High-precision ultrasonic vibration amplitude detection device and method

Abstract

The invention relates to a high-precision ultrasonic vibration amplitude detection device and method, and belongs to the field of ultrasonic amplitude detection. The device comprises a strain detection mechanism and a signal processing mechanism, the strain detection mechanism comprises three annular strain gauges, and the signal processing mechanism comprises a signal filter and a signal converter; the strain detection mechanism is sleeved on the amplitude-change pole, the ultrasonic power supply is turned on, and the amplitude-change pole begins to vibrate; the strain detection mechanism is shifted, and the signal filter screens and processes the electric signal transmitted by the strain detection mechanism to obtain an electric signal corresponding to the maximum amplitude in a half-wavelength; the processed electric signal is transmitted to a signal converter, and the electric signal is converted into an amplitude value, namely an amplitude a within a half-wavelength is obtained; the strain detection mechanism continues to be shifted, the amplitude b in the next half-wavelength is obtained, if the two are the same, the amplitude of the tool is a, and if the two are different, the amplitude of the tool can be solved according to the length of the amplitude-change pole and the length of the half-wavelength. According to the method, the problem of tool amplitude detection in the existing ultrasonic-assisted cutting field is solved, meanwhile, amplitude detection of the tool under the no-load condition and the load condition can be achieved, the specific detection method is provided, the overall process is simple, and operation is convenient.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic-assisted cutting, and more particularly to a high-precision ultrasonic vibration amplitude detection device and method. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Ultrasonic-assisted cutting technology is a technique that uses an ultrasonic power supply, transducer, and amplitude transformer to apply ultrasonic excitation to the cutting tool, thereby achieving ultrasonic vibration of the tool. It is widely used in the high-quality machining of difficult-to-machine materials such as stainless steel and titanium alloys, as well as in the field of micro-textured machining of material surfaces. It can effectively reduce cutting force and cutting temperature, reduce tool wear, improve the quality of machined surfaces, and achieve high-quality machining of micro-textured surfaces.

[0004] Ultrasonic amplitude is an important parameter in ultrasonic-assisted cutting, which directly affects the surface quality and microtexture morphology. Currently, the detection of ultrasonic amplitude is mainly carried out by laser vibrometer. During the detection, the laser emitter needs to be constantly aligned with the tool, which makes the detection difficult and makes it impossible to detect the ultrasonic amplitude in the machining process in real time. At the same time, the detection instrument is complex to design and expensive, which has become an urgent problem to be solved in the field of ultrasonic-assisted cutting. Summary of the Invention

[0005] To address the technical problems existing in the prior art, the present invention provides a high-precision ultrasonic vibration amplitude detection device and method.

[0006] This invention provides a high-precision ultrasonic vibration amplitude detection device, including a strain detection mechanism and a signal processing mechanism; The strain detection mechanism includes three strain gauges for detecting the strain generated by the amplitude transformer under resonance conditions; The signal processing mechanism includes a signal filter and a signal converter, used to solve for the maximum amplitude of the amplitude rod within one and a half wavelengths.

[0007] Furthermore, the strain gauge is a ring strain gauge, and the spacing between the three strain gauges remains constant.

[0008] Furthermore, the signal filter is connected to the strain gauge.

[0009] Furthermore, the signal converter is connected to the signal filter.

[0010] Furthermore, the amplitude within the first half-wavelength is a The amplitude within the second half-wavelength is b Amplitude transfer coefficient k=b / a .

[0011] Furthermore, the annular strain gauge is fitted onto the amplitude transformer.

[0012] A high-precision ultrasonic vibration amplitude detection method includes the following steps: Step 1: Place the three strain gauges onto the amplitude transformer. Step 2: Turn on the ultrasonic power supply; the amplitude transformer will begin to vibrate. Step 3: Move the three strain gauges. When the electrical signals collected by the two outer strain gauges are the same, that is, the strain is the same, the strain collected by the middle strain gauge is the amplitude. Step 4: The signal filter filters the electrical signals of the three strain gauges. When the electrical signals of two strain gauges are consistent, the electrical signal of the other strain gauge is output to the signal converter. Step 5: The signal converter converts the received electrical signal to obtain the amplitude within one half-wavelength. a ; Step 6: Continue to oscillate the strain gauge until the situation described in Step 3 occurs, thus obtaining the amplitude of the next half-wavelength. b If the two are the same, then the amplitude of the tool is a ; Step 7, if a≠b Seeking k=b / a The length of the amplitude transformer is L One half wavelength is l Magnification n=L / l Then the tool amplitude is nk .

[0013] The beneficial effects of this invention are as follows: This invention provides a high-precision ultrasonic vibration amplitude detection method. A strain gauge is placed on an amplitude transformer to detect the strain generated during the vibration of the amplitude transformer. The electrical signal generated by the strain gauge is filtered and converted by a signal processing mechanism to obtain the amplitude of the tool in ultrasonic-assisted cutting. This detection method can detect the amplitude of the tool more quickly and accurately, especially the amplitude of the tool in the machining state. It is easy to operate, highly practical, and suitable for promotion in the field of ultrasonic-assisted cutting. Attached Figure Description

[0014] Figure 1 The present invention provides a high-precision ultrasonic vibration tool amplitude detection method. Figure 2 This is a schematic diagram showing the connection relationship of each mechanism in the high-precision ultrasonic vibration amplitude detection device provided in the embodiment of the present invention; Figure 3 A structural diagram of the annular strain gauge in the high-precision ultrasonic vibration amplitude detection device provided in this embodiment of the invention; Figure 4 This refers to the amplitude transmission process corresponding to the amplitude transformer that does not have an amplitude amplification function in the high-precision ultrasonic vibration tool amplitude detection method provided in this embodiment of the invention; Figure 5 This refers to the amplitude transmission process corresponding to the amplitude amplification rod in the high-precision ultrasonic vibration tool amplitude detection method provided in this embodiment of the invention.

[0015] In the figure: 1. Strain detection mechanism, 2. Transducer, 3. Ultrasonic power supply, 4. Signal filter, 5. Signal converter, 6. Amplitude bar, 101. Strain gauge. Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figures 2-3 As shown, an embodiment of the present invention discloses a high-precision ultrasonic vibration amplitude detection device, including a ring strain gauge and a signal processing device; The strain detection mechanism 1 includes three strain gauges for detecting the strain generated by the amplitude transformer 6 in the resonance state. When the ultrasonic power supply 3 is turned on, the amplitude transformer 6 begins to vibrate, which moves the strain detection mechanism 1 and transmits the transformed electrical signal to the signal processing mechanism. The signal processing mechanism includes a signal filter 4 and a signal converter 5, used to solve for the maximum amplitude of the amplitude rod within one and a half wavelengths.

[0018] like Figure 3 As shown, the strain gauge is a ring strain gauge, and the spacing between the three strain gauges remains constant.

[0019] The signal filter is connected to the strain gauge.

[0020] The signal converter is connected to the signal filter.

[0021] The annular strain gauge is fitted onto the amplitude transformer.

[0022] In the fluctuation strain detection mechanism 1, when two of the electrical signals generated by the three strain gauges 101 are consistent, the amplitude corresponding to the other electrical signal at this time is the maximum amplitude within a half wavelength. The electrical signal is processed by the signal filter 4, and the electrical signal corresponding to the maximum amplitude is transmitted to the signal converter 5. The signal converter 5 converts the electrical signal into an amplitude value.

[0023] like Figures 4-5 The diagram shows the amplitude transmission states of two types of amplitude transformers. When the amplitude transmission state is as follows... Figure 4 As shown, the amplitude within one half-wavelength is obtained through the above steps. a ,but a That is, the amplitude of the tool; when the amplitude transmission state is as follows: Figure 5 As shown, the amplitude within the first half-wavelength is obtained as follows. a The amplitude within the second half-wavelength is b Then the amplitude transfer coefficient k=b / a The length of the amplitude transformer is L One half wavelength is l Magnification n=L / l Then the tool amplitude is nk .

[0024] like Figure 1 The present invention also discloses a high-precision ultrasonic vibration amplitude detection method, comprising the following steps: Step 1: Place the three annular strain gauges onto the amplitude transformer. Step 2: Turn on the ultrasonic power supply; the amplitude transformer will begin to vibrate. Step 3: Move the three strain gauges. When the electrical signals collected by the two outer strain gauges are the same, that is, the strain is the same, the strain collected by the middle strain gauge is the amplitude. Step 4: The signal filter filters the electrical signals of the three strain gauges. When the electrical signals of two strain gauges are consistent, the electrical signal of the other strain gauge is output to the signal converter. Step 5: The signal converter converts the received electrical signal to obtain the amplitude within one half-wavelength. a ; Step 6: Continue to oscillate the strain gauge until the situation described in Step 3 occurs, thus obtaining the amplitude of the next half-wavelength. b If the two are the same, then the amplitude of the tool is a ; Step 7, if a≠b Seeking k=b / a The length of the amplitude transformer is L One half wavelength is l Magnification n=L / l Then the tool amplitude is nk .

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0026] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A high-precision ultrasonic vibration amplitude detection device, characterized in that, Includes strain detection mechanism and signal processing mechanism; The strain detection mechanism includes three strain gauges for detecting the strain generated by the amplitude transformer under resonance conditions; The signal processing mechanism includes a signal filter and a signal converter, used to solve for the maximum amplitude of the amplitude rod within one and a half wavelengths.

2. The high-precision ultrasonic vibration amplitude detection device as described in claim 1, characterized in that, The strain gauge is a ring strain gauge, and the spacing between the three strain gauges remains constant.

3. The high-precision ultrasonic vibration amplitude detection device as described in claim 1, characterized in that, The signal filter is connected to the strain gauge.

4. The high-precision ultrasonic vibration amplitude detection device as described in claim 1, characterized in that, The signal converter is connected to the signal filter.

5. The high-precision ultrasonic vibration amplitude detection device as described in claim 1, characterized in that, The amplitude within the first half-wavelength is a The amplitude within the second half-wavelength is b Amplitude transfer coefficient k=b / a .

6. The high-precision ultrasonic vibration amplitude detection device as described in claim 2, characterized in that, The annular strain gauge is fitted onto the amplitude transformer.

7. A high-precision ultrasonic vibration amplitude detection method, characterized in that, Includes the following steps: Step 1: Place the three strain gauges onto the amplitude transformer. Step 2: Turn on the ultrasonic power supply; the amplitude transformer will begin to vibrate. Step 3: Move the three strain gauges. When the electrical signals collected by the two outer strain gauges are the same, that is, the strain is the same, the strain collected by the middle strain gauge is the amplitude. Step 4: The signal filter filters the electrical signals of the three strain gauges. When the electrical signals of two strain gauges are consistent, the electrical signal of the other strain gauge is output to the signal converter. Step 5: The signal converter converts the received electrical signal to obtain the amplitude within one half-wavelength. a ; Step 6: Continue to oscillate the strain gauge until the situation described in Step 3 occurs, thus obtaining the amplitude of the next half-wavelength. b If the two are the same, then the amplitude of the tool is a ; Step 7, if a≠b Seeking k=b / a The length of the amplitude transformer is L One half wavelength is l Magnification n=L / l Then the tool amplitude is nk .

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