JPS60213475A - Magnetic attraction type rotary polishing tool - Google Patents

Abstract

PURPOSE:To keep polishing pressure constant at all times even if a workpiece surface is complicated in its bending and thereby effectively process the workpiece surface by continually pressing the whetstone of a polishing tool body against the workpiece surface via a guide rod. CONSTITUTION:With a drive motor 2 rotated, three whetstone shafts 6 are rotated on its own axis or revoluted around other axis via the first bevel gear 10 of an output shaft 2a, the second bevel gear 12 of a rotary shaft 11, a first spur gear 13, the rotary shaft 11, the first transmittion gear 19 of a transmission member 20, a second transmission gear 26, a core 24, and a spline member 25, while a casing 5 is rotated via the first bevel gear 10, the second bevel gear 12, the first spur gear 13 and a second spur gear 16, a shaft 15, the second transmission gear 19, and an internal gear 22. Then, a polishing tool body 1 is moved along the workpiece surface while holding a handle 3, and a whetstone 33 is pressed with constant polishing pressure against the workpiece surface while holding the whetstone 33 with a guide rod 8 for effectively polishing the workpiece surface W.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a magnetic suction type rotary polishing tool, and more specifically to a magnetic suction type rotary polishing tool that can efficiently polish a wide surface to be polished while keeping the polishing pressure constant. This invention relates to rotary polishing tools. [Prior Art] Conventionally, as a method for polishing a surface to be polished such as a mold or the surface of a vehicle body, as disclosed in Japanese Patent Application No. 58-35612, a method using a plurality of grindstones and a surface to be polished is used. It has been proposed to move the grindstone along the surface to be polished by forming a magnetic circuit between the two to create the necessary polishing pressure, and to perform polishing while rotating the entire grindstone.

The polishing method according to the above application keeps the grindstone at a constant polishing pressure by following the surface of the polisher, even when the surface to be polished is a curved or uneven surface, and effectively suppresses inertial force, reaction force, and polishing vibration. It was solved.

By the way, there are two types of polishing work as described above: one is to attach the polishing tool itself to the spindle of a numerical control device or the arm of a robot soto and perform the work automatically, and the other is to carry out the work while the worker holds the polishing tool in his hand. There is.

In the former type of machining work, all polishing is done automatically, so a uniformly machined surface can always be obtained, but in the latter case, the worker holds a heavy polishing tool by hand and applies it to the surface to be polished. Since processing is performed while pressing, it is difficult to obtain a uniformly polished surface, and it is also difficult to efficiently polish a wide surface to be polished, and furthermore, when the surface to be polished is complicatedly curved or uneven. In addition, when the polishing tool has a free-form surface such as a delicate undulation, the natural vibration of the polishing tool becomes large, and a horizontal stripe pattern perpendicular to the polishing direction occurs on the surface to be polished, making it difficult to obtain a good polished surface. There was a problem.

[Purpose of the invention]

This invention was devised by focusing on the conventional problems, and its purpose is to efficiently cover a wide surface to be polished even when the polishing tool is operated manually, and to adjust the polishing direction. To provide a magnetic attraction rotary polishing tool that can perform polishing without producing vertical horizontal stripes.

[Structure of the invention]

In order to achieve the above object, the present invention forms a magnetic circuit between a surface to be polished and a grinding wheel body, and a magnetic suction type rotary polisher that polishes the surface to be polished while creating a constant polishing pressure. The tool is a tool in which a plurality of cores are rotatably installed inside a casing that is rotatably supported by a part of a gear housing, and each of the cores and a rear end of a plurality of grindstone shafts are spline-fitted. At the same time, a grindstone body equipped with a magnet is swingably connected to the tip of the grindstone shaft via a universal joint, a guide rod whose length is adjustable is attached to the casing between the grindstone shafts, and the gear housing is The gist is that a gear mechanism connected to a drive motor is installed inside, and the core and casing are each rotatably connected to this gear mechanism via a transmission gear.

[Embodiments of the invention]

The present invention will be described in detail below based on the accompanying drawings.

FIG. 1 shows a partial sectional view of a manually operated polishing tool main body 1 embodying the present invention. A casing 5 is rotatably supported. A grindstone main body 7 is vertically mounted on the casing 5 through a plurality of (three in this embodiment) grindstone shafts 6 so as to be able to move up and down and rotate freely. A freely adjustable guide rod 8 is provided.

A gear mechanism 9 connected to the output shaft 2a of the drive motor 2 is housed inside the gear housing 4.

This gear mechanism 9 has a first bevel gear 10 fitted to the output shaft 2a, and a rotating shaft 11 that meshes with the first bevel gear 10 and is rotatably housed in the center of the gear housing 4. The attached second bevel gear 12, the first spur gear 13 fixed to the rotating shaft 11, and the shaft 15 which meshes with the first spur gear 13 and is rotatably supported by the gear housing 4. A second spur gear 16 is fitted to the upper end.

The tip of the rotating shaft 11 protrudes into the center of the casing 5, and a guide rod 8 that protrudes from the center of the lower surface of the casing 5 is attached to the tip surface of the rotating shaft 11, the length of which is adjusted via an adjustment nut 17. It is attached freely.

Moreover, on the outer periphery of the rotating shaft 11 protruding into the casing 5,
Transmission member 2 with first transmission gear 19 via key 18
o is fitted.

Next, the casing 5, which is rotatably supported at the lower part of the gear housing 4 via a bearing member 21, has a small internal gear 22 fixed to its upper peripheral edge via a port 23. A second transmission gear 19a fitted to the lower end of the shaft 15 is meshed with the second transmission gear 19a.

Inside the casing 5, there are multiple (3 on this real male side)
Cores 24 each having a hollow cylindrical shape are arranged at predetermined intervals. A grindstone shaft 6 supporting the grindstone main body 7 is spline-fitted into the core 24 via a spline member 25 .

A second transmission gear 26 that meshes with the first transmission gear 19 formed on the transmission member 20 is provided on the outer peripheral surface of the core 24 .

Therefore, a part of the rotational driving force from the drive motor 2 is fixed to the first bevel gear 10 fitted to the output shaft 2a - the second bevel gear 12 fitted to the rotating shaft 11 - the rotating shaft 11. The first flat wheel 13 - the rotating shaft 11 - the first transmission gear 19 of the transmission member 20 - the second transmission gear 26 - the core 24 - the spline member 2
5 to the grindstone shaft 6.

The other rotational driving force of the drive motor 2 is as follows: first bevel gear 10 - second bevel gear 12 fitted on the rotating shaft 11 -> first spur gear 13 fixed to the rotating shaft 11 -> second spur gear 16-shaft 15-second transmission gear 19a→transmitted to the casing 5 via the internal gear 22.

Therefore, the casing 5 and the grinding wheel shaft 6 are configured such that the rotational driving force from the drive motor 2 is transmitted via the planetary gear mechanism, and when the drive motor 2 rotates, the casing 5 maintains a constant rotational speed. The grindstone shaft 6 is decelerated to rotate in a constant direction, and at the same time, the grindstone shaft 6 rotates on its own axis and revolves around the sun.

Next, as shown in FIG. 2, the grindstone main body 7 is swingably connected to the tip of the grindstone shaft 6 via a universal joint 30.

The grindstone body 7 includes a magnet holder 32 with an annular magnet 31 (permanent magnet) attached to its tip, and a grindstone holder 34 with an annular grindstone 33 such as a cast iron bond diamond grindstone attached.
It is composed of.

The connecting portion between the magnet holder 32 and the universal joint 30 is a fitting recess 3 formed on the base end side of the magnet holder 32.
The ball 30a of the universal joint 30 is rotatably fitted into the opening of the fitting recess 35 via the pin 36.
A stop ring 37 is fitted to prevent the ball 30a from coming out of the fitting recess 35.

A screw 38 is formed on the outer peripheral surface of the magnet holder 32, and the grindstone holder 34 is slidably fitted onto the screw 38 via a ring member 39.

In addition, 40 is a fixing screw for fixing the grindstone holder 34 to the magnet holder 32, and W represents the surface to be polished of the workpiece.

Next, a case in which the surface to be polished W is polished will be described.

First, when rough polishing the surface W to be polished using the rough whetstone 33 as a preparation for the polishing operation, it is necessary to strengthen the attraction force of the magnet 31 to the surface W to be polished.
The clearance h between the tip of the grindstone 33 and the tip of the magnet 31 is set small.

This operation involves loosening the fixing screw 40 and rotating the grindstone holder 34 in a fixed direction along the screw 38 of the magnet holder 32. When the tip of the grindstone 33 approaches the tip of the magnet 31,
The grindstone holder 34 is fixed at a predetermined position with a fixing screw 40.

In this state, a magnetic circuit X is formed between the magnet 31 and the surface W to be polished, and the grindstone 33 is attracted to the surface W to be polished.

On the other hand, when finishing polishing the surface W to be polished using a fine grindstone 33, it is necessary to weaken the attraction force of the magnet 31 to the surface W to be polished. The clearance h between the magnet 31 and the tip of the magnet 31 is set large.

After completing the setup work as described above, remove the polishing tool body l.
When the grindstone 33 is pressed against the surface W to be polished via the guide rod 8 while the drive motor 2 is rotated while holding the handle 3 of the
The first bevel gear 10 fitted to the rotating shaft 11 - the second bevel gear 12 fitted to the rotating shaft 11 - the first spur gear 13 fixed to the rotating shaft 11 - the rotating shaft 11 -> the first transmission of the transmission member 20 Gear 19→
The second transmission gear 26 - the core 24 → the thread 54 is rotated and driven while rotating and revolving around the shaft 25, and on the other hand, the casing 5 is connected to the first bevel gear 10 - the second bevel fitted to the rotating shaft 11. Gear 12 - first spur gear 1 fixed to rotating shaft 11
3 → second spur gear 16 - shaft 15 - 1 second transmission gear 19 - internal gear 22 for rotational driving.

Then, as shown in FIG. 3, when the polishing tool main body 1 is moved in the direction of the arrow along the surface W to be polished, the grindstone 33 is always held by the guide rod 8 and a constant polishing pressure is maintained. The polished surface W is polished in this state. In addition, the existence probability of the whetstone 33 of 3 (11i1) at this time is that the other two whetstones 33 are superimposed on a part of the polished surface W polished by the first whetstone 33, and Since the polishing surface W is polished, a wide polishing surface can be efficiently polished at one time.

Note that even if the surface W to be polished is curved or uneven, the polishing tool main body 1 is always held by the guide rod 8 against the surface W to be polished, so the polishing pressure is always constant. Also, since the grinding wheel 33 is swingably connected via the universal joint 30, the grinding wheel 33 is always displaced in the normal direction with respect to the surface W to be polished, and therefore the unevenness of polishing of the surface W to be polished is This eliminates the problem and enables efficient polishing.

Further, the tip 8a of the Gytro 7-do 8 is always in sliding contact with the surface W to be polished, and moves while sliding on the surface W to be polished while the polishing tool main body 1 is being moved. In addition,
The tip 8a of the guide rod 8 is made of synthetic resin and has a rounded tip so as not to damage the polished surface W, and is constructed to be easily replaceable. Furthermore, it is also possible to have a structure in which a rotating ball or the like is incorporated into the tip 8a of the guide rod 8.

Such polishing work is performed by adjusting the clearance h between the grindstone 33 and the magnet 31 according to the processing state of the surface W to be polished.

Next, FIG. 4 shows another embodiment in which the polishing tool main body 1 according to the present invention is attached to an automatic polishing device 50 for automatic polishing.

In this embodiment, the side surface of the gear housing 4 or casing 5 is rotatably connected to the tip of an arm member 52 via a joint 51. The rear end of this arm member 52 is supported by a slide member 53 so as to be able to rise and fall freely, and the slide member 53 is slidably inserted into a slide shaft 55 installed on the machine frame 54. Further, this slide member 55 is slidably screwed onto a screw shaft 57 installed on a machine frame 56, and a reversible motor 59 is connected to one end of this screw shaft 57 and is driven based on a command from a control device 58.
is connected. The slide member 55 reciprocates in the left-right direction via the screw shaft 57 by driving the reversible motor 59 in forward and reverse rotation.

In this state, when the control device 58 is operated to drive the reversible motor 59 in forward or reverse rotation, the screw shaft 57
The slide member 55 reciprocates in the left-right direction via the arm member 52, and at the same time, the polishing process is performed while automatically moving the plurality of grindstones 33 of the polishing tool main body l along the surface W to be polished via the arm member 52. It is something to do.

Furthermore, when performing the automatic polishing, a constant polishing pressure is always maintained between the surface W to be polished and the grindstone 33, so the first
The work is performed by removing the guide rod 8 attached in the embodiment from the casing 5.

Note that other configurations and effects are the same as those of the first embodiment, so the same reference numerals are given and explanations are omitted.

Note that the above embodiment has been explained for the case of polishing the surface to be subjected to IIFFIJ, such as the surface of a mold or the body of a vehicle, but it can also be applied to the case of polishing the side of a ship's body or the surface of an object that requires precision. It is also possible to implement this method.

〔Effect of the invention〕

The present invention is a magnetic attraction type rotary polishing tool that forms a magnetic circuit between the surface to be polished and the grindstone body as described above, and polishes the surface to be polished while creating a constant polishing pressure. A plurality of cores are rotatably installed inside a casing that is rotatably supported by a part of the gear housing, and each core is spline-fitted to the rear end of the plurality of grindstone shafts. At the same time, a grinding wheel body equipped with a magnet is swingably connected to the tip of the grinding wheel shaft via a universal joint, a guide rod whose length can be freely adjusted is attached to the casing between the grinding wheel shafts, and a guide rod is attached to the inside of the gear housing. A gear mechanism connected to the drive motor is installed inside, and the core and casing are rotatably connected to this gear mechanism via a transmission gear, so even when the polishing tool is manually operated, a wide surface to be polished can be achieved. This has the effect of allowing the polishing process to be carried out efficiently and without producing horizontal stripes perpendicular to the polishing direction.

In particular, when the surface to be polished is complexly curved or uneven, or even has a free-form surface such as a delicate undulation, the surface to be polished can be polished while always maintaining a constant polishing pressure between the grinding wheel and the surface to be polished. This has the effect of efficiently polishing surfaces.

Furthermore, since the structure is relatively simple, it can be manufactured at low cost and maintenance is easy.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of a magnetic attraction type rotary polishing tool embodying the present invention, Fig. 2 is a partially enlarged sectional view of the grinding wheel body, and Fig. 3 is a partially enlarged sectional view of the grinding wheel body.
The figure is an explanatory diagram showing the processing state of the grindstone, and FIG. 4 is a schematic diagram of another embodiment in which the magnetic attraction rotary polishing tool according to the present invention is implemented in an automatic polishing apparatus. 1... Polishing tool body, 2... Drive motor, 4...
Gear housing, 5... Casing, 6... Grinding wheel shaft, 7... Grinding wheel body, 8... Guide iron, 9...
Gear mechanism, 19.26...1st. Second transmission gear, 24
...Core, 31...Magnet, W...Surface to be polished. Agent: Patent Attorney Shin Ogawa − Patent Attorney Ken Noguchi Teru Patent Attorney Kazuhiko Saishita

Claims (1)

[Claims] A magnetic attraction type rotary polishing tool that forms a magnetic circuit between the surface to be polished and the grinding wheel body and polishes the surface to be polished while creating a constant polishing pressure. A plurality of cores are rotatably installed inside a casing that is rotatably supported by a casing, and each core is spline-fitted to the rear end of a plurality of grinding wheel shafts, and the cores are rotatably supported at the tip of the grinding wheel shaft. Grinding wheel bodies equipped with magnets are swingably connected via a joint, a length-adjustable guide rod is attached to the casing between the grinding wheel shafts, and a gear mechanism connected to a drive motor is installed inside the gear housing. A magnetic attraction type rotary polishing tool, characterized in that the core and the casing are each rotatably connected to the gear mechanism via a transmission gear.