Cavitation treatment method

Abstract

An object (10) including an object hole (20) having a curved portion (210) curved from an inlet (23) to an outlet (24) is manufactured by additive manufacturing, the object (10) and a nozzle (102) having a spout (103) are immersed in a treatment liquid (105) in which an abrasive material (106) is turbid, and a straight line from the outside to the inside of the object hole (20) is used as a spray axis (30). The straight line has a portion closer to an inner surface (211) on the outlet (24) side than the inlet (23) of the target hole (20), the inner surface (211) being a surface on the inner peripheral side of the curved portion (210) in the side surface (25) of the target hole (20), and a jet (C1) of the processing liquid (105) with cavitation bubbles is jetted from the nozzle (103) along the jet axis (30). The inside of the target hole (20) is cavitated by the jet (C1).

Description

TECHNICAL FIELD

[0001] The present application relates to a cavitation processing method of performing cavitation processing on an object. BACKGROUND

[0002] A cavitation surface processing method called cavitation abrasive surface finishing (CASF: Cavitation Abrasive Surface Finishing) of smoothing a surface of an object and performing shot blasting using a cavitation jet containing an abrasive material is known (US2024 / 0001509A1). SUMMARY

[0003] According to the existing cavitation processing method, there is a case where the inside of a curved object hole cannot be ground.

[0004] An object of the present application is to effectively grind the inside of an object hole curved from an inlet to an outlet.

[0005] A first aspect of the present application is a cavitation processing method in which,

[0006] An object is produced by additive manufacturing, the object containing an object hole having a curved portion curved from an inlet to an outlet,

[0007] The object and a nozzle having a nozzle opening are immersed in a processing liquid turbid with an abrasive material,

[0008] A straight line from the outside toward the inside of the object hole is taken as a jet axis, the straight line having a portion closer to an inner side surface on the outlet side than the inlet of the object hole, the inner side surface being a surface of the curved portion on the inner peripheral side among the side surfaces of the object hole, a jet of the processing liquid with cavitation bubbles is jetted from the nozzle opening along the jet axis,

[0009] The inside of the object hole is subjected to cavitation processing with the jet.

[0010] The object is composed of a metal. The metal composing the object is, for example, a heat-resistant alloy, an aluminum alloy, a magnesium alloy, titanium, a titanium alloy, a steel, a corrosion-resistant steel. The object is, for example, a mechanical component, a medical device component, a medical appliance. The mechanical component is, for example, a pipe, a valve, a pipe joint, an aerospace component. The medical appliance includes a surgical implant. The aerospace component includes an aircraft engine component and other aircraft components, a rocket engine component, a spacecraft component, a satellite component, a rocket pipe.

[0011] The object hole can be a through hole. The object hole can also extend linearly from an inlet, having a curved portion on the inner side thereof. The object hole can also be composed only of a curved portion.

[0012] The nozzle has a nozzle diameter of, for example, 0.5 mm to 3 mm. The jet has a jet pressure of, for example, 10 MPa to 200 MPa.

[0013] The object and the nozzle are immersed in the treatment liquid stored in the tank. In the treatment liquid, the jet of the treatment liquid is jetted from the nozzle toward the object. The treatment liquid is, for example, water. The treatment liquid can also contain a rust preventive.

[0014] The jet axis can also intersect the inner side surface of the curved portion. The jet axis can intersect the outer side surface that is the side surface of the outer periphery side of the curved portion. The jet axis can have a portion that passes through the vicinity of the inner side surface compared to the outer side surface of the curved portion. The jet axis can extend along the inner side surface on the outlet side compared to the end portion of the inlet side of the curved portion. The jet axis can extend along the inner side surface at the end portion of the outlet side of the curved portion.

[0015] A portion or the entire surface of the side surface of the object hole is subjected to cavitation treatment.

[0016] The abrasive material is an abrasive particle. The abrasive material is, for example, ceramic, alumina, garnet, zirconia.

[0017] The structure of the support structure material is, for example, block support, adaptive cell support, rod support, wire support, tree support.

[0018] The side surface of the object hole being supported can also be smoothed while the support structure material is removed by the jet.

[0019] According to the present application, the inside of the object hole curved from the inlet to the outlet can be effectively ground. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a cross-sectional view of the object of the first embodiment.

[0021] Figure 2 is a plan view of the object of the first embodiment.

[0022] Figure 3 is an explanatory view of the additive manufacturing of the object of the first embodiment.

[0023] Figure 4 is a cavitation treatment device of the first embodiment.

[0024] Figure 5 is a cross-sectional view of the object of the second embodiment.

[0025] SYMBOL EXPLANATION

[0026] 10, 10a object

[0027] 20, 20a object hole

[0028] 25, 25a side surface

[0029] 30, 30a injection axis

[0030] 102 nozzle

[0031] 103 spout

[0032] 105 processing liquid

[0033] 106 abrasive material

[0034] 210, 210a curved portion

[0035] 211, 211a inner side surface

[0036] C1 jet DETAILED DESCRIPTION

[0037] <First Embodiment>

[0038] In the cavitation processing method of the first embodiment, first, the object 10 is modeled by additive manufacturing (also called additive fabrication). Next, the object 10 and the nozzle 102 are immersed in the processing liquid 105 in which the abrasive material 106 is turbid. Then, the support structure material 26 is removed by cavitation processing.

[0039] Based on Figure 1 and Figure 2 The object 10 in the present embodiment is described. Figure 1 is Figure 2 a cross-sectional view taken along line I-I of FIG. 1. In addition, in Figure 1 and Figure 2 , the X direction and the Y direction are horizontal directions. The Z direction is a vertical direction. The description is based on the posture of the object 10 at the time of cavitation processing.

[0040] The object 10 has an upper surface 21, a lower surface 22, and one object hole 20. The upper surface 21 faces upward. The lower surface 22 faces downward. The upper surface 21 and the lower surface 22 can be parallel. The object hole 20 has an inlet 23, an outlet 24, and a side surface 25. The object hole 20 penetrates from the upper surface 21 to the lower surface 22. The inlet 23 is formed on the upper surface 21. The outlet 24 is formed on the lower surface 22. The outlet 24 is located inside with respect to the inlet 23. The side surface 25 extends from the inlet 23 to the outlet 24. As Figure 2 indicated, the object hole 20 extends longer in the X direction as viewed from the upper side.

[0041] As Figure 1As shown, the object hole 20 has a bend 210. The object hole 20 does not have a supporting structural material. The bend 210 bends from the inlet 23 to the outlet 24. The entire object hole 20 is the bend 210. The bend 210 bends to the extent that the outlet 24 can be visually identified from the inlet 23. The bend 210 has an inner surface 211 and an outer surface 212. The inner surface 211 is the inner peripheral side of the bend 210. Figure 1 (The right side). The outer surface 212 is the outer peripheral side of the curved portion 210. Figure 1 (Left side). For example Figure 1 As shown, on a plane orthogonal to the X direction, the tangent T at the end of the outlet 24 side of the inner surface 211 extends in the vertical direction.

[0042] In the object hole 20, the injection axis 30 is defined as follows. However, the injection axis 30 is defined on a section of the object hole 20 orthogonal to the X direction. For example... Figure 1 As shown, the injection axis 30 is a straight line extending from the outside of the object hole 20 through the inlet 23 toward the inside. The injection axis 30 has a portion closer to the inner surface 211 on the outlet 24 side compared to the inlet 23 side of the object hole 20. At least at the end on the outlet 24 side of the object hole 20, the injection axis 30 passes near the inner surface 211 compared to the outer surface 212. The injection axis 30 extends along the inner surface 211 at its end on the outlet 24 side of the object hole 20. The injection axis 30 extends downward in the vertical direction.

[0043] First, the object 10 is shaped using additive manufacturing. For example... Figure 3 As shown, materials are layered from bottom to top on the base surface 300, so that the lower surface 22 is in contact with the base surface 300. During shaping, the upward-facing surface of the side surface 25 of the object hole 20 is called the upper surface 250, and the downward-facing surface is called the lower surface 260. The upper surface 250 is composed of the inner side surface 211. The lower surface 260 is composed of the outer side surface 212. The angle of inclination α of the lower surface 260 relative to the horizontal direction is smallest at the end of the inlet 23. The angle of inclination α is 45 degrees or more. During shaping, a supporting structural material 26 can also be shaped inside the object hole 20. The supporting structural material 26 is a long, thin rod extending vertically. The supporting structural material 26 extends from the base surface 300 or the upper surface 250 to the lower surface 260.

[0044] Next, the cavitation treatment apparatus used for cavitation treatment will be described. For example... Figure 4 As shown, the cavitation treatment device 100 includes a tank 101, a nozzle 102, a fixed platform 104, and a high-pressure fluid supply source (not shown).

[0045] Tank 101 stores processing liquid 105. Processing liquid 105 is, for example, water. Processing liquid 105 is a liquid that has become turbid with abrasive material 106. Tank 101 may also have a device for circulating the stored processing liquid 105.

[0046] Nozzle 102 is connected to a high-pressure fluid supply source. Nozzle 102 has an orifice 103. The orifice 103 faces downward in the vertical direction. Nozzle 102 sprays a jet C1 of treatment fluid 105 from the orifice 103 downward in the vertical direction. Jet C1 is a straight, rod-shaped jet. Jet C1 contains numerous cavitation bubbles. Nozzle 102 is movable in three axes: horizontal (front-back and left-right) and vertical. The spray velocity (pressure) of jet C1 and the movement of nozzle 102 in the three axes are controlled by a control device (not shown).

[0047] The fixed platform 104 secures the object 10. The object 10 is fixed to the fixed platform 104 by fasteners (not shown) such as bolts and clamps. The fixed platform 104 is movable in the vertical direction. The object 10 moves in and out of the slot 101 relative to the fixed platform 104 by the vertical movement of the fixed platform 104. The vertical movement of the fixed platform 104 is controlled by a control device (not shown).

[0048] The cavitation treatment device 100 is capable of spraying a jet C1 onto any part of the object 10 from any distance.

[0049] Next, the object 10 and the nozzle 102 are immersed in the turbid treatment liquid 105 of the abrasive material 106.

[0050] First, the object 10 is fixed on the mounting platform 104. The object 10 is fixed in a position where the inlet 23 of the object hole 20 faces upward and the end of the outlet 24 of the inner side 211 is parallel to the vertical direction.

[0051] Next, the fixed platform 104 is moved downwards to immerse the object 10 in the treatment liquid 105 stored in the tank 101.

[0052] Next, the nozzle 102 is moved and immersed in the treatment liquid 105, and the jet C1 is directed along the jet axis 30. The nozzle 102 is positioned above the target hole 20. The position of the nozzle 102 in the X direction is opposite to the end of the target hole 20 in the X direction.

[0053] Next, the supporting structural material 26 is removed through cavitation treatment.

[0054] First, start the high-pressure fluid supply source, such as... Figure 1 As shown, a jet C1 is ejected from the nozzle 103 of the nozzle 102 along the jet axis 30. Preferably, the jet C1 is a straight rod-shaped jet.

[0055] The jet C1 contains numerous cavitation bubbles. The jet C1 entrains the abrasive material 106, which collides with the support structure material 26 and the side surface 25 of the target hole 20. The support structure material 26 is broken or cut by the abrasive material 106 contained in the jet C1. After removing the support structure material 26, the side surface 25 is smoothed by the abrasive material 106 contained in the jet C1. The side surface 25 is shot-peened by the impact force of the cavitation bubbles bursting in the jet C1. Compressive residual stress is applied to the side surface 25 through shot peening.

[0056] Next, under the state of ejecting jet C1, as Figure 2 As shown, the nozzle 102 is moved in the X direction along the shape of the object hole 20. This allows the jet C1 to reach the entire interior area of ​​the object hole 20. Preferably, as indicated by arrow A1, the nozzle 102 is moved while jet C1 is being ejected.

[0057] In this way, the jet C1 removes the supporting structure material 26 from the entire area inside the target hole 20. At the same time, the jet C1 smooths the inner surface 211 and the outer surface 212 of the target hole 20 and performs shot peening.

[0058] Thus, in this embodiment, the object 10 is shaped by additive manufacturing, and the supporting structural material 26 that was shaped is removed by cavitation treatment, thereby becoming a product. During cavitation treatment, by bringing the jet axis 30 close to the inner surface 211 of the bend 210, the abrasive material 106 reaches the bend, and the area acted by the jet C1 does not deviate from the outer periphery of the bend 210, thus properly treating the entire area inside the object hole 20.

[0059] In this embodiment, at the end of the target hole 20 on the outlet 24 side, the spray axis 30 is along the inner surface 211. This facilitates shot peening of the inner circumferential region of the curved portion 210. If the spray axis 30 is oriented vertically downwards, it is unaffected by gravity, making it easier for the jet C1 to reach the target location. When the jet C1 is a straight rod-shaped jet, the dynamic pressure of the jet C1 increases. Therefore, it is possible to facilitate the fracture and removal of the supporting structural material 26. Because the jet C1 is a straight rod-shaped jet, the side surface 25 is less prone to deformation.

[0060] <Second Implementation Method>

[0061] The cavitation treatment method of the second embodiment will be described. In this embodiment, the shape of the object 10a differs from that of the first embodiment. For example... Figure 5As shown, the object 10a of this embodiment has an object hole 20a. The object hole 20a has a circular cross-section. The object hole 20a has an inlet 23a, an outlet 24a, and a side surface 25a. The object hole 20a has an upper straight portion 220, a curved portion 210a, and a lower straight portion 230. The upper straight portion 220 extends from the inlet 23a in a downwardly inclined direction towards the -Y direction. Figure 5 The curved portion 210a extends in a straight line from the lower end of the upper straight portion 220 in a downward-sloping direction towards the +Y direction. Figure 5 The lower straight portion 230 bends downwards and to the right from the lower end of the curved portion 210a in a downward-sloping direction towards the +Y direction. Figure 5 It extends in a straight line to the lower right (towards exit 24a). Figure 5 In the diagram, line segment L1 represents the boundary between the upper straight portion 220 and the curved portion 210a. Line segment L2 represents the boundary between the curved portion 210a and the lower straight portion 230. The curved portion 210a has an inner surface 211a and an outer surface 212a. The lower straight portion 230 has a lower inner surface 231. The lower inner surface 231 is a surface connected to the inner surface 211a.

[0062] like Figure 5 As shown, the injection axis 30a is defined in a cross-section passing through the central axis of the target hole 20a. The injection axis 30a has at least a portion that is closer to the inner surface 211a than the outer surface 212a of the bend 210a. The injection axis 30a extends along the inner surface 211a on the outlet 24a side compared to the end of the inlet 23a of the bend 210a. The injection axis 30a passes through the inlet 23a. The angle β between the injection axis 30a and the lower inner surface 231 is preferably as small as possible. The injection axis 30a can be a straight line entering the target hole 20a from the inlet 23a and passing through the outlet 24a. The injection axis 30a can be a straight line entering the target hole 20a from the inlet 23a and intersecting the side surface 25 of the target hole 20a.

[0063] In this embodiment, the cavitation treatment apparatus 100 is substantially the same as that in the first embodiment. The only difference between the cavitation treatment method in this embodiment and the first embodiment is that the nozzle 102 is not moved in the X direction.

[0064] This invention is not limited to the embodiments described above. Various modifications can be made without departing from the spirit of this invention, and all technical matters included in the technical concept described in the claims are subject to this invention. Although the embodiments shown are preferred examples, those skilled in the art can implement various alternatives, modifications, variations, or improvements based on the content disclosed in this specification, and these are included within the technical scope described in the appended claims.

Claims

1. A cavitation treatment method, wherein, Objects (10, 10a) including object holes (20, 20a) are manufactured by additive manufacturing, the object holes (20, 20a) having curved portions (210, 210a) that curve from the inlet (23, 23a) to the outlet (24, 24a). The object (10, 10a) and the nozzle (102) with the nozzle (103) are immersed in a turbid treatment liquid (105) of abrasive material (106). A jet (C1) of the treatment liquid (105) with cavitation bubbles is ejected from the nozzle (103) along the jet axis (30) along the jet axis (30). The jet axis (30) is a straight line from the outside to the inside of the object holes (20, 20a). The straight line has a portion that is closer to the inner surface (211, 211a) on the outlet (24, 24a) side than the inlet (23, 23a) of the object holes (20, 20a). The inner surface (211, 211a) is the inner circumferential surface of the curved portion (210, 210a) in the side surface (25) of the object holes (20, 20a). The interior of the target hole (20, 20a) is cavitated using the jet (C1).

2. The cavitation treatment method according to claim 1, wherein, The injection axis (30) extends along the inside side of the inner side (211).

3. The cavitation treatment method according to claim 1 or 2, wherein, The jet (C1) is a straight, rod-shaped jet.

4. The cavitation treatment method according to any one of claims 1 to 3, wherein, The jet axis (30) extends downward in the vertical direction.

5. The cavitation treatment method according to any one of claims 1 to 4, wherein, The object (10) also has a supporting structural material (26) inside the object hole (20) that supports the side surface (25). The supporting structure material (26) is removed using the jet (C1).

6. The cavitation treatment method according to any one of claims 1 to 5, wherein, When shaping the object (10), the minimum tilt angle of the downward-facing surface of the side (25) of the object hole (20) relative to the horizontal direction is 45 degrees or more.

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