Nozzle member and wet blast processing device provided with nozzle member

Abstract

The present invention solves the conventional problems of further improving productivity and achieving uniformity of processing, suppression of workpiece movement, and simplification of conveyance, when performing wet blast processing in which a plurality of workpieces are placed on a tray. Provided is a nozzle member that sprays a slurry which is a mixture of a liquid and abrasive grains toward a member to be processed, said nozzle member comprising a pair of nozzle bodies which each have a slit-shaped spray port that extends in a straight line, wherein in a cross-section orthogonal to the extension direction of the spray ports, the pair of nozzle bodies are disposed opposite each other such that the slurry sprayed from the respective spray ports collides at a given point.

Description

Nozzle member and wet blast processing apparatus including the same

[0001] The present invention relates to a nozzle member that injects a slurry in which abrasive grains and a liquid such as water are mixed onto a workpiece or the like to process the surface of the workpiece, and a wet blast processing apparatus including the nozzle member.

[0002] Conventionally, for the purpose of improving the durability of the cutting edge of a cutting tip used in a cutting tool and also for removing dirt and burrs on the surface of a workpiece, wet blast processing has been performed in which a slurry in which abrasive grains and a liquid such as water are mixed is injected onto the workpiece by compressed air such wet blast processing uses a wet blast processing apparatus including a nozzle member for injecting the slurry, and various forms of such nozzle members and wet blast processing apparatuses are known.

[0003] For example, as described in Patent Document 1, a nozzle member used in a conventional wet blast processing apparatus is a nozzle member provided in a wet blast processing apparatus for injecting a slurry, which is a mixture of a liquid and abrasive grains, together with compressed air onto a workpiece as a processed member. A plurality of nozzle bodies are provided in a main body portion provided at an opposing upper position of the processed member, and these nozzle bodies are provided so that the slurry is inclined and injected downward from the opposing side to a predetermined processed portion of the processed member together with compressed air.

[0004] According to such a nozzle member, there is an effect that the processing ability is high, and thus the processing cost of wet blast processing can be reduced.

[0005] JP-A-2018-202587

[0006] However, while conventional nozzle components offer good uniformity when wet blasting a single workpiece and are highly advantageous against workpiece displacement (hereinafter also referred to as "workpiece jumping") caused by slurry spraying due to the inclined spraying from the opposite side of the workpiece, they suffer from low productivity because each workpiece must be processed individually. Furthermore, while it is conceivable to place multiple workpieces on a tray and wet blast them to increase productivity, such processing methods result in low reliability, deterioration of processing uniformity, the occurrence of workpiece jumping, and increased complexity of transport.

[0007] More specifically, the nozzle member described in Patent Document 1 has eight nozzle bodies that spray slurry in a spot-like manner arranged on a predetermined circumference, and each nozzle body is configured to spray slurry from the opposite side downwards towards the area to be treated. In a wet blasting process using such a nozzle member, the entire surface of the workpiece is treated by reciprocating the nozzle member along the horizontal direction of the workpiece.

[0008] However, if the slurry sprayed from each of the eight nozzles interferes with each other, the abrasive particles contained in the slurry will collide, causing wear on the abrasive particles, and the buffer will reduce processing efficiency. To prevent this, the spray pattern must be arranged in a donut shape on the workpiece mounting surface so that the slurry sprayed from the eight nozzles does not interfere with each other.

[0009] When the slurry is sprayed in a donut shape in this manner, if multiple workpieces are placed on a tray, the slurry spray will spread out to multiple workpieces, resulting in uneven spraying and a structure that is prone to positional errors such as workpieces flying off or rotating. Furthermore, positional errors can lead to uneven slurry spraying on the workpieces, potentially negatively impacting processing uniformity and productivity. To prevent such positional errors, methods such as designing trays with a specific shape for each workpiece could be considered, but such trays would lack versatility for handling a wide variety of workpieces.

[0010] The present invention has been made to solve the above problems, and aims to provide a nozzle member and a wet blasting apparatus equipped with this nozzle member that can further improve productivity even when wet blasting is performed with multiple workpieces placed on a tray, and solve various problems that have existed in the past, such as processing uniformity, suppression of workpiece flying, and simplification of transport.

[0011] The nozzle member according to the present invention, which solves the above problems, is a nozzle member that sprays a slurry, which is a mixture of liquid and abrasive particles, onto a workpiece, wherein the nozzle member has a pair of nozzle bodies having linearly extending slit-shaped injection ports, and the pair of nozzle bodies are arranged opposite each other in a cross section perpendicular to the extending direction of the injection ports, such that the slurry sprayed from the injection ports collides with each other at any point.

[0012] Furthermore, in the nozzle member according to the present invention, it is preferable that the pair of nozzle bodies, in a cross section perpendicular to the extending direction of the injection port, have injection angles of the slurry injected from the injection port that are inclined at 1 to 50° with respect to any given point.

[0013] Furthermore, in the nozzle member according to the present invention, it is preferable that the angular difference between the spray angles of the pair of nozzle bodies is within 5°.

[0014] Furthermore, in the nozzle member according to the present invention, it is preferable that the pair of nozzle bodies are equipped with angle adjustment means that can change the spray angle.

[0015] Furthermore, in the nozzle member according to the present invention, it is preferable that the length of the position where the slurry ejected from each of the pair of nozzle bodies is ejected onto the workpiece, along the opposing direction of the pair of nozzle bodies, is adjustable.

[0016] Furthermore, in the nozzle member according to the present invention, it is preferable that the nozzle member is equipped with a means for reciprocating movement in a direction perpendicular to the extending direction of the injection port.

[0017] Furthermore, the wet blasting apparatus according to the present invention is a wet blasting apparatus equipped with the nozzle members described above, wherein there are two or more nozzle members, and each of the nozzle members is arranged such that the extending directions of the injection ports intersect.

[0018] According to the nozzle member and the wet blasting apparatus equipped with this nozzle member, a pair of nozzle bodies are arranged opposite each other in a cross section perpendicular to the extending direction of the nozzle opening, such that the slurry ejected from the nozzle opening collides with each other at arbitrary points. As a result, the slurry is ejected only onto a predetermined workpiece (hereinafter also referred to as "workpiece") from opposing directions, workpiece displacement such as workpiece flying or rotation is less likely to occur, thereby improving productivity and processing uniformity.

[0019] A schematic diagram of a wet blasting apparatus equipped with a nozzle member according to an embodiment of the present invention. A plan view of the nozzle member according to an embodiment of the present invention. A perspective view showing the nozzle body of the nozzle member according to an embodiment of the present invention. A diagram showing the operation of the nozzle member according to an embodiment of the present invention. A diagram showing the angle adjustment means of the nozzle member according to an embodiment of the present invention. A diagram illustrating a method for adjusting the distance of the nozzle member to the workpiece according to an embodiment of the present invention. A diagram illustrating the transport means of a wet blasting apparatus equipped with a nozzle member according to an embodiment of the present invention. A diagram illustrating wet blasting using the nozzle member according to an embodiment of the present invention. A diagram illustrating wet blasting using the nozzle member according to an embodiment of the present invention. A diagram illustrating the maximum opposing spray width of the slurry using the nozzle member according to an embodiment of the present invention.

[0020] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. Note that the following embodiments are not intended to limit the invention as described in each claim, and not all combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0021] Figure 1 is a schematic diagram of a wet blasting apparatus equipped with a nozzle member according to an embodiment of the present invention; Figure 2 is a plan view of the nozzle member according to an embodiment of the present invention; Figure 3 is a perspective view showing the nozzle body of the nozzle member according to an embodiment of the present invention; Figure 4 is a diagram showing the operation of the nozzle member according to an embodiment of the present invention; Figure 5 is a diagram showing the angle adjustment means of the nozzle member according to an embodiment of the present invention; Figure 6 is a diagram illustrating a method for adjusting the distance of the nozzle member to the workpiece according to an embodiment of the present invention; Figure 7 is a diagram illustrating the transport means of a wet blasting apparatus equipped with a nozzle member according to an embodiment of the present invention; Figures 8 to 10 are diagrams illustrating wet blasting using the nozzle member according to an embodiment of the present invention; and Figure 11 is a diagram illustrating the maximum opposing spray width of the slurry using the nozzle member according to an embodiment of the present invention.

[0022] As shown in Figure 1, the nozzle member 10 according to this embodiment is suitably attached to the wet blasting apparatus 1. The nozzle member 10 sprays the aerosol S onto the surface of the workpiece W being transported by the transport means, causing the aerosol S to collide and perform surface treatment. The sprayed aerosol S is collected by a slurry recovery unit 9 located below the transport means 2, where it is reused after removing foreign matter and so on.

[0023] In this embodiment, the workpiece W subjected to wet blasting is described as a roughly rectangular cutting tip used in cutting tools (see Figure 11). However, the shape of the workpiece W processed by the nozzle member 10 according to this embodiment is not limited to this, and it can be applied to various conventionally known workpieces.

[0024] The propellant S is preferably a slurry, which is a mixture of liquid and abrasive grains, sprayed together with compressed air. The liquid contained in the slurry plays the role of transporting the abrasive grains, described later, to the surface of the workpiece. Therefore, any liquid can be used as long as it can perform this role, except for flammable substances. Specifically, water is preferred due to environmental considerations and cost considerations.

[0025] The abrasive grains are transported to the workpiece surface by the liquid and play the role of performing the desired processing on the workpiece surface. Therefore, any abrasive grains can be used as long as they can perform this role.

[0026] Specifically, abrasive materials can include ceramics, resins, and metals, and more specifically, alumina, glass, zirconia, and stainless steel. Abrasive shapes can include polygonal, spherical, and perfectly spherical shapes. Abrasive grain sizes can be appropriately selected and used, ranging from approximately 1 μm to 500 μm.

[0027] The proportion of abrasive grains in the total slurry is not particularly limited and can be appropriately designed according to the material of the workpiece, the processing area, and the desired degree of processing.

[0028] Furthermore, the slurry can be a mixture of various functional materials in addition to the liquid and abrasive grains mentioned above, and may contain, for example, a rust inhibitor. By including a rust inhibitor in the slurry used in the wet blasting treatment method, it becomes possible to apply a conventional wet blasting treatment to the surface of the workpiece while simultaneously providing a rust-preventive effect. Alternatively, various additives may be added instead of a rust inhibitor, as long as they do not hinder the effects of each component.

[0029] The wet blasting apparatus 1 equipped with the nozzle member 10 according to this embodiment includes a transport means 2 extending in the processing direction, a loader 2a located on the base end side of the transport means 2, a first processing unit 3a, a second processing unit 3b, and an unloader 6, which are respectively arranged along the extending direction of the transport means 2 from the loader 2a.

[0030] As shown in Figure 7, the conveying means 2 extends in a series in the longitudinal direction, and a pair of profiled belts 7, 7, which are arranged at a predetermined interval in the width direction, are wrapped around a drive unit 8 located at the end of the conveying means 2 on the unloader 6 side in the longitudinal direction.

[0031] Furthermore, it is preferable that the workpieces W are arranged vertically and horizontally along the longitudinal and width directions at predetermined intervals on the mounting member T, and the mounting member T is conveyed so as to be stretched between profiled belts 7. For this reason, when the aerosol S is sprayed from above the workpieces W by the first processing unit 3a and the second processing unit 3b described later, in the conventional method in which a conveyor belt is provided below the mounting member T, the aerosol S after wet blasting is likely to hit the conveyor belt and reflect, causing the workpieces W to fly off the mounting member T or rotate. However, according to the structure of the conveying means 2 in this embodiment, there is no belt or the like below the mounting member T to which the aerosol S is reflected, so problems such as the workpieces W flying off or rotating due to the belt or the like do not occur.

[0032] Furthermore, since the mounting member T is transported by the profiled belt 7, in a system where the transport belt is provided below the mounting member T, the belt is divided, and slippage is likely to occur when the mounting member T moves onto the next belt at the divided portion. However, with the structure of the transport means 2 according to this embodiment, it is possible to prevent the mounting member T from slipping on the transport means 2, and a simple transport means 2 structure can be realized without causing a decrease in the uniformity of the wet blasting treatment.

[0033] The drive unit 8 consists of a pulley positioned on the unloader 6 side of the profiled belt 7, and preferably a belt tensioning mechanism is positioned on the loader 2a side. At least the pulley on the unloader 6 side is driven by a motor or the like (not shown). The structure for applying the driving force may be to mount the motor's rotating shaft coaxially with the pulley, or the motor and pulley may be driven via a drive belt or the like.

[0034] The loader 2a and unloader 6 are positioned at the base end and tip end of the conveying means 2 in the conveying direction, respectively, and are used to load the mounting member T on which the workpiece W is placed before processing, and to remove the mounting member T on which the workpiece W has been processed.

[0035] In the first processing unit 3a and the second processing unit 3b, the nozzle member 10 according to this embodiment is arranged to be movable in a predetermined direction. In the first processing unit 3a, the slit-shaped nozzle 22 of the nozzle member 10, which will be described later, is arranged to be aligned with the transport direction of the transport means 2, and moves back and forth along the width direction of the transport means 2 (the opposing directions of the pair of profiled belts 7). In contrast, in the second processing unit 3b, the slit-shaped nozzle 22 of the nozzle member 10 is arranged to be aligned with the width direction of the transport means 2, and moves back and forth along the transport direction of the transport means 2.

[0036] Furthermore, since the same nozzle member 10 is used in both the first processing unit 3a and the second processing unit 3b, the following explanation will focus on the first processing unit 3a, and a detailed explanation of the second processing unit 3b will be omitted.

[0037] As shown in Figure 2, the nozzle member 10 is arranged such that a pair of nozzle bodies 20 are positioned so that the extending directions of the openings of the slit-shaped injection port 22 are parallel to each other, and are held between a pair of angle adjustment means 11 located at both ends of the slit-shaped injection port 22. Above the nozzle member 10 is a moving means 12 to which the angle adjustment means 11 are attached. The moving means 12 holds the nozzle member 10 so that it can reciprocate in a direction perpendicular to the extending direction of the slit-shaped injection port 22 (width direction in the case of the first processing unit 3a, and transport direction in the case of the second processing unit 3b). The moving means 12 can be configured in any way as long as it can move the nozzle member 10 along the width direction or the transport direction, but for example, various conventional actuators such as linear guide devices and ball screws, or conventional moving mechanisms using timing belts can be used. It is preferable that the moving means 12 is equipped with a vertical movement mechanism 15 that can move not only reciprocate but also vertically.

[0038] As shown in Figure 3, the nozzle body 20 sprays the propellant S in a strip from a linearly extending slit-shaped nozzle opening 22. The nozzle body 20 comprises a nozzle body 21 having a slurry inlet 23 for introducing slurry and an air inlet 24 for introducing compressed air, and a slit-shaped nozzle opening 22 that is vertically extended from the nozzle body 21. The slurry and compressed air introduced from the slurry inlet 23 and air inlet 24 are stored in a slurry storage chamber and an air storage chamber inside the nozzle body 21, mixed in an internal passage connecting the slurry storage chamber and the air storage chamber, and then sprayed as propellant S from the slit-shaped nozzle opening 22.

[0039] The angle adjustment means 11 is a plate-shaped member arranged on the side of a pair of nozzle bodies 20, and has an arc-shaped guide groove 13 formed therein. The guide groove 13 has notches 13a and 13b formed at predetermined intervals so that the spray angle of the nozzle body 20, which will be described later, can be adjusted to a predetermined angle. In the nozzle member 10 according to this embodiment, a total of six notches 13a and 13b are formed on one side so that the positions of the notches 13a and 13b can be adjusted to 1°, 10°, 20°, 40°, 45°, and 50°.

[0040] As shown in Figure 4, the pair of nozzle bodies 20 are attached to the angle adjustment means 11 so that they are positioned opposite each other in a cross section perpendicular to the extending direction of the slit-shaped nozzle 22, such that the slurry ejected from the slit-shaped nozzle 22 collides with each other at any point.

[0041] Furthermore, to fix the nozzle body 20 to the angle adjustment means 11, as shown in Figure 5, the fixing pin 14a is loosened, the fixing pin 14a is inserted into any notch 13a of the guide groove 13, and the fixing pin 14b is inserted into the notch 13b, and the fixing pin 14a is tightened to fix the nozzle body 20. At this time, the pair of nozzle bodies 20 are fixed to notches 13a and 13b, respectively, which are formed at positions symmetrical with respect to the vertical direction.

[0042] In this way, by fixing the nozzle body 20 in two places using fixing pins 14a and 14b in fixing holes 25a and 25b, it becomes possible to fix the nozzle body 20 at the desired angle without any displacement.

[0043] Further, the fixing holes 25a and 25b formed in the nozzle body 20 are formed at two locations on the tip side (the slit-shaped injection port 22 side) and the base end side (the slurry inlet 23 side) of the nozzle body 20 as shown in FIGS. 5 and 6. By selecting either the fixing holes 25a or 25b on the tip side or the base end side and inserting the fixing pins 14a and 14b, the distance from the slit-shaped injection port 22 to the work W can be adjusted. The positions where the fixing holes 25a and 25b are formed are not limited to the tip side and the base end side, and three or more locations may be formed. In the nozzle member 10 according to the present embodiment, the case where the fixing pin 14b corresponding to the fixing hole 25b on the tip side is inserted at a position corresponding to a nozzle angle of 20° has been described. For the sake of explanation, the insertion holes of the fixing pin 14b formed in the angle adjusting means 11 are not shown for the insertion holes formed at positions corresponding to other angles other than 20°.

[0044] As described above, the nozzle member 10 according to the present embodiment can adjust the injection distance from the slit-shaped injection port 22 to the work W, so that the force with which the slurry collides with the work W during the wet blasting process can be adjusted.

[0045] Further, the fixing of the nozzle body 20 to the angle adjusting means 11 may be fixed at an arbitrary position on the arc without forming the cutouts 13a and 13b formed in the guide groove 13. In this case, it is preferable that the angle difference between the injection angles of the pair of nozzle bodies 20 is set within 5°. When the angle difference of the injection angle exceeds 5°, it becomes difficult to sufficiently suppress the jumping and rotation of the work described later.

[0046] Also, the adjustment range of the injection angle of the nozzle body 20 is preferably set from 1° to 50° as described above. When the injection angle exceeds 50°, the slurry S injected onto the wall portion for holding the work W formed on the mounting member T interferes, and the processing efficiency decreases. Further, when it exceeds 50°, the force that lifts the work W becomes larger than the force that suppresses the work W described later, so it becomes difficult to reliably suppress the work W.

[0047] Further, in the nozzle member 10 according to the present embodiment, the length along the facing direction of the pair of nozzle bodies 20 at the position where the slurry jetted from each of the pair of nozzle bodies 20 is jetted onto the workpiece W (hereinafter referred to as "facing jet width" in this specification) is changeable. Specifically, the facing jet width can be adjusted by assembling the nozzle body 20 into any notch 13a, 13b formed in the guide groove 13 of the angle adjusting means 11.

[0048] As shown in FIG. 11, it is preferable that the adjustment range of the facing jet width L can be adjusted from 5 mm to the diameter of the maximum inscribed circle C of the workpiece W. Since the facing jet width L can be adjusted within such a range, it is possible to sufficiently suppress the jumping and rotation of the workpiece W described later. When the adjustment width of the facing jet width L is 5 mm or less, the processing efficiency is reduced by the buffer, and the abrasion of the abrasive due to the collision of the jetted slurries S progresses easily. When the facing jet width L exceeds the maximum inscribed circle C, the force for suppressing the jumping and rotation of the workpiece W does not act effectively.

[0049] The adjustment of the facing jet width L can be freely varied by moving the nozzle member 10 itself up and down by the above-described vertical movement mechanism 15. Specifically, by making the vertical movement mechanism 15 vertically controllable by numerical control, it is possible to set a free facing jet width L according to the shape of the workpiece W.

[0050] Next, referring to FIGS. 7 to 10, the operation of the nozzle member 10 according to the present embodiment will be described.

[0051] First, as shown in FIG. 7, wet blasting is performed by jetting slurry onto a plurality of workpieces W placed on the placement member T in the first processing unit 3a. In the first processing unit 3a, the nozzle member 10 performs wet blasting while the slit-shaped jetting port 22 is arranged parallel to the conveyance direction of the conveyance means 2 and moving in the width direction.

[0052] In this embodiment, as shown in Figure 8, the nozzle member 10 located upstream of the workpiece W in the direction of movement sprays slurry onto the upper surface of the workpiece W, while the nozzle member 20 located downstream of the workpiece W (feeding side) wet blasts the cutting surface of the workpiece W.

[0053] The spraying of slurry by the nozzle body 20 on the feeding side generates a force that blows the workpiece W towards the receiving side, and at the same time, the sprayed slurry penetrates the underside of the workpiece W, generating a force that lifts the workpiece W. Due to this blowing force and lifting force, the nozzle body 20 on the feeding side blows or rotates the workpiece W, but the nozzle body 20 on the receiving side sprays slurry onto the upper surface of the workpiece W, suppressing the forces that cause the workpiece W to fly or rotate.

[0054] Furthermore, by moving the nozzle member 10 according to this embodiment, as shown in Figure 9, the nozzle body 20 on the receiving side wet blasts the cutting surface of the workpiece W, and the nozzle body 20 on the feeding side holds down the upper surface of the workpiece W, making it possible to perform wet blasting on the cutting surface while suppressing the flying and rotation of the workpiece W.

[0055] Furthermore, as shown in Figure 10, the nozzle member 10 according to this embodiment allows wet blasting to be performed on multiple workpieces W placed on the mounting member T, and since it can spray only on workpieces W arranged in the spraying direction of the slurry S, it is possible to avoid biased and uneven wet blasting on any workpiece W, achieve a well-controllable spray, and ultimately enable uniform wet blasting to multiple workpieces W.

[0056] Furthermore, since the nozzle member 10 according to this embodiment allows adjustment of the spray angle of the slurry S by the angle adjustment means 11, it is possible to perform wet blasting on the cutting surface of the side surface of the workpiece W, as well as the upper surface of the workpiece W, regardless of the shape of the workpiece W.

[0057] Furthermore, since the nozzle member 10 according to this embodiment can reciprocate along the direction of movement, even if the processes described in Figures 8 and 9 are repeated multiple times, the wet blasting of the cutting surface can be performed to the desired state without causing the workpiece W to jump or rotate, thereby improving processing performance.

[0058] Furthermore, in the second processing unit 3b, the slit-shaped spray nozzle 22 is arranged parallel to the width direction of the transport means 2, and wet blasting is performed while moving in the transport direction. Therefore, wet blasting can be performed on the cutting surface that could not be processed in the first processing unit 3a (the cutting surface in the vertical direction in Figure 10), making it possible to perform wet blasting on the cutting surface over the entire circumference of the workpiece W.

[0059] Furthermore, with respect to the thickness direction of the workpiece W, the nozzle member 10 according to this embodiment can be configured to move vertically, thereby accommodating changes in the thickness of the workpiece W. In this case, the vertical movement mechanism of the nozzle member 10 according to this embodiment can be the vertical movement mechanism 15 described above.

[0060] Furthermore, although the nozzle members 10 in this embodiment have been described in the case where they are arranged in mutually orthogonal directions between the first processing unit 3a and the second processing unit 3b, the number of nozzle members 10 is not limited to two; one or three or more may be arranged. Also, although the nozzle members 10 in this embodiment have been described in the case where wet blasting is performed on a workpiece W conveyed by the conveying means 2, wet blasting may also be performed by moving the nozzle members 10 themselves onto a workpiece W placed on a table or the like. It is clear from the description of the claims that such modified or improved forms may also be included in the technical scope of the present invention.

[0061] 1 Wet blasting apparatus, 2 Conveying means, 2a Loader, 3a First processing unit, 3b Second processing unit, 6 Unloader, 7 Profiled belt, 8 Drive unit, 9 Slurry recovery unit, 10 Nozzle member, 11 Angle adjustment means, 12 Moving means, 13 Guide groove, 13a, 13b Notches, 14a, 14b Fixing pins, 20 Nozzle body, 21 Nozzle body main body, 22 Slit-shaped spray port, 23 Slurry inlet, 24 Air inlet, 25a, 25b Fixing holes, C Maximum inscribed circle, L Opposing spray width, S Slurry, T Mounting member.

Claims

1. A nozzle member for spraying a slurry, which is a mixture of liquid and abrasive particles, onto a workpiece, wherein the nozzle member has a pair of nozzle bodies having linearly extending slit-shaped injection ports, and the pair of nozzle bodies are arranged opposite each other in a cross section perpendicular to the extending direction of the injection ports such that the slurry sprayed from the injection ports collides with each other at any point.

2. The nozzle member according to claim 1, wherein the pair of nozzle bodies are characterized in that, in a cross section perpendicular to the extending direction of the nozzle, the injection angle of the slurry ejected from the nozzle is inclined at 1 to 50° with respect to any given point.

3. The nozzle member according to claim 2, characterized in that the angular difference between the spray angles of the pair of nozzle bodies is within 5°.

4. The nozzle member according to claim 2, wherein the pair of nozzle bodies are provided with angle adjustment means capable of changing the spray angle.

5. The nozzle member according to claim 1, characterized in that the length of the position in the opposing direction of the pair of nozzle bodies at which the slurry ejected from each of the pair of nozzle bodies is ejected onto the workpiece is changeable.

6. The nozzle member according to claim 1, wherein the nozzle member is provided with a means for moving back and forth in a direction perpendicular to the extending direction of the injection port.

7. A wet blasting apparatus comprising the nozzle member described in claim 1, wherein there are two or more nozzle members, and each of the nozzle members is arranged such that the extending directions of the injection ports intersect.

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