JP2003225850A - Polishing method and polishing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polishing method and a polishing machine capable of polishing the polishing surface of a work having different curvature radii in a longitudinal direction and in a short side direction crossing the longitudinal direction at right angles and having a concave surface in the short side direction without waviness and not requiring an auxiliary tool such as a polishing protector in polishing. <P>SOLUTION: This invention relates to the method for polishing the polishing surface having different curvature radii in the longitudinal direction and the short side direction crossing the longitudinal direction at right angles and having the concave surface in the short side direction. A column-shaped polishing wheel having a larger diameter than the total width of the polishing surface in the short side direction is employed. The column-shaped polishing wheel is rotated around an axial line while the axial line is set toward the longitudinal direction. The column-shaped polishing wheel and the polishing surface are relatively moved in the longitudinal direction to simultaneously polish the whole width in the short side direction of the polishing surface. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polishing method and a polishing machine for polishing a polishing surface such as a toric surface of a mold for an fθ lens.

[0002]

2. Prior Art and its Problems: fθ lens (mirror)
Is a so-called toric surface having different radii of curvature in the longitudinal direction (main scanning direction) of its surface (polishing surface) and the lateral direction (sub scanning direction) orthogonal to this longitudinal direction. Recently, a special toric shape whose radius of curvature in the sub-scanning direction differs in the main-scanning direction is being adopted.

Since such an fθ lens is usually formed by molding a synthetic resin material, its mold has a toric surface (special toric surface) in which the irregularities of the fθ lens are reversed. Examples of a polishing machine for polishing the polishing surface of a mold having such a toric shape include the following.

As an example, a spherical polishing tool is fixed to the tip of a rotary member that rotates at high speed around an axis, and the polishing tool is rotated at high speed while contacting the polishing surface to reciprocate in the longitudinal direction, and polishing is performed. The entire polishing surface is polished by gradually shifting the contact position with the surface in the lateral direction.

However, in this polishing machine, since polishing is performed while shifting the contact position between the polishing tool and the polishing surface in the lateral direction,
A small waviness is generated on the polished surface of the mold, which makes it impossible to manufacture an ideal fθ lens having no waviness on the lens surface.

As another example, a die is fitted in a fitting recess of a polishing tool (a jig) which is a die holding member so that the polishing surface of the die and the upper surface of the polishing tool are continuous. , A polishing tool (elastic ball polisher) made of a soft material with a diameter larger than the width of the polishing surface of the mold in the lateral direction is fixed to the tip of the rotating member that rotates around the axis at high speed, and this polishing tool is rotated at high speed. There is one in which the entire polishing surface is polished by bringing the polishing surface and the upper surface of the polishing toy into contact with each other while reciprocating in the longitudinal direction of the polishing surface.

However, in this polishing machine, since the polishing tool is soft and the frictional resistance between the polishing tool and the polishing surface is large, the polishing tool cannot polish the polishing surface while rotating at a high speed. It is impossible to completely remove the slight residual undulations, especially in the lateral direction. Furthermore, since a polishing toy is required for polishing, the cost of manufacturing and installing the polishing toy is a burden.

[0008]

It is an object of the present invention to polish a polishing surface of a work, which has a concave surface in the lateral direction and a radius of curvature different in the longitudinal direction of the polishing surface and in the lateral direction orthogonal to the longitudinal direction, without causing waviness. At the same time, it is an object of the present invention to provide a polishing method and a polishing machine that do not require auxiliary tools such as a polishing tool during polishing.

[0009]

SUMMARY OF THE INVENTION The polishing method of the present invention is a method for polishing a polishing surface in which the radius of curvature of the longitudinal direction is different from that of the transverse direction orthogonal to the longitudinal direction, and the transverse direction is concave. A cylindrical polishing tool having a diameter larger than the entire width in the lateral direction of the surface is used, and the cylindrical polishing tool is rotated about the axis with its axis oriented in the longitudinal direction, and polishing is performed with the cylindrical polishing tool. The surface is relatively moved in the longitudinal direction, and the entire width of the polishing surface in the lateral direction is polished at the same time.

By changing the inclination of the axis of the cylindrical polishing tool with respect to the normal to the polishing surface, it is preferable to change the radius of curvature of the polishing surface in the lateral direction that is polished by the cylindrical polishing tool.

The polishing machine of the present invention is a polishing machine for a work having a polishing surface in which the longitudinal direction and the lateral direction orthogonal to the longitudinal direction are different from each other in curvature radius and the lateral direction is concave.
A cylindrical polishing tool having a diameter larger than the entire width of the polishing surface in the lateral direction; polishing tool rotating means for rotating the cylindrical polishing tool around an axis; and the cylindrical polishing tool and the work polishing surface. Contacting / separating means for relatively moving in and out: Reciprocating moving means for relatively reciprocating the cylindrical polishing tool and the work polishing surface in the longitudinal direction of the polishing surface; Contacting / separating direction by the contacting / separating means And an angle adjusting means for adjusting an inclination angle formed by the axis of the cylindrical polishing tool and the normal to the polishing surface in a plane including the moving direction of the reciprocating moving means; By controlling the angle adjustment means,
Control means for controlling the polishing of the polishing surface by the peripheral portion of the tip surface of the cylindrical polishing tool.

Further, it is preferable that the control means controls the contacting / separating means to constantly press the polishing tool against the polishing surface with a constant pressure.

Further, it is preferable that the control means controls the contacting / separating means to constantly press the polishing tool against the polishing surface at a constant pressure.

Further, it is preferable that the work is a mold for manufacturing an fθ lens.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings. A substrate 1 having a rectangular shape in a plan view is fixed on the floor surface, and a slider 3 capable of reciprocating in the longitudinal direction of the substrate 1 is mounted on the upper surface of the substrate 1. The slider 3 is linked to a moving motor (reciprocating moving means) (not shown) through a driving force transmission mechanism that converts the rotational movement of the moving motor into a linear movement. By rotating the substrate 1, the substrate 1 linearly reciprocates.

On the upper surface of the slider 3, f (not shown) is shown.
A mold (work) 5 for manufacturing the θ lens is fixed. The polishing surface (work polishing surface) 5a, which is the upper surface of the die 5, has a concave curve both in the longitudinal direction X of the die 5 and in the lateral direction Y orthogonal to the longitudinal direction. It has a so-called toric shape in which the radii of curvature in the longitudinal direction X are different from those in the lateral direction Y.

The polishing machine 7 comprises the slider 3 and a machining center (not shown) to which a polishing device is attached. The polishing device has the following structure. On the slider 3, a support member 9 provided in the machining center and directed in the up-down direction is provided. This support member 9
An elevating motor (contacting / separating means) (not shown) rotates in both forward and reverse directions to ascend and descend in the Z direction. A horizontal columnar portion 9a is continuously provided at the lower end of the columnar portion 9a. A circular rotary plate 11 is provided on one side surface of the cylindrical portion 9
It is mounted rotatably around the central axis (B axis) of a.
An angle adjusting motor (angle adjusting means) (not shown) is incorporated inside the columnar portion 9a. The angle adjusting motor is linked to the rotary plate 11 so that the angle adjusting motor rotates in both forward and reverse directions. As a result, the rotary plate 11 rotates clockwise and counterclockwise.

On the side surface of the rotary plate 11, a columnar arm 13 having a large-diameter portion 13a and a small-diameter portion 13b is fixed while facing the radial direction of the rotary plate 11, and the arm portion 1
A rotation driving motor (polishing tool rotating means) (not shown) is built in the inside of the unit 3. The arm portion 13 faces the same direction as the longitudinal direction X of the mold 5 in a plan view and is positioned on the same straight line. Inside the arm portion 13, a spindle 15 oriented in the same direction as the arm portion 13 is attached rotatably around its axis, and the tip end of the spindle 15 has an arm portion 13
Protruding from the tip of. The spindle 15 is linked to a rotation driving motor, and when the rotation driving motor rotates, the spindle 15 rotates at high speed, for example, several hundreds to several thousands or tens of thousands of revolutions per minute.

A cylindrical cylindrical polishing tool 17 is fixed to the tip of the spindle 15. The diameter of the cross section of the cylindrical polishing tool 17 is larger than the width of the polishing surface 5a of the mold 5 in the lateral direction Y, and the radius thereof is smaller than the minimum radius of curvature of the cross section of the polishing surface 5a in the lateral direction Y. This cylindrical polishing tool 17
For example, it is manufactured by hardening felt, covering hard rubber with an abrasive sheet, or hardening vinyl chloride, and is harder such as buff.

Above the mold 5, a polishing liquid 19 is placed on the polishing surface 5.
A polishing liquid supply device 21 that constantly supplies a is provided.

The angle adjusting motor, the moving motor, and the elevating motor are connected to a control circuit (control means) (not shown) built in the machining center. This control circuit controls the angle adjusting motor, the moving motor, and the lifting motor based on NC data input in advance.
By controlling (numerical control), the peripheral edge of the tip surface 17a of the cylindrical polishing tool 17 is always brought into close contact with the polishing surface 5a at a constant pressure with no pressure from the start to the end of the polishing operation. . Specifically, the rotation direction and the rotation speed of the moving motor are controlled, and the polishing surface 5a in the longitudinal direction X and the up-down direction that changes according to the rotation of the moving motor.
According to the positional relationship between the cylindrical polishing tool 17 and the cylindrical polishing tool 17, the rotation speed and rotation direction of the lifting motor and the angle adjusting motor are controlled, and the vertical position of the cylindrical polishing tool 17 is finely adjusted. The peripheral edge of the front end surface 17a of 17 is constantly brought into contact with the polishing surface 5a at a constant pressure, and the angle θ between the horizontal plane H (see FIG. 2) and the spindle 15 is finely adjusted as shown in FIG. By changing the approximate radius of curvature of the peripheral edge of the tip surface 17a of the cylindrical polishing tool 17 when viewed from the X direction as described above, the tip surface 17a of the cylindrical polishing tool 17 is changed.
The peripheral edge of is always brought into close contact with the polishing surface 5a without any gap.

When the power of the machining center of the polishing machine 7 having the above structure is turned on and a cycle switch (not shown) is pressed, the angle adjusting motor, the moving motor, the lifting motor, and the rotary driving motor are activated, and The mold 5 linearly reciprocates along the longitudinal direction X, and the peripheral edge of the tip surface 17a of the cylindrical polishing tool 17 is constantly in rotary contact with the polishing surface 5a at a constant pressure, whereby the entire polishing surface 5a is polished. It During this period, the polishing liquid supply device 21 constantly supplies the polishing liquid 19 to the polishing surface 5a. When a predetermined time has elapsed after pressing the cycle switch, the cylindrical polishing tool 17 moves upward from the polishing surface 5a, and the linear movement of the slider 3 and the cylindrical polishing tool 17 are performed.
Then, the rotating operation of the rotating plate 11 and the rotating operation of the rotating plate 11 are stopped, and the polishing operation is completed.

As described above, the cylindrical polishing tool 17 can polish the polishing surface 5a while rotating at a high speed. Further, the cylindrical polishing tool 17 always polishes the polishing surface 5a with a constant pressure, and at the time of polishing, the polishing surface 5a. Is the longitudinal direction X with respect to the cylindrical polishing tool 17.
Since it moves only in the direction Y and does not move in the lateral direction Y, the entire polishing surface 5a of the die 5 can be polished without waviness. Particularly in the present embodiment, a relatively hard cylindrical polishing tool 1
Since 7 contacts the polishing surface 5a while rotating around the axis at a high speed, it is possible to effectively prevent the generation of undulations in the latitudinal direction Y of the polishing surface 5a, and it is possible to remove the undulations generated in the pre-processing. Furthermore, by rotating the moving motor at a high speed to move the slider 3 linearly at a high speed, it is possible to effectively prevent the occurrence of waviness in the longitudinal direction X of the polishing surface 5a.

Further, since an auxiliary tool such as a polishing toy is not required at the time of polishing, it is not necessary to manufacture and attach the polishing toy, which is advantageous in cost.

The diameter of the cross section of the cylindrical polishing tool 17 of this embodiment is larger than the width of the polishing surface 5a of the mold 5 in the lateral direction Y, but is the same as the width of the polishing surface 5a in the lateral direction Y. May be Further, even if the die has a straight or convex sectional shape in the longitudinal direction X of the polishing surface, it can be polished by the polishing machine 7. Further, the polishing machine 7 can be used also for polishing a toric work other than the mold 5 for manufacturing the fθ lens. Further, the support member 9 is indicated by an arrow A.
A horizontal movement motor (not shown) for reciprocating in the direction (direction parallel to Y) is provided and connected to the control circuit of the machining center so that the position of the support member 9 in the direction of arrow A can be adjusted. Good.

[0026]

As described above, according to the present invention, in the pre-processing, the polishing surface of a workpiece having a concave surface in which the radius of curvature is different between the longitudinal direction of the polishing surface and the lateral direction orthogonal to the longitudinal direction. The generated waviness can be removed, and polishing can be performed without causing waviness. Further, since auxiliary tools such as a polishing toy are not required at the time of polishing, it is advantageous in cost.

[Brief description of drawings]

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

FIG. 2 is likewise a side view showing a contact state between a polishing tool and a mold.

FIG. 3 is likewise a front view showing a change in the contact state between the polishing tool and the polishing surface of the mold.

[Explanation of symbols]

1 substrate 3 slider 5 Mold (work) 5a Polishing surface (work polishing surface) 7 polishing machine 9 Support members 9a cylindrical part 11 rotating plate 13 arms 13a large diameter part 13b Small diameter part 15 spindles 17 Cylindrical polishing tool 17a Tip surface 19 polishing liquid 21 Polishing liquid supply device H horizontal plane X Mold longitudinal direction Y die short side direction Z vertical direction

Claims (5)

[Claims] 1. A method for polishing a polishing surface in which the radius of curvature of the longitudinal direction is different from that of the lateral direction orthogonal to the longitudinal direction, and the lateral direction is a concave surface, and the entire width of the polishing surface in the lateral direction. A cylindrical polishing tool having a larger diameter is used, the cylindrical polishing tool is rotated about the axis with its axis directed in the longitudinal direction, and the cylindrical polishing tool and the polishing surface are relatively moved to each other. A polishing method comprising moving in the longitudinal direction and polishing the entire width of the polishing surface in the lateral direction at the same time. 2. The polishing method according to claim 1, wherein the inclination of the axis of the cylindrical polishing tool with respect to the normal to the polishing surface changes the polishing surface in the lateral direction to be polished by the cylindrical polishing tool. Polishing method with different radii of curvature. 3. A polishing machine for a work having a polishing surface in which the radius of curvature differs between the longitudinal direction and the lateral direction orthogonal to the longitudinal direction, and the lateral direction is a concave surface. Cylindrical polishing tool having a diameter larger than the entire width in the direction; polishing tool rotating means for rotating the cylindrical polishing tool around the axis; moving the cylindrical polishing tool and the work polishing surface relative to each other. Contacting / separating means: reciprocating moving means for relatively reciprocating the cylindrical polishing tool and the workpiece polishing surface in the longitudinal direction of the polishing surface; contacting / separating direction by the contacting / separating means and movement by the reciprocating means. Angle adjusting means for adjusting the inclination angle formed by the axis of the cylindrical polishing tool and the normal to the polishing surface within a plane including the direction; and controlling the contacting / separating means, the reciprocating means, and the angle adjusting means. do it,
And a control means for controlling the polishing of the polishing surface by the peripheral portion of the tip surface of the cylindrical polishing tool. 4. The polishing machine according to claim 3, wherein the control means controls the contacting / separating means to constantly press the polishing tool against a polishing surface at a constant pressure. 5. The polishing machine according to claim 3, wherein the work is a mold for manufacturing an fθ lens.