JPH09239455A - Cold roll forming method of metal hoop - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold roll forming method for effectively and inexpensively producing a grating material of a walker grating whose non-slip face is hardly produced by hot forming and whose production lot is small. SOLUTION: A metal hoop material 2 is transferred forcibly to one side direction, a recess-marked part 21 is formed on the side edge part 20 of the metal hoop material 2 with four numbers of rolls 11 to 14 installed on the way. Three among four numbers of rolls 11 to 14 are pressing rolls 11, 12, 13, the upper and lower main face walls 19, 19 of the metal hoop material 2 and one side edge wall 20 are pressed and held. The rest one of mark impressing roll 14 is provide with a mark impressing teeth 22. This mark impressing roll 14 is pressed on the other side edge face 20 of the metal hoop material 2, a recess impressing part 21 is formed continuously under the normal temperature on the side edge face 20 of the metal hoop material 2. When the recess- marked part 21 exhibits non-slip effect as the grating material of the grating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold roll forming method for making a side end surface of a metal hoop material uneven. The metal hoop material obtained by this molding method is used, for example, as a grid material for grating laid in the gutter of a road, and exhibits an anti-slip action by the uneven surface.

[0002]

2. Description of the Related Art As a grid material for grating, a metal hoop material having a rectangular or I-shaped cross section is often used, and if necessary, a concave surface or a projection for preventing slippage is formed on the tread side of the grid material. This type of grid material is roughly classified into a heavy load for vehicles such as a heavy load, and a light load for which a load target is limited to a pedestrian or the like. The demand for grid materials for heavy loads continues to increase with the expansion of roads and transportation facilities, and since the production lot is large, it will be integrated by hot working. An example can be found in Japanese Examined Patent Publication No. 3-44841.

[0003]

The grid material for light load is
Demand is extremely low compared to grid materials for heavy loads, and production lots are small. Therefore, if the unevenness for slip prevention is formed by hot working, it will break into profitability. There are some grid materials in which the metal hoop material is subjected to cutting or pressing to form irregularities for slip prevention, but these have low production efficiency and cannot sufficiently reduce the manufacturing cost of the grid material. Therefore, most of the gratings for pedestrians are made of an inexpensive lattice material without slip prevention on the tread surface, and there is room for improvement in that it is difficult to secure sufficient safety.

An object of the present invention is to make a side surface of a metal hoop material cold-rolled so that an uneven surface can be formed. Even when the production lot is small, the side surface of the metal hoop has an uneven surface. It is an object of the present invention to provide a cold roll forming method for a metal hoop material, which can efficiently produce the material and can sufficiently reduce the production cost. An object of the present invention is to provide a cold roll forming method for a metal hoop material, which can inexpensively manufacture a pedestrian grating having unevenness for preventing slippage on a tread surface.

[0005]

According to the cold roll forming method of the present invention, a metal hoop material 2 having a pair of main wall surfaces 19 opposed to each other in the thickness direction and a pair of side end surfaces 20 opposed to each other in the width direction is provided. It is forcibly conveyed in one direction, and the recessed portion 21 is formed on the side end surface 20 by the roll forming machine 9 provided in the middle of the conveying path. The roll forming machine 9 has three pressing rolls 11, 12, and 13 for pressing the pair of main wall surfaces 19 and 19 and one side end surface 20 of the metal hoop material 2, respectively, and engraving teeth 22 on the peripheral surface. And the other side end surface 2 of the metal hoop material 2
And a stamp roll 14 that presses 0 to form the recessed portion 21. A pair of pressing rolls 1 for pressing the main wall surface 19
Each of the rolls 11 and 12 has a gap E between the 1 and 12 and the stamping roll 14 that allows the metal hoop material 2 to be pressed and deformed.
・ The rotation center axes of 12, 13, and 14 are located on the same plane. Therefore, the cross-section outline of the metal hoop material 2 is set to each roll 11-
Simultaneously pressing with 14 forms a recess 21 on the side end surface 20 of the metal hoop material 2.

Specifically, the metal hoop material 2 is forcibly conveyed in one direction by the pulling machine 4 arranged at the next stage of the roll forming machine 9. However, the pressure rolls 11, 12, and 13 and the stamp roll 1
The metal hoop material 2 may be forcibly conveyed in one direction by rotationally driving each of them. Each roll 11, 12, 13, 1
The roll center plane P passing through the rotation center axis of 4 is inclined by a predetermined angle θ with respect to a reference plane R orthogonal to the transport direction of the metal hoop material 2 as shown in FIG.
The metal hoop material 2 rather than the pressing roll 13 facing it.
The recessed portion 21 is formed in a state where the side end surface 20 is pressed on the lower side in the conveyance direction of.

[0007]

The metal hoop material 2 passes through the roll forming machine 9 while the three pressing rolls 11, 12, 13 and the stamping roll 14 are used.
And are pressed at the same time. In other words, the pair of pressing rolls 11 and 12 for pressing the main wall surface 19 and the one side end surface 20.
The metal hoop material 2 is pressed and held by the pressing roll 13 that presses, and in this state, the stamping roll 14 is pressed against the other side end surface 20 to form the recessed portion 21. In order to allow the flow of the meat wall that is pushed away by the stamping teeth 22 as the recessed portion 21 is formed and to facilitate the molding of the recessed portion 21, the pair of pressing rolls 1
A gap E of a predetermined amount is provided between the 1 and 12 and the stamp roll 14.

Thus, the three pressing rolls 11 and 12
According to the molding method in which the concave engraved portion 21 is formed on the side end surface 20 of the metal hoop material 2 by the 13 and the stamping roll 14, the metal hoop material 2 is conveyed at a constant speed, and the side end surface 20 has an uneven surface. Can be continuously formed at room temperature. 4 rolls 1
Since the metal hoop material 2 is simply passed through the roll forming machine 9 equipped with 1 to 14, it is possible to simplify the equipment required for the uneven surface treatment of the metal hoop material 2 as compared with the case of performing cutting or pressing. In the case of the existing hoop material shaping line equipped with the drawing machine 4, it is possible to easily prepare the metal hoop material 2 having the side end surface 20 made uneven by simply disposing the roll forming machine 9 in the preceding stage of the drawing machine 4. Can be molded.

Depending on the composition and hardness of the metal hoop material 2, and the depth and shape of the recessed portion 21, the processed metal hoop material 2 that has passed through the roll forming machine 9 is recessed with the stamping roll 14 as the base end. There is a tendency for the carved portion 21 side to be curved and deformed in an arc shape. In order to correct this curving tendency and send the processed metal hoop material 2 in a substantially linear shape, the roll center plane P of the roll forming machine 9 is set to a reference plane R orthogonal to the transport direction of the metal hoop material 2. On the other hand, it is inclined by a predetermined angle θ.

[0010]

1 to 5 show an embodiment of a cold roll forming method for a metal hoop material according to the present invention, and particularly show a case where cold forming is performed using an existing hoop material shaping line. . In the hoop material shaping line shown in FIG. 2, reference numeral 1 is an uncoiler, 2 is a metal hoop material derived from the uncoiler 1, and 3 is a recoiler provided at the end of the line. The metal hoop material 2 has a thickness of 2 to 4.5 mm and a width dimension of 1
It is made of a steel material having a rectangular section of 0 to 50 mm or an I-shaped section. Since the metal hoop material 2 in this embodiment is used as a light-duty type grating grid material for pedestrians,
The SS material (rolled steel material for general structure), SPHC material (hot rolled mild steel sheet), stainless steel material, or the like is used as the material for forming the metal hoop material 2.

The metal hoop material 2 is forcibly conveyed by a pulling machine 4 arranged in front of the recoiler 3 and moves in the arrow direction at a constant speed. Between the extractor 4 and the uncoiler 1, the first to fourth shaping rolls 5, 6, 7,
8 are arranged, and while passing through these roll groups 5 to 8, the cross-sectional dimension and cross-sectional shape of the metal hoop material 2 are adjusted, or a shaping process such as chamfering of a corner is performed. Each of the shaping rolls 5 to 8 is composed of a pair of horizontal rolls that sandwich the metal hoop material 2 up and down, or a pair of vertical rolls that sandwich the metal hoop material 2 front and back, and the number of stages of the rolls depends on the shaping purpose. And the combination can be changed freely.
The above is the existing hoop material shaping line.

The roll forming machine 9 according to the present invention is arranged between the shaping roller 8 at the last stage and the drawing machine 4 to make the side end surface 20 of the metal hoop material 2 uneven. As shown in FIG. 4, the roll forming machine 9 includes a total of four rolls 11, 12, 13 and 14 each in a vertical and horizontal pair, four bearing blocks 15 that support these rolls freely, and a bearing block 15. It is composed of a disc-shaped frame 16 and a mounting base 17 that support the same. The material of the rolls 11, 12, 13, and 14 is SKD material (die steel) or cemented carbide material.

Of the four rolls 11 to 14, the pressing rolls 11 and 12 that are vertically opposed to each other are a pair of main wall surfaces 19 and 1 that are opposed to each other in the thickness direction of the metal hoop material 2 as shown in FIG.
Press 9. The pressing roll 13 and the stamping roll 14 that are opposed to each other on the left and right press the pair of side end faces 20 and 20 that oppose each other in the width direction of the metal hoop material 2. In other words, the upper and lower surfaces and one side surface of the metal hoop material 2 are pressed and held by the three pressing rolls 11 to 13, and the stamping roller 14 is pressed to the other one side surface that remains to form a V-groove-shaped recess on the side end surface 20. The carved part 21 is formed.

The width dimensions of the upper and lower pressing rolls 11 and 12 are set smaller than the width dimension of the metal hoop material 2. The thickness of the remaining pressing roll 13 and the stamping roll 14 is sufficiently larger than the thickness of the metal hoop material 2 and is set to 25 to 30 mm. The engraving roll 14 is formed in the shape of a claw gear, and triangular engraving teeth 22 are provided on its peripheral surface at a constant pitch.
While the shaping roll groups 5 to 8 described above are arranged alternately in the vertical and horizontal directions, the pressing rolls 11 to 13 and the stamping roll 14 have their respective rotation center axes on the same vertical plane. Are arranged in such a manner that the rolls 11 to 14 are arranged on the outline of the metal hoop material 2 passing through the rolls 11 to 14, respectively.
The pressing force of is applied at the same time. Further, a gap E is formed between the upper and lower pressing rolls 11 and 12 and the stamping roll 14 to allow pressing deformation in the thickness direction and inward of the metal hoop material 2.
Is provided to allow the flow of the meat wall pressed by the stamping teeth 22 to facilitate the molding.

In FIG. 3, the pulling machine 4 has drums 23 and 24 which are rotationally driven in the same direction, and has spiral grooves 25 on the peripheral surfaces thereof. The metal hoop material 2 is wound several times along the spiral groove 25 of the one drum 23 and the other drum 24, and is then delivered to the recoiler 3 via the rear drum 24. By transmitting the rotational force of both drums 23 and 24 to the metal hoop material 2 wound along the spiral groove 25, the metal hoop material 2 can be forcibly conveyed with a strong force.

When the metal hoop material 2 passes through the roll forming machine 9, depending on the composition and hardness of the metal hoop material 2 or the depth and shape of the recessed portion 21, the metal hoop material is shown by an imaginary line in FIG. The material 2 may be curved and deformed in an arc shape with the stamp roll 14 as the base end. In order to correct such a curving tendency and send the processed metal hoop material 2 from the roll forming machine 9 in a substantially linear state, the roll forming machine 9 is arranged in a state of being inclined with respect to the conveying direction of the metal hoop material 2. .

More specifically, as shown in FIG. 3, a roll center plane P passing through the rotation center axes of the rolls 11 to 14 of the roll forming machine 9 is assumed, and this is a reference plane R orthogonal to the transport direction of the metal hoop material 2. The roll forming machine 9 is arranged so as to be inclined at a predetermined angle θ with respect to the mounting base 17 and the mounting base 17 is fixed to the roll bed. As a result, the stamping teeth 22 of the stamping roll 14 press the side end face 20 on the lower side in the transport direction of the metal hoop material 2 than the circumferential surface of the pressing roll 13 which faces the stamping roll 13. Therefore, the metal hoop material 2 simultaneously receives a bending tendency force due to the concave engraved portion 21 being formed only on one side and a tendency force to be pressed toward the pressing roll 13 by the engraving teeth 22, and both tending force are exerted. The metal hoop material 2 in a substantially straight state can be delivered by arranging the row forming machine 9 so as to be balanced.

The inclination angle θ of the roll center plane P is 10
Practical use is within a range of -30 degrees. Line speed is
Depending on the cross-sectional area, hardness, etc. of the metal hoop material 2, 1
It is in the range of 0 to 50 m / min.

The metal hoop material 2 obtained on the hoop material shaping line is adjusted in shape by a leveler and then cut to a fixed length before shipment. By using this standard length material, as shown in FIG. 5, the grid material 26 having the engraved portion 21 on the tread surface 27 side is provided.
You can configure grating with. Since the concave engraved portion 21 is formed by the rotating engraved teeth 22, no burr (thin overhang) is generated at the boundary with the tread surface 27. The tread 27 swells during roll forming and is slightly curved in the thickness direction. Therefore, in the state of finishing as the grating, the stamped portion 21 can exert a sufficient anti-slip action without causing excessive catching.

In addition to the above embodiments, the pressure rolls 11 to 13 and the stamping roll 14 of the roll forming machine 9 can be rotationally driven to roll-form while forcibly conveying the metal hoop material 2. In this case, The pulling machine 4 can be omitted, and can be used together. The engraving teeth 22 can be changed to a saw blade shape, a trapezoidal shape, a pyramid shape, or the like, and the adjacent pitch can be set to an indefinite pitch if necessary. The metal hoop material of the present invention can be used as a general-purpose steel material other than the grating material for grating.

[0021]

According to the present invention, three pressing rolls 11 to 1 are used.
3 and one stamping roll 14 simultaneously press the metal hoop material 2, and while the metal hoop material 2 passes through the rolls 11 to 14, a stamped portion 21 is formed on the side end surface 20 thereof. No. 20 was made to be able to continuously have an uneven surface while maintaining a constant transport speed at room temperature. Therefore, even if the production lot of this type of metal hoop material 2 is small, the metal hoop material 2 having the uneven surface on the side end surface 20 can be efficiently produced, and the cost required for the production can be sufficiently reduced. By using the obtained metal hoop material 2 as a grid material for grating, the recessed portion 21 for preventing slippage is formed on the tread surface 27.
It is possible to inexpensively manufacture a pedestrian grating equipped with, and to enhance safety during walking by strengthening the anti-skid function of the grating.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the principle of a roll forming method.

FIG. 2 is a schematic front view of a hoop material shaping line.

FIG. 3 is a schematic plan view of a roll forming machine and a drawing machine.

FIG. 4 is a side view of the roll forming machine as viewed from the outlet side of the metal hoop material.

FIG. 5 is a perspective view of a molded metal hoop material.

[Explanation of symbols]

 2 Metal hoop material 11 Pressing roll 12 Pressing roll 13 Pressing roll 14 Stamping roll 19 Main wall surface 20 Side end face 21 Recessed part 22 Stamped tooth E Gap

Claims (4)

[Claims] 1. A pair of main wall surfaces 19 facing each other in the thickness direction.
And the pair of side end faces 20 facing each other in the width direction, the metal hoop material 2 is forcibly conveyed in one direction, and the side end face 20 is recessed by the roll forming machine 9 provided in the middle of the conveying path. In the cold roll forming method, the roll forming machine 9 comprises a pair of main wall surfaces 19 of the metal hoop material 2.
.19 and one side end surface 20 of three pressing rolls 11, 12, and 13, respectively, and stamping teeth 22 on the peripheral surface, and presses the other side end surface 20 of the metal hoop material 2. The stamp roll 14 that forms the recessed portion 21 is provided, and a gap E that allows pressing deformation of the metal hoop material 2 is provided between the stamp roll 14 and the pair of pressing rolls 11 and 12 that press the main wall surface 19. Each roll 11 ・ 12 ・ 13 while having
-The rotation center axis of 14 is located on the same surface, and the cross-sectional outline of the metal hoop material 2 is simultaneously pressed by each roll 11-14, and the recessed part 21 is formed in the side end surface 20 of the metal hoop material 2. A method for cold rolling a metal hoop material, which is characterized in that 2. The metal hoop material 2 is forcibly conveyed in one direction by a pulling machine 4 arranged at the next stage of the roll forming machine 9.
A method for cold rolling a metal hoop material as described. 3. The cold roll forming method for a metal hoop material according to claim 1, wherein the pressing rolls 11, 12, and 13 and the stamping roll 14 are rotationally driven to forcibly convey the metal hoop material 2 in one direction. 4. A roll center plane P passing through a rotation center axis of each roll 11, 12, 13, 14 is inclined at a predetermined angle θ with respect to a reference plane R orthogonal to the conveying direction of the metal hoop material 2. The metal according to claim 1, 2 or 3, wherein the stamping roll 14 forms the recessed portion 21 in a state of pressing the side end surface 20 on the lower side in the transport direction of the metal hoop material 2 than the pressing roll 13 facing the stamping roll 13. Cold roll forming method for hoop material.