JPS6359769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application and Summary of the Invention) The present invention provides a so-called non-circular cross section that is continuous in the axial direction, each cross section having the same shape and having a certain angular deviation from each other. The present invention relates to a method for manufacturing a twisted pipe, and by performing cross-sectional shaping and twisting at the same time, the cross-section can be made more uniform than in conventional processing methods.

(Prior art and its problems) Processing of continuous bars with non-circular cross sections twisted in the axial direction has already been reported in
There is one disclosed in Japanese Patent Publication No. 27956 (first conventional example), and the other disclosed in Japanese Patent Publication No. 25-3466 (second conventional example).

In each case, as shown in FIG.
This worm wheel is installed inside the worm 4.
2, a material with a non-circular cross section is inserted into the die 43, and an extrusion force or a pulling force is applied to the material 44 to twist it.

According to this conventional method, the material 44 is twisted in accordance with the rotation while it passes through the die, and this material after passing through the die becomes a torsion rod.

In order to manufacture a torsion pipe using the above-mentioned method as is, the material 44 may be a hollow pipe with a non-circular cross section, and thereby a torsion pipe can be manufactured in the same process.

However, in the case of the method described above, there is a problem that each cross section that is continuous in the axial direction is not uniform. For example, when manufacturing a torsion pipe with a square cross section, as shown in Figure 6, even if the cross section is a regular square in some parts, one side may be concave in other parts. .

In the above-described processing method, the twisting process is performed continuously, but in principle, as shown in FIG. , one holding means 45 is used as a die, and the other holding means is used as a transfer means for pulling out or extruding,
Applying a couple force to each of these pair of holding means,
The processing method is the same as the format.

Therefore, in the case of this processing, as shown in Figure 6,
The bending force F associated with the torsional force acts on the side portions of the cross section of the pipe, causing the side portions to deform into an arched shape.

(Technical Problem) The present invention provides a method for manufacturing a twisted pipe with a non-circular cross section, in order to make the cross section of the completed twisted pipe uniform in each cross section.
The technical problem is to be able to manufacture a twisted pipe in a manner that does not apply twisting force to the pipe.

(Technical Means) The technical means of the present invention taken to solve the above technical problem is that the starting material S is a pipe with a circular cross section, and a plurality of rolls 10,
11 are arranged radially, at least one of these rolls is given a rotational force for feeding the starting material S in the axial direction, this roll is used as a drive roll 10, and while the drive roll is driven, these rolls are The starting material S is fed between the rolls 10 and 11 while the rolls 10 and 11 are rotating.

(Operation) The above technical means of the present invention operates as follows.

Starting material S sent to rolls 10 and 11 groups
is fed while maintaining a constant posture (not rotating), and while passing between the rolls 10 and 11, the starting material is deformed under pressure into a cross-sectional shape that matches the arrangement of the rolls 10 and 11. At the same time, these rolls 10 and 11 are revolved, so
Further, since the drive roll 10 is driven in the feeding direction, this pressurized deformation portion has a spiral shape that matches the revolution speed and the rotation speed of the drive roll 10. That is, each side portion constituting the non-circular cross section continues in the same spiral shape, and a twisted pipe is finally completed.

In other words, the spiral movement of the rolls 10 and 11 processes the circular pipe surface in a constant posture.

(Effects) Since the present invention has the above configuration, it has the following unique effects.

The mechanism of processing twisted pipe is Roll 1
The spiral movement of 0 and 11 can be considered the same as processing a circular pipe into a twisted pipe with a non-circular cross section, so no torsional force acts on the processed part,
The non-uniformity of the cross section, which is conventional, can be eliminated. Furthermore, each side of the non-circular cross section does not have an arched concave shape.

Furthermore, since the starting material S has a circular cross section, the feeding posture of the starting material may be constant, and the force required to maintain this constant posture may be zero or a small amount, and it can be continued with the round pipe manufacturing process. It has the advantage of being able to perform leverage processing.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

As shown in Fig. 1, the apparatus of this embodiment has a process for processing a twisted pipe following the round pipe manufacturing process, and in order to improve the accuracy of this twisting process, the twisting process is divided into multiple steps. It is divided,
While the starting material S passes from the first twisting device A to the nth twisting device N corresponding to each step, the round pipe is finished into a twisted pipe with a square cross section.

Each twisting device has a configuration as shown in FIGS. 2 and 3, and in this embodiment, in order to form a rectangular cross section, a combination of two drive rolls 10, 10 and two rolls 11, 11 is adopted, These rolls are arranged radially on one side of a rotary disk 1 rotated by a worm gear device 2, and a planetary gear device 3 is provided on the other side of the rotary disk.

The worm gear device imparts a revolving motion to each roll, and the rotational force transmitted from the first motor 21 to the worm wheel 23 via the worm 22 is transmitted to the cylindrical shaft 12 integrated with the rotary disk 1, As a result, each roll provided on the rotary disk 1 is caused to revolve.

The cylindrical shaft 12 is for inserting a processing pipe which has been twisted by a roll group consisting of drive rolls 10, 10 and free rolls 11, 11, and passes through the worm gear device 2 to pass through the processing pipe downstream of the processing process. sent to the side.

Next, the planetary gear device 3 has a second motor 3 attached to the base 24 of the worm gear device 2, which is a fixed part.
It is for transmitting the driving force of 1 to the drive rolls 10, 10, and is rotatably supported by four support rolls 32, 32 arranged on the circumference concentric with the cylinder shaft 12, and these support rolls. ring gear 33
and an internal gear 35 that meshes with the internal teeth 34 of this ring gear and is transmitted to the drive roll 10 via the bevel gear 25, and an internal gear 35 that meshes with the external teeth 36 of the ring gear and is attached to the output shaft 37 of the second motor 31. It consists of a combination with external gear 38.

With this combination, the rotational drive amount of the second motor 31 is transmitted to each of the drive rolls 10, 10 through a transmission path of external gear 38→ring gear 33→internal gear 35→bevel gear 25.

Therefore, if the rotation speed of the first motor 21 is set according to the degree of twist of the torsion pipe, and the rotation speed of the second motor 31 is set to a predetermined value under the condition that the rotation speed of the first motor 21 is taken into account, The feed speed of the drive rolls 10, 10 is set according to the degree of twisting, and the twisting process described above becomes possible.

In this embodiment, the above-described twisting devices are provided in multiple stages, and the drive roll 10 of each device is
And the degree of processing by the free roll 11 is sequentially changed. Therefore, in this embodiment, the degree of work in each twisting device is set optimally, and processing defects due to excessive degree of work in one step do not occur.

Furthermore, in this twisting device, the drive roll 1
Bearing frame 1 for 0, 10 and free rolls 11, 11
3 are freely adjustable on the roll frame 14 provided on the rotary disk 1, and the flat portion 15 on the outer peripheral surface of each roll is adapted to the length of each side of the cross section of the finished product, so that they have the same configuration. By simply preparing a plurality of twisting devices and adjusting the roll position of each twisting device, the above-mentioned twisting process can be performed in multiple steps.

Next, the roll device for manufacturing round pipes is a known one, and roll devices R are provided in multiple stages, and the strip H is passed from the first roll device a to the nth roll device n. When bent, it is bent into a cylindrical shape, and when the joint is welded, a welded pipe with a round cross section is produced.

In the twisted pipe manufacturing process that includes a combination of this series of roll devices and the plurality of twisting devices, it is possible to continuously manufacture everything from steel strips to twisted pipes. Further, the round pipe is held in a constant posture during twisting, and no special posture holding means is required. Although the method for manufacturing a torsion pipe with a quadrilateral cross section has been described above, the method of the present invention can also be implemented to manufacture a torsion pipe with a polygonal cross section or a torsion pipe with a non-circular cross section other than a polygon. In this case, drive rolls 10, 10 and free rolls 11, 11
The shape or number may be set to a predetermined shape and number.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the apparatus for carrying out the method of the present invention, Fig. 2 is a front view of the twisting processing apparatus used therein, Fig. 3 is a sectional view thereof, and Fig. 4 is a main part of the conventional example. An explanatory diagram, FIG. 5 is an explanatory diagram of the principle of this twisting process, and FIG. 6 is an explanatory diagram showing the state of deformation of the cross section in the case of this twisting process. In the figure, 10...drive roll, 11...free roll, S...Starting material.

Claims (1)

[Claims] 1. In a method for manufacturing a twisted pipe with a non-circular cross section, the starting material S is a pipe with a circular cross section, a plurality of rolls 10 and 11 are arranged radially in accordance with each side of the completed cross section, and at least one of these rolls has a starting material S. A rotational force is applied to feed the material S in the axial direction, and this roll is used as a drive roll 10,
While driving the drive roll, these rolls 1
With rolls 0 and 11 revolving, rolls 10 and 11
A method for producing a twisted pipe in which a starting material S is fed between the pipes.