A method for superplastic forming of a two-way cylindrical blank and a two-way cylinder

Abstract

The application discloses a kind of two-way cylinder blank and two-way cylinder superplastic forming method, belong to lightweight structure design and superplastic forming field, solve the problem of poor two-way cylinder lightweight in prior art, high scrap rate of parts rework.The blank includes left arc plate, left head, left elbow plate, shunt crotch, right elbow plate, right head, right arc plate and bottom plate;Left arc plate and left elbow plate enclose one of the fluid passages of two-way cylinder blank, right arc plate and right elbow plate enclose another fluid passage of two-way cylinder blank;The upper end of left arc plate and the upper end of left elbow plate are connected with left head, the lower end of left elbow plate is connected with one side of shunt crotch, the upper end of right arc plate and right elbow plate is connected with right head, the lower end of right elbow plate is connected with the other side of shunt crotch, the lower end of shunt crotch is connected with the side surface of left arc plate and right arc plate respectively, and the lower end of left arc plate and right arc plate is connected with bottom plate.The application can be used for the superplastic forming of two-way cylinder.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of lightweight structure design and superplastic forming, and particularly relates to a two-way cylinder blank and a superplastic forming method of a two-way cylinder. BACKGROUND

[0002] The two-way cylinder can be manufactured in the following two ways:

[0003] In one way, a multi-section skin or shell is adopted, local casting machining frames and ribs are adopted, and features such as front and rear end frames are adopted to form a part butt joint structure.

[0004] In another way, a whole casting or 3D printing blank is adopted, and then machining is performed.

[0005] However, such a part inevitably brings problems such as a relatively thick wall thickness, a limited degree of lightweight, and the like, and high precision requirements of the part in a product assembly process, which leads to frequent part rework and scrapping, and seriously affects the manufacturing cycle, efficiency and quality control cost of the part. SUMMARY

[0006] In view of the above analysis, the application aims to provide a two-way cylinder blank and a superplastic forming method of a two-way cylinder, which solves the problems of poor lightweight of the two-way cylinder and high part rework and scrapping rate in the prior art.

[0007] The purpose of the application is mainly achieved by the following technical solutions:

[0008] The application provides a two-way cylinder blank, which comprises a left arc plate, a left head, a left bending plate, a shunt crotch, a right bending plate, a right head, a right arc plate and a bottom plate; the left arc plate and the left bending plate enclose one fluid passage of the two-way cylinder blank, and the right arc plate and the right bending plate enclose another fluid passage of the two-way cylinder blank; the upper end of the left arc plate and the upper end of the left bending plate are connected with the left head, the lower end of the left bending plate is connected with one side of the shunt crotch, the upper ends of the right arc plate and the right bending plate are connected with the right head, the lower end of the right bending plate is connected with the other side of the shunt crotch, the lower end of the shunt crotch is connected with the side surfaces of the left arc plate and the right arc plate respectively, and the lower ends of the left arc plate and the right arc plate are connected with the bottom plate, so as to form an internal closed two-way cylinder blank.

[0009] Further, the left head, the right head and the bottom plate are flat plate parts.

[0010] Further, the left bending plate has a concave cross-sectional shape, including a first left chamfer plate, a first left flat plate, a second left chamfer plate, a second left flat plate, a third left chamfer plate, a third left flat plate and a fourth left chamfer plate connected in sequence, the first left flat plate is fixedly connected with one side of the left arc plate through the first left chamfer plate, the third left flat plate is fixedly connected with the other side of the left arc plate through the fourth left chamfer plate, so as to enclose one fluid passage of the two-pass barrel blank, and the first left chamfer plate, the second left chamfer plate, the third left chamfer plate and the fourth left chamfer plate are all located at chamfered portions.

[0011] Further, the right bending plate has a concave cross-sectional shape, including a first right chamfer plate, a first right flat plate, a second right chamfer plate, a second right flat plate, a third right chamfer plate, a third right flat plate and a fourth right chamfer plate connected in sequence, the first right flat plate is fixedly connected with one side of the right arc plate through the first right chamfer plate, the third right flat plate is fixedly connected with the other side of the right arc plate through the fourth right chamfer plate, so as to enclose the other fluid passage of the two-pass barrel blank, and the first right chamfer plate, the second right chamfer plate, the third right chamfer plate and the fourth right chamfer plate are all located at chamfered portions.

[0012] Further, the split crotch includes a first crotch chamfer plate, a first trapezoidal transition flat plate, a second crotch chamfer plate, a first crotch flat plate, a third crotch chamfer plate, a second trapezoidal transition flat plate and a fourth crotch chamfer plate connected in sequence.

[0013] Further, the lower end of the first left chamfer plate is connected with one side of the first crotch chamfer plate, the upper end of the first left chamfer plate is connected with the left end cover, the lower end of the first right chamfer plate is connected with the other side of the first crotch chamfer plate, and the upper end of the first right chamfer plate is connected with the right end cover; the lower end of the first left flat plate is connected with one side of the first trapezoidal transition flat plate, the upper end of the first left flat plate is connected with the left end cover, the lower end of the first right flat plate is connected with the other side of the first trapezoidal transition flat plate, and the upper end of the first right flat plate is connected with the right end cover; the lower end of the second left chamfer plate is connected with one side of the second crotch chamfer plate, the upper end of the second left chamfer plate is connected with the left end cover, the lower end of the second right chamfer plate is connected with the other side of the second crotch chamfer plate, and the upper end of the second right chamfer plate is connected with the right end cover; the lower end of the second left flat plate is connected with one side of the first crotch flat plate, the upper end of the second left flat plate is connected with the left end cover, the lower end of the second right flat plate is connected with the other side of the first crotch flat plate, and the upper end of the second right flat plate is connected with the right end cover; the lower end of the third left chamfer plate is connected with one side of the third crotch chamfer plate, the upper end of the third left chamfer plate is connected with the left end cover, the lower end of the third right chamfer plate is connected with the other side of the third crotch chamfer plate, and the upper end of the third right chamfer plate is connected with the right end cover; the lower end of the third left flat plate is connected with one side of the second trapezoidal transition flat plate, the upper end of the third left flat plate is connected with the left end cover, the lower end of the third right flat plate is connected with the other side of the second trapezoidal transition flat plate, and the upper end of the third right flat plate is connected with the right end cover; the lower end of the fourth left chamfer plate is connected with one side of the fourth crotch chamfer plate, the upper end of the fourth left chamfer plate is connected with the left end cover, the lower end of the fourth right chamfer plate is connected with the other side of the fourth crotch chamfer plate, and the upper end of the fourth right chamfer plate is connected with the right end cover.

[0014] Further, the baffle is arranged on the split crotch, and the space in the two-pass barrel blank is divided into two forming cavities by the baffle.

[0015] Further, the edge shape of the left end cover is conformal to the shape surrounded by the upper end of the left arc plate and the upper end of the left bending plate.

[0016] Further, the edge shape of the right end cover is conformal to the shape surrounded by the upper end of the right arc plate and the upper end of the right bending plate.

[0017] The application also provides a superplastic forming method of a two-pass barrel, which comprises the following steps:

[0018] Step 1: providing a two-pass barrel blank and a male die and a female die matched with each other;

[0019] Step 2: placing the two-pass barrel blank in the female die and pressing the die closed;

[0020] Step 3: softening the two-pass barrel blank by heating;

[0021] Step 4: gradually fitting the two-pass barrel blank to the male die and the female die, and completing the superplastic forming of the two-pass barrel.

[0022] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0023] A) The two-way cylindrical blank provided by the present application is simplified and disassembled by analyzing the wall structure of the two-way cylindrical body, and the complex curved surface of the two-way cylindrical body is decomposed into a left arc plate, a left bending plate, a shunt crotch, a right bending plate and a right arc plate, so that the two-way cylindrical blank has manufacturing feasibility. In addition, the left arc plate, the left end cover, the left bending plate, the shunt crotch, the right bending plate, the right end cover, the right arc plate and the bottom plate form an internally sealed two-way cylindrical blank, so that superplastic forming of the two-way cylindrical body can be realized.

[0024] B) The two-way cylindrical blank provided by the present application adopts the structure of the two-way cylindrical blank, and the left arc plate, the left bending plate, the right bending plate and the right arc plate can generate upward pulling driving force in the forming process, so that the shunt crotch can be attached to the convex die.

[0025] C) The two-way cylindrical blank provided by the present application needs to design parts whose material is stretched and deformed in the shunt crotch and the transition fillet area of the two-way cylindrical body according to the function, structure and forming difficulty of the two-way cylindrical body. Therefore, a trapezoidal transition area is designed at the shunt crotch position, and obtuse angle transition plates (for example, first, second, third, fourth left chamfer plates, first, second, third, fourth right chamfer plates, first, second, third and fourth crotch chamfer plates) are designed in the shunt crotch and the transition fillet area of the two-way cylindrical body, so as to prevent the two-way cylindrical blank from being broken in forming. Because this shape can control the deformation mode to be mainly tensile deformation, and the shear deformation is approximately zero.

[0026] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings: BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Structure schematic view of the two-way cylindrical blank provided by the first embodiment of the present application;

[0030] Figure 2 Decomposition schematic view of the blank in the superplastic forming method of the two-way cylindrical body provided by the first embodiment of the present application;

[0031] Figure 3 Flow chart of the superplastic forming method of the two-pass barrel provided in embodiment two of the present application;

[0032] Figure 4 Structure diagram of the punch and the die in the superplastic forming method of the two-pass barrel provided in embodiment two of the present application;

[0033] Figure 5 Structure diagram of the punch in the superplastic forming method of the two-pass barrel provided in embodiment two of the present application;

[0034] Figure 6 Structure diagram of the die in the superplastic forming method of the two-pass barrel provided in embodiment two of the present application;

[0035] Figure 7 Assembly diagram of the blank and the punch and the die in the superplastic forming method of the two-pass barrel provided in embodiment two of the present application;

[0036] Figure 8 Structure diagram of the two-pass barrel prepared by the superplastic forming method of the two-pass barrel provided in embodiment two of the present application.

[0037] Reference signs:

[0038] 100 - two-pass barrel; 200 - two-pass barrel blank; 201 - left arc plate; 202 - left head; 203 - left bending plate; 204 - shunt crotch; 205 - right bending plate; 206 - right head; 207 - right arc plate; 208 - bottom plate; 209 - air pipe; 300 - punch; 301 - upper die plate; 302 - main outer forming surface; 303 - left bulging surface; 304 - front guide surface; 305 - shunt crotch surface; 400 - die; 401 - air passage; 402 - upper stretching cavity; 403 - main inner forming surface; 404 - lower bulging cavity. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present application will be described in detail below with reference to the drawings, which form a part of this application, and together with the embodiments of the present application, illustrate the principles of the present application.

[0040] The two-pass barrel is mainly used for conveying airflow, in order to reduce the airflow resistance and ensure the air intake efficiency, the wall surface of the two-pass barrel is usually a plane or a curved surface, and there is no corner structure. However, the existing superplastic forming is usually used for forming regular shapes such as planes or barrels, and for structures with too many curved surfaces and no corners (for example, the two-pass barrel), the structure, design and manufacturing of the blank are very complex, which leads to poor feasibility of manufacturing the blank of such structure, and the superplastic forming of such structure is usually not achieved.

[0041] Embodiment One

[0042] The embodiment provides a two-way cylindrical blank, referring to Figures 1 to 2 The left arc plate 201 and the left bending plate 203 enclose one fluid passage of the two-way cylindrical blank 200, the right arc plate 207 and the right bending plate 205 enclose another fluid passage of the two-way cylindrical blank 200, the upper end of the left arc plate 201 and the upper end of the left bending plate 203 are connected with the left head 202, the edge shape of the left head 202 is conformal to the shape enclosed by the upper end of the left arc plate 201 and the upper end of the left bending plate 203, the lower end of the left bending plate 203 is connected with one side of the shunt crotch 204, the upper end of the right arc plate 207 and the upper end of the right bending plate 205 are connected with the right head 206, the edge shape of the right head 206 is conformal to the shape enclosed by the upper end of the right arc plate 207 and the upper end of the right bending plate 205, the lower end of the right bending plate 205 is connected with the other side of the shunt crotch 204, the lower end of the shunt crotch 204 is connected with the side surface of the left arc plate 201 and the right arc plate 207 respectively, and the lower end of the left arc plate 201 and the lower end of the right arc plate 207 are connected with the bottom plate 208, so that the two-way cylindrical blank 200 with internal sealing can be formed.

[0043] Through the analysis of the wall surface structure of the two-way cylindrical body 100, the two-way cylindrical body 100 is simplified and disassembled, the complex curved surface of the two-way cylindrical body 100 is decomposed into the left arc plate 201, the left bending plate 203, the shunt crotch 204, the right bending plate 205 and the right arc plate 207, so that the two-way cylindrical blank 200 has manufacturing feasibility, in addition, through the setting of the bottom plate 208 and the left head 202, the left arc plate 201, the left head 202, the left bending plate 203, the shunt crotch 204, the right bending plate 205, the right head 206, the right arc plate 207 and the bottom plate 208 form the two-way cylindrical blank 200 with internal sealing, so that the superplastic forming of the two-way cylindrical body 100 can be realized.

[0044] In addition, the two-way cylindrical blank 200 with such a structure can generate upward pulling driving force on the shunt crotch 204 area in the forming process, so that the shunt crotch 204 can be attached to the convex die 300.

[0045] The left head 202, the right head 206 and the bottom plate 208 are flat plate parts.

[0046] The cross-sectional shape of the left bending plate 203 is a concave shape, including a first left chamfer plate, a first left flat plate, a second left chamfer plate, a second left flat plate, a third left chamfer plate, a third left flat plate and a fourth left chamfer plate connected in sequence, the first left flat plate is fixedly connected with one side of the left arc plate 201 through the first left chamfer plate, the third left flat plate is fixedly connected with the other side of the left arc plate 201 through the fourth left chamfer plate, so as to enclose one fluid passage of the two-pass barrel blank 200, and the first left chamfer plate, the second left chamfer plate, the third left chamfer plate and the fourth left chamfer plate are all located at chamfered portions.

[0047] The cross-sectional shape of the right bending plate 205 is a concave shape, including a first right chamfer plate, a first right flat plate, a second right chamfer plate, a second right flat plate, a third right chamfer plate, a third right flat plate and a fourth right chamfer plate connected in sequence, the first right flat plate is fixedly connected with one side of the right arc plate 207 through the first right chamfer plate, the third right flat plate is fixedly connected with the other side of the right arc plate 207 through the fourth right chamfer plate, so as to enclose the other fluid passage of the two-pass barrel blank 200, and the first right chamfer plate, the second right chamfer plate, the third right chamfer plate and the fourth right chamfer plate are all located at chamfered portions.

[0048] The shunt crotch 204 includes a first crotch chamfer plate, a first trapezoidal transition flat plate, a second crotch chamfer plate, a first crotch flat plate, a third crotch chamfer plate, a second trapezoidal transition flat plate and a fourth crotch chamfer plate connected in sequence.

[0049] Correspondingly, based on the above structure of the left bending plate 203, the right bending plate 205 and the shunt crotch 204, the connection relationship between each component is as follows:

[0050] The lower end of the first left chamfer plate is connected with one side of the first crotch chamfer plate, the upper end of the first left chamfer plate is connected with the left head 202, the lower end of the first right chamfer plate is connected with the other side of the first crotch chamfer plate, and the upper end of the first right chamfer plate is connected with the right head 206.

[0051] The lower end of the first left flat plate is connected with one side of the first trapezoidal transition flat plate, the upper end of the first left flat plate is connected with the left head 202, the lower end of the first right flat plate is connected with the other side of the first trapezoidal transition flat plate, and the upper end of the first right flat plate is connected with the right head 206.

[0052] The lower end of the second left chamfer plate is connected with one side of the second crotch chamfer plate, the upper end of the second left chamfer plate is connected with the left head 202, the lower end of the second right chamfer plate is connected with the other side of the second crotch chamfer plate, and the upper end of the second right chamfer plate is connected with the right head 206.

[0053] The lower end of the second left flat plate is connected with one side of the first crotch flat plate, the upper end of the second left flat plate is connected with the left head 202, the lower end of the second right flat plate is connected with the other side of the first crotch flat plate, and the upper end of the second right flat plate is connected with the right head 206.

[0054] The lower end of the third left chamfering plate is connected with one side of the third crotch chamfering plate, the upper end of the third left chamfering plate is connected with the left end cover 202, the lower end of the third right chamfering plate is connected with the other side of the third crotch chamfering plate, and the upper end of the third right chamfering plate is connected with the right end cover 206.

[0055] The lower end of the third left flat plate is connected with one side of the second trapezoidal transition flat plate, the upper end of the third left flat plate is connected with the left end cover 202, the lower end of the third right flat plate is connected with the other side of the second trapezoidal transition flat plate, and the upper end of the third right flat plate is connected with the right end cover 206.

[0056] The lower end of the fourth left chamfering plate is connected with one side of the fourth crotch chamfering plate, the upper end of the fourth left chamfering plate is connected with the left end cover 202, the lower end of the fourth right chamfering plate is connected with the other side of the fourth crotch chamfering plate, and the upper end of the fourth right chamfering plate is connected with the right end cover 206.

[0057] The two-way cylindrical blank 200 with the above structure needs to design parts whose material undergoes tensile deformation in the split crotch and the transition fillet area of the two-way cylinder 100 according to the function, structure and forming difficulty of the two-way cylinder 100. Therefore, a trapezoidal transition area is designed at the position of the split crotch 204, and obtuse-angle transition flat plates (for example, the first left chamfering plate, the second left chamfering plate, the third left chamfering plate, the fourth left chamfering plate, the first right chamfering plate, the second right chamfering plate, the third right chamfering plate, the fourth right chamfering plate, the first crotch chamfering plate, the second crotch chamfering plate, the third crotch chamfering plate and the fourth crotch chamfering plate) are designed in the split crotch and the transition fillet area of the two-way cylinder 100, so as to prevent the two-way cylindrical blank 200 from being broken in forming. Because this shape can control the deformation mode to be mainly tensile deformation and the shear deformation is approximately zero.

[0058] In order to improve the adhesion of the split crotch 204 and the punch 300, the split crotch 204 is provided with a baffle, the space in the two-way cylindrical blank 200 is divided into two forming cavities by the baffle, and the two forming cavities are respectively inflated, so as to improve the adhesion of the split crotch 204 and the punch 300, and the smooth transition quality and stability of the split crotch 204 forming.

[0059] Example Two

[0060] The present embodiment provides a superplastic forming method of a two-way cylinder, which is used for the preparation of the two-way cylinder 100, and comprises the following steps: Figure 3 、 Figure 7 and Figure 8

[0061] Step 1: providing a two-way cylindrical blank 200 and a punch 300 and a die 400 matched with each other, referring to Figure 4 ​In the two-way cylindrical blank 200, only the circular arc surface arranged along the fluid pipeline axis is made of curved panel, and other positions are made of flat panel;

[0062] Step 2: Place the two-way cylindrical blank 200 in the concave die 400, and mount the convex die 300 on the concave die 400 and the two-way cylindrical blank 200, and press the dies tightly;

[0063] Step 3: Heat the two-way cylindrical blank 200, the convex die 300 and the concave die 400, so that the two-way cylindrical blank 200 softens;

[0064] Step 4: Fill the two-way cylindrical blank 200 with gas (for example, inert gas), and the two-way cylindrical blank 200 is gradually fitted onto the convex die 300 and the concave die 400 under the action of gas pressure, and the superplastic forming of the two-way cylindrical body 100 is completed, and the two-way cylindrical body 100 is obtained.

[0065] Compared with the prior art, the superplastic forming method of the two-way cylindrical body provided in the embodiment can manufacture the structure of the two-way cylindrical body 100 with integrity and light weight. Unlike the manufacturing process of the existing superplastic process and the manufacturing process of the segmented forming and welding assembly of the traditional process, the method has the characteristics of rapidity, low precision requirement of the blank, low assembly cost, etc., can effectively shorten the quality control period and process, reduce the number and time consumption of the part manufacturing process, reduce the cost investment of part manufacturing and component assembly, stabilize the quality index of the two-way cylindrical body 100 structure, and is suitable for meeting the efficient, intelligent and automatic demand.

[0066] It should be noted that before the convex die 300 and the concave die 400 are pressed tightly, the two-way cylindrical blank 200 is not pressurized and filled with gas, so that the deformation of the two-way cylindrical blank 200 caused by gas pressure can be prevented.

[0067] Specifically, for the TA15 panel, the heating temperature of the above-mentioned step 3 is 850-950°C.

[0068] The above-mentioned step 4 includes the following steps:

[0069] Step 41: Fill the two-way cylindrical blank 200 with gas at a pressure of 0.4-0.6 MPa, and keep the pressure for 8-12 min to form the circular arc surface arranged along the fluid pipeline axis;

[0070] Step 42: Increase the gas pressure to 1.8-2.3 MPa, and keep the pressure for 18-20 min to stretch the left head 202 and the right head 206 to the upper and lower directions, respectively, and drive the left arc plate 201, the left bending plate 203, the right bending plate 205 and the right arc plate 207 to stretch, respectively;

[0071] Step 43: increase the inflation pressure to 2.8-3.2 MPa, and keep the pressure for 8-10 minutes, so that each corner of the two-way cylindrical blank 200 is completely attached to the male die 300 and the female die 400, and the superplastic forming of the two-way cylindrical body 100 is completed, and the two-way cylindrical body 100 is obtained.

[0072] For the aluminum alloy sheet, the heating temperature in step 3 is 350-550 °C.

[0073] Step 4 includes the following steps:

[0074] Step 41: inflate the two-way cylindrical blank 200 with an inflation pressure of 1.0-1.2 MPa, and keep the pressure for 10-15 minutes to shape the circular arc surface arranged axially on the fluid pipe;

[0075] Step 42: increase the inflation pressure to 3.0-3.5 MPa, and keep the pressure for 18-20 minutes to stretch the left head 202 and the right head 206, and the left arc plate 201, the left bending plate 203, the right bending plate 205, and the right arc plate 207 are stretched upward and downward, respectively;

[0076] Step 43: increase the inflation pressure to 5.5-6.0 MPa, and keep the pressure for 15-20 minutes, so that each corner of the two-way cylindrical blank 200 is completely attached to the male die 300 and the female die 400, and the superplastic forming of the two-way cylindrical body 100 is completed, and the two-way cylindrical body 100 is obtained.

[0077] In order to avoid the oxidation of the two-way cylindrical body 100 after the superplastic forming, the following steps are included after step 43:

[0078] Step 44: continue to keep the pressure for 20-30 minutes, and then deflate the two-way cylindrical body 100 to reduce the gas supply pressure to 0.004-0.006 MPa, and continue to supply gas to ensure the purity of the gas in the two-way cylindrical body 100.

[0079] It should be noted that after the superplastic forming of the two-way cylindrical body 100 is completed, a step of removing excess material is included, which specifically includes the following steps:

[0080] The left head 202, the right head 206, and the upper and lower ends of the bottom plate 208 are cut to remove excess material, and the upper and lower ventilation of the two-way cylindrical body 100 is realized.

[0081] For the manufacture of the two-way cylindrical blank 200, the following steps are included before step 1:

[0082] Step A: manufacture the left arc plate 201, the left head 202, the left bending plate 203, the split crotch 204, the right bending plate 205, the right head 206, the right arc plate 207, and the bottom plate 208, respectively.

[0083] Step B: sealing butt welding (for example, electron beam welding, laser welding, brazing or argon arc welding) is performed on the left arc plate 201, the left head plate 202, the left bending plate 203, the shunt crotch 204, the right bending plate 205, the right head plate 206, the right arc plate 207 and the bottom plate 208, to obtain the two-way cylindrical blank 200.

[0084] In order to improve the part allowance value, the upper end of the left arc plate 201, the right arc plate 207, the left bending plate 203 and the right bending plate 205 is 0-10mm higher than the theoretical edge of the two-way cylindrical body 100, and the lower end of the left arc plate 201 and the right arc plate 207 is 0-10mm lower than the theoretical edge of the two-way cylindrical body 100. On the one hand, it can cope with the subsequent functional extension of the part and leave enough optimization allowance, and on the other hand, it can optimize the base number of up and down stretching, increase the circumferential deformation, help to improve the forming precision of the round corner transition area of the shunt crotch 204, increase the circumference, improve the smooth trend of the material in the air pressure deformation, reduce the risk of shear force, and improve the safety and stability of the SPF.

[0085] For the structure of the punch 300, see Figure 5 , specifically, it includes an upper die plate 301 and a core die provided on the upper die plate 301, and the outer shape surface of the core die is divided into a core die reserved shape surface, a main outer forming surface 302 and a shunt crotch shape surface 305 along the direction gradually away from the upper die plate 301. The core die reserved shape surface is divided into a left bulging surface 303, a front guide surface 304, a right bulging surface and a rear guide surface, which are sequentially connected to form a closed annular shape surface. Among them, the left bulging surface 303 and the right bulging surface belong to the upward stretching part, which closes the upper stretching cavity of the concave die 400 to form an upper deformation stretching area, which can provide driving force for lifting the two-way cylindrical blank 200 upward, and can also provide operating space for the circumferential stretching of the round corner transition area during the final fitting of the mold.

[0086] In order to further improve the fitting of the shunt crotch 204 and the punch 300, the above-mentioned core die shunt crotch is designed to be consistent with the design model position of the two-way cylindrical body 100, and the height thereof should be in contact with the upper surface of the shunt crotch 204 of the two-way cylindrical blank 200 without being pressed tightly.

[0087] It should be noted that during the closing process of the punch 300 and the concave die 400, the gap between the front guide surface 304 and the rear guide surface and the concave die 400 is not more than 0.02mm, because the front guide surface 304 and the rear guide surface are in the last closing stroke after the punch 300 and the concave die 400 are aligned, and they have a guiding effect, which facilitates the matching and accurate butt joint of the punch 300 and the concave die 400.

[0088] In order to facilitate subsequent removal of the allowance, the height of the core die reserved shape surface is 50-100mm.

[0089] For the structure of the concave die 400, see Figure 6 Specifically, the inner surface thereof is divided into an upper stretching cavity 402, a main inner surface 403 and a lower bulging cavity 404 arranged in sequence, wherein the upper stretching cavity 402 corresponds to the position of the core die reserved surface, and the main inner surface 403 corresponds to the position of the main outer forming surface 302.

[0090] It can be understood that, in order to be able to place the ventilation pipe 209, the ventilation groove 401 needs to be opened on the above-mentioned concave die 400, and the ventilation pipe 209 is in communication with the two-way cylindrical blank 200 after passing through the ventilation groove 401, thereby realizing inflation.

[0091] In order to ensure smooth inflation and deflation, the above-mentioned ventilation groove 401 is opened on the core die reserved surface, and the distance from the upper end of the core die reserved surface is 8-12 mm. Exemplarily, the cross-sectional shape of the ventilation groove 401 can be rectangular or circular, so as to ensure that the ventilation pipe 209 is not flattened in the ventilation groove 401, and the inflation and deflation are smooth.

[0092] It should be noted that, in order to enable the two-way cylindrical blank 200 to be smoothly loaded or unloaded into or out of the male die 300 and the concave die 400, the profile cross section of the male die 300 and the concave die 400 is of a structure with a large mouth and a small bottom.

[0093] However, from the perspective of the degree of fit, the cross-sectional area of the lower bulging cavity 404 is greater than that of the main inner surface 403, that is, the inner surface of the concave die 400 has a widened area. In this way, during the inflation process, the deformation of the blank at the position of the lower bulging cavity 404 is increased, which can further stretch the deformation of the blank at the position of the main inner surface 403, improve the fit between the main inner surface 403 and the blank, and because the lower bulging cavity 404 is a widened area, the blank cannot be directly loaded or unloaded into or out of the male die 300 and the concave die 400, therefore, the concave die 400 needs to be split type.

[0094] Exemplarily, the height of the lower bulging cavity 404 is 100-200 mm, which leaves sufficient optimization margin for subsequent functional extension parts, and can also increase the circumferential deformation amount of the lower cavity, which is helpful to improve the forming precision of the split crotch round corner transition area. The principle is that the circumference is increased, the smooth trend of the material under the action of air pressure is improved, the risk of shear force is reduced, and the safety and stability of the SPF are improved.

[0095] For the coordinated assembly between the two-way cylindrical blank 200 and the male die 300 and the concave die 400, that is, step 2 includes the following steps:

[0096] Step 21: align the male die 300 into the concave die 400, and place it into a hot forming press, the male die 300 is fixed on the upper platform, and the concave die 400 is fixed on the lower platform;

[0097] Step 22: control the upper platform of the hot forming press to move upward, open the mold, and expose the outer shape surface of the male die 300 and the inner shape surface of the female die 400;

[0098] Step 23: point positioning of the left end cover 202, the left bending plate 203, the shunt crotch, the right bending plate 205, the right end cover 206 and the right arc plate 207 is performed, and the parts are placed into the female die 400; according to the distance between the shunt crotch surface 305 of the male die 300 and the inner bottom surface of the female die 400, the size of the blank is adjusted, the height of the parts can be reduced by grinding, or the height can be increased by padding the inner bottom surface with a material or a block; according to the position of the vent groove 401, the height is increased by 5 mm, and the pipeline interface positioning point is marked at the installation position of the vent pipe 209; according to the lower edge ridge line of the upper stretching cavity 402, the height of the upper end of the blank is adjusted to be higher than the line, or the height can be increased by padding the inner bottom surface with a material or a block;

[0099] Step 24: the vent hole is drilled at the pipeline interface positioning point, the vent pipe 209 is installed and completely welded.

[0100] Step 25: the butt joint of each part (for example, the left arc plate 201, the left bending plate 203, the shunt crotch, the right bending plate 205 and the right arc plate 207) is completely welded, and a protective atmosphere is used to protect the metal material performance of the weld joint, for example, carbon steel is protected by carbon dioxide or nitrogen, aluminum alloy, titanium alloy and stainless steel are protected by argon.

[0101] Step 26: the left end cover 202, the right end cover 206 and the bottom plate 208 at the upper and lower ends are positioned and welded, and ventilation protection is performed in the process; through the above blank preparation process, two internal and external interconnected sealed cavities are formed, after welding, the method for replacing the gas in the cylinder is as follows: the blank is placed horizontally, one of the two vent pipes 209 faces upward and the other faces downward, argon gas is connected to the lower vent pipe 209, the gas is slowly replaced, the cylinder is slowly filled, the air is slowly discharged from the upward vent pipe 209 according to the different densities, and the detection method can be that a match is ignited and then approached to the upper end pipeline, if the flame is extinguished, the upper end pipeline has been discharged of air. The pipeline is closed and placed into the female die 400.

[0102] Step 27: the upper platform of the hot forming press is lowered, the parting surface of the male die 300 and the female die 400 is tightly closed, and the mold is tightly closed as a whole.

[0103] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any change or replacement within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application.

Claims

1. A two-way cylindrical blank, characterized in that, The left arc plate, the left head, the left bending plate, the shunt crotch, the right bending plate, the right head, the right arc plate and the bottom plate are arranged in sequence. The left arc plate and the left bending plate enclose one fluid passage of the two-pass barrel blank, and the right arc plate and the right bending plate enclose the other fluid passage of the two-pass barrel blank. The upper end of the left arc plate and the upper end of the left bending plate are connected with the left head, the lower end of the left bending plate is connected with one side of the shunt crotch, the upper end of the right arc plate and the upper end of the right bending plate are connected with the right head, the lower end of the right bending plate is connected with the other side of the shunt crotch, the lower end of the shunt crotch is connected with the side surface of the left arc plate and the right arc plate respectively, and the lower end of the left arc plate and the lower end of the right arc plate are connected with the bottom plate, thereby forming the two-pass barrel blank with an internal closed space.

2. The two-port cylindrical body blank of claim 1, wherein, The left head, the right head and the bottom plate are flat plate parts.

3. The two-port cylindrical body blank of claim 1, wherein, The cross-sectional shape of the left bending plate is a concave shape, and the left bending plate comprises, in sequence, a first left chamfer plate, a first left flat plate, a second left chamfer plate, a second left flat plate, a third left chamfer plate, a third left flat plate and a fourth left chamfer plate, the first left flat plate is fixedly connected with one side of the left arc plate through the first left chamfer plate, the third left flat plate is fixedly connected with the other side of the left arc plate through the fourth left chamfer plate, thereby enclosing one fluid passage of the two-pass barrel blank, and the first left chamfer plate, the second left chamfer plate, the third left chamfer plate and the fourth left chamfer plate are located at chamfered portions.

4. The two-port cylindrical body blank of claim 3, wherein, The cross-sectional shape of the right bending plate is a concave shape, and the right bending plate comprises, in sequence, a first right chamfer plate, a first right flat plate, a second right chamfer plate, a second right flat plate, a third right chamfer plate, a third right flat plate and a fourth right chamfer plate, the first right flat plate is fixedly connected with one side of the right arc plate through the first right chamfer plate, the third right flat plate is fixedly connected with the other side of the right arc plate through the fourth right chamfer plate, thereby enclosing the other fluid passage of the two-pass barrel blank, and the first right chamfer plate, the second right chamfer plate, the third right chamfer plate and the fourth right chamfer plate are located at chamfered portions.

5. The two-port cylindrical body blank of claim 4, wherein, The shunt crotch comprises, in sequence, a first crotch chamfer plate, a first trapezoidal transition flat plate, a second crotch chamfer plate, a first crotch flat plate, a third crotch chamfer plate, a second trapezoidal transition flat plate and a fourth crotch chamfer plate.

6. The two-port cylindrical body blank of claim 5, wherein, The lower end of the first left chamfer plate is connected with one side of the first crotch chamfer plate, the upper end of the first left chamfer plate is connected with the left head, the lower end of the first right chamfer plate is connected with the other side of the first crotch chamfer plate, and the upper end of the first right chamfer plate is connected with the right head.

7. The two-pass cylindrical shell blank of any one of claims 1 to 6, wherein, A baffle is arranged on the shunt crotch, and the space in the two-pass barrel blank is divided into two forming cavities by the baffle.

8. The two-pass cylindrical shell blank of any one of claims 1 to 6, wherein, The edge shape of the left head is conformal to the shape enclosed by the upper end of the left arc plate and the upper end of the left bending plate.

9. The two-pass cylindrical shell blank of any one of claims 1 to 6, wherein, The edge shape of the right head is conformal to the shape enclosed by the upper end of the right arc plate and the upper end of the right bending plate.

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