JPH09290354A - Inner surface finishing device for small tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner surface finishing device that can efficiently eliminate hard burrs generated to at the inner bottom part of a small tube when a bottom part cover body is stuck to the small tube. SOLUTION: This inner surface finishing device is provided with a polishing tool 10 inserted in a small tube 1 from one open end of the small tube 1 clamped to a device body by clamp mechanism 4, a driving shaft 8 for transmitting rotary-driving force to the polishing tool 10, and a motor 5 fixed to the device body and having a rotor shaft connected to the base end part of the driving shaft 8 through connecting mechanism. The small tube 1 is clamped to the device body by the clamp mechanism 4 so that one open end is positioned at an upper part and the other closed bottom part is positioned at a lower part, and constituted in such a way that a polishing solution can be filled from one open end of the small tube positioned at the upper part. The polishing tool 10 is rotatory-driven by the rotatory-driving force of the motor 5 through the driving shaft 8 to polish the inner surface part of the small tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has one open end,
The present invention relates to a thin tube inner surface finishing device for polishing the inner bottom portion of a thin tube having the other end closed to form a bottom portion, and particularly to a hard burr generated on the inner bottom portion when the bottom lid is attached to the thin tube. The present invention relates to an inner surface finishing device that can be efficiently removed.

[0002]

2. Description of the Related Art For example, a thermocouple protection tube containing a thermocouple therein is entirely made of ceramics. In this ceramic thin tube, for example, as shown in FIG. 7, the thin tube 1 has an outer diameter D of about φ8 mm to φ12 mm, and an inner diameter d of about φ6 mm to φ7 mm. Therefore, the wall thickness of the tube is about 1 mm to 2 mm, and the total length L thereof is formed into a long length of about 600 mm to 1300 mm, which is extremely fragile. Moreover, in order to seal the bottom portion (tip portion) of the thin tube 1, the sealing thickness t is 1.5 mm to the bottom portion.
The lid 2 having a size of about 3 mm is attached with an adhesive. By sticking the lid body 2 to the bottom of the thin tube 1, the adhesive ceramics may be squeezed out on the inner surface of the thin tube 1 or, for example, when silicon-impregnated silicon carbide is used as the ceramic, the silicon as an impregnating agent is blown out. A protruding burr is generated due to.

In the presence of such burrs, the thermocouple contained in the tube is damaged, or the impregnating agent causes a chemical reaction in a high temperature environment to corrode the thermocouple. The problem occurs.

In general, when finishing the inner surface of a pipe-shaped ceramic tube in which both ends are open and the lid is not attached to the bottom of the thin tube, the abrasive particles pass through the inner surface of the thin tube by passing the abrasive particles with high pressure air. A means for spraying and thereby polishing the inner surface of the thin tube is adopted. However, in the above-mentioned thin tube having a sealed bottom portion, it is generally impossible to employ the above-mentioned means, and it is generally effective to polish the inner surface portion of the thin tube that is thin and long and is easily damaged. It was impossible.

[0005]

In order to polish the inner surface portion of the thin tube as described above, it is conceivable to form, for example, a long grindstone and use this, but to form such a long grindstone. However, there is a technical problem in that when a long grindstone is rotated at a high speed, vibration is generated and a ceramic thin tube as a workpiece is damaged.

The present invention has been made in order to solve the above-mentioned conventional technical problems, and it is possible to efficiently polish the inner surface of a thin tube made of ceramics such as silicon-impregnated silicon carbide that is easily damaged. An object of the present invention is to provide an inner surface finishing device for thin tubes.

[0007]

The inner surface finishing device for a thin tube according to the present invention, which has been made to achieve the above object, has an inner surface of a thin tube in which one end is opened and the other end is closed to form a bottom portion. A device for finishing an inner surface of a thin tube for polishing a portion, comprising: a clamp mechanism for mounting the thin tube to a device body; and an open end of the thin tube clamped to the device body by the clamp mechanism. A polishing tool to be inserted into a thin tube, a drive shaft for transmitting a rotational driving force to the polishing tool, and a rotor shaft fixed to the main body of the apparatus, the rotor shaft of which is connected to a base end portion of the drive shaft. The capillary is clamped to the main body by a clamp mechanism such that one open end is located at the upper part and the other closed bottom is located at the lower part, and the capillary is located at the upper part. Do With one polishing fluid from the open end of the tube is configured to be able to inject, by the rotational driving force of the motor, the polishing tool is rotated through the drive shaft,
The inner surface of the thin tube is polished.

Here, a plurality of the clamping mechanisms are provided for clamping the apparatus main body at a plurality of positions in the longitudinal direction of the thin tube, and the clamping mechanism for clamping one open end side of the thin tube is the longitudinal direction of the thin tube. It is preferably attached to the main body of the apparatus so as to be movable in any direction.

It is preferable that guide pieces made of a flexible material are attached to the drive shaft at a plurality of positions in the longitudinal direction so that the drive shaft does not contact the inner wall of the thin tube.

Further, it is preferable that a pressure mechanism is further provided for axially pushing up the bottom portion of the thin tube clamped to the apparatus main body by the clamp mechanism. Further, it is preferable that the polishing tool is composed of a cylindrical grindstone, and a groove is formed on a side surface of the grindstone facing the inner bottom portion of the thin tube.

According to the thin-tube inner surface finishing apparatus of the present invention constructed as described above, the thin tube as a workpiece is clamped to the apparatus main body by the clamp mechanism. Then, the drive shaft inserted into the thin tube is rotationally driven by the rotation of the motor, and the grindstone as a polishing tool, which is formed in a cylindrical shape, is rotationally driven by the rotation of the drive shaft. The inner surface of the thin tube is polished by the rotation of this cylindrical grindstone, and the burr is generated by attaching the lid to the bottom of the thin tube, or the protruding burr is generated by the blowing out of the impregnating agent such as silicon. Can be removed.

In this case, the clamping mechanism clamps the open end of the thin tube on the upper side and the closed bottom of the other side on the lower side of the apparatus body. The polishing liquid can be injected from one of the open ends, so that the polishing property of the grindstone can be improved and the life can be extended.

The drive shaft housed in the thin tube has
Since the guide pieces made of a flexible material are attached at a plurality of positions in the longitudinal direction, the problem that the drive shaft does not contact the inner surface of the thin tube and the fragile thin tube is damaged does not occur. Furthermore, by further providing a pressurizing mechanism that pushes up the bottom of the thin tube clamped to the main body by the clamp mechanism, the bottom of the thin tube is pushed up, and the grinding stone as a polishing tool is pressed against the bottom bottom of the thin tube at an appropriate pressure. Can be contacted with.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the basic structure of an inner surface finishing apparatus for thin tubes according to the present invention. In FIG. 1, an inclined table 3 which constitutes the main body of the apparatus has a substantially right-angled triangular shape when viewed from the side surface, and on the inclined surface portion 3a of the inclined table 3 as shown in FIG. For example, a clamp mechanism 4 for holding the thin tube 1 formed of ceramics is arranged.

As will be described later in detail, the structure of the clamp mechanism 4 is plural in the longitudinal direction of the thin tube 1 so as to hold the thin tube 1 in a substantially straight line along the inclined surface portion 3a of the tilt table 3 (see FIG. 1 is two). And the thin tube 1
Are clamped on the inclined surface portion 3a of the tilt table 3 by the respective clamp mechanisms 4 so that one open end 1a is located at the upper portion and the other bottom portion 1b closed by the lid body 2 is located at the lower portion. .

The motor 5 is located above the slope 3a.
The motor 5 is mounted by a mounting bracket 6 of a mold, and a clamper 7 as a connecting mechanism for detachably holding a drive shaft described later is mounted on a rotor shaft 5a of the motor 5. The rotor shaft 5 of the motor 5 is driven by the clamper 7.
A long drive shaft 8 whose one end is detachably coupled to a
Is formed of a steel material such as a piano wire. At the other end of the drive shaft 8, a tube-shaped joint 9 made of a relatively flexible material such as a plastic material is attached.

Further, a support shaft 10a having a diamond-shaped grindstone 10 as a polishing tool, which is formed in a cylindrical shape, is attached to the end of the joint 9, and the grindstone 10 as the polishing tool 10 is rotated by the rotation of the motor 5. Are configured to be rotationally driven. The drive shaft 8, the joint 9, and the grindstone 10 linearly coupled to the rotor shaft 5a of the motor 5 are inserted into the thin tube 1 through one open end 1a of the thin tube 1, and the grindstone 1
The side surface of the end portion of 0 is configured to be in contact with the bottom portion 1b closed by the lid body 2. A slit (groove) 10b is formed on the side surface of the end of the grindstone 10. By providing the slit 10b, the processing (polishing) efficiency can be improved.

Further, the drive shaft 8 is provided with guide pieces 11 formed in a tubular shape by a flexible material such as a plastic material at a plurality of positions in the longitudinal direction thereof. The presence of 11 prevents the drive shaft 8 from directly contacting the inner wall of the thin tube 1.

Further, there is further provided a pressurizing mechanism 12 for axially pushing up the bottom portion of the thin tube 1 clamped to the apparatus main body by the clamp mechanism 4. Although the structure of the pressurizing mechanism 12 will be described in detail later, the bottom portion of the thin tube 1 is pushed up in the axial direction so that the grindstone 10 as a polishing tool is attached to the thin tube 1.
By contacting the bottom portion 1b of the above with a proper pressure, hard burr existing on the bottom portion 1b of the thin tube 1 is caused to be removed by polishing by the rotation of the grindstone 10. A control board 13 is arranged on the front surface of the tilt table 3 which constitutes the main body of the apparatus. By operating a timer set knob (not shown) on the control board 13, the motor 5 is driven to rotate for a predetermined time. It is configured to be.

In order to polish the bottom of the thin tube using the thin tube inner surface finishing device constructed as described above, first, the one end 1a of the thin tube 1 is connected to the drive shaft 8, the joint 9, and the grindstone 10 to form an integral body. Insert the unit and attach the thin tube 1 to the clamp mechanism 4.
Is placed. Then, the drive shaft 8 protruding from the open end 1a of the thin tube 1 is held by the clamper 7 attached to the rotor shaft 5a of the motor 5. Then, the clamp mechanism 4 is operated to hold the thin tube 1 by the clamp mechanism 4.

After that, the pressurizing mechanism 12 is advanced toward the bottom of the thin tube 1 and is set so as to push the bottom of the thin tube 1 in the axial direction. In this state, the polishing processing liquid 14 is injected into the thin tube 1 from the open end 1a of the thin tube 1, and the timer 5 is operated by operating the timer set knob arranged in the control panel 13, so that the motor 5 is set to the timer set knob. The rotation is continued for the predetermined time set by. Therefore, the cylindrical grindstone 10 that is in contact with the bottom portion 1b of the thin tube 1 is rotationally driven by the rotation of the motor 5 via the drive shaft 8, and the grindstone 10
The burr existing on the bottom portion 1b of the thin tube 1 is polished and removed by the rotation of.

The rotation of the motor 5 is stopped after a predetermined time set by the timer set knob has elapsed. In this state, the pressing mechanism 12 is retracted from the bottom of the thin tube 1, and the drive shaft 8 is removed from the clamper 7 attached to the rotor shaft 5a of the motor 5. Furthermore, the clamp mechanism 4
Is released and the open end 1a of the thin tube 1 is turned up, the thin tube 1 is removed from the clamp mechanism 4, and the integrated unit including the drive shaft 8, the joint 9 and the grindstone 10 is pulled out upward, and then the inside of the thin tube 1 is pulled out. The inner surface of the thin tube is finished by returning the polishing liquid filled in the container to a storage can (not shown) or the like.

FIG. 2 is a side view showing the detailed structure of the inner surface finishing device for a thin tube according to the present invention, with a part of its longitudinal direction omitted, and FIG. 2 (a) shows the left side of the device. ,
(B) shows the right side. Further, FIG. 3 shows a configuration as seen in a direction of an arrow from a portion AA in FIG. 2, and FIG.
2 shows the configuration seen from the BB portion in the arrow direction, and FIG. 5 shows the configuration seen from the CC portion in FIG. 2 in the arrow direction. 2 to 5, the same parts as those in FIG. 1 are designated by the same reference numerals, and therefore detailed description thereof will be omitted.

2 and 3, the pressure mechanism 12 is mounted on the main body of the apparatus via the slide guide 21. The slide guide 21 is provided with a long hole 21a. By loosening the knob-attached bolt 21b inserted into the long hole 21a, the pressing mechanism 12 has the long hole 21a.
The pressure mechanism 12 is fixed at that position by tightening a knob bolt 21b.

The pressurizing mechanism 12 attached to the slide guide 21 has a hollow cylinder portion 12a,
An end cap 12b attached to one end of the cylinder portion 12a, an actuator 12c attached to the other end of the cylinder portion 12a so as to be able to move in and out, and housed in the cylinder portion 12a, the actuator 12c is biased in a protruding state. It is composed of a coiled spring 12d.

Therefore, the long hole 2 of the slide guide 21
The pressure mechanism 12 is moved along 1a to move the pressure mechanism 12
The actuator 12c is adjusted in position so as to contact the lower bottom portion of the thin tube 1, and in that state, the bolt 21b with the knob is tightened, whereby the thin tube 1 can be set to be pushed up by the pressing mechanism 12.

2 and 4, the clamp mechanism 4 is provided with a groove 4a having a V-shaped cross section for accommodating the thin tube 1. The shaft is provided so that this groove 4a can be covered from above. A holding arm 4c attached to 4b is provided. An operation lever 4d is attached to the shaft 4b, and a coil-shaped tension spring 4e is stretched between a substantially central portion of the operation lever 4d in the longitudinal direction and the base of the clamp mechanism 4. .

Then, a position where the holding arm 4c covers the groove 4a portion having a V-shaped section from above (the operating lever 4 in FIG. 4).
A coil-shaped tension spring 4e is provided with an overcenter between a position (solid line position of d) and a position where the holding arm 4c is expanded by approximately 90 degrees (position of broken line of the operating lever 4d in FIG. 4). Therefore, the operating lever 4d in FIG.
At the position indicated by the broken line in FIG.
The control lever 4d in FIG.
By rotating to the solid line position of d, the groove 4a having a V-shaped section is formed.
The thin tube 1 can be held by utilizing the elastic force of the spring 4e between the holding arm 4c and the holding arm 4c.

The clamp mechanism 4 shown in FIG. 5 is also constructed in the same manner as in FIG. 3, and the corresponding parts are designated by the same reference numerals. However, the position of the clamp mechanism 4 shown in FIG. 5 is attached to the slide guide 22 so as to be movable according to the length of the thin tube 1. This slide guide 22 is the slide guide 2 shown in FIG.
The configuration is almost the same as 1. That is, the slide guide 22 is provided with a long hole 22a, and the bolt 22b with a knob inserted in the long hole 22a is loosened so that the clamp mechanism 4 shown in FIG. Bolt 2 which is horizontally movable and has a knob
By clamping 2b, the clamp mechanism 4 can be fixed at that position.

Therefore, the clamp mechanism 4 is moved and fixed according to the length of the thin tube 1 mounted on the inner surface finishing device, and the position of the clamp mechanism 4 is set so as to coincide with the position of the open end 1a of the thin tube 1. Thus, the play on the open end 1a side of the thin tube 1 can be eliminated, and the problem that the open end 1a side of the thin tube 1 contacts the drive shaft 8 and damages the thin tube 1 can be avoided.

FIG. 6 shows a state in which the inner surface finishing device shown in FIGS. 2 to 5 is attached to a tilt table.
The same parts as those in FIG. 5 are represented by the same reference numerals. The caster 23 is attached to the lower portion of the tilt table 3 which constitutes the main body of the apparatus, and the caster 23 allows the entire apparatus to move. A control board 13 is arranged in front of the tilting table 3, and by operating a timer set knob 13a on the control board 13, the motor 5 can be rotationally driven for a predetermined time. Therefore, the inner surface finishing of the thin tube can be automatically completed, and the work efficiency can be improved.

In the embodiment of the present invention described above, a plastic tube is used as the joint, and the polishing processing liquid is filled in the narrow tube. However, if a metal joint is used as the joint, the inner surface is finished. The heat generated therein does not damage the joint and thus eliminates the need to use a polishing fluid. In that case, the apparatus can be arranged horizontally without using the tilting table as in the above-described embodiment. Further, in the above-described embodiment,
Although it is configured to finish the inner surface of one thin tube, a highly efficient apparatus can be realized by arranging this inner surface finishing apparatus in a plurality of rows with respect to the apparatus main body. Further, in the above-mentioned embodiment, the description is given of the one provided with the pressurizing mechanism that axially pushes up the bottom portion of the thin tube clamped to the apparatus main body by the clamp mechanism. The bottom portion of the thin tube may be pushed up in the axial direction. Further, the pressure mechanism may be detachably provided.

[0033]

As is apparent from the above description, according to the inner surface finishing apparatus for a thin tube according to the present invention, a clamp mechanism is provided on the apparatus main body, and the thin tube as a workpiece can be detachably attached by this clamp mechanism. Held in. And
The drive shaft inserted into the thin tube is rotated by the rotation of the motor while being held by the clamp mechanism, and the rotation of the drive shaft drives, for example, a grindstone as a polishing tool formed in a cylindrical shape. This makes it possible to remove burrs caused by polishing the inner surface of the thin tube and attaching a lid to the bottom of the thin tube, or protruding burrs caused by blowing out silicon as an impregnating agent. In this case, by further providing a pressurizing mechanism that pushes up the bottom of the thin tube, the bottom of the thin tube is pushed up, and the whetstone as a polishing tool can be brought into contact with the bottom of the thin tube at an appropriate pressure, and It is possible to effectively remove the generated hard burr.

Further, the clamp mechanism is clamped with respect to the apparatus main body so that one open end of the thin tube is located at the upper part and the other closed bottom part is located at the lower part.
The polishing liquid can be injected from one open end of the thin tube located at the upper portion, and the sharpness of the grindstone can be improved and the life can be extended. Also, since the clamp mechanism is configured to be movable according to the length of the thin tube attached to the inner surface finishing device, the open end of the thin tube can be set by setting the position of the clamp mechanism so as to match the position of the open end of the thin tube. It is possible to eliminate side play, and it is possible to avoid a situation where the open end side of the thin tube comes into contact with the drive shaft and the thin tube is damaged. Further, the drive shaft housed in the thin tube is provided with guide pieces made of a flexible material at a plurality of positions in the longitudinal direction, so that the drive shaft does not contact the inner surface of the thin tube and is fragile. Can be prevented from being damaged. Further, since the groove portion is formed on the side surface of the end portion of the grindstone, the processing (polishing) efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross section of a basic configuration of an inner surface finishing apparatus for a thin tube according to the present invention.

FIG. 2 is a side view showing a detailed configuration of the inner surface finishing device shown in FIG. 1 in a partial cross section, wherein (a) shows the left side of the device;
(B) is a figure which shows the right side of an apparatus.

FIG. 3 is a configuration diagram viewed in a direction of an arrow from line AA in FIG.

FIG. 4 is a configuration diagram viewed in a direction of an arrow from the line BB in FIG.

5 is a configuration diagram as viewed in the direction of the arrow from the line CC in FIG.

FIG. 6 is a side view showing a state in which the inner surface finishing device shown in FIG. 2 is attached to a tilt table.

FIG. 7 is a cross-sectional view showing the structure of a thin tube.

[Explanation of symbols]

 1 Capillary Tube 1a Open End 1b Bottom Part 2 Lid Body 3 Inclined Table 3a Slope Part 4 Clamping Mechanism 5 Motor 5a Rotor Shaft 6 Mounting Bracket 7 Clamper (Connecting Mechanism) 8 Drive Shaft 9 Joint 10 Grinding Stone (Polishing Tool) 11 Guide Piece 12 Pressing Mechanism 13 Control panel 14 Polishing liquid 21 Slide guide 22 Slide guide

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tomohide Otsuka 378 Oguni Town, Oguni Town, Nishiokitama District, Yamagata Prefecture 378 Toshiba Ceramics Co., Ltd. Oguni Factory

Claims (5)

[Claims] 1. An inner surface finishing device for a thin tube, the one end of which is open and the other end of which is closed to form a bottom portion, for polishing an inner surface portion of the thin tube, wherein the thin tube is attached to an apparatus body. A clamping mechanism for cutting, a polishing tool inserted into the thin tube from one open end of the thin tube clamped to the apparatus main body by the clamp mechanism, and a rotary driving force for transmitting the rotational driving force to the polishing tool. A drive shaft and a motor fixed to the apparatus main body and having a rotor shaft connected to a base end portion of the drive shaft via a connection mechanism, wherein the thin tube has one open end located at an upper portion and the other end. Of the motor is clamped with respect to the apparatus main body so that the closed bottom part of the is located at the lower part, and the polishing liquid can be injected from one open end of the capillary located at the upper part. rotation An inner surface finishing device for a thin tube, wherein a polishing tool is rotationally driven by a driving force via a drive shaft to polish an inner surface portion of the thin tube. 2. A plurality of the clamp mechanisms are provided at a plurality of positions in the longitudinal direction of the thin tube for clamping with respect to the apparatus main body, and a clamp mechanism for clamping one open end side of the thin tube is a long tube of the thin tube. The inner surface finishing device for a thin tube according to claim 1, wherein the inner surface finishing device is attached to the device body so as to be movable in any direction. 3. A guide piece made of a flexible material is attached to the drive shaft at a plurality of positions in the longitudinal direction so that the drive shaft does not contact the inner wall of the thin tube. The inner surface finishing device for a thin tube according to claim 1 or 2. 4. A pressurizing mechanism for axially pushing up the bottom of the thin tube clamped to the apparatus main body by the clamping mechanism is further provided.
The inner surface finishing device for a thin tube according to claim 3. 5. The polishing tool is formed of a cylindrical grindstone, and a groove is formed on a side surface of the grindstone facing the inner bottom portion of the thin tube. The inner surface finishing device for a thin tube according to any one of the above.