JPS61163285A - Forming method of dynamic pressure generating groove - Google Patents

Abstract

PURPOSE:To form a dynamic pressure generating groove high in precision and quality by using a cylindrically shaped rotary roller to print the corrosion resistant ink for an axial body 2 and etching a nonprinted part. CONSTITUTION:An axial body 2 is axially supported by the supporting axial rollers 4 for the axial body and the spheres 16 for the supporting axes are provided to both end faces of the axial body 2. The supporting frames 10 and a printing mold 18 are moved by interlocking them with the rotation of the axial body 2. The printing mold 18 consists of the screen meshes performed with the electroless Ni plating and a required shape is masked thereon. The corrosion resistant ink 22 is fed to a feed roller 20 contacting with the printing mold 18 and passed through a print part of the printing mold 18 to reach the axial body 2 and stuck on the parts other than a shape of a dynamic pressure generating groove formed on the axial body 2. The axial body 2 printed with the corrosion ink 22 is etched by a method such as the etching to form the required dynamic pressure generating groove on the axial body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method for forming dynamic pressure generating grooves in a shaft body for a fluid bearing.

[Conventional technology]

Conventionally, the dynamic pressure generating groove of a shaft body for a hydrodynamic bearing has been formed as described below.

For example, as shown in FIG. 4, when it is desired to provide a so-called Hering zone-shaped dynamic pressure generating groove 4 on the outer peripheral surface of the cylindrical shaft body 2, a method as shown in FIGS. 5 and 6 is used. A dynamic pressure generating groove was formed using this method. Note that Figure 5 is a front view, and Figure 6 is a side view.

As shown in the figure, the cylindrical shaft body 2 is rotatably supported by four rotatable shaft body support rollers 6 with flanges. Also 1. As shown in FIG. 6, a printing mold 8 and a support frame 10 are provided which linearly move in the direction of the arrow in conjunction with the rotational movement of the shaft body 2 in the direction of the arrow. The printing mold 8 is provided with a desired shape of the dynamic pressure generating groove to be formed in the shaft body 2 as a non-printing part. As the printing mold 8, a mold made of a fine mesh printing screen with a resin sheet attached only to the non-printing part is used. This printing mold 8 is attached to a support frame 10. Further, on the side opposite to the shaft side of the printing mold 8, a flat plate-like blade 14 for supplying corrosion-resistant ink, which holds the corrosion-resistant ink 12 at its tip and has a rectangular shape, is disposed, and is connected to the support frame 10 and the printing mould.
8 moves and the shaft body 2 rotates, the corrosion-resistant ink 12 held at the tip of the flat blade 14 reaches the outer circumferential surface of the shaft body 2 through the printing part of the printing mold 8, and the shaft body 2 rotates. By rotation, a portion other than the desired shape of the dynamic pressure generating groove is printed on the outer peripheral surface.

Next, by etching the portion of the shaft body 2 on which the corrosion-resistant ink 12 is not printed, a dynamic pressure generating groove of a desired shape is formed.

[Problem that the invention seeks to solve]

However, the conventional printing screen mentioned above uses stainless steel or synthetic resin thread with a wire diameter of 50 to 200 μ as a material, so it is weak in strength, and when printing, it is difficult to use a flat blade. This may cause the printing screen to sag. In addition, when the shaft is supported by a flanged roller, the shaft may shift in the axial direction during printing rotation. For this reason, the joints may become misaligned during printing,
The shapes of the dynamic pressure generating grooves were also irregularly printed, making it impossible to obtain the desired shape, and the shapes often had to be corrected after printing.

[Purpose of the invention]

It is an object of the present invention to eliminate the drawbacks of the above-mentioned conventional examples, eliminate misalignment of joints during printing, and provide a high-precision, high-quality, inexpensive method for forming dynamic pressure generating grooves. be.

[Failure to solve the problem]

In order to achieve the above object, the present invention is characterized in that ink is supplied during printing using a rotating roller having a cylindrical shape and rotatably supported.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the method for forming dynamic pressure generating grooves according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the method for forming dynamic pressure generating grooves according to the present invention, and FIG. 2 is a side view thereof.

As shown in the figure, a shaft 2 having a cylindrical shape is rotatably supported by four shaft support rollers 4 having a cylindrical shape. Furthermore, rotatable spindle balls 16 are provided on both left and right end surfaces of the shaft body 2.

Also, when the shaft body 2 rotates in the A direction,
A support frame 10 and a printing mold 18 are provided for movement in the direction. The printing mold 18 has the same configuration as in the conventional method described above. That is, in order to mask the part of the fine mesh-like printing screen corresponding to the desired dynamic pressure generating groove shape, a sheet made of resin is used to adhere only to this part as a non-printing part. . Further, as shown in the figure, on the side opposite to the shaft side with the printing die 18 in between, there is a
A corrosion-resistant ink supply row 220 having a cylindrical shape and rotating in the C direction is provided in contact with the printing mold 18 .

Furthermore, corrosion-resistant ink 22 is supplied between the corrosion-resistant ink supply roller 20 and the printing mold 18 so as to be uniformly spread over the printing mold 18.

The corrosion-resistant ink 22 applied to the corrosion-resistant ink supply row 220 passes through the printing portion of the printing mold 18 when the printing mold 18 moves and the shaft body 2 and the corrosion-resistant ink supply row 220 rotate. The anti-corrosion ink 22 that has passed through the printing mold 18 reaches the shaft 2 and adheres to a portion of the shaft 2 other than the desired shape of the dynamic pressure generating groove.

In this way, the shaft body 2 with the portions other than the desired shape printed with the anti-corrosion ink 22 is corroded by a method such as etching, and the desired dynamic pressure generating grooves 4 are formed in the shaft body 2.

The printing screen for printing mold 18 has a wire diameter of approximately 40 mm.
A mesh screen made of ~50μ thread can be used, and by applying electroless nickel phosphorus plating to a thickness of 10 to 20μ, the hardness of this plating is as high as 400 or less. The screen is reinforced and is effective in preventing the printing mold from sagging during printing.

FIG. 3 is a front view similar to FIG. 1 showing another embodiment of the method of the present invention.

In this embodiment, a material having a large friction coefficient, such as rubber 24, is attached to the support frame 10 so as to be in contact with the shaft 2, and this causes friction between the printing mold 18 and the shaft 2 during printing. can be prevented.

In the method of the present invention, damage to the printing mold can be prevented by using a soft roller 20, such as one made of silicone rubber, for supplying corrosion-resistant ink.

〔Effect of the invention〕

As described above in detail and concretely, according to the present invention, by providing a cylindrical rotating roller in place of the conventional rectangular blade, stretching and sagging of the screen can be suppressed. The durability of the printer is improved, there is no slippage of the joints during printing, and high-efficiency, large-volume printing is possible, leading to significant cost reductions.

[Brief explanation of the drawing]

FIG. 1 is a front view of an apparatus for carrying out the method of forming dynamic pressure generating grooves according to the present invention, FIG. 2 is a side view thereof, and FIG. A front view of the device, and FIG. 4 is a perspective view of the shaft body having dynamic pressure generating grooves.
FIG. 5 is a front view of an apparatus for carrying out a conventional method for forming dynamic pressure generating grooves, and FIG. 6 is a plan view thereof. 2... Shaft, 4... Shaft support roller, 10... Support frame, 16... Sphere for spindle, 18... Printing mold, 20
... Corrosion resistant ink supply roller, 22... Corrosion resistant ink. Agent Patent Attorney Jo Taira Yamashita Figure 1, 2nd Flash

Claims (3)

[Claims] (1) A cylindrical shaft body is rotated while being in contact with a printing mold using a screen mesh plated with electroless nickel phosphorus, in which the desired shape is masked, and a cylindrical shape is formed through the printing mold. A shaft body for a fluid bearing, characterized in that corrosion-resistant ink is printed on the non-formed portion of the shaft body using a rotating roller, and then the non-printed portion, which becomes the molded portion of the dynamic pressure generation groove, is corroded. A method of forming dynamic pressure generating grooves. (2) Molding of the dynamic pressure generating groove according to claim (1), characterized in that a material having a large friction coefficient is provided on a part of the support of the printing mold so as to be in contact with the shaft body. Method. (3) The two shafts are free to rotate by contacting both end surfaces thereof.
A method for forming a dynamic pressure generating groove according to claim (1), characterized in that the groove is supported pivotally by a sphere and a roller that rotates in contact with the outer surface of the groove.