JPH0639589A - Ram elevating device in press - Google Patents

Abstract

PURPOSE:To provide a ram elevating device which can elevate and lower the ram without using a hydraulic cylinder. CONSTITUTION:A casing 5 guiding freely vertically a ram 3 under a state of being unable to rotate is provided, a drive shaft 23 extending vertically is equipped in freely vertically movable and freely rotatable in this casing 5 and a control motor 35 provided with a rotator 39 which can be rotated reciprocally is provided to rotate this drive shaft 23 within a range of a prescribed angle in the forward and backward directions. The rotator 39 is connected to the drive shaft 23 and a 1st link 41 one end 41a of which is connected to the drive shaft 23 is provided obliquely in order that the drive shaft 23 is moved vertically linking with the rotation. The other end 41b of this 1st oblique link 41 is connected to the casing 5 and a 2nd link 43 which connects one end 43a thereof to the ram 3 is equipped obliquely. The other end 43b of this 2nd link 43 is connected to the drive shaft 23 and the casing 5 is mounted detachably on a body frame 7 of the press.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ram elevating and lowering device for elevating and lowering a ram in a press machine such as a punch press and a bending machine.

[0002]

2. Description of the Related Art Conventionally, in a press machine, an elevating and lowering device for elevating and lowering a ram will be described. A frame of the press machine is provided with a guide member for vertically elevating the ram, and the frame is moved up and down. A plurality of hydraulic cylinders are provided for this purpose.

Further, instead of using a hydraulic cylinder to move up and down the ram, a crank shaft having an eccentric portion is rotatably provided on the frame, and the eccentric portion is connected to the upper end of the ram. Here, the crankshaft can be connected and disconnected via a clutch device to a flywheel that can be rotationally driven via a drive motor.

[0004]

However, in the conventional ram elevating / lowering device as described above, since the hydraulic cylinder is used to elevate and lower the ram, a hydraulic device such as a hydraulic pump or a hydraulic tank is required. However, there is a problem that the structure of the ram lifting / lowering device becomes complicated and the cost of the ram lifting / lowering device becomes high. Further, even when the ram is moved up and down by using the crankshaft, the clutch device normally uses a hydraulic cylinder, and therefore, there is the same problem as described above.

[0005]

In order to solve the above-mentioned conventional problems, as a first means of the present invention, in a press machine, a ram can be raised and lowered freely in a non-rotatable state. A casing for guiding is provided, and a vertically extending drive shaft is provided in the casing so as to be movable up and down and rotatable. In order to rotate the drive shaft in a forward direction and a reverse direction within a range of a predetermined angle, forward and reverse rotation is possible. A control motor having a rotor is provided, the rotor is connected to the drive shaft, and the first link whose one end is connected to the drive shaft is tilted in order to move the drive shaft up and down in association with rotation. And the other end of the first inclined link is connected to the casing and the other end is connected to the ram.
The link is provided so as to be inclined, and the other end of the second link is connected to the drive shaft.

As a second means, in addition to the above structural requirements, the casing is detachably provided on the main frame of the press machine.

[0007]

In the above structure, the control shaft is appropriately operated to rotate the rotor from the origin position in the forward direction (or the reverse direction) by a predetermined angle, whereby the drive shaft is also rotated integrally with the rotor. As a result, the one end of the first link also rotates with respect to the other end by a predetermined angle, and the one end of the first link rises from the original height position by an amount corresponding to the predetermined angle. Further, the other end of the second link also rotates by a predetermined angle with respect to the one end, and the one end of the second link rises from the original height position by an amount corresponding to the predetermined angle. Therefore, by rotating the rotor of the control motor from the original position in the forward direction (or in the reverse direction) by a predetermined angle, the drive shaft moves from the original height position to the amount of increase of one end of the first link and the end of the second link. Therefore, the ram also rises by the amount corresponding to the sum of the amounts of rises, and the ram also rises from the original height position by the amount corresponding to the above to reach the raised height position.

Further, after rotating the rotor of the control motor from the origin position in the forward direction (or the reverse direction) by a predetermined angle, the rotor is rotated in the reverse direction (or the forward direction) by a predetermined angle to the origin position. Upon being positioned, the ram descends by the same amount as the above-mentioned corresponding amount of lift and returns to the original height position.

As described above, by appropriately operating the control motor to rotate the drive shaft in the forward direction and the reverse direction, the ram moves from the ascending height position to the original height position (falling height position). You can move up and down at.

When the casing is detachably provided on the main frame of the press machine, after the ram elevating / lowering device is assembled outside the main body frame of the press machine, the casing of the ram elevating / lowering device is mounted on the main body of the press machine. The press machine is assembled by mounting it on the frame. Further, after the casing of the ram lifting / lowering device is removed from the main body frame, maintenance of the ram lifting / lowering device is performed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to this embodiment will be described below with reference to the drawings.

Referring to FIG. 1, a ram lifting / lowering operation device 1 of a press machine is provided with a casing 5 for guiding a ram 2 up and down under a non-rotatable state. The body frame 7 is detachably provided via a plurality of mounting bolts 9. In order to allow the ram 3 to move up and down with respect to the casing 5 in a non-rotatable state, vertically extending guide grooves 11 are provided at appropriate positions on the left and right (left and right in FIG. 1) of the casing 5. An elevating piece 13 provided so as to be vertically movable and non-rotatable with respect to each guide groove 11 is attached to an appropriate position of the ram 3. A protruding piece 15 is provided below each guide groove 11 so as to vertically face the corresponding lifting piece 13, and the ram 3 is attached upward between the vertically facing lifting piece 13 and the protruding piece 15. A biasing spring 17 is mounted via a positioning pin. The ram 3 is provided with a slide groove 19 guided by the protruding piece 15.

A drive shaft 23 extending vertically is provided in the casing 5 so as to be vertically movable and rotatable. That is,
A fixed block 25 provided on the upper side in the casing 5 guides and supports the vicinity of the upper end of the drive shaft 23 so as to be vertically movable and rotatable, and a bearing portion 29 of a fixed block 27 provided on the lower side in the casing 5 is provided. Rotatably guides and supports the vicinity of the lower end of the drive shaft 23.

In order to rotate the drive shaft 23 in the forward and reverse directions within a predetermined angle range, the casing 5
A servo motor unit 31 is provided on the upper side of the.

More specifically, a box-type motor base 33 is provided on the upper side of the casing 5, and a rotor 37 which constitutes a part of the servomotor 35 is provided in the motor base 33. A rotor 39 is provided which is rotatable with respect to the stator 37 and which can be raised and lowered. The rotor 39 is integrally connected to the upper end of the drive shaft 23 via a plurality of mounting bolts.

A plurality of first links 41 and a plurality of second links 4 are provided for raising and lowering the drive shaft 23 in conjunction with rotation.
There is provided a link device 45 provided with 3.

More specifically, in the central portion of the drive shaft 23,
A fixed block 47 is integrally provided via a mounting bolt, and a plurality of (four in this embodiment) lower ends 41 of the first links 41 are provided on the upper peripheral edge of the fixed block 47.
a is swingably connected at a predetermined interval. Further, upper ends 41b of a plurality of first links 41 are swingably connected to a peripheral portion of the fixed block 25 at a predetermined interval, and the plurality of first links 41 have a lower end as shown in the figure. It is inclined so as to spread from the portion 41a to the upper end portion 41b. The lower end portion 41a and the upper end portion 41b of the first link 41 have a spherical shape, and the lower end portion 41a and the upper end portion 41b of the first link 41 are not separated from the fixed blocks 47 and 25 via the ball receiver 49. It has become.

Similarly, a plurality of (four in this embodiment) upper ends 43b of the second links 43 are swingably connected to the lower peripheral edge of the fixed block 47 at predetermined intervals. The lower ends 43a of the plurality of second links 43 are swingably connected to the peripheral edge of the fixed block 27 at predetermined intervals. The plurality of second links 43 are inclined so as to spread from the upper end portion 43b to the lower end portion 43a as shown in the figure, and the lower end portion 43 of the second link 43 is formed.
a, the upper end portion 43b is a fixed block 2 via a ball receiver 49.
It is designed not to leave from 7,47.

The operation of this embodiment will be described based on the above-mentioned configuration.

Referring to FIGS. 1 and 5, the servo motor 3
By appropriately operating 5 to rotate the rotor 39 from the origin position in the positive direction (clockwise direction about the Z axis in FIG. 5) by a predetermined angle, the drive shaft 23 also rotates the rotor 3.
It rotates in the positive direction integrally with 9 by a predetermined angle. As a result, as shown in FIG. 5, the upper end portion 43b of the second link 43 is
Also rotates by a predetermined angle with respect to the lower end portion 43a, and the lower end portion 43a of the second link 43 rises from the original height position by an amount corresponding to the predetermined angle. Further, the lower end portion 41a of the first link 41 also rotates by a predetermined angle with respect to the upper end portion 41b, and the lower end portion 41a of the first link 41 rises from the original position by the amount of rise corresponding to the predetermined angle. Therefore, by rotating the rotor 39 of the servomotor 35 in the positive direction from the origin position by a predetermined angle, the drive shaft 23 moves from the original height position to the amount of rise of the lower end portion 41a of the first link 41 and the second amount.
As a result, the ram 3 rises by the amount corresponding to the sum of the amounts of the lower ends 43a of the links 43, and the ram 3 also rises from the original height plate by the amount corresponding to the above and is positioned at the elevated height position.
At this time, the ram 3 is biased upward by the spring 17.

After rotating the rotor 39 of the servomotor 35 from the origin position in the positive direction by a predetermined angle, the rotor 39 is rotated in the reverse direction (counterclockwise direction about the Z axis in FIG. 5) by a predetermined angle. By rotating the ram 3 to the original position, the ram 3 is lowered to the original height position against the urging force of the spring 17 by the same amount.

As described above, by appropriately operating the servo motor 35 to rotate the drive shaft 23 in the forward direction and the reverse direction, the ram 3 moves from the ascending height position to the original height position (falling height position). In this relationship, the punch can be moved up and down to press the punch at a position vertically below the ram 3. In addition,
The position of the ram 3 at the ascending height position or the original height position (falling height position) can be detected by the sensor 51 provided in the servo motor unit 31.

When assembling the press machine, the ram elevating / lowering device 1 is provided outside the main body frame 7 of the press machine.
After assembling, the casing 5 is attached to the main body frame 7. Further, when performing maintenance of the ram lifting / lowering operation device 1, the casing 5 is detached from the main body frame 7 of the press machine.

As described above, according to this embodiment, the ram 3 can be moved up and down without using a hydraulic cylinder, so that a hydraulic device such as a hydraulic pump and a hydraulic tank is unnecessary,
The structure of the ram lifting / lowering operation device 1 is relatively simple, and
The increase in cost of the ram lifting / lowering device 1 can be suppressed as much as possible.

Furthermore, the casing 5 of the ram lifting / lowering device 1
By detachably providing the main body frame 7 of the press machine, the press machine can be easily assembled, and the ram lifting / lowering device 1 can be appropriately maintained.
This has the effect of improving work efficiency.

FIG. 2 shows a ram lifting / lowering device 5 of the second embodiment.
3, the configuration of the ram lifting / lowering actuator 53 is almost the same as the configuration of the ram lifting / lowering actuator 1 of the first embodiment except the servo motor unit 55. Therefore, in the figure, corresponding components are designated by the same reference numerals and the detailed description thereof is omitted, and the configuration of the servo motor unit 55 will be described below.

Regarding the details of the servo motor unit 55, a box-type motor base 57 is provided on the upper side of the casing 5, and a pair of support members 59 which are vertically opposed to each other are provided in the motor base 57. Between the pair of support members 59, a stator 63 which constitutes a part of the servo motor 61 is provided, and a rotor 65 is rotatably provided via a plurality of support rollers 67. A stroke bearing 69 that guides the drive shaft 23 up and down is integrally mounted via a key to a rotor 65 that constitutes a part of the servo motor 61. The stroke bearing 69 is supported by upper and lower support members 59. It is rotatably supported via 71.

The second embodiment also has the same effect as that of the first embodiment under the same operation.

FIG. 3 shows a ram lifting / lowering device 73 of the third embodiment.
The configuration of the ram lifting device 73 is as follows.
Except for the servo motor unit 75, the configuration is substantially the same as that of the ram lifting / lowering actuator 1 of the first embodiment. Therefore, in the figure, corresponding components are given the same reference numerals and the description thereof is omitted, and the configuration of the servo motor unit 75 will be described below.

Regarding the details of the servo motor unit 75, a supporting bracket 77 is provided on the upper side of the casing 5, and the supporting bracket 77 has a servo motor 79.
Is installed. A drive pulley 83 is integrally attached to a rotary shaft (rotor) 81 of the servomotor 79.
A driven pulley 87 linked to the drive pulley 83 through a timing belt 85 is rotatably provided on the upper side of the casing 5 through a bearing 89. A stroke bearing 91 that guides and supports the drive shaft 23 so as to be able to move up and down is integrally attached to the driven pulley 87 via a key.

The second embodiment also has the same effect as the first embodiment and has the same effect.

FIG. 4 shows a ram lifting / lowering operation device 93 of the fourth embodiment.
The configuration of the ram lifting / lowering operation device 93 is almost the same as the configuration of the ram lifting / lowering operation device 1 of the first embodiment, and the same reference numerals are given to the corresponding components in the drawings, Only the differences will be described.

Guide bars 97 extending vertically are provided on the left and right lower projections 95 of the casing 5, and each guide bar 97 can freely move up and down a running portion 99 on the left and right (left and right in FIG. 4) of the ram 3. To guide you. A spring 101 for urging the ram 5 upward is elastically mounted between the projecting portion 95 and the traveling portion 99 of the guide bar 97.

A stator 107 which constitutes a part of the servomotor 105 in the servomotor unit 103 is provided in the middle of the casing 5, and the servomotor 1
The rotor 109 forming a part of 05 is connected to the fixed block 47 via a connecting pin.

In the fourth embodiment as well, the same operation as that of the first embodiment is performed and the same effect is obtained.

The present invention is not limited to the above description of the embodiments, but can be implemented in various other modes by making appropriate changes.

[0037]

As can be understood from the above description of the embodiments, according to the present invention, the ram can be raised and lowered without using a hydraulic cylinder, so that the hydraulic pump,
This eliminates the need for a hydraulic device such as a hydraulic tank, has a relatively simple configuration of the ram lifting / lowering device, and can keep the cost of the ram lifting / lowering device high.

Further, when the casing of the ram lifting / lowering device is detachably provided on the main frame of the press machine,
The press machine can be easily assembled, and the ram lifting / lowering device can be appropriately maintained, which has the effect of improving work efficiency.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a ram lifting / lowering actuator according to a first embodiment.

FIG. 2 is a sectional view of a ram lifting / lowering operation device according to a second embodiment.

FIG. 3 is a sectional view of a ram lifting / lowering operation device according to a third embodiment.

FIG. 4 is a sectional view of a ram lifting / lowering operation device according to a fourth embodiment.

FIG. 5 is an explanatory view of the operation of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ram lifting device 3 Ram 5 Casing 7 Main body frame 23 Drive shaft 35 Servo motor 39 Rotor 41 First link 43 Second link

Claims (2)

[Claims] 1. A press machine is provided with a casing that guides a ram up and down under a non-rotatable state, and a vertically extending drive shaft is provided in the casing so as to be vertically movable and rotatable. In order to rotate in the forward and reverse directions within a range of a predetermined angle, a control motor having a rotor capable of rotating in the forward and reverse directions is provided, and the rotor is provided so as to be connected to the drive shaft. In order to move up and down in conjunction with rotation, a first link whose one end is connected to a drive shaft is provided at an inclination, and the other end of this first inclined link is connected to the casing and one end is connected to the ram. A ram lifting / lowering operation device in a press machine, wherein a second link is provided so as to be inclined, and the other end of the second link is connected to the drive shaft. 2. The casing is detachably provided on a body frame of a press machine.
A ram lifting / lowering operation device in the press machine described.