WO2015141503A1

WO2015141503A1 - Press machine

Info

Publication number: WO2015141503A1
Application number: PCT/JP2015/056752
Authority: WO
Inventors: 西田　憲二
Original assignee: コマツ産機株式会社
Priority date: 2014-03-17
Filing date: 2015-03-06
Publication date: 2015-09-24
Also published as: JP2015174123A; JP6401470B2

Abstract

A press machine is provided with: a bolster (2) whereon a lower mold (2A) is disposed; a slide (5) whereon an upper mold (5A) is disposed; pull rods (6) the upper end parts of which are linked to the slide (5); a vertical movement mechanism (7) for driving vertical movement of the pull rods (6); and an adjusting device (8) having an adjustment unit (81) that is provided between the pull rods (6) and the slide (5) and is for adjusting the height position of the slide (5) to the pull rods (6).

Description

Press machine

The present invention relates to a press machine.

The press machine processes a workpiece between a lower die provided on a bolster and an upper die provided on a slide that is driven to move up and down. The slide is connected to a motor that is a power source, and a speed reducer and an eccentric mechanism are provided between the motor and the slide.
As such a press machine, there is known an underdrive type press machine in which a motor, a speed reducer, and an eccentric mechanism are arranged at the lower part of the press machine in order to reduce the height of the entire machine.

In this type of press machine, the upper ends of rods are connected to the left and right sides of the slide, and these rods are connected to an eccentric mechanism, a reducer, and a servo motor, respectively, and the eccentric mechanism, the reducer, and the servo motor are connected to a bed. There is a conventional example (Patent Document 1) arranged in the above.
Furthermore, a support base on which the lower mold is supported is provided on the frame, a slide is arranged above the support base, the upper ends of the guide posts are connected to both sides of the slide, and the lower portions of these guide posts are connected to the frame. There is a conventional example (Patent Document 2) which is connected to an under beam arranged inside and lifts and lowers by a drive motor and a screw shaft arranged inside the frame.

Further, there is a conventional example (Patent Document 3) in which one connecting rod is connected to each of the left and right sides of the slide, and an electric motor is connected to each connecting rod via a gear mechanism.
Furthermore, a tension rod is provided on each of the guides provided on the left and right sides of the frame so as to be movable up and down, the upper end of the tension rod is connected to the slide, and the lower end of the tension rod is connected to the eccentric shaft via a motion conversion mechanism. There is a conventional example (Patent Document 4).

German Patent Application Publication No. 102101066969 Japanese Utility Model Publication No. 6-34893 Japanese Utility Model Publication No. 51-95080 Japanese Utility Model Publication No. 49-57969

In the press machine, an adjusting device for adjusting the height position of the slide with respect to the bolster may be required depending on the size of the workpiece to be processed and other factors.
However, in the conventional examples shown in Patent Documents 1 to 4, there is no specific disclosure of the adjusting device, and therefore the height of the slide cannot be adjusted.

An object of the present invention is to provide a press machine capable of adjusting a slide height position with a simple structure in an underdrive type press machine.

The press machine according to the present invention includes a bolster having a lower die disposed on an upper surface, a slide in which an upper die facing the lower die is disposed on a lower surface and capable of moving up and down, and a pull rod having an upper end connected to the slide. And an elevating mechanism for elevating and driving the pull rod, and an adjusting device provided between the pull rod and the slide and having an adjusting unit for adjusting a height position of the slide with respect to the pull rod. .

In the present invention, the adjustment device includes an adjustment drive unit that drives the adjustment unit, and the adjustment unit includes a male screw provided at an upper end portion of the pull rod, a female screw portion that is screwed to the male screw, A worm wheel provided on an outer peripheral portion of the female screw portion; and a worm meshed with the worm wheel and rotatably supported by the slide; and the adjustment drive unit includes an adjustment motor and the adjustment motor. And a transmission mechanism for transmitting the rotation of the worm to the rotation of the worm.

In the present invention, the bed provided with the bolster, the upright having the slide position restricting portions that are respectively provided at the four corners of the bed and restrict the horizontal movement of the slide, and fixed to the upper portion of the upright Preferably, the top frame is provided with a balance cylinder that is provided on the top frame and balances the slide, and the slide has a recess for preventing interference with the balance cylinder.

In the present invention, it is preferable that the adjusting motor is disposed in the recess.

In the present invention, the bolster is provided in a bed, the bed has left and right bed legs and is arranged in a pit, and the lifting mechanism is connected to a servo motor and a lower end portion of the pull rod so as to freely move up and down. A connecting member, a speed reducer connected to the servo motor, and an eccentric mechanism connected to the speed reducer and moving up and down the connecting member, and a plurality of pull rods on each of the left and right sides of the slide. The connecting members are connected to lower end portions of the pair of pull rods on both the left and right sides, respectively, and the connecting members are respectively disposed on the left and right bed legs, and the speed reducer and the eccentric The mechanism and the servo motor are preferably provided on the left and right bed legs, respectively.

In the present invention, the top frame preferably has a plate portion covering the balance cylinder.

In the present invention, when the lifting mechanism operates, the slide moves up and down via the pull rod. Since the upper die is arranged on the slide and the lower die is arranged on the bolster, when the workpiece is set between the upper die and the lower die, the workpiece is pressed as the slide moves up and down. .
In order to install the dies having different die heights according to the workpiece to be processed, the lifting mechanism is stopped and the adjusting device is operated. Then, the height of the pull rod of the slide is adjusted by the adjusting unit of the adjusting device, and the height position of the slide with respect to the bolster is changed. When the height position of the slide is changed, the lifting mechanism is operated to resume the press work.
Therefore, in the present invention, adjustment of the height position of the slide can be realized by a simple configuration in which the adjustment portion of the adjusting device is provided between the slide and the upper end portion of the pull rod.
In addition, since the adjustment unit is arranged at the upper end of the pull rod and not at the lower end of the pull rod, the adjustment unit can be compared with the case where the adjustment unit is arranged at the lower end of the pull rod. The substructure is not complicated.

In the present invention, the adjustment unit includes a male screw provided at the upper end of the pull rod, a female screw unit, a worm wheel, and a worm, and a transmission mechanism and an adjustment motor are used to rotate the worm. Thus, the adjustment of the height position of the slide can be realized with a simpler configuration.

In the present invention, since the movement of the slide in the horizontal direction is restricted by providing the upright slide position restricting portion, the height position of the slide can be adjusted accurately. Moreover, by providing a balance cylinder in the top frame, the height position of the slide can be adjusted without using a large force.
In addition, the slide has a recess for preventing interference with the balance cylinder, so that the height of the top frame can be set low.

In the present invention, when the adjusting motor is disposed in the concave portion of the slide, not only the adjusting portion but also the adjusting driving portion is not disposed at the lower end portion of the pull rod, so that the lower structure of the press machine is further simplified. be able to.

In the present invention, if a plurality of pull rods on both the left and right sides can be moved up and down by one connecting member, and the connecting member, the speed reduction mechanism, the eccentric mechanism and the servo motor are provided on the left and right bed legs, these devices Does not require a large place to install. In addition, since it is not necessary to arrange the speed reduction mechanism, the eccentric mechanism, and the servo motor according to the number of pull rods, the number of parts of the press machine can be reduced and the manufacturing cost can be suppressed.

In the present invention, since the upper portion of the balance cylinder is covered by the plate portion of the top frame, the movement of the balance cylinder can be restricted by the plate portion even if a large force is applied toward the upper portion of the balance cylinder.

The front view which fractured | ruptured a part of press machine concerning one Embodiment of this invention. The side view which fractured | ruptured a part of press machine. The top view which shows the lower part of a press machine. The schematic perspective view which shows the relationship between a servomotor, a reduction gear, an eccentric mechanism, and a connection member. The side view which shows a die cushion. The top view which shows the upper part of a press machine. The front view which shows the principal part of an adjustment apparatus.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 show the overall configuration of the press machine according to the present embodiment. In FIG. 1, the left side indicates the position on the left side of the press, and the right side indicates the position on the right side of the press. In FIG. 2, the left side shows the position on the front side of the press, and the right side shows the position on the back side of the press.
[Description of overall configuration of press machine]
The press machine includes a bed 1 arranged in the pit P, a bolster 2 provided on the bed 1, an upright 3 erected at the four corners of the bed 1, and a top fixed to the upper part of the upright 3. Adjusting the height position of the frame 4, the slide 5 provided on the top frame 4 so as to be movable up and down, the pull rod 6 whose upper end is connected to the slide 5, the lifting mechanism 7 for driving the pull rod 6 up and down, and the slide 5 And an adjusting device 8. The press machine of this embodiment can be applied to a single press, a transfer press, and other press devices. Moreover, the press machine of this embodiment is applicable also as one press apparatus which comprises a tandem press line.

The bed 1 includes a bed leg 1L disposed on the left with respect to the front surface, a bed leg 1R disposed on the right, and a center bed 1C disposed between the

bed legs

1L and 1R.
A bolster 2 is installed on the upper surface of the bed 1 via a carrier 2B, and a lower mold 2A is arranged on the upper surface of the bolster 2. An upper mold 5A is disposed on the lower surface of the slide 5 so as to face the lower mold 2A. When the upper die 5A is lowered toward the lower die 2A in a state where a workpiece (not shown) is arranged on the lower die 2A, the workpiece is pressed. In the present embodiment, the bolster 2 may be disposed directly on the upper surface of the bed 1.
A die cushion 10 is provided on the center bed 1C.

The pit P is a substantially rectangular parallelepiped when it is a single pit. A substantially rectangular parallelepiped projecting portion P1 is provided from the front wall and the rear wall of the pit P, and the upper surface of the projecting portion P1 is lowered with respect to the ground surface G (see FIG. 2). The left and

right bed legs

1L, 1R extend in the front-rear direction, are placed on the overhanging portion P1 of the pit P, and are fixed to the overhanging portion P1 with anchor bolts (not shown). The left and right dimensions of the overhanging part P1 are set with a predetermined margin in the width of the left and

right bed legs

1L and 1R. By suppressing the left and right dimensions of the overhanging portion P1, a maintenance space before and after the center bed 1C is secured, and a pit installation location such as an oil tank (not shown) is secured. Pit construction is costly and requires flooring around the press machine, so the pit dimensions are usually kept to a minimum. The left and

right bed legs

1L and 1R must support the total weight of the press machine in consideration of the generated acceleration. Therefore, the strength of the structure of the

bed legs

1L and 1R must be increased, and the interval between the projecting portions P1 of the front and rear pits P must be reduced.

The top frame 4 does not incorporate a slide drive mechanism, and is provided with two balance cylinders 40 that balance the slide 5. Therefore, the balance cylinder 40 and the upper mold 5 A can be deeply inserted into the top frame 4.
The top frame 4 has a plate portion 4 A that covers the balance cylinder 40. The top frame 4 has a function of preventing the uprights 3 from falling by being fixed to the upper surfaces of the four uprights 3.
The slide 5 is provided with a recess 50 that is open upward to prevent interference with the balance cylinder 40. That is, the recess 50 is a space for the balance cylinder 40 to enter at the position where the slide 5 indicated by the reference numeral 5T in FIG.
The balance cylinder 40 includes a cylinder 40A, a piston 40B housed in the cylinder 40A so as to be movable up and down, and a connecting rod 40C having an upper end connected to the piston 40B and a lower end connected to the middle plate 50A of the recess 50. . The lower end portion of the connecting rod 40C has a locking portion 40D that locks with the middle plate portion 50A.

[Explanation of lifting mechanism]
FIG. 3 shows the lower plane of the press machine.
1 to 3, the elevating mechanism 7 includes a servo motor 70, a connecting member 71 to which the lower end portion of the pull rod 6 is connected, a speed reducer 72 connected to the servo motor 70, and a speed reducer 72 connected to the speed reducer 72. And an eccentric mechanism 73 that raises and lowers the member 71. The servo motor 70, the connecting member 71, the speed reducer 72, and the eccentric mechanism 73 are disposed on the left bed leg 1L and the right bed leg 1R, respectively.

The left and

right bed legs

1L and 1R are provided with connecting member position restricting plates 74 that vertically restrict the movement of the connecting member 71 in the horizontal direction.
Four connecting member position restricting plates 74 are arranged so as to surround the central portion of the connecting member 71.
The eccentric mechanism 73 is only shown on the left side in FIGS.
The left and

right bed legs

1L, 1R are provided with oil pans 73A for storing lubricating oil (not shown) for lubricating the eccentric mechanism 73, respectively.

The pull rod 6 has two pairs arranged on the left and right sides in the front and rear directions, and the lower ends thereof are connected to the connecting member 71.
The connecting member 71 includes two side surface plate portions 710 arranged at a predetermined interval, an upper surface plate portion 711 that joins the side surface plate portions 710 to each other, and a plurality of

ribs

712A and 712B.
An insertion space 71A opened downward is formed between the inner surfaces of the two side plate portions 710 and the two ribs 712A facing each other between the inner surfaces.

Blocks 75 as intervening members are rotatably supported by pins 76 at both ends of the two side plate portions 710, respectively. A female screw portion 75 A is formed at the upper end portion of the block 75. A male screw portion 6 A that engages with the female screw portion 75 A is formed at the lower end of the pull rod 6. The pull rod 6 may be directly connected to the connecting member 71 by devising the shape of the lower end portion of the pull rod 6.
The eccentric mechanism 73 includes a main shaft 77 connected to the speed reducer 72, a connecting rod 78 connected to the main shaft 77, and a connecting pin 79 that connects the upper end of the connecting rod 78 to the lower portion of the connecting member 71. .
The upper part of the connecting rod 78 is accommodated in the insertion space 71A. Further, a reinforcing rib 712B is also provided in the insertion space 71A into which the upper portion of the connecting rod 78 enters.
In general, in the case of a servo press, since the motion setting of a slide is free, it is expected to be applied to many dies, but in order to apply it, a certain amount of slide stroke must be secured. That leads to allowing the connecting rod to grow. On the other hand, it is necessary to reduce the pit size. In order to satisfy both conditions, a connection member was used.

[Description of servo motor and reduction gear]
FIG. 4 shows the relationship among the servo motor, the speed reducer, the eccentric mechanism, and the connecting member.
1, 3, and 4, speed reducers 72 arranged on the left and right are an inconstant speed reducer 72 A connected to an eccentric mechanism 73, and a constant speed reducer 72 B connected to an inconstant speed reducer 72 A, respectively. It has. The unequal speed reducer 72A is a speed reducer that rotates at a predetermined unequal speed on the output shaft even when the input shaft rotates at a constant speed. For example, a Whitworth speed reducer is well known. The constant speed reducer 72B is a speed reducer that rotates the output shaft at a constant speed when the input shaft rotates at a constant speed.
The non-uniform speed reducer 72A is housed in a first case 721, and the first case 721 is attached to the outer surfaces of the

bed legs

1L and 1R.
Two constant speed reducers 72B are provided for one non-constant speed reducer 72A. These constant speed reducers 72B are housed in second cases 722, respectively. These second cases 722 are attached to the first case 721. In order to enable maintenance of the inconstant speed reducer 72A and the constant speed reducer 72B individually, the first case 721 and the second case 722 are formed with windows not shown.
Each second case 722 is provided with one servo motor 70 with the output shaft 70A up and down. That is, the two servo motors 70 and the two constant speed reducers 72B are connected to one non-constant speed reducer 72A and one eccentric mechanism 73.

[Description of die cushion]
The structure of the die cushion 10 is shown in FIG.
In FIG. 5, the die cushion 10 generates a die cushion load on the slide 5, and includes a cushion pad 11, a shock absorber 12, a support portion 13, and a die cushion drive mechanism 14.
The cushion pad 11 is a member that receives a force from the slide 5, and is provided so as to be movable in the vertical direction in the center bed 1C.
The shock absorber 12 is a device that reduces the impact between the cushion pad 11 and the support portion 13.
The support portion 13 is a portion that supports the cushion pad 11.
The die cushion drive mechanism 14 raises and lowers the support portion 13, and includes a pulley 15, a die cushion servomotor 16, and a belt 17 that transmits the rotation of the die cushion servomotor 16 to the pulley 15.
The pressing force transmitted from the slide 5 to the predetermined part of the lower mold 2A through the upper mold 5A is transmitted to the upper surface of the cushion pad 11 through the plurality of cushion pins 2C. The bolster 2 is formed with a plurality of through holes (not shown) for cushion pins.

[Description of Upright]
FIG. 6 shows the upper part of the press machine.
In FIG. 6, the upright 3 includes a planar T-shaped column main body 31 that faces the side corners of the slide 5, and a slide position restricting unit that is disposed between the column main body 31 and the side corners of the slide 5. 32.
The slide position restricting portion 32 restricts the movement of the slide 5 in the horizontal direction, and is arranged extending vertically in the inner corner portion of the column main body 31. In FIG. 6, reference numeral 320 denotes a slide frame.

[Explanation of adjusting device]
The adjusting device 8 includes an adjusting unit 81 provided between the pull rod 6 and the slide 5, and an adjusting driving unit 82 that drives the adjusting unit 81.
The adjustment drive unit 82 includes an adjustment motor 83 fixed to the middle plate portion 50 A of the slide 5, and a transmission mechanism 84 connected to the adjustment motor 83.
The adjusting motor 83 is composed of a servo motor, and its output shaft 83A is arranged to extend horizontally.
The transmission mechanism 84 includes a first transmission mechanism 85 coupled to the adjustment motor 83, a vertical shaft 86 coupled to the first transmission mechanism 85, and a second transmission mechanism 87 coupled to the vertical shaft 86.

The first transmission mechanism 85 includes a coupling mechanism 851 having an output shaft 850 coupled to the adjustment motor 83 and extending left and right, a rotating shaft 853 coupled to the output shaft 850 via a joint portion 852, and a rotating shaft 853. And a connecting mechanism 854 that connects the lower end of the vertical shaft 86.
An end portion of the rotation shaft 853 is inserted through a window portion 50B formed on the side wall of the slide 5, and the coupling mechanism 854 is supported on the left and right outer surface sides of the slide 5 by a mounting portion (not shown).
The vertical shaft 86 is disposed at an intermediate position between the paired pull rods 6.
The second transmission mechanism 87 includes a coupling mechanism 871 coupled to the upper end portion of the vertical shaft 86, and a rotating shaft 872 disposed at one end of the coupling mechanism 871 and extending horizontally.

A specific configuration of the adjustment unit 81 is shown in FIG.
6 and 7, the adjusting portion 81 includes a male screw 6B formed at the upper end portion of the pull rod 6, a female screw portion 810 screwed to the male screw 6B, and a worm wheel 811 provided on the outer peripheral portion of the female screw portion 810. And a worm 812 meshed with the worm wheel 811.
The female screw portion 810 includes a screw portion main body 810A and a flange portion 810B integrally joined to the lower end of the screw portion main body 810A.
The worm wheel 811 is fixed to the screw portion main body 810A using a key or the like (not shown). Therefore, when the worm 812 rotates, the male screw portion 810 also rotates through the worm wheel 811.
The worm 812 is rotatably supported by the holder 813. The holder 813 includes a holder main body 813A in which an internal space for housing the worm wheel 811 is formed, and a locking piece portion 813B formed in a ring shape at the lower end of the holder main body 813A. To prevent the holder main body 813A from interfering with the screw portion main body 810A, the inner periphery thereof is separated from the outer periphery of the screw portion main body 810A by a predetermined distance.

[Description of overload protection device]
As shown in FIG. 7, the slide 5 is provided with an overload protection device 9 that prevents overload applied to the pull rod 6.
The overload protection device 9 includes a first cylindrical body 91 fixed to the slide 5, a second cylindrical body 92 fixed to the pull rod 6, and a first cylindrical body 91 and a second cylindrical body 92. And a relief valve 93 communicated with an oil chamber 90 provided therebetween.
The first cylindrical body 91 has a disc portion 911 having an opening 910 formed at the center thereof, and a cylindrical portion 912 provided on the outer peripheral edge of the disc portion 911. A retaining ring 94 that prevents the second tubular body 92 from coming off is provided on the inner peripheral portion of the tubular portion 912.
A holder 813 is fixed to the first cylindrical body 91.
The second cylindrical body 92 has a cylindrical portion 921 and a flange 922 formed integrally with the upper end portion of the cylindrical portion 912, and the inner peripheral surface of the second cylindrical body 92 is the outer peripheral surface of the pull rod 6. And are slidably connected.
A wear plate 814 is provided on the upper surface of the flange 922. The wear plate 814 and the flange portion 810B of the male screw portion 810 are slidable.

The oil chamber 90 includes a space 90 A between the flange 922 and the disk portion 911, and an oil communication path 90 B that is communicated with the space 90 A and formed in the first cylindrical body 91.
The oil communication passage 90B communicates with a relief valve 93, and the relief valve 93 communicates with an oil tank (not shown).
Therefore, when an overload occurs between the slide 5 and the pull rod 6, the hydraulic pressure of the oil closed in the oil chamber 90 increases. When the hydraulic pressure exceeds a predetermined set value, the relief valve 93 is opened, and the oil in the oil chamber 90 returns to the oil tank. When the relief valve 93 is opened, a control device (not shown) stops raising and lowering the pull rod 6.

[Description of press working]
In order to perform press working using a press machine, after setting a workpiece between the upper mold 5A and the lower mold 2A, the servo motor 70 is operated.
Then, the rotations of the two servo motors 70 arranged on the left and right sides are transmitted to one inconstant speed reducer 72A through the constant speed reducer 72B, and the rotation of the inconstant speed reducer 72A is transmitted through the eccentric mechanism 73. Is transmitted as a lifting motion of one connecting member 71. Since there is one connecting member 71 on each of the left and right sides, when these connecting members 71 are lifted and lowered, the slide 5 is lifted and lowered via the pull rod 6 that is connected to the front and rear of the connecting member 71 as a pair. Since the slide 5 is restricted from moving in the horizontal direction by the slide position restricting portion 32 of the upright 3, the slide 5 is accurately raised and lowered toward the bolster 2. As the slide 5 moves up and down, the workpiece is pressed.
The left and right sides of the slide 5 are moved up and down by connecting members 71 via two pull rods 6, and the connecting members 71, the inconstant speed reducer 72 A, the constant speed reducer 72 B, the eccentric mechanism 73 and the servo motor 70 are moved to the left and right bed legs. Since it is provided in 1L and 1R, a large space for installing these devices is not required. Since it is not necessary to dispose the inconstant speed reducer 72A, the constant speed reducer 72B, the eccentric mechanism 73, and the servo motor 70 according to the number of the pull rods 6, the number of parts of the press machine can be reduced and the manufacturing cost can be suppressed. become.

[Explanation of adjustment]
The servo motor 70 is stopped and the adjusting device 8 is operated in order to install dies having different die heights according to the workpiece to be processed.
When the adjustment motor 83 is operated, the worm 812 of the adjustment unit 81 is rotated via the transmission mechanism 84. When the worm 812 rotates, the female screw portion 810 rotates together with the worm wheel 811 that meshes with the worm 812. The rotation of the female screw portion 810 causes the male screw 6B and the female screw portion 810 to move up and down relatively. Since the flange portion 810B of the female screw portion 810 is sandwiched between the wear plate 814 and the holder 813, when the female screw portion 810 moves up and down, the slide 5 also moves up and down, and the height of the slide 5 relative to the pull rod 6 is adjusted.

Since the adjustment portion 81 of the adjusting device 8 is provided between the slide 5 and the upper end portion of the pull rod 6, adjustment of the height position of the slide 5 can be realized with a simple configuration. And compared with the case where the adjustment part 81 is arrange | positioned at the lower end part of the pull rod 6, the lower structure of a press machine does not become complicated.
When the height adjustment of the slide 5 is completed, the adjustment motor 83 is stopped. As a result, the pull rod 6 does not move with respect to the slide 5, so that press working can be resumed. Since the worm 812 and the worm wheel 811 are used for the transmission mechanism 84 of the adjusting device 8, self-locking is applied. Therefore, it is not necessary to increase the size of the braking device that stops the rotation of the output shaft of the adjusting motor 83.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the embodiment, the two pull rods 6 on the left and right sides are moved up and down by one connecting member 71, and the connecting member 71, the speed reducer 72, the eccentric mechanism 73, and the servo motor 70 are provided on the left and

right bed legs

1R and 1L. In the present invention, the connecting member 71 may be omitted, and the pull rod 6 may be connected to the speed reducer 72, the eccentric mechanism 73, and the servo motor 70.
The number of pull rods 6 arranged in the front-rear direction of one connecting member 71 is not limited to two, and may be three or more.

The configuration of the adjusting device 8 of the present invention is not limited to the above embodiment. For example, in the present invention, a belt mechanism may be employed as a transmission mechanism that transmits the rotation of the adjusting motor 83 to the rotation of the worm 812.
Furthermore, it is not always necessary to provide the slide 5 with the recess 50 for preventing interference with the balance cylinder 40. And the installation place of the motor 83 for adjustment is not limited, For example, the upper edge of the slide 5 may be sufficient.
Further, the upper portion of the top frame 4 may be configured to be opened without providing the plate portion 4 A that covers the balance cylinder 40.

The present invention can be used for single press, transfer press, and the like.

DESCRIPTION OF SYMBOLS 1 ... Bed, 1L ... Left bed leg, 1R ... Right bed leg, 2 ... Bolster, 2A ... Lower mold, 3 ... Upright, 32 ... Slide position control part, 4 ... Top frame, 40 ... Balance cylinder, 4A ... Plate part, 5 ... Slide, 50 ... Recess, 5A ... Upper die, 6 ... Pull rod, 6A ... Male screw part, 6B ... Male screw, 7 ... Lifting mechanism, 70 ... Servo motor, 71 ... Connecting member, 72 ... Reducer , 721 ... First case, 722 ... Second case, 72A ... Non-uniform speed reducer, 72B ... Constant speed reducer, 73 ... Eccentric mechanism, 73A ... Oil pan, 74 ... Position restriction plate for connecting member, 77 ... Main Shaft, 78 ... Connecting rod, 8 ... Adjusting device, 81 ... Adjusting part, 810 ... Female thread part, 811 ... Worm wheel, 812 ... Worm, 82 ... Adjusting drive part, 83 ... Adjusting motor 84 ... transmission mechanism, P ... pit

Claims

A bolster with a lower mold placed on the upper surface;
A slide in which an upper mold facing the lower mold is arranged on the lower surface and can be moved up and down;
A pull rod having an upper end connected to the slide;
An elevating mechanism for elevating and driving the pull rod;
An adjusting device provided between the pull rod and the slide and having an adjustment unit that adjusts a height position of the slide with respect to the pull rod.
The press machine according to claim 1,
The adjusting device includes an adjusting driving unit that drives the adjusting unit,
The adjusting portion includes a male screw provided on an upper end portion of the pull rod, a female screw portion screwed to the male screw, a worm wheel provided on an outer peripheral portion of the female screw portion, and a worm wheel meshed with the slide. And a worm supported rotatably on the
The adjusting machine includes: an adjusting motor; and a transmission mechanism that transmits the rotation of the adjusting motor to the rotation of the worm.
In the press machine according to claim 1 or 2,
A bed provided with the bolster, an upright having a slide position restricting portion that is provided at each of the four corners of the bed and restricts movement of the slide in the horizontal direction, and a top frame fixed to an upper portion of the upright And a balance cylinder provided on the top frame for balancing with the slide,
The press machine, wherein the slide has a recess for preventing interference with the balance cylinder.
The press machine according to claim 3,
The press machine, wherein the adjusting motor is disposed in the recess.
The press machine according to any one of claims 1 to 4,
The bolster is provided in a bed;
The bed has left and right bed legs and is arranged in a pit,
The elevating mechanism includes a servo motor, a connecting member connected to a lower end portion of the pull rod to be freely raised and lowered, a speed reducer connected to the servo motor, and an eccentricity connected to the speed reducer to raise and lower the connecting member. A mechanism,
The pull rod is a plurality of pairs on the left and right sides of the slide,
The connecting members are connected to the lower ends of the pull rods that are a pair of the plurality of left and right sides, respectively, and the connecting members are respectively disposed on the left and right bed legs,
The press machine, wherein the speed reducer, the eccentric mechanism, and the servo motor are provided on the left and right bed legs, respectively.
In the press machine according to any one of claims 3 to 5,
The press machine, wherein the top frame includes a plate portion that covers an upper portion of the balance cylinder.