Forming device and process for free filling type metal wire embedded solid propellant

Abstract

The invention discloses a free filling type metal wire embedded solid propellant forming device and process, and belongs to the field of solid propellants, the free filling type metal wire embedded solid propellant forming device comprises a bottom plate, a base, a mold cylinder and a top cover are sequentially arranged on the bottom plate, and a plurality of pressing structures are arranged on the upper portion of the top cover; a solid propellant coating barrel is arranged on the inner wall of the mold barrel; the lower end of the metal wire is fixed on the bottom plate, the upper end of the metal wire is fixed on the first fastener of the fastener mounting block on the top cover, and the first fastener is screwed into the threaded hole, so that the metal wire can be tensioned, and the internal stress of the metal wire can be adjusted by adjusting the expansion amount of the metal wire; according to the invention, the collimation of the metal wire in the propellant is ensured, the proper stress of the metal wire in the slurry casting process is also ensured, the problem that the metal wire is broken due to overlarge stress is avoided, and the technical problem that the yield of the solid propellant is low due to the fact that the metal wire is easy to break in the propellant in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the field of solid propellants, and relates to a free-loading composite solid propellant molding process, and in particular to a molding device and a process for a free-loading metal wire embedded solid propellant. Background Art

[0002] For small and medium-sized tactical missiles, in order to meet the requirements of long-term engine operation, the solid propellant charge designed often adopts the end-face combustion type. However, due to the limitation of missile caliber, in order to make the engine achieve long-term high thrust, it can only be achieved by increasing the propellant burning rate. A simple and feasible method is to add metal wires in the grain column, and use the high thermal conductivity of the metal wires to increase the temperature near the propellant, thereby greatly increasing the burning rate of the propellant there, forming a new combustion surface change law, increasing the combustion area, and improving the thrust. Metal wires of different materials and diameters have different thermal conductivity. The number of metal wires and their arrangement in the charge will affect the burning rate performance of the charge. The thickness of the metal wire will affect the growth rate ratio of the propellant. The thinner the metal wire, the higher the growth rate ratio, the easier it is to break during the pouring process, and the molding process is difficult to control. In addition, the metal wire must be kept straight in the propellant as much as possible, otherwise it will affect the working state of the engine. Therefore, how to use the tooling mold to make the embedded metal wire propellant smoothly molded according to the design requirements and improve the yield rate of the molding process is a problem that needs to be considered. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a free-loading metal wire embedded solid propellant forming device and process to solve the technical problem in the prior art that the metal wire is prone to breakage in the propellant resulting in a low solid propellant yield.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems: A free-loading metal wire embedded solid propellant forming device comprises a bottom plate, on which a base, a mold barrel and a top cover are arranged in sequence, and a plurality of pressing structures are arranged on the upper part of the top cover; a solid propellant coating cylinder is arranged on the inner wall of the mold barrel; The top cover comprises a flange fixed on the top of the mold barrel, a plurality of ribs are arranged on the flange at equal intervals, a mounting plate is arranged on the top of the plurality of ribs, a fastener mounting block is arranged on the mounting plate, and a connecting injection hole is opened between the mounting plate and the fastener mounting block; The bottom plate, the base, the solid propellant coating tube and the mounting plate are respectively provided with a plurality of first metal wire passing holes, a plurality of second metal wire passing holes, a plurality of through holes and a plurality of third metal wire passing holes corresponding to each other; The clamping structure includes a plurality of threaded holes formed on the upper side wall of the fastener mounting block, and a first fastener is disposed in each of the threaded holes.

[0005] The present invention also includes the following technical features: The bottom plate and the base, the base and the mold cylinder, and the mold cylinder and the top cover are all connected by flanges.

[0006] A plurality of the first metal wire passing holes are located on a circle with the center of the bottom plate as the center and R as the radius; a plurality of the second metal wire passing holes are located on a circle with the center of the base as the center and R as the radius; a plurality of the through holes are located on a circle with the center of the solid propellant coating cylinder as the center and R as the radius; a plurality of the third metal wire passing holes are located on a circle with the center of the mounting disk as the center and R as the radius.

[0007] The first metal wire passing hole, the second metal wire passing hole, the through hole and the third metal wire passing hole are all provided with transition arcs.

[0008] A circular groove is formed at the bottom of the base plate, a plurality of mounting holes are formed in the circular groove, and a second fastener is formed in the mounting holes.

[0009] The solid propellant coating tube is made of EPDM rubber.

[0010] A molding process of a free-loading type metal wire embedded solid propellant, based on a molding device of the free-loading type metal wire embedded solid propellant, specifically comprises the following steps: Step 1: Use flange to connect the bottom plate to the base; Step 2: prefabricate corresponding through holes at the bottom of the solid propellant coating tube according to the position of the metal wire to be embedded, and place the bottom of the solid propellant coating tube vertically downward into the base; Step 3: Use a flange to connect the mold barrel to the base, place the solid propellant coating cylinder in the mold barrel, and use a flange to connect the top cover to the mold barrel; Step 4, fix the lower end of the metal wire on the bottom plate, pass the upper end of the metal wire through the first metal wire through hole on the bottom plate and the second metal wire through hole on the base in sequence, and then pass through the through hole of the solid propellant coating tube and the third metal wire through hole on the top cover, and then fix it on the first fastener; Step 5, tightening the metal wire by screwing the first fastener into the threaded hole, and using a stress sensor to monitor the stress of the metal wire in real time. When the stress reaches a stress threshold of the metal wire, stop screwing the first fastener in. Step 6: Pour the propellant slurry into the solid propellant coating cylinder through the pouring hole on the top cover, let it stand, and after the propellant slurry solidifies, disassemble the device and take out the charge; The charge includes a solid propellant coating tube, a solid propellant located in the solid propellant coating tube, and a metal wire embedded in the solid propellant; Step seven, cutting off the metal wire outside the solid propellant coating tube and trimming the shape of the charge to obtain a free-loading solid propellant embedded with metal wires.

[0011] Compared with the prior art, the present invention has the following beneficial technical effects: (I) In the present invention, the lower end of the metal wire is fixed to the bottom plate, and the upper end of the metal wire is fixed to the first fastener of the fastener mounting block on the top cover. The metal wire is tightened by screwing the first fastener into the threaded hole, and the internal stress of the metal wire can be adjusted by adjusting the expansion and contraction amount of the metal wire, thereby ensuring the alignment of the metal wire in the propellant and maintaining appropriate stress in the slurry casting process, avoiding the problem of metal wire breakage due to excessive stress, and solving the technical problem in the prior art that the metal wire is prone to breakage in the propellant, resulting in a low yield of solid propellants.

[0012] (II) The device of the present invention is suitable for the molding of all free-loading metal wire embedded propellants. The size of the base and the mold barrel can be designed according to the type of propellant, and the metal wire passing holes on the device can be adjusted according to the number and position of the embedded metal wires, thereby improving the versatility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a test schematic diagram of the present invention; Figure 3 It is a structural schematic diagram of the bottom plate in the present invention; Figure 4 It is a structural schematic diagram of the base in the present invention; Figure 5 It is a schematic diagram of the structure of the top cover in the present invention.

[0014] The meanings of the various reference numerals in the figure are: bottom plate 1, base 2, mold cylinder 3, top cover 4, pressing structure 5, solid propellant coating cylinder 6, metal wire 7, first metal wire passing hole 8, second metal wire passing hole 9, third metal wire passing hole 10, circular groove 11, second fastener 12, injection hole 13; Flange 401, rib 402, mounting plate 403, fastener mounting block 404; Threaded hole 501 and first fastener 502 .

[0015] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0016] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0017] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0018] The present invention provides a free-loading type metal wire embedded solid propellant forming device, comprising a bottom plate 1, on which a base 2, a mold barrel 3 and a top cover 4 are sequentially arranged, and a plurality of pressing structures 5 are arranged on the upper part of the top cover 4; a solid propellant coating cylinder 6 is arranged on the inner wall of the mold barrel 3; The top cover 4 includes a flange 401 fixed on the top of the mold barrel 3, a plurality of ribs 402 are arranged at equal intervals on the flange 401, a mounting plate 403 is arranged on the top of the plurality of ribs 402, a fastener mounting block 404 is arranged on the mounting plate 403, and a connecting injection hole 13 is opened between the mounting plate 403 and the fastener mounting block 404; The bottom plate 1, the base 2, the solid propellant coating tube 6 and the mounting plate 403 are respectively provided with a plurality of first metal wire passing holes 8, a plurality of second metal wire passing holes 9, a plurality of through holes and a plurality of third metal wire passing holes 10 corresponding to each other; The clamping structure 5 includes a plurality of threaded holes 501 formed on the upper side wall of the fastener mounting block 404 , and a first fastener 502 is disposed in each threaded hole 501 .

[0019] In the above technical solution, the lower end of the metal wire 7 is fixed on the base plate 1, and the upper end of the metal wire 7 is fixed on the first fastener 502 of the fastener mounting block 404 on the top cover 4. The metal wire 7 is tightened by screwing the first fastener 502 into the threaded hole 501, and the internal stress of the metal wire 7 is adjusted by adjusting the expansion and contraction amount of the metal wire 7. This ensures the alignment of the metal wire 7 in the propellant and the proper stress of the metal wire 7 during the slurry casting process, thereby avoiding the problem of metal wire breakage due to excessive stress, and solving the technical problem in the prior art that the metal wire is prone to breakage in the propellant, resulting in a low yield of solid propellants.

[0020] In addition, in the top cover 4, the flange 401 is mainly used to connect the mold cylinder; the rib 402 is mainly used to hollow out the side to facilitate the installation of the metal wire; the mounting plate 403 is mainly used to locate the position of the metal wire on the top cover, which is convenient for determining the position of the fastener mounting block 404; the fastener mounting block 404 is mainly used to fix the metal wire, and its shape depends on the layout of the metal wire, such as a hexagon, which is mainly used to fix each metal wire 7.

[0021] Preferably, the top cover 4 is made of No. 45 steel, the lower section is connected to the mold barrel 3 through a flange, the middle section is disc-shaped, and the middle and lower sections are fixedly connected by three ribs. The hollow design can not only ensure the structural strength, but also facilitate observation of the situation inside the mold barrel. The upper section is set to be hexagonal. After the metal wire 7 comes out of the mold barrel 3, it passes through the hole 10 through the third metal wire and is fixed on the first fastener 502 located on the fastener mounting block 404.

[0022] The bottom plate 1 and the base 2, the base 2 and the mold cylinder 3, and the mold cylinder 3 and the top cover 4 are all connected by flanges.

[0023] A plurality of first metal wire passing holes 8 are located on a circle with the center of the bottom plate 1 as the center and R as the radius; a plurality of second metal wire passing holes 9 are located on a circle with the center of the base 2 as the center and R as the radius; a plurality of through holes are located on a circle with the center of the solid propellant coating tube 6 as the center and R as the radius; a plurality of third metal wire passing holes 10 are located on a circle with the center of the mounting plate 403 as the center and R as the radius.

[0024] In the above technical solution, the first metal wire passing hole 8, the second metal wire passing hole 9 and the third metal wire passing hole 10 are respectively arranged on the circumference of the corresponding components, thereby ensuring the alignment of the metal wires in the forming device.

[0025] The first metal wire passing hole 8, the second metal wire passing hole 9, the through hole and the third metal wire passing hole 10 are all provided with transition arcs.

[0026] In the above technical solution, setting the transition arc can reduce the stress between the hole and the metal wire 7, so that the metal wire 7 can pass through the hole smoothly.

[0027] A circular groove 11 is formed at the bottom of the base plate 1 . A plurality of mounting holes 14 are formed in the circular groove 11 . Second fasteners 12 are formed in the mounting holes 14 .

[0028] In the above technical solution, the circular groove 11 is used to arrange the second fastener 12 , and the second fastener 12 is used to fix the lower end of the metal wire 7 .

[0029] The solid propellant coating tube 6 is made of EPDM rubber.

[0030] In the above technical solution, EPDM rubber can meet the process requirements.

[0031] The present invention provides a molding process of a free-loading type metal wire embedded solid propellant, and a molding device based on the free-loading type metal wire embedded solid propellant specifically comprises the following steps: Step 1: Use flange to connect the bottom plate 1 and the base 2; Step 2: prefabricate corresponding through holes at the bottom of the solid propellant coating tube 6 according to the position of the metal wire 7 to be embedded, and place the bottom of the solid propellant coating tube 6 vertically downward into the base 2; Step 3: Use a flange to connect the mold barrel 3 to the base 2, and place the solid propellant coating cylinder 6 in the mold barrel 3, and use a flange to connect the top cover 4 to the mold barrel 3; Step 4: fix the lower end of the metal wire 7 on the bottom plate 1, and pass the upper end of the metal wire 7 through the first metal wire through hole 8 on the bottom plate 1 and the second metal wire through hole 9 on the base 2 in sequence, and then through the through hole of the solid propellant coating tube 6 and the third metal wire through hole 10 on the top cover 4, and then fix it on the first fastener 502; Step 5, the first fastener 502 is screwed into the threaded hole 501 to tighten the metal wire 7, and a stress sensor is used to monitor the stress of the metal wire 7 in real time. When the stress reaches the stress threshold of the metal wire 7, the first fastener 502 is stopped from being screwed in. Step 6: Pour the propellant slurry into the solid propellant coating tube 6 through the pouring hole 13 on the top cover 4, let it stand, and after the propellant slurry solidifies, disassemble the device and take out the charge; The charge includes a solid propellant coating tube 6, a solid propellant located in the solid propellant coating tube 6, and a metal wire 7 embedded in the solid propellant; Step seven, cutting off the metal wire 7 outside the solid propellant coating tube 6 and trimming the charge to obtain a free-loading solid propellant embedded with metal wires.

Claims

1. A free-loading metal wire embedded solid propellant forming device, comprising a base plate (1), characterized in that: The bottom plate (1) is provided with a base (2), a mold cylinder (3) and a top cover (4) in sequence, and a plurality of pressing structures (5) are provided on the upper part of the top cover (4); a solid propellant coating cylinder (6) is provided on the inner wall of the mold cylinder (3); The top cover (4) comprises a flange (401) fixed to the top of the mold barrel (3); a plurality of ribs (402) are arranged at equal intervals on the flange (401); a mounting plate (403) is arranged on the top of the plurality of ribs (402); a fastener mounting block (404) is arranged on the mounting plate (403); a connecting injection hole (13) is provided between the mounting plate (403) and the fastener mounting block (404); The bottom plate (1), the base (2), the solid propellant coating tube (6) and the mounting plate (403) are respectively provided with a plurality of first metal wire passing holes (8), a plurality of second metal wire passing holes (9), a plurality of through holes and a plurality of third metal wire passing holes (10) in a one-to-one correspondence; The clamping structure (5) comprises a plurality of threaded holes (501) formed on the upper side wall of the fastener mounting block (404), and a first fastener (502) is disposed in each of the threaded holes (501).

2. The free-loading wire-embedded solid propellant forming device as claimed in claim 1, characterized in that: The bottom plate (1) and the base (2), the base (2) and the mold cylinder (3), and the mold cylinder (3) and the top cover (4) are all connected by flanges.

3. The free-loading wire-embedded solid propellant forming device as claimed in claim 1, characterized in that: A plurality of the first metal wire passing holes (8) are located on a circumference with the center of the bottom plate (1) as the center and R as the radius; a plurality of the second metal wire passing holes (9) are located on a circumference with the center of the base (2) as the center and R as the radius; a plurality of the through holes are located on a circumference with the center of the solid propellant coating tube (6) as the center and R as the radius; and a plurality of the third metal wire passing holes (10) are located on a circumference with the center of the mounting plate (403) as the center and R as the radius.

4. The free-loading wire-embedded solid propellant forming device as claimed in claim 1, characterized in that: The first metal wire passing hole (8), the second metal wire passing hole (9), the through hole and the third metal wire passing hole (10) are all provided with transition arcs.

5. The free-loading wire-embedded solid propellant forming device as claimed in claim 1, characterized in that: A circular groove (11) is provided at the bottom of the base plate (1), a plurality of mounting holes (14) are provided in the circular groove (11), and a second fastener (12) is provided in the mounting hole (14).

6. The free-loading wire-embedded solid propellant forming device as claimed in claim 1, characterized in that: The solid propellant coating cylinder (6) is made of EPDM rubber.

7. A molding process for a free-loading metal wire embedded solid propellant, characterized in that: The molding device of the free-loading type metal wire embedded solid propellant according to any one of claims 1 to 6 specifically comprises the following steps: Step 1: Using a flange to securely connect the bottom plate (1) and the base (2); Step 2: prefabricate corresponding through holes at the bottom of the solid propellant coating tube (6) according to the position of the metal wire (7) to be embedded, and place the bottom of the solid propellant coating tube (6) vertically downward into the base (2); Step three, using a flange to securely connect the mold barrel (3) to the base (2), while placing the solid propellant coating cylinder (6) in the mold barrel (3), and using a flange to securely connect the top cover (4) to the mold barrel (3); Step 4, fixing the lower end of the metal wire (7) on the bottom plate (1), passing the upper end of the metal wire (7) through the first metal wire through hole (8) on the bottom plate (1) and the second metal wire through hole (9) on the base (2) in sequence, and then passing through the through hole of the solid propellant coating tube (6) and the third metal wire through hole (10) on the top cover (4), and then fixing it on the first fastener (502); Step 5, tightening the metal wire 7 by screwing the first fastener (502) into the threaded hole (501), and using a stress sensor to monitor the stress of the metal wire 7 in real time. When the stress reaches a stress threshold of the metal wire 7, stop screwing the first fastener (502); Step 6, pour the propellant slurry into the solid propellant coating tube (6) through the pouring hole (13) on the top cover (4), let it stand, and after the propellant slurry solidifies, disassemble the device and take out the charge; The charge comprises a solid propellant coating tube (6), a solid propellant located in the solid propellant coating tube (6), and a metal wire (7) embedded in the solid propellant; Step seven, cutting off the metal wire (7) located outside the solid propellant coating tube (6), and trimming the shape of the charge, thus obtaining a free-loading solid propellant embedded with metal wires.

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