Nozzle body

Abstract

To provide a nozzle body which jets slurry and enables processing to be performed uniformly in an opening direction even when the processing is performed with its jet port directed in any direction.SOLUTION: A nozzle body includes: a slurry storage chamber in which 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 passageway which communicates with the slurry storage chamber and the air storage chamber and injects from an injection port an injection material in which the slurry and the pressurized air are mixed. The slurry storage chamber includes a slurry introduction port for introducing the slurry. The slurry introduction port includes swirling means for swirling the slurry.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a nozzle body for spraying abrasives against a workpiece or the like, and more particularly to a nozzle body for wet blasting that uses abrasives that are a mixture of slurry and air. [Background technology]

[0002] Conventionally, a wet blasting method has been used in which a slurry made by mixing liquid and abrasive grains is prepared, and the slurry is sprayed onto the workpiece using compressed air to treat the surface of the workpiece. This wet blasting method is also called wet blasting or liquid honing.

[0003] Here, in wet blasting, it is sometimes important to collide the slurry uniformly and with high power against the workpiece, etc. For example, in the case of performing peening, which changes the mechanical properties of the workpiece by colliding shots (abrasive grains, etc.) contained in the slurry against the surface of the workpiece, it is required that the shots have high collision energy and can collide uniformly against the surface of the workpiece.

[0004] As a nozzle body capable of spraying wet blasting uniformly and with high power over a wide range in this manner, the nozzle bodies described in Patent Documents 1 and 2 are known.

[0005] The nozzle body described in Patent Document 1 has an air injection passage provided near a slurry storage chamber where a slurry of abrasive grains and liquid is introduced and temporarily stored, and pressurized air passes through this air injection passage to discharge the slurry from the slurry storage chamber via an outlet passage having a predetermined length. The slurry and the pressurized air are sent to a mixing chamber where they are mixed, and the nozzle body sprays the abrasive material formed by mixing the pressurized air and the slurry from a slit-shaped injection portion, and the outlet passage has a porous structure with small holes arranged side by side in the longitudinal direction of the outlet passage.

[0006] Moreover, the nozzle body described in Patent Document 2 is provided with a slurry storage chamber into which a slurry, which is a mixture of granules and liquid, is introduced and temporarily stored, and also with an air storage chamber into which pressurized air is introduced and temporarily stored, 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 a mixing chamber, whereby the slurry is led from the slurry storage chamber to the mixing chamber and the slurry and the pressurized air are mixed, and the nozzle body injects the abrasive material, which is a mixture of the pressurized air and the slurry, from a slit-shaped injection port to a workpiece, and the slit-shaped injection port has 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 passageway through which the aerosol material can travel in a straight line is provided, and the positional relationship between the air injection passageway, the passageway and the slit-shaped injection port is set to be linear, the air injection passageway has a porous structure with small holes arranged side by side, the passageway area of ​​the air injection passageway in a direction perpendicular to the pressurized air passageway is the sum of the passageway cross-sectional areas of the small holes in a direction perpendicular to the pressurized air passageway, the ratio of the opening area of ​​the slit-shaped injection port to the passageway cross-sectional area of ​​the air injection passageway in the direction perpendicular to the pressurized air passageway is set to 2.0 to 1.0:1.0, and further, the ratio of the passageway cross-sectional area of ​​the air injection passageway to the passageway cross-sectional area of ​​the air injection passageway in the direction perpendicular to the pressurized air passageway of the pressurized air in the air storage chamber is set to 1.0:3.0 or more.

[0007] The nozzle body described in Patent Document 1 has an outlet passage in a porous structure with small holes arranged in the longitudinal direction of the outlet passage, so that abrasive grains, liquid, and pressurized air can be sprayed in a uniform mixture even from a very long slit-shaped nozzle.

[0008] The nozzle body described in Patent Document 2 is capable of uniformly spraying wet blast with high output even when the pressure of the pressurized air is increased in the peening process, by appropriately setting the ratio between the opening area of ​​the slit-shaped injection port, the passage cross-sectional area of ​​the air injection passage, and the passage cross-sectional area in the direction perpendicular to the passing direction of the pressurized air in the air storage chamber. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 3540713 [Patent Document 2] Patent No. 4210076 Summary of the Invention [Problem to be solved by the invention]

[0010] However, with conventional nozzle bodies, when a workpiece is processed with the slit-shaped jet orifice facing downward, or when the slit-shaped jet orifice is facing sideways and positioned so that its opening direction is vertical, as shown in Figure 8, a difference in slurry concentration occurs in the opening direction of the slit-shaped jet orifice, causing a problem that the uniformity of processing in the opening direction is impaired.

[0011] As shown in FIG. 8, this issue can be seen in the large difference in processing time in the opening direction (measurement position) when the slurry concentration is low (e.g., 7.5 Vol%) compared to when the concentration is high (e.g., 27.5 Vol%).

[0012] The present invention has been made to solve the above-mentioned problems, and has an object to provide a nozzle body that injects slurry and ensures uniform processing in the direction of the opening regardless of the direction in which the injection port is pointed during processing. [Means for solving the problem]

[0013] In order to solve the above problems, the nozzle body of the present invention is a nozzle body having a slurry storage chamber into which a slurry mixed with abrasive grains and liquid is introduced and temporarily stored, an air storage chamber into which pressurized air is introduced and temporarily stored, and a passageway that communicates with the slurry storage chamber and the air storage chamber and through which an abrasive material mixed with the slurry and the pressurized air is sprayed from an injection port, wherein the slurry storage chamber is provided with a slurry inlet port for introducing the slurry, and the slurry inlet port is provided with a swirling means for swirling the slurry.

[0014] In addition, in the nozzle body according to the present invention, it is preferable that the rotating means comprises an inlet portion which introduces the slurry from a direction intersecting the inlet direction of the pressurized air, and an outlet portion which discharges the slurry in the slurry storage chamber in a direction approximately parallel to the inlet direction of the pressurized air.

[0015] In the nozzle body according to the present invention, it is preferable that the swirling means comprises a swirling portion main body that connects the inlet portion and the outlet portion.

[0016] In the nozzle body according to the present invention, it is preferable that the swirl portion main body is disposed substantially concentrically with the outlet portion, and the inlet portion extends in a tangential direction of the swirl portion main body.

[0017] In the nozzle body according to the present invention, it is preferable that the injection port is in the form of a slit extending along the width direction of the workpiece.

[0018] Furthermore, in the nozzle body according to the present invention, it is preferable that the slurry storage chamber has a slurry storage chamber opening at its lower end along the introduction direction of the pressurized air, which is connected to the injection port and opens in a slit shape along the width direction, and that the inner wall of the slurry storage chamber is provided with a flow path adjustment means whose height along the introduction direction of the pressurized air and whose width dimension along the width direction do not overlap with the slurry storage chamber opening.

[0019] In the nozzle body according to the present invention, it is preferable that the flow path adjusting means is a spacer member that is detachably attached to the slurry storage chamber.

[0020] In addition, in the nozzle body according to the present invention, it is preferable that the spacer member is attached to both ends of the slurry storage chamber in the width direction, and has a base attached to a side wall of the slurry storage chamber, and an extension extending from the base along the width direction.

[0021] In the nozzle body according to the present invention, it is preferable that the tip of the extension portion is formed so as not to overlap with the slurry inlet port and has a slope inclined with respect to the introduction direction of the slurry introduced from the slurry inlet port.

[0022] Moreover, a wet shot peening method according to the present invention is characterized in that the slurry is projected onto a surface of a workpiece using the nozzle body. Effect of the Invention

[0023] According to the nozzle body of the present invention, the inlet for introducing the slurry is provided with a swirling means for swirling the slurry, so that the slurry is stirred by swirling within the slurry storage chamber, and the concentration of the slurry within the slurry storage chamber becomes uniform.Even if the nozzle body is positioned to project the slurry horizontally, for example, the concentration of the slurry can be made uniform at any position of the injection port, making it possible to suppress a decrease in processing quality. [Brief description of the drawings]

[0024] [Figure 1] 1 is a perspective view of a wet blasting apparatus using a nozzle body according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is an exploded perspective view of a nozzle body according to a first embodiment of the present invention. [Diagram 3] Cross section taken along line AA in FIG. [Figure 4] Cross-sectional view taken along line B-B in FIG. [Diagram 5]Cross-sectional view taken along CC in FIG. 4 . [Figure 6] 5 is a cross-sectional view corresponding to FIG. 3 of a nozzle body according to a second embodiment of the present invention. FIG. [Figure 7] Cross-sectional view taken along the line DD in FIG. [Figure 8] 5 is a graph showing the processing time until 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. [Figure 9] 4 is a graph showing the processing time characteristics of the intensity of the nozzle body according to the first embodiment of the present invention. [Figure 10] 10 is a graph showing the processing time until area coverage reaches 100% at each measurement position in the slit width direction of a nozzle body according to a second embodiment of the present invention. [Figure 11] 10 is a graph showing the processing time characteristics of the intensity of a nozzle body according to a second embodiment of the present invention. [Figure 12] 13 is a graph showing the processing time required to achieve 100% area coverage at each measurement position in the slit width direction of a conventional nozzle body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and all of the combinations of features described in the embodiments are not necessarily essential to the solution of the invention.

[0026] [First embodiment] FIG. 1 is an oblique view of a wet blasting processing apparatus using a nozzle body according to a first embodiment of the present invention, FIG. 2 is an exploded oblique view of the nozzle body according to the first embodiment of the present invention, FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, FIG. 4 is a cross-sectional view taken along line BB in FIG. 3, and FIG. 5 is a cross-sectional view taken along line CC in FIG. 4.

[0027] 1, a nozzle body 10 according to this embodiment is suitable for use in a wet blasting treatment apparatus 1. The wet blasting treatment apparatus 1 sprays abrasives 5 onto the surface of a workpiece W held by a holder 2, thereby performing surface treatment on the workpiece W. The nozzle body 10 sprays the abrasives 5 in a band shape from a slit-shaped spray nozzle 11 extending in the width direction of the workpiece W.

[0028] The wet blasting apparatus 1 to which the nozzle body 10 according to this embodiment is applied can be used to perform various conventionally known treatments, but is preferably used for wet shot peening, for example.

[0029] The abrasive 5 is preferably a slurry, which is a mixture of liquid and abrasive grains. The liquid contained in the slurry serves to carry the abrasive grains to the surface of the workpiece, as described below. Therefore, any liquid can be used as long as it can fulfill this role, except for flammable substances. Specifically, it is preferable to use water, from the viewpoints of environmental considerations and cost.

[0030] The abrasive grains are carried to the surface of the workpiece by the liquid and serve to perform the desired processing on the surface of the workpiece. Therefore, any abrasive grains can be used as long as they can perform this function.

[0031] Specifically, the material of the abrasive grains may be ceramics, resin, metal, etc., and more specifically, may be alumina, glass, zirconia, stainless steel, etc. The shape of the abrasive grains may be polygonal, spherical, or spherical. The size of the abrasive grains may be appropriately selected from about 1 μm to about 300 μm. In the nozzle body 10 according to this embodiment, it is preferable to use abrasive grains with a high specific gravity (for example, 6 or more), and the diameter of the abrasive grains may be, for example, about 250 μm.

[0032] Furthermore, in order to impart higher compressive residual stress to a workpiece having high hardness (a workpiece having high hardness), it is necessary to increase the collision energy when the shot material contained in the slurry is collided with the workpiece. However, as the hardness of the workpiece increases, energy loss is likely to occur in the collision energy when the shot material contained in the slurry is collided with the workpiece, and this energy loss can cause a problem in that sufficient compressive residual stress cannot be imparted to the workpiece. Furthermore, if the projection pressure (spray pressure) of the slurry is increased in order to increase the collision energy, a problem can occur in that the shot material is crushed.

[0033] Therefore, in the wet shot peening method in such a case, yttria-stabilized zirconia is used as the shot material. In other words, in the wet shot peening method using the nozzle body 10 according to the present embodiment, a slurry in which a liquid and yttria-stabilized zirconia are mixed is used. In this specification, yttria-stabilized zirconia means zirconia whose crystal structure is stabilized by yttria.

[0034] The content ratio of the abrasive grains in the entire slurry is not particularly limited, and can be appropriately designed according to the material and processing area of ​​the workpiece, and further the desired degree of processing. For example, a high concentration of 30 vol% (72 wt%) or more with respect to the total volume of the slurry is preferable. In this case, stress can be applied to the workpiece W more effectively and efficiently.

[0035] In addition to the liquid and abrasive grains, the slurry may contain a mixture having various functions, for example, a rust inhibitor. By containing a rust inhibitor in the slurry used in the wet blasting method, it is possible to impart a rust prevention effect to the surface of the workpiece while performing a conventional wet blasting process. In place of the rust inhibitor, various additives may be added to the extent that they do not impair the action and effect of each component.

[0036] As shown in Figure 2, the nozzle body 10 is composed of a long member 20 that is long in the width direction of the workpiece W (left and right direction, the direction perpendicular to the direction of movement when processing is performed) and short in the front and rear direction (the direction of movement when processing is performed), a long, thin-walled plate-like member 30 that is connected in a vertical state to the lower part of the long member 20 and is long in the width direction and has a slit-shaped injection port 11 at its lower end, and a block-shaped fitted member 40 that is connected to the upper part of the long member 20 in a fitted state.

[0037] 3, a plurality of hole-like through passages 21 are formed at predetermined intervals inside the elongated member 20. The through passages 21 are preferably formed to have a diameter of, for example, about φ2.5, and an air injection passage 43 for introducing pressurized air into the through passages 21 is provided adjacent to the upper portion of the through passages 21, and is formed in a front body 41 described later.

[0038] Furthermore, on the side of the elongated member 20 (the side facing the rear body 42 described later), a junction path 22 is formed that crosses the upper end of the passage path 31 formed in the plate-like member 30 at an angle to the vertical direction. The inclination angle of the junction path 22 is preferably formed at 30° to 60°, and more preferably at about 45°. Unlike the through path 21, the junction path 22 is preferably formed in the shape of a slit that is long in the width direction. Furthermore, a pair of engagement portions 23 are formed below the elongated member 20, extending downward from the side.

[0039] The plate-like member 30 is provided with a passage 31 that communicates with the slit-shaped injection port 11 formed at the lower end and through which the injection material 5 can travel in a straight line. In addition, a protrusion 32 is formed at the upper end of the plate-like member 30 to engage with a pair of engagement portions 23, 23 formed on the elongated member 20. Furthermore, a pair of engagement protrusions 33 are formed on the sides of the plate-like member 30.

[0040] The positional relationship between 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.

[0041] The fitted member 40 is formed of a front body 41 and a rear body 42, and holds the long member 20 and the plate-like member 30 in a direction perpendicular to the width direction. In addition, the front body 41 and the rear body 42 of the fitted member 40 are each formed with protrusions 44, 44 that engage with the engaging protrusion 33 formed on the plate-like member 30.

[0042] The front body 41 is formed with an air storage chamber 45 into which pressurized air is introduced and temporarily stored, an air inlet 46 through which the pressurized air is introduced into the air storage chamber 45, and an air injection passage 43 which communicates with the air storage chamber 45.

[0043] 2, the air storage chamber 45 is formed to extend in the width direction of the front body 41, and the air inlet 46 is formed singly in the approximate center of the front body 41. Note that, as shown in FIG. 4, the lid body 12 is attached via the seal member 13 to both ends in the width direction of the fitted member 40, and the air storage chamber 45 is closed in the width direction by the lid body 12.

[0044] The air injection passage 43 has a base end formed as a through passage penetrating from the side wall of the air storage chamber 45 on the rear body 42 side toward the rear body 42, and more preferably, the air injection passage 43 extends in a tangential direction from the upper end of the air storage chamber 45. The tip side of the air injection passage 43 communicates with the through passage 21 of the elongated member 20 when combined with the rear body 42.

[0045] Rear body 42 is formed with a slurry storage chamber 47 in which the slurry is introduced and temporarily stored, a slurry inlet 48 through which the slurry is introduced into slurry storage chamber 47, and a slurry storage chamber opening 49 which communicates with slurry storage chamber 47. In addition, a swiveling means 60, which will be described later, is attached to slurry inlet 48.

[0046] As shown in Fig. 2, the slurry storage chamber 47 is formed to extend in the width direction of the rear body 42, and the slurry inlet 48 is formed singly at approximately the center of the rear body 42. As shown in Fig. 4, the lids 12 are attached to both ends of the fitted member 40 in the width direction via sealing members 13, and the slurry storage chamber 47 is closed in the width direction by the lids 12.

[0047] Moreover, the base end side of slurry storage chamber opening 49 is formed as a through passage penetrating from the side wall of slurry storage chamber 47 on the front body 41 side toward front body 41. Moreover, slurry storage chamber opening 49 is formed extending in the tangential direction from the lower end of slurry storage chamber 47, and the tip side is connected to joining path 22 of elongated member 20. In nozzle body 10 according to this embodiment, slurry storage chamber opening 49 and joining path 22 form a slurry joining path 50.

[0048] Among the above components, a protective layer made of urethane rubber or the like is formed on the path through which the slurry passes (the inner wall of slurry storage chamber 47, the inner wall of slurry storage chamber opening 49, etc.) This protective layer prevents the path through which the slurry passes from being abraded by the slurry (particularly granular matter), and it has been confirmed that the existence of this protective layer extends the life of nozzle body 10 by several times.

[0049] As shown in FIG. 4, the slurry storage chamber opening 49 is formed as a long slit in the width direction, and spacer members 51 are attached to both ends of the slurry storage chamber 47 in the width direction to prevent the slurry introduced from the slurry inlet 48 from stagnating in the slurry storage chamber 47.

[0050] As shown in Figures 3 to 5, the swirling means 60 comprises a swirling section main body 60a, a connection portion 61 extending from the swirling section main body 60a toward the slurry inlet 48 and having an outlet portion 64 formed therein, a swirling section 62 formed in the swirling section main body 60a, and an inlet portion 63 continuous with the swirling section 62.

[0051] The swivel body 60a is a block-shaped member, and is formed with a swivel part 62 having a circular cross section that penetrates in the vertical direction. The swivel part 62 includes an annular part 62a that extends in a substantially vertical direction from above the swivel body 60a, and an inclined tapered part 62b that connects the lower end of the annular part 62a to the outlet part 64. As shown in Fig. 5, the swivel part 62 and the outlet part 64 are arranged on substantially concentric circles.

[0052] As shown in Fig. 4, an introduction portion 63 is attached to the side of the swirl portion main body 60a, and a hose for supplying slurry to the introduction portion 63 is attached. The introduction portion 63 is formed on the side of the swirl portion main body 60a so as to be approximately perpendicular to the annular portion 62a of the swirl portion 62. As shown in Fig. 5, the introduction portion 63 is attached so as to extend in the tangential direction of the swirl portion 62. In this way, the introduction portion 63 intersects in a direction approximately perpendicular to the opening direction of the slurry inlet 48 that introduces the slurry into the nozzle body, and the outlet portion 64 is disposed in a direction approximately parallel to the opening direction of the slurry inlet 48.

[0053] In the nozzle body 10 configured in this manner, the slurry introduced into the slurry storage chamber 47 is rotated by the rotating means 60 and stirred within the slurry storage chamber 47, so that the concentration in the slurry storage chamber 47 becomes uniform, and it becomes possible to suppress deterioration in processing quality regardless of the direction in which the nozzle body 10 is used to spray the slurry, for example, in a horizontal direction.

[0054] Furthermore, the nozzle body 10 of this embodiment is arranged so that the inlet portion 63 extends in the tangential direction of the swirling portion 62 of the swirling means 60, and therefore the slurry introduced from the inlet portion 63 is discharged to the outlet portion 64 while being caused to rotate along the inner wall of the swirling portion 62, thereby imparting a reliable swirling motion to the slurry.

[0055] Furthermore, in the nozzle body 10 according to this embodiment, the slurry introduced into the swirling portion 62 is discharged to the discharge portion 64 via the tapered portion 62b, so that the swirling force imparted to the slurry introduced from the tangential direction of the annular portion 62a is not attenuated.

[0056] [Second embodiment] In the nozzle body 10 according to the first embodiment described above, an embodiment in which the spacer members 51 are attached to both ends in the width direction of the slurry storage chamber 47 has been described. Next, a nozzle body 10a according to a second embodiment will be described, which is an example of a slurry storage chamber 47 having a different form from that of the first embodiment. Note that the same reference numerals are used to designate members that are the same as or similar to those in the first embodiment described above, and descriptions thereof will be omitted.

[0057] FIG. 6 is a cross-sectional view corresponding to FIG. 3 of a nozzle body according to a second embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along line DD in FIG.

[0058] As shown in Fig. 6, nozzle body 10a according to this embodiment has a flow path adjusting means (spacer member 70) attached along the inner wall of slurry storage chamber 47. As shown in Fig. 7, spacer member 70 is provided extending in the width direction along the inner wall surface (upper part of slurry storage chamber 47) on the slurry inlet 48 side of slurry storage chamber 47.

[0059] The spacer member 70 is composed of a pair of spacer member pieces 71, 71 extending in opposition to each other toward the center from both end faces of the slurry storage chamber 47. The spacer member pieces 71 are preferably fastened together with the cover body 12 and the seal member 13 of the nozzle body 10a, and the spacer member pieces 71 arranged on the left and right in FIG. 7 preferably have the same shape.

[0060] Spacer piece 71 has a base 71a attached to the side wall of slurry storage chamber 47, and an extension 71b extending from base 71a along the width direction of slurry storage chamber 47. The tips of extensions 71b are arranged so that the tips do not block the opening of slurry inlet 48, and a slope 72 is formed at the end vertically opposite slurry inlet 48, so that a flow path continuing from slurry inlet 48 is formed in a diverging shape.

[0061] 6 and 7, spacer member pieces 71 are provided extending along the width direction of slurry storage chamber 47, but are configured not to block slurry storage chamber opening 49. This prevents the slurry introduced from slurry inlet 48 from stagnating in slurry storage chamber 47, and suppresses a decrease in the flow rate of the slurry. Furthermore, by suppressing a decrease in the flow rate of the slurry, it is possible to improve the uniformity in the width direction of nozzle body 10a even when nozzle body 10a according to this embodiment is arranged facing horizontally and the slurry is projected horizontally.

[0062] [Example] Next, the present invention will be described in more detail with reference to examples. Fig. 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 characteristic of the intensity 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, and Fig. 11 is a graph showing the processing time characteristic of the intensity of the nozzle body according to the second embodiment of the present invention.

[0063] First, the nozzle body 10 according to the first embodiment was placed horizontally, and slurries with concentrations set to 9.1 Vol% and 22.9 Vol% were sprayed using a projection material with a specific gravity of 6, and the processing time until the area coverage, which is the ratio of collision marks at the position in the slit width direction of the slit-shaped injection port, reached 100%, was measured. The test conditions were as follows. Air pressure: 0.40 MPa, slurry pressure: 0.24 MPa. The nozzle body 10 placed horizontally had a width of 60 mm, and the measurement position was placed with the -24 mm side downward and the +24 mm side upward to spray the slurry. The measurement positions were 5 points at 12 mm intervals from the opening end of the injection port.

[0064] In Figure 8, the reason for using the processing time until the area coverage reaches 100% is as follows. The "processing quality / strength" in blast processing is determined by the "energy of the blast material (speed x mass)" x "number of blast material particles (concentration)." Here, if the particle size and specific gravity of the blast material are uniform, the "mass" will be constant.

[0065] Furthermore, the "speed" depends on the pressure and flow rate of the compressed air. In the conventional air flow path structure as described in Patent Documents 1 and 2, the pressure and flow rate are constant across the nozzle width direction, and this structure is also applied to the nozzle body according to this embodiment.

[0066] With conventional nozzle body structures, "concentration," i.e., the amount of projection material in the slurry, is easily affected by gravity, particularly when projecting in the horizontal direction, resulting in differences in concentration 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.

[0067] As mentioned above, "processing time" is the time (projection time) required to obtain a desired processing state / quality (in this case, "100% area coverage"), and is "the time until the same (constant) number of projection material particles with equal (constant) speed collide with the surface of the workpiece."

[0068] In the nozzle body of this embodiment, the "speed" is constant (uniform) across the width of the nozzle, so the "processing time" can be replaced with the "projection material concentration." In reality, the best way to indicate uniformity in the nozzle width direction is to indicate the concentration in the nozzle width direction, but it is difficult to measure local concentration in the nozzle width direction. Therefore, in FIG. 8, the "processing time until area coverage reaches 100%" is used as a value indicating the processing quality / strength.

[0069] As shown in Figure 8, when the nozzle body 10 of this embodiment is projected horizontally, it can be confirmed that the processing time is uniform regardless of the measurement position, and it can be confirmed that the processing variation in the opening direction of the nozzle is reduced compared to the conventional nozzle body as shown in Figure 12.

[0070] As shown in Fig. 9, it was also confirmed that the arc height, which is the height at which the processed surface is stretched by beating, was uniform regardless of the measurement position for the intensity processing time characteristics. The measurement of the intensity processing time characteristics was performed using a blast material (TZ-B250) with a specific gravity of 6 and a concentration of 23.0 Vol%. The spray direction and measurement position of the nozzle body 10 were the same as those for the area coverage measurement described above.

[0071] It has been confirmed that the nozzle body 10 of this embodiment configured in this manner does not degrade the processing quality even when the nozzle body 10 is positioned horizontally and the slurry is sprayed toward the workpiece in a direction other than vertically downward.

[0072] Furthermore, since the nozzle body 10 according to this embodiment is capable of uniformly treating a wide treatment surface, it is suitable for use, for example, in projecting slurry onto a glass surface for pretreatment of transparent roughening.

[0073] Next, the nozzle body 10a according to the second embodiment was placed horizontally, and a slurry with a concentration of 5.7 Vol% was sprayed using a projection material with a specific gravity of 6, and the processing time until the area coverage, which is the ratio of collision marks at the position in the slit width direction of the slit-shaped injection port, reached 100%, was measured. The test conditions were as follows. Air pressure: 0.40 MPa, slurry pressure: 0.24 MPa. The nozzle body 10a placed horizontally was set wider than the nozzle body 10 according to the first embodiment, specifically, the width was 100 mm. The measurement position was set with the -44 mm side downward and the +44 mm side upward, and the slurry was sprayed. The measurement positions were set at five points at 22 mm intervals from the opening end of the injection port.

[0074] As shown in Fig. 10, when the nozzle body 10a according to this embodiment is projected in the horizontal direction, it was confirmed that the processing time is uniform regardless of the measurement position, and that the variation in processing in the opening direction of the injection port is suppressed compared to the conventional nozzle body shown in Fig. 12. Furthermore, with the nozzle body 10 according to the first embodiment, the uniformity may become unstable when the concentration of the projection material is reduced, but with the nozzle body 10a according to this embodiment, it was confirmed that sufficient performance is maintained in terms of uniformity even when the nozzle width is widened or the concentration of the projection material is reduced.

[0075] As shown in Fig. 11, it was also confirmed that the arc height, which is the height at which the processed surface is hammered and stretched, was uniform regardless of the measurement position for the intensity processing time characteristics. The measurement of the intensity processing time characteristics was performed using a blast material (TZ-B250) with a specific gravity of 6 and a concentration of 5.7 Vol%. The spray direction of the nozzle body 10a and the measurement position were the same as those for the area coverage measurement described above.

[0076] It has been confirmed that the nozzle body 10 of the first embodiment and the nozzle body 10a of the second embodiment configured in this manner do not degrade the processing quality even when the nozzle bodies 10, 10a are arranged horizontally and the slurry is sprayed in a direction other than vertically downward toward the workpiece.

[0077] In addition, the nozzle bodies 10 and 10a according to the first and second embodiments have been described as nozzle bodies having a slit-shaped injection port, but the shape of the injection port is not limited to a slit-shaped injection port, and various injection ports may be applied. In addition, the fitted member 40 has been described as having one air inlet 46 and one slurry inlet 48, but the number of air inlets 46 and slurry inlets 48 is not limited to this, and may be increased as appropriate. In this case, the number of swiveling means 60 may be increased according to the number of slurry inlets 48.

[0078] In addition, in the nozzle body 10a according to the second embodiment, the spacer member 70 is attached in the slurry storage chamber 47, but the flow path adjusting means may be formed integrally with the rear body 42 by reducing the volume of the slurry storage chamber 47 and forming the slurry storage chamber 47 in substantially the same shape as when the spacer member 70 is attached. Furthermore, in the nozzle body 10a according to the second embodiment, the slurry is directly introduced into the slurry inlet 48, but the swirling means 60 may be attached to the slurry inlet 48 as in the nozzle body 10 according to the first embodiment. It is clear from the claims that such modified or improved forms are also included in the technical scope of the present invention. [Explanation of symbols]

[0079] 1 wet blasting treatment device, 2 holding part, 5 abrasive material, 10 nozzle body, 11 slit-shaped injection port, 12 cover body, 20 long member, 21 through path, 22 joining path, 23 engagement part, 30 plate-shaped member, 31 passage path, 32 convex part, 33 engaging convex part, 40 fitted member, 41 front body, 42 rear body, 43 air injection passage, 44 protrusion, 45 air storage chamber, 46 air inlet, 47 slurry storage chamber, 48 slurry inlet, 49 slurry storage chamber opening, 50 slurry joining path, 51, 70 spacer member, 60 swivel means, 60a swivel part body, 61 connection part, 62 swivel part, 62a Annular portion, 62b tapered portion, 63 introduction portion, 64 extraction portion, 71 spacer member piece, 71a base portion, 71b extension portion, 72 inclined surface W workpiece.

Claims

1. a nozzle body having a slurry storage chamber into which a slurry obtained by mixing abrasive grains and a liquid is introduced and temporarily stored, an air storage chamber into which pressurized air is introduced and temporarily stored, and a passageway communicating with the slurry storage chamber and the air storage chamber and for ejecting an ejection material obtained by mixing the slurry and the pressurized air from an ejection port, The slurry storage chamber includes a slurry inlet for introducing the slurry, The nozzle body is characterized in that the slurry inlet is provided with a swirling means for swirling the slurry.

2. The nozzle body according to claim 1 , The nozzle body is characterized in that the rotating means includes an inlet portion that introduces the slurry from a direction intersecting the inlet direction of the pressurized air, and an outlet portion that discharges the slurry in the slurry storage chamber in a direction approximately parallel to the inlet direction of the pressurized air.

3. The nozzle body according to claim 2, The nozzle body, wherein the swirling means comprises a swirling body connecting the inlet portion and the outlet portion.

4. The nozzle body according to claim 3, The swivel body is disposed substantially concentrically with the outlet portion, The nozzle body is characterized in that the introduction portion extends in a tangential direction of the swirl portion main body.

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

6. The nozzle body according to claim 5, the slurry storage chamber is provided with a slurry storage chamber opening portion at a lower end along a direction in which the pressurized air is introduced, the slurry storage chamber opening portion being in communication with the injection port and opening in a slit shape along the width direction, A nozzle body characterized in that an inner wall of the slurry storage chamber is provided with a flow path adjustment means whose height in the direction in which the pressurized air is introduced and whose width in the width direction do not overlap with an opening of the slurry storage chamber.

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

8. The nozzle body according to claim 7, The spacer members are attached to both ends of the slurry storage chamber in the width direction, A nozzle body comprising: a base portion attached to a side wall of the slurry storage chamber; and an extension portion extending from the base portion along the width direction.

9. The nozzle body according to claim 8, A nozzle body, characterized in that a tip of the extension portion is formed so as not to overlap with the slurry inlet port and has a slope inclined with respect to a direction in which the slurry is introduced from the slurry inlet port.

10. A wet shot peening method comprising projecting said slurry onto a surface of a workpiece using a nozzle body according to any one of claims 1 to 9.

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