preferably in the range of 50~60°, so as to achieve dual precise control of loading hydraulic pressure and material replenishment, and ensure the quality of bulging. The slider 9 of the lower template 3 is also provided with stops 11 on both sides, which can play a supporting role and prevent excessive hydraulic back expansion force from causing sealing failure.

[0029] The sealing pusher 8 has a filling port that communicates with the inside of the tube blank. The slider 9 has a filling channel that connects to the filling port of the sealing pusher 8. Liquid can be filled into the tube blank through the filling channel from the filling port to achieve internal high-pressure expansion. Figure 4The sealing pusher 8 includes an inlet section 801, a flexible sealing section 802, a support section 803, a rigid sealing section 804, and a feeding section 805. The lengths of the flexible sealing section 802, support section 803, and rigid sealing section 804 are the same as the feed stroke of the upper inclined surface 901 of the slider 9 and the lower inclined surface 1002 of the wedge transmission component 10. The length of the feeding section 805 is the same as the feed stroke of the lower inclined surface 902 of the slider 9 and the upper inclined surface 1001 of the wedge transmission component 10. The inlet section 801 guides the tube blank, allowing it to be smoothly introduced into the sealing pusher 8. A sealing rubber ring is placed in the groove of the flexible sealing section 802 for flexible sealing. The support section 803 supports the roundness of the tube blank and prepares for subsequent rigid sealing. The rigid sealing section 804 is an inclined surface that cooperates with the pressure block 2 to rigidly extrude and seal the pipe, reducing the material thickness from 1 times to 0.6-0.7 times the original thickness. The material replenishing section 805, when the sealing pusher 8 moves laterally, pushes the billet to move, replenishing material into the cavity during the internal high-pressure forming process, reducing material thinning during bulging and improving formability.

[0030] Example 3 A forming device for a bidirectional curved variable diameter tube for an aero-engine, comprising the forming mold and a double-action liquid-filling stretching forming device described in Embodiment 1 or Embodiment 2, wherein the inner slider connected to the stretching cylinder of the double-action liquid-filling stretching forming device is connected to the combined punch, the outer slider connected to the pressing cylinder of the double-action liquid-filling stretching forming device is connected to the upper template, the liquid filling device of the double-action liquid-filling stretching forming device is connected to the liquid filling port of the sealing push head, and the inner slider of the liquid filling device is connected to the combined punch. With the lifting and lowering control of the liquid filling device, the combined punch 4 can be driven to close with the combined female mold 1 5, combined female mold 2 7, side-pushing female mold 1 6, and side-pushing female mold 2, jointly forming the profile of the bidirectional curved variable diameter tube. The outer slider of the liquid filling device is connected to the upper template 1, and the liquid filling device of the liquid filling device is connected to the liquid filling port of the sealing push head 8.

[0031] Example 4 This embodiment provides a method for forming a bidirectional bending irregular diameter tube for aero-engines, the steps of which include: S1. Place the tube blank on the combined female mold 1 5 and combined female mold 2 7, insert the inlet section 801 of the sealing push head 8 into both ends, and install the slider 9 on the end side of the sealing push head 8 to connect the liquid filling device of the double-action liquid filling stretching forming equipment. S2. The outer slider of the double-action liquid-filled stretching forming equipment drives the upper template 1 to move down, the pressure block 2 presses down on both ends of the tube blank, and controls the upper template 1 to continue to move down. The lower inclined surface 1002 of the inclined wedge transmission component 10 contacts and cooperates with the upper inclined surface 901 of the slider 9. Under the downward force of the inclined wedge transmission component 10, the slider 9 is pushed to move horizontally. The flexible sealing section 802 of the sealing push head 8 performs the first stage of sealing. The sealing push head 8 continues to advance the support section 803 and the rigid sealing section 804 into the tube blank to achieve the second stage of sealing. S3. After the filling device fills the tube blank with a certain amount of hydraulic pressure, the inner slider of the double-action filling and stretching forming equipment drives the combined punch 4 to move down until it closes with the combined female die 1 5 and the combined female die 2 7, completing the vertical pre-bending of the tube blank. Then, it pushes the side-pushing female die 1 6 and the side-pushing female die 2 to close with the combined female die 1 5 and the combined female die 2 7, completing the horizontal pre-bending of the tube blank. S4. Control the upper template 1 to move downward, causing the upper inclined surface 1001 of the wedge transmission component 10 to cooperate with the lower inclined surface 902 of the slider 9. The slider 9 continues to push the feeding section 805 of the sealing pusher 8 to the tube blank. At the same time, according to the loading hydraulic curve, a higher liquid chamber pressure is loaded to match the advancement of the sealing pusher 8, so as to realize the expansion of the irregular surface inside the tube.

[0032] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A forming mold for a bidirectional bending variable diameter tube for an aero-engine, characterized in that, Includes upper template, lower template, combination mold, pressure block, sealing pusher and wedge drive components; The combined mold includes combined female mold one, combined female mold two, side-push female mold one, side-push female mold two, and combined punch. Combined female mold one and combined female mold two are fixed at intervals on the lower template. Side-push female mold one and side-push female mold two are slidably connected to the lower template, and side-push female mold one and side-push female mold two can be closed with combined female mold one and combined female mold two. The combined punch can be closed with combined female mold one, combined female mold two, side-push female mold one and side-push female mold two to form the profile of a bidirectional curved variable diameter pipe. The upper template is provided with a pressure block for fixing the tube blanks at both ends of the female mold. The two ends of the tube blank in the combined mold are provided with sealing push heads. The lower template is provided with a sliding slider. One end of the slider is connected to the sealing push head, and the other end is provided with an upper inclined surface 1 and a lower inclined surface 1 with different inclination angles. The upper template is also provided with a wedge transmission component. The wedge transmission component includes a lower inclined surface 2 that cooperates with the upper inclined surface 1 of the slider, and an upper inclined surface 2 that cooperates with the lower inclined surface 1 of the slider. The sealing pusher includes an inlet section, a flexible sealing section, a support section, a rigid sealing section, and a feeding section connected in sequence. The lengths of the flexible sealing section, the support section, and the rigid sealing section are the same as the feed strokes of the upper inclined surface one of the slider and the lower inclined surface two of the wedge transmission component. The length of the feeding section is the same as the feed strokes of the lower inclined surface one of the slider and the upper inclined surface two of the wedge transmission component. The sealing pusher is also provided with a filling port for filling liquid into the tube blank.

2. The forming mold for a bidirectional bending irregular diameter tube for aero-engines according to claim 1, characterized in that, The lower template is equipped with a slide rail, and the side-pushing female mold one and the side-pushing female mold two are connected to the lower template through the slide rail.

3. The forming mold for a bidirectional bending variable diameter tube for aero-engines according to claim 1, characterized in that, The pressure block is connected to the upper template via a spring.

4. The forming mold for a bidirectional bending variable diameter tube for aero-engines according to claim 1, characterized in that, The slider is provided with a liquid filling channel, which is connected to the liquid filling port of the sealing pusher.

5. The forming mold for a bidirectional bending variable diameter tube for aero-engines according to claim 1, characterized in that, The flexible sealing section has a groove on its outer periphery, and a rubber sealing ring is installed in the groove.

6. The forming mold for a bidirectional bending irregular diameter tube for aero-engines according to claim 1, characterized in that, The upper inclined surface of the slider has an inclination angle of 45°, and the lower inclined surface of the slider has an inclination angle of 50~60°; the upper inclined surface of the wedge transmission component has an inclination angle of 50~60°, and the lower inclined surface of the wedge transmission component has an inclination angle of 45°.

7. The forming mold for a bidirectional bending variable diameter tube for aero-engines according to claim 1, characterized in that, Wear-resistant blocks are provided on the upper inclined surface 2 and the lower inclined surface 2 of the wedge transmission component.

8. A bidirectional bending profiled variable diameter tube forming device for aero-engines, characterized in that, The invention includes the bidirectional bending shaped variable diameter tube forming mold for aero-engines and the double-action liquid filling stretching forming equipment as described in any one of claims 1 to 7. The inner slider and the combined punch of the double-action liquid filling stretching forming equipment are connected, the outer slider of the double-action liquid filling stretching forming equipment is connected to the upper template, and the liquid filling device of the double-action liquid filling stretching forming equipment is connected to the liquid filling port of the sealing pusher.

9. A method for forming a bidirectional bending variable diameter tube for an aero-engine, characterized in that, The forming method is based on the forming mold for bidirectional bending irregular diameter tubes for aero-engines as described in claim 1, and the steps include: S1. Place the tube blank on the combined female mold one and combined female mold two, insert the inlet section of the sealing push head into both ends, and install the slider connecting the liquid filling device on the end side of the sealing push head. S2. Drive the upper template to move down, press the material block to press the two ends of the tube blank, control the upper template to continue to move down, the lower inclined surface of the inclined wedge transmission component 2 contacts and cooperates with the upper inclined surface of the slider 1, under the action of the downward force of the inclined wedge transmission component, push the slider to move horizontally, the flexible sealing section of the sealing push head performs the first stage of sealing, and the sealing push head continues to advance the support section and rigid sealing section into the tube blank to achieve the second stage of sealing; S3. After filling the tube blank with liquid and applying a certain amount of hydraulic pressure, drive the combined punch to move down until it closes with the combined female die one and combined female die two to complete the vertical pre-bending of the tube blank. Then push the side-pushing female die one and side-pushing female die two to close with the combined female die one and combined female die two to complete the horizontal pre-bending of the tube blank. S4. Control the upper template to move downward, causing the upper inclined surface two of the wedge transmission component to cooperate with the lower inclined surface one of the slider. The slider continues to push the feeding section of the sealing pusher to the tube blank. At the same time, according to the loading hydraulic curve, a higher liquid chamber pressure is loaded to match the advancement of the sealing pusher, so as to realize the expansion of the irregular surface inside the tube.

10. The method for forming a bidirectional bending variable diameter tube for an aero-engine according to claim 9, characterized in that, The rigid sealing section is inclined, and the feed of the rigid sealing section and the pressure block squeeze the wall thickness of the tube blank to 0.6 to 0.7 times the wall thickness to achieve the second stage of sealing.

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