Forming die and processing method of inner grid reinforcing rib

Abstract

The application discloses a forming die for inner grid reinforcing rib, which comprises a mandrel, a plurality of key grooves are arranged on both ends of the mandrel along the length direction of the mandrel; a die core is sleeved on the mandrel, and uniform staggered transverse grooves and longitudinal grooves are distributed on the outer wall of the die core; a lower die assembly is arranged along the length direction of the die core, and comprises a lower die plate, a gasket arranged between the lower die plate and the die core and a first recessed die; an upper die assembly is arranged along the length direction of the die core and is oppositely arranged with the lower die assembly, and comprises an upper die plate and a second recessed die arranged between the upper die plate and the die core; and a limiting ring assembly is arranged at both ends of the die core along the length direction and is in clamping connection with the key grooves. The die core is in a separated combination, the product blank is deformed under the action of the recessed die, the inner grid reinforcing rib is formed, the product is convenient to disassemble, the size is stable, and the productivity of the inner grid reinforcing rib and the quality reliability are improved. The application further discloses a processing method for the inner grid reinforcing rib, which is processed by using the forming die.

Description

Technical Field

[0001] This invention belongs to the field of internal mesh reinforcing rib forming technology, specifically relating to a forming mold and processing method for internal mesh reinforcing ribs. Background Technology

[0002] The core component of the aerospace product is made of aluminum alloy. It is a thin-walled component with a length of nearly 2 meters, a diameter of over 1 meter, and a wall thickness of 0.15 meters (see...). Figure 1 and Figure 2 The internal structure consists of a grid-like reinforcing rib, which is used in important components of the core layer of aerospace products. The main function of the grid-like reinforcing rib is to improve the pressure-bearing capacity.

[0003] If the internal mesh reinforcing ribs are machined using CNC machine tools, on the one hand, because they are thin-walled parts, they are easily deformed or even scrapped under the cutting force of CNC machine tools; on the other hand, referring to... Figure 2 As can be seen, the intersections of the grid have rounded corners, so the rounded corners also need to be processed during the manufacturing process, which is labor-intensive and time-consuming. Summary of the Invention

[0004] To address the aforementioned problems, this invention aims to provide a molding die for an inner mesh reinforcing rib. It employs the principle of die extrusion molding, with the die core being a separate assembly. The product blank extends and deforms under the action of the die to form the inner mesh reinforcing rib.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A molding die for an inner mesh reinforcing rib includes a mandrel, with multiple keyways provided at both ends along the length of the mandrel.

[0007] The mold core is fitted onto the mandrel, and evenly spaced intersecting transverse and longitudinal grooves are distributed along the outer wall of the mold core.

[0008] The lower mold assembly is arranged along the length of the mold core, and includes a lower template, a pad and a first cavity mold arranged sequentially between the lower template and the mold core.

[0009] The upper mold assembly is arranged along the length of the mold core and is positioned opposite to the lower mold assembly. It includes an upper template and a second cavity mold disposed between the upper template and the mold core.

[0010] The limiting ring assemblies are respectively located at both ends of the mold core along its length and are connected by keyways.

[0011] Preferably, the mandrel includes a first shaft arranged in the shape of a frustum, a second shaft respectively disposed at both ends of the first shaft, and a third shaft connected to the second shaft; the mold core is mounted on the first shaft.

[0012] Preferably, the keyways are located at both ends of the first shaft and are evenly distributed along the circumference.

[0013] Preferably, the lower template, the pad, and the first die are detachably connected; the upper template and the second die are detachably connected.

[0014] Preferably, the limiting ring assembly is divided into a large-end limiting ring assembly and a small-end limiting ring assembly, and each of them includes an annular limiting ring, a raised key located in the middle of the annular limiting ring and matching the keyway, a guide groove located on the end face of the annular limiting ring, a guide post installed in the guide groove, and an ejector screw arranged along the side wall of the annular limiting ring.

[0015] Preferably, a large-end clamping nut is provided at the end of the large-end limiting ring assembly that is away from the mold core; a small-end clamping nut is provided at the end of the small-end limiting ring assembly that is away from the mold core; the large-end clamping nut and the small-end clamping nut are respectively installed on the second shaft.

[0016] A method for processing internal mesh reinforcing ribs, comprising the following steps using the forming mold:

[0017] Step 1: Install the mold core onto the mandrel and assemble it with the large end limit ring assembly; fit the product blank onto the outer wall of the mold core, assemble the small end limit ring assembly, install the small end clamping nut, and tighten the mandrel; then install the large end clamping nut.

[0018] Step 2: Securely connect the lower mold assembly and the upper mold assembly respectively; install the assembly from Step 1 into the lower mold assembly, fix the lower mold assembly to the lower worktable of the equipment, and fix the upper mold assembly to the upper worktable of the equipment.

[0019] Step 3: Under the pressure of the equipment, the upper mold assembly squeezes the product blank. After the pressure is released, the mandrel is rotated and pressure is applied to the upper mold assembly again to form the product blank.

[0020] Step 4: After the product blank is formed, remove the small end clamping nut and the large end clamping nut, remove the mandrel, install the ejector screw, separate the mold core from the formed product, and then remove the small end limit ring assembly; take out the formed product.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] This invention discloses a molding die for an inner mesh reinforcing rib. Utilizing the plasticity of the metal material, it undergoes extrusion and plastic extension under external force, filling the transverse and longitudinal grooves on the die core surface. The assembled blank is then extruded and formed. Rotating the die core ensures uniform deformation of the product blank under stress. Simultaneously, end-positioning rings restrict the internal and external extension of the metal. The die core is designed for a separate assembly. Under the action of the die, the product blank extends and deforms, forming the inner mesh reinforcing rib. This improves the productivity and reliability of the inner mesh reinforcing rib, ultimately meeting the requirement that the product's internal shape be a crisscrossing mesh-like reinforcing rib. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the internal mesh reinforcing ribs in this invention;

[0025] Figure 2 for Figure 1 A magnified view of a section at point M;

[0026] Figure 3 This is a cross-sectional view of a molding die for an inner mesh reinforcing rib according to the present invention;

[0027] Figure 4 This is a schematic diagram of the mandrel structure in this invention;

[0028] Figure 5 This is a schematic diagram of the assembly of the mold core in this invention;

[0029] Figure 6 This is a schematic diagram of the structure of the large-end limiting ring assembly (small-end limiting ring assembly) in this invention;

[0030] Reference numerals: 1-Lower template, 2-First die cavity, 3-Large end limiting ring assembly, 4-Large end clamping nut, 5-Mandrel, 6-Guide post, 7-Ejection screw, 8-Mold core, 9-Second die cavity, 10-Upper template, 11-Small end limiting ring assembly, 12-Small end clamping nut, 13-Pad, 14-Blank, 15-First shaft, 16-Second shaft, 17-Third shaft, 18-Keyway, 19-Transverse groove, 20-Longitudinal groove, 21-Annular limiting ring, 22-Protruding key, 23-Guide groove. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0032] Combined with reference Figures 3 to 6 The present invention provides a molding die for an inner mesh reinforcing rib, which adopts the principle of die extrusion molding. The die core 8 is assembled in a separate manner, and the product blank 14 is extended and deformed under the action of the die to form an inner mesh reinforcing rib.

[0033] The molding die includes a mandrel 5, with multiple keyways 18 provided at both ends along the length of the mandrel 5. Specifically, the mandrel 5 includes a first shaft 15 arranged in a frustum shape, a second shaft 16 respectively located at both ends of the first shaft 15, and a third shaft 17 connected to the second shaft 16. The keyways 18 are located at both ends of the first shaft 15 and are evenly distributed along the circumference. In this embodiment, the taper of the first shaft 15 is 3 degrees. Eight keyways 18 are provided along the length of the first shaft 15.

[0034] The mold core 8 is fitted on the first shaft 15 of the mandrel 5, and has evenly intersecting transverse grooves 19 and longitudinal grooves 20 distributed along the outer wall of the mold core 8.

[0035] The lower mold assembly is arranged along the length of the mold core 8, and includes a lower template 1, a pad 13 and a first concave mold 2 arranged sequentially between the lower template 1 and the mold core 8; specifically, the lower template 1, the pad 13 and the first concave mold 2 are detachably connected; in this embodiment, the lower template 1, the pad 13 and the first concave mold 2 are connected as one unit by hexagonal screws.

[0036] The upper mold assembly is arranged along the length of the mold core 8 and is arranged opposite to the lower mold assembly. It includes an upper template 10 and a second concave mold 9 disposed between the upper template 10 and the mold core 8. Specifically, the upper template 10 and the second concave mold 9 are detachably connected. In this embodiment, the upper template 10 and the second concave mold 9 are also connected by hexagonal socket screws.

[0037] The limiting ring assemblies are respectively located at both ends of the mold core 8 along its length and are engaged with the keyways 18. The limiting ring assemblies are divided into a large-end limiting ring assembly 3 and a small-end limiting ring assembly 11. The large-end limiting ring assembly 3 and the small-end limiting ring assembly 11 have the same structure, each including an annular limiting ring 21, a raised key 22 located in the middle of the annular limiting ring 21 and mating with the keyway 18, a guide groove 23 on the end face of the annular limiting ring 21, a guide post 6 installed in the guide groove 23, and an ejector screw 7 arranged along the side wall of the annular limiting ring 21. In this embodiment, eight keyways 18 are respectively provided along the length of the first shaft 15. Correspondingly, eight raised keys 22 are provided on the large-end limiting ring assembly 3, and eight raised keys 22 are also provided on the small-end limiting ring assembly 11.

[0038] A large end clamping nut 4 is provided at the end of the large end limiting ring assembly 3 that is away from the mold core 8; a small end clamping nut 12 is provided at the end of the small end limiting ring assembly 11 that is away from the mold core 8; the large end clamping nut 4 and the small end clamping nut 12 are respectively installed on the second shaft 16.

[0039] The present invention also provides a method for processing internal mesh reinforcing ribs, wherein the internal mesh reinforcing ribs are processed using the forming mold, and the method includes the following steps:

[0040] Step 1: Install the mold core 8 onto the mandrel 5 and assemble it with the large end limiting ring assembly 3; fit the product blank 14 onto the outer wall of the mold core 8, assemble the small end limiting ring assembly 11, and install the small end clamping nut 12; tighten the mandrel 5 so that the mold core 8 expands outward under the action of the taper to reach the required product size; then install the large end clamping nut 4.

[0041] Step 2: Fix the lower mold assembly and the upper mold assembly together, that is, connect the lower template 1, the pad 13 and the first cavity mold 2 together with hexagon socket screws; connect the upper template 10 and the second cavity mold 9 together with hexagon socket screws; install the assembly from Step 1 into the lower mold assembly, fix the lower mold assembly on the lower worktable of the equipment, and fix the upper mold assembly on the upper worktable of the equipment.

[0042] Step 3: Under the action of equipment pressure F, the upper mold assembly squeezes the product blank 14. After the pressure is released, the mandrel 5 is rotated and pressure is applied to the upper mold assembly again. The elongation of the product blank 14 is limited by the large end limiting ring assembly 3 and the small end limiting ring assembly 11 respectively, and the product blank 14 is formed.

[0043] Step 4: After the product blank 14 is formed, remove the small end clamping nut 12 and the large end clamping nut 4, remove the mandrel 5, install the ejector screw 7, and after the mold core 8 is separated from the formed product, remove the small end limiting ring assembly 11; take out the formed product.

[0044] This invention utilizes the structural characteristics of layered components and the plastic properties of metallic materials to allow them to be extruded and plastically extended under external force, filling the transverse grooves 19 and longitudinal grooves 20 on the surface of the mold core 8. The assembly blank 14 is then extruded and formed under pressure. Rotating the mold core 8 ensures that the product blank 14 is deformed uniformly under force. At the same time, the limiting ring assemblies at both ends restrict the internal and external extension of the metal, ultimately meeting the requirement that the internal shape of the product is a grid-like reinforcing rib.

[0045] This invention utilizes the principle that the volume remains unchanged before and after molding. The mold core 8 adopts a separate assembly, which is conducive to the flow and molding of metal, as well as the disassembly of the product, while ensuring the stability of the product dimensions.

[0046] This invention uses a mold core 8 to expand the blank 14 under the action of the tapered mandrel 5, and shrinks to remove the product. The horizontal groove 19 and the vertical groove 20 that are evenly divided after the mold core 8 expands just meet the size of the inner mesh reinforcing ribs of the product. When shrinking, the horizontal groove 19 and the vertical groove 20 can ensure that the outer size of the mold core 8 is smaller than the inner diameter of the product, so that the product can be smoothly removed and the entire product forming process is completed.

[0047] The foregoing has provided a detailed description of the molding die and processing method for an internal mesh reinforcing rib provided by the present invention. Specific examples have been used to illustrate the structure and working principle of the present invention. The descriptions of the above embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A forming die for an inner grid reinforcing bar, characterized by: It comprises a mandrel (5), a plurality of keyways (18) are arranged on both ends of the mandrel (5) along the length direction of the mandrel (5); A mold core (8) is sleeved on the mandrel (5), and uniform and staggered transverse grooves (19) and longitudinal grooves (20) are arranged on the outer wall of the mold core (8); A lower mold assembly is arranged along the length direction of the mold core (8), and comprises a lower mold plate (1), a gasket (13) and a first recessed mold (2) which are sequentially arranged between the lower mold plate (1) and the mold core (8); An upper mold assembly is arranged along the length direction of the mold core (8) and is arranged opposite to the lower mold assembly, and comprises an upper mold plate (10) and a second recessed mold (9) arranged between the upper mold plate (10) and the mold core (8); A limiting ring assembly is arranged on both ends of the length direction of the mold core (8) and is connected with the keyways (18) in a clamping manner; The mandrel (5) comprises a first shaft (15) arranged in a circular truncated cone shape, second shafts (16) arranged on both ends of the first shaft (15) respectively, and a third shaft (17) connected with the second shafts (16); and the mold core (8) is mounted on the first shaft (15); The limiting ring assembly comprises a large-end limiting ring assembly (3) and a small-end limiting ring assembly (11), and each of the limiting ring assemblies comprises an annular limiting ring (21), a protruding key (22) arranged in the middle of the annular limiting ring (21) and matched with the keyway (18), a guide groove (23) arranged on the end face of the annular limiting ring (21), a guide column (6) mounted in the guide groove (23), and an ejection screw (7) arranged along the side wall of the annular limiting ring (21).

2. A forming die for internal grid reinforcing bars according to claim 1, characterized in that: The keyways (18) are arranged on both ends of the first shaft (15) and are uniformly distributed along the circumference.

3. The forming die for an inner grid reinforcing rib according to claim 1, characterized by: The lower mold plate (1), the gasket (13) and the first recessed mold (2) are detachably connected; and the upper mold plate (10) and the second recessed mold (9) are detachably connected.

4. The forming die for an inner grid reinforcing rib according to claim 1, characterized by: A large-end pressing nut (4) is arranged on one end of the large-end limiting ring assembly (3) away from the mold core (8); a small-end pressing nut (12) is arranged on one end of the small-end limiting ring assembly (11) away from the mold core (8); and the large-end pressing nut (4) and the small-end pressing nut (12) are mounted on the second shaft (16) respectively.

5. A method of manufacturing an inner grid rib using the forming die according to any one of claims 1 to 4, wherein the inner grid rib is manufactured by the method. The method comprises the following steps: Step 1, mounting the mold core (8) on the mandrel (5) and assembling with the large-end limiting ring assembly (3); sleeving the product blank (14) on the outer wall of the mold core (8), assembling the small-end limiting ring assembly (11) and the small-end pressing nut (12), and tightening the mandrel (5); and then assembling the large-end pressing nut (4); Step 2, fixedly connecting the lower mold assembly and the upper mold assembly respectively; mounting the assembly of step 1 in the lower mold assembly, fixing the lower mold assembly on the lower workbench of the equipment, and fixing the upper mold assembly on the upper workbench of the equipment; Step 3, under the action of the pressure of the equipment, the upper mold assembly extrudes the product blank (14), the mandrel (5) is rotated after pressure relief, the upper mold assembly is pressed again, and the product blank (14) is formed. Step 4, after the product blank (14) is formed, the small end pressing nut (12) and the large end pressing nut (4) are removed, the mandrel (5) is withdrawn, the ejection screw (7) is installed, the mold core (8) is separated from the formed product, and the small end limiting ring assembly (11) is withdrawn; the formed product is removed.

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