Cavitation surface treatment nozzle and cavitation surface treatment device

Abstract

A nozzle for cavitation surface treatment is provided that can impart strong compressive stress to the surface of an object and promote grinding of the surface of the object. [Solution] A nozzle 10 for cavitation surface treatment has a nozzle tip 13 which has a first plane 13a from which liquid is sprayed and which is perpendicular to an injection axis 1, a second plane 13b which is perpendicular to the injection axis 1 and is the opposite surface of the first plane 13a, and a nozzle hole 21 which is arranged on the first plane 13a and has a semicylindrical discharge groove 23 extending in a first direction perpendicular to the injection axis 1, an injection hole 25 which extends along the injection axis 1 and is connected to the discharge groove 23 and is a right elliptical cylinder having an elliptical cross section whose major axis extends in the first direction, and an introduction portion 27 which has a right conical surface 27a with the injection axis 1 as its central axis and is connected to the injection hole 25.

Description

[Technical field]

[0001] The present invention relates to a cavitation surface treatment nozzle and a cavitation surface treatment device. [Background technology]

[0002] A nozzle having a plate, a hollow body, and a cap assembled to the hollow body and holding the plate to the hollow body is known (US2024 / 0001549A1, hereinafter referred to as Patent Document 1). Summary of the Invention [Problem to be solved by the invention]

[0003] According to Patent Document 1, there were cases where high compressive stress was not applied, and cases where the amount of surface grinding was small. An object of the present invention is to provide a cavitation surface treatment nozzle and a cavitation surface treatment device that can impart strong compressive stress to the surface of an object and promote grinding of the object surface. [Means for solving the problem]

[0004] The first aspect of the present invention is A nozzle tip comprising: A first plane from which the liquid is ejected and perpendicular to the ejection axis; A second plane perpendicular to the injection axis and opposite to the first plane; A nozzle hole, a semi-cylindrical discharge groove disposed on the first plane and extending in a first direction perpendicular to the ejection axis; an ejection hole extending along the ejection axis and connected to the ejection groove, the ejection hole having a right elliptical cylindrical shape with an elliptical cross section whose major axis extends in the first direction; an introduction portion having a right circular cone surface with the injection axis as a central axis and connected to the injection hole; A nozzle hole having A nozzle for cavitation surface treatment having a nozzle tip having a

[0005] A second aspect of the present invention is a processing tank for storing a processing liquid; A table disposed in the treatment tank and on which a workpiece is placed; The cavitation surface treatment nozzle; a nozzle pipe to which the cavitation surface treatment nozzle can be attached, the nozzle pipe being movable in a front-back direction, a top-down direction, and a left-right direction with respect to the table; This is a cavitation surface treatment.

[0006] The nozzle tip is, for example, a gemstone, an artificial gemstone, or a sintered body based on an artificial gemstone. The nozzle tip is an industrial grade polycrystalline or monocrystalline material such as sintered diamond, or an additively manufactured mixture of natural or synthetic or crystalline materials with a Mohs hardness of 8 or more. The nozzle tip is, for example, a corundum, diamond, or artificial diamond sintered body. Two planes being substantially identical means that one plane is contained within a range of 0.5 mm from the other plane. The nozzle tip and the support may be integrally formed. For example, the nozzle tip and the support may be made of the same material. Corrosion resistant alloys are, for example, stainless steels, nickel steels, and nickel aluminides. The injection angle is preferably 5 degrees to 15 degrees, and more preferably 7 degrees to 10 degrees.

[0007] The treatment liquid stored in the storage tank is composed of, for example, a rust inhibitor and water. The treatment liquid stored in the storage tank may have an abrasive suspended therein. Effect of the Invention

[0008] According to the present invention, a strong compressive stress can be applied to the surface of the object, and grinding of the surface of the object can be promoted. [Brief description of the drawings]

[0009] [Figure 1]FIG. 1 is a perspective view of a nozzle for cavitation surface treatment according to an embodiment of the present invention; [Diagram 2] FIG. 1 is a perspective view of a nozzle for cavitation surface treatment according to an embodiment of the present invention; [Diagram 3] View of arrow III in Figure 1 [Figure 4] Cross-sectional view of line IV-IV in Figure 3 [Diagram 5] Cross-sectional view of line VV in Figure 3 [Figure 6] Cavitation surface treatment device of this embodiment [Figure 7] Enlarged view of the cavitation treatment device of this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 1 to 5, a nozzle (cavitation surface treatment nozzle) 10 of this embodiment has a nozzle body 11. The nozzle body 11 has a nozzle tip 13 and a support stand 15. The nozzle 10 has an ejection axis 1. For convenience, a first direction is defined as X, a direction in which the ejection axis 1 extends is defined as Z, and a direction perpendicular to XY is defined as Y.

[0011] The nozzle tip 13 is a right cylinder centered on the ejection axis 1. The nozzle tip 13 is a sintered diamond body. The nozzle tip 13 has a first flat surface 13a, a second flat surface 13b, a cylindrical surface 13c, and a nozzle hole 21. The first flat surface 13a and the second flat surface 13b are perpendicular to the ejection axis 1.

[0012] The nozzle hole 21 is disposed about the injection axis 1. The nozzle hole 21 has a discharge groove 23, an injection hole 25, and an introduction portion 27. The ejection groove 23 is disposed on a first plane. The ejection groove 23 extends in the X direction. The cross section of the ejection groove 23 parallel to the YZ plane has a semicircular shape. The ejection hole 25 extends along the ejection axis 1. The ejection hole 25 has a right elliptical cylindrical shape. As shown in Fig. 3, the cross section of the ejection hole 25 in the XY plane has an elliptical shape. The center of the cross section is located on the ejection axis 1. The major axis of the cross section extends in the X direction. The introduction portion 27 has a right circular cone shape. The introduction portion 27 is a body of revolution about the injection axis 1. The introduction portion 27 has a right circular cone surface 27a. The right circular cone surface 27a has a smaller diameter toward the first plane 13a. The right circular cone surface 27a is directly connected to the elliptical cylindrical surface of the injection hole 25.

[0013] The support base 15 has a nozzle tip chamber 15a, a second bottom surface 15b, a first bottom surface 15c, and a jet flow passage hole 15d. The support base 15 has a right circular cylindrical shape centered on the injection axis 1. The support base 15 is made of, for example, stainless steel. The first bottom surface 15c is substantially flush with the second flat surface 13b of the nozzle tip 13. The distance between the first bottom surface 15c and the second flat surface 13b is, for example, 0.5 mm or less. The nozzle tip chamber 15a is a right circular cylinder centered on the ejection axis 1 and extends from the first bottom surface 15c. The nozzle tip 13 abuts against the nozzle tip chamber 15a at both the first flat surface 13a and the cylindrical surface 13c. The nozzle tip 13 is fixed to the nozzle tip chamber 15a. The jet passing hole 15d is a right circular cylinder centered on the ejection axis 1. The jet passing hole 15d may be a stepped hole. The jet passing hole 15d is connected to the nozzle tip chamber 15a. The jet passing hole 15d may be a right elliptical cylinder or a right circular cone. The cross section of the conical jet passing hole increases with increasing distance from the nozzle tip 13.

[0014] As shown in FIG. 6, the cavitation surface treatment device 50 includes a treatment tank 51 , a nozzle pipe 57 , a packing 58 , a cap 59 , the nozzle 10 , a table 53 , a high-pressure pump 56 , and a moving device 55 .

[0015] A processing liquid is stored in the processing tank 51. A table 53 is placed in the processing tank 51. The workpiece 3 is placed on the table 53. In the processing liquid in the processing tank 51, an abrasive may be suspended.

[0016] The nozzle 10 is disposed in the nozzle pipe 57. The nozzle pipe 57 has a nozzle chamber 57a, a male thread 57b, a fluid passage 57c, and a packing groove 57d. The nozzle chamber 57a is a right cylinder and opens at the tip of the nozzle pipe 57. The nozzle chamber 57a is connected to the fluid passage 57c. The nozzle 10 is disposed in the nozzle chamber 57a. The nozzle chamber 57a, the male thread 57b, the fluid passage 57c, and the packing groove 57d are disposed coaxially with the injection axis 1. The packing groove 57d is disposed on the bottom surface of the nozzle chamber 57a. The nozzle 10 abuts against the nozzle chamber 57a. The packing 58 is, for example, an O-ring. The packing 58 is disposed in the packing groove 57d and seals between the nozzle pipe 57 and the nozzle 10. The cap 59 has a female thread 59a and a jet passage 59b. The jet passage 59b is connected to the jet passing hole 15d.

[0017] The high pressure pump 56 is, for example, a plunger pump. The high pressure pump 56 is connected to the fluid passage 57c. The moving device 55 is connected to the nozzle pipe 57. The moving device 55 can move the nozzle pipe 57 in the left-right, up-down, and front-back directions.

[0018] As shown in FIG. 7, according to the nozzle 10 of this embodiment, the treatment water supplied from the high-pressure pump 56 flows from the introduction portion 27 into the ejection hole 25, whereby the treatment water is rectified and accelerated. Since the first bottom surface 15c and the second plane 13b are substantially the same, the treatment liquid smoothly flows into the introduction portion 27. The treatment liquid is ejected from the elliptical cylindrical ejection hole 25 through the ejection groove 23. The rectified treatment water is ejected strongly from the ejection hole 25, and spreads in a flat shape on the XZ plane by the ejection groove 23. Since the ejection hole 25 is elliptical cylindrical, the ejected treatment liquid is easily diffused in the X direction. The ejection angle is preferably 5 degrees to 15 degrees. More preferably, the ejection angle is 7 degrees to 10 degrees. As a result, the treatment liquid stored in the treatment tank 51 is vigorously diffused on the XZ plane, promoting the generation of cavities. Then, the treatment liquid containing many cavities collides with the workpiece 3. This promotes the application of compressive stress to the surface of the workpiece 3 .

[0019] The nozzle hole 21 and the second plane 13b on which the inlet of the nozzle hole 21 is arranged are made of sintered diamond, which can reduce the amount of wear when the processing liquid flows at high speed. The cap 59 is detachable from the nozzle pipe 57. Therefore, the cap 59 can be easily replaced when worn out. The nozzle tip 13 has a high hardness, so the nozzle tip 13 is resistant to wear. In addition, the support base 15 is made of corrosion-resistant steel or high-tensile steel, so it has excellent durability.

[0020] When abrasive particles are mixed in the treatment tank 51, the surface of the workpiece 3 is ground by the abrasive particles. Since the flow velocity of the treatment water ejected from the nozzle 10 is high, the abrasive particles are accelerated and collide with the surface of the workpiece 3. This promotes grinding of the surface of the workpiece 3. When the abrasive particles are turbid, wear of the nozzle 10 is accelerated. However, the nozzle hole 21 and the first plane 13a on which the outlet of the nozzle hole 21 is arranged are made of diamond sintered bodies. Therefore, wear of the nozzle hole 21 and the first plane 13a is suppressed.

[0021] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention, and all technical matters included in the technical ideas described in the claims are the subject of the present invention. The above-described embodiment shows a preferred example, 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 attached claims. [Explanation of symbols]

[0022] 1 Injection axis 10. Cavitation surface treatment nozzle 11 Nozzle body 13 Nozzle Tip 13a 1st plane 13b 2nd plane 15 Support stand 21 Nozzle hole 23 Discharge groove 25 Spout hole 27 Introduction

Claims

1. A nozzle tip comprising: a first plane from which the liquid is ejected and perpendicular to the ejection axis; A second plane perpendicular to the injection axis and opposite to the first plane; A nozzle hole, a semi-cylindrical discharge groove disposed on the first plane and extending in a first direction perpendicular to the ejection axis; an ejection hole extending along the ejection axis and connected to the ejection groove, the ejection hole having a right elliptical cylindrical shape with an elliptical cross section whose major axis extends in the first direction; an introduction portion having a right circular cone surface with the injection axis as a central axis and a diameter decreasing toward the first plane, the introduction portion being connected to the injection hole; A nozzle hole having A nozzle for cavitation surface treatment having a nozzle tip having a

2. The nozzle tip is columnar, the first plane and the second plane being both end surfaces. The cavitation surface treatment nozzle according to claim 1.

3. A right cylindrical support base, a first bottom surface that is substantially coplanar with the second bottom surface; a nozzle tip chamber disposed on the first bottom surface, in which the nozzle tip is disposed and which comes into contact with the nozzle tip; a second bottom surface opposite the first bottom surface; a jet passage hole extending from the second bottom surface along the ejection axis and connected to the nozzle tip chamber; The support base further comprises: The cavitation surface treatment nozzle according to claim 1 or 2.

4. The nozzle tip has a Mohs hardness of 9 or more. The cavitation surface treatment nozzle according to claim 1 or 2.

5. The support base is a corrosion-resistant alloy or high-tensile steel; The cavitation surface treatment nozzle according to claim 3.

6. The support base is separate from the nozzle tip. The cavitation surface treatment nozzle according to claim 3.

7. the support base is integral with the nozzle tip; The cavitation surface treatment nozzle according to claim 3.

8. a processing tank for storing a processing liquid; A table disposed in the treatment tank and on which a workpiece is placed; The cavitation surface treatment nozzle according to claim 1 or 2; a nozzle pipe to which the cavitation surface treatment nozzle can be attached, the nozzle pipe being movable in a front-back direction, a top-down direction, and a left-right direction with respect to the table; A cavitation surface treatment device comprising:

9. the nozzle pipe has a nozzle chamber into which the cavitation surface treatment nozzle is inserted and into which the cavitation surface treatment nozzle abuts, The method further includes a nozzle cap disposed at a tip of the nozzle pipe and fastening the cavitation surface treatment nozzle to the nozzle pipe. The cavitation surface treatment device according to claim 8.

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