JPS608160B2 - Press stop control method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of stop control in a press.

Conventional methods for stop control in presses include detecting the rotation speed of the flywheel using the output voltage of a TG (tacho generator) attached to the flywheel of the press, or detecting the number of revolutions of the flywheel by detecting the rotation speed of the flywheel by detecting the rotation speed of the flywheel by using the output voltage of a TG (tacho generator) attached to the press flywheel, or by detecting the rotation speed of the flywheel by detecting the rotation speed of the flywheel by detecting the rotation speed of the flywheel by using the output voltage of a TG (tacho generator) attached to the flywheel of the press, or by detecting the rotation speed of the flywheel by detecting the rotation speed of the flywheel by using the output voltage of a TG (tacho generator) attached to the flywheel of the press By measuring the time it takes to move, the speed of movement of the slide is detected, and from the sliding angle of the slide corresponding to the speed of movement, a rotary cam switch, etc. that operates in conjunction with the crankshaft is used to stop the slide at top dead center. There is a method in which the signal sending angle is set, the press is actually operated, the deviation between the actual stop position angle and the target stop angle, that is, the error in the slip angle is determined, and the rotary cam switch is adjusted again.

However, in the conventional control method, the sending angle of the top dead center stop signal is affected by the movement of the slide, that is, changes in conditions such as the stroke number of the press and the tonnage capacity of the press. There is a problem in that the calculation and setting of the sending angle of the dead center stop signal must be performed every time the above-mentioned conditions change.

In other words, there are problems such as having to manually adjust the rotary cam switch, etc., many times each time the number of strokes etc. changes, which not only significantly reduces the work efficiency of the press, but also makes it difficult to send a stop signal. Calculation, setting, and adjustment of the angle were done by hand, which caused problems such as the inability to accurately stop at top dead center.

Therefore, the present invention is intended to improve the above-mentioned problems of the prior art, and its purpose is to automatically and accurately control the slide to stop at the top dead center even when the stroke number and/or capacity tonnage is different. The purpose of this invention is to provide a press stop control method that allows for

The features of the present invention to achieve this objective are as follows:
A signal sending angle value A for stopping the slide at top dead center when the number of strokes is the lowest, and a signal sending angle value B for stopping the slide at top dead center when the number of slide strokes is the highest are set in the microcomputer. Then, the rotation period tQ at the lowest stroke number and the rotation period t8 at the highest stroke number are determined from the rotation period detection means of the rotating member, and when an arbitrary number of slide strokes is given, the rotation period is detected. Find the rotation period tx at the arbitrary number of strokes from the means, and calculate the signal sending angle value to stop the slide at the top dead center at the arbitrary number of strokes according to the calculation formula X=B+(tzot8) Determine X,
The press stop control method involves controlling the slide to stop at the top dead center by sending out a stop signal at the angle value x according to the position information of the slide position detection means.

Another feature of the present invention is that the slip value ○, which varies depending on the capacity tonnage of the press, the rotation ratio K between the rotating member and the eccentric shaft, and the top dead center position information Z are set in the microcomputer, and the rotation period of the rotating member is set. Determine the rotation period T from the detection means and use the calculation formula
: Z - (St. 0 ÷ K) By correcting the angle value X according to the error 6 between the point position information Z and sending a stop signal at the corrected new angle value It is a press stop control method that performs point stop control.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention, in which reference number 1 indicates a rotating member such as a fly ball of a press, and the rotating part village 1
A dock 3 is provided on the outer periphery of the rotary member 1, and a signal a representing the rotation period of the rotary member 1 is given from the switch 5 in relation to a detection switch 5. Reference numeral 7 denotes an oscillator that provides a reference pulse signal b, and 9 a signal generation circuit that receives the output signal a of the switch 5 and the reference pulse b of the oscillator 7, and generates a count prohibition signal c, a load signal d, and a clear signal e.

The counter 11 counts one rotation period of the rotating member 1 by inputting the reference pulse b of the oscillator 7, the count prohibition signal c and the clear signal e of the signal generating circuit 9. count 11
The count value is latched in the latch 13 according to the load signal d of the signal generating circuit 9. Reference numeral 15 denotes a detection device for detecting the position of the slide, such as a rotary encoder or a linear inductor provided in connection with the eccentric shaft of the press or the reciprocating member.

A microcomputer 17 receives the contents of the latch 13 (the rotation period of the rotating member 1) and the slide position information of the detection device 15.

19 is a keyboard, which will be described later, slide
A top dead center stop signal sending angle value A at the lowest stroke number and a top dead center stop signal sending angle value B at the highest slide stroke number are input.

As will be described in detail later, the microcomputer 17 calculates the rotation period t at the lowest stroke number in each of the above stroke numbers.
Receive Q and the maximum rotation period t8 from the latch 13,
When an arbitrary number of strokes is given, by taking in the rotation period tx at the stroke number from the latch 13, the angle values A, B and the rotation periods tQ, tP,
From x, the signal sending angle value x for stopping the slide at the top dead center at an arbitrary number of strokes is calculated and output. Figure 2 shows one of the rotating parts such as the flywheel of a press.
2 is a timing chart showing the count of rotation periods, and reference symbols in the figure correspond to signals with the same symbols in FIG. 1. FIG. That is, a is a detection signal of the switch 5, b is a reference pulse signal of the oscillator 7, c is a count prohibition signal given to the counter 11 from the signal generation circuit 9, and d is a load signal given to the latch 13 from the signal generation circuit 9. , e are clear signals given to the counter 11 from the signal generating circuit 9. Based on these signals, a counting period as shown in f is determined, and one rotation period of the rotating member 1 is counted. Figures 3a and 3b show the sliding value of the slide at an arbitrary number of strokes x
Fig. 3a is an explanatory diagram for obtaining the calculation formula for the slip value (
Figure 3b shows the relationship between the stroke number (SPM) and one rotation period.
In FIG. 3a, the slip value A indicates the slip value at the lowest stroke number, which corresponds to the signal sending angle value for stopping the slide at the top dead center at the lowest stroke number. Further, the slip value B is the slip value at the maximum stroke number of 8, and corresponds to the signal sending angle value for stopping the slide at the top dead center at the maximum stroke number. The slip value x is the slip value for an arbitrary number of strokes x, so it is clear that this value X corresponds to the signal sending angle value for stopping the slide at the top dead center at an arbitrary number of strokes. On the other hand, tQ' in Fig. 3b is one rotation period of a rotating member (for example, a flywheel of a press) at the lowest stroke number Q, t8 is one rotation period of 8 at the highest stroke number, and tx is one rotation period at a given stroke number. Indicates the rotation period.

As is clear from Figure 3a, B-X 8-X (1) B-A-
Q-8, and as is clear from Figure 3b, tX
-t noon-B-X ■tQ-t8 6
-Q is obtained, so the following equation can be obtained regarding the slip value x at an arbitrary number of strokes.

X=B+(tX-t8) Sakiimo ■ Therefore, it can be seen that in order to stop the slide at the top dead center at a given number of strokes, it is sufficient to send a stop signal at the rotation angle value corresponding to this slip value. .

FIG. 5 shows a flowchart in the case where the top dead center stop control of the slide is performed by implementing the above calculation in the configuration shown in FIG.

The operation shown in FIG. 1 will be explained below based on FIG. 5. The basic operation of FIG. 5 is as follows.

{1} First, the angle value A of the signal sending to stop the slide at the top dead center at the lowest number of slide strokes is set, and the rotational member 1 at the lowest number of strokes is set.
The rotation period tQ of is detected.

{21 Next, set the angle value B for sending the signal to stop the slide at the top dead center at the maximum number of slide strokes, and also set the rotation part village 1 at the maximum number of strokes.
The rotation period t8 of is detected.

{3} Then, from the various parameters obtained in processes '1} and ■ and the rotation period tx of the rotating member 1 at an arbitrary number of strokes, an arbitrary number of strokes is given according to the above-mentioned calculation formula '3}1. The top dead center stop control of the slide is performed by obtaining the top dead center stop signal sending angle value x when the top dead center stop signal is reached.

The above processes '1}, ■, and '31 are sequentially executed after the initial settings shown in step 101 are performed.

In process {1}, first, a rotating member 1 such as a flywheel is driven by a driving electric motor (not shown) so that the number of strokes of the press is the lowest within a variable range, and the number of strokes at the lowest stroke number is Rotation period tQ of rotating member 1
is taken into the microcomputer 17 from the latch 13 (
Step 103), then move to the next step 105. In step 106, it is determined whether the top dead center stop signal sending angle values A and B are set at the minimum and maximum stroke number, but in process [11] this is not set, so the automatic top dead center stop is determined. The process moves to the next judgment step 109 via the function not available (step 107). Step 109
Then, it is determined whether or not the top dead center stop signal sending angle order A is set. Since the angle value A is currently set, the process moves to step 111 and the top dead center stop signal sending angle value A is given. In the next step 113, the angle value A and the rotation period tQ at the lowest stroke number are calculated by the computer 17.
The process moves to the next step 115, where the angle value A is selected as the top dead center stop signal sending angle value. When the angle value A is selected, it is determined in judgment step 117 whether or not the press is starting up, but in this example, only the drive motor of the rotating part village 1 is being driven. Proceeding to the next judgment step 109, it is determined whether or not there is a start command, and the clutch is turned on due to the presence of the start command (step 1211).
The press is started with the lowest number of strokes.

Next, in order to control the top dead center stop of the slide at the lowest stroke number, it is determined whether the position information of the detection device 15 (for example, a rotary encoder or a linear inductor) has reached the above angle value A. This is done in step 123.

When the position information of the detection device 15 reaches the angle value A, a top dead center stop signal is sent, the clutch is turned off (step 125), and the slide is controlled to stop at the top dead center at the lowest stroke number. On the other hand, if the position information of the detection device 15 has not reached the top dead center stop signal sending angle value A, the process is repeated from step 117. Note that if there is no activation command in step 119, the process moves directly to step 125, and the clutch is turned off. As a result of the above process, if the stop position of the press deviates from the top dead center, the top dead center stop signal sending angle value A is adjusted to ensure that the press stops at the lowest stroke number.

When process [1} is completed in this way, next is the top dead center stop signal sending angle value B at the maximum stroke number.
and a process for obtaining the rotation period t8 of the rotating member 1 {
2' is started.

In this process, first, the rotating member 1 is driven by a driving electric motor (not shown) so that the stroke number of the process becomes the highest within a variable range, and the rotation period of the rotating member 1 at the maximum stroke number is t8. (Step 103), and in the same manner as in the above-mentioned process '1}, the process proceeds to Judgment Step 109 via Judgment Step 105 and whether the automatic top dead center stop function is disabled (Step 107), and whether or not the angle value A is set. is judged.

Here, since the angle value A has already been set in the process m, the next process is moved to step 127, where the top dead center stop signal sending angle value B at the maximum stroke number is given. This angle value B is stored in the main memory of the computer 17 together with the rotation period t8 of the rotating member 1 at the maximum stroke number (step 129), and according to steps (117, 119, 121, 123, 125) of the process [1']. The top dead center stop signal sending angle value B of the slide at the maximum stroke number is set. If there is a deviation between the slide stop position according to the angle value B and the top dead center, it goes without saying that accurate adjustment can be made. Since the top dead center stop signal sending angle values A and B at the lowest and highest stroke numbers have been set through the above process, next, when the press is actually operating, that is, the stroke number of the press is set to an arbitrary value. The process used to obtain the top dead center stop signal sending angle value X will be described below.

In process [3', first, when the rotating member 1 is rotationally driven by the driving electric motor corresponding to an arbitrary number of strokes,
The rotation period tx of the rotating member 1 at the given stroke number is read (step 103), and judgment step 10
The automatic top dead center stop function can be used after step 5 (step 133).
), and the process moves to the next step 135.

In step 135, the calculation formula t31X=B+(tX
-t8) According to Sakidai★, A, B, tQ, t3 and tx given in advance
By using , the top dead center stop signal sending angle value x at an arbitrary number of strokes is calculated, and the result is stored in the main memory in the computer 17 (step 137).

After this value is selected in step 139, steps 171, 119, and 121 described in process '1} and ■
, 123, 125), any strike. A stop signal is sent by multiplying the angle value by the number of arcs, and the top dead center stop control of the slide is performed. . As is clear from the above description, according to the above embodiment, it is possible to automatically supply an appropriate top dead center stop point delivery angle value x for an arbitrary number of strokes.

The flowchart of FIG. 6 shows another embodiment of the press stop control method according to the present invention.

The configuration of this embodiment is the same as that shown in FIG. 1, and the counting of one rotation period of a rotating member such as a flywheel of a press is also the same as that shown in FIG. 2. The feature of this embodiment is that the top dead center stop signal sending angle value X at an arbitrary number of strokes is determined by the top dead center stop target value Z, the gear ratio K of the transmission, the slip angle D per stroke, and the 1 of the rotating member 1. According to the rotation period T, the following calculation formula is given.

X; Z- (Saint ÷ K) XD '41 The above calculation formula (2) can be obtained as follows.

If the number of revolutions per second of the rotating member 1, such as a flywheel of a press, is Ns, and the number of revolutions per minute is NM, the following formula holds true.

NM=Ns×60 [51 On the other hand, since the slide of the press is connected by the crankshaft to the rotating part 1 via the transmission and clutch with the gear ratio K, find the number of revolutions per minute NsPM of the above crankshaft. For example, the number of strokes per minute is obtained.

NspM=NN÷K [61[
5) Formula and {6} formula, and the number of revolutions per second Ns is Ns=
Since it is 1/T (T: one rotation period of the rotating member),
The following formula holds true.

N3PM = Saint ÷ K (7) Since the slip angle at any number of strokes is expressed as (NsPM x D) if the slip angle per stroke is D, the top dead center stop signal sending angle at any number of strokes is The value X is expressed by the following formula, where Z is the top dead center stop target value.

X=Z-(NspM×D) ■Therefore, '7}
By substituting the formula into the formula '8}, it becomes:

As is clear from FIG. 7, the above-mentioned slip angle D per stroke varies depending on the tonnage capacity of the press.

That is, when calculating D per stroke for the medium press PM and small press Ps, the slip angle DM per stroke for the medium press PM is DM=450/5Q.
PM=0.9 The slip angle D3 per stroke of the small press Ps is D3=300×5QPM=0.6.

In this way, the slip angle ○ per stroke, which varies depending on the tonnage capacity of the press, is applied to the calculation formula of angle value x [side]. A method for performing top dead center stop control at an arbitrary number of strokes based on the above-mentioned arithmetic expression [4} will be described below with reference to the flowchart of FIG.

First, after various initial settings are made in step 201, the top dead center stop signal sending angle value Z of the slide, the slip angle per stroke ○, and the rotation ratio between the rotating member 1 and the eccentric shaft, that is, the gear ratio of the transmission are determined. K is given via the keyboard 19 (step 203), and in the next step 205, one rotation period T of the rotationally driven rotating member 1 is transmitted from the latch 13 to the microcomputer 17, and the process proceeds to the next step 207. be transferred. In step 207, the calculation formula [4
1. X=Z-(0÷K)

After setting the angle value X, the operator starts the press (step 211).

After starting the press, a slide stop signal is sent when the output value (current position information of the slide) of a detection device 15 such as a rotary encoder or linear inductor coincides with the angle value x. (Step 213)
. After sending the stop signal, the slide stopped after a certain period of time corresponding to the slide stop. The slide position information Y is read (step 215), and the process moves to the next step 217. In step 217, an error 6=Z-Y is calculated between the top dead center stop signal sending angle value Z and the slide stop position information Y based on the above angle value x, and in the next step 219, error 6 is corrected. It is done. Namely, Stetsuf. In step 219, a new top dead center stop signal sending angle value X' after error correction is determined according to the calculation X'=X+8, and this is stored in the memory (step 221).

Memorized new top dead center stop signal sending angle value X
' is determined in step 223 as to whether or not it is appropriate as the final angle value that satisfies the target angle value Z. If it is determined as "OK", in the next step 225 it is determined as the top dead center stop bond sending angle value. The X' is fixed. On the other hand, the angle value X′
If this is not appropriate as the final stop signal sending angle value, the above processing is carried out again from step 211, and the slide stop position target angle value Z is adjusted to be appropriate.
If the top dead center stop signal sending angle value X is determined in this way, it becomes possible to automatically control the top dead center stop of the slide for any number of strokes, and the tonnage capacity of the press can be increased. Even in different cases, it is possible to control the top dead center stop of the slide simply by providing the corresponding parameters.

In each of the embodiments described above, one rotation was used as the standard for measuring the rotation period of the rotating member, but it is not limited to this, and it is also possible to use 1/2, 1/4 rotation, etc. as the standard. It is also possible to measure and use the speed at which the dock attached to the rotating part passes through the switch.

As explained above, according to the present invention, the top dead center stop control of the slide is performed by controlling according to the calculation formula based on predetermined parameters, so even when the stroke number changes and/or the capacity tonnage differs. It is possible to provide a press stop control method that can accurately and automatically control a slide to stop at top dead center.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a timing chart of period counting of the rotating member, Fig. 3a is a relation diagram between the sliding angle of the slide and the number of strokes,
Fig. 3b is a diagram showing the relationship between the number of strokes and the rotation period of the rotating member, Fig. 4 is a flowchart showing an embodiment of the press stop control method according to the present invention, and Fig. 5 is a press stop control method according to the present invention. Flowchart showing another embodiment of
The figure is a diagram showing the relationship between the sliding angle of the slide and the number of strokes, which is related to the tonnage capacity of the press. DESCRIPTION OF SYMBOLS 1... Rotating member, 3... Dock, 5... Switch, 7... Oscillator, 9... Signal generation circuit, 11... Counter, 13... Latch, 15... Detection device, 17.・・・
Microcomputer, 19...Keyboard. Figure 1 Figure 2 Figure 3 (a) Figure 3 (b) Figure 6 Dimensions Figure 5

Claims (1)

[Claims] 1. Using means for detecting the rotation period of a rotating member clutched to a slide of a press, means for detecting the position of the slide, and a microcomputer system, the slide is activated at the lowest number of slide strokes. A signal sending angle value A for stopping the slide at the top dead center and a signal sending angle value B for stopping the slide at the top dead center when the number of slide strokes is the highest are set in the microcomputer, and the rotation period detecting means Rotation period t at the lowest stroke number from
α and the rotation period tβ at the maximum stroke number are determined, and when an arbitrary number of slide strokes is given, the rotation period t_x at the arbitrary number of strokes is determined from the rotation period detection means, and the calculation formula is X=B+ (t_x−t_β)(
(B-A))/((tβ-t_α)) to determine the signal sending angle value X for stopping the slide at the top dead center at the given number of strokes, and according to the position information of the slide position detection means. A press stop control method characterized by controlling a slide to stop at the top dead center by sending a stop signal at an angle value X. 2 Using a means for detecting the rotation period of a rotating member clutched to the slide of a press, a means for detecting the position of the slide, and a microcomputer system, the slip value D, the rotational member and the deviation, which vary depending on the capacity tonnage of the press, is calculated. The rotation ratio K with respect to the core shaft and the target angle value Z for stopping at the top dead center of the slide are set in the microcomputer, the rotation period T is determined from the rotation period detection means, and the calculation formula X=Z-((60)
/T÷K)×D, calculate the angle value X for sending a signal to stop the slide at the top dead center, and calculate the stop position information Y of the slide by the stop signal at the angle value X and the top dead center stop target. By correcting the angle value X according to the error δ between the angle value Z and sending a stop signal at the corrected new angle value A press stop control method characterized by performing stop control.