JPH04294823A - Manufacture of flat deck plate - Google Patents

Abstract

PURPOSE:To improve productivity, to simplify processes and to improve the quality of a product. CONSTITUTION:In the press operation before a beltlike strip 11 is roll-formed into a flat deck plate, at least needle holes 13 and drain holes 16 are provided on the beltlike strip 11 and the one side end part of the beltlike strip 11 is subjected to edging continuously, at least one of the edging and notching is performed on the other side end part. Thereafter, as the edging end face of the one side end part is pressed to a side guide 18, the beltlike strip 11 is supplied to a roll forming machine.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a continuous manufacturing method for flat deck plates, and in particular, drilling of nail holes, drain holes, etc., and tentering are performed in a pressing process before roll forming. This improves productivity, simplifies processes, and improves product quality.

[0002] A flat deck plate, which is made up of a flat part F and a plurality of rows of leg parts L protruding downward from the flat part, spaced apart from each other in the width direction, is widely used as a disposable formwork for concrete floor boards, etc. It is used. Conventionally, when manufacturing such flat deck plates, the nail holes required for nailing the flat deck plate to the crosspieces of the formwork were created after cutting the roll-formed flat deck plate to a predetermined length. When both ends are closed, a hole is drilled using a perforation mold provided in the end-closed mold, and a drainage hole is created in the flat deck plate when it is roll-formed to drain water that occurs when pouring concrete or mortar. The legs are press cut at equal intervals using a rotating blade in the molding machine, and the width at one side end of the flat deck plate is created by cutting off the excess width using a slitter during the roll forming process. This is done by winding the scrap into a coil.

[0003]Furthermore, at the other side end of the flat deck plate, there is a
If a notch to avoid the insertion part is required, the notching is performed using the shear mold provided on the end-close mold described above.On the other hand, if a notch to avoid the insertion part is not required, the notching is done by The width of the other side end of the flat deck plate is increased by width reduction using a slitter in the final process of the line.

0004

[Problems to be Solved by the Invention] However, in this prior art, firstly, when forming a nail hole with a perforation mold provided in an end-close mold, the end-close mold is used to form a flat deck. It is difficult to accurately hold the plate in the specified position, and it is structurally unreasonable to form a small nail hole with a diameter of around 3 mm at the same time as end closing processing with relatively low dimensional accuracy. In addition to the low dimensional accuracy of the nail holes, there is a problem in that the drilling tools have to be replaced frequently, resulting in low line operating efficiency.

[0005] Secondly, since the drain holes are cut at equal intervals by a rotary blade in the roll forming machine, it is not possible to change the distance between the drain holes as necessary. Further, the drain hole has a rectangular outline, and therefore has problems in function as a drain hole, as well as in terms of appearance and strength.

Thirdly, the position of the cutting blade of the slitter can be freely adjusted according to the product shape and plate thickness after roll forming, for the width reduction process that is required to be performed on one side end of the flat deck plate. Since it is difficult to change, there is a problem that the dimensional accuracy of the width reduction process is low, and furthermore, it is necessary to stop the line to remove the coiled scrap.

Fourthly, when forming a notch to avoid the insertion part at the other side end of the flat deck plate, a shearing die provided in the end-close mold is used. There is a problem in that the time required to replace shearing type components and other operations increases line downtime.On the other hand, when performing width reduction processing using a slitter without performing notching processing, one side of the flat deck plate As in the case of width reduction processing at the side edges of the product, there is a problem with dimensional accuracy, and it is usually
This resulted in a width loss of approximately 1.2 m.

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

[0009]

[Means for Solving the Problems] A first method of the present invention provides a flat deck plate comprising a flat portion and a plurality of leg portions protruding downward from the flat portion, each of which is spaced apart in the width direction. During manufacturing, in the pre-notch press process before the strip is roll-formed into a flat deck plate, one side edge of the strip is continuously reduced in width, and the other side edge of the strip is , performing at least one of width reduction processing and notching processing, and then supplying the band-shaped strip to a roll forming machine while pressing the width reduction end surface of the one side end of the band-shaped strip against a side guide. A second method of the present invention includes the step of drilling a nail hole and/or a drainage hole before reducing the width of one side end of the strip. This is a method for manufacturing a flat deck plate.

0010

[Function] In this flat deck plate manufacturing method, various processes before roll forming are performed, for example, based on commands from a host computer on a host computer, input to an NC feeder and a pre-notch press that follows, to produce a single sheet. Setting length and pattern type that can be changed for each
While selecting the number of pieces to be set, etc., the pre-notch press's hole type for nail holes and drainage holes, which are set based on the hole type for detecting the cutting position, as well as for one side end of the strip. By activating a width-reducing shear die for the side edge and a width-reducing shear die or a notching shear die for the other side edge, it can be applied in one pressing step before roll forming, and thereafter the width is always reduced. By feeding the strip to a roll forming machine using the width drop end surface of one side end of the strip that is subjected to the drop processing as a centering reference plane, the strip can be made with the desired dimensional accuracy. It will be molded into a flat deck plate with.

[0011] As described above, by subjecting the strip to various types of processing in the pressing process before the roll forming of the strip, it is possible to sufficiently improve the processing accuracy of any processing, as well as perforation type, shearing, etc. Damage to the mold and other molds can be effectively prevented, the life of the mold can be greatly improved, and the mold can be processed into a desired shape.

Therefore, with regard to nail holes, in addition to improving the dimensional accuracy of the holes, it is possible to reduce the frequency of mold replacement and greatly improve the line operation rate, and with regard to drainage holes, the contour shape of the holes can be improved. In addition to making it possible to achieve the desired result, by selecting the feed pitch of the strip,
The hole spacing can be changed arbitrarily, and as a result, both the appearance and strength of the flat deck plate can be improved, and the original function of the drain holes can be fully demonstrated.

[0013] Regarding the width reduction processing of each side end of the flat deck plate, it is possible to improve dimensional accuracy, improve material yield, and eliminate the need to stop the line for scrap removal at all. Furthermore, regarding the notching process, the notching shear mold can be replaced or repaired at the same time as other perforation molds, or in other words, the entire press mold can be replaced with another press mold prepared in advance. By doing so, the line will not have to be stopped for a particularly long time.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the relative positions of each mold in a press mold used for implementing this invention,
This press mold is arranged in the step of drilling a hole for detecting the cutting position, which is a pre-process of roll forming the belt-shaped strip, so that each mold can be selectively operated.

In the figure, arrow A indicates the feeding direction of the belt-like strip that is pitch-fed, and the two-dot chain line indicates the cutting position of the belt-like strip after roll forming. Here, a position detection hole punching die 1 that functions to drill a hole for detecting the cutting position at the cutting position of the band-like strip is used as a reference, and a pair of nail hole punching die 2 located at a distance from the cutting position are used as a reference. are arranged in three pairs at predetermined intervals in the width direction of the belt-like strip to be fed, and only when the predetermined cutting position of the belt-like strip reaches directly below them, the position detection hole punching type 1 and all By operating both the nail hole punching die 2 and the nail hole punching mold 2, one cutting position detection hole is located exactly corresponding to the cutting position, and the flat deck plate is located across the cutting position and is formed. A total of six nail holes located at the center in the width direction of each flat part can be drilled respectively.

Further, on the rear side of the cutting position in the feeding direction of the strip, there is provided a nail hole punching mold 2 located further behind the rear nail hole punching die 2, which is also spaced at a predetermined interval in the width direction of the strip to be fed. Three drainage hole perforation molds 3 are arranged, and these drainage hole perforation molds 3 are operated every time the belt-like strip is pitch-fed, except when the respective perforation molds 1 and 2 described above are operated. By activating it, drain holes, which will be located at the center of each leg in the width direction of the flat deck plate to be formed, can be drilled at required intervals corresponding to the feeding pitch of the belt-like strips.

Furthermore, a width-reducing shearing die 4 whose position can be changed in the width direction of the strip is provided at a position corresponding to one side end of the strip to be fed. By operating at each pitch feed, it is possible to continuously reduce the width of one side end of the strip at a pitch equal to that of the drainage holes.

Note that this width-reducing shear mold 4 has a width that is equal to the maximum width that can be removed during the width-reducing process, plus some margin, and a length that is equal to the maximum pitch of the drain holes and some margin. has.

On the other hand, a notching shearing die 5 which also serves as a width reduction shearing die is disposed at a position corresponding to the other side end of the belt-shaped strip to be fed, and a flat deck which does not need to avoid the insertion part is installed. When forming the plate, the shearing mold 5 is operated in the same manner as the width reduction shearing mold 4 described above, so that the other side end of the band-like strip is continuously widened. On the other hand, when molding a flat deck plate with a notch for avoiding the insertion part, under the action of the mold selection device, the shear mold 5
is operated only when the position detection hole punching die 1 and the nail hole punching die 2 are operated to perform the required notching process.

Therefore, this dual-purpose shearing die 5 has a width somewhat wider than the maximum notching width, and a length somewhat longer than the maximum pitch of the drainage holes. Preferably, the shearing mold 5 is made trapezoidally wide toward its rear side, in other words, toward the side away from the shearing mold 4, so that the formed insertion piece can be easily inserted.

FIG. 2 shows the press mold as described above.
FIG. 3 is a plan view showing an example of processing into a belt-like strip. In this example, when the respective cutting positions B and C of the belt-shaped strip 11 indicated by the two-dot chain lines in the figure are pitch-fed to the positions corresponding to the position detection hole punching mold 1, the cutting positions B and C are added to the width reduction shear mold 4. Then, the position detection hole drilling mold 1 and the nail hole drilling mold 2 are operated, and the dual-purpose shearing mold 5 is operated as a notching shearing mold, thereby forming the position detection holes 12 at the shearing positions B and C. , six nail holes 13 are drilled at positions symmetrical to each of the cutting positions B and C, and a continuous width drop is provided at one end of the belt-like strip 11 for width adjustment. A notch 15 for avoiding the insertion part is formed in the part 14 and the other side part, respectively, and
For three pitch feeds between the respective cutting positions B and C, by operating only the drain hole punching die 3 in addition to the width dropping shearing die 4, a continuous width dropping portion 14,
Drain holes 16 are formed at required intervals, and these steps are repeated in the length direction of the belt-like strip 11.

[0022] In this way, by performing various required machining by press working on the pitch-fed belt-shaped member 11, the positional accuracy and dimensional accuracy of the machining can be sufficiently increased. 1, 2,
3 and shearing molds 4 and 5 can be operated without difficulty, their durability can be greatly improved, and furthermore,
The processing position, contour shape of the processing portion, etc. can be optimized in terms of function, appearance, and strength. Furthermore, there is no need to stop the line to remove scrap.

In the above description, three nail holes 13 and three drain holes 16 are each formed in the width direction of the strip 11. It will be increased or decreased depending on the number of rows of flat parts and leg parts of the plate.

[0024] By the way, when feeding the belt-shaped strip 11 processed as described above to a roll forming machine while positioning it in the width direction, the belt-shaped strip 11
Since the position in the width direction cannot be controlled on the side end side where the notch 15 is formed, here, the side end of the belt-like strip 11 on the side where the width reduction process is regularly performed. At this point, as shown in FIG. 3, for example, as shown in FIG. By feeding the strip 11 into a roll forming machine, the width drop end face is
Roll forming is performed as a centering reference surface for the widthwise position of the band-shaped strip 11.

[0025] With this arrangement, the width-dropping end face is always pressed against the guide member 18 by the magnet roll 17 and does not move away from the guide member 18, so that the strip 1
It becomes possible to perform roll forming while accurately maintaining the width direction position of the belt-like strip 11 without any guide of the side end on the side where the notch is formed.

FIG. 4 is a schematic diagram of the flat deck plate manufactured in this manner, in which nail holes 13 are formed in the end closing portions of the front and rear ends of the flat portion F, and drain holes 16 are formed in the bottoms of the leg portions L. This shows lattice matching with .

Note that as a means for pressing the band-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]

[Effects of the Invention] As explained above, according to the present invention,
In addition to drilling holes such as nail holes and drain holes, which are unique to flat deck plates, forming notches to avoid insertion parts and reducing the width are performed by press processing before roll forming. Compared to conventional technology in which machining is performed inside a roll forming machine or in the end-close process, this technology improves productivity, improves product quality, and simplifies the machining process. will bring great benefits.

[Brief explanation of drawings]

FIG. 1: In a press mold used for carrying out this 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 band-like strip.

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

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

[Explanation of symbols]

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

Claims (2)

[Claims] Claim 1: In the continuous production of a flat deck plate, which has a flat part and a plurality of legs protruding downward from the flat part, each of which is successively spaced apart in the width direction, a band-shaped strip is rolled onto the flat deck plate. In the pre-notch press process before molding,
One side end of the band-like strip is continuously reduced in width, and at least one of width reduction and notching is applied to the other side end of the band-like strip. A method for manufacturing a flat deck plate, which comprises feeding the belt-shaped strip to a roll forming machine while pressing the reduced width end face of one side edge against a side guide. 2. In the continuous production of a flat deck plate, which has a flat portion and a plurality of legs protruding downward from the flat portion, each of which is spaced apart in the width direction, the strip is rolled onto the flat deck plate. In the pre-notch press process before molding,
At least a nail hole and/or a drainage hole are formed in the belt-like strip, and one side end of the belt-like strip is continuously reduced in width, and the other side end of the belt-like strip is The method is characterized in that at least one of a width reduction process and a notching process is performed, and then the band-shaped strip is fed to a roll forming machine while pressing the width-reduced end surface of the one side end of the band-shaped strip against a side guide. A method for manufacturing flat deck plates.