JPS61203263A - Machining method of spherical member - Google Patents

Abstract

PURPOSE:To machine plural spherical members highly accurately and efficiently by holding a work in an annular V-groove etched in lower lap then applying vibration onto any one of upper or lower lap. CONSTITUTION:A work 15 is fitted in V-groove 17 then positioned through a holding board 16 to have constant interval. Then the upper lap 12 is mounted on the work 15 to apply predetermined lapping pressure on the work 15 together with a weight 40. Furthermore, lapping agent such as diamond powder is fed through a through-hole 20 to V-groove 17 while motors 28, 34 are started to rotate the lower lap 11 in the arrow 43 direction while the upper lap 12 in the arrow direction 44. When rolling in V-groove 17, the work 15 will contact with three points on the opposite sidewall faces of V-groove 17 and the underface of the upper lap 12 and since the lapping speeds at three points are different, slip motion is produced resulting in spherical face lapping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sphere processing method for simultaneously lapping a plurality of spheres, and is not particularly limited thereto.

This invention relates to a sphere processing method suitable for processing spheres made of ceramics.

[Technical background of the invention and its problems]

Spheres are widely applied in various technical fields as constituent elements of various devices, and spheres made of ceramics are particularly attracting attention for their use in special purposes due to their corrosion resistance, heat resistance, and abrasion resistance. In general, regardless of whether the sphere is made of ceramic or not, it is required to have good sphericity and a predetermined diameter, so a processing device suitable for this is required. Therefore, for a relatively large sphere, 1 in - times
In many cases, individual spheres are processed, but relatively small spheres <
Therefore, it is desirable to simultaneously process a large number of spheres at once.

Figure #c2 is an example of this, in which a steel disc-shaped upper lap plate (2) is coaxially opposed to a steel disc-shaped lower lap plate (1) K, and these lap plates (11, (A holding plate (3) that supports the spherical workpiece (S) in a removable manner is arranged between 2j and 2j. The spherical workpiece (S) is formed on the same circumference of the holding plate (3). A plurality of the grooves are supported by the supporting portion, and fit into the V-shaped annular groove (1a) of the lower lap plate (1).

It rolls in the annular groove (1a) due to the rotation of the lap plates (1) and (2) and the pressure applied via the upper lap plate (2), and during this time, the lap agent is supplied from the outside. Polished.

However, in the above-mentioned conventional sphere processing method.

Since the polishing conditions differ depending on the placement position of the workpiece (S)..., variations in processing accuracy occur. Therefore,
To obtain a precise sphere, the workpiece (S)
Because it is necessary to change the position of...

Not only does this seriously reduce work efficiency, but it is also an obstacle to automation.

[Object of the Invention] An object of the present invention is to obtain a sphere processing method that can process a plurality of spheres with high precision and high efficiency.

[Summary of the invention]

In spherical processing, in which the workpiece is held in a circular V-shaped groove carved in the lower wrap, and lap pressure is applied by the upper wrap to lap the workpiece into a sphere, at least the upper wrap or the lower wrap is used. Vibration is applied to either one of the wraps.

[Embodiments of the invention]

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

FIG. 1 shows a sphere machining device used in the sphere machining method of the embodiment. This device consists of a steel disc-shaped lower wrap αυ, a steel circular upper wrap (13) placed on the lower wrap housing υ, and a lower lap support that rotates and excites the lower wrap housing υ. The mechanism (13), the upper lap rotation drive mechanism I that rotationally drives the upper lap @, and the coarse spherical workpiece (L) interposed between the lower lap αυ and the upper lap (L)
! 9, and a lapping agent supply mechanism (not shown) that automatically supplies the lapping agent to the processing area (not shown).

The lower wrap (11) has a plurality of V-shaped grooves αη concentrically formed in multiple stages.

A side wall side for regulating the movement of the upper wrap α2 is provided on the upper surface peripheral edge of the lower wrap (11J) to protrude upward. ) is loosely inserted into the enclosed space.On the other hand, the upper wrap (Iz) has a flat lower surface and a single rotation axis I coaxially protrudes from the upper surface. This rotating shaft α1 is provided with a through hole (to) that opens on the lower surface, and the lapping agent can be supplied to the polishing area through the through hole. 19 is attached to a cylindrical casing-shaped frame installed on the floor part Qυ and a mounting part (c) formed by bending inward at the upper end of this frame ■, and facing in the direction of the arrow. A plurality of biasing compression springs (C)..., an annular support plate (C) which is attached to the upper end of these compression springs (E) and bent into a stepped shape, and this support. It consists of a rotary drive part (5) that is locked and fixed inside the plate (to).The rotation drive part is rotated by a compression spring (c) through a support plate (c). It is elastically supported and can freely vibrate in three-dimensional direction.The rotation drive section (5) is.

The motor (C), the flange (7) which is wrapped around the cylindrical exterior body of the motor (C) and directly fixed to the support plate 2, and the lower end of the rotating shaft (01) of the motor (C) are connected to each other. and an unbalance weight (9) which adds vibration of a predetermined amplitude to the motor (c) itself. The lower wrap (11) is coaxially connected to the upper end of the rotating shaft Gυ of the motor (c). On the other hand, the upper wrap rotation drive mechanism C14) is connected to the frame (
23tc The upper end of the motor (b) of the cylindrical holding stand (to) installed adjacent to the floor 121) Ic, and the motor (b) fixed to the upper end of this holding stand (to). A reducer (to reduce the rotational speed of the rotating shaft of the motor)
c), and an eccentric pulley (b) that is eccentrically mounted around the free end of the drive shaft protruding from the reducer (to);
The rotation axis a of the upper wrap circle is a pulley coaxially attached to the upper end of the intestine, the belt cI is wound between the eccentric pulley η and the pulley (to), and the rotation axis α is A cylindrical weight that applies appropriate lapping pressure to the workpiece (tcJ) fitted in the V-shaped groove r17) of the lower wrap (11) through the upper wrap αa. (7), and a compression spring (6) whose one end is locked to this weight 00 and the other end is locked to a fixing member (not shown) to elastically urge the upper wrap α2 in the direction of the arrow (41a). ).

Next, the sphere processing method of this embodiment will be described using the sphere processing apparatus having the above configuration.

First, the workpiece (l!19) is placed in the V-shaped groove (17)...
... are fitted together, and positioned at a constant distance from each other using the holding plate αe. Next, the workpiece a9.
...Place the upper rug (1) on top, and
At the same time, a predetermined lapping pressure is applied to the workpiece storage. Next, a lapping agent such as diamond powder is supplied to the V-shaped groove αD through the first through hole, and at the same time, the motor (to) is supplied.

By starting the lower wrap (Iυ) in the direction of arrow 03 and the upper wrap (l) in the direction of arrow (l), the upper wrap (l) rotates the eccentric pulley ( Due to the action of the compression spring (6) and the arrow (41),
It reciprocates in the (41b) direction. Tsumashi, bottom wrap (L
The rotational axis of the upper wrap [3 is constantly fluctuating with respect to the rotational axis of υ. on the other hand.

The lower wrap υ irregularly vibrates minutely due to the action of the unbalanced weight (to) and the compression spring (c).

Thus, when the workpiece (151) rolls inside the ■-shaped groove η..., it is in contact with three points: the both side wall surfaces of the ■-shaped groove circle... and the lower surface of the upper lap α. However, the above 3
Since the lapping speed for turning on and off is different, the workpiece (19.
A sliding motion occurs between ... and the wrap αυ, (1). Along with this sliding motion, a spherical wrap is performed.

In addition, because the rolling axis of the workpiece (L) constantly changes due to the sliding movement, the workpiece (L) is lapped as a whole, and gradually approaches a true sphere from a rough ball. Furthermore, in addition to this kind of lapping action, the workpiece is...
K is determined by the micro-vibration of the lower wrap υ and the change in transfer speed caused by the eccentric movement of the upper wrap (l) working together.
The wrapping conditions for ... have been made uniform.

There is almost no variation in the amount removed by polishing due to differences in placement position on the bottom lap. the result.

It goes without saying that the accuracy of sphere machining is significantly improved.

This eliminates the hassle of changing the machining position of the workpiece α9...), improves machining efficiency, and makes it suitable for automation.

In the above embodiment, the upper wrap α3 is made to reciprocate, but it is not made to reciprocate.

It is also possible to perform only normal rotational movement.

In this case, the upper wrap a2 may be connected to the rotating shaft of a motor provided upwardly and movably, without using the bell) 01, and may be driven to rotate.

Alternatively, the upper lap a3 may be kept stationary relative to the lower lap 1υ, and the workpiece (1!9...K lap pressure may simply be applied to it.Conversely, the lower lap αυ may be kept stationary relative to the lower lap 1υ). It may be reciprocated with respect to the lap α3.Furthermore,
The method of applying vibration to the lower wrap αυ is not limited to the above-described embodiment, and any method may be used, such as adding ultrasonic vibration. Alternatively, the upper wrap (12) side may also be vibrated without applying vibration to the lower wrap αυ side.Alternatively, the vibration may not be applied to the lower wrap (11) side.
Only the upper lap α2 may be vibrated.

〔Effect of the invention〕

The sphere machining method of the present invention corrects variations in lap conditions due to differences in machining positions by adding vibration to the lap, and can process one sphere with high precision and efficiency, making it suitable for automation. It becomes what it is. In particular, one aspect of the present invention is
It is particularly effective when applied to processing ceramic spheres where variations in lapping conditions are likely to occur.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a sphere machining apparatus used in a sphere machining method according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional sphere machining method. αυ: Lower rough flap Sumi 7J: Upper lap. Inclination: Workpiece, (27-shaped groove of l. Agent: Patent attorney Noriyuki Chika (and 1 other person) Figure 2! Ku 1

Claims (2)

[Claims] (1) The above V of the lower wrap where the V-shaped groove is carved in an annular shape.
A step of holding a workpiece to be polished into a sphere in the shape groove, and compressing the workpiece held by the lower wrap with the upper wrap, and at least the lower lap of the upper wrap and the lower wrap. a step of rotating the workpiece; and a step of supplying an abrasive to the workpiece and polishing the workpiece with the upper lap and the lower lap; A sphere processing method characterized by applying vibration to at least one of the lower wraps. (2) The method for processing a sphere according to claim 1, characterized in that the upper wrap is relatively reciprocated along the V-shaped grooved surface of the lower wrap.