CN113703392A - Data acquisition method, device and equipment for carbon fiber product - Google Patents
Data acquisition method, device and equipment for carbon fiber product Download PDFInfo
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- G05B2219/35—Nc in input of data, input till input file format
- G05B2219/35349—Display part, programmed locus and tool path, traject, dynamic locus
Abstract
The invention relates to a data acquisition method, a device and equipment of a carbon fiber product, which comprises the following steps: acquiring a three-dimensional model of a product to be processed based on a carbon fiber product processing order; identifying processing elements of the three-dimensional model of the product to be processed, and generating a processing route of processing characteristic elements according to a preset process rule; acquiring the processing condition in the processing process in real time, and evaluating according to the processing condition to obtain a weight value; and if the weight value is lower than the preset weight value, adjusting the processing route in the processing process. The invention utilizes the eddy current detection technology to detect the crack phenomenon generated in the processing process of the carbon fiber material, thereby adjusting the processing route according to the position of the crack, reducing the fracture phenomenon of the carbon fiber blank material in the processing process, reducing the phenomenon that the carbon fiber blank material has to be re-processed when being processed to a certain step, saving the processing time of the carbon fiber product, further improving the processing efficiency, saving the material cost and reducing the blank rejection rate of the carbon fiber material.
Description
Technical Field
The invention relates to the field of carbon fiber products, in particular to a data acquisition method, a data acquisition device and data acquisition equipment for carbon fiber products.
Background
The carbon fiber reinforced composite material has excellent performances such as high strength and high modulus, and gradually becomes a preferred structural material of a novel aircraft. The carbon fiber reinforced composite material is formed by combining a resin matrix and a carbon fiber reinforcement, the properties of the two-phase material differ greatly, the processing mechanism of the two-phase material is completely different from that of the traditional homogeneous metal, and various processing problems which are difficult to predict, such as various processing defects, extremely bad processing environment and the like, are easy to occur in processing, so the carbon fiber reinforced composite material belongs to a typical difficult-to-process material. The research in the aspect of composite material processing starts earlier in China, but the development of China in this aspect is relatively slow, and compared with the foreign countries, the technical force of composite material processing is greatly different. With the rapidly increasing application trend of composite materials in various fields, the application of carbon fiber reinforced composite materials has been promoted to a strategic height, and is related to the future of the key development fields of aviation, aerospace, national defense and the like in China. Although some special processing methods can be adopted to overcome some processing problems, the processing methods have certain limitations, the equipment is complex and expensive, the processing cost is high, the field processing is difficult, and the processing with high efficiency, high quality and low cost is difficult to realize.
After cutting for a period of time, under the action of continuous impact stress and cutting heat, the deformation of the base material and the coating material after being stressed and heated is different due to the elastic modulus and the thermal expansion coefficient of the base material, and when the deformation is large enough to overcome the adhesive force between the coating and the base, the coating material and the base material are desorbed, and large internal stress is generated in the coating film, so that the generation of cracks of the coating material is further caused. And during processing, because the carbon fiber material is a brittle material, the fracture phenomenon easily occurs in the processing process, after a certain step is processed, the processing has to be restarted because the blank in the processing process fractures, so that the processing time is wasted, the processing efficiency is low, and the material is wasted, so that the processing cost is high.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a data acquisition method, a device and equipment for carbon fiber products.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a data acquisition method of a carbon fiber product, which comprises the following steps:
acquiring order information of a carbon fiber product;
identifying the processing elements and the outline dimension information in the order information, and establishing a processing model of the product to be processed based on the outline dimension information;
inputting the processing elements into a processing model of the product to be processed to generate a processing route;
acquiring a processing condition in a processing process in real time, and evaluating the processing condition to obtain a weight value;
and if the weight value is lower than the preset weight value, adjusting the processing route in the processing process.
Further, in a preferred embodiment of the present invention, if the weight value is lower than the preset weight value, the adjusting the processing route in the processing process includes the following steps:
acquiring feedback eddy current signal information from a blank material to a carbon fiber product in the processing process;
carrying out numerical simulation analysis on the eddy current signal information to obtain an analysis result, and establishing a stress corrosion crack model based on the analysis result;
obtaining the position relation of each crack in a three-dimensional space from the stress corrosion crack model;
and replanning the processing route in the processing process based on the position relation.
Further, in a preferred embodiment of the present invention, the performing a numerical simulation analysis on the eddy current signal information to obtain an analysis result, and establishing a stress corrosion crack model based on the analysis result specifically includes the following steps:
carrying out numerical analysis on the eddy current signal by a finite element dispersion method to obtain a crack eddy current signal;
determining a length, a width, and a depth of the crack based on the crack eddy current signal;
and establishing a stress corrosion crack model according to the length, the width and the depth of the crack.
Further, in a preferred embodiment of the present invention, the replanning the processing route in the processing process based on the position relationship specifically includes:
selecting an initial position of a crack as a first sub-initial point, taking a position point with the farthest distance from the initial position of the crack as a first sub-terminal point, and planning a first optimal processing path for a processing route according to the first sub-initial point and the first sub-terminal point;
taking the first sub-end point as a second sub-starting point, selecting the end position of another crack which is farthest away from the position point of the first sub-end point as a second sub-end point, and planning a second optimal processing path for the processing route according to the second sub-starting point and the second sub-end point;
and according to the above mode, until an Nth optimal processing path is planned, and the first optimal processing path, the second optimal processing path and the Nth optimal processing path form an optimal processing path.
Further, in a preferred embodiment of the present invention, the processing condition in the processing process is obtained in real time, and the evaluation is performed according to the processing condition to obtain the weight value, which specifically includes the following steps:
determining a cutting force vector of each machining position according to the machining route of the machining characteristic elements, and decomposing the cutting force vector into a one-dimensional cutting force vector;
and acquiring the machining condition in the machining process in real time, calculating a weight value, judging whether the one-dimensional cutting force vector can continuously enlarge the formation of cracks or not when the cracks appear in the machining process, and recalculating the weight value.
Further, in a preferred embodiment of the present invention, the method further comprises the following steps:
after the processing route is adjusted, the processing elements of the product to be processed are identified again;
and reloading the technological schedule according to the processing elements of the product to be processed and adjusting the process steps in each process flow.
The second aspect of the present invention provides a data acquisition apparatus for a carbon fiber product, the apparatus includes a memory and a processor, the memory includes a data acquisition method program for the carbon fiber product, and when the data acquisition method program for the carbon fiber product is executed by the processor, the following steps are implemented:
acquiring order information of a carbon fiber product;
identifying the processing elements and the outline dimension information in the order information, and establishing a processing model of the product to be processed based on the outline dimension information;
inputting the processing elements into a processing model of the product to be processed to generate a processing route;
acquiring a processing condition in a processing process in real time, and evaluating the processing condition to obtain a weight value;
and if the weight value is lower than the preset weight value, adjusting the processing route in the processing process.
Further, in a preferred embodiment of the present invention, if the weight value is lower than the preset weight value, the adjusting the processing route in the processing process includes the following steps:
acquiring feedback eddy current signal information from a blank material to a carbon fiber product in the processing process;
carrying out numerical simulation analysis on the eddy current signal information to obtain an analysis result, and establishing a stress corrosion crack model based on the analysis result;
obtaining the position relation of each crack in a three-dimensional space from the stress corrosion crack model;
and replanning the processing route in the processing process based on the position relation.
Further, in a preferred embodiment of the present invention, the replanning the processing route in the processing process based on the position relationship specifically includes:
selecting an initial position of a crack as a first sub-initial point, taking a position point with the farthest distance from the initial position of the crack as a first sub-terminal point, and planning a first optimal processing path for a processing route according to the first sub-initial point and the first sub-terminal point;
taking the first sub-end point as a second sub-starting point, selecting the end position of another crack which is farthest away from the position point of the first sub-end point as a second sub-end point, and planning a second optimal processing path for the processing route according to the second sub-starting point and the second sub-end point;
and according to the above mode, until an Nth optimal processing path is planned, and the first optimal processing path, the second optimal processing path and the Nth optimal processing path form an optimal processing path.
A third aspect of the present invention provides a data acquisition apparatus for a carbon fiber product, including:
the acquisition module is used for acquiring order information of the carbon fiber product;
the recognition module is used for recognizing the processing elements and the outline dimension information in the order information and establishing a processing model of the product to be processed based on the outline dimension information;
the generating module is used for inputting the processing elements into a processing model of the product to be processed to generate a processing route;
the evaluation module is used for acquiring the processing condition in the processing process in real time and evaluating the processing condition to obtain a weight value;
and the judging module is used for adjusting the processing route in the processing process if the weight value is lower than the preset weight value.
The invention solves the defects in the background technology and can achieve the following technical effects: according to the invention, the crack phenomenon generated in the processing process of the carbon fiber material is detected, so that the processing route is adjusted according to the position of the crack, the fracture phenomenon of the carbon fiber blank material in the processing process is reduced, the phenomenon that the carbon fiber blank material has to be re-processed when being processed to a certain step is reduced, the processing time of the carbon fiber product is further saved, the processing efficiency is further improved, the material cost is saved, and the blank rejection rate of the carbon fiber material is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings of the embodiments can be obtained according to the drawings without creative efforts.
FIG. 1 illustrates an overall method flow diagram of a method of data acquisition for a carbon fiber product;
FIG. 2 shows a flow chart of a method of adjusting a process line;
FIG. 3 shows a detailed flow chart for obtaining analysis results;
FIG. 4 illustrates a flow chart of a particular method of re-planning a process line;
FIG. 5 is a flow chart illustrating a specific method of deriving weight values;
fig. 6 shows a block schematic diagram of a data acquisition method for a carbon fiber product.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
FIG. 1 illustrates an overall method flow diagram of a method of data acquisition for a carbon fiber product;
the invention provides a data acquisition method of a carbon fiber product, which comprises the following steps:
s102, acquiring order information of the carbon fiber product;
s104, identifying the processing elements and the outline dimension information in the order information, and establishing a processing model of the product to be processed based on the outline dimension information;
s106, inputting the processing element into a processing model of the product to be processed to generate a processing route;
s108, acquiring the processing condition in the processing process in real time, and evaluating the processing condition to obtain a weight value;
and S110, if the weight value is lower than the preset weight value, adjusting the processing route in the processing process.
It should be noted that, the processing elements include a surface roughness value, a position when drilling, position information of a groove, depth information of the groove, and the like of the carbon fiber product, where the contour dimension information is an outline contour dimension, a contour shape, and the like in a drawing of the carbon fiber product to be processed, and a three-dimensional model map is established by using three-dimensional modeling software based on the contour dimension information, where the three-dimensional model map is a processing model, and in the processing process, since the carbon fiber material is a brittle material, one or more cracks may occur due to the influence of a cutting force, it is determined whether the crack in a preset processing route can further damage a non-processing position of the carbon fiber processed product, that is, whether the distance of the crack can be further extended under the processing route is predicted. Wherein, the direction probability value that this crackle can continue to extend under former processing route, weight value promptly, wherein the weight value satisfies:
wherein
Is a weight value of the weight value,
as the initial position coordinates of the nth original processing route,
is the critical coordinate of the non-machining position of the (n + 1) th original machining route,
to generate the mth initial position coordinate of the crack,
j is the jth machining position of the original machining route, and m is the mth crack when a crack is generated.
When the weight value is less than 0, the probability value of the extension of the crack to the non-processing area of the blank material according to the original processing route is large, and the processing route can be adjusted at the moment. Otherwise, the processing route is not adjusted.
FIG. 2 shows a flow chart of a method of adjusting a process line;
further, in a preferred embodiment of the present invention, if the weight value is lower than the preset weight value, the adjusting the processing route in the processing process includes the following steps:
s202, acquiring feedback eddy current signal information from a blank material to a carbon fiber product in the processing process;
s204, carrying out numerical simulation analysis on the eddy current signal information to obtain an analysis result, and establishing a stress corrosion crack model based on the analysis result;
s206, obtaining the position relation of each crack in the three-dimensional space from the stress corrosion crack model;
and S208, replanning the processing route in the processing process based on the position relation.
It should be noted that the eddy current signal specifically includes the electrical conductivity of the current carbon fiber product, the electrical conductivity of the crack position, and the component value of the scalar potential of the crack position. Wherein the component values of the scalar potential are electromotive force values in volts. The larger the size of the crack, the smaller the component value of the scalar potential it generates, and the worse the conductivity.
FIG. 3 shows a detailed flow chart for obtaining analysis results;
further, in a preferred embodiment of the present invention, the performing a numerical simulation analysis on the eddy current signal information to obtain an analysis result, and establishing a stress corrosion crack model based on the analysis result specifically includes the following steps:
s302, carrying out numerical analysis on the eddy current signal by using a finite element dispersion method to obtain a crack eddy current signal;
s304, determining the length, the width and the depth of the crack based on the crack eddy current signal;
and S306, establishing a stress corrosion crack model according to the length, the width and the depth of the crack.
It should be noted that, during the machining process, when the eddy current probe detects the surface of the workpiece, an eddy current magnetic field is generated at this time, and the generation of the eddy current magnetic field also generates a potential, within any eddy current field unit, the eddy current signal of the crack generated has a certain difference from the normal eddy current signal, and the volume shape of the crack portion of the eddy current signal in the crack satisfies a certain stress corrosion crack model relation:
wherein
Vector magnetic potential fed back by the eddy current probe; k is the total number of detection nodes in the unit; i is the ith detection node;
、
、
coordinate values of crack points in x, y and z directions; cracks are often formed in a certain shape,
、
、
vector magnetic potential components in the ith detection node in the x direction, the y direction and the z direction respectively also represent component values of scalar electric potentials in the x direction, the y direction and the z direction.
The electric quantity value of the scalar potential represents the electric conductivity of the carbon fiber material in three crack directions in the x direction, the y direction and the z direction, so that the length, the depth and the width of the crack in the three directions can be obtained, further the respective coordinate values of the crack in the three directions are obtained, the electric conductivity is calculated by adopting a finite element discrete method, and a crack signal is screened out, wherein the scalar potential and the electric conductivity have a certain finite element discrete matrix relation:
where A is conductivity, i is the ith sense node,
、
、
vector magnetic potential components of the ith detection node in the x direction, the y direction and the z direction respectively also represent component values of scalar potentials of the ith detection point in the x direction, the y direction and the z direction.
In the position of the crack-free portion, the electrical conductivity a was a normal value, and the value of a after the occurrence of the crack was changed to a certain value. Therefore, the longer the value of the length of the crack in each direction, the larger the change in the value of the electrical conductivity a during the inspection of the machining.
It should be noted that, in the processing process, since the carbon fiber material is a brittle material, in the above manner, when a crack is detected in the processing process, some processing robots or processing equipment re-plan the processing route according to the manner, so that the technical problem that the processed piece has to be re-processed due to a fracture phenomenon in the processing process can be avoided, the processing efficiency is further improved, and the material cost is saved.
FIG. 4 illustrates a flow chart of a particular method of re-planning a process line;
further, in a preferred embodiment of the present invention, the replanning the processing route in the processing process based on the position relationship specifically includes:
s402, selecting an initial position of a crack as a first sub-starting point, using a position point with the farthest distance from the initial position of the crack as a first sub-end point, and planning a first optimal processing path for a processing route according to the first sub-starting point and the first sub-end point;
s404, taking the first sub-end point as a second sub-start point, selecting the end position of another crack which is farthest away from the position point of the first sub-end point as a second sub-end point, and planning a second optimal processing path for the processing route according to the second sub-start point and the second sub-end point;
and S406, planning an Nth optimal processing path according to the above mode, wherein the first optimal processing path, the second optimal processing path and the Nth optimal processing path form an optimal processing path.
It should be noted that, in the processing process, there may be one or more cracks, if according to the original processing route, a crack phenomenon is generated due to the influence of the cutting force, if the processing route is continuously adopted for processing, the crack is further extended easily due to the influence of the cutting force, and then the processing route is changed, so that the stress condition of the cutter and the crack position is changed, thereby optimizing the processing route, avoiding the crack phenomenon, further avoiding the crack extension, further cracking the protected blank material, and further damaging the position which does not need to be processed, and the waste of materials can be effectively reduced.
FIG. 5 is a flow chart illustrating a specific method of deriving weight values;
further, in a preferred embodiment of the present invention, the processing condition in the processing process is obtained in real time, and the evaluation is performed according to the processing condition to obtain the weight value, which specifically includes the following steps:
s502, determining a cutting force vector of each machining position according to the machining route of the machining characteristic elements, and decomposing the cutting force vector into a one-dimensional cutting force vector;
s504, acquiring the machining condition in the machining process in real time, calculating a weight value, judging whether the one-dimensional cutting force vector can continuously enlarge the formation of cracks or not when the cracks appear in the machining process, and recalculating the weight value.
When a crack occurs, if the processing is performed according to the original processing route, due to the action of the moment in a certain direction of the cutting force, when the moment value in a certain direction exceeds the deformation value that can be borne by the position, the probability value that the position continues to extend in the certain direction is increased, and when the direction points to the direction of the non-processing position of the carbon fiber product, the processing route needs to be readjusted.
Further, in a preferred embodiment of the present invention, the method further comprises the following steps:
after the processing route is adjusted, the processing elements of the product to be processed are identified again;
and reloading the technological schedule according to the processing elements of the product to be processed and adjusting the process steps in each process flow.
It should be noted that, due to the generation of cracks, if the situation that the carbon fiber material is continuously broken may still be unavoidable in the processing process according to the original process flow, due to the cutting force, the grinding force, the drilling force, and the like, which are applied to the carbon fiber material by the processing method, the process procedures are rough processing, fine processing, and the like, and the cracks are further extended due to the breaking phenomenon generated in the process itself according to the original processing process procedure, and the process steps in the specific process procedure mainly refer to cutting feed routes, grinding feed routes, drilling feed routes, and the like. Therefore, the technological process is necessary to be readjusted, on one hand, the rejection rate of parts of the carbon fiber product in the processing process is reduced by readjusting the technological process, and on the other hand, the service performance of the carbon fiber material is improved.
In addition, since the carbon fiber material has the characteristics of high hardness and brittleness in the processing process, the limit load which the carbon fiber can bear is changed due to the temperature change value in the processing process, a certain contact force is formed between the cutting force and the carbon fiber material, and if the contact force is larger than the limit load value, the crack phenomenon is easily caused, so that the cutting force can be adjusted through the change of the temperature value. Thus, the method may further comprise the steps of:
acquiring the limit load value which can be borne by the carbon fiber material at each temperature;
establishing a temperature limit load model based on the limit load value, and acquiring a temperature value of the current carbon fiber processing position;
introducing the temperature value into the temperature limit load model to obtain a limit load value which can be borne by the current machining position;
obtaining a cutting force value of a current machining position, and judging whether the cutting force value is larger than a limit load value which can be borne by the current machining position;
if the cutting force is larger than the predetermined value, the cutting force is adjusted.
The method includes the steps of obtaining a limit load value which can be borne by a carbon fiber material at each temperature from a big data network, obtaining a temperature value of a processing position by using a temperature sensor, a thermosensitive sensor, an infrared sensor and the like, determining the limit load value of the carbon fiber at the temperature, and further adjusting cutting force, wherein the real-time cutting force can be obtained from processing equipment, the temperature limit load model is equivalent to a database, the limit load value of the carbon fiber corresponding to each temperature value is stored in the database, and the cutting force can be changed by changing the cutting load and the feeding speed.
The second aspect of the present invention provides a data acquisition apparatus for a carbon fiber product, the apparatus includes a memory and a processor, the memory includes a data acquisition method program for the carbon fiber product, and when the data acquisition method program for the carbon fiber product is executed by the processor, the following steps are implemented:
acquiring a three-dimensional model of a product to be processed based on a carbon fiber product processing order;
identifying processing elements of the three-dimensional model of the product to be processed, and generating a processing route of processing characteristic elements according to a preset process rule;
acquiring the processing condition in the processing process in real time, and evaluating according to the processing condition to obtain a weight value;
and if the weight value is lower than the preset weight value, adjusting the processing route in the processing process.
The processing elements include a surface roughness value to be achieved for the carbon fiber product, a position when drilling, position information of the groove, depth information of the groove, and the like, wherein the contour dimension information is an outline contour dimension, a contour shape, and the like in a drawing of the carbon fiber product to be processed, during the processing, since the carbon fiber material is a brittle material, one or more cracks may occur due to the influence of a cutting force, and whether the crack in the preset processing route can further damage a non-processing position of the carbon fiber processed product is determined, that is, whether the distance of the crack can be further extended under the processing route is predicted. Wherein, the direction probability value that this crackle can continue to extend under former processing route, weight value promptly, wherein the weight value satisfies:
wherein
Is a weight value of the weight value,
as the initial position coordinates of the nth original processing route,
is the critical coordinate of the non-machining position of the (n + 1) th original machining route,
to generate the mth initial position coordinate of the crack,
critical coordinate of m +1 th non-processing position for generating crack, j is jth processing position of original processing routeAnd m is the m-th crack when a crack is generated.
When the weight value is less than 0, the probability value of the extension of the crack to the non-processing area of the blank material according to the original processing route is large, and the processing route can be adjusted at the moment. Otherwise, the processing route is not adjusted.
Further, in a preferred embodiment of the present invention, if the weight value is lower than the preset weight value, the adjusting the processing route in the processing process includes the following steps:
acquiring feedback eddy current signal information from a blank material to a carbon fiber product in the processing process;
carrying out numerical simulation analysis on the eddy current signal information to obtain an analysis result, and establishing a stress corrosion crack model based on the analysis result;
obtaining the position relation of each crack in a three-dimensional space from the stress corrosion crack model;
and replanning the processing route in the processing process based on the position relation.
It should be noted that the eddy current signal specifically includes the electrical conductivity of the current carbon fiber product, the electrical conductivity of the crack position, and the component value of the scalar potential of the crack position. Wherein the component values of the scalar potential are electromotive force values in volts. The larger the size of the crack, the smaller the component value of the scalar potential it generates, and the worse the conductivity.
Further, in a preferred embodiment of the present invention, the performing a numerical simulation analysis on the eddy current signal information to obtain an analysis result, and establishing a stress corrosion crack model based on the analysis result specifically includes the following steps:
carrying out numerical analysis on the eddy current signal by a finite element dispersion method to obtain a crack eddy current signal;
determining a length, a width, and a depth of the crack based on the crack eddy current signal;
and establishing a stress corrosion crack model according to the length, the width and the depth of the crack.
It should be noted that, during the machining process, when the eddy current probe detects the surface of the workpiece, an eddy current magnetic field is generated at this time, and the generation of the eddy current magnetic field also generates a potential, within any eddy current field unit, the eddy current signal of the crack generated also has a certain difference from the normal eddy current signal, and the volume shape of the crack portion of the eddy current signal in the crack satisfies a certain model relation:
wherein
Is a vector magnetic potential; k is the total number of detection nodes in the unit; i is the ith detection node;
The electric quantity value of the scalar potential in the x, y and z directions represents the electric conductivity of the carbon fiber material in three crack directions, so that the length, the depth and the width of the crack in the three directions can be obtained, and further the coordinate values of the crack in the three directions are obtained, wherein the scalar potential and the electric conductivity are in a certain matrix relationship:
where A is conductivity, i is the ith sense node,
、
、
vector magnetic potential components of the ith detection node in the x direction, the y direction and the z direction respectively also represent component values of scalar potentials of the ith detection point in the x direction, the y direction and the z direction.
In the position of the crack-free portion, the electrical conductivity a was a normal value, and the value of a after the occurrence of the crack was changed to a certain value. Therefore, the longer the value of the length of the crack in each direction, the larger the change in the value of the electrical conductivity a during the inspection of the machining.
It should be noted that, in the processing process, since the carbon fiber material is a brittle material, in the above manner, when a crack is detected in the processing process, some processing robots or processing equipment re-plan the processing route according to the manner, so that the technical problem that the processed piece has to be re-processed due to a fracture phenomenon in the processing process can be avoided, the processing efficiency is further improved, and the material cost is saved.
Further, in a preferred embodiment of the present invention, the replanning the processing route in the processing process based on the position relationship specifically includes:
selecting an initial position of a crack as a first sub-initial point, taking a position point with the farthest distance from the initial position of the crack as a first sub-terminal point, and planning a first optimal processing path for a processing route according to the first sub-initial point and the first sub-terminal point;
taking the first sub-end point as a second sub-starting point, selecting the end position of another crack which is farthest away from the position point of the first sub-end point as a second sub-end point, and planning a second optimal processing path for the processing route according to the second sub-starting point and the second sub-end point;
and according to the above mode, until an Nth optimal processing path is planned, and the first optimal processing path, the second optimal processing path and the Nth optimal processing path form an optimal processing path.
It should be noted that, in the processing process, there may be one or more cracks, if according to the original processing route, a crack phenomenon is generated due to the influence of the cutting force, if the processing route is continuously adopted for processing, the crack is further extended easily due to the influence of the cutting force, and then the processing route is changed, so that the stress condition of the cutter and the crack position is changed, thereby optimizing the processing route, avoiding the crack phenomenon, further avoiding the crack extension, further cracking the protected blank material, and further damaging the position which does not need to be processed, and the waste of materials can be effectively reduced.
Further, in a preferred embodiment of the present invention, the processing condition in the processing process is obtained in real time, and the evaluation is performed according to the processing condition to obtain the weight value, which specifically includes the following steps:
determining a cutting force vector of each machining position according to the machining route of the machining characteristic elements, and decomposing the cutting force vector into a one-dimensional cutting force vector;
and acquiring the machining condition in the machining process in real time, calculating a weight value, judging whether the one-dimensional cutting force vector can continuously enlarge the formation of cracks or not when the cracks appear in the machining process, and recalculating the weight value.
When a crack occurs, if the processing is performed according to the original processing route, due to the action of the moment in a certain direction of the cutting force, when the moment value in a certain direction exceeds the deformation value that can be borne by the position, the probability value that the position continues to extend in the certain direction is increased, and when the direction points to the direction of the non-processing position of the carbon fiber product, the processing route needs to be readjusted.
Further, in a preferred embodiment of the present invention, the method further comprises the following steps:
after the processing route is adjusted, the processing elements of the product to be processed are identified again;
and reloading the technological schedule according to the processing elements of the product to be processed and adjusting the process steps in each process flow.
It should be noted that, due to the generation of cracks, if the situation that the carbon fiber material is continuously broken may still be unavoidable in the processing process according to the original process flow, due to the cutting force, the grinding force, the drilling force, etc. which are applied to the carbon fiber material by the processing method, a breaking phenomenon has already occurred, the cracks may further extend according to the original processing procedure, and the process steps in the specific process procedure mainly refer to a cutting feed route, a grinding feed route, a drilling feed route, etc. Therefore, the technological process is necessary to be readjusted, on one hand, the rejection rate of parts of the carbon fiber product in the processing process is reduced by readjusting the technological process, and on the other hand, the service performance of the carbon fiber material is improved.
In addition, since the carbon fiber material has the characteristics of high hardness and brittleness in the processing process, the limit load which the carbon fiber can bear is changed due to the temperature change value in the processing process, a certain contact force is formed between the cutting force and the carbon fiber material, and if the contact force is larger than the limit load value, the crack phenomenon is easily caused, so that the cutting force can be adjusted through the change of the temperature value. Thus, the method may further comprise the steps of:
acquiring the limit load value which can be borne by the carbon fiber material at each temperature;
establishing a temperature limit load model based on the limit load value, and acquiring a temperature value of the current carbon fiber processing position;
introducing the temperature value into the temperature limit load model to obtain a limit load value which can be borne by the current machining position;
obtaining a cutting force value of a current machining position, and judging whether the cutting force value is larger than a limit load value which can be borne by the current machining position;
if the cutting force is larger than the predetermined value, the cutting force is adjusted.
The limit load value that the carbon fiber material can bear at each temperature is acquired from a big data network, and the temperature value of the processing position is acquired by using a temperature sensor, a thermosensitive sensor, an infrared sensor and the like, so that the limit load value of the carbon fiber at the temperature is determined, and the cutting force is adjusted.
Fig. 6 shows a block schematic diagram of a data acquisition method for a carbon fiber product.
A third aspect of the present invention provides a data acquisition apparatus for a carbon fiber product, including:
the acquisition module 10 is used for acquiring order information of carbon fiber products;
the identification module 20 is used for identifying the processing elements and the outline dimension information in the order information and establishing a processing model of the product to be processed based on the outline dimension information;
the generating module 30 is used for inputting the processing elements into a processing model of the product to be processed to generate a processing route;
the evaluation module 40 is used for acquiring the processing condition in the processing process in real time and evaluating the processing condition to obtain a weight value;
and the judging module 50 is used for adjusting the processing route in the processing process if the weight value is lower than the preset weight value.
In conclusion, the invention detects the crack phenomenon generated in the processing process of the carbon fiber material, so that the processing route is adjusted according to the position of the crack, thereby not only reducing the fracture phenomenon of the carbon fiber blank material in the processing process, but also reducing the phenomenon that the carbon fiber blank material has to be re-processed when being processed to a certain step, further saving the processing time of the carbon fiber product, further improving the processing efficiency, saving the material cost and reducing the blank rejection rate of the carbon fiber material.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media that can store program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A data acquisition method for carbon fiber products is characterized by comprising the following steps:
acquiring order information of a carbon fiber product;
identifying the processing elements and the outline dimension information in the order information, and establishing a processing model of the product to be processed based on the outline dimension information;
inputting the processing elements into a processing model of the product to be processed to generate a processing route;
acquiring a processing condition in a processing process in real time, and evaluating the processing condition to obtain a weight value;
and if the weight value is lower than the preset weight value, adjusting the processing route in the processing process.
2. The data acquisition method of a carbon fiber product according to claim 1, wherein if the weight value is lower than a preset weight value, the processing route in the processing process is adjusted, and the method specifically comprises the following steps:
acquiring feedback eddy current signal information from a blank material to a carbon fiber product in the processing process;
carrying out numerical simulation analysis on the eddy current signal information to obtain an analysis result, and establishing a stress corrosion crack model based on the analysis result;
obtaining the position relation of each crack in a three-dimensional space from the stress corrosion crack model;
and replanning the processing route in the processing process based on the position relation.
3. The method for acquiring data of a carbon fiber product as claimed in claim 2, wherein the eddy current signal information is subjected to a numerical simulation analysis to obtain an analysis result, and a stress corrosion crack model is established based on the analysis result, specifically comprising the following steps:
carrying out numerical analysis on the eddy current signal by using a finite element dispersion method to obtain a crack eddy current signal;
determining a length, a width, and a depth of the crack based on the crack eddy current signal;
and establishing a stress corrosion crack model according to the length, the width and the depth of the crack.
4. The method for acquiring data of a carbon fiber product according to claim 2, wherein replanning a processing route in a processing process based on the positional relationship comprises:
selecting an initial position of a crack as a first sub-initial point, taking a position point with the farthest distance from the initial position of the crack as a first sub-terminal point, and planning a first optimal processing path for a processing route according to the first sub-initial point and the first sub-terminal point;
taking the first sub-end point as a second sub-starting point, selecting the end position of another crack which is farthest away from the position point of the first sub-end point as a second sub-end point, and planning a second optimal processing path for the processing route according to the second sub-starting point and the second sub-end point;
and according to the above mode, until an Nth optimal processing path is planned, and the first optimal processing path, the second optimal processing path and the Nth optimal processing path form an optimal processing path.
5. The data acquisition method of the carbon fiber product as claimed in claim 1, wherein the processing condition in the processing process is obtained in real time, and is evaluated according to the processing condition to obtain the weight value, and the method specifically comprises the following steps:
determining a cutting force vector of each machining position according to the machining route of the machining characteristic elements, and decomposing the cutting force vector into a one-dimensional cutting force vector;
and acquiring the machining condition in the machining process in real time, calculating a weight value, judging whether the one-dimensional cutting force vector can continuously enlarge the formation of cracks or not when the cracks appear in the machining process, and recalculating the weight value.
6. The method for collecting data on a carbon fiber product as set forth in claim 1, further comprising the steps of:
after the processing route is adjusted, the processing elements of the product to be processed are identified again;
and reloading the technological schedule according to the processing elements of the product to be processed and adjusting the process steps in each process flow.
7. A data acquisition device for a carbon fiber product is characterized by comprising a memory and a processor, wherein the memory comprises a data acquisition method program of the carbon fiber product, and when the data acquisition method program of the carbon fiber product is executed by the processor, the following steps are realized:
acquiring a three-dimensional model of a product to be processed based on a carbon fiber product processing order;
identifying processing elements of the three-dimensional model of the product to be processed, and generating a processing route of processing characteristic elements according to a preset process rule;
acquiring the processing condition in the processing process in real time, and evaluating according to the processing condition to obtain a weight value;
and if the weight value is lower than the preset weight value, adjusting the processing route in the processing process.
8. The data acquisition device of a carbon fiber product according to claim 7, wherein if the weight value is lower than the preset weight value, the processing route in the processing process is adjusted, and the method specifically comprises the following steps:
acquiring feedback eddy current signal information from a blank material to a carbon fiber product in the processing process;
carrying out numerical simulation analysis on the eddy current signal information to obtain an analysis result, and establishing a stress corrosion crack model based on the analysis result;
obtaining the position relation of each crack in a three-dimensional space from the stress corrosion crack model;
and replanning the processing route in the processing process based on the position relation.
9. The data acquisition device for carbon fiber products as claimed in claim 8, wherein the replanning of the processing route during the processing based on the positional relationship comprises:
selecting an initial position of a crack as a first sub-initial point, taking a position point with the farthest distance from the initial position of the crack as a first sub-terminal point, and planning a first optimal processing path for a processing route according to the first sub-initial point and the first sub-terminal point;
taking the first sub-end point as a second sub-starting point, selecting the end position of another crack which is farthest away from the position point of the first sub-end point as a second sub-end point, and planning a second optimal processing path for the processing route according to the second sub-starting point and the second sub-end point;
and according to the above mode, until an Nth optimal processing path is planned, and the first optimal processing path, the second optimal processing path and the Nth optimal processing path form an optimal processing path.
10. A data acquisition device for a carbon fiber product, comprising:
the acquisition module is used for acquiring order information of the carbon fiber product;
the recognition module is used for recognizing the processing elements and the outline dimension information in the order information and establishing a processing model of the product to be processed based on the outline dimension information;
the generating module is used for inputting the processing elements into a processing model of the product to be processed to generate a processing route;
the evaluation module is used for acquiring the processing condition in the processing process in real time and evaluating the processing condition to obtain a weight value;
and the judging module is used for adjusting the processing route in the processing process if the weight value is lower than the preset weight value.
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