Bending method
The described bending method for plate materials with protrusions addresses the need for custom molds by cutting and bending products with aligned protrusions, reducing time and costs while enhancing accuracy.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- AMADA CO LTD
- Filing Date
- 2024-12-20
- Publication Date
- 2026-07-02
Smart Images
Figure 2026109934000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a bending method.
Background Art
[0002] Conventionally, Patent Document 1 discloses a bending method for a plate material having protrusions. In the bending method disclosed in Patent Document 1, when there are protrusions on the plate material, a concave portion is provided at the bottom of the V-shaped groove of the die, and during the bending process, the plate material is arranged such that the protrusions face the concave portion so that the protrusions are accommodated in the concave portion.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] However, in the conventional bending method described above, since it is necessary to specially manufacture a die provided with a concave portion according to the protrusions of the plate material, there is a problem that the working time and cost increase.
Means for Solving the Problems
[0005] An aspect of one or more embodiments includes a cutting step of cutting out a plurality of products of the same shape from a workpiece having a plurality of protrusions formed in a regular pattern on the surface, and a bending step of bending the plurality of products cut out in the cutting step along the same bending line, and in the cutting step, the plurality of products are cut out such that the shapes of the protrusions on the bending line are the same in the plurality of products.
Effects of the Invention
[0006] According to one or more embodiments of the bending method, even when bending a workpiece with protrusions formed on its surface, there is no need to manufacture a special mold, thus reducing working time and costs. [Brief explanation of the drawing]
[0007] [Figure 1] Figure 1 is a flowchart showing a bending method according to one embodiment. [Figure 2] Figure 2 shows an example of a product assigned to a workpiece during the cutting process of a bending method according to one embodiment of the present invention. [Figure 3] Figure 3 shows an example of a product that is bent using a bending method according to one embodiment of the present invention. [Figure 4] Figure 4 shows an example of a case in which shearing is performed in the cutting step of a bending method according to one embodiment. [Figure 5] Figure 5 is a diagram illustrating a bending process in which a V-groove die is used in the bending step of a bending method according to one embodiment. [Figure 6] Figure 6 is a diagram illustrating the bending process when a wing bend die is used in the bending step of a bending method according to one embodiment. [Figure 7] Figure 7 shows the relationship between the finished angle and the offset amount in the bending process of a bending method according to one embodiment. [Modes for carrying out the invention]
[0008] The bending method according to this embodiment will be described below with reference to the drawings. Figure 1 is a flowchart of the bending method according to this embodiment. As shown in Figure 1, the bending method according to this embodiment includes a cutting step S1 and a bending step S3, and is a method of cutting a product from a workpiece such as a checkered steel plate with protrusions formed on its surface, and then bending the product.
[0009] Cutting process S1 is a process of cutting out multiple products of the same shape from a workpiece in which multiple protrusions are formed in a regular pattern on the surface. For example, as shown in Figure 2, products P1 to P6 are assigned to the workpiece W, and products P1 to P6 are cut out from the workpiece W by blanking. In blanking, cutting may be done with a laser processing machine, or holes may be punched with a turret punch press. The workpiece W is, for example, a checkered steel plate as shown in Figure 3, in which a regular pattern of stripes is formed on the surface.
[0010] Products P1 to P6 each have the same shape and the same bending lines L1 and L2 are set for each. Among products P1 to P6, products P1 to P3, which are arranged in a direction parallel to the bending lines L1 and L2, have the bending lines L1 and L2 set parallel to the striped pattern formed on the workpiece W, and the bending lines L1 and L2 are set on the same straight line.
[0011] In other words, in the multiple products P1 to P3 cut from directions parallel to the bending lines L1 and L2, the bending lines L1 and L2 are set parallel to the striped pattern and on the same straight line. As a result, the shape of the protrusion on the bending line L1 shown in Figure 3 is the same for all of the products P1 to P3. Therefore, in the cutting process, the multiple products P1 to P3 are cut so that the shape of the protrusions on the bending lines L1 and L2 matches for all of the products P1 to P3. Similarly, products P4 to P6 are also cut so that the shape of the protrusions on the bending lines L1 and L2 matches.
[0012] On the other hand, in the multiple products P1 and P4 cut from directions perpendicular to the bend lines L1 and L2, the bend lines L1 and L2 are set at positions separated by a multiple of the width of the striped pattern. For example, the distance K between the bend line L1 of product P1 and the bend line L1 of product P4 shown in Figure 2 is set to a multiple of the width h of the striped pattern shown in Figure 3. Therefore, the distance between the end a1 of product P1 and the end a4 of product P4 is also K, and is set to a multiple of the width h of the striped pattern.
[0013] As a result, the shape of the protrusions on the bend line L1 shown in Figure 3 will be the same for both products P1 and P4, and the shape of the protrusion at end a1 of product P1 will be the same for the protrusion at end a4 of product P4. Therefore, in the cutting process, multiple products P1 and P4 are cut out so that the shapes of the protrusions on the bend lines L1 and L2 match for all of them. Similarly, products P2 and P5 and products P4 and P6 are cut out so that the shapes of the protrusions on the bend lines L1 and L2 match.
[0014] Although Figure 2 illustrates the case of cutting by blanking, it is also possible to cut by shearing using a shearing machine. When cutting by shearing, as shown in Figure 4, a large cut is made along the cutting line 41 in a direction parallel to the bending lines L1 and L2, and then individual products P are cut out along the cutting line 42 in a direction perpendicular to the bending lines L1 and L2.
[0015] Next, the bending process S3 is a process in which multiple products cut out in the cutting process S1 are bent along the same bending line. At this time, it is possible to perform the bending using a normal V-groove die, but it is preferable to perform the bending using a wing bend die.
[0016] A wing bend die uses two wing pieces to support both sides of the bend line with their surfaces, and the wing pieces rotate toward the bend line to perform the bending process. In other words, in bending process S3, both sides of the bend line are supported by the surface of the die, and the die rotates toward the bend line to perform the bending process. This reduces bending defects compared to using a V-groove die and improves bending accuracy.
[0017] For example, when performing bending of the bending line L1 using a V-groove die, as shown in FIG. 5, since the tip of the V-groove contacts the workpiece at the contact portion 51, bending marks may occur in this portion. On the other hand, when using a wing bend die, as shown in FIG. 6, since the wing piece contacts the workpiece in the contact region 61, the contact area can be increased. Therefore, bending marks can be reduced, and bending accuracy can be improved for workpieces with protrusions on the surface such as corrugated steel sheets.
[0018] Also, since the V-groove die contacts the workpiece linearly, the contact area is small, and the workpiece may shift during bending, resulting in a decrease in bending accuracy. However, in the case of the wing bend die, since the contact area is large, the workpiece is less likely to shift, and the bending accuracy is high.
[0019] Furthermore, in the bending of corrugated steel sheets, variations occur in the finished angle after bending depending on the position of the bending line in the pattern of the corrugation pattern. Therefore, it is necessary to correct the bending angle according to the position of the corrugation pattern.
[0020] First, in the corrugated steel sheet shown in FIG. 3, a pattern with a width h is repeatedly formed in a direction perpendicular to the bending line L1 from the reference position 31, and the bending line L1 is bent at the position of the offset amount F. The offset amount F is the distance from the reference position 31.
[0021] FIG. 7 is a diagram showing the finished angle at the position of the offset amount F when the bending angle is 90°. The value of the finished angle when F = 0 indicates the finished angle when the bending line L1 is at the reference position 31.
[0022] As shown in FIG. 7, even when bending is performed with a bending angle of 90°, variations occur in the finished angle according to the offset amount F. When F = 0, the finished angle is less than 90°, so further bending is required. On the other hand, when F = f1, the finished angle exceeds 90°, indicating over-bending.
[0023] Therefore, a correction amount for the bending angle is set in advance according to the offset amount F, and the bending process is performed by correcting the bending angle according to this correction amount. For example, when F=0, a correction amount that increases the bending angle is set in advance, and the bending process is performed by correcting the bending angle with this correction amount. Also, when F=f1, a correction amount that decreases the bending angle is set in advance, and the bending process is performed by correcting the bending angle with this correction amount.
[0024] In other words, a reference position 31 is set at a predetermined position in the striped pattern, and the bending angle during bending is corrected according to the offset amount F from the reference position 31. This makes it possible to improve the accuracy of bending even for workpieces with protrusions formed on the surface, such as checkered steel plates.
[0025] Thus, once a product is cut from a workpiece such as a checkered steel plate with protrusions formed on its surface, and the product is bent, the bending method according to this embodiment is completed.
[0026] [Effects of the Embodiment] As described in detail above, the bending method according to this embodiment includes a cutting step of cutting out multiple products of the same shape from a workpiece on which multiple protrusions are formed in a regular pattern on its surface, and a bending step of bending the multiple products cut out in the cutting step along the same bending line. In the cutting step, multiple products are cut out so that the shape of the protrusions on the bending line matches among the multiple products. As a result, even when bending a workpiece on which protrusions are formed on its surface, it is not necessary to manufacture a special mold, and working time and costs can be reduced. In addition, since the shape of the protrusions on the bending line matches among the multiple products, the accuracy of the bending process can be improved.
[0027] Furthermore, in the bending method according to this embodiment, the bending line is set to be parallel to and on the same straight line as the striped pattern in multiple products cut from a direction parallel to the bending line. This makes it possible to match the shape of the protrusions on the bending line in multiple products cut from a direction parallel to the bending line. Therefore, even when bending a workpiece with protrusions formed on its surface, there is no need to manufacture a special mold, which reduces working time and costs and improves the accuracy of the bending process.
[0028] Furthermore, in the bending method according to this embodiment, the bending lines are set at positions that are a multiple of the width of the stripe pattern for multiple products cut from a direction perpendicular to the bending line. This makes it possible to match the shape of the protrusions on the bending line for multiple products cut from a direction perpendicular to the bending line. Therefore, even when bending a workpiece with protrusions formed on its surface, there is no need to manufacture a special mold, which reduces working time and costs and improves the accuracy of the bending process.
[0029] Furthermore, in the bending method according to this embodiment, a reference position is set at a predetermined position in the striped pattern, and the bending angle during bending is corrected according to the amount of offset from the reference position. This makes it possible to improve the accuracy of bending even for workpieces with protrusions formed on their surface.
[0030] Furthermore, in the bending process of the bending method according to this embodiment, both sides of the bending line are supported by the surface of the die, and the die rotates toward the bending line to perform the bending process. This reduces bending scratches and improves the accuracy of the bending process, even for workpieces with protrusions formed on their surface.
[0031] As described above, embodiments of the present invention have been presented, but the statements and drawings that constitute part of this disclosure should not be understood as limiting the invention. Various alternative embodiments, examples, and operational techniques will become apparent to those skilled in the art from this disclosure. [Explanation of symbols]
[0032] 31 Reference position 41, 42 cutting line 51 Contact area 61 Contact area a1, a4 ends F, f1 offset amount h Pattern width K Distance between curved lines L1, L2 bend lines P, P1~P6 products Double job
Claims
1. A cutting process in which multiple products of the same shape are cut out from a workpiece in which multiple protrusions are formed on the surface in a regular pattern, The process includes a bending step in which the multiple products cut out in the cutting step are bent along the same bending line, In the cutting process, the multiple products are cut out such that the shape of the protrusions on the bending line matches for all of the multiple products. Bending process.
2. In the plurality of products cut from a direction parallel to the bending line, the bending line is set to be parallel to the pattern and on the same straight line. The bending method according to claim 1.
3. In the plurality of products cut from a direction perpendicular to the bending line, the bending line is set at a distance equal to a multiple of the width of the pattern. The bending method according to claim 1.
4. A reference position is set at a predetermined position in the pattern, and the bending angle when performing the bending process is corrected according to the amount of offset from the reference position. The bending method according to any one of claims 1 to 3.
5. In the bending process, both sides of the bend line are supported by the surface of the die, and the die rotates toward the bend line to perform the bending process. The bending method according to any one of claims 1 to 3.