JPH0757478B2 - Method and device for cutting pipe-shaped material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention can be used when a pipe-shaped material made of a thin synthetic resin, particularly a crystalline polymer such as polyester, is cut into a plurality of predetermined lengths. The present invention relates to a method and an apparatus for cutting a pipe-shaped material.

(Prior art) Stretched pipe-shaped material of crystalline polymer due to thermoplasticity such as polyester and polyamide is apt to cause micro-layer delamination due to external force such as cutting, and a cutting technology for providing a uniform cutting surface has not been developed. .

Conventionally, Japanese Patent Publication No. 55-8315 proposes a technique of cutting a pipe-shaped object at the same time with a plurality of knives. This is done by cutting the wall of a long and thin cored tube made of rubber or the like at the same time in multiple circumferential positions with cutters in the circumferential direction. The tube can be removed from the mandrel by the unit (by keeping it connected).

Further, a technique of inserting a mandrel into a tube and cutting the mandrel one by one has been proposed in JP-A-59-14919. This is a mandrel that is movable in the flow direction of the tube to be molded and has a groove in its circumferential direction in order to cut the continuously molded tube into a predetermined length in-line. Insert it inside the tip of the coming tube, press the tube and mandrel from the outside before and after the mandrel to fix it, and cut one tube so that the cutter rotating outside the tube enters the groove of the mandrel, Release the fixation from the outer surface of the tube, and push the tube out of the mandrel and discharge.

Further, Japanese Patent Laid-Open No. 56-20184 has proposed a technique in which a tubular material is held and cut on a mandrel that expands and contracts in the radial direction.

This is a device for producing endless annular elements, especially belts for transmitting power or driving force, which is used to attach a tubular material to a workpiece holder, that is, a mandrel, rotate it, and cut it into slices with a cutting device. A ring-shaped element is manufactured by mounting a material on a mandrel that is inflatable and contractible, expands it from the inside by fluid, holds the same material, rotates it, and contacts it with a cutting device to cut it. Is.

(Problems to be Solved by the Invention) In the technique disclosed in Japanese Patent Publication No. Sho 55-8315, a plurality of cutters are used to make incisions in the circumferential direction at the same time, but the cutters do not reach the core. The pipe can be integrated into a unit without being completely cut. Therefore, it is impossible to obtain a large number of completely cut tubes at a time.

Further, the technique disclosed in Japanese Patent Laid-Open No. 59-14919 is to cut continuously formed tubes one by one to a predetermined length according to the speed. It is not possible to cut many tubes at the same time. Absent. In addition, the tube is pressed from the outside to be gripped and fixed, and the diameter is not expanded from the inside. Therefore, when the cutter is used to cut from the outside as described above, there is a drawback that the tube bends inward and the cutting state deteriorates.

In the technique disclosed in Japanese Patent Publication No. 56-20184, a mandrel that is expandable / contractible from the inside is used as a gripping device, and the material is cut by a cutter from the outside, but the cutter reaches the mandrel when cutting. Become. Therefore, the cutter comes into contact with or cuts into the mandrel, which has the drawback of shortening the life of the cutter.

The present invention is intended to provide a method and apparatus for cutting a pipe-shaped product, which is obtained by cutting a stretched pipe-shaped product made of a long crystalline polymer at a plurality of places and simultaneously obtaining a plurality of pipe-shaped products cut into a predetermined length. Is.

(Means for Solving the Problems) Therefore, the present invention provides a method for simultaneously cutting a stretched pipe-shaped material made of a long crystalline polymer at a plurality of points,
Except for the cutting part of the pipe-shaped object, the part adjacent to it is gripped by an elastic support that expands from the inside to a perfect circle over the entire circumference, and a plurality of cutters are attached to the pipe-shaped object. By pressing the cutter while rotating it, the pipe is cut at multiple points.
This is a means for solving the problem.

Further, the present invention is an apparatus for simultaneously cutting a stretched pipe-shaped material made of a long crystalline polymer, except for a cutting portion of the pipe-shaped material, and gripping a portion adjacent to the pipe-shaped material at a plurality of positions from the inside over the entire circumference. And a cutting device having a plurality of cutters, and the cutter is pushed onto the pipe-shaped object while rotating the pipe-shaped object or the cutter. In this way, a long pipe-shaped material is cut at a plurality of places at the same time to obtain a pipe-shaped material of a predetermined length, which is a means for solving the problem.

(Operation) According to the present invention, the pipe-shaped material is gripped by the gripping device composed of the elastic support body whose diameter is expanded from the inside to a perfect circle, and the shock applied to the pipe-shaped material is absorbed at the time of cutting. The pipe-like material can be reliably cut without causing
In addition, since there is no elastic support that expands from the inside at the cutting point of the pipe-shaped object, the cutter can cut without contacting the gripping device. Therefore, it is possible to obtain a plurality of pipe-shaped objects of a predetermined length by cutting once, and at the same time, after the completion of cutting, the elastic support of the gripping device is reduced in diameter to easily remove the pipe-shaped object of a predetermined length from the gripping device. be able to. Also, since the cutter cuts the pipe-shaped object without contacting the gripping device,
Longevity can be maintained.

(Embodiment) The present invention will be described below with reference to embodiments of the drawings. Figs. 1 to 7 show a pipe-shaped material cutting device according to an embodiment of the present invention. In the figure, reference numeral 1 is a stretched pipe-like material made of a long synthetic resin, particularly a crystalline polymer such as polyester, for cutting and use. 2 is a gripping spindle device, and a plurality of spindle shafts 3 (in the embodiment, 4)
The grip unit 4 and the spacer 18 are attached, the snap ring 21 is used for positioning, and the cap 20 is fixed to the spindle shaft 3 to guide when the long pipe 1 is mounted. Driven by 13
Is rotated by. The spindle shaft 3 has a fluid hole 7 penetrating through the center thereof, a plug 22 at the tip, and a rotary joint 5 at the other end to feed a pressure fluid such as water or air.

Further, the grip unit 4 covers the outer periphery of the body 9 with an elastic body 11 (for example, rubber) and adheres both ends in the axial direction to the body 9 so as to prevent air leakage, and to provide a radial hole at the center of the body 9. A pressure fluid is sent from the inside of the elastic body 11 from the elastic body 11, and the elastic body 11 expands and expands into concentric circles. The rotary joint 5 is for taking in and out the pressure fluid from the fluid inlet / outlet 6. Further, the drive device 13 rotationally drives the gripping spindle device 2 via a belt and a pulley by a drive motor (not shown). Reference numeral 14 denotes an actuating cylinder, which has a support 15 and a cutter 17 attached to the tip of the rod and is actuated by pressure fluid, and is fixed to a frame 24. The frame 23 fixes a bearing 25 and a drive motor (not shown), and the frame 24 fixes the working cylinder 14 and the guide 16. A concave portion 26 is formed in the connecting portion of the grip units 4 so that the cutter 17 does not come into contact with the cutting unit 4 when cutting.

That is, except for the cut portion, the portion adjacent to the cut portion is gripped by an elastic support body that expands from the inside to a perfect circle over the entire circumference.

Except for the cutting point here, the point adjacent to it is
Within 50 mm on one or both sides from the cutting point, preferably 20 mm
Refers to the points within. As the elastic support for fixing the inside of the pipe-shaped object over the entire circumference, a stretchable and airtight tube-shaped object is expanded by hydraulic pressure, liquid pressure or gas pressure from the outside, and the pipe-shaped object is It has the function of supporting from. Further, the cutter that can be used in the present invention is a knife cutter, a laser cutter, a hot wire cutter, or the like, but is preferably a knife cutter, and the knife cutter is preferably heated to 100 ° C. or higher.

Next, the operation will be described. The long pipe-shaped object 1 is mounted on the gripping spindle device 2 by a mounting device (not shown).
The gripping spindle device 2 has a plurality of (for example, four) gripping units 4 attached to a spindle shaft 3,
The gripping units 4 may be integrated for several pieces. Further, there is an appropriate gap between the inner diameter of the long pipe-shaped object 1 and the outer diameter of the gripping unit 4 of the gripping spindle device 2.
The gripping spindle device 2 can be mounted smoothly.

When the long pipe-shaped object 1 is mounted at a fixed position, compressed air is sent from the fluid inlet / outlet 6 of the rotary joint 5.
The compressed air is sent to the radial hole 8 through the central hole 7 of the spindle shaft 3 and further to the inside of the elastic body 11 from the radial hole 10 of the body 9 of the grip unit 4. Elastic body 11
When is expanded, the outer diameter of the gripping unit 4 is increased, and the long pipe-shaped object 1 is gripped from the inside. The O-ring 12 prevents leakage of compressed air.

Next, the long pipe-shaped object 1 is integrated with the gripping spindle device 2 and starts to rotate by the drive device 13. At the same time, when the rod of the working cylinder 14 begins to move in the direction A, the support 15 moves along the guide 16 and the plurality of cutters (five in the example) 17 attached thereto are rotated by the rotating pipe. The material 1 is contacted and cut. Support 15
After the cutter 17 cuts the pipe-shaped material 1, the gripping unit 4
It is designed to stop at a position where it does not come into contact with the recess 26 of the.
Also, during high-speed operation, the cutter should be used to prevent peeling.
Heat 17 as needed.

After the cutting, when the rod of the working cylinder 14 moves in the direction B and returns to the initial position, the gripping spindle device 2 also stops rotating, and when the compressed air inside is discharged, the elastic body 11 contracts and is cut. The pipe-shaped material is taken out from the gripping spindle device 2 by a discharge device (not shown).

1 and 2 show the case where the cut ends of the pipe-shaped material 1 are not used, but in the case of the pipe-shaped material 1a used over the entire length, the cutter 17 as shown in FIGS. 6 and 7 is used. The gripping spindle device 2a in which the spacers 18 are removed and the spacer 18 is changed to a stepless portion 19 is adopted. Although the case where the number of the elastic bodies 11 is one has been described above, the elastic body 11a divided into two as shown in FIG. 8 may be adopted.
Alternatively, the gripping spindle device 2 may be fixed, and the cutter 17 may be rotated around the pipe-shaped object 1.

(Effects of the Invention) As described in detail above, according to the present invention, a pipe-shaped object is grasped by a grasping device made of an elastic support body whose diameter is expanded from the inside to a perfect circle, and an impact applied to the pipe-shaped object at the time of cutting is absorbed. Since the pipe-shaped material can be reliably cut without causing microscopic delamination, and the cutting portion of the pipe-shaped material does not have an elastic support that expands from the inside, the cutter contacts the gripping device. Can be cut without Therefore, it is possible to obtain a plurality of pipe-shaped objects of a predetermined length by cutting once, and at the same time, after the completion of cutting, the elastic support of the gripping device is reduced in diameter to easily remove the pipe-shaped object of a predetermined length from the gripping device. be able to. Further, since the cutter cuts the pipe-shaped object without coming into contact with the gripping device, the life can be kept long.

[Brief description of drawings]

FIG. 1 is a side view of the entire apparatus showing an embodiment of the present invention, and FIG.
1 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a detailed view of a C portion of FIG. 2, a state diagram in which a pipe-like object is not gripped, and FIG. 4 is a detailed view of a C portion of FIG. FIG. 5 is a state view in which a pipe-like object is gripped, FIG. 5 is a sectional view taken along line VV of FIG. 4, FIG. 6 is a side view showing another embodiment of the present invention, and FIG. 7 is FIG. VII ~ V
II sectional view, FIG. 8 is a sectional view of a main part showing another embodiment of the grip unit. Explanation of the main parts of the figure 1.1a …… Long pipe-shaped object 2.2a …… Gripping spindle device 4 …… Gripping unit 13 …… Drive device 14 …… Working cylinder 17 …… Cutter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yohisa Hama 2-1-1 Katata, Otsu City, Shiga Prefecture, Toyobo Co., Ltd. (72) Inventor Tatsuo Shimura 2-1-1 Katata, Otsu City, Shiga Prefecture No. Toyobo Co., Ltd., Research Institute (56) Reference JP 59-14919 (JP, A) JP 55-8315 (JP, B2) JP 56-20184 (JP, B2) JP 60 -4734 (JP, Y2)

Claims (2)

[Claims] 1. A method for simultaneously cutting a stretched pipe-shaped material made of a long crystalline polymer at a plurality of locations, except for the cut portion of the pipe-shaped material, and the portion adjacent to the pipe-shaped material from the inside over the entire circumference. Characterized by gripping with an elastic support that expands in a circle and pressing multiple cutters against the pipe-shaped object while rotating the pipe-shaped object or the cutter while cutting the pipe-shaped object at multiple locations A method for cutting pipe-shaped material. 2. An apparatus for simultaneously cutting a stretched pipe-shaped material made of a long crystalline polymer, excluding the cut portion of the pipe-shaped material, and gripping a portion adjacent to the pipe-shaped material at a plurality of locations from the inside over the entire circumference. And a cutting device having a plurality of cutters, and the cutter is pressed against the pipe-shaped object while rotating the pipe-shaped object or the cutter. A pipe-shaped material cutting device, characterized in that a long pipe-shaped material is simultaneously cut at a plurality of locations to obtain a pipe-shaped material of a predetermined length.