JPH0489231A - Expansion device for ptfe liner tube end section - Google Patents

Abstract

PURPOSE:To systemize control easily and also make sensitive axis alignment of respective flaring jigs and line tubes easy by mounting a plurality of flaring jigs required for a series of expansion processes brought together on a jig retaining board and setting the jig retaining board rotatably. CONSTITUTION:A jig retaining board 54 with its rotating shaft 55 as its center is mounted rotatably adjacent to a tube retaining means 10 on a base support bed 51. A plurality of flaring jigs 57, 58 and 59 are disposed on the jig retaining board 54 in a manner of projecting in the direction of the tube retaining means 10. Said respective flaring jigs 57-59 are mounted on the positions where the rotating radius from the rotating shaft 55 are almost same in a manner of almost conforming with the axial core of a liner tube in a metal tube retained by the tube retaining means 10 in the case the jig retaining board 54 is rotated following the rotation of the rotating shaft 55. Also, respective flaring jigs 57-59 are mounted movably in the axial direction to the jig retaining board 54 so as to move back and forth freely in the direction of the tube retaining means 10. A first flaring jig 57 is used in the initial expansion process, and a second flaring jig 58 is used for the middle expansion process, while a third flaring jig 59 is used in the last expansion process.

Description

Detailed Description of the Invention Technical Field of the Invention The present invention relates to polytetrafluoroethylene resin (hereinafter referred to as rPTFEJ) which is lined in flanged metal pipes such as straight pipes, L-shaped pipes, and T-shaped pipes. A liner tube end expansion device made of PTFE that can expand the end of a liner tube made of PTFE along the flange surface.

Technical Background of the Invention While PTFE has superior properties compared to other synthetic resins in terms of heat resistance, chemical resistance, and non-adhesiveness,
Its processing method is similar to powder metallurgy, and it is difficult to process it using the processing methods used for other heat-melting synthetic resins, and requires the use of special processing means.

For example, when lining a flanged metal tube with PTFE, the sleeve tube is loosely inserted into the metal tube to be lined, and these metal tubes and the sleeve tube are used as a mold. The PTFE powder is preformed under pressure, and then fired at a temperature higher than the melting point of PTFE (approximately 327° C.) to obtain a PTFE inner tube. As shown in Fig. 5.6, the liner tube after firing protrudes a predetermined length from the metal flange surface, and this protruding portion is expanded along the flange surface. Alternatively, a liner tube made of PTFE may be prepared in advance using a separate mold, inserted into a metal tube, and the tube end protruding from the flange surface may be expanded along the flange surface.

The operation of expanding the end of a liner tube inserted into a metal pipe along a flange surface has conventionally been carried out as follows.

PTFE liner The metal tube covered with the PTFE liner tube is fixed by some means so that the liner tube protrudes a predetermined length from the flange surface, and a heated conical flare jig is attached to the end surface of the liner tube. The end of the tube is expanded along the flare jig, and the first step of expansion process is performed. - Since it is difficult to expand the end of the liner tube approximately 90 degrees in the expansion process, the expansion process uses multiple flaring jigs with different top angles to gradually expand the end of the liner tube. This is done by expanding. In the final expansion process, a convex cooling flare jig that matches the shape of the flange surface of the metal tube is used, and by pressing this against the end of the liner tube, the tube end is finally expanded along the flange surface. Expands approximately 90 degrees.

However, the conventional flare jigs used in such conventional end expansion processes are individually managed,
The heating temperature control, pressing force control, etc. of each flare jig depends on the skill of the operator and has not been systemized, resulting in the disadvantage of poor workability.

In addition, it is difficult to center each flare jig and the liner tube during the expansion process, requiring skill, and this also has the disadvantage of poor workability.

OBJECTS OF THE INVENTION The present invention has been made in order to eliminate the disadvantages of the prior art described above, and it is easy to systemize temperature control or pressing force control of each flare jig required for a series of expansion steps. Furthermore, the purpose is to provide a device for expanding one end of a liner made of PTFE, which allows easy centering between each flare jig and the liner tube, and which allows all flare jigs to be collectively managed.

Summary of the Invention In order to achieve the above object, the PTF according to the present invention
E-made liner Liner tube end expansion device A PTFE liner liner tube end that allows the end of a polytetrafluoroethylene resin liner tube lined in a metal tube with a flange to be expanded along the flange surface. The expansion device includes: a tube holding means for holding the vicinity of the flange of the metal tube into which the liner tube is inserted so that the end of the liner tube protrudes from the flange of the metal tube; and the end of the liner tube. a plurality of flare jigs for gradually expanding the end of the liner tube along the flange 7 surface by being pressed against the flange 7; a jig holding plate rotatably mounted so that the axis of the jig is located at a position that substantially coincides with the axis of the liner tube inserted into the metal tube held by the tube holding means; A jig that presses the rear end of this flare jig and presses this flare jig against the end of the liner tube when the axis of either flare jig and the axis of the liner tube substantially coincide. It is characterized by having a pressing means.

In the PTFE liner tube end expansion device according to the present invention, a plurality of flaring jigs necessary for a series of expansion steps are mounted on the jig holding plate.
It is possible to manage these jigs all at once.

To perform expansion, by rotating the jig holding plate, the axis of the flare jig used for each stage of the expansion process is aligned with the axis of the liner tube end inside the metal tube held by the tube holding means. The rear end of this jig is pressed by the jig pressing means so as to substantially match the core. At that time, the jig holding plate attached to the second flare jig is rotatably mounted, so when the tip of the flare jig is inserted into the end of the liner tube, the jig holding plate As a result of the small rotational movement of the two axes, their axes almost completely coincide. Therefore, the shaft alignment work is also easy.

Furthermore, it is also possible to provide individual heating means or cooling means for each flare jig and to perform temperature control of these at once. Further, it is also possible to control the pressing force of the jig pressing means all at once.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a front view of a PTFE liner tube end expanding device according to an embodiment of the present invention, FIG. 2 is a plan view of the expanding device, and FIG. 3 is a view of the flare jig shown in FIG. 2. ■−■
4 is a schematic view taken along the line IV-IV of the tube holding means shown in FIG. 2, and FIGS. 5 and 6 show the tube holding means shown in FIG. FIG. 7.8 is a schematic cross-sectional view of the liner tube before it is expanded, and FIG. 7.8 is a cross-sectional view of the main part of the liner tube showing the expansion process in which the end portion is expanded.

As shown in FIG. 12, PTF according to an embodiment of the present invention
E-manufactured liner liner tube end expansion device 2, for example No. 5
．． It has a tube holding means 10 for holding the vicinity of the flange 8 side of the metal tube 5.6 into which the liner tube 4 is inserted as shown in FIG.

The end portion 4a of the liner tube 4 projects a predetermined length from the flange surface of the metal tube 5.6, and this portion is expanded along the flange surface.

In this embodiment, the tube holding means 10 consists of a pair of holding pieces 12, 14, each holding piece 12.
．． 14 is formed with V-shaped notches 16, 1.8 for sandwiching the metal tube 5 from both sides. Each holding piece 12.1
4 is movable towards and away from the Y-axis direction along a pair of guide rods 21 and 22 arranged in parallel on the support base 20.

The movement of these holding pieces towards and away from each other in the Y-axis direction is carried out by the drive rod 2.
4 and clamp handle 26. The drive rod 24 is formed with threaded portions in mutually opposite directions.
Each of the retaining pieces 12.14 is adapted to engage with each neck portion. The drive rod 24 is connected to the clamp handle 2.
It is designed to be rotated by 6.

In this embodiment, in order to make the tube holding means 10 movable in three axes perpendicular to each other, the following mechanism is provided.

In order to move the tube holding means 10 in parallel in the Y-axis direction, the outer circumference of an outer cylinder 27 disposed on the outer circumference of the rod 24 so as to be coaxial with the Y-axis drive rod 24 is fixed to a support plate 20 on the support base 20. 30, and the drive rod 24 is attached to the inner periphery of the outer cylinder 27 so as to be relatively rotatable and move simultaneously in the axial direction.The outer cylinder 27 is rotated by the Y-axis handle 28. It is now possible. If you configure it like this,
By turning the Y-axis handle 28, the drive rod 24 is translated in the Y-axis direction together with the holding piece 12.14.

In addition, in order to move the tube holding means 10 in the X-axis direction, an X-axis moving spout 32 is attached to the lower part of the support base 20, and a bevel gear 34 formed at the tip of this rod is used to drive the X-axis. A bevel gear 36 formed at the tip of the rod 38 is screwed together,
By rotating the X-axis handle 40, the X-axis moving rod 32 is rotated, and the support base 20 screwed thereon is moved in the X direction. Note that, although not shown, a guide rod is also attached below the support base 20 to guide its X-axis movement, so that the support base 20 can be directed from below. With this configuration, by rotating the X-axis handle 40, the X-axis moving rod 32
The support base 20 is moved along the X axis together with the tube holding means 10.

In addition, in order to move the tube holding means 0 in the Z-axis direction (see Figure 1), an auxiliary support 41 is installed below the support 20, and a male thread is formed on the support 4. The four legs 42 are screwed together, the outer peripheries of the legs 42 are fixed to gears 44, and the Z-axis gear 46 disposed in the center of the four gears 44 is screwed together with each gear 44. Then, the rod 48 fixed to the second two-axis gear 46 is
0 and can be rotated. By turning this Z-handle 50, each gear 46, 44 rotates, the auxiliary support base 41 moves in the Z-axis direction with respect to the basic support base 51, and as a result, the tube holding means 10 also moves in the Z-axis direction. It is movable.

In this embodiment, since it is unstable to hold the flange side portion of the metal tube 5 by the tube holding means 10, as shown in FIG. 5
I am trying to support it with 3.

A jig holding plate 54 is mounted on the basic support stand 51 so as to be rotatable in the entry direction shown in FIG. 3 about a rotation shaft 55 so as to be adjacent to the tube holding means 1( ). The rotation shaft 55 is supported by a bearing 56 installed on the base support 5. The jig holding plate 54 includes a plurality of flare jigs 57,
58.59 (three in this embodiment) or tube holding means 10
It is installed so that it protrudes in the direction. These 6 flare jigs (-157 to 59) are approximately the axis of the liner tube 4 in the metal tube held by the tube holding means 10 when the jig holding plate 54 is rotated around the rotation axis 55. - so that the rotation radius from the rotation shaft 55 is approximately the same.

Moreover, each of the flare jigs 57 to 59 is mounted so as to be movable in the axial direction with respect to the jig holding plate 54 so as to be freely movable forward and backward in the direction of the tube holding means 10.

Specifically, at the rear end of each jig 57 to 59, there is a zero for shaft movement.
Rods 60, 61 and 62 are formed, and these rods 6
0 to 62 are bearings 63 and 64 fixed to the jig holding plate 54
．． 65 so that the shaft can be moved. At normal times, the rear ends 60a61, a62a of each lot 60 to 62 and the jig holding plate 54 are spaced so that each of the jigs 57 to 59 is at the maximum retracted position with respect to the tube holding means 10. are each equipped with a return spring 66.

Further, as shown in FIG. 3, both sides of the base support base 5 and the jig holding plate 54 are arranged in a pair or in a double row so that the jig holding plate 54 stops at a predetermined intermediate rotation position. The spring 68 is adapted to be connected. A handle 70 is formed on the outer periphery of the jig holding plate 54, and the jig holding plate 54 can be rotated in the direction of arrow A with a relatively small force by the operator's hand. ing.

The first flare jig 57 among the plurality of flare jigs is
This is for use in the initial expansion process as shown in Fig. 7, and the jig tip angle θ1 (see Fig. 2) is 70 to 1.
00 degrees, preferably 85 to 95 degrees. Also, this first
The flare jig 57 is equipped with a heating means (not shown), making it possible to heat the jig to about 350°C to 370°C. The heating temperature depends on the suppression time described below, or is determined so as to form a PTFE liner tube and prevent it from becoming kelp. As the heating means, a hunt heater or the like is exemplified, and it is preferable to attach a temperature sensor or the like to control the jig heating temperature.

The second flare jig 58 is for use in the upper stages of mid-term expansion, and the jig tip angle θ2 is ][]0 to 1.40.
degrees, preferably ]]0 to 13[) degrees. Moreover, the heating temperature of the jig 58 is preferably 150 to 200°C. The heating means and heating control can be performed in the same manner as the first flare jig 57.

The third flare jig 59 is used for the final expansion step as shown in FIG. 8, and its tip has a convex shape to match the shape of the flange surface to be lined. Third flare jig 59 used for final expansion process
is preferably cooled without heating. Therefore, cooling water is circulated within this jig 59.

A jig pressing means 7 is provided on the jig rod rear end 60a to 62a side of the jig holding plate 54 on which such a jig is mounted.
2 is installed on the control device 74. The control device 74 is
It is used to control the temperature of each of the jigs 57 to 59, to control the pressing force by the suppressing means 72, to control the suppressing time, etc., and is installed on the base support 51.

In this embodiment, the pressing means 72 consists of a pressing rod 77 and a pressure cylinder 76. Supply and discharge of pressure fluid to and from the pressure cylinder 76 is controlled by a control device 74. When the axis of any of the jigs 57 to 59 substantially coincides with the axis of the end of the liner tube, the pressing rod 77 is located at a position where it can press the rear ends of the rods 60a to 62a, which are the rear ends of this jig. It is installed in Pressure cylinder 76 is driven;
The pressing rod 77 protrudes, and one of the rod rear ends 60a
When ~62a is pressed, the corresponding jigs 57~59
is pressed against the end of the liner tube, causing it to expand. The pressing force and pressing time by the pressing rod 77 differ depending on the jig. For example, for the first flare jig 57 and the second flare jig 58, the pressing force is
When the cylinder diameter of the pressure cylinder 76 is 80A, it is preferable that the pressure of the pressure fluid is about 7 kg/c in gauge pressure, and the suppression time is 2 to 3 minutes. Further, if the third flare jig 59 is used, the pressing force is preferably the same as that described above, and the pressing time is 2 to 10 minutes. When the pressing by the pressing rod 74 is released, the pressed jig is automatically returned to its original position by the force of the return sublink 66.

Such a PTFE liner liner tube end expanding device 2 is used to expand the liner tube end 4 of a liner tube 4 inserted into a flanged metal tube 5 as shown in FIG. 5.6, for example.
In order to expand a and align it with the joint surface of flange 8,
Follow the steps below.

First, the vicinity of the flange of the metal tube 5 is gripped and fixed using the tube holding means 10 shown in FIG. 1.2.4.

Next, the handles 28, 40, 50 are operated to move the tube holding means 10 in the X, Y, and Z axis directions to position the metal tube 5.

After that, the operator places his/her hand on the handle 70 of the jig holding plate 54 and rotates the holding plate 54, and the first flare jig 57
The axis of the liner tube end 4a in the tube held by the tube holding means 1o is approximately aligned. Next, the pressure cylinder 76 is driven to project the suppression rod 74,
The rod rear end 60a is pressed and the first flare jig 57 is pressed against the liner tube end 4a as shown in FIG. At this time, since the jig holding plate 54 is rotatable, even if the axes are slightly misaligned, the axes of the jig and the liner tube are almost completely aligned by the slight rotation of the holding plate 54. matches.

Thereafter, by sequentially pressing the flare jigs 58 and 59 against the liner tube end 4a in the same manner, the end expanding process is completed, and the tube end 4a is opened as shown in FIG.
The flange 8 is finally expanded by approximately 90 degrees along the joint surface.

Note that the present invention is not limited to the embodiments described above, and can be variously modified within the scope of the present invention.

For example, the tube holding means 10 and the jig pressing means are not limited to the above-mentioned embodiments, but may be anything that can perform these functions.

Furthermore, the structure of the jig holding plate 54 is not limited to the embodiment described above.

As described in detail, according to the present invention, the two flare jigs are mounted together on the jig holding plate, so it is possible to control the temperature of each flare jig necessary for a series of expansion steps. It becomes possible to control the pressing force, suppression time, etc. all at once, and systematization or management of the control becomes easy.

Furthermore, since the jig holding plate is rotatably mounted, delicate centering (axis alignment) between each flare jig and the liner tube becomes extremely easy.

[Brief explanation of drawings]

FIG. 1 is a front view of a PTFE liner tube end expanding device according to an embodiment of the present invention, FIG. 2 is a plan view of the expanding device, and FIG. 3 is a view of the flare jig shown in FIG. 2. ■−■
4 is a schematic view taken along line IV-IV of the tube holding means shown in FIG. 2, and FIG. 5.6 is a schematic view taken along line IV-IV of the tube holding means shown in FIG. FIGS. 7 and 8 are cross-sectional views of essential parts of the liner tube showing the expansion process in which the end portions are expanded. 2...PTFE liner Liner tube end expansion device 4 Inner tube 4a...Tube end 5...
Metal pipe 8...Flange 10...Pipe holding means 54...Jig holding plate 55...Rotation shaft 57, 58, 59...Flare jig 72...Jig pressing means 74... Pressure port, Nd 76...Press cylinder cylinder patent applicant Nippon Halker Industries Co., Ltd. Agent Patent attorney Shunichi Suzuki Agent
Patent Attorney Previous [L] Figure 4 Procedural Dispute 11j Ordinary Figure 5 August 29, 1990 1゜ Case Description 1990 Patent Application No. 204,159 1990
Patent application filed on August 1st 2゜ Name of the invention PTFE liner Liner tube end expander Figure 6 Relationship to the case of the person making the device Patent applicant address 2-3-1 Marunouchi, Chiyo IJ Ko-ku, Tokyo Name Title Nippon Halcar Industry Co., Ltd. Representative Toshihisa Takizawa 4゜Address Name Meijin (Postal code I41) 3rd floor, Araku Building, 19-2 Nishigotanda 2Y-ro, Tokyo Parts Ward [Telephone Tokyo (491)] 3161] 8199 Patent Attorney Shunichi Suzuki (and others) Subject drawings (Figures 1 to 8) of the voluntary amendment supplement 1 with [''] of the amendment order Contents of the amendment Figures 1 to 8 of the drawings Amend as shown in the attached sheet. Agent other than the above (zip code 141) Address
3rd floor, Araku Building, 2-19-2 Nishigotanda, Tokyo Parts Ward, Tel: Tokyo (491) 3161] Figure 11-Chome -- Figure Figure Figure Figure Figure Figure Figure

Claims (1)

[Claims] 1) Expansion at the end of a PTFE liner tube that allows the end of a polytetrafluoroethylene resin liner tube lined in a flanged metal tube to be expanded along the flange surface. In the apparatus, a tube holding means for holding the vicinity of the flange of the metal tube into which the liner tube is inserted so that the end of the liner tube protrudes from the flange of the metal tube; A plurality of flare jigs are pressed one after another to gradually expand the end of the liner tube along the flange surface, and these flare jigs are held movably in the axial direction, and the axis of each flare jig is a jig holding plate rotatably mounted so that the core thereof is located at a position substantially coinciding with the axis of the liner tube inserted into the metal tube held by the tube holding means; jig pressing means for pressing the rear end of the flare jig and pressing the flare jig against the end of the liner tube when the axis of the flare jig and the axis of the liner tube substantially coincide; A PTFE liner tube end expansion device. 2) The PTFE according to claim 1, wherein one of the flare jigs is a final expansion jig and has a cooling means, and the other flare jigs are equipped with a heating means. Made of liner tube end expander. 3) The tube holding means is equipped with a tube holding part moving means for moving the tube holding means in three axial directions.
PTFE liner tube end expansion device according to item 1 or 2.