Machining method for deep-drawing step thin-wall guide sleeve of aero-engine

Abstract

The invention relates to the technical field of aero-engine manufacturing, in particular to an aero-engine deep-drawing deep-step thin-wall guide sleeve machining method which comprises the steps that S1, the structure of a deep-drawing part is determined, specifically, the structure of the deep-drawing part is designed according to the structure of a thin-wall guide sleeve, and the large port part of the deep-drawing part is provided with a flange edge; s2, the size of a blank is determined, specifically, the blank is a disc-shaped plate, and the diameter phi D of the blank is determined according to the surface area S of the deep drawing part; s3, the blank is pre-stretched through a pre-stretching die, and a pre-stretched part is obtained; s4, the flange edge of the pre-stretching part is trimmed; s5, a deep drawing die is adopted for conducting deep drawing on the trimmed pre-drawing part, and a deep drawing part is obtained; and S6, the deep drawing part is machined, and the thin-wall guide sleeve is obtained. The parts machined through the method are better in consistency and higher in quality, the one-time machining qualification rate of the parts is guaranteed, and the forming efficiency of the thin-wall guide sleeve parts is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engine manufacturing, and in particular to a method for processing a deep-drawn step thin-wall guide sleeve of an aero-engine. Background Art

[0002] Combination Figure 1 , Figure 2 The figure shows the structure diagram of the deep-drawn step thin-wall guide sleeve of an aircraft engine. The thin-wall guide sleeve is a deep-drawn part in the hydraulic actuator device of the engine. It is made of 0Cr18Ni9 material, with a wall thickness of 0.4mm, an outer diameter of the small end φB=37mm, an outer diameter of the large end φA=48mm, and a drawing height L=27mm; the height of the cylindrical surface of the large end of the part is t2=1mm; the large end and the small end of the part are smoothly transitioned through two arcs R5. 32 notches with a width of T=0.5mm are set at the small end of the part, and the distance from the bottom of the notch to the end face of the large end of the part is t1=20mm. The notch divides the small end of the part into 32 petals, and each petal is bent inward by an arc of R2 so that the inner diameter of the small end of the part is φb=34mm.

[0003] The thin-walled guide sleeve allows for segmented welding, but considering the quality impact of segmented welding and the difficulty in controlling the consistency of the part surface, and the subsequent processing of the notches at the small end 32 needs to be evenly distributed, there are high requirements for the roundness of the part; combined with the part structure, two processing methods can be used: deep drawing or bulging. In comparison, bulging parts will have bulging marks, which cannot be completely eliminated, while deep drawing can avoid this problem. However, during deep drawing, the dimensional accuracy of the forming raw material is required to be high. At the same time, deep drawing needs to consider the poor forming performance of the material and the insufficient and uneven material flow during the drawing process; in the early stage, a set of molds was used for two stretching processes, and the parts had insufficient and uneven material flow, resulting in obvious thinning, wrinkling, and cracking defects at the R of the small end of the processed part cylinder. Summary of the invention

[0004] The main purpose of the present invention is to provide a processing method for a deep-drawn stepped thin-walled guide sleeve of an aero-engine, aiming to solve the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides a method for processing a deep-drawn stepped thin-walled guide sleeve of an aero-engine, comprising:

[0006] Step S1, determining the structure of the deep-drawn part: according to the structure of the thin-walled guide sleeve, designing the structure of the deep-drawn part, wherein the large end portion of the deep-drawn part has a flange edge;

[0007] Step S2, determining the size of the rough material: the rough material is a disc-shaped plate material, and the diameter φD of the rough material is determined according to the surface area S of the deep-drawn part;

[0008] Step S3, using a pre-stretching die to pre-stretch the raw material to obtain a pre-stretched part;

[0009] Step S4, trimming the flange edge of the pre-stretched part;

[0010] Step S5, deep drawing the trimmed pre-stretched part using a deep drawing die to obtain a deep drawn part;

[0011] Step S6: machining the deep-drawn part to obtain a thin-walled guide sleeve.

[0012] Preferably, in step S1, when designing the structure of the deep-drawn part, UG is used for modeling, and the large end of the UG model of the thin-walled guide sleeve is extended by a distance of t3 and then folded outward to form the flange edge; the root of the flange edge adopts an arc transition; at the same time, the notch on the small end of the UG model of the thin-walled guide sleeve is removed and the through hole φb at the small end is closed to obtain the UG model of the deep-drawn part.

[0013] Preferably, when determining the rough material, the outer surface of the UG model of the deep-drawn part is measured by using the surface measurement function in UG to obtain the surface area S of the outer surface of the deep-drawn part, and the diameter φD of the rough material is calculated according to the following formula:

[0014]

[0015] Where: ω is the trimming allowance.

[0016] Preferably, the pre-stretching part is a hemispherical structure with a flange edge; the pre-stretching mold includes a first lower mold plate and a first upper mold plate; a first die is installed on the lower surface of the first upper mold plate, and a hemispherical depression is arranged at the center of the lower surface of the first die plate; a first punch is installed on the top surface of the first lower mold plate through a first fixed plate, and the top end of the first punch is a hemispherical structure; a first pad is arranged between the first fixed plate and the first lower mold plate, and the lower end of the first punch abuts against the first pad; a first unloading plate is arranged on the top surface of the first fixed plate, and the upper part of the first punch is slidably inserted in the center hole of the first unloading plate; a through-shaped first push rod hole is arranged on the assembly formed by the first lower mold plate, the first pad and the first fixed plate.

[0017] Preferably, a second unloading screw is provided on the assembly formed by the first lower template, the first pad and the first fixed plate, and the upper end of the second unloading screw is threadedly connected to the first unloading plate; a first unloading block is installed in the central through hole of the first die, and a first unloading screw is provided on the first upper template, and the lower end of the first unloading screw is threadedly connected to the first unloading block; a first spring is sleeved on the first unloading screw, and the first spring is placed in the central countersunk hole on the lower surface of the first upper template, and the upper end of the first spring abuts against the bottom wall of the countersunk hole of the first upper template, and the lower end abuts against the first unloading block.

[0018] Preferably, three material stop pins are evenly distributed on the top surface of the first unloading plate.

[0019] Preferably, in step S3, the pre-stretching operation step includes:

[0020] Step S301, installing the pre-stretching die on the hydraulic press, connecting the first lower die plate to the workbench of the hydraulic press, and connecting the first upper die plate to the pressing plate of the hydraulic press;

[0021] Step S302, the hydraulic press drives the first upper mold plate upward; at the same time, the push rod of the hydraulic press passes through the first push rod hole and pushes up the first stripper plate, so that the top surface of the first stripper plate is flush with the top of the first punch;

[0022] Step S303, placing the raw material on the first unloading plate, and positioning the raw material using three stopper pins;

[0023] Step S304, using a hydraulic press to drive the first upper template downward, the push rod of the hydraulic press is synchronously lowered to make the first unloading plate move downward; the hemispherical depression of the first concave die and the hemisphere at the top of the first convex die jointly pre-stretch the raw material to form a pre-stretched part;

[0024] Step S305: After the pressure is maintained, the first upper mold plate is driven upward by the hydraulic press, and at the same time, the push rod of the hydraulic press pushes up the first unloading plate, so that the push rod of the hydraulic press stops rising after the pre-stretched part is separated from the first punch;

[0025] Step S306, using a hydraulic press to drive the first upper mold plate to continue to move upward, so that the first die and the first unloading plate are separated from each other, and the first unloading block is pushed downward under the action of the first spring to eject the pre-stretched part from the hemispherical depression of the first die, and the pre-stretched part can be taken out.

[0026] Preferably, the deep drawing die includes a second lower template and a second upper template; an upper pad and a second die are sequentially installed on the lower surface of the second upper template; a second punch is installed on the top surface of the second lower template through a second fixed plate; a second pad is arranged between the second fixed plate and the second lower template, and the lower end of the second punch abuts against the second pad; a second stripping plate is arranged on the top surface of the second fixed plate, and the upper part of the second punch is slidably inserted in the center hole of the second stripping plate; a through-shaped second ejector hole is arranged on the assembly formed by the second lower template, the second pad and the second fixed plate.

[0027] Preferably, a fourth unloading screw is provided on the assembly formed by the second lower template, the second pad and the second fixed plate, and the upper end of the fourth unloading screw is threadedly connected to the second unloading plate; a second unloading block is installed in the central through hole of the second die, and a third unloading screw is provided in the central hole of the second upper template and the upper pad, and the lower end of the third unloading screw is threadedly connected to the second unloading block; a second spring is sleeved on the third unloading screw, and the second spring is placed in the central hole of the upper pad, and the upper end of the second spring abuts against the bottom surface of the second upper template, and the lower end abuts against the second unloading block.

[0028] Preferably, in step S5, the deep drawing operation steps include:

[0029] Step S501, installing the deep drawing die on the hydraulic press, connecting the second lower die plate to the workbench of the hydraulic press, and connecting the second upper die plate to the pressing plate of the hydraulic press;

[0030] Step S502, the hydraulic press drives the second upper mold plate upward; at the same time, the push rod of the hydraulic press passes through the second push rod hole and pushes up the second stripper plate, so that the top surface of the middle annular platform of the second stripper plate is flush with the top of the second punch;

[0031] Step S503, buckle the trimmed pre-stretched parts on the annular table in the middle of the second unloading plate for positioning;

[0032] Step S504, using a hydraulic press to drive the second upper template downward, the hydraulic press's push rod is synchronously lowered to cause the second stripper plate to move downward; the second concave die, the second convex die and the annular table of the second stripper plate jointly perform deep drawing on the pre-stretched part to form a deep drawn part;

[0033] Step S505, after the pressure is maintained, the second upper mold plate is driven upward by the hydraulic press, and at the same time, the ejector rod of the hydraulic press lifts up the second stripper plate, so that the ejector rod of the hydraulic press stops rising after the deep-drawn part is separated from the second punch;

[0034] Step S506, using the hydraulic press to drive the second upper mold plate to continue to move upward, so that the second die and the second unloading plate are separated from each other, and the second unloading block is pushed downward under the action of the second spring to eject the deep-drawn part from the die hole of the second die, and the deep-drawn part can be taken out.

[0035] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0036] (1) Compared with the traditional method, the processing method provided by the present invention does not require segmented welding of the processed thin-walled guide sleeve parts, so there is no processing quality problem caused by welding, and the overlapping phenomenon of the bottle due to thinning, wrinkling, and cracking during the processing of the deep-drawn step thin-walled guide sleeve is avoided, and the molding quality is high.

[0037] (2) The processing method provided by the present invention is more reliable, and the processed parts have better consistency and higher quality, which ensures the qualified rate of parts processed in one time and greatly improves the forming efficiency of thin-walled guide sleeve parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 This is the front view of the deep-drawn step thin-wall guide sleeve for an aircraft engine;

[0040] Figure 2 This is the front view of the deep-drawn step thin-wall guide sleeve for an aircraft engine;

[0041] Figure 3 It is a schematic diagram of the structure of a deep drawn part;

[0042] Figure 4 It is a structural schematic diagram of the pre-drawn part;

[0043] Figure 5 It is a structural schematic diagram of the pre-drawing die;

[0044] Figure 6 It is a structural schematic diagram of the deep drawing die;

[0045] Figure 7 This is a schematic diagram of the structure of the wool material.

[0046] Description of the accompanying drawings: 1. first lower template; 2. first pad; 3. first punch; 4. first fixed plate; 5. first unloading plate; 6. first die; 7. first unloading block; 8. first spring; 9. first unloading screw; 10. stop pin; 11. second unloading screw; 12. first upper template; 13. first lifting bolt; 14. second lower template; 15. second pad; 16. second punch; 17. second fixed plate; 18. second unloading plate; 1 9. Second die; 20. Second unloading block; 21. Second spring; 22. Third unloading screw; 23. Latch; 24. Fourth unloading screw; 25. Second upper mold plate; 26. Second lifting bolt; 27. Upper pad; 28. Screw; 29. ​​Guide column; 30. Guide sleeve; 31. First push rod hole; 32. Second push rod hole; 100. Deep-drawn part; 101. Flange; 200. Raw material; 300. Pre-stretched part; 400. Thin-walled guide sleeve. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] Combination Figure 1 , Figure 2The figure shows the structure diagram of the deep-drawn step thin-wall guide sleeve of an aircraft engine. The thin-wall guide sleeve 400 is a deep-drawn part in the hydraulic actuator device of the engine. It is made of 0Cr18Ni9 material, with a wall thickness of 0.4mm, an outer diameter of the small end φB=37mm, an outer diameter of the large end φA=48mm, and a drawing height L=27mm; the height of the cylindrical surface of the large end of the part is t2=1mm; the large end and the small end of the part are smoothly transitioned through two arcs R5. 32 notches with a width of T=0.5mm are set at the small end of the part, and the distance from the bottom of the notch to the end face of the large end of the part is t1=20mm. The notch divides the small end of the part into 32 petals, and each petal is bent inward by an arc of R2 so that the inner diameter of the small end of the part is φb=34mm.

[0051] Combination Figures 2 to 7 As shown, a specific embodiment of a method for processing a deep-drawn stepped thin-walled guide sleeve of an aircraft engine provided by the present invention is used to process a thin-walled guide sleeve 400, and the steps include:

[0052] Step S1, determining the structure of the deep-drawn part: according to the structure of the thin-walled guide sleeve 400, designing the structure of the deep-drawn part 100, the large end portion of the deep-drawn part 100 has a flange edge 101;

[0053] Step S2, determining the size of the blank 200: the blank 200 is a disc-shaped plate material, and the diameter φD of the blank 200 is determined according to the surface area S of the deep-drawn part 100;

[0054] Step S3, pre-stretching the raw material 200 by using a pre-stretching die to obtain a pre-stretched part 300, wherein the pre-stretched part 300 is a hemispherical structure with a flange edge; the inner diameter of the spherical part is SR24mm;

[0055] Step S4, trimming the flange edge of the pre-stretched part 300 to remove the excess of the flange edge;

[0056] Step S5, deep drawing the trimmed pre-stretched part 300 using a deep drawing die to obtain a deep drawn part 100;

[0057] Step S6, machining the deep-drawn part 100, machining the inner hole φb of the small end portion of the part, 32 slots with a width T=0.5mm, and cutting the large end of the part to ensure that the part height L=27mm, thereby obtaining a thin-walled guide sleeve 400.

[0058] In order to avoid the reduction of the overall quality of the parts due to the segmented forming and welding processing, the thin-walled guide sleeve 400 can be formed by deep drawing with flange or deep drawing without flange. The deep drawing without flange requires less raw material, but the relative deep drawing forming stability is slightly worse and the drawing coefficient is large. The deep drawing with flange is not easy to wrinkle, has a small drawing coefficient and high deep drawing forming accuracy. Therefore, in this embodiment, the thin-walled guide sleeve 400 is formed by deep drawing with flange.

[0059] Combination Figure 3 As shown, in the step S1, when designing the structure of the deep-drawn part 100, UG is used for modeling, and the large end of the UG model of the thin-walled guide sleeve 400 is extended by a distance of t3=3mm and then folded outward to form the flange edge 101, and the width of the flange edge 101 is t4=5mm; the root of the flange edge 101 is transitioned by an arc R5; at the same time, the notch on the small end of the UG model of the thin-walled guide sleeve 400 is removed and the through hole φb at the small end is closed to obtain the UG model of the deep-drawn part 100.

[0060] Combination Figure 3 , Figure 7 As shown, in the non-thinning drawing, although the material thickness varies, its average value is very close to the thickness of the rough material 200, so it is calculated based on the principle that the area of ​​the rough material 200 is equal to the area of ​​the deep-drawn part 100. Specifically, when determining the rough material 200, the outer surface of the UG model of the deep-drawn part 100 is measured by using the measurement surface function in UG to obtain the surface area S of the outer surface of the deep-drawn part 100, and the diameter φD of the rough material 200 is calculated according to the following formula:

[0061]

[0062] Where: ω is the trimming allowance.

[0063] In this embodiment, the surface measurement function is used in UG to measure the surface area S of the outer surface of the deep-drawn part 100 = 7372.4021 mm 2 ,but In the deep drawing process, the mouth or edge of the drawn part is often uneven due to the directionality of the mechanical properties of the material, uneven mold gap, changes in plate thickness, unequal friction resistance and inaccurate positioning, and trimming is necessary. Therefore, a certain trimming allowance ω should be added when calculating the blank size. According to the diameter and height of the deep drawn part 100, the trimming allowance ω is determined to be 3mm. Therefore, the diameter of the blank 200 is φD = 97 + 3 = 100mm.

[0064] Combination Figure 4 , Figure 5As shown, the pre-stretching die includes a first lower die plate 1 and a first upper die plate 12; a guide column 29 is provided on the first lower die plate 1, and a guide sleeve 30 is provided on the first upper die plate 12, and the guide column 29 is slidably inserted in the inner hole of the guide sleeve 30. A first die 6 is fixedly installed on the lower surface of the first upper die plate 12 by pins and screws, and a hemispherical depression is provided at the center of the lower surface of the first die 6; a first punch 3 is installed on the top surface of the first lower die plate 1 by a first fixing plate 4, and the top end of the first punch 3 is a hemispherical structure; a first pad 2 is provided between the first fixing plate 4 and the first lower die plate 1, and the lower end of the first punch 3 abuts against the first pad 2; the annular boss at the lower end of the first punch 3 is clamped in the countersunk hole of the first fixing plate 4. The first fixing plate 4, the first pad 2 and the first lower die plate 1 are fastened and connected by screws and pins. A first stripper plate 5 is provided on the top surface of the first fixed plate 4, and the upper part of the first punch 3 is slidably inserted into the center hole of the first stripper plate 5; a through-shaped first ejector hole 31 is provided on the assembly formed by the first lower template 1, the first pad 2, and the first fixed plate 4. First lifting bolts 13 are respectively provided on the side surfaces of the first lower template 1 and the first upper template 12.

[0065] Furthermore, a second unloading screw 11 is provided on the assembly formed by the first lower template 1, the first pad 2, and the first fixed plate 4, and the upper end of the second unloading screw 11 is threadedly connected to the first unloading plate 5; a first unloading block 7 is installed in the central through hole of the first concave mold 6, and the lower end of the first unloading block 7 is set as a spherical surface. When the top surface of the first unloading block 7 abuts against the bottom surface of the first upper template 12, the spherical profile of the first unloading block 7 smoothly transitions with the profile of the first concave mold 6, and the profile radius of the first unloading block 7 is the same as the profile radius of the first concave mold 6. A first unloading screw 9 is provided on the first upper template 12, and the lower end of the first unloading screw 9 is threadedly connected to the first unloading block 7; a first spring 8 is sleeved on the first unloading screw 9, and the first spring 8 is placed in the central countersunk hole on the lower surface of the first upper template 12, and the upper end of the first spring 8 abuts against the bottom wall of the countersunk hole of the first upper template 12, and the lower end abuts against the first unloading block 7. Three material blocking pins 10 are evenly distributed on the top surface of the first unloading plate 5 .

[0066] By adopting the above-mentioned pre-stretching die, in the step S3, the pre-stretching operation steps include:

[0067] Step S301, installing the pre-stretching die on the hydraulic press, connecting the first lower die plate 1 to the workbench of the hydraulic press, and connecting the first upper die plate 12 to the pressing plate of the hydraulic press;

[0068] Step S302, the hydraulic press drives the first upper mold plate 12 upward; at the same time, the push rod of the hydraulic press passes through the first push rod hole 31 and pushes up the first stripper plate 5, so that the top surface of the first stripper plate 5 is flush with the top of the first punch 3;

[0069] Step S303, placing the rough material 200 on the first unloading plate 5, and using three stopper pins 10 to position the rough material 200;

[0070] Step S304, using a hydraulic press to drive the first upper template 12 downward, the push rod of the hydraulic press synchronously descends to make the first unloading plate 5 descend; the hemispherical depression of the first concave die 6 and the hemisphere at the top of the first convex die 3 jointly pre-stretch the raw material 200 to form a pre-stretched part 300;

[0071] Step S305, after the pressure is maintained, the first upper mold plate 12 is driven upward by the hydraulic press, and at the same time, the push rod of the hydraulic press lifts up the first stripper plate 5, so that the push rod of the hydraulic press stops rising after the pre-stretched part 300 is separated from the first punch 3;

[0072] Step S306, use the hydraulic press to drive the first upper template 12 to continue to move upward, so that the first die 6 and the first unloading plate 5 are separated from each other, and the first unloading block 7 is pushed downward under the action of the first spring 8 to eject the pre-stretched part 300 from the hemispherical depression of the first die 6, and the pre-stretched part 300 can be taken out.

[0073] Combination Figure 6 As shown, the deep drawing die includes a second lower die plate 14 and a second upper die plate 25; a guide column 29 is provided on the second lower die plate 14, and a guide sleeve 30 is provided on the second upper die plate 25, and the guide column 29 is slidably inserted in the inner hole of the guide sleeve 30. An upper pad 27 and a second die 19 are sequentially installed on the lower surface of the second upper die plate 25. The second upper die plate 25 is fastened to the upper pad 27 and the second die 19 by pins and screws. A second punch 16 is installed on the top surface of the second lower die plate 14 through a second fixed plate 17; a second pad 15 is provided between the second fixed plate 17 and the second lower die plate 14, and the lower end of the second punch 16 abuts against the second pad 15. The annular boss at the lower end of the second punch 16 is clamped in the countersunk hole of the second fixed plate 17. The second fixed plate 17, the second pad 15 and the second lower die plate 14 are fastened to each other by screws and pins. A second stripper plate 18 is disposed on the top surface of the second fixed plate 17, and the upper portion of the second punch 16 is slidably inserted into the center hole of the second stripper plate 18; a through second ejector hole 32 is disposed on the assembly formed by the second lower template 14, the second pad 15, and the second fixed plate 17. Second lifting bolts 26 are disposed on the side surfaces of the second lower template 14 and the second upper template 25, respectively.

[0074] Furthermore, a fourth unloading screw 24 is provided on the assembly formed by the second lower template 14, the second pad 15 and the second fixed plate 17, and the upper end of the fourth unloading screw 24 is threadedly connected to the second unloading plate 18; a second unloading block 20 is installed in the central through hole of the second die 19, and a third unloading screw 22 is provided in the central hole of the second upper template 25 and the upper pad 27, and the lower end of the third unloading screw 22 is threadedly connected to the second unloading block 20; a second spring 21 is sleeved on the third unloading screw 22, and the second spring 21 is placed in the central hole of the upper pad 27, and the upper end of the second spring 21 abuts against the bottom surface of the second upper template 25, and the lower end abuts against the second unloading block 20.

[0075] By adopting the above-mentioned deep drawing die, in the step S5, the operation steps of deep drawing include:

[0076] Step S501, the deep drawing die is installed on the hydraulic press, the second lower template 14 is connected to the workbench of the hydraulic press, and the second upper template 25 is connected to the pressing plate of the hydraulic press;

[0077] Step S502, the hydraulic press drives the second upper mold plate 25 upward; at the same time, the push rod of the hydraulic press passes through the second push rod hole 32 and pushes up the second stripper plate 18, so that the top surface of the middle annular platform of the second stripper plate 18 is flush with the top of the second punch 16;

[0078] Step S503, buckle the trimmed pre-stretched part 300 on the annular table in the middle of the second unloading plate 18 for positioning;

[0079] Step S504, the second upper mold plate 25 is driven downward by a hydraulic press, and the push rod of the hydraulic press is synchronously lowered to make the second stripper plate 18 move downward; the second concave die 19, the second convex die 16 and the annular table of the second stripper plate 18 jointly perform deep drawing on the pre-stretched part 300 to form a deep-drawn part 100;

[0080] Step S505, after the pressure is maintained, the second upper mold plate 25 is driven upward by the hydraulic press, and at the same time, the ejector rod of the hydraulic press lifts up the second stripper plate 18, so that the ejector rod of the hydraulic press stops rising after the deep-drawn part 100 is separated from the second punch 16;

[0081] Step S506, use the hydraulic press to drive the second upper mold plate 25 to continue to move upward, so that the second die 19 and the second unloading plate 18 are separated from each other, and the second unloading block 220 is pushed downward under the action of the second spring 21 to eject the deep-drawn part 100 from the mold hole of the second die 19, and the deep-drawn part 100 can be taken out.

[0082] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for processing a deep-drawn step thin-walled guide sleeve for an aircraft engine, characterized in that: include: Step S1, determining the structure of the deep-drawn part: according to the structure of the thin-walled guide sleeve (400), the structure of the deep-drawn part (100) is designed, and the large end portion of the deep-drawn part (100) is provided with a flange edge (101); Step S2, determining the size of the blank (200): the blank (200) is a disc-shaped plate material, and the diameter φD of the blank (200) is determined according to the surface area S of the deep-drawn part (100); Step S3, using a pre-stretching die to pre-stretch the raw material (200) to obtain a pre-stretched part (300); Step S4, trimming the flange edge of the pre-stretched part (300); Step S5, deep drawing the trimmed pre-stretched part (300) using a deep drawing die to obtain a deep drawn part (100); Step S6: machining the deep-drawn part (100) to obtain a thin-walled guide sleeve (400).

2. A method for processing a deep-drawn stepped thin-walled guide sleeve for an aircraft engine as claimed in claim 1, characterized in that: In the step S1, when designing the structure of the deep-drawn part (100), UG modeling is used, and the large end of the UG model of the thin-walled guide sleeve (400) is extended by a distance t3 and then folded outward to form the flange edge (101); the root of the flange edge (101) adopts an arc transition; at the same time, the notch on the small end of the UG model of the thin-walled guide sleeve (400) is removed and the through hole φb of the small end is closed, thereby obtaining the UG model of the deep-drawn part (100).

3. A method for processing a deep-drawn stepped thin-walled guide sleeve for an aircraft engine as claimed in claim 2, characterized in that: When determining the rough material (200), the outer surface of the UG model of the deep-drawn part (100) is measured by using the surface measurement function in UG to obtain the surface area S of the outer surface of the deep-drawn part (100), and the diameter φD of the rough material (200) is calculated according to the following formula: Where: δ is the trimming allowance.

4. A method for processing a deep-drawn stepped thin-walled guide sleeve for an aircraft engine as claimed in claim 1, characterized in that: The pre-stretching part (300) is a hemispherical structure with a flange edge; the pre-stretching mold comprises a first lower mold plate (1) and a first upper mold plate (12); a first die (6) is installed on the lower surface of the first upper mold plate (12), and a hemispherical depression is arranged at the center of the lower surface of the first die (6); a first punch (3) is installed on the top surface of the first lower mold plate (1) through a first fixed plate (4), and the top end of the first punch (3) is a hemispherical structure; a first pad (2) is arranged between the first fixed plate (4) and the first lower mold plate (1), and the lower end of the first punch (3) abuts against the first pad (2); a first stripping plate (5) is arranged on the top surface of the first fixed plate (4), and the upper part of the first punch (3) is slidably inserted in the center hole of the first stripping plate (5); a through-shaped first ejector hole (31) is arranged on the assembly formed by the first lower mold plate (1), the first pad (2) and the first fixed plate (4).

5. A method for processing a deep-drawn stepped thin-walled guide sleeve for an aircraft engine as claimed in claim 4, characterized in that: A second unloading screw (11) is provided on the assembly formed by the first lower template (1), the first pad (2) and the first fixed plate (4), and the upper end of the second unloading screw (11) is threadedly connected to the first unloading plate (5); a first unloading block (7) is installed in the central through hole of the first concave mold (6), and a first unloading screw (9) is provided on the first upper template (12), and the lower end of the first unloading screw (9) is threadedly connected to the first unloading block (7); a first spring (8) is sleeved on the first unloading screw (9), and the first spring (8) is placed in the central countersunk hole on the lower surface of the first upper template (12), and the upper end of the first spring (8) abuts against the bottom wall of the countersunk hole of the first upper template (12), and the lower end abuts against the first unloading block (7).

6. A method for processing a deep-drawn stepped thin-walled guide sleeve for an aircraft engine as claimed in claim 5, characterized in that: Three material blocking pins (10) are evenly distributed on the top surface of the first unloading plate (5).

7. A method for processing a deep-drawn stepped thin-walled guide sleeve for an aircraft engine as claimed in claim 6, characterized in that: In step S3, the pre-stretching operation steps include: Step S301, installing the pre-stretching die on a hydraulic press, connecting the first lower die plate (1) to the workbench of the hydraulic press, and connecting the first upper die plate (12) to the pressing plate of the hydraulic press; Step S302: The hydraulic press drives the first upper mold plate (12) upward; at the same time, the push rod of the hydraulic press passes through the first push rod hole (31) and pushes up the first stripping plate (5), so that the top surface of the first stripping plate (5) is flush with the top of the first punch (3); Step S303, placing the rough material (200) on the first unloading plate (5), and positioning the rough material (200) using three stopper pins (10); Step S304, using a hydraulic press to drive the first upper mold plate (12) downward, the push rod of the hydraulic press is synchronously lowered to make the first unloading plate (5) downward; the hemispherical depression of the first concave mold (6) and the hemisphere at the top of the first convex mold (3) jointly pre-stretch the raw material (200) to form a pre-stretched part (300); Step S305, after the pressure is maintained, the first upper mold plate (12) is driven upward by a hydraulic press, and at the same time, the push rod of the hydraulic press pushes up the first unloading plate (5), so that the push rod of the hydraulic press stops rising after the pre-stretched part (300) is separated from the first punch (3); Step S306, using a hydraulic press to drive the first upper mold plate (12) to continue to move upward, so that the first die (6) and the first unloading plate (5) are separated from each other, and the first unloading block (7) is pushed downward under the action of the first spring (8), and the pre-stretched part (300) is ejected from the hemispherical depression of the first die (6), and the pre-stretched part (300) is taken out.

8. A method for processing a deep-drawn stepped thin-walled guide sleeve for an aircraft engine as claimed in claim 1, characterized in that: The deep drawing die comprises a second lower die plate (14) and a second upper die plate (25); an upper pad (27) and a second die (19) are sequentially mounted on the lower surface of the second upper die plate (25); a second punch (16) is mounted on the top surface of the second lower die plate (14) via a second fixed plate (17); a second pad (15) is arranged between the second fixed plate (17) and the second lower die plate (14), and the lower end of the second punch (16) abuts against the second pad (15); a second stripping plate (18) is arranged on the top surface of the second fixed plate (17), and the upper part of the second punch (16) is slidably inserted into the center hole of the second stripping plate (18); a through-shaped second ejector hole (32) is arranged on the assembly formed by the second lower die plate (14), the second pad (15) and the second fixed plate (17).

9. A method for processing a deep-drawn stepped thin-walled guide sleeve for an aircraft engine as claimed in claim 8, characterized in that: A fourth unloading screw (24) is inserted into the assembly formed by the second lower mold plate (14), the second pad (15) and the second fixed plate (17), and the upper end of the fourth unloading screw (24) is threadedly connected to the second unloading plate (18); a second unloading block (20) is installed in the central through hole of the second die (19), and a third unloading screw (22) is inserted into the central holes of the second upper mold plate (25) and the upper pad (27), and the lower end of the third unloading screw (22) is threadedly connected to the second unloading block (20); a second spring (21) is sleeved on the third unloading screw (22), and the second spring (21) is placed in the central hole of the upper pad (27), and the upper end of the second spring (21) abuts against the bottom surface of the second upper mold plate (25), and the lower end abuts against the second unloading block (20).

10. A method for processing an aircraft engine deep-drawn stepped thin-wall guide sleeve as claimed in claim 9, characterized in that: In step S5, the deep drawing operation steps include: Step S501, installing the deep drawing die on the hydraulic press, connecting the second lower template (14) to the working table of the hydraulic press, and connecting the second upper template (25) to the pressing plate of the hydraulic press; Step S502, the hydraulic press drives the second upper mold plate (25) upward; at the same time, the push rod of the hydraulic press passes through the second push rod hole (32) and pushes up the second stripper plate (18), so that the top surface of the middle annular platform of the second stripper plate (18) is flush with the top of the second punch (16); Step S503, buckle the trimmed pre-stretched part (300) on the annular table in the middle of the second unloading plate (18) for positioning; Step S504, using a hydraulic press to drive the second upper mold plate (25) downward, the push rod of the hydraulic press is synchronously lowered to make the second stripper plate (18) downward; the second concave mold (19), the second convex mold (16) and the annular table of the second stripper plate (18) jointly perform deep drawing on the pre-stretched part (300) to form a deep-drawn part (100); Step S505, after the pressure is maintained, the second upper mold plate (25) is driven upward by the hydraulic press, and at the same time, the push rod of the hydraulic press pushes up the second stripper plate (18), so that the push rod of the hydraulic press stops rising after the deep-drawn part (100) is separated from the second punch (16); Step S506, using a hydraulic press to drive the second upper mold plate (25) to continue to move upward, so that the second die (19) and the second unloading plate (18) are separated from each other, and the second unloading block (220) is pushed downward under the action of the second spring (21), and the deep-drawn part (100) is ejected from the mold hole of the second die (19), and the deep-drawn part (100) is taken out.

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