JPS60161016A - Control method of mechanical shearing machine - Google Patents

Abstract

PURPOSE:To enable a machine to both obtain a material of good cutting section and cut the material in larger thickness even when the machine generates a smaller output, by repeatedly giving a fast and slow rotating motion to the rotary shaft of an upper blade when it is actuated cutting the material and causing the upper blade to vibratively perform its stroke action. CONSTITUTION:The stroke motion of an upper blade 1 is performed by control of, for instance, an open loop system. First, for instance, a stroke position of the upper blade 1, being replaced with the rotary angle of a crankshaft 5, is continually detected by a rotary angle detector 8 mounted to the crankshaft 5. While rotation of a motor 6 is controlled by giving a speed change to the motor 6 when the upper blade 1 is lowered. And a cycle of the above speed change and a change width of its speed are set to a setter part 9, further each pulse signal from said detector 8 and an oscillator 10 is supplied to the setter part 9. Then the setter part 9, processing its preset value by a processing part 11 to a control signal in a driving control part 12 for the motor 6, actuates the motor 6 by an output of the driving control part 12 as set by the preset value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of controlling a mechanical shearing machine.

Mechanical shearing machines are widely used in the sheet metal processing field as cutting machines for sheet materials. In conventional mechanical shearing machines, in order to achieve good cuts and cut surface roughness, it is possible to adjust the clearance between the upper and lower blades, and adjust the amount of forward inclination and rake angle.
Various methods have been adopted.

However, there are limits to conventional clearance adjustment, rake angle adjustment, etc. in order to obtain a good cut surface with little sag or fracture.

In view of the current state of cutting using conventional mechanical shearing machines, the present invention not only makes it possible to achieve cutting with an even better cutting surface, but also achieves the cutting ability (plate thickness) of conventional mechanical shearing machines even when the drive source output is small. This was done with the purpose of presenting a control method for a mechanical shearing machine that is capable of cutting the materials mentioned above, and its configuration is such that when the upper blade is cutting in the mechanical shearing machine, the upper blade has a stroke. It is characterized in that the upper blade is caused to perform a vibratory stroke operation within an appropriate range by applying controlled repeated slow and fast rotations to the rotating shaft that provides the operation.

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

The illustrated mechanical shearing machine is of a slide guide type; 1 is an upper blade, 2 is a ram with the upper blade attached to the lower end, 3 is a slide guide for the ram, and 4 is an upper end attached to the ram 2. The connecting rods 5 are a full eccentric type crankshaft pivotally supported at the lower end of the rod 4, and 6 is a drive source connected to the crankshaft 5 via a reduction gear, a clutch, a brake, etc. A certain motor, 7
1 is a lower blade provided opposite to the upper blade 1, and 1 to 7 above constitute an example of a cutting section of a mechanical shearing machine.

In conventional shearing machines, the clearance between the blades 1°7 is set in advance according to the thickness of the material, and the ram 2 slides down at a predetermined number of strokes set in the machine, thereby shearing the material. It is designed to perform cutting.

The present invention provides a mechanical shearing machine as described above, in which the stroke speed of the slide 2, that is, the upper blade 1, is slowed down at appropriate intervals while the upper blade 2 is cutting the material, and the upper blade 2 is caused to vibrate, so to speak. It is designed to perform a stroke motion. This point will be explained below.

First, in open loop system control, the stroke operation of the upper blade 1 is controlled by the following configuration.

First, the stroke position of the upper blade I is replaced with the rotation angle of the crankshaft 5 by a rotation angle detector 8 such as an encoder mounted in relation to the crankshaft 5, or the rotation angle of the crankshaft 5 is always detected. The stroke position of the upper blade 1 is directly detected by a length measuring device 81 provided in connection with the blade 2.

On the other hand, the rotation control of the motor 6 is performed by the detector 8 or 81.
During the downward stroke of the upper blade 1 where the stroke position is detected, this is done by giving the motor 6 a speed fluctuation within a minute range, for example, at 10 to 100 cycles per second.

The speed fluctuation cycle and the speed fluctuation width are set in the setting section 9, and the setting section 9 includes the above-mentioned detector 8 or 8.
1 is supplied via its detection processing section 8a, and a pulse signal from an oscillator 10 which generates, for example, 100 pulse signals per second is also supplied.

The signal for controlling the rotation of the motor 6 set in the setting section 9 is the stroke speed during the downward stroke of the upper blade 1 and the crankshaft 5 in order to represent an arbitrary speed pitch at this speed. unit rotation angle or ram 2
(
(hereinafter referred to as setting value) is set.

The setting value set in the setting section 9 is processed by the processing section 11 into a control signal for the drive control section 12 of the motor 6 and supplied to the drive control section I2, so that the motor 6 receives the output of the drive control section 12. In response, it operates according to the set value.

Next, closed-loop system control is implemented by adding the following configuration to the open-loop system described above.

The current rotation angle or current stroke amount pulse signal passed through the detection processing section 8a is made to correspond to the time pulse signal of the oscillator 10 in the current speed detection section 13, so that the stroke speed at the current position of the upper blade 1 is It is detected as a signal expressed in the form of unit rotation angle or stroke amount/time.

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A successive comparison calculation is performed on the schedule change speed set in y m9 and its change pitch.

On the other hand, the pulse signal representing the current position that has passed through the detection processing section 8a is successively compared with the position signal representing the planned speed change pitch in the position calculation section 15.

The calculation results in both calculation units 14 and 15 are supplied to the processing unit 11 as a deviation signal, and the control signal based on the previous set value is corrected.

As a result, when the upper blade 1 performs its stroke operation, the stroke speed set at the planned speed change pitch is increased or decreased, so that the upper blade 1 operates in a so-called oscillatory stroke operation in which the speed is given a speed in the stroke direction. This is what you end up doing.

In a mechanical shearing machine, when cutting, the cutting edge makes a so-called vibratory stroke operation in the minute range mentioned above, which makes it difficult to warp or twist the material to be cut, and improves the roughness of the cut surface. Furthermore, thicker plate materials can be cut even if the output of the drive source is small.

The present invention is as described above, and is extremely useful as a control method for a mechanical shearing machine.

[Brief explanation of drawings]

The figure is a control block diagram showing an example of implementation of the present invention. 1. Upper blade, 2. Ram, 3. Slide guide, 4.
...Connecting rod, 5...Crankshaft, 6.
...Motor, 7.Lower blade, 8.Rotation detector, 9.
Setting section 10... oscillator, ]1... processing section, 12...
・Drive control unit, 13...Current speed detection unit, 14...Speed calculation unit, 15...Position calculation unit representative Yoshikuni Koizumi

Claims (1)

[Claims] When the upper blade is cutting in a mechanical shearing machine, by applying controlled repeated slow and sudden rotation to the rotating shaft that provides stroke movement to the upper blade,
A method for controlling a mechanical shearing machine, comprising causing the upper blade to perform a vibratory stroke operation within an appropriate range.