JPH0355247B2 - - Google Patents

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, various methods are used, such as making it possible to adjust the clearance between the upper and lower blades, and adjusting the amount of forward inclination and rake angle. A method is being adopted.

However, there are limits to conventional clearance adjustment and rake angle adjustment 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 enables cutting with a smaller drive source output than the conventional cutting capacity (plate thickness). ) This was done with the purpose of presenting a control method for a mechanical shearing machine that is capable of cutting the above materials, and its configuration is such that when the upper blade of the mechanical shearing machine is cutting It is characterized in that the upper blade is caused to perform an oscillatory stroke action within an appropriate range by applying controlled repeated slow and sudden rotation to a rotating shaft that provides a stroke action to the blade.

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. a connecting rod 5 connected to the rod 4; a full eccentric crankshaft 6 pivotally supported at the lower end of the rod 4;
A motor 7 is a driving source connected to the crankshaft 5 via a reducer, a clutch, a brake, etc.
is a lower blade provided opposite to the upper blade 1, and the above 1 to 1 are
7 constitutes an example of a cutting section of a mechanical shearing machine.

In conventional shearing machines, the clearance between the blades 1 and 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 now possible 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 adjusted at appropriate intervals while the upper blade 2 is cutting the material, so that the upper blade 2 is vibrated. It is designed to perform a typical 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 1 is replaced with the rotation angle of the crankshaft 5 by a rotation angle detector 8 such as an encoder attached to the crankshaft 5, or the rotation angle of the crankshaft 5 is constantly 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 such that during the downward stroke of the upper blade 1 whose stroke position is detected by the detector 8 or 81, the motor 6 is rotated, for example, per second.
This is done by applying speed fluctuations in a minute range over 10 to 100 cycles.

The speed fluctuation cycle and the speed fluctuation range are set in the setting section 9, and the setting section 9 is supplied with a pulse signal from the detector 8 or 81 via its detection processing section 8a. For example, 1
Oscillator 10 generating 100 pulse signals per second
A pulse signal from 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 to represent an arbitrary pitch at this speed.
unit rotation angle or unit stroke amount of ram 2,
It is set with a signal (hereinafter referred to as a set value) representing an increase or decrease in the rotation speed of the crankshaft 5 or the downward stroke speed of the ram 2 for each unit rotation angle or unit stroke amount.

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 12.
The motor 6 receives the output from the drive control section 12 and 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 passing through the detection processing section 8a is sent to the current speed detection section 1.
3, the stroke speed at the current position of the upper blade 1 is made to correspond to the time pulse signal of the oscillator 10, and 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.

The current speed is successively compared in the speed calculation section 14 with the scheduled change speed set in the setting section 9 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 scheduled speed change pitch in the position calculation section 15.

The calculation results in both calculation units 14 and 15 are supplied as a deviation signal to the processing unit 11, 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 scheduled speed change pitch is increased or decreased, so that the upper blade 1 performs a so-called vibrating stroke operation in which the speed is given a speed in the stroke direction. This is what you end up doing.

When cutting with a mechanical shearing machine, when the cutting blade makes a so-called vibrating stroke in the minute range mentioned above, the material being cut is less likely to warp or twist, and it also achieves a good cutting surface roughness. Furthermore, thicker plate materials can be cut even if the output of the drive source is small.

As described above, the present invention 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, 11 ...
Processing unit, 12...Drive control unit, 13...Current speed detection unit, 14...Speed calculation unit, 15...Position calculation unit.

Claims (1)

[Claims] 1. When the upper blade is performing a cutting operation in a mechanical shearing machine, the upper blade is given a vibratory stroke within an appropriate range by applying controlled repeated slow and sudden rotation to the rotating shaft that provides stroke operation to the upper blade. A method for controlling a mechanical shearing machine, characterized by operating the mechanical shearing machine.