WO2011027720A1

WO2011027720A1 - Press machining device and shaft portion restriction device

Info

Publication number: WO2011027720A1
Application number: PCT/JP2010/064570
Authority: WO
Inventors: 俊明江波
Original assignee: 株式会社エナミ精機
Priority date: 2009-09-02
Filing date: 2010-08-27
Publication date: 2011-03-10
Also published as: JP2011073057A

Abstract

A press machining device comprises a lower die (31) including a die and a blank holder (33) which is arranged around the die and which can be moved away from a stationary plate and close to the stationary plate; an upper die (30) which cooperates with the lower die (31) to hold a workpiece (W) coated with a lubricant oil between the upper die and the lower die in order to machine the workpiece (W); and a die cushion device which supports the blank holder (33). The die cushion device includes an hydraulic cylinder (71) which biases the blank holder (33) toward the upper die (30) and which moves the blank holder (33) to approach the stationary plate while maintaining a state in which the blank holder (33) cooperates with the upper die (30) to hold the workpiece (W) therebetween when a pressing force above a predetermined value is applied to the blank holder (33) from the upper die (30), and a restriction device (75) which restricts the displacement of the blank holder (33) away from the stationary plate.

Description

Press processing device and shaft control device

The present invention relates to a press processing apparatus and a shaft control apparatus, and more particularly to a press processing apparatus including a die cushion device and a shaft control apparatus for controlling the moving direction of the shaft.

Conventionally, various types of press processing devices provided with a die cushion device have been proposed.
For example, a press machine described in Japanese Patent Application Laid-Open No. 2006-224149 includes a die, a punch, and a die cushion device, and the work object is held by sandwiching the work object between the punch and the die. Apply a drawing process.

JP, 2006-224149, A

When a workpiece is processed using the above-described conventional pressing apparatus, there may be a shortage of lubricating oil between the surface of the workpiece and the surfaces of the die and the punch.

Insufficient lubricating oil causes seizing between the punch and the die and the work, and scratches on the surface of the molded product extending along the processing direction, leading to product defects.

As means for solving such a problem, it is conceivable, for example, that the die and the punch sandwich the work and vibrate the die in the stroke direction of the die when processing the work.

When the die is vibrated, a gap is generated between the surface of the die or punch and the surface of the work, and the lubricating oil can enter this gap to suppress the occurrence of burn-in or scratch. It is also conceivable.

However, if the die is simply vibrated, the die cushion device displaces the punch according to the displacement of the die, and a gap can be positively provided between the surface of the punch or die and the work. It becomes difficult to distribute lubricating oil.

The present invention has been made in view of the above problems, and its first object is to suppress the occurrence of a portion where the oil film breaks off between a die such as a punch or a die and a work. It is an object of the present invention to provide a pressing apparatus in which the occurrence of burn-in and the like is suppressed. A second object of the present invention is to provide a shaft portion restricting device capable of selectively restricting the movement of the shaft portion.

The shaft portion restricting device according to the present invention allows the movable shaft portion to move in the first direction, and restricts the shaft portion from moving in the second direction opposite to the first direction. And a release mechanism capable of releasing the restriction of the moving direction of the shaft by the lock portion.

Preferably, an inner ring mounted on the outer peripheral surface of the shaft portion, an outer ring spaced apart from the inner ring, and a tightening member capable of tightening the outer ring are further provided. The shaft portion is rotatably provided, and the release mechanism includes an adjustment mechanism capable of adjusting the tightening force of the outer ring by the tightening member. The locking portion is disposed between the inner ring and the outer ring, and the locking portion allows the shaft to rotate in the first direction by the tightening mechanism of the tightening member being weakened by the adjusting mechanism. The tightening force of the tightening member is strengthened to restrict the rotation of the shaft in the second direction.

The pressing apparatus according to the present invention is disposed around a fixed plate fixed in position, a die fixed to the fixed plate, and a periphery of the die, and is provided movably away from the fixed plate and close to the fixed plate A first mold including a movable member movably provided, and a movable plate opposite to the fixed plate with respect to the first mold and movably provided in proximity to the first mold A second mold is provided movably away from the first mold, and cooperates with the first mold to process the work by sandwiching the work to which the lubricating oil is applied.

Furthermore, the press processing apparatus moves the second mold close to the first mold, moves the second mold away from the first mold, and vibrates the second mold. And a die cushion device for supporting the movable member.

The die cushion device urges the movable member toward the second mold, and the movable member cooperates with the second mold when a pressing force greater than a predetermined value is applied to the movable member from the second mold. It includes an urging device for moving the movable member so as to be close to the fixed plate while maintaining the holding state of the workpiece, and a regulating device for restricting the displacement of the movable member away from the fixed plate.

Preferably, the regulating device includes a stroke bar integrally moving with the movable member, and a shaft portion regulating device selectively regulating movement of the stroke bar. The stroke bar moves in a first direction when the movable member moves closer to the fixed plate, and moves in a second direction opposite to the first direction when the movable member moves away from the fixed plate. Do. The shaft regulation device locks the stroke bar to restrict the movement of the stroke bar in the second direction, and a lock that allows the stroke bar to move in the first direction, and a lock And a release mechanism capable of releasing the restriction on the movement direction of the stroke bar by the unit.

Preferably, a screw portion is formed on the circumferential surface of the stroke bar. The restriction device is screwed with the screw portion, rotates the stroke bar in the first rotation direction when the stroke bar moves in the first direction, and rotates the stroke bar in the second rotation direction when the stroke bar moves in the second direction Including a nut portion.

The shaft portion regulating device includes an inner ring mounted on the outer peripheral surface of the stroke bar, an outer ring disposed spaced from the inner ring, and a tightening member capable of tightening the outer ring. The release mechanism includes an adjustment mechanism capable of adjusting the tightening force of the outer ring by the tightening member. The locking portion is disposed between the inner ring and the outer ring, and the locking portion allows the stroke bar to rotate in the second rotation direction by the tightening mechanism of the tightening member being weakened by the adjusting mechanism. The tightening force of the tightening member is strengthened, thereby restricting the rotation of the stroke bar in the second rotation direction.

Preferably, the biasing device includes a stroke bar moving integrally with the movable member, and the stroke bar moves in the first direction when the movable member moves closer to the fixed plate, and the movable member is fixed plate When it is displaced away from the first direction, it is displaced in a second direction opposite to the first direction.

The restriction device has an outer peripheral surface formed in a curved surface shape, is rotatably provided about a rotation center line, and rotates in an allowable rotation direction when the stroke bar is displaced in the first direction. Including.

The outer peripheral surface of the cam block has a contact portion in contact with the stroke bar, a first curved portion formed such that a distance from the rotation center line decreases with distance from the contact portion, and a first contact portion And a second curved portion located opposite to the curved portion and formed to increase in distance from the rotation center line as the distance from the contact portion increases. The second curved portion is located forward of the contact portion in the allowable rotation direction.

Preferably, the apparatus further comprises a posture maintaining device that biases the cam block so that the contact between the contact portion of the cam block and the stroke bar is maintained.

Preferably, the apparatus further comprises a release device for rotating the cam block to separate the outer peripheral surface of the cam block from the stroke bar so that the first curved portion of the cam block is closest to the stroke bar.

According to the pressing device of the present invention, the occurrence of burn-in and the like can be suppressed. According to the shaft portion restricting device according to the present invention, the movement of the shaft portion can be selectively restricted.

It is sectional drawing of the press processing apparatus which shows the state before processing a workpiece | work. It is sectional drawing of the press processing apparatus which shows the state at the time of an upper metal mold | die and a lower metal mold | die clamping a workpiece | work, and processing a workpiece | work. It is sectional drawing in a drive device and a vibration apparatus. It is a graph which shows the vibration state of an upper mold. It is a sectional view of a die cushion device. It is sectional drawing which shows the detail of a control apparatus. It is sectional drawing which looked at a part of upper die and lower die in process of processing of a workpiece | work. FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. It is a front view of the control apparatus which shows the state when the control by a control apparatus was cancelled | released. It is sectional drawing of the press processing apparatus which concerns on this Embodiment 2. FIG. It is sectional drawing of the die-cushion apparatus of the press processing apparatus which concerns on this Embodiment 2. FIG. It is a sectional view of a regulation device. FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 12 and a cross-sectional view of a one-way clutch. It is a sectional view of a one way clutch. It is sectional drawing of the engaging part and the part located in the circumference | surroundings. It is a sectional view of a die cushion device when processing of a work is completed.

The press processing apparatus according to the present invention will be described using FIGS. 1 to 16. In the embodiments described below, when the number, the amount, and the like are mentioned, the scope of the present invention is not necessarily limited to the number, the amount, and the like unless otherwise specified. Furthermore, in the following embodiments, each component is not necessarily essential to the present invention, unless otherwise specified. Further, in the case where there are a plurality of embodiments below, it is originally planned from the beginning to appropriately combine the feature portions of the respective embodiments, unless otherwise specified.

Embodiment 1
FIG. 1 is a cross-sectional view of a pressing apparatus 100 according to Embodiment 1 of the present invention. In addition, this FIG. 1 is sectional drawing of the press processing apparatus 100 which shows the state before processing the workpiece | work W. As shown in FIG. As shown in FIG. 1, the pressing apparatus 100 is provided on the opposite side to the bolster 20 with respect to the lower mold (first mold) 31 provided on the bolster 20 and the lower mold 31. A mold (second mold) 30 is provided.

The lower die holder 21 is fixed to the upper surface of the bolster 20, and the lower die 31 is fixed to the lower die holder 21. The lower mold holder 21 and the bolster 20 are fixed plates whose positions are fixed. The lower mold 31 includes a die 32 fixed to the bolster 20 via the lower mold holder 21 and an annular blank holder (movable member) 33 disposed around the die 32.

The blank holder 33 is disposed at a distance from the upper surface of the lower mold holder 21, and the blank holder 33 is provided movably in proximity to the upper surface of the lower mold holder 21 and of the lower mold holder 21. It is provided so as to be movable away from the top surface. A work W to which lubricating oil is applied is disposed on the upper surface of the lower mold 31.

The upper mold 30 is located opposite to the bolster 20 with respect to the lower mold 31 and provided movably in proximity to the lower mold 31 and provided movably away from the lower mold 31. It is done. The work W can be processed by the upper mold 30 and the lower mold 31 cooperating to sandwich the work W.

The press processing apparatus 100 moves the upper mold 30 toward the lower mold 31 so as to approach or move away from the lower mold 31, and the stroke direction of the upper mold 30. And a die cushion device 70.

The upper mold 30 includes an annularly formed die 34 and an extrusion member 35 disposed in the die 34, and the die 34 is fixed to the lower surface of the upper mold holder 22. The pushing member 35 is disposed in the die 34 and is provided to be movable in the vertical direction.

A ram slide 6 is fixed to the upper surface of the upper mold holder 22, and a driving device 50 is provided on the upper surface of the ram slide 6.

The driving device 50 includes a motor 12, a crankshaft connected to an output shaft of the motor 12 and rotated by a driving force of the motor 12, and a connection rod 2 rotatably connected to the crankshaft. A vibration device 60 is disposed between the connection rod 2 and the ram slide 6. The vibrating device 60 is fixed to the ram slide 6, and the driving force from the drive device 50 is transmitted to the ram slide 6 via the vibrating device 60.

The crankshaft includes a shaft body 13 rotatably provided about a rotation center line O, and a shaft 11 fixed to the shaft body 13 at a position away from the rotation center line O. The shaft portion 11 rotates so that the shaft portion 11 revolves around the rotation center line O when the shaft main body 13 rotates around the rotation center line O. The connection rod 2 is rotatably connected to the shaft 11, and when the shaft body 13 rotates, the shaft 11 rotates and the lower end of the connection rod 2 is displaced in the vertical direction. The ram slide 6, the upper mold holder 22 and the upper mold 30 are displaced in the vertical direction, and the upper mold 30 approaches the lower mold 31 or the upper mold 30 separates from the lower mold 31.

A rod 23 is fixed to the upper surface of the bolster 20, and the rod 23 is provided to project upward through a through hole formed in the lower die holder 21.

A cylindrical cylindrical portion 24 provided so as to project downward is fixed to the ram slide 6, and the rod 23 can be inserted into the cylindrical portion 24. For this reason, the ram slide 6 and the like are guided by the rod 23 and the cylindrical portion 24 and stroked in a predetermined direction.

The die 34 is disposed above the blank holder 33, and the pushing member 35 is positioned above the die 32.

FIG. 2 is a cross-sectional view of the pressing apparatus 100 showing a state in which the upper mold 30 and the lower mold 31 sandwich the work W and process the work W. As shown in FIG.

As shown in FIG. 2, when the upper mold 30 approaches the lower mold 31, the work W disposed on the upper surface of the lower mold 31 is clamped by the blank holder 33 and the die 34.

The die cushion device 70 includes a hydraulic cylinder (biasing device) 71 and a regulating device 75. The hydraulic cylinder 71 includes a cylinder portion 73 formed in a cylindrical shape, and a piston 72 disposed in the cylinder portion 73 and sliding in the cylinder portion 73. The biasing device is not limited to the hydraulic cylinder, and various devices such as an air cylinder and an elastic member can be employed.

The die cushion device 70 includes a base portion 76 fixed to the upper surface of the piston 72 and a cushion pin 77 fixed to the upper surface of the base portion 76. A blank holder 33 is fixed to the upper end of the cushion pin 77. The cushion pin 77 is connected to the blank holder 33 through a through hole 20 a formed in the bolster 20 and a through hole 21 a formed in the lower die holder 21. The hydraulic cylinder 71 biases the blank holder 33 toward the upper die 30.

The hydraulic cylinder 71 starts to be lowered downward when the load applied to the blank holder 33 from the die 34 becomes equal to or greater than a predetermined value. At this time, the state in which the upper surface of the blank holder 33 and the lower surface of the die 34 sandwich the work W is maintained.

The die 32 is fixed to the upper surface of the lower mold holder 21 while the blank holder 33 is lowered and the blank holder 33 is displaced so as to approach the upper surfaces of the bolster 20 and the lower mold holder 21. The workpiece W is deformed by displacing the upper surface of the blank holder 33 in the direction from the upper surface side of the die 32 to the upper surface side of the lower mold holder 21 and the bolster 20.

Specifically, the peripheral portion of the workpiece W held by the blank holder 33 and the die 34 is deformed so as to be closer to the bolster 20 than the central portion of the workpiece W. For this reason, the central portion of the work W protrudes upward beyond the peripheral portion of the work W.

FIG. 3 is a cross-sectional view of the drive device 50 and the vibration device 60. As shown in FIG. The drive device 50 shown in FIG. 3 is a cross-sectional view of the drive device 50 in a state in which the upper mold 30 is separated from the lower mold 31.

As shown in FIG. 3, a through hole 2 a 1 is formed in the upper end portion of the connection rod 2, and a shaft 11 is inserted into the through hole 2 a 1. A through hole 2 a 2 is formed at the lower end of the connection rod 2.

The vibration device 60 includes a vibration drive motor 5, a cam shaft 10 connected to an output shaft 15 of the vibration drive motor 5, and a cam follower 7.

The cam shaft 10 is rotated about the rotation center line O1 by the driving force applied from the output shaft 15. The camshaft 10 is inserted into the through hole 2 a 2 of the connection rod 2 and rotatably supported by the bearing 3 and the bearing 4. The bearing 3 and the bearing 4 are arranged at an interval, and the bearing 3 and the bearing 4 are fitted in the inner circumferential surface of the through hole 2 a 2 of the connection rod 2.

The circumferential surface of the cam shaft 10 includes a cam portion 10a and shaft portions 10b located on both sides of the cam portion 10a, and the circumferential surface of the shaft portion 10b is formed in a cylindrical surface centered on the rotation center line O1. The circumferential surface of the cam portion 10a is formed in a cylindrical shape centered on the rotation center line O2.

The rotation center line O2 is slightly deviated from the rotation center line O1, and the distance between the rotation center line O1 and the rotation center line O2 is a distance L1.

Here, the connection between the output shaft 15 and the cam shaft 10 is located on the rotation center line O1. For this reason, the circumferential surface of the cam portion 10a rotates around the rotation center line O1. On the other hand, the cam portion 10a revolves around the rotation center line O1.

The bearing 3 and the bearing 4 are fitted in the inner peripheral surface of the through hole 2 a 2 of the connection rod 2. One shaft portion 10 b of the camshaft 10 is fixed to the inner race of the bearing 3, and the other shaft portion 10 b is fixed to the inner race of the bearing 4. The cam portion 10 a is located between the bearing 3 and the bearing 4.

The cam follower member 7 is formed in a flat plate shape, and includes a fixing portion 17 fixed to the ram slide 6 shown in FIG. 1 and a projection 16 formed on the upper surface of the fixing portion 17 and projecting upward. . A through hole 7 a is formed in the projection 16, and the cam portion 10 a of the cam shaft 10 is inserted into the through hole 7 a.

When the vibration drive motor 5 is driven and the output shaft 15 rotates, the cam shaft 10 also rotates. Then, when the cam portion 10a rotates around the rotation center line O1, the cam follower 7 mounted on the cam portion 10a also vibrates in synchronization with the revolving motion of the cam portion 10a.

As the cam follower 7 vibrates, the ram slide 6, the upper mold holder 22 and the upper die 30 shown in FIG. 2 also vibrate.

FIG. 4 is a graph showing the vibration state of the upper die 30, and the horizontal axis of the graph shown in FIG. 4 shows the rotation angle (θ) of the shaft body 13. The vertical axis indicates the position in the height direction of the upper mold 30 with reference to the bottom dead center of the upper mold 30.

As shown in FIG. 4, it can be seen that the upper die 30 repeats micro-vibration while the shaft body 13 makes one rotation.

The rotational speed (rotations / min) at which the vibration drive motor 5 rotates the camshaft 10 is several to several tens times higher than the rotational speed (rotations / min) at which the crankshaft is rotated. Thereby, the upper mold 30 can be minutely vibrated a plurality of times until the upper mold 30 makes one stroke. The amplitude of the minute vibration of the upper die 30 is set by the rotation radius L1 of the cam portion 10a (the distance between the rotation axis O1 of the output shaft 15 and the central axis O2 of the cam portion 10a). And the rotation radius L1 of the cam portion 10a is much smaller than the rotation radius L2 of the shaft portion 11 (the distance between the center line O3 of the shaft portion 11 and the rotation axis O of the crankshaft).

FIG. 5 is a cross-sectional view of the die cushion device 70. As shown in FIG. As shown in FIG. 5, the die cushion device 70 includes a plurality of stroke bars 78 fixed to the lower surface of the base portion 76. The stroke bar 78 extends downward from the lower surface of the base portion 76.

The stroke bar 78 is fixed to the blank holder 33 via the base portion 76 and the cushion pin 77. Therefore, for example, when the blank holder 33 is displaced close to the bolster 20, it is displaced in the first direction (downward) D1, and when the blank holder 33 is displaced away from the bolster 20, the stroke bar 78 is moved in the second direction. (Upper) Displaces to D2. A plurality of regulating devices 75 are disposed around the stroke bar 78.

FIG. 6 is a cross-sectional view showing details of the regulating device 75. As shown in FIG. As shown in FIG. 6, the restricting device 75 holds the cam block 90, the central axis 91 rotatably supporting the cam block 90 about the rotation center line O3, and the attitude of the cam block 90 at a predetermined position. And an unlocking device. FIG. 6 shows a state in which the cam block 90 of the regulating device 75 regulates the displacement of the stroke bar 78 in the second direction (upward) D2.

The cam block 90 is formed in a flat plate shape, and the circumferential surface of the cam block 90 is curved. As shown in FIG. 6, in a state where the cam block 90 regulates the movement of the stroke bar 78 in the first direction D1, the contact point P1 of the peripheral surface of the cam block 90 and the peripheral surface of the stroke bar 78 And are in contact.

The circumferential surface of the cam block 90 has a contact point P1, a curved surface 81 formed such that the distance from the rotation center line O3 becomes shorter as the distance from the contact point P1 increases, and the curved surface 81 with respect to the contact point P1. And a curved surface 82 formed on the opposite side and formed such that the distance from rotation center line O3 increases with distance from contact point P1.

A lock wall 92 is disposed opposite to the stroke bar 78 with respect to the cam block 90. The contact point P2 of the cam block 90 is in contact with the surface of the lock wall 92. The surface of the lock wall 92 is flat.

The contact point P1 and the contact point P2 are arranged on an imaginary straight line passing through the rotation center line O3. The curved surface 83 is located on the front side in the allowable rotation direction R1 with respect to the contact point P2, and the curved surface 85 is formed on the rear side in the allowable rotation direction R1 with respect to the contact point P2. ing.

The distance between the curved surface 83 and the rotation center line O3 is longer than the distance between the contact point P2 and the rotation center line O3, and the distance between the curved surface 83 and the rotation center line O3 is It is formed to be longer as it gets away from the contact point P2.

The distance between the curved surface 85 and the rotation center line O3 is shorter than the distance between the contact point P2 and the rotation center line O3, and the curved surface 85 and the rotation center line O3 move away from the contact point P2. The distance between and becomes short.

Here, the curved surface 82 extends from the contact point P1 to the boundary point P3 in FIG. 6, and the curved surface 83 extends from the contact point P2 to the boundary point P4. There is. The boundary point P3 and the boundary point P4 are arranged on an imaginary straight line passing through the rotation center line O.

An intersection angle θ1 of an imaginary straight line passing through the boundary point P3 and the boundary point P4 and an imaginary straight line passing through the contact point P1 and the contact point P2 is set to, for example, about 5 degrees.

Here, when the stroke bar 78 tries to displace in the first direction (downward) D1, the cam block 90 tries to rotate in the allowable rotation direction R1. Here, the curved surface 81 is located on the rear side in the allowable rotation direction R1 from the contact point P1.

Since the length between the curved surface 81 and the rotation center line O3 is shorter than the distance between the contact point P1 and the rotation center line O, the cam block 90 can rotate in the allowable rotation direction R1. it can. When the contact point P1 is in contact with the circumferential surface of the stroke bar 78, the contact point P2 is in contact with the lock wall 92. Since the curved surface 85 is positioned on the rear side in the rotational direction of the allowable rotation direction R1 with respect to the contact point P2, the cam block 90 is allowed to rotate in the allowable rotational direction R1.

For this reason, when the cam block 90 slightly rotates in the allowable rotation direction R1, almost no surface pressure between the cam block 90 and the stroke bar 78 is generated, so that the stroke bar 78 is favorably in the first direction (downward ) Displace toward D1.

On the other hand, when the stroke bar 78 tries to be displaced in the second direction (upward) D2, the cam block 90 tries to rotate in the direction opposite to the allowable rotation direction R1.

The curved surface 82 is located forward of the contact point P1 in the allowable rotation direction R1. Therefore, when the stroke bar 78 tries to move in the second direction (upward) D2 with the contact point P1 of the cam block 90 and the circumferential surface of the stroke bar 78 in contact, the curved surface 82 has a stroke Support the bar 78.

Similarly, since the curved surface 83 is located forward of the contact point P2 in the allowable rotation direction R1, the stroke bar 78 is in the second direction (upper) D2 with the contact point P2 in contact with the lock wall 92. The curved surface 83 supports the lock wall 92 as it moves.

Thereby, the surface pressure at the contact point P1 and the contact point P2 becomes high. As a result, even if the stroke bar 78 tries to move upward, the cam block 90 regulates the displacement of the stroke bar 78.

The restricting device 75 includes a posture maintaining device 99 which tries to maintain the posture of the cam block 90 so that the cam block 90 returns to a predetermined posture.

The posture holding device 99 includes a pressing pin 97, a spring (biasing member) 98 for biasing the pressing pin 97, and an unlocking pin 96 disposed on the opposite side of the pressing pin 97 with respect to the cam block 90. .

Here, the pressing pin 97 presses a portion of the circumferential surface of the cam block 90 located closer to the lock wall 92 than the rotation center line O3, and the cam block 90 is directed in the direction opposite to the allowable rotation direction R1. The cam block 90 is pressed to rotate the cam block 90.

On the other hand, the lock release pin 96 is fixed at a fixed position during processing of the work W, and functions as a stopper that restricts the cam block 90 from rotating in the direction opposite to the allowable rotation direction R1. . When the cam block 90 and the lock release pin 96 are in contact, the attitude of the cam block 90 is such that the contact point P1 of the cam block 90 contacts the stroke bar 78 and the contact point P2 contacts the lock wall 92 It is a posture.

Here, when the stroke bar 78 is displaced in the first direction (downward) D1 from the state shown in FIG. 6, the cam block 90 pushes the pressing pin 97 upward. Then, when the rotational force of the cam block 90 decreases, the cam block 90 rotates in the direction opposite to the allowable rotation direction R1 by the pressing force from the pressing pin 97. Then, the cam block 90 and the lock release pin 96 abut against each other, and the attitude of the cam block 90 becomes the original attitude.

On the other hand, even if the cam block 90 tries to rotate in the direction opposite to the allowable rotation direction R1, the unlocking pin 96 supports the cam block 90, and the rotation of the cam block 90 is restricted.

As shown in FIG. 1 and FIG. 2, the support portion 43 is disposed at the lower end portion of the lock release pin 96, and the position of the upper end portion of the lock release pin 96 is positioned.

FIG. 7 is a cross-sectional view enlarging a part of the upper mold 30 and the lower mold 31 during processing of the work W. As shown in FIG.

In FIG. 4 described above, the die 34 processes the workpiece W while making minute vibrations. And in this FIG. 7, it is a cross-sectional view when the die 34 is slightly raised. As shown in FIG. 7, in the process of drawing and forming the work W, the oil is pushed out to the peripheral portion of the work W and is accumulated in the peripheral portion of the work W.

On the other hand, oil is insufficient between the circumferential surface of the die 34 and the surface of the workpiece W, between the upper surface of the blank holder 33 and the workpiece W, and between the surface of the die 32 and the surface of the workpiece W easy.

Therefore, slight displacement occurs between the lower surface of the die 34 and the surface of the work W by minute vibration while the die 34 is displaced downward, and the oil accumulated on the peripheral portion of the work W is It is possible to suppress the occurrence of penetration and burning.

Furthermore, when the die 34 ascends, the workpiece W may ascend with the die 34 in a state in which the work W is stuck to the die 34. In this case, the oil reaches the upper surface of the blank holder 33 and the peripheral surface of the die 32. Thus, oil can be prevented from entering the space between the blank holder 33 and the die 32 and the work W, and the work W can be seized.

The blank holder 33 is always pressed upward from the hydraulic cylinder 71 shown in FIG. The die 34 vibrates so that timing at which the pressing force applied from the die 34 to the blank holder 33 disappears occurs.

At this time, since the cam block 90 shown in FIG. 6 regulates the elevation of the stroke bar 78, the blank holder 33 is prevented from rising even if the die 34 minutely vibrates and ascends. .

As described above, when the pressing force applied from the die 34 is larger than the biasing force applied from the hydraulic cylinder 71 during the drawing, the blank holder 33 is displaced downward, and the pressing force applied from the die 34 is the hydraulic pressure. If it is smaller than the biasing force applied from the cylinder 71, it stops without raising or lowering.

Therefore, micro vibration of the die 34 causes between the lower surface of the die 34 and the surface of the workpiece W, between the upper surface of the blank holder 33 and the workpiece W, and between the upper surface of the die 32 and the surface of the workpiece W Can create a gap, and oil can be introduced into each gap.

A slight gap may occur in part between the surface of the work W and the side surface of the die 32 or the die 34 during the draw forming process.

When such a gap is generated, the oil which has entered between the lower surface of the die 34 and the upper surface of the work W and the oil which has entered between the upper surface of the blank holder 33 and the lower surface of the work W are capillary work. It gets in between the surface of W and the side of die 32 or die 34. This can further suppress the occurrence of adverse effects such as burn-in.

FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG.

As shown in FIG. 8, the unlocking device 40 includes a hydraulic cylinder 41 and a slider 42 that moves by the driving force from the hydraulic cylinder 41.

Two hydraulic cylinders 41 are provided at intervals, and a slider 42 is provided to each hydraulic cylinder 41.

The slider 42 is divided into two support portions 43 at a tip end opposite to the root portion on the hydraulic cylinder 41 side. The support portion 43 is disposed to support the lower end portion of the lock release pin 96 as shown in FIGS. 1 and 2. The support portion 43 is formed to be thicker as it goes from the tip end side to the root side.

Therefore, when the support portion 43 is pushed forward by the driving force from the hydraulic cylinder 41, the unlocking pin 96 shown in FIGS. 1 and 2 is moved upward.

Here, as shown in FIG. 2, when the processing of the work W is completed, the molded article is pushed out by displacing the blank holder 33 upward. Therefore, it is necessary to release the restriction by the restriction device 75.

FIG. 9 is a partial cross-sectional view of the regulating device 75 showing a state when the regulation by the regulating device 75 is released. Here, when the processing of the workpiece W is completed, the stroke bar 78 is slightly displaced in the first direction (downward) D1. Thereby, the cam block 90 slightly rotates in the allowable rotation direction R1. The lock release device 40 shown in FIG. 8 pushes the slider 42 in accordance with the rotation of the cam block 90. As a result, as shown in FIG. 9, the lock release pin 96 is raised, and the cam block 90 is further rotated in the allowable rotation direction R1.

As the cam block 90 further rotates in the allowable rotation direction R1, the curved surface 81 of the cam block 90 approaches the stroke bar 78, and a gap is generated between the cam block 90 and the stroke bar 78.

As a result, the stroke bar 78 is able to rise by the pressing force from the piston 72 shown in FIGS. 1 and 2, and the blank holder 33 is displaced to the upper side.

Then, the molded product is pushed out by the blank holder 33.
Second Embodiment
The pressing apparatus 100 and the restriction device 75 according to the second embodiment of the present invention will be described using FIGS. 10 to 16. Among the configurations shown in FIGS. 10 to 16, the configurations that are the same as or correspond to the configurations shown in the above-described FIGS. 1 to 9 may be given the same reference numerals and the description thereof may be omitted.

FIG. 10 is a cross-sectional view of the pressing apparatus 100 according to the second embodiment. As shown in FIG. 10, the pressing apparatus 100 according to the second embodiment includes a bolster 20 and a lower die holder 21 functioning as a fixed plate, and a lower die (first die provided on the lower die holder 21). And 31) an upper mold (second mold) 30 provided on the opposite side of the lower mold holder 21 etc. to the fixed plate and a drive device 50 for moving the upper mold 30 And a die cushion device 70 for vibrating the upper mold 30 in the vertical direction.

The lower mold holder 21 and the bolster 20 are fixed to the apparatus main body, and the positions thereof are fixed. The lower mold 31 is disposed around the die 32 fixed to the lower mold holder 21 and around the die 32 so as to be movable away from the lower mold holder 21 and close to the lower mold holder 21. And a blank holder (movable member) 33 provided movably.

The upper mold 30 is movably provided so as to be close to the lower mold 31, and movably provided so as to be separated from the lower mold 31. Then, the upper mold 30 cooperates with the lower mold 31 to sandwich the work W and process the work W.

FIG. 11 is a cross-sectional view of the die cushion device 70 of the pressing device 100 according to the second embodiment. In FIGS. 10 and 11, the die cushion device 70 selectively displaces the hydraulic cylinder 71 for urging the blank holder 33 toward the upper mold 30 and the blank holder 33 to be separated from the lower mold holder 21. And a regulating device 75 for regulating the

When a pressing force greater than a predetermined pressure is applied to the blank holder 33 from the upper mold 30, the hydraulic cylinder 71 moves the blank holder 33 so as to be close to the lower die holder 21. At this time, a biasing force is applied to the blank holder 33 from the hydraulic cylinder 71 upward. For this reason, the work W is maintained in the state of being sandwiched by the blank holder 33 and the upper die 30. Furthermore, when the blank holder 33 is displaced toward the lower mold holder 21, the processing of the work W proceeds because the position of the die 32 is fixed.

The hydraulic cylinder 71 includes a cylindrical cylinder portion 73, a piston 72 provided in the cylinder portion 73 and movable in the vertical direction, and a base portion 76 fixed to an upper end portion of the piston 72. A cushion pin 77 connecting the base portion 76 and the blank holder 33 is included.

When the piston 72 ascends, the base portion 76 and the cushion pin 77 ascend to displace the blank holder 33 so that the blank holder 33 is separated from the lower mold holder 21. When the piston 72 is lowered, the base portion 76 and the cushion pin 77 are lowered to bring the blank holder 33 close to the lower mold holder 21.

In FIG. 11, a plurality of regulating devices 75 are provided around the cylinder portion 73. The regulating device 75 includes a bearing unit 148 fixed to the base portion 76, a stroke bar (shaft portion) 78 connected to the bearing unit 148, a nut portion 133 fixed to the cylinder portion 73, and the stroke bar 78. It includes a one-way clutch (shaft portion regulating device) 134 provided at the lower end portion, and a cylinder portion 141.

The stroke bar 78 is rotatably provided to the bearing unit 148, while the stroke bar 78 is connected to the bearing unit 148 so as not to move in the axial direction of the stroke bar 78.

Therefore, the stroke bar 78 moves integrally with the base portion 76, the piston 72, the cushion pin 77 and the blank holder 33.

Then, when the blank holder 33 is displaced so as to approach the lower die holder 21, the stroke bar 78 is displaced in the first direction D1 (downward direction). The displacement of the blank holder 33 away from the lower mold holder 21 displaces the stroke bar 78 in the second direction D2 (upward direction).

The cylinder portion 141 connects the bearing unit 148 and the one-way clutch 134, and the bearing unit 148 and the one-way clutch 134 are integrated by the cylinder portion 141. The stroke bar 78 is arranged to connect the bearing unit 148 and the one-way clutch 134.

The nut portion 133 is disposed between the bearing unit 148 and the one-way clutch 134, and is fixed to the cylinder portion 73.

A slit is formed in the cylinder portion 141, and even if the cylinder portion 141 is displaced in the vertical direction, the cylinder portion 141 and the nut portion 133 do not interfere with each other.

Here, during the processing of the workpiece W, the die 34 shown in FIG. 10 vibrates in the vertical direction by the vibration device 60. The vibration speed of the die 34 is faster than the stroke speed by the drive device 50. For this reason, during processing of the work W, the die 34 periodically moves away from the surface of the work W while being displaced downward.

The piston 72 biases the base 76 and the blank holder 33 upward with a predetermined pressing force. For this reason, when the die 34 is slightly lifted, the blank holder 33 tends to be lifted by the pressing force from the piston 72.

At this time, in FIG. 11, the restricting device 75 restricts the displacement of the stroke bar 78 in the second direction D2. Therefore, even if the die 34 is lifted during processing, the blank holder 33 is also prevented from being lifted. As a result, a gap is generated between the surface of the die 34 or the blank holder 33 and the surface of the workpiece W, and the oil accumulated on the peripheral portion of the workpiece W enters the gap. As a result, it is possible to suppress that oil spreads over the surface of the workpiece W and a defect such as baking occurs on the workpiece W.

Even when the die 34 is in contact with the work W, the piston 72 applies a constant pressing force to the blank holder 33, and when a load exceeding the pressing force is applied to the blank holder 33, the piston 72 retreats downward.

When the piston 72 and the base 76 are displaced downward, the stroke bar 78 is displaced in the first direction D1. During processing of the workpiece W, the restricting device 75 allows the stroke bar 78 to be displaced in the first direction D1. For this reason, the blank holder 33 and the die 34 are displaced downward in a state in which the work W is sandwiched. Thereby, the processing of the work W proceeds.

FIG. 12 is a cross-sectional view of the regulating device 75. As shown in FIG. The cross section shown in FIG. 12 is a cross section at a position different from the cross section of the regulating device 75 shown in FIG. For this reason, in FIG. 12, the slits formed in the cylindrical portion 141 are not shown.

As shown in FIG. 12, the bearing unit 148 is fixed to the base portion 76 by bolts 130. The bearing unit 148 is fixed to the cylindrical portion 141 by a bolt 131. The one-way clutch 134 is fixed to the cylindrical portion 141 by a bolt 132.

Therefore, the base portion 76, the bearing unit 148, the cylinder portion 141, the one-way clutch 134, and the stroke bar 78 move integrally.

A screw portion 140 is formed on the outer peripheral surface of the stroke bar 78. The nut portion 133 is screwed with the screw portion 140. Since the nut portion 133 is fixed to the apparatus main body as described above, its position is fixed.

Then, when the base portion 76 is displaced downward and the stroke bar 78 is also displaced in the first direction D1, the nut portion 133 rotates the stroke bar 78 in the first rotation direction R11.

When the stroke bar 78 moves in the second direction D2, the nut portion 133 tries to rotate the stroke bar 78 in the second rotation direction R2.

The one-way clutch 134 allows the rotation of the stroke bar 78 in the first rotational direction R11, and restricts the rotation in the second rotational direction R2, and the stroke bar by the engagement portion 163. And 78 a release mechanism 157 capable of selectively releasing the restriction of rotation.

During processing of the work W, the engagement portion 163 regulates the stroke bar 78 from rotating in the second rotation direction R2, and the stroke bar 78 is regulated from moving in the second direction D2. . Thereby, it is suppressed that the blank holder 33 raises during processing.

One-way clutch 134 includes a clutch case 174 and a clutch body 161 provided in clutch case 174. The clutch case 174 is fixed to the cylindrical portion 141 by the bolt 132.

The clutch main body 161 includes an inner ring 160 fitted on the outer periphery of the stroke bar 78, an outer ring 162 arranged on the outer peripheral side of the inner ring 160, and a plurality of engaging portions 163 arranged between the inner ring 160 and the outer ring 162. It includes a tightening member 166 mounted on the outer periphery of the outer ring 162 and capable of applying a tightening force to the outer ring 162.

One of the outer ring 162 and the inner ring 160 is rotatably provided relative to the other by a bearing 136. The outer ring 162 is rotatably provided relative to the clutch case 174 by a bearing 135. The stroke bar 78 is inserted into the inner ring 160, and the stroke bar 78 is fixed.

The release mechanism 157 includes an adjusting mechanism 167 capable of adjusting the tightening force of the tightening member 166, and a drive mechanism 151 for driving the adjusting mechanism 167.

The drive mechanism 151 includes an air cylinder 153, a piston 152 driven by the air cylinder 153, and a switching lever 150 rotatably connected to the piston 152. The air cylinder 153 is provided rotatably about a fulcrum. The switching lever 150 is rotatably provided centering on a shaft portion 171 provided in the adjusting mechanism 167.

The drive mechanism 151 shown by a solid line drives the adjustment mechanism 167 so that the tightening force applied to the outer ring 162 by the tightening member 166 is increased. As a result, the rotation of the stroke bar 78 in the second rotational direction R2 is restricted by the engagement portion 163.

When the air cylinder 153 is driven to pull in the piston 152 from the state shown by the solid line, the switching lever 150 rotates around the shaft portion 171 as shown by the two-dot chain line in FIG.

Thus, when the switching lever 150 rotates, the tightening force applied to the outer ring 162 is weakened by the tightening member 166. When the tightening force applied to the outer ring 162 decreases, the restriction on the rotation of the stroke bar 78 by the engaging portion 163 is released.

FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 12, and is a cross-sectional view of the one-way clutch 134.

As shown in FIG. 13, a notch 172 is formed in the outer ring 162. The fastening member 166 is attached to the outer peripheral surface of the outer ring 162, and includes a fastening main body portion 168 in which the notch portion 173 is formed, and a flange portion 169 formed at each end of the fastening main body portion 168.

Each flange portion 169 is formed so as to radially project from the end of each tightening body portion 168, and is formed to face each other. A screw hole 170 is formed in the collar portion 169.

The adjusting mechanism 167 includes a shaft portion 171 formed with a screw portion corresponding to the screw hole 170 on the surface, and a switching lever 150 provided on the shaft portion 171. When the switching lever 150 rotates, the shaft 171 rotates. Depending on the direction of rotation of the shaft 171, the flanges 169 are moved closer to or separated from each other.

For example, by moving the flanges 169 so as to be close to each other, the tightening force applied to the outer ring 162 by the tightening body 168 increases, and the flanges 169 move away from each other. The tightening force that the portion 168 applies to the outer ring 162 is relaxed.

Then, when the tightening force to the outer ring 162 by the tightening main body portion 168 is increased, the notch portion 172 formed in the outer ring 162 is closed, and the diameter of the outer ring 162 is reduced. When the inner ring 160 and the stroke bar 78 rotate in the second rotational direction R2 with the notch 172 closed, the engaging portion 163 engages with the outer peripheral surface of the inner ring 160 and the inner peripheral surface of the outer ring 162. The inner ring 160 is fixed to the outer ring 162.

On the other hand, when the inner ring 160 rotates in the first rotation direction R11 with respect to the outer ring 162, the engagement portion 163 allows the inner ring 160 to rotate relative to the outer ring 162. Thus, in the state where the notch portion 172 is closed, the stroke bar 78 is allowed to rotate only in the first rotation direction R11.

On the other hand, as shown in FIG. 14, when the tightening force to the outer ring 162 by the tightening main body portion 168 decreases, the notch portion 172 formed in the outer ring 162 opens. When the notch 172 opens, the diameter of the outer ring 162 increases. When the diameter of the outer ring 162 increases, the engaging portion 163 does not abut on the outer ring 162 even if the inner ring 160 and the stroke bar 78 rotate in the second rotation direction R2. As a result, the inner race 160 and the shaft 132 can rotate in the second rotational direction R2.

The clutch main body 161 includes an elastic member 165 provided between the inner ring 160 and the outer ring 162 and holding the posture of the engagement portion 163, and a support portion 164 supporting the elastic member 165. The support portions 164 are circumferentially spaced apart, and the engagement portions 163 are arranged to be able to swing between the support portions 164.

FIG. 15 is a cross-sectional view of the engaging portion 163 and a portion located therearound. As shown in FIG. 15, the circumferential surface of engaging portion 163 includes a contact surface 175 in contact with the inner circumferential surface of outer ring 162 and a contact surface 176 in contact with the outer circumferential surface of inner ring 160. The engagement portion 163 is provided swingably by the movement of the outer ring 162 and the inner ring 160.

Then, when the inner ring 160 and the stroke bar 78 rotate in the first rotation direction R11, the engagement portion 163 rotates in the allowable rotation direction R3. At this time, the retraction surface 179 of the contact surface 176 contacts the outer circumferential surface of the inner ring 160, while the retraction surface 178 of the contact surface 175 faces the outer ring 162. The retraction surface 178 is formed to retract from the inner circumferential surface of the outer ring 162. Therefore, the inner ring 160 and the stroke bar 78 are allowed to rotate in the first rotation direction R11.

When the inner ring 160 rotates in the second rotation direction R2, the engagement portion 163 tends to rotate in the restriction rotation direction R4. At this time, the locking surface 177 of the contact surface 175 contacts the inner circumferential surface of the outer ring 162, and the locking surface 180 of the contact surface 176 contacts the outer circumferential surface of the inner ring 160.

Then, as the engaging portion 163 rotates in the restricting rotational direction R4, the distance between the contact position between the locking surface 177 and the inner circumferential surface of the outer ring 162 and the contact point between the locking surface 180 and the inner ring 160 The engaging portion 163 is formed so as to be large. Note that, as shown in FIG. 14, when the diameter of the outer ring 162 is enlarged, the engaging portion 163 can also rotate in the restricting rotational direction R4. Thus, the rotation direction of the stroke bar 78 is selectively defined by the one-way clutch 134.

FIG. 16 is a cross-sectional view of the die cushion device 70 when the processing of the work W is completed. When the processing of the workpiece W is completed, the air cylinder 153 shown in FIG. 12 is driven to rotate the shaft portion 171 of the adjustment mechanism 167. Thus, the restriction on the rotation of the stroke bar 78 by the one-way clutch 134 is released. After the restriction of the rotation of the stroke bar 78 is released, the piston 72 ascends to return the blank holder 33 to the initial position.

Although the embodiments of the present invention have been described above, it should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

The present invention can be applied to a press processing apparatus, and is particularly suitable for a press processing apparatus provided with a die cushion device.

Reference Signs List 1 crankshaft, 2 connection rod, 3 bearing, 4 bearing, 5 vibration drive motor, 6 ram slide, 7 cam follower, 7a through hole, 10 cam shaft, 10a cam portion, 10b shaft portion, 11 shaft portion, 12 Motor, 13 shaft body, 15 output shaft, 16 protrusion, 17 fixed part, 20 bolster, 20a through hole, 21 lower mold holder, 21a through hole, 22 upper mold holder, 23 cushion rod, 24 cylinder part, 30 upper metal Mold, 31 lower mold, 32 punches, 33 blank holders, 34 dies, 35 extrusion members, 40 unlocking devices, 41 hydraulic cylinders, 42 sliders, 43 supports, 50 drive devices, 60 vibration devices, 70 die cushion devices, 71 hydraulic cylinder, 72 piston, 73 cylinder section, 75 regulating device, 76 base section, 77 cushion 81, 82, 83, 85 curved surface, 90 cam block, 91 central axis, 92 lock wall, 96 lock release pin, 97 pressing pin, 99 attitude holding device, 100 pressing device, 133 nut portion, 134 one direction Clutch, 135 bearing, 136 bearing, 140 screw portion, 141 tube portion, 148 bearing unit, 150 switching lever, 151 drive mechanism, 152 piston, 153 air cylinder, 157 release mechanism, 160 inner ring, 161 clutch body, 162 outer ring, 163 Engaging portion, 164 supporting portion, 165 elastic member, 166 tightening member, 167 adjusting mechanism, 168 tightening main body portion, 169 flange portion, 170 screw hole, 171 shaft portion, 172 notch portion, 173 notch portion, 174 clutch case , 175 contact surface, 176 contact surface, 177 locking surface, 178 retraction surface, 179 retraction Avoidance surface, 180 locking surface, W work.

Claims

A locking portion (not shown) which allows the movably provided shaft (78) to move in the first direction and restricts the movement of the shaft in the second direction opposite to the first direction. 163),
A shaft regulation device, comprising: a release mechanism (157) capable of releasing regulation of the movement direction of the shaft by the locking portion.
It further comprises an inner ring (160) mounted on the outer peripheral surface of the shaft portion, an outer ring (162) spaced from the inner ring, and a tightening member (166) capable of tightening the outer ring.
The shaft is rotatably provided,
The release mechanism includes an adjustment mechanism (167) capable of adjusting the tightening force of the outer ring by the tightening member,
The locking portion is disposed between the inner ring and the outer ring.
The locking portion allows the shaft portion to rotate in the first direction by the tightening mechanism of the tightening member being weakened by the adjusting mechanism, and the tightening force of the tightening member is strengthened. The shaft portion regulating device according to claim 1, wherein rotation of the shaft portion in the second direction is restricted by being driven.
A fixed plate (20, 21) fixed in position,
A die (32) fixed to the fixed plate, and a movable member disposed around the die and movably provided away from the fixed plate and movably provided close to the fixed plate A first mold (31) including (33);
It is provided opposite to the fixed plate with respect to the first mold, movably provided to be close to the first mold, and movably provided to be separated from the first mold, A second mold (30) for processing the work by sandwiching the work (W) to which the lubricating oil is applied in cooperation with the first mold;
A driving device (50) for moving the second mold close to the first mold or moving the second mold away from the first mold;
A vibration device (60) for vibrating the second mold;
A die cushion device (70) for supporting the movable member;
Equipped with
The die cushion device urges the movable member toward the second mold, and the pressing force applied from the second mold to the movable member causes the movable member to move to the second mold. An urging device (71) for moving the movable member so as to be close to the fixed plate while maintaining the holding state of the work in cooperation with the mold, and the movable member in a direction away from the fixed plate A pressing apparatus comprising a regulating device (75) for regulating displacement.
The restricting device includes a stroke bar (78) integrally moving with the movable member, and a shaft portion restricting device selectively restricting the movement of the stroke bar.
The stroke bar moves in a first direction when the movable member moves so as to approach the fixed plate, and when the movable member moves away from the fixed plate, the second movement in a direction opposite to the first direction Displacing in the direction,
The shaft portion restricting device locks the stroke bar to restrict the movement of the stroke bar in the second direction and allows the stroke bar to move in the first direction. The press working apparatus according to claim 3, further comprising: a part (90, 163); and a release mechanism (40, 157) capable of releasing restriction of the movement direction of the stroke bar by the locking part.
A screw portion (140) is formed on the circumferential surface of the stroke bar;
The restriction device is screwed with the screw portion, and when the stroke bar moves in the first direction, the stroke bar is rotated in a first rotation direction, and when the stroke bar moves in the second direction, the stroke bar And a nut portion (133) for rotating the second rotation direction,
The shaft regulation device
An inner ring mounted on an outer peripheral surface of the stroke bar, an outer ring spaced from the inner ring, and a tightening member (166) capable of tightening the outer ring;
The release mechanism (157) includes an adjustment mechanism (167) capable of adjusting the tightening force of the outer ring by the tightening member,
The locking portion is disposed between the inner ring (160) and the outer ring (162),
The locking portion allows the stroke bar to rotate in the second rotation direction by the tightening mechanism of the tightening member being weakened by the adjustment mechanism, and the tightening force of the tightening member is The pressing apparatus according to claim 4, wherein the stroke bar is restricted from rotating in the second rotation direction by being strengthened.
The biasing device includes a stroke bar that moves integrally with the movable member, and the stroke bar moves in a first direction when the movable member moves closer to the fixed plate, and the movable member moves. When being displaced away from the fixed plate, it is displaced in a second direction opposite to the first direction,
The restriction device
An outer peripheral surface is formed in a curved surface and is provided rotatably around a rotation center line (O3), and the cam block rotates in an allowable rotation direction when the stroke bar is displaced in the first direction. Including (90),
An outer peripheral surface of the cam block is a contact portion (P1) in contact with the stroke bar, and a first curved portion (81) formed so that the distance from the rotation center line decreases with distance from the contact portion. And a second curved portion (82) positioned on the opposite side to the first curved portion with respect to the contact portion, and formed so that the distance from the rotation center line increases with distance from the contact portion. Including
The press working apparatus according to claim 3, wherein the second curved portion is located forward of the contact portion in the allowable rotation direction.
The press according to claim 6, further comprising a posture holding device (99) for biasing the cam block such that the contact portion of the cam block and the stroke bar are kept in contact with each other. Processing equipment.
The cam block is rotated so that the first curved portion of the cam block is closest to the stroke bar, and the apparatus further comprises a release device (40) for separating the outer peripheral surface of the cam block from the stroke bar. The press working apparatus according to claim 6.