JPS5841924B2 - Automatic control device for wire drawing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic control device for a wire drawing machine. Specifically, the present invention relates to an automatic control device for a wire drawing machine.
This relates to a device that automatically stops the electric motor of a wire drawing machine and maintains the wire diameter at a constant value when the wire diameter exceeds a specified value or falls outside a set range.

Previously, the wire drawing machine was stopped, the wire diameter was measured with a micrometer or caliper, and the die was replaced if it was outside the specified value.

If it was within the specified value, the method was to turn on the wire drawing machine again and continue the wire drawing work.

Furthermore, even in the conventional method for automatically measuring wire diameter using a magnetic method invented by the present inventors, stopping (controlling) the wire drawing machine was performed manually after checking the wire diameter with a meter.

In the wire drawing process, various points need to be kept in mind, such as proper management of wire drawing dies, reduction of die purchasing costs, and prevention of product yield decline due to wire diameter exceeding specified values. Therefore, it is necessary to accurately know when to replace the dice.

Furthermore, the wire diameter control according to the conventional method was entirely done manually, and there were the following problems.

With the micrometer method, it was necessary to constantly stop the wire drawing machine and repeatedly measure the wire diameter.

- In general wire-drawing factories where several wire-drawing machines are operated by people, or in factories that draw ultra-fine wire at a drawing speed of several 100 meters per minute, it is necessary to use a machine to measure the wire diameter. There is a significant drop in work efficiency due to the stoppage of the wire drawing machine.

Furthermore, even if there is an automatic method for measuring the wire diameter, it is necessary to visually observe the gauges (wire diameter indicator, etc.) in order to immediately stop the wire drawing machine when the wire diameter falls outside of the specified value. There was a need.

An object of the present invention is to provide an automatic control device for a wire drawing machine for improving workability, labor saving, and yield in a wire drawing process.

The present invention will be explained below based on embodiments shown in the drawings.

In the figure, a magnetic mark is placed on a wire 2' discharged from a supply device 1 by a magnetizing head 3.

At this time, the magnetizing device 4 is designed to work in conjunction with a magnetizing device 10, which will be described later.

In the embodiment, the magnetization method is performed by instantaneously interrupting the alternating magnetic field.

・Part of the cutoff signal is a time digital counter (A)
7 is the starting signal.

The magnetic mark point moves, is detected by the detection head 5, and is pulsed and differentiated by the signal processing circuit 6.

This signal becomes a stop signal for the time digital counter (A) 1.

Therefore, the count value at the time digital counter (A) 7 represents the time T1 when the magnetic mark point has passed the distance L.

These measurements are also performed on the wire rod after passing through the wire drawing machine 8 at the same time.

That is, the time digital counter (B) 13 starts at the same time as magnetization is performed by the magnetizing head 9 and the magnetizing device 10 (which is interlocked with the magnetizing device 4).

After passing a distance L, the magnetic mark point is detected by the detection head 11, pulsed and differentiated by the signal processing circuit 12, and becomes a stop signal for the time digital counter (B) 13.

In this way, the magnetic mark moving time T2 of the bending distance of the material behind the wire drawing machine is determined.

The wire diameter D2 after wire drawing is determined from the above T1 and T2 using the following formula.

However, Dl is the wire diameter before the wire drawing machine.

T1 and T2 are digital-to-analog converters 14° and 15, respectively.
After converting it into an analog signal, the arithmetic unit 16 calculates the above equation (1).

This value is displayed on the display 17.

When the wire diameter during wire drawing is thus converted into an electrical signal, control is performed as follows.

The signal from the arithmetic unit 16 is converted into an analog signal by a digital-to-analog converter 18 and guided to a comparator 19.

The comparator 19 is designed to generate a voltage proportional to a given wire diameter, and when the output of the converter 18 is outside the set range, the relay 20 is automatically activated, the electromagnetic switch 22 is activated, and the wire drawing machine is activated. The electric motor 21 stops and the wire drawing machine stops.

23 is an alarm, and 24 is a winding device of the wire drawing machine.

According to the present invention, when the wire diameter falls outside the set range due to die wear during wire drawing, it is now possible to automatically stop the wire drawing machine immediately.

This can be expected to save labor in wire drawing work and improve work efficiency, yield, quality, etc.

In the case of measurement using a micrometer or the magnetic mark method conventionally devised by the inventors, visual observation of the display is required, and the number of wire drawing machines that can be handled by humans is limited.

However, in the present invention, the diameter of the wire drawing material can be automatically maintained at an arbitrary value, which increases the number of wire drawing machines that can be handled by humans.
Labor saving can be achieved.

Additionally, in the conventional method, if the wire diameter deviated from the specified value, a person would go to the cab of the wire drawing machine and turn off the wire drawing machine.

In high-speed wire drawing, the distance is at least several 100 m or several 1
The diameter of the 000 m wire rod deviated from the specified value, resulting in a decrease in yield.

In contrast, in the present invention, the wire drawing machine automatically stops as soon as the wire diameter deviates from the specified value, so it is possible to improve the yield of products.

Furthermore, when comparing the workability with the conventional method of measuring the wire diameter with a micrometer, the conventional method requires stopping the wire drawing machine each time to measure the wire diameter, and it takes several minutes for each measurement.

Furthermore, as the wire diameter becomes smaller, measurement errors also occur.

Compared to this, the present invention is superior in that it can improve work efficiency and prevent quality deterioration caused by measurement errors because it is entirely automatically controlled.

[Brief explanation of drawings]

The figure is a schematic diagram showing an embodiment according to the invention. 1: Material supply device, 2: Material, 3, 9: Magnetizing head, 4
, 10: Magnetizing device, 5, 11: Detection head, 6, 12:
Signal processing circuit, 7, 13: Time digital counter,
8: Wire drawing machine, 14, 15° 18: Digital-to-analog converter, 16: Arithmetic unit, 17: Display, 19: Comparator, 20
: Electromagnetic relay, 21: Electromagnetic switch, 22: Electric motor for wire drawing machine, 23: Alarm, 24: Winding device, 31, 32: Detector, 33: Stopping device.

Claims (1)

[Claims] 1. A magnetizing head disposed on the material supply device side, a detection head disposed apart from the magnetization head on the material winding device side, and pulses and differential signals from the detection head. 2. A converter that includes a signal processing device and a time digital counter that counts the passage time of the material, and that is arranged before and after the wire drawing machine, and that converts the signal from the detector into an electrical signal; a computing unit that computes signals from two converters; a comparator that compares the signal from the computing unit with a set value; and a stop device that stops the wire drawing machine based on the signal from the comparator. An automatic control device for a wire drawing machine featuring: