JPH03251307A - Pipe cutting device - Google Patents

Abstract

PURPOSE:To eliminate the need for an arrangement work of whenever the pipe cutting length is changed, by projecting the mandrel which is fitted to a pipe from the stopper face which abuts on and positions a pipe end face, and moving a cutter in the axial direction and in the direction perpendicular to the axis. CONSTITUTION:A cutter holding body 56 is advanced by a cylinder 57 by fixing the position of a stopper 62 so that a cutter 58 comes to the specific position, it is abutted on a stopper abutment part and the position of the cutter 58 is decided by 57. A table 10 is then rotated and stopped when the mandrel 26 corresponding to the thickness of a cutting pipe 28 reaches a cutting station. Now a movable part 48 is advanced by a cylinder 49, the mandrel 26 is projected by advancing a holding body 30 and rotated with its fitting to a pipe 28. A lift body 50 is then descended, the cutter holding body 56 is made free by advancing the stopper 62 with the rotation of a screw 70 according to the cutter 58 being pressed to and biting the pipe 28, the cylinder 57 is made free, and the cutter 58 escapes in the axial direction by the thickness of the blade. Changing of a jig, etc., becomes unnecessary even in case of the cutting length of the pipe 28 being changed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a pipe cutting device, and more particularly to technical means for improving productivity.

(Prior Art) FIG. 8 shows a conventionally used long pipe cutting device. , in the figure, 100 is a pipe stopper, which is positioned by bringing one end surface of the pipe 114 into contact with it. This pipe stopper 100 is connected to a cylinder 102 and is moved by the cylinder 102 under the guidance of a guide rail 104 and a fitting part 106 to change its position with respect to the pipe 114.

108 is a positioning tool for the pipe stopper 100;
The position of the pipe stopper 100 is determined by being brought into contact with this positioning tool 108.

110 is a mandrel for receiving force when cutting the pipe 114 by the cutter 112,
It is rotatably held by 13. The mandrel holder 113 is connected to the cylinder 115 and the guide rail 1
The cylinder 115 is guided by the fitting part 118 and the cylinder 115.
It is now possible to advance and retreat by.

In this device, the cylinder 115 causes the mandrel 110 to
is advanced and protrudes forward from the through hole 120 of the pipe stopper 100, and the pipe 114 is fitted into the mandrel 110 and rotated, and the cutter 1
12 at a predetermined position.

(Problem to be Solved by the Invention) However, in this device, the cutting length of the pipe 114,
That is, setup work such as replacing the positioning tool 108 is required every time the cutting position changes, which has been a hindrance to increasing productivity.

(Means for Solving the Problems) The device of the present invention has been devised to solve these problems, and its gist is (a) that one end surface of a pipe is rotatably abutted; A stopper for positioning and (0)
a mandrel that protrudes from the stopper surface of the stopper and fits into the inner circumferential surface of the pipe; (c) a cutter that cuts the pipe at a predetermined position of the mandrel fitting portion; and (d) rotatably holds the cutter. cutter holder and (*)
The present invention includes a first moving means for moving the cutter holder in the axial direction of the pipe, and a second moving means for moving the cutter holder in a direction perpendicular to the axis of the pipe.

(Operation and Effects of the Invention) As described above, the device of the present invention allows the first moving means to move the cutter in the direction of the axis of the pipe, thereby changing the cutting position with respect to the pipe in the axial direction. The cutting length can be changed.

According to the device of the present invention, when changing the cutting length of a pipe, there is no need to replace the jig for determining the position of the pipe stopper as in conventional devices, and the axis of the cutter is simply moved by the first moving means. All you have to do is change the position in the direction.

In order to change the axial position of the cutter, the amount of movement of the cutter by the first moving means may be controlled by a predetermined control means. For example, when the cutter is moved by a ball screw mechanism, the number of revolutions of the screw may be detected and the cutter may be stopped at a predetermined number of revolutions. In this way, the cutter can be automatically moved a certain distance and stopped there, and there is no need for a special jig for positioning. As a result, the labor required for setup change, which was conventionally required, can be saved, and productivity can be significantly increased.

(Example) Next, embodiments of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, reference numeral 10 denotes a rotary table, the rotary shaft 12 of which is rotationally driven by a motor 16 via a reducer 14.

A plurality of (six in this case) stoppers 18 are fixedly provided on the rotary table 10 at predetermined intervals along the outer peripheral edge. As shown in FIG. 5, these stops/pas 18 are comprised of an outer ring 20 and an inner ring 22, and have a through hole 24 in the center.
is projected forward (radially outward). In this stopper 18, the inner ring 22 has a pipe 28
rotates together with the pipe 28 with one end surface of the pipe 28 in contact with the pipe 28.

As shown in FIG. 3, a plurality of mandrel holders 30 are arranged on the rotary table 10 at positions corresponding to the respective stoppers 18, and these mandrel holders 30 hold a plurality of mandrels 26 having different outer diameters. As clearly shown in FIG. 5, it is rotatably held via a rotating shaft 32.

These holders 30 are provided with downward fitting parts 34, each of which is fitted into a guide rail 36 provided radially on the rotary table 10, and each mandrel holder 30
It is designed to guide the movement in the radial direction.

From each mandrel holder 30, a drive piece 38 is connected to a radial elongated hole 35 provided in the rotary table 10 (see FIG.
(see FIG. 4) and extends downward, and a pair of rollers 40 are fixedly installed at each lower end thereof. As shown in FIG. 2, these rollers 40 sandwich a cylindrical guide rail 44 fixed on a base 42 from both the inside and outside sides, and when the rotary table IO rotates, each mandrel holder 30 is held between the rollers 40. It is designed to guide rotational movement while positioning in the radial direction. Here, the cylindrical guide rail 44 is divided into a main body 46 and a movable part 48, as shown in FIG. 4, and the movable part 48 is moved forward and backward in the radial direction by a cylinder 49. There is.

As shown in FIGS. 1 and 6, an elevating body 50 is disposed on the side of the rotary table 10, and as shown in FIG. It can be raised and lowered by a cylinder 54 below.

This elevating body 50 is provided with a cutter holder 5G, and a cutter 58 is rotatably held by this holder 56.

A cylinder 57 is connected to this cutter holder 56,
The holding body 56 is moved along the guide edge of the guide rail 60 in the left-right direction in FIG. 6, that is, in the axial direction of the pipe 28.

A stopper 62 is also fitted into the guide rail 60. The tip of this stopper 62 is bent to form an abutment part 64, and this abutment part 64 abuts against the cutter holder 56 to define its moving end.

In FIG. 1, FIG. 6, and FIG. 7, 66 is a motor, which is connected to a screw 70 via a belt 68. The screw 70 is threaded into the stopper 62,
The stopper 62 is moved forward and backward based on its own rotation. The amount of rotation of the screw 70 is detected by a detector 72, and the amount of movement of the stopper 62 is automatically controlled.

Next, the operation of this device will be explained.

First, the axial position of the cutter 58 is determined according to the length of the pipe 28 to be cut. The axial position of this cutter 58 is adjusted as follows.

That is, in FIG. 6, the stopper 62 is advanced in the right direction to a certain position in advance, and then the cutter holder 56 is advanced by the cylinder 57 to a position where it abuts the abutting portion 64 of the stopper 62. Since the position of the cutter 58 is determined by the position of the stopper abutting portion 64, the stopper 62 is moved so that the cutter 58 comes to a predetermined position.
Determine the location.

Now, with the position of the cutter 58 determined, the rotary table 10 is rotated, and the plurality of types of mandrels 26 on the table 10 are rotated together with their holders 30. When the mandrel 26 corresponding to the thickness of the pipe 28 to be cut reaches the cutting station for the pipe 28, the table 10 is stopped rotating. At this time, the lower end roller 4 of the drive piece 38 extending downward from the holder 30 of the mandrel 26 that has reached the cutting station
0 sandwiches the movable part 48 of the cylindrical guide rail 44, and when the movable part 48 is advanced by the cylinder 49, its holder 30 is guided by the kite rail 36 on the table 10 and advances, and the held mandrel is moved forward. 26 is made to protrude forward from the center through hole 24 of the stopper 18 fixed to the table 10. At this point, a desired mandrel 26 is selected and set, and the end of the pipe 28 is fitted into this mandrel 26 and rotated by a drive device (not shown). When the cutter 58 is lowered together with the elevating body 50 in this state, the cutter 58
is pressed against the outer peripheral surface of the pipe 28 to cut the pipe 2B. At this time, as the cutter 58 bites into the pipe 28, it becomes necessary to release the cutter 58 in the axial direction by the thickness of the blade of the cutter 58. This device does this as follows. That is, when the blade of the cutter 58 begins to bite into the pipe 28, the stopper 62 is
The cutter holder 56 and the cutter 58 are moved forward by a rotation of 0 to free the cutter holder 56 and cutter 58. At the same time, the cylinder 57 for moving the cutter is made free. If you do it this way,
As the cutter 58 bites into the pipe 28, it becomes possible to freely escape in the axial direction by a distance corresponding to the thickness of the pipe 28, and the pipe 28 can be cut smoothly.

Now, once the cutter 58 has cut the pipe 28, the elevating body 50 is raised to remove the cut portion of the pipe 28.
The same operation as above is performed again to cut the pipes one after another.

On the other hand, when the thickness of the pipe 28 to be cut changes, the mandrel 26 is changed in the following manner in this apparatus. First, the mandrel holder 30 and the mandrel 26 are retracted by the cylinder 49. At this time, the movable part 48 of the guide rail 44 is moved backward and connected to the main body 46 at its retreated end. Therefore, the rotary table 10 is rotated to rotate the plurality of mandrels 26 together with the holder 30, and when the desired mandrel 26 reaches the cutting station, the mandrel 26 is moved through the through hole of the stopper 18 based on the same operation as described above. Make it protrude from 24. Thereafter, the pipe 28 is cut by the same movement as described above.

1 As described above, according to the device of this example, even if the cutting length of the pipe 28 or the thickness of the pipe 28 changes, it can be handled without having to perform two-stage replacement work of jigs, etc. can do. This greatly improves production efficiency.

Incidentally, conventionally, it took about one hour for each set-up change operation, but this device saves that work time.

Furthermore, it becomes possible to fully automate the device, and labor savings are also achieved.

Although the embodiments of the present invention have been described in detail above, the present invention can be constructed and used with various modifications based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of drawings]

Fig. 1 is a front view of a pipe cutting device that is an embodiment of the present invention, Fig. 2 is a front sectional view of a rotary table of the same pipe cutting device and essential parts of the surrounding area, and Fig. 3 is a rotary table of the same cutting device. 4 is a plan view of the mandrel extrusion cylinder and the periphery of the same cutting device, FIG. 5 is a front sectional view of the mandrel 2, the holder, and the periphery, and FIGS. 6 and 7 The figures are a front view and a top view of a mechanism for moving the cutter of the same cutting device, respectively, and FIG. 8 is a schematic structural explanatory diagram of a conventional cutting device. 10: Rotary table 16: Motor 18: Stopper 24: Through hole 26: Mandrel 28: Pipe 30: Mandrel holder 49, 54, 57 Niji cylinder 56: Cutter holder

Claims (1)

[Scope of Claims] (a) A stopper that rotatably abuts and positions one end surface of the pipe; (b) A mandrel that protrudes from the stopper surface of the stopper and fits into the inner peripheral surface of the pipe; (c) a cutter that cuts the pipe at a predetermined position of the mandrel fitting part; (d) a cutter holder that rotatably holds the cutter; and (e) a cutter holder that moves the cutter holder in the axial direction of the pipe. A pipe cutting device comprising: a first moving means; and (f) a second moving means for moving the cutter holder in a direction perpendicular to the axis of the pipe.