JPH0780552A - Method for forming strip-shaped material - Google Patents

Abstract

PURPOSE:To provide a method for forming a strip-shaped material where the metallic strip-shaped material such as steel strip can be formed in the prescribed section by the bending in the width direction by using a sufficiently small press for general use while keeping the sufficient dimensional precision from the beginning of the forming operation. CONSTITUTION:In a method where a continuous strip-shaped material 1 is bent in the width direction to be formed in the prescribed section, the upper and lower dies 2 where the shape of the forming grooves 21 are gradually changed close to the prescribed section as the dies approach from the rear end part (n) to the front end part (m), and finally changed to the prescribed section at the front end part (m) are mounted on a press 4. The continuous strip-shaped material 1 is intermittently traveled through the press 4, and the strip-shaped material 1 is pressed by the upper and lower dies 2 by the descending operation of the press 4 when the traveling is stopped while the strip-shaped material 1 is traveled when the press 4 is elevating, and the strip-shaped material 1 is passed a number of times through the intermittent traveling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a band-shaped material used when a metal band-shaped material such as a steel band is bent in the width direction to be formed into a predetermined sectional shape.

[0002]

2. Description of the Related Art Conventionally, when a metal strip material such as a steel strip is plastically processed into a predetermined cross-sectional shape, conventionally, the strip material (material) drawn from a drum is passed through a roll forming machine. 5-49368). In this case, a compressive stress acts on the material according to the degree of forming of the material when passing through the forming roll, and a bending moment acts on the roll shaft, and these compressive stress and bending moment are The larger the degree of molding, the larger. However, if the compressive stress acting on the material is too large, smooth running of the material becomes difficult, and if the bending moment acting on the roll shaft becomes excessive, the bending of the roll shaft is Therefore, it becomes difficult to perform molding with a predetermined dimensional accuracy. Therefore, in the roll forming machine, a plurality of forming rolls gradually approaching the final forming cross-sectional shape are arranged in tandem, and the forming amount is distributed to these rolls.

[0003]

As described above, in the roll forming machine, it is necessary to dispose a plurality of forming rolls in tandem. Especially, a thick material or a material having high hardness is used. When the degree of molding is large, it is necessary to remarkably increase the number of molding rolls. Therefore, when arranging the molding rolls in tandem, the installation space of the roll bearings and the stand, and further the incorporation of the drive mechanism into each roll,
A fairly wide space must be provided between the rolls, and when the number of molding rolls becomes large, the roll molding machine must be lengthened due to the accumulation of the wide spaces, which is disadvantageous in terms of installation space. Is.

Further, in the roll forming machine, each roll arranged in tandem has its own unique elements depending on the product such as the shape of the roll, its sequence and pass line, and the rolls having different shapes are formed. -It is not easy to mold different products by simply replacing the cable, and it requires a high degree of skill, which is disadvantageous in that it lacks versatility.

Further, in roll forming, mutual interference of driving between rolls is eliminated, and each roll is prevented from exerting a tensile force on a material portion between the rolls at the initial stage of forming. It is necessary to stabilize the product shape by adjusting the reduction of
There is also a disadvantage that such adjustment requires a great number of man-hours.

An object of the present invention is to form a metal strip-shaped material such as a steel strip into a predetermined cross-sectional shape by bending in the width direction by using a sufficiently small general-purpose press machine to obtain sufficient dimensional accuracy. The object of the present invention is to provide a method for forming a band-shaped material that enables it while guaranteeing it from the beginning.

[0007]

A method of forming a strip-shaped material according to the present invention is a method of bending a continuous strip-shaped material in a width direction to form a predetermined cross-sectional shape, in which a forming groove is formed from a rear end portion to a front end portion. Gradually approach the above predetermined cross-sectional shape and attach the upper and lower molds having the predetermined cross-sectional shape at the front end to the press machine,
The continuous strip material is intermittently run through the press machine, the strip material is pressure-molded by the above-mentioned upper and lower molds by the descent operation of the press machine when the traveling is stopped, and the strip material is run while the press machine is rising, The belt-shaped material is passed through the upper and lower molds a number of times by intermittent running.

[0008]

If the length from the forming groove starting end (forming groove rear end) in the forming groove between the upper and lower dies to the portion having the predetermined cross-sectional shape of the product is L, and the running distance per intermittent running is a, With one run of intermittent running and one time of pressure molding, (a / L) × 100% of the total molding amount is molded, and the same material part is pressed (L / a) times and pressed to a predetermined position. It is formed into a cross-sectional shape.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a metal strip 1 formed by the present invention.
An example of the cross-sectional shape of is shown in FIG.

FIG. 2A is a side explanatory view of an example of the upper and lower molds 2 used in the present invention, and FIGS.
2 (e) is a cross-sectional view or a cross-sectional view taken along the line of FIG. 2 (a).

In FIG. 2 (a) to FIG. 2 (e),
Reference numeral 21 denotes a forming groove, which gradually approaches the above W shape from the rear end portion to the front end portion, and the point n is the starting point of the forming groove 21, and the above point W has the above W shape. The forming groove 22 in the front part of the point m has the W-shaped uniform cross section and is used for shaping.

A puncher 23 is provided immediately after the rear end portion,
24 is a punch table, and the puncher 23 is a cylinder-2.
5, the punch table 24 is slidably supported on the rear end side of the upper die so that the punch table 24 can be separated from the punch table 24 and the separation operation can be performed every predetermined number of times of lifting and lowering of the press described later. A preset counter 26 for the number of up and down movements of the press is connected to a cylinder-25.

FIG. 3 shows an example of a molding apparatus used in the present invention, 3 is a feeding drum for the band-shaped material 1, 4 is a press machine, and 2 is the above-mentioned upper and lower molds mounted on the press machine 4. ,
23 is a puncher, 24 is a punch stand, and 5 is a take-up roll.

According to the present invention, in order to form the cross section of the metal strip 1 such as a steel strip into the predetermined W shape, the strip 1 drawn from the drum 3 is passed through the upper and lower molds 2 of the press machine 4. The take-up roll 5 is intermittently taken over by intermittent take-up, and when the running is stopped, the press machine 4 is lowered to press-form the belt-shaped material 1 with the upper and lower molds 2, and the press machine 4 is raised. Sometimes strip 1
After that, the above operation is repeated under the condition that the belt 1 is intermittently run and the press machine 4 is vertically moved.

Further, the number of times the press 4 is moved up and down is counted by the preset counter described above, and the puncher 23 is brought right above the punch table 24 by the operation of the cylinder for each preset number of times, and the puncher 23 is used as the upper metal. It is lowered together with the die, further raised together with the upper die, then separated from just above the punch table 24, and made to stand by for the next punching work, and the punching work is performed on the band-shaped material 1 every predetermined number of times of raising and lowering the press machine 4. I will give it.

In the above description, the length from the molding groove starting end (molding groove rear end) n in the molding groove 21 between the upper and lower molds to the portion m having the predetermined cross-sectional shape of the product is L (FIG. 2), and the belt-shaped material is predetermined. Assuming that the amount of forming required to form the cross-sectional shape of b is b, the amount of forming when the strip-shaped material travels a unit distance in the forming groove is
It is L. Thus, when the running distance per one running of the belt-shaped material is intermittently traveled, the molding amount for molding the belt-shaped material per one traveling is ab / L, which is relative to the total molding amount b. During one cycle of intermittent running and pressure molding, molding of (a / L) x 100% of the total molding amount is performed, and the same material part is pressed and pressed (L / a) times It is formed into a cross-sectional shape.

When the preset number of the preset counter of the puncher is n, the distance na to the belt-shaped material is
A punch is given for each. In the present invention, if the one running distance a for intermittent running of the belt-shaped material is reduced, the molding rate (a / L) × 100% per one running / press molding can be reduced, and the press pressure can be lowered. Although it is possible to use a small press, the number of press pressings (L / a) at the same material location becomes large and the working speed becomes low. On the other hand, if the one running distance a of the intermittent running of the band-shaped material is increased, the number of pressurizations (L / a) at the same material location becomes small and the working speed can be increased. Forming rate per pressure forming (a /
L) × 100% is large, and it is necessary to increase the pressing pressure. Therefore, one running distance a of the intermittent running of the strip is
These points are set in consideration of each other. For example, the above L
Is 400 mm, the strip-shaped material is 64 mm wide, the steel strip is 1 mm thick, and the predetermined cross-sectional shape is W-shaped with a width of 25 mm, a is 3
It is preferably set to 0 mm to 40 mm.

It should be noted that one running distance a of the belt-shaped material is intermittently run.
When the value is increased, the number of pressing times (L / a) at the same material location becomes small and the molding surface becomes rough. Therefore, it is preferable to lengthen the shaping section 22 in FIG.

In the above embodiment, the band-shaped material is punched 11 as shown in FIG. 4 (a), but the punching may be omitted as shown in FIG. 4 (b). it can.

In the above embodiment, the band-shaped material has a W-shaped cross-section, but the shape is not limited to this, and any shape can be used as long as the band-shaped material is bent in the width direction. it can. For example, a sectional shape as shown in FIG. 4C can be used.

According to the present invention, a predetermined cross-sectional shape, for example,
The W-shaped metal strip material can be used, for example, as a reinforcing material for rehabilitation of an aged pipe, (a) of FIG. 5 shows the state of rehabilitation work, and (b) of FIG. The enlarged view in the dotted-line frame in (a) is shown.

In FIG. 5A, 61 indicates an aged underground pipe and 62 indicates a manhole. 63 is
As shown in (b) of FIG. 5, a fitting projection 631 is provided on one outer surface of both width ends, and a fitting recess 632 is provided on the other inner surface.
A belt-shaped tube made of synthetic resin, which is provided with T-shaped ribs 633, ...
Through the manhole 62 to be spirally bent by the pipe-making roll 60, and as shown in FIG. 5B, the fitting convex strip 631 and the concave strip 632 are fitted with an adhesive. The tubular body P is formed into a tubular body P, and the tubular body P is fed into the aging pipe 61.

Reference numeral 3 denotes a supply drum for the metal strip 1 described above, 4 denotes a press, and 5 denotes a take-up roll, which are installed on the ground. The take-up roll 5 can be feed-bent.

Reference numeral A denotes a metal strip having a W-shaped cross-section formed by the present invention, which is intermittently taken up by a take-up roll 5 and is formed into a spiral shape by a feed bending process, and passes through a manhole 62. As shown in FIG. 5B, the guide roll 64 allows the rib 63 on the outer surface of the synthetic resin tubular body to be formed.
It is inserted between 3,633 and used as a reinforcing material for the synthetic resin tubular body.

In FIG. 5A, when the extension of the synthetic resin tubular body P reinforced by the W-shaped metal strip into the aged pipe 61 is completed, the tubular body P and the aged pipe 61 are separated from each other. The waterproofing agent is injected, and in FIG. 5B, the injecting waterproofing agent is also filled in the bottom portions of the ribs 633, 633 on the outer surface of the synthetic resin tubular body through the punched holes of the W-shaped metal strip A.

[0026]

The band-shaped material forming method according to the present invention is configured as described above, and the material is intermittently fed and molded into the final cross-sectional shape by pressing a plurality of times.
It is a gradual molding and can be molded with sufficient dimensional accuracy.

Further, even in the gradual forming, the tandem roll
Since the pass line can be remarkably shortened as compared with the roll molding in which a considerable space must be provided between the rolls, a general-purpose small press can be used and the problem of the installation space can be solved.

Further, different cross-sectional shapes can be formed by exchanging molds, and a variety of products can be easily manufactured as compared with roll forming which requires a high degree of skill in roll exchange. You can

Furthermore, rather than a system such as the roll molding method in which the elements of the previous stage influence the elements of the latter stage, a constant and stable molding dimensional accuracy can be guaranteed from the initial stage.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a molded strip material molded according to the present invention.

2 (A) is a side view showing an example of the upper and lower molds used in the present invention, FIG. 2 (B) is a cross-sectional view taken along the line of FIG. 2 (A), and FIG. 2 (a) is a sectional view taken along the line of FIG. 2 (a), FIG. 2 (d) is a sectional view taken along the line ni of FIG. 2 (a), and FIG. 2 (e) is shown in FIG. 2 (a). FIG. 6 is a cross-sectional view taken along line HO in FIG.

FIG. 3 is an explanatory view showing an example of a molding apparatus used in the present invention.

4 (a) to (c) are perspective views showing different shaped strips formed according to the present invention.

5 (a) is an explanatory diagram showing the rehabilitation work of an aged pipe using the strip-shaped material molded according to the present invention, and FIG. 5 (b) is a dotted line frame in FIG. 5 (a). FIG.

[Explanation of symbols]

 1 band-shaped material 2 upper and lower mold 21 forming groove 23 puncher 24 punch table 3 drum 4 press machine 5 intermittent take-off roller

Claims (1)

[Claims] 1. A method for bending a continuous strip in a width direction to form a predetermined cross-sectional shape, wherein a forming groove gradually approaches the predetermined cross-sectional shape from the rear end portion to the front end portion, and the groove is formed at the front end portion. The upper and lower molds having a predetermined cross-sectional shape are mounted on a press machine, a continuous belt-shaped material is intermittently run through the press machine, and when the traveling is stopped, the belt-shaped material is pressure-formed by the lowering operation of the press machine by the above-mentioned upper and lower molds. Then, the method for forming a band-shaped material is characterized in that the band-shaped material is made to travel while the press machine is rising, and the band-shaped material is passed through the upper and lower molds a number of times by intermittent running.