A method for detecting the applicability of an ultrasonic machining process for a honeycomb core material

Abstract

This application discloses a suitability testing method for ultrasonic machining of honeycomb core materials, belonging to the field of honeycomb core material machining technology. The suitability testing method includes: determining the critical conditions of the process based on material properties and quality requirements; establishing a mapping relationship between material parameters and cutting forces and inversely calculating the critical cutting force; subsequently calculating the motion state and impact force of the tool under ultrasonic vibration; and finally, determining whether ultrasonic machining can be used based on the comparison between tool displacement and material fracture limit, and impact force and critical cutting force. This application can quickly determine the suitability of ultrasonic machining for new material honeycomb core parts without requiring extensive trial cutting experiments, effectively saving time and costs, and improving the application efficiency and accuracy of parameter determination of ultrasonic processes.

Description

Technical Field

[0001] This application belongs to the field of honeycomb core material processing technology, and more specifically, relates to a method for testing the suitability of ultrasonic processing technology for honeycomb core materials. Background Technology

[0002] Honeycomb core materials have been widely used in aerospace, high-speed rail, and shipbuilding due to their excellent specific strength and specific stiffness. When manufacturing such composite components, the honeycomb core must first undergo machining processes such as milling or cutting. The quality of this machining directly determines the final component's molding quality and service life. Currently, the main machining processes for honeycomb cores are high-speed milling and ultrasonic machining. Among these, ultrasonic machining technology, with its significant advantages such as low cutting force, high surface quality, and no dust pollution, is gradually becoming the ideal choice for honeycomb core processing.

[0003] However, there are many types of honeycomb core materials, including aramid paper honeycomb, aluminum honeycomb, and titanium honeycomb, and different grades of materials differ in core cell size, wall thickness, and mechanical properties. Current process development typically relies on traditional trial-and-error methods, which involve conducting numerous trial cuts for each new material or grade to verify the feasibility of ultrasonic processing and to determine the appropriate parameters. This method is not only time-consuming and labor-intensive, significantly increasing the initial manpower and equipment costs, but also prone to misjudgment due to the numerous variables in the processing parameters. Inappropriate parameter design can easily lead to misjudgments, making it difficult to accurately assess whether the material is truly suitable for ultrasonic processing.

[0004] Therefore, there is an urgent need for a theoretical method that can quickly and accurately determine whether honeycomb core materials are suitable for ultrasonic processing based on material properties and geometric characteristics. Summary of the Invention

[0005] The purpose of this application is to provide a method for testing the suitability of ultrasonic processing technology for honeycomb core materials. This method can determine the parameters that can cause the material to fracture through ultrasonic processing by considering the material properties and the characteristics of the honeycomb geometry, thus providing a reference for determining the ultrasonic processing parameters for different honeycomb core materials.

[0006] To achieve the above objectives, this application provides a method for testing the suitability of ultrasonic processing technology for honeycomb core materials, comprising the following steps: Based on the characteristics of the honeycomb core material and the processing quality requirements, the critical conditions for ultrasonic processing based on processing quality constraints are determined; Establish the mapping relationship between honeycomb core material parameters and cutting force; Based on the critical conditions and mapping relationship of ultrasonic processing, the critical cutting force that meets the processing quality requirements is obtained by inverse solution; The motion state and impact force of the tool under ultrasonic vibration are calculated based on the set process parameters. Based on the motion state of the cutting tool and the comparison between the impact force and the critical cutting force, it is determined whether the honeycomb core material can be processed using ultrasonic machining.

[0007] Furthermore, the critical conditions for ultrasonic processing with quality constraints include: Core lattice deformation constraint: When the core lattice deforms, the maximum deformation displacement is less than a preset threshold. e 0; Burr constraint: When burrs appear in the core, the burr height or width must be less than a preset threshold. h 0; Tear constraint: When a tear occurs in the lattice, the length of a single tear is less than a preset threshold. l 0.

[0008] Furthermore, the mapping relationship between the honeycomb core material parameters and the cutting force is established, including: Using the finite element method, the maximum deformation displacement was established respectively. E Maximum burr height or width H Maximum single-point tear length L With material parameters c i and cutting force F Mapping relationship between them: , as well as .

[0009] Furthermore, the motion state of the tool under ultrasonic vibration is calculated based on the set process parameters, including the following steps: Let the tool feed rate be... v f The ultrasonic amplitude is A x The frequency is f The vibration period is T ,but, The displacement of the tool in the X direction is , 0≤t≤T ;but, The speed of the tool in the X direction is ;but, The acceleration of the cutting tool in the X direction is: .

[0010] Furthermore, the suitability testing method also includes determining the characteristic moments of intermittent cutting, wherein the characteristic moments include the moments when the tool penetrates the material to the deepest point. t 1. Determine the moment when the tool separates from the workpiece. t 2. The moment when the tool re-contacts the workpiece t 3.

[0011] Furthermore, the characteristic moments of intermittent cutting are determined, including: Determining the characteristic moments of intermittent cutting includes: Solving the equations using numerical analysis Determine the moment when the tool penetrates the material to its deepest point. t 1; Solving the system of equations using numerical analysis Determine the moment when the tool separates from the workpiece. t 2 and the moment of re-contact t 3.

[0012] Furthermore, based on the motion state of the cutting tool and the comparison between the impact force and the critical cutting force, it is determined whether the honeycomb core material can be processed using ultrasonic machining. The criteria for this determination include: Calculate the deepest displacement at the moment when the tool penetrates the material to its deepest point. s 1. If s 1 is greater than the material's fracture limit deformation. d With honeycomb core wall thickness b the sum of t Impact force at moment 1 F 1 less than the critical cutting force F If the value is 0, then the honeycomb core material can be processed using ultrasonic technology. Otherwise, it is determined that ultrasonic processing cannot be used or that process parameters need to be adjusted.

[0013] Furthermore, impact force F The calculation of 1 is based on the momentum theorem, which satisfies... ,in M For the equivalent mass of the cutting tool, a x For tool acceleration; And taking energy dissipation factors into account, the actual cutting force is established. With impact force Mapping relationship between .

[0014] Furthermore, before determining the critical conditions of the ultrasonic process based on processing quality constraints, the process also includes: making a preliminary judgment on the types of processing defects that may occur based on the type of honeycomb core material; wherein the types of processing defects include core deformation, burrs or tears.

[0015] In summary, this application has the following advantages: This application provides a suitability testing method for ultrasonic processing of honeycomb core materials. Its core principle is a process judgment method based on theoretical calculations, which can effectively and quickly determine whether new material honeycomb core parts can be processed using ultrasonic processing. This method can replace the traditional approach that relies on numerous trial cuts to verify process feasibility, significantly saving the time, manpower, and equipment costs required for preliminary preparation. This greatly improves the application efficiency and R&D cycle of ultrasonic technology in the processing of new material honeycomb core parts.

[0016] This application not only assesses the feasibility of a process but also, based on material properties and structural characteristics, reverse-engineers and determines applicable ultrasonic processing parameters (such as amplitude and frequency). This solves the processing quality problems caused by unreasonable processing parameter design, provides process engineers with valuable quantitative parameter data, and avoids the blind selection of parameters.

[0017] Furthermore, the ultrasonic process critical conditions for processing quality constraints proposed in this application establish a universal evaluation system that can cover different types of honeycomb core materials such as aramid paper, aluminum, and titanium, and adapt to constraints on various defect indicators such as core deformation, burrs, and tearing. Therefore, the method in this application is applicable to processing scenarios with various material properties and different grades of honeycomb cores, and has strong engineering application value and promotional significance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of ultrasonic-assisted processing of honeycomb cores using a dagger, as proposed in an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the burr height-cutting force mapping relationship proposed in the embodiments of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Honeycomb sandwich components consist of a honeycomb core and upper and lower skins. Compared to traditional metal materials, they possess extremely high specific strength and specific stiffness, achieving significant enhancements in strength and stiffness with minimal weight increase. Therefore, honeycomb sandwich components are widely used in shipbuilding, aviation, aerospace, and high-speed rail transportation. Before assembling honeycomb sandwich components, the honeycomb core material typically requires machining, such as milling and cutting. The quality of this machining directly determines the forming quality and service life of the honeycomb sandwich component.

[0023] Currently, honeycomb core materials are mostly processed using high-speed milling or ultrasonic machining. Compared to high-speed milling, ultrasonic machining offers advantages such as reduced cutting forces, improved surface quality, and no dust pollution. However, honeycomb cores can be classified into various types based on materials, including aramid paper honeycomb, aluminum honeycomb, and titanium honeycomb. Furthermore, differences in core cell size and honeycomb wall thickness can result in different grades of the same material. In current process development, determining the suitability of ultrasonic machining for each grade of honeycomb core using traditional experimental verification methods is not only time-consuming and labor-intensive but also introduces the variable of machining parameters, which can easily lead to erroneous conclusions due to unreasonable parameter design. The lack of a theoretical judgment method based on material properties and geometric characteristics makes it difficult to quickly determine the applicability and parameter range of ultrasonic machining without extensive trial cutting.

[0024] In ultrasonic machining, dagger cutters are typically used for contour machining and cutting, while disc cutters are used for surface milling. This application analyzes the dagger cutter process, focusing on the cyclical contact and separation between the tool and workpiece during the machining of honeycomb cores—a process characterized by intermittent cutting. Intermittent cutting effectively reduces the cutting force required for material fracture, resulting in better machining quality. Therefore, this application proposes a method for determining whether honeycomb core materials can be ultrasonically machined, considering the interaction between the dagger cutter and the honeycomb core workpiece under intermittent cutting conditions. This method uses material properties and honeycomb geometry to determine the parameters that would cause material fracture during ultrasonic machining, thus providing a reference for determining ultrasonic machining parameters for different honeycomb core materials.

[0025] Specifically, this application provides a method for testing the suitability of ultrasonic processing technology for honeycomb core materials, including the following steps: S1. Based on the characteristics of the honeycomb core material and the processing quality requirements, determine the critical conditions of the ultrasonic process based on processing quality constraints.

[0026] In a specific implementation, before determining the critical conditions of the ultrasonic process based on processing quality constraints, the method further includes: preliminarily judging the types of processing defects that may occur based on the type of honeycomb core material; wherein, the types of processing defects include core cell deformation, burrs, or tearing. Core cell deformation refers to the hexagonal deformation of a portion of the honeycomb core material under stress during cutting, resulting in collapse, twisting, or local compression; burrs are strip-shaped or sheet-like residual material left in the honeycomb wall after processing, which leads to a decrease in surface quality; tearing refers to non-uniform breakage of the processed edge, resulting in sheet-like peeling or fiber peeling processing damage.

[0027] The honeycomb core materials in this application include various types such as aramid paper honeycomb, aluminum honeycomb, and titanium honeycomb.

[0028] In a specific implementation, the ultrasonic process critical conditions for processing quality constraints include: (1) Core lattice deformation constraint: when the core lattice deforms, the maximum deformation displacement is less than a preset threshold. e 0. That is, when the core lattice deforms, and the maximum deformation displacement is less than 0. e When the value is 0, the processing quality requirements are considered to be met. (2) Burr constraint: When burrs appear in the core, the burr height or width is less than the preset threshold. h 0, meaning that when burrs appear in the core lattice, and the burr height or width is less than 0. h When the value is 0, the processing quality requirements are considered to be met. (3) Tear constraint: When a tear occurs in the core lattice, the tear length at a single point is less than the preset threshold. l 0, meaning that when a tear occurs in the lattice, and the length of a single tear is less than 0. l When the value is 0, the processing quality requirements are considered met.

[0029] S2. Establish the mapping relationship between the honeycomb core material parameters and the cutting force.

[0030] In a specific implementation, the mapping relationship between the honeycomb core material parameters and the cutting force is established, including: using the finite element method to establish the maximum deformation displacement. E Maximum burr height or width H Maximum single-point tear length L With material parameters c i and cutting force F Mapping relationship between them: , as well as .

[0031] S3. Based on the critical conditions and mapping relationship of ultrasonic processing, the critical cutting force that meets the processing quality requirements is obtained by inverse solution.

[0032] S4. Calculate the motion state and impact force of the tool under ultrasonic vibration based on the set process parameters.

[0033] In a specific implementation, the motion state of the tool under ultrasonic vibration is calculated based on the set process parameters, including the following steps: Assuming the tool feed rate is... v f The ultrasonic amplitude is A x The frequency is f The vibration period is T Therefore, within one vibration cycle, the displacement of the tool in the X direction is: , 0≤t≤T Therefore, by differentiating, we can obtain the velocity of the tool in the X direction as: Then, further differentiation yields the acceleration. Since the tool is fed at a constant speed, the actual acceleration is... .

[0034] S5. Based on the motion state of the tool and the comparison between the impact force and the critical cutting force, determine whether the honeycomb core material can be processed using ultrasonic machining.

[0035] In a specific implementation, the suitability of the honeycomb core material for ultrasonic machining is determined based on the motion state of the cutting tool and the comparison between the impact force and the critical cutting force. The determination criteria include: calculating the deepest displacement at the moment when the cutting tool penetrates the material to its deepest point. s 1. If s 1 is greater than the material's fracture limit deformation. d With honeycomb core wall thickness b the sum of t Impact force at moment 1 F 1 less than the critical cutting force F If the value is 0, it is determined that the honeycomb core material can be processed using ultrasonic technology; otherwise, it is determined that it cannot be processed using ultrasonic technology or that the process parameters need to be adjusted.

[0036] In a specific implementation, the applicability testing method further includes determining the characteristic moments of intermittent cutting, wherein the characteristic moments include the moment when the tool penetrates the material to the deepest point. t 1. Determine the moment when the tool separates from the workpiece. t 2. The moment when the tool re-contacts the workpiece t 3. That is, due to the periodic vibration of the tool under ultrasonic action, the cutting between the tool and the workpiece is intermittent, in... t At time 1, the velocity of the tool in the X direction The tool penetrates the material to its deepest point; at this point, the depth of penetration is... ; t 1~ t At time 2, the blade stops cutting until... t Separation from the workpiece at time 2; t 2~ t At time 3, the tool is not in contact with the workpiece until...t At time 3, re-engage and begin cutting the workpiece.

[0037] In a specific implementation, determining the characteristic moments of intermittent cutting includes: solving equations through numerical analysis. Determine the moment when the tool penetrates the material to its deepest point. t 1. Solving the system of equations through numerical analysis Determine the moment when the tool separates from the workpiece. t 2 and the moment of re-contact t 3.

[0038] In a specific implementation, the impact force F The calculation of 1 is based on the momentum theorem, which satisfies... ,in M For the equivalent mass of the cutting tool, a x Given the tool acceleration and considering energy dissipation factors, establish the actual cutting force. With impact force Mapping relationship between .

[0039] In summary, step S1 in this application quantifies processing defects (such as burr height and tear length), transforming the vague concept of good processing quality into specific physical quantity thresholds (critical conditions), thus providing a judgment standard for subsequent mechanical calculations. Due to the complexity of the honeycomb core structure (hexagonal mesh), it is difficult to describe the relationship between cutting force and defects using simple analytical formulas. Therefore, step S2 is based on computational mechanics (finite element analysis, FEA), using the finite element method to simulate the cutting process and establish inputs (material parameters). c i Cutting force F ) and output (deformation amount) E Burr height H The nonlinear mapping function (etc.) essentially constructs a virtual physical process model. Step S3, based on reverse engineering and reverse solving, calculates the maximum allowable input (cutting force) given the known quality target (threshold in S1) and physical model (mapping relationship in S2). F That is, to solve for the maximum force that the tool can withstand without exceeding the limit. Step S4, firstly, derives the displacement, velocity, and acceleration equations by superimposing the uniform feed motion of the tool with sinusoidal ultrasonic vibration, accurately describing the spatial position of the tool at any given moment. Step S4, secondly, uses the momentum theorem (… F=ma The vibration acceleration of the cutting tool is converted into an impact force on the workpiece. Finally, the moments of contact and separation between the cutting tool and the workpiece are solved using the velocity equation. t 1 ,t 2 ,t3) This reflects the unique high-frequency intermittent impact characteristics of ultrasonic processing. Step S5 determines whether the honeycomb core material can be processed using ultrasonic processing based on strength theory and fracture criteria. The fracture criteria include comparing the maximum depth of cut. s 1. Material fracture limit d+b To determine if the cutting tool has sufficient energy to cut the material. Strength criterion: compare the actual impact force. F 1 and critical cutting force F 0. Determine whether the processing will produce defects exceeding the allowable range. Only when both the fracture and strength criteria are met can the process be deemed applicable, meaning ultrasonic processing can be used to process the honeycomb core material. That is, if... F 1< F 0 and s 1> d+b This indicates that the energy provided by the process parameters is sufficient to cut the material without causing damage (quality meets standards). If the judgment is not applicable, the engineer can work backwards from the formula in step S4 (e.g., adjusting the amplitude). A or frequency f ) to change F 1 and s 1. Continue until the conditions of step S5 are met, thereby directly guiding the optimization design of process parameters.

[0040] The technical solutions described above in this application will be explained in detail below with reference to specific embodiments.

[0041] Example 1 This embodiment provides a method for testing the applicability of ultrasonic processing technology for aramid paper honeycomb core materials. Aramid paper honeycomb materials exhibit significant brittle fracture characteristics before fracture, making them more prone to burr generation during processing. Using the finite element method to simulate the processing of aramid paper honeycomb core materials, the mapping relationship between burr height and cutting force can be obtained (e.g., ...). Figure 2 (as shown) h=H(F) Based on actual processing requirements, the burr height should not exceed [the specified value]. h A surface finish of 0.01 mm is considered to meet the machining surface quality requirements. The corresponding critical cutting force is assumed to be... F 0 = 50N.

[0042] Case 1: Given the material wall thickness and ultrasonic processing parameters, determine whether ultrasonic processing can be used. Assuming that when a dagger is used to process aramid paper honeycomb, the cutter enters the honeycomb core wall, the force is applied at the midpoint of the honeycomb wall, and the wall thickness is... mm, fracture limit deformation mm.

[0043] Processing parameters include: when processing aramid paper honeycomb using a dagger (e.g.) Figure 1 As shown), assuming the tool rake angle Tool feed rate mm / s, ultrasonic amplitude 0.1mm, frequency Hz, period s, equivalent mass of the dagger g.

[0044] Calculations using the formula show that... s. During the first cycle, the moment when the tool penetrates the material to its deepest point occurs... At that moment, the solution is obtained s.

[0045] Displacement at this time mm, acceleration m / s 2 Impact N.

[0046] The comparison shows that: , Therefore, it can be determined that at the tool rake angle... Tool feed rate mm / s, ultrasonic amplitude 0.1mm, frequency Hz, equivalent mass of dagger Under the process parameters g, the wall thickness The aramid paper honeycomb core of mm can be processed using ultrasonic technology, and the burrs on the processed parts meet the surface quality requirements.

[0047] In summary, Case 1 established a complete parameter system for process parameters (amplitude, frequency, feed, etc.) and material parameters (wall thickness), through a standard process (including displacement calculation). and impact force The study successfully verified that the honeycomb core material could be ultrasonically processed under these conditions and that its quality was up to standard.

[0048] Case 2: Given the ultrasonic processing parameters for the material, determine the thickness of the honeycomb wall beyond which ultrasonic processing cannot be used. As can be seen from Case 1, at the tool rake angle Tool feed rate mm / s, ultrasonic amplitude 0.1mm, frequency Hz, equivalent mass of dagger Under process parameters g, when the wall thickness of the aramid paper honeycomb core is g mm, fracture limit deformation When mm, it cannot be satisfied .

[0049] In summary, Case 2 kept the process parameters unchanged (i.e., kept the tooling, vibration, and feed conditions exactly the same as in Case 1), and only changed the material properties (increasing the wall thickness). b ), until the cut-off condition ( The condition is no longer met. This pushes the processability in Case 1 to the point of no longer being processable, demonstrating that this method can define the maximum processable material wall thickness (i.e., the equipment capability limit) under specific process parameters.

[0050] (3) Given the material wall thickness and other ultrasonic process parameters, determine the minimum amplitude required for ultrasonic processing. As can be seen from Case 1, at the tool rake angle Tool feed rate mm / s, frequency Hz, equivalent mass of dagger g's process parameters, wall thickness mm, fracture limit deformation Given material parameters in mm, the following conditions must be met: The solution can be obtained by Newton's iterative method. s, mm, verify the solution 2.7N, meets the requirements Therefore, the minimum amplitude required for ultrasonic processing is [value missing]. mm.

[0051] In summary, Case 2 revealed the problem of being unable to cut the material due to excessive wall thickness, while Case 3, based on the material in Case 1 (or for a specific wall thickness), deduced the minimum amplitude required to meet the cutting and quality requirements. This demonstrates that the detection method of this application can transform from a technical level of assessing the current situation to a technical level of guiding design. It shows that this method can not only determine whether ultrasonic processing of honeycomb core workpieces is feasible, but also calculate the processing parameters for ultrasonic processing of honeycomb core workpieces.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0054] Finally, it should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0055] This application uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for testing the suitability of ultrasonic processing technology for honeycomb core materials, characterized in that, Includes the following steps: Based on the characteristics of the honeycomb core material and the processing quality requirements, the critical conditions for ultrasonic processing based on processing quality constraints are determined; Establish the mapping relationship between honeycomb core material parameters and cutting force; Based on the ultrasonic process critical conditions and the mapping relationship, the critical cutting force that meets the processing quality requirements is obtained by inverse solution; The motion state and impact force of the tool under ultrasonic vibration are calculated based on the set process parameters. Based on the motion state of the cutting tool and the comparison between the impact force and the critical cutting force, it is determined whether the honeycomb core material can be processed using ultrasonic machining.

2. The suitability testing method for ultrasonic processing of honeycomb core materials according to claim 1, characterized in that, The critical conditions for ultrasonic processing that constrain the quality of the machining include: Core lattice deformation constraint: When the core lattice deforms, the maximum deformation displacement is less than a preset threshold. ε 0; Burr constraint: When burrs appear in the core, the burr height or width must be less than a preset threshold. h 0; Tear constraint: When a tear occurs in the lattice, the length of a single tear point is less than a preset threshold. l 0.

3. The method for testing the suitability of ultrasonic processing technology for honeycomb core materials according to claim 1, characterized in that, The establishment of the mapping relationship between the honeycomb core material parameters and the cutting force includes: Using the finite element method, the maximum deformation displacement was established respectively. E Maximum burr height or width H Maximum single-point tear length L With material parameters c i and cutting force F Mapping relationship between them: , as well as .

4. The method for testing the suitability of ultrasonic processing technology for honeycomb core materials according to claim 1, characterized in that, The calculation of the tool's motion state under ultrasonic vibration based on the set process parameters includes the following steps: Let the tool feed rate be... v f The ultrasonic amplitude is A x The frequency is f The vibration period is T ,but, The displacement of the tool in the X direction is , 0≤t≤T ;but, The speed of the tool in the X direction is ;but, The acceleration of the cutting tool in the X direction is: .

5. The suitability testing method for ultrasonic processing of honeycomb core materials according to claim 4, characterized in that, The suitability testing method further includes determining the characteristic moments of intermittent cutting, wherein the characteristic moments include the moments when the tool penetrates the material to the deepest point. t 1. Determine the moment when the tool separates from the workpiece. t 2. The moment when the tool re-contacts the workpiece t 3.

6. The method for testing the suitability of ultrasonic processing technology for honeycomb core materials according to claim 5, characterized in that, The determination of the characteristic moments of intermittent cutting includes: Solving the equations using numerical analysis Determine the moment when the tool penetrates the material to its deepest point. t 1; Solving the system of equations using numerical analysis Determine the moment when the tool separates from the workpiece. t 2 and the moment of re-contact t 3.

7. The method for testing the suitability of ultrasonic processing technology for honeycomb core materials according to claim 1, characterized in that, The determination of whether the honeycomb core material can be processed using ultrasonic machining is based on a comparison between the motion state and impact force of the cutting tool and the critical cutting force. The determination criteria include: Calculate the deepest displacement at the moment when the tool penetrates the material to its deepest point. s 1. If s 1 is greater than the material's fracture limit deformation. δ With honeycomb core wall thickness b the sum of t Impact force at moment 1 F 1 less than the critical cutting force F If the value is 0, then the honeycomb core material can be processed using ultrasonic technology. Otherwise, it is determined that ultrasonic processing cannot be used or that process parameters need to be adjusted.

8. The method for testing the suitability of ultrasonic processing technology for honeycomb core materials according to claim 7, characterized in that, The impact force F The calculation of 1 is based on the momentum theorem, which satisfies... ,in M For the equivalent mass of the cutting tool, a x For tool acceleration; And taking energy dissipation factors into account, the actual cutting force is established. With impact force Mapping relationship between .

9. The method for testing the suitability of ultrasonic processing technology for honeycomb core materials according to claim 1, characterized in that, Before determining the critical conditions for ultrasonic processes based on machining quality constraints, the following steps are also included: Based on the type of honeycomb core material, the types of processing defects that may occur are initially determined; wherein, the types of processing defects include core cell deformation, burrs or tears.

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