JP2593494B2 - Drives in press machines - Google Patents

Description

Description: Object of the Invention (Industrial application field) The present invention relates to a drive device for a press machine that adjusts the vertical movement of a slide in a press machine and the position of the slide in advance.

(Prior Art) Conventionally, in a press machine, a drive device for moving a slide up and down and a drive device for adjusting a slide position in advance are separately provided, and drive control is performed independently of each other. In addition, recently, in order to make the number of strokes of the slide continuously variable, the slide drive device is often controlled by an inverter.

On the other hand, the speed of the slide adjustment by the slide adjustment drive device is performed at a constant speed by a constant speed rotation of the motor and a mechanical deceleration mechanism.

(Problems to be Solved by the Invention) By the way, when the difference between the die height of the die and the press die height is large, the speed of the slide adjustment should be increased, and when the subtle slide adjustment is to be performed, the speed of the slide adjustment should be reduced. However, since the current slide adjustment driving device has a constant speed, the slide speed cannot be adjusted.

Therefore, when an attempt is made to control the slide adjustment drive device by inverter, there is a problem that the drive device itself becomes large-scale, the space becomes large, and the cost increases.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to provide a compact and low-cost drive unit for both a slide drive unit and a slide adjustment drive unit, and to control a slide adjustment speed in a press machine. Is to provide.

[Structure of the Invention] (Means for Solving the Problems) In view of the above-described conventional problems, the present invention relates to a lower end of a connecting rod whose upper end is inserted into a crankshaft rotated by a slide drive motor. Drive in a press machine, which is provided with a slide supporting the connecting rod so as to be capable of adjusting the vertical position with respect to the connecting rod, and a slide adjusting motor for adjusting the vertical position of the slide with respect to the connecting rod. In the apparatus, a speed control unit that controls the speed of the slide drive motor and a speed control unit that controls the speed of the slide adjustment motor are provided in common, and the speed control unit is used for the slide drive motor. Or, a switching circuit for switching to the slide adjusting motor is provided, and the slide adjusting motor is provided. Detects that the slide during descent adjustment of the slide is close to the mold by the drive is made by providing a sensor for switching the speed of the descent adjustment of the slide in the low speed to the slide.

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

Referring to FIGS. 3 and 4, a slide 7 that moves up and down along slide guides 5R and 5L is provided at an upper portion of the frame 3 of the press machine 1.

An upper frame 9 above the slide 7 is provided with a crankshaft 11. One end of the crankshaft 11 is linked to a slide drive motor 15 via a gear mechanism 13.

On the lower surface of the slide 7, an upper sub-plate 17 having an upper die not shown is detachably mounted.

Further, a bed 19 is integrally attached to a lower portion of the frame 3, and a bolster 23 for detachably mounting a lower sub-plate 21 having a lower mold (not shown) is mounted on the bed 19. Have been.

One end (upper end) of a vertically movable connecting rod 25 is fitted into the crankshaft 11, and a connection screw 27 is connected to the other end (lower end) of the connecting rod 25. That is, as shown in FIG. 2, a female screw 25A is formed at the inner peripheral portion at the other end of the connecting rod 25, while a male screw 27A is formed at the outer peripheral portion at one end (upper end) of the connection screw 27.
Are formed, and the male screw 27A is screwed and connected to the female screw 25A. Therefore, connecting rod 25
Since the male screw 27A of the connection screw 27 is screwed to the female screw 25A of the connection screw 27, the connection screw 27 is adjusted up and down with respect to the connecting rod 25 by rotating the connection screw 27. .

A spherical portion 27B is provided at the lower part of the connecting screw 27.
Are provided integrally. A connecting member 31 is connected to the spherical portion 27B via a half-shaped engaging member 29 to be engaged with the spherical portion 27B. A gear 33 is fitted over the cylindrical upper part of the connecting member 31. A cylindrical member 35 is fitted into the upper end portion of the connecting member 31 so as to hold the gear 33 and is attached to the frame 3. A slide adjusting motor 37 for driving the gear 33 is attached to the frame 3.

With the above configuration, by driving the slide adjusting motor 37, the gear 33 is rotated and the connecting member 31, the engaging member
The spherical portion 27B of the connecting screw 27 is rotated via 29. By rotating the spherical portion 27B, the height of the connecting screw 27 with respect to the connecting rod 25 is adjusted, and the die height is adjusted.

A limit switch 39 as a sensor is provided on a part of the upper sub-plate 17 attached to the lower part of the slide 7, and the limit switch 39 is connected to the lower sub-plate.
The slide 7 descends at a high speed until it comes into contact with the upper die of the mold K placed on the upper portion 21. After the contact, the slide 7 is automatically switched to descend at a low speed.

FIG. 1 is a block diagram showing the configuration of a control circuit for controlling the speeds of the slide drive motor 15 and the slide adjustment motor 37.

In FIG. 1, a common speed controller for controlling the speeds of the slide drive motor 15 and the slide adjustment motor 37 is shown.
41 are provided. A switching circuit 43 for switching to the slide drive motor 15 or the slide adjustment motor 37 is connected to the common speed control unit 41. A switch 45 is connected to a connection line connecting the slide drive motor 15 to the common speed control unit 41, and a switch is connected to a connection line connected to the slide adjustment motor 37 to the speed control unit 41. 47 is connected.

The switches 45 and 47 are formed by an interlock circuit, and when the switch 45 is in the ON state, the switch 47 is turned off.
F, and when switch 47 is ON, switch 4
5 is set to OFF.

The common speed controller 41 has the limit switch 39
Speed of the slide 7 descent adjustment by the detection operation of
A switch circuit 49 for switching to low speed is connected, and the switches 49A and 49B are formed by an interlock circuit like the switches 45 and 47.

When the slide drive motor 15 is driven by the above configuration, the start switch of the slide drive motor 15 is turned on by the switching circuit 43, so that the speed control unit 41 is turned on.
Is activated, and a predetermined speed command is issued, and the switch 45 is turned ON. (The switch 47 is in the OFF state.) When the switch 45 is turned on, the slide drive motor 15 is driven and the slide 7 is moved up and down at a constant speed.

When the start switch of the slide drive motor 15 is turned off by the switching circuit 43 and the die height of the slide 7 is adjusted, the start switch of the slide adjustment motor 37 is turned on, so that the speed control unit 41 adjusts the slide. The speed is converted for the motor 37, and a high-speed switch 49A set in advance by the switch circuit 49 is turned on to issue a speed command. Thus, switch 47 is turned on (switch 45 is turned on
F. ), The slide adjusting motor 37 is driven, and the slide 7 descends at high speed. Limit switch 39
When, for example, the upper die of the die K contacts, the switch 49B of the switch circuit 49 is turned on (the switch 49A is turned off), and a preset low-speed speed command is issued, and the slide adjusting motor 37 is driven at a low speed. Rotated. As a result, the die height adjustment of the slide 7 is performed accurately and reliably.

With the above configuration, the switching circuit 43 is used for the slide drive motor 15 or the slide adjustment motor.
37, the respective speeds are selected by the common speed control unit 41, a speed command is issued, and the slide drive motor 15 and the slide adjustment motor 37 are driven to move the slide 7 up and down. Alternatively, the height of the slide 7 is adjusted. Therefore, since the common speed control unit 41 is provided to drive the slide drive motor 15 or the slide adjustment motor 37, as a drive device for a press machine, the manufacturing cost can be reduced and the device can be downsized. Space saving is achieved. Further, the driving device has a reduced number of components and improved reliability.

The slide adjustment motor 37 is connected to the limit switch 39.
Can be switched from a high speed to a low speed by the detection by the, the fine adjustment can be performed accurately and reliably.

The present invention is not limited to the above-described embodiment, but can be implemented in other manners by making appropriate changes.

[Effects of the Invention] As can be understood from the above description of the embodiments, in short, the present invention provides a connecting rod (10) whose upper end is inserted into a crankshaft (11) rotated by a slide drive motor (15). A slide (7) is provided at the lower end of the connecting rod (25) so as to be vertically adjustable with respect to the connecting rod (25), and the vertical position of the slide (7) with respect to the connecting rod (25) is adjusted. In a driving device for a press machine provided with a slide adjusting motor (37) for adjustment, a speed control unit for controlling the speed of the slide driving motor (15) and a speed control of the slide adjusting motor (37) And a speed controller for switching between the slide drive motor (15) and the slide adjustment motor (37). A switching circuit (43) for detecting the proximity of the slide (7) to the mold when the slide (7) is lowered by driving the slide adjusting motor (37). The slide (7) is provided with a sensor (39) for switching the speed of the downward adjustment of (7) to a low speed.

As is apparent from the above configuration, in the present invention, a speed control unit for controlling the speed of the slide drive motor 15 for rotating the crankshaft 11 and a connecting rod 25
In addition, since a speed control unit for controlling the speed of the slide adjusting motor 37 for adjusting the vertical position of the slide 7 is provided in common, the configuration of the motor control system can be simplified. .

Further, in the present invention, when the slide adjusting motor 37 is driven to perform the downward adjustment of the slide 7,
The slide 7 is provided with a sensor 39 for detecting that the slider 7 has approached the mold and switching the speed of the descent adjustment to a low speed.
When the descent is performed at a high speed, the sensor 39 detects the die and switches to low speed when approaching the die, so that the slide 7 comes into contact with the die slowly and damages the die. That is not something.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a control circuit for controlling the speeds of a slide drive motor and a slide adjustment motor, which are main components of the present invention. FIG. 2 is an enlarged detailed view of a portion viewed in the direction of arrow II in FIG. 3, FIG. 3 is a schematic front view of a press machine embodying the present invention, and FIG. 4 is a schematic right side view in FIG. 1 ... Press machine 7 ... Slide 15 ... Slide drive motor 37 ... Slide adjustment motor 41 ... Speed control unit 43 ... Switch unit

Claims (1)

(57) [Claims] An upper and lower position of a connecting rod (25) having an upper end fitted to a crankshaft (11) rotated by a slide drive motor (15) is adjusted with respect to the connecting rod (25). Driving in a press machine provided with a slide (7) supported as possible and a slide adjusting motor (37) for adjusting the vertical position of the slide (7) with respect to the connecting rod (25). In the apparatus, a speed control unit for controlling the speed of the slide drive motor (15) and a speed control unit for controlling the speed of the slide adjustment motor (37) are provided in common. For the slide drive motor (15) or the slide adjustment motor (37)
A switching circuit (43) for switching the slide (7), and detecting that the slide (7) has approached the mold when the slide (7) is lowered by driving the slide adjusting motor (37). A driving device for a press machine, wherein a sensor (39) for switching the speed of the lowering adjustment of the slide (7) to a low speed is provided on the slide (7).