JPH06285764A - Internal polishing device for cylindrical workpiece - Google Patents

Abstract

PURPOSE:To enhance the workability and to automate the working of a cylindrical workpiece by attaching a cover to only a lower opening in the cylindrical workpiece, and by attaching the workpiece with the use of a fastening device mounted on a turret through one-touch manipulation. CONSTITUTION:A fixed hydraulic cylinder 20 gives vertical motion to the center shaft 18 of a cylindrical workpiece 14a rotatably held between upper and lower turrets, and accordingly, the cylindrical workpiece 14a is fastened and released by this vertical motion. An upward facing cover 28 is fixed to the lower end of the center shaft 18 of the cylindrical workpiece 14a so that a lower opening in the cylindrical workpiece is covered with and fastened by the cover 28 during descent of a piston rod 22. In order to stop the turrets at a predetermined position, a position limit plates in the number equal to the number of rotary shafts are attached around one of the upper and lower turrets. A position limit knock is fitted in a recess formed in each of the position limit plates so as to stop the turrets at a predetermined position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner surface polishing apparatus which is suitable for automatically processing the inner surface of a cylindrical workpiece and is particularly suitable for polishing the inner surface of an aluminum wheel mounted on an automobile or the like.

[0002]

2. Description of the Related Art In a conventional inner surface polishing apparatus, is a cylindrical work piece directly mounted on a turret by a bolt or the like?
No. 10400) or via a holder attached to the turret (Actual No. 53-127686).

[0003]

As described above, since the cylindrical work piece is directly attached to the turret with a bolt or the like or is attached via a holder, the attachment is very troublesome and the automation is difficult. There was a problem.

[0004]

SUMMARY OF THE INVENTION However, the present invention succeeds in polishing the inner surface of the workpiece by rotating and revolving the workpiece by sealingly supporting the workpiece from above and below, barreling the inside and enclosing the abrasive. However, the above-mentioned conventional problems have been solved.

That is, according to the present invention, a cylindrical work having a polishing stone inserted therein is rotatably installed between two turrets, and the turret is rotated at a high speed to cause the cylindrical work to revolve and rotate. In a centrifugal flow barrel processing machine for machining the inner surface of a cylindrical workpiece, a lower lid that covers the opening of the cylindrical workpiece is attached to the lower opening of the cylindrical workpiece to rotate the cylindrical workpiece downward. A tubular shape characterized in that a saucer is fixed to a shaft, an upper lid is fixed to an upper rotating shaft, and a tightening device for tightening a workpiece between the saucer and the upper lid is attached to the turret. It is an inner surface polishing device for a workpiece.

According to another invention, a cylindrical work having a polishing stone inserted therein is rotatably installed between two turrets, and the turret is rotated at a high speed to revolve and rotate on the cylindrical work. In a centrifugal flow barrel machining machine for machining the inner surface of a cylindrical workpiece, a lid is attached to each of the upper and lower openings of the cylindrical workpiece, and the upper and lower rotating shafts for rotating the cylindrical workpiece respectively receive a saucer. Is attached to the turret, and the inner surface of the turret is fixed to the turret.

Next, the invention of a tightening device is a device for tightening a cylindrical work, wherein the lower part has a double shaft and is rotatably borne by an outer hollow shaft. The rotating shaft of the cylindrical work is the hollow shaft. Is slidably inserted inside, and a fluid pressure cylinder for raising and lowering is provided on the upper part, and the lower end of the piston rod of the fluid pressure cylinder is formed in a box shape, and the tip of the rotating shaft of the cylindrical work is formed. The boxes are rotatably connected to each other, and the box-shaped portion at the lower end of the piston rod is non-rotatably and vertically movable by a rotation stopper from the outside. In another invention, a lid is attached to each opening at both ends, and a cylindrical workpiece having a polishing stone inserted therein is rotatably placed horizontally on a pair of rotatable rollers, and at least the pair of rollers is provided. An inner surface polishing apparatus for a cylindrical workpiece, characterized in that a rotary power is connected to one side.

Since the present invention is configured as described above, the mounting of the workpiece, the loading of the grinding stone, and the sealing can all be automated, and the beginning of full automation is opened.

For the upper and lower lids, for example, polyurethane moldings or iron plates with rubber linings are used.

[0010]

According to the present invention, since the lid is attached only to the lower opening of the tubular work and the tightening device attached to the turret allows the tubular work to be attached with one touch, workability is improved. It has become much better and automation is possible.

In another aspect of the invention, lids are attached to the upper and lower openings of the tubular work, and the tubular work is attached to the turret by a tightening device attached to the turret, so that water leaks and bubbles can be prevented. The risk of gushing is small.

In another invention, a cylindrical work having a lid attached to each of the upper and lower openings is placed on a pair of rollers, and the inner surface is easily polished by rotating the cylindrical work. It is also possible to automate it.

[0013]

Embodiment 1 FIGS. 1 and 2 are external views of a device of the present invention with a loading / unloading device added. A central shaft 2 is rotatably attached to a frame 1 of a processing machine main body, and an outer shaft 3 that rotates together with the central shaft 2 is fitted and installed below the central shaft 2.
The upper turret 4 and the lower turret 5 are fixed at a predetermined interval so that they can rotate together with the outer shaft 3.

The rotation of the outer shaft 3 is carried out by the sprocket wheel 58 and the chain 59 of the main electric motor 6 by transmitting the rotation to the main sprocket wheel 7. Above the main sprocket wheel 7, a chain wheel casing 8 that supports the central shaft 2 is fixed in the frame 1, and chain wheels 9a and 9b are fixed to the chain wheel casing 8. The number of chain wheels 9a and 9b is the same as the number of rotation shafts described later, and the number is the same, but in FIG. 1, it is two, and the number of rotation shafts is six. Therefore, the structure is such that one chain wheel 9a rotates three rotation shafts. Any number of rotation shafts can be attached to one machine, but if it is an even number, it is convenient because the loading and unloading positions are on the same diameter extension as shown in Fig. 1, so it is usually an even number. To use.

The rotating shafts 10a, 10b are supported by the lower turret 5 so that they can rotate with respect to the lower turret 5.
Chain wheel 1 for rotation attached to the lower end of 0c ...
1a, 11b, 11c ... and the chain wheel 9 described above
The chains 60 are used to transmit a and 9b. The ratio of the number of teeth of both chain wheels 9a and 9b determines the ratio between the revolution number and the revolution number of the workpiece mounted on the rotation shaft. For example, if the number of teeth of the chain wheels 9a and 9b is p and the number of teeth of the chain wheel for processing tank rotation is q, the rotation of the rotation axis will be -p / q rotations during one rotation of the central axis. That is, this value becomes the ratio of the number of revolutions of the machining tank spindle to the number of revolutions, and this value is conventionally expressed as n / N. Although n / N can take a relatively wide value within a certain limit, when n / N = −1, it is most widely used.

When the cylindrical workpiece is stopped at a fixed position after the machining process, the main motor 6 is switched to the slow rotation.
For this purpose, a known frequency converter (commonly called an inverter or a frequency inverter, not shown in the figure) is installed, the frequency of the power supply to the main motor 6 is exchanged, and low speed rotation is performed.

The cylindrical work piece is configured to be removable, and the lower opening is covered with a lower lid 70. A manipulator or a loader and an unloader for installing and removing these cylindrical workpieces are installed outside the processing machine. As shown in FIGS. 1 and 2, the loader and the unloader are provided on both sides of the processing machine so as to face each other and are symmetrical to each other, but the structures may be the same. The structure of the loader and the unloader will be described later.

The polishing stone used in the inner surface polishing apparatus of the present invention may be either a wet type or a dry type. In the case of a wet type, a polishing stone and a compound solution are mixed and used, and they are excellent in cutting ability, deburring ability, rounding, etc., but liquid processing is required at the time of automation. In the case of dry type, it is suitable for polishing, using organic stones (walnuts, corn cores, etc. crushed) or plastics grains with abrasives or oils and other additives impregnated,
Since it is in a dry state, there is an advantage that media processing is easy.

As shown in FIG. 1, the structure of the driving device for the cylindrical workpiece is such that the rotating shafts 10a, 10b, 10c, ... Are bearings 12a, 12b, 12c ,.
Etc. are rotatably supported in the same manner, and the pans 13a, 1 are provided at the upper ends of the rotary shafts 10a, 10b, 10c ,.
3b, 13c, ... Are fixed. Tubular work 14
a, 14b, 14c, 14d, 14e and 14f are mounted on it. The lower opening of the cylindrical workpiece 14a or the like is covered by the lower lid 70. The cylindrical workpieces 14a and the like are clamped during machining by the workpiece clamping devices 15a, 15b, 15c, etc. provided on the upper turret 4 directly above each. This clamp device rotates together with the cylindrical work piece 14a, keeps the airtightness in the cylindrical work piece during machining, and moves up to release the tightness and sealing of the cylindrical work piece after finishing the machining. Mechanisms such as that the lifting hydraulic cylinder does not rotate and that fluid pressure that powers these functions can be introduced even during planetary rotation are required.

The structure of each part will be described below. Figure 3
Shows a detailed view of the workpiece clamping device. This device comprises a hollow shaft 17 and a central shaft 18 that are rotatable with respect to a lower bearing 16 fixed to the upper turret 4.
7 has a central shaft 18 and keys 19a, 19b, 19c,
19d is coupled, slidable and configured to rotate with the hollow shaft 17. As shown in FIG. 3, the bush 21 is fixed to the upper end of the central shaft 18 to connect the central shaft 18 (rotating portion) and the hydraulic cylinder 20 for raising and lowering the central shaft (non-rotating portion). A bearing 24 is inserted between the piston rod 22 and an elevating flange 23 fixed to the tip of the piston rod 22 so that the bearing 24 can rotate and ascend and descend.

With the above-described structure, since the fixed hydraulic cylinder 20 can raise and lower the central axis 18 of the rotating cylindrical workpiece, the raising and lowering movement of the cylindrical workpiece tightens the cylindrical workpiece. It can be canceled. The cylindrical work is fixed during the polishing operation, leakage,
If a pressure drop occurs, the content of the cylindrical work piece may escape at high acceleration, which is dangerous. Therefore, hydraulic pressure is particularly used for the tensioning cylinder 20, and the pressure is shut off after pressure is applied. Even if the source pressure drops due to a power outage, etc., the processing tank is kept airtight. A commercially available hydro unit can be used for conversion from air pressure to oil pressure.

In order to prevent the lifting flange 23, that is, the piston rod 22, from rotating, a detent 25 is fixed to the upper bearing 27, and the tip of the detent 25 is fitted into the straight groove 26 provided in the lifting flange 23. is there.

At the lower end of the central axis 18 of the cylindrical work,
The upper lid 28 is fixed, and when the piston rod 22 descends, the upper opening 28 of the cylindrical work piece is covered and tightened. Turret 4, 5
2 for stopping the fixed position of the upper turret 4 and the lower turret 5 as shown in FIG.
Install as many as the number of rotating shafts. The position regulating plate 29 is provided with a recess, and the position regulating knock 30 is fitted into the recess to stop at a fixed position.

Next, the manipulator will be described. Two manipulators, a loader and an unloader, are provided on both sides of the processing machine. A grinding stone is loaded into a cylindrical work piece whose lower opening is covered by the lower lid 31, is transferred to the front surface of the manipulator by a loader conveyor 56, and is stopped at a predetermined position by a stop device 33 in FIG.

Further, the machining-finished cylindrical workpiece is taken out of the processing machine by an unloader and carried out of the system by an unloader conveyor 57. The relative positions of the manipulator and the processing machine are shown in FIGS. 1 and 2, and more specifically in FIG.

In the above drawings, the cylindrical work piece in the processing machine is indicated by 14g, and the cylindrical work piece on the transfer device is indicated by 14h. The loader and the unloader have a mechanism for moving the cylindrical work piece from 14g to 14h, or conversely from 14h to 14g. Since both structures and operations are the same, only the loading side will be described.

The loader conveyor 5 is driven by the transport rollers 32.
A polishing stone is housed in the cylindrical workpiece 14k that has been conveyed over the workpiece 6. The cylindrical work piece stops at the stop device 33 that is in a protruding state at the stop position. This cylindrical work piece is conveyed by the loader into the inner surface polishing apparatus. Details of the structure of the loader are as shown in FIGS.

A loader conveyor 56 is provided on the front surface of the inner surface polishing apparatus.
Frames 34 and 35 are provided on both sides of the two, and the two are connected to fix the two guide shafts 36a and 36b. Sliders 37a, 3 sliding on the guide shafts 36a, 37b
7b is provided, and both are connected to fix the machine base 38. One end of the machine base 38 has a piston rod 40 of a fluid pressure cylinder 39.
The machine base 38 can be moved by the movement of the piston rod 40 of the fluid pressure cylinder 39. A fluid pressure cylinder 41 is fixed below the machine base 38. A manipulator mount 44 is fixed to the tip of the piston rod 42 of the fluid pressure cylinder 41 via a floating joint 43. Manipulator mounting flanges 49a and 49b are fixed to the mounting table 44, and bell crank-shaped manipulator claws 50a and 50b are mounted to the mounting flanges so as to be rotatable at a small angle. Claws 50a, 50b
Cushioning material 51a, 51b such as rubber or synthetic resin at one end
Is fixed so that the cylindrical work piece 14k is prevented from being scratched when the cylindrical work piece 14k is gripped.

The other ends of the manipulator claws 50a and 50b are connected to each other by a pin 52 so as to be rotatable at a small angle, and one arm is connected to a piston rod 61 of a fluid pressure cylinder 53. Therefore, the manipulator claws 50a and 50b are opened and closed by the movement of the piston rod 61 of the fluid pressure cylinder 53.

A plurality of (three in the figure) columns 45 are provided for guiding the elevation of the manipulator mounting base 44.
The bearings 46a, 46b and 46c fixed to the machine base 38 are slidable by fixing a, 45b and 45c. Known shock absorbers (shock absorbers) 54a and 54b are provided above the machine base 38, and the shock absorbers 54 when the manipulator claws 50a and 50b move forward.
The tips of a and 54b hit the outer wall of the processing device so that the impact is absorbed at this part, the limit switch is installed, and the manipulator claws 50a and 50b move forward to reach a position where a cylindrical workpiece can be gripped. Signal to indicate that.

As described above, when the number of cylindrical workpieces provided in one inner surface polishing apparatus is an even number and they are arranged at the same angular interval, the manipulator is aligned with the diameters of the turrets 4 and 5 as shown in FIG. It suffices to arrange them, and both the loader conveyor and the unloader conveyor can be arranged at right angles to the above diameter.
Further, since the above-mentioned cylindrical work piece only needs to make a linear movement in the same direction as the diameter direction of the turret, there is an advantage that the structure is simple.

The operation of the device of the present invention will be described based on the structure described above. The device of the present invention is, in principle, operated fully automatically by using a known sequence control method, but part of the device can be manually operated.

That is, when the prescribed processing time ends, a current flows through the frequency inverter to the main motor by the action of the timer, and the rotation is switched to the slow speed.
In this case, the knock 30 for position regulation advances and fits into the recess of the position regulation plate 29 to stop at a fixed position. This stationary stop is detected by a proximity switch (not shown) provided around the turret 4 or 5, and a signal is sent to the control device. By this signal, the pressurized fluid is introduced to the piston rod side of the hydraulic cylinder 20 at the cylindrical workpiece take-out position (position A in FIG. 2), the upper lid 28 shown in FIG. 3 is lifted, and the cylindrical workpiece 14a or the like is lifted. Release the contract. At the same time, the manipulator claws 50a and 50b on the unloader side move forward. At this time, the manipulator claws 50a and 50b are in the open state and are lowered by the fluid pressure cylinder 41.

That is, since pressurized fluid is introduced into the piston side of the fluid pressure cylinder 39, the manipulator claws 50a, 5a,
0b moves forward. The end of the forward movement is shock absorbers 54a and 54b
The impact is alleviated, and the forward movement is detected by the proximity switch 55 provided therebetween. In response to the signal output from the proximity switch 55, a pressurized fluid is introduced to the piston rod 61 side of the fluid pressure cylinder 53 to close the manipulator claws 50a and 50b to hold the cylindrical work, and the piston rod of the fluid pressure cylinder 41. The manipulator pawls 50a and 50b are raised by 42, and pressurized fluid is introduced to the piston rod 40 side of the fluid pressure cylinder 39 to move the cylindrical workpiece to the position of the unloader conveyor 57.

At this position, the manipulator claws 50a, 50b
Is released, the cylindrical workpiece is lowered onto the unloader conveyor 47, and is conveyed to the next step (delivery of contents) by the conveying roller 32.

Next, the turrets 4 and 5 are set to 360 ° / S (S
Rotates by the number of rotation shafts) and performs the same operation as described above to separate the cylindrical workpiece. When S / 2 times of disengagement are performed, from the next time, the machined tubular work piece will come to the unloader side and the saucer without the cylindrical work piece will come to the loader side, so the former operation is similar to the previous operation. The work piece is removed and the latter is loaded with the raw cylindrical work piece.

The loading of this unprocessed cylindrical work piece is the reverse of the step of removing the cylindrical work piece, and is self-explanatory, so a description thereof will be omitted. When the S-shaped cylindrical work piece is separated in this way, the machined corner cylindrical work piece disappears, and the unprocessed cylindrical work piece becomes S / 2 sets. Perform only cylindrical work pieces. In this way, when the unprocessed cylindrical work pieces are formed in the S group, the main electric motor is rotated at a high speed, the processing is started, and the above-described operations are repeated thereafter. A flow chart of these operations is shown in FIG.

[0038]

Embodiment 2 In the embodiment shown in FIG. 8, a cylindrical workpiece (aluminum wheel) 67 having a spoke 47 and a rim 48 is inserted into an inner step portion 46a of a cylindrical container 46 having a bottom 45, and an upper lid 28 is formed. Is a close fit. When the abrasive material 58 is housed in the cylindrical container 46 and is fixed to the turret and revolves orbits, the spokes 47 flow due to the flow of the abrasive stone 58.
The upper and lower surfaces and the inner surface of the rim 48 can be surely polished. In the above embodiment, the bolt 7 is provided at the center of the bottom 45.
It is also possible to plant 3 and insert it into the holes 74 of the spokes 47 and fix it with nuts 75.

[0039]

Third Embodiment In the embodiment shown in FIGS. 9 to 11, rollers 60a and 60b are installed horizontally and in parallel on the upper part of a machine base 59, and a pulley 63 fixed to a shaft 62 of the roller 60a and a shaft of a motor 64 are installed. A belt 66 is mounted between the fixed pulley 65 and the pulley 60, and the cylindrical workpiece 6 is placed on the rollers 60a and 60b.
7 is mounted. The cylindrical workpiece (aluminum wheel) 67 is spoked to the inner step of the bottomed tubular body 68.
The rim 48 with 7 is fitted and the upper lid 28 is tightly fitted.

In this case, a circular flange 69 is provided on the outer peripheral side of the bottom of the bottomed tubular body 68, and a circular flange 70 having the same outer diameter as the circular flange 69 is also provided on the outer peripheral side of the upper lid 28. The roller 60 is placed on the rollers 60a and 60b.
When a is rotated in the direction of arrow 71, the cylindrical workpiece 67 also rotates in the direction of arrow 72. Therefore, if a proper amount of the grinding stone 58 is accommodated in the cylindrical work 67, the upper and lower surfaces of the rim 48 and the inner surfaces of the spokes 47 are automatically and reliably ground.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged cross-sectional view showing a structure for tightening a tubular work similarly.

FIG. 4 is a front view showing a relative positional relationship between the manipulator and the inner surface polishing apparatus.

FIG. 5 is an enlarged detailed view of a partial cross section of the manipulator.

FIG. 6 is an enlarged plan view of the manipulator.

FIG. 7 is a flow chart of full automation of the embodying apparatus.

FIG. 8 is an enlarged cross-sectional view of a work piece according to the present invention.

FIG. 9 is an enlarged cross-sectional view of another implementation workpiece.

FIG. 10 is a front view of an embodiment of the work piece driving device.

FIG. 11 is a side view of the same.

[Explanation of symbols]

1 frame 2 center axis 3 outer axis 4 upper turret 5 lower turret 6 main motor 7 main sprocket wheel 8 chain wheel housing 9a, 9b chain wheel 10a, 10b, 10c rotation axis 11a, 11b, 11c rotation chain wheel axis 14a, 14b , 14c, 14d, 14e, 14f, 1
4 g, 14 h Cylindrical workpiece 15 a, 15 b, 15 c Work clamp device 16 Lower bearing 17 Hollow shaft 18 Center shaft 20 Hydraulic cylinder 22 Piston rod 23 Lifting flange 28 Upper lid 29 Position regulating plate 30 Position regulating knock 31 Lower lid 32 Conveyor roller 33 Stop device 34, 35 Frame conveyor 38 Machine stand 39, 41 Fluid pressure cylinder 40, 42 Piston rod 43 Floating joint 44 Manipulator mounting stand 45 Bottom 46 Cylindrical container 47 Spoke 48 Rim 50a, 50b Manipulator claw 51a, 51b Buffer Material 53 Fluid Pressure Cylinder 54a, 54b Shock Absorber 55 Proximity Switch 56 Loader Conveyor 57 Unloader Conveyor 58 Abrasive 59 Machine Stand 60a, 60b Roller 61 Piston Rod 67 Cylindrical Workpiece 68 Bottomed Cylindrical Body

Claims (4)

[Claims] 1. A cylindrical work having an abrasive stone charged therein is rotatably installed between two turrets, and the turret is rotated at a high speed to impart an orbital motion and a rotation motion to the cylindrical work. In a centrifugal flow barrel processing machine for processing the inner surface of a tubular work, a lower lid that covers the opening is attached to a lower opening of the tubular work, and a rotary shaft below the tubular work is attached. A cylinder characterized in that a pan is fixed, an upper lid is fixed to an upper rotation shaft, and a clamping device for clamping the cylindrical work is attached to the turret between the pan and the upper lid. Inner surface polishing device for workpieces. 2. A cylindrical work having an abrasive stone charged therein is rotatably installed between two turrets, and the turret is rotated at a high speed to impart an orbital motion and a rotation motion to the cylindrical work. In a centrifugal flow barrel processing machine for processing the inner surface of a cylindrical work, a lid is attached to each of the upper and lower openings of the cylindrical work, and a saucer is provided on each of the upper and lower rotating shafts for rotating the cylindrical work. An inner surface polishing apparatus for a cylindrical workpiece, which is fixed and is equipped with a tightening device for tightening the cylindrical workpiece between the upper and lower trays on the turret. 3. A device for tensioning a cylindrical work piece has a lower part as a double shaft, and is rotatably supported by an outer hollow shaft, and a rotation shaft of the cylindrical work product is slidable inside the hollow shaft. Through the
A fluid pressure cylinder for raising and lowering is provided on the upper portion, and the lower end of the piston rod of the fluid pressure cylinder is formed into a box shape, and is rotatably coupled with the tip of the rotation shaft of the cylindrical work, The inner surface polishing apparatus for a cylindrical workpiece according to claim 1 or 2, wherein the box-shaped portion at the lower end of the rod is configured to be non-rotatable / movable up and down by a rotation stopper from the outside. 4. A cylindrical work having a lid attached to each of the openings at both ends thereof and a polishing stone inserted therein is rotatably placed horizontally on a pair of rotatable rollers, and at least one of the pair of rollers is provided. An inner surface polishing apparatus for a cylindrical work piece, characterized in that a rotary power is connected to one side.