JP7599761B1 - Slurry Projectile - Google Patents

Abstract

To provide a slurry projectile that can achieve 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.
[Selected figure] Figure 3

Description

The present invention relates to a slurry projectile that collides a projectile (e.g., a slurry made of a mixture of abrasive grains and a liquid such as water) against a workpiece to process the surface of the workpiece, and in particular to a slurry projectile that uses an impeller to collide the projectile against the workpiece.

Conventionally, various slurry projectiles have been known as slurry projectiles for removing dirt and burrs from the surface of a workpiece. For example, the slurry projectile described in Patent Document 1 is known as such a slurry projectile, which uses an impeller to project a slurry of a mixture of liquid and abrasive grains onto the workpiece and collide with it, and the collision of the slurry removes dirt and burrs from the workpiece surface.

As shown in FIG. 6, a conventional slurry projector 100 discharges slurry introduced from a slurry inlet 110 through 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. This type of workpiece processing is called wet shot blast processing.

Patent No. 6929579

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 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 roughly fan-like shape centered on the tangential direction of the impeller 120, so that the amount of scraping is greatest at position P1 near the tangential direction of the impeller 120, and the amount of scraping decreases as the position P1 moves away from the impeller 120 in the radial direction (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 abrasion is greatest at the portion of the workpiece W directly below the impeller 120 in FIG. 6, and the amount of abrasion gradually decreases along the vertical direction of the paper surface in FIG. 6.

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

In order to solve the above problems, the present invention provides a slurry projectile comprising an axial member having a slurry discharge hole formed therein, through which a slurry mixture of abrasive grains and liquid is extracted, and an impeller arranged coaxially with the axial member and rotatably arranged around the axis, the slurry being projected as the impeller rotates, and the projected slurry being caused to collide with a workpiece, the slurry discharge hole having a moving means capable of moving in a forward or reverse direction of the rotation direction of the impeller, the axial member having the slurry discharge hole formed at its tip side, a slurry introduction hole for introducing the slurry being formed on the side of the base end side of the slurry discharge hole , and the slurry introduction hole being arranged within a slurry storage chamber in which the slurry is stored .

In addition, in the slurry projectile of the present invention, it is preferable that the impeller has blades formed at a predetermined interval.

In the slurry projector according to the present invention, it is preferable that a plurality of the slurry introduction holes are formed at predetermined intervals along the circumferential direction of the shaft member.

In addition, in the slurry projectile of the present invention, it is preferable that the moving means includes a first motor, and the impeller is rotationally driven by a second motor.

According to the slurry projector of the present invention, the slurry discharge hole arranged on the shaft 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 direction of projection of the slurry can be adjusted, and processing can be made uniform regardless of the position of the workpiece, making it possible to achieve high processing quality.

FIG. 2 is a plan view of a slurry projectile according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. 1 . FIG. 2 is a front view of a slurry projectile according to an embodiment of the present invention. BB cross-sectional view in FIG. FIG. 4 is a diagram showing the amount of scraping of a slurry projectile according to an embodiment of the present invention. FIG. 1 is a front view of a conventional slurry projectile. FIG. 13 is a diagram showing the amount of scraping of a conventional slurry projectile.

Below, preferred embodiments for carrying out the present invention will be described 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.

Figure 1 is a plan view of a slurry projectile according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, Figure 3 is a front view of a slurry projectile according to an embodiment of the present invention, Figure 4 is a cross-sectional view taken along line B-B in Figure 3, and Figure 5 is a diagram showing the amount of scraping of a slurry projectile according to an embodiment of the present invention.

As shown in Figures 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 section, causing the projection material S to collide with the surface, thereby performing surface treatment.

The projection material S is preferably a slurry, which is a mixture of liquid and abrasive grains. The liquid contained in the slurry serves to transport 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.

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

Specific examples of the material of the abrasive grain include ceramics, resin, and metal, and more specific examples include alumina, glass, zirconia, and stainless steel. Examples of the shape of the abrasive grain include polygonal, spherical, and true spherical shapes. The size of the abrasive grain can be appropriately selected from about 1 μm to about 800 μm.

There are no particular limitations on the proportion of abrasive grains in the overall slurry, and it can be designed appropriately depending on the material of the workpiece, the area to be processed, and even the desired degree of processing.

In addition to the liquid and abrasive grains, the slurry can contain mixtures with various functions, for example, rust inhibitors. 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 treatment. 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.

As shown in FIG. 1, the slurry projector 10 according to 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 unit 80 for transporting the work W described below.

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

As shown in FIG. 1, the impeller 20 is rotated by a second motor 50 arranged 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 that is 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.

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

A plurality of slurry introduction holes 32 are formed on the side 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 a predetermined interval 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.

The base end of the shaft member 30 is fitted with a first motor 41 and a reducer 42 constituting the moving means 40, 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, movement direction, and movement distance according to commands from a control unit (not shown). With the shaft member 30 configured in this way, the movement 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.

The first motor 41 is attached to one side wall 61 of the processing chamber 60 and the other side wall 62 that faces it, and the impeller 20 and the shaft member 30 are disposed in the processing chamber 60, protruding from the one side wall 61 and the other side wall 62 that face each other.

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 slurry storage chamber 70 is supplied with the above-mentioned slurry from a slurry storage tank (not shown) by a hose (not shown) attached to a slurry supply port 71 formed on the other side wall 62. As shown in FIG. 4, the slurry storage chamber 70 is provided with the slurry introduction hole 32 of the shaft member 30, and the slurry can be introduced into the inside of the shaft member 30 through the slurry introduction hole 32.

As described above, the processing chamber 60 is a sealed box having one side wall 61 and the other side wall 62 that face each other, and has an opening 63 facing the work transport section 80 located below. Note that, in the slurry projector 10 according to this embodiment, the processing chamber 60 is described as being formed into 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 into a dome shape curved in an arc following the shape of the impeller 20.

The workpiece transport section 80 has multiple 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. In addition, 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.

In the present embodiment, the slurry projector 10 is preferably used with a flat printed circuit board or the like 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.

Next, the operation of the slurry projector 10 according to this embodiment will be explained with reference to FIG.

The slurry projector 10 of this embodiment, like conventional slurry projectors, projects the slurry discharged from the slurry discharge holes 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.

At this time, since the slurry discharge hole 31 can move in the forward and reverse directions relative to the rotation direction of the impeller 20, the discharge angle of the slurry discharged from the slurry discharge hole 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 hole 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 angle of the slurry discharge hole 31. In addition, 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.

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 is 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 for 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.

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

10 Slurry projectile, 20 Impeller, 21 Impeller, 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 Workpiece transport section, 81 Transport roller, 82 Slurry recovery section.

Claims (4)

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