JPH0366416A - Manufacture of square tapered steel pipe for connecting steel frame and press device for namufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a square type tapered steel pipe by preparing a steel sheet having both end edges at the position about corresponding to the center line of one face of a steel pipe, preparing a semi-product by pressing and folding at the position equivalent to each corner part, taking it out in the length direction of a press die and welding both end edges of the steel sheet. CONSTITUTION:A steel sheet 1 is positioned by placing it on a lower die 7 and a corner part L1 is subjected to press forming in the space with the lower die 7 with the descent of a press die 5 by descending a lift frame 9. A semi- product 6 is obtained by repeating the press formings of each corner parts L2, L3, L4. The press die 5 is ascended by lifting the lift frame 9, a hydraulic cylinder 12 is operated and the press die 5 is translated to a downward inclined posture by rotating it around a horizontal support shaft 10. A square part 5d is thus drawn out of a bearing groove 11, one end side of the press die 5 is released and the semi-product 6 is taken off to the external part with its gravity. On this semi-product both end edges 2, 3 of the steel sheet are joined by welding to make a square tapered steel pipe.

Description

[Detailed Description of the Invention] [Industrial Application Field] Tomoe's invention relates to a method for manufacturing square tapered steel pipes that are used to connect upper and lower square steel pipes in steel-frame buildings that use square steel pipes as columns. This invention relates to a manufacturing press device.

[Conventional technology]

In steel-framed buildings where square steel pipes are used as columns, steel pipes with smaller cross-sectional dimensions are used on the upper floors or upper floors. A rectangular tapered steel pipe C having an end cross-sectional dimension of J% is used. As indicated by the chain lines in Figure 14, upper plates A are attached to the upper and lower ends of the tapered steel pipe C to connect the beams, etc.
A lower plate B may also be attached.

As the rectangular tapered steel pipe for this purpose, the VC type 3 type 0 shape as illustrated in Figs.
As shown in Fig. 5, the four-sided S1+s is used by attaching the button to the pillar placed in the center of the building, and SB*S4 is a tapered steel pipe with a tapered surface, as shown in Fig. 15. Three-sided St, Ss-Si used as a button on the pillar of
t'' tapered surface ε, and the remaining surface S is a vertical tapered steel pipe, and the two surfaces S, S, used for columns and l- placed at the four corners of the building as illustrated in Fig. 16. The remaining two surfaces S, , S are tapered surfaces.

There is a tapered steel pipe whose vertical plane is .

One of the conventional methods for manufacturing such a rectangular tapered steel pipe is a method using a rectangular steel pipe as a starting material. That is, a rectangular steel pipe cut to a predetermined length is, for example,
The outer mold and the inner mold were used to press sand on all four sides and processed as disclosed in Fig. 1 of Publication No. 5027.
A tapered steel pipe with a four-sided taper as shown in the figure is manufactured.

In the same way, the three-sided taper shown in Fig. 16 and the first
If an attempt is made to manufacture a double-sided tapered steel pipe as shown in FIG. 7, since these tapered steel pipes are of non-uniform shape, stress will be concentrated in specific parts, making it impossible to obtain a satisfactory product. Therefore, the method disclosed in the above-mentioned Japanese Patent Application Laid-open No. 63-295027 is to manufacture a tapered steel pipe with a four-sided taper as shown in FIG. A 3-sided tapered steel pipe or a 2-sided tapered steel pipe is manufactured by cutting off the steel pipe so that a 3-sided tapered steel pipe as shown in the figure or a 4-sided tapered steel pipe as shown in FIG. 17 is obtained.

Another conventional method for manufacturing a rectangular tapered steel pipe is to press-form the halves C, C, of a rectangular tapered steel pipe from two steel plates cut into a predetermined shape, as shown in Fig. 18. The two halves 6 and C are welded together.

[Problems that the invention attempts to solve]

The conventional manufacturing method for rectangular tapered steel pipes using rectangular steel pipes as a starting material uses rectangular steel pipes, which are more expensive than steel plates, as a raw material, and prepares large molds for each tapered steel pipe of different dimensions. The cost is high because it has to be done. In particular, in order to manufacture a tapered steel pipe with a tear-out on three sides or a taper on two sides, it is necessary to first manufacture a tapered steel pipe with a four-sided taper and then lower the upper and lower ends by 9 Jυ, as in the above-mentioned Japanese Patent Application Publication No. 63-295027. If this method is adopted, it will require a large amount of cost due to increased machining failures and wasted material, and will also result in dimensional differences between the four cutting surfaces and problems in connecting with square steel pipes. .

On the other hand, in the conventional method shown in Fig. 18, although the material cost is low, the welding process costs are high because there are two welding locations, and there are still problems with strength due to the two welding locations. ing.

Therefore, this invention provides a new manufacturing method for rectangular tapered steel pipes for connecting steel frames, which solves the above-mentioned problems by using steel plates as the starting material and welding at one location, and a press suitable for use in the manufacturing method. The aim is to provide the equipment.

[Means for solving problems]

In order to manufacture a rectangular tapered steel pipe with less than ε and two tapered faces, the present invention uses a steel plate IA having a shape in which a rectangular tapered steel pipe is developed as illustrated in FIGS. 2(a) to (C).
. IB, IC'i, etc. are produced by cutting from a large-sized steel plate, and these are used as starting materials. The steel plate IA shown in FIG. 2 (al) is applied to the four-sided tapered steel pipe shown in FIG. 15, the steel plate IB shown in FIG. 2(b) is applied to the three-sided tapered steel pipe shown in FIG. 16, and The steel plate IC shown in FIG. 2 (cl K corresponds to the double-sided tapered steel pipe shown in FIG. Each steel plate IA shown in FIGS.

Both edges 2°3 of IB and IC are 1st 15°16.
It is located at a position corresponding to the center line X of the surface S of the tapered steel pipe shown in FIG.

Next, as illustrated in FIGS. 3(a) to 3(d), the present invention uses a press die 5 to press a steel plate 1 having a shape as shown in any of FIGS. 2(a) to (C). From one side, the positions corresponding to each corner of the rectangular tapered steel pipe, I t,, @
A semi-finished product 6 is obtained by sequentially pressing and bending the steel plates at both ends 2 and 31P as shown in FIG. 3(d).
Create.

When this pressing process is completed, the press die 5 is left inside the semi-finished product 6 which is closed with four parts. One end side is opened and the semi-finished product 6 is taken out along the length direction of the press mold 5.

Next, as illustrated in FIGS. 5(a) and 5(b), the semi-finished product 6 is joined by Ik welding at both ends of the steel plates to obtain the desired product.

As illustrated in FIGS. 1 and 6-13, the press device according to the present invention has a press die 5 for pressing and bending a steel plate at right angles between a lower die 7 and a press die 5 at one end in the longitudinal direction. A holder 8 is provided to hold the press die 5 through the holder 8 on one leg 9a end of the gate-shaped lifting frame 9 which is driven up and down by Lb by fluid pressure, and the other end of the press die is lowered from a horizontal position. The other leg portion of the gate-shaped elevator frame 9 is supported rotatably by horizontal support shafts 10-1 and 10-1, and the other end of the press die 5 in the length direction is formed into a square portion 5d. At the end of 9b, press mold 5
is in a horizontal position! A support groove 11 with an open lower end is provided to support the rectangular portion 5d and restrain the press mold 5 so that it cannot be rotated, and the press mold 5 A hydraulic cylinder 1.2 is provided for rotationally displacing the cylinder.

The present invention further includes a press die 5'f: four forming die parts F formed in a rectangular shape and having different radii of curvature R+ -Rs-Rs-R4 in the press die 5'f.
,,F,. Fs and F are set with the Japanese food phase shifted by 90 degrees,
A round part 5a and a square part 5b are provided at the one end of this press die 5.
The press die 5 is rotatably supported by a holder 8 at the round part 5a, and the square part 5b is supported by the holder 8 to restrain the press die 5 so as not to be rotationally displaceable. A holding frame 15 having a support groove 14 with its lower end open is provided with an upwardly movable fc so that the support groove 4 can be removed from the square portion 5b.

[For production]

To perform a press forming process on a steel plate using the press apparatus according to the present invention, set the elevating frame 9 in the raised position and raise the press die 5 as shown in FIG. 3(a). Similarly, after positioning the steel plate 1 by drawing it on the lower die 7 as shown by the chain line in the same figure, the elevating frame 9 is lowered. The mold 5 is lowered by a predetermined stroke as shown by the arrow, and one corner Ll is press-molded between the lower molds 7. Thereafter, in sequence, the press mold 5 is raised by raising the lifting frame 9, the Os is positioned on the lower mold 2 of the steel plate 1, and each corner is electrically charged by lowering the press mold 50*L@-L
4 is repeated to obtain the semi-finished product 6 shown in FIG. 3 (cl).

Here, the lifting frame 9 is raised and the press mold 5 is moved to the raised position, and then the fluid pressure cylinder 12 is operated, and the press mold 5 is rotated together with the holder 8 by the horizontal support shaft 10-1b, as shown in FIG. Move to the downward tilt position shown in the figure. As a result, the square part 5d of the press die 5 is pulled out from the support groove 11 at the end of the other leg 9b of the gate-shaped lifting frame 9, and one end side of the press die 5 is opened. It slides out of the press die 5 under its own weight and is taken out of the press device.

Since the middle press mold 5tc has been moved to the raised position, the lower mold 7 does not get in the way when the press mold 5 is tilted downward and the semi-finished product 6 is taken out as shown in FIG.

Next, the fluid pressure cylinder 12 is operated in the opposite direction to press the press mold 5.
is rotated upward by the horizontal support shaft lO housing D, and the square part 5d is supported in the support groove 11tlc to obtain the horizontal posture of the press mold 5,
The next step is to press the steel plate.

As mentioned above, the press die 5 has a radius of curvature R, , R, , R, S.
Four mold parts F@*F1 with different R, (Fig. 12)
mF1. The reason for using F is that since the radius of curvature of the edge part changes depending on the wall thickness of the product, it is possible to use a single press die 5 to handle four types of square tapered steel pipes with different radii of curvature. In order to change the mold part used in the above-mentioned structure, Ic is to make the press ff15 take a downwardly inclined position using the fluid pressure cylinder 12 as shown in FIG. 5d'i Remove the other leg 9b end of the gate-shaped lifting frame 9 from the support groove 11, and move the holding frame 15 (Fig. 1.7.10) upward.
As a result, the support groove 14 at the lower end of the frame 15 is removed from the other square portion 5b of the press mold 5. In addition, since the press mold 5 can be rotated in the holder 8 by its round part 5a, the mold part Fl to be used next.

For Ft and FJ, manually index and rotate the press die 5 so that F4 faces the lower die 7, and then attach the holding frame 1.
Lower the s to its original position and attach the p square part 5111 to the support @14.
The press die 5 is supported so that it cannot be rotated. Then, the press die 5 is rotated upward by the fluid pressure cylinder 12 so that the other end side O-gonal part 5d is supported in the support groove 11, and the press die 5 is rotated upward.
Obtain a horizontal position and begin the pressing process.

〔Example〕

FIG. 6 schematically shows the entire press machine.
It is equipped with a large fluid pressure cylinder 20 for raising and lowering the gate-shaped lifting frame 9 as described above. While the thickness of the raw steel plate to be pressed and bent at right angles is in the range of 15-35M, the pressing pressure by the fluid pressure cylinder 20 is set to about 1000 tons.

The specific structure of the press device of Example O will be explained with reference to FIG. 1 and FIGS. 7-13. As shown in FIG. It has a mold part Fs-Fa.

The radii of curvature R, , R1, R1, and R4 shown in FIG. 12 are, for example, 49 ms, 54 ms, 60 ms, and 68 radii.

As shown in FIG. 8, the press die 5 made of a suitable material such as high-strength steel has the above-described round part 5a and square part 5b at one end, and a small-diameter round part 5C following them. t″L, and the other end is formed in the square portion 5d.

As shown in Fig. 1 and Fig. 7.10.11, a small supporting leg 22 is protruded from the lower end of one leg 9a of the gate-shaped lifting frame 9 and supports the round part 5a of the first press die 5. The support leg 22 is inserted into the upper end fork part of the main body part 8a of the holder 8, which has a circular support hole 23, and the horizontal support shaft 10 is inserted so as to straddle the fork part and the support leg 22. The holder 8 is rotatably supported on the monopod 9a. One leg portion 9aK of the gate-shaped lifting frame 9 on both sides of the upper end of the supporting leg 22 is flush with the arcuate surface 24! A horizontal surface 25 following L is formed, and a corresponding arcuate surface 26 and horizontal surface 27 are formed at the upper end of the fork portion of the holder main body portion 8a, and the press lI5 is moved between the horizontal position shown in FIG. 7 and the inclined position shown in FIG. When rotating to ', the arc surfaces 24°26 guide each other,
In the horizontal position shown in FIG. 7, the horizontal surfaces 25 and 27 are in close contact with each other, so that substantially no press pressure is applied to the horizontal support shaft 10 during press forming when the press die 5 is held in the same horizontal position.

As shown in FIG. 1 and FIG. 7.10, the holding frame 1-4 has a horizontal part provided with the inverted V-shaped support groove 14 at the lower end, and a holder main body part 8a rising from the end of the horizontal part. The outer end surface of the 7-oct part VC? It has a fork-shaped vertical plate part that is curved. Four elongated holes 29 are formed in the vertical plate part along the vertical direction, and a pole (30 g) is screwed onto the fork part of the holder body part 8a through these elongated holes 29'.
Then, loosen the bolt 30 by 15 minutes so that the bolt 30 is located at the upper end of the elongated hole 29 as shown in FIG. By lifting the holding frame 15 and moving the holding frame 15 upward until the bolt 30 is located at the lower end within the elongated hole 29, the support groove 14 can be removed from the square portion 5b of the press mold 5.

The support groove 11 supports the square portion 5d at the other end of the press die 5
As shown in FIG. 13, this is shown in the inverted V-shaped support hardware 32 that fits into the inverted V-shaped groove formed at the end of the other leg 9b of the gate-shaped lifting frame 9 and is attached to the end of the other leg 9b. To do this, insert the sleeve 34 and insert a pair of bottles 35 into the sleeve 134.
is installed.

The fluid pressure cylinder 12 is connected to a bracket 36 attached to the outer surface of one leg 9a of the gate-shaped lifting frame 9, and the end of the cylinder body is attached to the bin 3.
7, and a U-shaped connecting fitting 38 is attached to the end of the piston rod. The piston rod is connected to the sleeve 34 so as to be rotatable relative to the sleeve 34 by attaching a tube 38a that fits over the pin 35 on the sleeve 34 to the end of the connecting hardware 3B. A plate 39 for preventing the sleeve 134 from coming off is attached to the outer end surface of the round portion 5C.

The lower mold 7 is arranged so as to face below the press mold 5, and is connected to a pair of rollers provided with an appropriate interval.

The press apparatus described above is used as described above in the section of operation. When the press mold 5 is raised to the position shown by the chain line after the first press forming shown in FIG. It slides on the lower mold 7 due to its own weight and stands on the lower mold 7 with its long side horizontal as shown in FIG. Therefore, as shown by the chain line in FIG. 4, the bushing plate 40a9
[By pushing the end of the steel plate 1 using the hydraulic cylinder 40, etc., the steel plate 1 can be brought to a predetermined position below the press die 5, where it should be pressed next. In order to make the movement of the steel plate 1 smooth, lCf1. A guide roller similar to the lower die 7VC may be provided. After the pressing process shown in Fig. 3(b), w, Fig. 3(
C) movement of the steel plate 1 before proceeding to the pressing process, and the third
The movement of the steel plate 1 before proceeding to the pressing step of FIG. 3(d) after the pressing step of FIG. 3(C) can also be performed in the same manner.

The welding process of the edge 2.3 of the semi-finished product 6 shown in FIG. figure(
The outer surface welding shown in b) is performed to complete the product.

〔Effect of the invention〕

The method for manufacturing a rectangular tapered steel pipe for connecting steel frames according to the present invention uses a rectangular steel pipe υ and a low-friction steel plate as starting materials, and a three-sided tapered steel pipe as shown in FIG.
A two-sided taper as shown in Fig. 7 can also be manufactured by simply imparting the developed shape to a steel plate, and a four-sided taper as shown in the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 63-295027 mentioned above can also be manufactured. Since there is no waste of material such as sanding down the upper and lower ends of objects, material costs can be kept low.

In addition, since the shape of a rectangular tapered steel pipe is obtained by pressing a steel plate, the inner and outer molds with complex shapes and large dimensions are used to obtain the shape of a rectangular tapered steel pipe by drawing a square steel pipe on four sides. ! 4, it is sufficient to use a press die with an extremely simple shape, and rectangular tapered steel pipes with different external dimensions can also be press-formed using a single press die.
Compared to the conventional method shown in Figure 8 and described above, only one welding process is required! ! The song is reduced and the separated half one
1sc1. When performing the first welding on C, precise positioning between the two halves C, C, is required, but it is sufficient to weld only on the abutted steel plate edges 2.3. Therefore, processing costs are also low.

Therefore, by using the manufacturing method of the present invention, rectangular tapered steel pipes for connecting steel frames can be manufactured at a much lower cost than in the conventional method.

! ll! Looking at the product, compared to the product made by the conventional method shown in Fig. 18, there are only 1lii welded parts, which, combined with the fact that the welded part is located approximately at the center line of one side of the tapered steel pipe, is satisfactory. Welding provides strength, and compared to products obtained by drawing or processing square steel pipes, considering the stress concentration that inevitably occurs when drawing square steel pipes, which are not completely symmetrical unlike circular steel pipes. Even though it has some parts, it is possible to obtain a product with comparable strength. In particular, for three-sided tapered and two-sided tapered steel pipes, the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 63-295027 causes dimensional differences in the cut end faces, causing problems in connection with square steel pipes. According to the manufacturing method of the present invention, dimensionally accurate products are obtained.

Next, in the press apparatus t for manufacturing a rectangular tapered steel pipe according to the present invention, the press die 5 is placed on the end of one leg 9a of the gate-shaped lifting frame 9 through the holder 81 at one end in the length direction. The other leg part 9b of the gate-shaped lifting frame 9 is rotatably supported by the horizontal support shaft 10 in a tilted position with the other end @ lowered.
Support with the lower end open @IIK Press mold 5 so that the square part 5d of the other end is the
By tilting the fluid pressure cylinder 12,
Since the semi-finished product with the four sides closed can be taken out as it is from the side end of the press mold, how can the semi-finished product with the closed shape and the press W left inside it be separated? The problem of taking out a semi-finished product at a distance 27≧ is solved by a structure that also ensures ease of taking out the semi-finished product by sliding it on the inclined press die 5, and making it possible to take out the semi-finished product from a single steel plate. This enables a series of pressing steps up to the shape, and is extremely suitable for carrying out the manufacturing method of the present invention.

It is OK to open one end side of the inner press mold 5 to take out the semi-finished product, and the other leg part 9b of the gate-shaped lifting frame 9 is provided with an elevating part or a rotating part, and the same part is released from the press mold 5. Although it is possible to consider a structure in which the other leg portion 9 is subjected to high press pressure,
Providing the above-mentioned movable part on b causes a problem in terms of the strength of the device, whereas the press type square part 5d at the end of the other leg part 9b
The device of the present invention is provided with a support groove 117 for holding the gate-shaped lifting frame 9 from the upper side, from the other leg 9b2 of the gate-shaped lifting frame 9 to its f, and the end of the press machine! By applying press pressure to l5 (5d), there is no problem in terms of the strength of the device.

According to the device structure described in lff requirement 3, as mentioned above, four types of rectangular tapered steel pipes with different radii of curvature at the corners depending on the steel plate thickness can be manufactured using a single press mold 5. The effect of reducing manufacturing costs is enhanced.

[Brief explanation of drawings]

Figure 1 shows part 5 of the press apparatus of the present invention! A front view showing the main part of the example with the press m in an inclined position, FIG. 2(a)
, (b) and (c) are respectively plan views illustrating a steel plate in the developed shape of a rectangular tapered steel pipe used as the starting material for the manufacturing method of the present invention, and FIGS. 3(a), (b),
(c) and (d) are side views sequentially illustrating the pressing steps applied to the manufacturing method of the present invention, FIG. 4 is a side view illustrating the intermediate state or example of the same pressing step, and FIGS. ) are perspective views sequentially illustrating the welding process applied to the manufacturing method of the present invention,
Fig. 6 is a schematic front view of a press machine equipped with one embodiment of the above-mentioned press device, Fig. 7 is a front view of the above-mentioned embodiment, and Fig. 8 is a perspective view showing the press ffi applied to the same projecting embodiment. Figure 9, Figure 1O, Figure 11, Figure 12 and Figure 1
Figure 3 is the ■-■ line in Figure 7, respectively. X-X61. X[-XI line, summer-m line and XIII-X
14 is a cross-sectional view taken along the IH line, FIG. 14 is a perspective view showing how to use square tapered steel pipes for connecting steel frames, and FIGS. 15 (a) and (b)
) and (C) are respectively a plan view, @ side view and front view showing an example of a rectangular tapered steel pipe with a four-sided taper, and Fig. 16(a)
, (b) and (C) are a top view, a side view, and a front view showing an example of a rectangular tapered steel pipe with a three-sided taper, No. 17
Figure (a). (b) and (C) are respectively a plan view, an a-side view, and a front view showing an example of a rectangular tapered steel pipe with a two-sided taper, and FIG. 18 is a perspective view showing an example of a conventional manufacturing method. 1.IA. 1B, IC... Steel plate, 2.3... Steel plate edge, 5... Press mold, 5a... Round part, 5b...
・Square part, 5c... Round part, 5d... Square part, 6.
... Semi-finished product, 7... Lower mold, 8... Holder 8a.
・・Holder main body part % 9 ・Gate-shaped lifting frame, 9a ・・
- Leg part, 9b...Other leg part, 10...Horizontal support shaft, 11
...Support groove, 12...Fluid pressure cylinder, 14...
Supporting groove, 15... Holding 7 frame, 20... Large fluid pressure cylinder, 29... Long hole, 30... Bolt, 32
...Supporting hardware, 34...Sleeve, 35...Bin, 37...Bin, 38...Connecting hardware. (C) Figure

Claims (1)

[Claims] 1. A method for manufacturing a rectangular tapered steel pipe for connecting steel frames having at least two tapered surfaces, the steel plate having the shape of an expanded rectangular tapered steel pipe, the center line of one surface of the steel pipe being A steel plate with both edges in approximately corresponding positions is manufactured, and this steel plate is sequentially pressed and bent from one side of the steel plate at positions corresponding to each corner of a rectangular tapered steel pipe to form a half with both edges of the steel plate abutted against each other. A manufacturing method in which a product is manufactured, one end of a press die in the length direction is opened, the semi-finished product is taken out along the length of the press die, and both edges of the steel plate of the semi-finished product are joined by welding. 2. A monopod of a gate-shaped lifting frame that is driven up and down by fluid pressure is provided with a holder that holds the press mold at one end in the length direction for pressing the steel plate and bending it at right angles between the lower mold and the lower mold. The press mold is supported via the holder at one end so that it can rotate around a horizontal support shaft from a horizontal position to an inclined position with the other end of the press mold lowered, while the other end in the length direction of the press mold is supported. A support groove formed in a square part and opened at the lower end of the other leg of the gate-shaped lifting frame is provided to support the square part and restrain the press mold against rotational displacement when the press mold is in a horizontal position; A press device for manufacturing rectangular tapered steel pipes for connecting steel frames, characterized in that a fluid pressure cylinder for rotationally displacing a press die is provided between the above-mentioned holder and one leg of the gate-type lifting frame. 3. In the press apparatus according to claim 2, the press mold is formed into a rectangular shape, and four mold parts having different radii of curvature are provided on the press mold with a phase difference of 90 degrees. A round part and a square part are formed at the one end, and the round part supports the press die in a rotationally displaceable manner on the holder, and the square part is supported on the holder so that the press die cannot be rotationally displaced. A press device characterized in that a holding frame is provided with a support groove with an open bottom end for restraining the press, and is movable upwardly so that the support groove can be removed from the square portion.