Mold and method for integrally extruding a profiled member

Abstract

The whole extrusion forming die of the ribbed component and the forming method based on the die provided by the application relate to the field of plastic working, and comprise an extrusion cylinder, an upper die and a lower die. The upper die comprises a flow guide body and a mandrel, one end of the flow guide body is fixedly connected with one end of the mandrel, the upper die is provided with a plurality of first flow guide channels and at least one second flow guide channel extending along the length direction of the upper die, the outer wall of the mandrel is provided with rib forming grooves extending along the length direction of the upper die, each first flow guide channel can penetrate through the flow guide body, the outlet of each first flow guide channel is located on the outer side of the mandrel, and each rib forming groove is communicated with one second flow guide channel. The mandrel can be inserted into the through hole, a component forming cavity is formed between part of the outer wall of the mandrel and part of the inner wall of the lower die, each first flow guide channel is communicated with the component forming cavity, and each rib forming groove is communicated with the component forming cavity. The forming effect is good, and the die has the advantages of high efficiency, energy saving, light weight and low cost.

Description

Technical Field

[0001] This invention relates to the field of metal plastic processing technology, and in particular to a mold and method for integral extrusion molding of ribbed components. Background Technology

[0002] Ribbed thin-walled components are widely used in high-precision fields such as aerospace. For example, the structural sections of rocket bodies are made of ribbed thin-walled components. With the continuous development of aerospace technology, the quality requirements for ribbed thin-walled components are becoming increasingly stringent. For instance, the diameter span of the body of a new generation of launch vehicles is 5m-10m, which not only places new demands on the shape and dimensions of the sections (wall panel width exceeds 1300mm, width / wall thickness ≈ 867, rib height / wall thickness ≈ 29), but also imposes more stringent requirements on their performance. Therefore, the development of high-performance, low-cost, and efficient technologies for manufacturing integral ribbed thin-walled components is urgently needed. Ribbed thin-walled components are generally classified according to their overall structure, cross-sectional shape, and rib layout. Among them, according to the overall structure, they are divided into wall panel components and cylinder / ring components; according to the cross-sectional shape, they are divided into I-shaped ribs, T-shaped ribs, and Γ-shaped ribs, etc.; according to the rib layout, they are divided into unidirectional ribs (transverse / circular ribs or longitudinal ribs) and mesh cross ribs, etc.

[0003] Currently, there are two methods for forming the stiffened wall panels of rocket bodies: thin-plate stiffener riveting and thick-plate milling. Among these, thin-plate stiffener riveting is the most common method for producing stiffened thin-walled components. Figure 1 As shown, this forming method requires the separate processing of stringers and thin-walled components. During assembly, specific tooling is needed to fix the stringers, and then a skin is wrapped around the outside or inside of the stringers. Subsequently, rivets are made sequentially at specific locations to obtain stiffened components, such as stiffened cabins. While riveting is a simple process, it requires extensive work on parts assembly design by engineers, and the cost of specialized tooling is high. Secondly, riveting is done manually, and the quality is highly dependent on the worker's skill level and proficiency, making it difficult to guarantee consistent quality and prone to defects such as rivet head misalignment, rivet shank misalignment, and gaps at the joint surface. Furthermore, the large number of rivets significantly increases the assembly cycle and difficulty of the shell section (riveting accounts for approximately 60%–80% of the shell section production cycle). With the increase in rocket body diameter, the number of rivets increases dramatically, severely restricting the lightweight, efficient, and low-cost manufacturing of launch vehicles.

[0004] like Figure 2As shown, manufacturing integral ribbed thin-walled components through thick plate milling is another major method for manufacturing integral large-diameter ribbed thin-walled components. Specifically, after blanking, a ribbed straight-walled plate can be machined first, and then rolled or bent to obtain a ribbed curved plate; alternatively, a curved plate can be rolled or bent first, and then machined to obtain a ribbed curved plate. Subsequently, multiple ribbed curved plates are welded and assembled to obtain the final rocket body. However, this manufacturing method not only has disadvantages such as large machining volume, low material utilization rate (less than 30%), and high manufacturing cost, but also generates large stress during processing, resulting in many problems such as difficulty in ensuring forming accuracy and damage to rheological structure. It is difficult to achieve efficient and rapid manufacturing and cannot meet the development needs of the next generation of launch vehicles. Summary of the Invention

[0005] The purpose of this invention is to provide a mold and method for integral extrusion molding of ribbed components, so as to solve the problems existing in the prior art. It has the advantages of high efficiency, greenness and energy saving, and reduces costs and weight of ribbed components; it also has a better molding effect.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a die for integral extrusion molding of ribbed components, comprising an extrusion cylinder, an upper die, and a lower die, wherein:

[0008] The upper mold includes a flow guide body and a mandrel. One end of the flow guide body is fixedly connected to one end of the mandrel. The upper mold is provided with a first flow guide channel and a second flow guide channel extending along the length direction of the upper mold. There are multiple first flow guide channels and at least one second flow guide channel. The outer wall of the mandrel is provided with a rib forming groove extending along the length direction of the upper mold. Each first flow guide channel can penetrate the flow guide body. The outlet of each first flow guide channel is located on the outside of the mandrel. Each rib forming groove is connected to one of the second flow guide channels.

[0009] One end opening of the extrusion cylinder is connected to each of the first flow channels and each of the second flow channels, and the other end opening of the extrusion cylinder allows the metal billet to enter the inner cavity of the extrusion cylinder;

[0010] The lower mold has a through hole that penetrates the lower mold along the center line direction. The end of the flow guide body away from the extrusion cylinder is sealed to one end of the lower mold. The mandrel can extend into the through hole. A component forming cavity is formed between a portion of the outer wall of the mandrel and a portion of the inner wall of the lower mold. Each of the first flow guide channels communicates with the component forming cavity.

[0011] Preferably, a flow guide component is further included, which is arranged between the upper die and the extrusion cylinder, and two ends of the flow guide component are sealingly connected with the upper die and the extrusion cylinder respectively, the flow guide component has a plurality of third flow guide channels and at least one fourth flow guide channel, each first flow guide channel communicates with at least one third flow guide channel, and each second flow guide channel communicates with at least one fourth flow guide channel.

[0012] Preferably, the upper die further includes at least one baffle, the baffle is fixedly connected with the mandrel, at least one baffle is arranged at the entrance of each rib forming groove, and the baffle can shield part of the entrance of the corresponding rib forming groove or enclose at least part of the entrance of the corresponding rib forming groove.

[0013] Preferably, the flow area of the first flow guide channel is greater than the flow area of the second flow guide channel, and the flow area of the third flow guide channel is greater than the flow area of the fourth flow guide channel.

[0014] Preferably, at least one of the first flow guide channel, the second flow guide channel, the third flow guide channel and the fourth flow guide channel is inclined away from a straight line where the center line of the upper die is located.

[0015] Preferably, the lower die is sequentially provided with a first welding chamber, a second welding chamber and a forming hole with decreasing inner diameters from one end close to the upper die to the other end of the lower die, and the first welding chamber, the second welding chamber and the forming hole sequentially communicate and form the through hole, the first welding chamber communicates with each first flow guide channel, one end of the mandrel away from the flow guide body has a component forming outer wall, the component forming cavity is formed between the inner wall of the forming hole and the component forming outer wall, and the forming hole communicates with a plurality of rib forming grooves.

[0016] The application also provides a ribbed component extrusion forming method based on the ribbed component overall extrusion forming die, which comprises the following steps:

[0017] S1, obtaining a metal blank and heating the metal blank to a specific temperature, and placing the metal blank in the inner cavity of the extrusion cylinder;

[0018] S2, extruding the metal blank along the center line direction of the extrusion cylinder and towards the upper die, so that the metal blank enters the component forming cavity along the first flow guide channel and enters the rib forming groove along the second flow guide channel, to form an initial forming piece.

[0019] S3, taking out the initial forming piece, performing excess material cutting on the initial forming piece, and obtaining a first ribbed cylinder-shaped component.

[0020] Preferably, S4, the first ribbed cylinder-shaped member is cut and flattened to form a ribbed wall plate.

[0021] Preferably, S5, the ribbed wall plate is processed into an arc wall plate, and a plurality of arc wall plates with the same diameter are sequentially fixed and connected to form a second ribbed cylinder-shaped member.

[0022] Preferably, S3 includes: taking out the initial forming piece, and cutting off excess material from the initial forming piece to obtain the first ribbed cylinder-shaped member with a diameter d and a length l.

[0023] S5 includes: processing the ribbed wall plate into the arc wall plate with a diameter D and a length h, h<=l, and sequentially fixing and connecting D / d arc wall plates with the diameter D and the length h to form the second ribbed cylinder-shaped member.

[0024] The present application has the following technical effects relative to the prior art:

[0025] The ribbed member overall extrusion forming die and forming method provided by the present application, comprising an extrusion cylinder, an upper die and a lower die, the upper die comprises a flow guide body and a mandrel, one end of the flow guide body is fixedly connected with one end of the mandrel, the upper die is provided with a first flow guide channel and a second flow guide channel extending along the length direction of the upper die, the first flow guide channel is a plurality of, and the second flow guide channel is at least one, the outer wall of the mandrel is provided with a rib forming groove extending along the length direction of the upper die, each first flow guide channel can penetrate through the flow guide body, the outlet of each first flow guide channel is located on the outer side of the mandrel, and each rib forming groove is communicated with one second flow guide channel; the mandrel can extend into the through hole, and a member forming cavity is formed between part of the outer wall of the mandrel and part of the inner wall of the lower die, each first flow guide channel is communicated with the member forming cavity, and each rib forming groove is communicated with the member forming cavity.

[0026] By placing the metal blank in the extrusion cylinder, the metal blank is extruded into the first flow channel and the second channel by the extrusion component such as punch along the direction of the center line of the extrusion cylinder, and enters the component forming cavity through the first flow channel and enters the rib forming groove through the second flow channel, the component forming cavity is used for forming the component body, and the rib forming groove is used for forming the rib, the component forming cavity and the rib forming groove jointly form a working belt, and after forming, demolding is carried out, so that the extrusion integrally formed component body and rib are obtained, and during the extrusion forming process, the extrusion deformation strain of the material is large, so that the grain is refined, and then the reinforcement of the ribbed component is realized; and compared with riveting forming, complex part assembly design work is not needed, and a large number of rivets are saved, the work efficiency is improved, the cost is reduced, and the weight of the ribbed component is reduced; compared with the mechanical removal method, the problems of large mechanical machining amount, high manufacturing cost, poor forming precision, and damaged rheological organization can be overcome, near net forming is basically realized, and the advantages of high efficiency, green, energy saving and the like are achieved. At the same time, the blank is extruded and divided through the plurality of first flow channels and second flow channels and enters the mold forming cavity, which is beneficial to improve the uniformity of feeding and thus improve the forming effect. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Figure 1 Flowchart of the thin plate rib riveting forming process in the background art;

[0029] Figure 2 Flowchart of the thick plate milling process in the background art;

[0030] Figure 3 Flowchart of the ribbed component extrusion forming method provided in embodiment 2;

[0031] Figure 4 Cross-sectional view of the ribbed component integral extrusion forming die provided in embodiment 1;

[0032] Figure 5 Structure schematic view of the ribbed component integral extrusion forming die provided in embodiment 1;

[0033] Figure 6 Structure schematic view of the flow guide component provided in embodiment 1;

[0034] Figure 7 Structure schematic view of the upper die provided in embodiment 1;

[0035] Figure 8 The bottom view of the upper mold provided for Example 1 (the view is taken from the position shown in the figure, and the view is taken from the bottom); Figure 7

[0036] Figure 9 The enlarged view of the middle B; Figure 8

[0037] Figure 10 The cross-sectional view of the middle A-A; Figure 8

[0038] Figure 11 The structural schematic diagram of the lower mold provided for Example 1;

[0039] Figure 12 The structural schematic diagram of the first ribbed cylindrical member provided for Example 1;

[0040] Figure 13 The structural schematic diagram of the ribbed wall plate provided for Example 1;

[0041] Figure 14 The structural schematic diagram of the second ribbed cylindrical member provided for Example 1 (the rib is on the inner wall of the member body);

[0042] Figure 15 The structural schematic diagram of the flow guide member provided for Example 1 (the rib is on the outer wall of the member body);

[0043] In the figure: 100, the overall extrusion forming mold of the ribbed member; 1, the extrusion cylinder; 2, the upper mold; 201, the flow guide body; 202, the mandrel; 203, the first flow guide channel; 204, the second flow guide channel; 205, the rib forming groove; 206, the baffle; 207, the member forming outer wall; 3, the lower mold; 301, the first welding chamber; 302, the second welding chamber; 303, the forming hole; 4, the member forming cavity; 5, the flow guide member; 501, the third flow guide channel; 502, the fourth flow guide channel; 6, the metal blank; 7, the punch plate; 8, the first ribbed cylindrical member; 9, the ribbed wall plate; 10, the second ribbed cylindrical member. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0045] ​​​The purpose of this invention is to provide a mold and method for integral extrusion molding of ribbed components, so as to solve the problems existing in the prior art. It has the advantages of high efficiency, greenness and energy saving, and reduces costs and weight of ribbed components; it also has a better molding effect.

[0046] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Example 1

[0048] like Figures 3-15 As shown, this embodiment provides a die 100 for integral extrusion molding of ribbed components, including an extrusion cylinder 1, an upper die 2, and a lower die 3, wherein:

[0049] The upper mold 2 includes a flow guide body 201 and a mandrel 202. One end of the flow guide body 201 is fixedly connected to one end of the mandrel 202. The upper mold 2 is provided with a first flow guide channel 203 and a second flow guide channel 204 extending along the length direction of the upper mold 2. There are multiple first flow guide channels 203 and at least one second flow guide channel 204. The outer wall of the mandrel 202 is provided with a rib forming groove 205 extending along the length direction of the upper mold 2. Each first flow guide channel 203 can penetrate the flow guide body 201. The outlet of each first flow guide channel 203 is located on the outside of the mandrel 202. Each rib forming groove 205 is connected to a second flow guide channel 204.

[0050] One end of the extrusion cylinder 1 is connected to each of the first flow channels 203 and each of the second flow channels 204, and the other end of the extrusion cylinder 1 is open to allow the metal billet 6 to enter the inner cavity of the extrusion cylinder 1.

[0051] The lower mold 3 has a through hole that runs through the lower mold 3 along the center line direction. The end of the flow guide body 201 away from the extrusion cylinder 1 is sealed and connected to one end of the lower mold 3. The mandrel 202 can extend into the through hole. A component forming cavity 4 is formed between a part of the outer wall of the mandrel 202 and a part of the inner wall of the lower mold 3. Each first flow guide channel 203 is connected to the component forming cavity 4, and each rib forming groove 205 is connected to the component forming cavity 4.

[0052] By placing the metal billet 6 inside the extrusion cylinder 1, and using extrusion components such as punches to extrude the metal billet 6 along the centerline of the extrusion cylinder 1, the metal billet 6 is forced into the first guide channel 203 and the second channel. It then enters the component forming cavity 4 through the first guide channel 203 and the rib forming groove 205 through the second guide channel 204. The component forming cavity 4 is used to form the component body, and the rib forming groove 205 is used to form the ribs. The component forming cavity 4 and the rib forming groove 205 together form the working zone. After forming is completed, demolding is performed to obtain the extruded component. In the extrusion molding process, the material undergoes significant extrusion deformation strain, resulting in grain refinement and strengthening of the ribbed component. Compared to riveting, it eliminates the need for complex part assembly design and reduces the number of rivets, thus improving efficiency, lowering costs, and reducing the weight of the ribbed component. Compared to mechanical removal methods, it overcomes the problems of high machining volume, high manufacturing costs, poor forming accuracy, and damage to rheological structure associated with machining, achieving near-net-shape forming with advantages such as high efficiency, environmental friendliness, and energy saving. Simultaneously, the billet is extruded and diverted through multiple first and second flow channels 203 before entering the mold forming cavity, improving feed uniformity and thus enhancing the forming effect. The working band maintains the desired outer contour shape of the component, and its shape and length can be determined based on the component's wall thickness and rib distribution requirements.

[0053] In a preferred embodiment, the guide body 201, mandrel 202, and extrusion cylinder 1 are all cylindrical and coaxially arranged. The second guide channel 204 extends from the end face of the guide body 201 near the extrusion cylinder 1 to the end of the mandrel 202 near the extrusion cylinder 1 and connects with the rib forming groove 205. The diameter of the guide body 201 is larger than the diameter of the mandrel 202. The portion of the end face of the guide body 201 that contacts the mandrel 202 is a circular surface, and the portion of the end face of the guide body 201 other than the circular surface is an annular surface. The outlet of each first guide channel 203 is located on this annular surface. Each rib forming groove 205 extends from the outer wall of the mandrel 202 towards the centerline of the mandrel 202. The shape and size of the rib forming groove 205 can be set according to production requirements.

[0054] Furthermore, the integral extrusion molding die 100 for ribbed components provided in this embodiment also includes a flow guiding component 5. The flow guiding component 5 is disposed between the upper die 2 and the extrusion cylinder 1, and both ends of the flow guiding component 5 are respectively sealed and connected to the upper die 2 and the extrusion cylinder 1. The flow guiding component 5 has multiple third flow guiding channels 501 and at least one fourth flow guiding channel 502. Each first flow guiding channel 203 communicates with at least one third flow guiding channel 501, and each second flow guiding channel 204 communicates with at least one fourth flow guiding channel 502. As a preferred embodiment, the flow guiding component 5 is coaxially arranged with the flow guiding body 201, and the flow guiding component 5 is fixedly connected to both the upper die 2 and the extrusion cylinder 1. The billet is first extruded into the third flow guiding channel 501 and the fourth flow guiding channel 502, and then enters the first flow guiding channel 203 through the third flow guiding channel 501 and the second flow guiding channel 204 through the fourth flow guiding channel 502, which further improves the uniformity of material distribution, thereby improving the molding effect.

[0055] In a preferred embodiment, the number of first guide channels 203 and third guide channels 501 are the same and they correspond one-to-one, and the number of second guide channels 204 and fourth guide channels 502 are the same and they correspond one-to-one. The first guide channels 203 and third guide channels 501 are both oblong holes with an arc, while the second guide channels 204 and fourth guide channels 502 are both triangular holes. A flow divider bridge is formed between adjacent first guide channels 203 and adjacent third guide channels 501, and the flow divider bridge has a rectangular cross-section.

[0056] Furthermore, the upper mold 2 also includes at least one baffle 206, which is fixedly connected to the mandrel 202. At least one baffle 206 is provided at the entrance of each rib forming groove 205. The baffle 206 can block part of the entrance to the corresponding rib forming groove 205 or enclose at least part of the entrance to the corresponding rib forming groove 205. Since the volume of the component body is generally much larger than the volume of the rib, less material is needed to form the rib. Therefore, the baffle 206 is provided to reduce the flow rate of material entering the rib forming groove 205, so that the forming speed of the component body and the rib is not significantly different, thus ensuring the forming effect.

[0057] In a preferred embodiment, the baffle 206 is fixedly connected inside the second flow channel 204. The baffle 206 is arranged parallel to the bottom wall of the second flow channel 204. The baffle 206 extends at least partially to the entrance of the corresponding rib forming groove 205, thereby reducing the flow area of ​​the flow channel from the second flow channel 204 to the rib forming groove 205.

[0058] In another preferred embodiment, one side of the baffle 206 is fixedly connected to the bottom wall of the second guide channel 204, and the other side of the baffle 206 extends away from the end of the rib forming groove 205. More preferably, the baffle 206 extends axially along the upper mold 2, with a height of 4mm to 6mm and a width of 3mm to 5mm along the axial direction of the upper mold 2. The baffle 206 can prevent the billet on its periphery from flowing into the rib forming groove 205, thereby reducing the flow rate of the material entering the rib forming groove 205.

[0059] Furthermore, the flow area of ​​the first guide channel 203 is greater than that of the second guide channel 204, and the flow area of ​​the third guide channel 501 is greater than that of the fourth guide channel 502, so that more material enters the component forming cavity 4, further balancing the forming speed of the component body and the ribs, matching the forming speed of the two to ensure the forming effect.

[0060] In a preferred embodiment, when forming the longitudinally ribbed thin-walled rocket body, the flow area of ​​the first flow channel 203 is 2 to 2.5 times the flow area of ​​the second flow channel 204, and the flow area of ​​the third flow channel 501 is 2 to 2.5 times the flow area of ​​the fourth flow channel 502. It should be noted that the ratio of the flow area of ​​the first flow channel 203 to the flow area of ​​the second flow channel 204, and the ratio of the flow area of ​​the third flow channel 501 to the flow area of ​​the fourth flow channel 502, can be adjusted according to the dimensions of the component body and the ribs.

[0061] Furthermore, at least one of the first guide channel 203, the second guide channel 204, the third guide channel 501, and the fourth guide channel 502 is inclined from the side near the extrusion cylinder 1 towards the direction away from the center line of the upper die 2. This can reduce the extrusion pressure required for profile extrusion, lower production costs, and improve production efficiency. In a preferred embodiment, the first guide channel 203, the second guide channel 204, the third guide channel 501, and the fourth guide channel 502 are all inclined from the side near the extrusion cylinder 1 towards the direction away from the center line of the upper die 2.

[0062] Furthermore, the lower mold 3 is provided with a first welding chamber 301, a second welding chamber 302 and a forming hole 303 with decreasing inner diameters from one end near the upper mold 2 to the other end of the lower mold 3. The first welding chamber 301, the second welding chamber 302 and the forming hole 303 are connected in sequence to form a through hole. The first welding chamber 301 is connected to each of the first guide channels 203. The end of the mandrel 202 away from the guide body 201 has a component forming outer wall 207. A component forming cavity 4 is formed between the inner wall of the forming hole 303 and the component forming outer wall 207 of the mandrel 202. The forming hole 303 is connected to multiple rib forming grooves 205. The first welding chamber 301 and the second welding chamber 302 form an annular secondary welding chamber, which can concentrate the metal flow and increase the metal flow velocity entering the component forming cavity 4. This balances the metal flow velocity entering the component forming cavity 4 and the rib forming groove 205, ensuring that the forming speed of the component body and the rib is as similar as possible, thereby reducing the deformation of the ribbed component and lowering the probability of instability such as deformation, warping, and dents in the profile. In a preferred embodiment, the first welding chamber 301, the second welding chamber 302, and the forming hole 303 are all circular holes. The end of the mandrel 202 away from the guide body 201 has an annular protrusion, and the outer wall of the annular protrusion is the component forming outer wall 207.

[0063] In a preferred embodiment, the height of the second welding chamber 302 does not exceed 1 / 2 of the height of the first welding chamber 301.

[0064] In a preferred embodiment, heating devices are installed on the extrusion cylinder 1, the flow guide component 5, the upper die 2, and the lower die 3 to heat the metal billet 6 during extrusion molding, so as to ensure the temperature required for extrusion molding.

[0065] Example 2

[0066] like Figures 9-12 As shown, this embodiment provides a method for extruding a ribbed component using a ribbed component integral extrusion molding die 100 based on Embodiment 1, comprising the following steps:

[0067] S1. Obtain the metal billet 6, heat the metal billet 6 to a specific temperature, and place the metal billet 6 into the inner cavity of the extrusion cylinder 1;

[0068] S2. The metal billet 6 is extruded along the center line of the extrusion cylinder 1 and toward the upper mold 2, so that the metal billet 6 enters the component forming cavity 4 along the first guide channel 203, and enters the rib forming groove 205 along the second guide channel 204 to form the initial formed part.

[0069] S3. Take out the initial molded part and remove the excess material from the initial molded part to obtain the first ribbed cylindrical component 8.

[0070] Furthermore, the extrusion molding method for ribbed components provided in this embodiment also includes: S4, cutting and flattening the first ribbed cylindrical component 8 to form a ribbed wall panel 9.

[0071] Furthermore, the extrusion molding method for ribbed components provided in this embodiment also includes: S5, processing the ribbed wall panel 9 into an arc wall panel, and sequentially fixing and connecting multiple arc wall panels of the same diameter to form a second ribbed cylindrical component 10.

[0072] Further, S3 includes: taking out the initial molded part, removing excess material from the initial molded part to obtain a first ribbed cylindrical member 8 with a diameter of d and a length of l; S5 includes: processing the ribbed wall plate 9 into an arc wall plate with a diameter of D and a length of h, where h≤l, and sequentially fixing and connecting D / d arc wall plates with a diameter of D and a length of h to form a second ribbed cylindrical member 10.

[0073] In a preferred embodiment, the method for obtaining the metal billet 6 in S1 includes: adding pure metal to a resistance furnace by weight percentage and heating it until completely melted; sequentially adding Zn, Cu, Zr, Mg, etc., to the melting furnace; after the alloy is completely melted, raising the temperature to 800-900°C and holding it at that temperature for 20 minutes; then adding a mixed gas for refining; finally adding a refining agent for further refining; letting it stand for 10 minutes before casting; and then undergoing a homogenization heat treatment to obtain the metal ingot for extruded profiles.

[0074] In a more preferred embodiment, the metal billet 6 is an aluminum alloy, magnesium alloy, or other metal. The amount of Zn added is 5.5–6%, Cu added is 0.2–0.25%, Zr added is 0.1–0.12%, and Mg added is 1–1.5%. The mixed gas is 5–10% argon and chlorine, and the refining time is 20–30 minutes. The refining agent is an Al-5Ti-B master alloy, added at 0.02–0.03%.

[0075] In a preferred embodiment, S1 further includes: mounting the integral extrusion die 100 for the ribbed component on the hydraulic press worktable, and fixing the punch plate 7 to the punch of the hydraulic press; the movement of the hydraulic press is used to move the punch plate 7 to extrude the billet, and the extrusion speed of the metal billet 6 is 2-2.5 mm / s. The punch plate 7 is matched with the extrusion cylinder 1 with a clearance fit, the clearance width being 0.1-0.3 mm, ensuring that the punch plate 7 can move axially within the extrusion cylinder 1 to feed the metal billet 6 into the guide component 5. The hydraulic press is preferably a double-action extruder.

[0076] In a preferred embodiment, S1 further includes: applying an oil-based lubricant to the inner wall of the upper mold 2, the inner wall of the lower mold 3, and the outer wall of the metal billet 6 before loading the metal billet 6. Before loading the metal billet 6, the metal billet 6 needs to be heated to 250°C–450°C and kept at that temperature, and the mold needs to be preheated to 260°C–460°C and kept at that temperature.

[0077] In a preferred embodiment, the method for processing the ribbed wall panel 9 into an arc-shaped wall panel includes: placing the ribbed wall panel 9 on a bending machine or a roll bending machine, and obtaining the arc-shaped wall panel through an equidistant bending or roll bending process. To improve the bending or roll bending accuracy, the ribbed wall panel 9 can be subjected to annealing and stretching treatment beforehand. The ribs on the arc-shaped wall panel can be located on the side closer to the center or on the side farther from the center. In a more preferred embodiment, the annealing temperature is 150℃~300℃, and the stretching amount is 1%~2%.

[0078] In a preferred embodiment, multiple arc-shaped wall panels of the same diameter are welded together to form a second ribbed cylindrical component 10, such as by friction stir welding, arc welding, or plasma welding.

[0079] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A die for integral extrusion molding of ribbed components, characterized in that: It includes an extrusion cylinder, an upper die, and a lower die, wherein: The upper mold includes a flow guide body and a mandrel. One end of the flow guide body is fixedly connected to one end of the mandrel. The upper mold is provided with a first flow guide channel and a second flow guide channel extending along the length direction of the upper mold. There are multiple first flow guide channels and at least one second flow guide channel. The outer wall of the mandrel is provided with a rib forming groove extending along the length direction of the upper mold. Each first flow guide channel can penetrate the flow guide body. The outlet of each first flow guide channel is located on the outside of the mandrel. Each rib forming groove is connected to one of the second flow guide channels. One end opening of the extrusion cylinder is connected to each of the first flow channels and each of the second flow channels, and the other end opening of the extrusion cylinder allows the metal billet to enter the inner cavity of the extrusion cylinder; The lower mold has a through hole extending through the lower mold along the center line direction. The end of the flow guide body away from the extrusion cylinder is sealed and connected to one end of the lower mold. The mandrel can extend into the through hole. A component forming cavity is formed between a portion of the outer wall of the mandrel and a portion of the inner wall of the lower mold. Each of the first flow guide channels communicates with the component forming cavity, and each of the rib forming grooves communicates with the component forming cavity.

2. The integral extrusion molding die for ribbed components according to claim 1, characterized in that: It also includes a flow guiding component, which is disposed between the upper mold and the extrusion cylinder, and the two ends of the flow guiding component are respectively sealed to the upper mold and the extrusion cylinder. The flow guiding component has multiple third flow guiding channels and at least one fourth flow guiding channel. The first flow guiding channel corresponds one-to-one with the third flow guiding channel, and the second flow guiding channel corresponds one-to-one with the fourth flow guiding channel.

3. The integral extrusion molding die for ribbed components according to claim 1, characterized in that: The upper mold also includes at least one baffle, which is fixedly connected to the mandrel. At least one baffle is provided at the entrance of each rib forming groove, and the baffle can block or enclose part of the entrance of the corresponding rib forming groove.

4. The integral extrusion molding die for ribbed components according to claim 2, characterized in that: The flow area of ​​the first flow channel is greater than that of the second flow channel, and the flow area of ​​the third flow channel is greater than that of the fourth flow channel.

5. The integral extrusion molding die for ribbed components according to claim 2, characterized in that: At least one of the first flow channel, the second flow channel, the third flow channel, and the fourth flow channel is inclined from the side closer to the extrusion cylinder toward the straight line away from the center line of the upper mold.

6. The integral extrusion molding die for ribbed components according to claim 1, characterized in that: The lower mold is provided with a first welding chamber, a second welding chamber, and a forming hole with decreasing inner diameter from one end near the upper mold to the other end of the lower mold. The first welding chamber, the second welding chamber, and the forming hole are connected in sequence to form the through hole. The first welding chamber is connected to each of the first flow channels. The end of the mandrel away from the flow guide body has a component forming outer wall. The inner wall of the forming hole and the component forming outer wall form the component forming cavity. The forming hole is connected to a plurality of rib forming grooves.

7. A method for extruding ribbed components using an integral extrusion die for ribbed components according to any one of claims 1-6, characterized in that: Includes the following steps: S1. Obtain a metal billet, heat the metal billet to a specific temperature, and place the metal billet inside the extrusion cylinder; S2. The metal billet is extruded along the center line of the extrusion cylinder and toward the upper mold, so that the metal billet enters the component forming cavity along the first guide channel, and the metal billet enters the rib forming groove along the second guide channel to form an initial formed part; S3. Take out the initial molded part and remove the excess material from the initial molded part to obtain the first ribbed cylindrical component.

8. The extrusion molding method for ribbed components according to claim 7, characterized in that: Also includes: S4. Cut and flatten the first ribbed cylindrical component to form a ribbed wall panel.

9. The extrusion molding method for ribbed components according to claim 8, characterized in that: Also includes: S5. The ribbed wall panel is processed into an arc wall panel, and multiple arc wall panels with the same diameter are sequentially fixed and connected to form a second ribbed cylindrical component.

10. The extrusion molding method for ribbed components according to claim 9, characterized in that: S3 includes: taking out the initial molded part, removing excess material from the initial molded part, and obtaining the first ribbed cylindrical component with a diameter of d and a length of l; S5 includes: processing the ribbed wall panel into an arc wall panel with a diameter of D and a length of h, where h ≤ l, and sequentially fixing and connecting D / d arc wall panels with a diameter of D and a length of h to form the second ribbed cylindrical component.

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