JP3052408B2 - Honing equipment for glass tubes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a honing apparatus for an inner surface of a hole, and more particularly to a honing apparatus for processing a glass tube or a ceramic tube which is a hard-to-cut material.

[0002]

2. Description of the Related Art For example, a glass capillary used for butt connection of optical fibers needs to be finished with a high tolerance with a small tolerance to the inner diameter of the outer diameter (about 0.1 mm) of the optical fiber. However, since it is impossible to drill holes by mechanical means, a pilot hole is usually drilled in a large-diameter solid glass rod, and the inner peripheral surface of the pilot hole is subjected to honing. After that, it is formed into a main pipe for a connector by applying a lapping finish, and thereafter, is supplied to a redrawing (redrawing) step, and is stretched under heating to form a final pipe having a predetermined outer diameter and a predetermined hole diameter. Finished into a product.

[0003] The main pipe for the connector has an outer diameter of 60 mm, for example.
The dimensional specifications are set to an inner diameter of about 7 mm and a length of about 1000 mm, but it is necessary to select honing processing conditions and lapping processing conditions to meet the dimensional accuracy required for the final product. In particular, since the grinding conditions of the prepared hole in the honing process have a decisive effect on the dimensional accuracy of the final product, it is necessary to pay attention to appropriate supply of the grinding fluid and prevention of rotational runout of the grinding tip. Conventional honing equipment
The honing tool is fixed to the tip of the tool spindle, and the grinding fluid is poured from above, or the tool is hollow and blows out from the tip of the tool.

[0004]

When the internal surface honing of a difficult-to-cut material such as glass or ceramics is performed with a conventional fixed tool, concentric grinding marks are formed on the internal surface of the hole.
In addition, since the grinding fluid is injected from the upper part of the hole or exits from the tip of the processing tool, it does not run around to the grinding part, and also the removal of grinding powder is not performed well, and the finishing accuracy is low. It was causing the decline.

[0005]

As a means for solving the above-mentioned problems, the present invention has an outer diameter longer than a glass tube or the like, and having an outer diameter smaller than the inner diameter of the glass tube or the like. Forming a grinding fluid supply path to the side, a tool spindle that is positively driven to rotate, a support means such as a glass tube, and a straight line that relatively moves the tool spindle and the support means such as a glass tube in the axial direction. It has a feed mechanism and an outer diameter slightly larger than the inner diameter of the glass tube, etc., has a plurality of grinding fluid escape grooves along the longitudinal direction on the outer circumference, and forms a handle with a diameter smaller than the inner diameter of the glass tube, etc. at the rear end Grinding tip, the base is fixed to the tip of the tool spindle, the outer peripheral surface of the tip is slightly smaller than the inner diameter surface of a glass tube or the like to form an annular flow gap for forming a fluid bearing, and
An appropriate number of grinding fluid ejection holes for ejecting grinding fluid from inside toward this gap are formed radially through the outer peripheral surface of the tip, and further, a recess is formed at the tip, and the inside diameter of the recess is determined by a grinding tip. The outer diameter of the handle is larger than the outer diameter of the handle, and the handle of the grinding tip is swingably joined to this tip recess, and the grinding fluid is supplied from the tool spindle to the grinding tip between the handle and the tip recess. The honing device for glass tubes and the like was constituted by the universal joint having the annular flow path formed therein.

[0006] Further, a rotation applying means such as a glass tube may be added to a supporting means such as a glass tube.

[0007]

The rotation of the tool spindle with the grinding tip attached to the tip via a universal joint is carried out from one end of the glass tube to the other end in the hole of the glass tube. During this time,
The grinding fluid is always supplied through the inside of the tool spindle. At this time, the grinding tip is joined to the tool spindle via the universal joint, so that the honing state in which vibration from the rotation drive unit is not transmitted to the grinding part continues. In addition, the grinding fluid sent from the tip of the tool spindle through the annular flow path for supplying the grinding fluid flows into the clearance groove provided on the outer periphery of the main body of the grinding tip, and performs the cooling and the washing-off function of the grinding powder. . Further, a part of the grinding fluid passes through the grinding fluid ejection hole from within the tool spindle into an annular flow gap formed between the hole formed in the glass tube or the ceramic tube and the cylindrical outer peripheral surface of the universal joint. By being supplied, a fluid bearing function is generated between the glass tube or the ceramic tube and the tip of the tool spindle, and the rotational runout of the grinding tip is suppressed.

Further, if the glass tube is rotated, the processing efficiency is improved.

[0009]

【Example】

[First Embodiment] A specific example in which the present invention is applied to a honing device for preparing a pilot hole of a glass tube used as a connector of an optical fiber communication device will be described.

A main part of the honing apparatus (1) is formed along a longitudinal direction of a chip body (3) in the form of a mounting cone.
Grinding tip (2) in which the grooves of the grinding fluid escape grooves (3A), (3B), (3C), and (3D) are formed in a circumferentially equidistant state, and a core serving as a fitting fixing member for the grinding tip (2) The handle (7A) of the material (7) is constituted by a universal joint (6) that is swingably connected and supported to the tip of the tool spindle (4) via a spring pin (5). The main body (3) of the grinding tip is formed by shaping a mixture of diamond particles and metal powder into a conical shape and by pressure sintering around a core material (7) with a flange (FIG. 1B). And (C) enlarged grinding fluid escape grooves (3A) (3B) (3)
C) It is formed on a rotary honing tool with (3D). The universal joint (6) is shown in FIG.
As shown in the figure, the tip portion is formed in a cylindrical concave portion,
The handle (7A) of the grinding tip (2) is fitted into the recess (8), and the handle (7A) having a pin hole (7B) larger in diameter than the spring pin (5) and the handle (7A). Between the wall (6A) of the joint (6) and the pin hole (7B), a small-diameter spring pin (5) is driven while leaving an appropriate gap, whereby the grinding tip (2) is hollow. It is swingably connected and supported to the tip of a tool spindle (4) made of a tube material.

By providing a difference in diameter between the rear end of the handle (7A) of the grinding tip (2) and the concave end (8) of the universal joint (6), the grinding tip (2) is provided.
A first annular portion for supplying a grinding fluid whose flow direction is indicated by an arrow F1 is provided between the concave portion (8) of the universal joint (6) extending toward the side and the handle (7A) of the grinding tip (2). A channel (9) is formed. On the other hand, when viewed from the concave end (8) of the universal joint (6), two grinding wheels having a diameter of about 1 mm are provided at a position close to the tool spindle (4) with a phase difference of about 180 ° in the circumferential direction. A liquid ejection hole (10) is formed, and a corresponding hole is formed between a pilot hole (11A) formed in the glass tube (11) and the cylindrical outer peripheral surface (12) of the universal joint (6). In the meantime, the flow direction of the grinding fluid is indicated by an arrow F2 as a constituent means of the fluid bearing.
Annular flow gap (13) is provided. This gap (13) is, for example, about 50 μm. The tool spindle (4) is formed of, for example, a hollow stainless steel tube having an outer diameter of 6 mm and an inner diameter of 4 mm, and functions as a flow path for the grinding fluid, and a male screw provided at the tip thereof is connected to a universal joint (6). ) Is screwed with a female screw provided at the base end, whereby a grinding fluid is applied to the grinding tip (2), which is swingably joined and supported via a spring pin (5) having a diameter of about 1.5 mm. As shown in FIG. 1A, it is configured to be able to supply and transmit the rotational driving force from the motor with inverter (14).

To transmit the rotational driving force from the motor with inverter (14) to the grinding tip (2), a three-jaw chuck (15) is provided between the motor with inverter (14) and the tool spindle (4). A rotating joint (16) is mounted. The rotary joint (16) rotatably supports the base end of the tool spindle (4) via an O-ring (22), and supplies grinding fluid to the body of the tool spindle (4) via a nipple into the tool spindle (4). A tap water pipe or a water supply pump (17) for pumping is connected.

As shown in FIG. 1 (A), the tool spindle (4) is positioned via a steady rest (20A) with the grinding start end of the grinding tip (2) positioned above the grinding end side. The upper slide guide (1
It is rotatably supported between 8) and the lower slide guide (19). On the other hand, in the glass tube (11), a pilot hole (11A) having a diameter larger than the outer diameter of the tool spindle (4) and smaller than the outer diameter of the main body (3) of the grinding tip (2). )
The diameter difference between the body (3) of the grinding tip and the pilot hole (11A) is used for the honing allowance by the grinding tip (2). The outer peripheral surface of the glass tube (11) is disposed between the upper slide guide (8) and the lower slide guide (19) in a state where the tool spindle (4) passes through the prepared hole (11A). The clamper is supported by the clampers (20) and (21), thereby constituting a linear drive system that can slide non-rotatably along the axial direction of the tool spindle (4) during honing. More specifically,
The support member (26) of the clampers (20) and (21) is integrally joined to the ball nut (23) with the axial direction of the support member (26) aligned with the inclination direction of the tool spindle (4) on the upper slide guide (18) side. The ball nut (23) is screwed with a ball screw (24) arranged so as to be parallel to the axis of the tool spindle (4) to constitute a linear feed means. The steady rest (20A) is integrally connected to a part of the support member (26).

An output shaft of a motor (not shown) is connected to one end of the ball screw (24). On the other hand, at the end of honing, universal joint (6)
Is exposed to the outside of the lower opening of the glass tube (11), so that the grinding tip (1) flows from the first annular flow path (9) and the second annular flow gap (13) indicated by arrows F1 and F2. 2) Grinding fluid escape grooves (3A) (3B) (3C) (3)
It becomes difficult to flow the grinding fluid into D). In order to avoid such inconvenience at the end of honing, a grinding fluid supply head (25) having a bottomed cylindrical shape is fitted and fixed to the upper opening of the glass tube (11), and the grinding fluid supply head ( The second grinding liquid supply means is constituted by connecting a second tap water pipe or a water supply pump (not shown) to 25).

FIGS. 2 and 3 show a specific example of the honing apparatus shown in FIG. 1. In FIG. 2, the same components as those shown in FIG. 1 are indicated by the same reference numerals in principle. Description is omitted. In the honing device (1) for processing a prepared hole in the glass tube (11) shown in FIGS. 2 and 3, the supporting frame (31) is provided on the fixed frame (33) via supporting legs (32) and (35) having different heights. ), And a motor (14) with an inverter for rotationally driving the grinding tip (2) is provided on the lower end side of the support frame (31).
And a motor (2) for linearly feeding the glass tube (11).
7) and a speed reducer (28) are arranged to constitute a power transmission device. Further, a first sensor (29) for detecting the end of the linear feed of the glass tube (11) is provided on a bracket supporting the upper end in the longitudinal direction of the ball screw (24). A second sensor (30) for detecting the start of linear feeding of the glass tube (11) is provided on the bracket supporting the lower end in the direction, thereby restricting the length of the linear sliding section of the glass tube (11). I have. At the upper end of the support frame (31), a supply tank (34) for a lapping liquid to be used in a lapping step after the completion of the honing is provided. The lapping liquid supply tank (34) is generally of a type having a built-in stirrer to prevent sedimentation of the abrasive grains, and this supply tank is shown by a pipe (36) in FIGS. As described above, it is also possible to divert the grinding fluid into the grinding fluid supply head (25) attached to the starting end side of the grinding operation of the glass tube (11) at the honing stage.

The operation sequence of the honing apparatus (1) shown in FIGS. 1 to 3 will be described below. The glass tube (11) is fitted on the tool spindle (4) with the base end of the tool spindle (4) supported by the steady rest (20A). Glass tube (1
In 1), the outer peripheral body is clamped by the clampers (20) and (21).
By positioning the support member (26) of the clampers (20) and (21) near the second sensor (30) for detecting the start of linear feed, the screwing position between the ball nut (23) and the ball screw (24) is increased. Is located on the free end side of the tool spindle (4). At this time, the main body (3) of the grinding tip (2)
The inclined blade surface is concentrically arranged with respect to the tool spindle (4) with the inclined blade surface being close to the open end of the glass tube (11). In this state, the motor with inverter (14) is started to transmit the rotational driving force to the grinding tip (2) via the tool spindle (4) and the universal joint (6), and is supplied from the water supply pump (17). A grinding fluid is introduced into the tool spindle (4). At the same time, the motor (27) for linear feed is started, and the rotational driving force is transmitted to the ball screw (24) via the speed reducer (28). As a result, the glass tube (11) receives the rotational grinding force of the grinding tip (2) while moving in the non-rotational state along the axial direction of the ball screw (24), whereby the glass tube (11) is placed under the glass tube (11). The surface of the hole (11A) is subjected to high-precision honing. In this honing, the body (3) of the grinding tip (2), which was initially located on the free end side of the tool spindle (4)
Continues until it reaches a position where it comes out of the lower end opening of the glass tube (11), that is, until the end of the honing processing of the glass tube (11) is detected by the first sensor (29). During the honing process, the tool spindle (4)
The universal joint (6) and the grinding tip (2), which are swingably attached to the tip of the rotating tip, rotate.
Rotates under the continuous supply of the grinding fluid in the prepared hole (11A) of the glass tube (11), and a grinding error ± 0.00
Honing with high accuracy of 5mm or less. At this time, the grinding tip (2) is a universal joint (6)
The vibration from the motor with inverter (14) is connected to the tool spindle (4) via the grinding tip (2).
The honing state, which is not transmitted to the main body (3), is maintained. On the other hand, the grinding fluid supplied from the rotary joint (16) and the tool spindle (4) passes through the first annular flow path (9) as shown by F1, and the relief grooves (3A) (3) of the grinding tip (2).
B) It flows into (3C) and (3D) and exhibits cooling and washing-off functions of grinding powder. Further, the continuous flow of the grinding fluid is formed in the second annular flow gap (13), so that the inner peripheral surface of the pilot hole (11A) of the glass tube (11) and the outer peripheral surface of the universal joint (6). And a fluid bearing function is generated between them, and the rotational runout of the grinding tip (2) is suppressed.
At the start of the honing process, the grinding fluid is pumped from the rotary joint (16) side at a predetermined pressure, for example, a delivery pressure of 0.5 kg / cm2, and the main body (3) of the grinding tip (2) is attached to the glass tube (11). At the end of the honing process in which the universal joint (6) approaches the lower end opening and is exposed to the outside of the glass tube (11), it is difficult to form the flow paths F1 and F2. It is pressure-fed into the pilot hole (11A) via the grinding fluid supply head (25) attached to the starting end side of the grinding operation of (11). The honing apparatus (1) shown in the first embodiment has a case in which one prepared hole (11A) is formed in the axis of the glass tube (11) and a case in which the hole is formed on a cross section of the glass tube (11). It can be used both when two or more pilot holes (11A) are drilled.

[Embodiment 2] In the second embodiment shown in FIG. 4, in order to improve the honing speed of the glass tube (11), both the linear feeding operation and the rotation operation are applied to the glass tube (11). ing. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description of the same items will not be repeated.

The glass tube (11) is fitted and positioned inside the clamping sleeve (46) concentrically with the tool spindle (4).
The clamper (20) (21) having more than one set screw is fixed integrally with the clamping sleeve (46). The clamping sleeve (46) is fixed to the support member (26) via support brackets (44) and (45) with ball bearings (47) and (48) mounted on the respective ends thereof. The glass tube (11) is integrated with the clamping sleeve (46) by screwing a ball nut (23) attached to the upper end of the ball nut (23) with a ball screw (24) in the axial direction of the tool spindle (4). It is constituted so that it can be moved to. On the other hand, a motor (40) is fixed to the lower surface of the support member (26),
A first pulley (41) is fixed to the output shaft. Correspondingly, a second pulley (42) is attached to the outer peripheral surface of the clamping sleeve (46) by using an appropriate fixing means such as a key, and the first pulley (41). A wrapping power transmission member (43) such as a timing belt is mounted between the second pulley (42) and the second pulley (42). When this honing machine (50) is started,
The glass tube (11) is given a linear motion along the axial direction of the tool spindle (4) and a rotary motion by a motor (40). As a result, the honing speed of the pilot hole (11A) is increased as compared with the first embodiment in which only the non-rotating linear motion is given to the glass tube (11).

In the first and second embodiments, an example of processing a prepared hole (11A) of a glass tube (11) used as a connector for an optical fiber is described. Can also be used for applications. For example, it can also be used as a honing apparatus for a prepared surface of a ceramic tube which is a difficult-to-grind material. The honing apparatus (50) according to the second embodiment can be used when a pilot hole (11A) is formed in the axis of the glass tube (11).

[0020]

According to the first aspect of the present invention, a plurality of grinding fluid relief grooves are formed on the outer peripheral surface of the grinding tip, and these grinding fluid relief grooves are formed in a ring shape of a universal joint prepared as a support member for the grinding tip. By communicating with the channel,
The function of cooling the processing part and the outflow of the grinding powder is improved, and a kind of fluid bearing function is generated between the inner peripheral surface of the hole and the outer peripheral surface of the universal joint. As a result, as a synergistic effect of the two functions, the accuracy of honing the inner peripheral surface of the glass tube or the like is remarkably improved.

According to the second aspect of the invention, in addition to the above effects, the processing efficiency can be further improved.

[Brief description of the drawings]

1A is a schematic front view of the apparatus of the present invention, FIG. 1B is an enlarged longitudinal sectional view of a main part of the apparatus of the present invention, and FIG. 1C is a cross section of the grinding tip along line CC in FIG. FIG.

FIG. 2 is a front view showing a first specific example of the device of the present invention.

FIG. 3 is a plan view of the device shown in FIG. 2;

FIG. 4 is a front view showing a second specific example of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Honing machine 2 Grinding tip 3 Grinding tip main body 3A, 3B, 3C, 3D Relief groove of grinding fluid 4 Tool spindle 6 Universal joint 9 Annular flow path of grinding fluid 10 Grinding fluid ejection hole 13 Annular flow gap of grinding fluid 50 Honing equipment

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-78497 (JP, A) JP-A-2-106268 (JP, A) JP-A-48-59489 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) B24B 33/02 B24B 33/08

Claims (2)

(57) [Claims] 1. A grinding fluid supply path from a base end side to a tip end side is formed at a central portion, having an outer diameter longer than a glass tube or the like and smaller than an inner diameter of the glass tube or the like. A rotationally driven tool spindle, a support means such as a glass tube, a linear feed mechanism for relatively moving the tool spindle and a support means such as a glass tube in the axial direction, and an outside slightly larger than the inner diameter of the glass tube or the like. A grinding tip with a diameter, a plurality of grinding fluid escape grooves along the longitudinal direction on the outer circumference, and a shank with a handle smaller than the inner diameter of the glass tube etc. formed at the rear end, and a base fixed to the tip of the tool spindle The outer peripheral surface of the tip is slightly smaller than the inner diameter surface of the glass tube or the like to form an annular flow gap for forming a fluid bearing, and an appropriate number of grinding fluids for jetting the grinding fluid from inside toward the gap. A jet hole is formed radially through the outer peripheral surface of the tip, and A concave portion is formed in the concave portion, and the inner diameter of the concave portion is made larger than the outer diameter of the handle portion of the grinding tip. And a universal joint having an annular flow path for supplying a grinding fluid from a tool spindle to a grinding tip. 2. A honing apparatus for a glass tube or the like, wherein a rotation applying means such as a glass tube is added to the support means for the glass tube or the like according to claim 1.