JPH0751923A - Cutting method and device - Google Patents

Abstract

PURPOSE:To reduce an extrusion space by enabling heat-treatment of the cut end surface of a pipe to be simply achieved on a line. CONSTITUTION:At the time of cutting, a pipe 22 is grasped by a first chuck 48 and a second chuck 50 of a cutting unit 24, and cut by a cutting part 42. After cutting, while the pipe 22 is still grasped by the second chuck 50, the cutting unit 24 is moved forward by an air cylinder 72 of a movement control device 26 to form a gap between the cut end surface. The heater 78 of a heat treatment unit 28 is inserted in the gap so as to make heat-treatment on the rear end surface of the preceding pipe 22 and the forward end surface of a following pipe 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting method and apparatus, and more particularly to a cutting method and apparatus for cutting a pipe extruded from an extruder and heat-treating the cut end face.

[0002]

2. Description of the Related Art When a plastic pipe is pressed and cut, the cutting end face is whitened or burrs are generated on the cutting end face due to distortion at the time of cutting, and the commercial value is reduced. Therefore, conventionally, after the pipe cut and cut is moved in parallel, the cutting end face is heat-treated with a heater to relieve the strain, thereby eliminating whitening and burrs on the cutting end face.

[0003]

In the prior art, since the cut end face is heat-treated after the pipe is moved in parallel, a wide extrusion space is required and it cannot be applied to an ordinary extrusion line. was there. Therefore, a main object of the present invention is to provide a cutting method and apparatus that can reduce the extrusion space.

[0004]

The first invention is a cutting method for cutting a pipe extruded from an extruder while taking it with a take-up machine. The pipe is pushed and cut after the take-up step to cut the cut end face of the pipe. It is a cutting method in which heat treatment is performed on a line. A second aspect of the present invention is a cutting device that cuts a pipe extruded from an extruder with a take-up device while cutting the pipe, and a frame extending in the extrusion direction, a cutting means movably supported on the frame in the extrusion direction, and attached to the frame. The cutting device includes a movement control unit that advances the cutting unit to open a gap between the cutting end faces, and a heat treatment unit that heat-treats the cutting end face in the gap.

[0005]

The pipe supplied from the take-up machine to the cutting device is gripped by, for example, a chuck and cut by pushing. Then, the cutting means is advanced by the movement control means while the preceding pipe is held by the chuck, for example, and a gap is opened between the cut end faces. Then, after the cutting means is returned to the original position, the heater is inserted in the gap between the cut end faces. After a while in that state, the cut end face of the subsequently extruded pipe is one face (rear face) of the heater.
To move the heater forward, and the other surface (front surface) of the heater is brought into contact with the cut end surface of the preceding pipe. Therefore, the cut end face of the pipe is heat-treated. And
After a certain period of time, the heater is removed from between the cut end faces.

[0006]

According to the present invention, a heater is inserted between a preceding pipe and a succeeding pipe on a line to heat the cut end face, so that the pipe is moved in parallel as in the conventional case. There is no need, and the extrusion space can be reduced. The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A cutting device 10 of this embodiment shown in FIGS.
Is used by being incorporated in an extrusion molding line 12 as shown in FIG. 4, for example. The extrusion molding line 12 includes an extrusion molding machine 14, a mold 16, a cooling water tank 18, and a take-off machine 20, and the cutting device 10 is arranged next to the take-out machine 20. Therefore, the pipe 22 extruded through the mold 16 by the extruder 14 is cooled by the cooling water tank 18, then taken by the taker 20, and supplied to the cutting device 10.

As shown in FIGS. 1 to 3, the cutting device 10 includes a cutting unit 24, a movement control device 26, a heat treatment unit 28 and a frame 30 for supporting them. The frame 30 includes a first portion 30a and a first portion 3
0a includes a second portion 30b formed above the first portion 30a and the second portion 30b in the width direction (left and right direction in FIG. 2) on both side ends in the line direction (left and right direction in FIG. 1). Extended rails 32 and 34 are formed.

The cutting unit 24 includes a first pulley 38 and a second pulley 40 driven by a motor 36, and a cutter portion 42 as shown in FIG. 5 is attached to the side surface of the second pulley 40. The cutter unit 42 includes three cutters 46 that are connected to each other by a crank 44 so that the cutters 46 can be gradually moved toward the center by utilizing the rotational speed difference between the first pulley 38 and the second pulley 40. Is configured. Further, before and after the first pulley 38, the second pulley 40, and the cutter portion 42, the first chuck 48 and the second chuck 50 are sandwiched therebetween.
Are connected using bolts and nuts 51. The first chuck 48 and the second chuck 50 are, as shown in FIG.
Three grips 5 connected to each other by a crank 52
4 and the air cylinder 56 for operating the grip 54, and the air cylinder 56 is configured so that the three grips 54 can be simultaneously operated.

Then, the first chuck 48 and the first pulley 3
8, a support member 60 having rollers 58 on its bottom surface on both side surfaces in the width direction of the second pulley 40 and the cutter portion 42.
A support member 61 having a roller 59 provided on the bottom surface is attached to both widthwise side surfaces of the second chuck 50, and the cutting unit 24 is supported on the rail 32 via the support members 60 and 61. To be done. Therefore, the cutting unit 24 can be moved on the rail 32 in the line direction, that is, the front-back direction. Further, pipe receiving rollers 62 and 64 are attached to both side surfaces of the cutting unit 24 in the front-rear direction, and the first portion 30 a of the frame 30 is attached.
A pipe receiving roller 68 that is moved up and down by an air cylinder 66 is attached to the front portion.

The movement control device 26 has a first frame 30
A limit switch 7 for stopping the forward movement of the cutting unit 24 is provided in front of the forward rod cylinder 72, including a backward rod cylinder 70 and a forward rod cylinder 72 attached to the portion 30a so as to extend in the line direction.
4 and 76 are attached. Heat treatment unit 28
Includes a plate-shaped heater 78 having heating surfaces on both sides thereof and an air cylinder 80 for moving the heater 78 up and down,
A support member 84 having a roller 82 on the bottom surface thereof is attached to the air cylinder 80. The air cylinder 80 and the heater 78 are supported on the rail 34 via the support member 84. Therefore, the heat treatment unit 2
The 8 can be moved on the rail 34 in the line direction. Further, a rod cylinder 86 is attached to the second portion 30b of the frame 30 so as to extend in parallel with the rail 34, and further, the front of the rail 34 detects that the heat treatment unit 28 has passed the pipe receiving roller 68. A limit switch 88 for turning on and a limit switch 90 and 92 for stopping the forward movement of the heat treatment unit 28 are attached.

A cutting device 1 according to FIGS. 4 and 7-12.
The operation of 0 will be described. As shown in FIG. 4, the pipe 22 extruded from the mold 16 by the extruder 14 is cooled by the cooling water tank 18, taken by the take-up machine 20, and then supplied to the cutting device 10. Then, when a limit switch (not shown) provided on the line with the tip of the pipe 22 is operated, as shown in FIG.
8 and the second chuck 50 are closed, the cutter unit 42 is driven, and the pipe 22 is cut. The distance from the limit switch (not shown) to the cutter unit 42 is set to be substantially equal to the length of the pipe to be obtained.

When the pipe 22 is cut, the first chuck 48 is opened as shown in FIG. 8, and then the cutting unit 24 is moved forward by the air cylinder 72 as shown in FIG. Then, when a timer (not shown) counts a predetermined time or the cutting unit 24 operates the limit switch 74 or 76 (FIG. 1, FIG. 3), the air cylinder 7
2 is stopped. Therefore, a gap of a predetermined length is provided between the cut end faces. Then, after the second chuck 50 is opened and the cutting unit 24 is returned to its original position by the air cylinder 70, as shown by the chain double-dashed line in FIG. 78 is inserted. Then, when the cut end surface of the subsequent pipe 22 continuously extruded by the extruder 14 comes into contact with one surface (rear surface) of the heater 78 as shown in FIG.
The heater 78 is moved forward by 2 and the other surface (front surface) of the heater 78 is brought into contact with the cut end surface of the preceding pipe 22. Then, when the heat treatment unit 28 operates the limit switch 88 (FIG. 3), the pipe receiving roller 68 is lowered by the air cylinder 66, and a timer (not shown) counts a predetermined time or the heat treatment unit 28 causes the limit switch 90 or 92 (FIG. 3). When 3) is activated, the heater 78 is removed from between the cut end faces as shown in FIG. After the cut end surface is heat-treated in this way, the preceding pipe 22 cut into a predetermined length is carried out from the line.

According to this embodiment, since the cutting end face is heat-treated by inserting the heater between the preceding pipe and the succeeding pipe on the line, the extrusion space can be reduced, and the usual extrusion line can be used. Can also be applied to. Further, since the second chuck 50 can be easily separated from the cutter portion 42 and the like on the rail 32 by removing the bolts and nuts 51, the cutter 46 is replaced between the second chuck 50 and the cutter portion 42. It is not necessary to previously provide a space for this. Therefore, the interval between the first chuck 48 and the second chuck 50 can be shortened, and the cutting accuracy can be improved.

Furthermore, since the gap is provided between the cutting end faces by moving the cutting unit 24 using the air cylinders 70 and 72, the gap size can be set arbitrarily and accurately. In the above-described embodiment, the plate-shaped heater 78 having heating surfaces on both sides thereof is used, but instead of this, a hot air blowing type heater 94 as shown in FIGS. 13 to 16 is used. Good.
The heater 94 includes a main body 96, and a plurality of hot air blowout holes 98 a and 98 b are formed in the substantially central portion of both surfaces of the main body 96 so as to correspond to the end faces of the pipes 22. Hot air inlets 100a and 100b for taking in hot air are formed. And the main body 9
Inside the 6, hot air outlet 98a and hot air intake 100a
An air passage 102a and a hot air outlet 98b communicating with
An air passage 102b is formed to connect the hot air intake port 100b with the hot air intake port 100b. Therefore, when in use, the hot air intake 10
The hot air taken into the main body 96 from 0a and 100b passes through the hot air outlets 98a and 98b to the pipe 22.
Is blown to the cut end surface of. The outlets of the hot air outlets 98a and 98b are formed, for example, in a tapered shape as shown in FIG. 17 so as to blow hot air over the entire cut end surface.

By using this heater 94, the cut end face of the pipe 22 can be heated even if the cut end face is not in direct contact with the heater 94, so that the heat treatment can be performed more reliably.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a right side view of the embodiment shown in FIG.

FIG. 3 is a perspective view of the embodiment shown in FIG.

FIG. 4 is an illustrative view showing an extrusion molding system to which the embodiment in FIG. 1 is applied.

FIG. 5 is an illustrative view showing a cutter unit of the embodiment in FIG.

FIG. 6 is an illustrative view showing a chuck of the embodiment in FIG. 1;

FIG. 7 is a schematic diagram showing a state of gripping and cutting a pipe.

FIG. 8 is a schematic view showing a state in which the first chuck is opened after cutting the pipe.

FIG. 9 is a schematic view showing a state in which a preceding pipe is moved forward to provide a gap between cut end faces.

FIG. 10 is a schematic view showing a state where a heater is inserted between the cut end faces of the pipe.

FIG. 11 is a schematic view showing a state in which a cut end surface of a pipe is heat-treated by a heater.

FIG. 12 is a schematic view showing a state where the heater is removed after the heat treatment.

FIG. 13 is an illustrative view showing another heater used in the embodiment in FIG. 1;

FIG. 14 is a plan view of the heater shown in FIG.

15 is a sectional view taken along line XV-XV in FIG.

16 is a sectional view taken along line XVI-XVI in FIG.

17 is an illustrative view showing a hot air outlet of the heater of FIG. 13. FIG.

[Explanation of symbols]

 10 ... Cutting device 12 ... Extrusion molding system 22 ... Pipe 24 ... Cutting unit 26 ... Movement control device 28 ... Heat treatment unit 30 ... Frame 32, 34 ... Rail 38 ... First pulley 40 ... Second pulley 42 ... Cutter part 48 ... 1 chuck 50 ... 2nd chuck 70, 72, 86 ... Air cylinder 74, 76, 88, 90, 92 ... Limit switch 78, 94 ... Heater

Front page continuation (72) Inventor Toshimasa Ikeoka 7-6-1, Sako, Odawara-shi, Kanagawa Stock company Kubota Odawara factory

Claims (2)

[Claims] 1. A cutting method for cutting a pipe extruded from an extruder while taking it with a take-up machine, wherein the pipe is cut and cut after a take-up step, and a cut end face of the pipe is heat-treated on a line. Cutting method. 2. A cutting device for cutting a pipe extruded from an extruder while taking it with a take-up device, the frame extending in the extrusion direction, cutting means supported on the frame so as to be movable in the extrusion direction, A cutting device, comprising: a movement control means attached to the frame, moving the cutting means forward to form a gap between the cutting end faces, and a heat treatment means for heat-treating the cutting end face in the gap.