Honeycomb plate integral forming process method, honeycomb plate and forming mold

Abstract

The invention discloses a cellular board integral forming process method, a cellular board and a forming mold, relates to the technical field of cellular board forming, and solves the problems that a cellular board prepared by an existing cellular board forming method is poor in quality, high in cost and low in processing efficiency. The method comprises the following steps: pickling a plate to remove oil and stains; brushing protective glue on the upper and lower surfaces of the plate and dividing a diffusion welding area; after the protective glue is dried, carrying out carving treatment; the protection glue is removed, and a non-diffusion area is coated with a welding stopping agent; performing diffusion welding after the fixed plates are combined; after welding is completed, arc rolling is conducted on the plate, and stretching forming is conducted through a forming mold; and finally, shape correction is conducted through a vacuum furnace, and the outline is cut. According to the invention, the method of diffusion welding and cold drawing is adopted for forming, so that the problem of cracking of the honeycomb plate caused by brazing filler metal corrosion under the condition of long-time use is effectively avoided, the production cost is reduced, and the processing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of honeycomb panel forming, and in particular to a honeycomb panel integral forming process method, a honeycomb panel and a forming mould. Background Art

[0002] Titanium alloy honeycomb panel products are usually manufactured by roll forming, additive manufacturing, or sheet metal forming + brazing. The sheet metal forming + brazing method has also limited the application of the product to a certain extent due to the corrosion resistance assessment of the brazing filler metal. There is a problem that the honeycomb panel will crack after long-term use due to brazing corrosion. At the same time, the traditional roll forming method is no longer applicable and can only be manufactured by additive manufacturing. The additive manufacturing method results in high product manufacturing costs and processing efficiency that is difficult to match construction needs. Summary of the invention

[0003] In order to solve the problems of poor quality, high cost and low processing efficiency of honeycomb panels prepared by the above-mentioned existing honeycomb panel forming methods, the present invention proposes a honeycomb panel integrated forming process method, honeycomb panel and forming mold. The present invention forms the honeycomb panel by using diffusion welding and cold stretching, which effectively avoids the problem of cracking of the honeycomb panel under long-term use due to corrosion of the brazing material, reduces production costs and improves processing efficiency.

[0004] The present invention proposes a honeycomb panel integral molding process method, comprising the following steps:

[0005] Step 1: Pickle and degrease the cut sheets; wipe the sheet surface with a dust-free cloth dipped in anhydrous ethanol; apply protective glue on the upper and lower surfaces of the sheet; after the protective glue is dry, perform engraving, and the engraving position is the boundary between the diffusion area and the non-diffusion area; after the engraving is completed, remove the protective glue in the non-diffusion area and apply solder stop, and after the solder stop is dry, remove the protective glue in the diffusion area; assemble the sheets and fix them by spot welding;

[0006] Step 2: Place the assembled sheet materials into the welding equipment, adjust the equipment parameters, and perform diffusion welding;

[0007] Step 3: Process 4 holes at both ends of the welded sheet; bend the sheet along the width direction;

[0008] Step 4: Apply AB glue on the upper and lower edges of the sheet, put the sheet into the forming mold, insert the holes processed at both ends of the sheet into the mold guide columns, and close the mold; assemble the sheet and the mold into the hot pressing molding equipment for molding;

[0009] Step 5: After the forming is completed, the sheet is placed in a vacuum furnace for shape correction; after the shape correction is completed, the outer contour is cut.

[0010] Furthermore, the vacuum degree in the welding equipment is 8×10 -3 Pa.

[0011] Furthermore, the diffusion welding has a welding temperature of 850° C. and a pressure of 2 MPa.

[0012] Furthermore, the welding heating process is to heat up from room temperature to 350°C for 20 minutes, keep at 350°C for 30 minutes, heat up from 350°C to 600°C for 30 minutes, keep at 600°C for 30 minutes, heat up from 600°C to 850°C for 20 minutes; 850°C, pressure 2MPa, holding time 80 minutes; after completion, stop heating and start cooling, and keep the pressure until the furnace temperature drops below 150°C and open the furnace.

[0013] Furthermore, during the shaping process, the vacuum furnace is heated to 600° C. in 2 hours, kept at this temperature for 300 minutes, and then the sheet is cooled along with the furnace.

[0014] A honeycomb panel prepared by the above-mentioned honeycomb panel integrated molding process method comprises an upper cover plate, a plurality of core plates and a lower cover plate, wherein the upper cover plate, the plurality of core plates and the lower cover plate are sequentially connected to form a plurality of honeycomb core cells; the upper cover plate, the plurality of core plates and the lower cover plate are bent along the axis direction of the honeycomb core cells.

[0015] Furthermore, the thickness of the upper cover plate is 2mm-4mm.

[0016] Furthermore, the core plate has a thickness of 1.0 mm to 2.0 mm.

[0017] Furthermore, the thickness of the lower cover plate is 0.3mm-0.4mm.

[0018] A forming mold for preparing the above-mentioned honeycomb panel comprises an upper mold and a lower mold, wherein the upper mold is provided with a plurality of docking grooves, and the lower mold is provided with a plurality of docking blocks, and the docking grooves and the docking blocks cooperate to position the upper mold and the lower mold when the molds are closed; two guide columns are provided at both ends of the lower mold; and the surfaces opposite to the upper mold and the lower mold are arc surfaces.

[0019] The beneficial effects of the honeycomb panel integrated molding process method, honeycomb panel and molding mold described in the present invention are:

[0020] (1) The honeycomb panel integral molding process method, honeycomb panel and molding mold described in the present invention overcome the problems of poor quality, high cost and low processing efficiency of honeycomb panels prepared by existing honeycomb panel molding methods. According to the product structure characteristics, the processing cost and production cycle are fully considered. The non-periodic thin-walled honeycomb structure product is molded by diffusion welding combined with cold stretching to obtain a thin-walled honeycomb product whose joint performance meets the welding rate requirements, strength requirements and size requirements. The honeycomb structure presents a non-periodic continuous change characteristic, which effectively avoids the problem of cracking of the honeycomb panel under long-term use due to brazing corrosion, reduces production costs and improves processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] In the attached picture:

[0023] Figure 1 It is a schematic diagram of the division of the diffusion area on the upper surface of the upper cover plate in the one-piece forming process method of the honeycomb panel described in the present invention;

[0024] Figure 2 It is a schematic diagram of the division of the diffusion area on the lower surface of the upper cover plate in a honeycomb panel integral molding process method described in the present invention;

[0025] Figure 3 It is a schematic diagram of the division of the diffusion area on the upper surface of the first core plate in the honeycomb panel integral molding process method described in the present invention;

[0026] Figure 4 It is a schematic diagram of the division of the diffusion area on the lower surface of the first core plate in the honeycomb panel integral molding process method described in the present invention;

[0027] Figure 5 It is a schematic diagram of the division of the diffusion area on the upper surface of the second core plate in the honeycomb panel integral molding process method described in the present invention;

[0028] Figure 6 It is a schematic diagram of the division of the diffusion area on the lower surface of the second core plate in a honeycomb panel integral molding process method according to the present invention;

[0029] Figure 7 It is a schematic diagram of the division of the diffusion area on the upper surface of the third core plate in the honeycomb panel integral molding process method described in the present invention;

[0030] Figure 8 It is a schematic diagram of the division of the diffusion area on the lower surface of the third core plate in the honeycomb panel integral molding process method described in the present invention;

[0031] Fig. 9 It is a schematic diagram of the division of the diffusion area on the upper surface of the fourth core plate in the honeycomb panel integral molding process method described in the present invention;

[0032] Fig.10 It is a schematic diagram of the division of the diffusion area on the lower surface of the fourth core plate in the honeycomb panel integral molding process method described in the present invention;

[0033] Fig.11 It is a schematic diagram of the division of the diffusion area on the upper surface of the fifth core plate in the honeycomb panel integral molding process method described in the present invention;

[0034] Fig.12 It is a schematic diagram of the division of the diffusion area on the lower surface of the fifth core plate in the honeycomb panel integral molding process method described in the present invention;

[0035] Fig.13 It is a schematic diagram of the division of the diffusion area on the upper surface of the sixth core plate in the honeycomb panel integral molding process method described in the present invention;

[0036] Fig.14 It is a schematic diagram of the division of the diffusion area on the lower surface of the sixth core plate in the honeycomb panel integral molding process method described in the present invention;

[0037] Fig.15 It is a schematic diagram of the division of the diffusion area on the upper surface of the lower cover plate in the one-piece forming process method of the honeycomb panel described in the present invention;

[0038] Fig.16 It is a schematic diagram of the division of the diffusion area on the lower surface of the lower cover plate in a honeycomb panel integral molding process method according to the present invention;

[0039] Fig.17 It is an axonometric view in the main view direction of a honeycomb panel prepared by a honeycomb panel integral molding process method according to the present invention;

[0040] Fig.18 It is an axonometric diagram of a honeycomb panel prepared by a honeycomb panel integral molding process according to the present invention;

[0041] Fig.19 It is a structural schematic diagram of the honeycomb panel forming mold of the present invention;

[0042] Among them: 1-upper cover plate, 2-core plate, 3-lower cover plate, 4-upper die, 5-lower die, 6-docking groove, 7-docking block, 8-guide column, 9-diffusion area, 10-non-diffusion area. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0046] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] Specific implementation method 1: See Figure 1-Figure 19 The embodiment of the present invention is described in detail. The honeycomb panel integral molding process described in the embodiment of the present invention comprises the following steps:

[0048] Step 1: Pickle and degrease the cut sheets to remove the oxide scale, dirt, impurities, etc. on the surface; wipe the surface of the sheet with a dust-free cloth dipped in anhydrous ethanol. When there is no visible stain on the dust-free cloth, it is considered to be qualified; apply protective glue on the upper and lower surfaces of the sheet and divide the diffusion area 9 and the non-diffusion area 10, and the diffusion area 9 is the diffusion welding area; after the protective glue is dry, perform the engraving process, and use a scalpel to engrave according to the engraving template. The engraving position is the boundary between the diffusion area 9 and the non-diffusion area 10; after the engraving is completed, perform the glue removal process, remove the protective glue of the non-diffusion area 10 and apply solder stop, and remove the protective glue of the diffusion area 9 after the solder stop is dry; install the upper cover plate 1, several core plates 2 and the lower cover plate 3 according to the Figures 1 to 16Assemble the sheets in the order of 100 mm / s, and no relative movement should occur between each contact surface; after assembly, cold weld two points at the diagonal positions of the sheet edge;

[0049] Step 2: Place the assembled sheet into the welding equipment, place graphite pads under the assembled sheet to raise the sheet for easy welding; place load-bearing columns on both sides of the length direction of the assembled sheet to prevent the pressure head in the welding equipment from over-pressure and damaging the sheet; adjust the equipment parameters and perform diffusion welding; during the welding process, the vacuum degree in the welding equipment is 8×10 -3 Pa, the temperature of diffusion welding is 850℃, and the pressure in the equipment during welding is 2MPa; the welding heating process is 20min from room temperature to 350℃, 350℃ insulation for 30min, 30min from 350℃ to 600℃, 600℃ insulation for 30min, 20min from 600℃ to 850℃; 850℃, pressure 2MPa, holding time 80min; after completion, stop heating and start cooling, and keep the pressure until the furnace temperature drops below 150℃ and open the furnace

[0050] Step 3: Four holes are processed at both ends of the welded sheet. The holes are used to insert into the four guide posts 8 of the stretching die. The diameter of the holes must be 0.1-0.2 mm larger than the diameter of the guide posts 8. The sheet is rolled along the width direction, with the upper cover plate 1 on the outside, and rolled along the width direction into an arc with an outer surface radius of the required size.

[0051] Step 4: Apply AB glue on the upper and lower edges of the sheet, put the sheet into the forming mold, insert the holes processed at both ends of the sheet into the mold guide columns, close the mold, and wait for the glue to solidify; after the glue solidifies, assemble the sheet and the mold into the hot pressing molding equipment for molding; before the molding begins, record the position of the upper mold 4; move the upper mold 4 upward slowly, and stop moving the upper mold 4 when the upper mold 4 moves upward 65mm; insert the support block into the formed core cell, take the molding mold and the formed sheet out of the hot pressing molding equipment, and remove the sheet together with the support block from the molding mold;

[0052] Step 5. The formed sheet is placed in a vacuum furnace for calibration. During the calibration process, the vacuum furnace is heated to 600°C in 2 hours. After keeping the temperature for 300 minutes, the sheet is cooled with the furnace. After the calibration is completed, the outer contour of the product is cut out according to the required size line.

[0053] A honeycomb panel prepared by the above-mentioned honeycomb panel integrated molding process method specifically includes an upper cover plate 1, a plurality of core plates 2 and a lower cover plate 3, wherein the upper cover plate 1, a plurality of core plates 2 and a lower cover plate 3 are connected in sequence to form a plurality of honeycomb core cells, the cross-section of the honeycomb core cells formed between the plurality of core plates 2 is hexagonal, and the cross-section of the honeycomb core cells formed between the core plate 2 and the upper cover plate 1 and between the core plate 2 and the lower cover plate 3 is trapezoidal; the upper cover plate 1, the plurality of core plates 2 and the lower cover plate 3 are bent along the axis direction of the honeycomb core cells.

[0054] The thickness of the upper cover plate 1 is 2mm-4mm. The thickness of the core plate 2 is 1.0mm-2.0mm. The thickness of the lower cover plate 3 is 0.3mm-0.4mm. The material is pure titanium.

[0055] A forming mold for preparing the above-mentioned honeycomb panel specifically comprises an upper mold 4 and a lower mold 5, wherein the upper mold 4 is provided with a plurality of docking grooves 6, and the lower mold 5 is provided with a plurality of docking blocks 7, wherein the docking grooves 6 and the docking blocks 7 cooperate to position the upper mold 4 and the lower mold 5 when the molds are closed; two guide columns 8 are provided at both ends of the lower mold 5, and the holes milled at both ends of the sheet material are sleeved on the guide columns 8, so that the sheet material is stretched along the direction of the guide columns 8 during the stretching forming process; the surfaces opposite to the upper mold 4 and the lower mold 5 are arc-shaped surfaces, which fit with the upper cover plate 1 and the lower cover plate 3 after arcing.

[0056] To summarize the above implementation cases, the honeycomb panel integrated molding process method, honeycomb panel and molding mold described in the present invention overcome the problems of poor quality, high cost and low processing efficiency of honeycomb panels prepared by existing honeycomb panel molding methods. According to the product structure characteristics, the processing cost and production cycle are fully considered. The non-periodic thin-walled honeycomb structure products are formed by diffusion welding combined with cold stretching to obtain thin-walled honeycomb products whose joint performance meets the welding rate requirements, strength requirements and size requirements. The honeycomb structure presents the characteristics of non-periodic continuous changes, which effectively avoids the problem of cracking of the honeycomb panel under long-term use due to solder corrosion, reduces production costs and improves processing efficiency.

[0057] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the invention. It can also be a reasonable combination of the features recorded in the above implementation methods. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A honeycomb panel integral molding process, characterized in that: The following steps are involved: Step 1: Pickle and degrease the cut sheet; wipe the surface of the sheet with a dust-free cloth dipped in anhydrous ethanol; apply protective glue on the upper and lower surfaces of the sheet; after the protective glue is dry, perform a pattern-carving process, where the pattern-carving position is the boundary between the diffusion area (9) and the non-diffusion area (10); after the pattern-carving is completed, remove the protective glue on the non-diffusion area (10) and apply solder stop; after the solder stop is dry, remove the protective glue on the diffusion area (9); assemble the sheets and fix them by spot welding; Step 2: Place the assembled sheet materials into the welding equipment, adjust the equipment parameters, and perform diffusion welding; Step 3: Process 4 holes at both ends of the welded sheet; bend the sheet along the width direction; Step 4: Apply AB glue on the upper and lower edges of the sheet, place the sheet into the forming mold, insert the holes processed at both ends of the sheet into the mold guide pillars (8), and close the mold; assemble the sheet and the mold into the hot pressing molding equipment for molding; Step 5: After the forming is completed, the sheet is placed in a vacuum furnace for shape correction; after the shape correction is completed, the outer contour is cut.

2. The honeycomb panel integral molding process according to claim 1, characterized in that: The vacuum degree in the welding equipment is 8×10 -3 Pa.

3. The honeycomb panel integral molding process according to claim 1, characterized in that: The welding temperature of the diffusion welding is 850° C. and the pressure is 2 MPa.

4. The honeycomb panel integral molding process according to claim 3, characterized in that: The welding heating process is as follows: heating from room temperature to 350°C for 20 minutes, keeping at 350°C for 30 minutes, heating from 350°C to 600°C for 30 minutes, keeping at 600°C for 30 minutes, heating from 600°C to 850°C for 20 minutes; 850°C, pressure 2MPa, holding time 80 minutes; after completion, stop heating and start cooling, and keep the pressure until the furnace temperature drops below 150°C and then open the furnace.

5. The honeycomb panel integral molding process according to claim 1, characterized in that: During the shaping process, the vacuum furnace is heated to 600° C. in 2 hours, and the sheet is cooled along with the furnace after being kept at the temperature for 300 minutes.

6. A honeycomb panel manufactured by the honeycomb panel integral molding process according to claim 1, characterized in that: The invention comprises an upper cover plate (1), a plurality of core plates (2) and a lower cover plate (3); the upper cover plate (1), a plurality of core plates (2) and a lower cover plate (3) are connected in sequence to form a plurality of honeycomb core cells; the upper cover plate (1), a plurality of core plates (2) and a lower cover plate (3) are bent along the axis direction of the honeycomb core cells.

7. The honeycomb panel manufactured by the honeycomb panel integral molding process according to claim 6, characterized in that: The thickness of the upper cover plate (1) is 2 mm to 4 mm.

8. The honeycomb panel manufactured by the honeycomb panel integral molding process according to claim 6, characterized in that: The core plate (2) has a thickness of 1.0 mm to 2.0 mm.

9. The honeycomb panel manufactured by the honeycomb panel integral molding process according to claim 6, characterized in that: The thickness of the lower cover plate (3) is 0.3 mm-0.4 mm.

10. A forming mold for preparing the honeycomb panel according to any one of claims 6 to 9, characterized in that: The invention comprises an upper die (4) and a lower die (5); the upper die (4) is provided with a plurality of docking grooves (6); the lower die (5) is provided with a plurality of docking blocks (7); the docking grooves (6) and the docking blocks (7) cooperate to position the upper die (4) and the lower die (5) when the die is closed; two guide columns (8) are provided at both ends of the lower die (5); and the surfaces facing each other of the upper die (4) and the lower die (5) are arc-shaped surfaces.

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