Sheet metal machining stamping device

Abstract

The invention relates to the technical field of sheet metal working, and discloses a sheet metal working stamping device which comprises a stamping machine body, a stamping area of the stamping machine body is provided with a bottom die; the abrasion reduction mechanism is arranged on the surface of the bottom die and comprises a vibration cover body, and piezoelectric ceramic vibration units distributed in an array mode are embedded in the lower wall of the vibration cover body; the micro-mist lubricating system comprises a liquid supply part, the liquid supply part is provided with a cotton thread column, the output end of the cotton thread column is connected with a piezoelectric ceramic vibration unit, the piezoelectric ceramic vibration unit generates a composite vibration mode under the driving of a high-frequency electric signal, ultrasonic frequency vibration of a vibration cover body and directional spraying of lubricating liquid micro-mist are synchronously triggered, and a vibration and atomization collaborative noise reduction structure is formed. Through innovative integration of the piezoelectric ceramic vibration unit and the micro-mist lubrication system, a dual noise reduction and antifriction mechanism is realized, piezoelectric ceramics generate a composite vibration mode under the driving of a high-frequency electric signal, and the contact state of a friction pair between a metal plate and a mold is effectively damaged.

Description

Technical Field

[0001] The present invention relates to the field of sheet metal processing, and more specifically, it relates to a sheet metal processing stamping device. Background Art

[0002] As a core processing equipment in modern manufacturing, the sheet metal processing stamping device undertakes the key task of high-precision forming of metal sheets. By driving the upper die with the stamping machine body to apply a directional pressure to the metal sheet, it causes plastic deformation under the constraint of the bottom die cavity, and precisely realizes composite forming processes such as cutting, bending, and stretching. The main body of the equipment consists of a rigid frame, a hydraulic drive system, a precision guide rail assembly, and an intelligent control system, which can bear a stamping load of up to thousands of tons. With the digital mold design technology, it can efficiently manufacture complex three-dimensional curved parts such as automotive body panels, home appliance shells, and electronic cabinet enclosures.

[0003] During the stamping process, the direct contact between the sheet metal part and the mold will generate a large frictional force, which will not only cause quality problems such as scratches and wear on the surface of the sheet metal part, reducing the appearance and performance of the product, but also accelerate the wear of the mold, shorten the service life of the mold, and increase production costs. For this reason, we propose a sheet metal processing stamping device. Summary of the Invention

[0004] The present invention provides a sheet metal processing stamping device to solve the technical problem that in the related art, the direct contact between the sheet metal part and the mold during the stamping process will generate a large frictional force, which will cause quality problems such as scratches and wear on the surface of the sheet metal part.

[0005] The present invention provides a sheet metal processing stamping device, including: a stamping machine body, and a bottom die is provided in its stamping area;

[0006] A friction reduction mechanism is arranged on the surface of the bottom die and includes:

[0007] A vibration cover body, and piezoelectric ceramic vibration units are embedded in its lower wall and are arranged in an array. The piezoelectric ceramic vibration units are arranged in a directional manner at an inclination angle of 30° towards the edge of the bottom die;

[0008] A micro-mist lubrication system, including a liquid supply part. The liquid supply part is provided with a cotton thread column, and its output end is connected to the piezoelectric ceramic vibration unit. The piezoelectric ceramic vibration unit generates a composite vibration mode under the drive of a high-frequency electrical signal, synchronously triggering the ultrasonic vibration of the vibration cover body and the directional spraying of the lubricating liquid micro-mist, forming a synergistic noise reduction structure of vibration and atomization.

[0009] Furthermore, the vibration cover body is provided with an integrally formed inner lining plate. The inner lining plate extends along the inner circumferential edge of the bottom die in a fully wrapped manner to form an edge protection structure. The working surface of the inner lining plate and the inner wall surface of the bottom die form a zero-step transition, and the flatness tolerance is controlled within 0.01 mm.

[0010] Furthermore, the vibration cover body adopts a three-layer composite structure. The first layer is the spray layer, which is provided with a number of external spray holes I. The second layer is the vibration transmission layer, which consists of a number of honeycomb-shaped vibration transmission holes. The third layer is the adaptation layer, which is provided with an internal installation groove. The depth dimension of the internal installation groove gradually decreases from the outer periphery to the center point of the bottom mold, and the included angle is 30°.

[0011] Furthermore, a number of rows of external spray holes II are provided on the inner lining plate. A row of external spray holes II located at the edge of the inner lining plate and the external spray holes I are both communicated with the vibration transmission holes. The water mist generated by the piezoelectric ceramic vibration unit is sprayed on the lower surface of the sheet metal part through the external spray holes II and the external spray holes I.

[0012] Furthermore, the liquid supply part includes a liquid storage box. The liquid inlet end of the liquid storage box is connected with a replenishing liquid pipe. A liquid injection head is fixedly arranged at the end of the replenishing liquid pipe far away from the liquid storage box, and the liquid injection head is fixed at a corner of the vibration cover body.

[0013] Furthermore, one end of the cotton thread column far away from the piezoelectric ceramic vibration unit penetrates through the upper wall of the liquid storage box, and a number of washing liquid cotton threads are arranged. The liquid storage box is filled with lubricating liquid, and a number of washing liquid cotton threads are immersed in the lubricating liquid.

[0014] Furthermore, a number of fixing ears are fixedly arranged on the outer ring of the piezoelectric ceramic vibration unit. The piezoelectric ceramic vibration unit is assembled with the internal installation groove through a number of fixing ears. The fixing ears are evenly distributed along the circumference, and the radial positioning surface thereof forms a clearance fit of 0.01 mm level with the waveform coupling surface of the internal installation groove.

[0015] Furthermore, the connecting ends of a number of piezoelectric ceramic vibration units are all fixedly connected with branch connecting wires. The other ends of the branch connecting wires are connected with a main control wire. A number of piezoelectric ceramic vibration units are connected in parallel through the branch connecting wires with the main control wire, and are connected with the intelligent system of the stamping machine through the main control wire.

[0016] Furthermore, a number of micro speakers are arranged on one side of the inner lining plate. A sound receiving microphone is arranged between two adjacent micro speakers. The micro speakers and the sound receiving microphones are evenly wrapped by waterproof glue.

[0017] Furthermore, both the micro speakers and the sound receiving microphones are connected with the intelligent system of the stamping machine through wires.

[0018] The beneficial effects of the present invention are as follows:

[0019] Through the innovative integration of the piezoelectric ceramic vibration unit and the micro mist lubrication system, the present invention realizes a dual noise reduction and friction reduction mechanism. The piezoelectric ceramic generates a composite vibration mode under the drive of a high-frequency electrical signal. The 30° directional inclination design enables the vibration energy to be accurately focused on the high wear areas such as the edge of the mold, effectively destroying the contact state of the friction pair between the metal sheet and the mold.

[0020] Functional integration is achieved through a mechatronic structure. The array-type piezoelectric units adopt a modular layout, which not only ensures uniform coverage of the vibration field but also facilitates local replacement and maintenance. The cotton thread column liquid supply system innovatively uses the principle of capillary siphon to achieve precise metering and transportation of the lubricating liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a schematic diagram of the structure of the vibration cover of the present invention;

[0023] Figure 3 is a schematic diagram of the structure of the liquid storage box of the present invention;

[0024] Figure 4 is a schematic diagram of the internal structure of the liquid storage box of the present invention;

[0025] Figure 5 is of the present invention Figure 4 magnified schematic diagram at position A in;

[0026] Figure 6 is a schematic diagram of the internal structure of the vibration cover of the present invention;

[0027] Figure 7 is a schematic diagram of the structure of the sound receiving microphone of the present invention;

[0028] Figure 8 is a schematic diagram of the structure of the piezoelectric ceramic vibration unit of the present invention.

[0029] In the figure: 11, punching machine; 12, bottom die; 2, wear reduction mechanism; 21, vibration cover; 22, lining plate; 23, outer spray hole 1; 24, outer spray hole 2; 25, vibration transmission hole; 26, internal installation groove; 31, liquid storage box; 32, replenishing pipe; 33, liquid injection head; 34, piezoelectric ceramic vibration unit; 35, branch connection wire; 36, cotton thread column; 37, washing cotton thread; 38, fixing ear; 39, main control wire; 4, micro speaker; 5, sound receiving microphone. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein, and the functions and arrangements of the elements discussed can be changed without departing from the scope of protection of the content of this specification. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described for some examples can also be combined in other examples.

[0031] As Figure 1 , Figure 2 , Figure 3And Figure 4 As shown in Figure 4 , a sheet metal processing stamping device includes: a stamping machine body 11, and a bottom die 12 is provided in its stamping area;

[0032] A wear reduction mechanism 2 is arranged on the surface of the bottom die 12 and includes:

[0033] A vibration cover 21, and piezoelectric ceramic vibration units 34 are embedded in its lower wall and are arranged in an array. The piezoelectric ceramic vibration units 34 are arranged in a directional manner at an inclination angle of 30° towards the edge of the bottom die 12;

[0034] A micro-mist lubrication system includes a liquid supply member. The liquid supply member is provided with a cotton thread column 36, and its output end is connected to the piezoelectric ceramic vibration unit 34. The piezoelectric ceramic vibration unit 34 generates a composite vibration mode under the drive of a high-frequency electrical signal, synchronously triggering the ultrasonic vibration of the vibration cover 21 and the directional spraying of the lubricating liquid micro-mist, forming a collaborative noise reduction structure of vibration and atomization.

[0035] The vibration cover 21 is provided with an integrally formed inner lining plate 22. The inner lining plate 22 extends along the inner circumferential edge of the bottom die 12 in a fully wrapped manner to form an edge protection structure. The working surface of the inner lining plate 22 and the inner wall surface of the bottom die 12 form a zero-step transition, and the flatness tolerance is controlled within 0.01 mm.

[0036] The vibration cover 21 adopts a three-layer composite structure. The first layer is a spray layer, which is provided with a plurality of outer spray holes 23. The second layer is a vibration transmission layer, which is composed of a plurality of honeycomb-shaped vibration transmission holes 25. The third layer is an adaptation layer, which is provided with an inner installation groove 26. The depth dimension of the inner installation groove 26 gradually decreases from the outer circumference to the center point of the bottom die 12, and the included angle is 30°.

[0037] A plurality of rows of outer spray holes 24 are opened on the inner lining plate 22. A row of outer spray holes 24 located on the edge of the inner lining plate 22 and the outer spray holes 23 are both communicated with the vibration transmission holes 25. The water mist generated by the piezoelectric ceramic vibration unit 34 is sprayed on the lower surface of the sheet metal part through the outer spray holes 24 and the outer spray holes 23.

[0038] The liquid supply member includes a liquid storage box 31. The liquid inlet end of the liquid storage box 31 is connected with a liquid replenishing pipe 32. A liquid injection head 33 is fixedly arranged at the end of the liquid replenishing pipe 32 far away from the liquid storage box 31, and the liquid injection head 33 is fixed at a corner of the vibration cover 21.

[0039] One end of the cotton thread column 36 far away from the piezoelectric ceramic vibration unit 34 penetrates through the upper wall of the liquid storage box 31, and a plurality of washing cotton filaments 37 are arranged. The liquid storage box 31 is filled with lubricating liquid, and a plurality of washing cotton filaments 37 are immersed in the lubricating liquid.

[0040] A plurality of fixing lugs 38 are fixedly arranged on the outer ring of the piezoelectric ceramic vibration unit 34. The piezoelectric ceramic vibration unit 34 is assembled with the inner mounting groove 26 through the plurality of fixing lugs 38. The fixing lugs 38 evenly distributed along the circumference have a clearance fit of 0.01 mm level between their radial positioning surfaces and the waveform coupling surface of the inner mounting groove 26.

[0041] The connecting ends of several piezoelectric ceramic vibration units 34 are all fixedly connected with branch connecting wires 35. The other ends of the branch connecting wires 35 are connected with a main control wire 39. Several piezoelectric ceramic vibration units 34 are connected in parallel through the branch connecting wires 35 and the main control wire 39, and are connected with the intelligent system of the stamping machine 11 through the main control wire 39.

[0042] On one side of the inner lining plate 22, several micro speakers 4 are arranged. A sound collecting microphone 5 is arranged between two adjacent micro speakers 4. The micro speakers 4 and the sound collecting microphones 5 are evenly wrapped by waterproof glue.

[0043] Both the micro speakers 4 and the sound collecting microphones 5 are connected with the intelligent system of the stamping machine 11 through wires.

[0044] Such as Figure 5 、 Figure 6 、 Figure 7 and Figure 8 as shown, in the stamping preparation stage:

[0045] Place the sheet metal part flat on the vibration cover 21 to ensure its accurate position and prepare for the stamping operation. At this time, the stamping machine body 11 has not been started and each system is in a standby state, ready to run according to the instruction at any time.

[0046] Stamping process:

[0047] The stamping machine body 11 starts, and the stamping block moves downward to perform stamping on the sheet metal part, forcing it to gradually enter the mold cavity of the bottom die 12 and start the plastic deformation process.

[0048] The intelligent system sends a pre-start signal through the main control wire 39, the piezoelectric ceramic vibration unit 34 enters the standby state, and the micro speakers 4 and the sound collecting microphones 5 start to monitor the ambient noise.

[0049] While stamping, the intelligent system of the stamping machine body 11 controls the piezoelectric ceramic vibration unit 34 to work. After receiving the high-frequency electrical signal, the piezoelectric ceramic vibration unit 34 generates a composite vibration mode. On the one hand, it causes the vibration cover 21 to generate ultrasonic vibrations. This high-frequency vibration is transmitted to the sheet metal part, greatly reducing the frictional force between it and the vibration cover 21, reducing the harsh noise generated by the sheet metal part due to rubbing during the forming process, and at the same time helping the sheet metal part to enter the die cavity of the bottom die 12 more smoothly, improving the stamping accuracy. On the other hand, the vibration of the piezoelectric ceramic vibration unit 34 causes the lubricating fluid to form a fine mist. The lubricating fluid in the liquid storage box 31 is transported to the center position of the piezoelectric ceramic vibration unit 34 through the washing cotton thread 37 and the cotton thread column 36. Under the action of the high-frequency vibration of the piezoelectric ceramic vibration unit 34, the lubricating fluid is atomized into tiny particles. These fine mist particles pass through the honeycomb-shaped vibration transmission holes 25. Part of them are ejected from the first external spray hole 23 and evenly adhere to the lower surface of the sheet metal part, achieving a good lubricating effect, reducing the friction coefficient between the sheet metal part and the bottom die 12, reducing wear, and extending the service life of the bottom die 12; the other part is ejected from the second external spray hole 24 at the edge of the inner lining plate 22 and accurately sprayed onto the edge position of the die cavity of the bottom die 12, effectively reducing the friction between the sheet metal part and the edge during stamping and further reducing noise.

[0050] When the stamping block descends, the piezoelectric ceramic vibration unit 34 is started under the control of the intelligent system, vibrating at a high frequency of 20 - 40 kHz with an amplitude of 5 - 10 μm. The vibration energy is amplified through the honeycomb-shaped vibration transmission holes 25, driving the vibration cover 21 to generate ultrasonic micro-amplitude vibrations.

[0051] The friction coefficient of the contact surface between the sheet metal part and the bottom die 12 is reduced by 30% - 50%, reducing the metal scraping noise, and the peak noise reduction is 15 - 20 dB.

[0052] The lubricating fluid in the liquid storage box 31 with a viscosity of 10 - 20 cP is siphoned to the cotton thread column 36 through the washing cotton thread 37, and the capillary action transports the lubricating fluid to the center position of the piezoelectric ceramic vibration unit 34.

[0053] Under the composite vibration mode, longitudinal plus bending vibration, the piezoelectric ceramic vibration unit 34 breaks the lubricating fluid into fine mist particles of 5 - 20 μm, and sprays them directionally through the first external spray hole 23 and the second external spray hole 24. The second external spray hole 24 at the edge directly sprays the edge of the die cavity of the bottom die 12, with the lubricating fluid coverage rate ≥ 95%, the lubricating film thickness of 0.1 - 0.3 μm, and the frictional heat reduced by 40% - 60%.

[0054] The sound pickup microphone 5 with a frequency response range of 50 Hz - 20 kHz collects the stamping noise in real time. The intelligent system analyzes the noise spectrum, focuses on identifying the high-frequency scraping sound of 2 - 8 kHz, and drives the micro speaker 4 to emit reverse sound waves.

[0055] The active noise cancellation system achieves a noise reduction of 10 - 15 dB in the frequency band of 1 kHz - 5 kHz, and the overall workshop noise ≤ 75 dB.

[0056] Noise cancellation mechanism:

[0057] The receiving microphone 5 continuously monitors the noise signal during the stamping process. Once a harsh noise frequency is detected, the signal is immediately transmitted to the intelligent system of the stamping machine body 11. The intelligent system quickly analyzes the noise frequency characteristics and controls the micro speaker 4 to emit a reverse sound wave with the corresponding frequency. Through the principle of sound wave superposition, the reverse sound wave interferes with the harsh noise, achieving the effect of noise cancellation, significantly improving the working environment, and reducing the impact of noise on the operator. The micro speaker 4 and the receiving microphone 5 are encapsulated with waterproof glue and have an IP67 protection to ensure stable operation in a lubricating mist environment, with a response delay < 1 ms.

[0058] Stamping completion and part picking:

[0059] When the stamping process is over, the vibrating cover 21, under the continuous high-frequency vibration of the piezoelectric ceramic vibration unit 34, helps the sheet metal part to loosen, facilitating the operator to quickly and easily remove the formed sheet metal part, improving production efficiency, and reducing part picking time and labor costs.

[0060] After stamping is completed, the piezoelectric ceramic vibration unit 34 switches to a low-frequency large-amplitude mode, 1 - 5 kHz, with an amplitude of 20 - 30 μm. Through the intense vibration of the vibrating cover 21, the formed part is quickly separated from the bottom die 12, the demolding time is shortened by 30%, and the sticking die rate is reduced to less than 0.5%.

[0061] The piezoelectric ceramic vibration unit 34, vibration frequency: 20 - 40 kHz, amplitude: 5 - 30 μm, with a 30° inclination angle for directional arrangement, utilizes the piezoelectric inverse effect to excite high-frequency vibration. The 30° inclination angle optimizes the sound wave reflection path and enhances the vibration energy transfer efficiency.

[0062] The inner lining plate 22, flatness ≤ 0.01 mm, with zero-step transition, eliminates the microscopic gap between the workpiece and the mold, avoids the impact noise at the initial stage of stamping, improves the forming accuracy, and the tolerance is ±0.05 mm.

[0063] The honeycomb-shaped vibration transmission holes 25, with a hexagonal hole side length of 1.5 mm and a wall thickness of 0.2 mm, increase the stiffness of the honeycomb structure by 50%, and the vibration transmission loss ≤ 3%. Ensure the amplitude consistency across the entire vibrating cover 21, with a deviation < 5%. The honeycomb holes 25 in the vibration transmission layer reduce the vibration energy loss from 15% of the traditional structure to 3%, improving the consistency of stamping forming, and CPK ≥ 1.33.

[0064] The vibration direction of the piezoelectric ceramic vibration unit 34 needs to form an optimal energy coupling with the friction surface of the sheet metal part, with a 30° inclination: the included angle between the propagation direction of the vibration wave and the normal direction of the friction surface is 60°, which conforms to the shear stress transfer law during the plastic deformation of the vibration cover 21 material, and can effectively reduce the friction resistance.

[0065] Theoretical verification: According to the vibration energy transfer formula: η = cos²θ·e−αd, where θ is the included angle between the vibration direction and the normal of the contact surface, d is the transfer distance, and α is the material attenuation coefficient. When θ = 60°, cos²60° = 0.25cos²60° = 0.25. Combining with the thickness of the vibration cover 21, the attenuation effect e−αd ≈ 0.9, and the total efficiency η ≈ 22.5%, which is the balance point between the coverage range and the energy density.

[0066] There is usually a fillet transition at the edge of the die cavity of the sheet metal stamping die, with R ≥ 2mm. The 30° inclination can avoid the interference between the piezoelectric ceramic vibration unit 34 and the fillet, and at the same time ensure that the atomized liquid flow clings to the die cavity wall surface.

[0067] The 30° inclined layout can disperse the vibration energy of the piezoelectric ceramic vibration unit 34 and avoid the overall resonance of the vibration cover 21 caused by vertical vibration, 0°.

[0068] When the vibration cover 21 is inclined at 30°, the first-order natural frequency is 850Hz, which is far from the main frequency of the stamping noise, 2 - 8kHz, to avoid resonance amplification of the noise.

[0069] The three-layer composite structure design of the vibration cover 21 endows it with good structural stability and vibration transmission performance. The outer spray holes 23 of the first spray layer ensure the uniform spraying of the lubricating liquid mist; the honeycomb vibration transmission holes 25 of the second vibration transmission layer effectively transmit the vibration generated by the piezoelectric ceramic vibration unit 34, enhancing the uniformity and effectiveness of the vibration; the assembly method of the inner installation groove 26 of the third adaptation layer and the piezoelectric ceramic vibration unit 34 ensures the stable installation and accurate positioning of the vibration unit, improving the overall operation stability of the equipment. In addition, the zero-step transition design between the lining plate 22 and the inner wall surface of the bottom die 12, as well as the strict flatness tolerance control, ensure the accurate forming of the sheet metal part during stamping, improve the dimensional accuracy and quality stability of the product, enhance the adaptability of the device to sheet metal parts of different sizes and shapes, and broaden its application range.

[0070] The high-frequency vibration induced by the piezoelectric ceramic vibration unit 34 reduces the harsh sound generated by the friction of the sheet metal part, and the miniature speaker 4 emits reverse sound waves to cancel the noise. The dual noise reduction mechanism significantly reduces the noise level in the stamping workshop. The measured data shows that the device can reduce the noise during stamping by 10dB - 20dB, greatly improving the working environment of the operators, reducing the damage to the hearing of the operators and the psychological discomfort caused by the noise, and helping to improve work efficiency and job satisfaction.

[0071] The embodiments of the present invention have been described above. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A sheet metal processing punching device, characterized in that: include: A punching machine body (11), wherein a bottom die (12) is provided in a punching area thereof; The wear reduction mechanism (2) is arranged on the surface of the bottom mold (12), and comprises: A vibration cover (21), the lower wall of which is embedded with piezoelectric ceramic vibration units (34) distributed in an array, the piezoelectric ceramic vibration units (34) being arranged in a direction toward the edge of the bottom mold (12) at an inclination angle of 30°; A micro-mist lubrication system comprises a liquid supply component, wherein the liquid supply component is provided with a cotton thread column (36), the output end of which is connected to the piezoelectric ceramic vibration unit (34), and the piezoelectric ceramic vibration unit (34) generates a composite vibration mode under the drive of a high-frequency electrical signal, synchronously triggering the ultrasonic frequency vibration of a vibration cover (21) and the directional injection of lubricating liquid micro-mist, thereby forming a vibration and atomization coordinated noise reduction structure.

2. A sheet metal processing punching device according to claim 1, characterized in that: The vibration cover (21) is provided with an integrally formed inner lining plate (22), the inner lining plate (22) fully wraps and extends along the inner circumferential edge of the bottom mold (12) to form an edge protection structure, the working surface of the inner lining plate (22) and the inner wall surface of the bottom mold (12) form a zero-step transition, and the flatness tolerance is controlled within 0.01 mm.

3. A sheet metal processing punching device according to claim 2, characterized in that: The vibration cover (21) adopts a three-layer composite structure, wherein the first layer is a spray layer having a plurality of external spray holes (23), the second layer is a vibration transmission layer having a plurality of honeycomb-shaped vibration transmission holes (25), and the third layer is an adaptation layer having an internal groove (26). The depth dimension of the internal groove (26) gradually decreases from the outer circumference to the center point of the bottom mold (12), and the angle is 30°.

4. A sheet metal processing punching device according to claim 3, characterized in that: The inner lining plate (22) is provided with a plurality of rows of outer spray holes (24), and a row of outer spray holes (24) and an outer spray hole (23) located at the edge of the inner lining plate (22) are both connected to the vibration transmission hole (25), and the water mist generated by the piezoelectric ceramic vibration unit (34) is sprayed onto the lower surface of the sheet metal part by the outer spray holes (24) and the outer spray holes (23).

5. The sheet metal processing punching device according to claim 1, characterized in that: The liquid supply component comprises a liquid storage box (31), the liquid inlet end of the liquid storage box (31) is connected to a liquid replenishing tube (32), and an end of the liquid replenishing tube (32) away from the liquid storage box (31) is fixedly provided with a liquid injection head (33), and the liquid injection head (33) is fixed to a corner of the vibration cover (21).

6. A sheet metal processing punching device according to claim 5, characterized in that: One end of the cotton thread column (36) away from the piezoelectric ceramic vibration unit (34) passes through the upper wall of the liquid storage box (31), and is provided with a plurality of washing liquid cotton threads (37); the liquid storage box (31) is filled with lubricating liquid, and the plurality of washing liquid cotton threads (37) are immersed in the lubricating liquid.

7. A sheet metal processing punching device according to claim 3, characterized in that: The outer ring of the piezoelectric ceramic vibration unit (34) is fixedly provided with a plurality of fixing ears (38), and the piezoelectric ceramic vibration unit (34) is assembled with the internal groove (26) through the plurality of fixing ears (38), and the fixing ears (38) are evenly distributed along the circumference, and their radial positioning surfaces and the corrugated coupling surfaces of the internal groove (26) are matched with a clearance of 0.01 mm.

8. The sheet metal processing punching device according to claim 1, characterized in that: The connection ends of the plurality of piezoelectric ceramic vibration units (34) are all fixedly connected to branch connection wires (35), the other ends of the branch connection wires (35) are connected to a master control wire (39), the plurality of piezoelectric ceramic vibration units (34) are connected in parallel to the master control wire (39) via the branch connection wires (35), and are connected to an intelligent system of a punching machine (11) via the master control wire (39).

9. A sheet metal processing punching device according to claim 4, characterized in that: A plurality of miniature speakers (4) are arranged on one side of the inner lining plate (22), a sound receiving microphone (5) is arranged between two adjacent miniature speakers (4), and the miniature speakers (4) and the sound receiving microphone (5) are evenly wrapped with waterproof glue.

10. A sheet metal processing punching device according to claim 9, characterized in that: The miniature speaker (4) and the sound receiving microphone (5) are both connected to the intelligent system of the punching machine (11) via wires.

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