JPS6254523A - Forming equipment for pipe stock for angular steel pipe - Google Patents

Abstract

PURPOSE:To simplify the structure and to miniaturize driving device by advancing the press frame of each press machine to support the upper die and lower die with a driving device and by press-forming by pushing up the lower die as well. CONSTITUTION:A hoop 1 is fed into the opening between the upper die 18 and lower die 19 of the press machine 11 bending the upper side corner and a press frame 17 is advanced by actuating a cylinder 30 at synchronous speed. The right and left both side parts are bent by actuating a press cylinder 23, by ascending the lower die holder 21 along the right and left side frames 16 and by pressing the hoop 1 with the lower die 19. A semi-forming material 1a is then made with the bend forming upto about 80 deg. by repeating successively the motion of returning to the original position. It is then fed to the upper die 36 and lower die 37 of the lower side corner bending press machine 13, a press frame 35 is advanced, the lower die holder 39 is ascended along the right and left side frames 34 and the material 1a is bent by pressing it with the lower side 37. An angular steel pipe 1b is made by bending the right and left both sides of the center part upto about 80 deg. by repeating this motion.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a forming apparatus for rectangular steel pipes, and particularly relates to
The present invention relates to a forming apparatus suitable for forming a large rectangular steel pipe having a square or rectangular cross section with a side length of 550 mm or less, each corner of which is bent at approximately 80 degrees, and a cross section between the tools.

(Prior art and its problems) In recent years, earthquake-resistant design has been adopted in the structural design of building structures, and large square steel pipes have come to be frequently used as pillar materials in buildings.

Generally, square steel pipes with a plate thickness of 6 meters or more and a side length of 200 meters or more are called large square steel tubes, among which the plate thickness is 16 meters or more.
Large square steel pipes with a side length of over 400 m are manufactured using the following method.

(1) Use the entire cutting board of finite length as the material, bend one side of the cutting board 101 at right angles with a V-shaped press 102 as shown in Fig. 9 α, and then cut as shown in Fig. 9. The other end of the plate 101 is bent at right angles with a V-type press 102 to form a channel steel 103, and then the two channel steels 103 are placed opposite each other left and right as shown in Figure C of $9, and both ends are bent, respectively. Butt, seam 1 of the top and bottom sides
04 is welded to produce a large square steel pipe 105.

(2) Using all cutting plates of finite length as the material, Figure 10 α to d
As shown in the figure, after bending the cut plate 101' at four corners of the square steel pipe one by one using the V-shaped press 102,
The corner angle gradually approaches 90 degrees through several passes of rolling to form a square shape, and both ends 106 of the cut plate 101' are butted together and welded by arc welding or the like to form a large square steel pipe 105'.
Manufacture.

By the way, in both of the above two manufacturing methods, a cut plate of finite length is used as the material, each corner is bent with a V-type press, and welding is performed in a separate process, so the work is intermittent, resulting in a long waiting time. This increases efficiency and increases the number of workers. In addition, the welding quality at the edges of the product is unstable, so it is necessary to attach a tab plate and weld, or to cut off the metal at the edges of the product, resulting in poor material yield. Furthermore, when the product after welding is passed through a shaping roll and a large forming pressure is applied for the purpose of adjusting the size of the corner R and side dimensions, the material slips due to deformation resistance, so the large pressure cannot be applied, and therefore The corner radius is where the RVC at the bottom of the V-type press mold resides, and the corner radius cannot be selected freely.Q In order to solve this problem, the inventors of the present invention have continuously and efficiently manufactured square steel pipes. In addition, it is possible to produce square steel pipes with good welding quality and high dimensional accuracy.Furthermore, it is possible to produce square steel pipes by arbitrarily adjusting the flatness of one side, the size of corner radius, etc., and the material yield is low. Developed a method for manufacturing good square steel pipes. (t￥f request number 59-260346)
The outline of the manufacturing method of this square steel pipe will be explained using the manufacturing line shown in Fig. 11.
1, after the curling curl has been corrected by the uncoiler 202, the tip is connected to the rear end of the leading steel strip and the shear welder 2.
It is @-connected by 05. Connected steel strip 2
01fl-11, pinch roll 206. Hang table 207. After the feed is adjusted by the pinch rolls 208, it enters a beveling machine 209, where both left and right ends are finished into a predetermined bevel shape with a required width. The steel strip 201 that has exited the beveling machine 209 is as follows.

The material is continuously fed into the upper corner bending press 211 at a constant speed by the feed roll 210, and the left and right sides of the flat plate are sequentially bent to a bending angle of approximately 80° to form a semi-formed material 201a. The semi-formed material 201 (L) that has come out of the press machine 211 (the upper corner forming roll 21
At step 2, the shape of the upper side is adjusted, and at the same time, a feeding force is applied to the lower side corner bending press 213.

The left and right sides of the central part of the semi-formed material 201α are sequentially bent upward from a flat plate to a bending angle of approximately 80 degrees. In this way, the four corners of the original steel strip 201 are formed to approximately 800 mm, resulting in a rectangular steel pipe 2016. This square steel pipe bed f201b is sent to the forming rolls 214 for several passes, and after each corner is formed to approximately 90°, it is sent to the welding butt rolls 215, and the parallelism of the butt ends and the root gap are adjusted. . and welding machine 216
The butt ends are welded continuously. At this time, if necessary, a back metal (not shown) is held in the pipe to prevent the molten metal from dripping. The square steel pipe 201c whose butt ends are welded is the support roll 2.
After passing through step 17, the welding excess portion on the upper surface is removed by an outer surface bead removal device f218, and the upper surface is made smooth.

This rectangular steel "W 201c" whose top surface has been smoothed enters a two-bath standard roll 219, and after the outer dimensions and corner R are finished to specified dimensions, it is transferred to a two-bath straightening roll 220.
The bend 2 warp is corrected. Then, this straightened square steel pipe 201c is cut into a fixed length by a cutting machine 221 between runs to become a product P, which passes through a full-out roll 222 and is sent out at a run-out table 223.

By the way, the upper corner bending press machine 211id,
The steel strip 201 is continuously fed at a constant speed into the open state of the upper mold 229 and lower mold 230 shown in FIG.
4, 235 are operated at a speed synchronized with the feeding speed of the steel strip 201, and the upper die 229 is integrated with the upper die holder 231.
The lower die 230 integrated with the lower die holder 236 is advanced, and at the same time, the press cylinder 241 is actuated, and the holder receiver 238. Both the lower die holder 236 is raised along the left and right side frames 227, and the inner surface is zero in the longitudinal direction.
-m The left and right sides of the steel strip 201 are bent along the lower die 230 by pressing with a lower plate 230 that has a tapered surface 232 that stands up to approximately 80 degrees. The cylinder 241' is operated in the opposite direction to lower the holder receiver 238 and the lower mold holder 236 together, and the lower mold 230 is lowered to release the steel strip 201. At the same time, the cylinders 234 and 235 shown in FIG. operates to retract the upper mold 229 integrated with the upper mold holder 231 and the lower mold 230 integrated with the lower mold holder 236;
This allows it to return to its original position. Thereafter, the above-mentioned operation is continuously repeated to bend the left and right sides of the steel strip 201 passing through the upper corner bending press 211 upward at approximately 8061 degrees.

Moreover, the press machine 213 is the 13th corner curve of the lower side.
When the semi-molded material 201α is continuously fed at a constant speed into the open state of the upper mold 248 and the lower mold 249 shown in the figure and advances by a constant pitch, the cylinder 25 shown in FIG.
3.258' is operated at a speed synchronized with the feeding speed of the semi-molding material 201α to advance the upper mold 248 integrated with the upper mold holder 250 and the lower mold 249 integrated with the lower mold holder 255, and at the same time, the press cylinder 260 Activate the holder receiver 257. The lower mold holder 255 is raised along the left and right side frames 246, and is pressed with a lower mold 249 whose inner surface has a tapered surface 251 standing up from 0 to approximately 80 degrees in the longitudinal direction to form the semi-molded material 201z. Both left and right sides of the central part are collected in the lower mold 249 and bent, and when this bending is completed, the press cylinder 2 is immediately
60 in the opposite direction, the holder receiver 257. Lower mold holder 2
55 and lower the lower mold 249 to form the semi-molded material 2.
At the same time as releasing the cylinder 01α, the cylinders 253 and 258 shown in FIG. It is meant to bring you back. Thereafter, the above-mentioned operation is continuously repeated to form the lower corner by bending the left and right sides of the central part of the semi-formed material 201α passing through the press 213 upward to approximately 80°.

As described above, the upper side corner bending press machine 211 and the lower side corner bending press machine 213 operate the upper die 229 and the lower die 230 and the upper die 248 and the lower die 249 respectively during bending.
together, each cylinder 234.235 and 253.2
At the same time, the press cylinders 241 and 260 are operated to raise the lower molds 230 and 249 for press forming. Since it is necessary to overcome the frictional force of the pressing force of forming and move the upper and lower molds forward, an excessive load is applied and the steel strip 201
It is difficult to advance at a speed that is synchronized with the feed speed of the cylinder, and a large, high-capacity cylinder is required to advance at a synchronized speed.

(Purpose of the Invention) The present invention was made to solve the above problem, and instead of advancing the upper die and lower die of the upper corner bending press machine and the lower side corner bending press machine individually, the entire press machine is moved forward. The object of the present invention is to provide a forming device for a rectangular steel pipe that moves forward in synchronization with the feeding speed of the material to be formed and at the same time press-forms the material to be formed by pushing up a lower die. .

(Means for Solving the Problems) In order to solve the above problems, the square steel pipe blank forming apparatus of the present invention has a press frame having a rectangular cross section. The lower mold holder is supported so that its dimensions can be adjusted and is positioned using a distance piece, and press cylinders are erected on the lower frame at regular intervals in the longitudinal direction to support the lower mold holder in a vertically movable manner. A concave lower die, which is divided into left and right halves on the board holder and whose inner surface is a tapered surface that gradually rises from 0 to approximately 80 degrees in the longitudinal direction, is supported in a width-adjustable manner and positioned by a distance piece, The press frame consists of an upper corner bending press machine that is reciprocated by a drive device on a rail in the front and back direction, and a press frame with a rectangular cross section that is divided into two parts on the left and right from the front part to the middle part of the upper frame. The upper mold is supported in a width-adjustable manner and positioned using a distance piece, and the upper mold is detachably supported on the upper frame from the middle part to the rear part, and the lower end is set to have the same width as the upper mold. The lower frame has a narrow upper part, and press cylinders are installed vertically at regular intervals on the lower frame to support the lower mold holder in a vertically movable manner, and the lower mold holder is divided into two on the left and right. A concave lower die whose inner surface is a tapered surface that gradually rises from 0 to approximately 80 degrees in the longitudinal direction is supported in a width adjustable manner and positioned by a distance piece, and the press frame is mounted on rails in the front and back direction. It consists of a lower corner bending press whose upper part is reciprocated by a drive device.

(Embodiment) An embodiment of the square steel pipe forming apparatus of the present invention will be described with reference to FIGS. 1 to 5. The molding apparatus of the present invention has a first
As shown in the figure, there is an upper corner bending press 11 installed ahead of the feed roll 10 that continuously feeds the steel strip l at a constant speed, and an upper side corner bending press 11 installed ahead of the upper side corner bending press 11. A lower side corner bending press 1 is installed ahead of an upper side corner forming roll 12 that shapes the upper side of the semi-formed material 1α and applies a feeding force.
It consists of 3.

The upper side corner bending press 11 is configured to bend the left and right sides of the steel strip 1 at the upper and lower sides of a press frame 17, which is constructed by connecting upper and lower frames 14 and 15 with left and right side frames 16, as shown in FIGS. 1 to 3. Upper mold 1 that bends both sides upwards
8. A lower mold 19 is arranged. Above 18 is Fig. 6a
As shown in FIG. 2, it is divided into left and right halves, each supported by an upper frame 4 as shown in FIGS. As shown in FIG. 6, the lower mold 19 is divided into two parts on the left and right, as shown in FIG. has been decided. The lower die holder 21 is attached to the lower frame 1
Press cylinders 2 erected at regular intervals in the longitudinal direction on 5
3, and is adapted to move up and down while resting on the left and right side frames 16. The lower die 19 divided into left and right halves has a protruding portion 25 on the inner side of which the left and right sides located outside the upper die 18 have a tapered surface 24 that stands up from 0 to about 80 degrees in the longitudinal direction. It has a concave shape as a whole. The press frame 17 has a second
As shown in the figure, running rollers 26 are mounted on both left and right sides of the central portion of the lower surface of the lower frame 15, and guide rollers 27 are mounted on both rows of the lower frame 15 at regular intervals in the longitudinal direction. A running rail 28° guide rail 2 with a press frame 17 laid in a recessed part of the floor by a guide roller 27
9 so that it can run freely. and lower frame 1
Cylinder 3 for forward and backward movement installed on the floor at the front and rear ends of 50
0.31 are consecutive.

The lower corner bending press 13 is shown in Fig. 1 and Fig. 4.5.
As shown in the figure, a central part of a semi-formed material made by bending the left and right sides of a steel strip upward by 9 is placed inside a press frame 35 constructed by connecting upper and lower frames 32 and 33 with left and right side frames 34. Upper mold 36. Fold both left and right sides upward 9. A lower mold 37 is arranged. As shown in Fig. 7a, the upper mold 36 has two molds 36α on the left and right from the
As shown in FIG. 4.5, each part is supported by the upper frame 32 so that its width can be adjusted, and is positioned by a distance piece 38, and the rear mold 36b is independently supported by the upper frame 32 in a removable manner. and the lower end is the mold 3
It has the same width as 6b, and the upper part is narrower.

The lower mold 37 is divided into two parts on the left and right as shown in FIG. 7, each of which is supported by a lower mold holder 39 in a width-adjustable manner as shown in FIG. 4.5, and positioned by a distance piece 40. The lower die holder 39 is supported by press cylinders 41 which are vertically disposed at regular intervals on the lower frame 33, and is moved up and down by the left and right side frames 34. The lower mold 37 is divided into left and right halves.
The left and right sides located on the outside of the upper die 36 form a protrusion 43 having a tapered surface 42 on the inside that stands up from 0 to about 800-j in the longitudinal direction, and is formed in a concave shape as a whole. . As shown in FIG. This running roller 44. A running rail 46 on which the press frame 35 is laid in a recessed part of the floor by means of guide rollers 45. It is placed on a guide rail 47 so that it can run freely. Further, forward and backward movement cylinders 48 and 49 installed on the floor are connected to the front and rear ends of the lower frame 33.

Next, the operation of forming a steel strip into a rectangular steel pipe by the square steel pipe forming apparatus of the embodiment configured as described above will be explained. The steel strip 1 is continuously fed at a constant speed by a feed roll 10 to a position where the upper mold 18 and the lower mold 19 of the upper corner bending press 11 are open, as shown in FIG. 1.2.3. During feeding of the steel strip 1, when the steel strip 1 advances by a certain pitch, the cylinder 30 is operated at a speed synchronized with the feeding speed of the steel strip 1 to move the press frame 17 to the running roller 26. Running rail 28 via guide roller 27. advance on the guide rail 29, that is, the upper die 18. While moving the lower die 19 forward together, the press cylinder 23 is operated to raise the lower die holder 21 along the left and right side frames 16,
The lower die 19 presses the steel strip 1. The pressing of the steel strip 1 by the lower mold 19 is completed at the timing before the stroke end of the cylinder 30, and the steel strip 1 is pushed up at a timing such that the left and right ends of the steel strip 1 are folded downward at 19. This steel strip 1
Immediately after the bending of both the left and right parts 1111 of
, lower the lower mold 19 to release the strip steel plate 1, and at the same time actuate the cylinder 31 to retreat the press frame 17, that is, the upper mold 18. The lower mold 19 is moved back together and returned to its original position. Thereafter, the above-mentioned operation is continuously repeated, and the steel strip 1 passes through the upper corner bending press 11.
The left and right sides of the material 1 are bent upward to approximately 80° as shown in FIG.
α and eggplant.

The semi-formed material 1a, which has been passed through the press machine 11 and bent upward at approximately 80) on both the left and right sides of the steel strip 1, is bent by the upper corner forming roll 12 shown in FIG. The shape of the upper side is adjusted and at the same time
A force is applied and the upper mold 36 and lower mold 37 of the lower side corner bending press 13 are continuously fed at a constant speed into the open state shown in FIG. 4.5. In feeding the semi-forming material 1α, when the semi-forming material 1α advances by a certain pitch, the cylinder 48 is operated at a speed synchronized with the feeding speed of the semi-forming material 1α to advance the press frame 35, That is, the upper mold 36. At the same time as the lower mold 37 is moved forward together, the press cylinder 41 is activated to raise the lower mold holder 39 by resting on the left and right side frames 34, and the lower mold 37 presses the semi-molded material 1α. This lower mold 3
The suppression of the semi-molded material 1α by 7 is completed at the timing before the stroke end of the cylinder 48, and the semi-molded material 1α is pushed up at the timing to bend the left and right sides of the center portion of the semi-molded material 1α against the lower die 37. Once the left and right sides of the central part of the semi-formed material 1α have been bent, the press cylinder 41 is immediately operated in reverse to lower the lower mold holder 39, lower the lower mold 37, and release the semi-formed material 1α. At the same time, cylinder 49
is operated to move the press frame 35 backward, that is, the upper die 3
6. The lower die 37 is moved back together and returned to its original position.

Thereafter, the above-mentioned operation is continuously repeated to bend the left and right sides of the central part of the semi-formed material 1α passing through the lower corner bending press 13ft upward to approximately 80° as shown in FIG.

In this way, the semi-formed material 1α becomes a rectangular steel pipe blank 1b whose four corners are bent to approximately 80 degrees as shown in FIG.

This rectangular steel pipe blank 1b then undergoes the steps starting from the forming roll 214 explained with reference to FIG. 11, and is finally cut into a regular length to become a product P.

In the above embodiment, the press frame 17.35 is moved forward and backward by the lower frame 15.3 of the press frame 17.35.
Connected to the front and rear ends of 3 for forward movement.

Although the cylinders 30, 31 and 48, 49 for double movement are used in this example, the lower frame 15.
The press frame 17.35 may be moved forward and backward only by the cylinder 30.48 connected to the front end of the press frame 33.
In addition, the press frame 17.35 is driven by a reversible electric motor.
It may also be possible to move them forward and backward. In short, press frame 17.35 and steel strip plate 1. Any drive device may be used as long as it can advance and retreat in synchronization with the feed rate of the semi-forming material lα.0 (Effects of the Invention) As can be seen from the above description, the square steel tube forming apparatus of the present invention The upper side corner bending press machine and the lower side corner bending press machine are press framer drive devices for each press machine that support the upper and lower dies without moving them forward with individual cylinders. As the press frame moves forward and presses up the lower mold to perform press forming, the press frame driving device only needs to be able to generate enough force to move the weight of the press frame body through the rollers and on the rails. Since it travels forward on the travel rail and travel rollers via the travel rollers and guide rollers, there is little frictional resistance and it can be moved forward and forward with ease.

Therefore, each press can be easily moved forward at a speed synchronized with the feeding speed of the material to be molded, and the structure of the press is also extremely simple, and the drive device of each press is small and low-capacity. It has the effect that it can be used even if it is enough.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the square steel tube forming apparatus of the present invention, FIG. 2 is a sectional view taken along line A in FIG. 1, and FIG. 3 is a sectional view taken along line B-8 in FIG. 1. , FIG. 4 is a cross-sectional view taken along the line CC in FIG. 1, FIG. 5 is a cross-sectional view taken along the line D-D, and FIGS. A schematic perspective view of the mold, FIGS. 7a and 7b are schematic perspective views of the upper mold and lower mold of the lower corner bending press machine in the molding apparatus of the present invention,
Figure 8 is a perspective view showing the state of plastic deformation caused by the upper corner bending press machine and the lower corner bending press machine, and Figure 9 a * b + c shows the shape of the conventional large square steel pipe. Perspective view showing an example of the manufacturing method, No. 10
Figures a to d are perspective views showing other examples of the conventional method for manufacturing large square steel pipes, and Figure 11 is a schematic diagram showing a manufacturing line in the method for manufacturing square @ pipes developed by the present inventors.
FIG. 12 is a sectional view taken along the line I--I of the press machine for bending the upper side corner in the production line, and FIG. 13 is a sectional view taken along line U-Ni of the press machine for bending the lower side corner in the production line. 1... Steel band plate 1a... Semi-formed material 1b...
・Square steel pipe blank 11...Top corner bending press machine 13...°Bottom corner bending press machine 14...
Upper frame 15...Lower frame 16°it+frame 17...Press frame 18...Upper die 19...Lower die 20...Distance piece 21...Lower die holder 22...Distance piece 2 23...Press cylinder 24...Tapered surface 25...Protrusion part 26...° traveling roller
27...Guide roller 28...Traveling rail
29...Guide rail 30.31...Cylinder 32...Upper frame 33...Lower frame
34... Side frame 35... Press frame
36... Upper m 37... Lower mold 38... Distance piece 39... Lower mold holder 40.
...Distance piece 41°°. Press cylinder 42... Tapered surface 43...
Projection part 44... Traveling roller 45... Guide roller 46... Running rail 47... Guide rail 48.49... Cylinder Figure 9 Figure 12 Figure 13 Figure 10 +02 Procedure amendment form ( Method) September 25, 1985 ↑ To Akim Kuroda, Commissioner of the 7th License Agency, 111f Display 1985 Patent Application No. 71469 Car E'1.
Relationship with special ΔT career person G, 1il
The number of inventions increases by 7 due to the amendment, and the number of amendments to Akihata Tan's "Brief explanation of the drawings" is only 8. Contents of the amendment

Claims (1)

[Claims] Within the press frame with a rectangular cross section, two
The divided upper die is supported in a manner that allows its width to be adjusted, and is positioned using a distance piece. Press cylinders are erected on the lower frame at regular intervals in the longitudinal direction to move the lower die holder up and down. It is movably supported, and is divided into left and right halves on the lower mold holder, and has a diameter of 0 to approximately 80 mm in the longitudinal direction.
A concave lower die whose inner surface is a tapered surface that gradually rises up to 100 degrees is supported in a width-adjustable manner and positioned using a distance piece, and the press frame is reciprocated on a rail in the front-rear direction by a drive device. A press frame with a rectangular cross section supports an upper mold divided into two left and right parts from the front part to the middle part so that its width can be adjusted, and is positioned using a distance piece. Further, a single upper mold is removably supported on the upper frame from the middle part to the rear part, and the lower end has the same width as the divided upper mold and the upper part has a narrow width, and the upper mold is attached to the lower frame. Press cylinders are erected at regular intervals in the longitudinal direction to support a lower die holder so as to be movable up and down, and the lower die holder is divided into left and right halves and gradually erects from 0 to approximately 80 degrees in the longitudinal direction. A concave lower mold with a tapered surface as an inner surface is supported in a width-adjustable manner and positioned using a distance piece, and the press frame is reciprocated on a rail in the front-rear direction by a drive device. A corner bending press machine and a forming device for square steel pipes.