JPH0366967B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an electric resistance welded pipe forming method in which a band plate is formed into a cylindrical shape and then rolled down in the circumferential direction of the pipe using fine pass rolls to finish form the base pipe. and equipment, in particular:
The present invention relates to an electric resistance welded tube forming method and apparatus suitable for application to a process of forming an electric resistance welded tube using cage rolls.

[Prior Art] Generally, an electric resistance welded tube by cage roll molding is manufactured as follows. That is, Figures 1 and 2
As shown in the figure, the strip-shaped molded material 1 is formed at the initial stage of molding.
After being sequentially formed into a cylindrical shape in the intermediate preforming roll unit 2, breakdown roll unit 3, edge forming roll unit 4, and cage roll unit 5, it is rolled down in the circumferential direction in the fin pass roll unit 6. By doing so, while stably forming the edge portion 1a, a blank tube having a predetermined shape and size is finished. In Fig. 2, A is the cross-sectional shape of the molded material 1 passing through the preforming roll unit 2, B is the cross-sectional shape of the molded material 1 passing through the breakdown roll unit 3, and C is the edge forming roll. The cross-sectional shape of the molded material 1 passing through the unit 4; It shows a state where it changes into a cylindrical shape.

In the cage roll forming mentioned above, usually,
As shown in FIGS. 3 to 5, so-called downhill molding is performed in which the central portion 1b of the molded material 1 is lowered to the baseline L as molding progresses, and the edge portion 1a of the molded material 1 and the center By reducing the difference in the length of the trajectory followed by the edge portion 1b, the longitudinal elongation of the edge portion 1a is suppressed, and furthermore, by using a large number of continuous outside cage rolls 7 (see FIG. Smooth bending is performed with continuous restraint support.

By the way, in the above-mentioned electric resistance welded tube forming apparatus, it is necessary to adjust the position of the outside cage roll 7 in accordance with the tube size, and for this reason, an apparatus having a configuration as shown in FIG. 6 has been developed. That is,
Left and right stools 9 are fixed on a common base 8 fixed on the foundation so as to be located below the molding material passing line, with the molding material passing line sandwiched therebetween. A guide mechanism 10 extending along the slope is fixed to an inclined surface that slopes from above to below from the forming material passing line side toward the forming material passing line, and a moving mechanism 12 is attached to the left and right guide mechanism 10. The left and right guide mechanisms 10 are engaged so as to be movable along the left and right guide mechanisms 10.
A driving device 11 for moving the moving mechanism 12 along the guide mechanism 10 is provided in the left and right moving mechanism 1.
2, a cage roll 7 having an axis extending in the vertical direction is supported so that the axis of the cage roll 7 can be tilted about an axis extending substantially parallel to the forming material passing line, and a left-right moving mechanism 12 An angle adjustment mechanism 13 for tilting the axis of the cage roll 7 is provided in the cage roll 7.

According to such an electric resistance welded tube forming apparatus, as shown in FIGS. 7 and 8, by driving the drive device 11,
By moving the moving mechanism 12 along the guide mechanism 10, the cage roll 7 is moved along the inclined line 10.
A and 10b can be moved linearly and brought into contact with the molded material 1 in accordance with the pipe size.

However, as shown in Figure 3, this applies when the amount of downhill is constant (usually 1D, where D: pipe diameter), and when the amount of downhill changes (see the virtual line), there is a drawback that it can no longer be handled. It was hot. That is, once the downhill amount and the formed flower (the locus of the edge portion 1a in FIG. 5) are determined, the mechanical system is determined, and the angles of the slope lines 10a and 10b are determined. Therefore, if the downhill amount is changed depending on the wall thickness, material, grade, pipe size, etc. of the molded material 1, the above-mentioned conventional apparatus cannot cope with the change.

[Object of the Invention] The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to make it possible to cope with changes in the downhill amount of a molded material.

[Structure of the Invention] In order to achieve the above object, in the ERW tube forming method of the present invention, the left and right cage rolls 7, which have vertically extending axes and face each other across the forming material passage line, are The left and right cage rolls 7 are moved toward or away from each other along an inclined line that slopes from above to below from the forming material passing line side to the forming material passing line side, and the left and right cage rolls 7 are moved toward or away from each other in the horizontal direction. The axes of the left and right cage rolls 7 are tilted so that the upper ends of the left and right cage rolls 7 approach each other, and the left and right cage rolls 7 are moved to a position commensurate with the amount of downhill according to the characteristics of the molded material 1, thereby molding the molded material 1. .

In addition, in order to achieve the above object, in the electric resistance welded pipe forming apparatus of the present invention, guide members 14 are fixed to the left and right upper surfaces of the common base 8 installed below the forming material passage line, and a stool is attached to the left and right guide members 14. Worm jacks 15 are provided at the left and right ends of the common base 8 to move the left and right stools 9 toward and away from each other. The same motor 16 is connected via a bevel gear mechanism 17, and a guide mechanism 10 is fixed to the mutually opposing surfaces of the left and right stools 9, tilting from above to downward from the side opposite to the forming material passing line toward the forming material passing line. , the moving mechanism 12 is engaged with the left and right guide mechanism 10 so as to be movable along the guide mechanism 10, and the left and right guide mechanism 10
A driving device 11 for moving the moving mechanism 12 along the guide mechanism 10 is provided in the left and right moving mechanism 1.
2, a cage roll 7 having an axis extending in the vertical direction is supported so that the axis of the cage roll 7 can be tilted about an axis extending substantially parallel to the forming material passing line, and a left-right moving mechanism 12 An angle adjustment mechanism 13 for tilting the axis of the cage roll 7 is provided.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 9 shows the ERW tube forming apparatus of the present invention. In the ERW tube forming apparatus shown in FIG. The stools 9 are slidably engaged with the respective guide members 14, and the worm jacks 15 are mounted facing each other on the left and right ends of the common base 8, and the worm jacks 15 are connected to the motor 16. By driving the stools 9, 9 synchronously through the bevel gear mechanism 17, transmission shaft 18, etc.
The cage rolls 7, 7 can be moved apart from the molded material 1.
The structure is such that the position can be adjusted in a direction perpendicular to the passing line.

Next, the operation will be explained.

Now, in FIG. 10, as shown by the solid line, from the position where the formed material 1 of large diameter pipe size is being rolled down,
When moving and adjusting the cage roll 7 to a position where the formed material 1 of a small diameter pipe size is rolled down when the downhill is constant at 1D as shown by the two-dot chain line, the driving of the drive device 11 is Therefore, this can be achieved by moving the cage roll 7 from the position indicated by the solid line to the position indicated by the two-dot chain line through the movement of the moving mechanism 12 along the set inclination line 10b.

On the other hand, when adjusting the position of the cage roll 7 in response to the formed material 1 of a large diameter pipe size whose downhill has changed as shown by the dashed line, the drive device 11
The cage roll 7 is once moved along the inclined line 10b from the position indicated by the solid line to the position indicated by the broken line, and then the worm jack 15 is operated by driving the motor 16, and the stool 9 is moved along the guide member 14. It is moved away from the molding material 1 in a direction perpendicular to the passage line thereof. As a result, the cage roll 7 moves from the position indicated by the broken line to the position indicated by the dashed-dotted line, and the position is adjusted. Incidentally, this moving work may be performed in the reverse process, and the cage roll 7 may finally be brought to the position indicated by the dashed-dotted line.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the present invention, the position of the cage roll 7 can be moved and adjusted in response to changes in downhill, so the range of capability to accommodate various pipe sizes is expanded, and production is improved. It has excellent effects such as contributing to improved performance and facilitating automation and remote control.

[Brief explanation of drawings]

Fig. 1 is a side view showing the tube forming process of the cage roll type ERW tube forming equipment, Fig. 2 is an explanatory diagram of the cross-sectional shape of the forming material in the tube forming process, and Fig. 3 is the forming state and 4 is a plan view of FIG. 3, FIG. 5 is a front view of FIG. 4, and FIG. 6 is a schematic front view of a conventional electric resistance welding pipe forming apparatus. 7 and 8 are explanatory diagrams showing the positions of cage rolls for forming materials of different pipe sizes in the apparatus of FIG. 6, FIG. 9 is a schematic front view of the ERW tube forming apparatus of the present invention, and FIG. FIG. 3 is an explanatory diagram showing a cage roll adjustment method in the apparatus of the present invention. 1 is a molded material, 7 is a cage roll, 8 is a common base, 9 is a stool, 10 is a guide mechanism, 11 is a drive device, 12 is a moving device, 13 is an angle adjustment mechanism, 14 is a guide member, 15 is a worm jack, 16 is a motor, 17 is a bevel gear mechanism, 18
indicates the transmission axis.

Claims (1)

[Claims] 1. Left and right cage rolls 7 having vertically extending axes and facing each other across a forming material passing line,
The left and right cage rolls 7 are moved toward or away from each other along an inclined line that slopes from above to below from the side of the anti-forming material passing line toward the forming material passing line side, and the left and right cage rolls 7 are moved toward or away from each other in the horizontal direction. The axis of the roll 7 is tilted so that the upper ends of the left and right cage rolls 7 approach each other, and the left and right cage rolls 7 are moved to a position commensurate with the amount of downhill depending on the characteristics of the molded material 1.
A method for forming an electric resistance welded tube, characterized by forming a forming material 1. 2. Guide members 14 are fixed to the left and right upper surfaces of the common base 8 installed below the molded material passage line, and the stools 9 are engaged with the left and right guide members 14 so that they can slide toward and away from each other. Worm jacks 15 are provided at the left and right ends of the base 8 for moving the left and right stools 9 toward and away from each other.
The same motor 16 is connected via a bevel gear mechanism 17, and a guide mechanism 10 is provided on the mutually opposing surfaces of the left and right stools 9, and is inclined from above to below from the side opposite to the forming material passing line toward the forming material passing line.
a driving device 1 for fixing the moving mechanism 12 to the left and right guide mechanisms 10 so as to move the moving mechanism 12 along the guide mechanism 10;
1 is provided in the left-right moving mechanism 12 so that the cage roll 7 having an axis extending in the vertical direction can be tilted about an axis whose axis extends substantially parallel to the forming material passing line. An electric resistance welded tube forming apparatus characterized in that an angle adjustment mechanism 13 for supporting and tilting the axis of a cage roll 7 is provided in a left-right moving mechanism 12.