JPH0311869B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the production of diagonal members, horizontal members, etc. that are attached to main pillar members, such as steel pipe towers for power transmission lines, and in particular, This is a method for manufacturing a pipe belly material to which a plate is attached, and relates to a method for slitting a pipe in which a slit for inserting a connecting plate can be formed at the same time as cutting the pipe when manufacturing the belly material.

[Prior art]

Conventionally, this kind of processing method is generally known in which the pipe 5 to be processed is cut into a predetermined length using a band saw 6, and then a slit 7 is formed in the cut end by punching or gas cutting. (See FIG. 7) On the other hand, there is also known a method in which gas cutting is used to cut into a predetermined length. In this case, the cutting gas injection direction is in the axial direction of the pipe to be processed 5, and one fixed cutting torch 8 that has stopped moving in both the axial and radial directions is used to move the pipe to be processed 5 in the axial direction. The pipe support section 9 is provided with a pipe support section 9 that can be moved to and rotated around the axis. The cutting of the pipe 5 to be processed into a predetermined length and the formation of the slit 7 are performed by automatically controlling the fixation of the cutting torch 8 and the movement and rotation of the pipe 5 to be processed. (See Fig. 8) [Problems to be solved by the present invention] However, in the former method where the slit 7 is formed by punching or gas cutting, cutting to a predetermined length and forming the slit 7 are performed in different ways. This has to be done manually, which takes time and effort, and increases production costs due to labor costs.

In the latter case, where cutting to a predetermined length is also performed by gas cutting, the cutting and slit forming can be easily done in a short time, but as shown in Fig. 9, it is necessary to drill a large hole 9 at the start. To avoid this, it is necessary to leave the scrap part A. Further, the cutting operation must be performed twice with one cutting torch 8.

In addition, in order to cut two places at the same time using two torches 8, the width of the slits 7 must be the same because the machining of the slits 7 is controlled simultaneously by the rotation of the pipe 5 and the movement of the torches 8. Must be.

Furthermore, since the cutting torch 8 is oriented in the axial direction of the pipe 5 to be processed, the side walls 7a, 7a in the slit forming cross section are not parallel to each other as they face the axial line, as shown in FIG. There were problems such as.

This invention was devised in view of the above-mentioned circumstances, and its purpose is to provide a pipe slitting method that can easily and quickly form a slit in which a connecting plate can be reliably inserted at the same time as the cutting operation. .

[Means for solving problems]

According to this invention, the pipe to be processed can be moved individually in the axial direction and the radial direction.
It is equipped with a main cutting torch and a pipe support part that can rotate the pipe to be processed around its axis, and by automatically controlling each cutting torch and pipe support part, it is possible to operate two cutting torches at the same time. The pipe to be processed is cut to a predetermined length, and slits for inserting connecting plates of different widths and lengths are simultaneously formed at both cut ends using two independently controlled cutting torches during this cutting process. I'll do what I do.

The cutting of the pipe to be processed and the formation of slits can be performed reliably in a short period of time.

〔Example〕

The present invention will be described below based on illustrated embodiments.

In order to cut the pipe 1 to be processed into a predetermined length, as shown in FIGS. 1 and 2, two plasma cutting machines are used which can individually move the pipe 1 to be processed in the axial direction and the radial direction. Torch 2, 2' and
It includes a pipe support part 3 that can rotate the pipe to be processed 1 around the axis.

When cutting the pipe 1 to be processed,
First, the distance between the two cutting torches 2, 2' is widened to a predetermined distance, and by rotating the pipe support 3, the torches cut the pipe 1 to be processed at a predetermined length.

Next, in the process of cutting with the cutting torches 2 and 2', the pipe 1 to be processed is fixed with the pipe support 3 and the cutting torches 2 and 2' are moved to open the connecting plate insertion slit 4. Cut and form.

Note that the pipe axis and radial direction of both cutting torches 2 and 2', that is, X-X and Y- in FIG.
The movement in the Y direction and the turning movement of the pipe support section 3 are performed under automatic control, and the movement of both cutting torches 2, 2' is individually controlled.

The movement of the two cutting torches 2, 2' which are automatically controlled here is shown in FIGS. 3 and 4.
This will be explained in detail using a developed diagram. 3 shows the movement of the cutting torch 2 when cutting one end, and FIG. 4 shows the movement of the cutting torch 2' when cutting the other end.

First, both cutting torches 2 and 2' are moved to the cutting starting point S. Then, at the same time as starting cutting, the pipe to be processed 1 is moved by the pipe support 3 in the direction of
Rotate 180° and cut in the direction of. Thereafter, while the pipe support 3 is rotating the pipe 1 to be processed by 180 degrees, the slits 4 and 4'
The cutting torches 2 and 2' are moved to the point according to the width of the point. This ends the cutting in the direction at point A.

Next, when the cutting in the direction is completed at a point, the rotation of the pipe to be processed 1 on the pipe support section 3 is stopped. The cutting torches 2, 2' are then reciprocated from point to point in the direction of and from point C to point D and point E in the other direction. At this time, when reciprocating from point to point, the pipe 1 to be processed is moved through the slits 4 and 4'.
By turning the slit 4 according to the width of the slit 4, a slit 4 having a circular bottom as shown in the figure is cut and formed. Also, the slit 4 formed here
As shown in FIG. 7, both side walls 4a, 4a of the cross section are parallel to each other because the cutting torches 2, 2' are not oriented toward the pipe axis.

Next, the cutting torches 2, 2' are fixed at the point, and the pipe to be processed 1 is turned by 180 degrees in the direction by the pipe support 3 to perform cutting in the direction. Note that during this 180° rotation, the aforementioned cutting torches 2 and 2' are reciprocating from point to point, so the rotation of the pipe 1 to be processed includes this amount.
While the slit is being rotated 180°, move it to a point that matches the width of slit 4. This ends the directional cut at a point.

Next, cut from point F to point, point, point, point and direction, from the above point to point,
This is done in the same way as point-point-point cutting.

Then, when the cutting is performed in the direction, the cutting portion is reached in the direction at the start of cutting. That is, since the cutting end point J is on the cutting part in the direction, the cutting continues in one round, and the cutting of the pipe to be processed 1 is completed.

In this way, a pipe for the belly material as shown in FIG. 5, which has slits 4 and 4' at both ends for inserting connecting plates into the main material, can be cut in one cutting operation simultaneously with both cutting torches 2 and 2'. Manufactured.

Connecting plates 10 for attachment to the main material as shown in FIG. 6 are attached to the slits 4 formed at both ends of this pipe for the belly material.

In addition, when cutting with both cutting torches 2 and 2', the slit parts can be moved individually when forming the slit, so if the cutting torches 2 and 2' are formed at different times, the connecting plate attached to both ends of the pipe can be moved. It is possible to easily deal with cases where the mounting angles of the slits are different and the slit positions are different at both ends. Also, by changing the moving distance, slits of different lengths can be formed.

[Effects of the invention] By cutting both ends at the same time and slitting with two cutting torches, one pipe is completed each time the pipe is rotated, and the processing time is approximately twice that of the case with one torch. Efficiency increases.

Since the two cutting torches can each be moved independently, even if the widths and lengths of the slits to be formed at both ends are different, they can be formed at the same time.

Each cutting torch can move in the axial and radial directions of the pipe to be processed, so when forming the slit for inserting the connecting plate, the cutting torch is oriented toward the pipe axis compared to conventional torches that cannot be moved in the radial direction. Therefore, both side walls in the slit forming cross section can be made parallel to each other as shown in FIG.

Therefore, the connecting plate can be inserted smoothly.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a cutting device for carrying out the processing method of the present invention, Fig. 2 is a plan view thereof, Figs. 3 and 4 are developed views of a pipe to be processed showing the cutting operation process using a cutting torch, Figure 5 is a perspective view showing the manufactured pipe, Figure 6 is a perspective view showing the connecting plate fitted into the slit of the manufactured pipe, and Figure 7 is a perspective view showing the state in which the connecting plate is fitted into the slit of the manufactured pipe.
The figure is a sectional view showing a slit formed by the method of the present invention, FIGS. 8 and 9 are front views showing the conventional processing method, and FIG. 10 is a developed view showing the pipe to be processed in FIG. 9. FIG. 11 is a sectional view of the slit formed in the pipe to be processed in FIG. 9. 1... Pipe to be processed, 2, 2'... Cutting torch,
3...Pipe support part, 4,4'...Slit.

Claims (1)

[Claims] 1. A method for slitting a pipe, in which a slit for inserting a connecting plate is simultaneously formed at the cut end using a cutting torch that cuts the pipe to be processed into a predetermined length, the method comprising: and two cutting torches that can individually move in the radial direction, and a pipe support part that can rotate the pipe to be processed around an axis, and the distance between the two cutting torches is set at a predetermined distance. The torch cuts the pipe to be processed into predetermined lengths by widening the intervals and rotating the pipe at the pipe support. A method for slitting a pipe, characterized in that the connecting plate insertion slit is cut and formed by fixing the connecting plate and moving the cutting torch.