CN112974871B - Ultrasonic amplitude transformer numerical control correction structure considering local structure and correction method thereof - Google Patents
Ultrasonic amplitude transformer numerical control correction structure considering local structure and correction method thereof Download PDFInfo
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Abstract
An ultrasonic amplitude transformer numerical control correction structure considering a local structure and a correction method thereof are provided, the numerical control correction structure is suitable for a numerical control lathe and comprises an acoustic vibration component, a special fixture, a conductive slip ring, an impedance analyzer and a PC end, the acoustic vibration component is fixed on a three-jaw chuck through the special fixture, the conductive slip ring is arranged on a left end hollow main shaft of the numerical control lathe, the impedance analyzer is connected with an ultrasonic transducer through the conductive slip ring, the PC end is connected with the impedance analyzer and a numerical control system of the numerical control lathe, the disassembly-free correction of the acoustic vibration component is realized by clamping a flange of the ultrasonic transducer for fixing, the acoustic performance parameters are detected in real time through the use of the conductive slip ring, the influence of the local structure is considered, the precision of a correction model is greatly improved, the correction size calculated by the correction model is corrected, not only the resonance frequency is corrected, but also a displacement node is corrected, not only can independently correct the ultrasonic horn, but also is applicable to the ultrasonic horn with a tool head.
Description
Technical Field
The invention belongs to the technical field of ultrasonic processing, and particularly relates to an ultrasonic amplitude transformer numerical control correction structure considering a local structure and a correction method thereof.
Background
The Nomex honeycomb composite material is an important material in the fields of aviation, aerospace and missile manufacturing, and has the characteristics of light weight, small density, high specific strength, good self-extinguishing property, excellent insulating property and chemical property and the like. The quality defects of deformation, collapse, tearing, napping and the like of the cells of the NOMEX honeycomb can occur by the traditional processing method; aiming at a plurality of problems existing in the traditional Nomex honeycomb processing, the ultrasonic auxiliary cutting processing technology which combines the ultrasonic processing technology and the numerical control processing technology perfectly solves the problems.
Ultrasonic machining systems generally consist of an ultrasonic generator and an acoustic vibration assembly (transducer, horn, tool head). In the whole ultrasonic processing system, high-frequency electric energy provided by an ultrasonic power supply is converted into high-frequency mechanical vibration through a transducer and is transmitted to an amplitude transformer to amplify the amplitude, and a tool head with large amplitude processes materials. In practical application, due to the influences of assembly, local structure, material nonuniformity and Poisson effect, the actual resonant frequency of the theoretically designed ultrasonic amplitude transformer is far lower than the working frequency, and displacement nodes deviate from a flange, so that the problems of power supply mismatching, overlarge vibration at the flange, incapability of meeting the requirements on the amplitude of a tool head and the like are caused. In order to make the performance parameters of the manufactured ultrasonic horn meet the design requirements, the structural dimensions of the ultrasonic horn are generally corrected.
The traditional ultrasonic amplitude transformer correction method is corrected by a trial-repair method, the sizes of the front end and the rear end of the ultrasonic amplitude transformer are machined by clamping for multiple times, and the design requirements can be met by trial cutting and detection for multiple times. The ultrasonic amplitude transformer needs to be continuously assembled and disassembled for processing and detection in the trial repair process, the correction efficiency is low, the precision is low, meanwhile, the problem that the distance of a node is deviated from a flange is uncontrollable can be caused, the position of the flange and the node of the ultrasonic amplitude transformer are deviated, and the flange vibrates excessively.
Disclosure of Invention
In view of the above disadvantages, the technical problem to be solved by the present invention is to provide an ultrasonic horn numerical control correction structure considering a local structure and a correction method thereof, which are used for solving the problems that the error between the resonant frequency of the ultrasonic horn and the design value is large, and the displacement node deviates from the flange position, so that the acoustic vibration component cannot work normally, and the like. The numerical control correction method of the ultrasonic amplitude transformer considering the local structure is provided, so that the resonance frequency can be corrected, and the position of a flange node can be corrected.
In order to solve the technical problems, the invention adopts the technical scheme that,
the numerical control correction structure comprises an acoustic vibration component, a special clamp, a conductive slip ring, an impedance analyzer and a PC (personal computer) end, wherein the acoustic vibration component is fixed on a three-jaw chuck of the numerical control lathe through the special clamp, the conductive slip ring is arranged on a hollow main shaft at the left end of the numerical control lathe, the impedance analyzer is connected with an ultrasonic transducer through the conductive slip ring, and the PC end is connected with the impedance analyzer and a numerical control system of the numerical control lathe.
Furthermore, the acoustic vibration component comprises an ultrasonic transducer and an ultrasonic amplitude transformer, the ultrasonic amplitude transformer is installed on the ultrasonic transducer, and the conductive slip ring is installed on the hollow main shaft at the left end of the numerical control lathe, so that the impedance analyzer can obtain the resonant frequency of the ultrasonic amplitude transformer through the conductive slip ring.
Furthermore, the ultrasonic amplitude transformer comprises an amplitude transformer main body, a connecting screw and a tool head, wherein the connecting screw and the tool head are respectively and fixedly connected to the end surfaces of the two sides of the amplitude transformer main body.
The correction method of the ultrasonic amplitude transformer numerical control correction structure considering the local structure comprises the following steps,
(1) assembling an acoustic vibration assembly;
(2) fixing the acoustic vibration component on a three-jaw chuck of a numerical control lathe through a special clamp;
(3) installing a conductive slip ring, and connecting an impedance analyzer with the ultrasonic transducer through the conductive slip ring;
(4) the PC end controls the impedance analyzer to realize the measurement of the resonance frequency, calculates the correction allowance according to the obtained measurement value and generates a correction program;
(5) and the PC end transmits numerical control programming to a numerical control system of the numerical control lathe to realize allowance correction.
Further, the step (4) comprises a tool-free head correction method and a tool-head correction method.
Further, the tool-less head correction method includes the steps of,
(4.1.1) effectively connecting an ultrasonic horn without a tool head with an ultrasonic transducer, acquiring the resonant frequency of the ultrasonic horn through an impedance analyzer, and deducing a calculation model of an actual equivalent sound velocity through a frequency equation of the horn to obtain the equivalent sound velocity to correct the sound velocity;
(4.1.2) substituting the equivalent sound velocity into a performance parameter calculation model, establishing a correction model, and determining the correction geometric size through an SQP (sequence quadratic programming) optimization algorithm by taking the amplification factor unchanged as a target function and the target resonant frequency and the node position as constraints;
and (4.1.3) carrying out numerical control programming and importing the numerical control program into a numerical control machine tool, carrying out allowance machining, and realizing the correction of the performance parameters of the amplitude transformer.
Further, the tool head correcting method includes the steps of,
(4.2.1) firstly measuring the resonant frequency under the condition that the tool head is not installed, recording the resonant frequency 1, and then obtaining the equivalent sound velocity to carry out sound velocity correction; then connecting the tool head, measuring a resonant frequency 2, substituting the resonant frequency 2 and the equivalent sound velocity into a resonant frequency equation with the tool head, and determining the equivalent radius of the tool head;
(4.2.2) substituting the equivalent sound velocity and the equivalent radius of the tool head into the mechanical four-terminal network model, determining a performance parameter calculation model, establishing a correction model, taking the amplification factor as a target function, taking the target resonance frequency and the midpoint of the flange where the node position is fixed as constraints, and determining the trimming geometric dimension through an SQP (sequence quadratic programming) optimization algorithm;
and (4.2.3) detaching the tool head, and carrying out numerical control programming and importing the tool head into a numerical control machine tool to realize allowance processing and realize correction of the performance parameters of the amplitude transformer.
Furthermore, an SQP optimization algorithm is established by utilizing a calculation model of the ultrasonic amplitude transformer, the minimum difference value before and after the amplification factor correction is taken as a target function, the resonant frequency is taken as a target frequency, and the displacement node falls on the middle point of the flange as a constraint condition.
Further, the parameter calculation model of the ultrasonic horn is as follows:
further, the target frequency F is substituted:
an objective function:
constraint conditions are as follows:
the invention has the beneficial effects that (1) the disassembly-free correction of the acoustic vibration component is realized by clamping and fixing the flange plate of the ultrasonic transducer.
(2) Through the use of the conductive slip ring, the real-time detection of the acoustic performance parameters is realized.
(3) The influence of a local structure is considered, so that the precision of the correction model is greatly improved.
(4) The corrected dimension calculated by the correction model is used for correcting not only the resonance frequency, but also the displacement node.
(5) Not only can independently correct the ultrasonic horn, but also is applicable to the ultrasonic horn with a tool head.
(6) The SQP optimization algorithm is utilized, and the calculation speed and accuracy of the calculation model are greatly improved.
Drawings
FIG. 1 is a block diagram of a digital control correction system for an ultrasonic horn of the present invention.
FIG. 2 is a flow chart of a system for modifying an ultrasonic horn of the present invention.
Fig. 3 is a schematic view of the conical ultrasonic horn with a tool head of the present invention in consideration of a partial structure.
Fig. 4 is a model diagram of equivalent sound velocity and resonance frequency of the ultrasonic horn in the state of removing the tool head.
Fig. 5 is a model diagram showing the equivalent radius and resonant frequency of the ultrasonic horn tool head in the state where the tool head is mounted on the ultrasonic horn.
FIG. 6 is a model diagram of displacement nodes and magnification of the present invention.
Fig. 7 is a partially cut-away view of fig. 6.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in FIG. 1, the ultrasonic amplitude transformer numerical control correction structure considering the local structure is suitable for a numerical control lathe 3 and comprises an acoustic vibration component 1, a special clamp 2, a conductive slip ring 4, an impedance analyzer 5 and a PC (personal computer) end 6, wherein the acoustic vibration component 1 is fixed on a three-jaw chuck 9 of the numerical control lathe through the special clamp 2, the conductive slip ring 4 is installed on a hollow main shaft at the left end of the numerical control lathe 3, the impedance analyzer 5 is connected with an ultrasonic transducer 8 through the conductive slip ring 4, and the PC end 6 is connected with the impedance analyzer 5 and a numerical control system 10 of the numerical control lathe.
The acoustic vibration component 1 comprises an ultrasonic transducer 8 and an ultrasonic amplitude transformer 7, the ultrasonic amplitude transformer 7 is installed on the ultrasonic transducer 8, the special clamp 2 clamps the acoustic vibration component 1 and fixes the acoustic vibration component on a three-jaw chuck 9 of a numerical control lathe, the conductive slip ring 4 is installed on a hollow main shaft at the left end of the numerical control lathe 3, and preferably, the conductive slip ring 4 is connected with the ultrasonic transducer 8 and the impedance analyzer 5 so that the impedance analyzer 5 can obtain the resonant frequency of the ultrasonic amplitude transformer 7 through the conductive slip ring 4.
As shown in fig. 3, the ultrasonic horn 7 includes a horn body 11, a connecting screw 12 and a tool head 13, and the connecting screw 12 and the tool head 13 are fixedly connected to both side end faces of the horn body 11, respectively.
The correction method of the ultrasonic amplitude transformer numerical control correction structure considering the local structure comprises the following steps,
(1) assembling an acoustic vibration assembly;
(2) fixing the acoustic vibration component on a three-jaw chuck of a numerical control lathe through a special clamp;
(3) installing a conductive slip ring, and connecting an impedance analyzer with the ultrasonic transducer through the conductive slip ring;
(4) the PC end controls the impedance analyzer to realize the measurement of the resonance frequency, calculates the correction allowance according to the obtained measurement value and generates a correction program;
(5) and the PC end transmits numerical control programming to the numerical control lathe system to realize allowance correction.
And (4) a tool-head-free correction method and a tool-head correction method are included.
As shown in fig. 2, the tool-less-head correction method includes the steps of,
(4.1.1) effectively connecting an ultrasonic horn without a tool head with an ultrasonic transducer, acquiring the resonant frequency of the ultrasonic horn through an impedance analyzer, and deducing a calculation model of an actual equivalent sound velocity through a frequency equation of the horn to obtain the equivalent sound velocity to correct the sound velocity;
(4.1.2) substituting the equivalent sound velocity into a performance parameter calculation model, establishing a correction model, and determining the correction geometric size through an SQP (sequence quadratic programming) optimization algorithm by taking the amplification factor unchanged as a target function and the target resonant frequency and the node position as constraints;
and (4.1.3) carrying out numerical control programming and importing the numerical control program into a numerical control machine tool, carrying out allowance machining, and realizing the correction of the performance parameters of the amplitude transformer.
As shown in fig. 2, the tool head revision method includes the steps of,
(4.2.1) firstly measuring the resonant frequency under the condition that the tool head is not installed, recording the resonant frequency 1, and then obtaining the equivalent sound velocity to carry out sound velocity correction; then, mounting the tool head, measuring a resonant frequency 2, substituting the resonant frequency 2 and the equivalent sound velocity into a resonant frequency equation with the tool head, and determining the equivalent radius of the tool head;
(4.2.2) substituting the equivalent sound velocity and the equivalent radius of the tool head into the mechanical four-terminal network model, determining a performance parameter calculation model, establishing a correction model, taking the amplification factor as a target function, taking the target resonance frequency and the midpoint of the flange where the node position is fixed as constraints, and determining the trimming geometric dimension through an SQP (sequence quadratic programming) optimization algorithm;
and (4.2.3) detaching the tool head, and carrying out numerical control programming and importing the tool head into a numerical control machine tool to realize allowance processing and realize correction of the performance parameters of the amplitude transformer.
As shown in fig. 4 and 5, the model diagrams of the equivalent sound velocity, the equivalent tool radius and the resonant frequency provided in this embodiment are shown. The connecting screw is regarded as a mass block and is equivalent to a small segment of a circle with the diameter equal to the diameter of the large end of the amplitude transformer, and the equivalent front and rear mass is unchanged; regarding the part of the threaded hole as a hollow section end; in the calculation of the resonant frequency, the structure mutation is discontinuous, the stress is concentrated and the like in the calculation of the theoretical calculation resonant frequency is higher, and the theoretical calculation resonant frequency can be ignored; the tool head is equivalent to a section of cylinder (the length is equal to the size of the tool head, and the diameter is obtained by a calculation model).
Calculating equivalent sound velocity of the amplitude transformer, and utilizing four times of the model diagram of figure 4 and the structural size of the ultrasonic amplitude transformerThe terminal network and the matrix transfer method can write the expression of the resonant frequency 1 and the equivalent sound velocity of the tool head without the tool head, namely the value of the circular wave number. The resonant frequency 1 (f) was measured by an impedance analyzerMeasuring) An equivalent sound speed can be calculated.
Four-terminal network and matrix transmission method:
in the formula: f1、F2Respectively stress the starting end and the tail end of the amplitude transformer; v1、V2Respectively the velocities of particles at the beginning and the end of the amplitude transformer; a' is a parameter matrix of the amplitude transformer four-terminal network in FIG. 4; a. theiA four-terminal network parameter matrix for each section of the horn of fig. 4; .
Figure 4 model number of circles:
in the formula: r is all radial dimensions of the horn of FIG. 4; l is the overall length dimension of the horn of fig. 4.
Equivalent sound velocity:
and (3) calculating the equivalent radius of the tool head, and writing an expression of the resonant frequency 2 with the tool head and the equivalent radius of the tool head by using a four-terminal network and a matrix transmission method according to the model diagram of fig. 5 and the structural size of the ultrasonic amplitude transformer. Resonant frequency 2(f 'was measured with an impedance analyzer'Measuring) The equivalent radius of the tool head can be calculated.
Four-terminal network and matrix transmission method:
figure 5 model number of circles:
tool head equivalent radius:
meanwhile, an expression of the resonance frequency of the ultrasonic horn is obtained from fig. 5:
A12(k1,r,l,x)＝0
as shown in fig. 6 and 7, the ultrasonic horn displacement node and magnification model diagram provided by this embodiment is shown. The addition of the flange enables the theoretical value of the resonance frequency to be higher, but enables the displacement node to be closer to the actual value; the influence of the flange on the amplification factor is small and negligible, and for the convenience of calculation, the invention is calculated by using model diagrams of fig. 6 and 7, when ultrasonic waves are transmitted, only half of screws in the amplitude transformer vibrate together with the amplitude transformer, and the other half of the screws vibrate together with the transducer, so that only half of the length of the equivalent screws is considered.
And calculating displacement nodes of the amplitude transformer, wherein the displacement nodes can be obtained by using four-terminal networks and a matrix transmission method according to the model diagrams of figures 6 and 7 and the structural size of the ultrasonic amplitude transformer. Since the displacement node is a point on the horn where the displacement or velocity is zero, and is generally taken at the flange section, the sampling calculation is performed in this embodiment by taking the node at the flange section as an example, and the thickness value on the flange is taken as an object X to perform the sampling calculation from the large end to the small end.
Figure 6 model number of circles:
in the formula: b is the four-terminal network parameter matrix of the horn of fig. 6.
Since the displacement node is the point of zero displacement in the model diagram of fig. 6, the model diagram shown in fig. 7 is intercepted to calculate the displacement node.
Displacement node:
the magnification is obtained by using the four-terminal network and the matrix transmission method according to the model diagram of fig. 6 and the structural size of the ultrasonic horn.
Magnification:
the parameter calculation model of the fixed ultrasonic amplitude transformer is as follows:
and (3) building an SQP correction model by using the calculation model of the ultrasonic amplitude transformer, taking the minimum difference value before and after the amplification correction as a target function, taking the resonant frequency as the target frequency and taking the displacement node falling in the middle point of the flange as a constraint condition. And substituting the target frequency into a resonance frequency equation to realize resonance frequency constraint, and quantifying the flange size X to be L/2 to realize node constraint. For the selection of the size variable of the amplitude transformer, in order to realize the correction of the amplitude transformer without disassembly, the variable size of the selected amplitude transformer needs to meet the requirement that the distance from the right side of the flange to the transducer is kept unchanged, the radius of the large end of the amplitude transformer which is only in a single shape on the right side of the flange is selected, and the length of the left side and the radius of the small end of the amplitude transformer on the left side of the flange are selected.
Substituting the target frequency F into:
an objective function:
constraint conditions are as follows:
in the formula: r' is the radius size of the amplitude transformer after correction; l' is the length dimension of the amplitude transformer after correction.
In numerical control programming, G73 can be applied to more widely traveling wavy lines. The invention aims to correct the amplitude transformer processed by the method, so that the cutting amount required is relatively small, and the G73 cycle processing mode is adopted, and the processing programming time is relatively short. Meanwhile, for the surface of a part with a complex function, the precision of the machining allowance is improved by adopting a programming mode of a macro program.
And for the programmed text, the DNC on-line processing is realized by importing the programmed text into a control system of a numerical control machine through communication software, so that the production efficiency is greatly improved.
For the ultrasonic amplitude transformer correction without a tool head, the calculation of the equivalent radius of the tool head is omitted.
The invention relates to a correction example of a conical ultrasonic amplitude transformer with a tool head, which comprises the following steps:
(1) fixing the transducer with the flange plate on a special fixture for a numerical control machine tool, and effectively connecting the ultrasonic amplitude transformer with lubrication according to the pretightening force of 50 N.M;
(2) arranging a conductive slip ring at the rear side of the hollow main shaft of the numerical control machine tool to realize rotary conduction, and respectively connecting the positive electrode and the negative electrode of the transducer with the positive electrode and the negative electrode of the impedance analyzer through the conductive slip ring;
(3) and inputting corresponding ultrasonic amplitude transformer parameters and target frequency values in correction software. Target frequency: 20000Hz screw parameters: length 35mm, material No. 45 steel; length of the cutter: length LD is 37 mm; ultrasonic amplitude transformer parameters: material No. 45 steel, screw hole size: the radius R3 of the big end hole is 6.35mm, and the depth L1 of the big end hole is 20 mm; the radius R8 of the small-end hole is 4.8mm, and the depth L4 of the small-end hole is 20 mm; the size of the flange is as follows: the radius R of the flange is 30mm, and the thickness L of the flange is 4 mm; basic size: the radius of the large end R1 is 25mm, and the radius of the small end R7 is 15 mm; the length L1+ L2 of the left end of the flange is 78.84mm, and the length L3+ L4 of the right end of the flange is 71.39 mm;
(4) the measured resonant frequency value 1 is 19886 Hz; connecting the tool head by using a pre-tightening torque of 25N.M, testing to realize that the resonant frequency 2 of the ultrasonic amplitude transformer with the cutter is 19369Hz, and then detaching the cutter;
(5) the equivalent thickness x of the screw in the calculation model can be determined to be 2.26mm according to the size and the material parameters of the screw; the equivalent sound velocity in the amplitude transformer is 5.416 x 10 x 6mm/s, which can be determined by the resonance frequency value 1 and a calculation model of the amplitude transformer without a cutter; the equivalent radius of the cutter can be determined to be 4.03mm by the resonance frequency value 2 and a calculation model of the amplitude transformer with the tool head; calculating the correction size of the amplitude transformer according to the target frequency value 20000Hz and the SQP optimization algorithm;
(6) automatically correcting the built-in G73 programming code by the corrected dimension to realize the generation of numerical control program code for correcting the allowance; and transmitting the DNC to a numerical control machine tool system to realize DNC on-line processing. After the correction is completed, the software further detects the resonant frequency of the acoustic vibration component, and when the error between the detection result and the target value is larger than 10Hz, the steps and the program are restarted.
(7) The corrected resonant frequency value is 19998.8Hz, and is only 1.2Hz different from the target value of 20000 Hz. The result shows the accuracy of the correction system for the resonance frequency of the amplitude transformer; applying 15w of power supply power to the acoustic vibration assembly before and after correction, wherein the amplitude of the cutter point is about 35 mu m before and after correction, and the displacement amplitude of the amplitude transformer flange before correction is close to 3 mu m; the displacement amplitude of the amplitude transformer flange after correction is less than 1 mu m, and the result shows the accuracy of the correction system for the displacement node.
Size comparison before and after correction of conical amplitude transformer with tool head
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the terms corresponding to the reference numerals in the figures are used more herein, the possibility of using other terms is not excluded; these terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (6)
1. A correction method of an ultrasonic amplitude transformer numerical control correction structure considering a local structure is suitable for a numerical control lathe (3), an acoustic vibration component (1), a special clamp (2), a conductive slip ring (4), an impedance analyzer (5) and a PC (personal computer) end (6), wherein the acoustic vibration component (1) is fixed on a three-jaw chuck (9) of the numerical control lathe through the special clamp (2), the conductive slip ring (4) is installed on a hollow main shaft at the left end of the numerical control lathe (3), the impedance analyzer (5) is connected with an ultrasonic transducer (8) through the conductive slip ring (4), and the PC end (6) is connected with the impedance analyzer (5) and a numerical control system (10) of the numerical control lathe, and is characterized by comprising the following steps,
(1) assembling an acoustic vibration assembly;
(2) fixing the acoustic vibration component on a three-jaw chuck of a numerical control lathe through a special clamp;
(3) installing a conductive slip ring, and connecting an impedance analyzer with the ultrasonic transducer through the conductive slip ring;
(4) the PC end controls the impedance analyzer to realize the measurement of the resonance frequency, calculates the correction allowance according to the obtained measurement value and generates a correction program;
(5) the PC end transmits numerical control programming to a numerical control system of the numerical control lathe to realize allowance correction;
step (4) comprises a correction method without a tool head and a correction method with a tool head;
the tool-less-head correction method includes the steps of,
(4.1.1) effectively connecting an ultrasonic horn without a tool head with an ultrasonic transducer, acquiring the resonant frequency of the ultrasonic horn through an impedance analyzer, and deducing a calculation model of an actual equivalent sound velocity through a frequency equation of the horn to obtain the equivalent sound velocity to correct the sound velocity;
(4.1.2) substituting the equivalent sound velocity into a performance parameter calculation model, establishing a correction model, and determining the correction geometric size through an SQP (sequence quadratic programming) optimization algorithm by taking the amplification factor unchanged as a target function and the target resonant frequency and the node position as constraints;
and (4.1.3) carrying out numerical control programming and importing the numerical control program into a numerical control machine tool, carrying out allowance machining, and realizing the correction of the performance parameters of the amplitude transformer.
2. The method for correcting the numerical control structure of the ultrasonic horn considering the local structure is characterized in that the acoustic vibration assembly comprises an ultrasonic transducer (8) and the ultrasonic horn (7), the ultrasonic horn (7) is installed on the ultrasonic transducer (8), and the conductive slip ring (4) is installed on the hollow main shaft at the left end of the numerical control lathe (3), so that the impedance analyzer (5) obtains the resonant frequency of the ultrasonic horn (7) through the conductive slip ring (4).
3. The correction method of the numerical control correction structure of the ultrasonic horn considering the local structure as claimed in claim 2, characterized in that the ultrasonic horn (7) comprises a horn main body (11), a connecting screw (12) and a tool head (13), and the connecting screw (12) and the tool head (13) are respectively and fixedly connected to the two side end faces of the horn main body.
4. The method for correcting the numerical control structure of the ultrasonic horn considering the local structure as claimed in any one of claims 1 to 3, wherein the method for correcting the numerical control structure of the ultrasonic horn with the tool head comprises the following steps,
(4.2.1) firstly measuring the resonant frequency under the condition that the tool head is not installed, recording the resonant frequency 1, and then obtaining the equivalent sound velocity to carry out sound velocity correction; then connecting the tool head, measuring a resonant frequency 2, substituting the resonant frequency 2 and the equivalent sound velocity into a resonant frequency equation with the tool head, and determining the equivalent radius of the tool head;
(4.2.2) substituting the equivalent sound velocity and the equivalent radius of the tool head into the mechanical four-terminal network model, determining a performance parameter calculation model, establishing a correction model, taking the amplification factor as a target function, taking the target resonance frequency and the midpoint of the flange where the node position is fixed as constraints, and determining the trimming geometric dimension through an SQP (sequence quadratic programming) optimization algorithm;
and (4.2.3) detaching the tool head, and importing the tool head into a numerical control machine tool for numerical control programming to realize allowance machining and realize correction of the performance parameters of the amplitude transformer.
5. The method for modifying an ultrasonic horn numerical control modification structure considering a local structure according to any one of claims 1 to 3,
the performance parameter calculation model of the ultrasonic amplitude transformer is as follows:
6. the method for modifying an ultrasonic horn numerical control modification structure considering a local structure according to any one of claims 1 to 3,
substituting the target frequency F into:
an objective function:
constraint conditions are as follows:
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