A mold for molding near-composite material structural shells with large openings

Abstract

This utility model discloses a mold for forming a near-composite material structure shell with a large opening, belonging to the field of composite material rotating component forming. It includes a mandrel, a skirt positioning block, a process end cap, a locking nut, a skirt hole pin, a large opening hole pin, and a metal ring positioning block. This utility model achieves shell positioning at the skirt portion and skirt connection hole forming through the annular groove, through-hole, and skirt hole pin of the skirt positioning block; and achieves shell positioning at the large opening portion through the threaded through-hole at the front end and the through-hole at the rear end of the metal ring positioning block, the large opening hole pin, and the annular groove between the metal ring positioning block and the process end cap. This metal ring positioning and large opening connection hole forming effectively achieve shell positioning and solve the problems of complex, inefficient, and inconsistent machining processes for connection holes. Furthermore, this utility model also has advantages such as strong design flexibility, high assembly precision, convenient disassembly after shell forming, and simple operation.

Description

Technical Field

[0001] This utility model belongs to the field of composite material rotating body component molding, and specifically relates to a mold for molding a near-composite material structure shell with a large opening. Background Technology

[0002] As the requirements for range, power, accuracy and mobility of missile and rocket weapon systems continue to increase, the use of lightweight, high-strength advanced resin-based composite materials as load-bearing structural components to replace metal materials and reduce the negative weight of the entire projectile has become a research focus. Solid rocket motors are an important component of missile and rocket weapon systems, accounting for a large proportion of the mass of the entire projectile (about 2 / 3). The motor casing itself is the negative mass of the motor, and the need for lightweighting is urgent.

[0003] With the increasing demands for intelligentization, the number and size of working units connected to the engine housing are growing. Traditional end-retractable engine housings no longer meet the requirements, leading to the development of large-opening engine housings. Large-opening engine housings not only allow for the assembly of the housing with large-volume working components but also enable the free loading of solid propellant, improving engine production efficiency and saving costs. Furthermore, they avoid problems such as porosity, cracks, inclusions, and debonding caused by casting and molding of propellant, ensuring the reliability of engine operation and solving the drawbacks of traditional propellant loading methods and the high cost of composite material engine housings with propellant winding.

[0004] Currently, the joints and connecting skirts at both ends of commonly used large-aperture composite engine casings are made of metal. These large-aperture joints and skirts are larger in size and have a much higher density than composite materials, resulting in greater weight. This affects the weight reduction efficiency of the casing, especially for "short and thick" large-aperture casings, where the weight reduction efficiency is significantly reduced. Furthermore, large-aperture metal joints require the machining of "barbs" for axial connection, which has a long processing cycle and high processing costs, severely reducing the cost-effectiveness of composite material casings. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a mold for molding a near-composite material structure engine housing with a large opening.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: The mold adopts a split structure, the main body of which includes a mandrel, a metal ring positioning block, a process end cap, and a skirt positioning block. Mold locking and positioning are achieved through steps on the mandrel, a positioning platform between the mandrel and the metal ring positioning block, a positioning platform between the metal ring positioning block and the process end cap, and a locking nut. The mandrel steps, threaded structure, and radial threaded through-holes in the metal ring positioning block are used to position the front connector of the housing and the metal ring. The connecting holes at the large opening of the housing and the skirt are formed by radially connected pins between the metal ring positioning block and the skirt positioning block. After the housing is cured, removing the pins yields the connecting holes, solving the problems of low machining efficiency and poor quality consistency. The large opening end and the skirt end of the housing are positioned by the annular groove between the metal ring positioning block and the process end cap, and the annular groove above the skirt positioning block, respectively, thus achieving the purpose of this utility model.

[0007] This utility model relates to a mold for molding a near-composite material structure shell with a large opening, including a mandrel, a skirt positioning block, a process end cap, a locking nut, a skirt hole pin, a large opening hole pin, and a metal ring positioning block. The mandrel has positioning steps on both sides and a core mold in the middle, forming a rotating body structure. Its left end consists of an inner flat plate structure and an outer arc-shaped structure. The flat plate structure is at the same height as the right straight end face of the front connector, and the arc-shaped structure matches the arc shape of the front connector. The skirt positioning block, metal ring positioning block, and process end cap are all rotating body structures with a central hole matching the mandrel. An annular groove is provided on the outer surface of the skirt positioning block for positioning the end of the shell skirt. A radially opening through hole is provided on the right side of the annular groove, corresponding to the skirt hole pin. The connection is used for the connecting hole of the skirt part of the molded shell; the left side of the metal ring positioning block is provided with a radially opened threaded through hole for placing the bolt for fixing the metal ring; the middle position is provided with a radially opened through hole of the metal ring positioning block, which is connected to the large opening pin for connecting the large opening part of the molded shell; the skirt positioning block is sleeved on the left side of the mandrel, and the two are fixedly connected by the locking nut and the positioning step of the mandrel; the metal ring positioning block is sleeved on the mandrel and the right side of the core mold, the process end is sleeved on the mandrel and the right side of the metal ring positioning block, the left end of the metal ring positioning block is positioned by the positioning structure with the core mold, and the right end is positioned by the positioning structure with the process end, and the process end is fixedly connected by the locking nut and the positioning step of the right side shaft of the mandrel.

[0008] Preferably, the core mold has a hollow structure.

[0009] Preferably, the left end of the metal ring positioning block is provided with a matching positioning structure to the right end of the core mold, and the right end is provided with a matching positioning structure to the left end of the process head.

[0010] More preferably, the matching positioning structure provided at the left end of the metal ring positioning block and the right end of the core mold is an annular concave platform at the left end of the metal ring positioning block and an annular protrusion at the right end of the core mold.

[0011] More preferably, the matching positioning structure provided at the right end of the metal ring positioning block and the left end of the process head is an annular boss at the right end of the metal ring positioning block and an annular recess at the left end of the process head.

[0012] More preferably, in the length direction, the annular recess at the left end of the process head is larger than the annular boss at the right end of the metal ring positioning block. When the two are matched and combined, they form an annular groove, which is used to determine the position of the large opening end of the shell.

[0013] Preferably, the metal ring positioning block has a fan-shaped through hole in the thickness direction to reduce the weight of the metal ring positioning block.

[0014] Preferably, both the skirt pin and the large opening pin are composed of two parts: the upper part is a cylindrical structure and the lower part is a conical structure, which can prevent them from falling off after being installed into the hole and facilitate removal from the inside during demolding.

[0015] This utility model relates to a mold for forming a near-composite material structure shell with a large opening. The shell is positioned in the skirt area and the skirt connecting hole is formed through the annular groove, through hole, and skirt pin of the skirt positioning block. The shell is positioned in the large opening area through the threaded through hole at the front end of the metal ring positioning block, the through hole at the rear end, the large opening pin, and the annular groove between the metal ring positioning block and the process head. The metal ring positioning and the forming of the connecting hole in the large opening area effectively achieve shell positioning and solve the problems of complex machining processes, low efficiency, and poor consistency in connecting hole machining. Furthermore, this utility model has advantages such as strong design flexibility, high assembly precision, convenient disassembly after shell forming, and simple operation. Attached Figure Description

[0016] Figure 1 A schematic diagram of a mold structure for forming a near-composite material shell with a large opening;

[0017] Figure 2 Sectional view of the mold mandrel

[0018] Figure 3 A half-sectional view of the mold skirt positioning block;

[0019] Figure 4 This is a front view of the mold metal ring positioning block;

[0020] Figure 5 A half-sectional view of the mold metal ring positioning block;

[0021] Figure 6 This is a sectional view of the mold process head.

[0022] Wherein 1 is the mandrel, 1-1 is the core mold; 2 is the skirt positioning block locking nut; 3 is the skirt positioning block, 3-1 is the skirt positioning block annular groove, 3-2 is the skirt positioning block through hole; 4 is the skirt hole pin; 5 is the front connector locking nut; 6 is the front connector; 7 is the metal ring; 8 is the metal ring fixing nut; 9 is the large opening hole pin; 10 is the metal ring positioning block, 10-1 is the threaded through hole, 10-2 is the metal ring positioning block through hole; 11 is the process end cap; 12 is the process end cap locking nut; 13 is the annular boss; 14 is the annular recess. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the technical solution of the present invention is not limited to the specific embodiments listed below.

[0024] The near-composite material structure shell of this utility model refers to a shell that retains only the front connector located at the end cap and the metal ring at the large opening end for sealing, while the rest of the shell is made of composite material.

[0025] like Figures 1-6 As shown, the present invention is used for winding molding of near-composite material structure shell with large opening, including mandrel 1, skirt positioning block 3, skirt hole pin 4, large opening hole pin 9, metal ring positioning block 10, process end cap 11 and locking nut.

[0026] Two positioning steps are provided on the left side of the mandrel 1, for axial positioning of the skirt positioning block 3 and the front connector 6, respectively. One positioning step is provided on the right side of the mandrel 1 for positioning the process end cap 11. A core mold 1-1 is located in the middle, designed as a hollow rotating structure to reduce weight. The inner left side of the core mold 1-1 is a flat plate, with its height matching the height of the straight right end face of the front connector 6; the outer side is an arc-shaped structure, matching the arc shape of the front connector 6, such as... Figure 1 As shown. The right end is a flat plate structure with an outwardly extending annular boss 13 on the outer side, used to mate with the annular recess 14 on the left side of the metal ring positioning block 10. Figure 2 As shown.

[0027] The skirt positioning block 3 is a rotating structure used to hang the longitudinal fibers when they are wound and turned in the skirt section. Its central hole matches the mandrel 1. An annular groove 3-1 is provided on the outer surface of the skirt positioning block to position the end of the shell skirt. To the right of the annular groove 3-1, 12 radially distributed through holes 3-2 are provided for the skirt positioning block, which connect to the skirt hole pin 4 to form the connecting holes in the shell skirt section. Figure 3 As shown.

[0028] Both the skirt pin 4 and the large opening pin 9 consist of two parts: a cylindrical structure on top and a conical structure on the bottom. This prevents them from falling off after being installed into the hole and makes it easy to remove them from the inside during demolding.

[0029] The metal ring positioning block 10 is a rotating structure, with its central hole matching the mandrel 1. It has an annular recess 14 at its left end and an annular boss 13 at its right end, for connection with the annular recess 14 at the left end of the process head 11. Eight radially spaced threaded through holes 10-1 are evenly distributed around the left side for placing bolts to fix the metal ring 7. Thirty radially spaced through holes 10-2 are evenly distributed around the center, connecting to the large-opening pin 9 for connecting the large opening portion of the molded shell. To achieve weight reduction, the metal ring positioning block 10 has four fan-shaped through holes along its thickness direction, such as... Figures 4-5 As shown.

[0030] The process end cap 11 is a rotating structure used to hang the longitudinal fibers when they are wound and turned in the large opening. Its central hole matches the mandrel 1, and an annular recess 14 is provided at the left end. In the radial direction, it matches the annular boss 13 at the right end of the metal ring positioning block 10. In the length direction, it is larger than the annular boss 13 at the right end of the metal ring positioning block 10. Figure 6 As shown.

[0031] The locking nuts include skirt positioning block locking nut 2, front connector locking nut 5, metal ring fixing nut 8, and process end cap locking nut 12.

[0032] This utility model is used for a winding molding die for a near-composite material structure shell with a large opening. A skirt positioning block 3 is sleeved on the left side of the mandrel 1, and the two are fixedly connected by the skirt positioning block locking nut 2 and the positioning step on the left side of the mandrel 1. A front connector 6 is sleeved on the left side of the core mold 1-1 in the middle of the mandrel 1, and is fixedly connected to the mandrel 1 by the front connector locking nut 5 and the core mold (1-1). A metal ring positioning block 10 is sleeved on the mandrel 1 and the right side of the core mold 1-1, with its left end face contacting the right end face of the core mold 1-1. The left annular recess 14 is sleeved inside the right annular boss 13 of the core mold 1-1, using process... The annular recess 14 at the left end of the end cap 11 is positioned and fixedly connected to the mandrel 1 by the process end cap locking nut 12; the metal ring 7 is sleeved on the metal ring positioning block 10, and the two are fixedly connected by eight metal ring fixing nuts 8 through threaded holes 101; the process end cap 11 is sleeved on the mandrel 1 and the right side of the metal ring positioning block 10, and the annular recess 14 on its left side matches and connects with the annular boss 13 on the right side of the metal ring positioning block 10 to form an annular groove, which is used to determine the position of the large opening end of the shell; the right end is fixedly connected to the positioning step of the right side shaft of the mandrel 1 by means of the process end cap locking nut 12. There are 12 skirt hole pins 4, which are set in the through hole 32 of the skirt positioning block; there are 30 large opening hole pins 9, which are set in the through hole 102 of the metal ring positioning block.

[0033] When forming the shell using the mold of this utility model, the steps are as follows:

[0034] 1. Install the front connector 6 onto the spindle 1 and tighten it using the front connector locking nut 5. Install the metal ring 7 onto the metal ring positioning block 10, and fix the metal ring 7 by installing the metal ring fixing nut 8 through the threaded through hole from the inside of the positioning block.

[0035] 2. Install the large opening pin 9 onto the through hole of the metal ring positioning block 10, then install the metal ring positioning block 10 onto the mandrel 1, install the process end cap 11 onto the mandrel 1, and lock the metal ring positioning block 10 and the process end cap 11 with the process end cap locking nut 12.

[0036] 3. After the front connector 6 of the housing is wound into place at the large opening, install the skirt pin 4 into the through hole of the skirt positioning block 3, then install the skirt positioning block 3 into the mandrel 1, and lock it with the skirt positioning block locking nut 2 to form the housing skirt to the large opening.

[0037] 4. After the shell is cured, remove the fiber above the annular groove at the large opening of the shell and the annular groove at the skirt by machining. First, remove the skirt positioning block locking nut 2 and the process end cap locking nut 12, then remove the skirt positioning block 3, the process end cap 11 and the metal ring positioning block 10 to achieve demolding.

Claims

1. A mold for molding a near-composite material structure shell with a large opening, comprising a mandrel, a skirt positioning block, a process end cap, and a locking nut, characterized in that: It also includes a skirt pin (4), a large opening pin (9), and a metal ring positioning block (10); the mandrel (1) is provided with positioning steps on both sides and a core mold (1-1) in the middle, a rotating body structure, the left end of which is composed of an inner flat structure and an outer arc structure, the flat structure is consistent with the height of the right straight end face of the front connector (6), and the arc structure matches the arc shape of the front connector (6); the skirt positioning block (3), the metal ring positioning block (10), and the process end cap (11) are all rotating body structures with a center hole matching the mandrel (1); the outer surface of the skirt positioning block (3) is provided with a skirt positioning block annular groove (3-1) for positioning the end position of the shell skirt; on the right side of the skirt positioning block annular groove (3-1), a skirt positioning block through hole (3-2) is provided radially and connected to the skirt pin (4) for forming the connecting hole of the shell skirt part; the left side of the metal ring positioning block (10) is provided with a circumferentially arranged A radially threaded through hole (10-1) is used to place the bolt for fixing the metal ring (7); a radially oriented metal ring positioning block through hole (10-2) is provided in the middle position and connected to the large opening pin (9) for forming the large opening part of the shell connection hole; the skirt positioning block (3) is sleeved on the left side of the mandrel (1) and the two are fixedly connected by the locking nut and the positioning step of the mandrel (1); the metal ring positioning block (10) is sleeved on the mandrel (1) and the right side of the core mold (1-1), and the process end cap (11) is sleeved on the mandrel (1) and the right side of the metal ring positioning block (10). The left end of the metal ring positioning block (10) is positioned by the positioning structure with the core mold (1-1), and the right end is positioned by the positioning structure with the process end cap (11). The process end cap (11) is fixedly connected by the locking nut and the positioning step of the right side shaft of the mandrel (1).

2. A mold for forming a large open near net composite structure shell according to claim 1, wherein: The core mold (1-1) has a hollow structure.

3. The mold for forming a large open near net composite structure shell according to claim 1, wherein: The left end of the metal ring positioning block (10) is provided with a matching positioning structure to the right end of the core mold (1-1), and the right end is provided with a matching positioning structure to the left end of the process head (11).

4. The mold for forming a large open near-net composite structure shell according to claim 3, wherein: The matching positioning structure set at the left end of the metal ring positioning block (10) and the right end of the core mold (1-1) is an annular recess (14) at the left end of the metal ring positioning block (10) and an annular boss (13) at the right end of the core mold (1-1).

5. The mold for molding a near-composite material structure shell with a large opening according to claim 3, characterized in that: The matching positioning structure set at the right end of the metal ring positioning block (10) and the left end of the process head (11) is an annular boss (13) at the right end of the metal ring positioning block (10) and an annular recess (14) at the left end of the process head (11).

6. A mold for forming a large open near net composite structure shell according to claim 5, wherein: In the length direction, the annular recess (14) at the left end of the process head (11) is larger than the annular boss (13) at the right end of the metal ring positioning block (10). When the two are matched and combined, an annular groove is formed.

7. The mold for forming a large open near net composite structure shell according to claim 1, wherein: The metal ring positioning block (10) has a fan-shaped through hole in the thickness direction.

8. The mold for forming a large open near net composite structure shell according to claim 1, wherein: Both the skirt pin (4) and the large opening pin (9) consist of two parts: the upper part is a cylindrical structure and the lower part is a conical structure.

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