JP3007707B2 - Manufacturing method of flat deck plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously manufacturing a flat deck plate, and more particularly to a method for forming a hole such as a nail hole or a drainage hole and performing a width forming process in a press step before roll forming. As a result, it is possible to improve the productivity, simplify the process, and improve the product quality.

A flat deck plate comprising a flat portion F and a plurality of rows of leg portions L projecting downward from the flat portion, which are successively spaced apart from each other in the width direction, is widely used as a disposable formwork for concrete floor boards and the like. It is used. Conventionally, when manufacturing such a flat deck plate, nail holes required for nailing the flat deck plate to the pier of the formwork are obtained by cutting the roll-formed flat deck plate into a predetermined length, and then cutting the nail. When both ends are closed, drill holes are drilled by the punching die provided in the end-close mold, and drain holes for draining water generated during casting of concrete, mortar, etc. The legs are to be pressed and formed at equal intervals by a rotary blade in the forming machine.The flaring at one side end of the flat deck plate is performed by a roll forming process in which excess width is reduced by a slitter. Therefore, the scrap is wound up in a coil shape.

[0003] Further, the flat deck plate is positioned on the other side end of the flat deck plate so as to straddle the cutting position.
If a notch for avoiding the insertion part is necessary, the notch is to be applied by the shear mold provided in the end-close mold described above. The width of the other side end of the flat deck plate is to be widened by a width reduction process by a slitter in a final step of the line.

[0004]

However, in the prior art, first, when a nail hole is formed by a punching die provided in an end-close mold, the flat deck is formed by the end-close mold. It is difficult to accurately hold the plate in a predetermined position, and it is impossible to form a small diameter nail hole with a diameter of about 3 mm at the same time as end-close processing with relatively low dimensional accuracy. In addition to the low dimensional accuracy of the nail hole, there is a problem that the frequency of exchanging the drilling tool increases and the operating efficiency of the line is low.

Second, since the drain holes are cut at equal intervals by a rotary blade in a roll forming machine, the interval between the drain holes cannot be appropriately changed as required. In addition, the drainage hole has a rectangular outline shape, and therefore has drawbacks in terms of function as the drainage hole, and appearance and strength.

Third, according to the product shape and the thickness of the product after the roll forming, the position of the cutting blade of the slitter for the width-reducing processing which must be applied to one side end of the flat deck plate can be freely set. Since it is difficult to change it, there is a problem that the dimensional accuracy of the width reduction processing is low, and it is necessary to stop the line in order to remove the scrap wound in a coil shape.

Fourth, when forming a notch for avoiding an insertion portion at the other side end of the flat deck plate, a shearing die provided on an end-close mold is used. There is a problem that the time required for the replacement of the shearing type components and the like increases the down time of the line.On the other hand, when performing the width reduction by the slitter without performing the notching, one of the flat deck plates is required. As in the case of width reduction at the side end of
Due to the problem of dimensional accuracy, usually, a width loss of about 10 to 20 mm of the product has been forced.

The present invention provides a method of manufacturing a flat deck plate which solves all of the problems of the prior art.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to a continuous production of a flat deck plate comprising a flat portion and a plurality of legs projecting downward from the flat portion, each of which is sequentially provided in the width direction. In the step of the prenotch press before the band strip is roll-formed into a flat deck plate, a hole for cutting position detection is formed at the cutting position of the band strip, and a nail hole and Drilling holes are formed, and one side end of the strip is continuously reduced in width, and at least one of width reduction and notching is formed in the other side end of the strip. Then, while pressing the width-reduced end face of the one side end of the strip-shaped strip against the side guide, the strip-shaped strip is It is a manufacturing method of a flat deck plate and supplying the flop roll forming machine.

[0010]

In the method of manufacturing a flat deck plate, various processes before roll forming are performed, for example, on the basis of a command from an upper-level host computer input to an NC feeder and a subsequent prenotch press. Set length and pattern type that can be changed for each
While selecting the set number, etc., for the pre-notch press, each of the nail holes and drain holes provided on the basis of the hole punch type for cutting position detection, and for one side end of the strip strip. By operating the width-reducing shearing die and the width-reducing shearing or notching shearing type for the other side end, it can be applied by one pressing step before roll forming, and thereafter, the width is always reduced. The strip strip is supplied to the roll forming machine with the stripped end face of one side end of the strip strip to be subjected to the dropping processing as a centering reference plane, so that the strip strip has the expected dimensional accuracy. To be formed into a flat deck plate.

As described above, in the pressing step before the roll forming of the strip-shaped strip, by performing various processings on the strip-shaped strip, not only the processing accuracy of any processing can be sufficiently improved, but also the punching type, the shearing The mold and other molds can be effectively prevented from being damaged, the life of the mold can be greatly improved, and the required shape can be machined.

Therefore, in regard to nail holes, in addition to increasing the dimensional accuracy of the holes, the frequency of changing the mold can be reduced to greatly improve the line operation rate. In addition, the pitch between holes can be changed arbitrarily by changing the feed pitch of the strip-shaped strip, which enhances both the appearance and strength of the flat deck plate, and Thus, the original function of the drain hole can be sufficiently exhibited.

As for the width reduction of each side edge of the flat deck plate, the dimensional accuracy is improved to improve the material yield, and at the same time, the line stop for removing the scrap is not required at all. In addition, for notching, notch shearing die replacement, repair, etc. should be performed at the same time as other drilling dies, in other words, the entire press die should be replaced with another press die prepared in advance. The stop time of the line does not become extra long due to the work.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the relative positions of the respective dies in a press die used for carrying out the present invention.
This press die is arranged in a step of punching a hole for detecting a cutting position, which is a step before the roll forming of the strip-shaped strip, and can selectively operate each die.

In the drawing, an arrow A indicates a feeding direction of the strip-shaped strip fed at a pitch, and a two-dot chain line indicates a cutting position after the strip strip is roll-formed. In this case, a pair of two nail hole punching dies 2 located at the cutting position with reference to a position detecting hole punching die 1 that functions to drill a hole for detecting the cutting position at the cutting position of the strip. Are arranged at predetermined intervals in the width direction of the strip to be fed, and only when the predetermined cutting position of the strip reaches directly below them, the position detection hole punching die 1 and all By operating both of the nail hole punching die 2 and one of the cutting position detection holes located exactly corresponding to the cutting position, and the cutting position is separated,
A total of six nail holes, which are to be located at the center in the width direction of each flat portion of the flat deck plate to be formed, can be formed.

Further, on the rear side of the strip-shaped strip in the feed direction from the cutting position, the strip-shaped strip is located further rearward than the rear nail hole punching die 2, and a predetermined interval is also provided in the width direction of the strip-shaped strip to be fed. And three drainage hole piercing dies 3 are disposed at every time, and the drainage piercing dies 3 are provided every time the strip-shaped strip is fed, except when the above-described piercing dies 1 and 2 are operated. When activated, the drain holes, which are to be located at the center in the width direction of each leg of the flat deck plate to be formed, can be pierced at a required interval corresponding to the feed pitch of the strip strip.

Further, at a position corresponding to one side end portion of the strip to be fed, a drop-down shearing mold 4 whose position can be changed in the width direction of the strip is provided, and the shearing mold 4 is attached to the strip. Actuation at each pitch feed allows continuous stripping of one side end of the strip at the same pitch as the drain holes.

The width drop shearing die 4 has a width obtained by adding a margin to the maximum width of the width reduction process, and a length obtained by adding a margin to the maximum pitch of the drain holes. Having.

On the other hand, at a position corresponding to the other side end of the strip to be fed, a notching shearing type 5 serving also as a width reducing shearing type is arranged, and a flat deck which does not need to avoid an insertion portion is provided. When the plate is formed, the shearing die 5 is operated in the same manner as the above-mentioned width-dropping shearing die 4, so that the other side end portion of the strip-shaped strip is continuously unrolled. On the other hand, when a flat deck plate having a notch for avoiding the insertion portion is formed, the shearing die 5 is moved to the position detecting hole punching die 1 and the nail hole punching die 2 under the action of the die selecting device. Activated only at the time of operation to perform required notching.

Accordingly, the dual-purpose shearing mold 5 has a width that is somewhat wider than the maximum notching width, and has a length that is somewhat longer than the maximum pitch of the drain holes. Preferably, the shearing die 5 is widened in a trapezoidal shape on the rear side, in other words, on the side away from the shearing die 4, to facilitate insertion of the formed insertion piece.

FIG. 2 is a view showing a press die as described above.
It is a top view showing the example of processing to a strip strip. In this example, when the respective cutting positions B and C of the strip strip 11 indicated by the two-dot chain lines in the figure are fed to the positions corresponding to the position detection hole punching die 1, in addition to the width drop shearing die 4. Then, the position detecting hole drilling die 1 and the nail hole drilling die 2 are operated, and further, the combined shearing die 5 is operated as a notching shearing die, so that the position detecting holes B and C are located at the shearing positions B and C.
12 and six nail holes 13 are drilled at positions corresponding to the cutting positions B and C, respectively.
At one end of the strip-shaped strip 11, a continuous width-reducing portion 14 for widening is formed, and at the other side, a notch 15 for preventing the insertion portion is formed. For three pitch feeds between B and C, by operating only the draining hole punching die 3 in addition to the dropping shearing die 4, the continuous width dropping part 14 and the required interval can be maintained. And the drain holes 16 are formed in the strip-shaped strip 11 in the longitudinal direction.

As described above, by performing various required processes by pressing the band-shaped member 11 fed at a pitch, the positional accuracy and the dimensional accuracy of the process can be sufficiently improved. 1, 2, 3 and the shearing dies 4, 5 can be operated without difficulty, and their durability can be greatly improved. Further, the processing position, the contour shape of the processing portion, etc. can be changed in terms of function, appearance and The strength can be optimized. Moreover, it is not necessary to stop the line to remove the scrap.

In the above description, each of the nail holes 13 and the drain holes 16 is formed in the width direction of the strip 11 by three.
Although the holes are individually drilled, the number of holes is increased or decreased according to the number of rows of flat portions and legs of the flat deck plate to be formed.

When the strip strip 11 processed as described above is supplied to a roll forming machine while being positioned in the width direction, the strip strip 11 is disposed on the side end side where the notch 15 is formed. In this case, since the position in the width direction cannot be restricted,
At the side end portion on the side where the width reduction processing is constantly performed, the width reduction end face is, for example, as shown in FIG.
Under the action of a magnet roll 17 arranged at a slight angle to the width direction of the strip-shaped strip 11, the strip-shaped strip 11 is fed into a roll forming machine while being constantly in contact with a guide member 18, thereby reducing the width-reduced end face. Strip 11
Roll forming is performed as a centering reference plane at the width direction position.

In this way, the width-reduced end face is constantly pressed against the guide member 18 by the magnet roll 17,
Because I will not leave it, of the strip strip 11,
It is possible to perform roll forming while accurately maintaining the width direction position of the strip-shaped strip 11 without guiding the side end on the notch forming side at all.

FIG. 4 is a schematic diagram of a flat deck plate, in which a nail hole 13 is formed at an end-close portion at the front and rear ends of the flat portion F, and a drain hole 16 is provided at the bottom of the leg L. Is shown.

Here, as means for pressing the strip-shaped strip 11 against the guide member 18, not only a magnet roll but also an air cylinder or the like can be used.

[0028]

As described above, according to the present invention,
In addition to drilling holes such as nail holes, drain holes, etc., unique to flat deck plates, notches for avoiding insertion parts and width reduction are performed by pressing before roll forming. Compared to the conventional technology that performs processing in the roll forming machine and in the end closing process,
The productivity can be improved, the product quality can be improved, and at the same time, there is a great practical benefit that the processing steps can be simplified.

[Brief description of the drawings]

FIG. 1 shows a press die used for carrying out the present invention.
It is a figure which illustrates the relative position of each type | mold.

FIG. 2 is a plan view showing an example of press working on a strip strip.

FIG. 3 is a plan view showing an example of pressing a strip-shaped strip against a guide member.

FIG. 4a is a front view of a flat deck plate, and FIG. 4b is a side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Position detection hole drilling type 2 Nail hole drilling type 3 Drain hole drilling type 4 Width reduction shearing type 5 Notching shearing type 11 Band strip 12 Position detection hole 13 Nail hole 14 Width reduction part 15 Notch for avoiding insertion part 16 Drainage hole 17 Magnet roll 18 Guide member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 5/08 B21D 28/24 B21D 47/00 E04B 5/40

Claims (1)

(57) [Claims] 1. In a continuous production of a flat deck plate comprising a flat portion and a plurality of legs projecting downward from the flat portion, each of which is sequentially provided in the width direction, a strip strip is rolled on the flat deck plate. In the prenotch press process before forming, a hole for detecting the cutting position is formed at the cutting position of the strip.
At the same time , a nail hole and / or a drain hole is formed with reference to the position detection hole , and one side end of the strip is continuously tapered, and the other side end of the strip is processed. Applying at least one of a width-reducing process and a notching process to the portion, and then supplying the band-shaped strip to a roll forming machine while pressing the width-reduced end face of the one side end of the band-shaped strip against a side guide. A method for manufacturing a flat deck plate, comprising: