Slurry Projectile

Abstract

To provide a slurry projectile capable of realizing high processing uniformity and higher processing quality regardless of the position of a workpiece, even when processing is performed by projecting slurry with an impeller. [Solution] The present invention comprises an axial member having a slurry discharge hole formed therein through which a slurry mixture of abrasive grains and liquid is extracted, an impeller arranged coaxially with the axial member and rotatable around the axis, and a slurry projector through which the slurry is projected as the impeller rotates and which collides the projected slurry against a workpiece, the slurry discharge hole being provided with a moving means capable of moving in either the forward or reverse direction of the rotational direction of the impeller.

Description

[Technical field]

[0001] The present invention relates to a slurry projectile that processes the surface of a workpiece by colliding a projection material (e.g., a slurry mixed with abrasive grains and a liquid such as water) against the workpiece, and more particularly to a slurry projectile that uses an impeller to collide the projection material against the workpiece. [Background technology]

[0002] Conventionally, various types of slurry projectiles have been known as a slurry projectile for removing dirt, burrs, etc. from the surface of a workpiece. For example, a slurry projectile described in Patent Document 1 is known as such a slurry projectile, and this slurry projectile projects a slurry, which is a mixture of liquid and abrasive grains, onto a workpiece by an impeller and causes it to collide with the workpiece, and the dirt, burrs, etc. on the workpiece surface are removed by the collision of this slurry.

[0003] 6, a conventional slurry projector 100 discharges slurry introduced from a slurry inlet 110 from a slurry discharge hole 130, and projects the slurry discharged from the slurry discharge hole 130 toward a workpiece W transported by a transport means 150 by rotating an impeller 120 with a pulley 140 to which the rotational force of a drive motor (not shown) is transmitted. Such processing of the workpiece is called wet shot blast processing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6929579 Summary of the Invention [Problem to be solved by the invention]

[0005] However, according to the conventional slurry projector 100, as shown in Figs. 6 and 7, the orientation of the slurry discharge hole 130 arranged on the shaft of the impeller 120 is fixed, so that the angle θ' between the workpiece W and the slurry discharge hole 130 is constant. When the slurry is projected toward the workpiece W by rotating the impeller 120 in this state, the slurry is projected in a substantially fan-like shape centered on the tangential direction of the impeller 120, so that the amount of scraping is the largest at a position P1 in the vicinity of the tangential direction of the impeller 120, and the amount of scraping decreases as the position P1 moves away from the position P1 toward the radial direction of the impeller 120 (the horizontal direction of the workpiece W). For this reason, the conventional slurry projector 100 has a problem that the uniformity of the processing is not constant depending on the position of the workpiece W, and in order to achieve higher processing quality, it is necessary to improve the uniformity of the processing. That is, in the conventional slurry projector 100, the amount of scraping is greatest at the portion of the workpiece W directly below the impeller 120 in FIG. 6, and the amount of scraping gradually decreases along the vertical direction of the paper surface of FIG.

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide a slurry projector that can achieve high processing uniformity regardless of the position of the workpiece, and achieve higher processing quality, even when processing is performed by projecting slurry using an impeller. [Means for solving the problem]

[0007] The slurry projector according to the present invention for solving the above problems comprises an axial member having a slurry discharge hole formed therein through which a slurry containing a mixture of abrasive grains and liquid is extracted, and an impeller arranged coaxially with the axial member and rotatably arranged about the axis, the slurry is projected as the impeller rotates, and the projected slurry is collided with a workpiece, the slurry discharge hole comprises a moving means capable of moving in a forward or reverse direction of the rotation direction of the impeller, the axial member has the slurry discharge hole formed at its tip side, and a slurry introduction hole for introducing the slurry is formed on a side surface of the base end side of the slurry discharge hole. The slurry introduction hole is disposed in a slurry storage chamber in which the slurry is stored. It is characterized by the above.

[0008] In the slurry projector according to the present invention, it is preferable that the impeller has blades formed at predetermined intervals.

[0010] In the slurry projector according to the present invention, the slurry introduction holes are formed at a predetermined interval along the circumferential direction of the shaft member. Can It is preferable that:

[0011] In the slurry projector according to the present invention, it is preferable that the moving means includes a first motor, and the impeller is rotationally driven by a second motor. Effect of the Invention

[0012] According to the slurry projector of the present invention, the slurry discharge hole arranged on the shaft portion of the impeller is equipped with a moving means that can move in the forward or reverse direction of the rotation direction of the impeller, so that the projection direction of the slurry can be adjusted, processing can be made uniform regardless of the position of the workpiece, and high processing quality can be achieved. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a plan view of a slurry projectile according to an embodiment of the present invention. [Diagram 2] Cross section taken along line AA in FIG. [Diagram 3] FIG. 2 is a front view of a slurry projectile according to an embodiment of the present invention. [Figure 4] Cross-sectional view taken along line B-B in FIG. [Diagram 5] FIG. 4 is a diagram showing the amount of scraping of a slurry projectile according to an embodiment of the present invention. [Figure 6] FIG. 1 is a front view of a conventional slurry projectile. [Figure 7] FIG. 13 is a diagram showing the amount of scraping of a conventional slurry projectile. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] 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.

[0015] FIG. 1 is a plan view of a slurry projector according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a front view of a slurry projector according to an embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line BB in FIG. 3, and FIG. 5 is a diagram showing the amount of scraping of a slurry projector according to an embodiment of the present invention.

[0016] As shown in Figs. 1 to 3, the slurry projector 10 according to this embodiment projects a blast material S onto the surface of a workpiece being transported by a workpiece transport section, causing the blast material S to collide with the surface, thereby performing surface treatment.

[0017] It is preferable to use a slurry, which is a mixture of liquid and abrasive grains, as the blast material S. The liquid contained in the slurry serves to carry the abrasive grains, which will be described later, to the surface of the workpiece. Therefore, as long as it can fulfill this role, any liquid can be used, except for flammable substances. Specifically, it is preferable to use water, from the viewpoints of environmental considerations and cost.

[0018] 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.

[0019] 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, spherical, etc. The size of the abrasive grains may be appropriately selected from about 1 μm to about 800 μm.

[0020] The content ratio of the abrasive grains in the entire slurry is not particularly limited, and can be appropriately designed depending on the material and processing area of ​​the workpiece, and further the desired degree of processing, etc.

[0021] In addition to the liquid and abrasive grains, the slurry may contain admixtures having various functions, for example, a rust inhibitor. By containing a rust inhibitor in the slurry used in the wet shot blasting method, it is possible to impart a rust prevention effect to the surface of the workpiece while subjecting it to a conventional wet shot blasting treatment. Also, instead of the rust inhibitor, various additives may be added to the extent that they do not impair the action and effect of each component.

[0022] As shown in FIG. 1, the slurry projector 10 of this embodiment includes a processing chamber 60 housing an impeller 20 and a shaft member 30 arranged coaxially with the impeller 20, a moving means 40 for rotatably holding the shaft member 30, a second motor 50 for rotating the impeller 20, and a work transport section 80 for transporting the work W described later.

[0023] 2, the impeller 20 has a roughly disk-shaped impeller body 22 and a plurality of blades 21 that stand upright from the side (disk surface) of the impeller body 22 and each of which extends radially. The blades 21 are arranged at predetermined intervals, and the slurry projector 10 according to this embodiment has eight blades 21. In addition, a slope is formed at the end of the blade 21 on the center side, and this slope makes it possible to smoothly guide the slurry discharged from the slurry discharge hole 31 described later to the blade 21 side.

[0024] 1, the impeller 20 is rotationally driven by a second motor 50 disposed adjacent to the processing chamber 60, and the rotational force of the second motor 50 is transmitted to the impeller 20 by a drive belt 51 wound around a first pulley 52 attached to the second motor 50 and a second pulley 53 attached to the impeller 20. The impeller 20 is rotatably supported by a bearing 23 attached to one side wall 61 of the processing chamber 60.

[0025] As shown in Figures 1 to 4, the shaft member 30 is a bottomed cylindrical member whose tip end is closed, and a slurry discharge hole 31 is drilled at the tip end of the side wall, and the slurry discharge hole 31 connects the inside and outside of the shaft member 30.

[0026] A plurality of slurry introduction holes 32 are formed on the side surface of the shaft member 30 closer to the base end than the slurry discharge holes 31 (approximately near the center of the shaft member 30). The slurry introduction holes 32 are formed at predetermined intervals in the circumferential direction of the shaft member 30. The number of slurry introduction holes 32 can be appropriately set depending on the type of slurry to be projected and the amount of scraping of the workpiece W during processing. For example, in the slurry projector 10 according to this embodiment, four slurry introduction holes 32 are formed at intervals of approximately 90°.

[0027] A first motor 41 and a reducer 42 constituting the moving means 40 are attached to the base end of the shaft member 30, and the shaft member 30 is arranged so that it can be rotated in the forward or reverse direction of the rotation direction of the impeller 20 by the first motor 41. A servo motor or the like is preferably used as the first motor 41. The first motor 41 controls the slurry discharge hole 31 to be movable around the axis at any speed, moving direction, and moving distance according to a command from a control unit (not shown). By configuring the shaft member 30 in this way, the moving direction of the slurry discharge hole 31 can be moved in either the forward or reverse direction relative to the rotation direction of the impeller 20.

[0028] The first motor 41 is attached to one side wall 61 and the other side wall 62 opposing the one side wall 61 of the processing chamber 60, and the impeller 20 and the shaft member 30 are arranged within the processing chamber 60, protruding from the opposing one side wall 61 and the other side wall 62, respectively, so as to face each other.

[0029] Further, a slurry storage chamber 70 is formed on the inner surface of the other side wall 62 (the inner wall of the processing chamber 60). The above-mentioned slurry is supplied to the slurry storage chamber 70 from a slurry storage tank (not shown) by a hose (not shown) attached to a slurry supply port 71 formed in the other side wall 62. Further, as shown in Fig. 4, the slurry storage chamber 70 is provided with the slurry introduction hole 32 of the shaft member 30, so that the slurry can be introduced into the inside of the shaft member 30 via the slurry introduction hole 32.

[0030] As described above, the processing chamber 60 is a sealed box having one side wall 61 and the other side wall 62 facing each other, and has an opening 63 facing the work transport part 80 arranged below. In the slurry projector 10 according to this embodiment, the processing chamber 60 is formed in a cubic box shape, but the shape of the processing chamber 60 is not limited to this, and for example, the upper part may be formed in a dome shape curved in an arc shape following the shape of the impeller 20.

[0031] In the work transport section 80, a plurality of transport rollers 81 are rotatably arranged along the transport direction, and the work W is transported on the transport rollers 81 by the rotation of the transport rollers 81. In addition, a slurry collection section 82 is formed directly below the opening 63 of the work transport section 80, and the slurry projected from the slurry collection section 82 is collected.

[0032] In the slurry projector 10 of this embodiment, a flat printed circuit board or the like is preferably used as the workpiece W to be processed, but the workpiece W is not limited to this, and it is also possible to process, for example, rod-shaped members or members of complex shapes.

[0033] Next, the operation of the slurry projector 10 according to this embodiment will be described with reference to FIG.

[0034] The slurry projector 10 of this embodiment, like the conventional slurry projector, projects the slurry discharged from the slurry discharge hole 31 arranged in the shaft portion of the impeller 20 toward the workpiece W by the blade portion 21 of the impeller 20, thereby processing the surface of the workpiece W with a predetermined amount of scraping.

[0035] At this time, since the slurry discharge holes 31 can move in the forward and reverse directions with respect to the rotation direction of the impeller 20, the discharge angle of the slurry discharged from the slurry discharge holes 31 can be changed within the range of angle θ. Therefore, the angle can be set from an angle larger than the angle θ' of the conventional slurry discharge holes to an angle smaller than the angle θ'. This allows the slurry to be projected at the angles of multiple slurry discharge holes 31, making it possible to perform multiple processes (T1 to T4) depending on the angles of the slurry discharge holes 31. Note that the far end L1 of the slurry projection range when the slurry is projected at the largest angle can be positioned farther from the impeller 20 than the far end L2 of the conventional range, making it possible to expand the range that can be processed.

[0036] In more detail, by superimposing the amount of scraping T1 at the angle (first angle) of the slurry discharge hole 31 that can project the slurry to the farthest end L1, the amount of scraping T2 at the second angle at which the position of the slurry discharge hole 31 is moved in the positive direction from the first angle, the amount of scraping T3 at a conventional angle (third angle) moved in the positive direction from the second angle, and the amount of scraping T4 at a fourth angle moved in the positive direction from the third angle, it becomes possible to perform uniform processing regardless of the position of the workpiece W. Note that, although the above-mentioned amounts of scraping T1 to T4 have been described for a case in which four projections are performed in one processing, the number of projections can be appropriately increased or decreased depending on the shape of the workpiece W to be processed and the required processing quality.

[0037] In addition, the slurry projector 10 according to this embodiment has been described with the number of the blades 21 of the impeller 20 being eight, and the number of the slurry introduction holes 32 formed in the shaft member 30 being four, but these numbers can be appropriately increased or decreased depending on the slurry to be projected, the processing conditions, etc. In addition, the case where the movement angle of the slurry discharge hole 31 is moved in four stages from the first angle to the fourth angle has been described, but the number of the movement angles of the slurry discharge hole 31 can be appropriately increased or decreased as necessary. In addition, the slurry projector 10 according to this embodiment has been described with the case where the wet shot blasting process is performed on the work W transported by the work transport part 80, but the wet shot blasting process may be performed by moving the slurry projector itself on the work placed on a table or the like. It is clear from the description of the claims that such modified or improved forms are also included in the technical scope of the present invention. [Explanation of symbols]

[0038] 10 slurry projectile, 20 impeller, 21 blade portion, 22 impeller body, 30 shaft member, 31 slurry discharge hole, 32 slurry introduction hole, 40 moving means, 41 first motor, 50 second motor, 51 drive belt, 52 first pulley, 53 second pulley, 60 treatment chamber, 70 slurry storage chamber, 71 slurry supply port, 80 work transport section, 81 transport roller, 82 slurry recovery section.

Claims

1. a shaft member having a slurry discharge hole formed therein through which a slurry containing abrasive grains and a liquid is discharged; An impeller arranged coaxially with the shaft member and rotatably arranged around the shaft, In a slurry projectile, the slurry is projected as the impeller rotates and the projected slurry is collided with a workpiece, The slurry discharge hole is provided with a moving means capable of moving in a forward or reverse direction of a rotation direction of the impeller, the shaft member has a slurry discharge hole formed on a tip side thereof, and a slurry introduction hole for introducing the slurry formed on a side surface of the slurry discharge hole on a base end side thereof, The slurry projectile is characterized in that the slurry introduction hole is disposed in a slurry storage chamber in which the slurry is stored.

2. 2. The slurry projectile of claim 1, The impeller has blades formed at predetermined intervals.

3. 2. The slurry projectile of claim 1, The slurry projectile is characterized in that a plurality of the slurry introduction holes are formed at predetermined intervals along the circumferential direction of the shaft member.

4. 2. The slurry projectile of claim 1, The moving means includes a first motor; The impeller is driven to rotate by a second motor.

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