JPH0624681B2 - Burning device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a varnishing apparatus for polishing a polishing surface of a magnetic material by bringing a polishing tape into pressure contact with the magnetic material using pressurized air. .

(Prior Art) Among burnishing devices for polishing the surface (polishing surface) of a magnetic material such as a magnetic disk with a polishing tape, a burnishing device as disclosed in Japanese Patent Application No. 59-256290 filed by the present applicant is disclosed. There is a device that uses pressurized air to bring a polishing tape into contact with a polishing surface to perform polishing. As shown in FIG. 6, such a device has two air nozzles 22, 23 at opposite positions on both sides 1a, 1b of the magnetic disk 1 which can be driven to rotate in the direction of arrow A.
And a polishing tape supported by a guide roller between the air nozzle 22 on the side of the polishing surface 1a of the magnetic disk and the polishing surface 1a.
24 through. Therefore, when air is ejected from the air ejection port 22a of the air nozzle 22 of the polishing surface 1a, the polishing tape 24 is backed up to the polishing surface 1a side, and the air ejection port 23a of the air nozzle 23 on the surface 1b side opposite to the polishing surface 1a. When air is ejected from the magnetic disk 1, the magnetic disk 1 is backed up to the side of the polishing tape 24, and both backups press the polishing tape (24) against the polishing surface 1a. The tip of the polishing tape backup air nozzle 22 is formed in a semicircular shape, and the polishing tape 24 is transported in the direction of arrow B along the arc of the tip of the nozzle 22 and is rotated in the direction of arrow A. The surface 1a of the disk is abraded by being pressed against the surface 1a.

Generally, there are three types of factors that affect the burnishing effect of such a burnishing device: the burnishing time, the number of revolutions of the polishing surface, and the air pressure. Burnish time,
The rotation speed affects the smoothness and uniformity of the magnetic disk surface, and the air pressure affects the burnish depth. Although shortening the burnishing time leads to improvement in efficiency, it is necessary to increase the number of rotations of the polishing surface in order to obtain the same burnishing effect.

However, in the above apparatus, when the rotational speed of the magnetic disk is increased, an air layer is formed between the polishing tape and the polishing surface of the magnetic disk. As a result, the press contact between the polishing surface and the polishing tape by the pressurized air is hindered, and the polishing effect is reduced. Therefore, it has been impossible to rotate the magnetic disk at a high speed to improve the polishing efficiency.

(Object of the Invention) In view of the above problems, the present invention has an object to provide a burnishing device having a high polishing efficiency.

(Structure of the Invention) In the burnishing device according to the present invention, a portion of the tip of the polishing tape backup air nozzle that is on the rear side in the feeding direction of the magnetic material from the air ejection port forms an angle of 20 degrees or more with respect to the polishing surface. It is characterized in that it is formed in a tapered surface shape.

In this burnishing device, a polishing tape backup air nozzle is arranged so as to face a polishing surface of a magnetic material such as a magnetic disk, and a magnetic material backup air nozzle is arranged at a position facing the air nozzle with the magnetic material sandwiched therebetween. It is set up. The magnetic material is configured to move relative to the air nozzles so as to allow the entire polishing surface to be polished.

A polishing tape is interposed between the polishing surface of the magnetic material and the polishing tape backup air nozzle. When pressurized air is ejected from the polishing tape backup air nozzle, the polishing tape is backed up, and the magnetic material is backed up by ejection of pressurized air from the magnetic material backup air nozzle, and the polishing surface and the polishing tape are pressed against each other. It As described above, the air nozzle for backing up the polishing tape is formed such that a portion of the tip portion thereof on the rear side in the feeding direction of the magnetic material from the air ejection port is formed into a taper surface shape which makes 20 degrees or more with the polishing surface.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an overall front view of a burnishing device for a magnetic disk, FIG. 2 is a perspective view showing a drive mechanism omitted, and FIG. 3 is a sectional view of a nozzle portion.

In the illustrated magnetic disk 1, only the lower surface 1a of the lower surface 1a and the upper surface 1b is formed as a magnetic surface for recording / reproducing, that is, a surface to be polished (polishing surface). In the magnetic disk 1, the innermost peripheral portion 1c is held by a vacuum chuck 2a at the tip of the rotary shaft 2, and the rotary shaft 2 is rotationally driven by a drive mechanism (not shown), so that the magnetic disk 1 rotates at a high speed of 1000 to 3000 rpm, for example. To be done.

Polishing is performed by pressing the abrasive grain surface 3a of the polishing tape 3 against the polishing surface 1a of the magnetic disk 1. The pressure contact between the polishing tape 3 and the magnetic disk 1 is caused by the air nozzles 4 facing each other.
It is obtained by the wind pressure of the pressurized air blown from No. 5.

That is, a polishing tape backup air nozzle 4 for backing up the polishing tape 3 is disposed on the lower surface (polishing surface) side of the magnetic disk 1, and the air ejection port 4a of the polishing tape backup air nozzle 4 has an air ejection port 4a.
The polishing tape 3 is opened in the vicinity of the polishing surface 1a, and the polishing tape 3 is interposed between the air ejection port 4a and the magnetic disk 1. Also,
A magnetic disk backup air nozzle 5 for holding a polishing pressure by the polishing tape 3 of the magnetic disk 1 is disposed on the upper surface side of the magnetic disk 1 so as to face the polishing tape backup air nozzle 4. An air ejection port 5a of the air nozzle 5 for use is opened close to the magnetic disk 1 on the opposite side of the contact portion of the polishing tape 3.

As shown in FIG. 3, the polishing tape backup air nozzle 4 has a tip end portion formed into a mountain-shaped cross section having two tapered surfaces 4c and 4d, and the air ejection port 4a is opened at the top of the mountain shape. There is. One tapered surface above
4c, that is, a taper formed in a rear portion of the tip of the polishing tape backup air nozzle from the air ejection port 4a in the feeding direction of the magnetic material 1 (direction of arrow A, that is, the direction of relative movement to the air nozzles 4 and 5). The surface 4c forms an angle θ ₁ with the polished surface 1a of the magnetic material, and the other tapered surface 4d
Forms an angle θ ₂ with the polished surface 1a of the magnetic material.

The angle θ ₁ needs to be 20 ° or more, and preferably the tapered surface 4c should be formed so that 20 ° ≦ θ ₁ ≦ 56 °. The angle θ ₂ is not particularly limited, but 2
It is preferable that 5 ° ≦ θ ₂ ≦ 45 °, and the one shown is θ
_The tapered surface 4d is formed so that ₂ = 29 °.
It should be noted that the portion of the tip of the air nozzle on the front side of the air ejection port 4a in the feeding direction of the magnetic material 1 does not necessarily have to be the tapered surface 4d as shown in the drawing, and may have an arcuate cross section as in the conventional case, for example. good.

Further, the shape of the tip of the magnetic disk backup air nozzle 5 is not particularly limited and may be any suitable shape.

The air nozzles 4 and 5 are fixed to the substrate 6 at a predetermined interval, and pressurized air having a predetermined pressure is introduced into the introduction passages 4b and 5b at the center through the substrate 6 and slit-shaped from the introduction passages 4b and 5b. It is communicated with the air ejection ports 4a, 5a and ejected.
The pressure of the pressurized air supplied to the air nozzles 4 and 5 is
For example, it can be varied within a range of 6 kg / cm ² or less, and the polishing tape 3 and the magnetic disk 1 can be adjusted by adjusting the pressure of the pressurized air.
The polishing depth can be adjusted by changing the contact pressure with, and the pressure to the polishing tape backup air nozzle 4 is 1.0 to
When the pressure is limited to about 2.5 kg / cm ^{2, the} pressure against the magnetic disk backup air nozzle 5 is 1.5 to 4.0 kg / cm ^2.
It is preferable to set it to a degree.

On the other hand, the polishing tape 3 is hooked on guide rollers 7 and 8 arranged on both sides of the polishing tape backup air nozzle 4, and the magnetic disk 1 is driven by a feeding mechanism (not shown).
The intermittent feeding is performed so that the vehicle travels in a direction (arrow B direction) opposite to the rotational direction (feeding direction A) of the vehicle, and the traveling speed is, for example, about 7 mm / sec. As the polishing tape 3, the abrasive grains provided on the abrasive grain surface 3a are made of, for example, chromium oxide, silicon carbide, iron oxide, alumina oxide, diamond, or the like.

With the above configuration, while the magnetic disk 1 is rotated at a high speed by the drive mechanism, the compressed air of a predetermined pressure is respectively supplied from the two air nozzles 4 and 5 to the polishing tape 3 and the magnetic disk 1.
Then, the polishing tape 3 and the polishing surface 1a of the magnetic disk 1 are pressed against each other with a predetermined contact pressure, and the polishing finish is performed for a time of, for example, about 0.5 to 1.0 sec.

It should be noted that the polishing tape 3 is polished in the state of running in the direction opposite to the rotating direction of the magnetic disk 1 as in the above-described embodiment, or may be run in the same direction, or in the stopped state. However, it may be sent for each polishing.

Further, the magnetic disk 1 may be polished from below as well as from above, and when both sides are polished surfaces, both sides of the magnetic disk 1 may be simultaneously polished from above and below. At this time, another set of the air nozzles 4 and 5 and the feed mechanism for the polishing tape 3 is arranged. Also in this case, it is necessary to make the portion of the tip of the air nozzle that backs up the polishing tape on the rear side in the feeding direction of the magnetic disk be a tapered surface that forms 20 degrees or more with respect to the magnetic disk.

The gloss of the magnetic disk surface after polishing is inversely proportional to the surface roughness of the polished surface. Further, if the surface of the magnetic disk is rough, a gap is created between the magnetic head and the magnetic disk when the reproducing apparatus is inserted, which causes deterioration of characteristics such as output reduction. Therefore, by improving the gloss, the surface roughness of the magnetic disk is reduced and the characteristics of the magnetic disk are improved.

FIG. 5 is a diagram showing the relationship between the tip shape (the angle θ ₁ ) of the polishing tape backup air nozzle and the gloss. As shown in this figure, θ ₁ is 20 compared to the case where the pressurized air is jetted from the tip of a semicircular cross section as in the past.
The glossiness of the surface of the magnetic disk increases when the pressurized air is ejected from the tip formed in a tapered surface shape that forms a degree or more. Further, the glossiness is remarkably increased at a high rotation speed range of 2000 rpm to 3000 rpm as compared with a magnetic disk having a low rotation speed of 500 rpm, and the burnishing effect is improved.

That is, by forming the tip of the air nozzle for backing up the polishing tape on the rear side in the magnetic disk feeding direction into a tapered surface shape that forms 20 degrees or more with respect to the polishing surface, the gap between the polishing tape and the polishing surface can be maintained even at high speed rotation. An air layer is not formed on the surface, polishing efficiency is increased, and the glossiness of the polishing surface can be increased.

In addition to the above-mentioned embodiment, this apparatus can be applied to the case where the web-shaped magnetic material is burnished as shown in FIG. In the illustrated apparatus, when the web-shaped magnetic material 11 sent in the direction of arrow B by the guide rollers 12 and 12 is polished by the polishing tape 13, the pressure air is supplied by the polishing tape backup air nozzle 14 and the magnetic material backup air nozzle 15. Is gushed out. Attach the tip of the air nozzle 14 for backing up the polishing tape to the rear side in the feeding direction of the magnetic material 11.
By forming the taper surface shape 14a of 20 degrees or more, the burnishing efficiency can be increased similarly to the magnetic disk burnishing apparatus.

(Effects of the Invention) The burnishing device according to the present invention is formed in a tapered surface shape that forms 20 degrees or more with respect to the polishing surface and the portion of the tip of the polishing tape backup air nozzle that is on the rear side in the magnetic material feeding direction. Thereby, formation of an air layer between the polishing tape and the magnetic material polishing surface due to high-speed rotation of the magnetic material can be prevented. Therefore, even if the magnetic material is rotated at a high speed, the pressure contact between the polishing tape and the magnetic material is always maintained appropriately, and the efficiency can be improved by the high speed rotation.

[Brief description of drawings]

1 is an overall front view of a burnishing device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a drive mechanism omitted, FIG. 3 is a sectional view of a nozzle portion, and FIG. 4 is another embodiment. FIG. 5 is a perspective view showing an example, FIG. 5 is a view showing the relationship between the gloss of the polishing surface and the shape of the tip of the air nozzle, and FIG. 6 is a sectional view showing the main part of the conventional example. 1 ... Magnetic material, 1a ... Polishing surface 3, 13 ... Polishing tape 4, 14 ... Polishing tape backup air nozzle 4c, 14a ... Tapered surface 5, 15 ... Magnetic disk backup air nozzle 4a, 5a ... Air ejection port

Claims (1)

[Claims] 1. An air nozzle for backing up a polishing tape, which is provided so as to face a polishing surface of a magnetic material, and a backup material for a magnetic material, which is provided at a position facing the air nozzle for backing up the polishing tape with the magnetic material sandwiched therebetween. An air nozzle is provided, and a polishing tape is interposed between the polishing tape backup air nozzle and the polishing surface to move the magnetic material relative to the both nozzles and from the both nozzles toward the magnetic material. In a burnishing device configured to perform polishing of the polishing surface by ejecting pressurized air to bring the polishing surface and the polishing tape into pressure contact with each other, from the air ejection port of the tip portion of the polishing tape backup air nozzle. A portion of the magnetic material on the rear side in the feeding direction is formed in a tapered surface shape that forms 20 degrees or more with respect to the polishing surface. Burnishing and wherein the.