Double-tip-angle drill bit design method, double-tip-angle drill bit, device, medium and equipment

Abstract

The invention discloses a double-tip-angle drill bit design method, a double-tip-angle drill bit, a device, a medium and equipment, and relates to the technical field of composite material machining.The method includes the steps that firstly, by researching the mapping relation between the size of the tip angle of the drill bit and the maximum edge breakage diameter and the service life of the drill bit, the influences of the tip angle on the edge breakage and the service life of the drill bit are determined; secondly, under the condition that constraint conditions are set, the ranges of the two tip angles of the double-tip-angle drill bit are determined according to the mapping relation, then test screening is conducted by combining the tip angles, and the drill bit angle combination with the longest service life within the maximum edge breakage diameter range allowed by machining is determined; and finally, other geometric parameters of the drill bit are calculated in combination with the designed drill bit diameter, design of the double-tip-angle drill bit is completed, the drill bit is used for drilling the fiber-reinforced hard and brittle composite material, the high strength of a drill tip can be kept, meanwhile, the axial force generated when an outlet is drilled can be effectively reduced, and by improving the drill bit structure, the service life of the drill bit is prolonged. The edge breakage problem is effectively restrained under the condition that technological parameters are not changed, and the hole forming quality is greatly improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of composite material machining, in particular to a double-top-angle drill bit design method, a double-top-angle drill bit, a device, a medium and equipment. BACKGROUND

[0002] Fiber-reinforced hard-brittle composite material is a kind of difficult-to-machine composite material with fibers as the reinforcing phase and hard-brittle material as the matrix phase. During drilling, the material to be removed on the outlet side is simultaneously subjected to axial force and radial force when the drill bit drills to the outlet. Due to the characteristics of the fiber-reinforced hard-brittle composite material, when subjected to a large axial force, the fiber-reinforced hard-brittle composite material generates defects such as edge collapse, which easily leads to a decrease in the quality of the hole and does not meet the design requirements. SUMMARY

[0003] The main purpose of the application is to provide a double-top-angle drill bit design method, a double-top-angle drill bit, a device, a medium and equipment, aiming to solve the problem of low quality of hole making for fiber-reinforced hard-brittle composite material in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the application are as follows: In a first aspect, the embodiments of the application provide a double-top-angle drill bit design method applied to hole making for fiber-reinforced hard-brittle composite material, including the following steps: Obtaining a first mapping relationship and a second mapping relationship according to drilling test cutting tests of different top-angle sizes; wherein the first mapping relationship is a mapping relationship between the top-angle size and the maximum edge collapse diameter, and the second mapping relationship is a mapping relationship between the top-angle size and the service life of the drill bit; Under the constraint conditions of the edge collapse diameter and the service life of the drill bit, obtaining an angle selection range of the first top-angle and the second top-angle according to the first mapping relationship and the second mapping relationship; Selecting a first top-angle and a second top-angle combination in the angle selection range for testing to obtain maximum edge collapse diameter data and drill bit service life data under different angle combinations; In the maximum edge collapse diameter data meeting the processing requirements, determining a target top-angle combination according to the maximum drill bit service life data; According to the target top-angle combination and the designed drill bit diameter, obtaining the geometric parameters of the drill bit to complete the design of the drill bit.

[0005] In a possible implementation manner of the first aspect, the first mapping relationship and the second mapping relationship are obtained according to the drilling test cutting tests of different top-angle sizes, including: Obtaining a plurality of top-angle data and corresponding first maximum edge collapse diameter data and first drill bit service life data according to the drilling test cutting tests of different top-angle sizes; According to the target fitting function, the plurality of top corner angle data and the first maximum collapse edge diameter data are fitted respectively, and the plurality of top corner angle data and the first drill bit service life data are fitted respectively, to obtain the first mapping relationship and the second mapping relationship.

[0006] In a possible implementation manner of the first aspect, before the plurality of top corner angle data and the first maximum collapse edge diameter data are fitted according to the target fitting function, and the plurality of top corner angle data and the first drill bit service life data are fitted according to the target fitting function, to obtain the first mapping relationship and the second mapping relationship, the method further includes: According to fitting of the same data according to a plurality of different fitting functions, the fitting function with the largest determination coefficient is determined as the target fitting function.

[0007] In a possible implementation manner of the first aspect, before the plurality of top corner angle data and the first maximum collapse edge diameter data are fitted according to the target fitting function, and the plurality of top corner angle data and the first drill bit service life data are fitted according to the target fitting function, to obtain the first mapping relationship and the second mapping relationship, the method further includes: According to the plurality of top corner angle data and the first maximum collapse edge diameter data, and the plurality of top corner angle data and the first drill bit service life data, a scatter plot is drawn respectively; According to the target fitting function, the plurality of top corner angle data and the first maximum collapse edge diameter data are fitted respectively, and the plurality of top corner angle data and the first drill bit service life data are fitted respectively, to obtain the first mapping relationship and the second mapping relationship, including: According to the target fitting function, the plurality of top corner angle data and the first maximum collapse edge diameter data are fitted respectively, and the plurality of top corner angle data and the first drill bit service life data are fitted respectively, to obtain the first mapping relationship and the second mapping relationship, including:

[0008] In a possible implementation manner of the first aspect, according to the target top corner angle combination and the designed drill bit diameter, the drill bit geometric parameters are obtained to complete the drill bit design, including: According to the target top corner angle combination and the designed drill bit diameter, a range of drill tip height is obtained; According to the machining influence factor, the drill tip height is determined in the range of drill tip height; According to the drill tip height, the target top corner angle combination and the designed drill bit diameter, the first main cutting edge width is obtained to complete the drill bit design.

[0009] In a possible implementation manner of the first aspect, before the drill bit geometric parameters are obtained according to the target top corner angle combination and the designed drill bit diameter to complete the drill bit design, the method further includes: According to the tool diameter that can be clamped by the main shaft and the drilling process requirement, the designed drill bit diameter is determined.

[0010] In the second aspect, the embodiments of the present application provide a double-top corner angle drill bit, which is obtained by using the double-top corner angle drill bit design method provided in any one of the first aspect.

[0011] In a third aspect, the embodiments of the present application provide a double-point-angle drill bit design device, applied to hole making of fiber-reinforced hard and brittle composite materials, comprising: a mapping module, configured to obtain a first mapping relationship and a second mapping relationship according to drilling test cutting tests of different point angles; wherein the first mapping relationship is a mapping relationship between the point angle size and the maximum edge collapse diameter, and the second mapping relationship is a mapping relationship between the point angle size and the drill bit service life; a constraint module, configured to obtain an angle selection range of a first point angle and a second point angle according to the first mapping relationship and the second mapping relationship under the edge collapse diameter constraint condition and the drill bit service life constraint condition; a combination module, configured to select a first point angle and a second point angle combination in the angle selection range for testing to obtain maximum edge collapse diameter data and drill bit service life data under different angle combinations; a determination module, configured to determine a target point angle combination according to the maximum drill bit service life data in the maximum edge collapse diameter data meeting the processing requirements; a design module, configured to obtain drill bit geometric parameters to complete the drill bit design according to the target point angle combination and a designed drill bit diameter.

[0012] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, storing a computer program, and the computer program is loaded and executed by a processor to implement the double-point-angle drill bit design method provided in any one of the first aspect.

[0013] In a fifth aspect, the embodiments of the present application provide an electronic device, comprising a processor and a memory, wherein, the memory is configured to store a computer program; the processor is configured to load and execute the computer program to enable the electronic device to perform the double-point-angle drill bit design method provided in any one of the first aspect.

[0014] Compared with the prior art, the beneficial effects of the present application are: The method comprises the following steps: obtaining a first mapping relationship and a second mapping relationship according to drilling test cutting of different top corner angles; wherein the first mapping relationship is a mapping relationship between the top corner angle size and the maximum edge collapse diameter, and the second mapping relationship is a mapping relationship between the top corner angle size and the service life of the drill bit; under the constraint conditions of the edge collapse diameter and the service life of the drill bit, the angle selection range of the first top corner angle and the second top corner angle is obtained according to the first mapping relationship and the second mapping relationship; the first top corner angle and the second top corner angle are selected in the angle selection range to perform test cutting, and the maximum edge collapse diameter data and the service life data of the drill bit under different angle combinations are obtained; the target top corner angle combination is determined according to the maximum service life data of the drill bit in the maximum edge collapse diameter data meeting the machining requirements; and the geometric parameters of the drill bit are obtained according to the target top corner angle combination and the designed drill bit diameter to complete the design of the drill bit.

[0015] The application first determines the influence of the top corner angle on the edge collapse and the service life of the drill bit by studying the mapping relationship between the top corner angle size and the maximum edge collapse diameter and the service life of the drill bit, then determines the range of the two top corner angles of the double-top corner drill bit according to the mapping relationship under the constraint conditions, then determines the longest service life drill angle combination in the maximum edge collapse diameter range allowed by machining through test screening of the combined top corner angles, and finally calculates other geometric parameters of the drill bit in combination with the designed drill bit diameter to complete the design of the double-top corner drill bit. The double-top corner drill bit is used for drilling holes in the fiber-reinforced hard and brittle composite material, can effectively reduce the axial force when drilling out while maintaining high strength of the drill tip, effectively suppresses the generation of the edge collapse problem without changing the process parameters, and greatly improves the hole drilling quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The electronic device structure schematic diagram of the hardware running environment related to the embodiments of the application; Figure 2 The flowchart schematic diagram of the double-top corner drill bit design method provided by the embodiments of the application; Figure 3 The schematic diagram of the maximum edge collapse diameter in the double-top corner drill bit design method provided by the embodiments of the application; Figure 4 The schematic diagram of the first mapping relationship in the double-top corner drill bit design method provided by the embodiments of the application; Figure 5 The schematic diagram of the second mapping relationship in the double-top corner drill bit design method provided by the embodiments of the application; Figure 6 The front view structure schematic diagram of the double-top corner drill bit provided by the embodiments of the application; Figure 7 A top view of the structure of a double-center-angle drill bit provided in an embodiment of this application; Figure 8 A schematic diagram of the module for a dual-center-angle drill bit design device provided in an embodiment of this application; The diagram is labeled as follows: 101-Processor, 102-Communication bus, 103-Network interface, 104-User interface, 105-Memory. Detailed Implementation

[0017] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0018] See attached document Figure 1 , attached Figure 1 This is a schematic diagram of the electronic device structure of the hardware operating environment involved in the embodiments of this application. The electronic device may include: a processor 101, such as a central processing unit (CPU), a communication bus 102, a user interface 104, a network interface 103, and a memory 105. The communication bus 102 is used to realize the connection and communication between these components. The user interface 104 may include a display screen and an input unit such as a keyboard. Optionally, the user interface 104 may also include a standard wired interface and a wireless interface. The network interface 103 may optionally include a standard wired interface and a wireless interface (such as a Wi-Fi interface). The memory 105 may be a storage device independent of the aforementioned processor 101. The memory 105 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as at least one disk storage device. The processor 101 may be a general-purpose processor, including a central processing unit, a network processor, etc., or it may be a digital signal processor, an application-specific integrated circuit, a field-programmable gate array or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component.

[0019] Those skilled in the art will understand that the appendix Figure 1 The structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0020] As attached Figure 1 As shown, the memory 105, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a dual-peak drill bit design device.

[0021] In the electronic device shown in the figure, the network interface 103 is mainly used for data communication with the network server; the user interface 104 is mainly used for data interaction with the user; the processor 101 and the memory 105 in the application can be arranged in the electronic device, and the electronic device calls the double-top angle drill bit design device stored in the memory 105 through the processor 101, and executes the double-top angle drill bit design method provided by the application. Figure 1 Fiber-reinforced hard and brittle composite material is a kind of difficult-to-machine composite material with fiber as reinforcing phase and hard and brittle material as matrix phase. When the drill bit drills to the outlet, the material to be removed on the outlet side is subjected to the action of axial force and radial force at the same time. Drilling is a typical machining method with large axial force. At the outlet position of the machined hole, the material is removed in a brittle fracture manner under the action of a large axial force due to the small thickness of the material at the outlet position. Therefore, the outlet side of the fiber-reinforced hard and brittle composite material is prone to machining damage. Due to the characteristics of the fiber-reinforced hard and brittle composite material, when subjected to a large axial force, the fiber-reinforced hard and brittle composite material generates defects such as edge collapse, which easily leads to the quality of the hole not meeting the design requirements.

[0022] Patent CN109351999A (a drill bit and method for drilling high-hardness fiber-reinforced ceramic matrix composite parts) designs a whole sintered PCD drill bit for fiber-reinforced ceramic matrix composite materials, and proposes a drilling device and method for this drill bit, which can process fiber-reinforced ceramic matrix composite materials with low damage, high precision and high efficiency. However, this patent only uses PCD material for the drill tip, and does not optimize the structure of the drill tip. In the case of a large top angle, there will still be a large axial force, and the edge collapse problem cannot be solved.

[0023] Patent CN104999118A (a high-efficiency special drill bit for carbon fiber composite material hole making) proposes a multi-edge tool with double top angles and micro-tooth structure, which realizes the drilling-expanding-hinging integrated machining of carbon fiber reinforced composite materials. Although it can overcome the delamination and burr problems during machining of carbon fiber composite materials, the micro-tooth structure is prone to edge collapse when machining fiber-reinforced hard and brittle composite materials, and cannot solve the edge collapse problem of fiber-reinforced hard and brittle composite material hole making.

[0024] Patent CN106270664A (a polycrystalline diamond drill bit with reverse shear maintaining structure) proposes a polycrystalline diamond drill bit for fiber-reinforced composite material quality control, which improves the service life of the drill bit and reduces the delamination defect, but only gives the angle value range in the design of the double-top angle of the drill bit, and does not clarify the design method.

[0025]

[0026] ​Patent CN105034076A (A special tool for efficient hole making of fiber reinforced composite materials) proposes a special tool for efficient hole making of fiber reinforced composite materials, which realizes one-time low-damage hole making of fiber reinforced composite materials. However, the angle of the double tip angle is determined based on experience and lacks effective design method guidance.

[0027] To address the problems existing in the prior art, refer to the appendix. Figure 2 Based on the hardware device of the foregoing embodiments, embodiments of this application provide a double-apex drill bit design method for drilling holes in fiber-reinforced hard and brittle composite materials, comprising the following steps: S10: Based on drilling test cuts with different tip angles, obtain the first mapping relationship and the second mapping relationship; wherein, the first mapping relationship is the mapping relationship between tip angle size and maximum chipping diameter, and the second mapping relationship is the mapping relationship between tip angle size and drill bit service life.

[0028] In the specific implementation process, experiments were conducted by setting different sizes of tip angles to obtain the relationship between tip angle size and maximum chipping diameter, as well as the relationship between tip angle size and drill bit lifespan. This relationship was then converted into a one-to-one mapping relationship. Based on the influence of the above parameters on the size of maximum chipping and lifespan in drilling, independent experimental analysis was conducted to provide data support for the subsequent design of double tip angle drill bits.

[0029] In one embodiment, a first mapping relationship and a second mapping relationship are obtained based on drilling trial cutting tests with different vertex angles, including: Based on drilling test cuts with different tip angles, multiple tip angle data and their corresponding first maximum chipping diameter data and first drill bit service life data were obtained; Based on the target fitting function, multiple tip angle data are fitted with the first maximum chipping diameter data and multiple tip angle data are fitted with the first drill bit service life data to obtain the first mapping relationship and the second mapping relationship.

[0030] In the specific implementation process, when obtaining the mapping relationship, the target fitting function is used to fit multiple tip angle data and their corresponding maximum chipping diameter data and drill bit lifespan data respectively. Before fitting, the lifespan data needs to be quantified. This application uses the number of boreholes to measure drill bit lifespan, assuming machining... After one hole, the chipped edge diameter is greater than the preset critical value for chipped edge diameter. In cases where there is excessive hole position deviation, the drill bit life is... If the drill bit is in the processing stage If the drill bit chipps or is otherwise damaged during drilling, the drill bit life is [time period missing]. Preset critical value for edge breakage diameter. Determined based on the part's machining requirements.

[0031] As the drill bit enters the material, the axial force of the drill bit gradually increases from zero with the length of the cutting edge involved in the cutting. The maximum axial force occurs when all the main cutting edges of the drill bit are engaged in cutting. When the drill bit begins to exit the process, the axial force begins to decrease until it reaches zero. At this point, due to the low interlaminar bond strength and high brittleness of the fiber-reinforced hard-brittle composite material, chipping defects are very likely to occur. The maximum chipping diameter is shown in the attached figure. Figure 3 As shown, the maximum chipped edge diameter It is the diameter of the smallest circumcircle of the chipped area, centered at the hole center. Under the same process parameters, the tip angle of the main cutting edge is an important factor affecting the axial force during drilling, thus influencing the maximum chipped diameter.

[0032] Since a mapping relationship is required, the tip angle data needs to be correlated with its corresponding maximum chipping diameter and service life data. This is done by plotting discrete points. Specifically, based on the target fitting function, multiple tip angle data are fitted with the first maximum chipping diameter data and multiple tip angle data are fitted with the first drill bit service life data. Before obtaining the first and second mapping relationships, the method also includes: Discrete point plots were drawn based on multiple tip angle data and the first maximum chipping diameter data, as well as multiple tip angle data and the first drill bit lifespan data. Based on the target fitting function, multiple tip angle data are fitted with the first maximum chipping diameter data and multiple tip angle data are fitted with the first drill bit service life data to obtain a first mapping relationship and a second mapping relationship, including: Based on the target fitting function, the discrete point plots are fitted to obtain the first mapping relationship and the second mapping relationship.

[0033] In the specific implementation process, taking the mapping relationship between the tip angle and the maximum chipping diameter as an example: In the drilling test, the maximum chipping diameter after each drilling is measured. To facilitate fitting, the tip angle is... Transform into ( ) and maximum chipped diameter The points are plotted as a two-dimensional scatter plot. Then, a target fitting function is used to fit the scatter plot. This means determining a curve that conforms to the function's form, ensuring that as many points as possible lie on the curve. The resulting first mapping relationship is shown in the attached figure. Figure 4 As shown.

[0034] Taking the mapping relationship between the tip angle and drill bit lifespan as an example: In the drilling test, the maximum chipping diameter after each drilling operation is measured and the value exceeding the critical value is recorded. Number of holes at time Similarly, for ease of fitting, the vertex angle is... Transform into ( ) and drill bit life The points were plotted as a two-dimensional scatter plot, and then fitted using the target fitting function. The resulting second mapping relationship is shown in the appendix. Figure 5 As shown.

[0035] The selection of the target fitting function is based on the coefficient of determination. Before determining the first and second mapping relationships by fitting multiple tip angle data with the first maximum chipping diameter data and multiple tip angle data with the first drill bit lifespan data according to the target fitting function, the method further includes: Based on the fitting of multiple different fitting functions to the same data, the fitting function with the largest coefficient of determination is determined as the target fitting function.

[0036] In practical implementation, the coefficient of determination, also known as the coefficient of resolution, represents the numerical characteristic of the relationship between a random variable and multiple random variables. It is a statistical indicator used to reflect the reliability of the regression model in explaining the changes in the dependent variable. Multiple different fitting functions are used to fit the same data; for example, exponential functions, linear functions, logarithmic functions, third-order polynomial functions, and power functions are used to fit the discrete point plot data in the aforementioned embodiment. The fitting function corresponding to the maximum value of the coefficient of determination is selected as the target fitting function. The fitting of the first mapping relationship is shown below:

[0037] in, ( ) is the coefficient, This is the error factor.

[0038] right ( Differentiation yields:

[0039] Therefore, when the apex angle The smaller the size, the larger the maximum chipped edge diameter. The smaller.

[0040] The fitting of the second mapping relationship is shown below:

[0041] in, ( ) is the coefficient, This is the error factor.

[0042] right ( Differentiation yields:

[0043] Therefore, within a certain range, when the apex angle... The larger the value, the longer the drill bit life.

[0044] S20: Under the constraints of edge breakage diameter and drill bit service life, the angle selection range of the first and second tip angles is obtained according to the first and second mapping relationships.

[0045] In practice, during actual drilling operations, constraints are typically placed on the chipping diameter and drill bit life, assuming the chipping diameter does not exceed... The lifespan of the drill bit is no less than The tip angle of the first primary cutting edge of a double-pointed drill bit. Compared to the tip angle of the second primary cutting edge The tip angle of the second primary cutting edge has a significant impact on drill bit life. It plays a more important role in determining the chipping diameter. Therefore, through the critical value... and This allows us to obtain the angle selection range for the two tip angles, specifically the maximum value of the tip angle of the second primary cutting edge. The maximum value of the tip angle of the first primary cutting edge and .

[0046] S30: Within the angle selection range, select the combination of the first and second tip angles for testing to obtain the maximum chipping diameter and drill bit service life data under different angle combinations.

[0047] S40: Based on the maximum chipping diameter data that meets the processing requirements, determine the target tip angle combination according to the maximum drill bit life data.

[0048] In the specific implementation process, this application only considers the situations commonly used in actual processing, namely... In this situation. If This means that the requirement for drill bit life is higher than the requirement for chipped edge diameter; in this case, it is only necessary to ensure... This allows for the simultaneous fulfillment of both lifespan and chipping diameter requirements. To determine a more suitable tip angle combination, commonly used tip angle combinations were selected for testing. During the tests, chipping diameter and drill bit life data for different combinations were collected. Then, provided that the maximum chipping diameter met the processing requirements, the tip angle combination with a longer lifespan was selected.

[0049] S50: Obtain drill bit geometry parameters based on the target tip angle combination and the designed drill bit diameter to complete the drill bit design.

[0050] In the specific implementation process, given the known drill bit diameter In this case, the geometric parameters of a double-apex drill bit also include the drill tip height. First primary cutting edge tip angle Second primary cutting edge tip angle And the width of the first primary cutting edge is Among them, the drill bit diameter The diameter of the tool that can be clamped on the spindle and the drilling process requirements can be determined before step S50.

[0051] The aforementioned steps have yielded the combination of apex angles, namely... and It has been determined that further calculations can be performed using geometric relationships. and Specifically: Based on the target tip angle combination and the designed drill bit diameter, the drill bit geometry parameters are obtained to complete the drill bit design, including: The drill tip height range is obtained based on the target tip angle combination and the designed drill bit diameter; Determine the drill tip height within the range of processing influencing factors; Based on the drill tip height, target tip angle combination, and designed drill bit diameter, the width of the first primary cutting edge is obtained to complete the drill bit design.

[0052] In practical implementation, the drill tip height of a double-centered angle drill bit can be obtained through geometric relationships. and The relationship is as follows:

[0053] Only consider in the application Therefore Transforming the above equation, we get:

[0054] Therefore, when and When known, Depend on and Confirmed. To ensure... The following conditions must be met when determining the drill tip height:

[0055] The above formula represents the range of drill tip height. Further consideration should be given to machining factors, such as drill bit machinability and material properties, to determine the final drill tip height within this range. At this point, the drill bit tip height... First primary cutting edge tip angle Second primary cutting edge tip angle It is determined that the width of the first primary cutting edge is... The calculation formula can be obtained Once the final size is determined and all drill bit geometry parameters are obtained, the design of the double-apex drill bit is complete.

[0056] In this embodiment, the mapping relationship between the drill tip angle, maximum chipping diameter, and drill life is first studied to determine the influence of the tip angle on chipping and drill life. Then, under constraints, the range of the two tip angles of a double-tip-angle drill is determined based on the mapping relationship. Next, by combining tip angles and conducting experiments, the drill angle combination with the longest lifespan within the maximum allowable chipping diameter range is determined. Finally, other geometric parameters of the drill are calculated based on the designed drill diameter to complete the design of the double-tip-angle drill. Using this drill to drill holes in fiber-reinforced hard and brittle composite materials, the axial force at the drill exit can be effectively reduced while maintaining high drill tip strength. Through improvements to the drill structure, chipping is effectively suppressed without changing process parameters, resulting in a significant improvement in hole quality.

[0057] Based on the same inventive concept as in the foregoing embodiments, this application also provides a double-center-angle drill bit, which is obtained by using the double-center-angle drill bit design method provided in this application.

[0058] This application will be further explained using specific design parameters as an example: Ceramic matrix composites are a typical type of fiber-reinforced hard and brittle composite material. Taking ceramic matrix composite drilling as an example, the drill bit diameter is determined based on the diameter of the tool that can be clamped on the spindle and the drilling process requirements. .

[0059] Select the tip angle of the main cutting edge PCD drill bits with values ​​ranging from 95° to 175° were subjected to trial cutting tests on the same number of holes. After the tests, the maximum chipping diameter was measured and recorded using a super-depth-of-field microscope. The data corresponding to different tip angles were then compared. and maximum chipped diameter The plot is shown in the attached two-dimensional scatter plot. Figure 4 As shown.

[0060] Fittings were performed using exponential, linear, logarithmic, third-order polynomial, and power functions, respectively, and the coefficients of determination R were calculated. 2 ,get The mapping relationship is as follows When the maximum chipped diameter is limited to hour, .

[0061] Select the tip angle of the main cutting edge PCD drill bits with values ​​ranging from 95° to 175° underwent life testing experiments. After the tests, measurements were taken using a super depth-of-field microscope. When the... The maximum chipped diameter of each hole is greater than If other conditions exist that do not meet the processing requirements, the drill bit life is considered to be n-1. The data corresponding to different tip angles are then used to determine the drill bit life. The drill bit life (n) is plotted as a two-dimensional scatter plot, as shown in the attached figure. Figure 5 As shown.

[0062] Fittings were performed using exponential, linear, logarithmic, third-order polynomial, and power functions, and the coefficients of determination were calculated. ,get The mapping relationship is as follows When the drill bit life is not less than At that time, the tip angle of the first primary cutting edge .

[0063] exist and Under the given conditions, commonly used tip angle combinations were selected for drilling tests of fiber-reinforced hard and brittle composite materials. Drill bit life data for different tip angle combinations and the maximum chipping diameter during the tests were collected, as shown in Table 1 below: Table 1 - Drill bit life data and maximum chipping diameter for different tip angle combinations

[0064] As can be seen from the table above, when , The drill bit has the longest lifespan when the drill bit is at its longest. , At this point, the maximum chipping diameter is minimized. Since the maximum chipping diameter for all combinations is less than the specified critical value... Therefore, considering only lifespan factors, the selection... , This is a combined design of a double-pointed drill bit. Calculations show that the drill tip height... Must meet:

[0065] Taking into account factors such as drill bit machinability and material properties, the final drill bit tip height is determined. Therefore, the width of the first primary cutting edge can be obtained as:

[0066] The double-center-angle drill bit designed in the above embodiments can be as shown in the attached figure. Figure 6 Appendix Figure 7 As shown, the drill bit consists of a carbide shank and a PCD cutting tip, with the cutting tip welded to the shank. Its geometric parameters are as follows: , , , Compared to single-point drill bits ( , , Under the same process parameters, the maximum chipping diameter of the hole in fiber-reinforced hard and brittle composite materials is increased by... Descending to It meets the design requirements, and the drill bit's machining life has been increased from the original 5-10 holes to 60 holes, achieving a simultaneous improvement in machining quality and tool life.

[0067] See attached document Figure 8 Based on the same inventive concept as in the foregoing embodiments, this application also provides a double-apex drill bit design device for drilling holes in fiber-reinforced hard and brittle composite materials, comprising: The mapping module is used to obtain a first mapping relationship and a second mapping relationship based on drilling test cuts with different tip angles; wherein, the first mapping relationship is the mapping relationship between tip angle size and maximum chipping diameter, and the second mapping relationship is the mapping relationship between tip angle size and drill bit lifespan; The constraint module is used to obtain the angle selection range of the first tip angle and the second tip angle based on the first mapping relationship and the second mapping relationship under the constraints of edge breakage diameter and drill bit service life. The combination module is used to select the combination of the first and second tip angles within the angle selection range to conduct experiments and obtain the maximum chipping diameter data and drill bit service life data under different angle combinations. The determination module is used to determine the target tip angle combination based on the maximum drill bit lifespan data from the maximum chipped edge diameter data that meets the processing requirements. The design module is used to obtain the drill bit geometry parameters based on the target tip angle combination and the designed drill bit diameter to complete the drill bit design.

[0068] Those skilled in the art should understand that the division of the various modules in the embodiments is merely a logical functional division. In actual applications, they can be fully or partially integrated into one or more actual carriers. These modules can be implemented entirely in software through processing unit calls, entirely in hardware, or a combination of software and hardware. It should be noted that each module in the double-centered-angle drill bit design device in this embodiment corresponds one-to-one with each step in the double-centered-angle drill bit design method in the aforementioned embodiments. Therefore, the specific implementation of this embodiment can refer to the implementation of the aforementioned double-centered-angle drill bit design method, which will not be repeated here.

[0069] Based on the same inventive concept as in the foregoing embodiments, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when loaded and executed by a processor, implements the double-apex drill bit design method provided in the embodiments of this application.

[0070] Based on the same inventive concept as in the foregoing embodiments, embodiments of this application also provide an electronic device, including a processor and a memory, wherein, Memory is used to store computer programs; The processor is used to load and execute computer programs to enable electronic devices to perform the double-apex drill bit design method provided in the embodiments of this application.

[0071] In some embodiments, the computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface memory, optical disk, or CD-ROM; or it may be a device including one or any combination of the above-mentioned memories. The computer may be a variety of computing devices, including smart terminals and servers.

[0072] In some embodiments, executable instructions may take the form of a program, software, software module, script, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a standalone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.

[0073] As an example, executable instructions may, but do not necessarily, correspond to files in the file system. They may be stored as part of a file that holds other programs or data, for example, in one or more scripts in a Hyper Text Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple collaborative files (e.g., a file that stores one or more modules, subroutines, or code sections).

[0074] As an example, executable instructions can be deployed to execute on a single computing device, or on multiple computing devices located in one location, or on multiple computing devices distributed across multiple locations and interconnected via a communication network.

[0075] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system 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 system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0076] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0077] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk) and includes several instructions to cause a multimedia terminal device (which may be a mobile phone, computer, television receiver, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0078] In summary, this application provides a method for designing a double-centered-angle drill bit, a double-centered-angle drill bit, an apparatus, a medium, and equipment. The method includes: obtaining a first mapping relationship and a second mapping relationship based on drilling test cuts with different centered angles; wherein the first mapping relationship is a mapping relationship between the size of the centered angle and the maximum chipping diameter, and the second mapping relationship is a mapping relationship between the size of the centered angle and the service life of the drill bit; under the constraints of chipping diameter and drill bit service life, obtaining the angle selection range of the first and second centered angles based on the first and second mapping relationships; selecting combinations of the first and second centered angles within the angle selection range for testing, obtaining maximum chipping diameter data and drill bit service life data under different angle combinations; determining a target centered angle combination based on the maximum drill bit service life data among the maximum chipping diameter data that meets the processing requirements; and obtaining drill bit geometric parameters based on the target centered angle combination and the designed drill bit diameter to complete the drill bit design.

[0079] This application first studies the mapping relationship between the drill tip angle, the maximum chipping diameter, and the drill life, determining the influence of the tip angle on chipping and drill life. Second, under constraints, it determines the range of the two tip angles of a double-tip-angle drill bit based on the mapping relationship. Then, through experimental screening of combined tip angles, it determines the drill angle combination with the longest service life within the allowable maximum chipping diameter range. Finally, it calculates other geometric parameters of the drill bit based on the designed drill diameter, completing the design of the double-tip-angle drill bit. Using this drill bit to drill holes in fiber-reinforced hard and brittle composite materials, it effectively reduces the axial force at the drill exit while maintaining high drill tip strength. Through improvements to the drill bit structure, it effectively suppresses chipping without changing process parameters, significantly improving hole quality.

[0080] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A design method for a double-centered-angle drill bit, characterized in that, Hole-forming techniques for fiber-reinforced hard and brittle composite materials include the following steps: Based on drilling test cuts with different tip angles, a first mapping relationship and a second mapping relationship are obtained; wherein, the first mapping relationship is the mapping relationship between tip angle size and maximum chipping diameter, and the second mapping relationship is the mapping relationship between tip angle size and drill bit lifespan; Under the constraints of edge breakage diameter and drill bit lifespan, the angle selection range of the first and second tip angles is obtained according to the first and second mapping relationships. Within the angle selection range, the first tip angle and the second tip angle were selected for combination experiments to obtain the maximum chipping diameter data and drill bit service life data under different angle combinations; From the maximum chipping diameter data that meets the processing requirements, the target tip angle combination is determined based on the maximum drill bit lifespan data; Based on the target tip angle combination and the designed drill bit diameter, the drill bit geometry parameters are obtained to complete the drill bit design.

2. The design method for a double-centered drill bit according to claim 1, characterized in that, The process of obtaining the first and second mapping relationships based on drilling test cuts with different vertex angles includes: Based on drilling test cuts with different tip angles, multiple tip angle data and their corresponding first maximum chipping diameter data and first drill bit service life data were obtained; Based on the target fitting function, the multiple tip angle data are fitted with the first maximum chipping diameter data and the multiple tip angle data are fitted with the first drill bit service life data to obtain a first mapping relationship and a second mapping relationship.

3. The method for designing a double-centered drill bit according to claim 2, characterized in that, Before fitting the plurality of tip angle data with the first maximum chipping diameter data and the plurality of tip angle data with the first drill bit service life data according to the target fitting function to obtain the first mapping relationship and the second mapping relationship, the method further includes: Based on the fitting of the same data by multiple different fitting functions, the fitting function with the largest coefficient of determination is determined as the target fitting function.

4. The design method for a double-centered drill bit according to claim 2, characterized in that, Before fitting the plurality of tip angle data with the first maximum chipping diameter data and the plurality of tip angle data with the first drill bit service life data according to the target fitting function to obtain the first mapping relationship and the second mapping relationship, the method further includes: Discrete point plots are drawn based on the multiple tip angle data and the first maximum chipping diameter data, as well as the multiple tip angle data and the first drill bit lifespan data. The step of fitting the multiple tip angle data with the first maximum chipping diameter data and the multiple tip angle data with the first drill bit service life data according to the target fitting function to obtain a first mapping relationship and a second mapping relationship includes: Based on the target fitting function, the plotted discrete point map is fitted to obtain the first mapping relationship and the second mapping relationship.

5. The method for designing a double-centered drill bit according to claim 1, characterized in that, The step of obtaining drill bit geometric parameters based on the target tip angle combination and the designed drill bit diameter to complete the drill bit design includes: Based on the target tip angle combination and the designed drill bit diameter, the drill tip height range is obtained; The drill tip height is determined within the range of the drill tip height based on the factors affecting the processing. The first main cutting edge width is obtained based on the drill tip height, the target tip angle combination, and the designed drill bit diameter to complete the drill bit design.

6. The method for designing a double-centered drill bit according to claim 1, characterized in that, Before obtaining the drill bit geometry parameters based on the target tip angle combination and the designed drill bit diameter to complete the drill bit design, the method further includes: The diameter of the designed drill bit is determined based on the diameter of the tool that can be clamped on the spindle and the drilling process requirements.

7. A double-centered-angle drill bit, characterized in that, The drill bit is obtained by using the double-center angle drill bit design method as described in any one of claims 1-6.

8. A design device for a double-centered drill bit, characterized in that, Hole-forming techniques applied to fiber-reinforced hard and brittle composite materials include: The mapping module is used to obtain a first mapping relationship and a second mapping relationship based on drilling test cuts with different tip angles; wherein, the first mapping relationship is the mapping relationship between tip angle size and maximum chipping diameter, and the second mapping relationship is the mapping relationship between tip angle size and drill bit lifespan; The constraint module is used to obtain the angle selection range of the first tip angle and the second tip angle based on the first mapping relationship and the second mapping relationship, under the constraints of edge breakage diameter and drill bit service life. The combination module is used to select the first tip angle and the second tip angle combination within the angle selection range for testing, and to obtain the maximum chipping diameter data and drill bit service life data under different angle combinations. The determination module is used to determine the target tip angle combination based on the maximum drill bit lifespan data among the maximum chipping diameter data that meet the processing requirements; The design module is used to obtain the drill bit geometry parameters based on the target tip angle combination and the designed drill bit diameter to complete the drill bit design.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is loaded and executed by the processor, it implements the double-center-angle drill bit design method as described in any one of claims 1-6.

10. An electronic device, characterized in that, Including processor and memory, among which, The memory is used to store computer programs; The processor is used to load and execute the computer program to cause the electronic device to perform the double-center-angle drill bit design method as described in any one of claims 1-6.

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