Processing method of double-curvature aluminum honeycomb

Abstract

The invention provides a processing method of a double-curvature aluminum honeycomb. The processing method comprises the following steps: cutting an aluminum honeycomb core blank from a raw material; the aluminum honeycomb stabilizing device is coated with a release agent; carrying out stabilizing treatment on the aluminum honeycomb core blank by adopting an aluminum honeycomb stabilizing device; stopping blocks with the same height are placed on the periphery tightly attached to the aluminum honeycomb core blank; manufacturing a vacuum bag; carrying out curing treatment on the aluminum honeycomb core blank according to preset curing parameters; processing the front surface of the aluminum honeycomb core blank; after processing, cleaning the aluminum honeycomb core blank; processing the back surface of the aluminum honeycomb core blank; the aluminum honeycomb core part is detected and cut off; according to the method, the aluminum honeycomb glue film is adopted for stabilization, the obtained aluminum honeycomb core grids subjected to numerical control machining are free of tearing phenomenon, the core grid deformation phenomenon is obviously reduced, and meanwhile, the net size precision of parts meets the glue joint assembly requirement through the mode that the tool profile is lengthened.

Description

Technical Field

[0001] This invention belongs to the field of aluminum honeycomb material processing technology, and particularly relates to a processing method for double-curvature aluminum honeycomb. Background Technology

[0002] Hypercurvature aluminum honeycomb material is lightweight, high-strength, and has excellent thermal and sound insulation properties, making it widely used in aerospace, transportation, automotive, and construction industries.

[0003] However, due to its poor rigidity, the double-curvature aluminum honeycomb is prone to deformation during CNC machining, and the excessive resistance at both ends of the aluminum honeycomb leads to excessive thickness deviation. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the aluminum honeycomb core is prone to deformation during CNC machining due to its poor rigidity, and the thickness of the aluminum honeycomb exceeds the tolerance due to excessive resistance at both ends during machining.

[0005] The technical solution of the present invention is to provide a method for preparing hyperbolic aluminum honeycomb, thereby improving the processing accuracy of hyperbolic aluminum honeycomb.

[0006] A method for processing hyperbolic aluminum honeycomb includes: Step 1: Cut aluminum honeycomb core blanks from the raw materials; Step 2: Apply a release agent to the aluminum honeycomb stabilization device; Step 3: Stabilize the aluminum honeycomb core material using an aluminum honeycomb stabilization device; Step 4: Place blocks of the same height around the aluminum honeycomb core material to prevent deformation of the surrounding structure of the aluminum honeycomb core. Step 5: Make vacuum bags; Step 6: Curing the aluminum honeycomb core material according to the preset curing parameters; Step 7: Process the front side of the aluminum honeycomb core blank; Step 8: After processing, clean the aluminum honeycomb core material; Step 9: Process the reverse side of the aluminum honeycomb core material; Step 10: Inspect and cut the aluminum honeycomb core parts.

[0007] In step 1, the required blank size (x+200)*(y+100) is cut from the raw material according to the maximum length x and maximum width y of the part, and the blank is polished so that the visible flatness of the upper and lower surfaces of the blank is no greater than 0.1, and finally the aluminum honeycomb core blank is obtained.

[0008] In step 2, a release agent is applied to the aluminum honeycomb stabilization device and the block of the aluminum honeycomb stabilization device: the first application is along the X direction of the device, and after drying for a preset time such as 15 minutes, the second application is along the Y direction of the device, and after drying for a preset time such as 15 minutes, the third application is along the X direction of the device, and after drying for a preset time such as 30 minutes, the device is put into a clean room for use.

[0009] In step 3, firstly, a layer of adhesive film of the same system as the metal adhesive is laid on the aluminum honeycomb stabilization device. The adhesive film should be laid as a whole. If the size is insufficient, the adhesive film is spliced ​​together with a splicing gap of 0-1.5mm. The adhesive film should be laid in a way that avoids creating grooves and ridges. After the adhesive film is laid, air bubbles are removed by needle punching or rolling. Then, the aluminum honeycomb core blank is placed on the adhesive film, always keeping the edge of the adhesive film 0-6mm longer than the edge of the aluminum honeycomb core blank. Finally, another layer of adhesive film of the same system as the metal adhesive is laid on the aluminum honeycomb core blank.

[0010] In step 6, the curing parameters are as follows: vacuum pressure of 0.08–0.1 MPa, heating rate not exceeding 3°C / min, heating to 125±5°C, holding at temperature and pressure for 90–300 min, and finally cooling to below 60°C at a rate not exceeding 3°C / min before unloading. In one implementation, the heating rate is controlled below 1.5°C / min, and the holding at temperature and pressure is 135 min.

[0011] In step 7, before clamping, clean the workbench surface, attach the aluminum honeycomb core material to the workbench surface with double-sided tape, press it flat, and make the aluminum honeycomb core material bond with the double-sided tape in a natural state as much as possible to avoid clamping under tension; the double-sided tape should be laid neatly and cover all areas of the aluminum honeycomb core material as much as possible, especially the processing area. The tape should not have wrinkles to prevent the honeycomb from being lifted and causing overcutting of the parts during processing. Call the program to process.

[0012] In step 8, after processing the front side of the aluminum honeycomb core material, the aluminum shavings inside the honeycomb cells are cleaned with a vacuum cleaner to prevent them from affecting the processing on the reverse side.

[0013] In step 9, before fixing the aluminum honeycomb core blank onto the CNC machining device, a feeler gauge is used to check and ensure that the gap between the aluminum honeycomb core blank and the CNC machining device is uniform. The machined front side is then clamped onto the CNC machining device using double-sided tape, with the double-sided tape being used in the same way as in step 7. The program is then called to process the part, which is the aluminum honeycomb core part. The length of the CNC machining device is greater than the net length of the aluminum honeycomb core part, with each end being 100mm longer to ensure that the dimensional accuracy within the net dimensions of the part meets the requirements.

[0014] In step 10, a chuck is used to check whether the height tolerance of the aluminum honeycomb core part is within ±0.3mm. After the requirement is met, the aluminum honeycomb core part is cut on the CNC machining device based on the CNC milling program, and the aluminum honeycomb core part is taken out.

[0015] The beneficial effects of this application are as follows: By using aluminum honeycomb film for stabilization, the aluminum honeycomb core cells after CNC machining show no tearing and the core cell deformation is significantly reduced. At the same time, by lengthening the tooling surface, the net dimensional accuracy of the parts meets the requirements of adhesive bonding assembly. Attached Figure Description

[0016] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is a schematic diagram of the tooling of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0019] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited from each other.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] In this embodiment of the invention, a metal adhesive film of the same system is applied to the upper and lower surfaces of the processed aluminum honeycomb blank and cured to increase the stability of the aluminum honeycomb. At the same time, when processing the reverse side of the aluminum honeycomb, the tooling surface for fixing the aluminum honeycomb is lengthened to ensure that the dimensional accuracy within the net dimensions of the part meets the requirements.

[0022] This invention provides a method for preparing hypercurvature aluminum honeycomb, see [link to relevant documentation]. Figure 1 It includes the following steps: Step 1: Cut aluminum honeycomb core blanks from the raw materials; Based on the maximum length x and maximum width y of the part, the required blank size (x+200)*(y+100) is cut from the raw material, and the blank is polished so that the visible flatness of the upper and lower surfaces of the blank is no greater than 0.1, and finally the aluminum honeycomb core blank is obtained.

[0023] Step 2: Apply a release agent to the aluminum honeycomb stabilization device; Apply release agent to the aluminum honeycomb stabilization device and its baffle: first apply along the X direction of the device, and after drying for a preset time such as 15 minutes, apply along the Y direction of the device, and after drying for a preset time such as 15 minutes, apply along the X direction of the device a third time, and after drying for a preset time such as 30 minutes, the device is then placed in a clean room for standby.

[0024] Step 3: Stabilize the aluminum honeycomb core material using an aluminum honeycomb stabilization device; First, lay a layer of adhesive film of the same system as the metal adhesive on the aluminum honeycomb stabilization device. The adhesive film should be laid as a whole. If the size is insufficient, the adhesive film should be spliced ​​together with a splicing gap of 0-1.5mm. The adhesive film should be laid in a way that avoids creating grooves and ridges. After the adhesive film is laid, air bubbles should be removed by needle punching or rolling. Then, place the aluminum honeycomb core blank on the adhesive film, always keeping the edge of the adhesive film 0-6mm longer than the edge of the aluminum honeycomb core blank. Finally, lay another layer of adhesive film of the same system as the metal adhesive on the aluminum honeycomb core blank.

[0025] Step 4: Place blocks of the same height around the aluminum honeycomb core material to prevent deformation of the surrounding structure.

[0026] Step 5: Make vacuum bags. For specific instructions, refer to relevant technologies and use materials such as release film, breathable felt, putty strips, and vacuum bags to make vacuum bags.

[0027] Step 6: Curing the aluminum honeycomb core material according to the preset curing parameters.

[0028] The curing parameters are as follows: vacuum pressure is 0.08-0.1 MPa, heating rate is no more than 3℃ / min (preferably controlled below 1.5℃ / min), heating to 125±5℃, holding at temperature and pressure for 90-300 min (preferably controlled at 135 min), and finally cooling down to below 60℃ at a rate of no more than 3℃ / min before unloading from the oven.

[0029] Step 7: Process the front side of the aluminum honeycomb core material.

[0030] Before clamping, clean the workbench surface. Attach the aluminum honeycomb core blank to the workbench surface using double-sided tape, pressing it flat to ensure the aluminum honeycomb core blank is naturally bonded to the tape, avoiding clamping while being pulled. The double-sided tape should be laid neatly and cover as much of the aluminum honeycomb core blank as possible, especially the machining area. The tape should not have wrinkles to prevent the honeycomb structure from being lifted and causing overcutting during machining. Call the program to perform the machining; the machining process can be referenced from relevant technologies and will not be elaborated here.

[0031] Step 8: After processing, clean the aluminum honeycomb core material.

[0032] After processing the front side of the aluminum honeycomb core blank, use a vacuum cleaner to clean the aluminum shavings inside the honeycomb cells to prevent them from affecting the processing on the back side.

[0033] Step 9: Process the reverse side of the aluminum honeycomb core material.

[0034] Before fixing the aluminum honeycomb core blank onto the CNC machining device, use a feeler gauge to check and ensure that the gap between the aluminum honeycomb core blank and the CNC machining device surface is uniform. Clamp the machined front side onto the CNC machining device using double-sided tape, following the same procedure as in step 7. Call the program to process the aluminum honeycomb core part. The length of the CNC machining device surface is greater than the net length of the aluminum honeycomb core part, with each end being 100mm longer to ensure that the dimensional accuracy within the part's net dimensions meets the requirements.

[0035] Step 10: Inspect and cut the aluminum honeycomb core parts.

[0036] The height tolerance of the aluminum honeycomb core part is checked using a chuck to ensure it is within ±0.3mm. Once the requirement is met, the aluminum honeycomb core part is cut into shape using a CNC milling program on a CNC machining device, and then removed from the machine.

[0037] The above description merely illustrates embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Furthermore, any parts of the present invention not described in detail are conventional techniques.

Claims

1. A method for processing hypercurvature aluminum honeycomb, characterized in that, include: Step 1: Cut aluminum honeycomb core blanks from the raw materials; Step 2: Apply a release agent to the aluminum honeycomb stabilization device; Step 3: Stabilize the aluminum honeycomb core material using an aluminum honeycomb stabilization device; Step 4: Place blocks of the same height around the aluminum honeycomb core material. Step 5: Make vacuum bags; Step 6: Curing the aluminum honeycomb core material according to the preset curing parameters; Step 7: Process the front side of the aluminum honeycomb core blank; Step 8: After processing, clean the aluminum honeycomb core material; Step 9: Process the reverse side of the aluminum honeycomb core material; Step 10: Inspect and cut the aluminum honeycomb core parts.

2. The method as described in claim 1, characterized in that, In step 1, the required blank size (x+200)*(y+100) is cut from the raw material according to the maximum length x and maximum width y of the part, and the blank is polished so that the visible flatness of the upper and lower surfaces of the blank is no greater than 0.1, and finally the aluminum honeycomb core blank is obtained.

3. The method as described in claim 1, characterized in that, In step 2, release agent is applied to the aluminum honeycomb stabilization device and the block of the aluminum honeycomb stabilization device: the first application is along the X direction of the device, and after drying for a preset time such as 15 minutes, the second application is along the Y direction of the device, and after drying for a preset time such as 15 minutes, the third application is along the X direction of the device, and after drying for a preset time such as 30 minutes, the device is put into the clean room for use.

4. The method as described in claim 1, characterized in that, In step 3, firstly, a layer of adhesive film of the same system as the metal adhesive is laid on the aluminum honeycomb stabilization device. The adhesive film needs to be laid as a whole. If the size is not enough, the adhesive film is spliced. The splicing gap is 0-1.5mm. The adhesive film should avoid creating grooves and ridges. After the adhesive film is laid, air bubbles are removed by needle punching or rolling. Then, place the aluminum honeycomb core blank on the adhesive film, always keeping the edge of the adhesive film 0-6mm longer than the edge of the aluminum honeycomb core blank; finally, lay another layer of adhesive film of the same system as the metal adhesive on the aluminum honeycomb core blank.

5. The method as described in claim 1, characterized in that, In step 6, the curing parameters are as follows: vacuum pressure is 0.08~0.1MPa, heating rate is no more than 3℃ / min, heating to 125±5℃, holding at temperature and pressure for 90~300min, and finally cooling down to below 60℃ at a rate of no more than 3℃ / min before unloading from the oven.

6. The method as described in claim 5, characterized in that, The heating rate was controlled below 1.5℃ / min, and the temperature and pressure were maintained for 135 minutes.

7. The method as described in claim 1, characterized in that, In step 7, before clamping, clean the workbench surface, attach the aluminum honeycomb core material to the workbench surface with double-sided tape, press it flat, and make the aluminum honeycomb core material bond with the double-sided tape in its natural state as much as possible; the double-sided tape should be laid neatly and cover all areas of the aluminum honeycomb core material as much as possible, especially the processing area, and the tape should not have wrinkles. Call the program to process.

8. The method as described in claim 1, characterized in that, In step 8, after processing the front side of the aluminum honeycomb core material, the aluminum shavings inside the honeycomb cells of the aluminum honeycomb core material are cleaned with a vacuum cleaner.

9. The method as described in claim 1, characterized in that, In step 9, before fixing the aluminum honeycomb core blank onto the CNC machining device, use a feeler gauge to check and ensure that the gap between the aluminum honeycomb core blank and the CNC machining device is uniform. Then, use double-sided tape to clamp the machined front side onto the CNC machining device. The process of using double-sided tape is the same as in step 7. Call the program to process and obtain the aluminum honeycomb core part. The length of the CNC machining device surface is greater than the net length of the aluminum honeycomb core part.

10. The method as described in claim 1, characterized in that, In step 10, a chuck is used to check whether the height tolerance of the aluminum honeycomb core part is within ±0.3mm. After the requirement is met, the aluminum honeycomb core part is cut on the CNC machining device based on the CNC milling program, and the aluminum honeycomb core part is taken out.

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