JP5904403B2 - Fluid barrel polishing equipment - Google Patents

Description

  In the present invention, the workpiece, the polishing medium, and the liquid charged in the polishing tank are swirled and flowed by the rotation of a rotating disk in the polishing tank to form a mixed mass and polish the workpiece. The present invention relates to a fluidized barrel polishing apparatus.

  Barrel polishing is conventionally used in the field of surface finishing such as scale removal, deburring, rounding, scratch removal, and gloss finishing. For barrel polishing, a wet fluid barrel polishing apparatus is widely used from the viewpoint of processing efficiency. In barrel polishing by a fluidized barrel polishing apparatus, a workpiece, a polishing medium having polishing ability, water and a polishing aid as necessary are put into a polishing tank having a rotating disk at the bottom (they have been put into the polishing tank). A mass is fluidized by rotating the rotating disk, and the workpiece is polished. As the pulverizing medium, a lump containing abrasive grains generally called media is used, but the abrasive grains themselves may be used (for example, Patent Document 1).

  In a conventional fluid barrel polishing apparatus, for example, as shown in FIG. 1 in Patent Document 2, a liquid drain hole (discharge port) is disposed on a bottom surface portion 12 formed on the lower side of a rotating disk 13. A tube P that forms a discharge path is disposed in the vicinity of the discharge port, and a valve V is disposed in the middle of the discharge path. Polishing was performed with the valve V closed, and when polishing was completed, the on-off valve V was opened and water was discharged from the polishing tank, and then the object to be polished was recovered.

JP 2003-103451 A JP 2008-000833 A

  Since the pipe P is closed by the on-off valve V during polishing, water containing abrasive grains accumulates between the discharge port and the on-off valve V and does not flow. In addition, since the specific gravity of the abrasive grains is larger than that of water, the abrasive grains are settled and accumulated in the pipe body. As a result, the abrasive grains are fixed in the pipe body, so that the pipe body may be closed by the abrasive grains. Further, when a commonly used valve such as a gate valve or a ball valve is used as the valve V, the abrasive grains are caught in the sliding portion, causing a failure. The present invention provides a fluid-type barrel polishing apparatus that can reliably store and discharge water in a polishing tank and has few failures.

  A first invention is a fluid barrel polishing apparatus in which a workpiece put into a polishing tank, a polishing medium, and water are swirled and flowed to polish the workpiece, and the polishing tank includes a side wall portion. A bottom surface provided with a discharge port for discharging the water, and provided with a closing means for opening and closing the discharge port, and a turntable disposed above the bottom surface and rotating about an axis The closing means includes a closing member for closing in the vicinity of the discharge port. By pressing the discharge port with the discharge member, there is no gap between the discharge member and the discharge port, so that the discharge port can be completely closed. When the discharge port is opened after barrel polishing, the pressing of the discharge member may be released. According to the present invention, the discharge port can be closed and opened with a simple structure.

  Moreover, 2nd invention is a fluid-type barrel polishing apparatus as described in 1st invention, Comprising: The said discharge port presses the said closure member on the periphery of opening of the said discharge port by the pressure of compressed air. It is characterized by being closed by. According to the present invention, it is possible to provide a fluid barrel polishing apparatus with fewer failures than a mechanical structure that discharges the discharge port.

  A third invention is the fluid barrel polishing apparatus according to the first or second invention, wherein the opening of the discharge port is circular, and the tip of the closing member has a conical shape, a conical shape It is either trapezoidal or hemispherical. Since the discharge port is circular and the closing member has a conical shape, a truncated cone shape, or a hemispherical shape, the pressing force of the closing member is evenly applied to the discharge port, so the discharge port and the closing member Therefore, the discharge port can be reliably closed. The hemispherical shape here is a concept including a part of a spherical shape (so-called dome shape). Moreover, it is a concept including not only a true sphere but also an ellipsoid. Further, the shape of the closing member is not particularly limited as long as the contact portion between the discharge port and the closing member has a conical shape, a truncated cone shape, or a hemispherical shape. For example, not only a conical shape, a truncated cone shape, and a hemispherical closing member, but also a cylindrical closing member whose tip is either a conical shape, a truncated cone shape, or a hemispherical shape is included.

  According to a fourth aspect of the present invention, in the closing member of the fluid barrel polishing apparatus according to the second or third aspect, a portion that contacts the discharge port is formed of an elastic body. When the discharge port is pressed and closed by the closing member, the elastic body is deformed according to the shape of the discharge port, and the discharge port and the closing member are brought into close contact with each other. As a result, the discharge port can be reliably closed.

  Further, the fifth invention is characterized in that an elastic body is arranged in the vicinity of the discharge port on the side where the closing member is arranged in the fluid barrel polishing apparatus according to the second or third invention. . When the discharge port is pressed and closed by the closing member, the elastic body deforms in accordance with the shape of the closing member, and the discharge port and the closing member come into close contact with each other. As a result, the discharge port can be reliably closed.

  According to a sixth aspect of the present invention, the closing means of the fluid barrel polishing apparatus according to any one of the second and third aspects includes the closing member, a casing that encloses the closing member, And an opening / closing valve connected to the housing via a tubular body, wherein the closing member closes the discharge port by a pressure of compressed air and an internal pressure of the housing. By pressurizing the inside of the housing after pressing, the adhesion between the discharge port and the closing member is further improved, and the discharge port can be closed more reliably.

  According to the present invention, it is possible to provide a fluidized barrel polishing apparatus capable of discharging water without barrel leakage from the discharge port during barrel polishing and without closing the discharge path after barrel polishing. Since the structure of the present invention is simple, it is excellent in maintainability. In addition, there are few discharge path failures.

It is explanatory drawing for demonstrating the conventional barrel polishing apparatus. It is explanatory drawing for demonstrating the fluid barrel grinding | polishing apparatus of this invention. FIG. 2A is a partial cross-sectional view showing the fluid barrel polishing apparatus of the present invention, and FIG. 2B is a cross-sectional view of the main part. It is explanatory drawing for demonstrating the example of a change of a closing member. It is explanatory drawing for demonstrating the example which has arrange | positioned the elastic body to the discharge port.

  An example of a fluidized barrel polishing apparatus in the present invention will be described with reference to the drawings. The vertical and horizontal directions are the directions in the figure unless otherwise specified.

  The polishing tank of the present embodiment includes a cylindrical side wall portion 11, a bottom surface portion 12 that is connected to the side wall portion and closes the bottom portion, and is positioned above the bottom surface portion 12 and between the bottom surface portion 12. And a turntable 13 arranged so as to form a space. Further, a slight gap is formed between the side wall portion 11 and the side wall of the rotating disk 13.

  Rotating means (motor in this embodiment) is connected to the rotating disk 13 via a drive shaft, and the rotating disk 13 can rotate around the axis.

  The bottom surface portion 12 is provided with a circular discharge port D. A closing means 20 is disposed in the vicinity of the discharge port D. The closing means 20 presses the peripheral edge of the opening of the discharge port D to close the discharge port D, the connecting member 23 connected to the bottom of the closing member, and the closing member 21 Transmitting means 22 for transmitting pressure, a connecting member 23 for connecting the closing member and the transmitting means 22, a housing 24 for housing the closing member 21, and closing and opening the housing 24. Open / close valve 25 and a tube body 26 for connecting the casing 24 and the open / close valve 25 to each other. In the present embodiment, a case where compressed air supplied from a compressed air supply source (not shown) is used as the pressing force of the closing member 21 will be described.

  The casing 24 has a cylindrical shape with one end opened and the other end closed, and the opening surface is connected to the bottom surface portion 12 in the vicinity of the discharge port D. A tube body 26 to which the on-off valve 25 is connected is connected to the closing surface side. The on-off valve 25 is not particularly limited as long as the tube body 26 can be closed, but considering that powder such as abrasive grains and cutting powder generated by barrel polishing flows with water after polishing, the powder does not enter the sliding portion. A structure is preferred. In the present embodiment, a pinch valve is connected as the on-off valve 25. The pinch valve has a structure that can be closed and opened by deforming the soft tube. By connecting one end of the soft tube to the tube body 26, powder is transferred to the sliding portion of the on-off valve 25. Since it does not enter, there is no failure due to powder biting.

  A cylindrical closing member 21 having one end formed into a truncated cone shape is accommodated in the housing 24. The closing member 21 is formed of an elastic body (for example, silicon rubber) in order to improve adhesion when contacting the periphery of the opening of the discharge port D. One end face of a cylindrical connecting member 23 having both ends opened is connected to the center of the bottom surface of the closing member 21.

  The transmission means 22 is a tubular body, and the outer diameter of the transmission means 22 is smaller than the inner diameter of the connecting member 23. The transmission means 22 is disposed so as to penetrate the wall surface of the casing 24 and one end of the transmission means 22 fits inside the casing 24. The vicinity of the end face of the transmission means 22 in the housing 24 is arranged vertically so as to be directed toward the center of the discharge port D. The closing member 21 is placed on the end surface so that the transmission means 22 is surrounded by the connecting member 23. The other end of the transmission means 22 is connected to the compressed air supply source (not shown). (See Fig. 2 (B))

  Hereinafter, the closing means 20 will be described in detail according to the barrel polishing procedure.

  First, the opening / closing valve 25 is closed and the tube body 26 is closed. Next, the compressed air supply source is operated to introduce compressed air from one end face of the transmission means 22. The closing member 21 and the connecting member 23 are moved upward along the transmission member 22 by the force of the introduced compressed air, and the periphery of the opening of the discharge port D is pressed by the closing member 21 to be closed. Thus, the transmission member 22 not only transmits a pressing force to the closing member 21, but also plays a role of a guide for reliably moving the closing member 21 in the direction of the discharge port D.

  Further, some compressed air leaks from the gap between the transmission member 22 and the connecting member 23, and the inside of the housing 24 is in a pressurized state. The pressing force of the closing member 21 is further increased by the internal pressure of the housing 24. Since the closing member 21 is formed of an elastic body, it deforms in accordance with the shape of the periphery of the opening of the discharge port D according to the pressing. Therefore, the closing member 21 and the peripheral edge of the opening of the discharge port D are in close contact with each other, and the discharge port D can be more reliably closed. In addition, the whole closure member 21 does not need to be an elastic body, and the vicinity of the position which contacts the periphery of the opening of the discharge port D should just be formed with the elastic body.

  After closing the discharge port D, a predetermined amount of a workpiece, a polishing medium, and water are put into the polishing tank 01. In this embodiment, alumina abrasive grains having an average particle diameter of 63 to 150 μm are used as the polishing medium. However, the medium may be added together in order to increase the polishing power. Further, if necessary, a polishing aid (compound) may be added together. Polishing aids include, for example, water quality adjustment (softening), media cleaning, gloss finish promotion, abrasive and workpiece cutting powder dispersion, workpiece rust prevention, workpiece degreasing, workpiece punching, and the like. Appropriate selection is made according to the purpose, such as suppression of marks and chipping.

  After a predetermined amount of water, work piece, and abrasive grains have been added, the water, the work piece, and the abrasive grains are swirled by rotating the rotating disk 13 by a rotating means (motor M in the embodiment). Fluidized and mixed mass m is formed, and barrel polishing is performed by contact between the objects to be polished or contact between the objects to be polished and the polishing medium.

  After operating for a predetermined time, the rotation of the rotating disk is stopped. After the opening / closing valve 25 is opened to release the internal pressure of the casing 24, the supply of compressed air is stopped. The closing member 21 and the connecting member 23 move downward, and the closing of the discharge port D is released. By releasing the closing of the discharge port D, the water in the polishing tank 01 is discharged from the discharge port D to the outside.

  After draining water, the object to be polished is taken out, and barrel polishing is completed through steps such as washing and drying.

(Example of change)
The shape of the closing member 21 is not particularly limited as long as the discharge port D can be pressed and closed. For example, a cylindrical shape having a triangular pyramid tip as shown in FIG. 3A or a hemispherical shape as shown in FIG.

  When the closing member 21 is formed of a hard material (for example, iron), as shown in FIG. 4, an elastic body such as rubber may be disposed in the vicinity of the discharge port on the side where the closing member is disposed. When a pressing force is applied to the closing member 21, the elastic body can be deformed and brought into close contact with the shape of the closing member 21.

  The pressing force of the closing member 21 is not limited to compressed air. For example, high-pressure water may be introduced from the transmission means, or a mechanical force using a spring or the like may be applied.

  As long as the discharge port D can be sufficiently closed without the internal pressure of the housing 24, the inside of the housing 24 does not have to be in a pressurized state.

  In order to put the inside of the housing 24 into a pressurized state, a pressurizing means may be separately arranged. For example, the inside of the housing 24 can be brought into a pressurized state by connecting a pipe body for introducing compressed air or the like into the housing 24 and sending the compressed air into the housing 24.

  In this embodiment, the case where abrasive grains are used as the polishing medium has been described. However, the present invention can also be applied to a barrel polishing apparatus using a medium as the polishing medium. Since cutting powder or the like of the workpiece is generated by barrel polishing, by using a fluid barrel polishing apparatus according to the structure of the present invention, a valve connected to a discharge port prevents failure due to biting of the cutting powder. Can do.

01 Fluid type barrel polishing apparatus 10 Polishing tank 11 Side wall portion 12 Bottom surface portion 13 Turntable 20 Closing means 21 Closing member 22 Transmission member 23 Connecting member 24 Housing 25 Open / close valve 26 Tube D Discharge port M Motor m Mass P Tube V valve

Claims (4)

A fluid-type barrel polishing apparatus that polishes a workpiece by swirling and flowing the workpiece, polishing medium, and water charged in a polishing tank,
The polishing tank is provided with a side wall portion and a discharge port for discharging the water, and includes a bottom surface portion provided with a closing means for opening and closing the discharge port, and an axial center disposed above the bottom surface portion. A rotating table that rotates around the center,
The closing means includes a housing connected to the bottom surface including the discharge port, and is housed in the housing, and is pressed against the periphery of the opening of the discharge port by the pressure of compressed air and the internal pressure of the housing. A closing member for directly closing the discharge port, a transmitting means for transmitting a pressing force to the closing member, a connecting member for connecting the closing member and the transmitting means, and a tubular body in the casing and an on-off valve which is connected via,
The compressed air is introduced from the transmission means in a state where the open / close valve is closed and the tubular body is closed,
The pressure of the compressed air moves the closing member to press the periphery of the opening of the discharge port,
The internal pressure of the casing further increases the pressing force of the closing member by the casing being pressurized by compressed air leaking from the gap between the transmission member and the connecting member. A fluidized barrel polishing apparatus. The opening of the outlet is circular, the shape of the tip of the closure member is conical, frustoconical, fluidized barrel polishing apparatus according to claim 1, characterized in that either a hemispherical shape. The closure member has a flow-type barrel polishing apparatus according to claim 1 or claim 2 portions in contact with the peripheral edge of the opening of the outlet, characterized by being composed of an elastic material. Fluidized barrel polishing apparatus according to claim 1 or claim 2, characterized in that the elastic member to the peripheral edge of the opening of the outlet in which the closure member contacts are arranged.

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