Slurry projection body

Abstract

To provide a slurry projection body which can achieve high uniformity of processing and higher processing quality regardless of the position of a workpiece even when the processing is performed by projecting slurry with an impeller.SOLUTION: A slurry projection body includes: a shaft member formed with a slurry discharge hole for extracting slurry in which abrasive grains and a liquid are mixed; and an impeller disposed coaxially with the shaft member and disposed so as to be rotatable around an axis. The slurry projection body projects the slurry in conjunction with rotation of the impeller to cause the projected slurry to collide with the workpiece. The slurry discharge hole includes moving means which may move in a normal direction or a reverse direction of a rotation direction of the impeller.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a slurry projectile that processes the surface of a workpiece by colliding a projectile (for example, a slurry made by mixing abrasive grains with a liquid such as water) against the workpiece, and in particular to a slurry projectile that uses an impeller to collide a projectile with the projectile. [Background technology]

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

[0003] 6, a conventional slurry projectile 100 discharges slurry introduced from a slurry inlet 110 from a slurry discharge hole 130, and rotates an impeller 120 with a pulley 140 to which the rotational force of a drive motor (not shown) is transmitted, thereby projecting the slurry discharged from the slurry discharge hole 130 toward a workpiece W transported by a transport means 150. This type of workpiece treatment is called wet shot blasting. [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, with the conventional slurry projector 100, as shown in Figures 6 and 7, the orientation of the slurry discharge holes 130 arranged on the shaft portion of the impeller 120 is fixed, so the angle θ' between the workpiece W and the slurry discharge holes 130 is constant. When the impeller 120 rotates in this state to project the slurry toward the workpiece W, the slurry is projected in a generally fan-shaped pattern centered on the tangential direction of the impeller 120. As a result, the amount of scraping is greatest at position P1 immediately below the tangential direction of the impeller 120, and the amount of scraping decreases as the distance from position P1 increases in the radial direction of the impeller 120 (the horizontal direction of the workpiece W). For this reason, the conventional slurry projector 100 has the problem that the processing uniformity is not consistent depending on the position of the workpiece W, and there is a demand for improving the processing uniformity in order to achieve higher processing quality. That is, in the conventional slurry projectile 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 projectile 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 of the present invention, which solves the above problems, comprises an axial member having a slurry discharge hole formed therein through which a slurry mixed with abrasive grains and liquid is extracted, an impeller arranged coaxially with the axial member and rotatable about said axis, and the slurry is projected as the impeller rotates, causing the projected slurry to collide with a workpiece, and is characterized in that the slurry discharge hole is provided with a moving means which can move in the forward or reverse direction of the rotation direction of the impeller.

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

[0009] In the slurry projectile according to the present invention, it is preferable that the shaft member has the slurry discharge hole formed at the tip end side, and a slurry introduction hole for introducing the slurry formed at the base end side of the slurry discharge hole.

[0010] In addition, in the slurry projectile according to the present invention, it is preferable that the slurry introduction holes are formed at predetermined intervals along the circumferential direction of the shaft member and are arranged in a slurry storage chamber in which the slurry is stored.

[0011] In the slurry projectile 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. [Effects of the Invention]

[0012] According to the slurry projector of the present invention, the slurry discharge hole arranged on the shaft of the impeller is provided with a moving means that can move in the forward or reverse direction of the rotation direction of the impeller, so that the direction of slurry projection can be adjusted, making it possible to achieve uniform processing regardless of the position of the workpiece, and realizing high processing quality. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a plan view of a slurry projectile according to an embodiment of the present invention. [Figure 2] Cross section AA in Figure 1. [Figure 3] FIG. 2 is a front view of a slurry projectile according to an embodiment of the present invention. [Figure 4] BB cross section in FIG. 3. [Figure 5] FIG. 10 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. 10 is a diagram showing the amount of scraping of a conventional slurry projectile. DETAILED DESCRIPTION OF THE INVENTION

[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 not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0015] FIG. 1 is a plan view of a slurry projectile 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 projectile 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 projectile 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 projection material S onto the surface of a workpiece being transported by a workpiece transport unit, causing the projection 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, 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 perspectives 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, so any abrasive grains can be used as long as they can perform this function.

[0019] Specifically, the material of the abrasive grains can be ceramic, resin, metal, etc., and more specifically, alumina, glass, zirconia, stainless steel, etc. The shape of the abrasive grains can be polygonal, spherical, spherical, etc. The size of the abrasive grains can be appropriately selected from about 1 μm to about 800 μm.

[0020] The proportion of abrasive grains contained in the entire slurry is not particularly limited, and can be appropriately designed depending on the material and processing area of ​​the workpiece, as well as the desired degree of processing.

[0021] In addition to the liquid and abrasive grains, the slurry may contain additives with various functions, such as a rust inhibitor. By including a rust inhibitor in the slurry used in the wet shot blasting method, it is possible to impart rust prevention effects to the surface of the workpiece while simultaneously subjecting it to conventional wet shot blasting. Instead of the rust inhibitor, various additives may be added to the slurry to the extent that they do not impair the effects of the other components.

[0022] As shown in FIG. 1, the slurry projector 10 according to this embodiment includes a processing chamber 60 housing an impeller 20 and an axial member 30 arranged coaxially with the impeller 20, a moving means 40 for rotatably holding the axial 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 generally 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 extend radially. The blades 21 are arranged at predetermined intervals, and the slurry projector 10 according to this embodiment has eight blades 21. In addition, the end of the blade 21 on the center side is formed with a slope, which makes it possible to smoothly guide the slurry discharged from the slurry discharge holes 31 (described later) toward the blades 21.

[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 held 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 cylindrical member with a closed end and a bottom, 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 set appropriately 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 approximately 90° intervals.

[0027] A first motor 41 and a reducer 42, which constitute 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 by the first motor 41 in either the forward or reverse direction of the rotation direction of the impeller 20. A servo motor or the like is preferably used as the first motor 41. The first motor 41 controls the slurry discharge holes 31 to move around the axis at any speed, in any direction, and by any distance in accordance with commands from a control unit (not shown). With the shaft member 30 configured in this manner, the slurry discharge holes 31 can move 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 of the processing chamber 60 and the other side wall 62 opposite to it, and the impeller 20 and the shaft member 30 are arranged within the processing chamber 60, protruding from the one opposing side wall 61 and the other opposing side wall 62, respectively, so as to face each other.

[0029] Furthermore, 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) via a hose (not shown) attached to a slurry supply port 71 formed on the other side wall 62. Furthermore, 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 interior of the shaft member 30 through 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 workpiece transport part 80 arranged below. Note that, in the slurry projector 10 according to this embodiment, the processing chamber 60 has been described as being formed in the shape of a cubic box, but the shape of the processing chamber 60 is not limited to this, and for example, the upper part may be formed in the shape of a dome curved in an arc following the shape of the impeller 20.

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

[0032] In the slurry projector 10 according to 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 with 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 conventional slurry projectors, projects slurry discharged from a slurry discharge hole 31 located on 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, because the slurry discharge holes 31 can move forward and backward relative 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 to an angle greater than the angle θ' of a conventional slurry discharge hole to an angle smaller than the angle θ'. This allows the slurry to be projected at multiple angles of the slurry discharge holes 31, making it possible to perform multiple processes (T1 to T4) depending on the angle of the slurry discharge holes 31. Furthermore, since 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, it is also possible to expand the range that can be processed.

[0036] More specifically, by combining the scraping amount T1 resulting from the angle (first angle) of the slurry discharge holes 31 that allows the slurry to be projected to the farthest end L1, the scraping amount T2 resulting from the second angle at which the position of the slurry discharge holes 31 is moved in the positive direction from the first angle, the scraping amount T3 resulting from the conventional angle (third angle) that is moved in the positive direction from the second angle, and the scraping amount T4 resulting from the fourth angle that is 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 the above-mentioned scraping amounts T1 to T4 have been explained in the case where four projections are performed in one processing, but the number of projections can be increased or decreased as appropriate 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 as having eight blades 21 on the impeller 20 and four slurry introduction holes 32 formed in the shaft member 30. However, these numbers can be increased or decreased as appropriate depending on the type of slurry to be projected, the processing conditions, and the like. In addition, while the movement angle of the slurry discharge holes 31 has been described as being moved in four stages from the first angle to the fourth angle, the number of movement angles of the slurry discharge holes 31 can be increased or decreased as appropriate as necessary. In addition, the slurry projector 10 according to this embodiment has been described as performing wet shot blasting on workpieces W transported by the workpiece transport unit 80. However, the slurry projector itself may be moved to perform wet shot blasting on workpieces placed on a table or the like. It is clear from the claims that such modified or improved embodiments are also within 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 Processing 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 extracted; 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 collides with a workpiece, The slurry projectile is characterized in that the slurry discharge hole is provided with a moving means capable of moving in a forward or reverse direction of the rotation direction of the impeller.

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

3. 3. The slurry projectile of claim 2, The shaft member has a slurry discharge hole formed at a tip end thereof, and a slurry introduction hole formed at a base end thereof for introducing the slurry.

4. 4. The slurry projectile of claim 3, The slurry projectile is characterized in that the slurry introduction holes are formed at predetermined intervals along the circumferential direction of the shaft member and are disposed within a slurry storage chamber in which the slurry is stored.

5. 2. The slurry projectile of claim 1, the moving means comprises a first motor; The impeller is rotationally driven by a second motor.

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