JPS6243827B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention has an upwardly opening barrel tank at its center, which is charged with a predetermined amount of mass (abrasive material and workpiece, or contents of abrasive material and workpiece plus water, compound, etc.). The barrel tank is tilted inward so that its axis intersects with the extension line of the vertical main axis of the turret, and the barrel is rotated around the main axis of the turret and rotated around the center axis of the barrel tank so that the mass moves around the outer circumference of the rotation trajectory of the barrel tank. This relates to a deburring method in which burrs are removed from the workpiece by the relative movement between the workpiece and abrasive material in the mass by raising the workpiece at an appropriate angle using centrifugal force and sliding the entire mass. .

Conventionally, the centrifugal barrel processing method has been widely used due to its high polishing efficiency, but the amount of fluid in the barrel tank is only 20 to 25% of the total mass. This centrifugal barrel processing method usually uses a polygonal barrel tank with a pentagonal or octagonal column shape, and an appropriate amount of mass is charged into this tank and rotated in a high-speed planetary rotation, as shown in Figures 1 and 2. The mass (inclined line portion) is pressed against the inner circumferential wall of the barrel tank by centrifugal force near the outer circumference of the turning locus 23, and only the upper part of the mass (21 in Fig. 2) in contact with the inner space of the barrel tank is caused to flow. Process. To achieve this condition, it is usually 100 to 300/√ per minute.
A turning speed of 2 revolutions (rpm) (R is the orbital radius in meters) is required, which is particularly unsuitable for deburring, as the burrs may bend and stick to the workpiece during processing, making it impossible to completely remove the burrs. There was a defect that was difficult to repair.

However, according to this invention, a predetermined amount of mass (normally 20 to 40 of the barrel tank capacity) is inserted into the upper opening barrel tank.
%), and the center axis of the barrel is always intersected at one point with the extension line of the vertical main axis of the turret, at an angle of 30° to 90°, optimally 45° to 65° with respect to the horizontal plane. Tilt inward (α in Figure 3)
burrs are removed from the workpiece by the relative movement between the workpiece and the abrasive material by making the barrel tank revolve around the main axis of the turret and rotate around the center axis of the barrel tank so that the entire mass slides at the same time. I'll do what I do.
The turning speed at which the barrel tank revolves around the main axis of the turret is determined by the turning radius of the barrel tank (in Fig. 3, the turret is rotated from a point P' that hangs down from the upper end of the central shaft 9 fixed to the barrel tank 8 and intersects with the turret). When R (unit: m) is the distance to the center point P of As shown in Fig. 3, the angle is 20° to 60° with respect to the horizontal plane (β degrees in Fig. 3), and the optimum angle is 35° to 45°. Therefore, the mass in the barrel tank is the fourth
As shown by arrow 22 in the figure, all parts slide at the same time, which improves the efficiency of deburring by double that of the conventional method, and also eliminates the possibility of the burr sticking to the workpiece due to bending, which eliminates the defects of the conventional method. This is something that could be improved all at once. Furthermore, since it is a barrel tank with an opening at the top and the mass does not leak out from the opening even without a lid, it has many advantages such as eliminating the need to attach and remove the lid, which was the bottleneck of the conventional centrifugal barrel processing method. It is.

The details of the apparatus for carrying out the present invention will now be described with reference to the accompanying drawings.
FIG. 5 shows an embodiment of the invention. A vertical main shaft 3 is inserted into a bearing 2 mounted on a frame 1, and a turret 4 is fixed to the upper end thereof. Bearings 5 are mounted on this turret 4 at equal intervals around the main shaft 3.
is attached, a connecting shaft 6 is inserted, and its upper end is connected to the lower end of a central shaft 9 which passes through a bearing 7 and has a barrel tank 8 fixed to its upper end by a universal joint 10. A bolt 13 that engages in a long hole 12 provided in a bracket 11 fixed to the turret 4 is attached to the bearing 7, and is locked with a nut 14 to adjust the angle of inclination of the barrel tank 8. On the other hand, a sprocket or booley 15 is fixed to the lower end of the connecting shaft 6, and is interlocked with a sprocket or booley 16 fixed to the bearing 2 via a chain or belt 17. The turret 4 is rotated via a motor 18, a pulley 19, and a belt 20. The motor 18 is preferably of a variable speed type.

Based on the above configuration, the polishing operation will be described as follows: A predetermined amount of mass is charged into the upper opening barrel tank 8 which is inclined at a predetermined angle inside the turret 4.
Drive the motor 18 to rotate the turret 4,
The barrel tank 8 revolves around the main shaft 3. The direction of this rotation is with respect to arrow a, the connecting shaft 6 rotates in the direction of arrow b, and the central axis 9 of the barrel tank 8 rotates in the direction of arrow c (for example, the sprocket or boolean If the diameters of 15 and 16 are the same, the ratio n/N between the number of rotations n and the number of revolutions N can be set to -1.) Due to this rotation of the barrel tank 8,
A centrifugal force is applied to the mass in the barrel tank, and the top surface of the mass rises and inclines toward the orbit of the outer circumference of the barrel tank 8 at a predetermined angle with respect to the horizontal plane. This mass rises due to centrifugal force, and the angle that the top surface of the mass makes with the horizontal plane is 20° to 60°, optimally 35° to 45°.
Implemented as ゜. If the rising angle of this mass exceeds 60°, a fluidized bed will be formed on the top surface of the mass, which will reduce the deburring effect.If the rising angle is less than 20°, there will be almost no centrifugal force, and the deburring efficiency will drastically decrease. do. Therefore, in order to make the entire mass slide evenly, the optimum angle is 35° to 45°. Such a turning speed is selected from within the range of 80 to 30/√2 (rpm), where R (unit: m) is the turning radius of the barrel tank. This enables internal sliding of the entire mass, making it possible to remove burrs protruding from the workpiece surface approximately twice as fast as conventional fluidized polishing using a centrifugal barrel. This eliminates the problem of sticking to the workpiece body due to bending of the cracked beam due to the defect. When the deburring is completed, the workpiece is taken out from the opening 23 to complete one process. Note that this deburring method is not limited to the above embodiment. Further, as for the shape of the barrel vessel in which the method of the present invention is carried out, in addition to the prismatic shape a as shown in FIG. 6, a cylindrical shape b, a spherical shape c, or a bottle shape having a rectangular shape d to a circular shape e can be used.

As described above, according to the present invention, a predetermined amount of mass is charged into a barrel tank having an opening at the top, and the central axis of the barrel tank intersects with the extension line of the vertical main axis of the turret. The turret is tilted inward and outward within 30° to 90°, optimally 45° to 65°, relative to the horizontal plane, revolves around the main axis of the turret, and rotates around the central axis of the barrel tank, and the mass inside the barrel tank is rises due to centrifugal force, and the angle between the top surface of the mass and the horizontal plane is set at 20° to 60°, optimally 35° to 45°, so not only the top surface of the mass slides, but the entire mass slides at the same time. Compared to the conventional centrifugal barrel processing method in which fluid flows only in the fluidized bed on the top surface of the mass, the deburring efficiency is doubled, and sticking defects due to bending of the burr are eliminated, and the upper part is opened. This system has the advantage that the mass will not leak out even in a barrel tank in which there is no need to attach or remove the lid, which is the problem with conventional centrifugal barrels.

[Brief explanation of the drawing]

Fig. 1 is a simplified diagram showing the conventional centrifugal barrel processing method, Fig. 2 is a plan view showing the mass flow state in the barrel tank in the conventional centrifugal barrel processing method, and Fig. 3 is a simplified diagram showing the deburring processing method of the present invention. FIG. 4 is a plan view showing the sliding state of the mass inside the barrel tank in the deburring process of the present invention, FIG. 5 is a front view of the apparatus for carrying out the present invention, and FIG. FIG. 3 is a perspective view of barrel tanks of various shapes used in the invention. 1... Frame, 2... Bearing, 3... Main shaft, 4...
...Turret, 5...Bearing, 6...Connection shaft, 7
...Bearing, 8...Top-opening barrel tank, 9...
Central axis, 10...Universal joint, 11
... Bracket, 12 ... Long hole, 13 ... Bolt, 14 ... Nut, 15, 16 ... Boley or chain wheel, 17 ... Belt or chain, 18 ...
Motor, 19...Booley, 20...Belt,
21...Arrow (flow on the top surface of the mass), 22...Arrow (sliding of the entire mass) 23...Turning trajectory of the centrifugal barrel.

Claims (1)

[Scope of Claims] 1. In a deburring method in which a workpiece and an abrasive material are slid in the barrel by rotating and revolving the barrel to remove burrs from the workpiece, A predetermined amount of mass (abrasive material and workpiece, or contents of abrasive material and workpiece plus water and compound) is charged into a barrel tank with an opening, and the central axis of the barrel tank is perpendicular to the turret. The upper part of the barrel tank is inclined inward so that the angle of inclination of the center axis of the barrel tank to the plane of the turret is within 30° to 90° so as to intersect the extension line of the main axis, and the mass inside the barrel tank is The rotational speed of the main shaft is selected so that the extension line of the upper surface of the mass that rises near the outer periphery of the rotation locus of the barrel tank by receiving the centrifugal force generated by rotation forms an appropriate angle with the horizontal plane. A barrel tank revolves around the main axis of the turret, and the barrel tank rotates around the center axis of the barrel tank, and the resulting relative movement between the workpiece in the barrel tank and the abrasive material removes burrs from the workpiece. A deburring processing method characterized by the removal of burrs. 2 The rotation speed at which the barrel tank revolves around the main axis of the turret is 80 to 30/√2 (rotations/min) when the turning radius of the barrel tank is R (unit: m).
A deburring method according to claim 1, characterized in that the deburring method is within the range of . 3 When the mass in the barrel tank receives centrifugal force, the extension line of the top surface of the mass that rises near the outer periphery of the rotation trajectory of the barrel tank makes an angle of 20° to 60° with respect to the horizontal plane, optimally 35° to 45°. 2. The deburring method according to claim 1, wherein the entire mass is simultaneously slid in a barrel tank. 4. The deburring method according to claim 1, wherein the angle of inclination of the central axis is optimally set at 45° to 65°.