Alternating vibration and mixed frequency beat vibration combined ultrasonic-assisted compression molding device and method

Abstract

The invention provides an ultrasonic-assisted compression molding device and method combining alternate vibration and mixed frequency beat vibration, and relates to the technical field of ultrasonic-assisted compression molding, the ultrasonic-assisted compression molding device comprises a compression molding mold, an ultrasonic vibration device and a driving system, and the ultrasonic vibration device is electrically connected with the driving system; the ultrasonic vibration device comprises a plurality of ultrasonic vibration assemblies arranged in the circumferential direction of the compression molding mold, and all the ultrasonic vibration assemblies are driven by the driving system to vibrate alternately in sequence; each ultrasonic vibration assembly comprises vibration units oppositely arranged on the two sides of the compression molding mold, and the two vibration units corresponding to the same ultrasonic vibration assembly are driven by the driving system to vibrate in a staggered frequency mode. The heating degree of the magnetostriction transducer can be remarkably reduced, long-time stable and efficient work is guaranteed, pulsation amplitude vibration can be formed, the damping resistance is enhanced, the vibration intensity of a mold is improved, meanwhile, vibration energy distribution is more uniform, and the forming stability is improved.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic-assisted molding technology, specifically to an ultrasonic-assisted molding device and method that combines alternating vibration and mixed-frequency beat vibration. Background Technology

[0002] Ultrasonic vibration-assisted molding is an effective means of increasing the density of pressed blanks in the molding process of materials such as PBX granules, and has become an indispensable process element in related molding production. In the existing technology, multiple ultrasonic transducers are usually installed on the molding die. The vibration of the transducers causes the die to resonate. The synergistic effect of multiple ultrasonic transducers increases the vibration energy acting on the die. At the same time, the superposition of vibrations forms a resultant force to increase the deformation of the die in a specific direction, thereby reducing the friction between the die and the molded granules, and between the granules themselves, and improving the density of the pressed blank.

[0003] Currently, most existing technologies use magnetostrictive transducers with high stiffness as oscillators. The core structure of this type of transducer is usually a multi-layer iron core made of rare-earth element-containing super magnetostrictive material, welded together with an iron-based alloy amplitude transformer. By passing current through the iron core winding to generate a magnetic field, the magnetostrictive strain characteristics of the super magnetostrictive material are used to cause the iron core to expand and contract, and the vibration is amplified by the amplitude transformer and transmitted to the mold.

[0004] However, existing ultrasonic-assisted molding technology using magnetostrictive transducers still has significant drawbacks: On the one hand, due to the resistance of the winding wires in the magnetostrictive transducer and the specific structure of the core, the electrical energy applied during operation inevitably generates copper losses and eddy current losses. These losses are converted into heat energy, causing the overall temperature of the transducer to rise. When the temperature rises to the Curie temperature of the material, the magnetostrictive properties of the supermagnetostrictive material will decrease significantly, directly resulting in a weakening of the transducer's vibration effect and a significant reduction in its working efficiency. Although existing technologies use liquid cooling to attempt to reduce the temperature of the transducer's core windings, this only achieves localized cooling and cannot fundamentally solve the problem of heat generation from losses, making it difficult to ensure the transducer's stable operation over a long period of time.

[0005] On the other hand, the pressure applied to the mold by the press has a significant suppressive effect on mold vibration, which is equivalent to forming a damping force that hinders mold vibration. In the prior art, multiple transducers usually output vibrations of the same frequency simultaneously, which, when superimposed on the mold, form vibrations with a constant peak amplitude. This type of vibration with a constant peak amplitude is not very effective in counteracting damping forces. Under the same power input conditions, it is difficult to generate sufficiently intense vibrations in the mold, thus limiting further improvement in the compactness of the pressed blank.

[0006] Therefore, how to solve the problem of decreased heating efficiency of magnetostrictive transducers during long-term operation, and at the same time optimize the superposition form of vibration sources to enhance damping resistance, has become a key bottleneck that needs to be overcome in the existing ultrasonic-assisted molding technology. Summary of the Invention

[0007] The purpose of this invention is to provide an ultrasonic-assisted molding device that combines alternating vibration and mixed-frequency beat vibration to solve the above-mentioned technical problems in the prior art; the preferred technical solutions among the many technical solutions provided by this invention can produce many technical effects, as detailed below.

[0008] To achieve the above objectives, the present invention provides the following technical solution: This invention provides an ultrasonic-assisted molding device combining alternating vibration and mixed-frequency beat vibration, comprising a molding die, an ultrasonic vibration device, and a driving system, wherein: the ultrasonic vibration device is electrically connected to the driving system; the ultrasonic vibration device includes a plurality of ultrasonic vibration components uniformly arranged along the circumference of the molding die, and all the ultrasonic vibration components vibrate alternately in sequence under the drive of the driving system; each ultrasonic vibration component includes vibration units disposed opposite to each other on both sides of the molding die, and two vibration units corresponding to the same ultrasonic vibration component vibrate at different frequencies under the drive of the driving system.

[0009] Preferably, the vibration unit is configured as a magnetostrictive ultrasonic transducer.

[0010] Preferably, when all the ultrasonic vibration components vibrate alternately in sequence, the vibrations output by the ultrasonic vibration components are in phase and at the same frequency.

[0011] Preferably, the driving system includes a signal generation module and a power driving module, wherein: the signal generation module is electrically connected to the power driving module, and the vibration unit is electrically connected to the power driving module; the signal generation module is used to output a pulse square wave control signal and a frequency-shifting drive signal; the power driving module drives all the ultrasonic vibration components to vibrate alternately in sequence according to the pulse square wave control signal; and the power driving module drives two vibration units corresponding to the same ultrasonic vibration component to vibrate at a different frequency according to the frequency-shifting drive signal.

[0012] Preferably, the signal generation module is configured as a DDS digital signal source, which has a built-in timer for generating a synchronous trigger signal to control the vibration of the ultrasonic vibration component.

[0013] Preferably, the power drive module includes multiple power drive units, the number of which is the same as the number of vibration units, and they correspond one-to-one.

[0014] Preferably, the driving system outputs driving frequencies to the two vibration units corresponding to the same ultrasonic vibration component at the following frequencies: and The vibration amplitudes of the two vibration units acting on the molding die are respectively and , and The waveform equation after superposition is: .

[0015] Preferably, the number of ultrasonic vibration components is set to 3.

[0016] This invention provides an ultrasonic-assisted molding method combining alternating vibration and frequency mixing, implemented using any of the aforementioned devices, and comprising at least the following steps: Step 1: Select the frequency with a clearly defined peak amplitude of the molding die as the fundamental resonant frequency. ; Step 2: Drive the ultrasonic vibration component through the drive system to cyclically vibrate alternately in a working cycle T0. The drive system drives two vibration units of the same ultrasonic vibration assembly to vibrate at different frequencies, with one of the two vibration units using the fundamental resonant frequency. Another vibration frequency .

[0017] Preferably, the frequency at which the peak amplitude of the molding die is selected is the fundamental resonant frequency. This includes: performing modal analysis and harmonic response analysis on the molding die using finite element simulation software, and selecting frequencies with good vibration consistency, uniform stress distribution, and large peak amplitude as the fundamental resonant frequencies.

[0018] The ultrasonic-assisted molding apparatus and method combining alternating vibration and mixed-frequency beat vibration provided by the present invention have at least the following beneficial effects: I. Significantly reduces the heat generation of the magnetostrictive transducer, ensuring stable and efficient operation over long periods: In this device, multiple ultrasonic vibration components are arranged circumferentially along the molding die and vibrate alternately in sequence under the drive system. This alternating vibration mode allows each ultrasonic vibration component to operate in a "work-intermittent" cycle rather than continuously, significantly reducing the cumulative working time of a single magnetostrictive transducer. This significantly reduces the total heat generated by the transducer due to copper and eddy current losses, preventing the temperature from rising to the Curie temperature point, effectively maintaining the magnetostrictive properties of the supermagnetostrictive material, and ensuring stable vibration performance and operating efficiency of the transducer during long-term operation. It fundamentally alleviates the heat generation problem without relying on complex heat dissipation structures.

[0019] II. It generates pulsating amplitude vibration, enhances damping resistance, and increases the intensity of mold vibration: In this device, two vibration units of the same ultrasonic vibration component are positioned opposite each other on both sides of the mold and vibrate at different frequencies under the drive system. Combined with the alternating vibration of multiple components, this creates a complex coupling and superposition effect of multiple vibration sources on the mold. This superposition method breaks away from the constant amplitude peak vibration pattern in existing technologies, ultimately forming pulsating amplitude vibration on the mold. Compared to constant peak vibration, pulsating amplitude vibration, under the same power input conditions, can more effectively counteract the damping force generated by the molding pressure, effectively overcoming the damping suppression effect and causing the mold to vibrate more violently. This further reduces the friction between the mold and particles, and between particles themselves, promoting material flow and densification, and significantly improving the density uniformity and overall quality of the pressed compact.

[0020] III. More uniform vibration energy distribution, improving molding stability: Multiple ultrasonic vibration components are evenly arranged along the circumference of the mold. The combined effect of alternating vibration and staggered frequency vibration ensures that vibration energy is evenly distributed to all areas of the mold, avoiding localized concentration of vibration energy. At the same time, the uniform distribution of pulsating amplitude vibration ensures that all parts of the mold can generate effective and intense vibration, further improving the stability of the compression molding process and reducing blank defects caused by insufficient local vibration. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 and Figure 2 This is a schematic diagram of the structure of the device of the present invention; Figure 3This is an assembly diagram of the molding die and ultrasonic vibration device of the present invention; Figure 4 This is an assembly diagram of the vibration unit of the present invention; Figure 5 This is a timing diagram of the synchronous trigger pulse signals for the alternating vibration of multiple ultrasonic vibration components in this invention; Figure 6 This is a timing diagram of the synchronous triggering power output signal of multiple ultrasonic vibration components in this invention. Figure 7 This is a waveform diagram of the beat vibration signal of the two vibration units of the present invention with misaligned frequencies superimposed; Figure 8 This is the harmonic response analysis curve of the vibration mode of the molding die of this invention; Figure 9 This is a simulation diagram of the mold vibration during three working cycles without using the misaligned frequency superposition beat vibration of the present invention; Figure 10 This is a simulation diagram of the mold vibration during three working cycles using the staggered frequency superposition beat vibration method of this invention.

[0023] Figure Labels 1. Compression molding die; 2. Ultrasonic vibration device; 21. Ultrasonic vibration component; 211. Vibration unit; 3. Drive system; 31. Signal generation module; 311. DDS digital signal source; 32. Power drive module; 321. Drive unit. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] Example 1: This invention provides an ultrasonic-assisted molding device that combines alternating vibration and frequency mixing beat vibration, referenced Figures 1 to 10 As shown, the ultrasonic-assisted molding device combining alternating vibration and mixed-frequency beat vibration includes a molding die 1, an ultrasonic vibration device 2, and a drive system 3.

[0026] The ultrasonic vibration device 2 is electrically connected to the drive system 3. The ultrasonic vibration device 2 includes a plurality of ultrasonic vibration components 21 evenly arranged along the circumference of the molding die 1. Each ultrasonic vibration component 21 includes vibration units 211 arranged opposite to each other on both sides of the molding die 1. That is, the ultrasonic vibration device 2 has an even number of vibration units 211. All vibration units 211 are arranged along the circumference of the molding die 1, and two opposite vibration units 211 located on the same straight line are ultrasonic vibration components 21.

[0027] During operation, the drive system 3 drives all ultrasonic vibration components 21 to vibrate alternately in a cyclic manner. At the same time, the two vibration units 211 corresponding to the same ultrasonic vibration component 21 vibrate at different frequencies.

[0028] In the aforementioned process, the ultrasonic vibration component 21 vibrates alternately at a certain frequency in an intermittent vibration mode, which can effectively spread the entire working time and greatly reduce the working time of a single vibration unit 211, thereby significantly reducing the heat generation of the vibration unit 211 and ensuring its vibration effect and working efficiency.

[0029] Meanwhile, the two corresponding vibration units 211 of the same ultrasonic vibration component 21 are arranged opposite each other with an effective interval between them, so they do not interfere with each other. Moreover, they vibrate at different frequencies, which can form mixed frequency beat vibration. The combination of alternating vibration and mixed frequency beat vibration creates a complex coupling and superposition effect on the mold. Compared with the existing technology, it has a larger amplitude under the same driving power, thereby effectively promoting the flow and densification of materials and significantly improving the density uniformity and overall quality of the pressed blank.

[0030] Example 2: Example 2 is based on Example 1: like Figures 1 to 10 As shown, the vibration unit 211 is configured as a magnetostrictive ultrasonic transducer.

[0031] The molding die 1 is made of high-strength mold steel C300 and is cylindrical with an inner diameter of 110mm, an outer diameter of 290mm, and a height of 520mm. The molding die 1 has mounting holes on its peripheral wall, and the magnetostrictive ultrasonic transducer is threaded onto the mounting holes.

[0032] As an optional implementation, when all ultrasonic vibration components 21 vibrate alternately in sequence, the vibrations output by the ultrasonic vibration components 21 are in the same frequency and phase.

[0033] The same-frequency and same-phase vibration mode ensures that the vibration energy transmitted to the mold during the alternating operation of each component can be superimposed in an orderly manner, avoiding energy cancellation caused by the vibration frequency or phase disorder of different components. Furthermore, the alternating vibration with the same frequency and phase can also enable the mold to form a stable periodic vibration response, improving the utilization efficiency of vibration energy. At the same time, the stable frequency and phase characteristics facilitate precise control of the drive system 3, reduce the complexity of the control logic, ensure the orderly implementation of the alternating vibration mode, further enhance the cooling effect brought by the "work-intermittent" cycle, ensure the consistency of the working state of each component, and avoid the problem of insufficient or excessive vibration in some areas due to differences in vibration parameters.

[0034] As an optional implementation, the drive system 3 includes a signal generation module 31 and a power drive module 32, with the signal generation module 31 electrically connected to the power drive module 32, and the vibration unit 211 electrically connected to the power drive module 32.

[0035] The signal generation module 31 is used to output pulse square wave control signal and frequency misalignment drive signal. During operation, the power drive module 32 drives all ultrasonic vibration components 21 to vibrate alternately in sequence according to the pulse square wave control signal. The power drive module 32 drives the two vibration units 211 corresponding to the same ultrasonic vibration component 21 to vibrate at a different frequency according to the frequency misalignment drive signal.

[0036] The signal generation module 31 and the power drive module 32 work together to ensure the timing control accuracy of alternating vibration and the frequency difference accuracy of mis-frequency vibration, providing core signal support for accurately achieving the synergistic effect of "alternating vibration + mixed frequency beat vibration".

[0037] As an optional implementation, the power drive module 32 includes a plurality of power drive units 321, the number of which is the same as the number of vibration units 211, and they correspond one-to-one.

[0038] like Figure 5 As shown, during operation, each power drive unit 321 converts the square wave signal into a sinusoidal power signal with the same frequency and amplified amplitude, and inputs it into the winding of the corresponding magnetostrictive ultrasonic transducer.

[0039] As an optional implementation, the signal generation module 31 is configured as a DDS digital signal source 311.

[0040] By utilizing the high-precision frequency synthesis characteristics of DDS technology, it is possible to generate frequency-stability and phase-controllable mis-frequency drive signals and pulse square wave control signals, which can significantly improve the control accuracy of vibration parameters, ensure the stability of the frequency error difference between the two vibration units 211 of the same component, and ensure the precise timing of the alternating vibration of each component, thereby further optimizing the mixing beat vibration effect and the alternating cooling effect.

[0041] The DDS digital signal source 311 has a built-in timer that can send a synchronization signal SYNC to alternately trigger the opening and closing of multiple sets of square wave signal outputs.

[0042] Taking the ultrasonic vibration device 2, which includes three ultrasonic vibration components 21, as an example, the three ultrasonic vibration components 21 are group A, group B, and group C, respectively. Groups A, B, and C oscillate alternately in sequence with a working cycle T0, as follows: When the timer starts, the A group square wave signal output is enabled; When the running time T=T0, the output of group A is turned off, the output of group B is started at the same time, and the timer is reset to zero; When the running time reaches T=T0 again, the output of group B is turned off, the output of group C is started, and the timer is reset to zero. When the running time reaches T=T0 again, the output of group C is completed and turned off, the timer is reset to zero, and the output of group A signal is restarted.

[0043] This process repeats itself, forming something like... Figure 6 The three sets of signals shown control the alternating output mode.

[0044] As an optional implementation, the drive system 3 outputs drive frequencies to the two vibration units 211 corresponding to the same ultrasonic vibration component 21, respectively. and The vibration amplitudes of the two vibration units 211 acting on the molding die 1 are respectively and ,in: ; ; According to the sum-to-product formula and The waveform equation after superposition is: .

[0045] By using frequency superposition, the peak vibration amplitude generated by the molding die 1 is made to fluctuate, which can better resist the damping generated by the die pressure. The superimposed vibration on the die sleeve makes the vibration of the die more intense and improves the ultrasonic-assisted effect.

[0046] Example 3 Example 3 is based on Example 2: This invention provides an ultrasonic-assisted molding method combining alternating vibration and frequency mixing, comprising at least the following steps: Step 1: Select the frequency with a clearly defined peak amplitude of the molding die 1 as the fundamental resonant frequency. ; Step 2: Drive the ultrasonic vibration component 21 through the drive system 3 to cyclically vibrate alternately in a working cycle T0. The drive system 3 drives two vibration units 211 of the same ultrasonic vibration component 21 to vibrate at different frequencies, with one of the two vibration units 211 using the fundamental resonant frequency. Another vibration frequency .

[0047] Example 4 Example 4 is based on Example 3: This invention provides an ultrasonic-assisted molding method combining alternating vibration and frequency mixing, comprising at least the following steps: Step 1: Modal analysis and harmonic response analysis of the molding die 1 were performed using finite element simulation software. The frequency range with peak amplitude was confirmed to be 25200~25700Hz. At a peak amplitude frequency of 25460Hz, the vibration consistency was good, the stress distribution was uniform, and the peak amplitude was relatively large, corresponding to a peak amplitude of 15.73μm. This frequency was selected as the fundamental resonant frequency. .

[0048] Step 2: Drive the ultrasonic vibration component 21 through the drive system 3 to cyclically vibrate alternately in a working cycle T0. The drive system 3 drives two vibration units 211 of the same ultrasonic vibration component 21 to vibrate at different frequencies, with one of the two vibration units 211 having a fundamental resonant frequency. Another vibration frequency The frequency error difference ∆f is taken as 2Hz, and the vibration amplitudes of the two vibration units 211 acting on the molding die 1 are respectively and The waveform equation after superposition satisfies: ; Pick =0, then:

[0049]

[0050]

[0051] Therefore, the frequency of the beat is 0.5Hz, which is the frequency of the sinusoidal envelope of the vibration waveform after frequency misalignment and superposition. The peak amplitude is 31.46μm. The specific value is determined by measuring the vibration amplitude of the mold when adapting it to the actual molding die 1.

[0052] To verify the vibration effect of the present invention on the molding die 1 during assisted molding, a comparison is made between the present invention and existing ultrasonic-assisted vibration devices and methods: like Figure 9 As shown, Figure 9 The simulation diagram shows the vibration effect of a magnetostrictive ultrasonic transducer acting directly on a molding die 1 during three working cycles (a), (b), and (c).

[0053] like Figure 10 As shown, Figure 10 This is a simulation diagram of the vibration effect of the mixed-frequency beat vibration of the present invention on the molding die 1 in three working cycles (a), (b) and (c).

[0054] According to the comparison Figure 9 and Figure 10 It is evident that, with the present invention, the compression molding die 1 has a larger amplitude and a more significant vibration effect.

[0055] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" or "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An ultrasonic-assisted molding device combining alternating vibration and mixed-frequency beat vibration, characterized in that, The mould pressing mould, the ultrasonic vibration device and the driving system, wherein: The ultrasonic vibration device is electrically connected with the driving system; The ultrasonic vibration device comprises a plurality of ultrasonic vibration assemblies arranged uniformly along the circumference of the mould pressing mould, all of which are driven by the driving system to vibrate alternately in turn; The ultrasonic vibration assembly comprises vibration units arranged oppositely on both sides of the mould pressing mould, and the two vibration units corresponding to the same ultrasonic vibration assembly are driven by the driving system to vibrate at different frequencies.

2. The ultrasonic-assisted compression molding apparatus combining alternate vibration and mixing vibration, according to claim 1, wherein The vibration unit is a magnetostrictive ultrasonic transducer.

3. The apparatus according to claim 1, wherein the apparatus is characterized by: When all the ultrasonic vibration assemblies vibrate alternately in turn, the vibrations output by the ultrasonic vibration assemblies are the same in frequency and phase.

4. The apparatus according to claim 3, wherein the apparatus is characterized by: The driving system comprises a signal generation module and a power driving module, wherein: The signal generation module is electrically connected with the power driving module, and the vibration unit is electrically connected with the power driving module; The signal generation module is used to output pulse square wave control signals and frequency offset driving signals, the power driving module drives all the ultrasonic vibration assemblies to vibrate alternately in turn according to the pulse square wave control signals, and the power driving module drives the two vibration units corresponding to the same ultrasonic vibration assembly to vibrate at different frequencies according to the frequency offset driving signals.

5. The apparatus according to claim 4, wherein the apparatus is characterized by: The signal generation module is a DDS digital signal source, which is internally provided with a timer for generating a synchronous trigger signal for controlling the vibration of the ultrasonic vibration assembly.

6. The apparatus for ultrasonic assisted compression molding by combination of alternative vibration and mixing frequency vibration according to claim 4, wherein The power driving module comprises a plurality of power driving units, the number of the power driving units is the same as that of the vibration units, and each power driving unit corresponds to one vibration unit.

7. The apparatus according to claim 1, wherein the apparatus is characterized by: The driving frequencies of the driving system corresponding to the two vibration units of the same ultrasonic vibration assembly are respectively and The vibration amplitudes of the two vibration units acting on the compression molding mold are respectively and , and The superimposed waveform equation is: 。 8. The apparatus for ultrasonic assisted compression molding by combination of alternative vibration and mixing frequency vibration according to claim 1, wherein The number of the ultrasonic vibration assemblies is 3.

9. An ultrasonic assisted compression molding method combining the alternative vibration and the mixing frequency beat vibration, realized based on the device according to any one of claims 1-8, characterized in that, At least the following steps are included: Step one, select the frequency of the peak amplitude of the mold forming mold as the basic resonance frequency ; Step two, driving the ultrasonic vibration assembly by the driving system to vibrate alternately in turn with a working period T0; The two vibration units of the same ultrasonic vibration assembly are driven to be out of frequency by the driving system, one of the two vibration units has a vibration frequency of the basic resonance frequency , and the other vibration frequency .

10. The ultrasonic-assisted compression molding method combining alternate vibration and mixing frequency vibration according to claim 9, wherein The selected frequency at which the peak amplitude of the compression molding die is clear is the basic resonant frequency Comprising: The mode analysis and the harmonic response analysis are performed on the mold forming die by a finite element simulation software, and a frequency with good vibration consistency, uniform stress distribution and large amplitude peak value is selected as the basic resonance frequency .

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