JP2007083260A - Apparatus for working metallic sheet, and method for manufacturing blade for wind mill using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallic sheet working apparatus with which a metallic sheet can be continuously formed into curved surfaces different in curvature radius; and to provide a method capable of efficiently and highly precisely manufacturing an aerofoil blade for windmills. <P>SOLUTION: The metallic sheet working apparatus 1 is composed of: three rolls 2 arranged at vertexes of a triangle in a side view; a hydraulic press 3 which is a roll shifting means for supporting these three rolls 2 freely rotatably, a servomotor 4 which is a roll rotating means for rotationally driving the three rolls 2; and a controller 5 which is a controlling means for controlling the hydraulic press 3 and the servomotor 4. The metallic sheet working apparatus 1 is also provided with a back gauge 6 for measuring the intervals between the rear end part Ba of the metallic sheet B and the three rolls 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a metal plate processing apparatus and a method of manufacturing a windmill blade using the same, and more specifically, a metal plate processing apparatus capable of continuously forming curved surfaces having different curvature radii on a metal plate and a windmill using the same. The present invention relates to a manufacturing method for a blade.

  Conventionally, as a roll bending machine for bending a metal plate, a lower roll to be rotationally driven is arranged in parallel, positioned above the lower roll, and driven by the progress of the sheet material (metal plate). There is known a roll bending machine in which rolls are disposed and formed so that the rotation center of the three rolls is the apex of a triangle when viewed from the side (see, for example, Patent Document 1).

On the other hand, as a wind turbine blade for a wind turbine for a high-efficiency wind generator that can efficiently rotate the wind turbine even at startup or in a low wind speed region, the blade has a low Reynolds number and a high lift coefficient. There is known a blade for a wind turbine in which a notch portion is formed in a rear edge portion (see, for example, Patent Document 2). Such a blade for a windmill is formed into an airfoil having a low Reynolds number and a high lift coefficient by processing a flat metal plate into a curved surface having a different radius of curvature continuously for each predetermined section.
Japanese Patent Laying-Open No. 2003-33820 (paragraphs 0009 to 0014, FIG. 1) JP 2004-108330 A (paragraphs 0015 to 0027, FIG. 1)

  However, the conventional roll bending machine is not automated, and when continuously forming curved surfaces with different radii of curvature on a metal plate, (1) measure the feed amount of the metal plate, and (2) its position When the roll is set at an interval corresponding to the radius of curvature to be formed, (3) the metal plate is sent out for a predetermined length at a predetermined speed, and (4) the metal plate is sent to the position where the next radius of curvature is reached, (5) It was necessary to manually perform a very complicated process such as resetting the roll so as to obtain an interval corresponding to the next radius of curvature. For this reason, it has been difficult to mass-produce a product in which curved surfaces having different radii of curvature are continuously formed, such as blade blades for wind turbines.

Also, like the front end of the blade for the blade wind turbine (see Fig. 4 numeral K _9), of the continuous curved surface, when a portion of the radius of curvature is small, one end by a roll bending machine When the metal plate is continuously processed from one end to the other end, the bent metal plate interferes with the roll bending machine, and the metal plate may be deformed or the roll bending machine may break down. In order to prevent this, it has been necessary for the operator to always stand by the roll bending machine and to perform work such as stopping the roll bending machine at a predetermined timing.

The present invention has been made to solve such a problem, and an object thereof is to provide a metal plate processing apparatus capable of continuously forming curved surfaces having different curvature radii on a metal plate.
Another object of the present invention is to provide a method for manufacturing a blade for wind turbines capable of efficiently manufacturing a blade blade for wind turbines with high accuracy.

  The metal plate processing apparatus according to the present invention is a metal plate processing apparatus that continuously forms curved surfaces with different radii of curvature on the metal plate, and is arranged in parallel to each other at the positions of the respective vertices of the triangle as viewed from the side. Three rolls supported in a rotatable manner, a roll moving means for bringing a roll interval between one roll of the three rolls and an intermediate position between the other two rolls close to each other, and the three rolls A roll rotating means for rotating at least one of the rolls; a feed amount measuring means for measuring a feed amount of the metal plate inserted between the one roll and the other two rolls; A control means for controlling the roll rotating means and the roll moving means; and an input means for inputting metal plate processing data relating to the processing of the metal plate to the control means. The thickness of the metal plate, An elastic coefficient of the metal plate and a radius of curvature at a predetermined position of the metal plate after processing, and the control means is configured to determine the predetermined position of the metal plate after processing based on the metal plate processing data. For each radius of curvature, the rotational speed of the three rolls and the roll interval are calculated, the feed amount of the metal plate measured by the feed amount measuring means, the calculated rotational speed and The roll rotating means and the roll moving means are controlled based on the roll interval.

  According to such a configuration, the rotation speed and roll interval of the three rolls for each radius of curvature at a predetermined position of the metal plate after processing based on the metal plate processing data input from the input unit by the control unit. And are calculated. The control means controls the roll rotating means and the roll moving means based on the calculated rotation speed, the roll interval, and the measured feed amount of the metal plate. Thereby, the curved surface from which a curvature radius differs can be continuously formed in a metal plate.

  Also, when bending a metal plate, the smaller the radius of curvature, the more slip occurs between the roll and the metal plate. However, since the rotation speed of the roll is adjusted according to the radius of curvature to be processed, the occurrence of slip occurs. Can be suppressed. Therefore, the processing accuracy of the metal plate can be increased.

  The radius of curvature is not limited to the radius of curvature itself, as long as it is data from which the radius of curvature can be derived. For example, the curvature 1 / R having a reciprocal relationship with the curvature radius R may be used as the metal plate processing data. The elastic coefficient of the metal plate may be any data that can be used to derive the elastic coefficient. For example, the relationship between the metal plate material and the elastic coefficient may be stored in advance, and the metal plate material may be input.

  In addition, when the radius of curvature at the predetermined position of the metal plate after processing is equal to or less than the predetermined radius of curvature, the control means regards the radius of curvature at the predetermined position as infinite and calculates the roll interval. It is preferable to do this.

  If it does in this way, a metal plate processing apparatus will treat the curvature radius of this part as infinite about the part whose curvature radius after processing of a metal plate is below a predetermined curvature radius. Therefore, the metal plate processing apparatus recognizes a portion where the radius of curvature after processing is equal to or less than a predetermined radius of curvature as a flat portion, and advances the predetermined range without bending the portion, Bending is performed. That is, according to this metal plate processing apparatus, the metal plate can be continuously bent after the processing of the portion having a predetermined radius of curvature or less is postponed. In addition, when the curvature radius in the predetermined position of the said metal plate after a process is below a predetermined curvature radius, it is good to adjust a roll space | interval so that a metal plate may not bend.

  Here, if the limit curvature radius at which the bent metal plate interferes with the metal plate processing machine is set to the “predetermined radius of curvature”, the processed metal plate and the metal plate processing machine Interference can be prevented. The limit curvature radius is preferably set as appropriate based on the shape and configuration of the metal plate processing machine.

  Further, the control means, based on the metal plate processing data input from the input means, and correlation data between the elastic coefficient of the metal plate, the radius of curvature of the metal plate and the roll interval stored in advance, For each radius of curvature at a predetermined position of the metal plate after processing, the roll interval calculation unit for calculating the roll interval, the roll interval calculated by the roll interval calculation unit, and the feed amount measuring means are measured. Further, based on the feed amount of the metal plate, a roll moving means control unit for controlling the roll moving means, metal plate processing data input from the input means, and a previously stored elastic coefficient of the metal plate Based on the correlation data between the curvature radius of the metal plate and the rotation speed of the three rolls, the rotation of the three rolls for each curvature radius at a predetermined position of the metal plate after processing. Based on a roll rotation speed calculation unit that calculates a degree, a rotation speed of the three rolls calculated by the roll rotation speed calculation unit, and a feed amount of the metal plate measured by the feed amount measuring unit And a roll rotation means controller for controlling the roll rotation means.

  According to such a configuration, since the control means includes correlation data of the elastic coefficient of the metal plate, the radius of curvature of the metal plate, and the roll interval, the control means uses the correlation data and the metal plate processing data based on the correlation data. The roll interval is calculated for each curvature radius to be processed. Further, since the control means includes correlation data of the elastic coefficient of the metal plate, the radius of curvature of the metal plate, and the rotation speed of the three rolls, the control means uses the correlation data and the metal plate processing data based on the correlation data. Thus, the rotation speed of the roll is calculated for each curvature radius to be processed. Based on the calculation result and the feed amount of the metal plate, the roll rotating means and the roll moving means are controlled. Thereby, the curved surface from which a curvature radius differs can be continuously formed in a metal plate.

  In addition, the roll interval calculation unit regards the radius of curvature at the predetermined position as infinite when the radius of curvature at the predetermined position of the metal plate after processing is equal to or less than the predetermined radius of curvature. Is preferably calculated. Moreover, it is preferable that a control apparatus is provided with the curvature radius determination part which determines whether the curvature radius in the predetermined position of the said metal plate after a process is below a predetermined curvature radius.

  Further, the roll moving means is a hydraulic press machine having a movable mold and a fixed mold, and one of the one roll and the two rolls is rotatably fixed to the movable mold, It is preferable that one of the other is rotatably fixed to the fixed mold.

  According to this configuration, it is possible to obtain a metal plate processing apparatus capable of continuously forming curved surfaces having different curvature radii on a metal plate with a simple configuration in which three rolls are combined with a hydraulic press.

  The roll rotating means may be a servo motor, and the feed amount measuring means may be configured to measure the feed amount of the metal plate based on the rotation amount of the servo motor.

  According to such a configuration, the roll rotating unit is composed of a servo motor, and the feed amount measuring unit measures the feed amount of the metal plate based on the rotation amount of the servo motor. The roll rotating means and the feed amount measuring means can be used together. In other words, the feed amount of the metal plate can be controlled with high accuracy by the servo motor. Therefore, the processing accuracy is improved and the number of parts can be reduced.

  The metal plate processing apparatus further includes a back gauge for measuring a distance between a rear end portion of the metal plate and the three rolls, and the control unit is configured to measure the metal plate measured by the feed amount measuring unit. And the distance between the three rolls measured by the back gauge and the distance between the three rolls, and the two are different, the metal plate measured by the back gauge. It is preferable that the feed amount of the metal plate is corrected on the basis of the distance between the rear end portion and the three rolls.

  According to such a configuration, the metal plate processing apparatus further includes the back gauge for measuring the distance between the rear end portion of the metal plate and the three rolls, and therefore the rear end portion of the metal plate and the three rolls. The metal plate feed amount (that is, the actual metal plate feed amount) can be calculated on the basis of the interval. Therefore, even if slip occurs between the three rolls and the metal plate and the feed amount of the metal plate calculated from the rotation amount of the three rolls does not match the actual feed amount of the metal plate, The feed amount of the metal plate can be corrected based on the measurement result by the back gauge. Therefore, the metal plate can be processed with high accuracy based on the accurate feed amount of the metal plate.

  The method for manufacturing a wind turbine blade according to the present invention connects an upper surface and a lower surface in which curved surfaces having a curvature radius larger than a predetermined curvature radius are continuous, the upper surface and the lower surface, and has a predetermined curvature radius or less. A method of manufacturing a blade for a wind turbine configured in an airfoil shape by a front end surface formed of a curved surface, wherein the upper surface and the lower surface are formed on the metal plate using the metal plate processing apparatus according to claim 2. And subsequently forming the front end surface using another metal plate processing apparatus, wherein the predetermined radius of curvature is obtained when the metal plate is processed when a part of the metal plate is processed with the radius of curvature. The processed portion of the plate has a radius of curvature that interferes with the metal plate processing apparatus according to claim 2, and the other metal plate processing device is configured to perform the processing even when the metal plate is processed with the predetermined curvature radius. The processed part of the metal plate interferes Characterized in that it is configured to have a shape.

According to this method, the upper surface and the lower surface of the wind turbine blade are processed in advance by the metal plate processing apparatus according to claim 2. That is, since the metal plate processing apparatus automatically skips the portion corresponding to the front end surface, the metal plate processing device according to claim 2 and the metal plate do not interfere (collision with each other). And since the part equivalent to a front-end surface is processed after that by another metal plate processing apparatus, the blade for windmills can be manufactured efficiently and accurately with ease.
As another metal plate processing apparatus, it is preferable to use a device having a structure in which a moving means or the like is not disposed on the opposite side of the one roll as viewed from the two rolls. As such a metal plate processing apparatus, a manual three-roll or the like can be used.

ADVANTAGE OF THE INVENTION According to this invention, the metal plate processing apparatus which can form continuously the curved surface from which a curvature radius differs in a metal plate can be provided. Therefore, processing of the metal plate is facilitated, and productivity and processing accuracy can be improved.
Further, according to the present invention, it is possible to provide a method for manufacturing a wind turbine blade capable of efficiently manufacturing a blade-type wind turbine blade. Therefore, it is possible to easily and efficiently manufacture the blade-type windmill blade, and it is possible to improve the productivity of the blade-type windmill blade.

The best mode for carrying out the present invention will be described in detail with reference to the drawings. In the description, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, in the present embodiment, description will be given using an example in which the metal plate processing apparatus according to the present invention is applied to manufacture of a blade for a windmill.
FIG. 1 is a perspective view showing a configuration of a metal plate processing apparatus according to the present embodiment. FIG. 2 is a block diagram showing the metal plate processing apparatus according to the present embodiment. FIG. 3 is a flowchart showing the operation of the metal plate processing apparatus according to the present embodiment. FIG. 4 is a side view showing the shape of the wind turbine blade. FIG. 5 is a diagram showing an example of a metal plate processing data storage table. FIG. 6 is a conceptual diagram showing correlation data among the elastic coefficient of the metal plate, the radius of curvature of the metal plate, and the roll interval. FIG. 7 is a conceptual diagram showing correlation data among the elastic coefficient of the metal plate, the radius of curvature of the metal plate, and the rotation speed of the three rolls.

[Configuration of Metal Plate Processing Apparatus 1]
The metal plate processing apparatus 1 is an apparatus that continuously bends the metal plate B. As shown in FIG. 1, three rolls 2 (hereinafter, “ 3 rolls 2 ”), a hydraulic press machine 3 as roll moving means for rotatably supporting the three rolls 2, and a servo motor 4 as roll rotating means for rotationally driving the three rolls 2. And a control device 5 that is a control means for controlling the hydraulic press machine 3 and the servo motor 4. In addition, the metal plate processing apparatus 1 includes a back gauge 6 that measures the distance between the rear end portion Ba of the metal plate B and the three rolls 2. An amplifier 7 that adjusts the rotation of the servo motor 4 is interposed between the servo motor 4 and the control device 5. The control device 5 includes an input device 8 (input means) such as a keyboard and a mouse, and an output device 9 such as a display.

Here, the blade 10 for windmills manufactured using the metal plate processing apparatus 1 which concerns on this embodiment is demonstrated.
As shown in FIG. 4, the windmill blade 10 is formed in a shape like an airplane wing, and includes an upper surface 11 and a lower surface 12 on which curved surfaces having different radii of curvature R (R ₁ , R ₂ ,...) Are continuous. , And a front end face 13 that connects the upper surface 11 and the lower surface 12. The wind turbine blade 10 of the present embodiment is configured by 14 consecutive curved surfaces having different curvature radii R. Further, the wind turbine blade 10 of the present embodiment has a notch portion 14 at the rear end of the lower surface 12, and has a “tsu” shape when viewed from the side.
In the present specification, for convenience of explanation, the surface on which lift acts is referred to as the upper surface 11, and the opposite surface is referred to as the lower surface 12.

(3 rolls 2)
As shown in FIG. 1, the three rolls 2 are devices that sandwich the metal plate B, bend the metal plate B, and play the role of feeding the metal plate B by rotation. Consists of the body. The three rolls 2 are composed of a first roll 2a disposed above, and a second roll 2b and a third roll 2c disposed below. As shown in FIG. 2, each roll 2a, 2b, 2c of the three rolls 2 is located at each vertex of the triangle when viewed from the side, and is arranged in parallel and spaced apart from each other. In this embodiment, the diameter of the 1st roll 2a is comprised larger than the diameter of the 2nd roll 2b and the 3rd roll 2c.

Here, as shown in FIG. 2, the 1st roll 2a is arrange | positioned just above the intermediate position of the 2nd roll 2b and the 3rd roll 2c. Note that the radius of curvature R of the metal plate B decreases as the roll interval D decreases, and the radius of curvature R of the metal plate B increases as the roll interval D increases. In the present embodiment, the three rolls 2 are also configured to be long so that the long windmill blade 10 (see FIG. 4) of the windmill for wind power generator can be processed. The length of the three rolls 2 is preferably about 3 to 4 m.
The first roll 2a is a drive roll that is driven to rotate by a servo motor 4 to be described later. The second roll 2b and the third roll 2c are driven rolls that rotate following the rotation of the drive roll.

(Hydraulic press 3)
The hydraulic press machine 3 is a device that plays a role of bringing the first roll 2a close to and away from an intermediate position between the second roll 2b and the third roll 2c. The fixed mold 32 is disposed opposite to the movable mold 31.

  The movable mold 31 is configured to be movable in the vertical direction by, for example, a hydraulic pump and a hydraulic cylinder (not shown). In addition, as shown in FIG. 2, the movable mold 31 supports the first roll 2a rotatably via a bracket 31a. Specifically, the bracket 31a includes a concave groove 31b having a substantially circular cross-section with a part of the lower portion cut out, and a plurality of bearing rolls 31c and 31c that are rotatably arranged on the inner peripheral surface of the concave groove 31b. The first roll 2a can be rotatably held in the concave groove 31b. Moreover, the concave groove 31b is opened downward. And the 1st roll 2a is arrange | positioned so that a part of outer peripheral surface may protrude from the opening part of the ditch | groove 31b. When such a bracket 31a is used, it is possible to prevent the first roll 2a from being bent, which is preferable.

  The fixed mold 32 is a fixed mold, and as shown in FIG. 2, holds the second roll 2b and the third roll 2c via the bracket 32a so as to be rotatable in a parallel and separated state. . Specifically, the bracket 32a includes two concave grooves 32b and 32b having a semicircular cross section, and a plurality of bearing rolls 32c, 32c arranged so as to face the inner peripheral surface of the concave grooves 32b and 32b. It is configured.

(Servo motor 4)
The servo motor 4 is a device that plays a role of rotating the three rolls 2, and is connected to one side end of the first roll 2a as shown in FIG. The servo motor 4 can precisely control the rotation amount and can also control the rotation speed V. The servo motor 4 is connected to an amplifier 7, and the rotation amount and the rotation speed V are adjusted by the amplifier 7. The servo motor 4 is configured to be movable up and down with the up and down movement of the first roll 2a.
The amplifier 7 transmits the rotation amount of the servo motor 4 to the control device 5 described later. Since the rotation amount of the servo motor 4 is proportional to the feed amount of the metal plate B, the amplifier 7 functions as a feed amount measuring means.

(Control device 5)
The control device 5 plays a role of controlling the hydraulic press machine 3 and the servo motor 4, and is configured, for example, by installing a control program in a computer including an arithmetic device and a memory device. As shown in FIG. 2, the control device 5 includes a roll interval calculation unit 51, a roll moving unit control unit 52, a roll rotation speed calculation unit 53, a roll rotation unit control unit 54, a data storage unit 55, a feed An amount correction unit 56, a feed amount determination unit 57, and a curvature radius determination unit 58 are provided.

  In addition, an input device 8 such as a keyboard, a mouse, or a drive device (not shown) is connected to the control device 5, and the material, thickness, and processing of the metal plate B according to the input screen displayed on the output device 9. It is possible to input machining data such as dimensions (see FIG. 4) (hereinafter sometimes referred to as “metal plate machining data”).

(Roll interval calculator 51)
The roll interval calculation unit 51 calculates the roll interval D (see FIG. 2) of the three rolls 2 for each radius of curvature R at a predetermined position of the metal plate B after processing. Specifically, the roll interval calculation unit 51 inputs the elastic coefficient E of the metal plate B, the thickness t of the metal plate B, and the processing dimension of the metal plate B (see FIG. 4) via the input device 8. Then, based on correlation data 55a (hereinafter, abbreviated as “first correlation data 55a” as appropriate) between the elastic coefficient E of the metal plate B, the radius of curvature R of the metal plate B, and the roll interval D stored in advance. Thus, the roll interval D of the three rolls 2 is calculated for each curvature radius R. The calculated roll intervals D (D ₁ , D ₂ , D ₃ ,...) Are stored in the radius of curvature R (R ₁ , R ₂ ) in the metal plate processing data storage table 55 c of the data storage unit 55 as shown in FIG. , R ₃ ,...).

Here, as shown in FIG. 6, the first correlation data 55a indicates that the larger the radius of curvature R, the larger the roll interval Da at the unit thickness, and the larger the elastic coefficient E of the metal plate B, the unit thickness. In other words, the roll interval Da is reduced. The roll interval D corresponding to the thickness t of the metal plate B can be obtained by multiplying the roll interval Da at the unit thickness thus obtained by the thickness t of the metal plate B. The first correlation data 55a is stored in advance in the data storage unit 55.
The roll interval Da of the first correlation data 55a is set slightly smaller in consideration of the restoring force (return) due to the elasticity of the metal plate B. That is, when the metal plate B is bent, the bent metal plate B is slightly deformed (restored) in the direction of returning to the original direction due to the elasticity of the material. The first correlation data 55a is defined in consideration of the return amount (buckling) of the metal plate B so as to have a predetermined radius of curvature in a state where the bent metal plate B is slightly deformed in the returning direction. ing.

(Roll moving means controller 52)
The roll moving means control unit 52 plays a role of controlling the roll interval D by moving the movable die 31 of the hydraulic press machine 3 up and down. The roll moving means controller 52 refers to the metal plate processing data storage table 55c based on the rotation amount of the three rolls 2 (that is, the feed amount of the metal plate B) transmitted from the amplifier 7 (feed amount measuring means). Thus, the roll interval D corresponding to the radius of curvature R of the processed portion of the current metal plate B is extracted. Then, the roll moving means controller 52 moves the movable die 31 of the hydraulic press machine 3 and thus the first roll 2a up and down based on the extracted roll interval D.

(Roll rotation speed calculation unit 53)
The roll rotation speed calculation unit 53 calculates the rotation speed V of the three rolls 2 (see FIG. 5) for each radius of curvature R at a predetermined position of the metal plate B after processing. Specifically, the roll rotation speed calculation unit 53 receives the elastic coefficient E of the metal plate B, the thickness t of the metal plate B, and the processing dimension of the metal plate B (see FIG. 4) via the input device 8. When input, correlation data 55b (hereinafter abbreviated as “second correlation data 55b” as appropriate) of the elastic coefficient E of the metal plate B, the radius of curvature R of the metal plate B, and the rotational speed V stored in advance is input. Based on the curvature radius R, the rotational speed V of the three rolls 2 is calculated. The calculated rotation speed V (V ₁ , V ₂ , V ₃ ,...) Is stored in the curvature radius R (R ₁ , R ₂ ) in the metal plate processing data storage table 55 c of the data storage section 55 as shown in FIG. , R ₃ ,...).

  Here, as shown in FIG. 7, the second correlation data 55b has a relationship in which the rotational speed V increases as the radius of curvature R increases, and the rotational speed V decreases as the elastic coefficient E of the metal plate B increases. ing. By controlling in this way, even when the radius of curvature R of the metal plate B is large, the rotational speed V is slowed and the metal plate B and the three rolls 2 are difficult to slip. The second correlation data 55b is stored in advance in the data storage unit 55.

(Roll rotating means controller 54)
The roll rotation means control unit 54 plays a role of controlling the rotation speed V and the rotation amount of the servo motor 4. The roll rotation means controller 54 refers to the metal plate processing data storage table 55c based on the rotation amount of the three rolls 2 (that is, the feed amount of the metal plate B) transmitted from the amplifier 7 (feed amount measuring means). Thus, the rotational speed V corresponding to the radius of curvature R of the processed part of the current metal plate B is extracted. The roll rotation means control unit 54 transmits the extracted rotation speed V to the amplifier 7 and controls the rotation speed V of the servo motor 4.

  Further, the roll rotation means controller 54 refers to the metal plate processing data storage table 55c and rotates the servo motor 4 by an amount corresponding to the section length K corresponding to the current processing portion of the metal plate B. The rotation amount is controlled.

(Data storage unit 55)
The data storage unit 55 has a function of storing the first correlation data 55a, the second correlation data 55b, and the metal plate processing data storage table 55c (see FIG. 5), and is configured by a memory device or the like. ing. The data storage unit 55 can freely read / write the stored data in response to a request from the arithmetic unit.

(Feed amount correction unit 56)
The feed amount correction unit 56 compares the feed amount of the metal plate B measured from the rotation speed of the servo motor 4 with the feed amount of the metal plate B measured by the back gauge 6, and when both are different from each other. The function of correcting the feed amount of the metal plate B on the basis of the feed amount of the metal plate B measured by the back gauge 6 is assumed. Thereby, even when a slip occurs between the three rolls 2 and the metal plate B, the metal plate B can be reliably sent to the position where the next curvature radius R is changed. Therefore, the metal plate B can be processed with high accuracy. The corrected feed amount is sent to the feed amount determination unit.

(Feed amount determination unit 57)
The feed amount determination unit 57 has a function of determining whether or not the feed amount of the metal plate B has reached the full length of the metal plate B. The feed amount determination unit 57 is configured to send the determination result to the roll moving unit control unit 52 and the roll rotation unit control unit 53. When the feed amount of the metal plate B reaches the full length of the metal plate B, the roll moving means control unit 52 and the roll rotation means control unit 53 end the processing of the metal plate B. On the other hand, when the feed amount of the metal plate B does not reach the full length of the metal plate B, the roll moving unit control unit 52 and the roll rotation unit control unit 53 perform the roll interval D and rotation according to the next curvature radius R. The speed V is adjusted.

(Curvature radius determination unit 58)
The curvature radius determination unit 58 determines whether or not the curvature radius R at a predetermined position of the metal plate B after processing is equal to or less than a predetermined curvature radius. The radius-of-curvature determination unit 58 is interposed between the roll interval calculation unit 51 and the roll rotation speed calculation unit 53 and the input device 8. When the metal plate machining data is input from the input device 8, the curvature radius determination unit 58 determines whether or not the curvature radius R after machining of the metal plate B therein is equal to or less than a predetermined curvature radius. When the radius of curvature R is equal to or less than a predetermined radius of curvature, the radius of curvature R of that portion is output to the roll interval calculator 51 and the roll rotational speed calculator 53 as infinite (∞), that is, as a flat portion. It has become.

And the roll space | interval calculation part 51 calculates the roll space | interval D corresponding to the case where the curvature radius R is infinite. Further, the roll rotation speed calculation unit 53 calculates the roll rotation speed corresponding to the case where the radius of curvature R is infinite.
As the roll distance D corresponding to the case of the curvature radius R is infinite (if not performed bending), the radius of the first roll 2a r _1, the second roll 2b and the third roll 2c When the radius is r ₂ and the thickness of the metal plate B is t, the roll interval D = r ₁ + r ₂ + t is preferable. In this way, the metal plate B can be sent out without bending the metal plate B.

(Back gauge 6)
The back gauge 6 is a device that measures the distance between the rear end portion Ba of the metal plate B and the three rolls 2, and as shown in FIG. 1, the back gauge body 6a that drives on the rail 6c, and the back gauge body Gage portions 6b and 6b extending upward from the upper surface of 6a and abutting against the rear end portion Ba of the metal plate B are configured. When the metal plate B is fed by a predetermined length by the rotation of the three rolls 2, the back gauge 6 moves to a position where it abuts on the rear end portion Ba of the metal plate B, and The distance between the three rolls 2 is measured. The back gauge 6 calculates the feed amount of the metal plate B from the distance between the rear end portion Ba of the metal plate B and the three rolls 2 and the total length of the metal plate B, and transmits it to the control device 5. It is configured.

(Amplifier 7)
The amplifier 7 adjusts the rotation speed V and the rotation amount of the servo motor 4 and is interposed between the servo motor 4 and the control device 5. The amplifier 7 adjusts the rotation speed V and the rotation amount of the servo motor 4 based on a command from the roll rotation means control unit 54. The amplifier 7 detects the rotation amount of the servo motor 4, that is, the feed amount of the metal plate B, and transmits it to the control device 5.

(Input device 8)
The input device 8 is a device for inputting metal plate processing data. In addition to a keyboard and a mouse, the input device 8 may read an image with a scanner device or read data with a drive device. In the present embodiment, as the metal plate processing data, the elastic coefficient E of the metal plate B, the thickness t of the metal plate B, and the shape dimension of the metal plate B after processing are input. The input metal plate processing data is processed by the roll interval calculation unit 51 and the roll rotation speed calculation unit 53 and stored in the metal plate processing data storage table 55c.
Note that the elastic coefficient of the metal plate B may be indirectly input using the material of the metal plate B. Specifically, the relationship between the material of the metal plate B and the elastic coefficient is stored in the data storage unit 55 in advance, and the elastic coefficient of the metal plate B is automatically calculated from the input material of the metal plate B. You may comprise as follows.

(Output device 9)
The output device 9 includes a display device, and displays an input screen for metal plate processing data. Metal plate processing data is input based on the instructions on the input screen.

[Operation of metal plate processing apparatus 1]
It continues and demonstrates operation | movement of the metal plate processing apparatus 1. FIG. FIG. 3 is a flowchart showing the operation of the metal plate processing apparatus according to the present embodiment.

  First, using the input device 8, the elastic coefficient E of the metal plate B, the thickness t of the metal plate B, and the shape and size of the metal plate B after processing are input to the control device 5 (step S1). .

  When the metal plate machining data is input to the control device 5, the curvature radius determination unit 58 determines whether or not the radius of curvature Rn of each part is equal to or less than a predetermined curvature among the shape dimensions of the metal plate B after machining. Determine (step S2).

And when it determines with it being below a predetermined curvature (step S2, Yes), the curvature radius Rn of the said part is set to (infinity) (step S3). In other words, a portion that is processed to have a radius of curvature equal to or less than a predetermined curvature radius is regarded as not needing processing (is flat).
Further, for a portion larger than the predetermined radius of curvature, the processing is continued with the radius of curvature R (step S2, No).

Next, the roll interval calculation unit 51 receives the input elastic coefficient E of the metal plate B, the thickness t of the metal plate B, the shape dimension of the metal plate B after processing, and the first correlation data 55a stored in advance. Based on the above, the roll interval D is calculated for each curvature radius R of the metal plate B after processing (step S4).
The calculated roll interval D is associated with each curvature radius R and stored in the metal plate processing data storage table 55c.

When the metal plate processing data is input to the control device 5, the roll rotation speed calculation unit 53 stores the input elastic coefficient E of the metal plate B and the shape dimension of the metal plate B after processing in advance. Based on the second correlation data 55b, the rotational speed V of the three rolls 2 is calculated for each curvature of the metal plate B after processing (step S5).
The calculated rotation speed V is associated with each curvature radius R and stored in the metal plate processing data storage table 55c.

  Next, the feed amount of the metal plate B is measured (step S6). In the present embodiment, the feed amount of the metal plate B is measured from the rotation amount of the servo motor 4. The rotation amount of the servo motor 4 is sent from the amplifier 7 to the control device 5.

Next, the roll distance D is adjusted by the roll moving means controller 52 in accordance with the curvature radius R corresponding to the feed amount of the metal plate B (step S7). For example, when the measured feed amount of the metal plate B is zero, the corresponding radius of curvature R = R ₁ . Then, the roll moving means controller 52 sets the roll interval D = D ₁ corresponding to the curvature radius R ₁ .

Further, the rotation speed V of the three rolls 2 is adjusted by the roll rotating means controller 54 in accordance with the curvature radius R corresponding to the feed amount of the metal plate B (step S8). For example, when the measured feed amount of the metal plate B is zero, the corresponding radius of curvature R = R ₁ . Then, the roll rotating means control unit 54, is set to a rotational speed V = V ₁ corresponding to the radius of curvature R _1.

  In this embodiment, the roll interval D and the rotation speed V for each radius of curvature R are calculated in step S4 and step S5. However, the present invention is not limited to this, and the first correlation data 55a stored in advance is calculated. And the second correlation data 55b, the roll interval D and the rotation speed V may be calculated each time in steps S7 and S8.

When the setting of the roll interval D and the rotation speed V of the three rolls 2 is completed, the roll rotation means control unit 54 rotates the three rolls 2 at the set rotation speed V and changes to the next curvature radius R. The metal plate B is sent out (step S9). For example, when the current feed amount of the metal plate B is zero, the metal plate B is fed by the section length K ₁ . In this case, three-roll 2, because they are set to roll distance D ₁ which corresponds to the radius of curvature R _1, so that the curvature radius R ₁ of the curved surface is formed in a range of section length K _1. In addition, since the three rolls 2 are rotated at the rotation speed V ₁ corresponding to the curvature radius R ₁ , slip is unlikely to occur between the metal plate B and the three rolls 2.

At this time, in this embodiment, the section K ₉ corresponding to the front end face 13 of the windmill blade 10 corresponds to the front end face 13 when bending is performed in order from the section K ₁ as shown in FIG. When the section K ₉ is bent, the sections K _{1 to} K ₈ that have been processed are processed to have a radius of curvature R ₉ that hits the movable die 31 of the hydraulic press machine 3 of the metal plate processing apparatus 1. However, since it is considered that the radius of curvature R ₉ = ∞ in step S3, the section K ₉ is not bent and the metal plate B is sent out while being flat.
Further, the section K ₁₄ of the wind turbine blade 10 in the present embodiment is originally a flat portion and does not require processing. The metal plate processing apparatus 1 sends out the metal plate B while keeping such a portion flat without performing bending.

  When the feed amount of the metal plate B measured by the servo motor 4 becomes equal to the predetermined section length K, the feed amount of the metal plate B is measured by the back gauge 6 (step S10). That is, when the metal plate B is fed by a predetermined section length K, the back gauge 6 advances to a position where it abuts on the rear end portion Ba of the metal plate B, and the three rolls 2 and the rear end portion Ba of the metal plate B The interval is measured.

  Next, the feed amount correction unit 56 compares the feed amount of the metal plate B measured from the rotation amount of the servo motor 4 with the feed amount of the metal plate B measured by the back gauge 6. At this time, if slip occurs between the three rolls 2 and the metal plate B, the values of the two do not match. If the two values are different, the feed amount of the metal plate B is corrected based on the distance between the rear end Ba of the metal plate B and the three rolls 2 measured by the back gauge 6 (step). S11). If the difference between the two is equal to or less than the allowable error, it is determined that the two values are equal. In the case of processing the windmill blade 10, the tolerance is preferably about ± 5 mm.

  When the feed amount is corrected by the feed amount correction unit 56 (Yes in step S11), the process returns to step S9, and the metal plate B is further fed to the position where the next curvature radius R is changed. Steps S9 to S11 are repeated until the feed amount measured by the back gauge 6 becomes equal to the feed amount measured by the servo motor 4.

When the feed amount is not corrected by the feed amount correction unit 56, that is, when the feed amount measured by the back gauge 6 becomes equal to the feed amount measured by the servo motor 4 (No in step S11), the feed amount determination It is determined by the part 57 whether all the metal plates B have been sent (step S12). If all the metal plates B are not fed (No at Step S12), the process returns to Step S7, and the three rolls 2 are set at the roll interval D and the rotation speed V corresponding to the next radius of curvature R. For example, when the feed amount of the metal plate B at this time is L ₁ , the roll interval D = D ₂ and the rotation speed V = V ₂ are set in accordance with the curvature radius R ₂ to be processed next. .

On the other hand, when the feed amount of the metal plate B is equal to the total length L ₁₄ of the metal plate B (see FIG. 5), it is determined that all the metal plates B have been sent and the processing is finished (step S12, Yes). Processing of the metal plate B by the metal plate processing apparatus 1 is completed.

Next, the metal plate B is installed in another metal plate processing apparatus (not shown) that does not interfere with the processed portion, and the bending process is performed on the section K ₉ where the bending process is postponed (step S13). Thereby, manufacture (bending process) of the blade 10 for windmills is completed.

  As mentioned above, although the best form for implementing this invention was demonstrated in detail with reference to drawings, this invention is not limited to this embodiment, It can change suitably.

  For example, in the present embodiment, the case where the metal plate processing apparatus according to the present invention is applied to the manufacture of the wind turbine blade 10 of the wind power generator has been described. However, the present invention is not limited to this, and curved surfaces having different curvatures are used. Needless to say, the present invention is applicable to processing of a continuous metal plate.

  Further, in the present embodiment, the hydraulic press machine 3 is used as the moving means of the three rolls 2, but the present invention is not limited to this, and any method can be used as long as it can be controlled by a computer. Various moving means may be used.

  In the present embodiment, the actual feed amount of the metal plate B is measured by the back gauge 6 and the feed amount measured by the servo motor 4 is corrected. However, the metal plate B, the three rolls 2, If no slip occurs between the two, this function may be omitted.

It is the perspective view which showed the structure of the metal plate processing apparatus which concerns on this embodiment. It is the block diagram which showed the metal plate processing apparatus which concerns on this embodiment. It is the flowchart which showed operation | movement of the metal plate processing apparatus which concerns on this embodiment. It is the side view which showed the shape of the blade for windmills. It is the figure which showed an example of the metal plate processing data storage table. It is the conceptual diagram which showed the correlation data with the elastic modulus of a metal plate, the curvature radius of a metal plate, and a roll space | interval. It is the conceptual diagram which showed the correlation data with the elastic modulus of a metal plate, the curvature radius of a metal plate, and the rotational speed of three rolls.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal plate processing apparatus 2 3 rolls 3 Hydraulic press machine (roll moving means)
4 Servo motor (roll rotation means)
5 Control device (control means)
51 Roll Interval Calculation Unit 52 Roll Movement Unit Control Unit 53 Roll Rotation Speed Calculation Unit 54 Roll Rotation Unit Control Unit 55 Data Storage Unit 55a First Correlation Data 55b Second Correlation Data 55c Metal Plate Processing Data Storage Table 56 Feed Amount Correction Unit 57 Feed amount determination unit 58 Curvature radius determination unit 6 Back gauge 7 Amplifier 8 Input device 9 Output device 10 Windmill blade 11 Upper surface 12 Lower surface 13 Front end surface B Metal plate D Roll interval R Curvature radius V Rotational speed

Claims (7)

A metal plate processing apparatus for continuously forming curved surfaces with different curvature radii on a metal plate,
Three rolls arranged parallel to each other and rotatably supported at the position of each vertex of the triangle when viewed from the side;
Roll moving means for bringing the roll interval between one roll of the three rolls and the middle position of the other two rolls close to each other;
Roll rotating means for rotating at least one of the three rolls;
A feed amount measuring means for measuring a feed amount of the metal plate inserted between the one roll and the other two rolls;
Control means for controlling the roll rotating means and the roll moving means;
Input means for inputting metal plate processing data relating to the processing of the metal plate to the control means,
The metal plate processing data includes a thickness of the metal plate, an elastic coefficient of the metal plate, and a radius of curvature at a predetermined position of the metal plate after processing,
The control means includes
Based on the metal plate processing data, for each radius of curvature at a predetermined position of the metal plate after processing, the rotational speed of the three rolls and the roll interval are calculated,
The roll rotation unit and the roll moving unit are controlled based on the feed amount of the metal plate measured by the feed amount measurement unit and the calculated rotation speed and roll interval. Metal plate processing equipment. The control means includes
When the curvature radius at a predetermined position of the metal plate after processing is equal to or less than a predetermined curvature radius, the roll interval is calculated by regarding the curvature radius at the predetermined position as infinite. Item 2. The metal plate processing apparatus according to Item 1. The control means includes
Based on the metal plate processing data input from the input means, and the correlation data of the elastic coefficient of the metal plate, the radius of curvature of the metal plate and the roll interval stored in advance, the metal plate after processing is processed. For each radius of curvature at a predetermined position, a roll interval calculator that calculates the roll interval;
Based on the roll interval calculated by the roll interval calculation unit and the feed amount of the metal plate measured by the feed amount measuring unit, a roll moving unit control unit that controls the roll moving unit;
Based on the metal plate processing data input from the input means, and the correlation data between the elastic coefficient of the metal plate, the radius of curvature of the metal plate and the rotation speed of the three rolls stored in advance, after processing A roll rotation speed calculation unit for calculating a rotation speed of the three rolls for each radius of curvature at a predetermined position of the metal plate;
Roll rotation for controlling the roll rotation means based on the rotation speed of the three rolls calculated by the roll rotation speed calculation unit and the feed amount of the metal plate measured by the feed amount measurement means. The metal plate processing apparatus according to claim 1, further comprising a means control unit.   The roll moving means is a hydraulic press machine having a movable mold and a fixed mold, and one of the one roll and the two rolls is rotatably fixed to the movable mold. 4. The metal plate processing apparatus according to claim 1, wherein the other is rotatably fixed to the fixed mold. 5. The roll rotating means comprises a servo motor,
5. The metal plate processing apparatus according to claim 1, wherein the feed amount measuring unit measures a feed amount of the metal plate based on a rotation amount of the servo motor. . A back gauge for measuring a distance between a rear end portion of the metal plate and the three rolls;
The control means includes
Comparing the feed amount of the metal plate measured by the feed amount measuring means with the distance between the rear end of the metal plate and the three rolls measured by the back gauge;
6. The feed amount of the metal plate is corrected based on a distance between a rear end portion of the metal plate and the three rolls measured by the back gauge when they are different. The metal plate processing apparatus as described in. An airfoil is constituted by an upper surface and a lower surface in which curved surfaces having a curvature radius larger than a predetermined curvature radius are continuous, and a front end surface that connects the upper surface and the lower surface and has a curved surface having a predetermined curvature radius or less. A method of manufacturing a blade for a windmill,
Forming the upper surface and the lower surface on the metal plate using the metal plate processing apparatus according to claim 2;
And then forming the front end surface using another metal plate processing apparatus,
The predetermined radius of curvature is a radius of curvature at which a processed portion of the metal plate interferes with the metal plate processing apparatus according to claim 2 when a part of the metal plate is processed with the radius of curvature.
The other metal plate processing apparatus is configured to have a shape in which a processed portion of the metal plate does not interfere even when the metal plate is processed with the predetermined radius of curvature. Production method.

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