JPH0790458B2 - Vibratory barrel polisher barrel tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is to load a workpiece to be polished together with media, compound, water and the like into a barrel tank subjected to forced vibration, and use these as a mass in the tank. The present invention relates to a barrel tank of an oscillating barrel polishing device that swirls and fluidizes a workpiece to polish a workpiece.

[Conventional technology]

Conventionally, a lining material such as polyurethane rubber is generally lined on the inner wall surface of the barrel tank in the above-described vibrating barrel polishing apparatus for cushioning, rust resistance, wear resistance and the like. The surface of this lining material is usually smooth, so that when the work piece is a small part or a thin part, the work piece adheres to the inner wall surface of the barrel tank during processing. As a result, defective products are produced in which only one side is polished or uneven polishing occurs. It is uneconomical to select these defective processed products from the finished products and carry out the polishing process again, since it is wasteful.

Therefore, in order to prevent this, for example, in Japanese Utility Model Publication No. 46-8
As disclosed in Japanese Patent No. 793, the surface of a lining material lined on a rotating peripheral wall surface of a barrel tank or an opposing wall surface that is at a right angle to a vibrating wall surface is formed in an uneven shape, whereby a workpiece is formed. It has been proposed to prevent adhesion to the wall surface.

As another prior art, Japanese Utility Model Publication No. 62-12533 discloses a vertical inner wall surface of a polishing tank in a rotary barrel polishing machine.
It has also been proposed to line a lining member with an uneven portion to prevent the work piece from adhering to the wall surface.

Further, conventionally, regarding the above-mentioned vibrating barrel polishing apparatus, the flow direction of the mass, which is a mixture of the work, the medium, the compound, water, etc., swirls in the circumferential direction of the tank, and the circumferential direction and the longitudinal direction of the tank. It is known that a complex and swirling flow form.

The former uses a box-shaped barrel with both ends closed, while the latter uses a continuous-processing box-shaped barrel with a mass inlet at one end and a mass outlet at the other end. A circular donut-shaped barrel tank and an annular barrel tank in which a pair of opposing linear barrel tanks are connected at both ends are known.

In the latter barrel polishing apparatus, it is necessary to set the mass flow rate with respect to the entire length of the barrel tank to an appropriate value depending on the size of the workpiece, finishing time, lot size or processing line speed. As a method of controlling the flow velocity of this mass, a method of changing the rotation frequency of the motor that vibrates the barrel tank to change the frequency, a method of changing the unbalanced state of the unbalance weight to change the amplitude, As a method of inclining the entire tank in the longitudinal direction, and other methods, as disclosed in Japanese Patent Publication No. 60-14670, a mass propulsion control dam is provided at a predetermined position inside the barrel tank to control the mass flow rate. A control method and the like are known.

[Problems to be Solved by the Invention]

By the way, a vibrating barrel polishing device, particularly a U-shaped or box-shaped barrel tank having an inner circumference of a substantially circular cross-section, is disclosed in the above-mentioned JP-B-46-8793 and JP-B-62-12533, respectively. Even if the disclosed prior art is applied, since the inner peripheral wall surface in the tank which is the swirling flow direction of the mass is a smooth cylindrical surface, when the work piece is a flat thin object or a small article,
A problem that a work adheres to the inner peripheral wall surface is caused, and only one surface is polished or uneven polishing occurs, and a defective processed product is not completely solved.

On the other hand, in a box-shaped barrel tank where continuous processing is performed with a vibrating barrel polishing machine, control of the mass flow rate is an important factor in polishing efficiency.In this case, considering the polishing efficiency, the frequency can be increased. If the amplitude is increased and the polishing efficiency is improved, on the other hand, there is a problem that the flow velocity of the mass in the longitudinal direction of the tank is increased and the overall length of the barrel tank is increased. For example, even if the overall length of the barrel tank can be reduced because the amplitude becomes smaller and the mass flow rate becomes slower, there is a problem that the polishing efficiency is reduced and the polishing process cannot be completed in a short time. When applying the box-shaped barrel tank to actual production, there was a problem that it was difficult to determine the optimum setting conditions when setting the polishing efficiency and the total length of the barrel tank due to the contradictory problems described above.

As a means for controlling the flow rate of the mass in the barrel tank, the method of inclining the whole tank with respect to the longitudinal direction of the barrel tank is effective as described above, but this method has a problem that the apparatus becomes complicated. In addition, as disclosed in Japanese Patent Publication No. 60-14670, in the method of controlling the flow velocity by providing a mass propulsion control dam at a predetermined position inside the barrel tank, the device becomes complicated, and the dam is a work piece. The problem that is triggered is also derived.

The present invention has been proposed to solve the above-mentioned problems, and in a barrel tank applied to a vibrating barrel polishing apparatus, prevents adhesion of a workpiece to the inner wall surface of the tank, improves polishing efficiency, and prevents uneven polishing. It is an object of the present invention to provide a barrel tank which can prevent the generation of the gas and can easily change the mass flow rate.

[Means for Solving the Problems]

In order to achieve this object, the barrel tank of the vibrating barrel polishing apparatus according to the present invention is configured such that a workpiece to be polished is charged together with media, compound, water and the like into a barrel tank to which forced vibration is applied, and swirling and flowing the workpiece. In the barrel tank for polishing a workpiece by means of the above, the barrel apparatus is formed in a vertical cross-section into a substantially circular shape, has a spiral shape having an angle of less than 45 ° with respect to the cylindrical axis of the barrel tank, and has a bottom portion. It is characterized in that a lining material having a groove formed by a concave curve is lined on the entire inner wall surface of the barrel tank. Further, the groove is provided intermittently and has a curvature R at the rising corner of the groove.
It is characterized by being attached.

[Action]

Based on the above configuration, in the present invention, since a long and narrow groove is formed on the entire inner peripheral wall of the barrel tank having a circular vertical cross section, the mass that swirls and flows in the inner circumference of the tank is along the groove. As a result of the flow swirling while receiving the force to move in the direction of the cylinder axis, even if the workpiece is thin or small, the phenomenon of sticking to the wall surface does not occur, and the flow swirls so that it always enters the inside of the mass. As a result, uneven polishing is eliminated.

Further, since the shape of the groove is a spiral shape having an angle smaller than 45 ° with respect to the cylinder axis of the barrel tank, the shape and angle of the groove can be appropriately set within the range so that the mass of the mass can be increased as necessary. The overall length of the barrel tank can be shortened by slowing down the flow rate, and the entire device can be downsized without lowering the processing efficiency of the polishing process. By relining the lining material whose angle is changed appropriately, it becomes possible to change the flow velocity of the mass in the tank to deceleration or acceleration.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show a continuous machining type vibrating barrel polishing apparatus as an embodiment of the present invention. Reference numeral 1 is its machine base, and a coil spring 2 having an appropriate spring constant is provided on the machine base 1.
And the box-shaped barrel tank 3 is supported so that it can freely vibrate. A single rigid shaft 4 is rotatably supported below the box-shaped barrel tank 3 via a plurality of bearings 5.
A plurality of sets of unbalanced weights 6 are fastened and fixed to the shaft 4 in the same phase, and the end of the shaft 4 is connected to a motor 8 outside the barrel tank vibration system via a drive transmission member 7 including a spline shaft and a universal joint. Connected to. A work piece and media supply section 9 is arranged at one end of the barrel tank 8 and a discharge section 10 is arranged at the other end.

The box-shaped barrel tank 3 has a vertical cross section (a cross section perpendicular to the longitudinal direction) that is circular as shown in FIGS. 2 and 3, and the entire inner peripheral wall of the barrel tank 3 has Third
As shown in the figure, a lining material 11 having a spiral groove 12 is lined. The material of the lining material 11 is polyurethane rubber having a Sure hardness of 55 to 88, and the elongated continuous groove 12 is 0 ° <θ ≦ in the longitudinal direction along the axis of the cylinder as shown in FIG. The cross section perpendicular to the longitudinal direction of the groove 12 at an angle θ given by 45 ° is formed in a corrugated groove having a pitch P as shown in FIG.

Next, the operation of the vibrating barrel polishing apparatus configured as described above will be described.

First, the rotational power of the motor 8 drives the shaft 4 via the drive transmission member 7 such as a spline shaft or a universal joint, so that even if the barrel tank 3 makes a three-dimensional motion with respect to the machine base 1, it is smooth. When the shaft 4 rotates, the barrel tank 3 supported by the coil spring 2 is forcibly vibrated by the movement of the unbalance weight 6.

Then, the workpiece and the medium are supplied from the supply unit 9 on one end side of the barrel tank 3, whereby the mass put into the barrel tank 3 swirls and flows in the direction indicated by the arrow A in FIG.

At this time, since the lining material 11 having the spiral groove 12 on the entire inner peripheral wall is lined in the barrel tank 3, the mass swirling and flowing in the barrel tank 3 has an uneven groove on the peripheral wall. The fluid is swirled while receiving a force that moves in the longitudinal direction of the barrel tank 3 (direction of the cylinder axis) along 12, and the workpiece is subjected to a polishing action in the process of this fluid swirl and moved to the other end of the barrel tank 3. Then, the workpiece, which has been polished, is discharged from the discharge unit 10.

Even if the workpiece in the barrel tank 3 is small or thin, since the groove 12 is formed on the entire peripheral surface of the inner wall surface, the workpiece does not adhere to the entire wall surface.

Further, the mass in the box-shaped barrel tank 3 swirls and flows in the circumferential direction of the barrel tank 3 due to the vibration as described above, and at the same time, swirls and drifts in the longitudinal direction on the peripheral wall surface of the barrel tank 3. Since the relative velocity between the mass and the wall surface becomes the flow velocity in the longitudinal direction of the mass, the viscous drag on the wall surface is an important factor.

In this embodiment, a lining material provided with a spiral groove 12 having a predetermined angle θ in the longitudinal direction of the barrel tank 3.
Since 11 is lined, the viscous resistance of the wall surface in the longitudinal direction of the mass increases with the angle θ as compared with the smooth wall surface, and the flow velocity of the mass is slowed. However, although the above-mentioned angle θ was set to 0 ° <θ ≦ 45 ° in the longitudinal direction, the angle θ
If it is set to 45 ° or more, the mass flow is disturbed and the polishing efficiency is lowered, which is not preferable. Further, when the angle of rotation θ is the same as the spiral rotation direction of the mass, the flow velocity increases, which is effective in some cases.

In the above-mentioned embodiment, the corrugated groove is shown as the cross-sectional shape of the groove 12 of the lining material 11. However, as shown in FIG. 6, this is a rounded corner composed of a semicircle having a radius of curvature R1 and a flat surface portion 14. Mold groove 13
The corner may have a radius of curvature R2. Such a shape is more preferable than the one in the previous example in terms of easiness of manufacturing, wearability of the body, flow rate control performance and the like. Further, as a shape similar to this, a rectangular cross-sectional shape in which the groove bottom is also linear is conceivable, but in this case, the medium is clogged in the groove, which is not very advantageous.

The corrugated groove shown in FIG. 5 and the rounded groove 13 shown in FIG. 6 are formed as continuous grooves at a predetermined angle θ as shown in FIG. 7 as the grooves 12 of the lining material 11. If the work piece is a thin work piece and has a rectangular shape with a large aspect ratio, even if there is a groove on the wall surface, there may be a small amount of adhesion, and the groove 15 that takes this into consideration is shown in FIGS. 8 (a) and 8 (b). It is shown in. Ie groove 15
Is the lining material 11 as shown enlarged in FIG. 8 (b).
And has a length L along the longitudinal direction of the groove 15 and a length l along the longitudinal direction of the plane alternately.
The rising corner of the groove 15 has a curvature of R,
The ratio of L to L is set to L: l = 3: 1 to 10: 1.

The operation in this case will be described. When the medium that has entered the groove 15 moves in the circumferential direction of the barrel tank 3, it is extruded to the outside along the R at the end of the groove 15, and the workpiece attached together with this medium is also removed. Since it enters the mass flow again, the function of preventing adhesion is further enhanced. Therefore, the ratio of L and l was made random as shown in FIG. 8 (a) so that some of the thin thin workpieces existed on the flat surface to reduce the probability of adhesion. It goes without saying that the ratio of and may be constant.

In the above example, the vibration barrel polishing apparatus of continuous processing type in the box type barrel tank was described, but a circular donut type barrel tank or a pair of opposing linear barrel tank and semi-circular barrel tank was combined. Needless to say, it can be applied to the annular barrel tank, and the lining material of the above-mentioned embodiment may be appropriately selected so that the workpiece supplied from the supply port finishes the polishing process at the discharge port.

〔The invention's effect〕

As described above, according to the present invention, in the barrel tank having the substantially circular vertical cross section in the vibrating barrel polishing apparatus, the elongated groove is formed on the entire inner peripheral wall of the barrel tank. The mass that swirls and flows around the circumference swirls and flows around the circumferential wall while receiving a force that moves along the groove in the axial direction of the cylindrical axis of the tank.
As a result, even if the workpiece is, for example, a thin one or a small one, the phenomenon that it does not adhere to the wall surface does not occur, and it is possible to eliminate the occurrence of polishing unevenness by constantly swirling the fluid so as to enter the mass.

Further, since the shape of the groove is a spiral shape having an angle smaller than 45 ° with respect to the cylinder axis of the barrel tank, the shape and angle of the groove can be appropriately set within the range so that the mass of the mass can be increased as necessary. The overall length of the barrel tank can be shortened by slowing down the flow rate, and the entire device can be downsized without lowering the processing efficiency of the polishing process. It is possible to change the flow rate of the mass in the tank by reattaching the lining material whose angle is changed appropriately.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment in which a barrel tank according to the present invention is applied to a continuous machining type vibrating barrel polishing apparatus, FIG. 2 is a side view thereof, and FIG. 3 shows a relationship between the barrel tank and a lining material. 4 and 5 are perspective views showing an embodiment of the lining material itself, and FIG. 5 is a BB of the lining material shown in FIG.
6 is an enlarged sectional view taken along the line, FIG. 6 is an enlarged sectional view of another embodiment taken along the line BB of the lining material shown in FIG. 4, and FIG.
The figure is a front view of the developed state showing the form of the groove of the lining material,
FIG. 8 (a) is a front view in a developed state showing another embodiment of the groove of the lining material, and FIG. 8 (b) is a cross section taken along the line CC of FIG. 8 (a). FIG. 1 ... Machine stand, 2 ... Coil spring, 3 ... Barrel tank, 4 ... Shaft, 5 ... Bearing, 6 ... Unbalance weight, 7 ... Drive transmission member, 8 ... Motor, 9 ... Supply port, 10 ... Discharge port, 11 ... Lining material, 12,13,15… grooves.

Claims (2)

[Claims] 1. A barrel tank in which a workpiece to be polished is charged together with media, compound, water and the like into a barrel tank to which forced vibration is applied, and the workpiece is polished by swirling and flowing, said barrel tank Is a vertical cross-sectional shape is formed into a substantially circular shape, a lining material having a groove having a spiral curved shape having an angle of less than 45 ° with respect to the cylindrical axis of the barrel tank and having a concave curve at the bottom, A barrel tank for a vibrating barrel polishing device, which is lined on the entire inner wall surface of the barrel tank. 2. The vibrating barrel polishing apparatus according to claim 1, wherein the groove is provided intermittently, and a rising corner portion of the groove has a curvature R. Barrel tank.