JPH0360600B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanical press having a flywheel, such as a crank press, whose stroke operation can be controlled with high precision.

A conventionally known mechanical press having a flywheel, such as a crank press, is connected to a rotary drive source such as a motor through a coupling member such as a clutch or a brake, and one press is connected to a crankshaft rotated by the drive source. Alternatively, two flywheels are attached, a slide including a punch is attached to the crankshaft via a connecting rod, and each of these members is attached to a frame.

The stroke operation of the above-mentioned crank press is controlled by controlling a single rotary drive source, clutch, and brake, but large-capacity presses and high-speed operation type presses require quick response characteristics. Moreover, it is extremely difficult to control the stroke operation with high precision.

In view of the current state of stroke operation control of mechanical presses with flywheels such as the conventional crank presses mentioned above, the present invention has been developed to provide quick and highly accurate stroke operation even for large-capacity or high-speed operation type presses. The aim is to provide a mechanical press that can be controlled.

Next, embodiments of the present invention will be described with reference to the drawings.

1 is a crankshaft which is a mounting shaft for the flywheel and converts its rotational motion into reciprocating motion; 2 is a connecting rod attached to the shaft; 3 is a slider including a punch attached to the rod 2; The shaft 1 and slider 3 are mounted on a frame (not shown) so that when the crankshaft 1 rotates, the slider slides back and forth on the frame.

Then, clutch one flywheel 4,
It is attached to one end side 1a of the shaft 1 via a brake coupling member 41, and the other flywheel 5 is attached to the clutch and the brake coupling member 51.
attached to the other end side 1b of the shaft 1 via the
Motors 42 and 52 as drive sources are separately provided for each of the flywheels 4 and 5, respectively.

The press has two flywheels 4 and 5 connected to motors 42 and 52, respectively, and
Each motor 42, including the flywheels 4, 5, is attached to the common crankshaft 1 via joint members 41, 51.
52 at the same time, or each may be connected and driven separately.

This means that one press machine can be used as a press with two or three types of power (inertia), and speed control or positioning control during stroke operation of the slider 3 can be performed more quickly. This also means that it can be done minutely.

That is, since both flywheels 4 and 5 are rotated by separate motors 42 and 52, respectively,
The sliding speed of the slider 3 can be easily and quickly accelerated by selecting a larger power, and the sliding speed can be decreased by, for example, disengaging the clutch 41 of one of the flywheels 4 and applying the brake. This is because if the brake on the other flywheel 5 side is applied at the same time, this can be done quickly. Furthermore, when the flywheels 4 and 5 are connected to the crankshaft 1 and are in operation, by separating and connecting one of them to the crankshaft 1, the speed change of the stroke operation of the slider 3 can be controlled. It is also possible to

Further, as shown in FIG. 2, the speed change of the flywheel 4 and/or 5 is performed between the joint member 41 and/or 51 and the connecting rod 2 on the crankshaft 1. This can also be achieved by inserting a gear train structure transmission mechanism 6 including an electromagnetic clutch. When the transmission mechanism 6 is inserted, it is possible to expand the speed change control range of the stroke operation that can be selectively transmitted to the shaft 1 within the speed change range of the speed change mechanism 6.

As can be understood from the description of the above embodiment, the press of this embodiment can realize an extremely wide range of stroke operating conditions with one press machine, so it can be adjusted depending on the slow stroke speed or the large or small press capacity. It can be used for various press operations and is extremely useful.

Although the above-mentioned embodiment relates to a crank press, it goes without saying that the present invention can be applied to a press machine of a type in which the output of a drive source is converted into a stroke operation via a flywheel. Further, in the above embodiment, two flywheels 4 and 5 are provided, and their rotations are connected to the crankshaft 1 simultaneously or separately.
However, the present invention has three
More than one flywheel may be attached to the crankshaft 1 via clutch and brake joint members, respectively, by providing separate rotational drive sources. In this way, the range of stroke operation states of the slider 3 is further expanded.

Next, an example of controlling the press configured as described above will be described.

The stroke speed, deceleration, and stop position of the slider 3 are controlled. In this embodiment, in order to control this, first, a unit slide of the slider 3 is placed between the slider 3 and a non-sliding member such as a frame. A length measuring device 11 that generates a pulse signal of 1 pulse per 0.01 mm, for example, is provided, or a rotation axis corresponding to the reciprocating movement of the slider 3, such as the crankshaft 1, is provided with a unit rotation angle, e.g. An encoder 12 that generates a pulse signal of 100 pulses per degree is provided, and the current position of the slider 3 is detected by the distance from an arbitrarily determined origin or by the rotation angle.

The positioning control of the slider 3 is performed, for example, by comparing a signal representing a scheduled position arbitrarily set in advance in the setting unit 13 with a signal representing the current position detected by the length measuring device or encoder. This is done by performing a comparison operation. Note that it is optional whether positioning is performed for each stroke or at the end of a certain press operation.

On the other hand, in order to control the stroke speed in the positioning control described above, a distance or rotation pulse signal corresponding to a unit movement distance or a unit rotation angle is extracted from pulse signals representing the current position detected by the length measuring device 11 or encoder 12. , by making this signal correspond to a time pulse signal from the oscillator T as appropriate, or
Alternatively, the current speed signal is created in the speed calculation unit 15 by associating a pulse signal representing the current position supplied from the length measuring device 11 or the encoder 12 within the unit time with a time pulse corresponding to the unit time. On the other hand, the calculation unit 16 compares this current speed signal with a scheduled speed signal arbitrarily set in advance in the setting unit 13 with a signal having the same unit as this signal.
This is done by performing a comparison operation at . In the figure, 17 is a control signal forming section, and 18 and 19 are drive sources 4 for the motors 42, 52 and the joint members 41, 51.
These are servo amplifiers 1a and 51a.

The above positioning control or the speed control in this positioning control is performed while a plurality of flywheels are connected to and separated from the rotating shaft simultaneously or separately. Therefore, response characteristics regarding acceleration and deceleration can be improved, and moreover, highly accurate control is possible. For example, if you are trying to slightly reduce the speed of the slide 3 that is operating the stroke by connecting both flywheels 4 and 5 and rotating the crankshaft 1, it will be effective to uncouple one of the flywheels 4. A predetermined deceleration can be achieved, and on the other hand, when increasing the speed of the slide 3, one of the flywheels separated from the crankshaft is connected to the shaft to increase the motor output. That's what I do.

As can be understood from the above description of the embodiments, the gist of the present invention is as described in the claims. 1 has a plurality of joint members 41, 51
A plurality of flywheels 4, 5 are connected via motors 42, 5, respectively.
52 is interlocked and connected. A position and speed detection device for detecting the position and speed of the slider 3 in the mechanical press is provided, and
It is equipped with first and second comparison calculation units 14 and 16 that compare the position and speed set in advance in the setting unit 13 and the position and speed detected by the detection device,
Further, based on the outputs of the first and second comparison calculation units 14 and 16, a control signal is formed for controlling the operation of each joint member 41 and 51 simultaneously or individually and controlling the output of each of the motors 42 and 52. 17.

Therefore, according to the present invention, each joint member 41,
By controlling the flywheel 4,
5 can be connected to or separated from the crankshaft 1 to drive the crankshaft 1, and the acceleration and deceleration response characteristics of the crankshaft 1 can be improved. The position and speed of the slider 3 can be controlled with high precision.

[Brief explanation of drawings]

FIG. 1 is a conceptual framework diagram of one embodiment of the press of the present invention, FIG. 2 is a conceptual framework diagram showing the main parts of another embodiment,
FIG. 3 is a control system block diagram showing an embodiment of the press control method of the present invention. 1...Crankshaft, 2...Connecting rod,
3...Slider, 4, 5...Flywheel, 41,
51... Joint member, 41a, 51a... Operation drive source of the coupling member, 42, 52... Motor, 6... Speed change mechanism,
DESCRIPTION OF SYMBOLS 11... Length measuring device, 12... Encoder, 13... Setting part, 14... Comparison calculation part, 15... Oscillator, 16... Comparison calculation part, 17... Control signal formation part, 18, 19...
servo amplifier.

Claims (1)

[Claims] 1. A mechanical press in which a slider 3 is interlocked and reciprocably connected to a rotatably provided crankshaft 1 via a connecting rod 2,
The crankshaft 1 is connected to a plurality of flywheels 4 and 5 via a plurality of clutches and a plurality of brake joint members 41 and 51, and each flywheel 4 and 5 is interlocked and connected to each motor 42 and 52. , a first slider comprising a position and speed detection device for detecting the position and speed of the slider 3, and comparing the current position detected by the position and speed detection device with a planned position arbitrarily set in advance in the setting section 13.
a comparison calculation unit 14, and a second comparison calculation unit 1 that compares the current speed detected by the position speed detection device and the scheduled speed arbitrarily set in advance in the setting unit 13.
6, and controls the operation of each of the joint members 41, 51 simultaneously or individually based on the outputs of the first and second comparison calculation units 14, 16, and also controls the operation of each of the motors 4.
1. A mechanical press comprising: a control signal forming section 17 for controlling the outputs of the mechanical presses 2 and 52.