Press Equipment

Abstract

To perform position adjustment for a movable part of a die with high accuracy.SOLUTION: A press device comprises: a die; a punch that can move in a press direction with respect to the die; a movable part, provided in at least either of the die and the punch, which can move in the press direction with respect to the at least either of the die and the punch; a motor that is rotationally-driven on the basis of a command value indicating a rotation amount; a rotary shaft, connected to the motor, which rotates accompanying rotation of the motor; and a converting mechanism that converts rotation of the rotary shaft to linear movement in the press direction of the movable part with respect to the at least either of the die and the punch.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a press apparatus. [Background technology]

[0002] In press molding, there is a technique for improving the dimensional accuracy of a press-molded product by making a part of a die movable. For example, Japanese Patent No. 6179696 (Patent Document 1) discloses a press device including a die having a die pad and a punch having an inner pad arranged opposite to the die. The inner pad is connected to the punch by a pad press device. The pad press device includes, for example, a gas cushion, a hydraulic device, an electric drive device, and the like. A manufacturing method of a press-molded product using this press device includes a first step of sandwiching an intermediate material between the inner pad and the die pad while the inner pad is protruding from the punch and the die pad is protruding from the die, a second step of moving the die relative to the die pad, the inner pad, and the punch, and a third step of moving the die and the die pad relative to the inner pad and the punch after the die and the die pad are integrated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6179696 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional press apparatus, it is not assumed that the amount of protrusion of the inner pad from the punch will be precisely controlled. In a configuration in which the inner pad and the punch are connected by a pad pressure device such as a gas cushion, as in the conventional press apparatus, it is difficult to precisely control the amount of protrusion of the inner pad from the punch.

[0005] The inventors have investigated how to control the shape of a press-formed product with high precision by adjusting the position of a movable part, such as an inner pad, provided on a die or a punch with high precision.

[0006] An object of the present disclosure is to provide a press device that can adjust the position of a movable part of a die with high precision. [Means for solving the problem]

[0007] A press apparatus in an embodiment of the present invention includes a die, a punch movable relative to the die in a press direction, a movable part provided on at least one of the die and the punch and movable in the press direction relative to at least one of the die and the punch, a motor whose rotation is controlled by a command value for achieving a target rotation state, a rotating shaft connected to the motor and rotating in conjunction with the rotation of the motor, and a conversion mechanism that converts the rotation of the rotating shaft into linear movement of the movable part in the press direction relative to at least one of the die and the punch. Effect of the Invention

[0008] According to the present disclosure, the position of the movable part of the mold can be adjusted with high precision. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a press device according to the present embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the press apparatus shown in FIG. 1 taken along line II-II. [Figure 3A] FIG. 3A is a diagram showing an example of press molding using the press apparatus shown in FIG. [Figure 3B] FIG. 3B is a diagram showing an example of press molding using the press apparatus shown in FIG. [Figure 3C] FIG. 3C is a diagram showing an example of press molding using the press apparatus shown in FIG. [Figure 3D] FIG. 3D is a diagram showing an example of press molding using the press apparatus shown in FIG. [Figure 4] FIG. 4 is a side view showing a press device 1 in a modified example of the present embodiment. [Diagram 5] FIG. 5 is a side view showing a press device 1 in another modified example of this embodiment. [Figure 6] FIG. 6 is a side view showing a press device 1 in still another modified example of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Configuration 1) A press apparatus in an embodiment of the present invention includes a die, a punch movable relative to the die in a press direction, a movable part provided on at least one of the die and the punch and movable in the press direction relative to at least one of the die and the punch, a motor whose rotation is controlled by a command value for achieving a target rotation state, a rotating shaft connected to the motor and rotating in conjunction with the rotation of the motor, and a conversion mechanism that converts the rotation of the rotating shaft into linear movement of the movable part in the press direction relative to at least one of the die and the punch.

[0011] According to the above configuration 1, the motor can be controlled to rotate to a target state by a command value. The conversion mechanism converts the rotation of the rotating shaft that rotates with the rotation of the motor into a linear movement of the movable part along the press direction. In other words, when the rotating shaft rotates, the movable part moves linearly along the press direction relative to at least one of the die and the punch. Therefore, the rotation state of the motor is reflected in the linear movement of the movable part in the press direction relative to at least one of the die and the punch by the rotating shaft and the conversion mechanism. As a result, the movement amount of the movable part can be precisely controlled by precisely controlling the rotation state of the motor by a command value. Therefore, the position adjustment of the movable part can be performed with high precision. For example, the movable part can be precisely moved so that the relative position of the movable part with respect to at least one of the die and the punch becomes a target position.

[0012] (Configuration 2) The rotation shaft of the motor may be perpendicular to the pressing direction. In this case, for example, the motor may be disposed in such a position that the output shaft of the motor is aligned in a direction perpendicular to the pressing direction.

[0013] (Configuration 3) In the above configuration 2, the rotating shaft may have a male screw groove. The conversion mechanism may include a table having a support surface perpendicular to the pressing direction, and a pair of wedge-shaped jigs arranged side by side in the extending direction of the rotating shaft between the table and the movable part. Each of the pair of wedge-shaped jigs has a bottom surface that slidably contacts the support surface of the table, and an inclined surface that is inclined with respect to the pressing direction and slidably contacts the bottom surface of the movable part. The inclined surfaces of each of the pair of wedge-shaped jigs are inclined so that the one closer to the opposing wedge-shaped jig is lower. The bottom surface of the movable part includes an inclined surface having an inclination angle equal to that of each of the inclined surfaces of the pair of wedge-shaped jigs. The pair of wedge-shaped jigs has a female screw groove that meshes with the male screw groove of the rotating shaft. The female screw grooves of the pair of wedge-shaped jigs are formed so that they move toward each other or away from each other as the rotating shaft rotates.

[0014] According to the above configuration 3, the pair of wedge-shaped jigs move toward each other or away from each other in the direction of the rotation axis by the rotation of the rotating shaft connected to the motor. When the pair of wedge-shaped jigs move toward each other, the movable part moves away from the table in the press direction. When the pair of wedge-shaped jigs move away from each other, the movable part moves toward the table in the press direction. In this way, the rotation of the rotating shaft is converted into a movement in the rotation axis direction of the wedge-shaped jig, which is further converted into a movement of the movable part in the press direction. With this configuration, the movement amount of the movable part relative to the rotation amount of the rotating shaft can be reduced. Therefore, the position adjustment of the movable part can be performed with higher accuracy. Also, with this configuration, the load of the movable part in the press direction is received by the wedge-shaped jig and the table. The rotating shaft does not directly receive the load in the press direction from the movable part. The load in the direction bending the rotating shaft is reduced.

[0015] (Configuration 4) The motor may include a first motor and a second motor. The rotating shaft may include a first rotating shaft connected to the first motor and a second rotating shaft coaxial with the first rotating shaft and connected to the second motor. The first rotating shaft and the second rotating shaft may have male screw grooves. The conversion mechanism may include a base having a support surface perpendicular to the pressing direction, and a pair of wedge-shaped shafts arranged side by side in the extending direction of the rotating shaft between the base and the movable part. Each of the pair of wedge-shaped shafts has a bottom surface that slidably contacts the support surface of the base, and an inclined surface that is inclined with respect to the pressing direction and slidably contacts the bottom surface of the movable part. The inclined surface of each of the pair of wedge-shaped jigs is inclined so that the one closer to the opposing wedge-shaped jig is lower. The bottom surface of the movable part includes an inclined surface having an inclination angle equal to that of each of the inclined surfaces of the pair of wedge-shaped jigs. One of the pair of wedge-shaped jigs has an internal thread groove that meshes with the external thread groove of the first rotating shaft, and the other of the pair of wedge-shaped jigs has an internal thread groove that meshes with the external thread groove of the second rotating shaft.

[0016] According to the above configuration 4, when the first rotating shaft is rotated by the rotation of the first motor, one wedge-shaped jig moves in the direction of the rotation shaft. When the second rotating shaft is rotated by the rotation of the second motor, the other wedge-shaped jig moves in the direction of the rotation shaft. That is, the first motor controls the position of one wedge-shaped jig in the direction of the rotation shaft, and the second motor controls the position of the other wedge-shaped jig in the direction of the rotation shaft. By controlling the distance between the pair of wedge-shaped jigs, the position of the movable part in the pressing direction can be controlled. In addition, the posture of the movable part can be controlled by the positions of the one wedge-shaped jig and the other wedge-shaped jig. Therefore, the position and posture of the movable part can be adjusted with higher precision.

[0017] (Configuration 5) In any of configurations 1 to 4, a biasing member may be further provided that biases the movable part in a direction to return the movable part against a force that presses the movable part into the die or the punch. This allows press molding using a die and a punch to be performed both in a state in which the movable part protrudes from at least one of the die or the punch, and in a state in which the movable part is pressed into at least one of the die or the punch.

[0018] (Configuration 6) In any of the configurations 1 to 4, the motor, the rotating shaft, and the conversion mechanism may be fixed to at least one of the die and the punch on which the movable part is provided. This makes it possible to change the shape of the die or punch to a different shape by changing the position of the movable part. Therefore, it is possible to change to a die or punch with a different shape without replacing the die or punch, and it is possible to obtain a press device that is advantageous in terms of cost.

[0019] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated. In order to make the description easier to understand, the drawings referred to below show the configuration in a simplified or schematic manner, and some of the components are omitted.

[0020] [Embodiment] FIG. 1 is a side view showing a configuration example of a press device in this embodiment. FIG. 2 is a cross-sectional view of the press device shown in FIG. 1 along line II-II. The press device 1 presses a plate material B to produce a press-molded product. The press device 1 has a die 2, a punch 6, and movable parts 4 and 5 as dies. The die 2 is movable in a press direction PD relative to the punch 6. That is, the die 2 and the punch 6 are movable relative to each other. The direction of this relative movement is the press direction. The press device 1 presses the plate material B by disposing the plate material B between the die 2 and the punch 6 and pressing the plate material from both the die 2 and the punch 6. The movable part 4 is provided on the die 2 and is movable in the press direction relative to the die 2. The movable part 5 is provided on the punch 6 and is movable in the press direction relative to the punch 6.

[0021] The press apparatus 1 includes a first motor 9a and a second motor 9b, and a first rotating shaft 8a and a second rotating shaft 8b. (Hereinafter, unless otherwise specified, the first motor 9a and the second motor 9b may be collectively referred to as motors 9, and the first rotating shaft 8a and the second rotating shaft 8b may be collectively referred to as rotating shaft 8.) The first rotating shaft 8a is connected to the first motor 9a and rotates around its axis as the first motor 9a rotates. The second rotating shaft 8b is connected to the second motor 9b and rotates around its axis as the second motor 9b rotates. The first rotating shaft 8a and the second rotating shaft 8b are perpendicular to the press direction PD. The first rotating shaft 8a and the second rotating shaft 8b are coaxial.

[0022] The press apparatus 1 includes a conversion mechanism that converts the rotation of the rotation shafts 8a, 8b into linear movement of the movable part 5 in the press direction relative to the punch 6. In the example shown in Fig. 1, the conversion mechanism includes a base 72 having a support surface 72s perpendicular to the press direction, and a pair of wedge-shaped jigs 71a, 71b. The pair of wedge-shaped jigs 71a, 71b are arranged side by side in the extension direction of the rotation shafts 8a, 8b between the support surface 72s of the base 72 and the movable part 5.

[0023] Each of the pair of wedge-shaped jigs 71a and 71b has a bottom surface 71ad, 71bd and an inclined surface 71au, 71bu on the opposite side. The bottom surface 71ad, 71bd is in slidable contact with the support surface 72s of the base 72. The inclined surfaces 71au, 71bu are inclined with respect to the pressing direction and are in slidable contact with the bottom surfaces 5ad, 5bd of the movable part 5. The inclined surfaces 71au, 71bu of the pair of wedge-shaped jigs 71a and 71b are inclined so that the surface closer to the opposing wedge-shaped jig facing the pair of wedge-shaped jigs 71a and 71b is lower in the direction of the rotation axes 8a and 8b. In other words, the inclined surfaces 71au, 72bu are inclined so that the surface becomes higher as it moves away from the opposing wedge-shaped jig in the direction of the rotation axes.

[0024] The bottom surface of the movable part 5 includes inclined surfaces 5ad and 5bd having the same inclination angle as the inclined surfaces 71au and 71bu of the pair of wedge-shaped jigs 71a and 71b. The inclination angle of one inclined surface 5ad of the movable part 5 is the same as the inclination angle of the inclined surface 71au of one wedge-shaped jig 71a. The inclination angle of the other inclined surface 5bd of the movable part 5 is the same as the inclination angle of the inclined surface 71bu of the other wedge-shaped jig 71b. The inclined surface 5ad and the inclined surface 71au are in contact with each other so as to be able to slide. The inclined surface 5bd and the inclined surface 71bu are in contact with each other so as to be able to slide. Here, the same angle includes a case where the angle is strictly the same, as well as a case where the angle is slightly different within the range in which the movable part and the wedge-shaped jig can slide. In the example shown in FIG. 1, the inclined surface 5ad and the inclined surface 5bd of the bottom surface of the movable part 5 are connected. The boundary between the inclined surface 5ad and the inclined surface 5bd forms a ridgeline.

[0025] The first rotating shaft 8a has a male thread groove on its outer periphery. One wedge-shaped jig 71a has a female thread groove that meshes with the male thread groove of the first rotating shaft 8a. Specifically, a female thread groove is formed on the inner periphery of the hole of the wedge-shaped jig 71a. The first rotating shaft 8a is inserted into the hole of the wedge-shaped jig 71a. The second rotating shaft 8b has a male thread groove on its outer periphery. The other wedge-shaped jig 71b has a female thread groove that meshes with the male thread groove of the second rotating shaft 8b. Specifically, a female thread groove is formed on the inner periphery of the hole of the wedge-shaped jig 71b.

[0026] When the rotating shaft 8a rotates with the rotation of the first motor 9a, one wedge-shaped jig 71a moves in the axial direction of the rotating shaft 8a. When the rotating shaft 8b rotates with the rotation of the second motor 9b, the other wedge-shaped jig 71b moves in the axial direction of the rotating shaft 8b. When the wedge-shaped jig 71a and the wedge-shaped jig 71b move toward each other, the movable part 5 rises in the pressing direction. When the wedge-shaped jig 71a and the wedge-shaped jig 71b move away from each other, the movable part 5 descends in the pressing direction. The position of the movable part 5 relative to the punch 6 can be adjusted by controlling the rotation of the first motor 9a and the second motor 9b.

[0027] The rotation of the motor 9 is controlled by a command value for achieving a target rotation state. The rotation state of the motor controlled by the command value is, for example, the amount of rotation, the rotation position, the rotation speed, or the torque. The command value is a value including information on the target rotation state. As an example, the command value is a value for controlling the motor to achieve the target amount of rotation or the target rotation position. For example, the command value may be a value indicating the rotation position, rotation angle, rotation speed, current value, voltage value, or other physical quantity that can be converted into the rotation state of the motor.

[0028] The motor 9 may, for example, include a rotor and a stator, as well as a driver that supplies power to rotate the rotor, and a detector that detects the rotation state of the motor. The rotation state detected by the detector is fed back to the driver. The driver controls the power supplied so that the rotation state of the motor approaches a target indicated by a command value. The motor 9 may, for example, be a motor (e.g., a servo motor or a stepping motor) that can be controlled to reach a target rotation position or amount of rotation by a command value.

[0029] The command value may be determined, for example, by the control unit 12. For example, the control unit 12 generates a command value instructing a rotation state of the motor for moving the movable part 5 to a desired position, and supplies the command value to the motor 9. For example, the press apparatus 1 may include a control unit 12 that supplies command values ​​to each of the first motor 9a and the second motor 9b.

[0030] The control unit 12 may determine the command value based on, for example, information indicating the position of the movable part 5 acquired from a position measuring device that detects the position of the movable part 5 relative to the die or punch. The control unit 12 may also determine the command value based on, for example, information indicating the shape of a press-molded product press-molded by the press device 1 or a plate material to be press-molded. In this way, the control unit 12 may determine the command value based on at least one of the information indicating the position of the movable part 5 and the information indicating the shape of the press-molded product or the plate material to be press-molded.

[0031] The control unit 12 can be configured, for example, by a computer including a processor and a storage device (memory). The processor executes a program stored in the storage device to realize a function of supplying a command value to the motor 9. As an example, the control unit 12 determines the position or amount of movement of the movable part 5 based on an external input and / or data previously recorded in the memory, and determines a command value indicating the rotation state of the motor required for this movement. The control unit 12 outputs the command value to the motor 9.

[0032] The control unit 12 supplies command values ​​to the first motor 9a and the second motor 9b independently. Therefore, the amount of rotation of the first motor 9a and the amount of rotation of the second motor 9b can be controlled independently. For example, the attitude of the movable part 5 can be controlled by adjusting the balance between the amount of rotation of the first motor 9a and the amount of rotation of the second motor 9b. For example, the movable part 5 can be tilted slightly toward the second motor 9b by rotating the first motor 9a without rotating the second motor 9b and moving one wedge-shaped jig 71a closer to the other wedge-shaped jig 71b that is stationary.

[0033] In the example shown in Fig. 1, the press device 1 further includes a biasing member 10 that biases the movable part 5 in a direction to return against the force pressing the movable part 5 into the punch 6. The biasing member 10 biases the movable part 5 in a direction to push it out of the punch 6, i.e., in a direction from the punch 6 toward the die 2. The biasing member 10 contracts when a force stronger than the biasing force is applied in a direction to press the movable part 5 into the punch 6. This allows the movable part 5 to move relatively to the punch 6. The biasing member 10 is, for example, a gas cylinder, an elastic body such as a spring, or a hydraulic cylinder.

[0034] The urging member 10 is disposed deeper than the movable part 5 in the space where the movable part 5 is pressed into the punch 6. The urging member 10 supports the base 72 from below. The urging member 10 is disposed on a support base 11. The support base 11 is disposed on a fixed surface BL such as a bolster or a floor. The urging member 10 allows the movable part 5, the conversion mechanism (wedge-shaped jigs 71a, 71b, base 72), the rotating shaft 8, and the motor 9 to move together relative to the punch 6. The motor 9 moves in the pressing direction together with the movable part 5 relative to the punch 6.

[0035] The press device 1 further includes a biasing member 3 that biases the movable part 4 in a direction to return against the force pressing the movable part 4 into the die 2. The biasing member 3 biases the movable part 4 in a direction to push it out of the die 2, i.e., in a direction from the die 2 toward the punch 6. The biasing member 3 contracts when a force stronger than the biasing force is applied in a direction to press the movable part 4 into the die 2. This allows the movable part 4 to move relatively to the die 2. The biasing member 3 is, for example, an elastic body such as a gas cylinder or a spring, or a hydraulic cylinder. The die 2 is provided on a slide S. The slide S moves in the pressing direction PD by a lifting device (not shown).

[0036] (Example of operation) 3A to 3D are diagrams showing an example of press molding using the press device 1 shown in FIG. 1. In this example, the pressing direction is the pressure direction of the plate material. The movable part 4 is a die side pad. The movable part 5 is a punch side pad. The movable part 5 is disposed in a state where it protrudes outward from the pressure surface 6u of the punch 6, and can be pressed down to the same height as the pressure surface 6u of the punch 6.

[0037] The die 2 has a recess 2a on its inner side that corresponds to the shape of the press-molded product. The punch 6 has a protrusion that corresponds to the recess 2a of the die 2. The upper surface of this protrusion becomes a pressing surface 6u that presses the plate material B. The movable part 5 is movable in the pressing direction (pressing direction) by a biasing member 10 (see FIG. 1). The movable part 4 is movable in the pressing direction via a biasing member 3. Furthermore, the movable part 4 is movable in the pressing direction together with the movable part 5 while being pressed against the plate material B. The movable part 5 is disposed inside a recess formed in the pressing surface 6u of the punch 6. The movable part 5 is biased toward the die 2 by a biasing member 10 (see FIG. 1) disposed at the back of the movable part 5 in the recess. Due to this biasing, the upper surface of the movable part 5 is in a state of protruding outward from the pressing surface 6u of the punch 6.

[0038] In the press device 1, with the movable part 5 protruding outward from the pressure surface 6u of the punch 6, the die 2 and the punch 6 are moved relatively close to each other while pressing the movable part 4 and the movable part 5 against the plate material B, thereby press-molding the plate material B. At the bottom dead center of molding, the plate material B is press-molded until the movable part 5 is at the same height as the pressure surface 6u of the punch 6.

[0039] More specifically, first, as shown in FIG. 3A, in a state where the movable part 5 protrudes outward from the pressing surface 6u of the punch 6, the die 2 and the movable part 4 are lowered while pressing the movable part 4 against the sheet material B, so that the sheet material B is press-molded between the die 2 and the punch 6. At this time, the relative position of the movable part 5 with respect to the punch 6, that is, the height (protrusion amount) H of the upper surface of the movable part 5 with respect to the pressing surface 6u of the punch 6, is fixed. In the sheet material B to be molded, a sag Ba is generated in the sheet material B according to the height (protrusion amount) H of the upper surface of the movable part 5 with respect to the pressing surface 6u of the punch 6. Then, from this state, as shown in FIG. 3B, the die 2 is lowered while controlling the sag Ba of the sheet material B to a predetermined amount, thereby continuing the press molding. As shown in FIG. 3C, the die 2 is lowered to just before the bottom dead center H of molding. At this time, the die 2 is lowered while the biasing member 3 of the movable part 4 is contracted.

[0040] In the process shown in FIG. 3A to FIG. 3C, the die 2 and the punch 6 are moved relatively close to each other while the relative position of the punch 6 with respect to the movable part 5, i.e., the protruding amount H, is fixed. From the stage shown in FIG. 3C, i.e., the stage where the movable part 4 is bottomed out against the die 2 and completely stored (the stage before the bottom dead center of the forming by the protruding amount H), the distance between the upper surface of the movable part 5 and the pressing surface 6u of the punch 6 starts to decrease. From the stage shown in FIG. 3C to the stage shown in FIG. 3D, the relative position of the punch 6 with respect to the movable part 5 changes. As shown in FIG. 3D, the plate material B is press-molded until the upper surface of the movable part 5 is at the same height as the pressing surface 6u of the punch 6. From the stage shown in FIG. 3C to the stage shown in FIG. 3D, the movable part 5 is pressed into the punch 6 while the biasing member 10 of the movable part 5 is contracted. At this time, the sag Ba formed in the plate material B flows toward the vertical wall between the punch 6 and the die 2 while being subjected to an in-plane compressive stress. As a result, a press-molded product having a hat-shaped cross section can be obtained.

[0041] In the example shown in Figures 3A to 3D, the slack Ba formed in the plate material B is caused to flow toward the vertical wall portion, thereby expanding the bending region. This makes it possible to balance the spring back and spring go of the workpiece being press-formed. As a result, it is possible to reduce shape defects in the vertical wall.

[0042] In the above example, press molding of one plate material B includes a process of bringing the die 2 relatively close to the punch 6 in a state where the relative position of the movable part 5 to the punch 6 is fixed (initial press setting state) to press mold the plate material B, and a process of bringing the die 2 relatively close to the punch 6 by changing the relative position of the movable part 5 to the punch 6 to press mold the plate material B. The relative positions of the movable part 5 and the punch 6 in the initial press setting, i.e., the protrusion amount H of the movable part 5, is controlled by the control unit 12. The protrusion amount H is an example of a setting value of the relative position between the movable part and the punch. The setting value can be controlled by a command value supplied to the motor 9 by the control unit 12.

[0043] As in the above example, the springback and spring-go of the press-formed product can be controlled by the set value of the position of the movable part. In this case, the inventors have found that in order to keep the springback or spring-go of the press-formed product within a desired range, the accuracy of the position of the movable part to be controlled is required to be relatively high. In this embodiment, as shown in FIG. 1, the position of the movable part 5 can be controlled with high accuracy by a motor 9 whose rotation amount is controlled by a command value and a conversion mechanism that converts the rotation of the motor 9 into the movement of the movable part. Therefore, the accuracy of the shape of the press-formed product can be improved by controlling the position of the movable part.

[0044] The control unit 12 may control the position of the movable part by determining a command value using data indicating the results of measuring the shape of a press-molded product press-molded by a press device or a plate material before press molding. As an example, the control unit can determine the position of the movable part based on the results of measuring the shape of a press-molded product press-molded, and supply a command value to the motor so that the movable part moves to the determined position.

[0045] Furthermore, the control unit 12 may determine the command value using the result of measuring the position of the movable part. For example, the press apparatus 1 may include a position measuring device that measures the position of the movable part relative to the punch (or die). By determining the command value based on the position of the movable part measured by the position measuring device, the position of the movable part can be controlled with higher accuracy.

[0046] It should be noted that the press forming using the movable die is not limited to the above example. For example, in the press device, either the movable part 4 or the movable part 5 may be omitted. Also, the above example is an example in which the intermediate material plate B that has been bent in advance is press-formed, but the press device may be one that presses a flat plate (blank) that has not been bent.

[0047] In general, in bending, the movable part 4 on the die side is often set to prevent the plate material from shifting in position. In other words, in a shape that is unlikely to shift in position, the movable part 4 on the die side may be omitted. In the bending examples shown in Figs. 3A to 3D, the movable part 4 may also be omitted.

[0048] (Modification) FIG. 4 is a side view showing a press device 1 in a modified example of this embodiment. The configuration shown in FIG. 4 differs from the configuration shown in FIG. 1 in that there is only one motor 9 and one rotating shaft 8 that are the power sources for moving the movable part 5. In the example shown in FIG. 4, the pair of wedge-shaped jigs 71a and 71b are formed with female thread grooves so that they move toward each other or away from each other as the rotating shaft 8 rotates. For example, the direction of the helical line of the female thread of one wedge-shaped jig 71a can be opposite to the direction of the helical line of the female thread of the other wedge-shaped jig 71b. In this way, the pair of wedge-shaped jigs 71a and 71b can be moved in the direction of the rotating shaft by one motor 9.

[0049] FIG. 5 is a side view showing a press apparatus 1 in another modified example of this embodiment. The press apparatus 1 shown in FIG. 5 has a pair of wedge-shaped jigs 71a and 71b arranged on a support surface 72s of a base 72, similar to the press apparatus 1 shown in FIG. 4. One wedge-shaped jig 71a of the pair of wedge-shaped shafts 71a and 71b has a female screw groove that meshes with a male screw groove of a rotating shaft 8 of a motor 9. The other wedge-shaped jig 71b is fixed to the base 72. That is, one wedge-shaped jig 71a is slidable in the direction of the rotating shaft 8 relative to the base 72. The other wedge-shaped jig 71b is fixed to the base 72. Each of the pair of wedge-shaped jigs 71a and 71b has an inclined surface inclined with respect to the pressing direction, and has an inclined surface 71au and 71bu that slidably contacts the bottom surfaces 5ad and 5bd of the movable part 5. The inclined surfaces 71au, 71bu of the pair of wedge-shaped jigs 71a, 71b are inclined so that the surface closer to the opposing wedge-shaped jig is lower. The bottom surfaces 5ad, 5bd of the movable part 5 have the same inclination angle as the inclined surfaces of the pair of wedge-shaped jigs 71a, 71b.

[0050] In the example shown in FIG. 5, one wedge-shaped jig 71a moves in the direction of the rotating shaft 8 as the rotating shaft 8 rotates. When one wedge-shaped jig 71a moves in a direction approaching the other wedge-shaped jig 71b, the wedge-shaped jig 71a pushes the movable part 5 in a direction away from the motor 8 in the direction of the rotating shaft 8. The movement of the movable part 5 in a direction away from the motor 8 is restricted by the inclined surface 71bu of the other wedge-shaped jig 71b. The movable part 5 moves away from the base 72 while sliding against the inclined surface 71bu. When one wedge-shaped jig 71a moves in a direction away from the other wedge-shaped jig 71b, the movable part 5 moves toward the base 72. In this way, the rotation of the rotating shaft 8 is converted into the movement of the wedge-shaped jig 71a in the rotation axis direction, which is further converted into the movement of the movable part 5 in the pressing direction. With this configuration, the amount of movement of the movable part 5 relative to the amount of rotation of the rotary shaft 8 can be made small.

[0051] In the configuration shown in FIG. 5, the movable part 5 may be movable in the direction of the rotation axis 8. In the example shown in FIG. 5, there is a gap between the side surfaces 5as, 5bs on both sides of the movable part 5 in the direction of the rotation axis 8 and the inner surfaces 6as, 6bs of the punch 6. When the wedge-shaped jig 71a moves in the direction of the rotation axis, the movable part 5 moves in the pressing direction and also in the direction of the rotation axis. In the configuration shown in FIG. 1, there may be a gap between the side surfaces on both sides of the movable part 5 in the direction of the rotation axis 8 and the inner surface of the punch 6, or they may be slidable against each other.

[0052] FIG. 6 is a side view showing a press device 1 in yet another modified example of this embodiment. The press device 1 shown in FIG. 6 has one wedge-shaped jig 71a arranged on a support surface 72s of a base 72. The wedge-shaped jig 71a has a female screw groove that meshes with a male screw groove of a rotating shaft 8 of a motor 9. The wedge-shaped jig 71a is slidable in the direction of the rotating shaft 8 relative to the base 72. The wedge-shaped jig 71a has an inclined surface 71au inclined with respect to the pressing direction and a bottom surface 71ad that slides with the base 72. The inclined surface 71au is in slidable contact with the bottom surface 5ad of the movable part 5. The inclined surface 71au is inclined so that the side farther from the motor 8 is lower. The bottom surface 5ad of the movable part 5 has an inclination at the same angle as the inclined surface 71au of the wedge-shaped jig 71a. Of the side surfaces 5as and 5bs on both sides in the rotation axis direction of the movable part 5, the side surface 5bs opposite the motor 8 is slidable against an inner surface 6bs of the punch 6. The inner surface 6bs of the punch 6 is a surface fixed to the base 72.

[0053] In the example shown in FIG. 6, the wedge-shaped jig 71a moves in the direction of the rotating shaft 8 as the rotating shaft 8 rotates. When the wedge-shaped jig 71a moves in a direction away from the motor 8, the wedge-shaped jig 71a pushes the movable part 5 in a direction away from the motor 8 in the direction of the rotating shaft 8. The movement of the movable part 5 in the direction away from the motor 8 is restricted by the inner surface 6bs of the punch 6. The movable part 5 moves away from the base 72 while sliding against the inner surface 6bs of the punch 6. When the wedge-shaped jig 71a moves in a direction toward the motor 8, the movable part 5 moves toward the base 72. In this way, the rotation of the rotating shaft 8 is converted into the movement of the wedge-shaped jig 71a in the rotation axis direction, which is further converted into the movement of the movable part 5 in the pressing direction. With this configuration, the movement amount of the movable part 5 relative to the rotation amount of the rotating shaft 8 can be reduced.

[0054] The press device 1 in FIG. 1 and FIGS. 4 to 6 all have the following configuration. That is, the press device has at least one motor and a rotating shaft connected to the motor and rotating with the rotation of the motor. The rotating shaft has a male screw groove. The conversion mechanism includes a base having a support surface perpendicular to the pressing direction, and at least one wedge-shaped jig arranged between the base and the movable part. The wedge-shaped jig has a bottom surface that slidably contacts the support surface of the base, and an inclined surface that is inclined with respect to the pressing direction and slidably contacts the bottom surface of the movable part. The wedge-shaped jig has a female screw groove that meshes with the male screw groove of the rotating shaft. The inclined surface of the wedge-shaped jig is inclined so that the side farther from the motor is lower. The bottom surface of the movable part includes an inclined surface that has an inclination at the same angle as the inclined surface of the wedge-shaped jig. When a force is applied in a direction away from the motor in the direction of the rotating shaft, the movable part can slide against a restricting surface that restricts the movement of the movable part in the direction of the rotating shaft. With this configuration, when the wedge-shaped jig moves in a direction away from the motor due to the rotation of the rotating shaft, the movable part moves in a direction away from the base while sliding against the regulating surface. When the wedge-shaped jig moves in a direction toward the motor, the movable part moves in a direction toward the base. In this way, the rotation of the rotating shaft is converted into a movement in the rotation axis direction of the wedge-shaped jig, which is further converted into a movement in the pressing direction of the movable part. With this configuration, the movement amount of the movable part relative to the rotation amount of the rotating shaft can be reduced. In the examples of Figs. 1 and 4, the inclined surfaces 71au and 71bu of the wedge-shaped jigs 71a and 71b are an example of the regulating surface. In the example of Fig. 5, the inclined surface 71bu of the wedge-shaped jig 71b is an example of the regulating surface. In the example of Fig. 6, the side surface 6bs of the punch 6 is an example of the regulating surface.

[0055] The conversion mechanism is not limited to the above example. For example, the rotating shaft connected to the motor may be in the pressing direction. In this case, the movable part may be formed with a female screw groove that meshes with a male screw groove on the outer periphery of the rotating shaft. The movable part moves in the pressing direction due to the rotation of the rotating shaft. The amount of movement of the movable part in the pressing direction can be controlled by controlling the amount of rotation of the motor.

[0056] As another example, the conversion mechanism may include a mechanism that converts the rotation of the rotation axis into rotation around an axis in the press direction, with the rotation axis perpendicular to the press direction. For this conversion, a gear mechanism such as a bevel gear or a worm gear can be used. In this case, a male screw groove on the outer periphery of the rotation axis in the press direction can be configured to mesh with a female screw groove formed on the movable part. This allows the rotation around the axis in the press direction to be converted into linear motion in the press direction.

[0057] As another example, the conversion mechanism may include a rack-and-pinion mechanism or a planetary gear mechanism that converts rotation of a rotation axis perpendicular to the press direction into linear motion in the press direction.

[0058] The configuration of the urging member is not limited to the above example. For example, a hydraulic cushion supporting the movable part 5 may be used as the urging member. A press device without a urging member is also one of the embodiments of the present invention. In the above example, in the pressing process, the movable part 5 is pushed into the punch 6 while being urged by the urging member 10 until the top surface of the movable part 5 is flush with the pressure surface 6u of the punch 6 (see FIG. 3D). In contrast, a configuration may be used in which the relative positions of the movable part 5 and the punch 6 do not change in the process of manufacturing one press-molded product.

[0059] As an example, in the configuration shown in FIG. 1, FIG. 4, FIG. 5, or FIG. 6, the biasing member 10 may be omitted. In this case, the base 72 is fixed to the punch 6. Also, the motor 9, the rotating shaft 8, and the conversion mechanism are fixed to the punch 6. In this case, by changing the position of the movable part 5, press-molded products of different shapes can be manufactured. That is, press molding can be performed with a die of a different shape without making a new die. Also, since the position of the movable part 5 can be precisely adjusted, press-molded products of slightly different shapes can be manufactured without replacing the die.

[0060] In the above embodiment, the relative movement of the movable part 5 provided on the punch 6 with respect to the punch 6 is adjusted by the motor 9. As a modified example, for example, the relative movement of the movable part provided on the die with respect to the die may be adjusted by the motor. The movable part may be provided on at least one of the die or the punch. The movable part is movable in the press direction with respect to the die or punch on which the movable part is provided. The conversion mechanism converts the rotation of the rotation axis into linear movement of the movable part in the press direction with respect to the die or punch (on which the movable part is provided).

[0061] Although one embodiment of the present invention has been described above, the above-described embodiment is merely an example for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and carried out without departing from the spirit of the present invention. [Explanation of symbols]

[0062] 1: Press equipment 2: Die 4: Movable part (die side) 5: Movable part (punch type) 6: Punch 10: Pressurizing member 12: Control unit

Claims

1. Die and A punch that is movable relative to the die in a pressing direction; a movable part provided on at least one of the die and the punch and movable in the pressing direction relative to at least one of the die and the punch; a motor whose rotation is controlled by a command value for achieving a target rotation state; a rotating shaft connected to the motor and rotating with the rotation of the motor; a conversion mechanism for converting the rotation of the rotation shaft into a linear movement of the movable part in the pressing direction relative to at least one of the die and the punch, a relative position of the movable part with respect to at least one of the die and the punch on which the movable part is provided changes due to the rotation of the motor; The press device further includes a biasing member that biases the movable part in a return direction against a force that presses the movable part into at least one of the die and the punch.

2. The press device according to claim 1, A press apparatus, wherein the rotation axis of the motor is perpendicular to the pressing direction.

3. The press device according to claim 2, The rotating shaft has a male screw groove, The conversion mechanism is A table having a support surface perpendicular to the pressing direction; a pair of wedge-shaped jigs arranged side by side in a direction in which the rotation shaft extends between the base and the movable part, Each of the pair of wedge-shaped jigs has a bottom surface that is in slidable contact with the support surface of the base, and an inclined surface that is inclined with respect to the pressing direction and is in slidable contact with the bottom surface of the movable part, The inclined surfaces of each of the pair of wedge-shaped jigs are inclined so that the surface closer to the opposing wedge-shaped jig is lower, a bottom surface of the movable portion includes an inclined surface having the same angle of inclination as each of the inclined surfaces of the pair of wedge-shaped jigs; The pair of wedge-shaped jigs have female thread grooves that mesh with the male thread grooves of the rotating shaft, The pair of wedge-shaped jigs have female thread grooves formed therein such that they move toward each other or away from each other as the rotating shaft rotates.

4. The press device according to claim 2, The motor includes a first motor and a second motor, The rotating shaft includes a first rotating shaft connected to a first motor and a second rotating shaft coaxial with the first rotating shaft and connected to the second motor, The first rotating shaft and the second rotating shaft have male screw grooves, The conversion mechanism is A table having a support surface perpendicular to the pressing direction; a pair of wedge-shaped shafts arranged side by side in a direction in which the rotation shaft extends between the base and the movable part, Each of the pair of wedge-shaped shafts has a bottom surface that is in slidable contact with the support surface of the base, and an inclined surface that is inclined with respect to the press direction and is in slidable contact with the bottom surface of the movable part, The inclined surfaces of each of the pair of wedge-shaped jigs are inclined so that the surface closer to the opposing wedge-shaped jig is lower, a bottom surface of the movable portion includes an inclined surface having the same angle of inclination as each of the inclined surfaces of the pair of wedge-shaped jigs; One of the pair of wedge-shaped jigs has a female screw groove that meshes with the male screw groove of the first rotating shaft, The other of the pair of wedge-shaped jigs has a female screw groove that meshes with the male screw groove of the second rotating shaft. A press device.

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