JPH04123813A - Circuit for detecting dies wear of multistage wire drawing machine line - Google Patents

Abstract

PURPOSE:To recognize the wear limit for all dies and to improve the line working rate by judging the output value of each position adjuster for dancer rolls set between plural wire drawing machines arranged in series. CONSTITUTION:Even if a diameter D3 of a wire after wire drawing is larger than the prescribed value because a die 31 is worn away, this wire rod running speed after drawing is not changed because the target value of the wire rod running speed V3 is set by a speed setting device 3. Therefore, from the relation of the equation V2X(D2)<2>=V3X(D3)<2>, the output of the position adjusting device 53 is changed so as to increase the speed V2. And if a die 21 is worn, the diameter of wire D2 after drawing is enlarged for the same reason above, the output of the position adjusting device is changed so as to make the speed V2 low. Therefore, if it is detected that the output of the position adjusting device 53 to be inputted to the 1st output detector 54 exceeds a prescribed range being set with zero as the center, it can be detected that either the dies 31 or the dies 21 has worn. In the same way, the 1st output detecting device 44 can detect either wear of the dies 21 or the dies 11.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention comprises a plurality of wire drawing machines arranged in series and a dancer roll installed between each of these wire drawing machines. This invention relates to a circuit for detecting die wear in a multi-stage wire drawing machine line.

[Conventional technology]

FIG. 6 is a circuit diagram showing a conventional example of a multistage wire drawing machine line, in which three sets of wire drawing machines are arranged in series, and two sets of dancer rolls are installed between each wire drawing machine. It shows the case.

In FIG. 6, the wire rod 2 to be drawn runs in the direction of the arrow from the left side to the right side. Therefore, the left end is No. 1 wire drawing machine,
The center is named the No. 2 wire drawing machine, and the right end is named the No. 3 wire drawing machine. Also, the one between the No. 1 wire drawing machine and the No. 2 wire drawing machine is called the No. 1 dancer roll, and the one between the No. 2 wire drawing machine and the No. 3 wire drawing machine is called the No. 2 dancer roll. Rir.

Three sets of wire drawing machines each have a die IL for drawing wire rod 2.
2], 31, a hook 12, 22, 32 that pulls the wire passed through this die, a wire drawing motor 13, 23, 33 that drives this hook, and a speed generator that detects the rotational speed of the wire drawing motor. 14.24.34 and a control circuit 15.25.35 for controlling the O/wire drawing motor.

Two sets of dancer rolls also include a dancer roll 41.51 and a position transmitter 42.51 for detecting the position of the dancer roll.
52 and a position adjuster 4 for adjusting the position of the dancer roll.
3.53.

The running speed of wire rod 2 entering the No. 1 wire drawing machine is ■.

Diameter of wire rod 2. Then, as the wire is drawn by the die 11, the diameter of the wire decreases to , but the running speed increases to 1 in response to this decrease in diameter.

Further, by drawing with die 21, the wire rod diameter decreases to D2, and the wire rod speed increases to ■2, and by drawing with die 31, the diameter of wire rod 2 running from No. 3 wire drawing machine 1 and its speed. becomes ■3.

As mentioned above, in the multi-stage wire drawing machine line, the operating speeds of each wire drawing machine are different, so these speeds are controlled as follows. That is, the speed target value N'' of the final stage (i.e., No. 3) wire drawing machine is set by the speed setting device 3, and is applied to the control circuit 35 via the acceleration/deceleration calculator 4. The actual speed value is also manually determined, and the wire drawing motor 33 is controlled in order to make this actual speed value match the speed target value N''.

The No. 2 wire drawing machine and the No. 1 wire drawing machine also perform speed control similar to the above, but since the cross-sectional area of the wire rod 2 is different before and after the die 31, the wire rod running speed before passing through the die 31 is The wire running speed (2) after passing through the die 31 is slower than (3), and the ratio corresponds to the square of the wire diameter, that is, the area reduction rate. Therefore, the speed target value given to the wire drawing motor 12 of the No. 2 wire drawing machine is a value obtained by multiplying the aforementioned N9 by the area reduction rate of the wire drawing machine.

The area reduction rate setter 28 sets the above-mentioned liquid level rate to 2, and the multiplier 27 calculates the product of the speed target value N" of the No. 3 wire drawing machine and this area reduction rate by 2. Here, The liquid level ratio of 2 is the value shown in equation (1).

By the way, the No. 2 wire drawing machine installed between the No. 2 wire drawing machine and the No. 3 wire drawing machine
When the speed control of the redrawing machine is not appropriate, the position of the dancer roll 51 moves up and down to absorb this speed difference, and the position transmitter 52 and position adjuster 53 absorb this speed difference. A control signal is issued to correct the problem. That is, when the speed of the re-drawing machine is appropriate, the dancer roll 5
1 is in the normal position, and the output of the position adjuster 53 is zero. However, for example, if the speed of the No. 2 wire drawing machine is slower than the No. 3 wire drawing machine, the position of the dancer roll 51 will move upward, and the position adjuster 53 will send a positive control signal corresponding to this movement amount. Output. Conversely, if the speed of the No. 2 wire drawing machine is faster, the position of the dancer roll 51 moves downward, and the position adjuster 53 outputs a control signal of negative polarity corresponding to this movement amount. do.

The adder 26 adds the positive or negative control signal output by the position adjuster 53 and the speed target value obtained by multiplying the area reduction rate by 2, and adds the result to the No. 2 wire drawing motor 23. It is input to the control circuit 25 as a speed target value, and control is performed to make the actual speed value from the speed generator 24 coincide with this speed target value.

Similarly, in the No. 1 wire drawing machine, the multiplier 17 multiplies the area reduction rate set by the area reduction rate setter 18 by 1 and the aforementioned speed target value N1, and the adder 16 uses this multiplication result, It is added to the positive or negative control signal output by the position adjuster 43, and the addition result is input to the control circuit 15 as a speed target value to appropriately control the wire running speed of the No. 1 wire drawing machine. Note that the liquid level ratio is expressed by the following equation (2).

[Problem to be solved by the invention] By the way, the die used in the 2J wire drawing machine is
As the wire 2 is drawn, it will gradually wear out and the diameter of the drawn wire will gradually increase, so measure the diameter of the drawn wire H or the diameter of the hole in the die, and determine that value as the allowable limit. If so, replace the dice.

However, such measurements must be performed after the multi-stage wire drawing machine line has stopped operating, which not only lowers the operating rate of the equipment, but also increases the time and effort required for measurement and the time required to stop the multi-stage wire drawing machine line. There are inconveniences such as the need for effort when starting up, and the loss of product during stopping and during the period from starting to stabilizing operation, resulting in a large amount of loss.

Therefore, normally, the dies are replaced all at once after drawing the wire rod 2 on a multistage wire drawing machine line for a certain period of time, but the degree of wear of the dies depends on the material of the wire rod 2 and the time during which the wire was drawn. Since the temperature varies greatly depending on the temperature, if the dies are replaced all at once based on the above-mentioned preventive maintenance concept, there will be an inconvenience that even dies that are only slightly worn will be replaced.

Therefore, an object of the present invention is to detect which die has reached its wear limit even when a multi-stage wire drawing machine line is in operation.

[Means to solve the problem]

In order to achieve the above object, the die wear detection circuit of the present invention includes a die for drawing a wire, a hook for drawing the wire passed through the die, and a control means for matching an actual speed value with a target speed value. A plurality of sets of wire drawing machines are arranged in series, and a dancer roll, which is equipped with a position adjustment means and responds to the speed difference of the wire rod, is arranged between each of the wire drawing machines. In a multi-stage wire drawing machine line that is arranged and configured, for wire drawing machines other than the final stage, multiply the speed target value of the final stage wire drawing machine by the area reduction rate of the die, and add this multiplication result to the wire drawing machine In a multi-stage wire drawing machine line configured to add the output of the position adjustment means of the dancer roll that follows and operate with this addition result as the speed target value of the wire drawing machine, the output of the position adjustment means of the dancer roll is set to a predetermined value. Either a first output detection means is provided for detecting that the output of the dancer roll position adjustment means has exceeded a predetermined range, or a second output detection means is provided for detecting that the output of the dancer roll position adjustment means has exceeded a predetermined range together with the output polarity; or a means for setting a total area reduction rate that is a ratio of the cross-sectional area of the wire rod entering the first-stage wire drawing machine and the cross-sectional area of the wire rod running out from the final-stage wire drawing machine; a first multiplication means for multiplying by a speed target value for the wire drawing machine; a means for detecting the running speed of the wire rod entering the first stage wire drawing machine; and a calculation by the first multiplication means from the running speed of the wire rod entering the first stage wire drawing machine. A first subtraction means for subtracting the result and a third output detection means for detecting that the calculation result of the first subtraction means exceeds a predetermined value, or all the outputs of each dancer roll position adjustment means are summed. a first addition means for subtracting the calculation result of the first addition means from the calculation result of the first subtraction means; and detecting that the calculation result of the second subtraction means exceeds a predetermined value. or a combination of the first output detecting means, the second output detecting means, the third output detecting means, and the fourth output detecting means.

[Effect]

In a multi-stage wire drawing machine line in which a plurality of wire drawing machines are arranged in series and dancer rolls are installed between each wire drawing machine, the position adjuster output of a specific dancer roll is Outputting a value other than zero means that the speed difference between the front and rear wire drawing machine dies of this particular dancer roll is being corrected due to wear, and the position adjuster output is within the specified range. If it exceeds , the first output detection means warns of die wear of the wire drawing machine before or after the particular dancer roll belonging to it.

Also, if the position adjuster output is positive and exceeds the predetermined range, this means that the die of the wire drawing machine following the specific dancer roll is worn out; conversely, the position adjuster output is negative polarity. If it exceeds a predetermined range, this means that the die of the wire drawing machine located in front of the specific dancer roll has worn out, so the second output detection means detects whether the die of any wire drawing machine has worn out. detects and issues an alarm.

If each die wears out uniformly, it cannot be detected by the above-mentioned first output detection means or second output detection means, but the area reduction rate of the entire multistage wire drawing machine line is multiplied by the speed target value of the final stage wire drawing machine. By doing this, the target value of the running speed of the wire rod entering the multi-stage wire drawing machine line is calculated, and the difference between this target value and the actual value of the wire rod running speed on the multi-stage wire drawing machine line is calculated, and this difference is determined as a predetermined value. In this case, the third output detector detects that each die is worn uniformly and issues an alarm.

In addition, from the difference between the actual running speed of the wire rod entering the two-stage multi-stage wire drawing machine line number and the running speed target value, the sum of the outputs of each dancer roll position adjuster is calculated, and this value is calculated. When the value exceeds a predetermined value, the fourth output detector is operated to issue an alarm.

Furthermore, these first output detector, second output detector, third output detector,
By using either the output detector or the fourth output detector in combination, die wear can be detected reliably.

〔Example〕

FIG. 1 is a circuit diagram showing the first embodiment of the present invention, and the configuration of the multistage wire drawing machine line shown in this first embodiment is as follows:
This is the same as the case of the conventional example circuit already described in FIG. Therefore, the wire rod 2, speed setting device 3,
Acceleration/deceleration calculator 4, die 1121.31, hook 12.2
2.32, wire drawing motor 13゜23, 33, speed generator 1
4.24.34, control circuit 15.2535, adder 16
．． 26, Multiplier], 7.27, Area reduction rate setter 18, 28
, the dancer roll 41.51, the position transmitter 42.52, and the position adjuster 43.53 have the same names, uses, and functions as those in the conventional circuit shown in FIG. 6, and therefore their explanations will be omitted.

In the first embodiment circuit, a first output detector 44 detects that the output of the position adjuster 43 exceeds a predetermined range, and a first output detector 44 detects that the output of the position adjuster 53 exceeds a predetermined range. An output detector 54 is installed.

The running speed ■2 of the wire rod 2 running from the No. 2 wire drawing machine and the running speed ■3 of the wire rod 2 running from the No. 3 wire drawing machine are the wire diameter D2 after drawing with the die 21 and the wire diameter D2 after drawing with the die 31 If the wire diameter D3 after wire drawing is properly controlled, including the correction, the dancer roll 51 of the No. 2 dancer roll is in the proper position, and therefore the output of the position adjuster 53 is zero, and at this time. The wire running speed and the wire diameter have a relationship shown in equation (3).

■2・(D2)2-V3・(D3) 2------
−−−−−−−−− (3) Even if the die 31 is worn and the wire diameter D3 after wire drawing is larger than the predetermined value, the target value of the wire rod running speed after wire drawing It is set by the speed setting device 3 and remains unchanged. Therefore, from the relationship in equation (3), the speed ■
The output of the position adjuster 53 changes so as to increase the value of 2.

Further, when the die 21 is worn out and the wire diameter 1]2 after drawing becomes large, the output of the position adjuster 53 is changed to reduce the speed 2 for the same reason as described above.

Therefore, the position adjuster 53 input to the first output detector 54
If it is detected that the output exceeds a predetermined range set around zero, it can be detected that either die 3I or die 21 has worn out. Similarly, the first output detector 44 can detect wear of either the die 21 or the die 11.

FIG. 2 is a circuit diagram showing a second embodiment of the present invention.

In the second embodiment circuit, a second output detector 55 detects that the output of the position adjuster 53 is positive and exceeds a predetermined value.
and a second output detector 56 that detects that the output of the position adjuster 43 has a negative polarity and exceeds a predetermined value, and a second output detector 45 that detects that the output of the position adjuster 43 has a positive polarity and exceeds a predetermined value. ,
The circuit differs from the first embodiment circuit described above in that it includes a second output detector 46 that detects that the negative polarity exceeds a predetermined value, and the other circuit configurations and each component are different. Since the name, purpose, and function are the same as those of the first embodiment circuit shown in FIG. 1, a description thereof will be omitted.

In the second embodiment circuit, when the output of the position adjuster 53 is positive and exceeds a predetermined value, it means that the die 31 is worn out, and the second output detector 55 detects this. Further, if the output of the position adjuster 53 is negative and becomes less than a predetermined value, it means that the die 21 is worn out, and the second output detector 56
detects this. Similarly, the second output detector 45 detects the wear of the dice 21 and the second output detector 46 detects the wear of the dice 11 from the output value of the position adjuster 43 and its polarity.

FIG. 3 is a circuit diagram showing the third embodiment of the present invention, and the configuration of the multistage wire drawing machine line shown in this third embodiment is as follows:
This is the same as the case of the conventional example circuit already described in FIG. Therefore, in this third embodiment circuit, the wire 2, the speed setting device 3,
Acceleration/deceleration calculator 4, die IL 21.31, hook 12.
22.32, wire drawing motor 1323.33, speed generator 1
4.24.34, Control circuit 15.25°35, Adder 1
6.26, multiplier 17.27, area reduction rate setter 18, 28
, the dancer roll 4L 51, the position transmitter 42.52, and the position adjuster 43.53 are also the same in name, purpose, and function as those in the conventional circuit shown in FIG. 6, so their explanations will be omitted.

In the third embodiment circuit, a wire rod speed detector 61 detects the traveling speed of the wire rod 2 entering the No. 1 wire drawing machine, which is the first stage.
will be established. Also, the area reduction rate K of the wire rod 2 of the entire multistage wire drawing machine line. A total area reduction rate setting device 62 for setting the total area reduction rate, and a first multiplier 63 for multiplying the speed target value N'' output from the acceleration/deceleration calculator 4 by 0 are provided. The wire diameter of the wire rod 2 entering the wire machine, that is, the No. 1 wire drawing machine, is D.
o, since the wire diameter of the wire 2 running from the final stage wire drawing machine, that is, the No. 3 wire drawing machine, is D3, the total area reduction rate of 0 is (4
) is the value shown in the formula.

Therefore, the wire rod speed detector 61 detects the actual speed value of the wire rod 2 entering the multistage wire drawing machine line, and the first multiplier 63
The output of will give the speed target value of the incoming wire rod 2.

Therefore, the first subtractor 64 calculates the difference between the actual speed value and the target speed value of the incoming wire, and this calculation result is greater than or equal to the predetermined value for all dies (third embodiment circuit). This means that the total amount of wear on the dies IL 21 and 31) is large, and the third output detector 65 detects this and issues an alarm.

FIG. 4 is a circuit diagram showing a fourth embodiment of the present invention.

This fourth embodiment circuit includes a first adder 66 for summing the outputs of the position adjusters 43 and 53 in addition to the third embodiment circuit described above.
A second subtracter 67 calculates the difference between the output of the first subtracter 64 and the output of the first adder 66, and an alarm is issued by detecting that the output of the second subtracter 67 is equal to or higher than a predetermined value. Although a fourth output detector 68 for emitting light is added, all the parts other than this added part are the same as the circuit of the third embodiment shown in FIG. 3, so a description thereof will be omitted.

In this fourth embodiment circuit, an abnormal value is detected by comparing the wear of the die of the first-stage wire drawing machine, that is, the die 11, and an alarm is issued.

FIG. 5 is a circuit diagram showing a circuit according to a fifth embodiment of the present invention, which is an arbitrary combination of some of the four embodiment circuits described above. is composed of a combination of the first, third and fourth embodiment circuits.

〔Effect of the invention〕

In a multistage wire drawing machine line configured by arranging a plurality of wire drawing machines in series and providing dancer rolls between each wire drawing machine, claim 1 of the present invention provides that the output of the position adjuster of the dancer rolls is within a predetermined range. From this fact, it can be detected that the dies of the wire drawing machine before or after the dancer roll are worn out. You can identify which one is worn out. Furthermore, in claim 3, even if all the dies wear uniformly and die wear cannot be detected by the output of the dancer roll position adjuster, it is detected that the total amount of wear of all dies exceeds a predetermined value. According to claim 4, abnormal wear can be detected compared to the wear of the die of the first-stage wire drawing machine. Furthermore, in claim 5, these wear detection patterns can be combined to detect any wear state.

Each of the die wear detection circuits of the present invention described above can determine which die wear has reached its limit during the operation of a multistage wire drawing machine line, and therefore can reduce the operating rate of the multistage wire drawing machine line. It can be improved, and it also has the effect of avoiding the waste of exchanging dice all at once.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing the first embodiment of the present invention;
The figure is a circuit diagram showing the second embodiment of the invention, FIG. 3 is a circuit diagram showing the third embodiment of the invention, FIG. 4 is a circuit diagram showing the fourth embodiment of the invention, and FIG. FIG. 5 is a circuit diagram showing a fifth embodiment of the present invention, and FIG. 6 is a circuit diagram showing a conventional example of a multistage wire drawing machine line.

Claims (1)

[Scope of Claims] 1) A wire drawing device comprising a die for drawing a wire rod, a hook for pulling the wire passed through the die, and a control means for matching an actual speed value with a target speed value for driving the hook. A multi-stage wire drawing machine line consisting of multiple sets of wire drawing machines with motors arranged in series, and dancer rolls equipped with position adjustment means that respond to the speed difference of the wire rods arranged between each wire drawing machine. Then, for wire drawing machines other than the final stage, the speed target value of the final stage wire drawing machine is multiplied by the area reduction rate of the die, and this multiplication result is used as the output of the position adjustment means for the dancer roll following the wire drawing machine. In a multi-stage wire drawing machine line configured to add up and operate the wire drawing machine using the addition result as a speed target value of the wire drawing machine, a first step detecting that the output of the position adjustment means of the dancer roll exceeds a predetermined range. A die wear detection circuit for a multistage wire drawing machine line, characterized by comprising an output detection means. 2) Wire drawing consisting of a die for drawing a wire rod, a hook for pulling the wire passed through the die, and a wire drawing motor that drives the hook and is equipped with a control means for making the actual speed value match the target speed value. A multi-stage wire drawing machine line consisting of multiple sets of wire drawing machines arranged in series, and dancer rolls equipped with position adjustment means that respond to the speed difference of the wire rod between each machine. The wire drawing machine multiplies the speed target value of the final stage wire drawing machine by the area reduction rate of the die, adds the position adjustment means output of the dancer roll following the wire drawing machine to this multiplication result, and calculates the result of this addition. In a multi-stage wire drawing machine line configured to operate with the result as a speed target value of the wire drawing machine, a second output detects that the output of the dancer roll position adjustment means exceeds a predetermined range, together with the output polarity. A die wear detection circuit for a multistage wire drawing machine line, characterized by comprising a detection means. 3) Wire drawing consisting of a die for drawing a wire rod, a hook for pulling the wire passed through the die, and a wire drawing motor that drives the hook and is equipped with a control means for matching the actual speed value to the target speed value. A multi-stage wire drawing machine line consisting of multiple sets of wire drawing machines arranged in series, and dancer rolls equipped with position adjustment means that respond to the speed difference of the wire rod between each machine. The wire drawing machine multiplies the speed target value of the final stage wire drawing machine by the area reduction rate of the die, adds the position adjustment means output of the dancer roll following the wire drawing machine to this multiplication result, and calculates the result of this addition. In a multi-stage wire drawing machine line configured to operate with the speed target value of the wire drawing machine in question, the cross-sectional area of the wire rod entering the first stage wire drawing machine and the cross-sectional area of the wire rod running from the final stage wire drawing machine are a total area reduction rate setting means for setting a total area reduction rate which is a ratio; a first multiplication means for multiplying the total area reduction rate by a speed target value of the final stage wire drawing machine; a wire rod speed detection means for detecting the running speed of the wire rod entering the wire; a first subtraction means for subtracting the calculation result of the first multiplication means from the wire rod running speed detected by the wire rod speed detection means; A die wear detection circuit for a multi-stage wire drawing machine line, comprising a third output detection means for detecting that a calculation result exceeds a predetermined value. 4) Wire drawing consisting of a die for drawing a wire rod, a hook for pulling the wire passed through the die, and a wire drawing motor that drives the hook and is equipped with a control means for matching the actual speed value to the target speed value. A multi-stage wire drawing machine line consisting of multiple sets of wire drawing machines arranged in series, and dancer rolls equipped with position adjustment means that respond to the speed difference of the wire rod between each machine. The wire drawing machine multiplies the speed target value of the final stage wire drawing machine by the area reduction rate of the die, adds the position adjustment means output of the dancer roll following the wire drawing machine to this multiplication result, and calculates the result of this addition. In a multi-stage wire drawing machine line configured to operate with the speed target value of the wire drawing machine in question, the cross-sectional area of the wire rod entering the first stage wire drawing machine and the cross-sectional area of the wire rod running from the final stage wire drawing machine are a total area reduction rate setting means for setting a total area reduction rate which is a ratio; a first multiplication means for multiplying the total area reduction rate by a speed target value of the final stage wire drawing machine; a wire rod speed detection means for detecting the running speed of the wire rod entering the wire rod; a first subtraction means for subtracting the calculation result of the first multiplication means from the wire rod running speed detected by the wire rod speed detection means; and a position adjustment of each of the dancer rolls. a first addition means for summing all the outputs of the means; a second subtraction means for subtracting the calculation result of the first addition means from the calculation result of the first subtraction means; and a calculation result of the second subtraction means. A die wear detection circuit for a multi-stage wire drawing machine line, comprising a fourth output detection means for detecting that a predetermined value has been exceeded. 5) Wire drawing consisting of a die for drawing the wire, a hook for pulling the wire passed through the die, and a wire drawing motor that drives the hook and is equipped with a control means for matching the actual speed value to the target speed value. A multi-stage wire drawing machine line consisting of multiple sets of wire drawing machines arranged in series, and dancer rolls equipped with position adjustment means that respond to the speed difference of the wire rod between each machine. The wire drawing machine multiplies the speed target value of the final stage wire drawing machine by the area reduction rate of the die, adds the position adjustment means output of the dancer roll following the wire drawing machine to this multiplication result, and calculates the result of this addition. In a multi-stage wire drawing machine line configured to operate with the result set as a speed target value of the wire drawing machine, the first wire drawing machine line according to claim 1
It is characterized by comprising any one of the output detection means, the second output detection means according to claim 2, the third output detection means according to claim 3, or the fourth output detection means according to claim 4. A die wear detection circuit for a multi-stage wire drawing machine line.