Steel plate bending device and steel plate bending method

Abstract

To solve the problem in which: variation of process tolerance is suppressed regardless of an operator to manufacture a product having uniformity of quality.SOLUTION: A bending device (100) of a steel plate comprises: a first roller (1) which contacts with one surface of the steel plate (P); a second roller (2) which contacts with the other surface of the steel plate and reciprocally moves in a direction of approaching and leaving from the first roller; and an operation part (3) which adjusts moving amount of the second roller according to rotation amount. The operation part has a reference mark (4) to be positioned with a reference position where bending process is started by the second roller.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a steel plate bending apparatus and a steel plate bending method for bending steel plates such as guardrail beams. [Background technology]

[0002] Conventionally, bending devices for bending steel plates and steel pipes are known (see, for example, Patent Document 1). For example, a bending device for steel pipes performs bending by pressing, in which the steel pipe is supported on a die, its middle part is pressed by a punch to locally bend it, and the pipe is moved in the axial direction and bent in the same manner, thereby bending the pipe to the required length. Here, the degree of pressure applied by the punch is often determined by the sense of a skilled worker. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-279745 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the process relies on the worker's sense, it is difficult to manufacture products with uniform quality because the bending accuracy varies depending on the worker. Also, if the worker's skill is insufficient, adjustments and inspections after the adjustments are required after the bending process, which reduces product productivity.

[0005] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a technology that can reduce variations in processing accuracy and produce products of uniform quality regardless of the worker. [Means for solving the problem]

[0006] In order to solve the above problems, an aspect of the present invention is a steel plate bending device comprising a first roller that contacts one side of a steel plate, a second roller that contacts the other side of the steel plate and is freely movable back and forth in a direction approaching and moving away from the first roller, and an operating unit that adjusts the amount of movement of the second roller depending on the amount of rotation, and is characterized in that the operating unit has a reference mark that aligns the second roller to a reference position for starting bending.

[0007] It is also preferable that the actuator further comprises a guide portion that is fixed independently of the operation portion and indicates the position of the reference mark when the second roller is aligned with the reference position.

[0008] It is also preferable that the roller mechanism includes a housing portion that houses the first roller and the second roller, and the guide portion is fixed to the housing portion.

[0009] It is also preferable that the operation portion includes at least one step mark provided at each predetermined rotation amount along the rotation direction from the reference mark.

[0010] It is also preferable that the operation portion includes a plurality of the reference marks, and at least one step mark is provided for each of the reference marks and is provided at each different rotation amount along the rotation direction.

[0011] In order to solve the above problems, an aspect of the present invention is a method for bending a steel plate using the above-mentioned steel plate bending apparatus, characterized in having a reference positioning step of rotating the operating unit to move the reference mark to a predetermined position and aligning the second roller with a reference position for starting bending, and a bending step of passing the steel plate between the first roller and the second roller to bend it.

[0012] In order to solve the above problems, an aspect of the present invention is a method for bending a steel plate using the above-mentioned steel plate bending apparatus, comprising a reference positioning step of rotating the operating unit to move the reference mark to a predetermined position and aligning the second roller to a reference position for starting bending, a bending step of passing the steel plate between the first roller and the second roller to bend it, a process positioning step of moving the process mark to the predetermined position after the bending step, and a second bending step of passing the steel plate between the first roller and the second roller after the process positioning step, wherein the process positioning step and the second bending step are performed at least once. Effect of the Invention

[0013] According to the aspects of the present invention, it is possible to reduce variation in processing accuracy and manufacture products of uniform quality, regardless of the worker. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view of a steel plate bending device. [Diagram 2] 1 is a diagram illustrating a mechanism of bending by a steel plate bending device. FIG. [Diagram 3] FIG. 4A is a diagram illustrating the state of the operating part when the second roller is aligned to a reference position, and FIG. 4B is a diagram illustrating bending of a steel plate performed in the state of FIG. [Figure 4] FIG. 1A is a diagram explaining the state of the operating part when the second roller is aligned from the reference position to the second bending position, and FIG. 1B is a diagram explaining the bending of the steel plate performed in the state of FIG. [Diagram 5] FIG. 1A is a diagram explaining the state of the operating part when the second roller is aligned from the second bending position to the third bending position, and FIG. 1B is a diagram explaining the bending of a steel plate performed in the state of FIG. 1A. [Figure 6]FIG. 1(a) is a diagram explaining the state of the operating part when the second roller is aligned from the third bending position to the fourth bending position, and FIG. 1(b) is a diagram explaining the bending of a steel plate performed in the state of FIG. 1(a). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Note that the embodiments described below are merely examples, and various embodiments are possible within the scope of the present invention.

[0016] <Structure of steel plate bending equipment> As shown in Figs. 1 to 3, a steel plate bending apparatus (hereinafter referred to as bending apparatus) 100 bends a straight beam to form a curved guardrail beam, for example. The bending apparatus 100 includes a first roller 1, a second roller 2, an operation unit 3, a guide unit 6, and a housing unit .

[0017] The first roller 1 comes into contact with one surface (lower surface) of the transported steel plate (beam) P, and sandwiches the steel plate P between the second roller 2 and performs bending processing. The first roller 1 is housed in a housing unit 7 and is fixed in position. Two first rollers 1 are provided along the transport direction of the steel plate P, and are freely rotatable around an axis by a drive unit such as a motor.

[0018] The second roller 2 comes into contact with the other surface (upper surface) of the transported steel plate (beam) P, and sandwiches the steel plate P between the first roller 1 and performs bending processing. The second roller 2 is housed in the housing unit 7, and is provided so as to be able to move back and forth in a direction approaching and separating from the first roller 1. Specifically, the second roller 2 is provided so as to move toward and away from the first roller 1 from above the first roller 1 toward the space between the two first rollers 1. One second roller 2 is provided above the first roller 1, and is rotatable about its axis by a drive unit such as a motor. The second roller 2 moves back and forth in a direction approaching and separating from the first roller 1 by operating the operation unit 3.

[0019] The operating unit 3 is, for example, composed of a handle that rotates around an axis. The operating unit 3 is rotatably screwed to an axis 8 that extends in a direction approaching and moving away from the first roller 1, i.e., in the up-down direction. When the operating unit 3 is rotated in one direction (clockwise), it descends together with the second roller 2 so as to approach the first roller 1, and when the operating unit 3 is rotated in the other direction (counterclockwise), it ascends together with the second roller 2 so as to move away from the first roller 1. Therefore, the operating unit 3 can adjust the amount of movement (up-down movement) of the second roller 2 according to the amount of rotation.

[0020] The operation unit 3 includes a reference mark 4 and a process mark 5 . The reference mark 4 is used to align the second roller 2 to a reference position for starting bending of the steel sheet P. The reference mark 4 is formed integrally with the gripping portion 3a of the operation unit 3, and is provided on the surface of the cylindrical portion 3b which shares the rotation axis of the operation unit 3. The reference mark 4 is, for example, a linear mark marked along the rotation axis direction on the surface of the cylindrical portion 3b. The reference mark 4 is given a color different from the color of the surface of the cylindrical portion 3b so that it is easily visible. A plurality of reference marks 4 are provided on the cylindrical portion 3b. The reference marks 4a, 4b are arranged along the axial direction of the cylindrical portion 3b, and the positions at which they are provided vary depending on the curvature of the steel sheet P to be finally obtained.

[0021] The process mark 5 is used to align the second roller 2 to a position for performing the second or subsequent bending operations when bending the steel sheet P multiple times. The process mark 5 is provided on the surface of the cylindrical portion 3b. The process mark 5 is, for example, a linear mark marked on the surface of the cylindrical portion 3b along the direction of the rotation axis. The process mark 5 is given a color different from the color of the surface of the cylindrical portion 3b so that it is easy to see. Here, when there are multiple process marks 5, horizontal lines intersecting the linear marks are added to each process mark 5, and the number of horizontal lines differs for each process mark 5. A plurality of process marks 5 are provided on the cylindrical portion 3b corresponding to each of the reference marks 4. Each process mark 5 is provided at a predetermined rotation distance from the corresponding reference mark 4 along the rotation direction of the operating portion 3, and the positions (intervals) at which the process marks 5 are provided vary depending on the extent to which the steel sheet P is to be bent in each process. That is, the process marks 5Aa, 5Ab, ... corresponding to the reference mark 4a and the process marks 5Ba, 5Bb, ... corresponding to the reference mark 4b are provided at different intervals from each other.

[0022] The guide portion 6 is fixed independently of the operation portion 3, and indicates the position of the reference mark 4 when the second roller 2 is aligned to the reference position. The guide portion 6 also indicates the position of not only the reference mark 4 but also the process mark 5. The guide portion 6 is formed so that its tip is sharp, and its base end is fixed to the housing portion 7. The second roller 2 can be aligned by aligning the reference mark 4 and the process mark 5 provided on the operation portion 3 with the tip of the guide portion 6. In other words, when the reference mark 4 and the process mark 5 are aligned with the tip of the guide portion 6, the second roller 2 is in a position where the steel sheet P can be bent.

[0023] The housing 7 is a protective case that houses at least the first roller 1 and the second roller 2. A through hole 7a is formed in the upper surface of the housing 7, and the operation unit 3 connected to the second roller 2 protrudes from this through hole 7a to the outside of the housing 7. A guide unit 6 is fixed near the edge of the through hole 7a.

[0024] <Steel plate bending method> Next, a method for bending a steel plate using the bending apparatus 100 will be described. In order to obtain a steel plate P with a predetermined curvature, bending is performed stepwise in several steps, which results in a stable product with less twisting and residual stress, and also allows the bending apparatus to be made smaller. Below, an example will be described in which the final curvature of the steel plate P is obtained by performing bending four times. When bending the steel sheet P, as shown in FIG. 3, the worker holds the gripping portion 3a of the operating unit 3 and rotates the operating unit 3 to move the reference mark 4a(4) used for bending to a position opposite the tip of the guide portion 6, thereby aligning the second roller 2 to the reference position for starting the bending process. Next, the steel sheet P is passed through the inside of the housing 7, that is, between the first roller 1 and the second roller 2, and the steel sheet P is subjected to a first bending process.

[0025] After performing the first bending process, as shown in FIG. 4, the worker grasps the gripping portion 3a of the operating unit 3 and rotates the operating unit 3 to move the process mark 5Aa(5) adjacent to the reference mark 4 to a position opposite the tip of the guide portion 6, thereby aligning the second roller 2 to a position to start the second bending process. Next, the steel sheet P is passed inside the housing 7, i.e., between the first roller 1 and the second roller 2, and a second bending process is applied to the steel sheet P. At this time, since the steel sheet P has already passed between the first roller 1 and the second roller 2 in the first bending process step, the steel sheet P is passed between the first roller 1 and the second roller 2 from the opposite side to the first bending process (the right side on the paper surface of FIG. 4) and a second bending process is applied to the steel sheet P.

[0026] After performing the second bending process, as shown in FIG. 5, the worker grasps the gripping portion 3a of the operating unit 3 and rotates the operating unit 3 to move the process mark 5Ab(5) adjacent to the process mark 5Aa used in the second bending process to a position opposite the tip of the guide portion 6, thereby aligning the second roller 2 to a position to start the third bending process. Next, the steel sheet P is passed inside the housing 7, i.e., between the first roller 1 and the second roller 2, and a third bending process is performed on the steel sheet P. At this time, the steel sheet P is passed between the first roller 1 and the second roller 2 from the opposite side to the second bending process (the left side on the paper surface of FIG. 5), and the third bending process is performed on the steel sheet P.

[0027] After performing the third bending process, as shown in FIG. 6, the worker grasps the gripping portion 3a of the operating unit 3 and rotates the operating unit 3 to move the process mark 5Ac(5) adjacent to the process mark 5Ab used in the third bending process to a position opposite the tip of the guide unit 6, thereby aligning the second roller 2 to a position to start the fourth bending process. Next, the steel sheet P is passed inside the housing 7, i.e., between the first roller 1 and the second roller 2, and the fourth bending process is performed on the steel sheet P. At this time, the steel sheet P is passed between the first roller 1 and the second roller 2 from the opposite side to the third bending process (the right side on the paper surface of FIG. 6), and the fourth bending process is performed on the steel sheet P. As a result, the steel sheet P has the curvature that is finally desired. In addition, by rotating the operating unit 3 to move the reference mark 4b(4) used for bending to a position opposite the tip of the guide unit 6, and aligning the second roller 2 with the reference position for starting the bending process, the steel plate P can be bent with a curvature different from that of the bending process described above.

[0028] As described above, when bending the steel sheet P using the bending device 100, the worker only needs to align the reference mark 4 with the guide unit 6 and then pass the steel sheet P between the first roller 1 and the second roller 2, so that the steel sheet P can be bent with the same curvature regardless of the worker's level of skill. Therefore, unlike the conventional method, there is no dependency on the worker's sense, and there is no variation in bending accuracy depending on the worker, so that products with uniform quality (e.g., guardrail beams) can be manufactured. Furthermore, even if the worker's level of skill is insufficient, there is no need for touch-up work after bending or inspection after touch-up work, and there is no decrease in product productivity. Furthermore, when aligning the second roller 2 using the operating unit 3, it is only necessary to align the reference mark 4 and the process mark 5 so that they face the tip of the guide unit 6, so that the alignment work for the second roller 2 can be performed easily. Moreover, since the guide portion 6 is provided on the housing portion 7, the guide portion 6 can be easily attached. Furthermore, since the reference mark 4 and the process mark 5 are arranged side by side along the rotation direction of the operation unit 3, alignment with the guide unit 6 can be easily achieved by simply rotating the operation unit 3. Furthermore, even when performing multiple types of bending processes, by arranging multiple reference marks 4 and process marks 5 corresponding to each reference mark 4 in a line along the axial direction of the operating unit 3 (the direction in which the operating unit 3 moves back and forth), multiple types of bending processes can be flexibly handled.

[0029] <Other> Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and includes all aspects included in the concept of the present invention and the scope of the claims. In addition, each configuration may be appropriately and selectively combined so as to achieve at least a part of the above-mentioned problems and effects. In addition, for example, the shape, material, arrangement, size, etc. of each component in the above embodiments may be appropriately changed depending on the specific usage mode of the present invention. For example, at least one reference mark 4 is sufficient, and when there are many types of bending, that is, when performing multiple types of bending with different curvatures, it is advisable to provide the same number of reference marks 4 as the types of bending. Furthermore, if the bending process is performed only once, then only the reference mark 4 is required and therefore the process mark 5 is not necessary, and multiple marks can be provided according to the number of bending processes. Furthermore, the reference mark 4 and the process mark 5 are not limited to being provided on the cylindrical portion 3b, but may be provided on other portions of the operation portion 3 as long as they rotate together with the operation portion 3. Further, the guide portion 6 need not necessarily be newly provided, but may be a portion already provided in the bending apparatus 100, for example, a portion of the housing portion 7, which may serve as the guide portion. [Explanation of symbols]

[0030] 1. First Roller 2. Second Roller 3 Control section 3a Gripping part 3b Cylindrical part 4 Reference Marks 5 Process mark 6 Guide section 7 Housing 7a Through hole 8 Shaft P steel plate 100 Steel plate bending equipment

Claims

1. A steel plate bending apparatus, comprising: A first roller that contacts one surface of the steel plate; a second roller that is in contact with the other surface of the steel plate and is reciprocally movable in a direction approaching and separating from the first roller; an operation unit that adjusts the amount of movement of the second roller in accordance with the amount of rotation of the second roller; the operation unit includes a plurality of reference marks for aligning the second roller to a reference position for starting bending, and at least one process mark provided for each of the reference marks and provided at different rotation amounts along a rotation direction, the plurality of reference marks and the process marks corresponding to each of the reference marks are arranged side by side along an axial direction of the operation unit, A steel plate bending device comprising a guide unit that is fixed independently of the operation unit and indicates the positions of the reference mark and the process mark.

2. a housing portion that houses the first roller and the second roller, The steel plate bending device according to claim 1 , wherein the guide portion is fixed to the housing portion.

3. A method for bending a steel plate using the steel plate bending apparatus according to claim 1 or 2, a reference positioning step of rotating the operation unit to move the reference mark to a predetermined position and aligning the second roller to a reference position for starting bending; a bending step of passing the steel plate between the first roller and the second roller and bending the steel plate; A method for bending a steel plate, comprising the steps of:

4. A method for bending a steel plate using the steel plate bending apparatus according to claim 1 or 2, a reference positioning step of rotating the operation unit to move the reference mark to a predetermined position and aligning the second roller to a reference position for starting bending; A bending process in which the steel sheet is passed between the first roller and the second roller and subjected to bending. Steps and a process alignment step of moving the process mark to the predetermined position after the bending process; A second bending step of bending the steel sheet by passing it between the first roller and the second roller after the process alignment step, A method for bending a steel plate, comprising performing the process positioning step and the second bending step at least once.

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