Method of extrusion forming a cylindrical structure with discontinuous internal reinforcement

Abstract

The present application relates to a kind of extrusion forming method of the discontinuous inner rib of cylindrical structure, belong to forming processing technical field, solve the problem that continuous hot extrusion process in prior art cannot prepare longitudinal equal cross section hot extrusion product, especially the continuous extrusion pipe or cylindrical inner cavity structure product with protruding inner rib structure perpendicular to extrusion direction of inner wall.The present application includes the following steps: determining product parameters;Select forming part and core;Assemble forming device;Charge;Start forming device;Extrude the material to be formed.The present application can extrude forming to generate the cylindrical structure product with integrated inner rib along axial forming, can generate helical inner rib, the generation position and axial length of generated helical inner rib are controllable, the shape of generated helical inner rib is various, and cylindrical structure product can also be continuously produced.

Description

Technical Field

[0001] This invention belongs to the field of molding and processing technology, and in particular relates to an extrusion molding method for a cylindrical structure with discontinuous internal ribs. Background Technology

[0002] Currently, products with large, complex, and lightweight structures are being used in a wider range of applications, and most of these products are manufactured using hot extrusion molding processes.

[0003] To improve the rigidity and strength of hot-extruded products, subsequent reinforcement methods are typically employed, such as welding ribs perpendicular to the extrusion direction or welding reinforcing blocks onto the inner wall of the cylindrical cavity structure. However, this method suffers from low processing efficiency, poor consistency, and low surface accuracy. Therefore, finding a way to incorporate these characteristic structures into the wall panel remains a challenge for the efficient and high-quality manufacturing of such hot-extruded products.

[0004] Current continuous hot extrusion processes cannot produce longitudinally uniform cross-section hot extruded products, especially continuously extruded tubes or cylindrical internal cavity products with raised internal ribs on the inner wall perpendicular to the extrusion direction.

[0005] Therefore, there is an urgent need for an extrusion molding method for a cylindrical structure with discontinuous internal ribs to address the shortcomings of existing technologies and solve the above problems. Summary of the Invention

[0006] Based on the above analysis, the present invention aims to provide an extrusion molding method for a cylindrical structure with discontinuous internal ribs, solving the problem that the existing continuous hot extrusion process cannot produce hot extruded products with longitudinal uniform cross-section, especially continuously extruded tubes or cylindrical cavity structure products with raised internal ribs on the inner wall perpendicular to the extrusion direction.

[0007] The objective of this invention is mainly achieved through the following technical solutions:

[0008] An extrusion molding method for a cylindrical structure with discontinuous internal ribs includes the following steps:

[0009] Determine product parameters;

[0010] Select the molding section and the core section;

[0011] Assembly and molding device;

[0012] Loading;

[0013] Start the molding device;

[0014] Extruding the material to be shaped.

[0015] Furthermore, the product parameters include the material, the outer diameter of the cylindrical structure, the wall thickness of the cylindrical structure, the number of internal ribs, the shape of the internal ribs, the height of the internal ribs, the length of the internal rib section, and the length of the cylindrical section.

[0016] Furthermore, the outer mold is selected based on the outer diameter of the cylindrical structure product.

[0017] Furthermore, the second cylindrical section and the extrusion needle are selected based on the inner diameter of the cylindrical structure product.

[0018] Furthermore, the specifications and quantity of the notches and forming grooves are selected based on the specifications and quantity of the internal ribs.

[0019] Furthermore, the molding section, core section, extrusion section, and drive section are assembled into a molding device.

[0020] Furthermore, when the material to be molded is a cylindrical blank, the material to be molded is placed into the outer mold cavity.

[0021] Furthermore, when the material to be molded is fluid, it is continuously injected into the outer mold cavity through the feeding port.

[0022] Further, activate the drive unit and rotate the rotating rod and core.

[0023] Furthermore, the punch is pushed towards the outer mold, and the punch squeezes the material to be formed.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] (1) The present invention can be extruded to produce a cylindrical structure product with an axially shaped internal rib. The rotating rod used in the present invention is provided with a forming groove, which can cooperate with the notch of the extrusion needle to form a forming channel, thereby producing a cylindrical structure product with an axially shaped internal rib.

[0026] (2) The present invention can generate continuous spiral inner ribs. The rotating rod used in the present invention can drive the core to rotate at the same speed, so that the material to be formed can be partially extruded from the forming channel to form inner ribs, and the inner ribs are continuous spirals.

[0027] (3) The generation position and axial length of the spiral inner ribs generated by the present invention are controllable. The slider used in the present invention can open or close the notch, control the opening and closing of the forming channel, and thus determine whether to generate inner ribs. It can also determine the length and spacing of the spiral inner ribs in the axial direction by adjusting the opening and closing time of the notch.

[0028] (4) The spiral inner ribs generated by the present invention have various shapes. By selecting different inner surface forming grooves, the inner ribs can be various protruding structures with different cross-sectional characteristics, such as triangles, squares, semicircles, ellipses, trapezoids, and irregular shapes.

[0029] (5) The present invention can continuously produce cylindrical structure products. The outer mold of the present invention is provided with a feeding port, through which material can be continuously supplied; the drive unit drives the extrusion needle and the rotating rod to rotate, and after the feeding mechanism is turned on, the entire extrusion molding process will continue, and the cylindrical structure products can be produced without interruption.

[0030] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and drawings. Attached Figure Description

[0031] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0032] Figure 1 This is a flowchart of the molding method of the present invention;

[0033] Figure 2 This is a schematic diagram of the overall structure of the extrusion molding apparatus used in this invention;

[0034] Figure 3 A schematic diagram of a rotating rod with a single forming groove;

[0035] Figure 4 This is a schematic diagram of the core structure;

[0036] Figure 5 This is a schematic diagram of the plug assembly.

[0037] Figure 6 This is a schematic diagram of the internal structure of the extrusion needle;

[0038] Figure 7 This is a schematic diagram of the internal structure of the cylindrical structure with a single internal rib manufactured according to the present invention;

[0039] Figure 8 This is a schematic diagram of a rotating rod with four forming grooves.

[0040] Figure 9 This is a schematic diagram of the internal structure of the cylindrical structure with four internal ribs manufactured according to the present invention;

[0041] Figure 10 This is a schematic diagram of the overall structure of the continuous extrusion molding apparatus used in this invention.

[0042] Reference numerals: 1-Extrusion section; 2-Forming section; 3-Core section; 4-Material to be formed; 5-Drive section; 11-Punch; 12-Punch; 21-Outer mold; 22-Rotating rod; 31-Extrusion pin; 32-Slider; 33-Connecting rod; 34-Push-pull rod; 41-Inner rib section; 42-Cylindrical section; 211-Feeding port; 221-First cylindrical section; 222-Second cylindrical section; 223-Forming groove; 311-Recessed section; 312-Notch; 313-Sliding groove; 314-Push-pull rod compartment; 321-Positioning block. Detailed Implementation

[0043] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0044] Example 1

[0045] A specific embodiment of the present invention, such as Figure 1 As shown, a method for extruding a cylindrical structure with discontinuous internal ribs is disclosed, comprising the following steps:

[0046] Step 1: Determine product parameters;

[0047] Confirm the parameters of the cylindrical structure with internal reinforcement, such as material, outer diameter of the cylindrical structure, wall thickness of the cylindrical structure, number of internal reinforcements, shape of internal reinforcements, height of internal reinforcements, length of internal reinforcement segment 41, and length of cylindrical segment 42.

[0048] Step 2: Select molding part 2 and core part 3;

[0049] Select the appropriate outer mold 21 according to the outer diameter of the cylindrical structure product, select the appropriate second cylindrical section 222 and extrusion needle 31 according to the inner diameter of the cylindrical structure product, and select the specifications and quantity of notch 312 and forming groove 223 according to the specifications and quantity of the inner ribs.

[0050] Step 3: Assemble the molding device;

[0051] The selected molding part 2, core part 3, extrusion part 1 and drive part 5 are assembled into a molding device.

[0052] Step 4: Loading, including the following sub-steps;

[0053] Step 41: Using the molding device of Example 2, the material to be molded 4 is a cylindrical blank, and the material to be molded 4 is placed into the outer mold cavity;

[0054] Step 42: Using the molding device of Example 3, the material to be molded 4 is a fluid, and the material to be molded 4 is continuously injected into the outer mold cavity through the feeding port 211.

[0055] Step 5: Start the molding device;

[0056] Turn on the drive unit 5 and rotate the rotating rod 22 and the core 3.

[0057] Step 6: Begin extruding the material to be shaped 4, including the following sub-steps;

[0058] Step 61: Using the molding device of Example 2, push the punch 12 towards the outer mold 21 to compress the material to be molded 4 and start manufacturing the cylindrical structure product.

[0059] Step 62: Using the molding apparatus of Example 3, the feeding device provides molding pressure to the material to be molded 4, and the manufacturing of the cylindrical structure product begins.

[0060] Step 63: Using the molding device of Example 3, the feeding device injects the material to be molded 4 into the outer mold cavity, closes the feeding port 211, pushes the punch 12 towards the outer mold 21, and squeezes the material to be molded 4 to start manufacturing the cylindrical structure product.

[0061] Step 7: Form the cylindrical structure product;

[0062] The production process is adjusted according to the lengths of the inner rib sections 41 and the cylindrical sections 42 required by the product parameters, and the inner rib sections 41 and cylindrical sections 42 are generated respectively, including the following sub-steps;

[0063] Step 71: Generate internal reinforcement segment 41;

[0064] Pull the push rod 34 outward from the extrusion needle 31. The push rod 34 drives the connecting rod 33. The connecting rod 33 pulls the slider 32 to slide radially toward the first axis, opening the molding channel.

[0065] Step 72: Generate cylindrical segment 42;

[0066] Push the push-pull rod 34 into the extrusion needle 31. The push-pull rod 34 drives the connecting rod 33. The connecting rod 33 pushes the slider 32 to slide away from the first axis in the radial direction, closes the forming channel, and continues to extrude the material to be formed 4 to produce the cylindrical section 42.

[0067] Step 8: End the extrusion molding process.

[0068] Example 2

[0069] Another specific embodiment of the present invention, such as Figure 2 As shown, an extrusion molding apparatus (hereinafter referred to as molding apparatus) for the molding method of Example 1 is disclosed, including an extrusion section 1, a molding section 2 and a core section 3, wherein the core section 3 is connected to the extrusion section 1 and the molding section 2 respectively.

[0070] The molding apparatus of the present invention is used to extrude the material to be molded 4 into a cylindrical structure with internal ribs.

[0071] Preferably, the extrusion section 1 includes a punch 11 and a die 12. One end of the punch 11 is connected to the extrusion equipment (not shown in the figure), and the other end of the punch 11 is connected to one end of the die 12. The punch 11 can drive the die 12 to move under the push of the extrusion equipment, thereby extruding the material to be formed 4.

[0072] Preferably, both the punch 11 and the die 12 include a hollow portion, which is a cylindrical hollow portion. The core 3 is also cylindrical and disposed within the hollow portion. The punch 11 and the die 12 can slide along the core 3. The material to be formed 4 is a cylindrical blank, disposed on the core 3. The die 12 moves along the core 3 toward the material to be formed 4, compressing the material to be formed 4 and shaping it.

[0073] Preferably, the outer diameter of the core 3 is equal to the inner diameter of the punch 12. When the punch 12 extrudes the material to be formed 4, it ensures that the material to be formed 4 will not enter the gap between the core 3 and the punch 12, so as not to waste the material to be formed 4 and to prevent damage to the forming equipment.

[0074] Preferably, the forming part 2 includes an outer mold 21 and a rotating rod 22. The outer mold 21 is mounted on a fixing device (not shown in the figure) and includes an outer mold cavity. One end of the core 3 and the material to be formed 4 are disposed in the outer mold cavity. One end of the rotating rod 22 is connected to the core 3, and there is a gap between the one end of the rotating rod 22 and the outer mold 21. The punch 12 can be inserted into the outer mold cavity and squeeze the material to be formed 4. The material to be formed 4 is extruded from the gap between the one end of the rotating rod 22 and the outer mold 21 to form a cylindrical product.

[0075] Preferably, the outer mold cavity includes an inner mold opening and a forming opening. The longitudinal sections of both the inner mold opening and the forming opening are circular. The inner diameter of the inner mold opening is equal to the outer diameter of the punch 12. When the punch 12 enters the outer mold cavity from the inner mold opening and squeezes the material to be formed 4, it ensures that the material to be formed 4 will not enter the gap between the outer mold 21 and the punch 12, thus avoiding waste of the material to be formed 4.

[0076] Preferably, such as Figure 3As shown, the rotating rod 22 is cylindrical, comprising a first cylindrical segment 221 and a second cylindrical segment 222. The first cylindrical segment 221 is located at one end of the rotating rod 22, and the second cylindrical segment 222 is connected to the first cylindrical segment 221. The rotating rod 22 is connected to the core 3 via the first and second cylindrical segments 221 and 222. The first cylindrical segment 221 can be inserted into the core 3. When the rotating rod 22 is connected to the core 3, the first cylindrical segment 221 ensures that the rotating rod 22 and the core 3 will not be misaligned in the radial direction. The second cylindrical segment 222 is located inside the forming opening, and the outer diameter of the second cylindrical segment 222 is smaller than the inner diameter of the forming opening. The material to be formed 4 is extruded from the gap between the second cylindrical segment 222 and the forming opening to form a cylindrical structure product. The material to be formed 4 includes various metal materials and metal-based composite materials, such as aluminum alloys, magnesium alloys, titanium alloys, aluminum-based composite materials, titanium-based composite materials, or combinations thereof.

[0077] Preferably, the extrusion section 1, the forming section 2, and the core section 3 are coaxial, with the axis being the first axis, and the cylindrical structure product is a cylinder with equal wall thickness.

[0078] Preferably, such as Figure 4 As shown, the core 3 includes a pressing needle 31, which is connected to a first cylindrical section 221 and a second cylindrical section 222. One end of the pressing needle 31 has a recess 311 and a notch 312, with the recess 311 coaxial with the first axis. The first cylindrical section 221 can be inserted into the recess 311, ensuring that the rotating rod 22 and the pressing needle 31 do not misalign in the radial direction.

[0079] Preferably, the end of the extrusion needle 31 connected to the second cylindrical section 222 is the forming end, and the outer diameter of the forming end is the same as the outer diameter of the second cylindrical section 222. The forming end and the second cylindrical section 222 are both disposed within the forming opening. The material to be formed 4 passes through the gap between the forming end, the second cylindrical section 222, and the outer mold 21 to form a cylindrical structure product. The fact that the outer diameter of the forming end is the same as the outer diameter of the second cylindrical section 222 can reduce the resistance during the forming process of the material to be formed 4 and improve the forming quality.

[0080] Preferably, the notch 312 is formed on the outer wall of the forming end. For example... Figure 3 As shown, the outer wall of the second cylindrical section 222 has a forming groove 223. The forming groove 223 has openings on both ends of the second cylindrical section 222. The extrusion needle 31 is connected to the second cylindrical section 222. The notch 312 and the forming groove 223 together form a forming channel. The material to be formed 4 can be partially extruded from the forming channel to form an inner rib of the cylindrical structure product, and the inner rib is formed along the axial direction.

[0081] Preferably, such as Figure 2As shown, the molding apparatus of the present invention further includes a driving unit 5, which is connected to the rotating rod 22. The driving unit 5 can drive the rotating rod 22 to rotate about the first axis. When the extrusion needle 31 is fixed and the rotating rod 22 rotates, when the notch 312 is connected to the molding groove 223, the notch 312 and the molding groove 223 together form a molding channel.

[0082] like Figure 7 As shown, the cylindrical structure product includes multiple inner rib sections 41 and multiple cylindrical sections 42. The inner rib sections 41 have inner ribs on their inner walls, and the inner ribs extend from one end of the inner rib section 41 to the other end. The material to be formed 4 can be partially extruded from the forming channel to form inner ribs, which are spiral in shape, thus forming the inner rib section 41. As the rotating rod 22 continues to rotate, the notch 312 is misaligned with the forming groove 223, and the forming channel cannot be formed. The material to be formed 4 is then extruded into the cylindrical section 42, which has no inner ribs on its inner wall.

[0083] Preferably, by selecting different inner shaped grooves 223, the inner ribs can be various protruding structures with different cross-sectional characteristics, such as triangles, squares, semicircles, ellipses, trapezoids, and irregular shapes.

[0084] However, the internal reinforcement produced by the above scheme is discontinuous, and the axial length of the internal reinforcement segment 41 is uncontrollable. To solve this problem, such as... Figure 4 As shown, the inner wall of the recess 311 is provided with a first tooth, such as... Figure 3 As shown, the outer wall of the first cylindrical section 221 is provided with a second tooth. After the rotating rod 22 and the extrusion needle 31 are connected, the second tooth of the first cylindrical section 221 is connected with the first tooth of the recessed part 311. The rotating rod 22 can drive the extrusion needle 31 and even the core 3 to rotate at the same speed, thereby ensuring that the molding channel can always be unobstructed. The material to be molded 4 can be partially extruded from the molding channel to form an inner rib, and the inner rib is a continuous spiral shape.

[0085] Preferably, such as Figure 5 and Figure 6 As shown, the core 3 also includes a plug assembly disposed within the extrusion needle 31. The plug assembly includes a slider 32 disposed within a notch 312. The slider 32 can slide radially along the extrusion needle 31 within the notch 312 and can open or completely seal the notch 312. When the slider 32 opens the notch 312, the forming channel is unobstructed, and the resulting inner rib is a continuous spiral shape. When the slider 32 closes the notch 312, the forming channel is closed, and the material to be formed 4 is extruded into a cylindrical segment 42. In other words, the slider 32 can open or close the notch 312, controlling the opening and closing of the forming channel, thereby determining whether the inner rib segment 41 is generated. It can also determine the length of the inner rib segment 41 and the length of the cylindrical segment 42 by adjusting the opening and closing time of the notch 312.

[0086] Preferably, such as Figure 5 As shown, the slider 32 is provided with a positioning block 321, and a sliding groove 313 is opened on the inner wall of the notch 312. The sliding groove 313 is arranged radially along the extrusion needle 31. The positioning block 321 can slide along the sliding groove 313 in the sliding groove 313, thereby providing guidance for the movement direction of the slider 32. In addition, during the extrusion molding process, because the notch 312 is blocked, the slider 32 will be squeezed by the material to be molded 4. The positioning block 321 can transmit the pressure to the extrusion needle 31, improve the pressure resistance of the slider 32, and ensure that the slider 32 effectively blocks the notch 312.

[0087] Preferably, such as Figure 5 and Figure 6 As shown, the plug assembly also includes a connecting rod 33 and a push-pull rod 34. The connecting rod 33 is connected to the slider 32 and the push-pull rod 34 respectively. The extrusion needle 31 is also provided with a push-pull rod compartment 314, which can accommodate the push-pull rod 34. Sliding the push-pull rod 34 can open or block the notch 312 of the slider 32.

[0088] In one specific embodiment of the present invention, such as Figure 8 As shown, the rotating rod 22 has four forming grooves 223, which are arranged at 90° intervals around the first axis on the second cylindrical section 222. Correspondingly, one end of the extrusion needle 31 has four notches 312, which are arranged at 90° intervals around the first axis. The extrusion needle 31 also has four sliders 32 and four connecting rods 33, thus forming four opening and closing forming channels, such as... Figure 9 As shown, a single extrusion molding process can produce a cylindrical structure product with four internal ribs on a cross-section perpendicular to the axis.

[0089] In this embodiment, the parameters of the cylindrical structure with internal ribs must first be confirmed, and a suitable forming part 2 and core part 3 are selected according to the parameters. Specifically, a suitable outer mold 21 is selected according to the outer diameter of the cylindrical structure product, a suitable second cylindrical section 222 and extrusion needle 31 are selected according to the inner diameter of the cylindrical structure product, and the specifications and quantity of notch 312 and forming groove 223 are selected according to the specifications and quantity of the internal rib section 41. The forming device of the present invention is assembled; the material to be formed 4 is placed into the cavity between the outer mold 21 and the extrusion needle 31; the drive part 5 is turned on, driving the rotating rod 22 and core part 3 to rotate; towards the outer mold 21 The direction pushes the punch 12 to extrude the material to be formed 4 to start manufacturing the cylindrical structure product; during the production process, the push-pull rod 34 is pulled outward from the extrusion needle 31, the push-pull rod 34 drives the connecting rod 33, the connecting rod 33 pulls the slider 32 to slide radially toward the first axis, opening the forming channel; according to the length requirement of the inner rib section 41 of the cylindrical structure product, the push-pull rod 34 is pushed inward from the extrusion needle 31, the push-pull rod 34 drives the connecting rod 33, the connecting rod 33 pushes the slider 32 to slide radially away from the first axis, closing the forming channel, the inner rib section 41 is produced, and the material to be formed 4 continues to be extruded to produce the cylindrical section 42.

[0090] Compared with the prior art, the rotating rod 22 provided in this embodiment is provided with a forming groove 223, which can cooperate with the notch 312 of the extrusion needle 31 to form a forming channel, and produce a cylindrical structure product with an internal rib formed along the axial direction; the rotating rod 22 can drive the extrusion needle 31 and even the core 3 to rotate at the same speed, so that the material to be formed 4 can be partially extruded from the forming channel to form an internal rib, and the internal rib is a continuous spiral shape; the slider 32 can open or close the notch 312 to control the opening and closing of the forming channel, and thus determine whether to generate the internal rib segment 41. It can also determine the length and spacing of the spiral internal rib in the axial direction by adjusting the opening and closing time of the notch 312; by selecting different internal surface forming grooves 223, the internal rib can be various protruding structures with different cross-sectional characteristics, such as triangles, squares, semicircles, ellipses, trapezoids, and irregular shapes.

[0091] Example 3

[0092] Another specific embodiment of the molding apparatus used in the molding method of the present invention is as follows: Figure 10 As shown, the structure of the outer mold 21 of the molding device in this embodiment and the driving method of the rotating rod 22 and the extrusion needle 31 are different from those in embodiment 2.

[0093] Preferably, the outer mold 21 is provided with a feed port 211, which includes an inner opening and an outer opening. The inner opening is opened in the outer mold cavity, and the outer opening is opened on the outer wall of the outer mold 21 and connected to a feeding mechanism (not shown in the figure). When the material to be molded 4 is fluid, the material to be molded 4 can be continuously injected into the outer mold cavity through the feed port 211.

[0094] Preferably, when the punch 12 is connected to the outer mold 21 and fixed, it can block the outer mold cavity. The pressure of squeezing the material to be formed 4 is provided by the feeding mechanism. If the feeding mechanism cannot provide sufficient forming pressure, the punch 12 can move to the outer mold cavity to provide forming pressure.

[0095] Preferably, the extrusion needle 31 is connected to the drive unit 5, and the drive unit 5 can drive the extrusion needle 31 and even the core 3 to rotate around the first axis. The rotating rod 22 is fixedly connected to the forming end of the extrusion needle 31, and the extrusion needle 31 drives the rotating rod 22 to rotate at the same speed.

[0096] At this time, the drive unit 5 is activated, which drives the extrusion needle 31 and the rotating rod 22 to rotate, activating the feeding mechanism. The material to be formed 4 can be partially extruded from the forming channel into internal ribs, which are spiral in shape; or the forming channel is closed, and the material to be formed 4 is extruded into a cylindrical section 42. The cylindrical structure product is discharged from one end of the rotating rod 22 and enters the subsequent process. The feeding mechanism continuously supplies material, and the entire extrusion molding process continues, forming an uninterrupted production flow of cylindrical structure products; or, if the feeding mechanism cannot provide sufficient molding pressure, the material to be formed 4 is partially extruded from the forming channel into a spiral in shape. After the molding material 4 fills the outer mold cavity, the feed port 211 is closed, and the punch 12 moves into the outer mold cavity to provide molding pressure, extruding the molding material 4 to perform the molding operation. The molding material 4 is extruded into a cylindrical structure product, which is discharged from one end of the rotating rod 22 and enters the subsequent process. When the molding material 4 is insufficient, the punch 12 leaves the outer mold cavity, and at the same time, the feed port 211 is opened, and the feeding mechanism supplies material to fill the outer mold cavity with the molding material 4. The above steps are repeated, and the entire extrusion molding process will continue, so that the cylindrical structure product can be produced without interruption.

[0097] Compared with Example 2, the outer mold 21 provided in this example is provided with a feed port 211, through which material can be continuously supplied; the drive unit 5 drives the extrusion needle 31 and the rotating rod 22 to rotate, and after the feeding mechanism is turned on, the entire extrusion molding process will continue, and the cylindrical structure product can be produced without interruption.

[0098] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for extruding a cylindrical structure with discontinuous internal ribs, characterized in that, Includes the following steps: Determine product parameters; Select the molding section and the core section; An assembly molding device; the assembly molding device includes: assembling a molding part, a core part, an extrusion part, and a driving part into a molding device; the molding device includes an extrusion part, a molding part, a core part, and a driving part; the molding part includes a rotating rod, the rotating rod includes a first cylindrical section and a second cylindrical section; the core part includes an extrusion needle, one end of the extrusion needle is provided with a recess and a notch, the notch is opened on the outer wall of the molding end of the extrusion needle, the outer wall of the second cylindrical section is provided with a molding groove, the notch and the molding groove together form a molding channel; the inner wall of the recess is provided with a first tooth, the outer wall of the first cylindrical section is provided with a second tooth, the second tooth is connected to the first tooth, the rotating rod can drive the extrusion needle to rotate at the same speed, and the material to be molded can be partially extruded from the molding channel into a continuous spiral inner rib; The core also includes a slider, a connecting rod, and a push-pull rod. The slider is positioned inside the notch and can slide radially along the extrusion needle within the notch. The slider has a positioning block, and a sliding groove is formed on the inner wall of the notch, allowing the positioning block to slide along the sliding groove. When the slider opens the notch, the resulting inner rib is a continuous spiral shape. When the slider closes the notch, the material to be formed is extruded into a cylindrical segment. The connecting rod is connected to both the slider and the push-pull rod. The extrusion needle also has a push-pull rod compartment that can accommodate the push-pull rod. Sliding the push-pull rod allows the slider to open or close the notch. Loading: When the material to be formed is a cylindrical blank, put the material to be formed into the outer mold cavity; Start the molding device; Extruding the material to be formed; the material to be formed is a metal material or a metal-based composite material; Forming a cylindrical structure product includes: generating an inner rib section; including: pulling a push-pull rod outward from the extrusion needle, the push-pull rod driving a connecting rod, the connecting rod pulling a slider to slide radially toward the first axis, opening the forming channel; generating a cylindrical section includes: pushing a push-pull rod inward from the extrusion needle, the push-pull rod driving a connecting rod, the connecting rod pushing a slider to slide radially away from the first axis, closing the forming channel, continuing to extrude the material to be formed, and producing a cylindrical section.

2. The extrusion molding method for a cylindrical structure with discontinuous internal ribs according to claim 1, characterized in that, The product parameters include the material, the outer diameter of the cylindrical structure, the wall thickness of the cylindrical structure, the number of internal ribs, the shape of the internal ribs, the height of the internal ribs, the length of the internal rib section, and the length of the cylindrical section.

3. The extrusion molding method for a cylindrical structure with discontinuous internal ribs according to claim 1, characterized in that, The selected molding portion and core include: Select the outer mold based on the outer diameter of the cylindrical structure product.

4. The extrusion molding method for a cylindrical structure with discontinuous internal ribs according to claim 3, characterized in that, The selected molding portion and core portion further include: Select the second cylindrical section and extrusion needle based on the inner diameter of the cylindrical structure product.

5. The extrusion molding method for a cylindrical structure with discontinuous internal ribs according to claim 3, characterized in that, The selected molding portion and core portion further include: Select the specifications and quantity of notches and forming grooves based on the specifications and quantity of the internal reinforcement.

6. The extrusion molding method for a cylindrical structure with discontinuous internal ribs according to claim 1, characterized in that, The initiation molding device includes: Turn on the drive unit and rotate the rotating rod and core.

7. The extrusion molding method for a cylindrical structure with discontinuous internal ribs according to claim 1, characterized in that, The extruded material to be formed includes: The punch is pushed towards the outer mold, and the punch squeezes the material to be formed.

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