A method for controlling end face grinding damage of an array composite pipe member

Abstract

The application provides a kind of array composite pipe component end face grinding processing damage control method, it is related to plane grinding processing technical field, comprising: using small diameter grinding wheel to preset depth of cut along the material of two rows of composite pipe array W axis direction to each other overlap boundary is carried out cutting processing, preset depth of cut is less than total depth of cut;Using large diameter grinding wheel to remove the remaining material processing, the depth of cut of large diameter grinding wheel is equal to the total depth of cut minus the depth of cut of small diameter grinding wheel S1.The center of small diameter taper grinding wheel is consistent with the center of the material on both sides of the composite pipe at the boundary, thereby indirectly ensuring the consistency of the material removal on both sides in the same cutting path during processing.The material in the area prone to processing defects of the composite pipe array has been removed by the small diameter taper grinding wheel, so the large diameter chamfer grinding wheel is used for grinding processing, which can maximize the processing efficiency under the condition of ensuring the processing quality.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of plane grinding processing, in particular to an array composite pipe component end face grinding processing damage control method. BACKGROUND

[0002] The composite pipe array is composed of a plurality of thin-walled composite cylindrical shells arranged in a special manner, and the basic feature is that six composite pipes with the same diameter are arranged at equal distances and angles around a composite pipe, such as Figure 1 The single unit surrounded by the dashed line hexagon is taken as a reference, and the complete carbon pipe array structure can be mapped through translation. The composite pipe array is a typical honeycomb structure, which has the advantages of high specific strength and specific stiffness, corrosion resistance and the like, and is widely used in the fields of aerospace, vehicles and the like.

[0003] In the application process, the composite pipe array is usually glued as a sandwich with the upper and lower skins, and when the skin has a specific surface shape requirement, the composite pipe array needs to be machined into a matching shape through mechanical machining. Grinding is an ideal machining method for the composite pipe array, a large number of small cutting edges participate in cutting at the same time during grinding, the material removal process is relatively stable, and the grinding force is small, but the end face grinding process of the composite pipe array is prone to produce machining defects such as delamination and tearing, which affect the machining quality. The main reason for the machining defects is that the grinding wheel can be regarded as repeated end face grinding of a single composite pipe when the grinding wheel grinds the end face of the composite pipe array. When the grinding wheel is tangent to the single composite pipe and is about to cut in or cut off the single composite pipe, the material removal rate is extremely high, which is discussed in detail in the manufacturing technology journal (Tian Junchao, Kang Renke et al. Multi-scale machining damages of CFRP circular cell honeycomb during end face machining [J]. Journal of Manufacturing Processes, 2023, 86:282-293.). At the same time, the machining load generated by the periphery of the grinding wheel is borne by the inner wall of the composite pipe, but the stiffness of the inner wall of the composite pipe is poor, so the fiber-matrix interface below the machined surface produces a failure crack and expands, and then produces machining defects such as tearing, and the greater the feed speed, the higher the material removal rate, the more the delamination and tearing, and the worse the machining quality. When the grinding wheel cuts into the composite pipe, the support is enhanced, and the machining damage is not easy to occur.

[0004] In order to control the machining damage, a lower grinding wheel axial cutting depth and a radial feed speed are generally used during machining. However, this greatly wastes the machining time and makes the machining efficiency lower. SUMMARY

[0005] According to the technical problem proposed above, an array composite pipe component end face grinding processing damage control method is provided, which can inhibit damage and ensure high processing efficiency after the grinding wheel cuts in.

[0006] The technical means adopted by the present application are as follows:

[0007] An array composite pipe component end face grinding processing damage control method comprises the following steps:

[0008] S1, a small-diameter grinding wheel is used to cut the material at the boundary of the two rows of composite pipes that overlap each other along the W-axis direction of the composite pipe array at a preset depth, and the preset depth is smaller than the total depth;

[0009] S2, a large-diameter grinding wheel is used to remove the remaining material, and the depth of the large-diameter grinding wheel is equal to the total depth minus the depth of the small-diameter grinding wheel in S1.

[0010] Further, in S1, the small-diameter grinding wheel comprises a conical grinding wheel.

[0011] Further, in S2, the large-diameter grinding wheel is a chamfered grinding wheel.

[0012] Further, in S1, the center of the small-diameter conical grinding wheel is consistent with the center of the composite pipes on both sides of the material at the boundary.

[0013] Further, in S2, during the processing, the large-diameter grinding wheel first feeds along the L direction of the composite pipe array to process the boundary of the composite pipe array, and then removes the "x" shaped boss formed after S1 processing one by one along the W-axis direction and at a certain angle with the W-axis, and the processing is continued until it is finished.

[0014] Further, the angle with the W-axis is specifically 60°.

[0015] Compared with the prior art, the present application has the following advantages: the center of the small-diameter conical grinding wheel is consistent with the center of the composite pipes on both sides of the material at the boundary, thereby indirectly ensuring the consistency of the removal of the materials on both sides under the same cutting path during the processing, and only part of the material is left after the removal is completed. The material in the area prone to processing defects of the composite pipe array relative to the large-diameter chamfered grinding wheel has been removed by the small-diameter conical grinding wheel, so that the large-diameter chamfered grinding wheel can be used for grinding processing under the condition of ensuring the processing quality, thereby maximizing the processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings described in the following embodiments are only some embodiments of the present application, and not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0017] Figure 1 The structure diagram of the composite pipe array.

[0018] Figure 2 The schematic diagram of the small-diameter cone-shaped grinding wheel.

[0019] Figure 3 The single composite pipe schematic diagram in which the small-diameter cone-shaped grinding wheel in step one cuts the material at the boundary of the two rows of composite pipes overlapping each other along the W-axis direction of the composite pipe array.

[0020] Figure 4 The schematic diagram in which the small-diameter cone-shaped grinding wheel in step one cuts the material at the boundary of the two rows of composite pipes overlapping each other along the W-axis direction of the composite pipe array.

[0021] Figure 5 The schematic diagram of the composite pipe array after step one processing.

[0022] Figure 6 The schematic diagram of the large-diameter chamfered grinding wheel cutting the single composite pipe along the L direction of the composite pipe array.

[0023] Figure 7 The schematic diagram of the large-diameter chamfered grinding wheel cutting the remaining material of the composite pipe array along the L direction of the composite pipe array. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0026] It is to be understood that the terms so far as the grammar used herein is concerned are to be interpreted in their dictionary meanings and should not be construed to open down the scope of the present application based on the usage as per se. It is also to be understood that the terminology and description used herein is only by way of explanation of the illustrative embodiments and should not be construed to limit the scope of the present application.

[0027] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application unless otherwise specifically stated. It is also to be understood that the drawings are not necessarily drawn to scale of the actual proportions of the various parts and components shown therein. Techniques, methods, and apparatus known to those of ordinary skill are not discussed in detail because such techniques, methods, and apparatus are considered to be part of the art. All examples shown and discussed herein are intended to be exemplary and non-limiting. Therefore, other examples of the illustrative embodiments can have different values. It is noted that like numbers and letters on the figures identify like parts throughout the disclosure. Therefore, once an item is defined in one figure, it is not necessary to discuss it further in connection with other figures.

[0028] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "upper", "lower", "left", "right", "horizontal", "vertical", and "top" and "bottom" are based on the orientation or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of protection of the present application. The orientation terms "inner" and "outer" refer to the inner and outer relative to the outline of the components themselves.

[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0031] like Figures 1-7 As shown, this embodiment of the invention provides a method for controlling damage during end-face grinding of arrayed composite tube components, specifically including the following steps:

[0032] S1. First, use a small-diameter conical grinding wheel to cut the material at the boundary where the two rows of composite tubes overlap along the W-axis of the composite tube array until all composite tubes have been cut. The main purpose of this step is to avoid machining damage caused by the grinding wheel when it is about to cut or about to finish cutting when using a large-diameter chamfered grinding wheel in step S2. At the same time, the cutting depth in step S2 is less than the total cutting depth, and it is necessary to ensure that the center distance of the small-diameter conical grinding wheel from the center of the composite tubes on both sides of the material at the boundary is consistent. This indirectly ensures the consistency of material removal on both sides under the same cutting path during the machining process. After removal, only a portion of the material is retained.

[0033] Specifically, the connection boundaries of the two rows of composite tubes at the far end of the L-axis direction are cut and machined by a small-diameter conical grinding wheel. After machining one row of connection boundaries, the connection boundaries of the two adjacent rows of composite tubes are machined until all connection boundaries are machined.

[0034] After machining the connection boundary of a single row of composite tube arrays, the tool is retracted to machine the next row of connection boundaries, using reciprocating cutting. Reciprocating cutting improves machining efficiency, but it can easily cause edge chipping in the boundary area. Therefore, a spherical grinding wheel can be used for fine dressing at the edge to reduce stress concentration.

[0035] S2, the remaining material is removed by using a large-diameter chamfering grinding wheel. It should be noted that the depth of cut in step one is smaller than the depth of cut, and when the large-diameter chamfering grinding wheel is used for processing, the depth of cut in step two should be equal to the total depth of cut minus the depth of cut in step one, so as to meet the requirements of material removal of the composite tube array. In order to reduce the processing damage, the chamfer height of the large-diameter chamfering grinding wheel is greater than the depth of cut in this step, so as to ensure that the remaining material is removed by the conical surface of the grinding wheel. Since a small part of the material on the boundary between the two rows of composite tubes along the W axis of the composite tube array has been removed in step one, that is, the material in the area prone to processing defects of the composite tube array has been removed by the small-diameter conical grinding wheel, so the large-diameter chamfering grinding wheel can be used for grinding processing to maximize the processing efficiency under the condition of ensuring the processing quality;

[0036] In order to improve the material removal rate of the large-diameter chamfering grinding wheel during processing, the characteristics of the surface to be processed after the removal of the connection boundary of the composite tube array are analyzed, and it is found that the remaining processing area has obvious distribution regularity, and the material to be removed is mainly concentrated in the direction of sixty degrees with the W axis. Therefore, the large-diameter chamfering grinding wheel is first fed along the L direction of the composite tube array to process the boundary of the composite tube array, and then the "x" shaped boss is removed one by one along the direction of sixty degrees with the W axis, and the processing is completed.

[0037] During the processing of the large-diameter chamfering grinding wheel, the distance between the tool tracks is the projection distance of the center distance of adjacent tubes along the direction of thirty degrees with the W axis. Each time the tool is fed, the cutting of one row of composite tubes can be completed, so as to ensure high processing efficiency. It should be noted that under this path, the grinding wheel can remove all the materials to be processed under the path in one cutting process, so as to avoid the generation of secondary cutting process.

[0038] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling damage during end-face grinding of arrayed composite tube components, characterized in that, Includes the following steps: S1. Using a small-diameter grinding wheel, the material at the boundary where the two rows of composite tubes overlap is cut along the W-axis direction of the composite tube array to a preset depth of cut, wherein the preset depth of cut is less than the total depth of cut. S2. Use a large-diameter grinding wheel to remove the remaining material. The depth of cut of the large-diameter grinding wheel is equal to the total depth of cut minus the depth of cut of the small-diameter grinding wheel in S1. In S1, the small-diameter grinding wheel includes a conical grinding wheel; In S2, the large-diameter grinding wheel is a grinding wheel with a chamfer; In S1, the center of the small-diameter conical grinding wheel is at the same distance from the center of the composite tubes on both sides of the boundary.

2. The method for controlling damage during end-face grinding of array composite tube components according to claim 1, characterized in that, In S2, during the processing, the large-diameter grinding wheel first feeds along the L direction of the composite tube array to process the boundary of the composite tube array, and then removes the "x" shaped bosses formed after processing in S1 one by one along the W axis direction at a certain angle to the W axis until the processing is completed.

3. The method for controlling damage during end-face grinding of array composite tube components according to claim 2, characterized in that, The angle between the axis and the W axis is 60°.

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