Cellular core sub-excavation apparatus and method for a cellular sandwich structure

Abstract

The application discloses a honeycomb core excavating device and method of a honeycomb sandwich structure. The honeycomb core excavating device of the honeycomb sandwich structure comprises a cutting head, which comprises: an axial cutting tool, which is in a cylindrical shape; an axial cutting driving device; a circumferential cutting driving device, which is arranged in the axial cutting tool and is rotatable relative to the axial cutting tool; a plurality of sub-rotation shafts, the upper end of each sub-rotation shaft is in transmission connection with the circumferential cutting driving device and the lower end extends out of the axial cutting tool; and a plurality of sub-cutting tools, which are respectively arranged on the plurality of sub-rotation shafts, are located below the axial cutting tool and are respectively adapted to extend into a plurality of honeycomb holes of the honeycomb sandwich structure and to cut the side wall of the honeycomb hole when the sub-rotation shaft rotates. The honeycomb core excavating device of the honeycomb sandwich structure according to the embodiment of the application has the advantages of low excavating difficulty, high excavating efficiency, good excavating quality and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of honeycomb sandwich structure repair, in particular to a honeycomb core excavating device for honeycomb sandwich structure and a honeycomb core excavating method for honeycomb sandwich structure. BACKGROUND

[0002] The honeycomb sandwich structure is widely used in the field of aerospace as a structure with good lightweight, wave-absorbing performance and designability. However, due to its complex structure and material properties, the honeycomb sandwich structure is prone to damage. These damages can cause a significant decline in the performance of the honeycomb sandwich structure.

[0003] The repair method for the honeycomb sandwich structure in the related art is to manually cut the damaged honeycomb core after polishing the skin to expose the honeycomb core. However, due to the complex and special structural properties of the honeycomb sandwich structure, it is difficult to cut, and a lot of time and effort is consumed in the cutting process. Moreover, the undamaged part is easily damaged, and the cutting quality is difficult to guarantee, especially when the honeycomb core needs to be cut at a certain depth. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a honeycomb core excavating device for honeycomb sandwich structure, which has the advantages of low excavation difficulty, high excavation efficiency and good excavation quality.

[0005] The present application also proposes a honeycomb core excavating method for honeycomb sandwich structure.

[0006] To achieve the above-mentioned purpose, according to the first aspect of the present application, a honeycomb core excavating device for honeycomb sandwich structure is provided, which comprises a cutting head, the cutting head comprising: an axial cutting tool, the axial cutting tool being a cylinder with an open lower end and having a cutting edge at the lower end; an axial cutting drive device, the axial cutting drive device being in transmission connection with the axial cutting tool to drive the axial cutting tool to rotate; a circumferential cutting drive device, the circumferential cutting drive device being arranged in the axial cutting tool and being rotatable relative to the axial cutting tool; a plurality of sub-rotation shafts, the upper end of each sub-rotation shaft being in transmission connection with the circumferential cutting drive device and the lower end of each sub-rotation shaft extending out of the axial cutting tool; a plurality of sub-cutters, each sub-cutter being arranged on a corresponding sub-rotation shaft and rotating with the corresponding sub-rotation shaft, the sub-cutters being located below the axial cutting tool, and each sub-cutter being adapted to extend into a corresponding honeycomb hole of the honeycomb sandwich structure and to cut the side wall of the corresponding honeycomb hole when the corresponding sub-rotation shaft rotates.

[0007] The honeycomb core sub-excavating device of the honeycomb sandwich structure has the advantages of low difficulty, high efficiency and good quality.

[0008] In addition, the honeycomb core sub-excavating device of the honeycomb sandwich structure according to the above-mentioned embodiment of the present application can further have the following additional technical features:

[0009] According to one embodiment of the present application, the circumferential cutting driving device comprises a circumferential cutting motor, the circumferential cutting motor comprises a motor body and a motor shaft, the motor body of the circumferential cutting motor is arranged in the axial cutting tool and is rotatable relative to the axial cutting tool; a transmission mechanism, the motor shaft of the circumferential cutting motor is in transmission connection with a plurality of sub-rotation shafts through the transmission mechanism.

[0010] According to one embodiment of the present application, the honeycomb core sub-excavating device of the honeycomb sandwich structure further comprises an adapter shaft, the adapter shaft has an upper half shaft and a lower half shaft, the upper half shaft and the lower half shaft are relatively rotatable, the upper half shaft is connected with the inner top surface of the axial cutting tool, and the lower half shaft is connected with the circumferential cutting driving device.

[0011] According to one embodiment of the present application, the maximum distance between the horizontal direction edge of the sub-tool and the rotation axis of the sub-rotation shaft is equal to the radius of the circumscribed circle of the hexagon of the honeycomb hole.

[0012] According to one embodiment of the present application, the sub-tool is triangular in horizontal plane projection.

[0013] According to one embodiment of the present application, a plurality of sub-rotation shafts are arranged in a regular hexagonal array in the horizontal direction.

[0014] According to one embodiment of the present application, the honeycomb core sub-excavating device of the honeycomb sandwich structure further comprises a base, a mechanical arm arranged on the base, the cutting head arranged on the mechanical arm, and a work platform suitable for placing the honeycomb sandwich structure to be processed, the work platform arranged on the base.

[0015] According to one embodiment of the present application, the axial cutting driving device is an axial cutting motor, the mechanical arm is connected with the motor body of the axial cutting motor, and the axial cutting tool is in transmission connection with the motor shaft of the axial cutting motor.

[0016] According to one embodiment of the present application, the sub-tool is detachably arranged on the sub-rotation shaft, the axial cutting tool is detachably connected with the axial cutting driving device, and the circumferential cutting driving device is detachably arranged in the axial cutting tool.

[0017] According to the embodiment of the second aspect of the present application, a honeycomb core excavating method of honeycomb sandwich structure is provided, which uses the honeycomb core excavating device of honeycomb sandwich structure according to the embodiment of the first aspect of the present application, and comprises the following steps:

[0018] Determining the damage radius and the damage depth of the damaged area on the honeycomb sandwich structure to be processed;

[0019] Determining the excavating radius and the excavating depth of the honeycomb core to be excavated according to the damage radius and the damage depth;

[0020] Polishing the skin of the honeycomb sandwich structure according to the excavating radius to expose the honeycomb core to be excavated;

[0021] Selecting the axial cutting tool with corresponding size according to the excavating radius, and determining the number of the sub-cutting tools according to the number of the honeycomb cells to be cut;

[0022] Moving the cutting head above the honeycomb core to be excavated and aligning the honeycomb core to be excavated, so that the sub-cutting tools are aligned with the honeycomb cells;

[0023] Starting the axial cutting driving device to rotate the axial cutting tool, and lowering the cutting head to axially cut the honeycomb core, and then stopping the axial cutting driving device when reaching the specified depth, and lifting the cutting head by a predetermined distance, which is the axial distance between the lower end of the axial cutting tool and the sub-cutting tools;

[0024] Starting the circumferential cutting driving device to rotate the sub-cutting tools to cut the side wall of the honeycomb cell;

[0025] After the cutting is completed, the cutting head is lifted to leave the honeycomb sandwich structure, and the whole cutting work is completed.

[0026] The honeycomb core excavating method of honeycomb sandwich structure according to the embodiment of the present application has the advantages of low excavating difficulty, high excavating efficiency and good excavating quality, etc. by using the honeycomb core excavating device of honeycomb sandwich structure according to the embodiment of the first aspect of the present application.

[0027] Additional aspects and advantages of the present application will be made apparent by the following description and the appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, including the accompanying drawings, in which:

[0029] Figure 1It is a partial structure schematic diagram of the honeycomb core excavating device of the honeycomb sandwich structure according to the embodiment of the present application.

[0030] Figure 2 It is a partial structure schematic diagram of the honeycomb core excavating device of the honeycomb sandwich structure according to the embodiment of the present application.

[0031] Figure 3 It is a structure schematic diagram of the honeycomb core excavating device of the honeycomb sandwich structure according to the embodiment of the present application.

[0032] Figure 4 It is a partial structure schematic diagram of the honeycomb core excavating device of the honeycomb sandwich structure according to the embodiment of the present application.

[0033] Figure 5 It is a partial structure schematic diagram of the honeycomb core excavating device of the honeycomb sandwich structure according to the embodiment of the present application.

[0034] Figure 6 It is a flowchart of the honeycomb core excavating method of the honeycomb sandwich structure according to the embodiment of the present application. The flowchart is marked with the following: the honeycomb core excavating device 1 of the honeycomb sandwich structure, the cutting head 10, the axial cutting tool 100, the axial cutting driving device 200, the circumferential cutting driving device 300, the circumferential cutting motor 310, the transmission mechanism 320, the sub-rotating shaft 400, the sub-tool 500, the adapter shaft 600, the mechanical arm 20, the control device 30, the honeycomb sandwich structure 2, the skin 3, the honeycomb core 4, the polishing groove 5, and the honeycomb hole 6. DETAILED DESCRIPTION

[0035] The present application is based on the discovery and realization of the inventors on the following facts and problems:

[0036] The repair method of the honeycomb sandwich structure in the related art is to manually cut the damaged honeycomb core after polishing the skin to expose the honeycomb core, but due to the complex and special structural properties of the honeycomb sandwich structure, it is difficult to cut, and it takes a lot of time and effort in the cutting process, and it is easy to damage the undamaged part, and the cutting quality is difficult to guarantee, especially when the honeycomb core needs to be cut to a certain depth, it is more difficult.

[0037] Specifically, the honeycomb core of the honeycomb sandwich structure is a hexagonal honeycomb structure, with an array of hexagonal honeycomb holes, each honeycomb hole has a limited size, and conventional cutting tools cannot be inserted. Moreover, if the honeycomb core needs to be cut to a certain depth, not only the honeycomb core needs to be cut in the axial direction of the honeycomb hole, but also the side wall of the honeycomb hole needs to be cut circumferentially. Conventional cutting tools are difficult to complete, and are easy to damage other parts during cutting, and the cutting quality is difficult to guarantee.

[0038] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below are exemplary and are intended to explain the present application, but are not to be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] A honeycomb core excavating device 1 for a honeycomb sandwich structure according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0042] As shown in Figures 1-6 The honeycomb core excavating device 1 for a honeycomb sandwich structure according to an embodiment of the present application includes a cutting head 10.

[0043] Specifically, the cutting head 10 can be mounted on a moving device, such as a robot arm 20, a multi-axis machine tool. The cutting head 10 and the moving device can be connected with a control device 30, such as a computer, a numerical control device, etc.

[0044] The cutting head 10 includes an axial cutting tool 100, an axial cutting driving device 200, a circumferential cutting driving device 300, a plurality of sub-rotation shafts 400 and a plurality of sub-cutting tools 500.

[0045] The axial cutting tool 100 is a cylinder with an open lower end and has a cutting edge at the lower end (the up-down direction is shown by the arrow in the figure). The axial cutting driving device 200 is in driving connection with the axial cutting tool 100 to drive the axial cutting tool 100 to rotate. The circumferential cutting driving device 300 is arranged in the axial cutting tool 100 and is rotatable relative to the axial cutting tool 100. The upper end of each sub-rotating shaft 400 is in driving connection with the circumferential cutting driving device 300 and the lower end extends out of the axial cutting tool 100. A plurality of sub-cutting tools 500 are arranged on the plurality of sub-rotating shafts 400 respectively and rotate with the sub-rotating shafts 400. The sub-cutting tools 500 are below the axial cutting tool 100. The plurality of sub-cutting tools 500 are adapted to extend into the plurality of honeycomb holes 6 of the honeycomb sandwich structure 2 respectively and are adapted to cut the side wall of the honeycomb hole 6 in which the sub-cutting tool 500 is located when the sub-rotating shaft 400 rotates.

[0046] For example, "the plurality of sub-cutting tools 500 are adapted to extend into the plurality of honeycomb holes 6 of the honeycomb sandwich structure 2 respectively and are adapted to cut the side wall of the honeycomb hole 6 in which the sub-cutting tool 500 is located when the sub-rotating shaft 400 rotates." can be that the size of the sub-cutting tool 500 is smaller than the honeycomb hole 6 and the sub-cutting tool 500 rotates eccentrically to form a cutting radius larger than the honeycomb hole 6, or the cutting radius of the sub-cutting tool 500 can be equal to the circumradius of the honeycomb hole 6, as shown in Figure 5 The maximum distance between the horizontal edge of the sub-cutting tool 500 and the rotating axis is equal to the circumradius of the honeycomb hole 6, and the sub-cutting tool 500 forms a cutting range as shown in Figure 5 When the sub-cutting tool 500 rotates, since the honeycomb hole 6 is hexagonal, the distance between the vertex of the honeycomb hole 6 and the central axis is equal to the circumradius of the honeycomb hole 6, so the sub-cutting tool 500 can extend into the honeycomb hole 6 at the vertex of the honeycomb hole 6 and cut the side wall of the honeycomb hole 6 by coaxial rotation. It should be understood that since the honeycomb hole 6 has a certain thickness, there may be slight incomplete cutting at the end point, but it does not affect the separation of the cut honeycomb core 4.

[0047] Specifically, when cutting, first, the damage radius and the damage depth of the damage area on the honeycomb sandwich structure 2 to be processed are determined, the excavation radius and the excavation depth of the honeycomb core 4 to be excavated are determined according to the damage radius and the damage depth, and the skin 3 of the honeycomb sandwich structure 2 is polished according to the excavation radius, so that the honeycomb core 4 to be excavated is exposed, as shown in Figure 3 and Figure 4 After polishing, a polishing groove 5 is formed on the skin 3, and the honeycomb core 4 to be excavated is exposed from the polishing groove 5. It should be understood that the damage radius and the damage depth of the damage area on the honeycomb sandwich structure 2 can be obtained by non-destructive testing.

[0048] Afterwards, according to the radius of the excavation, the axial cutting tool 100 of corresponding size is selected, and according to the number of honeycomb holes 6 to be cut, the number of sub-cutters 500 needed is determined. Specifically, since the size of the honeycomb hole 6 generally does not change, the size of the sub-cutter 500 can not need to be changed when the size of the honeycomb hole 6 does not change. When selecting the size of the axial cutting tool 100 and the number of sub-cutters 500, the cutting head 10 can be replaced as a whole, or only the axial cutting tool 100 and the number of sub-cutters 500 can be replaced.

[0049] The cutting head 10 is moved above the honeycomb core 4 to be excavated and aligned with the honeycomb core 4 to be excavated, and the sub-cutter 500 is aligned with the honeycomb hole 6. Specifically, in the mode that the maximum distance between the horizontal direction edge of the sub-cutter 500 and the rotation axis is equal to the circumcircle radius of the honeycomb hole 6 and the sub-cutter 500 rotates coaxially with the honeycomb hole 6, the position where the edge of the sub-cutter 500 is most protruding needs to be aligned with the vertex of the honeycomb hole 6, for example Figure 5 As shown, when the sub-cutter 500 is triangular, the vertex of the sub-cutter 500 is aligned with the vertex of the honeycomb hole 6.

[0050] The axial cutting drive device 200 is started to rotate the axial cutting tool 100, the cutting head 10 is lowered to perform axial cutting on the honeycomb core 4, and after reaching the specified depth, the axial cutting drive device 200 is turned off, the cutting head 10 is lifted by a predetermined distance, which is the axial distance between the lower end of the axial cutting tool 100 and the sub-cutter 500. The circumferential cutting motor 310 is started to rotate the sub-cutter 500, and the sub-cutter 500 cuts the side wall of the honeycomb hole 6 where it is located. Specifically, in order to facilitate cutting of the sub-cutter 500 and avoid interference of the axial cutting tool 100 with the sub-cutter 500, the axial cutting tool 100 needs to be avoided by the sub-cutter 500, so the sub-cutter 500 is arranged below the axial cutting tool 100. Since the sub-cutter 500 is arranged below the axial cutting tool 100, there is a certain distance between the lower end of the axial cutting tool 100 and the sub-cutter 500, i.e. the predetermined distance. When cutting a honeycomb core 4 of a specific depth is needed, in order to ensure that the cutting depth of the axial cutting tool 100 and the sub-cutter 500 is consistent, the sub-cutter 500 needs to be lifted by the predetermined distance after the axial cutting tool 100 has finished cutting, so that the cutting position of the sub-cutter 500 in the axial direction of the honeycomb hole 6 is consistent with the axial cutting depth of the axial cutting tool 100.

[0051] Finally, after cutting is completed, the cutting head 10 is raised to leave the honeycomb sandwich structure 2, and the entire cutting work is completed.

[0052] The movement and start-stop of the cutting head 10 can be controlled by the control device 30 after inputting parameters to the control device 30, so as to improve the control precision. Specifically, when the maximum distance between the horizontal direction edge of the sub-cutter 500 and the rotation axis is equal to the radius of the circumscribed circle of the honeycomb hole 6 and the sub-cutter 500 rotates coaxially with the honeycomb hole 6, the sub-cutter 500 can be stopped and abutted below the honeycomb core 4 after cutting, so that the honeycomb core 4 to be cut is taken out together when the cutting head 10 is lifted.

[0053] According to the honeycomb core excavating device 1 of the honeycomb sandwich structure, the axial cutting cutter 100 and the axial cutting driving device 200 are arranged, the axial cutting driving device 200 is used to drive the axial cutting cutter 100 to rotate, so as to cut the side wall of the honeycomb hole 6 in the axial direction, the sub-cutter 500 is arranged, the sub-cutter 500 is used to cut the side wall of the honeycomb hole 6 in the circumferential direction by extending into the honeycomb hole 6, so that the honeycomb core 4 can be excavated to a predetermined depth, the damaged area of the honeycomb sandwich structure 2 can be quickly excavated, the time required for excavating the damaged honeycomb core 4 is reduced, the difficulty of excavation is reduced, the excavation and repair efficiency is significantly improved, and the excavation process is not easy to cause damage to the undamaged part, so that the excavation quality is more easily ensured.

[0054] Further, the sub-cutter 500 is arranged below the axial cutting cutter 100, the axial cutting cutter 100 can avoid the interference with the sub-cutter 500, and the cutting range of the sub-cutter 500 is facilitated to be ensured.

[0055] In addition, the circumferential cutting driving device 300 is arranged in the axial cutting cutter 100 in a relatively rotatable manner, so that the circumferential cutting driving device 300 is prevented from rotating with the axial cutting cutter 100, and the sub-cutter 500 can be kept stable when the axial cutting cutter 100 cuts.

[0056] Therefore, the honeycomb core excavating device 1 of the honeycomb sandwich structure according to the embodiment of the present application has the advantages of low excavation difficulty, high excavation efficiency, good excavation quality and the like.

[0057] Hereinafter, the honeycomb core excavating device 1 of the honeycomb sandwich structure according to the embodiment of the present application will be described with reference to the accompanying drawings.

[0058] In some embodiments of the present application, as shown in Figures 1-6 The honeycomb core excavating device 1 of the honeycomb sandwich structure according to the embodiment of the present application includes a cutting head 10. The cutting head 10 includes an axial cutting cutter 100, an axial cutting driving device 200, a circumferential cutting driving device 300, a plurality of sub-rotation shafts 400 and a plurality of sub-cutters 500.

[0059] Specifically, as shown in Figure 1and Figure 4 As shown, the circumferential cutting drive device 300 includes a circumferential cutting motor 310 and a transmission mechanism 320. The circumferential cutting motor 310 includes a motor body and a motor shaft. The motor body of the circumferential cutting motor 310 is disposed within the axial cutting tool 100 and is rotatable relative to the axial cutting tool 100. The motor shaft of the circumferential cutting motor 310 is connected to multiple sub-shafts 400 respectively through the transmission mechanism 320. Specifically, the transmission mechanism 320 can be a gear transmission mechanism. This facilitates the circumferential cutting drive device 300 in driving the multiple sub-shafts 400 to rotate.

[0060] For example, the circumferential cutting motor 310 can be connected to the main drive gear. When the main drive gear rotates, power is transmitted to the output gear through intermediate gears, which can include one or more of spur gears, helical gears, or bevel gears to accommodate changes in power transmission direction and gear ratio adjustments. Driven gears are connected to the sub-shafts 400, and these shaft gears mesh with the output gear. Ensuring that the gear ratio between the driven gear connected to each sub-shaft 400 and the main drive gear is the same transmits the rotational motion of the circumferential cutting motor 310 to the sub-shafts 400, driving the sub-cutting tool 500 to perform the cutting action. Each gear can be supported by bearings to ensure stable operation.

[0061] More specifically, such as Figure 1 As shown, the cutting head 10 also includes an adapter shaft 600, which has an upper half-shaft and a lower half-shaft. The upper half-shaft and the lower half-shaft are rotatable relative to each other. The upper half-shaft is connected to the inner top surface of the axial cutting tool 100, and the lower half-shaft is connected to the circumferential cutting drive device 300. Specifically, the motor body of the circumferential cutting motor 310 of the circumferential cutting drive device 300 is connected to the lower half-shaft of the sub-rotating shaft 400. This facilitates the rotatable connection between the circumferential cutting drive device 300 and the axial cutting tool 100.

[0062] Advantageously, such as Figure 5 As shown, the maximum distance between the horizontal edge of the sub-cutting tool 500 and the rotation axis of the sub-rotating shaft 400 is equal to the radius of the circumscribed circle of the hexagon of the honeycomb hole 6. This allows the sub-cutting tool 500 to form, when rotating, a shape resembling... Figure 5 As shown in Figure a, the cutting range is such that, since the honeycomb hole 6 is hexagonal, the distance between the vertex of the honeycomb hole 6 and the central axis is equal to the radius of the circumscribed circle of the honeycomb hole 6. Therefore, the sub-cutting tool 500 can extend into the honeycomb hole 6 at the vertex of the honeycomb hole 6 and cut the side wall of the honeycomb hole 6 by coaxial rotation. This makes it easier for the sub-cutting tool 500 to extend into the honeycomb hole 6 and perform circumferential cutting on the side wall of the honeycomb hole 6. Moreover, after the sub-cutting tool 500 stops rotating after cutting, it can stop below the cut honeycomb core 4, so that when the cutting head 10 is raised, the cut honeycomb core 4 is brought out together, saving the process of taking out the cut honeycomb core 4.

[0063] More advantageously, as shown in Figure 2 and Figure 5 , the sub-cutter 500 is triangular in horizontal projection. Specifically, the sub-cutter 500 can have a wide end and a narrow end in the length direction, and the narrow end of the sub-cutter 500 in the length direction forms a cutting edge. The sub-cutter 500 can be an isosceles triangle with the length of the leg greater than the length of the base. In this way, the sub-cutter 500 can be inserted into the honeycomb hole 6 after aligning the triangular apex of the sub-cutter 500 with the hexagonal apex of the honeycomb hole 6, and the sharpness of the cutting edge of the sub-cutter 500 can be improved, and the dynamic balance accuracy of the sub-cutter 500 can be improved.

[0064] Further, the plurality of sub-rotation shafts 400 are arranged in a regular hexagonal array in the horizontal direction. In this way, the sub-rotation shafts 400 and the sub-cutter 500 can be inserted into the honeycomb hole 6, and the number of sub-cutter 500 can be adjusted according to the number of honeycomb holes 6 to be cut.

[0065] Figure 3 A honeycomb core sub-excavation device 1 of a honeycomb sandwich structure according to some examples of the present application is shown. As shown in Figure 3 , the honeycomb core sub-excavation device 1 of the honeycomb sandwich structure further comprises a base, a mechanical arm 20 and a workbench. The mechanical arm 20 is provided on the base, and the cutting head 10 is provided on the mechanical arm 20. The workbench is adapted to place the honeycomb sandwich structure 2 to be processed, and the workbench is provided on the base. Specifically, the cutting head 10 and the mechanical arm 20 can be connected with a control device 30. In this way, the mechanical arm 20 can be used to drive the cutting head 10 to move, and the cutting head 10 can be automatically and accurately controlled.

[0066] Optionally, as shown in Figure 3 , the axial cutting drive device 200 is an axial cutting motor, the axial cutting motor comprises a motor body and a motor shaft, the mechanical arm 20 is connected with the motor body of the axial cutting motor, and the axial cutting cutter 100 is in transmission connection with the motor shaft of the axial cutting motor. In this way, the mechanical arm 20 can drive the cutting head 10 to perform axial cutting.

[0067] Advantageously, the sub-cutter 500 is detachably provided on the sub-rotation shaft 400, the axial cutting cutter 100 is detachably connected with the axial cutting drive device 200, and the circumferential cutting drive device 300 is detachably provided in the axial cutting cutter 100. Specifically, the sub-cutter 500 and the sub-rotation shaft 400 are bolted. In this way, the size of the axial cutting cutter 100 and the number of sub-cutter 500 can be adjusted, and the applicability of the honeycomb core sub-excavation device 1 of the honeycomb sandwich structure can be improved.

[0068] Specifically, the rotation speed of the axial cutting drive device 200 and the circumferential cutting drive device 300 is adjustable, and the highest speed is ten thousand revolutions per minute.

[0069] The honeycomb core sub-excavation method of the honeycomb sandwich structure according to the embodiment of the present application, using the honeycomb core sub-excavation device 1 of the honeycomb sandwich structure according to the above embodiment of the present application, comprises the following steps:

[0070] Determine the damage radius and damage depth of the damage area on the honeycomb sandwich structure to be processed;

[0071] Determine the excavation radius and excavation depth of the honeycomb core to be excavated according to the damage radius and the damage depth;

[0072] Grind the skin of the honeycomb sandwich structure according to the excavation radius to expose the honeycomb core to be excavated;

[0073] Select the axial cutting tool with corresponding size according to the excavation radius, and determine the number of sub-tools needed according to the number of honeycomb cells to be cut;

[0074] Move the cutting head above the honeycomb core to be excavated and align it with the honeycomb core to be excavated, so that the sub-tool is aligned with the honeycomb cell;

[0075] Start the axial cutting drive device to rotate the axial cutting tool, lower the cutting head to perform axial cutting on the honeycomb core, and stop the axial cutting drive device when the specified depth is reached. Raise the cutting head by a predetermined distance, which is the axial distance between the lower end of the axial cutting tool and the sub-tool;

[0076] Start the circumferential cutting drive device to rotate the sub-tool to cut the side wall of the honeycomb cell;

[0077] After cutting, the cutting head rises to leave the honeycomb sandwich structure, completing the entire cutting work.

[0078] Specifically, in the step of "selecting the axial cutting tool with corresponding size according to the excavation radius, and determining the number of sub-tools needed according to the number of honeycomb cells to be cut", the cutting head can be replaced as a whole, or only the axial cutting tool can be replaced and the number of sub-tools can be adjusted.

[0079] In the step of "aligning the sub-tool with the honeycomb cell", if the maximum distance between the horizontal edge of the sub-tool 500 and the rotation axis is equal to the circumcircle radius of the honeycomb cell 6 and the sub-tool 500 rotates coaxially with the honeycomb cell 6, the most protruding position of the edge of the sub-tool 500 needs to be aligned with the vertex of the honeycomb cell 6, for example Figure 5 As shown, the vertex of the sub-tool 500 is aligned with the vertex of the honeycomb cell 6 when the sub-tool 500 is triangular.

[0080] By "lifting the cutting head by a predetermined distance, the predetermined distance being an axial distance between the lower end of the axial cutting tool and the sub-tool", the cutting position of the sub-tool 500 in the axial direction of the honeycomb hole 6 can be made consistent with the axial cutting depth of the axial cutting tool 100.

[0081] According to the honeycomb core sub-excavation method of the honeycomb sandwich structure, by using the honeycomb core sub-excavation device 1 of the honeycomb sandwich structure according to the above-mentioned embodiments of the present application, the honeycomb core sub-excavation method has the advantages of low difficulty, high efficiency, good quality, etc. In addition, different sizes of damage can be excavated by replacing the size and number of tools, thereby improving the applicability of the honeycomb core sub-excavation method of the honeycomb sandwich structure.

[0082] Other configurations and operations of the honeycomb core sub-excavation method of the honeycomb sandwich structure according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0083] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0084] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A honeycomb core excavating device for a honeycomb sandwich structure, characterized by, The cutting head comprises: an axial cutting tool which is a cylinder with an open lower end and has a cutting edge at the lower end; an axial cutting drive device which is in driving connection with the axial cutting tool to drive the axial cutting tool to rotate; a circumferential cutting drive device which is arranged in the axial cutting tool and is rotatable relative to the axial cutting tool; a plurality of sub-rotation shafts, each of which has an upper end in driving connection with the circumferential cutting drive device and a lower end extending out of the axial cutting tool; a plurality of sub-cutters which are respectively arranged on the plurality of sub-rotation shafts and rotate with the sub-rotation shafts on which the sub-cutters are arranged, the sub-cutters being located below the axial cutting tool and being adapted to extend into a plurality of honeycomb holes of a honeycomb sandwich structure and to cut side walls of the honeycomb holes when the sub-rotation shafts rotate.

2. The honeycomb core sub-excavation apparatus of claim 1, wherein, The circumferential cutting drive device comprises: a circumferential cutting motor which comprises a motor body and a motor shaft, the motor body of the circumferential cutting motor being arranged in the axial cutting tool and being rotatable relative to the axial cutting tool; a transmission mechanism, the motor shaft of the circumferential cutting motor being in driving connection with the plurality of sub-rotation shafts through the transmission mechanism.

3. The honeycomb core sub-excavation apparatus of claim 1, wherein, The cutting head further comprises an adapter shaft which has an upper half shaft and a lower half shaft, the upper half shaft and the lower half shaft being rotatable relative to each other, the upper half shaft being connected with an inner top surface of the axial cutting tool and the lower half shaft being connected with the circumferential cutting drive device.

4. The honeycomb core sub-excavation apparatus of claim 1, wherein, The maximum distance between the horizontal direction edge of the sub-cutter and the rotation axis of the sub-rotation shaft is equal to the radius of the circumscribed circle of the hexagon of the honeycomb hole.

5. The honeycomb core sub-excavation apparatus of claim 1, wherein, The sub-cutter is triangular in horizontal plane projection.

6. The honeycomb core sub-excavation apparatus of claim 1, wherein, The plurality of sub-rotation shafts are arranged in a regular hexagonal array in the horizontal direction.

7. The honeycomb core sub-excavation apparatus of claim 1, wherein, Further comprising: a base; a mechanical arm which is arranged on the base, the cutting head being arranged on the mechanical arm; a work platform which is adapted to place a honeycomb sandwich structure to be processed, the work platform being arranged on the base.

8. A honeycomb core sub-excavation apparatus according to claim 7, wherein, The axial cutting drive device is an axial cutting motor which comprises a motor body and a motor shaft, the mechanical arm being connected with the motor body of the axial cutting motor and the axial cutting tool being in driving connection with the motor shaft of the axial cutting motor.

9. The honeycomb core sub-excavation apparatus of claim 1, wherein, The sub-cutter is detachably arranged on the sub-rotation shaft, the axial cutting tool is detachably connected with the axial cutting drive device, and the circumferential cutting drive device is detachably arranged in the axial cutting tool.

10. A method of core drilling a honeycomb core of a honeycomb sandwich structure, characterized by, A honeycomb core sub-excavation device for a honeycomb sandwich structure according to any one of claims 1-9 is used, comprising the following steps: determining the damage radius and the damage depth of a damage area on the honeycomb sandwich structure to be processed; determining the excavation radius and the excavation depth of the honeycomb core to be excavated according to the damage radius and the damage depth; polishing the skin of the honeycomb sandwich structure according to the excavation radius to expose the honeycomb core to be excavated; According to the excavation radius, the axial cutting tool is selected with a corresponding size, and the number of the sub-cutters is determined according to the number of the honeycomb holes to be cut; The cutting head is moved to above the honeycomb core to be excavated and is aligned with the honeycomb core to be excavated, so that the sub-cutters are aligned with the honeycomb holes; The axial cutting driving device is started to rotate the axial cutting tool, the cutting head is lowered to axially cut the honeycomb core, and after reaching a specified depth, the axial cutting driving device is turned off, the cutting head is lifted by a predetermined distance, which is the axial distance between the lower end of the axial cutting tool and the sub-cutters; The circumferential cutting driving device is started to rotate the sub-cutters, so that the sub-cutters cut the side wall of the honeycomb hole; After the cutting is completed, the cutting head is lifted to leave the honeycomb sandwich structure, and the whole cutting work is completed.

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