JPS6010814B2 - Metal welded pipe manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an apparatus for manufacturing a metal tube by welding the end faces of metal plates formed into U and O shapes.

Conventionally, there is a known method for manufacturing steel pipes, especially Dairyukae, by forming a steel plate into a U shape using a U press, and then welding the tubular steel plates, which were further formed into a 0 shape using an 0 press, with green butt edges, and has been improved. There have also been proposals to do so.

The above-mentioned U forming and O forming can be applied not only to steel pipes but also to other types of metal pipes. Compatible molds have been prepared and used by replacing them. Also, U molding and ○ molding were performed separately,
Next, a perfect circle is made, a joint is attached, tack welding is performed, and after the next welding, strain relief, sintered anchor or expander processing is performed.The present invention is applicable not only to large pipes but also to various types of Regarding the manufacture of metal tubes of different diameters, we have improved the conventional technology described above to make the forming process easier and simpler. Another object of the present invention is to provide a manufacturing apparatus for metal welded pipes that can be used for general purposes.

Next, an outline of the present invention will be explained. The present invention modifies the process used in conventional methods. That is, - edge bending process to improve the shape of the seam, ○ U-forming for forming, ○ forming process to achieve roundness, ○ process during forming to obtain a joint, and welding or phosphorus. The process of using an expander, etc. to remove the distortion of a blunt object has been changed to ``The present invention is equipped with an upper mold body equipped with a liquid cylinder mechanism and a semi-cylindrical punch for operating the mold body and its required parts, and a tilting plate die. It is combined with a mechanism including a pair of molding devices consisting of a lower mold body.
The semi-cylindrical punch consists of a pair of semi-cylindrical bodies that are symmetrical with each other at a predetermined interval, and is equipped with a mechanism that allows the interval to be adjusted. A completed pipe is obtained by combining the steps of forming, single-bevel forming, tacking, and welding, shortening, and giving an appropriate shape using a circular press straightening mechanism equipped with a circular shape. More detailed explanation is as follows.

In the present invention, forming is carried out by using a punch of the present invention and an upper mold body that supports its operating mechanism, a lower mold body that supports the punch plate to be processed, and a lower mold body that supports its operating mechanism. . The lower mold body is made up of a lower plate mold that is symmetrically divided into a pair of left and right symmetrical positions, and its support plate and operating mechanism are fixed to the plywood main body. The upper body including the punch described above is
A split punch with semicircular protrusions divided symmetrically in a pair of left and right symmetrical positions, and a shaft that supports the split punch and a shaft that supports the split punch.
This split punch and an operating part that supports the shaft and operates horizontally, vertically, and vertically are fixed to each other. The above-mentioned downward slope type is a shaft in which the blank plate to be processed is mounted on a plane with an inclined forehead, the left plate and the right plate are arranged at a predetermined variable interval, and the inner end is fixed to the support plate. The locks are fitted at right angles so that they can be rotated freely and maintained at a constant position.

This is a shaft that fixes the telescopic end of the cylinder mechanism for operating the mold to the outer end of the lower plate mold, and is engaged at right angles so that the ring can be rotated and maintained at a constant position. It is a shaft that fixes the other end of the lower plate type actuating cylinder mechanism part to the plywood on the main body, and competes at right angles to enable rotation of the circumference of the ball and to maintain a constant ball position. a process in which the lower mold body, including said mechanism, operates in conformity with the upper mold body such that it can move towards the center on a fixed plane and maintain or change a fixed relative position; establish.

In the upper body of the present invention, a shaft with a circular cross section is vertically divided into two equal semicircular bodies, each semicircular body is fixed to the lower end of a support shaft, and the upper end of the shaft is connected to a respective cylinder mechanism for left and right movement. The mechanism is fixed to the upper body.

The semicircular punch protrusions are designed to have left and right sides that can be brought close together, in close contact, or with difficulty depending on the needs that arise during the molding process, and that can provide or maintain arbitrarily selected symmetrical spacing, position, and movement. A pair of cylinder mechanisms is provided and fixed to the upper body.A cylinder mechanism and a support portion for the upper body are provided at the upper part of the body so that the upper body including the punch can move up and down. An embodiment will be described based on the drawings. Fig. IA is a side view of one embodiment of the present invention, and Fig. IB is a side view of one embodiment of the present invention.
The figure is a front view of the same, Figure 2A is a layout plan view, Figure 2B is a standard front view showing the relationship between bending and load, Figures 3A and 3B
3C are front sectional views showing the molding process of one application example. Figures 4A, 48, 4C, and 4D are front sectional views showing the forming process of other applied examples, Figure 5A is the welding process, and Figure 5B is the front view showing the round forming process. Cross-sectional view. First, FIG. IA and FIG. IB will be explained.

In the present invention, plywood is equipped with wheels for movement as necessary.
A lower mold body is provided symmetrically on the lower mold stand 9 placed at 01,
The lower mold body is fixed to a stand 9 by a support frame 6, and the support frame 16A at one end of the lower mold body 5 is rotatably iron-coupled around the shaft 16 with a shaft 16, and the support frame 15A at the end is The koji 15 is rotatably fitted around the shaft 15 with a shaft 15, and the koji 15 is fitted with one end of the fixed end of the fluid cylinder mechanism 7 fixed to the stand 9 by the shaft. Due to the extension of the cylinder mechanism 7, the surface of the lower mold body 5 becomes a fulcrum with the support frame 16A keeping the alignment around the shaft 16, and similarly pushes up the support frame 15A while keeping the alignment around the shaft 15. , move in an inclined manner (see Fig. 38, etc.). In addition, the lower plate type 5 has a structure that allows it to slide toward the center and set the interval between the left and right plates to a predetermined value, and the lower plate type 5 can move from a horizontal position to a vertical position while also allowing the gap between the left and right plates to be set to a predetermined value. A mechanism is used in which the horizontal and vertical movements can be performed by expanding and contracting the fluid cylinder machine 7. See Figure 3B, Figure 40, etc. As illustrated in FIG. IB, the upper mold body of the present invention uses a punch 3 fixed to the end of a support shaft 2 and having semicircular protrusions 3A and 3B on the outside as shown in the figure. is mounted and supported on the upper body 1.

The upper body 1 is attached to a horizontal frame 8 supported by struts 10 fixed to a plywood board 01 with fixing members 11, and also has a fluid cylinder mechanism 4, so that the upper body 1 can be moved up and down using the mechanism 4. In addition, the upper body 1 has both fluid cylinder mechanisms IA and IB symmetrically, and the mechanism IA has a shaft 2 and a punch 3 fixed to the end of the shaft 2, and similarly, the mechanism IB is the same machine and has a symmetrical part. A mechanism is provided in which a shaft and a punch are set, and the space between both semicircles can be moved from side to side as needed, and they can be moved in conjunction with each other so as to stop at a predetermined position. As shown in Figure iA, the length of the punch 3 is appropriate for bending a curved surface with a semicircular cross section into a pipe by contacting the plate to be bent, and then press the punch 3 with one touch to the plate to be bent. As shown in Figures 3C, 4C, and 4D, and finally as shown in Figure 5A, the end is bent and the curved plate is shaped into a nearly circular shape to form the next molten acid pipe. An embodiment of the process arrangement of the present invention is shown in FIG. 2A.

A metal plate to be bent into a pipe to be welded having a predetermined shape and size is placed in a vacuum bag from a pipe material plate storage area A, and placed in a bending part C. The punch is moved from the resting position B of the upper body including the punch to the bending part C, and the punch of the upper body and the lower plate of the lower body are fully utilized by combining the fluid cylinder mechanisms provided in both. Next, the tack welding machine is moved from the rest position E to the bending part C, and tack welding is performed to produce a semi-finished product that maintains the shape of the molded object, and then transported to storage site D. Next, the case of one embodiment shown in FIGS. 3A, 3B, and 3C will be described.

The symmetrical punches 3A and 3B and the support shafts 2A and 2B are set at a predetermined distance, the distance between the Shimosaka dies 5A and 58 is set, and the metal plate 12 to be processed is placed between the upper and lower mold bodies. The diamond will be placed in the position of . Next, the divided punches 3A and 38 with the end protrusions of the punch 3 were brought into contact with the surface of the plate 12 at the same level, and the cylinder mechanism 4 (Fig. IA) was operated in the downward direction, and at the same time it was fixed in a predetermined position. A support frame 16A is placed around the support shaft 16,
Activate the cylinder mechanisms 7A and 7B, and attach the shaft 1 to the support plate 9.
7A and 17B, connect one end of the cylinder mechanism to the shaft 17.
A and 17B are iron-coupled and rotatably moved, and the shaft 1 is attached to the support plate 15A with the end of the cylinder mechanism held by the shaft 15.
5 and rotates freely. metal plate 12
is pressed between the lower mold plates 5A and 58 and the split punches 3A and 3B with protrusions of the punch 3, and both ends of the metal plate are bent as shown in FIG. 3B, and finally, 3rd C
The workpiece metal plate 1 is moved to the position shown in the figure, that is, the vertical position where the surfaces of the divided lower templates 5A and 5B are parallel to each other.
The center lower end of 3 shows the original shape, the part that contacts the punch 3 is the same as the circumference of the punch, and both ends are split lower plate type 5A.
and 5B, and the bending angle of the workpiece plate is 90 degrees. This shape is different from "split punch 3A and 3" for a certain board.
B, the space 20 on the sliding surface in Figure 3A
The dimensional ratio between the rising part and the horizontal part changes depending on the size of the interval. Next, regarding other embodiments, FIG. 4A,
FIG. 4B, FIG. 4C, FIG. 4D, and FIG. 5A will be explained.

In FIG. 4A, as in the case of FIG. 3C, in this case, the rising dimension of the end IE of the curved plate is small, but the distance al between the support shafts 2A and 2B is reduced to a2. The split punches 3A and 3B with protrusions No. 3 are moved inward, and at the same time, the split downward slope molds 5A and 58 are moved so as to reduce the interval between the support plates from bl to b2. Next, split punches 3A and 3
B, shafts 2A and 2B, and divided downward slope molds 5A and 5B are actuated and moved as shown in FIG. 4C to bend the lower straight portion 13 of the workpiece plate, The bent plate end IE is shaped to such an extent that it approaches or supports the axis 2. Next, move the upper mold body including the punch 3 and shaft 2 to the rest position, and divide the molded body into the lower plate molds 5A and 5 as shown in Fig. 4D.
A weight 23 is applied from above and outside while being held between the lower mold body 6 equipped with the B and the both end plate surfaces are brought into contact, and tack welding is performed to tack weld the corresponding end plates at a predetermined interval. Part 22
The pipe is moved, set in a predetermined position, and tack welded to form a semi-finished pipe. As shown in FIG. 5A, as the next step, the temporary welding surface is completely welded in a regular manner to finish the pipe as a finished product. Since it is equipped with a structure in which the interval between the divided downward slope molds 5A and 58 can be changed to an arbitrary dimension, and the interval between the divided punches 3A and 38 can also be changed to a fixed dimension arbitrarily selected, the same pair of symmetrical By using the dividing punches 3A and 38, the above-mentioned spacing dimensions can be finely changed and applied to the manufacture of tubes having diameters within a certain range.

In order to give the welded pipe a perfect circular shape, each of a pair of upper mold OA and lower mold OB has a semicircular mold surface, and a pair of iron plates are stacked one on top of the other, as shown in Fig. 5B. It is corrected into a perfect circle in a mold with a circular mold surface.

It has been confirmed that this correction can be carried out sufficiently by incorporating the currently commonly used rectangular circular mold, and that it is possible to correct a perfect circle and straightness. In addition, in the present invention, when molding the upper mold body and the lower mold body in close proximity to each other, the punch 3 is arranged symmetrically between 3A and 3B having semicircular protrusions, whereas the conventional method uses a one-piece punch. divided into two bodies and a semicircular body 3A.
and 38 are separated from each other at a certain interval selected arbitrarily, and the interval between the lower body parts is also arbitrarily separated, and the processed metal plates placed in the bag are brought close to each other so as to first bend the ends, leaving a straight part, and then Then, the punch 3 is brought close to the straight part, the surfaces are brought together, and the lower mold body with the downward sloping mold is set at a predetermined interval, and the cylinder mechanism is activated to perform circular bending between the two mold bodies, at least the end bending and the circular bending. Bending U and O in two forming steps, abutting the end faces of the newly bent pipe, and tack welding without adding a joint unless it is particularly necessary. This can be done by holding it between lower mold plates.

According to the present invention, an exemplary flow sheet of the pipe manufacturing process is as shown in Table 1. Table 1: An Example of the Pipe Making Process of the Present Invention (c) Referring to FIG. 28, forming load calculation when the present invention is applied will be explained.

Let M be the moment required for bending the plate. The distance a between both semicircular punch protrusions 3A and 38 of the punch 3 provided on the upper mold body and the distance b between the two divided lower slope molds 5A and 5B provided on the lower mold body are made to be the same dimension. The end of the metal plate 13 to be bent is bent to an angle of 8, the plate thickness is t, the load on both plate ends is P, and the radius of the punch is r.
, the position where load PI is applied (plate end) and the bent end (lower template 5A)
, 5B end) is 14, and the silling mechanism 7A, 7
Let Q be the angle formed between the lower fixed shaft 17 and the upper fixed shaft 15 of B, which are vertically adjacent to the cylinder center line. The distances from the upper template support shaft 16 are 12 and 13, respectively. axis 16
The distance between the upper die plate end (bent end) and the upper mold plate end is 1. If the required load of the upper die cylinder mechanism required for bending is P, and the load required to push back the lower die plate 7A or 7B is R, Table 2 shows the results. Table 2: Determine the load P and the bending angle of the plate R, the position and height of the shafts 15 and 16, the oblique angle of the cylinder mechanism, the plate thickness, and the radius of the punch semicircle, and obtain the calculated values of the loads P and R. It will be done.

As already explained, the present invention relating to the manufacture of metal tubes involves bending and forming a group of plates (metal plates to be processed) in a predetermined shape between an upper mold body and a lower mold body, then temporarily welding the end faces, and then Welded to
Next, apply pressure inside a rectangular mold to correct the roundness and straightness. A calculation formula was obtained for the moment and load necessary for designing the layering for pipe manufacturing work of the present invention.

It was also confirmed that hot-rolled roll sheets can be formed without any special anchoring process. Also, the cylinder mechanism uses fluid, but it is convenient to use a liquid such as a hydraulic type.
In tack welding, a complete welded pipe can be obtained by lightly pressing the support surface (plate end) to set the rear angle to 0 degrees, tack welding, and then performing main welding.

The welded tube thus manufactured can be easily straightened into a perfectly round and straight tube by inserting it into a rectangular shape and pressing it.
The upper mold body is divided into left and right symmetrical parts with punches attached to it having semicircular protrusions, and the two punches are arranged at a fixed interval selected arbitrarily or in close contact, and combined with the operation of the lower mold plate. hand,
Since it can be molded, a pair of split punches and a
A lower die body with a pair of split downward sloping dies can be universally applied to the production of pipes with diameters in a considerable range of sizes.

The present invention significantly improves the workability in manufacturing metal welded pipes from metal sheets, and significantly improves the manufacturing efficiency from metal sheets, as compared to conventional methods.

[Brief explanation of drawings]

FIG. IA is a side view of one embodiment of the invention. Figure IB is a front view of the same. Figure 2A is a plan layout. FIG. 28 is a front view showing the relationship between load and moment. FIG. 3A, FIG. 3B, and FIG. 3C are illustrations of end bending. FIG. 4A, FIG. 4B, FIG. 4C, and FIG. 40 are illustrative front sectional views from molding to tacking. FIG. 5A is a sectional view of the welded pipe. FIG. 5B is a front sectional view showing an example of perfect circular correction. 1... Upper body, 2, 2A,
2B...Support shaft, 3, 3A, 3B...
Semicircular punch, 01...plywood, IB...board edge,
01A, 01B...Inside pipe, 5,5A,5B...Lower template,
15, 16, 17, 17A, 178...axis, IA,
IB, 4, 7, 7A, 7B...Cylinder mechanism, t, a
l, a2, bl, b2, 1,, 12, 13, 14...
...Dimensions, 13, 14... Processed metal plate.多′＾弾多′B 函耆ZA 图多ZB 击郎 3＾四麗】B9 倆（ Spotted # ＾ fig inferior 〆 6 box C

Claims (1)

[Claims] 1. For manufacturing a perfectly round cross-section welded pipe from a metal plate using a pair of forming mold bodies consisting of an upper mold body equipped with a punch 3, a lower mold body equipped with a lower plate mold 5, and their operating mechanism, The upper die body has a semicircular cross section and a vertically elongated body surface protrusion.The punch 3 is symmetrical and is divided into two parts at symmetrical positions.A pair of divided punches 3A and 3B and the punch shafts 2A and 2B are interlocked with each other. The lower mold body has a flat surface with an inclined angular surface as the lower plate mold 5, and is divided into two symmetrical parts at mutually symmetrical locations, and is divided into a pair of interlocking divisions. Lower plate type 5
It consists of A and 5B and an actuating cylinder mechanism attached to the lower plate mold shaft, and moves the punch 3 attached to the upper mold body up and down with respect to the charged metal plate between the upper mold body and the lower mold body. Split punch 3A
and 3B, bend the remaining plate end 1E to approximately 180 degrees to form a tube with the formed end surfaces in contact, and when forming the tube, place the above-mentioned plate at a position suitable for the forming process. The upper mold body and the lower mold body are used to move the pair of split punches 3A and 3B of the upper mold body and the divided lower plate molds 5A and 5B of the lower mold body by moving the left and right distances closer together, in close contact with each other, separating them, or raising and lowering them. A pipe manufacturing process in which a rotatable operating cylinder mechanism is provided around the mounting axis of the mold body, and the welded pipe body obtained by welding the forming pipe bodies is finally formed into a perfect circular pipe. A metal welded pipe manufacturing device characterized by being equipped with a finishing device.