Twisting device and twisting method

Abstract

To easily perform twisting into a complicated shape.SOLUTION: Two twisting rollers are arranged opposite each other and a plate material is passed between the two opposed twisting rollers to be twisted. The two twisting rollers have parallel parts formed into a same diameter and tapered parts connected to the parallel parts and gradually increasing from the diameter of the parallel parts. Then while the tapered part of one twisting roller and the parallel part of the other twisting roller are placed in proximity and the tapered part of the other twisting roller and the parallel part of the one twisting roller are placed in proximity, the plate material is passed between the two arranged twisting rollers to be twisted.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention is suitable for twisting a plate material such as a metal plate. Right, right? The present invention relates to a twisting device and a twisting method. [Background technology]

[0002] Conventionally, to obtain continuously twisted structures such as wind turbine blades and propellers, metal bodies have been cut into the required shape or cast. Cutting produces a lot of chips and takes a long time to cut into the required shape. Casting requires a sand mold for each product, which requires a great deal of effort to produce.

[0003] Patent Document 1 describes an example of a process for manufacturing a washer with a partially missing shape, in which a strip of metal material is compressed with a pair of tapered rollers to produce a washer curved into a circular shape. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-297063 Summary of the Invention [Problem to be solved by the invention]

[0005] As described in Patent Document 1, it has been known that the entire component, such as a washer, is formed into an approximately uniform circular shape by placing the inclined surfaces of tapered rollers, each having a conically inclined surface, opposite each other and compressing a metal material. However, it has been extremely difficult to form structures with complex twisted shapes, such as wind turbine blades and propellers, using compression processing with conventional methods.

[0006] The object of the present invention is to provide a method for twisting a complicated shape. R, neTo provide a twisting device and a twisting method. [Means for solving the problem]

[0008] The twisting device of the present invention is a twisting device that arranges two twisting rollers opposite each other and twists a plate material by passing the plate material between the two oppositely arranged twisting rollers, and the two twisting rollers have parallel portions formed to the same diameter and tapered portions connected to one end of the parallel portions and gradually thickening at a predetermined taper angle from the diameter of the parallel portion, and the other end of the parallel portion terminates without changing the diameter, and is provided with a holding portion that holds the two twisting rollers in a state where the tapered portion of one twisting roller and the parallel portion of the other twisting roller are close to each other, and where the tapered portion of the other twisting roller and the parallel portion of the one twisting roller are close to each other. Here, the holding unit arranges the two twisting rollers at a skewed angle from the width direction of the plate material to be passed between the two twisting rollers, and arranges the two twisting rollers at a skewed angle, and arranges the gap between the parallel parts of the two twisting rollers facing each other so that it is approximately equal to the thickness of the plate material, and passes the plate material between the twisting rollers arranged opposite each other, and one side of the plate material is tapered to the parallel part of one of the two twisting rollers. Department The other side of the plate material is passed through the parallel part of the other roller of the two twisting rollers so that it comes into contact with the connecting part of the roller. Department By passing the plate material so as to come into contact with the connecting portion of the plate material, one surface and the other surface of the plate material are twisted in opposite directions at a twist angle determined by a combination of the taper angle and the skew angle.

[0009] The twisting method of the present invention is a method of twisting a plate material by passing it between two twisting rollers arranged opposite each other, wherein the two twisting rollers have parallel portions formed with the same diameter and tapered portions connected to one end of the parallel portions and gradually increasing in diameter at a predetermined taper angle from the diameter of the parallel portion, and the other end of the parallel portions terminates without changing the diameter. The tapered portion of one twisting roller and the parallel portion of the other twisting roller are arranged in close proximity to each other, and the tapered portion of the other twisting roller and the parallel portion of the one twisting roller are arranged in close proximity to each other, and the plate material is twisted by passing it between the two twisting rollers arranged. Here, the two twisting rollers are arranged at a predetermined skew angle from the width direction of the plate material passing between the two twisting rollers, and the two twisting rollers are arranged at a shifted angle, and the gap between the parallel parts of the two twisting rollers facing each other is arranged so as to be approximately equal to the thickness of the plate material, and the plate material is passed between the twisting rollers arranged opposite each other, and one side of the plate material is tapered with the parallel part of one of the two twisting rollers. Department The other side of the plate material is passed through the parallel part of the other roller of the two twisting rollers so that it comes into contact with the connecting part of the roller. Department By passing the plate material so as to come into contact with the connecting portion of the plate material, one surface and the other surface of the plate material are twisted in opposite directions at a twist angle determined by a combination of the taper angle and the skew angle. [Effects of the Invention]

[0010] According to the present invention, two twisting rollers are arranged opposite each other, and the plate material is passed between the two twisting rollers arranged opposite each other, thereby twisting the plate material using a rolling method. [Brief explanation of the drawings]

[0011] [Figure 1]1 is a conceptual diagram showing an example of a twisting processing state according to an embodiment of the present invention. FIG. [Figure 2] 1 is a plan view showing an arrangement of a twisting roller and a metal material according to an embodiment of the present invention; [Figure 3] 1 is a perspective view showing an arrangement of a twisting roller and a metal material according to an embodiment of the present invention; [Figure 4] 1 is a plan view showing the shape of a twisting roller according to an embodiment of the present invention; [Figure 5] 1 is a plan view showing an example of the arrangement of two twisting rollers according to an embodiment of the present invention. [Figure 6] 1 is a configuration diagram showing an example of a twisting device according to an embodiment of the present invention; [Figure 7] 1 is a diagram showing an example (Example 1) of a member to be processed by a twisting device according to an embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing an example (Example 2) of a member to be processed by a twisting device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the present invention (hereinafter referred to as "this example") will be described below with reference to the accompanying drawings. FIG. 1 is a conceptual diagram showing an example of the twisting processing state of this example. In the twisting process of this example, a first twisting roller 10 and a second twisting roller 20 are prepared and arranged opposite each other, and a plate material 1a is passed between the two twisting rollers 10, 20, and pressure is applied by the twisting rollers 10, 20 in a rolling manner as it passes through. This results in a twisted plate material 1b. For example, a metal material is used as the plate material 1. When it is not necessary to distinguish between the plate materials 1a and 1b before and after twisting, the plate materials 1a and 1b will be referred to as the plate material 1 without the symbols a and b. The plate material 1 to be rolled may be either a plate whose thickness is reduced by rolling or a plate whose thickness remains unchanged after only being twisted.

[0013] The first twisting roller 10 has a parallel portion 11 and a tapered portion 13 , and the parallel portion 11 and the tapered portion 13 are connected at a connecting portion 12 . The second twisting roller 20 has the same shape as the first twisting roller 10. That is, the second twisting roller 20 has a parallel portion 21 and a tapered portion 23, and the parallel portion 21 and the tapered portion 23 are connected by a connecting portion 22.

[0014] As shown in Figure 1, the tapered portion 13 of the first twisting roller 10 and the tapered portion 23 of the second twisting roller 20 are arranged to face in opposite directions, and each processing roller 10, 20 is arranged with a skew angle described below, and the twisting condition of the plate material 1 is set by the skew angle and the angle of the tapered portions 13, 23. The plate material 1 can be pressed between the rollers 10 and 20 mainly by the following three methods. The first method is to drive the rollers 10 and 20 and guide the plate material 1 by frictional force. The second method is to use the rollers 10 and 20 as followers that rotate in conjunction with the movement of the metal material 1, and to push the plate material 1 in from behind the metal material 1. The third method is to push the plate material 1 from behind while driving the rollers 10 and 20. Of these three methods, the first has the possibility of slippage, the second has the possibility of the plate buckling, and the third is the most stable method for twisting.

[0015] 2 and 3 show a specific positional relationship between the first twisting roller 10 and the second twisting roller 20 and the plate material 1. Here, a metal material is used as an example of the plate material 1, and in the following description, the plate material 1 will be referred to as the metal material 1. FIG. 2 is a plan view, and FIG. 3 is a perspective view. 2 and 3, the first twisting roller 10 has its tapered portion 13 disposed on one side in the width direction of the metal material 1 (the left side in FIG. 2), and the second twisting roller 20 has its tapered portion 23 disposed on the other side in the width direction of the metal material 1 (the right side in FIG. 2). As can be seen in FIG. 2, there is also a section where the parallel portions 11, 21 of the twisting rollers 10, 20 overlap. The function of this section where the parallel portions 11, 21 overlap will be explained with reference to FIG. 5.

[0016] As a result, the tapered portion 13 of the first twisting roller 10 comes close to the parallel portion 21 of the second twisting roller 20. Therefore, the metal material 1b that passes through the area where the tapered portion 13 of the first twisting roller 10 and the parallel portion 21 of the second twisting roller 20 come close to each other is twisted downward by the tapered portion 13.

[0017] Furthermore, the tapered portion 23 of the second twisting roller 20 is adjacent to the parallel portion 11 of the first twisting roller 10. Therefore, the metal material 1b that passes through the area where the tapered portion 23 of the second twisting roller 20 and the parallel portion 11 of the first twisting roller 10 are adjacent to each other is twisted upward by the tapered portion 13. Therefore, the metal material 1b that has passed between the first twisting roller 10 and the second twisting roller 20 is in a state where the left and right ends are twisted in opposite directions, downward and upward.

[0018] FIG. 4 shows a plan view of the first twisting roller 10 and the second twisting roller 20. As shown in FIG. As shown in Figure 4, the tapered portions 13, 23 of the twisting rollers 10, 20 are inclined at a predetermined angle θ1. The angle θ1 is selected, for example, from the range of 5° to 20°. The angle θ1 of the tapered portion 13 of the first twisting roller 10 and the angle θ1 of the tapered portion 23 of the second twisting roller 20 may be the same or different. When the angles are different, a molded product with a spiral staircase shape is obtained, in which the central axis of the plate describes a spiral trajectory as the plate is twisted.

[0019] The twist angle of the metal material 1b can be increased by increasing the angle θ1 of the tapered portions 13, 23. However, the twist angle of the metal material 1b is determined by a combination of the taper angle θ1 and the skew angle at which the rollers 10, 20 are arranged.

[0020] Figure 5 shows the skew angle when arranging the first twisting roller 10 and the second twisting roller 20, and details of the section where the two rollers 10, 20 overlap. In Figure 5, a rotating shaft 14 is attached to the first twisting roller 10, and a rotating shaft 24 is attached to the second twisting roller 20. In Figure 5, 15 and 25, indicated by dashed lines, are the rotation centers of the rotating shafts 14 and 24, respectively.

[0021] The first twisting roller 10 is attached to the processing device at a skew angle Φ1 with respect to a reference line 31 (a line perpendicular to the direction of travel during rolling) that indicates the width direction of the metal material 1. The second twisting roller 20 is attached to the processing device at a skew angle Φ2 with respect to the reference line 31.

[0022] The skew angles Φ1 and Φ2 are set to angles selected, for example, from the range of 5° to 20°. Therefore, the first twisting roller 10 and the second twisting roller 20 are arranged in a state shifted by an angle R1 of Φ1+Φ2. The two skew angles Φ1 and Φ2 may be the same or different. As with the taper angles, when the skew angles are different, the plate is twisted and the central axis of the plate traces a spiral trajectory, resulting in a molded product with a spiral staircase shape.

[0023] The overlap lengths d1 and d2 of the parallel portions 11 and 21, as viewed from the overlapping point of the twisting rollers 10 and 20, are set according to the state of twisting of the metal material 1. In the example of FIG. 5, the lengths d1 and d2 are set to different values, but they may be set to the same value depending on the state of twisting of the metal material 1. Also, for example, the tapered portions 13 and 23 may be arranged so that they are almost close to each other, with the lengths d1 and d2 being almost zero. When the lengths d1 and d2 are equal, a molded product is obtained in which the central axis of the plate is twisted without deviation. When the lengths d1 and d2 are different, a molded product with a spiral staircase shape is obtained in which the central axis of the plate describes a spiral trajectory as the plate is twisted.

[0024] FIG. 6 shows the configuration of a twisting device in which twisting rollers 10 and 20 are arranged. The twisting device shown in Figure 6 has upper holding portions 41 and 42 that rotatably hold one end and the other end of the rotating shaft 14 of the first twisting roller 10, and lower holding portions 51 and 52 that rotatably hold one end and the other end of the rotating shaft 24 of the second twisting roller 20. Here, the distance h between the parallel portion 11 of the first twisting roller 10 and the parallel portion 21 of the second twisting roller 20 is set according to the thickness of the metal material 1. Normally, the distance h is set to be approximately equal to the thickness of the metal material 1, but if rolling in the general sense, which is a process for reducing the thickness of the metal material 1, is performed at the same time, the distance h may be set to be narrower than the thickness of the metal material 1. Note that the rolling described in this specification includes not only the case of reducing the thickness of the metal material 1 that is the material to be rolled, but also the case of changing the cross-sectional shape of the metal material 1 that is the material to be rolled. The two twisting rollers 10, 20 held by the respective holding portions 41, 42, 51, 52 may be either driven by a drive source or driven by the movement of the metal plate 1. In addition, when the metal material 1 is pushed in from behind, a pushing mechanism for the metal material 1 is provided. As already explained, it is preferable to use a system in which the two twisting rollers 10, 20 are driven by a drive source while the metal material 1 is pushed in from behind, but it is also possible to use a system in which the twisting rollers 10, 20 are driven by a drive source or a system in which the metal material 1 is pushed in from behind.

[0025] In addition, it is preferable that the twisting device be configured so that the skew angles Φ1 and Φ2 of the two twisting rollers 10 and 20 held by the holding portions 41, 42, 51 and 52, and the overlapping lengths d1 and d2 of the parallel portions 11 and 21 of the two twisting rollers 10 and 20 can be variably set.

[0026] 7 and 8 show examples of metal materials processed by the twisting device shown in FIG. FIG. 7 shows an example in which a metal material 110a is twisted to form propeller blades. As shown in Figure 7(a), the twisting device of this example produces a twisted metal material 110a. The twisting here is a relatively weak twisting. The weak twisting shown in Figure 7 can be achieved by setting the angles θ1 and θ2 of the tapered portions 13 and 23 and the skew angles Φ1 and Φ2 to relatively small values ​​corresponding to the weak twisting. Furthermore, if the twist state (twist angle) changes during processing, this can be achieved by changing the skew angles Φ1 and Φ2 or the lengths d1 and d2 (Fig. 5) during processing.

[0027] The metal material 110a thus twisted is cut along cutting lines 111 as shown in FIG. 7(b) to form metal material 110b having the desired wing shape. A plurality of metal materials 110b shown in FIG. 7(b) are prepared and assembled to obtain the propeller shown in FIG. 7(c).

[0028] FIG. 8 shows an example in which a metal material 210 is twisted to form a screw. Fig. 8(a) shows the twisted metal material 210 as viewed from its end, and Fig. 8(b) shows the twisted metal material 210 as viewed obliquely. Note that the imaginary lines L1, L2, L3, ... shown in Fig. 8(a) indicate the positions on the left side of Fig. 8(a) where the imaginary lines L1, L2, L3, ... of the metal material before twisting correspond to those after twisting. The example of FIG. 8 is a case where the metal material 200 is subjected to a continuous strong twisting process, as shown in FIG. 8(b).

[0029] Then, as shown in Fig. 8(a), a central shaft hole 211 is drilled in the center of the metal material 210. Furthermore, as shown in Fig. 8(b), a central shaft member 212 is fitted into the central shaft hole 211 to complete the screw.

[0030] The strong twisting process shown in FIG. 8 can be realized by setting the angles θ1, θ2 of the tapered portions 13, 23 and the skew angles Φ1, Φ2 to relatively large values ​​corresponding to the strong twisting process.

[0031] As described above, the twisting device of this example can twist metal or other plate materials into a desired shape by rolling. Therefore, twisted parts of various desired shapes, such as propeller blades as shown in Fig. 7 and screws as shown in Fig. 8, can be easily obtained without cutting or casting. In this case, the twist state can be adjusted by setting the angle of the tapered portion and the skew angle, making it possible to process a variety of shapes.

[0032] When passing a metal plate between the rollers 10 and 20, the rollers 10 and 20 may be heated and the plate may be processed by applying heat from the rollers 10 and 20. Alternatively, the plate may be heated at the location to be twisted using an external torch or laser. Furthermore, in the above-described embodiments, examples of twisting metal plate materials have been described, but the present invention may also be used to twist plate materials other than metal. For example, FRP (Fiber Reinforced Plastics) containing thermoplastic resin or pre-sintered ceramics may be used as the plate material. In the case of FRP containing thermoplastic resin, it is necessary to heat the rollers 10, 20 as described above and apply heat to the plate material from the rollers 10, 20 to process it. [Explanation of symbols]

[0033] 1...plate material (metal material: rolled material), 1a...metal material (before twisting), 1b...metal material (after twisting), 10...first twisting roller, 11...parallel portion, 12...tapered end, 13...tapered portion, 14...rotation shaft, 15...rotation center, 20...second twisting roller, 21...parallel portion, 22...tapered end, 23...tapered portion, 24...rotation shaft, 25...rotation center, 31...reference line, 41, 42, 51, 52...holding portion, 100...propeller, 110a...metal material, 110b...metal material (after cutting), 111...cutting line, 210...metal material, 211...center shaft hole, 212 center shaft member

Claims

1. Two twisting rollers are arranged opposite to each other, A twisting device that twists a plate material by rolling the plate material through two twisting rollers that are arranged opposite to each other, The two twisting rollers are a parallel portion formed to have the same diameter; a tapered portion connected to one end of the parallel portion and gradually increasing in diameter from the diameter of the parallel portion at a predetermined taper angle, The other end of the parallel portion is configured to terminate without changing the diameter, a holding part for holding the two twisting rollers, with the tapered part of one of the twisting rollers and the parallel part of the other of the twisting rollers being in close proximity to each other, and the tapered part of the other of the twisting rollers being in close proximity to the parallel part of one of the twisting rollers; The holding unit arranges the two twisting rollers at a skewed angle from the width direction of the plate material passing between the two twisting rollers, and arranges the two twisting rollers at skewed angles, and arranges the gap between the parallel portions of the two twisting rollers facing each other so that it is approximately equal to the thickness of the plate material; The plate material is passed between the twisting rollers arranged opposite to each other, with one surface of the plate material passing through the rollers so as to contact a connecting portion between the parallel portion and the tapered portion of one of the two twisting rollers, and the other surface of the plate material passing through the rollers so as to contact a connecting portion between the parallel portion and the tapered portion of the other of the two twisting rollers, thereby twisting the one surface and the other surface of the plate material in opposite directions at a twist angle determined by a combination of the taper angle and the skew angle. Twisting device.

2. Furthermore, the two twisting rollers are arranged so that the parallel portions of the two twisting rollers overlap by a predetermined length in the width direction of the plate material. The twisting device according to claim 1 .

3. The holding portion is capable of adjusting the skew angle and the predetermined length of the two twisting rollers. The twisting device according to claim 2 .

4. Two twisting rollers are arranged opposite to each other, A twisting method for twisting a plate material by passing the plate material between two twisting rollers disposed opposite to each other, The two twisting rollers are a parallel portion formed to have the same diameter; a tapered portion connected to one end of the parallel portion and gradually increasing in diameter from the diameter of the parallel portion at a predetermined taper angle, The other end of the parallel portion is terminated without changing the diameter, The plate material is twisted by rolling the plate material through the two twisting rollers, with the tapered portion of one of the twisting rollers and the parallel portion of the other of the twisting rollers being in close proximity to each other, and the tapered portion of the other of the twisting rollers being in close proximity to the parallel portion of one of the twisting rollers, The two twisting rollers are arranged at a predetermined skew angle from the width direction of the plate material passing between the two twisting rollers, and the two twisting rollers are arranged at offset angles, and the gap between the parallel portions of the two twisting rollers facing each other is arranged to be approximately equal to the thickness of the plate material; The plate material is passed between the twisting rollers arranged opposite to each other, with one surface of the plate material passing through the rollers so as to contact a connecting portion between the parallel portion and the tapered portion of one of the two twisting rollers, and the other surface of the plate material passing through the rollers so as to contact a connecting portion between the parallel portion and the tapered portion of the other of the two twisting rollers, thereby twisting the one surface and the other surface of the plate material in opposite directions at a twist angle determined by a combination of the taper angle and the skew angle. Twisting method.

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