JPS5828461A - Barrel machining unit and barrel machining method - Google Patents

Abstract

PURPOSE:To improve machining efficiency without deteriorating the surface roughness of a product by providing a cylinder-shaped movable frame on a rotary base, which is designed to rotate around a vertical rotating center line and housing a medium and a workpiece within the movable frame and grinding the workpiece. CONSTITUTION:A rotary base 18, which is fastened to the upper end of a rotary shaft 24, is installed at a level near the bottom 12 of a stationary vessel 10. The rotary shaft 24 is rotated by a motor 28 through a polley 26 and a belt 32. A movable cylinder 40 as a movable frame is fastened in such a way that the opening of the cylinder may face in vertical direction. A piston rod 44 of a cylinder 42 is fixed to the outside wall of the cylinder 40. This construction makes it possible to move the cylinder 40 in a radius direction under the state where a constant distance is allowed between the opening's lower end 48 and the rotary base 18. When the cylinder 40 and the rotary base 18 are made concentric by operating the cylinder 42, media 50 are flowing comparatively slowly, thereby improving the surface roughness of the workpiece 52.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a palercar one-boiler apparatus that performs polishing by charging a workpiece and media into a barrel tank equipped with a cylindrical member and a rotary disk rotated at the bottom of the cylindrical member. and a barrel processing method.

One type of barrel processing device is a so-called fluidized barrel processing device. This barrel processing device includes a vertical barrel tank consisting of a cylindrical member and a rotary disk that closes a lower opening of the cylindrical member and is rotatably arranged, and the rotary disk is rotated relative to the cylindrical member. It is configured to flow the media in the barrel tank and polish the workpieces mixed in the media.

Such barrel machining equipment is characterized by high polishing efficiency, but when polishing under conditions that do not deteriorate the surface roughness of the workpiece, it is necessary to select media with low machining efficiency or to reduce the rotation speed of the rotating bottom. The surface roughness of the workpiece must be maintained by lowering the polishing surface, which has the disadvantage of reducing polishing efficiency and impairing its characteristics.

In other words, as shown in Fig. 1, there is a relationship in which the surface roughness of the workpiece after barrel machining deteriorates as the weight loss of the workpiece, which represents polishing efficiency, increases, and conventional barrel machining equipment The processing conditions for barrel polishing, that is, the rotational speed of the rotating running part and the media, were selected within a range that could maintain the surface roughness of the workpiece, taking into account the conflicting conditions.

As a measure to increase the efficiency of barrel machining without deteriorating the surface roughness of the workpiece, we have developed a barrel machining device for rough grinding wheels with high polishing efficiency, and the surface roughness of the workpiece polished by this barrel machining device for rough grinding wheels. It is conceivable to provide the processing line with a barrel processing device for finishing polishing. but,
Although such a measure certainly shortens the processing time, it has the disadvantage that two processing devices and their installation space are required, making the equipment large and expensive.

Against the background of the above circumstances, the present invention provides a barrel machining device that can freely change machining efficiency or surface roughness within a certain range, and a barrel machining device that uses the barrel machining device to produce products with surface roughness without sacrificing machining efficiency. This was done with the aim of providing a barrel processing method that improves the accuracy.

The first invention relates to a barrel processing device, and its gist is that a cylindrical movable frame is placed on a rotary disk that is rotated around a substantially vertical rotation center line in a stationary tank, and the lower end opening of the rotary disk is placed on a rotary disk that is rotated around a substantially vertical rotation center line in a stationary tank. The movable frame is disposed close to the upper surface and movable in the radial direction of the rotary disk so that media and a workpiece can be loaded into the movable frame and the workpiece can be polished.

The second invention relates to a barrel processing method, and the gist thereof is as follows:
Media and workpieces are loaded into a cylindrical movable frame that is movable in the radial direction of a rotary disk that is rotated around a substantially vertical rotation center line in a static tank. When performing polishing, the movable frame is eccentric to the rotary disk, and a relatively large circumferential speed at the periphery of the rotary disk causes intense flow in the media to perform rough machining. , reduce the amount of eccentricity,
Alternatively, the movable frame is made concentric with the rotary disk, and finishing processing is performed by causing a relatively gentle flow in the media using a relatively small circumferential velocity at the center of the rotary disk.

That is, in the device according to the present invention, the cylindrical movable frame plays the role of the cylindrical member in the conventional device, and the cylindrical member and the rotary disk, which were always arranged concentrically in the past, can be made eccentric at will. That's what I did. Therefore, when machining efficiency is the main focus, if the movable frame is made largely eccentric with respect to the rotary disk, the media within the movable frame will be violently flowed by the relatively high circumferential velocity around the rotary disk, resulting in high Machining efficiency can be obtained, and when the main objective is to improve surface roughness, if the eccentricity is reduced to a small value or zero, a gentle flow of the media can be obtained and a good surface roughness can be obtained. It is.

Taking this one step further, first, the movable frame is made largely eccentric to efficiently deburr, and after rough machining such as rounding of edges is performed, the movable frame is moved to the center of the rotary disk and finishing machining is performed. , it is possible to achieve an improvement in processing efficiency without deteriorating the surface roughness of the finished product, and this is a particular feature of the barrel processing method according to the present invention.

Embodiments of the present invention will be described in detail below based on the drawings.

In FIG. 2, the stationary tank 10 is configured with a cylindrical side wall part 11 and a bottom part 12 so as to be able to contain a compound solution 18, etc.
It is fixed on a frame 16 provided in the. Bottom plate 1
A disk-shaped rotary disk 18 is disposed near the upper surface of the base plate 14, and is supported vertically by a bearing 20 on the base plate 14 and fixed to the upper end of a rotary shaft 24 passing through the bottom plate 12. 22 is a sealing device. V-pulley 26 and base plate 1 fixed at an intermediate position of rotating shaft 24
■Pulley 80 of the output shaft of motor 28 fixed to
They are connected by a belt 32, and the turntable 18 is rotated by a motor 28.

Moreover, as shown in FIG. 3, on the upper end surface of the stationary tank 1o,
A pair of guide bars 36 are suspended horizontally.

Each guide bar 36 is provided at a symmetrical position with respect to the rotation center line of the rotary disk 18, and is arranged parallel to each other along with φ. A support member 38 is slidably fitted into each guide bar 36, and a movable cylinder 40 serving as a movable frame is arranged between the surface support members 38 with openings at both ends facing in the vertical direction. Fixed. And still tank 1o
Piston rod 4 of cylinder 42 fixed to the outer wall surface of
4 penetrates a hole provided in the still tank 10 and connects it to the still tank 10.
The movable cylinder 40 protrudes horizontally into the movable cylinder 40, and its tip end is fixed to the outer wall surface 46 of the movable cylinder 40. As a result, the movable cylinder 4
0 can move in the radial direction on the rotary disk 18 with a lower open end 48 having a certain gap between it and the rotary disk 18, and by this movable cylinder 40 and the rotary disk 18, substantially A typical barrel tank is formed.

Hereinafter, a method for performing barrel processing using the apparatus configured as described above will be explained.

First, as shown in FIG. 4 or FIG. 5, the movable cylinder 40 is placed in a position largely eccentric with respect to the rotary disk 18, and the media 50 and the workpiece 52 are charged into the movable cylinder 40, and the static tank 10 is The media 50 inside the movable cylinder 40
and the workpiece 52 are immersed in the funbound solution 1.
3 and rotate the rotary disk 18. Then, the media 50 and the workpiece 52 mixed therein flow in the direction of arrow A in FIGS. 4 and 5, and the media 50 flows into the fourth
A fluidized bed having a cross section shown by the dashed-dotted line in FIG. 5 is formed. However, the cross-sectional shape of this fluidized bed shows the shape of the highest part for convenience, and does not show the shape at the illustrated position.

In the state where the movable cylinder 40 is largely eccentric with respect to the rotary disk 18 as described above, the media 50 on the rotary disk 18 is affected by the tangential force based on the relatively large circumferential speed of the peripheral portion of the rotary disk 18. The movable cylinder 4o is moved by the resultant force of the centrifugal force and
The liquid is moved at high speed to the lower part of the inner wall surface of the fluidized bed, then pushed upward along the inner wall surface, and when it reaches the upper end of the fluidized bed, it slides down toward the inner circumference, creating a violent fluid motion. In other words, the greater the distance from the center of rotation of the rotary disk 18, the greater the tangential force and centrifugal force acting on the media 5o, and the greater the resultant force, which causes the media 5o to flow violently. As a result, the workpiece 5 mixed with the media 50
2 is subjected to strong abrasive action, and rough machining such as deburring and edge round machining quickly progresses.

However, in this state, the surface roughness is not good, so if it is necessary to improve the surface roughness, finishing is performed.

That is, if the cylinder 42 is operated to reduce the eccentricity of the movable cylinder 40 with respect to the rotary disk 18, or if the movable cylinder 4o and the rotary disk 18 are made concentric as shown in FIG.
Media 5o will flow relatively slowly,
The surface roughness of the workpiece 52 can be improved.

As described above, according to the apparatus and method of this embodiment, it is possible to perform finishing machining continuously following efficient rough machining, so it is possible to improve the surface roughness of the product without sacrificing machining efficiency. can be improved. Moreover, compared to the case where rough machining and finishing machining are performed using separate devices, there is an advantage that the workpiece 52 is not required to be taken out and replaced with another device after rough machining.

Furthermore, in the apparatus of this embodiment, by adjusting the eccentricity of the movable cylinder 4o, it is possible to increase the machining efficiency to the maximum that satisfies the requirements for the surface roughness of the workpiece 52.

Furthermore, it is also possible to select either rough machining or finishing machining and perform it professionally. That is, when machining efficiency is the main objective, the amount of eccentricity of the movable cylinder 4o can be increased, and when the main objective is to improve the surface roughness, the eccentricity can be reduced to zero. As shown in FIGS. 4 and 5, if the movable cylinder 40 is occasionally eccentrically eccentric to the rotation center of the rotary disk 18 in the opposite direction,
The flow position of the media 5o on the inner wall surface of the movable cylinder 4o is changed, and uneven wear of the inner wall surface can be avoided. If we go one step further and perform barrel processing by moving the movable cylinder 4o back and forth to both sides of the rotation center of the rotary disk I8,
The flow state of the media 5o within the movable cylinder 40 changes moment by moment, making it possible to uniformly polish even a workpiece with a complicated shape.

Above, we have shown some variations of how to use the device.
The structure can also be modified. For example, a plurality of movable frames such as movable cylinders 40 may be provided on one rotary disk,
Instead of the cylinder 42 in the embodiments of FIGS. 2 to 5, it is also possible to move the movable frame by a motor or by a manually rotated feed screw.

Further, as shown in FIG. 3, by making it possible to change the mounting position of the movable cylinder 4o supported by the support member 88 in the circumferential direction of the movable cylinder 40, the inner wall surface of the movable cylinder 4o is biased by the media 5o. Abrasion can be avoided.

It is also possible to arrange a plurality of sets of movable frames and rotating disks in one stationary tank.

Several embodiments of the present invention have been described above, but
It goes without saying that the present invention is not limited to these embodiments in any way, and may be implemented with various improvements, changes, etc. without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing general characteristics of barrel processing. Second
The figure is a front sectional view showing a state in which the movable cylinder 40 is moved to a position concentric with the rotary disk 18 in an apparatus according to an embodiment of the present invention. FIG. 3 is a top view of the embodiment apparatus of FIG. 2 with the pace plate 14, motor 28, etc. omitted. 4 and 5 are cross-sectional views showing a state in which the movable cylinder 40 is eccentrically moved in opposite directions in the apparatus according to the embodiment shown in FIG. 2. 10: Stationary tank 18: Rotating disk 36: Guide par 38: Support member 40: Movable cylinder (movable frame) 4
2 Niji Linda 50: Media 52: Work Applicant Toyota Motor Corporation D1 Figure 2

Claims (2)

[Claims] (1) A cylindrical movable frame is placed on a rotary disk that is rotated around a substantially vertical rotation center line in a stationary tank, with its lower end opening close to the top surface of the rotary disk, and the radius of the rotary disk is 1. A barrel machining device, characterized in that the barrel machining device is disposed so as to be movable in a direction, and a media and a workpiece can be loaded into the movable frame to polish the workpiece. (2) Media and workpieces are placed in a cylindrical movable frame that is movable in the radial direction of the rotary disk on a rotary disk that is rotated around a nearly vertical rotation center line in a static tank. When loading the media and performing polishing, the movable frame is eccentric to the rotary disk, and a relatively large circumferential velocity at the periphery of the rotary disk causes a strong flow in the media to perform rough machining. After that, the amount of eccentricity is reduced, or the movable frame is made concentric with the rotary disk, so that a relatively small circumferential velocity at the center of the rotary disk causes a relatively gentle flow in the media. A barrel processing method characterized by performing finishing processing.