JPH0482638A - Work piece holder structure of finishing machine - Google Patents

Abstract

PURPOSE:To make the centering easier and to carry out a holding work rapidly by composing one of holding rollers provided at the tube form holding member to hold a work piece concentrically in the condition to penetrate the work piece, drivable and rotatable, and providing a means to prevent the movement of the holding member in the axial direction. CONSTITUTION:The first holder 2 furnishes a holding member 21 having a tube form body 21a to hold a glass rod G conectrically in the condition to penetrate the glass rod G, and two hard rollers 22 and a rubber roller 23 to hold the holding member 21 rotatable by abutting on the peripheral surface 21b of the tube form body 21a, making the rubber roller 23 as a driving roller. A movement preventive means to the movement of the tube form body 21a in the longitudinal direction makes a flange 21c provided at the opposite side of the machining tool 4 of the tube form body 21a abut to an air bearing 25 to prevent machining tool 4, and makes a rubber holding roller 26a abut to the flange 21c to prevent the movement of the tube form body 21a to the opposite side of the machining tool 4.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is directed to holding a long workpiece and rotating the workpiece around an axis along the longitudinal direction of the workpiece. The present invention relates to a workpiece holding part structure of a processing machine that processes.

[Conventional technology]

Conventionally, in the structure of the workpiece holding part of the above-mentioned processing machines, the workpiece is held against a chuck attached to the end of a rotating drive shaft, for example, as seen in lathes. Ta.

[Problem to be solved by the invention]

However, in the above-mentioned conventional structure, since the chuck is attached to the end of the drive shaft, it is inappropriate to hold a long workpiece due to space constraints in the axial direction. Moreover, when holding the workpiece on the chuck,
Since it is necessary to perform centering work to accurately align the rotational axis of the workpiece with the axis of the drive shaft, it is time-consuming to attach and detach the workpiece to and from the chuck, reducing overall work efficiency. was.

An object of the present invention is to provide a workpiece for a processing machine that is suitable for holding a long workpiece, that allows easy centering of the workpiece, and that allows the workpiece to be held in the processing machine quickly. The object of the present invention is to provide a holding part structure.

[Means to solve the problem]

In order to achieve the above object, the characteristic structure of the workpiece holding part structure of the processing machine according to the present invention includes a cylindrical holding member that holds a long workpiece concentrically with the long workpiece passed through it. , a holding roller is provided which contacts the outer peripheral surface of the holding member to rotatably and removably hold the holding member; at least one of the holding rollers is configured to be rotatable; A movement preventing means is provided for preventing movement in the axial direction.

[For production]

According to the feature of the present invention, the holding member holds the workpiece in a state where it passes through the workpiece, so even if the workpiece is long, it can be held without any problem. This holding member holds the workpiece concentrically with respect to the cylindrical outer circumferential surface, and the centering operation is performed, for example, by rolling the holding member along the outer circumferential surface of the held workpiece. This can be easily done by adjusting to eliminate center runout of the workpiece.

This holding member is supported by a holding roller and rotates along its outer circumferential surface. By attaching and supporting the member to the holding roller, the held workpiece can be rotated without center runout. Moreover, since the holding member is detachable from the holding roller, a plurality of holding members holding workpieces can be prepared in advance, and the work of holding the workpiece can be carried out quickly.

Since at least one of the holding rollers is configured to be rotatable and is provided with a movement preventing means for preventing movement of the holding member in the axial direction, the holding member can be used in a normal processing machine. Similar to the chuck in , it can be driven and rotated at a predetermined position in the longitudinal direction of the workpiece.

〔Effect of the invention〕

As described above, the present invention provides a processing machine that is suitable for holding long workpieces, and that can easily center the workpiece and quickly perform the work of holding the workpiece with respect to the processing machine. It has now become possible to provide a structure for holding a workpiece, thereby making it possible to improve the working efficiency and processing accuracy of a processing machine.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 5 shows a lens processing machine (1) for manufacturing fine lenses by non-contact polishing the tip of a long and narrow glass rod with a diameter of about 2 mm or less.

This processing machine (1) includes a first support stand (3) equipped with a first holding part (2) that holds a glass rod (G) as a workpiece;
a processing tool (4) for processing the glass rod (G);
A second support base (6) equipped with a second holding part (5) for holding the processing tool (4), a drive mechanism (A) for driving and rotating the glass rod (G), and this drive mechanism. (7), and a third support stand (8) that supports the first to third support stands (7);
3), (6), and (8) are attached to the base (9).

The first support stand (3) is horizontally divided into upper and lower halves, and includes a holding part-side divided body (10) having the first holding part (2) and a base fixed to the base (9). It consists of a stand-side divided body (11). As will be described later, the first holding section (2) holds the glass rod (G) with its longitudinal direction aligned horizontally.

As shown in FIG.
1a) and this cylindrical body (21).
the holding member (21b) in contact with the outer circumferential surface (21b) of
) two hard rollers (22) rotatably holding the
(22) and a rubber roller (23).

The rubber roller (23) is a driving roller, and has a downward biasing mechanism (24) on the holding part side divided body (lO).
) is pressed through ). Moreover, the cylindrical body (21a
) in the longitudinal direction is a cylindrical body (2
The flange (2) provided on the opposite side of the processing tool (4) in 1a)
1c) is brought into contact with the air bearing (25) f fixed to the holding part (11J divided body (10)), and the cylindrical body (
21a) from moving toward the processing tool (4), and
A rubber presser roller (26a) provided with a sideways biasing mechanism (26) is brought into contact with the flange (21c) to prevent the movement of the cylindrical body (21a) to the side opposite to the processing tool (4). configured to prevent it.

As shown in FIGS. 1 to 3, the holding member (21) has a groove (21d) for holding the glass rod (G).
The holder (21e) is formed into a 7-shaped cross section along the longitudinal direction of the cylindrical body (21a), and the glass rod (G) is placed in a groove (
A cover (21f) which closes the groove (21d) while being installed inside the cylindrical body (21d) is inserted into the inside of the cylindrical body (21a). Then, the glass rod (G) is held by tightening and holding the holding body (21e) and the lid body (21f) with a plurality of long screw bolts (21g) screwed into the cylindrical body (21a). It is held concentrically with respect to the member (21). The long bolts (21g) are arranged at two locations separated in the longitudinal direction of the cylindrical body (21a).
The glass rod (G) is in contact with the holder (21e) from three sides and also in contact with the lid (21f), so that the attitude of the glass rod (G) with respect to the cylindrical body (21a) can be completely adjusted. .

As shown in FIGS. 1 and 2, the downward biasing mechanism (24) pushes the roller support member (24a) that supports the shaft of the rubber roller (23) toward the holding section side divided body (1).
a first spring (24b) that supports the roller supporting member (24a) upwardly and downwardly with respect to the holding part side divided body (10) and supports the roller support member (24a) in a vertically movable manner with respect to the holding part side divided body (10); A second spring (24C) is provided to bias the rubber roller (23) downward with the most stable linearity. In addition, each of these springs (24b) and (24C) has two adjustable springs 24d.
) and (24e), the urging force can be adjusted individually, and by weakening this urging force, the holding member (21) can be attached or removed.

As shown in FIGS. 1 and 3, the sideways biasing mechanism (
26) generally includes attaching an upper pressing member (26b) having the pressing roller (26a) to a lower pressing member (26c), and attaching this lower pressing member (26c) to the holding section side divided body ( 10), which are slidably inserted into two first slide shafts (26d), (26d) and a second slide shaft (26e) which are supported in a dual-supported state.

Linear ball bearings (26f), (26f) are interposed between the first slide shafts (26d), (26d) and the lower pressing member (26c), while the second slide shaft (26e) ) and a ring (26g) that is engaged with the enlarged portion formed at one end of the lower pressing member (26c).
A third spring (26h) is interposed between the flange (21c) and the presser roller (26a) with its lateral biasing force. This third splash (26h)
The biasing force caused by the adjusting screw (26i) moves the ring (26g) via the second slide shaft (26e).
) can be adjusted. Moreover, the upper pressing member (2
6b) is removably attached to the lower pressing member (26c) with fitting portions (26j) that fit into each other.

As shown in FIG. 5, the base-side divided body (11) further includes first to fourth divided bodies (lla), (llb), (
IIC).

(lid), and the holding part side divided body (10) is moved along the longitudinal direction of the glass rod (G) with a screw feed mechanism (12), and the tip of the glass rod (G) is connected to the processing tool. Direction of distance movement (X) for distance movement relative to (4)
It can be moved and operated by another thread feeding mechanism (not shown).

) and two other directions (Y), CZ) that are orthogonal to each other.
It can also be moved and operated.

The holding part side divided body (10) and the fourth divided body (lid) are connected so as to be relatively movable along the distance movement direction (X), and further, the holding part side divided body (10) A stopper (14) is provided to restrict the movement of the lid at a predetermined position relative to the fourth division body (lid).

That is, with such a configuration, the holding part side divided body (l
O) moves relative to the fourth divided body (lid) in a direction opposite to the processing tool (4) only when the glass rod (G) starts to come into contact with the processing tool (4). .

A switch (not shown) that is turned ON when the stopper (14) and the holding portion side divided body (10) come into contact with the stopper (14) is in contact with the stopper (14). A contact detection means (not shown) is provided which has a contact detection means (not shown) and an electric circuit for detecting a state switching point at which the switch changes from OFF to ON. That is, by this contact detection means, the glass rod (G
) and the processing tool (4), when the screw feed mechanism (12) is used to move the glass rod (G) a little away from the processing tool (4), the glass rod (G) It is possible to detect contact with the processing tool (4).

A motor (15) is mounted on the upper part of the second support stand (6), and the second holding part (
5), the processing tool (4) is attached and held. This processing tool (4) is made of a cylindrical body with a fixing flange (4a) at the base end, and has a tapered surface (4b) on the inner periphery of the distal end, the diameter of which increases at the distal end. The abrasive liquid is configured to flow into the through hole (4c) penetrating from the base end to the tip end from the motor (15) side. Moreover, the second support stand (6) has, between its lower end and the base (9),
The tip of the processing tool (4) is configured to be operable to rotate around the vertical axis.

The drive mechanism (7) drives the rotation of the servo motor (7a) supported by the third support base (8) to the rubber roller (7C) via an Oldham joint (7b) and a universal joint (7C). 23). The third support stand (8) is the first support stand (3
), the servo motor (7a) is configured to be movable in two directions, and the rod (7d) between the universal joints (7C) is configured to be expandable and retractable by an internal linear ball bearing. It is.

Next, a procedure for attaching and holding a workpiece to the workpiece holding section of the processing machine described above will be explained.

First, the glass rod (G) is placed in the groove (21d), and the lid (21f) is held from above.
21d), and one side of the lid (21f) and the groove (21d) are closed.
d) contacting the glass rod (G
) to hold. Next, the holding member (21) is rolled along the outer peripheral surface (21b) of the cylindrical body (21a), and each of the long threaded bolts (
21g) for centering with respect to the outer peripheral surface (21b). The holding member that holds the glass rod in this way (
21) is inserted into the air bearing (25), and the rubber roller (23) and presser roller (26a) are caused to function as described above by the respective biasing mechanisms (24) and (26).

At this time, in order to prevent the flange (21C) from being pressed too much by the presser roller (26a) and the cylindrical body (21a) tilting with respect to the hard roller (22), the downward biasing mechanism (24) and the sideways Adjust the urging force with the urging mechanism (26). In this way, the holding of the glass rod (G) to the held portion of the processing machine is completed.

On the other hand, to replace the held glass rod (G),
Is it okay to perform the operation in reverse to the above procedure?
When replacing the glass rod (G) for 1), as long as the glass rod (G) has the same diameter, only the long bolt (21g) that comes into contact with the lid (21d) should be replaced. It is sufficient to loosen and tighten. Therefore, the glass rod can be replaced quickly and accurately. In addition, the groove (21d) of the glass rod (G) installed inside the groove (21d)
) by measuring the distance from the bottom of the glass rod (G)
It is also possible to detect errors in roundness.

Next, a method of polishing a fine lens using the processing machine (1) described above will be explained with reference to FIGS. 3 and 4.

During processing, the processing tool (4) and the glass rod (G) are arranged so that their respective central axes (P) and (Q) are within one plane. The processing tool (4) is rotated at a high speed of about 5,000 to 110,000 rl, and the through hole (
Among the abrasive liquid (16) spouted from 4C), abrasive grains with heavy specific gravity form an abrasive grain layer (17) along the tapered surface (4b) side due to centrifugal force. In the present invention, the tip of the glass rod (G) is polished into a spherical shape by bringing the glass rod (G) into contact with the abrasive layer (17) rotating at high speed without rotating it in a vertical position. Therefore, the glass rod (G) and the tapered surface (4b) are not in contact with each other.

Here, assuming that the abrasive layer (17) is thin and homogeneous, approximately A ground and polished spherical surface expressed as can be obtained.

Note that θ is the distance between the tapered surface (4b) and the central axis of the processing tool (
P), C is the maximum diameter of the tapered surface (4b), and A is the angle between the maximum diameter of the tapered surface (4b) and the central axis (Q) of the glass rod (G) and the tapered surface. (4
b) The distance to the intersection with the center axis of the processing tool (4) (
The value measured along the P) direction, t is the thickness of the abrasive grain layer (17).

In order to separate the tip of the glass rod (G) from the tapered surface (4b) by a distance t, the screw feeding mechanism (12) is used.
to adjust the glass rod (G) to the tapered surface (4b).
After making contact with the screw, it is preferable to reversely operate the screw feed mechanism (12) until the predetermined amount t is displayed on the position display device.

In addition, by operating another screw feeding mechanism, the glass rod (G) can be moved in the direction (Y) along the tapered surface (4b), and thereby, as expressed in the above formula, The radius of curvature R of the lens can be adjusted. In addition, in order to make the central axis (Q) of the glass rod (G) orthogonal to the tapered surface (4b), the second support base (6) may be adjusted by rotating. In order to adjust the position of the glass rod (G) in the vertical direction (Z) perpendicular to the plane of the paper, it is sufficient to operate another screw feeding mechanism.

[Another example]

Next, other embodiments of the present invention will be listed.

(B) In the above embodiment, the cylindrical body (21a)
The flange (21c) provided on the presser roller (26
a) to prevent the holding member (21) from moving in the axial direction, or the cylindrical body (21a)
A groove is formed in the circumferential direction of the hard roller (2).
2) and (22) may be brought into contact within this groove to prevent the holding member (21) from moving in the axial direction.

(b) In the above embodiment, the downward biasing mechanism (
By weakening the biasing force of the holding member (24),
1), the holding member (21) may be attached and detached without weakening the biasing force of the downward biasing mechanism (24).

(c) The application of the present invention is not limited to a lens polishing machine, but can be applied to any processing machine such as a lathe.

Note that although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings by the reference numerals.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, FIG. 1 is a longitudinal sectional view showing the structure of the workpiece holding part of the processing machine, FIG. 2 is an enlarged front view of the holding member, and FIG. FIG. 4 is a plan view showing the structure of the workpiece holding part of the processing machine, FIG. 4 is a cross-sectional view showing the polishing state of a lens by a processing tool, and FIG. 5 is a side view of the lens processing machine. (G)...Workpiece, (21)...Holding member, (21b)...Outer peripheral surface, (22),
(22), (23)... Holding roller, (2
6)...Movement prevention means.

Claims (1)

[Claims] A workpiece of a processing machine that holds a long workpiece (G) and processes the workpiece (G) by rotating the workpiece (G) around an axis along its longitudinal direction. The holding part structure includes a cylindrical holding member (21) that concentrically holds the workpiece (G) in a penetrating state, and a cylindrical holding member (21) is provided on the outer peripheral surface (21b) of the holding member (21). Holding rollers (22), (22), and (23) are provided which abut and hold the holding member (21) rotatably and removably, and the holding rollers (22), (22), and (23) are provided. At least one of them is configured to be rotatable and the holding member (21)
movement prevention means (
26) Workpiece holding part structure of a processing machine provided with.