JP3315860B2 - Grating molding method - 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 forming a grating to be mounted on the upper end of a groove.

[0002]

2. Description of the Related Art A grating 1 mounted on an upper opening of a groove body and covering the upper part of the groove body (see FIG. 4) is a bearing bar 2 of a band material such as an I-shaped cross section serving as a main support material. Are arranged in parallel with the band width direction being vertical, and several connecting bars 3 for fixing the arrangement posture of the bearing bar 2 are arranged orthogonally, and furthermore, at both ends of the bearing bar 2. A lattice body to which the side plate 4 is fixed is formed, and a bearing bar 2 is provided in a shelf-shaped mounting groove at an upper opening of a groove body such as a U-shaped groove.
Are mounted with both ends thereof mounted thereon, and have a structure in which vehicles and pedestrians can pass on the upper surface thereof.

In the grating 1, the bearing bars 2 arranged side by side at predetermined intervals are fixed by a connecting bar 3 such as a round bar so as to fix the bearing bars 2 to such an extent that the juxtaposed posture of the bearing bars 2 is not destroyed, and the shape is adjusted. Then, a side plate 4 of a band material is welded to both ends of the bearing bar 2 to form a grating 1 of a square lattice body.

[0004]

In the conventional grating 1 described above, it is necessary to safely and sufficiently support the passing load of a heavy-duty vehicle such as a large truck passing over the upper surface by a bearing bar 2 arranged in a vertical position. In addition, the vertical arrangement posture of the bearing bar 2 is characterized by a structure in which the side plates 4 fixed to both ends function as a main holding member. Therefore, the welding of the side plates 4 to the bearing bar 2 in the above-described molding method is not required. In addition, it is indispensable to fix and hold the bearing bar 2 in the vertical posture, which is easy to fall down, by the side plate 4 and to ensure high-quality welding performance capable of withstanding the passing load. Therefore, the welding process requires careful consideration and a high level of strength inspection, and is complicated to manage, which hinders the molding productivity of grating.

In the conventional grating 1, the welding step of the bearing bar 2 and the side plate 4 is positioned as “an important step for ensuring the performance of the grating”, and high level management is required. A pre-process for combining the bars 3 in a grid, and a side plate 4
In the process of welding, the process contents are different as a method of construction, so that both processes have to be separated. Therefore, there is no continuity of a series of processing steps of the grating forming, and a waste such as an increase in the number of work-in-progress movements during the process of moving the primary molded product to the side plate welding process or a welding process occurs,
The presence of the welding step is a factor that hinders high grating costs and rationalization of the molding step.

[0006] The present invention provides a grating forming method which solves the above-mentioned drawbacks of the prior art.

[0007]

The grating forming method of the present invention which solves the above technical problems is to provide a "grid body consisting of bearing bars arranged at required intervals with the band width direction being vertical. A bent piece is formed by bending both ends of the bearing bar in the direction of the bearing bar adjacent thereto, and the bent piece and the bearing bars at both ends arranged side by side form an edge frame of the lattice body. In forming the grating of the structure, long bearing bar materials are arranged side by side at a required pitch and sent sequentially to the automatic grating forming apparatus, and at the first processing station, the connection bar cut into a predetermined size is cut into the bearing bar material. Supply and fix by welding
Subsequently, the bearing bar material fixed in the side-by-side posture by the connecting bar is cut into a predetermined length to form a primary molded body of a lattice body in which both ends of the bearing bar become tongue-shaped protruding pieces. The primary molded body is sequentially fed to a second processing station, and is bent by a bending roller moving on a movement locus.
And simultaneously bending the entire number of the projecting pieces
And automatically forming the grating sequentially and continuously.

That is, the grating of the present invention having the above-described structure has
The molding method is a lattice body with straight bearing bar material
A primary molded body formed in advance is formed in advance, and thereafter, the primary molded body is formed.
The straight protruding pieces on both sides of the molded body are
All of the pieces are bent simultaneously by the bending roller mechanism.
It is characterized by a molding method for making the grating.

[0009]

The above-described method of forming a grating according to the present invention uses a groove.
It is placed on the upper end of the body and becomes the carrying point of the passing load
Both ends of the bearing bar are bent, and other than the bent part
Since it has a straight bent bar shape at both ends,
The welding process can be omitted by eliminating the existing side plate.
Runode, both the molding process grating is simplified,
Fully automatic coupling of a series of grating forming processes
A molding line can be configured.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the gray of the first embodiment of the present invention will be described.
The method of forming the etching will be described in detail with reference to FIG.
First, the structure of the grating 1 formed in this embodiment will be described.
explain. That is, the width direction of the cross-section I-shaped strip is set to be vertical.
A bearing bar 2 juxtaposed at a predetermined interval L,
Biting into the upper end of the bearing bar 2 and welding
2 and several connecting bars 3 arranged and fixed orthogonal to
Bar 3 is a twist bar with a twisted square bar)
In grating 1 of the installed grid,
-2 project from the outermost connecting bar 3
From the middle bending point 6
Bend in the direction of the ring bar 2 and next to the bearing bar 2
Equipped with a curved piece 5 that fills the tangent space
By the bearing bars 2 at both ends of the force, the edge frame of the grid is
And the side plate 4 of the conventional structure is omitted.
You.

Each of the flexible pieces 5 has a tip
Bite into the side of the adjacent bearing bar 2 and forcibly join
And have a structure that is linked mechanically to each other,
Both ends of a single bearing bar 2 are in the middle straight section
On the other hand, it has a substantially Z shape bent in the opposite direction.

The grating having the above structure
1 is formed by the following method and procedure. That is, (in FIG. 1
(C)), the long bearing bar material 9 has a predetermined pitch
L for automatic molding machines that are arranged side by side and fed in the longitudinal direction.
Be paid. And the first processing station of the automatic molding machine
In the option 20, the long connecting bar material is automatically caught to a predetermined length.
Bearing bar material 9 in which the connected connecting bars 3 are arranged side by side
It is set by automatically feeding above.

Subsequently, the connecting bar 3 was placed and set.
The local portion of the bearing bar material 9 is electrically heated and connected.
The connecting bar 3 is pressed into the upper end portion of the bearing bar material 9 and connected.
The bearing press
The parallel posture of the members 9 is fixed by the connecting bar 3 to form a grid.
Molded. Then, the bearing bar 9 in the vertical position is
For a cutting mechanism or a cutting grinder that sandwiches each
Therefore, 9 groups of bearing bar materials are cut at once, and
A grid consisting of the arranging bar 2 and the connecting bar 3
Each end of the arranging bar 2 is approximately 2 of the distance L.
One having a tongue-shaped protruding piece 7 having a double protruding span S
The next molded body 8 is formed.

Then, the primary molded body 8 is used for the automatic molding.
Machine to the second processing station 21 and press bending
Each of the protruding pieces 7 protrudes by the bending mechanism by the mold.
Bearing adjacent from bending point 6 in the middle of span S
Formed into a flexible piece 5 bent approximately 90 ° toward the direction of the bar 2
Processed. Then, the tip of the bent piece 5 is
Biting into the side of the wing bar 2 and forcibly pressed against each other,
The grating 1 shown in FIG. 1A is formed.

The bending processing in the second processing station 21 is performed by the following method . That is, FIG.
), The receiving projection 1 which is inserted into the latter half of the mutual space of the projecting piece 7 of the primary molded body 8 and embeds the latter half of the mutual space.
A bending receiving die 16 in which the mold 4 is erected on a mold base 15 and a bending roller 13 which is inserted in the first half of the mutual space and joins the outer periphery to the protruding piece 7 are erected on the die base 15. The bending die 17 is composed of a combination of a pressing die 17 and a bending receiving die 16.
The second working station 21 is constituted by a bending mechanism configured to be relatively movable by hydraulic drive.

[0016] Then, one of the materials sent to the bending mechanism in order is
The next molded body 8 is automatically set, and the forming die 17 is formed.
And move the center of the bending roller 13 to the moving rail indicated by the solid line in the figure.
Moved along the trace R1 (or the dotted dotted locus R2).
The bending roller 13A and the receiving projection 14 at the final stop position.
The protruding piece 7 is interposed therebetween and bent to form a primary molded body 8.
The whole number of the protruding pieces 7 is simultaneously formed into the bent piece 5. Soshi
The grating that has been formed by this bending process
Line 1 is lined off from the automatic molding machine and is continuously fed
Molded.

In the above-mentioned automatic molding process, the gray
Bearing bar 1 at both ends of the teaching 1 ((C) in FIG. 1)
), The bending of one protruding piece 7 becomes unnecessary, and
Since the first half of the length is the useless portion 2B,
The long part is the first processing station 20 or the second processing station.
In any one of the options 21 or
Intermediate between work stations 20 and 21, or second processing stay
After the line is turned off from
It is removed by dynamic cutting and manual cutting. And the above
The bending process of the protruding piece 7 by the bending die may be bent as necessary.
Point 6 is electrically heated locally and hot bending is performed.
It is.

The gray of the embodiment shown in FIGS.
According to the first forming method, the side play of the conventional structure
Complicated welding process to make welding unnecessary
・ Welding inspection is unnecessary, and the forming process of grating is extremely
And simplify and streamline. Then, as in the above embodiment,
A series of molding processes from material supply to required shape molding
It can be connected and automated, and the conventional molding method
Compared with, the molding productivity of grating is particularly improved.

Each bearing bar 2 has both ends.
It has a shape bent approximately 90 ° in the opposite direction, and its bent piece
5 is placed on the grating mounting shelf at the top of the groove.
To carry the weight of the vehicle passing through the upper surface of the grating.
As it is an int, it has good sitting
The bearing stabilizes while maintaining the vehicle weight and its posture.
Since the bar 2 group has the above-mentioned mutual connection structure,
The entire group of Gubah functions as a cooperative body as a whole,
Withstands the above load and performs well as a grating function
can do.

The method of forming a grating according to the present invention
Is not limited to the above embodiment, but is
And the bent piece 5 into the bearing bar 2 bent in the same direction.
Or primary bending for bending the bent piece 5
Varying such that the independent process separate from the previous step of forming the body 8
In addition, the length of the bent piece 5 is shortened to
In some cases, the shape may be non-joined with the ringing bar 2.

[0021]

As described above, the grating of the present invention is
The method of forming the ring eliminates the need for the conventional side plate.
The complicated process of welding the side plate is omitted
Can simplify the grating forming process.
From the material supply to the grating forming of the predetermined shape,
It is possible to make the machining process continuous and automated,
In particular, the molding productivity of the ring is improved.

Then, high quality welding performance is required and
The welding process, which must be performed under bell management,
Converted to mechanical bending, so quality stability in processing
To provide mass production of high-quality, low-cost gratings
Can be There are the above effects.

[Brief description of the drawings]

FIG. 1 shows a grating according to an embodiment of the present invention and a forming method thereof, (A) is a perspective view of the grating, (B) is a partial perspective view of the grating, and (C) is a procedure of the forming method.
Top view showing construction method

FIG. 2 shows a method of bending a protruding piece in the grating forming method of the present invention, wherein (A) is a plan view showing the method, and (B) and (C) are side views of the curve forming.

FIG. 3 is a plan view of a grating according to another embodiment of the present invention.

FIG. 4 shows a conventional grating and a molding method thereof,
(A) is a perspective view of the grating, (B) is an explanatory view of the procedure and method of the molding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grating 2 Bearing bar 3 Connecting bar 4 Side plate 5 Curved piece 6 Bending point 7 Projection piece 8 Primary molded body 9 Bearing bar material 13 Bending roller 14 Receiving projection 15 Mold base 16 Receiving die for bending 17 Pressing die for bending Reference Signs List 20 First processing station 21 Second processing station R1 ・ R2 Movement locus of bending roller L Distance between bearing bars S Projection span

Claims (1)

(57) [Claims] 1. A grid consisting of bearing bars arranged side by side at predetermined intervals with the band width direction of the band being vertical, and a slight length of both end portions of the bearing bar is bent in the direction of the adjacent bearing bar. In forming a grating having a structure for forming an edge frame of the lattice by the bent piece and the bearing bars at both ends of the side by side, the long bearing bar members are arranged at a required pitch. In the first processing station, a connection bar cut to a predetermined size is supplied to the bearing bar material and fixed by welding, and then, the connection position is fixed by the connection bar. The bearing bar material thus obtained is cut into a predetermined length to form a primary molded body of a lattice body in which both ends of the bearing bar are formed as tongue-shaped projecting pieces. And progressive in the engineering station, the movement trajectory
The total number of the protruding pieces is controlled by bending rollers
At the same time, bending processing is performed to form the bending piece,
Molding method grating, characterized in that successive and automatically molding the ring.