JP2017221958A - Automobile wheel rim manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automobile wheel rim manufacturing device which is hard to generate buckling on first rim work after restarting, when roll molding is restarted after the device has been stopped for a relatively long period.SOLUTION: A manufacturing device is equipped with: a motor shaft 22 to which a bottom roll B is attached; a motor which rotation-drives the motor shaft 22; a motor shaft 42 to which a top roll T is attached; a motor which rotation-drives the motor shaft 42; a servo mechanism type motor 31 which adjusts an interval between the motor shaft 22 and the motor shaft 42; a rotary shaft 53 to which a guide roll G is attached; and a pressing mechanism. The pressing mechanism is equipped with: a base body 51; a moving body 52 which is supported so as to relatively move with regard to the base body 51 and supports the rotary shaft 53; and cylinder mechanisms 51a and 52 which adjust a position of the moving body 52 with regard to the base body 51 and can move a guide roll G between a retracting position and a pressing position. Furthermore, a motor 71 is equipped, which rotation-drives the rotary shaft 53.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an automobile wheel rim manufacturing apparatus.

  2. Description of the Related Art Conventionally, an automobile wheel rim manufacturing apparatus for forming a roll by using both a top roll in which an annular rim work is arranged on the outer periphery side of the rim work and a bottom roll arranged on the inner periphery side of the rim work is known ( For example, see Patent Documents 1 and 2).

  The apparatus described in this document rotationally drives a bottom roll mounting shaft for mounting a bottom roll, a bottom roll driving mechanism for rotating the bottom roll mounting shaft, a top roll mounting shaft for mounting a top roll, and a top roll mounting shaft. A top roll drive mechanism; and an adjustment mechanism for adjusting a distance between the bottom roll mounting shaft and the top roll mounting shaft.

  In this type of apparatus, roll forming of the rim work is performed while the rim work is rotated between the rotating top roll and the bottom roll. At that time, it is necessary to continue rotating the rim work stably. For this reason, in the apparatus described in the above document, the guide roll mounting shaft for attaching the guide roll for pressing the rim work set on the bottom roll from the outer peripheral side of the rim work and the guide roll attached to the guide roll mounting shaft are pressed against the rim work. And a pressing mechanism. The guide roll mounting shaft is disposed above the bottom roll mounting shaft. No mechanism for rotating the guide roll mounting shaft is provided.

  The guide roll is rotationally driven by the rotation of the rotating rim work while roll forming is being performed (more precisely, while the guide roll is pressed against the rim work), while roll forming is not being performed (more precisely, the guide roll is being pressed). While the roll is not pressed against the rim work, it is not driven to rotate. Usually, roll forming of a rim work using this type of apparatus is repeatedly executed at a very short cycle of once (one) every few seconds. For this reason, the guide roll having a relatively large moment of inertia continues to rotate with inertia without stopping the rotation even when roll forming is not being executed.

  By the way, when the operation of repeatedly executing the roll forming described above is restarted after the apparatus is stopped for a relatively long period, the first roll forming after the restart (therefore, the first roll forming after the restart) In the rim work, there is a problem that so-called “buckling” easily occurs in the rim worm.

  As a result of various studies to cope with such problems, the present inventor is likely to buckle in the first rim work after restarting at the start stage of the first roll forming after restarting. It has been found that the rotation of the guide roll is stopped (details will be described later).

  The present invention has been made to cope with the above-described problem, and its purpose is to provide a first rim work after resumption when roll forming is resumed after the apparatus has been stopped for a relatively long period of time. An object of the present invention is to provide an automobile wheel rim manufacturing apparatus in which buckling is unlikely to occur.

Japanese Utility Model Publication No. 62-169733 Japanese Utility Model Publication No. 62-263838

  The automobile wheel rim manufacturing apparatus according to the present invention, like the apparatus described in the above-mentioned document, includes a bottom roll mounting shaft, a bottom roll driving mechanism, a top roll mounting shaft, a top roll driving mechanism, and (first). An adjustment mechanism, a guide roll mounting shaft, and a pressing mechanism are provided.

  The automobile wheel rim manufacturing apparatus according to the present invention is characterized in that a guide roll driving mechanism for rotating the guide roll mounting shaft is provided.

  According to this, when roll forming is resumed after stopping the apparatus for a relatively long period of time, the guide roll is rotationally driven using the guide roll drive mechanism before resumption, so that the first time after resumption. It is possible to realize a state in which the guide roll is rotating at the start of roll forming. As a result, buckling hardly occurs in the first rim work after restart (details will be described later).

  In the manufacturing apparatus according to the present invention, the guide roll drive mechanism is a clutch mechanism that selectively realizes a connected state in which a drive torque transmission system from a drive source to the guide roll mounting shaft is connected and a cut-off state in which it is disconnected. Is preferably provided.

  After execution of the first roll forming after resumption, as described above, the guide roll can continue to rotate with inertia without stopping rotation even when roll forming is not being executed. Therefore, it is less necessary to continue to rotate the guide roll using the guide roll drive mechanism.

  According to the above configuration, after the guide roll is rotationally driven by operating the drive source while maintaining the clutch mechanism in the connected state before restarting, after the first roll forming after restarting, the clutch mechanism is By maintaining the shut-off state and stopping the drive source, it is possible to realize a state where the guide roll continues to rotate by inertia. Therefore, the energy consumption of the apparatus can be reduced as compared with the aspect in which the drive source is continuously operated during the execution of the operation of repeatedly executing the roll forming.

  In the manufacturing apparatus according to the present invention, typically, the pressing mechanism is supported so as to be relatively movable with respect to the base, the movable body supporting the guide roll mounting shaft, and the base. A second adjusting mechanism that is movable by adjusting the position of the movable body between the retracting position of the guide roll mounting shaft and the pressing position where the guide roll presses the rim work from the outer periphery side of the rim work; Is provided. In this configuration, it is preferable that the guide roll driving mechanism is provided on the movable body.

  In this case, the first adjustment mechanism adjusts the interval between the bottom roll mounting shaft and the top roll mounting shaft by moving the top roll mounting shaft in the vertical direction with respect to the bottom roll mounting shaft. Preferably, when the top roll mounting shaft moves in the vertical direction, the base body is configured to move in the vertical direction integrally with the top roll mounting shaft.

  According to this, the guide roll mounting shaft (guide roll) and the top roll mounting shaft (top roll) move integrally in the vertical direction. Therefore, the distance between the “retracted position” and the “pressing position” of the guide roll mounting shaft as compared to the configuration in which the guide roll mounting shaft (guide roll) and the top roll mounting shaft (top roll) individually move in the vertical direction. It becomes easy to make small. As a result, the “relative movement range of the moving body with respect to the base body” required in the second adjustment mechanism can be easily reduced, and the second adjustment mechanism can be reduced in size.

FIG. 1 is a front view schematically showing a schematic configuration of an embodiment of an automobile wheel rim manufacturing apparatus according to the present invention. FIG. 2 is a right side view of the embodiment shown in FIG. 3 is a view taken in the direction of the arrow 3-3 shown in FIG. 2, and FIG. 3A is a first view showing a state in which the position of the base 51 in the axial direction is adjusted, and FIG. FIG. 10 is a second view showing how the position of the base 51 in the axial direction is adjusted. FIG. 4 is a first view corresponding to FIG. 1 and showing how the position of the base 62 in the axial direction is adjusted. FIG. 5 is a second view corresponding to FIG. 1 and showing how the position of the base 62 in the axial direction is adjusted. FIG. 6 is a first diagram corresponding to FIG. 2 showing a state in which the vertical position of the base 62 is adjusted. FIG. 7 is a second view corresponding to FIG. 2 showing a state in which the vertical position of the base 62 is adjusted. FIG. 8 is a first diagram corresponding to FIG. 2 showing a procedure for roll-forming the rim work W. FIG. 9 is a second view corresponding to FIG. 2 showing the procedure for roll forming the rim work W. FIG. FIG. 10 is a third diagram corresponding to FIG. 1 and showing a procedure for roll-forming the rim work W. FIG. 11 is a fourth diagram corresponding to FIG. 2 showing the procedure for roll-forming the rim work W. FIG. FIG. 12 is a fifth diagram corresponding to FIG. 1 and showing a procedure for roll-forming the rim work W. FIG. 13 is a sixth view corresponding to FIG. 1 and showing a procedure for roll forming the rim work W. FIG. FIG. 14 is a seventh diagram corresponding to FIG. 2 and showing a procedure for roll-forming the rim work W. FIG. 15 is an eighth diagram corresponding to FIG. 1 and showing a procedure for roll forming the rim work W. FIG. 16 is a ninth diagram corresponding to FIG. 2 showing the procedure for roll-forming the rim work W. FIG. 17 is a tenth view corresponding to FIG. 2 and showing a procedure for roll-forming the rim work W. FIG. 18 is an eleventh view corresponding to FIG. 2 showing a procedure for roll forming the rim work W. FIG. 19 is a twelfth view corresponding to FIG. 1 and showing a procedure for roll forming the rim work W. FIG. FIG. 20 is a thirteenth view corresponding to FIG. 2 and showing a procedure for roll forming the rim work W. FIG. 21 is a fourteenth view corresponding to FIG. 2 and showing a procedure for roll forming the rim work W. FIG. 22 is a view corresponding to FIG. 1 of a modification of the embodiment of the apparatus for manufacturing the wheel rim for an automobile according to the present invention. FIG. 23 is a diagram corresponding to FIG. 2 of the modified example shown in FIG.

  Hereinafter, an embodiment of an automobile wheel rim manufacturing apparatus according to the present invention (hereinafter referred to as “the present apparatus”) will be described with reference to the drawings. In the drawings, the axial direction (horizontal direction) corresponds to the x-axis direction, the horizontal direction orthogonal to the axial direction corresponds to the y-axis direction, and the vertical direction corresponds to the z-axis direction.

(Constitution)
As shown in FIGS. 1 and 2, the present embodiment includes a metal frame 10. The outer frame of the frame 10 is placed on a floor surface (mounting surface, horizontal surface) and extends in the horizontal direction, and a side portion that is provided integrally with the lower frame 11 and extends in the vertical direction. The frame 12 and the upper frame 13 are provided integrally with the side frame 12 and extend in the horizontal direction.

  As shown in FIG. 1, in the vicinity of the middle portion in the vertical direction of the pair of side frames 12 positioned at both ends in the axial direction (x-axis direction), the horizontal direction is cantilevered toward the inside of the frame 10. A pair of intermediate frames 14 are integrally provided. The front end surfaces of the pair of intermediate frames 14 are opposed to each other in the axial direction (x-axis direction) with a “gap” therebetween by a predetermined distance at the central portion of the frame 10 in the axial direction (x-axis direction).

  As shown in FIG. 1, an adjustment mechanism 23 that supports the motor 21 so as to be relatively movable in the axial direction (x-axis direction) is provided on the upper surface of each intermediate frame 14. The motor shaft 22 of each motor 21 extends coaxially in the axial direction toward the center of the frame 10. Each adjusting mechanism 23 uses the driving torque of a motor (not shown) or the like to set the position of the corresponding motor 21 in the axial direction based on a command from the control device (microcomputer) 100 as a “first position” (FIG. 1). And a “second position” (a position indicated by a two-dot chain line in FIG. 1).

  As shown in FIG. 1, the corresponding divided rolls of the two divided rolls B <b> 1 and B <b> 2 constituting the bottom roll B are attached to the motor shaft 22 of each motor 21 so as to rotate integrally. When the pair of motors 21 are both in the “second position”, the two split rolls B1 and B2 are in a “separated state” in which they are separated in the axial direction. On the other hand, when the pair of motors 21 are moved closer to each other in the axial direction and moved to the “first position” using the pair of adjusting mechanisms 23 from the “separated state”, the two divided rolls B1 and B2 are moved. A “joined state” is formed in which the bottom roll B is formed by being integrally joined. The bottom roll B 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. The rim work W is a cylindrical metal member used for forming a wheel rim, and is typically formed by welding or the like between end faces of metal plate pieces rounded into an annular shape.

  The pair of motors 21 controls the rotational speed of the bottom roll B based on a command from the control device (microcomputer) 100. Each motor 21 may be a servo mechanism type electric motor (servo motor) equipped with an encoder for detecting the rotation angle of the motor shaft 22. In this case, the detection result of the encoder is supplied to the control device 100, and the pair of motors 21 are driven and controlled based on a command from the control device 100. Here, the pair of motor shafts 22 corresponds to the “bottom roll mounting shaft” of the present invention, and the pair of motors 21 corresponds to the “bottom roll drive mechanism” of the present invention.

  As shown in FIG. 1, a movable frame 15 is disposed below the upper frame 13. On the upper surface of the movable frame 15, a columnar portion 15a is erected integrally upward. The columnar portion 15a is inserted into a bottomed hole portion 13a that opens downwardly and is provided in a projecting portion on the lower surface of the upper frame 13, so that the movable frame 15 moves in the vertical direction with respect to the upper frame 13 ( It is supported so as to be relatively movable in the z-axis direction) and non-rotatably around the z-axis.

  A servo motor 31 is fixed on the upper surface of the upper frame 13. The motor shaft 32 of the servo motor 31 extends downward and extends through the upper frame 13 to the inside of the bottomed hole portion 13a. The external thread part provided integrally with the motor shaft 32 is screwed with the internal thread part formed inside the columnar part 15a. As a result, when the servo motor 31 rotates the motor shaft 32, the movable frame 15 moves in the vertical direction (z-axis direction).

  The servo motor 31 is a servo mechanism type electric motor equipped with an encoder for detecting the rotation angle of the motor shaft 32. The detection result of the encoder is supplied to the control device 100, and the rotational angle of the servo motor 31 is controlled based on a command from the control device 100, whereby the position of the movable frame 15 in the vertical direction (z-axis direction) is adjusted. It has become so.

  As shown in FIG. 1, a motor 41 is fixed to the lower surface of the movable frame 15. The motor shaft 42 of the motor 41 extends in the axial direction (x-axis direction). The motor shaft 42 is provided substantially parallel (or parallel) to the motor shaft 22. A top roll T is attached to the motor shaft 42 so as to rotate integrally. The top roll T is a cylindrical metal member used for roll forming of the rim work W, and is disposed on the rim work outer peripheral side of the rim work W. The motor 41 controls the rotational speed of the top roll T based on a command from the control device (microcomputer) 100. Similar to the motor 21, the motor 41 may be a servo mechanism type electric motor (servo motor) equipped with an encoder for detecting the rotation angle of the motor shaft 42.

  The top roll T attached to the motor shaft 42 is disposed above the bottom roll B attached to the pair of motor shafts 22. Therefore, by controlling the rotation angle of the servo motor 31, the distance in the vertical direction (z-axis direction) between the motor shaft 42 (top roll T) and the pair of motor shafts 22 (bottom roll B) can be adjusted. It has become. Here, the motor shaft 42 corresponds to the “top roll mounting shaft” of the present invention, the motor 41 corresponds to the “top roll drive mechanism” of the present invention, “the servo motor 31, the male screw portion of the motor shaft 32, and The “internal thread portion of the columnar portion 15a” corresponds to the “first adjusting mechanism” of the present invention.

  As shown in FIG. 2 and FIG. 3, which is a view taken along arrow 3-3 in FIG. 2, each of the pair of inclined portions 15 b formed at both ends in the horizontal direction (y-axis direction) of the movable frame 15. On the lower surface, two parallel guide rails 15c that support the base 51 so as to be relatively movable in the axial direction (x-axis direction) are provided.

  As shown in FIG. 3, a servo motor 54 is fixed to the lower surface of each inclined portion 15b. The motor shaft 55 of each servo motor 54 extends in the axial direction (x-axis direction) and penetrates the base body 51. A male thread portion provided integrally with each motor shaft 55 is screwed with a female thread portion formed inside the base body 51.

  Each servomotor 54 is a servomechanism type electric motor equipped with an encoder for detecting the rotation angle of the corresponding motor shaft 55, similarly to the servomotor 31 described above. Accordingly, the rotation angle of each servo motor 54 is controlled based on a command from the control device 100 based on the detection result of the encoder, and as shown in FIGS. The position in the axial direction (x-axis direction) 51 is adjusted.

  As shown in FIG. 2, a cylinder portion 51 a that opens obliquely downward toward the direction in which the bottom roll B exists is disposed inside each base 51. One end of a rod-like moving body 52 is inserted into each cylinder portion 51a, and the moving body 52 can move relative to the base body 51 in the axial direction of the cylinder portion 51a, and the axis of the cylinder portion 51a. It is supported so that it cannot rotate relative to the surroundings.

  A rotating shaft 53 extending in the axial direction (x-axis direction) is provided at the other end of each moving body 52 so as to be rotatable around the axis. The rotating shaft 53 is provided substantially parallel (or parallel) to the motor shaft 22. A guide roll G is attached to each rotary shaft 53 so as to rotate integrally. The pair of guide rolls G are rotating members for pressing from the outer periphery side of the rim work in order to stabilize the rim work W set on the bottom roll B.

  The rotating shaft 53 (guide roll G) corresponding to each base 51 moves integrally in the axial direction (x-axis direction). Therefore, by controlling the rotation angle of the pair of servo motors 54, as shown in FIGS. 3A and 3B, the axis of the pair of rotating shafts 53 (the pair of guide rolls G). The position in the direction (x-axis direction) can be adjusted.

  Also, a so-called “hydraulic cylinder mechanism” is constituted by the cylinder portion 51 a of each base 51 and the corresponding moving body 52. As will be described later, by adjusting the hydraulic pressure in each cylinder portion 51a based on a command from the control device 100, each rotary shaft 53 (each guide roll G) is in the “retracted position” and the guide roll G is in the rim work. It can move linearly between the “pressing position” where W is pressed from the outer periphery side of the rim work. The “pressing position” is located obliquely below the “retracting position”.

  In addition, the pair of base bodies 51 and the motor shaft 42 disposed on the movable frame 15 move integrally in the vertical direction (z-axis direction). Therefore, by controlling the rotation angle of the servo motor 31, the pair of base bodies 51 (and hence the pair of guide rolls G) and the motor shaft 42 (and hence the top roll T) are integrally formed in the vertical direction (z axis). Direction).

  Here, the pair of rotating shafts 53 corresponds to the “guide roll mounting shaft” of the present invention, the pair of base bodies 51 corresponds to the “base body” of the present invention, and the pair of moving bodies 52 corresponds to “the base body” of the present invention. A pair of “cylinder portion 51a and moving body 52 of base 51” corresponds to “pressing mechanism” of the present invention, and “cylinder portion 51a and moving body 52 of base 51” is a book. This corresponds to the “second adjusting mechanism” of the invention.

  As shown in FIGS. 2 and 3, a motor 71 is fixed to the lower surface of each moving body 52. The motor shaft 72 of each motor 71 extends in the axial direction (x-axis direction). The power of each motor shaft 72 is transmitted to the corresponding rotating shaft 53 via a belt (or chain) 73. That is, each rotary shaft 53 (and hence the guide roll G) is rotated by the corresponding motor 71.

  Each motor 71 includes a clutch mechanism 74. Each clutch mechanism 74 selectively realizes a connected state in which a drive torque transmission system from the motor 71 to the motor shaft 72 (and hence the rotating shaft 53) is connected and a disconnected state in which the system is disconnected.

  The pair of motors 71 and the pair of clutch mechanisms 74 are controlled based on commands from the control device (microcomputer) 100. Similar to the motor 21, the motor 71 may be a servo mechanism type electric motor (servo motor) equipped with an encoder for detecting the rotation angle of the motor shaft 72. Here, a pair of “motor 71, motor shaft 72, and belt 73” corresponds to “guide roll drive mechanism” of the present invention, and a pair of motor 71 corresponds to “drive source” of the present invention, The pair of clutch mechanisms 74 corresponds to the “clutch mechanism” of the present invention.

  As shown in FIGS. 1 and 2, two parallel guide rails 11 a are provided on the upper surface of the lower frame 11 to support the movable table 61 so as to be relatively movable in the axial direction (x-axis direction). As shown in FIG. 1, a servo motor 68 is fixed to the upper surface of the lower frame 11. A motor shaft 69 of the servo motor 68 extends in the axial direction (x-axis direction) and penetrates the movable table 61. A male screw portion provided integrally with the motor shaft 69 is screwed with a female screw portion formed inside the movable base 61.

  The servomotor 68 is a servomechanism type electric motor equipped with an encoder for detecting the rotation angle of the motor shaft 69, similar to the servomotor 31 described above. Therefore, by controlling the rotation angle of the servo motor 68 based on a command from the control device 100 based on the detection result of the encoder, from the “operation position” shown in FIG. 4 to the “original position” shown in FIG. The position of the movable table 61 in the axial direction (x-axis direction) is adjusted.

  As shown in FIGS. 1 and 2, a base body 62 is disposed above the movable table 61. The plurality of columnar portions erected on the upper surface of the movable base 61 are respectively inserted into the corresponding bottomed holes opened downward on the lower surface of the base 62, whereby the base 62 is moved to the movable base 61. It is supported so as to be able to move relative to 61 in the vertical direction (z-axis direction) and not to rotate relative to the z-axis.

  A servo motor 66 is embedded and fixed above the movable table 61. The motor shaft 67 of the servo motor 66 extends upward to the inside of the base body 62. A male thread portion provided integrally with the motor shaft 67 is screwed with a female thread portion formed inside the base body 62.

  The servomotor 66 is a servomechanism type electric motor equipped with an encoder for detecting the rotation angle of the motor shaft 67, as in the servomotor 31 described above. Accordingly, the rotation angle of the servo motor 66 is controlled based on a command from the control device 100 based on the detection result of the encoder, so that the vertical direction (z-axis direction) of the base body 62 as shown in FIGS. The position of is adjusted.

  A cylinder portion 63 that opens obliquely upward in the direction in which the bottom roll B exists is integrally formed on the inclined upper surface of the base body 62. One end of a rod-like moving body 64 is inserted into the cylinder portion 63, and the moving body 64 can move relative to the cylinder portion 63 (and therefore the base body 62) in the axial direction of the cylinder portion 63, and The cylinder portion 63 is supported so as not to rotate relative to the axis of the cylinder portion 63. A mounting portion 65 for mounting the rim work W is integrally provided at the other end of the moving body 64.

  The base body 62 and the mounting portion 65 move together in the axial direction (x-axis direction). Therefore, by controlling the rotation angle of the servo motor 68, the position of the mounting portion 65 in the axial direction (x-axis direction) is adjusted from the “operation position” shown in FIG. 4 to the “original position” shown in FIG. It has come to be. 4, in the axial direction (x-axis direction), the base body 62 (mounting portion 65) is within the above-described “gap” existing range between the front end surfaces of the pair of intermediate frames 14. Is located. In the “original position” shown in FIG. 5, in the axial direction (x-axis direction), the base body 62 (mounting portion 65) is located outside the existing range of the pair of motor shafts 22 in the “coupled state”. Yes. Further, in the “original position” shown in FIG. 5, the base body 62 (mounting portion 65) is positioned outside the range where the motor shaft 42 exists in the axial direction (x-axis direction).

  In addition, the base body 62 and the mounting portion 65 are integrally moved in the vertical direction (z-axis direction). Therefore, by controlling the rotation angle of the servo motor 66, the vertical position (z-axis direction) of the mounting portion 65 is adjusted as shown in FIGS.

  The cylinder portion 63 and the moving body 64 constitute a so-called “air cylinder mechanism”. By adjusting the air pressure in the cylinder portion 63 based on a command from the control device 100, the placement portion 65 is set to “retreat position” and “for the rim work W to be set on the bottom roll B” as described later. It is possible to move linearly between the “setting position” and the “setting position”. The “set position” is located obliquely above the “retracted position”.

(Roll molding)
Next, a procedure for roll-forming the rim work W using this apparatus will be briefly described with reference to FIGS. This apparatus is an apparatus for manufacturing a desired wheel rim for an automobile by performing roll forming on a rim work W that has been subjected to known flare processing in advance. The roll forming of the rim work W using this apparatus is repeatedly executed at an extremely short period of once (one) per several seconds.

  First, when performing roll forming on the rim work W, the rotation angle of the servo motor 66 is controlled, and the rim work W placed on the placement portion 65 in the “set position” (see FIGS. 11 and 12 described later). The vertical direction (z-axis direction) of the base body 62 (accordingly, the mounting portion 65) so that the vertical position of the central axis of the base member 62 is the optimum position with respect to the pair of motor shafts 22 (bottom roll B). Adjust the position in advance. By controlling the rotation angle of the servo motor 68, the position in the axial direction (x-axis direction) of the base body 62 (accordingly, the mounting portion 65) is adjusted in advance to the “operation position” (see FIG. 10 described later). deep.

  At the start stage of each roll forming, the mounting portion 65 is maintained at the “retracted position” (see FIG. 8 described later) by the control of the “air cylinder mechanism”. In addition, the pair of guide rolls G is maintained at the “retracted position” (see FIG. 8 described later) by the control of the pair of “hydraulic cylinder mechanisms”.

  In addition, the position of the pair of motors 21 in the axial direction (x-axis direction) is maintained at the “second position” (see FIG. 10 described later) by using the pair of adjustment mechanisms 23. Further, by controlling the pair of motors 21 and 41, the rotational speeds of the two split rolls B1 and B2 are matched, and the peripheral speed of the two split rolls B1 and B2 is the peripheral speed of the top roll T. The rotational speeds of the pair of motor shafts 22 and motor shafts 42 are such that the rotational directions of the two split rolls B1 and B2 and the rotational direction of the top roll T are reversed so as to coincide with the speed. It is controlled constantly.

  Further, during the repeated roll forming, the pair of motors 71 are maintained in a stopped state, and the pair of clutch mechanisms 74 are maintained in a disconnected state. Here, the pair of guide rolls G are rotationally driven by the rotation of the rotating rim work W during roll forming (more precisely, while the guide roll G is pressed against the rim work W), During molding non-execution (more precisely, while the guide roll G is not pressed against the rim work W), it is not rotationally driven.

  However, due to the extremely short period of non-execution of roll forming and the relatively large moment of inertia of the guide roll G, the pair of guide rolls G stops rotating even when roll forming is not being executed. Continues to rotate without inertia. Hereinafter, a procedure for performing one roll forming during repeated execution of roll forming will be described.

  After the end of the previous roll forming, first, as shown in FIG. 8, the rim work W is thrown into the throwing shooter 16 fixed to the side frame 12. As a result, the rim work W rolls on the loading shooter 16 toward the placement portion 65 in the “retracted position”, and the rim work W is placed on the placement portion 65 as shown in FIGS. 9 and 10.

  Next, as shown in FIGS. 11 and 12, the “air cylinder mechanism” is controlled to move the mounting portion 65 from the “retracted position” to the “set position”. Thereby, the rim work W is arrange | positioned in the space between the two division | segmentation rolls B1 and B2 which are rotationally driven apart.

  Subsequently, as shown in FIG. 13, the position of the pair of motors 21 in the axial direction (x-axis direction) is moved to the “first position” using the pair of adjusting mechanisms 23. Accordingly, the two divided rolls B1 and B2 are integrally coupled to form the bottom roll B, and the bottom roll B is disposed on the rim work inner peripheral side of the rim work W. Next, as shown in FIGS. 14 and 15, the “air cylinder mechanism” is controlled to return the placement unit 65 from the “set position” to the “retracted position”.

  Thus, when the mounting portion 65 returns from the “set position” to the “retracted position”, the rim work W comes into contact with the bottom roll B that is rotationally driven. However, since the outer diameter of the bottom roll B is smaller than the inner diameter of the rim work W, the contact mode between the two is very close to the line contact, the sliding resistance between them is relatively small, and the inertia moment of the rim work W is Due to the relatively large size, the rim work W does not start to rotate (or only slightly rotates).

  Next, as shown in FIG. 16, the rotation angle of the servo motor 31 is controlled, and the rotationally driven top roll T is lowered to approach the bottom roll B. At this time, as described above, the pair of guide rolls G rotating by inertia are also lowered integrally. At this stage, the top roll T and the pair of guide rolls G are not in contact with the rim work W.

  Next, as shown in FIG. 17, the pair of “hydraulic cylinder mechanisms” are controlled to move the pair of guide rolls G from the “retracted position” to the “pressing position”. As a result, the pair of guide rolls G rotating by inertia contact the rim work W and press the rim work W from the outer periphery side of the rim work. This pressing force has a magnitude corresponding to the hydraulic pressure in the “hydraulic cylinder mechanism”.

  Thus, when the pair of guide rolls G rotating with inertia press the rim work W, the rim work W starts to rotate so as to follow the rotation of the bottom roll B. At this stage, the top roll T is not in contact with the rim work W.

  Next, as shown in FIGS. 18 and 19, the rotation angle of the servo motor 31 is controlled so that the top roll T that is rotationally driven is further lowered and brought into contact with the rotating rim work W. At this time, the pair of guide rolls G continues to press the rim work W. As a result, a state in which the rim work W rotates while the rim work W is sandwiched between the rotationally driven top roll T and bottom roll B is obtained. Since the pair of guide rolls G press the rim work W, the rim work W can continue to rotate stably.

  In this state, the rotation angle of the servo motor 31 is controlled so that the distance between the top roll T and the bottom roll B is gradually reduced (therefore, the pressing force for sandwiching the rim work W is gradually increased). Thereby, the rim work W is rolled (roll-formed) so that the outer peripheral surface thereof follows the shape of the outer peripheral surface of the top roll T and the inner peripheral surface thereof follows the shape of the outer peripheral surface of the bottom roll B. As a result, a wheel rim arranged in a desired shape is obtained.

  After the wheel rim is obtained in this manner, as shown in FIG. 20, the rotation angle of the servo motor 31 is controlled to raise the top roll T and separate it from the bottom roll B. By controlling the “hydraulic cylinder mechanism”, the pair of guide rolls G are returned to the “retracted position” and the pair of guide rolls G are separated from the bottom roll B.

  Then, using the pair of adjustment mechanisms 23, the positions of the pair of motors 21 in the axial direction (x-axis direction) are both returned from the “first position” to the “second position”. Thereby, two division | segmentation roll B1, B2 spaces apart. As a result, as shown in FIG. 21, the rim work W falls, rolls on the discharge shooter 17 fixed to the side frame 12, and is discharged to the outside of the frame 10.

  As described above, by repeatedly executing the above-described series of steps (one roll forming) described with reference to FIGS. 8 to 21, the roll forming of the rim work W using the present apparatus is repeatedly executed in a short cycle. .

(Rotation drive of the guide roll G when the roll forming is resumed after the device is stopped)
When the operation of repeatedly performing the above-described roll forming is temporarily stopped and the apparatus is stopped for a relatively long period of time, then when the operation of repeatedly executing the above-described roll forming is restarted, the first time after the restart In roll forming (therefore, the first rim work W after resumption), there is a problem that the so-called “buckling” is likely to occur in the rim worm W.

  As a result of various studies to cope with such problems, the present inventor is likely to buckle the first rim work W after resumption. The first roll forming start stage after resumption And found that the rotation of the guide roll G is stopped.

  That is, when the first roll forming after the restart is performed while the pair of motors 71 are maintained in the stopped state and the pair of clutch mechanisms 74 are maintained in the disconnected state, the first roll forming start stage Then, the rotation of the guide roll G is stopped. In this state, as shown in FIG. 17 described above, even if the pair of non-rotating guide rolls G are pressed against the rim work W, the rim work W does not start rotating. Accordingly, the pair of guide rolls G does not start rotating.

  In this state, as shown in FIGS. 18 and 19, when the top roll T that is driven to rotate is pressed against the rim work W, the rim work W starts to rotate so as to follow the rotation of the top roll T. When the rim work W starts to rotate, the pair of guide rolls G starts to rotate following the rotation of the rim work W.

  Here, when the rim work W starts to rotate by pressing the top roll T, the pair of guide rolls G that press the rim work W in a non-rotating state acts so as to inhibit the start of the rotation of the rim work W. To do. For this reason, the top roll T that is rotationally driven is pressed against the rim work W in a state where the rotation of the rim work W is difficult to start smoothly. As a result, the rim work W tends to buckle immediately after the top roll T is pressed against the rim work W.

  In order to prevent the occurrence of such buckling, it is only necessary to realize a state in which the pair of guide rolls G are rotating at the start of the first roll forming after the restart. In the present apparatus, as described above, a pair of motors 71 are provided to rotationally drive the pair of guide rolls G. Therefore, the above-described buckling can be prevented by controlling the pair of clutch mechanisms 74 to the connected state and operating the pair of motors 71 to rotationally drive the pair of guide rolls G before restarting. .

  Here, the circumferential speed of the pair of guide rolls G matches the circumferential speed of the top roll T, and the rotational direction of the pair of guide rolls G and the rotational direction of the top roll T match. It is preferable to control the pair of motors 71.

  After execution of the first roll forming after resumption, as described above, the pair of guide rolls G can continue to rotate with inertia without stopping rotation even when roll forming is not being executed. Therefore, it is less necessary to continue to rotationally drive the pair of guide rolls G using the pair of motors 71. Therefore, it is preferable to stop the pair of motors 71 by maintaining the pair of clutch mechanisms 74 in the disconnected state after the first roll forming after the restart. Thereby, in addition to realizing a state in which the pair of guide rolls G continues to rotate by inertia, the present apparatus is compared with the mode in which the pair of motors 71 are continuously operated during the operation of repeatedly performing the roll forming. Energy consumption can be reduced.

(Action / Effect)
As described above, according to the present embodiment, when roll forming is resumed after the apparatus is stopped for a relatively long period of time, a pair of guide rolls G is used by using the “guide roll drive mechanism” before the resume. By rotationally driving, it is possible to realize a state in which the pair of guide rolls G is rotating at the start of the first roll forming after the restart. As a result, buckling hardly occurs in the first rim work W after resumption.

  Further, according to the present embodiment, the pair of rotating shafts 53 (the pair of guide rolls G) and the motor shaft 42 (the top roll T) move integrally in the vertical direction. Therefore, compared to the configuration in which the guide roll G and the top roll T individually move in the vertical direction, the distance between the “retraction position” and the “pressing position” of the pair of guide rolls G can be easily reduced. As a result, the “relative movement range of the moving body 52 with respect to the base 51” required in the pair of “hydraulic cylinder mechanisms” can be easily reduced, and the pair of “hydraulic cylinder mechanisms” can be reduced in size.

  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, the following embodiments applying the above embodiment can be implemented.

  In the above embodiment, as the servo motor 31, the pair of servo motors 54, the servo motor 66, and the servo motor 68, a servo mechanism type electric motor equipped with an encoder that detects the rotation angle of the corresponding motor shaft is used. However, an electric motor other than the servo mechanism type electric motor may be used as these motors.

  Moreover, in the said embodiment, although the space | interval of the bottom roll B and the top roll T is adjusted by moving only the top roll T to an up-down direction (z-axis direction), only the bottom roll B or a bottom roll The distance between the bottom roll B and the top roll T may be adjusted by moving both B and the top roll T in the vertical direction (z-axis direction).

  In the above embodiment, by controlling the rotation angle of the servo motors 66 and 68, the position of the base body 62 (mounting portion 65) in the vertical direction (z-axis direction) and the axial direction (x-axis direction) can be adjusted. However, the position in the vertical direction (z-axis direction) and the axial direction (x-axis direction) of the base body 62 (mounting portion 65) may not be adjustable. Furthermore, in the said embodiment, although the mounting part 65 (and various members related to these) is provided, the mounting part 65 (and various members related to these) may be abbreviate | omitted. .

  Further, in the above embodiment, by controlling the rotation angle of the pair of servo motors 54, the position in the axial direction (x-axis direction) of the pair of rotation shafts 53 (the pair of guide rolls G) can be adjusted. However, the position in the axial direction (x-axis direction) of the pair of rotation shafts 53 (the pair of guide rolls G) may not be adjustable.

  In the above-described embodiment, the pair of rotating shafts 53 (the pair of guide rolls G) and the motor shaft 42 (the top roll T) are configured to move integrally in the vertical direction. The shaft 53 (a pair of guide rolls G) and the motor shaft 42 (top roll T) may be configured to move individually in the vertical direction.

  Moreover, in the said embodiment, although the bottom roll formed by integrally couple | bonding two division | segmentation rolls B1 and B2 is used as the bottom roll B, as shown in FIG.22 and FIG.23, bottom roll B is used. As an example, one non-divided bottom roll B may be used. In the example shown in FIGS. 22 and 23, one motor 21 and one adjustment mechanism 23 of the pair of motors 21 and the pair of adjustment mechanisms 23 are omitted. 22 and 23, the same or equivalent members as those shown in FIGS. 1 and 2 are denoted by the same reference numerals as those shown in FIGS.

  As shown in FIGS. 22 and 23, when the bottom roll B is a non-split type, it is easier to design the outer diameter of the bottom roll B smaller than when the bottom roll B is a split type as in the above embodiment. When the outer diameter of the bottom roll B becomes smaller, the outer diameter of the bottom roll B becomes smaller than the inner diameter of the rim work W, so that the contact mode between the two becomes closer to the line contact. As a result, the sliding resistance between the two becomes further smaller, and the rim work W becomes more difficult to start rotating. In other words, buckling is more likely to occur in the rim work W. Therefore, when the above-described “guide roll driving mechanism” is applied to an apparatus in which the bottom roll B as shown in FIGS. 22 and 23 is a non-divided type, it can be said that it is more effective in terms of preventing buckling. .

  DESCRIPTION OF SYMBOLS 21 ... Motor, 22 ... Motor shaft, 31 ... Servo motor, 32 ... Motor shaft, 41 ... Motor, 42 ... Motor shaft, 51 ... Substrate, 52 ... Moving body, 53 ... Rotating shaft, 71 ... Motor, 72 ... Motor shaft 73 ... Belt, 74 ... Clutch mechanism, B ... Bottom roll, T ... Top roll, G ... Guide roll

Claims (4)

An apparatus for manufacturing a wheel rim for an automobile for roll forming using both a top roll arranged on the outer circumference side of an annular rim work and a bottom roll arranged on the inner circumference side of the rim work,
A bottom roll mounting shaft for mounting the bottom roll;
A bottom roll drive mechanism that rotationally drives the bottom roll mounting shaft;
A top roll mounting shaft which is disposed above the bottom roll mounting shaft and which mounts the top roll;
A top roll drive mechanism for rotationally driving the top roll mounting shaft;
A first adjustment mechanism for adjusting a distance between the bottom roll mounting shaft and the top roll mounting shaft;
A guide roll mounting shaft that is disposed above the bottom roll mounting shaft and that mounts a guide roll for pressing the rim work set on the bottom roll from the outer peripheral side of the rim work;
A pressing mechanism for pressing the guide roll mounted on the guide roll mounting shaft against the rim work;
A guide roll drive mechanism for rotating the guide roll mounting shaft;
A wheel rim manufacturing apparatus comprising: The vehicle wheel rim manufacturing apparatus according to claim 1,
The guide roll drive mechanism includes a clutch mechanism that selectively realizes a connection state for connecting a drive torque transmission system from a drive source to the guide roll mounting shaft and a cut-off state for disconnection. manufacturing device. An apparatus for manufacturing a wheel rim for an automobile according to claim 1 or 2,
The pressing mechanism is
A substrate;
A movable body that is supported so as to be relatively movable with respect to the base body and supports the guide roll mounting shaft;
By adjusting the position of the movable body with respect to the base body, a second adjustment is possible in which the guide roll mounting shaft is movable between a retracted position and a pressing position where the guide roll presses the rim work from the outer periphery side of the rim work. Mechanism,
With
An apparatus for manufacturing a wheel rim for an automobile, wherein the guide roll driving mechanism is provided on the movable body. In the manufacturing apparatus of the wheel rim for vehicles according to claim 3,
The first adjusting mechanism is configured to adjust a distance between the bottom roll mounting shaft and the top roll mounting shaft by moving the top roll mounting shaft in a vertical direction with respect to the bottom roll mounting shaft. ,
An apparatus for manufacturing a wheel rim for an automobile, wherein the base body moves in the vertical direction integrally with the top roll mounting shaft when the top roll mounting shaft moves in the vertical direction.

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