Forming die for guided fire extinguishing bullet cover

Abstract

The utility model belongs to the technical field of composite material forming dies, and relates to an unsaturated polyester bulk molding compound forming die, in particular to a guidance fire extinguishing bullet cover forming die which comprises an upper die and a lower die, the upper die is provided with a cavity, the lower die is provided with a core, and the cavity of the upper die is matched with the core of the lower die to form a plastic part gap. And the shape of the plastic part gap is the same as that of the guidance fire extinguishing bullet cover. According to the forming mold for the guided fire extinguishing bullet cover, the mold pressing technology is adopted, the mold cavity of the upper mold is matched with the mold core of the lower mold to form the plastic part gap, the shape of the plastic part gap is the same as that of the guided fire extinguishing bullet cover, and the problems that the wall thickness of the special-shaped position of a product does not reach the standard and the structure is poor due to the injection molding technology are avoided. And the isotropic rigidities of the product are inconsistent.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite material forming molds, and relates to a forming mold for unsaturated polyester bulk molding material, in particular to a forming mold for a guided fire extinguishing warhead cover. Background Art

[0002] At present, for fire fighting in high-rise buildings, it is difficult for general fire trucks to reach the height of high-rise buildings. In the prior art, drones are used to carry guided fire-extinguishing bombs for fire fighting. The drones bring the guided fire-extinguishing bombs to the same level as the burning high-rise buildings, and launch the guided fire-extinguishing bombs. The guided fire-extinguishing bombs are shot into the fire scene to extinguish the fire.

[0003] For the specific structure of the guided fire-extinguishing warhead hood, please refer to the satellite-guided fire-extinguishing cluster bomb disclosed in patent CN 111380422 A, which is composed of a hood, a foam front shell, a foam middle shell, a foam rear shell and a control cabin shell to form a cavity, and a number of fire-extinguishing bullets are placed in the cavity. A driving device is assembled, so that after the device reaches the sky above the fire point, it will throw fire-extinguishing bullets and sprinkle fire extinguishing agent on the fire point from the air.

[0004] The guided fire-extinguishing warhead cover is a key structural component for the missile to achieve wave transmission, heat protection and load-bearing. It is generally formed using unsaturated polyester bulk molding compound. Unsaturated polyester bulk molding compound, also known as BMC, is a semi-dry method for manufacturing glass fiber reinforced thermosetting products. It is pre-mixed into a paste with unsaturated polyester resin, low shrinkage / low profile additives, initiators, internal release agents, mineral fillers, etc., and then thickeners, colorants, etc. are added. It is stirred with glass fibers of different lengths in a special material kettle for thickening process to finally form a bulk intermediate material.

[0005] The formula of BMC materials can be adjusted according to demand to make it have excellent electrical properties, weather resistance, flame retardancy, insulation and mechanical properties. Moreover, compared with conventional carbon fiber / glass fiber composite materials, BMC materials can significantly reduce costs, so they are widely used in aviation, shipbuilding and construction industries.

[0006] Injection molding is generally used in the market for BMC materials. In the injection molding process, inserts are used to mold the product. The process is simple, the inserts are firm and not easy to rotate after molding, and have good engineering performance. For details, please refer to the BMC material injection molding process disclosed in patent CN 112109273 A, which includes the following steps: before molding, processing of raw materials, cleaning of the injection molding machine barrel, preheating of inserts, and preparation of release agents; when injecting BMC, plastic products are prepared by adding materials, plasticizing, injection, cooling, and demolding.

[0007] The above-mentioned injection molding process can be used for molding large plastic products, but it is not applicable to products with complex shapes or small sizes, especially for the fire-fighting warhead cover of small drones. The space on the top of the hood needs to reserve the installation position of the guided laser head. The wall thickness design of the hood is quite different. The internal shape of the hood is complex. The injection mold is prone to insufficient local feed during injection, resulting in quality defects such as substandard wall thickness at the product's irregular shape, a hollow structure, and inconsistent product stiffness in all directions. Therefore, the existing injection molding process and injection mold are obviously unable to meet the molding requirements of BMC materials for products with complex shapes, small sizes, and high detail requirements. Especially for a series of products with changes in details, the cost of re-molding is high, and the process flow is complicated, which affects product production efficiency. Utility Model Content

[0008] The utility model aims to provide a compression molding die for a guided fire extinguishing warhead cover. The BMC material injection molding process is not applicable to the fire extinguishing warhead cover with a small size and a complex shape.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A molding die for a guided fire extinguishing warhead cover comprises an upper die and a lower die, wherein the upper die is provided with a cavity, and the lower die is provided with a core, the cavity of the upper die cooperates with the core of the lower die to form a plastic part gap, and the shape of the plastic part gap is the same as the shape of the guided fire extinguishing warhead cover.

[0011] Furthermore, the core comprises a hood body molding part and a hood top molding part, the hood top molding part is connected to the lower mold through the hood body molding part; the outer contour of the hood body molding part is the same as the inner surface shape of the guided fire extinguishing warhead hood body, and the outer contour of the hood top molding part is the same as the inner surface shape of the guided fire extinguishing warhead hood guided laser head;

[0012] The inner contour of the cavity is the same as the outer surface shape of the guided fire extinguishing warhead cover body and the guided fire extinguishing warhead cover guided laser head.

[0013] Furthermore, the hood main body molding part and the hood top molding part are detachably connected.

[0014] Furthermore, the hood main body molding part and the hood top molding part are connected by threads or bayonet.

[0015] Furthermore, the head cover main body forming part is detachably connected to the lower mold.

[0016] Furthermore, the head cover main body molding part is connected to the lower mold by a threaded connection or a bayonet connection.

[0017] Furthermore, it also includes a demoulding ring, which is nested at the maximum contour surface of the head cover main body molding part.

[0018] Furthermore, the demoulding ring is connected to the lower mold via a latch structure.

[0019] Furthermore, hanging rings are provided at corresponding positions of the upper die and the lower die.

[0020] Furthermore, the upper mold is connected to the upper mold through a latch structure.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] The utility model provides a molding die for a guided fire extinguishing warhead cover, which adopts a molding process, wherein a cavity of an upper die cooperates with a core of a lower die to form a plastic part gap, and a shape of the plastic part gap is the same as a shape of the guided fire extinguishing warhead cover, thereby avoiding quality defects such as substandard wall thickness at a product's irregularly shaped portion, a hollow structure, and inconsistent product stiffness in all directions caused by an injection molding process, and is suitable for the processing and molding of fire extinguishing warhead covers with smaller sizes and complex shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure assembly of the utility model;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model;

[0025] Figure 3 It is a schematic diagram of the structure of the double-cylinder laser forming part;

[0026] Figure 4 It is a schematic diagram of the structure of the planar laser forming part;

[0027] Among them, 10-upper mold, 11-hanging ring, 12-guide column, 20-lower mold, 21-head cover main body molding part, 22-pin sleeve, 30-head cover top molding part, 31-double cylindrical laser molding part, 32-plane laser molding part, 40-demolding ring, 50-cylindrical pin, 51-screw. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention, but the present invention is not limited to the implementation methods described below.

[0029] Example

[0030] See also Figure 1 and Figure 2The present embodiment provides a molding die for a guided fire extinguishing warhead cover, including an upper die 10 and a lower die 20. The upper die 10 is provided with a cavity, and the lower die 20 is provided with a core. After the upper die 10 and the lower die 20 are molded together, the cavity of the upper die 10 and the core of the lower die 20 cooperate with each other to form a plastic part gap. The shape of the plastic part gap is the same as the shape of the guided fire extinguishing warhead cover.

[0031] Specific:

[0032] The inner contour of the upper mold 10 cavity is the same as the outer surface shape of the guided fire extinguishing warhead cover body and the guided fire extinguishing warhead cover guided laser head.

[0033] The core of the lower mold 20 includes a hood main body molding part 21 and a hood top molding part 30, and the hood top molding part 30 is connected to the lower mold 20 through the hood main body molding part 21; the outer contour of the hood main body molding part 21 is the same as the inner surface shape of the guided fire extinguishing warhead hood body, and the outer contour of the hood top molding part 30 is the same as the inner surface shape of the guided fire extinguishing warhead hood guided laser head that needs to be installed.

[0034] The shape of the top molding portion 30 of the head cover is determined according to the shape of the guided laser head on the top of the guided fire extinguishing warhead cover that needs to be installed in practice. Figure 3 The double cylindrical laser forming part 31 shown in FIG. Figure 4 The planar laser-formed portion 32 is shown.

[0035] In order to facilitate the overall disassembly and assembly of the mold, the top of the hood main body molding part 21 is detachably connected to the hood top molding part 30, and the bottom of the hood main body molding part 21 is detachably connected to the lower mold 20.

[0036] Specifically, in order to make the hood body adapt to guided lasers of different shapes, the hood body forming part 21 and the hood top forming part 30 are provided with mutually matching threads in this embodiment, and the hood body forming part 21 and the hood top forming part 30 are connected by threads, and in practice, they can also be connected by mutually matching bayonet joints. Different hood top forming parts 30 can be replaced according to the shape of the guided laser.

[0037] In order to process head cover bodies of different shapes or sizes, in this embodiment, the head cover body forming part 21 and the lower mold 20 are provided with mutually matching threads, and the head cover body forming part 21 and the lower mold 20 are connected by threads, and in practice, they can also be connected by mutually matching bayonet joints. The head cover body forming part 21 can be replaced according to the shape or size of the head cover body.

[0038] In order to facilitate the closing of the upper mold 10 and the lower mold 20, a guide post 12 is set at the bottom end of the upper mold 10, and a pin sleeve 22 is set at the top end of the lower mold 20. The guide post 12 can be inserted into the pin sleeve 22. When the upper mold 10 and the lower mold 20 are closed, the guide post 12 cooperates with the pin sleeve 22 to perform positioning and connection.

[0039] In order to facilitate the lifting of the entire mold for molding processing after mold closing, lifting rings 11 are provided at relative positions between the upper mold 10 and the lower mold 20.

[0040] For further optimization, in order to facilitate demoulding, this embodiment also provides a demoulding ring 40. When the mold is closed, the demoulding ring 40 is nested on the maximum contour surface of the head cover body molding part 21. Specifically, the demoulding ring 40 is provided with a positioning pin hole and a threaded hole relative to the lower mold 20. The demoulding ring 40 and the lower mold 20 are positioned by inserting a cylindrical pin 50 into the positioning pin hole. The screw 51 passes through the threaded holes on the lower mold 20 and the demoulding ring 40 from bottom to top to connect the demoulding ring 40 with the lower mold 20. When demoulding, the cylindrical pin 50 and the screw 51 are removed, and then the demoulding ring 40 is removed from the guided fire extinguishing warhead cover product, so as to facilitate the subsequent separation between the upper and lower molds and the guided fire extinguishing warhead cover product.

[0041] The mold assembly of this embodiment is as follows Figure 1 As shown, the upper die 10 and the lower die 20 are made of the same material, both of which are Q235 ordinary carbon structural steel (also known as A3 steel), the guide column 12 and the pin sleeve 22 are made of 45# steel, the lifting ring 11 is a standard lifting ring of M8, and the screw 51 and the cylindrical pin 50 are all national standard parts.

[0042] The present embodiment is a molding die for a guided fire extinguishing warhead cover, and its working principle is as follows:

[0043] Unsaturated polyester resin, low shrinkage / low profile additives, initiators, internal release agents, mineral fillers, etc. are pre-mixed into a paste, and thickeners, colorants, etc. are added. They are stirred with glass fibers of different lengths in a special material kettle for thickening, and finally form a mass BMC material that can be used for molding process.

[0044] Step 1: Lower mold assembly

[0045] First, according to the shape and size of the guided fire extinguishing warhead hood, select the appropriate hood main body molding part 21 and the hood top molding part 30; then, connect and fix the hood main body molding part 21 to the lower mold 20; then, put the demolding ring 40 on the hood main body molding part 21, use the cylindrical pin 50 to position it, and use the screw 51 to fix the demolding ring 40 to the lower mold 20; finally, connect and fix the hood top molding part 30 to the hood main body molding part 21 as an insert to complete the assembly.

[0046] Step 2: Filling the lower mold

[0047] According to design requirements, a certain amount of bulk molding compound is placed on the core of the lower mold 20 so that the bulk molding compound can cover the entire cavity.

[0048] Step 3: Upper and lower molds

[0049] The lifting rings 11 are fixed to the relative positions of the upper mold 10 and the lower mold 20 respectively, and the guide pillars 12 and the pin sleeves 22 are equipped, and the upper mold 10 and the lower mold 20 are clamped by lifting.

[0050] Step 4: Curing and forming

[0051] The molding process is carried out according to the process requirements to complete the curing and molding of the product.

[0052] Step 5: Product demoulding

[0053] The mold is removed from the molding equipment, and the upper mold 10 is lifted by a crane to complete the demoulding of the upper mold 10 and the lower mold 20. Then, the screws 51 on the demoulding ring 40 are removed, and the demoulding ring 40 is lifted from the lower mold 20. The guided fire extinguishing warhead cover product is demoulded as the demoulding ring 40 is separated.

[0054] The utility model provides a compression molding die for a guided fire extinguishing warhead cover, which adopts a compression molding process, is simple to assemble, and has a compact overall structure. The cavity of an upper mold cooperates with the core of a lower mold to form a plastic part gap, and the shape of the plastic part gap is the same as the shape of the guided fire extinguishing warhead cover. This avoids quality defects such as substandard wall thickness at a product's irregularly shaped portion, a hollow structure, and inconsistent product stiffness in all directions that may occur when an injection molding process is used, and is suitable for the processing and molding of fire extinguishing warhead covers that are small in size and complex in shape.

[0055] Furthermore, in response to a series of changes in the appearance of BMC material products, combined with the inserts in the BMC injection molding process, that is, a hood main body molding part and a hood top molding part matching different hood products are set in the mold cavity. The hood main body molding part and the hood top molding part are used as inserts and are only disassembled and replaced when the shape or size of the product changes, thereby avoiding the need to re-open the mold when processing a series of products with changes in details, reducing processing costs, simplifying and quickly operating, and improving product production efficiency.

Claims

1. A molding die for a guided fire extinguishing warhead cover, Features: The invention comprises an upper mold (10) and a lower mold (20), wherein the upper mold (10) is provided with a mold cavity, and the lower mold (20) is provided with a mold core, and the mold cavity of the upper mold (10) and the mold core of the lower mold (20) cooperate to form a plastic part gap, and the shape of the plastic part gap is the same as the shape of the guided fire extinguishing warhead cover.

2. A molding die for a guided fire extinguishing warhead cover according to claim 1, Features: The core comprises a hood body molding part (21) and a hood top molding part (30), wherein the hood top molding part (30) is connected to the lower mold (20) via the hood body molding part (21); the outer contour of the hood body molding part (21) is the same as the inner surface shape of the guided fire extinguishing warhead hood body, and the outer contour of the hood top molding part (30) is the same as the inner surface shape of the guided laser head at the top of the guided fire extinguishing warhead hood; The inner contour of the cavity is the same as the outer surface shape of the guided fire extinguishing warhead cover body and the guided laser head.

3. A molding die for a guided fire extinguishing warhead cover according to claim 2, Features: The hood body molding part (21) and the hood top molding part (30) are detachably connected.

4. A molding die for a guided fire extinguishing warhead cover according to claim 3, Features: The hood body molding part (21) and the hood top molding part (30) are connected by threads or bayonet.

5. A molding die for a guided fire extinguishing warhead cover according to claim 2, Features: The head cover main body molding part (21) is detachably connected to the lower mold (20).

6. A molding die for a guided fire extinguishing warhead cover according to claim 5, Features: The head cover main body molding part (21) is connected to the lower mold (20) through a threaded connection or a bayonet connection.

7. A molding die for a guided fire extinguishing warhead cover according to any one of claims 2 to 6, Features: It also comprises a demoulding ring (40), wherein the demoulding ring (40) is nested at the maximum contour surface of the head cover main body molding part (21).

8. A molding die for a guided fire extinguishing warhead cover according to claim 7, Features: The demoulding ring (40) is connected to the lower mold (20) via a latch structure.

9. The molding die for the guided fire extinguishing warhead cover according to claim 1, Features: The upper die (10) is provided with a lifting ring (11), and the lower die (20) is provided with a lifting ring (11) at a corresponding position.

10. A molding die for a guided fire extinguishing warhead cover according to claim 9, Features: The upper mold (10) and the lower mold (20) are connected via a latch structure.

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