JPH06106477A - Super-finishing working device - Google Patents

Abstract

PURPOSE:To carry out polishing work in fine surface roughness by removing foreign matters contained in grinding liquid. CONSTITUTION:A centrifugal sparator 16 is arranged to carry out centrifugal separation on foreign matters contained in used grinding liquid 21 discharged from a surface polishing device body 15. Next, a 10mum filter unit 10 is arranged to remove the foreign matters of not less than 10mum. A 5mum filter unit 20 is also arranged to remove the foreign matters of not less than 5mum. The grinding liquid from which the foreign matters of not less than 5mum are resupplied to the surface polishing device body 15. Circulation of this grinding liquid 21 is carried out by a pump 8. In this way, when particle diameters of the forein matters contained in the grinding liquid 21 are less than 5mum, the maximum surface roughness of a polished material becomes reliably 1mum or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film type super finishing apparatus.

[0002]

2. Description of the Related Art FIG. 3 is a schematic view showing a printer of an office automation equipment. This printer emits ions 2 generated from an ion cartridge 1 toward a rotating drum 3 based on a print symbol, and charges the drum 3 with an electric charge corresponding to a print signal to form an electrostatic latent image. Then, the image is visualized by the one-component magnetic toner 4 magnetized by the magnet roller 5. Next, pressure and pressure are applied from the back side of the fed paper 6 by the pressure roller 7, so that transfer and fixing are performed at the same time. Then, the residual toner on the drum 3 is removed by the cleaning blade 8, and the residual charge on the drum 3 is erased by the eraser 9 for the next image formation.

In the printer having such a structure, one of the major factors that determines the image quality is the gap size P between the drum 3 and the magnet roller 5 when the electrostatic latent image on the drum 3 is visualized. That is, if the change (fluctuation) of the dimension P is large, there are problems such as distortion of characters and symbols, and shading of printing. Therefore, drum 3, magnet roller 5
Both require high precision in their processing.

In particular, the drum 3 is required to be capable of retaining electric charge, to have a high surface hardness in order to realize a long life, to have good abrasion resistance, and to have good releasability of the one-component magnetic toner. To be Therefore, the cylindrical surface of the drum is coated with an insulating coating having a thickness of 30 to 40 μm.

The state is shown in FIG. The coating film 10 was made of a resin containing fine particles such as alumina oxide, and was spray-coated on the drum 3. The surface roughness of the coating film 10 has a maximum surface roughness of 3 to 4 μm, and the surface has a skin called orange peel, so that the following problems occur.

[0006] Because the surface roughness is rough, 1-2 is attached to the surface.
The amount of toner 4 which is fine particles of μm does not become constant, and
There was a problem that the density of characters, symbols, etc. transferred to was uneven. The resin coating film 10 contains fine particles of alumina oxide or the like in order to have abrasion resistance, but the fine particles of alumina oxide or the like settle below the coating film 10 without being uniformly dispersed in the resin coating film 10. Occurs, and as a result, the particles in the layer of 5 to 10 μm above the coating film 10 are insufficient. The portion lacking the fine particles has drawbacks such as low hardness and low abrasion resistance. Therefore, there is a big problem in the durability of the drum.

Therefore, it is necessary to polish the coated drum by a well-known film type superfinishing apparatus to remove 5 to 10 μm in a portion having insufficient hardness and to suppress the maximum surface roughness to 1 μm or less.

The well-known processing principle of the film type superfinishing apparatus is, as shown in FIGS. 5 and 6, rotatably held by a rubber roller 11 having an appropriate hardness, a rotation center 13 and a chuck 14. The polishing film 12 (abrasive grain size 15 μm to 5 μm-5) having a grain size necessary for making the maximum surface roughness of the drum about 1 μm between the drum 3 and
μm) to reciprocate the rubber roller 11 in the longitudinal direction of the drum 3 while vibrating b to move the drum 3 to the rotating a.
The surface of the drum 3 is finished by the pressure obtained by pressing it around 0.5 mm.

Aqueous solution (grinding liquid) 2 suitable for polishing
By continuing to flow 1 onto the contact surface between the drum 3 and the rubber roller 11 via the polishing film 12, the heat generation of the drum 3 was suppressed and the abrasive grains and foreign substances that had fallen off by polishing were washed away. In addition, when processing one drum, the abrasive grain size is 15 μm (# 1000), 9 μm.
Three types of films 12 of m (# 2000) and 5 μm (# 3000) were used in the above order, and the processing time of one drum at this time was about 10 minutes.

[0010]

However, the above-mentioned conventional film type superfinishing apparatus has the following problems. Conventionally, when processing the drum 3, FIG.
As shown in FIG.
After the No. 1 once entered the tank 16, it was circulated to the polishing apparatus main body 15 again by the pump 17.

In this method, 1 used in the initial stage
Since the impurities such as abrasive grains generated from the film of 5 μm and 9 μm and the removed coating material are circulated again, the polishing abrasive grains, the coating material removed by polishing and the foreign substances mixed in from other sources remain. The circulating grinding liquid 21 in FIG.
2 and the particularly large particles (5 to 15 μm or more) present in the grinding fluid scratch the drum 3 to deteriorate the surface roughness of the drum 3 (maximum surface roughness 1.5 to 3 μm).
m) had occurred. In the situation of the above-mentioned inconveniences, among the particles contained in the grinding fluid 21, the coating material removed by polishing is
The polishing efficiency of the film 12 gets into the gap of the polishing abrasive grains, which causes the film 12 to be clogged and the processing speed becomes slower (the processing time becomes longer) depending on the number of processings (about 10 minutes in the initial processing state). Processing time of 2
(It extends to approximately 14 minutes at the time of processing about 0).

The present invention has been made in view of the above-mentioned problems of the prior art, and by removing foreign matter such as the falling abrasive grains contained in the grinding fluid and the removed coating material, the drum An object of the present invention is to provide a super-finishing processing device capable of processing the maximum surface roughness (Rmax) to 1 μm or less and in which the processing efficiency does not decrease with time.

[0013]

In order to achieve the above object, the present invention provides a film type superfinishing apparatus,
A centrifugal separator for removing impurities in the grinding fluid is provided in the circulation path of the grinding fluid supplied to the processing apparatus, and at least one filter unit for removing fine impurities in the grinding fluid is provided.

[0014]

According to the above construction, the foreign matter of several to several tens of μm contained in the grinding fluid is removed by the centrifugal separator and the foreign matter of 5 μm is removed.
Foreign matter of m or more or 1 μm or more is removed by the filter unit.

[0015]

[Embodiment 1] FIG. 1 is a perspective view showing Embodiment 1 of a superfinishing apparatus according to the present invention. The processing apparatus of this embodiment is
Surface polishing apparatus body 1 for superfinishing the surface of a work piece
5 and the grinding liquid 21 discharged from the surface polishing apparatus main body 15
Centrifuge 16 for centrifuging particles / foreign matter contained therein
And a tank 1 for storing the grinding fluid 21 from the centrifuge 16.
7, a pump 18 provided in a tank 17 for circulating the grinding liquid 21, a 10 μm filter unit 19 for removing particles and foreign matters contained in the grinding liquid 21 sent from the tank 17, and a 10 μm fill unit Removal of particles and foreign matter contained in the grinding fluid 21 sent from 19
and a μm filter unit 20. 5μ
The grinding fluid 21 that has passed through the m filter unit 20 is sent to the surface polishing machine main body 15, circulates, and is used again. In addition, in the above-mentioned structure, the mounting positions and the number of the tank 17 and the pump 18 in the circulation path are not particularly limited.

According to the superfinishing apparatus of this embodiment, the grinding liquid 21 that has taken in foreign substances such as abrasive grains and coating material generated in the surface polishing apparatus body 15 first prevents clogging of the 10 μm filter unit 19. Therefore, after the centrifugal separator 16 removes large particles / foreign substances of several μm to several tens of μm or more, the pump 1 is passed through the tank 17.
Sent to the 10 μm filter unit 19 by 8
To prevent clogging of the μm filter unit 20, 10
Fine particles of μm or more are removed. Finally, grinding fluid 2
1 is sent to the 5 μm filter unit 20, fine particles of 5 μm or more are removed, and the cleaned grinding fluid 21 is supplied to the surface polishing apparatus body 15. Then, the circulation of the grinding liquid 21 is performed by the pump 18 incorporated in the circulation path.

According to this embodiment, the surface polishing apparatus body 15
Of the fine particles generated by, the particles having a size of 5 μm or more can all be removed. It has already been stated that the grain size of the abrasive grains of the film 12 required to obtain the surface accuracy of the drum surface roughness (Rmax) of 1 μm or less is 5 to 15 μm. Since there is no more than 5 μm,
The influence of the fallen abrasive grains is eliminated, the maximum surface roughness of the drum is guaranteed to be 1 μm or less, and the processing efficiency does not extend according to the number of processing as in the conventional method. It becomes possible to always maintain the time of 10 minutes. In this embodiment, the filter units 19 and 20 of 5 μm and 10 μm are used.
If it is 5 μm or less, it is not limited to this.

[0018]

Second Embodiment FIG. 2 is a perspective view showing a second embodiment of the superfinishing apparatus according to the present invention. The super-finishing processing apparatus of the present embodiment is 1 μm between the 5 μm filter unit 20 and the surface polishing apparatus main body 15 in the circulation path of the grinding fluid 21.
The m-filter unit 22 is provided, and the other structure is the same as that of the first embodiment.

In this embodiment, fine particles of 1 μm or more can be removed from the grinding liquid 21 that has passed through the 5 μm filter unit 20.

According to this embodiment, 1 μm is contained in the grinding liquid 21.
Surface roughness of 0.8 μm because the above fine particles are not included
It is possible to process a drum having the following accuracy (0.6 to 0.8 μm). Further, regarding the processing efficiency, it is possible to maintain the initial processing time of 10 minutes as in the first embodiment.

[0021]

As described above, according to the present invention, since the fine particles of 5 μm or more contained in the grinding fluid are removed by the centrifugal separator and the filter unit and circulated, the surface roughness of the drum surface is reduced. The maximum surface roughness (Rmax) of the drum is 1 μm when the improvement and the removal of the surface layer of several μm are performed.
You can get the following drums: Further, during the processing of the drum, the polishing abrasive grains are not clogged, and the time can be maintained for about 10 minutes at all times, and the polishing can be performed without lowering the processing efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the present invention.

FIG. 3 is a schematic view showing a printer that uses a drum that is a material to be polished.

FIG. 4 is a semi-mounted front view of the drum showing an insulating coating film applied to the cylindrical surface of the drum.

FIG. 5 is an explanatory view showing a processing principle of a film type super finishing apparatus.

FIG. 6 is an explanatory view showing a processing principle of a film type super finishing apparatus.

FIG. 7 is a perspective view showing a conventional processing apparatus.

[Explanation of symbols]

 15 Surface Polishing Device Main Body 16 Tank 18 Pump 19 10 μm Filter Unit 20 5 μm Filter Unit 21 Grinding Fluid 22 1 μm Filter Unit

Claims (1)

[Claims] 1. A film-type superfinishing apparatus, wherein a centrifugal separator for removing impurities in the grinding fluid is provided in a circulation path of the grinding fluid supplied to the processing apparatus, and fine impurities in the grinding fluid are removed. A superfinishing device comprising at least one filter unit to be removed.