Device and method for extruding and stripping a reinforcing element in a cylindrical piece

Abstract

The present application relates to the technical field of cold extrusion of inner rib of cylindrical part, and discloses a kind of extrusion and stripping device and forming method of inner rib of cylindrical part, including cylindrical extrusion core mould, with the forming cavity of two ends open;Lower die seat is set to the bottom end of cylindrical extrusion core mould;Split type extrusion core mould includes a plurality of circumferentially arranged core module, the outer surface of core module is provided with the forming groove for the cross rib of tube blank formation, radial guide mechanism is arranged between core module and lower die seat;Extrusion rod includes the connecting column and guide block, the connecting column is used to be connected with the output end of press, and radial push-pull mechanism is arranged between guide block and core module;Wherein, the pressing of connecting column pushes guide block and drives multiple core modules to expand radially along radial guide mechanism by radial push-pull mechanism, and multiple core modules are driven to contract radially in return stroke, realize the extrusion forming of cross rib of tube blank and automatic stripping, and the extrusion forming and blank stripping action of tube blank can be completed by the present application only with the cooperation of press.

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 rod pushes down the guide block and drives the plurality of core modules to expand radially along the radial guide mechanism through the radial push-pull mechanism, and drives the plurality of core modules to contract radially in return, so that the pipe blank cross rib extrusion forming and automatic demolding are realized.

[0011] Optionally, the radial guide mechanism comprises:

[0012] The dovetail groove is arranged on the lower die seat.

[0013] The dovetail slider is fixedly connected to the bottom end of the core module, and the dovetail slider is in sliding fit with the dovetail groove.

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

[0015] The guide groove is arranged on the inner surface of the core module, and the guide groove has an inclined section with a high-to-low orientation towards the axial direction of the guide block.

[0016] The guide slider is fixedly connected to the guide block, and the guide slider is in sliding fit with the guide groove.

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

[0018] The die clamping block is fixedly connected to the top end of the core module.

[0019] The die clamping lifting groove is arranged on the top end of the guide block, and the die clamping block can abut against the inner wall of the die clamping lifting groove.

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

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

[0022] Optionally, the forming groove comprises at least one of a horizontal groove, a vertical groove and a horizontal-vertical intersecting groove.

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

[0024] Optionally, the material of the pipe blank is aluminum alloy, titanium alloy or steel.

[0025] The application also provides a cylindrical part inner rib extrusion and demolding forming method, comprising the following steps:

[0026] Assembling the cylindrical extrusion core, the lower die seat, the split extrusion core 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 figure: 1, cylindrical extrusion core mold; 2, lower die seat; 3, extrusion rod; 31, rod column; 32, guide block; 4, split extrusion core mold; 41, core block; 42, dovetail slider; 5, pipe blank; 6, dovetail groove; 7, guide slider; 8, guide groove; 9, clamping block; 10, clamping lifting groove. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be apparently and completely described 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 a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0043] Reference Figures 1-5 The present application provides a kind of cylindrical inner rib extrusion and stripping device, comprising:

[0044] Cylindrical extrusion core mold 1, with two ends open forming cavity;

[0045] Lower die seat 2 is used to be connected with the workbench of press, and lower die seat 2 is arranged at the bottom end of cylindrical extrusion core mold 1;

[0046] Split extrusion core mold 4 includes a plurality of circumferentially arranged core blocks 41, the outer surface of the core block is provided with a forming groove for the pipe blank 5 to form cross rib, and a radial guide mechanism is arranged between the core block and the lower die seat 2;

[0047] Extrusion rod 3 includes connected rod column 31 and guide block 32, rod column 31 is used to be connected with the output end of press, and radial push-pull mechanism is arranged between guide block 32 and core block 41;

[0048] Wherein, rod column 31 pushes down guide block 32 and drives a plurality of core blocks 41 to expand radially along radial guide mechanism through radial push-pull mechanism, and a plurality of core blocks 41 are driven to contract radially in return stroke, to realize pipe blank 5 cross rib extrusion forming and automatic stripping.

[0049] During the process of extrusion rod 3 pressing down, a plurality of core blocks 41 move radially outward by the same distance, extrude the inner wall of pipe blank 5, and realize the forming of horizontal rib, vertical rib and cross rib. Split extrusion core mold 4 is designed into horizontal, vertical and horizontal-vertical cross groove structures according to different requirements, so that split extrusion core mold 4 can be quickly and conveniently replaced, thereby extruding and forming horizontal rib, vertical rib and cross rib structures.

[0050] In one embodiment of the present application, the radial guiding mechanism comprises:

[0051] A dovetail groove 6 is formed on the lower die seat 2.

[0052] A dovetail slider 42 is fixedly connected to the bottom end of the core module 41, and the dovetail slider 42 is in sliding fit with the dovetail groove 6.

[0053] During the pressing process, the split extrusion core 4 slides radially outward by the cooperation of the dovetail slider 42 and the dovetail groove 6; during the lifting process, the dovetail slider 42 is in contact with the root of the dovetail groove 6 on the bottom of the mold, and the vertical movement is converted into the horizontal backward movement of the core module 41 by the horizontal constraint of the dovetail groove 6, so that the core module 41 can only move radially.

[0054] Further, the dovetail groove 6 is coated with lubricating oil to reduce the frictional force on the split extrusion core 4.

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

[0056] A guide groove 8 is formed on the inner surface of the core module 41, and the guide groove 8 has an inclined segment that is high to low towards the guide block 32;

[0057] A guide slider 7 is fixedly connected to the guide block 32, and the guide slider 7 is in sliding fit with the guide groove 8.

[0058] The sliding fit of the plurality of guide blocks 32 and the guide groove 8 realizes the axial positioning of the split extrusion core 4 and limits the movement path of the split extrusion core 4 during the pressing and return processes.

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

[0060] A clamping block 9 is fixedly connected to the top end of the core module 41.

[0061] A clamping lifting groove 10 is formed on the top end of the guide block 32, and the clamping block 9 can abut against the inner wall of the clamping lifting groove 10.

[0062] During the pressing process, the guide slider 7 moves downward along the guide groove 8, the diameter of the split extrusion core 4 is expanded, and the extrusion action is completed; during the lifting process, the guide slider 7 slides upward along the guide groove 8, the clamping block 9 moves partially into the structure of the matched clamping lifting groove 10, the diameter of the split extrusion core 4 is gradually reduced, the inner rib of the pipe blank 5 is separated from the split extrusion core 4, and the formed part is demolded.

[0063] Further, the clamping block 9 is designed reversely inclined, and appropriate demolding slope is set to reduce the demolding resistance, so that the product surface can be prevented from being scratched or pinched.

[0064] In one embodiment of the present application, the cylindrical extrusion core mold 1 is detachably connected with the lower mold base 2 through a plurality of screws for quick assembly and disassembly of the cylindrical extrusion core mold 1 and the lower mold base 2.

[0065] In one embodiment of the present application, the split extrusion core mold 4 is coated with a lubricating coating, preferably lubricating oil.

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

[0067] Further, the split extrusion core mold 4 can be a common cylindrical mold without forming groove.

[0068] In one embodiment of the present application, the materials of the cylindrical extrusion core mold 1 and the split extrusion core mold 4 are hot work die steel H13 or nickel-based superalloy.

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

[0070] Further, the lower mold base 2 is connected with the press bed through a T-shaped groove, without the need of designing a special mold for matching use.

[0071] The present application also provides a cylindrical part inner rib extrusion and demolding forming method, comprising the following steps:

[0072] The cylindrical extrusion core mold 1, the lower mold base 2, the split extrusion core mold 4 and the extrusion rod 3 are assembled, specifically, the lower mold base 2 is connected with the press bed through a lower T-shaped groove; the split extrusion core mold 4 is assembled with the dovetail groove 6 of the mold base through the dovetail sliding block 42 at the lower part of the split extrusion core mold 4; in the synchronization process, the guide block 32 of the extrusion rod 3 is axially positioned through the guide sliding block 7 and the guide groove 8, and the rod column of the extrusion rod 3 is connected with the press; the lubricating oil is sprayed on the split extrusion core mold 4 to reduce the friction between the split extrusion core mold 4 and the 3003 aluminum alloy pipe blank 5; the extruded 3003 aluminum alloy pipe blank 5 is sleeved on the split extrusion core mold 4, and three groups of screw holes are arranged between the lower part of the cylindrical extrusion core mold 1 and the lower mold base 2, and fixed through screws for installation of the cylindrical extrusion core mold 1 and the lower mold base 2.

[0073] The output end driving rod column 31 of the press pushes down the guide block 32 and drives the plurality of core modules 41 to expand radially along the radial guide mechanism through the radial push-pull mechanism, so that the tube blank 5 is cross-rib extruded, specifically, during the extrusion process, the extrusion rod 3 connected with the press goes down, the guide sliding block 7 goes down along the guide groove 8, the split extrusion core 4 expands in diameter, expands along the dovetail groove 6 of the lower die seat 2, and a huge pressure is applied to the 3003 aluminum alloy tube blank 5 in the forming cavity to form plastic deformation, and the 3003 aluminum alloy tube blank 5 fully flows in the transverse groove and the longitudinal groove and converges at the intersection to form the cross-rib;

[0074] The output end driving rod column 31 of the press pushes down the guide block 32 and drives the plurality of core modules 41 to expand radially along the radial guide mechanism through the radial push-pull mechanism, so that the tube blank 5 is cross-rib extruded, specifically, during the extrusion process, the extrusion rod 3 connected with the press goes down, the guide sliding block 7 goes down along the guide groove 8, the split extrusion core 4 expands in diameter, expands along the dovetail groove 6 of the lower die seat 2, and a huge pressure is applied to the 3003 aluminum alloy tube blank 5 in the forming cavity to form plastic deformation, and the 3003 aluminum alloy tube blank 5 fully flows in the transverse groove and the longitudinal groove and converges at the intersection to form the cross-rib;

[0075] The processed tube blank 5 is taken out using the clamp.

[0076] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0077] The above-described embodiments are only preferred modes of the present application and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A device for extruding and stripping a rib in a cylindrical member, characterized by, The utility model relates to a kind of extrusion die and extrusion rod, including: Cylindrical extrusion core mould (1) with open forming cavity at both ends; Lower die holder (2) for being connected with the worktable of press machine, the lower die holder (2) is arranged at the bottom end of the cylindrical extrusion core mould (1); Split extrusion core mould (4) includes a plurality of circumferentially arranged core blocks (41), the outer surface of the core block is provided with forming groove for the cross rib of tube blank (5) formation, radial guide mechanism is arranged between the core block and the lower die holder (2); Extrusion rod (3) includes connected stem (31) and guide block (32), the stem (31) is used for being connected with the output end of press machine, radial push-pull mechanism is arranged between the guide block (32) and the core block (41); The radial push-pull mechanism includes: Guide groove (8) is opened on the inner surface of the core block (41), the guide groove (8) has high-to-low inclined section towards the axial direction of the guide block (32); Guide sliding block (7) is fixedly connected on the guide block (32), the guide sliding block (7) is slidably matched with the guide groove (8); The radial push-pull mechanism further includes: Die clamping block (9) is fixedly connected to the top end of the core block (41); Die clamping lifting groove (10) is opened in the top end of the guide block (32), the die clamping block (9) can be abutted with the inner wall of the die clamping lifting groove (10); Wherein, the stem (31) is pressed to push the guide block (32) and drive a plurality of the core block (41) along the radial guide mechanism by the radial push-pull mechanism radial expansion, back drive a plurality of the core block (41) radial contraction, realize the cross rib extrusion forming and automatic demoulding of the tube blank (5); The guide sliding block (7) slides along the guide groove (8) upwards, the die clamping block (9) is partially moved into the structure of the matched die clamping lifting groove (10), the diameter of the split extrusion core mould (4) gradually decreases, and the inner rib of the tube blank (5) is separated from the split extrusion core mould (4).

2. A device for internal ribbing and stripping of a cylindrical workpiece according to claim 1, characterized in that, The radial guide mechanism includes: Dovetail groove (6) is opened on the lower die holder (2); Dovetail sliding block (42) is fixedly connected to the bottom end of the core block (41), and the dovetail sliding block (42) is slidably matched with the dovetail groove (6).

3. A device for internal ribbing and stripping of a cylindrical workpiece as defined in claim 1, wherein The cylindrical extrusion core mould (1) and the lower die holder (2) are detachably connected by a plurality of screws.

4. A device for internal ribbing and stripping of a cylindrical workpiece as defined in claim 1, wherein The surface of the split extrusion core mould (4) is coated with a lubricating coating.

5. A device for extruding and stripping internal ribs from a cylindrical member as defined in claim 1, wherein The forming groove includes at least one of horizontal groove, vertical groove and horizontal-vertical cross groove.

6. A device for internal ribbing and stripping of a cylindrical workpiece as defined in claim 1, wherein The material of the cylindrical extrusion core mould (1) and the split extrusion core mould (4) is hot work die steel H13 or nickel-based superalloy.

7. A device for internal ribbing and stripping of a cylindrical workpiece as defined in claim 1, wherein The material of the tube blank (5) is aluminum alloy, titanium alloy or steel.

8. A method of extrusion and stripping of a tubular part with internal ribs, based on the device for extrusion and stripping of a tubular part with internal ribs according to any one of claims 1 to 7, characterized in that, The utility model relates to a kind of extrusion die and extrusion rod, including: The following steps are included: Assemble the cylindrical extrusion core mould (1), the lower die holder (2), the split extrusion core mould (4) and the extrusion rod (3). The output end of the press drives the rod column (31) to push down 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 pipe blank (5) is cross-rib extruded and formed; The output end of the press drives the rod column (31) to pull up the guide block (32) and drives multiple core modules (41) to contract radially along the radial guide mechanism through the radial push-pull mechanism, so that the core module (41) is automatically demoulded from the pipe blank (5); The finished pipe blank (5) is taken out using a clamp.

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