Ultrasonic Water Jet Machine

Abstract

To provide an ultrasonic water jet device capable of stably transmitting ultrasonic waves to a water jet and controlling the flow inside the nozzle. [Solution] The ultrasonic water jet device comprises an ultrasonic oscillator 1, a main body 3 to which a converter 2 that transmits ultrasonic waves is fixed, a high-pressure water supply device that supplies a water jet into the main body 3, a nozzle 5 that sprays liquid from the tip of the main body 3, and a water-guiding section 4A having an internal space p1 that expands radially outward on the tip side of the converter 2, the water-guiding section 4A is positioned on the side where the ultrasonic oscillator 1 is located rather than the tapered section 2b2 at the tip of the converter 2, and the fixed section 3a is aligned with the position of the node of the ultrasonic vibration, the water-guiding section 4A comprises one or more annular spacers 10 inside the main body 3 that expand outward from the outer periphery of the cylindrical section 2b1 of the converter 2 and form an internal space p1 on the outer periphery of the internal space p1, and the distance between the nozzle 5 and the target workpiece w1 is selected.

Description

[Technical field]

[0001] The present invention relates to an ultrasonic water jet device. [Background technology]

[0002] Conventionally, water jets have been used for cutting, peeling, deburring, etc. Therefore, it is well known to use a water jet gun or the like for this purpose. However, in the application of water jets, the higher the pressure, the higher the pump costs and maintenance costs become, and therefore the water jet equipment itself and the operation of the water jet device are very costly. Therefore, there is an issue of how to reduce maintenance costs, and there is room for technical improvement.

[0003] In stripping hard coatings, such as those on aircraft, there are limitations to the pressure that can be used, so there is a need to improve stripping performance without increasing the waterjet pressure. Therefore, there is a need for a more efficient device that combines a water jet with ultrasonic waves to increase the impact force compared to conventional water jets.

[0004] For example, patent rights such as Patent Document 1 below can be seen. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4719327 [Patent Document 2] Patent No. 5611359 Summary of the Invention [Problem to be solved by the invention]

[0006] However, Patent Document 1 has the following problems. It is necessary to stabilize the transmission of ultrasonic waves to the water jet. In addition, in order to transmit ultrasonic waves to the water jet more efficiently, it is necessary to control the turbulence of the water jet. The present invention has been devised in consideration of the above-mentioned circumstances, and aims to provide an ultrasonic water jet device that can stably transmit ultrasonic waves to the water jet and control the flow inside the nozzle. [Means for solving the problem]

[0007] The present invention comprises an ultrasonic oscillator that generates ultrasonic waves, a main body that fixes a converter that transmits ultrasonic waves from the ultrasonic oscillator, a high-pressure water supply device that supplies a water jet into the main body, a nozzle that is arranged at the tip of the main body and sprays liquid, and a water-guiding section that has an internal space that expands radially outward on the tip side of the converter, the water-guiding section being arranged on the axial surface of the converter, on the side where the ultrasonic oscillator is located rather than the tapered section at the tip of the converter, and the fixing section of the converter relative to the main body is aligned with the position of the node of the ultrasonic vibration, the water-guiding section is formed inside the main body by expanding outwardly from the outer periphery of a cylindrical section that does not include the tapered section, which is the axial section of the converter, and is provided with one or more annular spacers that form the internal space on the outer periphery of the internal space, and the problem is solved by selecting the distance between the nozzle and the target workpiece. Effect of the Invention

[0008] According to the present invention, it is possible to provide an ultrasonic water jet device that can stably transmit ultrasonic waves to the water jet and control the flow inside the nozzle. [Brief description of the drawings]

[0009] [Figure 1] 1 is a longitudinal sectional view of an ultrasonic water jet apparatus according to an embodiment of the present invention. [Figure 2A]FIG. 2 is a vertical cross-sectional view of a water guide portion of the ultrasonic water jet device of the first embodiment. [Figure 2B] FIG. 2 is a perspective view of a spacer used to form an internal space of the water guiding section of the ultrasonic water jet device of the first embodiment. [Diagram 3] Photographs of top views of machining test results of target workpieces that are the machining targets of Examples 1 to 5. [Figure 4] Photograph of a perspective view of the machining test results of the target workpiece w2 which is the machining target in Examples 1 to 3. [Diagram 5] Photographs of top views of machining test results of target workpieces when SOD is changed from 30 to 110 mm in Example 1. [Figure 6A] FIG. 6 is a vertical cross-sectional view of a water guide portion of the ultrasonic water jet device of the second embodiment. [Figure 6B] FIG. 11 is a perspective view of a first spacer used to form an internal space of the water guiding section of the ultrasonic water jet device of the second embodiment. [Figure 6C] FIG. 11 is a perspective view of a second spacer used to form an internal space of the water guiding section of the ultrasonic water jet device of the second embodiment. [Figure 6D] FIG. 11 is a vertical cross-sectional view of a water guide portion of another ultrasonic water jet device according to the second embodiment. [Figure 7] Photographs of top views of machining test results of target workpieces when SOD is changed from 30 to 120 mm in Example 2. [Figure 8A] FIG. 11 is a vertical cross-sectional view of a water guide portion of the ultrasonic water jet device of the third embodiment. [Figure 8B] FIG. 11 is a perspective view of a first spacer used to form an internal space of the water guiding section of the ultrasonic water jet device of the third embodiment. [Figure 8C] FIG. 11 is a perspective view of a second spacer used to form an internal space of the water guiding section of the ultrasonic water jet device of the third embodiment. [Figure 9A] FIG. 11 is a vertical cross-sectional view of a water guide portion of the ultrasonic water jet device of the fourth embodiment. [Figure 9B] FIG. 13 is a perspective view of a spacer used to form an internal space of the water guide of the ultrasonic water jet device of Example 4. [Figure 10]Photographs of top views of machining test results of target workpieces when the SOD was changed from 30 to 90 mm in the water guide section of the ultrasonic water jet device of Example 4. [Figure 11] FIG. 13 is a vertical cross-sectional view of a water guide portion of the ultrasonic water jet device of the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. <<Embodiment 1>> Fig. 1 shows a vertical cross-sectional view of an ultrasonic water jet device W according to an embodiment of the present invention. The details of the configuration of the water guide section 4 in Fig. 1 will be shown in Figs. 2A, 6A, 6D, 8A, 9A, and 11 described later. The ultrasonic water jet device W of the embodiment is a device that processes a workpiece by using the impact force of a jet water flow.

[0011] The ultrasonic water jet device W comprises an ultrasonic oscillator 1 , a converter 2 , a main body 3 , a water guide section 4 , a nozzle 5 , and a cap 6 . The ultrasonic oscillator 1 generates ultrasonic waves. The converter 2 transmits ultrasonic waves from the ultrasonic oscillator 1 to the liquid water being supplied. The converter 2 has a cylindrical body 2a and a shaft 2b. The shaft 2b has a cylindrical shape with a smaller diameter than the body 2a. The shaft 2b has a cylindrical portion 2b1 and an inclined portion 2b2 in which the diameter of the cylindrical portion 2b1 becomes thinner toward the tip.

[0012] One end of the body 2a of the converter 2 is fixed to the ultrasonic oscillator 1, and the other end of the body 2a is fixed to the cylindrical portion 2b1 of the shaft 2b.

[0013] <Main body 3> The body 3 secures the transducer 2 as part of the ultrasonic waterjet device W. The transducer 2 is secured to the body 3. The main body 3 is provided with a fixing portion 3a for the converter 2, an insertion hole 3b, an enlarged space 3c communicating with the insertion hole 3b, a supply hole 3d through which water is supplied, and a nozzle fixing hole 3e to which a nozzle 5 is fixed.

[0014] A water guide portion 4 is provided downstream of the expanded space 3c in the insertion hole 3b of the main body 3. The body 3 has a fixed portion 3a to which a barrel portion 2a of the converter 2 is fixed. The insertion hole 3b of the main body 3 has an inner diameter larger than the outer diameter of the shaft portion 2b of the converter 2, and the shaft portion 2b of the converter 2 is inserted through it. The space sp1 between the insertion hole 3b of the main body 3 and the shaft portion 2b of the converter 2 is filled with water supplied from a high-pressure water supply device (not shown). The space sp1 serves to transmit ultrasonic waves from the ultrasonic oscillator 1 to the water via the shaft portion 2b of the converter 2.

[0015] The expanded space 3c is provided midway through the insertion hole 3b, and has an inner diameter larger than the inner diameter of the insertion hole 3b. Water used for the water jet is supplied from a high-pressure water supply device (not shown) to the expanded space 3c through the supply hole 3d. Since the expanded space 3c has an inner diameter larger than the inner diameter of the insertion hole 3b, the water from the supply hole 3d is smoothly (without stagnation) supplied to the space sp1 between the shaft 2b of the converter 2 and the insertion hole 3b.

[0016] The water guiding section 4 is provided in the main body 3 in the insertion hole 3b downstream of the expansion space 3c. The water guiding section 4 serves to impart a combination of a sudden expansion effect and an orifice effect to the water used in the water jet. In this way, the water guiding section 4 controls the ultrasonic waves to be stably transmitted to the water being supplied. Details of the water guiding section 4 will be described later.

[0017] <Nozzle 5, Cap 6> The body 3 , nozzle 5 and cap 6 have a central axis O that is centered on the stem 2 b of the transducer 2 . The nozzle 5 has an inclined hole 5a and a nozzle hole 5b. The inclined hole 5a has a diameter that is larger at the end and smaller at the center. The nozzle hole 5b is formed to continue to the end of the inclined hole 5a with the smaller diameter.

[0018] A water jet is ejected from the tip side of the nozzle hole 5b toward the workpiece to be machined. The downstream end of the insertion hole 3b of the main body 3 is continuous with the end of the inclined hole 5a of the nozzle 5, the end having a larger diameter. The cap 6 is a cylindrical member having a stepped inner diameter, and has a large diameter portion 6a, a medium diameter portion 6b, a small diameter portion 6c, and a tapered diameter portion 6d.

[0019] The inner diameter of the large diameter portion 6a, the inner diameter of the medium diameter portion 6b, the inner diameter of the small diameter portion 6c, and the inner diameter of the inclined diameter portion 6d have the following relationship: inner diameter of inclined diameter portion 6d<inner diameter of small diameter portion 6c<inner diameter of medium diameter portion 6b<inner diameter of large diameter portion 6a. The large diameter portion 6a of the cap 6 is fixed to the main body 3. The tip of the nozzle 5 is fixed to one end side of the inclined diameter portion 6d continuing to the nozzle hole 5b, and the other end side of the inclined diameter portion 6d forms the tip of the cap 6. The inner diameter s4 of the inclined diameter portion 6d of the cap 6 gradually increases from one end on the inner side to the other end on the outer side.

[0020] One end side of the small diameter of the inner diameter s4 of the inclined diameter portion 6d is larger than the diameter of the nozzle hole 5b of the nozzle 5. This is configured so that the gradually increasing inner diameter s4 of the inclined diameter portion 6d does not interfere with the water jet ejected from the nozzle hole 5b toward the workpiece to be machined. The cap 6 fixes the nozzle 5 and receives the internal pressure caused by the water jet transmitted from the nozzle 5 .

[0021] <Converter 2> The transducer 2 transmits ultrasonic waves from the ultrasonic generator 1 . The optimal material for the transducer 2 is aluminum, titanium, etc., depending on the sound transmission and compatibility with surrounding materials. When predicting the performance of materials based on the speed of sound, the order is aluminum > titanium > SUS304 (stainless steel) > SUS630 (stainless steel) > titanium alloy. In this embodiment, SUS630 is used, taking into consideration the shape and strength of the transducer 2.

[0022] The water used in the water jet is sealed at the point where the converter 2 and the main body 3 are connected. Here, if the space sp1 is large, the load on the converter 2 due to the internal pressure of the water jet increases, so it is better to narrow the space sp1. Therefore, in the ultrasonic water jet device W, the outer diameter of the shaft 2b of the converter 2 is adjusted to be as small as possible.

[0023] Moreover, it is preferable that the converter 2 is fixed to the main body 3 in a manner that does not suppress (repress / hinder) the vibration of the ultrasonic waves from the ultrasonic oscillator 1.

[0024] In particular, the nodes of ultrasonic vibration are important because their amplitude is zero. Fixing the nodes of ultrasonic vibration can suppress the effect on the ultrasonic vibration. By aligning the fixed portion 3a of the converter 2 with the body 3 at the position of the node of the ultrasonic vibration, the amplitude of the ultrasonic vibration at the fixed portion 3a becomes zero. Therefore, it is possible to suppress / not inhibit the ultrasonic vibration from the ultrasonic oscillator 1 as much as possible.

[0025] Therefore, it is desirable to align the location where the transducer 2 is fixed to the main body 3 with the node position of the ultrasonic vibration. Here, at the location where the converter 2 is fixed to the main body 3, it is important that the converter 2 is fixed and sealed.

[0026] <Water conveyance section 4> Conventional ultrasonic water jet devices (Patent Documents 1 and 2, etc.) transmit ultrasonic waves, but have the problem that the water jet is not stable, resulting in a discontinuous application shape, and work efficiency is poor. If the ultrasonic waves are not properly transmitted to the water jet, the desired machining effect cannot be obtained. In other words, there are times when the ultrasonic waves are properly transmitted to the water jet, increasing the chipping capacity (machining capacity), and times when the ultrasonic waves are not properly transmitted to the water jet, not increasing the chipping capacity (machining capacity). This can result in unstable operation and reduced work efficiency.

[0027] In addition, in the past, although the jet was stable, the ultrasonic waves were not properly transmitted to the water jet, and the work could not be performed. In other words, the work could be performed, but the benefits of adding ultrasonic waves to the water jet were not obtained, and the processing capacity did not increase. Therefore, the optimal effect of adding ultrasonic waves to the water jet could not be obtained. Conventionally, there has been a problem in which it was not possible to achieve both a stable water jet flow and the normal transmission of ultrasonic waves to the water jet.

[0028] To address this issue, the water conducting section 4 (see FIG. 1) of the present embodiment generates stable disturbances in the internal space p of the water conducting section 4, thereby stably transmitting ultrasonic waves to the water jet. This makes it possible to reduce variation in the results of water jet application. The water guide portion 4 is configured to have an internal space p through which the water to be the water jet flows by sandwiching a spacer 10. The specific configuration and processing results will be described in the following examples.

[0029] <Ultrasound generated by ultrasonic oscillator 1> The ultrasonic oscillator 1 uses ultrasonic waves with a frequency of 40 kHz. The nodes of the ultrasonic waves change depending on the frequency and wavelength of the ultrasonic waves. Therefore, the size of the nozzle 5, the optimum value of the arrangement position of each element, SOD (stand of distance (distance to the target object)), etc. change.

[0030] <Example 1> Fig. 2A shows a vertical cross-sectional view of the water guiding section 4A of the ultrasonic water jet device W of Example 1. Fig. 2B shows a perspective view of a spacer 10 used to form an internal space p1 of the water guiding section 4A of the ultrasonic water jet device W of Example 1. The internal space p1 of the water guide portion 4A in the first embodiment is a space having an inner diameter of Φ16 mm and a width of 4 mm.

[0031] The spacer 10 shown in FIG. 2B is an annular member having a thickness t1 of 2 mm and an inner diameter d1 of Φ16 mm. The internal space p1 (FIG. 2A) in Example 1 is formed by using two annular spacers 10, with an inner diameter of Φ16 mm and a width of 4 mm. The size of the internal space p1 can be adjusted by using a single or multiple spacers 10. In the following examples including Example 1, machining tests using the ultrasonic water jet device W were carried out under the following test conditions.

[0032] Oscillation frequency of ultrasonic oscillator 1: 40kHz Water pressure: 70MPa Water flow rate: 30L / min Nozzle diameter of nozzle hole 5b of nozzle 5: φ1.35 mm Nozzle 5 movement speed: 12 mm / s Number of passes for nozzle 5: 1 (If the number of passes for nozzle 5 is not specified, the number of passes is assumed to be 1)

[0033] Fig. 3 shows a photograph of a top view of the machining test results of the target workpiece w1 that is the machining target in Examples 1 to 5. The target workpiece w1 in the tests of Examples 1 to 5 shown in Fig. 3 is an aluminum alloy A5052. The SOD (stand of distance (distance from the target workpiece w1)) of the machining shape k11 of the target workpiece w1 shown in FIG. 3 in the first embodiment is 100 mm.

[0034] Fig. 4 shows a photograph of a perspective view of the machining test result of the target workpiece w2 which is the machining target of Examples 1 to 3. The target workpiece w2 of the tests of Examples 1 to 3 shown in Fig. 4 is SS400, a general structural rolled steel material.

[0035] The test conditions for Figure 4 are: SOD is 100mm In machining the target workpiece w2 shown in FIG. 4 in the first embodiment, the machining shape k12 has a chipping depth of 0.443 mm when machined with 40 passes, and the machining shape k13 has a chipping depth of 1.021 mm when machined with 92 passes. At SOD: 100 mm, machining is favorable in the internal space p1 with an inner diameter of Φ16 mm and a width of 4 mm.

[0036] FIG. 5 shows a photograph of a top view of the machining test results of the target workpiece w1 when the SOD was changed from 30 to 110 mm in Example 1. Table 1 shows the conditions and results of the processed shapes j11 to j14.

[0037] [Table 1] From the results of the machining shapes j11 to j16 in Fig. 5, the results were good except for the machining shape j11 with SOD = 30 mm.

[0038] <Example 2> Fig. 6A shows a vertical cross-sectional view of the water guiding section 4B of the ultrasonic water jet device W of Example 2. Fig. 6B and Fig. 6C show perspective views of the first spacer 10a1 and the second spacer 10a2 used to form the internal space p2 of the water guiding section 4B of the ultrasonic water jet device W of Example 2, respectively. The internal space p2 (see FIG. 6A) of the water guide portion 4B in the second embodiment is a space having an inner diameter of Φ16 mm and a width of 3 mm.

[0039] The first spacer 10a1 shown in FIG. 6B is an annular member having a thickness t21 of 1 mm and an inner diameter d21 of Φ16 mm. The second spacer 10a2 shown in FIG. 6C is an annular member having a thickness t22 of 2 mm and an inner diameter d22 of Φ16 mm. The internal space p2 of the water guide section 4 in Example 2 was formed by using an annular first spacer 10a1 and a second spacer 10a2, and had an inner diameter of Φ16 mm and a width of 4 mm.

[0040] The SOD (stand of distance (distance from the target workpiece w1)) of the machining shape k21 of the target workpiece w1 shown in FIG. 3 of the second embodiment is 100 mm. In machining the target workpiece w2 shown in FIG. 4 in the second embodiment, the machining shape k22 has a chipping depth of 0.336 mm when machined with 40 passes, and the machining shape k23 has a chipping depth of 0.744 mm when machined with 92 passes.

[0041] FIG. 6D shows a vertical cross-sectional view of a water guiding portion 4B1 of an ultrasonic water jet device W according to another example of the second embodiment. The internal space p21 of the water conducting section 4B1 of the second embodiment is a space having an inner diameter of Φ16 mm and a width of 3 mm. The internal space p21 of the water conducting section 4B1 is disposed at a distance of 1 mm from the internal space p2 of the water conducting section 4B of Fig. 6A toward the inclined section 2b2 of the converter 2. The internal space p21 is disposed at the boundary between the cylindrical section 2b1 of the converter 2 and the inclined section 2b2.

[0042] FIG. 7 shows a photograph of a top view of the machining test results of the target workpiece w1 when the SOD was changed from 30 to 120 mm in Example 2. The processed shapes j21 to j26 are the results of water jet processing of the water guiding portion 4B in FIG. 6A. Table 2 shows the conditions and results of the machining shapes j21 to j29.

[0043] [Table 2]

[0044] The processed shapes j27 to j29 are the results of water jet processing of the water guiding portion 4B1 of another example in FIG. 6D.

[0045] From the results in FIG. 7, the water jet processing of the water guiding portion 4B in FIG. 6A gave better results than the water jet processing of the water guiding portion 4B1 in FIG. 6D.

[0046] <Example 3> Fig. 8A shows a vertical cross-sectional view of the water guiding section 4C of the ultrasonic water jet device W of Example 3. Fig. 8B and Fig. 8C show perspective views of the first spacer 10b1 and the second spacer 10b2 used to form the internal space p3 of the water guiding section 4C of the ultrasonic water jet device W of Example 3, respectively. The internal space p3 of the water-conducting portion 4C of the third embodiment is composed of two spaces each having an internal diameter of Φ16 mm and a width of 1 mm, sandwiching a space having an internal diameter of Φ22 mm and a width of 2 mm therebetween.

[0047] The first spacer 10b1 shown in FIG. 8B is an annular member having a thickness t31 of 1 mm and an inner diameter d31 of Φ16 mm. The second spacer 10b2 shown in FIG. 8C is an annular member having a thickness t32 of 1 mm and an inner diameter d32 of Φ22 mm. The internal space p3 of the water guide section 4 in the third embodiment is a space formed by using two annular second spacers 10b2 and a pair of first spacers 10b1 sandwiching the two second spacers 10b2 therebetween.

[0048] The SOD (stand of distance (distance from the target workpiece w1)) of the machining shape k31 of the target workpiece w1 shown in FIG. 3 of the third embodiment is 100 mm. In the machining of the target workpiece w2 shown in Fig. 4 in Example 3, the SOD is 100 mm. When the machining shape k32 is 40 passes, the chipping depth is 0.290 mm, and when the machining shape k33 is 92 passes, the chipping depth is 0.741 mm. In the internal space p3 of Example 3, good processing results were obtained.

[0049] <Example 4> Fig. 9A shows a vertical cross-sectional view of a water guiding section 4D of the ultrasonic water jet device W of Example 4. Fig. 9B shows a perspective view of a spacer 10c used to form an internal space p4 of the water guiding section 4D of the ultrasonic water jet device W of Example 4. The internal space p4 of the water guide portion 4D of the fourth embodiment is a space having an inner diameter of Φ22 mm and a width of 2 mm.

[0050] A spacer 10c shown in FIG. 9B is an annular member having a thickness t4 of 1 mm and an inner diameter d4 of Φ22 mm. The internal space p4 of the water guide section 4 in the fourth embodiment was formed by using two annular spacers 10c. The SOD of the machining shape k41 of the target workpiece w1 shown in FIG. 3 in the fourth embodiment is 100 mm.

[0051] FIG. 10 shows a photograph of a top view of a machining test result of a target workpiece w1 when the SOD was changed from 30 to 90 mm in the water guide portion 4D of the ultrasonic water jet device W of Example 4. Table 3 shows the conditions for the processed shapes j41 to j46. [Table 3]

[0052] From the results in FIG. 10, the machining shape j42 with SOD=60 mm had the best workability. The machining shape j41 with SOD=30 mm had the worst workability. The other machining shapes j43 to j46 had almost good workability.

[0053] <Example 5> FIG. 11 shows a vertical cross-sectional view of a water guide section 4E of an ultrasonic water jet device W according to a fifth embodiment. The internal space p5 of the water guide portion 4E of the fifth embodiment is a space having an inner diameter of Φ16 mm and a width of 1 mm. The internal space p5 is formed in the main body 3, and is disposed at the boundary between the cylindrical portion 2b1 of the converter 2 and the inclined portion 2b2.

[0054] The machining results using the water guide portion 4E of Example 5 are the machined shapes j51, j52, and j53 shown in FIG. Table 4 shows the conditions and results of the machining shapes j51 to j53. [Table 4]

[0055] The processed shapes j51 to j53 in FIG. 3 showed superior processability to the conventional method. From the fifth embodiment, it is preferable to dispose the internal space p5 closer to the cylindrical portion 2b1 than to the boundary between the cylindrical portion 2b1 and the inclined portion 2b2. From the results of Examples 1 to 5, it was confirmed that by providing a space with a width of 1 to 5 mm and an inner diameter of φ16, φ22 upstream of the inclined portion 2b2 of the converter 2 in the ultrasonic water jet device W, effective processing can be performed based on the amount of chipping of the workpieces w1 and w2.

[0056] Therefore, it is believed to function effectively in a space with a width of about 1 to 6 mm and an inner diameter of about φ14 to φ24. Furthermore, by using the spacers (10, 10a1, 10a2, 10b1, 10b2, 10c), the sizes of the internal spaces p1 to p4 can be easily adjusted. In the ultrasonic water jet device W of the embodiment, the tip (inclined portion 2b2) of the shaft portion 2b of the converter 2 is short, so that the structure is such that vibration is unlikely to occur in the first place.

[0057] In the ultrasonic water jet device W, a water jet is supplied into the inside of the main body 3, and then rapidly expands toward the internal space p (p1 to p5) of the water-guiding section 4. Then, through the orifice effect, the water is ejected from the nozzle 5 to the inclined section 2b2 at the tip of the converter 2. It is believed that the effect is due to the repeated sudden expansion and orifice inside the water jet flow path of the main body 3. As described above, the ultrasonic water jet device W generates stable disturbances in the internal space p (p1 to p5) of the water conducting section 4, thereby stably transmitting ultrasonic waves to the water jet, thereby reducing variation in the results of the water jet application.

[0058] Moreover, the flow inside the nozzle 5 can be controlled by combining the sudden expansion effect into the internal space p (p1 to p5) of the water guide section 4 with the orifice effect.

[0059] <<Other embodiments>> 1. The embodiment shows one example, and various forms are possible within the scope of the utility model claim. [Explanation of symbols]

[0060] 1 Ultrasonic oscillator 2 Converter 2a Body (other end) 2b Shaft part 2b1 Cylindrical part (other end) 2b2 Inclined section (tapered section) 3. Main unit 3a Fixed part 4. Water conveyance section 5 Nozzles 6 Cap 10,10c Spacer 10a1, 10b1 First spacer (spacer) 10a2, 10b2 Second spacer (spacer) p internal space W Ultrasonic water jet device w1 Target work

Claims

1. an ultrasonic oscillator for generating ultrasonic waves; a main body for fixing a transducer for transmitting ultrasonic waves of the ultrasonic oscillator; A high-pressure water supply device that supplies a water jet into the main body; A nozzle disposed at a tip of the main body and configured to eject liquid; a water guide portion having an internal space expanded radially outward on the tip side of the converter; the water guide portion is disposed on the axial surface of the converter, closer to the ultrasonic oscillator than the tapered portion at the tip of the converter; A fixing portion of the transducer relative to the main body is aligned with a node position of the ultrasonic vibration, The water guide portion is A cylindrical portion, which is a shaft portion of the converter, is formed inside the main body and extends outward from the outer periphery of the cylindrical portion, not including the tapered portion. A single or multiple annular spacers are provided on the outer periphery of the internal space to form the internal space, and the distance between the nozzle and the target workpiece is selected.

1. An ultrasonic water jet device comprising:

2. A cap is provided to fix the tip of the body and the nozzle.

2. The ultrasonic water jet device according to claim 1 .

3. The internal space has a width of 1 to 6 mm in the axial direction of the transducer.

2. The ultrasonic water jet device according to claim 1 .

4. The inner space has an inner diameter of φ14 to φ24 in the radial direction of the shaft portion of the converter.

2. The ultrasonic water jet device according to claim 1 .

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