Chamfering method

Abstract

Chamfering can be performed even on products with right angles, and chamfering can also be performed on products with precise shapes. [Solution] The chamfering method includes: a cutting step S1 in which a workpiece W is laser-cut to cut the workpiece W in such a way that the product P and the scrap material M are connected by a joint J; a first roller placement step S3 in which a ball roller 1 is placed at the boundary between the product P and the scrap material M on one side of the workpiece W; a second roller placement step S5 in which a second roller 5 is placed at the boundary between the product P and the scrap material M on the other side of the workpiece W; and a chamfering step S7 in which the workpiece W is sandwiched between the ball roller 1 and the second roller 5 and pressed, and the product P is moved in the vertical direction while the product P is chamfered, with the scrap material M fixed so as not to move in the vertical direction.

Description

[Technical Field]

[0001] The present invention relates to a chamfering method. [Background Art]

[0002] Conventionally, Patent Document 1 discloses a chamfering method in which the outer shape of a product is cut by laser processing, and chamfering is performed by sandwiching a work, in which the product and a scrap material are connected by a joint, from above and below with rollers. In the chamfering method disclosed in Patent Document 1, a protrusion is provided on a roller, a tapered chamfered surface is provided on one side surface of the protrusion, the protrusion is pressed and inserted into a slit between the product and the scrap material, and the chamfering of the product is performed. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2018-199158 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] However, in the above-described conventional chamfering method, since the protrusion is pressed and inserted into the slit between the product and the scrap material, when the shape of the product becomes precise and the corners of the product have a shape close to a right angle, the protrusion may bite into the product and the scrap material, which may make chamfering difficult. [Means for Solving the Problem]

[0005] One or more embodiments of this method include a cutting step of performing laser cutting on a workpiece to cut it in such a way that the product and the scrap material, which is a part other than the product, are connected by a joint; a first roller placement step of placing a first roller at the boundary between the product and the scrap material on one side of the workpiece; a second roller placement step of placing a second roller at the boundary between the product and the scrap material on the other side of the workpiece; and a chamfering step of performing chamfering on the product while moving it vertically, with the workpiece sandwiched and pressed between the first roller and the second roller to fix the scrap material so that it does not move vertically. [Effects of the Invention]

[0006] According to one or more embodiments of the chamfering method, chamfering can be performed even if the corners of the product are at right angles, and chamfering can be performed even on products with precise shapes. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a flowchart showing a chamfering method according to one embodiment. [Figure 2] Figure 2 shows an example of a workpiece cut in the cutting step of a chamfering method according to one embodiment. [Figure 3] Figure 3 shows the state in which the ball rollers are positioned in the first roller positioning step of a chamfering method according to one embodiment. [Figure 4] Figure 4 shows the state in which the second roller is positioned during the second roller positioning step of a chamfering method according to one embodiment. [Figure 5] Figure 5 shows the state in which chamfering is being performed in the chamfering step of a chamfering method according to one embodiment. [Figure 6] Figure 6 shows a first roller used in a chamfering method according to a modified example 2 of one embodiment. [Figure 7] Figure 7 shows a second roller used in a chamfering method according to a modified example 3 of one embodiment. [Modes for carrying out the invention]

[0008] The chamfering method according to this embodiment will be described below with reference to the drawings. Figure 1 is a flowchart of the chamfering method according to this embodiment. As shown in Figure 1, the chamfering method includes a cutting step S1, a first roller placement step S3, a second roller placement step S5, and a chamfering step S7, and is a method of cutting a product from a workpiece and performing chamfering on the product.

[0009] In cutting process S1, the workpiece is laser-cut to create a joint connecting the product and the off-material portion. As shown in Figure 2, a plate-shaped workpiece W is laser-cut using a laser cutting machine to create a joint connecting the product P and the off-material M via a fine connecting part, the joint J. The cut workpiece W is then placed on a punch press (not shown) or a combined machine that performs both laser cutting and punching.

[0010] In the first roller placement step S3, the first roller is placed at the boundary between the product P and the scrap material M on one side of the workpiece W. As shown in Figure 3, as an example of the first roller, a ball roller 1 is placed at the boundary between the product P and the scrap material M on the lower side of the workpiece W. Since the ball roller 1 is a sphere, its surface is an inclined surface formed by the spherical surface. In other words, the ball roller 1 has an inclined surface.

[0011] Then, in the first roller placement step S3, the ball roller 1 is positioned at the boundary between the product P and the scrap material M on the lower surface of the workpiece W so that the inclined surface of the ball roller 1 contacts the end of the product P. At this time, the position 3 directly above the center of the ball roller 1 is positioned at the end of the product P, and the position 3 directly above the center is offset from the end of the product P according to the amount of chamfering of the product P.

[0012] Here, the larger the offset amount F1 is toward the product P side, the larger the chamfer amount of product P becomes, and the larger the offset amount F1 is toward the scrap material M side, the smaller the chamfer amount of product P becomes. However, if the offset amount F1 is made too large toward the product P side, the ball roller 1 will no longer contact the scrap material M, so the offset amount F1 is set within the range in which the ball roller 1 contacts the scrap material M. Similarly, if the offset amount F1 is made too large toward the scrap material M side, the ball roller 1 will no longer contact product P, so the offset amount F1 is set within the range in which the ball roller 1 contacts product P.

[0013] Furthermore, the ball roller 1 is mounted on the lower die attached to the lower turret of the punch press (not shown), and is mounted with a free bearing, allowing it to rotate in all directions. The punch press is equipped with an upper turret and a lower turret, and the upper die and lower die are detachably mounted on each of them.

[0014] The upper and lower turrets are equipped with auto-indexing devices that rotate the mounted upper and lower dies around an axis extending in the vertical direction, so that the upper and lower dies rotate synchronously around the vertical axis. This first roller placement process S3 is performed by the punch press controller.

[0015] In the second roller placement step S5, the second roller is placed at the boundary between the product P and the scrap material M on the other side of the workpiece W. As shown in Figure 4, the second roller 5 is a roller in which a cylindrical portion 7 and a tapered portion 9 are joined at their bottom surfaces. The cylindrical portion 7 has a cylindrical shape, and the tapered portion 9 has a tapered shape, with the larger bottom surface of the tapered portion 9 being joined to the bottom surface of the cylindrical portion 7. Therefore, the second roller 5 has both a cylindrical shape and a tapered shape.

[0016] Then, in the second roller arrangement step S5, the second roller 5 is arranged at the boundary between the product P on the upper surface of the workpiece W and the scrap M such that the cylindrical side surface of the cylindrical portion 7 is in contact with the scrap M and the tapered side surface of the tapered portion 9 is in contact with the end portion of the product P. At this time, the boundary position 11 between the tapered shape and the cylindrical shape is arranged at the end of the scrap M, and the boundary position 11 is offset from the end of the scrap M in accordance with the chamfering amount of the product P.

[0017] Here, the offset amount F2 is set from the end of the scrap M toward the product P side, and the larger the offset amount F2 is, the larger the chamfering amount of the product P becomes. However, if the offset amount F2 is excessively increased, the cylindrical portion 7 will be arranged above the product P, making it impossible to perform chamfering on the product P. Therefore, the offset amount F2 is set to be smaller than the cutting width between the product P and the scrap M.

[0018] Further, when the angle θ of the tapered side surface is reduced, the chamfering amount of the product P can be increased. Therefore, the second roller 5 having a side surface angle θ corresponding to the chamfering amount of the product P may be selected and used.

[0019] Furthermore, the second roller 5 is provided on an upper die attached to an upper turret of a punch press (not shown), and is rotatably mounted around a horizontal rotating shaft 13. The upper die moves in the vertical direction, and can press the workpiece W while sandwiching it between the ball roller 1 and the second roller 5. The processing of the second roller arrangement step S5 described above is executed by a controller of the punch press.

[0020] In the chamfering step S7, the workpiece W is sandwiched and pressed between the ball roller 1 and the second roller 5, and in a state where the scrap M is fixed so as not to move in the vertical direction, chamfering of the product P is performed while moving the product P in the vertical direction. This processing is executed by a controller of the punch press.

[0021] As shown in Figure 5, when the second roller 5 is lowered with the workpiece W placed on the ball roller 1, the cylindrical side surface of the cylindrical part 7 comes into contact with the upper surface of the scrap material M, and the inclined surface of the ball roller 1 comes into contact with the lower surface of the scrap material M. Therefore, the scrap material M is fixed in place so that it does not move in the vertical direction.

[0022] On the other hand, when the second roller 5 is lowered and the workpiece W is sandwiched between the ball roller 1 and the second roller 5 and pressed, the inclined surface of the ball roller 1 comes into contact with the lower surface of the product P, lifting the product P, and the product P begins to rise. Then, when the upper surface of the product P comes into contact with the tapered side surface of the tapered portion 9, the product P is chamfered while rising slightly along the tapered side surface. Therefore, in the chamfering process S7, the product P is chamfered while it is moved in the vertical direction.

[0023] At this time, the edge of the upper surface of product P makes point contact with the tapered side surface, concentrating pressure, and thus chamfering occurs. Similarly, the edge of the lower surface of product P makes point contact with the inclined surface of ball roller 1, concentrating pressure, and thus chamfering occurs. In particular, since the inclined surface of ball roller 1 is spherical, the depth of the chamfering (length in the vertical direction) becomes small, and the width of the chamfering (length in the horizontal direction) becomes large.

[0024] Furthermore, the bottom edge of the scrap material M makes point contact with the inclined surface of the ball roller 1, concentrating pressure, and thus chamfering is performed. On the other hand, the top surface of the scrap material M makes contact with the flat cylindrical side surface, so chamfering is not performed there. Therefore, chamfering is performed at three locations: the top and bottom surfaces of product P and the bottom surface of scrap material M.

[0025] Although product P is moved vertically relative to the scrap material M, any joint J used in general laser cutting will suffice. Since the distance product P moves is only a few tenths of a millimeter, it is perfectly possible to move product P without having to take measures such as reducing the thickness of joint J.

[0026] Once the chamfering process has been performed around the entire perimeter of product P, the chamfering method according to this embodiment is complete.

[0027] [Example 1] In the embodiment described above, the ball roller 1 is positioned on the lower side of the workpiece W and the second roller 5 is positioned on the upper side of the workpiece W. However, the ball roller 1 may be positioned on the upper side of the workpiece W and the second roller 5 may be positioned on the lower side of the workpiece W. In this case, the chamfering process is performed on the product P as it descends.

[0028] [Differentiation 2] In the embodiment described above, a ball roller 1 was used as an example of the first roller, but instead of the ball roller 1, the first roller 21 shown in Figure 6 may be used. As shown in Figure 6, the first roller 21 is a roller with a cylindrical portion 23 that has a cylindrical shape, and a convex shape 27 formed by two inclined surfaces 25 and 26 in the center. The inclined surfaces 25 and 26 are each formed by a tapered shape, and the larger bottom surface of the two tapered shapes is joined to form the convex shape 27.

[0029] The first roller 21 is provided on the upper or lower mold and is mounted so as to be rotatable around a horizontal rotation axis 28. By using such a first roller 21, the angle θ of the inclined surfaces 25 and 26 can be reduced, so that the chamfering amount of the product P can be increased compared to that of the ball roller 1. In other words, the depth of the chamfering (length in the vertical direction) can be increased, and the width of the chamfering (length in the horizontal direction) can be reduced.

[0030] [Difference 3] In the embodiment described above, the second roller 5 was used as an example, but the second roller 31 shown in Figure 7 may be used instead of the second roller 5. As shown in Figure 7, the second roller 31 differs from the second roller 5 in that it has an additional cylindrical portion 33 in its structure.

[0031] In the second roller 31, reducing the angle θ of the side surface of the tapered portion 9 reduces the width of the tapered portion 9 in the left-right direction. Therefore, a cylindrical portion 33 is added to prevent the overall width of the second roller 31 from decreasing in the left-right direction. By using such a second roller 31, the angle θ of the side surface of the tapered shape can be reduced, thereby increasing the chamfer amount of the product P.

[0032] [Effects of the Embodiment] As described in detail above, in the chamfering method according to this embodiment, the workpiece W is sandwiched between the ball roller 1 and the second roller 5 and pressed, and the chamfering of the product P is performed while moving the product P in the vertical direction, with the scrap material M fixed so as not to move in the vertical direction. As a result, chamfering can be performed even if the corners of the product P are right angles, and therefore chamfering can be performed even if the product P has a precise shape.

[0033] In particular, in laser cutting, the gap between the product P and the scrap material M is narrow, making it difficult to perform chamfering if the product P has a precise shape. However, in the chamfering method according to this embodiment, for example, as shown in Figure 5, the product P is elevated relative to the scrap material M, so the end of the product P protrudes above the upper surface of the scrap material M. Therefore, the end of the product P can reliably contact the second roller 5, and high-quality chamfering can be performed even if the corners of the product P are right angles.

[0034] Furthermore, in the chamfering method according to this embodiment, the ball roller 1 has an inclined surface, and in the first roller placement step S3, the ball roller 1 is placed at the boundary between the product P and the scrap material M on one side of the workpiece W so that the inclined surface of the ball roller 1 contacts the end of the product P. Then, the second roller 5 has a cylindrical shape and a tapered shape, and in the second roller placement step S5, the second roller 5 is placed at the boundary between the product P and the scrap material M on the other side of the workpiece W so that the side surface of the cylindrical shape contacts the scrap material M and the side surface of the tapered shape contacts the end of the product P. This allows the chamfering of the product P to be performed while moving the product P in the vertical direction, with the scrap material M fixed so that it does not move in the vertical direction. Therefore, chamfering can be performed even if the corners of the product P are right angles, and thus chamfering can be performed even if the product P has a precise shape.

[0035] Furthermore, in the chamfering method according to this embodiment, the boundary position 11 between the tapered shape and the cylindrical shape of the second roller 5 is positioned at the end of the scrap material M, and the boundary position 11 is offset from the end of the scrap material M according to the amount of chamfering of the product P. As a result, the amount of chamfering of the product P can be adjusted by adjusting the amount of offset of the boundary position 11.

[0036] Furthermore, in the chamfering method according to this embodiment, the first roller is a ball roller 1. This allows the chamfering of one side of the product P to be performed by utilizing the inclined surface formed by the spherical surface of the ball roller 1.

[0037] Furthermore, in the chamfering method according to this embodiment, the position 3 directly above the center of the ball roller 1 is positioned at the end of the product P, and the position 3 directly above is offset from the end of the product P according to the amount of chamfering of the product P. As a result, the amount of chamfering of the product P can be adjusted by adjusting the offset amount of the position 3 directly above.

[0038] 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]

[0039] 1 Ball Roller 3 Directly above position 5, 31 Second Laura 7, 23, 33 Cylindrical section 9 Tapered section 11 Boundary position 13, 28 Rotation axis 21 First Laura 25, 26 Slope 27 Convex shape F1, F2 offset amount J-joint M scrap material P product Double job

Claims

1. A cutting process in which the workpiece is laser-cut to cut it so that the product and the scrap material (the part other than the product) are connected by a joint, A first roller placement step involves placing a first roller at the boundary between the product and the scrap material on one side of the workpiece, A second roller placement step involves placing a second roller at the boundary between the product and the scrap material on the other side of the workpiece, A chamfering process in which the workpiece is sandwiched between the first roller and the second roller and pressed, and the chamfering process is performed on the product while moving the product in the vertical direction, while the product is fixed in place so that the end material does not move in the vertical direction. A chamfering method that includes this process.

2. The first roller has an inclined surface, In the first roller placement step, the first roller is positioned at the boundary between the product and the end material on one side of the workpiece such that the inclined surface contacts the end of the product. The second roller comprises a cylindrical shape and a tapered shape, In the second roller placement step, the second roller is positioned on the other side of the workpiece at the boundary between the product and the end material such that the cylindrical side surface contacts the end material and the tapered side surface contacts the end of the product. The chamfering method according to claim 1.

3. The boundary between the tapered shape and the cylindrical shape is positioned at the end of the end material, and the boundary is offset from the end of the end material according to the chamfer amount of the product. The chamfering method according to claim 2.

4. The first roller is a ball roller. The chamfering method according to any one of claims 1 to 3.

5. The position directly above the center of the ball roller is positioned at the end of the product, and the position directly above is offset from the end of the product according to the chamfer amount of the product. The chamfering method according to claim 4.

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