JP6474308B2 - Manufacturing apparatus and manufacturing method for automobile wheel rim - Google Patents

Description

  The present invention relates to a technique for manufacturing an automobile wheel rim.

  2. Description of the Related Art Conventionally, there has been known a technique for roll forming using a roll mold in which an annular rim work is arranged on each of the outer periphery side and the inner periphery side of a rim work. An example of this type of technology is disclosed in Patent Documents 1 and 2 below. According to the technique disclosed in Patent Document 1, a top roll type (simply referred to as “top roll”) disposed on the rim work outer peripheral side and a bottom roll type (simply referred to as “bottom roll”) disposed on the rim work inner peripheral side. ) And the pressure and rotation are controlled so as to meet the optimum pressure and rotation conditions of each roll mold. According to the technique disclosed in Patent Document 2, in roll forming using a top roll type arranged on the outer peripheral side of the rim work and a bottom roll type arranged on the inner peripheral side of the rim work, depending on the position of the top roll type relative to the bottom roll type Thus, the rotational speed of at least one of the roll molds is controlled.

JP 58-93535 A JP-A-2-80143

  By the way, in the above-mentioned roll forming, when increasing the clamping force in the state where the inner and outer circumferences of the rim work are sandwiched between the top roll mold and the bottom roll mold, both roll molds are used so that the interval between both roll molds is gradually reduced. Is controlled. According to this control, when the clamping force increases, it is assumed that the rotation speed of each roll type decreases due to the resistance received from the rim work. Therefore, when the interval between the roll dies is reduced despite the decrease in the rotation speed of each roll dies, unevenness is formed in the circumferential direction of the rim work by receiving a local load in the circumferential direction of the rim work. Is done. As a result, variations in the dimensions of the rim workpieces occur, which may hinder stable rim workpiece roll forming.

  The present invention has been made in view of the above points, and one of its purposes is to provide a technique effective for stably performing roll forming of an annular rim work in the manufacture of an automobile wheel rim. is there.

  In order to achieve the above object, an automobile wheel rim manufacturing apparatus (100) according to the present invention includes a first roll type (150) in which an annular rim work (W) is arranged on the rim work outer peripheral side and an inner rim work inner side. It is a manufacturing apparatus for roll-forming using both the 2nd roll type | mold (160) arrange | positioned. The manufacturing apparatus (100) includes a first drive mechanism (120), a second drive mechanism (130, 140), an interval adjusting servo motor (110), and a control device (170). The first drive mechanism (120) rotationally drives the first roll mold (150). The second mobile mechanism (130, 140) rotates the second roll mold (160). The interval adjusting servo motor (110) adjusts at least one of the first roll type (150) and the second roll type (160) between the two roll types (also referred to as "distance" or "gap"). Drive in the direction. The control device (170) controls the total rotation angle from the roll forming initial stage of at least one of the first roll mold (150) and the second roll mold (160) and the first roll mold (150) and the second roll mold (160). Based on a predetermined correlation (MP1) with respect to a parameter related to the interval between the roll dies (160), the interval adjusting servo motor (110) is feedback-controlled so that the parameter becomes a target value corresponding to the total rotation angle. To do. As the “parameter” here, typically, the distance between the first roll type (150) and the second roll type (160) and the relative relationship between the first roll type (150) and the second roll type (160). The position (for example, the position of at least one of the first roll mold (150) and the second roll mold (160)) can be mentioned.

  According to said manufacturing apparatus, the space | interval between both roll type | molds can be controlled to an appropriate value according to the total rotation angle of at least one roll type of a 1st roll type | mold and a 2nd roll type | mold. Thereby, it can suppress that the rotation speed of both roll type | molds falls by narrowing the space | interval between both roll type | molds more than necessary. In this case, the interval between both roll dies does not shrink regardless of the decrease in the rotational speed of both roll dies. As a result, it is possible to suppress the formation of irregularities in the circumferential direction of the rim work by receiving a local load in the circumferential direction of the rim work, and to stably perform rim work roll forming by suppressing variation in the dimensions of the rim work. It becomes possible.

  In the present invention, the first drive mechanism (120) is configured to detect the rotation angle of the first motor shaft (121) that rotates integrally with the first roll mold (150). The second drive mechanism (130, 140) includes a motor (120), and is configured to be able to detect the rotation angle of the second motor shaft (131, 141) that rotates integrally with the second roll mold (160). It is preferable to provide a servo motor (130, 140) for rotational driving. Furthermore, the control device (170) controls the rotation angle of the first motor shaft (121) detected by the first rotation drive servomotor (120) and the first rotation angle during the feedback control of the interval adjustment servomotor (110). It is preferable to derive the total rotation angle using at least one of the rotation angles of the second motor shafts (131, 141) detected by the two rotation driving servomotors (130, 140).

  According to this manufacturing apparatus, in order to derive the total rotation angle of at least one of the first roll type and the second roll type, the interval at which the position detection means for detecting the rotation angle of the motor shaft is mounted. Since an adjustment servo motor is used, it is not necessary to provide a separate position detecting means, and it is possible to construct a system that is structurally simple and inexpensive. Further, by using a servo motor for adjusting the distance for driving control of the top roll type and the bottom roll type, the rotational position and the number of rotations of the top roll type and the bottom roll type are controlled with high accuracy, and the top roll type and Acceleration / deceleration can be promptly performed for each of the bottom roll types. As a result, it is possible to shorten the processing time (cycle time) required for roll forming of the rim work.

  In order to achieve the above object, a method for manufacturing a wheel rim for an automobile according to the present invention includes a first roll type (150) in which an annular rim work (W) is arranged on the rim work outer peripheral side and a first roll type (150) arranged on the rim work inner peripheral side. A step of roll forming using both the two-roll mold (160). In this manufacturing method, the rim work (W) is rotated by the first roll mold (150) and the second roll mold (160) while rotating each of the first roll mold (150) and the second roll mold (160) during roll forming. While sandwiched, at least one of the first roll type (150) and the second roll type (160) is driven in the direction of adjusting the interval between the two roll types by the interval adjusting servo motor (110), and the first roll Parameters relating to the total rotation angle from the initial roll forming of at least one of the mold (150) and the second roll mold (160) and the distance between the first roll mold (150) and the second roll mold (160) On the basis of a predetermined correlation (MP1) with respect to the interval adjusting servo motor ( 10) the feedback control of the.

  According to said manufacturing method, as a result of being able to control the space | interval between both roll type | molds to an appropriate value according to the total rotation angle of at least one roll type | mold of a 1st roll type | mold and a 2nd roll type | mold, Roll forming can be performed stably.

  In the above description, in order to help the understanding of the invention, the reference numerals used in the embodiments are attached to the configuration of the invention corresponding to the embodiment in parentheses, but each constituent element of the invention is the reference numeral. It is not limited to the embodiment defined by.

  As described above, according to the present invention, it is possible to stably roll-form an annular rim work in manufacturing a wheel rim for an automobile.

FIG. 1 is a diagram schematically showing an outline of a roll forming apparatus as an automobile wheel rim manufacturing apparatus. FIG. 2 is a diagram showing a cross-sectional structure of a rim work sandwiched between a top roll type and a bottom roll type. FIG. 3 is a diagram showing a flowchart of a roll forming method using the roll forming apparatus in FIG.

  Hereinafter, an embodiment of a wheel rim manufacturing apparatus for manufacturing an automobile wheel rim (hereinafter also simply referred to as “wheel rim”) of the present invention will be described in detail with reference to the drawings. In the drawing, the vertical direction (vertical direction) of the wheel rim manufacturing apparatus is indicated by an arrow X, and the horizontal direction (horizontal direction) of the wheel rim manufacturing apparatus is indicated by an arrow Y.

  As shown in FIG. 1, a roll forming apparatus 100 as a wheel rim manufacturing apparatus includes a metal frame member 101 to which a plurality of components are assembled. The frame member 101 includes a base 101a placed on the placement surface M, an upper support base 101b disposed above the base 101a, and a guide frame 101c that connects the base 101a and the upper support base 101b. I have. The guide frame 101c is configured to be able to guide the movable support base 102 disposed between the base 101a and the upper support base 101b in the vertical direction X.

  A third servo motor 110 is fixed to the upper support base 101b. A drive gear 112 fixed to the motor shaft 111 of the third servo motor 110 is engaged with a driven gear 113 fixed to a power transmission shaft 114 extending in parallel with the motor shaft 111. The power transmission shaft 114 is supported by the upper support base 101b through a bearing 115 so as to be rotatable about its axis. A male screw portion 116 made of a helical thread is provided at the lower part of the power transmission shaft 114, while the male hole of the power transmission shaft 114 is inserted into the through hole of the bracket 103 fixed to the upper surface of the movable support base 102. A female screw portion 104 that is screwed with the screw portion 116 is provided. The female screw portion 104 and the male screw portion 116 slide the power transmission shaft 114 in the vertical direction X with respect to the bracket 103 together with a plurality of steel balls (not shown) filled between the female screw portion 104 and the male screw portion 116. A structure to be moved, that is, a so-called “ball screw mechanism” is configured. According to this ball screw mechanism, it is possible to realize an operation in which the power transmission shaft 114 slides smoothly by suppressing the frictional resistance using the rolling motion of the steel ball.

  According to this ball screw mechanism, the third servomotor 110 rotates the power transmission shaft 114 via the drive gear 112 and the driven gear 113, so that the movable support base 102 moves in the vertical direction X. For example, when the third servo motor 110 is controlled so that the motor shaft 111 rotates in a predetermined direction, the movable support base 102 moves up. On the other hand, when the third servo motor 110 is controlled so that the motor shaft 111 rotates in the direction opposite to the predetermined direction, the movable support base 102 moves downward. That is, the rotational movement of the drive gear 112 by the third servo motor 110 is converted into a linear lifting movement in the vertical direction X of the movable support base 102 via the driven gear 113 and the power transmission shaft 114.

  The third servo motor 110 is configured as a servo mechanism type electric motor equipped with an encoder 110a capable of detecting the rotation angle (motor rotation position) of the motor shaft 111. Accordingly, the third servo motor 110 outputs detection information from the encoder 110a to the control device 170 and is driven and controlled by a control signal output from the control device 170. Specifically, the control device 170 controls control parameters such as the start and stop timings, the rotation direction, and the rotation speed of the third servo motor 110. The control device 170 includes output means for inputting / outputting detection signals and control signals, arithmetic processing means (CPU) for calculating information, storage means (memory) for storing input signals and calculation results, and the like. It is configured as a known control device provided. This control device 170 corresponds to the “control device” of the present invention. The control device 170 includes a gear ratio between the drive gear 112 and the driven gear 113, a pitch distance between the threads 116, a rotation angle of the third servo motor 110, and a vertical position X ascending / descending position of the top roll mold 150 described later. By storing the initial information indicating the correlation in advance, the elevation position of the top roll mold 150 can be uniquely derived from the motor rotation angle of the third servo motor 110. In short, the encoder 110a of the third servo motor 110 serves to indirectly derive the elevation position of the top roll mold 150 and output it to the control device 170.

  On the lower surface of the movable support 102, a support arm 105 that supports a rotary shaft 151 of a top roll type (simply referred to as “top roll”) 150 as a first roll type so as to be rotatable about an axis, and a rotary shaft 151. A first servo motor 120 including a motor shaft 121 connected coaxially is fixed. The motor shaft 121 is configured to rotate integrally with the top roll mold 150, and the top roll mold 150 rotates about the axis together with the motor shaft 121 when the first servo motor 120 operates. The first servo motor 120 is a rotation driving servo motor that rotationally drives the top roll mold 150, and constitutes the “first driving mechanism (first rotation driving servo motor)” of the present invention. Similar to the third servo motor 110, the first servo motor 120 is configured as a servo mechanism type electric motor equipped with an encoder 120a capable of detecting the rotation angle (motor rotation position) of the motor shaft 121. Accordingly, the first servo motor 120 outputs detection information from the encoder 120 a to the control device 170 and is driven and controlled by a control signal output from the control device 170. The top roll mold 150 is a cylindrical metal member used for roll forming the annular rim work W, and is disposed on the rim work outer peripheral side of the rim work W. The rim work W is a cylindrical metal member before the wheel rim is formed, and is typically formed by butting both ends of a plate after a metal plate piece is rounded into a ring.

  On the upper surface of the base 101a, a movable device 132 that supports the second A servo motor 130 so as to be slidable in the left-right direction Y and a movable device 142 that supports the second B servo motor 140 so as to be slidable in the left-right direction Y are It is provided in a state separated in the direction Y. The movable device 132 outputs information related to the slide position of the second A servomotor 130 in the left-right direction Y to the control device 170 and drives the second A servomotor 130 in the left-right direction Y by a control signal output from the control device 170. . According to this movable device 132, the 2A servo motor 130 is linear between the first position (roll processing position indicated by a solid line) and the second position (retracted position indicated by a two-dot chain line) in FIG. Can be moved to. Similar to the movable device 132, the movable device 142 outputs information regarding the slide position of the second B servo motor 140 in the left-right direction Y to the control device 170, and the second B servo motor 140 is controlled by a control signal output from the control device 170. Is driven in the left-right direction Y. According to this movable device 142, the 2B servo motor 140 is linear between the first position (roll processing position indicated by a solid line) and the second position (retracted position indicated by a two-dot chain line) in FIG. Can be moved to.

  A left divided bottom roll 161 constituting a left region of a bottom roll type (simply referred to as “bottom roll”) 160 which is a second roll type is fixed to the motor shaft 131 of the second A servomotor 130. Similarly, a right divided bottom roll 162 constituting the right region of the bottom roll mold 160 is fixed to the motor shaft 141 of the second B servo motor 140. When the second A servo motor 130 is in the second position, the left divided bottom roll 161 is supported in a cantilever manner by the motor shaft 131. When the second B servo motor 140 is in the second position, the right divided bottom roll 162 is supported in a cantilever manner by the motor shaft 141. On the other hand, when the left divided bottom roll 161 and the right divided bottom roll 162 are set close to each other and set to the first positions by the movable devices 132 and 142, the opposing surfaces are abutted and engaged with each other. As a result, a bottom roll mold 160 disposed opposite to the top roll mold 150 is formed. In this case, the bottom roll type 160 is a right / left split type (left / right separation type) roll type, and is supported by both the motor shaft 131 and the motor shaft 141 in a supported manner. The motor shafts 131 and 141 are configured to rotate integrally with the bottom roll mold 160, and the bottom roll mold 160 rotates about the axis together with the motor shafts 131 and 141 when the servo motors 130 and 140 are operated. The second A servo motor 130 and the second B servo motor 140 are rotational drive servo motors that rotationally drive the bottom roll type 160, and constitute the “second drive mechanism (second rotational drive servo motor)” of the present invention. doing. The bottom roll mold 160 is a cylindrical metal member used for roll forming of the rim work W, and is disposed on the rim work inner peripheral side of the rim work W.

  Servo motors 130 and 140 are servo mechanism type electric motors equipped with encoders 130a and 140a, respectively, capable of detecting the rotation angles (motor rotation positions) of motor shafts 131 and 141, similarly to servo motors 110 and 120 described above. It is configured as a motor. For this reason, the second A servomotor 130 outputs detection information from the encoder 130 a to the control device 170 and is driven and controlled by a control signal output from the control device 170. Similarly, the second B servo motor 140 outputs information detected by the encoder 140 a to the control device 170 and is driven and controlled by a control signal output from the control device 170.

  During roll forming of the rim work W, the second A servo motor 130 and the second B servo motor 140 are controlled such that the left divided bottom roll 161 and the right divided bottom roll 162 rotate in the same direction and at the same speed. In this case, the second A servo motor 130 and the second B servo are adjusted so that both the rotation speed detected by the encoder 130a of the third servo motor 130 and the rotation speed detected by the encoder 140a of the second B servo motor 140 coincide with each other. The motor 140 is feedback controlled. As a result, the bottom roll mold 160 formed by the left divided bottom roll 161 and the right divided bottom roll 162 rotates. Further, when the rim work W is formed by the roll, the top roll mold 150 is opposite to the bottom roll mold 160 in the same direction. The first servo motor 120 is controlled to rotate at a speed. In this case, for example, the first servomotor 120 performs feedback control so that both the rotational speed detected by the encoder 130a of the second A servomotor 130 and the rotational speed detected by the encoder 120a of the first servomotor 120 coincide. Is done.

  Next, a wheel rim manufacturing method using the roll forming apparatus 100 having the above-described configuration will be described with reference to FIGS. 2 and 3 in addition to FIG. This manufacturing method includes a step of performing flare processing and a step of performing multi-stage (typically three-stage) roll forming (also referred to as “roll processing”). The flare processing is a known processing technique and will not be described in detail, but is a technique in which both end opening edges of a metal cylindrical body are sandwiched between a pair of frusto-conical flaring molds and pressed. By subjecting the annular rim work W obtained by this flare processing to roll forming in a plurality of stages, the wheel rim shape is gradually adjusted to suppress the occurrence of plate sinks and wrinkles.

  In each of the multiple stages of roll forming, as particularly referring to FIG. 2, a top roll mold 150 in which the rim work W is disposed on the outer periphery side of the rim work and a bottom roll mold 160 (left divided bottom) disposed on the inner periphery side of the rim work. Each of the top roll mold 150 and the bottom roll mold 160 is rotated in the opposite direction while being sandwiched between both the roll 161 and the bottom roll mold integrally formed by the right divided bottom roll 162. At this time, as indicated by an arrow in FIG. 2, the third servomotor 110 moves the distance between the two roll dies 150, 160 (“distance” or “ It is driven in the adjustment direction (vertical direction X). The third servo motor 110 is an electric motor for adjusting the distance that drives the top roll mold 150 in the adjustment direction (vertical direction X) of the distance between the roll molds 150 and 160 (roll mold interval) d. The third servo motor 110 is controlled so that the distance d is lowered, so that the interval d is adjusted to be gradually reduced. The third servo motor 110 here corresponds to the “interval adjusting servo motor” of the present invention. In this case, the rim work W is rolled such that the rim work outer peripheral surface Wa follows the shape of the mold surface of the top roll mold 150 and the rim work inner peripheral surface Wb follows the shape of the mold surface of the bottom roll mold 160. . As a result, a wheel rim having a desired shape and dimension can be obtained.

  In each roll forming, when increasing the clamping force with the top roll mold 150 and the bottom roll mold 160 sandwiching the rim work outer peripheral surface Wa and the rim work inner peripheral surface Wb, both roll molds 150, 160 are used. The position of the top roll mold 150 is controlled so that the interval d between them gradually decreases. Alternatively, when reducing the clamping force, the position of the top roll mold 150 is controlled so that the distance d between the roll molds 150 and 160 gradually increases.

  By the way, according to the control for shortening the interval d, when the clamping force is increased, the rotation speed (change amount of the rotation angle per unit time) of each roll type is reduced by the resistance received from the rim work W. Therefore, when the interval d between the two roll dies 150 and 160 is reduced despite the decrease in the rotation speed of each roll dies, the rim work W receives a local load in the circumferential direction thereof, thereby causing the rim work W to Unevenness in the circumferential direction is formed. As a result, the roll forming of the rim work W can be prevented from being stably performed.

  Therefore, in the present embodiment, the controller 170 first adjusts the rotation speed of each roll mold to an appropriate rotation speed during roll forming, first, the total rotation angle (top roll from the start of roll forming of the top roll mold 150). The correlation between the absolute rotation angle of the mold 150) and a parameter relating to an appropriate distance d between the two roll molds 150 and 160 is set in advance. Then, the control device 170 feedback-controls the third servo motor 110 so that the target value of the parameter corresponding to the appropriate interval d is realized. Here, “appropriate distance d” means that when the top roll mold 150 is lowered toward the bottom roll mold 160 in the initial stage of roll forming, the rotational speed of the top roll mold 150 is significantly lower than that of the bottom roll mold 160. Or when the top roll mold 150 is lifted away from the bottom roll mold 160 in the latter stage of roll forming, the phenomenon that the rotational speed of the top roll mold 150 is significantly increased compared to the bottom roll mold 160 is suppressed. Defined as a valid interval. Alternatively, the “appropriate distance d” here refers to the rotation speed of the top roll mold 150 assumed in advance when the top roll mold 150 is lowered toward the bottom roll mold 160 in the initial stage of roll forming. When the top roll mold 150 is lifted away from the bottom roll mold 160 in the later stage of roll forming, the rotation speed of the top roll mold 150 is significantly higher than the rotation speed assumed in advance. It is defined as an interval that is effective in suppressing the phenomenon that occurs. An example of the roll forming method at this time will be described with reference to FIG. In the following description, for the sake of convenience, the description of the control device 170 that is the control subject is omitted.

  As shown in FIG. 3, the process proceeds to step S102 on condition that the start of roll forming is detected in step S101. In step 102, the total rotation angle θ of the top roll mold 150 is detected. In this case, the total rotation angle θ of the top roll mold 150 is derived from the rotation angle of the motor shaft 121 detected using the encoder 120a of the first servo motor 120. In step S103, the appropriate lifting position of the top roll mold 150 corresponding to the total rotation angle θ detected in step 102, that is, the target lifting position Pt to be targeted is stored in the storage means (memory) of the control device 170. It is determined based on the predetermined map MP1. This map MP1 shows the correlation between the total rotation angle of the top roll mold 150 and the elevation position of the top roll mold 150. As this map MP1, an optimum one is appropriately extracted from a plurality of mapping data in accordance with operating conditions and the like. According to this map MP1, the elevation position of the top roll mold 150 changes in conjunction with the change in the rotation angle of the top roll mold 150 (also referred to as “synchronization”). In this case, the elevation position of the top roll mold 150 is the position of the motor shaft 121 of the first servomotor 120 with respect to the position of the motor shaft 131 of the second A servomotor 130 or the motor shaft 141 of the secondB servomotor 140. In the roll forming apparatus 100 of the present embodiment, the position of the bottom roll mold 160 is fixed in the vertical direction X, and the elevation position of only the top roll mold 150 of the top roll mold 150 and the bottom roll mold 160 is adjusted. The Therefore, the raising / lowering position of the top roll mold 150 corresponds to the distance d between the two roll molds 150 and 160, and is a parameter relating to the distance d.

  In the map MP1, the target lift position is determined as Pta when the total rotation angle detected in step S103 is, for example, θa. In this case, the target lifting position Pta corresponds to the optimum value da of the distance d between the two roll dies 150 and 160 when the total rotation angle is θa. Therefore, if the elevation position of the top roll mold 150 can be controlled to the target elevation position Pta in a state where the total rotation angle θ of the top roll mold 150 is known, the distance d between the two roll molds 150 and 160 is appropriately controlled. it can. The target lifting position Pta is preliminarily set with respect to a first correlation set in advance with respect to the relationship between the total rotation angle θ of the top roll mold 150 and the optimum distance d, and with respect to the relationship between the distance d and the lifting position P of the top roll mold 150. It is determined based on both of the set second correlations. For example, the optimum interval da corresponding to the total rotation angle θa is derived based on the first correlation. Next, the elevation position Pa of the top roll mold 150 corresponding to the interval da is derived based on the second correlation. This lift position Pa of the derived top roll mold 150 becomes the target lift position Pta.

  In step S104, the actual lift position P of the top roll mold 150 is detected. In step S105, the lift position P detected in step S104 is compared with the target lift position Pt. In step S106, the third servo motor 110 is driven and controlled so that the lift position P matches the target lift position Pt. According to this control, a series of processes from step S104 to step S106 are repeated until the lift position P matches the target lift position Pt. That is, the third servo motor 110 is feedback-controlled so that the raising / lowering position P of the top roll mold 150 follows the target raising / lowering position Pt which is a target value corresponding to the total rotation angle θ. The raising / lowering position P of the top roll mold 150 is indirectly determined from the number of revolutions detected by the encoder 110a of the third servo motor 110 by using the above-described initial information stored in advance in the storage means (memory) of the control device 170. To be derived. In this case, the followability to the map MP1 can be improved by executing feedback control using the third servo motor 110.

  According to the roll forming apparatus 100 and the roll forming method of the present embodiment described above, the distance between the two roll molds 150 and 160 can be controlled to an appropriate value according to the total rotation angle of the top roll mold 150. As a result, the number of rotations of the top roll mold 150 is reduced by lowering the top roll mold 150 more than necessary at the initial stage of roll forming, that is, by making the distance between the two roll molds 150 and 160 excessively narrow. Can be suppressed. In this case, the distance between the two roll molds 150 and 160 does not shrink regardless of the decrease in the rotational speed of the top roll mold 150. As a result, it is possible to prevent the rim work W from receiving a local load in the circumferential direction and to form irregularities in the circumferential direction of the rim work W. It becomes possible to carry out stably. Further, it is possible to suppress the top roll mold 150 from idling by raising the top roll mold 150 more than necessary in the latter stage of roll forming, that is, by increasing the distance between the two roll molds 150 and 160 more than necessary.

  Further, in the present embodiment, the first servo motor 120 on which the encoder (position detection means) 120a for detecting the rotation angle of the motor shaft 121 is used to derive the total rotation angle of the top roll mold 150, There is no need to separately provide a position detecting means, and it is possible to construct a system that is structurally simple and inexpensive. Further, by using a servo motor for driving control of the top roll mold 150 and the bottom roll mold 160, the rotational position and the number of rotations of the top roll mold 150 and the bottom roll mold 160 are controlled with high accuracy, and the top roll mold is used. Acceleration / deceleration can be performed quickly for each of the 150 and the bottom roll mold 160. As a result, it is possible to shorten the processing time (cycle time) required for roll forming the rim work W.

  The present invention is not limited to the above-described exemplary embodiments, and various applications and modifications can be considered without departing from the object of the present invention. For example, each of the following embodiments to which the above embodiment is applied can be implemented.

  In the above embodiment, the case where only the top and bottom roll molds 150 are adjusted in the roll forming process is described. However, in the present invention, the top roll mold and the bottom roll mold are selected. The structure which adjusts the raising / lowering position of at least one roll type | mold can be employ | adopted.

  In the above embodiment, the case where the elevation position of the top roll mold 150 is used as a parameter related to the distance between the two roll molds 150 and 160 (vertical axis of the map MP1 in FIG. 3) has been described. It is also possible to use parameters other than the lift position of the top roll mold 150. For example, in the structure in which the elevation position of only the bottom roll mold 160 of the top roll mold 150 and the bottom roll mold 160 is adjusted, the elevation position of the bottom roll mold 160 can be used as the parameter. In the structure in which the elevation positions of both the top roll mold 150 and the bottom roll mold 160 are adjusted, the elevation positions of the both roll molds 150 and 160 can be used as the parameters. Moreover, the space | interval itself between both roll type | molds 150 and 160 can also be used as the said parameter.

In the above embodiment, the case where the total rotation angle of the top roll mold 150 is detected during roll forming and used for feedback control of the third servo motor 110 has been described, but in the present invention, the total rotation angle of the top roll mold 150 is used. Alternatively, a structure in which the total rotation angle of the bottom roll mold 160 is detected and used for feedback control of the third servo motor 110 may be employed.
Alternatively, in the present invention, it is possible to employ a structure that is used for feedback control of the third servo motor 110 by detecting both the total rotation angle of the top roll mold 150 and the total rotation angle of the bottom roll mold 160 during roll forming.

  In the above embodiment, the case where both the top roll mold 150 and the bottom roll mold 160 are rotationally driven by the servo motor has been described. However, in the present invention, the top roll mold 150 and the bottom roll mold 160 are used as electric motors other than the servo motor. It is also possible to adopt a structure that is driven to rotate.

  In the above embodiment, the case where the left and right split type roll roll configured by the left split bottom roll 161 and the right split bottom roll 162 is used as the bottom roll mold 160 is described, but in the present invention, one bottom roll mold is used. A roll type can also be used. Further, in the present invention, when a left-right split roll type is used as the bottom roll type, a servo motor is assigned to only one of the left and right split rolls instead of assigning a servo motor to each of the left and right split rolls. A structure can be adopted.

  DESCRIPTION OF SYMBOLS 100 ... Roll forming apparatus, 110 ... 3rd servo motor, 120 ... 1st servo motor, 130 ... 2A servo motor, 140 ... 2B servo motor, 150 ... Top roll type, 160 ... Bottom roll, 161 ... Left division bottom Roll, 162 ... right-side divided bottom roll, 170 ... control device, W ... rim work

Claims (3)

An apparatus for manufacturing a wheel rim for an automobile for roll forming using both a first roll type in which an annular rim work is arranged on the outer peripheral side of the rim work and a second roll type arranged on the inner peripheral side of the rim work,
A first drive mechanism for rotationally driving the first roll mold;
A second maneuvering mechanism for rotating the second roll mold;
An interval adjusting servomotor that drives at least one of the first roll type and the second roll type in an adjustment direction of the interval between the two roll types;
The total rotation angle from the initial roll forming of at least one of the first roll mold and the second roll mold and the parameter relating to the interval between the first roll mold and the second roll mold are determined in advance. A control device that feedback-controls the servomotor for adjusting the interval so that the parameter becomes a target value corresponding to the total rotation angle based on the correlation,
An apparatus for manufacturing wheel rims for automobiles, including: The vehicle wheel rim manufacturing apparatus according to claim 1,
The first drive mechanism includes a first rotation drive servomotor configured to be able to detect a rotation angle of a first motor shaft that rotates integrally with the first roll mold.
The second drive mechanism includes a second rotation drive servomotor configured to detect a rotation angle of a second motor shaft that rotates integrally with the second roll mold,
The control device detects the rotation angle of the first motor shaft detected by the first rotation drive servomotor and the second rotation drive servomotor during feedback control of the interval adjustment servomotor. An automobile wheel rim manufacturing apparatus that derives the total rotation angle using at least one of the rotation angles of the second motor shaft. A method for manufacturing a wheel rim for an automobile, comprising a step of roll-forming using both a first roll mold in which an annular rim work is disposed on the outer peripheral side of the rim work and a second roll mold disposed on the inner peripheral side of the rim work,
The first roll mold and the second roll in a state where the rim work is sandwiched between the first roll mold and the second roll mold while rotating each of the first roll mold and the second roll mold during the roll forming. At least one of the dies is driven in the direction of adjusting the interval between the two roll dies by a servo motor for adjusting the interval, and at least one of the first roll dies and the second roll dies is initially rolled. Based on a predetermined correlation with respect to the total rotation angle from and a parameter relating to the interval between the first roll type and the second roll type, so that the parameter becomes a target value corresponding to the total rotation angle. A method for manufacturing a wheel rim for an automobile, wherein the distance adjusting servomotor is feedback-controlled.