JPS5822654A - Method of grinding to obtain mirror finish - Google Patents

Abstract

PURPOSE:To finish efficiently a fine mirror surface which is high in the surface preciseness, by pressing and moving back and forth and to the right and left a grinding stone, whose undersurface is funnel-shaped, relatively to a work while the grinding stone is being rotated. CONSTITUTION:A work 25 is placed on a table 1 and is moved back and forth by a feed screw 11. The grinding stone 6 whose undersurface is funnel-shaped is provided at one end of a swinging body 4, is presses under a certain pressure by a balance weight 7 onto the work 25, and is driven by a motor 12 to rotate about a rotating shaft 5. The swinging body 4 is attached on a slider 2 to be able to swing about a bearing shaft 3, and is moved to the right and left by a feed screw 20. While the grinding stone 6 is rotated, when it is moved back and forth and to the right and left relatively, the ground surface will have a twilled pattern wherein fine arcs are crossed, and thus a high quality mirror surface can be obtained.

Description

[Detailed description of the invention] The present invention relates to a method for polishing interfacial surfaces.

Conventional polishing methods include bringing the flat surface of a disk-shaped rotating grindstone into contact with the workpiece and moving the grindstone, and bringing the circumferential surface of the disk-shaped rotating grindstone into contact with the workpiece. There are cases where the above-mentioned grindstone is moved.

The former method results in a polished surface with rough twill lines,
In addition, due to the surface contact, the peripheral speed of rotation is different between the outer circumferential portion and the central portion of the grinding wheel, so arcuate lines with different curvatures intersect on the polished surface, making it impossible to expect a clean finished surface.

The latter method also has the drawback that the polished surface has intermittent linear streaks, and as described above, a clean finished surface cannot be expected.

Furthermore, in any of the above methods, the corner edge of the grindstone collides with the object to be polished at the initial stage of cutting, so that there is a drawback that sag occurs.

In view of the above points, the present invention provides a polishing method that efficiently finishes a mirror surface with a clean surface and high precision.

An example of the implementation of the present invention will be described below based on the accompanying drawings.

The illustrated polishing machine A has a table that slides back and forth.
, a slider 2 that slides in the left-right direction behind the tape tv/, a rocking body q whose tip and end are positioned in the front-rear direction, and whose middle part is supported on the slider 2 via a support shaft 3; There is a next rotation shaft S which is pivoted to push downward at the tip of the oscillator q, a bottom funnel-shaped grindstone attached to the lower end of the rotation shaft S, and a movable adjustable grindstone provided on the oscillator q. It is configured by a balance weight 7.

The above table/ is placed on the top surface of the machine housing g,
It is configured to slide in the front-back direction by a female screw 2 and a male screw // driven by a reversible motor /θ.

The above-mentioned rocking body is formed by a box that is long in the front-rear direction, and there is a space between the pulley /3 of the motor /2 attached to the end of the rocking body and the pulley /lI of the rotation axis j. The power is transmitted by passing the TV is.

Furthermore, as shown in the figure, the balance weight 7 is provided with a male screw /7 driven by a motor /B on the upper surface of the oscillator g in the front-rear direction, and a female screw /g of the balance weight 7 is connected to this male screw /7. By screwing in, a locking device for the balance weight 7 is not required after the balance weight 7 is moved to a predetermined position.

The above-described slider 2 is adapted to be slid by a male screw 2θ driven by a reversible motor /9 and a female screw 2/ of the slider /2.

Further, the downward bushing attached to the rotating shaft S is constructed by incorporating a spring 23 into a bearing box 22 as shown in the figure, and connecting one end of the lower side of the spring 23 to a bearing 7 that is integral with the rotating shaft S! q and in contact with each other.

Note that the contact between the plate-shaped workpiece 2S placed on the tape /F// and the grinding wheel B is such that a twin wire connecting the center of the bottom surface of the grinding wheel B and one peripheral edge is formed on the plate surface of the workpiece 72j. It is meant to be in contact.

To explain the polishing method of the present invention using the above polishing machine, first, the workpiece is placed on the tape #/! Place S.

A line connecting the center of the bottom surface of the grinding wheel B and one peripheral edge is brought into contact with the upper surface of the workpiece 2j.

Fourth, move the balance weight 7 toward the tip of the floating body q so as to press the grindstone B onto the workpiece 2.5-.

Next, the motor/2 is started to drive the grindstone 6 together with the rotating shaft j, and the reversible motor/θ is operated to slide the tape Iv/ in the front and back direction using the male screw // and the female screw /2. By doing so, the workpiece 2S is polished.

The polished pattern at this time is a special twill pattern with intersecting fine arcuate lines, or loss pine lines.

The polishing position of the workpiece 2j is changed by operating the motor and sliding the slider 2 using the male screw 20 and the female screw 2/.

As described above, according to the polishing method of the present invention, a line connecting the center of the bottom surface and one circumference of the rotary grindstone whose bottom surface is funnel-shaped is brought into contact with the workpiece, and the tape μ is moved in the front-back direction and the slider is Since it is made to move in the left and right direction, the polished surface has a special twill pattern of intersecting fine arcuate lines, or loss pine lines.

Therefore, a beautiful polished surface can be obtained.

In particular, the bottom of the whetstone is funnel-shaped, and the line connecting the center of the bottom and one peripheral edge is brought into contact with the workpiece, so the corner edge of the whetstone will not collide with the workpiece during the initial grinding, unlike conventional methods. This eliminates the inconvenience of deep cuts.

Further, since the contact between the workpiece and the grindstone is a line contact, the rotational resistance of the grindstone is also reduced.

Furthermore, the balance weight applies a forward-downward weight to the oscillating body, and the spring applies a downward pressing force to the rotating shaft, so that the grinding stone is constantly pressed against the workpiece and no protrusions are formed on the workpiece. Even if there is, the surface of the protrusion can be used for polishing.

[Brief explanation of drawings]

FIG. 1 is a side view of a polishing machine used in the polishing method of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a longitudinal sectional side view showing the contact of a grindstone. A... polishing machine, /... tape/l/, , 2...
Slider, 3... Support shaft, q... Rocking body, S...
Rotating axis, 6... Grindstone, 7... Balance weight, g
...Kikan? ...female thread, /θ...motor, /
/...Male thread, /2...Motor, /3...Pulley, /Glue...Pool, 15...Belt, /6...
Motor, /7...male thread, /lr...female thread, /
9...Motor, 2θ...Male thread, K/...Female thread, 22...Bearing box, 23...Spring, 2q.
...Bearing, 25...Workpiece

Claims (1)

[Claims] a tape μ that slides in the front-rear direction; a slider that slides in the left-right direction behind the table; and a rocking body whose tip and end are positioned in the front-rear direction and whose middle part is supported by the slider via a support shaft; A polishing machine with a rotating shaft supported on the tip of the oscillating body so as to push downward, a bottom funnel-shaped grindstone attached to the lower end of the rotating shaft, and a balance weight whose movement is adjustable provided on the oscillating body. The line connecting the center of the bottom surface of the grindstone and one circumference is brought into line contact with the top surface of the workpiece placed on the table, and then the grindstone is driven and the tape /L/2!
1l-1 A mirror finish polishing method characterized by sliding a slider in the left-right direction to polish a twill pattern in which fine arcuate lines intersect.