Cavitation treatment nozzle and cavitation treatment method

Abstract

To improve the efficiency of cavitation treatment by CASF.SOLUTION: The nozzle 100 for cavitation treatment is dipped in a treatment liquid 203 in which an abrasive 204 is clouded and jets a jet flow C1 of the treatment liquid 203 accompanied by cavitation, and includes an injection part 10 having an injection port 12 for injecting the jet flow C1 along an injection axis 13, a liquid guide part body 20 arranged in the injection part 10 and covering the injection port 12, a liquid chamber 30 arranged in the liquid guide part body 20 and facing the injection port 12, a jet flow outlet 40 extending from the liquid chamber 30 to the outside of the liquid guide part body 20 along the injection axis 13, and a liquid guide path 50 extending from the liquid chamber 30 to the outside of the liquid guide part body 20 in a direction different from the injection axis 13.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a nozzle for treating cavitation. [Background technology]

[0002] A cavitation surface treatment method called cavitation abrasive surface finishing (CASF) is known, which uses a cavitation jet containing an abrasive to smooth the surface roughness of an object and perform peening (US2024 / 0001509A1). Summary of the Invention [Problem to be solved by the invention]

[0003] In CASF, the amount of abrasive supplied to the object affects the efficiency of the cavitation treatment. The present invention aims to improve the efficiency of cavitation treatment by CASF. [Means for solving the problem]

[0004] A first aspect of the present invention is A cavitation treatment nozzle in which an abrasive is immersed in a turbid treatment liquid and which ejects a jet of the treatment liquid accompanied by cavitation, an injection unit having an injection port that injects the jet along an injection axis; a liquid guide body disposed in the spray unit and covering the nozzle; a liquid chamber disposed in the liquid guide body and facing the nozzle; a jet outlet extending along the jet axis and penetrating from the liquid chamber to the outside of the liquid guide body; a liquid guide path extending in a direction different from the ejection axis and penetrating from the liquid chamber to the outside of the liquid guide body, This is a nozzle for treating cavitation.

[0005] A low pressure portion is formed in the liquid chamber by the ejection of the jet, and the treatment liquid flows into the liquid chamber from the outside of the liquid guide body through the liquid guide passage and flows out together with the jet from the jet outlet.

[0006] The nozzle diameter of the injection part is, for example, 0.5 mm to 3 mm, and the injection pressure of the jet is, for example, 10 MPa to 200 MPa.

[0007] The liquid guide body may be, for example, cylindrical or prismatic. In this case, the jet axis may coincide with the central axis of the liquid guide body. The jet outlet may be formed at the center of the bottom surface of the liquid guide body. The liquid guide channel may open to a side surface of the liquid guide body. A plurality of liquid guide channels may be arranged at equal intervals around the jet axis.

[0008] The liquid guide body may be detachable from the spray part. A plurality of liquid guide bodies with different shapes may be prepared and the liquid guide body may be replaced as needed depending on various conditions such as the material and shape of the target object.

[0009] The abrasive is abrasive particles, such as ceramics, alumina, garnet, or zirconia.

[0010] The object is made of metal. Examples of metals constituting the object include heat-resistant alloys, aluminum alloys, magnesium alloys, titanium, titanium alloys, steel, and corrosion-resistant steel. Examples of the object are machine parts, medical equipment parts, and medical instruments. Examples of machine parts include piping, valves, piping joints, and aerospace parts. Examples of medical instruments include surgical implants. Examples of aerospace parts include aircraft engine parts and other aircraft parts, rocket engine parts, spacecraft parts, satellite parts, and rocket piping.

[0011] The object and the cavitation treatment nozzle are both immersed in a treatment liquid stored in a tank. In the treatment liquid, a jet of the treatment liquid is sprayed from the cavitation treatment nozzle toward the object. The treatment liquid is, for example, water. The treatment liquid may contain a rust inhibitor.

[0012] The cavitation treatment is performed on a part or the entire surface of the object. [Effects of the Invention]

[0013] According to the present invention, the efficiency of cavitation treatment by CASF can be improved. [Brief explanation of the drawings]

[0014] [Figure 1] A side view of the cavitation treatment nozzle of this embodiment. [Figure 2] FIG. 1 is a longitudinal cross-sectional view of a nozzle for treating cavitation according to an embodiment of the present invention; [Figure 3] Cross section of line III-III in Figure 2 [Figure 4] Cross section of line IV-IV in Figure 2 [Figure 5] Cavitation treatment device equipped with the cavitation treatment nozzle of this embodiment DETAILED DESCRIPTION OF THE INVENTION

[0015] 1 to 4, the cavitation treatment nozzle 100 of this embodiment has an ejection section 10, a liquid guide section main body 20, a liquid chamber 30, a jet outlet 40, a liquid guide path 50, and a fixing section 60. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 3. The cavitation treatment nozzle 100 ejects a jet C1 toward the left in FIGS. 1 and 2. In the cavitation treatment nozzle 100, the downstream side of the jet C1 is the tip side (the left side in FIGS. 1 and 2), and the upstream side is the base side (the right side in FIGS. 1 and 2).

[0016] The injection unit 10 has a shaft 11 and an orifice 12. The shaft 11 is cylindrical in shape. The shaft 11 extends along a central axis 101. The orifice 12 is provided at the tip of the shaft 11. The orifice 12 injects a jet C1 along an injection axis 13. The injection axis 13 coincides with the central axis 101. A high-pressure fluid supply source (not shown), which will be described later, is connected to the base end of the shaft 11.

[0017] The liquid guide portion body 20 has a cylindrical shape. The liquid guide portion body 20 extends along a central axis 101. The liquid guide portion body 20 has a liquid guide portion distal end surface 21, a liquid guide portion proximal end surface 22, a liquid guide portion side surface 23, and an insertion hole 24. The liquid guide portion distal end surface 21 and the liquid guide portion proximal end surface 22 are circular. The liquid guide portion body 20 is separate from the spray portion 10. The insertion hole 24 extends from the center of the liquid guide portion proximal end surface 22 along the central axis 101 toward the distal end and into the liquid guide portion body 20. The insertion hole 24 has a circular cross section. The shaft 11 is inserted into the insertion hole 24. As a result, the liquid guide portion body 20 is positioned in the spray portion 10 and covers the nozzle 12. The spray portion 10 is inserted into the insertion hole 24 from the deepest part to the proximal end side. That is, a space is formed between the tip of the ejection part 10 and the tip of the insertion hole 24 .

[0018] The liquid chamber 30 is disposed inside the liquid guide portion main body 20. The liquid chamber 30 is a cylindrical space. The liquid chamber 30 has a liquid chamber tip surface 31 and a liquid chamber side surface 32. The base end side of the liquid chamber 30 is closed by the spray portion 10. Therefore, the nozzle 12 faces the base end side of the liquid chamber 30. The liquid chamber 30 is part of the insertion hole 24, and is the portion between the tip of the spray portion 10 and the tip of the insertion hole 24.

[0019] The jet outlet 40 is a hole that penetrates from the liquid chamber 30 to the outside of the liquid guide body 20. The jet outlet 40 extends along the injection axis 13. The jet outlet 40 opens at the center of the liquid chamber tip surface 31 and the center of the liquid guide tip surface 21. The jet outlet 40 has a circular cross section. The central axis of the jet outlet 40 coincides with the injection axis 13. The diameter of the jet outlet 40 is smaller than the diameter of the liquid chamber 30.

[0020] The liquid guide channel 50 is a hole that penetrates from the liquid chamber 30 to the outside of the liquid guide body 20. The liquid guide channel 50 extends in a direction different from the injection axis 13. The liquid guide channel 50 has a liquid guide axis 51, which is a straight line that intersects with the injection axis 13. The liquid guide channel 50 extends along the liquid guide axis 51. When viewed from the direction of the central axis 101, the liquid guide axis 51 extends in the radial direction of the liquid guide body 20. The liquid guide channel 50 opens to the liquid chamber side surface 32 and the liquid guide side surface 23. The liquid guide channel 50 extends toward the tip as it approaches the liquid chamber 30. The angle α between the injection axis 13 and the liquid guide axis 51 is, for example, 20 degrees. The liquid guide channel 50 has a circular cross section. The central axis of the liquid guide channel 50 coincides with the liquid guide axis 51. The diameter of the liquid guide channel 50 is smaller than the diameter of the liquid chamber 30. 3, six liquid guideways 50 are provided. The liquid guideways 50 are arranged around the injection axis 13 at equal intervals. The liquid-guiding axis 51 may be a curve.

[0021] As shown in Fig. 4, the fixing part 60 has a split groove 61 and a fastening bolt 62. The split groove 61 is formed in the liquid guide part base end surface 22 along the diameter direction. The fastening bolt 62 is inserted from the liquid guide part side surface 23 so as to intersect with the split groove 61. By tightening the fastening bolt 62 with the jet part 10 inserted into the insertion hole 24, the spacing of the split groove 61 becomes narrower, and the liquid guide part main body 20 is fixed to the jet part 10.

[0022] A cavitation treatment apparatus 200 equipped with the cavitation treatment nozzle 100 will now be described. As shown in Fig. 5, the cavitation treatment apparatus 200 includes a tank 201, the cavitation treatment nozzle 100, a fixing base 202, and a high-pressure fluid supply source (not shown).

[0023] The tank 201 stores a processing liquid 203. The processing liquid 203 is, for example, water. The processing liquid 203 is a turbid liquid containing an abrasive 204. The tank 201 may include a device for circulating the stored processing liquid 203.

[0024] The cavitation treatment nozzle 100 is connected to a high-pressure fluid supply source. The nozzle 12 faces vertically downward. The cavitation treatment nozzle 100 can move in three axial directions: horizontally (front-back and left-right) and up-down. The ejection speed (pressure) of the jet C1 and the movement of the cavitation treatment nozzle 100 in the three axial directions are controlled by a control device (not shown).

[0025] The fixed table 202 fixes the workpiece (object) 300. The workpiece 300 is fixed to the fixed table 202 with fasteners (not shown) such as bolts and clamps. The fixed table 202 can move in the vertical direction. The workpiece 300 is put in and taken out of the tank 201 by the vertical movement of the fixed table 202. The vertical movement of the fixed table 202 is controlled by a control device (not shown).

[0026] The cavitation treatment nozzle 100 and the workpiece 300 fixed to the fixing table 202 are immersed in the treatment liquid 203 in which the abrasive 204 is mixed. The high-pressure fluid supply source is activated, and a jet C1 is sprayed from the nozzle 12 of the cavitation treatment nozzle 100 along the spray axis 13. The spray direction of the jet C1 is vertically downward. The jet C1 is a straight rod-shaped jet. The jet C1 contains many cavities. This cavitation treatment device 200 can spray the jet C1 at any location on the workpiece 300 from any distance.

[0027] The high-pressure processing liquid 203 is ejected at high speed as a jet C1 from the nozzle 12, thereby forming a low-pressure portion in the liquid chamber 30. The pressure in the low-pressure portion is lower than the pressure of the processing liquid 203 around the cavitation processing nozzle 100. Therefore, the processing liquid 203 flows from the outside of the liquid-guiding portion main body 20 through the liquid-guiding path 50 into the liquid chamber 30 as an introduction flow C2. Then, the introduction flow C2 flows out from the jet outlet 40 together with the jet C1.

[0028] The jet C1 entrains the abrasive 204 and collides with the surface of the workpiece 300. The abrasive 204 contained in the jet C1 removes unnecessary portions of the workpiece 300. After the unnecessary portions are removed, the abrasive 204 contained in the jet C1 smooths the surface of the workpiece 300. Adding the introduction flow C2 to the jet C1 entrains more abrasive 204, improving the efficiency of the cavitation treatment by CASF. The impact force generated when cavities contained in the jet C1 collapse causes peening of the surface of the workpiece 300. The peening imparts compressive residual stress to the surface of the workpiece 300. The cavitation treatment nozzle 100 may be moved along the shape of the workpiece 300 while spraying the jet C1.

[0029] The liquid guide body 20 is detachable from the spray unit 10. A plurality of different types of liquid guide body 20 with different shapes may be prepared and replaced as needed. Differences in the shape of the liquid guide body 20 include, for example, the diameter, number, and angle of the liquid guide passages 50 relative to the spray axis 13 of the liquid guide body 20. For example, differences in the shape of the liquid guide body 20 include the shape and size of the liquid chamber 30. For example, differences in the diameter of the jet outlet 40 of the liquid guide body 20 result in different behavior of the introduced flow C2. By selecting an appropriate liquid guide body 20 depending on various conditions, such as the material and shape of the workpiece 300, appropriate cavitation processing can be performed.

[0030] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention, and all technical matters included in the technical ideas described in the claims are subject to the present invention. The above-described embodiments are preferred examples, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the appended claims. [Explanation of symbols]

[0031] 10 Injection part 12 spout 13 Injection axis 20 Liquid guide body 30 Liquid chamber 40 Jet outlet 50 Liquid guide path 100 Cavitation treatment nozzle 203 Processing liquid 204 Abrasives C1 Jet

Claims

1. A cavitation treatment nozzle in which an abrasive is immersed in a turbid treatment liquid and which ejects a jet of the treatment liquid accompanied by cavitation, an injection unit having an injection port that injects the jet along an injection axis; a liquid guide body disposed in the spray unit and covering the nozzle; a liquid chamber disposed in the liquid guide body and facing the nozzle; a jet outlet extending along the jet axis and penetrating from the liquid chamber to the outside of the liquid guide body; a liquid guide path extending in a direction different from the ejection axis and penetrating from the liquid chamber to the outside of the liquid guide body, Nozzle for cavitation treatment.

2. The liquid guideway has a liquid guide axis that is a straight line intersecting the injection axis. The nozzle for cavitation treatment according to claim 1.

3. the liquid guide path is directed toward the downstream side of the jet as it moves toward the liquid chamber; The nozzle for cavitation treatment according to claim 1 or 2.

4. A plurality of the liquid guide channels are provided. The nozzle for cavitation treatment according to any one of claims 1 to 3.

5. the liquid guide body is separate from the jetting part; The nozzle for cavitation treatment according to any one of claims 1 to 4.

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