A one-step splicing forming mold for curved honeycomb core

Abstract

The present invention discloses a one-time splicing forming mold for a curved honeycomb core, comprising a base frame, a plurality of lower supporting columns are provided at intervals on both sides of the top surface of the base frame, and local splints are correspondingly connected between the lower supporting columns, the local splints comprise relatively arranged lower supporting plates and upper pressure plates, the lower supporting plates are connected to the top of the lower supporting columns, an upper pressure plate column is provided on the outer side of the lower supporting columns, the upper pressure plate comprises two pressure plates butted against each other, and the ends of the pressure plates away from each other are hinged to the top of the upper pressure plate column. Positioning blocks and local splints are added to the mold of the present invention to ensure accurate positioning of the core, and mechanical pressure is applied to the joints by the splints with profiles, so that the foam glue and the core will not be displaced during the curing process. After curing, the core is shaped consistent with the tooling profile, eliminating the need for vacuuming the entire bag each time, saving bag making materials, simplifying the operation, and saving working time.

Description

Technical Field

[0001] The present invention relates to the field of honeycomb core splicing, and in particular to a one-time splicing molding die for curved honeycomb cores. Background Art

[0002] Since composite sandwich structures have the advantages of light weight, high specific strength and stiffness, fatigue resistance, sound absorption and noise reduction, and heat insulation, they meet the needs of modern aircraft to further reduce weight and reduce fuel consumption while pursuing improved performance; current advanced civil aircraft have successfully applied honeycomb sandwich structures to primary and secondary force structures such as elevators, rudders, engine fairings, fuselage wing fairings, and wings; in order to meet the requirements of aerodynamic surfaces, many parts have complex surfaces and large deformations, and are often made of over-stretched honeycomb core materials.

[0003] Due to the anisotropic properties of overstretched honeycomb cores, they bend easily perpendicular to the core strips but not along them. Therefore, complex parts must be cut along the core strips, then spliced ​​with foam adhesive and cured to set the shape. The core segments must be rough-cut with allowances, assembled on the fixture, and then trimmed to size. This results in material waste, multiple processing steps, and long cycle times. Furthermore, due to inaccurate positioning and repeated deviations, the joint quality is unstable. The larger the curve, the more variations in the profile, and the more likely the joints will develop defects such as dents and cavities after molding.

[0004] For many years, the production of curved honeycomb core parts in the domestic and international industries usually requires the production of larger tooling; rough cutting is required, leaving a margin of more than 30mm around the perimeter; rough chamfering is required to facilitate bag making; foam glue is used to splice on the molding tooling, vacuum bags are made, and then heated to a specific temperature to solidify the shape. After that, it is placed on the core cutting template and fine-cut to the net size, and then the final chamfering is completed. This method results in excessively heavy tooling and high production costs; the production of honeycomb parts requires many steps and long working hours; the consumption of raw and auxiliary materials is large; and the quality of the parts cannot be stable. Summary of the Invention

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is: a one-time splicing molding mold for a curved honeycomb core, comprising a base frame, a plurality of lower support columns are spaced apart on both sides of the top surface of the base frame, and local splints are correspondingly connected between the lower support columns, and the local splints include relatively arranged lower support plates and upper pressure plates, the lower support plates are connected to the tops of the lower support columns, and upper pressure plate columns are provided on the outsides of the lower support columns, and the upper pressure plate includes two pressure plates connected to each other, and the ends of the pressure plates away from each other are hinged to the tops of the upper pressure plate columns.

[0006] Furthermore, one end of the pressure plates that are butted against each other is provided with an L-shaped butt joint groove, and the L-shaped butt joint groove is connected by a positioning pin.

[0007] Furthermore, an elastic EPDM rubber pad is pasted on the inner side of the pressing plate.

[0008] Furthermore, the width of the upper pressing plate is 200-250 mm, the width of the lower supporting plate is 200-250 mm, and the width of the lower supporting plate is not less than the width of the corresponding upper pressing plate.

[0009] Furthermore, positioning blocks are provided at the tops of both ends of the lower support plate.

[0010] Furthermore, the upper pressing plate and the lower supporting plate are both curved surfaces adapted to the curvature of the honeycomb core.

[0011] Furthermore, the base frame includes an upper base frame and a lower base frame arranged in parallel, and a connecting column connecting the upper base frame and the lower base frame, and a forklift slot is provided between the upper base frame and the lower base frame.

[0012] Furthermore, a support column connected to the base frame is provided at the bottom of the lowest end of the lower support plate.

[0013] Furthermore, the splicing process includes the following steps:

[0014] (1) Prepare the core material to be spliced ​​according to the determined shape and size. It can be cut by hand using a template or cut by a machine according to the program;

[0015] (2) Open the upper platen of the mold and place the first core on the tooling with the help of the lower support plate and the upper platen column;

[0016] (3) Lay out other core blocks in sequence and check the core size and position;

[0017] (4) Use foam glue to splice the divided cores in sequence, and place self-made semi-flexible pressure pads and isolation films above and below the splicing area to prevent the bonding surface from being contaminated and facilitate subsequent paving operations;

[0018] (5) Lower the upper pressure plate and secure it with the positioning pins to ensure that the pressure plate presses the core tightly;

[0019] (6) Place the entire mold into an oven for heating and curing.

[0020] After adopting the above structure, the present invention has the following advantages:

[0021] The present invention provides a low-cost, easy-to-operate mold and method for completing the splicing and molding of large curved honeycomb cores in one step, which has the following advantages over the existing technology:

[0022] 1. Ability to accurately divide the shape and size of core blocks according to product requirements and core characteristics;

[0023] 2. Accurately cut materials according to the final size requirements without adding extra allowance, saving the use of raw materials, eliminating the steps of rough cutting and rough chamfering, saving labor hours and shortening the cycle;

[0024] 3. Positioning blocks and localized splints are added to the mold to ensure accurate core positioning. Mechanical pressure is applied to the joints via the molded splints, preventing displacement of the foam adhesive and the core during the curing process. After curing, the core is shaped to conform to the molded surface. The joints are small, the surface is smooth, and there is no excess adhesive.

[0025] 4. It eliminates the need for vacuuming each time, which saves bag making materials, simplifies operations, and saves working hours.

[0026] 5. Reasonable division of the core splicing and molding area and the area where no operation is required greatly simplifies the tooling structure, reduces the difficulty of tooling production, and saves tooling costs.

[0027] 6. Accurate positioning and precise pressure ensure that the large curved honeycomb core is spliced ​​and formed in one time with stable quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a structural schematic diagram of a one-time splicing molding die for a curved honeycomb core according to the present invention.

[0030] Figure 2 It is a schematic diagram of the bottom structure of a one-time splicing molding die for a curved honeycomb core according to the present invention.

[0031] Figure 3 It is a schematic diagram of the top structure of a one-time splicing molding die for a curved honeycomb core according to the present invention.

[0032] Figure 4 It is a schematic diagram of the open structure of a one-time splicing molding die for a curved honeycomb core according to the present invention.

[0033] Figure 5 The diagram is a schematic diagram of the split structure of an upper pressing plate in a one-step splicing molding die for a curved honeycomb core according to the present invention.

[0034] As shown in the figure: 1. Base frame, 1.1. Lower support column, 1.2. Upper pressure plate column, 1.3. Upper base frame, 1.4. Lower base frame, 1.5. Connecting column, 1.6. Support column, 2. Lower support plate, 3. Upper pressure plate, 3.1. Pressure plate, 3.2. L-shaped docking groove, 3.3. Locating pin, 4. Elastic EPDM rubber pad, 5. Positioning block, 6. Forklift slot hole. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0039] Furthermore, the use of terms such as "horizontal," "vertical," and "overhanging" does not necessarily imply that the component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0040] In the description of the embodiments of the present invention, "a plurality of" means at least two.

[0041] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] Example

[0043] A one-time splicing molding mold for a curved honeycomb core includes a base frame 1, and several lower support columns 1.1 are spaced apart on both sides of the top surface of the base frame 1. Local splints are correspondingly connected between the lower support columns 1.1. The local splints include relatively arranged lower support plates 2 and upper pressure plates 3. The lower support plates 2 are connected to the tops of the lower support columns 1.1, and upper pressure plate columns 1.2 are provided on the outsides of the lower support columns 1.1. The upper pressure plate 3 includes two pressure plates 3.1 butted against each other, and the ends of the pressure plates 3.1 away from each other are hinged to the tops of the upper pressure plate columns 1.2.

[0044] As a preferred implementation scheme of this embodiment, one end of the pressure plates 3.1 that are connected to each other is provided with an L-shaped docking groove 3.2, and the L-shaped docking groove 3.2 is connected by a positioning pin 3.3.

[0045] As a preferred implementation scheme of this embodiment, an elastic EPDM rubber pad 4 is pasted on the inner side of the pressing plate 3.1.

[0046] As a preferred implementation scheme of this embodiment, the width of the upper pressing plate 3 is 200-250 mm, the width of the lower supporting plate 2 is 200-250 mm, and the width of the lower supporting plate 2 is not less than the width of the corresponding upper pressing plate 3.

[0047] As a preferred implementation scheme of this embodiment, positioning blocks 5 are further provided at the top of both ends of the lower support plate 2.

[0048] As a preferred implementation scheme of this embodiment, the upper pressing plate 3 and the lower supporting plate 2 are both curved surfaces adapted to the curvature of the honeycomb core.

[0049] As a preferred implementation scheme of this embodiment, the base frame includes an upper base frame 1.3 and a lower base frame 1.4 arranged in parallel, and a connecting column 1.5 connecting the upper base frame 1.3 and the lower base frame 1.4, and a forklift slot 6 is provided between the upper base frame 1.3 and the lower base frame 1.4.

[0050] As a preferred implementation scheme of this embodiment, a support column 1.6 connected to the base frame 1 is provided at the bottom of the lowest end of the lower support plate 2.

[0051] In the present invention, the base frame is welded from square steel to connect and stabilize the mold body; the base frame must meet the overall structural requirements, reserve installation positions for the lower support plate and the upper pressure plate, and add a forklift slot in the middle to facilitate back and forth transportation;

[0052] Typically, the gap between cores is less than 2mm. The lower support plate is made up of a series of 200-250mm wide aluminum plates, fixedly mounted on the base frame. The side that contacts the core is CNC-machined to ensure that its profile meets the requirements of the final part. The reverse side is the non-operating surface, and excess material is removed according to the curved surface structure before installation. Positioning blocks are fixed around the lower support plate to ensure that the core can be placed in the correct position every time. The positioning blocks are fixed around the lower support plate and are processed together with the lower support plate according to the final shape requirements of the core.

[0053] The upper platen is also composed of a series of 200-250mm wide aluminum plates, hinged to the base frame. The side in contact with the core is CNC-machined, and the theoretical profile is offset 3mm upward from the upper surface of the formed core. During installation, the gap between the upper platen and the core can be adjusted using highly elastic rubber pads. To reduce the difficulty of CNC machining and facilitate subsequent operations, each upper platen is processed in two sections. When splicing the core, the plates are opened to both sides. After the core and foam glue are positioned, the upper platen is pressed down against the core and connected and fixed with locating pins to ensure that the two sections of the upper platen are pressed down in place and the core and foam glue are tightened and constrained. A gap of about 3mm is left between the upper platen and the core. A highly elastic EPDM rubber pad can be attached to the upper platen to fill the gap between the upper platen and the core, helping the upper platen to fully compress and constrain the core, and to protect the core surface.

[0054] The present invention also discloses a splicing process, which comprises the following steps:

[0055] (1) Prepare the core material to be spliced ​​according to the determined shape and size. It can be cut by hand using a template or cut by a machine according to the program;

[0056] (2) Open the upper platen of the mold and place the first core on the tooling with the help of the lower support plate 2 and the positioning block 5;

[0057] (3) Lay out other core blocks in sequence and check the core size and position;

[0058] (4) Use foam glue to splice the divided cores in sequence, and place self-made semi-flexible pressure pads and isolation films above and below the splicing area to prevent the bonding surface from being contaminated and facilitate subsequent paving operations;

[0059] (5) Lower the upper pressing plate 3 and secure it with the positioning pins 3.3 to ensure that the pressing plate presses the core tightly;

[0060] (6) Place the entire mold into an oven for heating and curing.

[0061] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A curved honeycomb core one-step splicing forming mold, characterized in that: The base frame comprises a plurality of lower support columns spaced apart on both sides of the top surface of the base frame, local plywood is correspondingly connected between the lower support columns, the local plywood comprises a lower support plate and an upper pressure plate which are relatively arranged, the lower support plate is connected to the top of the lower support column, an upper pressure plate column is provided on the outer side of the lower support column, the upper pressure plate comprises two pressure plates butted against each other, and one end of the pressure plates away from each other is hinged to the top of the upper pressure plate column; An L-shaped butt joint groove is provided at one end of the pressure plates butting against each other, and the L-shaped butt joint groove is connected by a positioning pin; Positioning blocks are also provided on the tops of both ends of the lower support plate; The upper pressing plate and the lower supporting plate are both curved surfaces adapted to the curvature of the honeycomb core.

2. A curved honeycomb core one-step splicing forming mold according to claim 1, characterized in that: An elastic EPDM rubber pad is pasted on the inner side of the pressing plate.

3. The curved honeycomb core one-step splicing forming mold according to claim 1, characterized in that: The width of the upper pressing plate is 200-250 mm, the width of the lower supporting plate is 200-250 mm, and the width of the lower supporting plate is not less than the width of the corresponding upper pressing plate.

4. The curved honeycomb core one-step splicing forming mold according to claim 1, characterized in that: The base frame comprises an upper base frame and a lower base frame which are arranged in parallel, and a connecting column connecting the upper base frame and the lower base frame. A forklift slot is provided between the upper base frame and the lower base frame.

5. The curved honeycomb core one-step splicing forming mold according to claim 1, characterized in that: A support column connected to the base frame is provided at the bottom of the lowest end of the lower support plate.

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