JP4249079B2 - Blasting equipment - Google Patents

Description

  The present invention relates to an improvement of a blasting apparatus.

Japanese Utility Model Publication No. 2-26612

2. Description of the Related Art Conventionally, blasting that can polish a surface of a workpiece by spraying a projection material on the workpiece such as an aluminum die cast part has been widely used.
As an example of an apparatus used for this blasting, there is a device related to the idea described in Patent Document 1 by the applicant of the present application. This apparatus is provided with an annular processing tank on a gantry, and this processing tank is supported by a support spring and is of a vibration swivel type that is vibrated by vibration means. And the workpiece put in the processing tank receives said vibration, and circulates in the processing tank. On the other hand, an injection unit for injecting a projection material such as abrasive grains to the circulating workpiece is provided in the upper part of the treatment tank. When the projecting material sprayed from the spraying unit collides with the surface of the workpiece, the workpiece is deburred and the surface is polished.

  However, the conventional blasting apparatus takes a lot of processing time. This is because the reversal motion of the workpiece generated by receiving the vibration in the treatment tank is not sufficient, and accordingly, it takes a lot of time for blasting.

  This invention makes it a subject to provide the blasting apparatus which can shorten the time which blasting requires in view of this.

In order to solve the above problem, the invention according to claim 1 of the present application is such that the surface of the workpiece W circulated in one direction by the vibration provided by the vibration means 4 is caused by the injected projection material B. In the blasting apparatus to be polished, the cross section is substantially U-shaped, and includes a processing tank 2 in which the workpiece W can be coordinated. An inclined surface 51 is provided so as to rise toward the downstream side in the circulation direction of the workpiece W, so that the concave portion 52a and the convex portion 52b are substantially along the circulation direction of the workpiece W in the processing tank 2. Thus , a blasting apparatus is provided , which is formed by continuously provided ridges 53, and the ridges 53 are covered with an elastic body 2a .

The invention according to claim 2 of the present application is characterized in that the blasting unit according to claim 1 is provided with an injection part 7 for injecting the projection material B above the inclined surface 51. Provide processing equipment.

In the invention according to claim 3 of the present application, the downstream end 22 of the treatment tank 2 in the circulation direction of the workpiece W is provided above the upstream end 21, and the downstream end 22 is It is connected to the upstream end 21 through the dam portion 5 having the inclined surface 51, and the upper end of the inclined surface 51 of the dam portion 5 is arranged at a position higher than the bottom surface of the downstream end 22 of the treatment tank 2. The inclined surface 51 is formed on the upstream side of the dam portion 5 in the circulation direction of the workpiece W, and an injection unit for injecting the projection material B above the inclined surface 51. 7, a first screen 6a for separating the workpiece W, the projection material B, and burrs generated from the workpiece W is provided below the processing tank 2. Furthermore, below that, the projection material B and burrs are separated. Wherein the second screen 6c of order is provided to provide a blasting apparatus according to claim 1.

  In the implementation of the present invention, the inclined surface 51 provided in a part of the processing tank 2 is provided with the concave portion 52a and the convex portion 52b for imparting a reverse motion to the workpiece W. A reverse motion is added to the workpiece W, and the surface of the workpiece W is polished more effectively than the conventional blasting apparatus without the inclined surface 51. Thereby, the time required for blasting can be shortened, and the processing cost of the workpiece W can be reduced.

  Hereinafter, an example of an embodiment of the present invention will be described based on the drawings. 1 and 2 are schematic views showing the blasting apparatus of this example, and FIGS. 3 and 4 are diagrams for explaining a dam part in this example.

  As shown in FIGS. 1 and 2, the blasting apparatus in this example is one in which a processing tank 2 is supported on a gantry 1 by a support spring 3, and this processing tank 2 includes a known vibration such as a vibration motor. A vibration swivel type to which vibration is given by means 4 is used. The treatment tank 2 is an annular one having a substantially U-shaped cross section so that the workpiece W can be coordinated therein, and the upper part is open. In addition, a lid is appropriately attached to the opened upper part as necessary. The substantially U-shape described above is not limited to a shape with a curved bottom surface, but includes a flat surface. However, as described later, the workpiece W is effectively provided with a rotating / stirring motion. For this purpose, a curved surface is desirable.

The vibration means 4 generates vibrations in the horizontal plane by upper and lower eccentric rotating bodies 4a and 4b having different phases around the vertical axis, for example, and at the same time, the workpiece W in the processing tank 2 vibrates. As shown in FIG. 1 and FIG. 2, the inside of the tank is circulated in one direction while being spirally rotated and stirred.
In addition, the descriptions of “upstream” and “downstream” in the following description are based on the circulation direction of the workpiece W in the processing tank 2 with a dam portion 5 described later as a boundary.

The processing tank 2 in this example is provided with a dam portion 5. The upstream end 21 and the downstream end 22 of the processing tank 2 are connected by the dam portion 5, and the workpiece W circulates from the upstream end 21 to the downstream end 22, passes over the dam portion 5 and returns to the upstream end 21. Make exercise. The downstream end 22 of the treatment tank 2 is located above the upstream end 21, and the upper end of the dam portion 5 (the upper end of an inclined surface 51 described later) is higher than the bottom surface of the downstream end 22.
A discharge port 6 is opened at the lower portion of the dam portion 5 on the upstream end 21 side, and the discharge port 6 is used to separate the workpiece W, the projection material B, and burrs generated from the workpiece W. The first screen 6a is arranged. A hopper 6b is attached to the discharge port 6, and a second screen 6c for separating the projection material B and burrs is disposed in the middle of the hopper 6b. The discharge port 6 d of the hopper 6 b is connected to the projection material circulation hose 7 a of the injection means 7.

Here, in the treatment tank 2 of this example, as shown in FIGS. 1 and 3, a dam portion 23 is provided that protrudes from the bottom surface on the downstream side of the discharge port 6 in the direction intersecting the circulation direction of the workpiece W. In the vicinity of the discharge port 6, the workpiece W is temporarily retained and then circulated over the dam portion 23.
Specifically, by providing this dam portion 23, as shown in FIG. 3B, the workpiece W is brought into contact with the dam portion 23 to circulate the workpiece W in the treatment tank 2. By blocking, the workpiece W stays upstream from the dam portion 23 and is pushed out by the workpiece W supplied over the dam portion 5. It is possible to circulate a part of the bridge over the weir 23 and downstream.

  The dam portion 23 has a protruding height from the bottom surface of the treatment tank 2 that is the height between the upper end of the dam portion 5 (inclined surface 51) and the bottom surface of the upstream end 21 of the treatment tank 2, which is the lower end of the dam portion 5. It is desirable that the slope of the rising surface 23a of the dam portion 23 is larger than the slope of the inclined surface 51. In this example, as shown in FIG. 3A, the dam portion 23 is continuously formed so as to be substantially along the radial direction of the processing tank 2, and the protrusion height from the bottom surface of the processing tank 2 Is about 15 mm, and the width of the workpiece W in the circulation direction is about 30 mm. Further, the rising from the bottom surface of the processing tank 2 is substantially vertical. In this example, the dam portion 23 is continuously provided as described above. However, if the workpiece W can be retained as described above, the protrusions extend in the direction intersecting the circulation direction of the workpiece W. It may be provided intermittently. Further, it may be provided in double or triple in the circulation direction of the workpiece W, and can be implemented in various forms.

  The workpiece W retained by the dam portion 23 formed as described above undergoes a natural swirling motion due to the collision with the workpiece W that falls one after another over the dam portion 5. . Thereby, the projection material B adhering to the workpiece W is screened off, and the projection material B can be efficiently recovered to the discharge port 6. Further, due to the collision between the workpieces W caused by the above-described spiral motion, removal of burrs and polishing of the surface of the workpiece W are also performed in this portion. Further, as will be described later, in the case where the injection nozzle 7c 'is also provided above this portion, it is possible to perform more efficient polishing in combination with this spiral motion.

  The first screen 6 a is provided with a large number of slits with an interval of about 1 cm, and is arranged below the dam portion 5 of the processing tank 2. The size of the slit is changed according to the size of the workpiece W. The slit is used so that the workpiece W can be smoothly transferred without clogging the slit. However, the slit can be changed to a mesh screen. The second screen 6c is a wire mesh having a smaller mesh size than the first screen 6a.

In this example, an inclined surface 51 is provided at a portion closer to the upstream side of the dam portion 5 so as to rise toward the downstream side. That is, the downstream end 22 of the processing tank 2 is connected to the upstream end 21 via the inclined surface 51.
The inclined surface 51 is provided with a concave portion 52a and a convex portion 52b for imparting a reverse motion to the workpiece W. In this example, as shown in FIG. 3 (A), the concave portions 52a and the convex portions 52b are continuously provided so as to be substantially along the circulation direction of the workpiece W in the processing tank 2. As shown in FIG. 4B, the ridge 53 is covered with the elastic body 2a.

Specifically, as shown in FIG. 4A, a substantially triangular projection 54 is provided so as to protrude from the bottom surface of the processing tank 2. The upper surface of the protrusion 54 is an inclined surface 51, and is configured to rise as it goes downstream. In addition, although the inclined surface 51 in this example is a flat surface in order to facilitate the processing of the inclined surface itself, it may be a curved surface.
A ridge 53 is provided on the inclined surface 51 formed as described above. In this example, the ridge 53 is formed by arranging a plurality of rod-like bodies 53a and 53b having a circular cross section, and in that state, the rod-like bodies 53a and 53b are disposed on the inner surface of the treatment tank 2, Rubber lining is given as elastic body 2a. In addition, although the thickness of the rubber lining in this example is 10 mm, it can be variously changed according to the kind of workpiece.

  In this example, synthetic rubber is used as the material of the elastic body 2a. However, compared to the case where the elastic body 2a is not covered with the concave portion 52a and the convex portion 52b, the elastic body 2a is relatively formed with respect to the workpiece W. Other materials may be used as long as they have an effect of giving a large reversal motion. For example, a synthetic resin, FRP, or a net-like metal or a thin metal plate may be stacked, and various materials having the above-described action may be employed. Further, the method of covering the elastic body 2a is not limited to the lining method as in this example, and the elastic body 2a may be attached to the inclined portion 51 with an attachment fitting such as an adhesive or a screw.

  In this example, the rod-like bodies 53a and 53b are provided such that the longitudinal direction thereof is substantially along the circulation direction of the workpiece W, as shown in FIG. And in the rod-shaped bodies arranged in this way, a portion protruding upward becomes a convex portion 52b, and a portion between the rod-shaped bodies becomes a concave portion 52a. In this example, the rod-shaped body 53b coordinated at the center portion of the inclined surface 51 is smaller in diameter than the rod-shaped body 53a coordinated at both end portions. That is, the protrusion 53 in the central portion is smaller than both end portions in the inclined surface 51, and the workpiece W existing on the inclined surface 51 can be brought closer to the central portion.

  In addition, the form of the recessed part 52a and the convex part 52b is not limited to the thing of this example. For example, it is good also as what arranged the rod-shaped body of the same diameter. Further, a rod-shaped body having a semicircular cross section or a polygonal shape such as a trapezoid may be used. Further, by forming the inclined surface 51 part by press working or the like, the ridges 52b are formed integrally from the beginning, or conversely, only the ridges are formed, and the ridges are formed in the recesses 52a. It is good also considering the convex part 52b other than the part in which the groove was formed. Further, the recesses 52a and the protrusions 52b are not limited to those provided substantially along the circulation direction of the workpiece W as in this example, and may be provided intermittently. Further, the angle of the inclined surface 51 and the sizes of the concave portion 52a and the convex portion 52b depend on the size of the workpiece W and the time required for polishing the surface of the workpiece W by the injection means 7 described later. Therefore, it can be set as appropriate.

  As described above, since the concave portion 52a and the convex portion 52b are formed in the inclined portion 51, the workpiece W given the rotation / stirring motion by the vibration means 4 has the concave portion 52a having elasticity by the covering of the elastic body 2a. Alternatively, by colliding with the convex portion 52b, the workpiece W passing through the inclined portion 51 is subjected to a reversal motion as indicated by arrows in FIGS. 4 (A) and 4 (B). By applying this reversal motion, each workpiece W rotates about three times as compared with the conventional blasting apparatus without the inclined surface 51. By this rotational motion, the surface of the workpiece W is polished more effectively by the injection means 7 described later. As for this, for example, the processing that took about 30 minutes in the conventional blasting apparatus can be achieved in about 5 minutes in the blasting apparatus of this example, and the processing time is greatly shortened, and evenly. It can be finished and is very advantageous in terms of processing cost.

Next, in this example, as shown in FIGS. 1 and 2, an injection unit 7 for injecting the projection material B is provided above the inclined surface 51.
One end of the projection material circulation hose 7a in the injection means 7 is connected to the discharge port 6d of the hopper 6b, and the other end is connected to the injection nozzle 7c. A hose 7b for compressed air is connected to the injection nozzle 7c, and the projection material B is injected from the injection nozzle 7c together with the compressed air, and the surface of the workpiece W is polished by the collision of the projection material B. This compressed air is supplied by a known means such as a compressor (not shown). In addition, it may replace with injection by compressed air like this example, and it is good also as what injects the projection material B by means, such as an impeller unit.
In addition to the injection nozzle 7c above the inclined surface 51, as shown by a dotted line in FIG. 1, the upstream end 21 of the processing tank 2, that is, above the portion where the workpiece W exceeds the dam portion 5 is provided. Alternatively, an injection nozzle 7c ′ may be provided, and the surface of the workpiece W may be polished at this portion.
Note that it is desirable to provide a dust cover 8 and a dust collector (not shown) in order to prevent dust, small burrs, and broken shots that are generated by spraying from being scattered. Further, an automatic steam injection device or a humidifying water spray device may be connected to the projection material circulation hose 7a.

Next, the usage method of the blasting apparatus of this example is demonstrated.
(1) Put the workpiece W into the processing tank 2 and operate it.
(2) The workpiece W in the processing tank 2 circulates while rotating spirally in the tank while receiving vibration.
(3) The workpiece W to be circulated reaches the inclined surface 51 and ascends the inclined surface 51. At this time, a reverse motion is applied to the workpiece W by the concave portions 52 a and the convex portions 52 b provided on the inclined surface 51.
(4) When the inclined surface 51 is lifted, the projection material B is injected from the injection nozzle 7 c disposed above the inclined portion 51. As the projection material B, shot, grit, sand, abrasive grains, or the like is used. The projection material B circulates through the hopper 6b, the projection material circulation hose 7a, and the like.
(5) The workpiece W rises up to the upper end of the inclined surface 51, and the workpiece W and the like exceeding the dam portion 5 falls on the first screen 6a. At this time, the weir part 23 provided in the processing tank 2 causes the workpiece W to move in a spiral manner as described above. Thereby, the projection material B adhering to the workpiece W is screened off, and the projection material B can be efficiently recovered to the discharge port 6. Further, removal of burrs from the workpiece W, polishing of the surface, and the like are performed. Further, when the injection nozzle 7c ′ is provided above this portion, it is possible to perform more efficient polishing in combination with the spiral motion.
(6) On the first screen 6a, the burrs of the workpiece W and the projection material B pass and go to the second screen 6c. The workpiece W repeats circulation in the treatment tank 2.
(7) On the second screen 6c, the projection material B passes and goes to the projection material circulation hose 7a, and the burrs are filtered on the second screen 6c. In addition, since the 2nd screen 6c is distribute | arranged in the hopper 6b and is being fixed to the processing tank 2, it vibrates with the vibration of the processing tank 2, and can perform effective filtration.
(8) The projection material B that has entered the projection material circulation hose 7a is sent again to the injection nozzle 7c, and is injected from the injection nozzle 7c together with the compressed air.

  Examples of the workpiece W used in the blasting apparatus according to the present invention include various metal small parts such as zinc and aluminum die-casting. In particular, small parts made of magnesium alloy, which are frequently used for bodies such as mobile phones and PDAs recently, are also suitable for the blasting apparatus according to the present invention. Further, the blasting apparatus according to the present invention can be used in various applications such as satin processing of various metals, scale removal after quenching, gloss processing, and peening processing.

It is the schematic of a partially cutaway perspective view which shows the blast processing apparatus of this example. It is the schematic which shows the blast processing apparatus of this example. (A) is a schematic plan view which shows the dam part in this example, (B) is a schematic side view which shows the dam part in this example. (A) (B) is explanatory drawing which showed the behavior of the to-be-processed object in a dam part, (A) is based on a side view, (B) is based on AA cross section of FIG. 3 (A). It is.

Explanation of symbols

2 treatment tank 21 upstream end of treatment tank 22 downstream end of treatment tank 4 vibration means 5 dam part 51 inclined surface 52a recessed part 52b convex part 53 convex line 6a first screen 6c second screen 7 injection part B projecting material W work piece

Claims (3)

In the blast processing apparatus in which the surface of the workpiece (W) circulated in one direction is polished by the sprayed projection material (B) by the vibration given by the vibration means (4),
The cross section is substantially U-shaped, and includes a processing tank (2) in which the workpiece (W) can be coordinated,
A part of the treatment tank (2) is provided with an inclined surface (51) that rises toward the downstream side in the circulation direction of the workpiece (W),
The inclined surface (51) is provided with a concave portion (52a) and a convex portion (52b) for imparting a reverse motion to the workpiece (W) ,
Said recessed part (52a) and convex part (52b) are formed of the protruding item | line (53) provided continuously so that it might follow the circulation direction of the to-be-processed object (W) in a processing tank (2). A blasting apparatus characterized in that the ridge (53) is covered with an elastic body (2a) . The blasting apparatus according to claim 1 , wherein an injection part (7) for injecting the projection material (B) is provided above the inclined surface (51). A downstream end (22) of the processing tank (2) in the circulation direction of the workpiece (W) is provided above the upstream end (21), and
The downstream end (22) is connected to the upstream end (21) via the dam portion (5) having the inclined surface (51), and the upper end of the dam portion (5) on the inclined surface (51) is It is coordinated at a position higher than the bottom surface at the downstream end (22) of the treatment tank (2),
The inclined surface (51) is formed on the upstream side of the dam part (5) in the circulation direction of the workpiece (W),
An injection means (7) for injecting the projection material (B) is provided above the inclined surface (51),
A first screen (6a) for separating the workpiece (W), the projection material (B), and burrs generated from the workpiece (W) is provided below the processing tank (2). And
2. The blasting apparatus according to claim 1 , further comprising a second screen (6 c) for separating the projection material (B) and the burr.

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