Nozzle body

Abstract

The present invention provides a nozzle body for spraying slurry, which enables uniform processing in the opening direction regardless of the direction in which a spraying port is oriented. The nozzle body has: a slurry storage chamber into which a slurry in which abrasive grains and a liquid are mixed is introduced and temporarily stored; an air storage chamber into which pressurized air is introduced and temporarily stored; and a passage path that communicates with the slurry storage chamber and the air storage chamber, and that ejects an ejection material in which the slurry and the pressurized air are mixed from an ejection port, in which the slurry storage chamber is provided with a slurry introduction port into which the slurry is introduced, and the slurry introduction port is provided with a swirling member that swirls the slurry.

Description

Technical Field

[0001] The present invention relates to a nozzle body for spraying a blasting material onto a workpiece or the like, and more particularly to a nozzle body for wet blasting using a blasting material obtained by mixing slurry and air as the blasting material. Background Art

[0002] Conventionally, a wet blasting method is performed in which a slurry in which a liquid and abrasive grains are mixed is prepared and the slurry is sprayed onto a workpiece using compressed air to treat the surface of the workpiece. This wet blasting is also called wet sandblasting or liquid honing.

[0003] Here, in wet blasting, it is sometimes important to make the slurry collide with the workpiece uniformly and at high output. For example, in the case of shot peening treatment in which the mechanical properties of the workpiece are changed by making the shot (abrasive grains, etc.) contained in the slurry collide with the surface of the workpiece, it is required that the collision energy of the shot is high and that the shot can collide with the surface of the workpiece uniformly.

[0004] As nozzle bodies capable of performing wet blasting uniformly at high output over a wide range, nozzle bodies described in Patent Documents 1 and 2 are known.

[0005] In the nozzle body described in patent document 1, an air injection passage is arranged near a slurry storage chamber for introducing and temporarily storing a slurry mixed with abrasive grains and liquid, and pressurized air is passed through the air injection passage to extract the slurry from the slurry storage chamber via a derivation passage having a specified length, and the slurry and the pressurized air are sent to a mixing chamber for mixing, and the injection material mixed with the pressurized air and the slurry is injected from a slit-shaped injection portion, wherein the derivation passage is arranged as a porous structure in which small holes are arranged side by side in the length direction of the derivation passage.

[0006] In addition, in the nozzle body described in Patent Document 2, a slurry storage chamber for introducing and temporarily storing a slurry mixed with particles and liquid is provided, and an air storage chamber for introducing and temporarily storing pressurized air is provided, and an air injection passage is connected to the air storage chamber, and the pressurized air stored in the air storage chamber is introduced from the air injection passage into the mixing chamber, so that the slurry is discharged from the slurry storage chamber to the mixing chamber and the slurry and the pressurized air are mixed, and the injection material mixed with the pressurized air and the slurry is injected toward the workpiece from the slit-shaped injection port, wherein the slit-shaped injection port is an opening shape that is short in the length direction of the workpiece and long in the width direction, and between the mixing chamber and the slit-shaped injection port, a nozzle for injecting the injection material is provided. The invention relates to a passage path that can be straight, and the positional relationship between the air injection passage, the passage path and the slit-shaped injection port is set to be a straight line. The air injection passage is arranged as a porous structure in which small holes are arranged in parallel. The passage cross-sectional area of ​​the air injection passage in a direction perpendicular to the passage direction of the pressurized air is the sum of the passage cross-sectional areas of the small holes in a direction perpendicular to the passage direction of the pressurized air. The ratio of the opening area of ​​the slit-shaped injection port to the passage cross-sectional area of ​​the air injection passage in a direction perpendicular to the passage direction of the pressurized air is set to 2.0 to 1.0:1.0. Furthermore, the ratio of the passage cross-sectional area of ​​the air injection passage to the passage cross-sectional area of ​​the pressurized air in the air storage chamber in a direction perpendicular to the passage direction of the pressurized air is set to 1.0:3.0 or more.

[0007] The nozzle body described in Patent Document 1 has a porous structure in which small holes are arranged in parallel in the longitudinal direction of the outlet passage. Therefore, even from a very long slit-shaped injection port, abrasive, liquid and pressurized air can be injected in a uniform mixed state.

[0008] The nozzle body described in Patent Document 2 can perform wet blasting with high output and uniformity even when the pressure of the pressurized air is increased during shot peening treatment by appropriately setting the opening area of ​​the slit-shaped injection port, the passage cross-sectional area of ​​the air injection passage, and the ratio of the passage cross-sectional area in the direction perpendicular to the passage direction of the pressurized air in the air storage chamber.

[0009] Prior art literature

[0010] Patent Literature

[0011] Patent Document 1: (Japan) Patent No. 3540713

[0012] Patent Document 2: (Japan) Patent No. 4210076 Summary of the invention

[0013] Technical problem to be solved by the invention

[0014] However, according to the conventional nozzle body, in addition to the case where the workpiece is processed by directing the slit-shaped injection port downward, when the workpiece is processed by directing the slit-shaped injection port horizontally and arranging the opening direction of the slit-shaped injection port in a vertical direction, Figure 8 As shown, there is a technical problem that a concentration difference of the slurry occurs in the opening direction of the slit-shaped injection port, and the uniformity of the treatment in the opening direction is impaired due to the concentration difference.

[0015] Such technical issues as Figure 8 As shown, it can be confirmed that when the slurry has a low concentration (for example, 7.5 Vol%), the difference in the treatment time in the opening direction (measurement position) is greater than when the slurry has a high concentration (for example, 27.5 Vol%).

[0016] The present invention is made to solve the above-mentioned technical problems, and its object is to provide a nozzle body for spraying slurry, which can make the treatment uniform in the opening direction no matter which direction the spray port is oriented for treatment.

[0017] Technical solutions for solving technical problems

[0018] The nozzle body of the present invention for solving the above-mentioned technical problems comprises: a slurry storage chamber, which introduces and temporarily stores slurry mixed with abrasive and liquid; an air storage chamber, which introduces and temporarily stores pressurized air; a passage, which is connected to the slurry storage chamber and the air storage chamber, and sprays a spray material mixed with the slurry and the pressurized air from a spray port, and is characterized in that the slurry storage chamber has a slurry inlet for introducing the slurry, and the slurry inlet has a swirl component for causing the slurry to swirl.

[0019] In addition, in the nozzle body of the present invention, preferably, the rotating member comprises: an inlet portion, which introduces the slurry from a direction intersecting with the inlet direction of the pressurized air; and an outlet portion, which outlets the slurry in the slurry storage chamber in a direction substantially parallel to the inlet direction of the pressurized air.

[0020] Furthermore, in the nozzle body of the present invention, it is preferable that the swirl member includes a swirl portion body connecting the introduction portion and the discharge portion.

[0021] In the nozzle body of the present invention, it is preferable that the swirl portion main body is arranged on a circle substantially concentric with the outlet portion, and the introduction portion is extended in a tangential direction of the swirl portion main body.

[0022] Furthermore, in the nozzle body of the present invention, it is preferable that the injection port is in a slit shape extending in the width direction of the workpiece.

[0023] In addition, in the nozzle body of the present invention, it is preferred that the slurry storage chamber has a slurry storage chamber opening at the lower end along the inlet direction of the pressurized air, the slurry storage chamber opening is connected to the injection port, and has a slit-shaped opening along the width direction, and a flow path adjustment component is provided on the inner wall of the slurry storage chamber, the height along the inlet direction of the pressurized air and the width dimension along the width direction do not overlap with the slurry storage chamber opening.

[0024] Furthermore, in the nozzle body of the present invention, it is preferable that the flow path adjusting member is a partition member detachably assembled to the slurry storage chamber.

[0025] In the nozzle body of the present invention, preferably, the partition member is mounted on both ends of the slurry storage chamber in the width direction, and the partition member includes a base mounted on a side wall of the slurry storage chamber and an extension extending from the base in the width direction.

[0026] In the nozzle body of the present invention, preferably, the front end of the extension portion is formed so as not to overlap with the slurry introduction port and has an inclined surface inclined with respect to an introduction direction of the slurry introduced from the slurry introduction port.

[0027] Furthermore, the wet shot peening method of the present invention is characterized in that the slurry is projected onto the surface of the workpiece using the nozzle body.

[0028] Effects of the Invention

[0029] According to the nozzle body of the present invention, since the inlet for introducing the slurry is provided with a swirling member for swirling the slurry, the slurry is stirred by the swirling in the slurry storage chamber, and the concentration of the slurry in the slurry storage chamber becomes uniform. Even in the case where the nozzle body is configured in a manner of projecting in the horizontal direction, for example, the concentration of the slurry can be made uniform regardless of where the injection port is, and the reduction in treatment quality can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a perspective view of a wet blasting apparatus using the nozzle body according to the first embodiment of the present invention.

[0031] Figure 2 It is an exploded perspective view of the nozzle body according to the first embodiment of the present invention.

[0032] Figure 3 yes Figure 1 AA section view in.

[0033] Figure 4 yes Figure 3 BB section view in.

[0034] Figure 5 yes Figure 4 CC section view in.

[0035] Figure 6 The nozzle body of the second embodiment of the present invention is Figure 3 The corresponding cross-sectional view.

[0036] Figure 7 yes Figure 6 DD section view in.

[0037] Figure 8 This is a graph showing the processing time until the area coverage reaches 100% at each measurement position in the slit width direction of the nozzle body according to the first embodiment of the present invention.

[0038] Fig. 9 This is a graph showing the processing time characteristics of the strength of the nozzle body according to the first embodiment of the present invention.

[0039] Fig.10 This is a graph showing the processing time until the area coverage reaches 100% at each measurement position in the slit width direction of the nozzle body according to the second embodiment of the present invention.

[0040] Fig.11 This is a graph showing the processing time characteristics of the strength of the nozzle body according to the second embodiment of the present invention.

[0041] Fig.12 This is a graph showing the processing time until the area coverage reaches 100% at each measurement position in the slit width direction of the conventional nozzle body. DETAILED DESCRIPTION

[0042] Hereinafter, preferred embodiments for implementing the present invention will be described using the accompanying drawings. It should be noted that the following embodiments do not limit the inventions involved in the claims, and all combinations of features described in the embodiments are not necessarily required for the solutions of the invention.

[0043] [First embodiment]

[0044] Figure 1 is a perspective view of a wet blasting apparatus using a nozzle body according to a first embodiment of the present invention. Figure 2 is an exploded perspective view of a nozzle body according to a first embodiment of the present invention, Figure 3 yes Figure 1 AA section view in the figure, Figure 4 yes Figure 3 BB section view in Figure 5 yes Figure 4 CC section view in.

[0045] like Figure 1 As shown, the nozzle body 10 of this embodiment is applied to a wet blasting apparatus 1. The wet blasting apparatus 1 sprays a blasting material 5 onto the surface of a workpiece W held by a holding portion 2 to perform surface treatment on the workpiece W. The nozzle body 10 sprays the blasting material 5 in a strip shape from a slit-shaped spraying port 11 extending in the width direction of the workpiece W.

[0046] It should be noted that the wet blasting apparatus 1 to which the nozzle body 10 of the present embodiment is applied can be used to perform various conventionally known processes, but is preferably used for wet shot peening, for example.

[0047] The spray material 5 is preferably a slurry that is a mixture of a liquid and abrasive grains. The liquid contained in the slurry plays a role in transporting the abrasive grains described later to the surface of the workpiece. Therefore, as long as it can play this role, any liquid other than a flammable substance can be used. Specifically, water is preferably used from the perspective of environmental considerations and cost.

[0048] The abrasive grains are transported to the surface of the workpiece by the liquid, and play a role in performing desired processing on the surface of the workpiece. Therefore, any abrasive grains can be used as long as they can play this role.

[0049] Specifically, as the material of the abrasive, ceramics, resins, and metals can be cited, and more specifically, aluminum oxide, glass, zirconium oxide, and stainless steel can be cited. In addition, as the shape of the abrasive, polygonal, spherical, and true spherical shapes can be cited. In addition, as the size of the abrasive, abrasives of about 1 μm to about 300 μm can be appropriately selected. It should be noted that in the nozzle body 10 of the present embodiment, it is preferred to use abrasives with a high specific gravity (for example, 6 or more), and the diameter of the abrasive is preferably, for example, about 250 μm.

[0050] In addition, in order to apply higher compressive residual stress to a workpiece with high hardness (a workpiece with high hardness), it is necessary to increase the collision energy when the projection material contained in the slurry collides with the workpiece. However, as the hardness of the workpiece increases, energy loss is likely to occur in the collision energy when the projection material contained in the slurry collides with the workpiece. Due to this energy loss, the problem of not being able to apply sufficient compressive residual stress to the workpiece may arise. In addition, when the projection pressure (injection pressure) of the slurry is increased in order to increase the collision energy, the problem of the projection material being broken may occur.

[0051] Therefore, in the wet shot peening method in this case, yttria-stabilized zirconia is used as the projection material. In other words, in the wet shot peening method using the nozzle body 10 of the present embodiment, a slurry in which a liquid and yttria-stabilized zirconia are mixed is used. The yttria-stabilized zirconia referred to in this application specification refers to zirconia whose crystal structure is stabilized by yttria.

[0052] The content ratio of abrasive grains relative to the whole slurry is not particularly limited and can be appropriately designed according to the material of the workpiece, the processing area, and the desired processing degree. For example, a high concentration of 30 Vol% (72 wt%) or more relative to the volume of the whole slurry is preferred. In this case, stress can be applied to the workpiece W more effectively and efficiently.

[0053] In addition to the above-mentioned liquid and abrasive grains, the slurry may also contain a mixed material having various functions, for example, a rust inhibitor. By containing a rust inhibitor in the slurry used in the wet blasting method, a rust-proof effect can be imparted while the wet blasting is performed on the surface of the workpiece as in the conventional method. In addition, various additives may be added to replace the rust inhibitor to the extent that the effects of each component are not hindered.

[0054] like Figure 2 As shown, the nozzle body 10 is constructed to include: a long strip component 20 that is long in the width direction of the workpiece W (left-right direction, a direction perpendicular to the moving direction when processing is implemented) and short in the front-to-back direction (moving direction when processing is implemented); a plate-like component 30 that is connected to the lower part of the long strip component 20 in a vertically arranged state and has a slit-shaped injection port 11 at the lower end, is long in the width direction and has a thin wall; and a block-shaped embedded component 40 that is connected to the upper part of the long strip component 20 in an embedded state.

[0055] like Figure 3 As shown, a plurality of hole-shaped through-paths 21 formed at predetermined intervals are provided inside the long member 20. The through-path 21 is preferably formed to be about φ2.5, for example, and an air injection path 43 formed on a precursor 41 described later and introducing pressurized air into the through-path 21 is provided adjacently thereto.

[0056] In addition, on the side of the long strip member 20 (the side facing the rear body 42 described later), a confluent path 22 is formed at the upper end of the through path 31 formed on the plate-like member 30, which crosses obliquely with respect to the vertical direction. The inclination angle of the confluent path 22 is preferably formed at 30° to 60°, and more preferably at about 45°. It should be noted that the confluent path 22 is different from the through path 21, and is preferably formed in a slit shape that is longer in the width direction. In addition, a pair of engaging portions 23 extending downward from the side are formed below the long strip member 20.

[0057] The plate-like member 30 is provided with a passage 31 that is connected to the slit-shaped injection port 11 formed at the lower end and through which the injection material 5 can pass straightly. In addition, a convex portion 32 is formed at the upper end of the plate-like member 30 to engage with a pair of engaging portions 23, 23 formed on the long member 20. In addition, a pair of engaging convex portions 33 are formed on the side of the plate-like member 30.

[0058] It should be noted that the positional relationship among the opening of the air injection passage 43 , the through path 21 , the passage path 31 , and the slit-shaped injection port 11 is set to be linear.

[0059] The embedded component 40 is formed of a front body 41 and a rear body 42, and clamps the elongated component 20 and the plate-like component 30 in a direction perpendicular to the width direction. In addition, the front body 41 and the rear body 42 of the embedded component 40 are respectively formed with protrusions 44, 44 that engage with the engaging protrusions 33 formed on the plate-like component 30.

[0060] The front body 41 is formed with an air storage chamber 45 for introducing and temporarily storing pressurized air, an air introduction port 46 for introducing pressurized air into the air storage chamber 45 , and an air injection passage 43 communicating with the air storage chamber 45 .

[0061] like Figure 2 As shown in FIG. 4 , the air storage chamber 45 is formed by extending in the width direction of the front body 41, and the air inlet 46 is formed in a single manner substantially in the center of the front body 41. Figure 4 As shown, cover bodies 12 are attached to both ends of the embedded member 40 in the width direction via sealing members 13 , and the air storage chamber 45 is closed in the width direction by the cover bodies 12 .

[0062] In addition, the base end side of the air injection passage 43 is formed as a through passage that penetrates from the side wall of the rear body 42 side of the air storage chamber 45 toward the rear body 42, and the air injection passage 43 is more preferably extended in the tangential direction from the upper end of the air storage chamber 45. In addition, the front end side of the air injection passage 43 is connected to the through path 21 of the long member 20 when combined with the rear body 42.

[0063] The rear body 42 is formed with a slurry storage chamber 47 for introducing and temporarily storing slurry, a slurry introduction port 48 for introducing slurry into the slurry storage chamber 47, and a slurry storage chamber opening 49 communicating with the slurry storage chamber 47. The slurry introduction port 48 is provided with a swivel member 60 described later.

[0064] like Figure 2 As shown in FIG. 4 , the slurry storage chamber 47 is formed by extending along the width direction of the rear body 42, and the slurry introduction port 48 is formed in a single manner at the approximate center of the rear body 42. Figure 4As shown, cover bodies 12 are attached to both ends of the embedded member 40 in the width direction via sealing members 13 , and the slurry storage chamber 47 is closed in the width direction by the cover bodies 12 .

[0065] In addition, the base end side of the slurry storage chamber opening 49 is formed as a through passage that penetrates from the side wall of the front body 41 side of the slurry storage chamber 47 toward the front body 41. In addition, the slurry storage chamber opening 49 is formed by extending from the lower end of the slurry storage chamber 47 in the tangential direction, and the front end side is connected to the confluent path 22 of the long member 20. It should be noted that the nozzle body 10 of this embodiment is composed of the slurry storage chamber opening 49 and the confluent path 22 to form a slurry confluent path 50.

[0066] In addition, in each of the above structures, a protective layer made of polyurethane rubber or the like is formed on the path through which the slurry passes (the inner wall of the slurry storage chamber 47, the inner wall of the slurry storage chamber opening 49, etc.). The protective layer is used to prevent the slurry (especially the granular body) from grinding the path through which the slurry passes, and it is confirmed that the life of the nozzle body 10 is extended several times due to the presence of the protective layer.

[0067] In addition, if Figure 4 As shown, the slurry storage chamber opening 49 is formed in a slit shape that is long in the width direction. Spacer members 51 are installed at both ends of the slurry storage chamber 47 in the width direction to prevent the slurry introduced from the slurry introduction port 48 from being retained in the slurry storage chamber 47 .

[0068] like Figure 3 to Figure 5 As shown, the swirl member 60 includes: a swirl body 60a; a connecting portion 61 extending from the swirl body 60a toward the slurry inlet 48 and having an outlet portion 64 formed therein; a swirl portion 62 formed on the swirl body 60a; and an introduction portion 63 continuous with the swirl portion 62.

[0069] The swirl portion body 60a is a block-shaped component, and is formed into a swirl portion 62 having a circular cross-section and penetrating in the vertical direction. The swirl portion 62 includes an annular portion 62a extending from the upper side of the swirl portion body 60a in a substantially vertical direction, and an inclined tapered portion 62b connecting the lower end of the annular portion 62a and the outlet portion 64. Figure 5 As shown, the swirling portion 62 and the lead-out portion 64 are arranged on substantially concentric circles.

[0070] In addition, if Figure 4 As shown in FIG. 1 , an introduction portion 63 is installed on the side of the swirl portion body 60a, and a hose or the like for supplying slurry to the introduction portion 63 is installed. The introduction portion 63 is formed on the side of the swirl portion body 60a in a manner substantially orthogonal to the annular portion 62a of the swirl portion 62. Figure 5As shown, the introduction portion 63 is installed in a manner extending in the tangential direction of the swirl portion 62. In this way, the introduction portion 63 intersects with a direction substantially orthogonal to the opening direction of the slurry introduction port 48 for introducing the slurry into the nozzle body, and the outlet portion 64 is arranged in a direction substantially parallel to the opening direction of the slurry introduction port 48.

[0071] In the nozzle body 10 constructed as described above, the slurry introduced into the slurry storage chamber 47 is swirled by the swirling member 60 and stirred in the slurry storage chamber 47, so that the concentration of the slurry storage chamber 47 becomes uniform, thereby being able to suppress the reduction in processing quality regardless of the direction in which the slurry is sprayed, such as by causing the nozzle body 10 to project the slurry in a horizontal direction.

[0072] In addition, the nozzle body 10 of this embodiment is configured so that the inlet portion 63 extends along the tangential direction of the swirling portion 62 of the swirling member 60. Therefore, the slurry introduced from the inlet portion 63 is discharged to the outlet portion 64 while being swirled along the inner wall of the swirling portion 62, so that the slurry can be given a reliable swirling motion.

[0073] Furthermore, the nozzle body 10 of the present embodiment guides the slurry introduced into the swirl portion 62 to the guide portion 64 via the tapered portion 62 b , so the swirl force applied to the slurry introduced from the tangential direction of the annular portion 62 a is not attenuated.

[0074] [Second embodiment]

[0075] In the nozzle body 10 of the first embodiment described above, an embodiment in which the spacer members 51 are mounted at both ends in the width direction of the slurry storage chamber 47 is described. The nozzle body 10a of the second embodiment described next is a nozzle body that describes an example of a slurry storage chamber 47 having a different form from the first embodiment. It should be noted that the same reference numerals are given to the same or similar components as those in the first embodiment, and description thereof is omitted.

[0076] Figure 6 The nozzle body of the second embodiment of the present invention is Figure 3 The corresponding cross-sectional view, Figure 7 yes Figure 6 DD section view in.

[0077] like Figure 6 As shown, the nozzle body 10a of this embodiment is equipped with a flow path adjustment member (spacer 70) along the inner wall of the slurry storage chamber 47. Figure 7 As shown, the partition member 70 is provided to extend in the width direction along the inner wall surface of the slurry storage chamber 47 on the slurry introduction port 48 side (the upper portion of the slurry storage chamber 47 ).

[0078] The spacer member 70 is composed of a pair of spacer member pieces 71, 71 extending from both end surfaces of the slurry storage chamber 47 toward the center. The spacer member piece 71 is preferably fastened together with the cover body 12 or the sealing member 13 of the nozzle body 10a. Figure 7 It is preferable that the spacer member pieces 71 arranged on the left and right sides have the same shape.

[0079] The spacer member sheet 71 includes a base portion 71a mounted on the side wall of the slurry storage chamber 47 and an extension portion 71b extending from the base portion 71a along the width direction of the slurry storage chamber 47. In addition, the front end of the extension portion 71b is configured so that the front end portions do not close the opening of the slurry introduction port 48, and an inclined surface 72 is formed at the opposite end in the vertical direction relative to the slurry introduction port 48, so that the flow path continuous from the slurry introduction port 48 is formed in a terminal expansion shape.

[0080] like Figure 6 as well as Figure 7 As shown in the figure, the spacer member sheet 71 is extended along the width direction of the slurry storage chamber 47, but is configured not to close the slurry storage chamber opening 49. As a result, the slurry introduced from the slurry introduction port 48 can be prevented from being retained in the slurry storage chamber 47, thereby suppressing the reduction in the flow rate of the slurry. In addition, by suppressing the reduction in the flow rate of the slurry, even when the nozzle body 10a of this embodiment is arranged in the horizontal direction and the slurry is projected in the horizontal direction, the uniformity in the width direction of the nozzle body 10a can be improved.

[0081] [Example]

[0082] Next, the present invention will be described in more detail with reference to Examples. Figure 8 is a graph showing the processing time until the area coverage reaches 100% at each measurement position in the slit width direction of the nozzle body according to the first embodiment of the present invention. Fig. 9 is a graph showing the processing time characteristics of the strength of the nozzle body according to the first embodiment of the present invention, Fig.10 is a graph showing the processing time until the area coverage reaches 100% at each measurement position in the slit width direction of the nozzle body according to the second embodiment of the present invention. Fig.11 This is a graph showing the processing time characteristics of the strength of the nozzle body according to the second embodiment of the present invention.

[0083] First, the nozzle body 10 of the first embodiment is arranged in the horizontal direction, and the slurry with a concentration of 9.1 Vol% and 22.9 Vol% is respectively sprayed using a projection material with a specific gravity of 6, and the ratio of the collision marks at the position in the slit width direction of the slit-shaped injection port, that is, the processing time until the area coverage reaches 100%. The test conditions are as follows. Air pressure: 0.40 MPa, slurry pressure: 0.24 MPa. In addition, the width of the nozzle body 10 arranged in the horizontal direction is 60 mm, and the measurement position is arranged at the -24 mm side at the bottom and the +24 mm side at the top, and the slurry is projected. In addition, the measurement position is 5 points at intervals of 12 mm from the opening end of the injection port as the measurement position.

[0084] It should be noted that in Figure 8 The reason for using the treatment time until the area coverage reaches 100% is as follows. The "treatment quality / intensity" in the sandblasting treatment is determined by "the energy (speed × mass) of the projected material" × "the number of projected material particles (concentration)". Here, if the particle size and specific gravity of the projected material are uniform, the "mass" is constant.

[0085] In addition, the "speed" depends on the pressure and flow rate of the compressed air. In the conventional air flow path structures described in Patent Documents 1 and 2, the pressure and flow rate are constant in the nozzle width direction, and this structure is also applicable to the nozzle body of this embodiment.

[0086] "Concentration" refers to the amount of projected material in the slurry. In the conventional nozzle structure, it is easily affected by gravity, especially when projecting in the horizontal direction, resulting in concentration differences in the nozzle width direction. The nozzle body of this embodiment reduces and suppresses the concentration differences caused by gravity in the slurry flow path.

[0087] As mentioned above, "processing time" refers to the time (projection time) required to obtain an arbitrary processing state / quality (this time it is "area coverage 100%"), which is "the time until the projected material particles with equal (constant) speed collide with the surface of the processed material in the same (constant) number."

[0088] In the nozzle body of this embodiment, since the "speed" is constant (uniform) in the width direction of the nozzle, the "processing time" can be replaced by the "projection material concentration". Originally, in order to express the uniformity in the nozzle width direction, it is best to express the concentration in the nozzle width direction, but it is difficult to measure the local concentration in the nozzle width direction. Therefore, in Figure 8 In FIG. 1 , “processing time until the area coverage reaches 100%” is used as a value indicating the quality / intensity of the processing.

[0089] like Figure 8As shown, when the nozzle body 10 of this embodiment is projected in the horizontal direction, it can be confirmed that the processing time is uniform regardless of the measurement position. Fig.12 Compared with the conventional nozzle body as shown, it can be confirmed that the variation in the opening direction of the injection port is suppressed.

[0090] In addition, if Fig. 9 As shown, regarding the processing time characteristics of strength, it can also be confirmed that the arc height, which is the height of the processed surface extended by the knocking, is uniform regardless of the measurement position. It should be noted that the measurement of the processing time characteristics of strength was performed using a projection material (TZ-B250) with a specific gravity of 6 and a concentration set to 23.0 Vol%. Regarding the direction of the injection of the nozzle body 10 and the measurement position, the same conditions as the measurement conditions of the above-mentioned area coverage were set.

[0091] It has been confirmed that the nozzle body 10 of the present embodiment configured as described above does not deteriorate the processing quality even when the nozzle body 10 is arranged in the horizontal direction and the slurry is sprayed in a direction other than vertically downward with respect to the workpiece.

[0092] It should be noted that the nozzle body 10 of the present embodiment can uniformly process a wide processing surface, and therefore, for example, it is preferable to project slurry onto a glass surface for transparent roughening pretreatment.

[0093] Next, the nozzle body 10a of the second embodiment is arranged in the horizontal direction, and a slurry with a concentration set to 5.7 Vol% is sprayed using a projection material with a specific gravity of 6, and the processing time until the ratio of the collision marks at the position in the slit width direction of the slit-shaped injection port, that is, the area coverage rate reaches 100% is measured. The test conditions are as follows. Air pressure: 0.40MPa, slurry pressure: 0.24MPa. In addition, the nozzle body 10a arranged in the horizontal direction is set to be wider than the nozzle body 10 of the first embodiment, specifically, the width is 100mm. In addition, the measurement position is arranged at the -44mm side at the bottom and the +44mm side at the top, and the slurry is projected. In addition, the measurement position is 5 points at intervals of 22mm from the opening end of the injection port as the measurement position.

[0094] like Fig.10 As shown, when the nozzle body 10a of this embodiment is projected in the horizontal direction, it can be confirmed that the processing time is uniform regardless of the measurement position. Fig.12Compared with the conventional nozzle body shown in FIG. 1 , it can be confirmed that the deviation in the processing of the opening direction of the injection port is suppressed. In addition, in the nozzle body 10 of the first embodiment, if the concentration of the projection material is reduced, there is a case where the uniformity becomes unstable, but according to the nozzle body 10a of the present embodiment, it can be confirmed that even in the case of further expanding the nozzle width or reducing the concentration of the projection material, sufficient performance is provided in terms of uniformity.

[0095] In addition, if Fig.11 As shown, regarding the processing time characteristics of strength, it can also be confirmed that the arc height, which is the height of the processed surface being struck and extended, is uniform regardless of the measurement position. It should be noted that the measurement of the processing time characteristics of strength was performed using a projection material (TZ-B250) with a specific gravity of 6 and a concentration of 5.7 Vol%. The direction and measurement position of the spray of the nozzle body 10a were set to the same conditions as the measurement conditions of the above-mentioned area coverage.

[0096] It has been confirmed that the nozzle body 10 of the first embodiment and the nozzle body 10a of the second embodiment configured as described above do not deteriorate the processing quality even when the nozzle bodies 10 and 10a are arranged in the horizontal direction and the slurry is sprayed in a direction other than vertically downward with respect to the workpiece.

[0097] In addition, the nozzle bodies 10 and 10a of the first and second embodiments are described as nozzle bodies in which the injection port is set to a slit shape, but the shape of the injection port is not limited to the slit shape, and various injection ports can also be applied. In addition, the case where one air inlet 46 and one slurry inlet 48 are formed on the embedded component 40 is described, but the number of the air inlet 46 and the slurry inlet 48 is not limited to this, and can also be appropriately increased. In this case, the swivel member 60 can also be increased according to the number of the slurry inlet 48.

[0098] In addition, in the nozzle body 10a of the second embodiment, the case where the partition member 70 is installed in the slurry storage chamber 47 is described, but the volume of the slurry storage chamber 47 may be reduced, and the slurry storage chamber 47 may be formed into a shape substantially the same as the state where the partition member 70 is installed, so that the flow path adjustment member is formed integrally with the rear body 42. In addition, the nozzle body 10a of the second embodiment describes a method of directly introducing slurry into the slurry introduction port 48, but a swivel member 60 may be installed at the slurry introduction port 48 as in the nozzle body 10 of the first embodiment. It is clear from the description of the claims that such a method of implementing such changes or improvements is also included in the technical scope of the present invention.

[0099] Description of Reference Numerals

[0100] 1 wet blasting apparatus, 2 holding portion, 5 blasting material, 10 nozzle body, 11 slit-shaped injection port, 12 cover body, 20 long member, 21 through path, 22 confluent path, 23 engaging portion, 30 plate-shaped member, 31 through path, 32 convex portion, 33 engaging convex portion, 40 embedded member, 41 front body, 42 rear body, 43 air injection passage, 44 protrusion, 45 air storage chamber, 46 air introduction port, 47 slurry storage chamber, 48 slurry introduction port, 49 slurry storage chamber opening, 50 slurry confluent path, 51, 70 spacer member, 60 swivel member, 60a swivel portion body, 61 connecting portion, 62 swivel portion, 62a annular portion, 62b tapered portion, 63 introduction portion, 64 outlet portion, 71 spacer member piece, 71a base portion, 71b extension portion, 72 inclined surface, W workpiece.

Claims

1. A nozzle body, comprising: a slurry storage chamber, the slurry storage chamber introducing and temporarily storing slurry mixed with abrasive grains and liquid; an air storage chamber, the air storage chamber introducing and temporarily storing pressurized air; a passage, the passage communicating with the slurry storage chamber and the air storage chamber, and ejecting a spray material mixed with the slurry and the pressurized air from an ejection port, characterized in that: The slurry storage chamber has a slurry introduction port for introducing the slurry. The slurry introduction port includes a swirl member for swirling the slurry.

2. The nozzle body according to claim 1, characterized in that The swirl member includes an introduction portion that introduces the slurry from a direction intersecting with an introduction direction of the pressurized air, and an outlet portion that outlets the slurry in the slurry storage chamber in a direction substantially parallel to the introduction direction of the pressurized air.

3. The nozzle body according to claim 2, characterized in that The revolving member includes a revolving portion main body connecting the introduction portion and the discharge portion.

4. The nozzle body according to claim 3, characterized in that The swirl portion body is arranged on a circle substantially concentric with the lead-out portion, The introduction portion is extended along a tangential direction of the gyratory portion body.

5. The nozzle body according to claim 1, characterized in that The injection port is in the shape of a slit extending in the width direction of the workpiece.

6. The nozzle body according to claim 5, characterized in that The slurry storage chamber includes a slurry storage chamber opening at a lower end along the direction in which the pressurized air is introduced, the slurry storage chamber opening communicating with the injection port and opening in a slit shape along the width direction. The inner wall of the slurry storage chamber includes a flow path adjustment member having a height along the introduction direction of the pressurized air and a width along the width direction so as not to overlap with the opening of the slurry storage chamber.

7. The nozzle body according to claim 6, characterized in that The flow path adjusting member is a partition component that is detachably assembled to the slurry storage chamber.

8. The nozzle body according to claim 7, characterized in that The spacer components are respectively installed at both ends of the slurry storage chamber in the width direction. The partition member includes a base portion attached to a side wall of the slurry storage chamber and an extension portion extending from the base portion in the width direction.

9. The nozzle body according to claim 8, characterized in that The front end of the extension portion is formed so as not to overlap with the slurry introduction port, and has an inclined surface inclined with respect to an introduction direction of the slurry introduced from the slurry introduction port.

10. A wet shot peening method, characterized in that: The slurry is projected onto the surface of the workpiece using the nozzle body according to claims 1 to 9.

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