Rocket tank arc bottom compression molding die and method

Abstract

The present invention provides a mold and method for forming the arc bottom of a rocket tank, which relates to the field of aerospace manufacturing technology. The mold includes a convex film and a concave film arranged in pairs. The concave film is arranged above the convex film, and the concave portion of the concave film is opposite to the convex portion of the convex film. During the process of pressing the concave film downward under high temperature and high pressure, the prefabricated plate placed between the concave film and the convex film is pressed to form the arc bottom of a spherical shell-shaped semi-finished product. The arc bottom compression molding of the present invention utilizes the shape of the mold and the high temperature and high pressure conditions to laminate the prefabricated plate into the desired shape and structure. It has the advantages of high production efficiency, large-scale production, stable product quality, guaranteed product consistency, high material utilization rate, and reduced cost.

Description

Technical Field

[0001] The present invention relates to the field of aerospace manufacturing technology, in particular to a rocket tank arc bottom compression molding die and method. Background Art

[0002] The manufacturing processes for tank bottoms include the following: Casting: Molten metal is poured into a mold and then cooled and solidified to form the product. Forging: Pressure is applied to a metal billet using a forging hammer or press, deforming it to the desired shape and size. Welding: Two or more metal parts are joined together using methods such as heat or pressure. Machining: Excessive material is removed from the raw material using cutting and grinding to achieve the desired shape and size. 3D Printing: Products are constructed by layering materials. Spinning: This is achieved using methods such as die spinning. Liquid expansion molding: Liquid pressure is used to expand a flexible tube and force it against a rigid mold surface, forming a hollow part. Extrusion: Strong pressure is applied to an aluminum billet placed in a mold cavity, forcing it to undergo directional plastic deformation and then be extruded through the die orifice of the extrusion die, achieving the desired cross-sectional shape and size. Each of these manufacturing processes has its advantages and disadvantages, and the specific process selected should be determined based on factors such as the product's material, structure, and intended use.

[0003] The most common manufacturing process for tank bottoms involves forming the bottom into melon segments and then welding them together to create a complete bottom. This process uses a mold to form aluminum alloy into the desired melon-segment shape with a defined curvature and thickness. This process allows for the manufacture of complex tank components, and the relatively small size of the segments facilitates processing and transportation. However, due to factors such as welding deformation of the aluminum alloy, bottom deviations are often difficult to effectively control. Furthermore, the numerous steps involved result in long production cycles and low efficiency, making it difficult to meet the demands of high-volume, fast-paced production. Summary of the Invention

[0004] In view of this, one of the purposes of the present invention is to provide a rocket tank arc bottom molding die to solve the technical problems in the prior art that the tank arc bottom is formed by melon slices and then welded, and the deviation caused by factors such as welding deformation is difficult to effectively control, and the process is complicated, the production cycle is long, the efficiency is low, and it is difficult to meet the needs of large-scale and fast-paced production.

[0005] A second object of the present invention is to provide a method for molding the arc bottom of a rocket tank.

[0006] In order to achieve one of the above-mentioned purposes, the present invention provides a rocket tank arc bottom compression molding die, including a punch and a die arranged in pairs, the die being arranged above the punch, and the recessed portion of the die facing the protruding portion of the punch. During the process of pressing the die downward under high temperature and high pressure, the prefabricated plate placed between the die and the punch is pressed to form the arc bottom of a spherical shell-shaped semi-finished product.

[0007] Preferably, the concave mold includes an inner concave mold, a ring concave mold and an outer concave mold, and the inner concave mold, the ring concave mold and the outer concave mold are nested and matched in sequence from the inside to the outside.

[0008] Preferably, the inner die and the outer die both slide relative to the ring die, the inner die is used to form the prefabricated panel from the center first, the ring die is used to complete the annular surface forming of the prefabricated panel, and the outer die is used to finally complete the outer peripheral surface forming of the prefabricated panel.

[0009] In order to achieve the second of the above purposes, the present invention provides a molding method using any of the above-mentioned rocket tank arc bottom molding molds, in which the female mold is pressed toward the male mold in succession at different speeds, and each pass is performed continuously in succession without pause, with different pressing strokes and speeds, including the initial state, initial pass molding, intermediate pass molding and final pass molding.

[0010] Preferably, the initial state includes: the die and the punch are in place, the prefabricated plate is located between the die and the punch, and has L-shaped cross-sections with evenly distributed discrete annular cones for positioning and side supports, in preparation for the molding work.

[0011] Preferably, the initial molding process includes: pressing down the inner concave mold, pressing down the ring concave mold at a slightly faster speed, and pressing down the outer concave mold at a faster speed, and each molding speed is in a preset proportional relationship.

[0012] Preferably, the intermediate molding process includes: the inner concave mold stops pressing when it is in place, the ring concave mold continues pressing at a slightly faster speed, and the outer concave mold continues pressing at a faster speed.

[0013] Preferably, the final molding pass includes the inner concave mold and the ring concave mold stopping pressing down when they are in place, and the outer concave mold continues to press down at a slightly faster speed until it stops.

[0014] Preferably, while the concave die is pressed downward, the concave die and the convex die are heated, and the prefabricated board is heated as well.

[0015] Preferably, the die is driven hydraulically, pneumatically or electrically.

[0016] The rocket tank arc bottom compression molding die provided by the present invention has the following technical effects:

[0017] This type of rocket tank arc bottom compression molding die includes a punch and a die, which appear in pairs, and the die is arranged above the punch, with the recessed portion of the die facing the protruding portion of the punch. During the process of the die pressing down under high temperature and high pressure conditions, the prefabricated plate placed between the die and the punch is pressed to form the arc bottom of a spherical shell-shaped semi-finished product. The arc bottom compression molding of the present invention utilizes the shape of the mold and high temperature and high pressure conditions to laminate the prefabricated plates into the required shape and structure, and has the advantages of high production efficiency, large-scale production, stable product quality, guaranteed product consistency, high material utilization rate, and reduced costs.

[0018] The rocket tank arc bottom molding method provided by the present invention has the following technical effects:

[0019] This rocket tank arc bottom compression molding method can produce components with complex curved surfaces and high-quality surfaces. The application of this process will make an important contribution to the rapid development of the aerospace industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 1 is a cross-sectional schematic diagram of a preferred embodiment of a rocket tank arc bottom compression molding die according to the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the cross-section of the concave die of the arc bottom compression molding die for the medium rocket tank;

[0023] Figure 3 yes Figure 1 Axonometric cross-sectional view of the concave die of the compression molding die for the curved bottom of the mid-range rocket tank;

[0024] Figure 4 yes Figure 1 Cross-sectional view of the tank arc bottom of the mid-range rocket tank;

[0025] Figure 5 yes Figure 1 Cross-section of the outer concave die of the compression molding die for the arc bottom of the medium rocket tank;

[0026] Figure 6 yes Figure 1 Cross-sectional view of the ring die of the arc bottom compression molding die for the mid-stage rocket tank;

[0027] Figure 7 yes Figure 1Cross-sectional view of the inner concave die of the compression molding die for the arc bottom of the mid-stage rocket tank;

[0028] Figure 8 yes Figure 1 Cross-sectional view of the first pass of the compression molding die for the arc bottom of the mid-stage rocket tank;

[0029] Figure 9 yes Figure 1 A cross-sectional view of the second pass of the compression molding die for the arc bottom of the mid-stage rocket tank;

[0030] Figure 10 yes Figure 1 Cross-sectional view of the third pass of the compression molding die for the arc bottom of the mid-stage rocket tank;

[0031] Figure 11 yes Figure 1 Schematic cross-sectional view of the compression type of the arc bottom compression molding die for the medium rocket tank.

[0032] in, Figures 1-11 :

[0033] 1. Circular plate; 2. Punch; 3. Die; 31. Inner die; 32. Ring die; 33. Outer die; 4. Arc bottom. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0035] The following is combined with specific Figure 1-11 A preferred embodiment of the compression molding die for the arc bottom 4 of the rocket tank of the present invention is described in detail.

[0036] like Figure 1-3 The figure shows a schematic structural diagram of a compression molding die for the arc bottom 4 of a rocket tank in a preferred embodiment of the present invention. The compression molding die for the arc bottom of the rocket tank includes a punch 2 and a die 3. The punch 2 and the die 3 are arranged in pairs. The die 3 is arranged above the punch 2, and the recessed portion of the die 3 is opposite to the protruding portion of the punch 2. During the process of pressing the die 3 downward under high temperature and high pressure, the prefabricated plate placed between the die 3 and the punch 2 is pressed to form the arc bottom 4 of the spherical shell-shaped semi-finished product.

[0037] In detail, the die 3 of this embodiment includes an inner die 31, a ring die 32 and an outer die 33. Figure 5-7As shown, it is a schematic diagram of the structure of the inner die 31, the ring die 32 and the outer die 33. The inner die, the ring die and the outer die are nested and matched in sequence from the inside to the outside. The inner die and the outer die 33 can slide relative to the ring die. The inner die is used to form the prefabricated panel from the center first, the ring die is used to complete the annular surface forming of the prefabricated panel, and the outer die is used to finally complete the outer peripheral surface forming of the prefabricated panel.

[0038] It should be noted that the prefabricated plate in this embodiment is preferably a circular plate.

[0039] The inner concave die makes the circular plate start to be formed from the center first, the annular surface of the circular plate is formed by the ring die, and the outer concave die finally forms the outer peripheral surface of the circular plate, thereby finally forming the arc bottom 4. The arc bottom 4 of the tank after the circular plate is formed is as shown in FIG. Figure 4 shown.

[0040] like Figure 8-10 As shown, it is a process diagram of a preferred embodiment of the molding method of the arc bottom 4 of the rocket tank of the present invention. The die 3 is pressed toward the punch 2 in succession at different speeds, and each pass is carried out continuously in sequence without stopping. The pressing stroke and speed are different, including the initial state, the initial molding pass, the intermediate molding pass and the final molding pass.

[0041] like Figure 2 As shown, the initial state: the mold is in place, the circular plate is located between the punch and die of the upper and lower molds, and has positioning and side supports. The positioning and side supports are achieved through evenly distributed discrete annular cones with L-shaped cross-sections (not shown, removed during molding, at which time the punch and die are already in contact), preparing for the molding work.

[0042] like Figure 8 As shown, the initial molding pass (first molding pass) is: the inner concave mold is pressed down, the ring concave mold is pressed down at a slightly faster speed, and the outer concave mold is pressed down at a faster speed. The molding speeds are in a certain proportional relationship.

[0043] like Figure 9 As shown, the middle pass molding (second pass molding): the inner concave die stops pressing when it is in place, the ring die continues to press down at a slightly faster speed, and the outer concave die continues to press down at an even faster speed;

[0044] like Figure 10 As shown in the figure, the final molding pass (the third molding pass): the inner concave die and the ring concave die are in place and stop pressing, while the outer concave die continues to press at a slightly faster speed until it stops.

[0045] The above steps are carried out continuously in sequence without stopping, except that the pressing stroke and speed are different.

[0046] As a further preferred embodiment of the present invention, during the pressing process, the punch and die molds need to be heated, and the circular plate needs to be heated to increase the forming speed and enhance the forming effect.

[0047] As a further preferred embodiment of the present invention, the concave die is placed at the bottom and the convex die is placed at the top, and the inner concave die, the ring concave die and the outer concave die are pressed on in sequence to press the circular plate into the shape of the arc bottom 4.

[0048] As a further preferred embodiment of the present invention, hydraulic, pneumatic or electric driving is adopted to realize pressing down or up of the die, and each die part moves independently.

[0049] like Figure 11 As shown, it is a schematic diagram of the mold pressing molding structure. The pressing order and speed are that the parts of the die 3 are pressed in sequence at different speeds. Each pass is carried out continuously in sequence without pause, except that the pressing stroke and speed are different.

[0050] Initial state: The mold is in place, with the circular plate 1 located between the upper and lower die punches 2 and the die 3, with the die acting as a positioning and side support in preparation for molding.

[0051] Initial die pressing: the inner die 31 is pressed, the ring die 32 is pressed slightly faster, and the outer die 33 is pressed even faster. The die pressing speeds are in a certain proportional relationship.

[0052] Middle pass molding: the inner concave die 31 stops pressing when it is in place, the ring die 32 continues pressing at a slightly faster speed, and the outer concave die 33 continues pressing at a faster speed;

[0053] Final molding pass: the inner concave mold 31 and the ring concave mold 32 stop pressing when they are in place, and the outer concave mold 33 continues to press at a faster speed until it stops.

[0054] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A molding method using a rocket tank arc bottom molding die, characterized in that: The rocket tank arc bottom die forming die includes a male die and a female die arranged in pairs, wherein the female die is arranged above the male die, and the concave portion of the female die is opposite to the convex portion of the male die. When the female die is pressed downward under high temperature and high pressure, the prefabricated plate placed between the female die and the male die is pressed to form the arc bottom of the spherical shell-shaped semi-finished product; The concave mold includes an inner concave mold, a ring concave mold and an outer concave mold, and the inner concave mold, the ring concave mold and the outer concave mold are nested and matched in sequence from the inside to the outside; The inner concave mold and the outer concave mold both slide relative to the ring concave mold. The inner concave mold is used to start molding the prefabricated panel from the center, the ring concave mold is used to complete the annular surface molding of the prefabricated panel, and the outer concave mold is used to finally complete the peripheral surface molding of the prefabricated panel. The molding method comprises: the female mold is pressed toward the male mold in succession at different speeds in different passes, each pass being performed continuously without stopping, with different pressing strokes and speeds, including an initial state, an initial pass molding, an intermediate pass molding, and a final pass molding; The initial state includes: the die and the punch are in place, the prefabricated plate is located between the die and the punch, and has L-shaped cross-sections with evenly distributed and discrete annular cones for positioning and side support, in preparation for molding work; The initial die pressing process includes: the inner concave die pressing down, the ring concave die pressing down at a slightly faster speed, and the outer concave die pressing down at a faster speed, and the respective die pressing speeds are in a preset proportional relationship; The intermediate die pressing includes: the inner die stops pressing when it is in place, the ring die continues pressing at a slightly faster speed, and the outer die continues pressing at a faster speed; The final molding process includes the inner concave mold and the ring concave mold stopping pressing down when they are in place, and the outer concave mold continuing to press down at a slightly faster speed until it stops.

2. The molding method according to claim 1, characterized in that While the die is pressed down, the die and the punch are heated, and the prefabricated panel is heated as well.

3. The molding method according to claim 1, characterized in that The die is driven by hydraulic, pneumatic or electric means.

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