JPH07265943A - Forming equipment for forming spiral tube manufacturing machine - Google Patents

Abstract

PURPOSE:To provide a forming equipment of a spiral tube manufacturing machine taking into consideration the minimization of the row and the optimum arrangement of the guide rolls. CONSTITUTION:In a forming equipment of a spiral tube manufacturing machine to manufacture a tube Wb by welding a butt part while the strip Wa as a stock is continuously formed into the spiral shape, three rows of outer surface guide rolls 13a, 13b, 13c which bend the strip Wa by pyramid forming rolls 2a, 2b, 2c and guide it to the prescribed tube diameter are provided with the prescribed distance away from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaping device for a spiral pipe manufacturing machine.

[0002]

2. Description of the Related Art A conventional molding apparatus for a spiral pipe manufacturing machine is shown in FIGS. According to this, the forming section 1 has three rows of pyramid-type forming rolls 2 for bending the band steel Wa.
a, 2b and 2c and 6 to 7 rows (7 rows in FIG. 4) of outer surface type guide rolls 3a, 3b, 3 which guide the pipe Wb to a predetermined diameter after bending with these forming rolls 2.
Pipe Wb in which c, 3d, 3e, 3f and 3g are molded
Are provided along the circumferential direction.

The forming roll 2a is fixed to the bed 4 at the position where the strip steel Wa is inserted, and the forming roll 2b is formed on the vertical surface of the bracket 8 attached to the bed 4 on the forming roll 2c.
Is attached to the bed 4 so as to be movable in the direction of the arrow written for each forming roll 2b, 2c.
Therefore, the forming rolls 2b and 2c are moved according to the plate thickness of the strip steel Wa to be formed and a predetermined pipe diameter, and the strip steel W is moved.
Set a at a position where it is bent to a predetermined diameter.

The outer guide rolls 3a are placed on the bed 4, the outer guide rolls 3b and 3c are placed on the stand 5 which moves horizontally on the bed 4, and the outer guide rolls 3d and 3e are placed on the stand 5.
And 3f are arms 6 that move up and down along the vertical surface of the stand 5.
Further, the outer surface type guide rail 3g is mounted on the arm 7 mounted on the bed 4 so as to be movable in the directions of the arrows marked for each of the outer surface type guide rolls 3a to 3g. Therefore, these outer surface type guide rolls 3
A to 3 g are moved according to a predetermined pipe diameter, and the strip steel Wa bent by the forming roll 2 is set at a position where it is guided to the predetermined pipe diameter.

Each forming roll 2 and outer surface type guide roll 3
Is composed of a split roll (roller) 10 shown in FIG. 7 whose angle can be adjusted in parallel with the bending width of the pipe (coil) shown in FIG.

[0006]

The conventional molding apparatus for the spiral pipe manufacturing machine shown in FIGS. 4 and 5 has the following problems. Conventionally, 6 to 7 rows and a large number of rows are conventionally provided in the circumferential direction of the pipe Wb on which the outer surface type guide roll is formed, and the outer surface type guide rolls in each row are parallel to the strip steel inserting direction as described above. Since a plurality of split rolls whose angle can be adjusted are installed, the number of parts increases and the structure becomes complicated. Therefore, the cost is high, maintenance is time-consuming, and it takes time to set these split-type rolls according to the diameter of the pipe to be formed. There was a problem that the risk of entering would increase.

The present invention addresses these problems by providing:
(EN) Provided is a forming device for a spiral pipe manufacturing machine, which takes into consideration the minimum number of guide roll rows and the optimal arrangement.

[0008]

In order to solve the above-mentioned problems, the present invention is constructed as follows. 1) In a forming apparatus of a spiral pipe manufacturing machine for manufacturing a pipe by welding abutting parts while continuously forming a strip steel into a spiral shape, the strip steel is bent and then guided to a predetermined pipe diameter. There are two or three rows of outer guide rolls. However, in the case of two rows, the outer surface type guide rolls in the central row of the three rows of outer surface type guide rolls are omitted.

2) The two rows on the left and right sides of the central row of the three rows of outer surface type guide rolls are arranged at intervals of 40 ° to 55 ° in the circumferential direction of the pipe to be formed.
The outer surface type guide rolls in the central row are installed above the forming rolls in the vertical direction (installed at about 180 ° apart from the forming rolls).

[0010]

The molding apparatus of the spiral pipe manufacturing machine of the present invention is constructed as described above and has the following functions. 1) In FIG. 6, the rollers 10 of the outer surface type guide rolls 13b in the center row of the outer surface type guide rolls 13 in three rows are vertically above the central forming roller 2b of the pyramid forming roller 2 or 180 ° forming roller in the pipe forming direction. Since it is installed at a position apart from 2b and in contact with a predetermined pipe diameter, the strip steel Wa which is bent by the pyramid forming roll 2 and is about to travel along the circumferential direction of the predetermined pipe diameter due to its rigidity is set to the predetermined length. Holds the pipe diameter of.

2) The outer surface type guide rolls 13 in the first row on the strip-steel insertion side with respect to the outer surface type guide rolls 13b in the central row.
By disposing and supporting a at a position parallel to the bottom side BC through the center of gravity position G of the triangle ABC obtained by expanding the coiled steel strip Wb, separation and collision of the abutting portion to be welded Since (the following movement) is prevented, the strip steel Wa does not move from the position of the final roll 2c of the pyramid type forming roll 2 to the welding position. If the forming roll 2c is, for example, a position rotated by 27 ° in the pipe forming direction from the forming roll 2b, the position passing through the theoretical center of gravity G and parallel to the bottom side BC is 27 ° + (360 ° -27) from the forming roll 2b.
°) × 1/3 = 138 ° It is in a position rotated in the pipe molding direction. This position (position 13a) is 180 ° -138 ° from the outer surface type guide roll 13b at a position rotated by 180 ° in the pipe forming direction from the forming roll 2b to the strip steel insertion side.
= 42 ° rotated. As a result of testing by changing the support position on the model machine, it was found that the optimum position was around 45 °. Therefore, the outer surface type guide roll 13a in the first row
Is 40 ° to 55 °, the movement of the abutting portion can be prevented depending on the position of the forming roll 2c.

3) The guide roll 13c in the third row in the pipe forming direction of the outer surface type guide roll 13b in the center row is set to 1
By arranging the outer surface type guide rolls 13a in the first row in a position almost symmetrical (the axis of symmetry is the outer surface type guide roll 13b in the central row), the outer action by the spring action of the steel strip Wa of the outer surface type guide rolls 13a in the first row is performed. The horizontal force component of the holding force for holding the pipe in a predetermined direction is canceled against the force of spreading toward one side, and the abutting part of the formed coil-shaped strip steel Wa is the impact of the existing strip steel Wa. Since it does not move from the joint, welding at the joint is good.

4) Since the outer surface type guide rolls are provided in three rows, the number of rows is less than half the number of rows of the conventional outer surface type guide rolls, the number of parts is reduced, and the structure is simplified.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2 show a front view and a plan view of a forming device of a spiral pipe manufacturing machine. In these figures, the forming section 11 includes three rows of pyramid-shaped forming rolls 2a, 2b and 2c for bending the strip steel Wa, and these forming rolls 2 guide the pipe Wb after bending to a predetermined diameter. Three rows of outer surface type guide rolls 13a, 13b and 13c are provided, and a forming roll 2b and a central outer surface type guide roll 13b are provided.
Are installed at 180 ° intervals, and the outer surface type guide rolls 13a and 13c on the left and right sides are 40 ° to 55 ° in the circumferential direction of the pipe formed on the left and right sides respectively with respect to the outer surface type guide roll 13b. They are set in separate positions.

The guide rolls 13a, 13b and 13c are arranged so that the outer guide rolls 13a, 13b and 13c can be moved to the above-mentioned positions according to the diameter of the pipe.
However, the inlet side frame 17 and the outlet side frame 15 of the molding unit 11
Brackets 17a, 17b and 1 of the beam 16 which are provided between the beam 16 and move up and down along the vertical surface of the exit frame 15.
The outer surface type guide roll 13a (13c) attached to the screw shaft 7c is rotated by the motor 18a (18c) provided on the bracket 17a (17c).
9a (19c) has a female screw portion to be screwed, and a screw shaft 19a
The guide surface 21a (21c) of the beam 16 parallel to (19c)
slide block 20a (20) moving along c)
c) and the outer surface type guide roll 13
b is fixed to the bracket 17b.

The output frame 15 side of the beam 16 has a screw shaft 22 rotated by a motor 21 provided on the output frame 15 and a screw portion screwed to the screw shaft 22. Slide block 2 that moves up and down along the surface
3 on the side of the entrance frame 17 of the beam 16, a screw shaft 27 driven by the screw shaft 22 via the gear box 24, the connecting shaft 25, and the gear box 26, and a screw portion screwed to the screw shaft 27. Since the blocks 28 included therein are fixedly mounted, both sides of the beam 16 move up and down synchronously.

Further, the outer surface type guide rolls 13a, 13
In b and 13c, as shown in FIGS. 2 and 6, the split roll 10 is inclined so as to be parallel to the strip steel insertion direction,
Each of the outer surface type guide rolls 13a, 13b and 13c is provided with three, one and two division type rolls 10, respectively.

In FIG. 6, the coiled steel strip Wa is restrained by a continuous pipe (a pipe manufactured by welding the abutting portion) supported by the support rolls 30 and a formed pipe (welded coiled pipe). Steel strip) is a support roll 30
Until it enters, the first winding state (first at 10-1 of split roll 13a (10-1 of 13a and 10-2 of 13a for wide band steel Wa, the same hereinafter) and 10 of split roll 13b (first 10-1 of the split type roll 13a, the split type roll 13
It is enough to guide with 10 of b and 10-1 of the split roll 13c. Until the forming pipe enters the support roll 30, and in the initial winding state, all of the split rolls 10 described above also have a function of fixing the axial center of the forming pipe and suppressing springback of the strip steel Wa, respectively.

On the other hand, the pyramid type forming rolls 2a, 2b and 2c are mounted on the bed 14 so as to be movable in the directions of the arrows as in FIGS. Therefore, the forming roll 2 can move the position of each roll according to the plate thickness of the strip steel Wa and the diameter of the pipe Wb to be formed, and the outer surface type guide roll 13 according to the diameter of the pipe to be formed. ,
The coil-shaped strip steel Wa bent to a predetermined diameter by the forming roll 2 is bent and then subjected to the outer surface type guide rolls 13a and 13b.
And 13c are guided along a predetermined pipe diameter, and free movement of the coiled steel strip Wa is prevented so that the abutting portions to be welded are not separated.

Further, as shown in FIG. 3, segments (shoes) 12a, 12b and 12c may be attached instead of the outer surface type guide rolls 13a, 13b and 13c.

[0021]

Since the present invention is constructed as in the embodiment described in the preceding paragraph, the number of rows is less than half the number of rows of the conventional outer surface type guide rolls, the number of parts is reduced, and the structure is simplified. Therefore, the cost is low, maintenance is short, and it does not take much time to set the position of the split type roll that constitutes the outer surface type guide roll according to the diameter of the pipe to be formed,
Furthermore, there is almost no risk that the outer surface of the molded pipe will be damaged by the split rolls.

The positions of the central guide rolls of the three rows of outer surface type guide rolls are set to be separated by about 180 ° from the position of the pyramid type forming rolls, and the guide rolls on the left and right sides of the central guide rolls are respectively 40 ° to 55 °. Since they are arranged apart from each other, not only can the bent steel strip be guided by the forming roll along a predetermined diameter of the pipe, but also the movement of the abutting portion of the bent steel strip can be prevented, and a good pipe can be obtained. You can now create.

[Brief description of drawings]

FIG. 1 is a front view of a molding device of a spiral pipe manufacturing machine according to a first embodiment of the present invention.

FIG. 2 is a plan view of the molding apparatus.

FIG. 3 is a front view of a main part of a molding apparatus according to a second embodiment of the present invention.

FIG. 4 is a front view of a molding device of a conventional spiral pipe manufacturing machine.

FIG. 5 is a side view of the molding apparatus.

FIG. 6 is an explanatory view showing an arrangement of a forming roll and an outer surface rolling contact type guide roll which are bent into a predetermined pipe diameter after the strip steel is inserted and are guided along the pipe diameter.

FIG. 7 is a cross-sectional view of a split roll.

[Explanation of symbols]

 11 forming device 12a, 12b, 12c segment (shoe) 13a, 13b, 13c outer surface type guide roll 15, 17 inlet side and outlet side frame 16 beam 17a, 17b, 17c bracket 2a, 2b, 2c forming roll

Claims (2)

[Claims] 1. A forming apparatus of a spiral pipe manufacturing machine for producing a pipe by welding abutting portions while continuously forming a strip steel into a spiral shape, and guiding the strip steel into a predetermined pipe diameter after bending the strip steel. 2 outer guide rolls
A forming device for a spiral pipe manufacturing machine, characterized by having three or three rows. 2. The two rows on the left and right sides of the central row of the three rows of outer surface type guide rolls are arranged at intervals of 40 ° to 55 ° in the circumferential direction of the pipe to be formed. Spiral pipe forming machine.