Cylindrical part inner rib extruding and demolding device and forming method

Abstract

The invention relates to the technical field of cylindrical part inner rib cold extrusion, and discloses a cylindrical part inner rib extrusion and demolding device and a forming method. The cylindrical part inner rib extrusion and demolding device comprises a cylindrical extrusion core mold which is provided with a forming cavity with two open ends; the lower die holder is arranged at the bottom end of the cylindrical extrusion core die; the sectioning type extrusion core mold comprises a plurality of core mold blocks which are arranged in the circumferential direction, the outer surfaces of the core mold blocks are provided with forming grooves used for forming cross ribs by pipe blanks, and a radial guide mechanism is arranged between the core mold blocks and the lower mold base; the extrusion rod comprises a rod column and a guide block which are connected, the rod column is used for being connected with the output end of the press machine, and a radial push-pull mechanism is arranged between the guide block and the core module; wherein the guide block is pushed by downward pressing of the rod column, the multiple core modules are driven by the radial push-pull mechanism to expand in the radial direction along the radial guide mechanism, the multiple core modules are driven by return stroke to contract in the radial direction, pipe blank cross rib extrusion forming and automatic demolding are achieved, and pipe blank extrusion forming and blank demolding actions can be completed only by matching with a press machine.

Description

Technical Field

[0001] This invention relates to the field of cold extrusion technology for internal ribs of cylindrical parts, and in particular to an extrusion and demolding device and forming method for internal ribs of cylindrical parts. Background Technology

[0002] Thin-walled rotary forming of internal ribs of specific shapes and sizes can enhance the strength of thin-walled parts, achieving lightweight construction, or serve as structures for mounting internal components. It has wide applications in aerospace, machinery, and electronics. Traditional machining methods are time-consuming, have low material utilization, and cause significant tool wear and high costs. Cold extrusion forming of internal ribs offers advantages such as lower equipment requirements, near-net-shape forming, and a large aspect ratio, making it a key technology for the precision manufacturing of high-strength, lightweight tubular and cylindrical components.

[0003] Extrusion die design is a core technology in the extrusion forming of cylindrical and tubular parts with internal ribs. The demolding of the blank after the internal ribs are formed is a key aspect of die design. In existing technologies, auxiliary devices are required to demold the blank after each extrusion operation. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for extruding and demolding internal ribs of cylindrical parts, which aims to solve or improve at least one of the above-mentioned technical problems. The extrusion and demolding process does not require auxiliary equipment, thus solving the problem of low positioning accuracy in extrusion, demolding and forming of cylindrical parts.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a device for extruding and demolding the inner ribs of a cylindrical part, comprising:

[0006] A cylindrical extrusion die with forming cavities open at both ends;

[0007] The lower die holder is used to connect to the worktable of the press, and the lower die holder is located at the bottom end of the cylindrical extrusion core die;

[0008] The segmented extrusion core die comprises multiple circumferentially arranged core modules. The outer surface of each core module is provided with forming grooves for forming cross ribs on the tube blank. A radial guide mechanism is provided between the core module and the lower die base.

[0009] The extrusion rod includes a rod column and a guide block connected together. The rod column is used to connect to the output end of the press. A radial push-pull mechanism is provided between the guide block and the core module.

[0010] The downward pressure of the rod pushes the guide block and drives multiple core modules to expand radially along the radial guide mechanism through the radial push-pull mechanism. The return stroke drives multiple core modules to contract radially, thereby realizing the extrusion forming of the tube blank cross ribs and automatic demolding.

[0011] Optionally, the radial guide mechanism includes:

[0012] A dovetail groove is formed on the lower mold base;

[0013] A dovetail slider is fixedly connected to the bottom end of the core module, and the dovetail slider slides in conjunction with the dovetail groove.

[0014] Optionally, the radial push-pull mechanism includes:

[0015] A guide groove is formed on the inner surface of the core module, the guide groove having an inclined section from high to low toward the axial direction of the guide block;

[0016] A guide slider is fixedly connected to the guide block, and the guide slider slides in conjunction with the guide groove.

[0017] Optionally, the radial push-pull mechanism further includes:

[0018] A mold clamping block is fixedly connected to the top of the core module;

[0019] A mold-closing lifting groove is formed at the top of the guide block, and the mold-closing block can abut against the inner wall of the mold-closing lifting groove.

[0020] Optionally, the cylindrical extrusion core die and the lower die base are detachably connected by a plurality of screws.

[0021] Optionally, the surface of the segmented extrusion die is coated with a lubricating coating.

[0022] Optionally, the forming groove includes at least one of a transverse groove, a longitudinal groove, and a transverse-longitudinal intersecting groove.

[0023] Optionally, the cylindrical extrusion die and the segmented extrusion die are made of hot work die steel H13 or nickel-based high-temperature alloy.

[0024] Optionally, the applicable material for the tube blank is aluminum alloy, titanium alloy, or steel.

[0025] The present invention also provides a method for extruding and demolding internal ribs of a cylindrical part, comprising the following steps:

[0026] Assemble the cylindrical extrusion core die, the lower die base, the segmented extrusion core die, and the extrusion rod;

[0027] The output end of the press drives the rod to press down and push the guide block, and through the radial push-pull mechanism, drives multiple core modules to expand radially along the radial guide mechanism, so that the tube blank cross ribs are extruded and formed;

[0028] The return stroke of the press output end drives the rod column to move upward and pull the guide block. Through the radial push-pull mechanism, the multiple core modules are driven to retract radially along the radial guide mechanism, so that the core modules and the tube blank are automatically demolded.

[0029] The finished tube blank is removed using a clamp.

[0030] The present invention discloses the following technical effects:

[0031] 1. This invention solves the problem that traditional internal rib extrusion processes require complex auxiliary equipment to complete a series of actions such as extrusion and demolding.

[0032] 2. This invention achieves dynamic demolding control by adopting a multi-module segmented extrusion core mold with a reliable positioning and limiting structure to improve product forming accuracy and mold working stability, thereby enhancing the quality of tube blank extrusion forming.

[0033] 3. This invention can complete the extrusion forming of tube blanks and the demolding of blanks by only cooperating with a press. The mold structure is simple, and it is convenient to load and unload blanks quickly. The split extrusion core mold can be replaced quickly and conveniently. It is suitable for various transverse rib, longitudinal rib and cross rib structures, which enhances its applicability and usability. Attached Figure Description

[0034] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the segmented extrusion core die structure of the present invention;

[0037] Figure 3 This is a cross-sectional view of the overall structure of the present invention;

[0038] Figure 4 This is a schematic diagram of the extrusion rod structure of the present invention;

[0039] Figure 5 This is a schematic diagram of the core module structure of the present invention.

[0040] In the diagram: 1. Cylindrical extrusion core die; 2. Lower die base; 3. Extrusion rod; 31. Rod column; 32. Guide block; 4. Split-type extrusion core die; 41. Core module; 42. Dovetail slider; 5. Tube blank; 6. Dovetail groove; 7. Guide slider; 8. Guide groove; 9. Mold closing block; 10. Mold closing lifting groove. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] 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.

[0043] Reference Figures 1-5 The present invention provides a device for extruding and demolding the inner ribs of a cylindrical part, comprising:

[0044] A cylindrical extrusion core mold 1 has a forming cavity open at both ends;

[0045] The lower die holder 2 is used to connect with the worktable of the press. The lower die holder 2 is located at the bottom end of the cylindrical extrusion core die 1.

[0046] The segmented extrusion core mold 4 is composed of multiple circumferentially arranged core modules 41. The outer surface of the core module is provided with forming grooves for forming cross ribs of the tube blank 5. A radial guide mechanism is provided between the core module and the lower mold base 2.

[0047] The extrusion rod 3 includes a rod column 31 and a guide block 32 connected together. The rod column 31 is used to connect to the output end of the press. A radial push-pull mechanism is provided between the guide block 32 and the core module 41.

[0048] The downward pressure of the rod 31 pushes the guide block 32 and drives multiple core modules 41 to expand radially along the radial guide mechanism through the radial push-pull mechanism. The return stroke drives multiple core modules 41 to contract radially, thereby realizing the extrusion forming of the tube blank 5 cross ribs and automatic demolding.

[0049] During the pressing process of the extrusion rod 3, multiple core modules 41 move outward radially by the same distance, extruding the inner wall of the tube blank 5 to form transverse ribs, longitudinal ribs, and cross ribs. The segmented extrusion core die 4 is designed with transverse, longitudinal, and transverse-longitudinal cross grooves and other structures according to different needs. The segmented extrusion core die 4 can be quickly and easily replaced to extrude and form structures such as transverse ribs, longitudinal ribs, and cross ribs.

[0050] In one embodiment of the present invention, the radial guide mechanism includes:

[0051] Dovetail groove 6 is formed on the lower mold base 2;

[0052] The dovetail slider 42 is fixedly connected to the bottom of the core module 41, and the dovetail slider 42 slides in conjunction with the dovetail groove 6.

[0053] During the pressing process, the dovetail slider 42 and the dovetail groove 6 cooperate to make the segmented extrusion core mold 4 slide outward in the radial direction; during the lifting process, the trapezoidal section of the dovetail slider 42 contacts the root of the dovetail groove 6 boss at the bottom of the mold, and the vertical motion is converted into the horizontal backward motion of the core module 41 by the horizontal constraint of the dovetail groove 6, which restricts the core module 41 to only move in the radial direction.

[0054] Furthermore, the dovetail groove 6 is coated with lubricating oil, which reduces the frictional force on the segmented extrusion core mold 4.

[0055] In one embodiment of the present invention, the radial push-pull mechanism includes:

[0056] Guide groove 8 is formed on the inner surface of core module 41. Guide groove 8 has an inclined section from high to low toward the axial direction of guide block 32.

[0057] The guide slider 7 is fixedly connected to the guide block 32, and the guide slider 7 slides in conjunction with the guide groove 8.

[0058] Multiple guide blocks 32 and guide grooves 8 slide together to achieve axial positioning of the segmented extrusion core mold 4 and limit the movement path of the segmented extrusion core mold 4 during the pressing and return processes.

[0059] In one embodiment of the present invention, the radial push-pull mechanism further includes:

[0060] The mold clamping block 9 secures the top of the connecting core module 41;

[0061] The mold closing lifting groove 10 is located at the top of the guide block 32, and the mold closing block 9 can abut against the inner wall of the mold closing lifting groove 10.

[0062] During the pressing process, the guide slider 7 moves downward along the guide groove 8, and the diameter of the segmented extrusion core mold 4 expands to complete the extrusion action; during the lifting process, the guide slider 7 slides upward along the guide groove 8, and the mold closing block 9 partially moves into the matching mold closing lifting groove 10 structure, the diameter of the segmented extrusion core mold 4 gradually decreases, and the inner ribs of the tube blank 5 separate from the segmented extrusion core mold 4, realizing the demolding of the formed part.

[0063] Furthermore, the reverse tilt design of the mold clamping block 9, with an appropriate draft angle, reduces demolding resistance and can prevent surface scratches or ejector pin damage to the product.

[0064] In one embodiment of the present invention, the cylindrical extrusion core die 1 and the lower die base 2 are detachably connected by a plurality of screws for quick assembly and disassembly of the cylindrical extrusion core die 1 and the lower die base 2.

[0065] In one embodiment of the present invention, the surface of the segmented extrusion die 4 is coated with a lubricating coating, preferably lubricating oil.

[0066] In one embodiment of the present invention, the forming groove includes at least one of a transverse groove, a longitudinal groove, and a transverse-longitudinal intersecting groove.

[0067] Furthermore, the segmented extrusion core mold 4 can be a common cylindrical mold without forming grooves.

[0068] In one embodiment of the present invention, the cylindrical extrusion die 1 and the segmented extrusion die 4 are made of hot work die steel H13 or nickel-based high-temperature alloy.

[0069] In one embodiment of the present invention, the applicable material for the tube blank 5 is aluminum alloy, titanium alloy or steel, and in this embodiment, 3003 aluminum alloy is preferred.

[0070] Furthermore, the lower mold base 2 is connected to the press worktable via a T-slot, eliminating the need for a dedicated mold for use.

[0071] The present invention also provides a method for extruding and demolding internal ribs of a cylindrical part, comprising the following steps:

[0072] Assemble the cylindrical extrusion die 1, lower die base 2, segmented extrusion die 4, and extrusion rod 3. Specifically, the lower die base 2 is connected to the press worktable via a lower T-slot; the segmented extrusion die 4 is assembled with the dovetail groove 6 of the die base via its lower dovetail slider 42; during the synchronous process, the guide block 32 of the extrusion rod 3 is axially positioned via the guide slider 7 and guide groove 8, and the rod column of the extrusion rod 3 is connected to the press; lubricating oil is sprayed onto the segmented extrusion die 4 to reduce friction between the segmented extrusion die 4 and the 3003 aluminum alloy tube blank 5; the 3003 aluminum alloy tube blank 5 is extruded and fitted onto the segmented extrusion die 4; three sets of screw holes are provided between the lower part of the cylindrical extrusion die 1 and the lower die base 2, and screws are used for fixing the cylindrical extrusion die 1 and the lower die base 2 for installation;

[0073] The output end of the press drives the rod column 31 to push the guide block 32 downward and drives multiple core modules 41 to expand radially along the radial guide mechanism through the radial push-pull mechanism, so that the tube blank 5 is extruded into cross ribs. Specifically, during the extrusion process, the extrusion rod 3 connected to the press moves downward, the guide slider 7 moves downward along the guide groove 8, the diameter of the split extrusion core die 4 expands, and it expands along the dovetail groove 6 of the lower die seat 2, applying huge pressure to the 3003 aluminum alloy tube blank 5 in the forming cavity to form plastic deformation. The 3003 aluminum alloy tube blank 5 flows fully in the transverse and longitudinal grooves and converges at the intersection to form cross ribs.

[0074] The return drive rod 31 at the output end of the press moves upward, pulling the guide block 32 and driving multiple core modules 41 to retract radially along the radial guide mechanism through the radial push-pull mechanism, so that the core modules 41 and the tube blank 5 are automatically demolded. Specifically, during the return stroke, the extrusion rod 3 moves upward, the guide slider 7 slides upward along the guide groove 8, the diameter of the segmented extrusion core mold 4 gradually decreases, and it retracts along the dovetail groove 6 of the lower mold base 2. The mold closing block 9 partially moves into the matching mold closing lifting groove 10 structure. The mold closing block 9 is designed with a reverse tilt to reduce demolding resistance and realize the demolding process. After extrusion, the demolding process has been realized. The diameter of the segmented extrusion core mold 4 decreases, and the inner ribs of the tube blank 5 separate from the segmented extrusion core mold 4, realizing the demolding of the formed part.

[0075] Use a clamp to remove the finished tube blank 5.

[0076] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0077] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for extruding and demolding the inner ribs of a cylindrical part, characterized in that, include: A cylindrical extrusion die (1) has a forming cavity with open ends; The lower die holder (2) is used to connect with the worktable of the press, and the lower die holder (2) is located at the bottom end of the cylindrical extrusion core die (1); The segmented extrusion core die (4) consists of multiple circumferentially arranged core modules (41). The outer surface of the core module is provided with forming grooves for forming cross ribs of the tube blank (5). A radial guide mechanism is provided between the core module and the lower die base (2). The extrusion rod (3) includes a rod column (31) and a guide block (32) connected together. The rod column (31) is used to connect to the output end of the press. A radial push-pull mechanism is provided between the guide block (32) and the core module (41). The downward pressure of the rod (31) pushes the guide block (32) and drives multiple core modules (41) to expand radially along the radial guide mechanism through the radial push-pull mechanism. The return stroke drives multiple core modules (41) to shrink radially, thereby realizing the cross-rib extrusion forming and automatic demolding of the tube blank (5).

2. The cylindrical component internal rib extrusion and demolding device according to claim 1, characterized in that, The radial guiding mechanism includes: A dovetail groove (6) is formed on the lower mold base (2); The dovetail slider (42) is fixedly connected to the bottom end of the core module (41), and the dovetail slider (42) slides in conjunction with the dovetail groove (6).

3. The device for extruding and demolding the inner ribs of a cylindrical part according to claim 1, characterized in that, The radial push-pull mechanism includes: A guide groove (8) is formed on the inner surface of the core module (41), and the guide groove (8) has an inclined section from high to low toward the axial direction of the guide block (32); The guide slider (7) is fixedly connected to the guide block (32), and the guide slider (7) slides in cooperation with the guide groove (8).

4. The extrusion and demolding device for the inner ribs of a cylindrical part according to claim 1, characterized in that, The radial push-pull mechanism further includes: The mold clamping block (9) is fixedly connected to the top of the core module (41); The mold closing lifting groove (10) is provided at the top of the guide block (32), and the mold closing block (9) can abut against the inner wall of the mold closing lifting groove (10).

5. The extrusion and demolding device for the inner ribs of a cylindrical part according to claim 1, characterized in that, The cylindrical extrusion core die (1) and the lower die base (2) are detachably connected by a plurality of screws.

6. The extrusion and demolding device for the inner ribs of a cylindrical part according to claim 1, characterized in that, The surface of the segmented extrusion die (4) is coated with a lubricating coating.

7. The extrusion and demolding device for the inner ribs of a cylindrical part according to claim 1, characterized in that, The formed groove includes at least one of a transverse groove, a longitudinal groove, and a cross-groove.

8. The device for extruding and demolding the inner ribs of a cylindrical part according to claim 1, characterized in that, The cylindrical extrusion die (1) and the segmented extrusion die (4) are made of hot work die steel H13 or nickel-based high-temperature alloy.

9. The extrusion and demolding device for the inner ribs of a cylindrical part according to claim 1, characterized in that, The applicable material for the tube blank (5) is aluminum alloy, titanium alloy or steel.

10. A method for extruding and demolding internal ribs of a cylindrical part, based on the extrusion and demolding device for internal ribs of a cylindrical part according to any one of claims 1-9, characterized in that, Includes the following steps: Assemble the cylindrical extrusion core die (1), the lower die base (2), the segmented extrusion core die (4), and the extrusion rod (3); The output end of the press drives the rod (31) to press down and push the guide block (32), and drives multiple core modules (41) to expand radially along the radial guide mechanism through the radial push-pull mechanism, so that the tube blank (5) is extruded into cross ribs; The return drive of the press output end drives the rod (31) to move upward and pull the guide block (32), and drives multiple core modules (41) to retract radially along the radial guide mechanism through the radial push-pull mechanism, so that the core module (41) and the tube blank (5) are automatically demolded. The finished tube blank (5) is removed using a clamp.

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