JP2018114513A - Press device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press device capable of lowering a speed for deforming an object to be formed while preventing deterioration of a lubrication state of a mechanical part in the press device which transmits a motion of a rotation shaft to a slide and forms the object to be formed.SOLUTION: A press device includes: a bed which retains a first mold; a first slide (18) which can advance and retract; a second slide (20B) which is provided on the bed side of the first slide, permits proximity and separation for the first slide along the advancing and retracting direction of the first slide and is retained such that the second mold is brought into non-contact with the first mold and is opposed to the first mold; a fluid chamber (R) which is arranged between the first slide and the second slide and generates a pressure for performing proximity and separation of the second slide for the first slide; and a control part (2) which controls supply and discharge of actuation fluid to the fluid chamber. Therein, the control part (2) permits proximity control for discharging actuation fluid of the fluid chamber such that the second slide approaches the first slide with a relative speed of a moving speed of the first slide or less in such a period that the first slide approaches the bed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a press apparatus that performs forging and the like.

  2. Description of the Related Art Conventionally, there is a press device that forges a workpiece by the power of a motor (see, for example, Patent Document 1). In such a press device, the motion of the rotating shaft that is rotated by the power of the motor is converted into a translational motion and transmitted to the slide. And a to-be-molded object is pressurized between the upper metal mold | die hold | maintained at the lower part of a slide, and the lower metal mold | die hold | maintained at the bed, and shaping | molding, such as forging, is performed.

  In recent years, a forging method using a superplastic phenomenon has been put into practical use. The superplastic phenomenon is a phenomenon in which a large amount of elongation is obtained in a material when the specific material is deformed at a low speed. Forging using the superplastic phenomenon is called superplastic forging. Superplastic forging has the advantage of being able to form complex shapes. In superplastic forging, since the deformation stress of the material is reduced, the maximum load of the press device can be reduced, and the press device can be reduced in size.

JP 2007-31532 A

  In superplastic forging, the mold is moved at a low speed to deform the workpiece at a low speed. The speed at which the mold is moved depends on the composition of the molding, but is very slow, for example, 0.01 mm / second or 0.001 mm / second.

  Some mechanical presses that move a slide by driving a rotating shaft can control the speed of the slide by controlling the driving of the rotating shaft. For this reason, it was thought that superplastic forging could be possible by controlling the slide speed to a low speed at which the superplastic phenomenon appears using a mechanical press.

  However, in a mechanical press device, if the slide is moved at an ultra-low speed with a load applied, it is difficult to form a lubricating film on the sliding surface of the mechanical portion that transmits the power of the rotating shaft to the slide. For this reason, the lubrication state of the machine part deteriorates, and there is a risk that stable operation is hindered.

  The present invention provides a press apparatus for forming a molding by transmitting the motion of a rotating shaft to a slide, and capable of preventing deterioration of the lubrication state of a machine part even if the molding is deformed at a low speed. The purpose is to do.

The present invention
A bed holding a first mold;
A first slide capable of advancing and retreating in a direction of approaching and separating from the bed;
A rotating shaft that can be rotated by power input;
A transmission mechanism that converts the rotation of the rotary shaft into a translational motion and transmits the translation to the first slide, and advances and retracts the first slide;
It is provided on the bed side of the first slide, can be moved closer to and away from the first slide along the advancing and retreating direction of the first slide, and a second mold is not in contact with the first mold and the first slide A second slide held to face one mold;
A fluid chamber that is disposed between the first slide and the second slide and generates a pressure that causes the second slide to approach and separate from the first slide;
A control unit for controlling supply and discharge of the working fluid to and from the fluid chamber;
With
The controller is
Proximity control is possible to discharge the working fluid in the fluid chamber so that the second slide approaches the first slide at a relative speed equal to or less than the moving speed of the first slide during the period when the first slide approaches the bed. Press machine.

The present invention also provides:
Bed and
A first slide capable of moving forward and backward in a direction of approaching and separating from the bed and holding a first mold;
A rotating shaft that can be rotated by power input;
A transmission mechanism that converts the rotation of the rotary shaft into a translational motion and transmits the translation to the first slide, and advances and retracts the first slide;
The first mold is provided on the first slide side of the bed, can be moved close to and away from the bed along the advancing and retreating direction of the first slide, and the second mold is not in contact with the first mold and the first mold A second slide held to face the mold;
A fluid chamber disposed between the bed and the second slide, and generating a pressure that causes the second slide to approach and separate from the bed;
A control unit for controlling supply and discharge of the working fluid to and from the fluid chamber;
With
The controller is
A pressing device capable of proximity control for discharging the working fluid in the fluid chamber so that the second slide approaches the bed at a speed equal to or lower than the moving speed of the first slide during the period in which the first slide approaches the bed. It is.

  According to the present invention, in a press device for forming a molding by transmitting the motion of the rotating shaft to the slide, deterioration of the lubrication state of the machine part can be prevented even if the molding is deformed at a low speed.

It is a block diagram which shows the press apparatus of embodiment of this invention. It is a timing chart explaining operation | movement of the 1st example of the press apparatus which concerns on embodiment. It is a timing chart explaining operation | movement of the 2nd example of the press apparatus which concerns on embodiment. It is a block diagram which shows the modification of the press apparatus which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram illustrating a press apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, the press device 1 according to this embodiment includes a crown 21, an upright 22, a bed 23, a bolster 24, a first slide 18, a guide 19, a drive mechanism 100, and a piston cylinder 20. Further, the press device 1 includes a hydraulic circuit 70, a control unit 2, a first position sensor 61, and a second position sensor 62. A lower mold 32 is held on the bed 23 via a bolster 24. At the lower part of the piston cylinder 20, the upper mold 31 is held so as not to contact the lower mold 32 and to face the lower mold 32. In the embodiment of FIG. 1, the lower mold 32 corresponds to an example of a first mold according to the present invention, and the upper mold 31 corresponds to an example of a second mold according to the present invention.

  The crown 21, the upright 22, and the bed 23 are frame portions that support the drive units of the press device 1. The crown 21, the upright 22, and the bed 23 are fastened to each other by inserting a tie rod 25a therein and tightening the tie rod nut 25b. The bolster 24 is fixed to the upper part of the bed 23.

  The first slide 18 is guided by the guide 19 so as to be able to advance and retract in the vertical direction (corresponding to the direction approaching and separating from the bed 23), for example. The guide 19 is supported by a frame portion such as the upright 22.

  The drive mechanism 100 generates power for driving the first slide 18 and transmits power. The drive mechanism 100 includes a motor 11, a transmission shaft 12, a speed reducer 13, an eccentric shaft 14, and a connecting rod 15. Among these, the transmission shaft 12 corresponds to an example of a rotating shaft according to the present invention. The reduction gear 13, the eccentric shaft 14, and the connecting rod 15 correspond to an example of a transmission mechanism according to the present invention.

  The motor 11 is fixed to a frame portion such as a crown 21. The eccentric shaft 14 has a main shaft portion 14a rotatably supported by a frame portion such as the crown 21 or the upright 22. The speed reducer 13 is supported by a frame portion such as the crown 21 or the upright 22 via a frame member.

  The motor 11 is a motor capable of controlling the amount of rotation, such as a servo motor. The transmission shaft 12 is rotationally driven by the motor 11. That is, the transmission shaft 12 can be rotated by inputting the power of the motor 11. The eccentric shaft 14 has a hollow portion that penetrates along the rotation axis. The transmission shaft 12 is disposed so as to be rotatable relative to the eccentric shaft 14 in the hollow portion. The speed reducer 13 decelerates the rotational motion of the transmission shaft 12 and transmits it to the eccentric shaft 14.

  The eccentric shaft 14 has an eccentric portion 14b that is eccentric with respect to the main shaft portion 14a, and the eccentric portion 14b is connected to the connecting rod 15. The connecting rod 15 connects the eccentric shaft 14 and the first slide 18, converts the rotational motion of the eccentric shaft 14 into a translational motion, and transmits it to the first slide 18.

  The piston cylinder 20 has a piston 20A and a second slide 20B. The second slide 20B is provided with a cylinder portion into which the piston 20A is slidably fitted. The second slide 20B has an oil chamber R inside the cylinder portion, and the hydraulic oil in the oil chamber R is increased or decreased by the hydraulic circuit 70, whereby the second slide 20B moves forward and backward relative to the piston 20A. . Thereby, the piston cylinder 20 expands and contracts. An oil seal is provided between the piston 20A and the cylinder portion of the second slide 20B, and the oil pressure in the oil chamber R is maintained.

  The piston cylinder 20 is attached to the lower part (the bed 23 side) of the first slide 18 so that the expansion / contraction direction is the same as the advance / retreat direction of the first slide 18. In the example of FIG. 1, the piston 20 </ b> A is fixed to the lower part of the first slide 18, and the second slide 20 </ b> B is attached to the first slide 18 so as to advance and retreat in the vertical direction. A configuration in which the cylinder is fixed to the lower portion of the first slide 18 and a piston fitted into the cylinder is combined as a second slide so as to be movable back and forth with respect to the first slide 18 may be employed. With these configurations, the second slide 20 </ b> B can be moved closer to and away from the first slide 18.

  The lateral width of the oil chamber R of the piston cylinder 20 is preferably larger than the lateral width of the portion of the upper mold 31 that contacts the workpiece. Moreover, it is preferable that the width in the depth direction of the oil chamber R is wider than the width in the depth direction of the portion of the upper mold 31 that contacts the workpiece. By making the oil chamber R wide in this way, it is possible to easily generate a large pressure applied to the upper mold 31 by the piston cylinder 20. The width in the height direction of the oil chamber R is preferably smaller than at least the lateral width or depth width of the oil chamber R. Thereby, the displacement of the 2nd slide 20B resulting from compression of hydraulic oil can be made small. Here, the lateral direction is the axial direction of the eccentric shaft 14, and the depth direction is a direction perpendicular to the forward / backward direction of the first slide 18 and perpendicular to the axial direction of the eccentric shaft 14. The height direction is the forward / backward direction of the second slide 20B.

  The first position sensor 61 detects the position of the first slide 18 in the advance / retreat direction. As the first position sensor 61, for example, a measuring instrument that measures the distance between the first slide 18 and the bed 23 can be employed.

  The second position sensor 62 detects the position of the second slide 20B in the forward / backward direction with respect to the piston 20A. That is, the second position sensor 62 detects the amount of expansion / contraction of the piston cylinder 20. As the second position sensor 62, for example, a measuring instrument that measures the distance between the piston 20A and the second slide 20B can be employed.

  The hydraulic circuit 70 includes tanks 71 and 72, a motor pump 73, a first flow control valve 74, a second flow control valve 75, and a relief valve 76. The motor pump 73 is electrically driven to generate hydraulic pressure. The first flow control valve 74 sends hydraulic oil to the oil chamber R of the piston cylinder 20 based on the hydraulic pressure of the motor pump 73. The first flow rate control valve 74 is a control valve capable of switching between supply and non-supply of the hydraulic oil under the control of the control unit 2 and adjusting the supply amount of the hydraulic oil in a state where the hydraulic oil is being supplied. . The second flow rate control valve 75 is a control valve that switches between a state in which the hydraulic oil of the piston cylinder 20 is discharged into the tank 71 and a non-discharge state under the control of the control unit 2. Furthermore, the second flow rate control valve 75 can adjust the discharge amount of the hydraulic oil in a state where the hydraulic oil is discharged under the control of the control unit 2. The relief valve 76 is a safety valve, and keeps the pressure of the oil passage connected to the oil chamber R of the piston cylinder 20 below the upper limit.

  The control unit 2 controls the advance / retreat position and the advance / retreat speed of the first slide 18 by controlling the rotation amount of the motor 11. The control unit 2 may more accurately control the advance / retreat position and advance / retreat speed of the first slide 18 by feedback control based on the detection value of the first position sensor 61.

  Further, the control unit 2 controls the expansion / contraction amount and the expansion / contraction speed of the piston cylinder 20 by supplying / discharging (supplying / discharging) the hydraulic oil to / from the oil chamber R by driving the hydraulic circuit 70. For example, the controller 2 supplies the hydraulic oil from the motor pump 73 to the oil chamber R of the piston cylinder 20 by opening the first flow control valve 74 and closing the second flow control valve 75 of the hydraulic circuit 70. The piston cylinder 20 is extended. As a result, the second slide 20 </ b> B descends relative to the first slide 18. Further, the control unit 2 controls the extension speed of the piston cylinder 20 by controlling the amount of hydraulic oil supplied by the first flow control valve 74. Thereby, the relative lowering speed of the second slide 20B with respect to the first slide 18 is controlled. On the other hand, the control unit 2 closes the first flow rate control valve 74 and opens the second flow rate control valve 75 to discharge the hydraulic oil from the oil chamber R of the piston cylinder 20 and contract the piston cylinder 20. As a result, the second slide 20 </ b> B rises relative to the first slide 18. Furthermore, the control unit 2 controls the contraction speed of the piston cylinder 20 by controlling the amount of hydraulic oil discharged from the second flow control valve 75. Thereby, the relative ascending speed of the second slide 20B with respect to the first slide 18 is controlled. Furthermore, the control unit 2 may more accurately control the expansion / contraction amount and the expansion / contraction speed of the piston cylinder 20 by performing feedback control based on the detection value of the second position sensor 62. Thereby, the relative advance / retreat position and advance / retreat speed of the second slide 20B with respect to the first slide 18 are more accurately controlled.

<Description of operation of first example of molding cycle>
FIG. 2 is a timing chart for explaining the operation of the first example of the press device according to the embodiment. In FIG. 2, the vertical axis represents the movement position of the first slide 18 in the forward / backward direction. The moving position of the first slide 18 corresponds to the distance from the bed 23 to the first slide 18. The moving position of the upper mold 31 corresponds to the distance from the bed 23 to the upper mold 31. The moving position of the second slide 20B represents the relative moving position of the second slide 20B with respect to the first slide 18, and corresponds to the distance from the first slide 18 to the second slide 20B. The graph line indicating the movement position of the upper mold 31 and the graph line indicating the movement position of the first slide 18 are offset so as to overlap at the start time t1 of the molding cycle.

  At the start time t1 of the molding cycle, the second slide 20B is held at the initial position p0 farthest from the first slide 18 in one molding cycle. That is, at the start time t1 of the molding cycle, the piston cylinder 20 is in the most extended state during the molding cycle. The initial position p0 of the second slide 20B may be the position when the piston cylinder 20 reaches the maximum extension amount or the position when the extension amount obtained by subtracting the margin from the maximum extension amount. The start time t1 of the molding cycle may be set to a time immediately before the pressurization of the molding object is started between the upper mold 31 and the lower mold 32.

  When the first slide 18 descends and the period T1 during which pressurization of the molding is started between the upper mold 31 and the lower mold 32 is reached, the control unit 2 sets the lowering speed of the first slide 18. Control to a predetermined low speed. At this time, the lowering speed of the first slide 18 is controlled to a low value within a range in which no seizure occurs in a portion where the load of the driving mechanism 100 is applied.

  Subsequently, when the pressure applied to the molding is increased and the molding period T2 during which the molding is deformed, the control unit 2 keeps the lowering speed of the first slide 18 while the oil in the piston cylinder 20 is maintained. Control is performed to discharge the hydraulic oil from the chamber R at a predetermined speed. Thereby, the piston cylinder 20 contracts, and the second slide 20B is relatively displaced in a direction approaching the first slide 18. The relative moving speed of the second slide 20B with respect to the first slide 18 is controlled to be equal to or lower than the lowering speed of the first slide 18. Thereby, the upper die 31 is lowered at a low speed. As an example, when the descending speed of the first slide 18 is controlled to 0.1 mm / sec and the relative speed of the second slide 20B is controlled to 0.09 mm / sec, the descending speed of the upper mold 31 is 0.01 mm / sec. Second. The descending speed of the upper die 31 is set to a value of a slow descending speed that realizes superplastic forging, for example. Hereinafter, the control for lowering the upper mold 31 at such a low speed is referred to as “proximity control”.

  In the molding period T2 in which the proximity control is performed, the object to be molded is pressurized and deformed at a low speed between the upper mold 31 and the lower mold 32, and the molding by superplastic forging is completed. The proximity control may be performed, for example, until just before the first slide 18 reaches the bottom dead center.

  When the forging is completed, the control unit 2 drives the motor 11 to raise the first slide 18 to the initial position of the molding cycle. Further, in the period T <b> 3 when the first slide 18 is raised, the control unit 2 performs control to supply hydraulic oil to the oil chamber R of the piston cylinder 20. As a result, the piston cylinder 20 extends, and the movement position of the second slide 20B relative to the first slide 18 is returned to the initial position p0. Then, one molding cycle is completed.

  According to such a molding cycle, the super mold forging of the workpiece can be realized by the upper die 31 descending at a very low speed by proximity control. Further, the slow lowering of the upper mold 31 occurs due to the difference between the moving speed of the first slide 18 and the moving speed of the second slide 20B. For this reason, even when the upper mold 31 is lowered at a low speed, the first slide 18 does not need to be lowered at a low speed. Therefore, even if superplastic forging is performed, it is possible to prevent the lubrication state from deteriorating in the load portion of the drive mechanism 100 (for example, each connecting portion of the eccentric shaft 14, the connecting rod 15 and the first slide 18), and stable operation can be achieved. It can be carried out.

<Description of operation of second example of molding cycle>
FIG. 3 is a timing chart for explaining the operation of the second example of the press apparatus according to the embodiment. The meaning of the movement position of each graph line in FIG. 3 is the same as that in FIG.

  In the second example of the molding cycle, the proximity control for moving the upper mold 31 at a slow speed and the control for returning the piston cylinder 20 to the initial state are alternately repeated a plurality of times, thereby extending the stroke for superplastic forging. It is an example.

  At the start time t1 of the molding cycle, the second slide 20B is held at the initial position p0 farthest from the first slide 18 in one molding cycle.

  When the first slide 18 descends and the molding period T11 in which the workpiece is deformed is reached, in the initial period T12, the control unit 2 controls the upper metal plate as shown in the first example of the molding cycle. Proximity control for moving the mold 31 at a low speed is executed.

  Next, when the piston cylinder 20 contracts to a predetermined length, in the subsequent period T13, the control unit 2 supplies hydraulic oil to the piston cylinder 20 and sets the movement position of the second slide 20B relative to the first slide 18 to the initial position. Return to p0. At the same time, the control unit 2 raises the first slide 18 by the same amount as the extension amount of the piston cylinder 20. Hereinafter, the control shown in the period T13 is referred to as “return control”.

  The amount of change in the movement position of the upper mold 31 in one return control is controlled to be smaller than the amount of change in the movement position of the upper mold 31 in one proximity control. Preferably, the control unit 2 holds the load applied between the upper mold 31 and the lower mold 32 so that the movement position of the upper mold 31 is held during the return control, or during the return control. As described above, the return control may be performed. The control for holding the movement position can be realized by the control unit 2 controlling the drive amount of the motor 11 and the discharge amount of hydraulic oil based on the outputs of the first position sensor 61 and the second position sensor 62, for example. The control for holding the load can be realized by the drive control performed by the control unit 2 based on a load measurement value using, for example, a strain sensor.

  In the molding period T11, the control unit 2 repeatedly performs proximity control (periods T12, T14, T16, T18) and return control (periods T13, T15, T17) alternately. Thereby, the slow movement of the upper mold | die 31 which implement | achieves superplastic forging can be performed with a long stroke.

  In the return control, a control for increasing the shut height by the shut height adjusting device may be used in combination. The shut height refers to the length from the bottom dead center position of the first slide 18 to the upper surface of the bed 23. The shut height adjusting device is a device that enables the length of the connecting portion between the connecting rod 15 and the first slide 18 to be continuously changed, for example, and the shut height is increased or decreased by changing the length of the connecting portion. By using such control together, the upper die 31 can be moved at a slow speed with a longer stroke.

  When the molding period T11 is completed, the control unit 2 raises the first slide 18 to the initial position of the molding cycle. Further, in the period T <b> 19 when the first slide 18 is raised, the control unit 2 performs control to supply hydraulic oil to the oil chamber R of the piston cylinder 20. As a result, the piston cylinder 20 extends, and the movement position of the second slide 20B relative to the first slide 18 is returned to the initial position p0. This completes one molding cycle.

  According to such a molding cycle, the super mold forging of the workpiece can be realized by the upper die 31 descending at a very low speed by proximity control. Further, the proximity control and the return control are alternately repeated a plurality of times, so that the stroke at which the upper mold 31 descends at a very low speed can be lengthened. Thereby, the superplastic forging of a molded object can be performed with a long stroke. In the molding period T11 in which the proximity control and the return control are repeated, the first slide 18 and the drive mechanism 100 can be driven at a speed that does not deteriorate the lubrication state of the drive mechanism 100. Therefore, it is possible to perform a stable operation while maintaining the lubrication state of the drive mechanism 100.

  As described above, according to the press device 1 of the present embodiment, in the mechanical press device 1 that performs the press by converting the rotational motion of the eccentric shaft 14 into the translational motion of the first slide 18, the slow speed of the molding object. Superplastic forging can be realized by pressing. Further, during the superplastic forging, the first slide 18 does not need to be moved at a very low speed, so that the lubrication state of the machine part to which the load is applied can be maintained and a stable operation can be performed.

(Modification)
FIG. 4 is a configuration diagram showing a modification of the press device according to the embodiment of the present invention.

  In the press apparatus 1A of the modification, the position where the piston cylinder 20 is fixed is changed to the upper part of the bed 23 (the first slide 18 side of the bed 23). In this case, the upper mold 31 is held at the lower part of the first slide 18, and the lower mold 32 is held at the upper part of the piston cylinder 20 via the bolster 24. In the modification, the upper mold 31 corresponds to an example of a first mold according to the present invention, and the lower mold 32 corresponds to an example of a second mold according to the present invention.

  In the modification, the hydraulic oil is supplied to or discharged from the oil chamber R of the piston cylinder 20, so that the second slide 20 </ b> B approaches and separates from the bed 23. In the proximity control, the control unit 2 lowers the first slide 18 at the first speed V1 (for example, 0.1 mm / second). At the same time, the control unit 2 discharges the hydraulic oil from the oil chamber R of the piston cylinder 20 and lowers the second slide 20B at a second speed V2 (for example, 0.09 mm / second) equal to or lower than the first speed V1. Thereby, the upper mold 31 moves relative to the lower mold 32 at a minute speed (for example, 0.01 mm / second).

  In the modified press apparatus 1A, the control of the molding cycle shown in FIG. 2 or FIG. 3 can be similarly applied. However, in FIG.2 and FIG.3, the movement position of the 2nd slide 20B is read as showing the distance from the bed 23 to the 2nd slide 20B. Further, the movement position of the upper mold 31 can be read as representing the distance from the upper mold 31 to the lower mold 32. Also in the press apparatus 1A of the modified example, superplastic forging is realized by performing low-speed deformation of the workpiece by the molding cycle shown in FIG. 2 or FIG. 3, and the lubrication state of the machine part to which the load is applied is maintained. As a result, an effect that a stable operation can be performed is exhibited.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment. For example, in the above-described embodiment, a mechanical press device using an eccentric shaft and a connecting rod as an example of a transmission mechanism that converts rotation of a rotation shaft into translational motion and transmits the translation to the first slide has been described as an example. However, the present invention can be similarly applied to a mechanical press device in which a crankshaft and a connecting rod are used as a transmission mechanism, and a link press device that does not use an eccentric shaft or a crankshaft. In the above-described embodiment, the mechanical press device in which the rotational motion is transmitted by the transmission shaft and the speed reducer has been described as an example. However, the mechanism for transmitting the rotational motion is not limited to the mechanism in the embodiment.

  Moreover, although the example which used hydraulic fluid as a working fluid was shown in the said embodiment, you may use another fluid as a working fluid. In that case, the part indicated as hydraulic pressure in the embodiment may be read as fluid pressure, and the part indicated as oil chamber may be read as fluid chamber.

  Moreover, in the said embodiment, the operation example which operates the piston cylinder 20 during a shaping | molding cycle and performs superplastic forging was demonstrated. However, the press devices 1 and 1A of the embodiment control the piston cylinder 20 so as not to operate when low-speed molding is not performed, so that the molding is performed in a molding cycle similar to that of a normal mechanical press device. Forming such as forging of objects can be performed. In the above-described embodiment, the configuration in which the first slide 18 and the second slide 20B advance and retreat in the up and down direction is shown, but the advancing and retreating direction may be other directions. Moreover, in the said embodiment, the structure using the motive power of the electric motors 11, such as a servomotor, to move the 1st slide 18 was shown. However, other power sources such as a hydraulic motor may be used as long as the movement amount of the first slide 18 can be controlled. In addition, the details shown in the embodiments can be changed as appropriate without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1, 1A Press apparatus 2 Control part 11 Motor 12 Transmission shaft 13 Reduction gear 14 Eccentric shaft 15 Connecting rod 18 1st slide 19 Guide 20 Piston cylinder 20A Piston 20B 2nd slide 21 Crown 22 Upright 23 Bed 24 Bolster 31 Upper die 32 Lower mold 70 Hydraulic circuit 71, 72 Tank 73 Motor pump 74 First flow control valve 75 Second flow control valve 76 Relief valve 100 Drive mechanism R Oil chamber (fluid chamber)

Claims (9)

A bed holding a first mold;
A first slide capable of advancing and retreating in a direction of approaching and separating from the bed;
A rotating shaft that can be rotated by power input;
A transmission mechanism that converts the rotation of the rotary shaft into a translational motion and transmits the translation to the first slide, and advances and retracts the first slide;
It is provided on the bed side of the first slide, can be moved closer to and away from the first slide along the advancing and retreating direction of the first slide, and a second mold is not in contact with the first mold and the first slide A second slide held to face one mold;
A fluid chamber that is disposed between the first slide and the second slide and generates a pressure that causes the second slide to approach and separate from the first slide;
A control unit for controlling supply and discharge of the working fluid to and from the fluid chamber;
With
The controller is
Proximity control is possible to discharge the working fluid in the fluid chamber so that the second slide approaches the first slide at a relative speed equal to or less than the moving speed of the first slide during the period when the first slide approaches the bed. Is a press device. Bed and
A first slide capable of moving forward and backward in a direction of approaching and separating from the bed and holding a first mold;
A rotating shaft that can be rotated by power input;
A transmission mechanism that converts the rotation of the rotary shaft into a translational motion and transmits the translation to the first slide, and advances and retracts the first slide;
The first mold is provided on the first slide side of the bed, can be moved close to and away from the bed along the advancing and retreating direction of the first slide, and the second mold is not in contact with the first mold and the first mold A second slide held to face the mold;
A fluid chamber disposed between the bed and the second slide, and generating a pressure that causes the second slide to approach and separate from the bed;
A control unit for controlling supply and discharge of the working fluid to and from the fluid chamber;
With
The controller is
Proximity control that allows the working fluid in the fluid chamber to be discharged so that the second slide approaches the bed at a speed equal to or lower than the moving speed of the first slide during the period when the first slide approaches the bed. apparatus. The control unit performs the proximity control at the time of molding in which a workpiece is deformed between the first mold and the second mold.
The press apparatus of Claim 1 or Claim 2. The control unit holds the position of the second slide with respect to the first slide until the proximity control is started from the start point of the molding cycle.
The press apparatus according to claim 1. The control unit holds the position of the second slide with respect to the bed from the start of the molding cycle until the proximity control is started.
The press apparatus according to claim 2. The controller is
The supply and discharge of the working fluid to and from the fluid chamber and the power input to the rotating shaft are controllable,
The second slide can be moved away from the first slide, and the first slide can be moved away from the bed.
The proximity control and the return control are alternately repeated a plurality of times during one molding cycle.
The press apparatus according to claim 1 or 4. The controller is
The supply and discharge of the working fluid to and from the fluid chamber and the power input to the rotating shaft are configured to be controllable,
The second slide can be moved away from the bed, and the first slide can be moved away from the bed.
The proximity control and the return control are alternately repeated a plurality of times during one molding cycle.
The press apparatus according to claim 2 or 5. The amount of change in the distance between the first die and the second die due to the return control is smaller than the amount of change in the distance between the first die and the second die due to the proximity control.
The press apparatus according to claim 6 or 7. The controller is
The return control is performed so that the distance between the first mold and the second mold is maintained, or the load applied to the first mold and the second mold is maintained. Do,
The press apparatus according to claim 6 or 7.

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