JPH0729224B2 - Advance correction method and advance correction device for press - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for correcting an advance angle of a press driven by a press shaft that rotates at a non-constant speed during one cycle, and an apparatus thereof.

[Prior Art] In a press, smooth operation without interference is performed by restricting the operation of the press constituent devices and peripheral devices by the rotation angle of the press shaft.

Therefore, the press configuration device and peripheral devices (hereinafter,
It is tentatively called a controlled object. ) Is the start angle of the start operation,
The time point when the completion operation is started is set as a cutting angle and set in advance for each control target.

Then, during the actual press operation, a control signal for starting and completing the controlled object is output each time the rotation angle of the press shaft reaches the set input angle and the set cut angle.

An electronic rotary cam switch, which replaces the mechanical rotary cam switch, is widely used as a means for executing the setting of the entry angle and the turning angle and the output of the control signal. This is because it has advantages such as high-speed processing of multiple points and easy setting change.

By the way, each controlled object has a delay time from the input of the control signal to the actual end of the start operation / end operation as a unique value. Furthermore, the rotational speed of the press shaft, that is, the number of strokes per minute (SPM)
In general, when is intermittent, it can be continuously switched.

Therefore, when setting the above-mentioned on / off angle by the electronic rotary cam switch, it is necessary to correct the advance angle for each set SPM and by the delay time of each controlled object. However, it is troublesome to perform this advance angle correction while obtaining the advance angle by the operator's manual calculation or the like. Therefore, a means for setting the entry angle and the turning angle, a means for setting the advance angle correction data such as the SPM and the delay time, and a means for advancing the entry angle and the turning angle set based on the advance angle correction data are provided. Advance angle correction is performed by automatic calculation. For example,
57-137099 can be mentioned.

[Problems to be Solved by the Invention] However, the lead angle correction method and device by the above-described automatic calculation are based on the premise that the rotation of the press shaft in the set SPM rotates at a constant speed during one cycle. Therefore, it cannot be applied to a press in which the rotation speed during one cycle is unequal speed, and its attempt has been abandoned due to the unequal speed complexity.

However, in response to the current demand for diversification, for example, reduction processing with fast return characteristics, improvement of productivity by shortening cycle time, improvement of drawing ability with a constant punch speed, or cold forging with constant processing speed characteristics. As presses such as so-called link presses, which are suitable for carrying out the above-mentioned, in which the press shaft rotates at a non-constant speed during one cycle have become more widespread, even in such a non-constant speed rotary press, the same rapid and accurate movement as the constant-speed rotary press can be performed. There is an increasing demand for development that requires angle correction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a press advance angle correction method and an advance angle correction device capable of performing accurate and quick advance angle correction even in a press in which the press shaft rotates at a non-uniform speed during one cycle.

[Means for Solving the Problems] According to the invention described in claim 1, the rotation axis of the link motion press is regarded as an inconstant velocity system, and in this inconstant velocity system, there is no direct advance correction processing, and the like. This is a method of correcting the advance angle by utilizing the speed system. Therefore, the angle in the non-constant speed system at which the controlled object completes its operation is converted into the angle in the constant speed system based on the prepared conversion data. Next, the angle of this constant velocity system is corrected by the advance angle correction data based on the constant velocity system to obtain the corrected advance angle in the constant velocity system. Then, the corrected advance angle in this constant velocity system is obtained from the above conversion data. A control signal for the controlled object is output at the corrected advance angle in this non-uniform speed system.

According to the second aspect of the present invention, the rotation axis of the link motion press is regarded as a non-constant speed system, and the advance angle correction is performed by using the constant speed system without directly performing the advance angle correction process in the non-constant speed system. It is a device that does. Therefore, angle setting means for setting the set angle, that is, the crank angle of the drive shaft of the press, which is a non-uniform speed system when the operation of the controlled object is completed, is provided, and the advance angle correction data for each controlled object is set. An angle correction data setting means is provided, and a memory for storing conversion data in which an angle in the non-constant speed system is associated with an angle in the non-constant speed system is provided. Forward conversion means for converting the angle in the constant velocity system using the conversion data is provided, and advance angle correction means for advancing the set angle in the constant velocity system by the time lag is provided. Inverse conversion means is provided for converting the corresponding corrected advance angle obtained in step 1 into the angle of the non-constant speed system using the conversion data.

[Operation] When the controlled object completes its operation, the crank angle of the drive shaft of the press, which is a non-constant speed system, is converted into a set angle of the constant speed system based on conversion data prepared in advance. The set angle in this constant velocity system is advanced in the constant velocity system to become the corrected advance angle in the constant velocity system. The corrected advance angle in the constant velocity system is converted into the corrected advance angle in the non-constant velocity system based on the conversion data. It suffices to issue a control signal to the controlled object using the corrected advance angle in this non-uniform speed system.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

(First Embodiment) In FIG. 1, reference numeral 4 denotes a press shaft that rotates at a non-uniform speed during a cycle. The press shaft 4, the link mechanism 3, and the drive shaft 2
The press 1 is formed from slides and the like not shown.
The drive shaft 2 is rotated at a constant speed by the motor 5 (doiler 6), and its rotation speed can be changed by the SPM setting means 14 described later in detail.

Then, the press 1 is provided with a lead angle correction device 10,
In addition, an automatic conversion data creation device 30 is provided for the purpose of further expanding the usability of the advance angle correction device 10 and handling it. The memory 21 and the output means 20 that form a part of the advance angle correction device 10 form a conventional general electronic rotary cam switch. That is, the output means 20
Indicates that the rotation angle θp of the press detected by the angle detector 7 connected to the press shaft 4 is the corrected advance angle (correction advance angle) θc.
When it becomes equal to, the control signal S for starting and completing the controlled object 8 is output.
The angle detector 7 is formed of an absolute encoder.

Here, the advance angle correction device 10 advances (corrects) the value to be stored in the memory 21, that is, the set angle θs, by using the characteristics of the controlled object 8 and the SPM (advance angle, cut angle) (in the present invention). Is the corrected advance angle θc),
Although the press shaft 4 rotates at a non-uniform speed, the set angle θ
s and advance angle correction data (delay time Td, SPM) are set so that they can be automatically obtained.

That is, the present lead angle correction device 10 includes an angle setting means 11, a lead angle correction data setting means 12 (delay time setting means 13, SPM setting means 14), a memory 15 for storing conversion data, and a forward conversion means 16. The memory 17 stores a corresponding set angle θs ′, an advance angle correction means 18, an inverse conversion means 19, and the memory 21.

The angle setting means 11 sets the operation start point and operation completion point of each controlled object 8 as a set angle θs (entrance angle, cutting angle) corresponding to the non-uniform speed system rotation angle θv of the press shaft 4. is there. The set angle θs may be set as a value of an unequal speed system that is actually operated, and does not force the operator to perform dark conversion or the like.

Further, the advance angle correction data setting means 12 (13, 14) inputs (blocks) the SPM and the control signal S which is a unique value of each controlled object 8.
It is a means for setting a delay time Td from the start of the start operation to the start of the start operation (end of the completion operation), that is, advance angle correction data (SPM, Td). Since this advance angle correction data is the same as that in the conventional constant velocity system even in the non-uniform velocity system such as the present press, it is easy to set. The delay time of each controlled object 8
Since Td is an eigenvalue, it may be constant. However, in order to further expand the applicability, a different value may be set for each press speed, that is, SPM.

Now, as shown in FIG. 2, the memory 15 stores conversion data (θv, θr) of so-called angle between both systems in which the angle θv of the non-constant speed system is compared with the angle θr when the system is a constant speed system. I will let you know. This converted data is created on the following technical basis.

Now, assuming that the press shaft 4 is rotated from the slide top dead center (rotation angle 0 degree), it is assumed that, for example, a clock pulse signal having a constant frequency is counted from the time when the rotation is started to the time when an arbitrary time has elapsed, and the count value is n, on the other hand, when the total count value until the press shaft 4 makes one rotation and returns to the slide top dead center again is N, the rotation angle of the press shaft 4 in the constant velocity system at the time when the count value is n. θr is (n / N)
It is calculated as × 360 degrees. At the same time, the angle detector 7
The rotation angle θv (the non-constant speed system angle) when the count value becomes n out of the rotation angle θp is detected, and as a result, if the both angles θv and θr are compared, the non-constant speed system angle θv It is possible to obtain data for mutually converting the constant velocity system angle θr and the constant velocity system angle θr.

Therefore, both angles θv and θr may be obtained by manual calculation in advance and stored in a table as shown in FIG. 2, but in this embodiment, the automatic conversion data creation device 30 is provided and automatically set for the above reason. create. The details of the device 30 will be described later.

Next, the forward conversion means 16 determines the set angle θs in the non-constant speed system.
On the basis of the conversion data (θv, θr) to a set angle equivalent angle of the constant velocity system, that is, a corresponding set angle θs ′. That is, it is unequal to execute "the angle setting and the generation of the control signal S are performed in the actual non-uniform speed system, but the advance angle correction is performed in the non-uniform speed system" which is the technical feature of the present invention. The speed system angle (θs) is converted into the constant speed system angle (θs'). Converted constant velocity system angle, that is, corresponding set angle θ
s ′ is stored in the memory 17.

Now, the advance angle correction is performed by the advance angle correction means 18.

The advance angle correction means 18 is formed to have the following arithmetic functions and the like.

Here, for ease of understanding, the delay time Td of the controlled object 8 with respect to the control signal S is set to 50 msec, and the angle at which the controlled object 8 must complete the starting operation (the angle θ of the non-constant speed system).
Consider the case where s) is 70 degrees.

Then, the angle setting means 11 sets θs = 70 degrees, and this 70 degrees is converted by the forward conversion means 16 as shown in FIG.
It is converted to 40 degrees and stored in the memory 17.

Therefore, the advance angle correction means 18 first finds the average angular velocity ω of the press shaft 4 in the case of a constant velocity system. This average angular velocity ω
Assuming that the SPM set by the SPM setting means 14 is A, ω = (A / 60 sec) × (360 degrees) = 60 · A degrees / sec.

Here, the average angular velocity in constant velocity system ω = 60 · A degrees / sec
The delay time Td set by the delay time setting means 13 is 50 ms.
ec (50 × 10 ^-3 sec), SPM set by SPM setting means 14 is 6
If 0 spm, the advancing angle (quantity) Δθ is calculated from the equation of motion θ = ωt (θ: angle, ω: angular velocity, t: time) of the rotary system,
It is calculated as follows.

Δθ = (60 spm · 60 degrees / sec) × (50 × 10 ^-3 sec) = 18 degrees.

Therefore, the corresponding corrected advance angle θc ′ obtained by advancing the corresponding set angle θs ′ is θc ′ = θs′−Δθ = 40 ° −18 ° = 22 °.

That is, the constant velocity system angle is 22 degrees.

Thus, the inverse conversion means 19 inversely converts the corresponding corrected advance angle θc ′ into the advance angle corrected angle of the inconstant speed system, that is, the corrected advance angle θc, based on the conversion data (θv, θr). As is clear from FIG. 2, θc ′ = 22 is equal to θc = 26 degrees.
The corrected advance angle θc (= 26 degrees) is stored in the memory 21.

It is obvious that the advance angle correction means 18 may perform Δθ = ω · Td in real time or may prepare a table in advance.

Further, in the above-mentioned case, when the SPM is 120 spm, as shown by the chain double-dashed line in FIG. 2, the corresponding correction advance angle θc ₁ ′ is 4 degrees, and the correction advance angle θc ₁ is the non-uniform speed system. But it will be 4 degrees.

It should be noted that the start / end of the completion operation is similarly obtained.

Next, the automatic conversion data creation device 30 will be described.

The device 30 includes the angle detector 7, sampling means 31, counter 33, calculator 32, storage means 35 (36, 37) and the like.

The counter 33 counts the clock pulse signal CLK from the clock pulse signal generator 38, and can output the timing and the count value n up to that time for each time interval set by the sampling time setting device 34. , And the total count value N can be output when the press shaft 4 makes one rotation.

Then, the sampling means 31 latches the rotation angle θp at each time point (timing) when the count value n is output, specifies the angle as the non-uniform velocity angle θv, and stores it in the memory 36.

On the other hand, the calculator 32 calculates the angle θr at that time in the constant velocity system at each time when the count value n is output and stores it in the memory 37.

When the constant velocity system angle θr is the total count value N counted by the counter 33 until the press shaft 4 makes one rotation (however, N may be set in advance), θr = (n /
N) x 360 degrees.

Therefore, the storage means 35 (36, 37) stores the non-uniform velocity system angle θv and the constant velocity system angle θr, and the comparison data with the same timing is stored in the memory 15 as conversion data (θv, θr). To be done. The storage means 35 and the memory 15 can be integrally formed.

Next, the operation of this embodiment will be described with reference to FIGS. 1 and 2.

(Creation of converted data) This is performed using the automatic conversion data creation device 30.

First, the press shaft 4 is rotated once to obtain the total count value N of the clock pulse signal CLK of the counter 33 and temporarily store it in the calculator 32. You may set it manually.

Next, the sampling time setter 34 sets an interval (ms to μs) to be sampled, and the press shaft 4 is pressed again.
Rotate at a non-constant speed.

Then, the counter 33 outputs the count value n (at that point) for each set interval to the calculator 32 (sampling means 31).

Here, the sampling means 31 detects (latches) the non-uniform velocity system angle θv of the press shaft 4 at that time and stores it in the memory 36.
Remember. On the other hand, the calculator 32 performs a predetermined calculation process to calculate the constant velocity system angle θr at that time and stores it in the memory 37.

Therefore, the converted data (θv, θr) can be automatically stored in the memory 15.

It can be understood that even if the press shaft 4 rotates at a non-constant speed such as a link press, it can be converted into a constant velocity system angle by using only the angle detector 7 connected to the press shaft 4.

Note that the total count value N and the count value n for each set interval
May be determined within the same cycle of the press axis.

Furthermore, this conversion data is created by pressing the press shaft 4 at this time.
The resolution of the converted data can be increased by slowing down the rotation speed and setting the frequency of the clock pulse signal CLK high.

(Advance angle correction) The angle (θv) of the press shaft 4 at which the starting operation of each controlled object 8 should be started and the angle (θv) at which the completion operation should be completed are set in the angle setting means 11 as non-uniform velocity system angles. Further, the delay time Td for each controlled object 8 is set in the delay time setting means 13 of the advance angle correction data setting means 12, and the SPM to be operated is set in the SPM (press speed) setting means 14. That is, advance angle correction data (Td, SPM) is set.

Here, when the advance angle correction command is issued, the forward conversion means 16 converts the set angle θs of the non-constant speed system into the corresponding set angle θs' of the constant speed system based on the conversion data (θv, θr) and stores it in the memory 17. To do.

Subsequently, the advance angle correction means 8 receives the corresponding set angle θs ′ and the advance angle correction data (Td, SPM) as input and corrects the advance angle in the constant velocity system based on the above predetermined calculation to obtain the corresponding corrected advance angle θc ′. Ask.

Thereafter, the corresponding corrected advance angle θc ′ is inversely converted by the inverse conversion means 19 into the corrected advance angle θc of the non-constant speed system based on the conversion data and stored in the memory 21. This corrected advance angle θc
As shown in FIG. 2, for example, 60 spm and 120 spm are obtained for each target operation mode and for each controlled object 8.

(Press operation) If the motor 5 is started and the press 1 is started, the press shaft 4
Performs press working while rotating at a non-constant speed during one cycle.
With the rotation of the press shaft 4, the angle detector 7 momentarily detects the rotation angle θp in the non-constant speed system and inputs it to the output means 20.

When the input rotation angle θp matches the corrected advance angle θc stored in the memory 21, the output means 20 restrains the operation start point (angle) and the completion operation start point (angle) of the controlled object 8. The control signal S to be output is output.

Therefore, smooth press operation without interference between the die and the transfer means is guaranteed.

Therefore, according to this embodiment, the set angle θ of the non-uniform velocity system is
Based on the conversion data (θv, θc), the s is converted into the corresponding set angle θs ′ of the constant velocity system, and then the advance angle correction data (Td, S
This is a correction method in which the lead angle is corrected by PM) and the corresponding corrected lead angle θc 'is inversely converted again to be converted and stored into the corrected lead angle θc of the non-constant speed system. Even in a press that rotates at a constant speed, automatic advance angle correction can be performed accurately and quickly. Since the operator only has to set the angle in the non-uniform speed system of the actual operation, the handling is extremely simple, the labor can be drastically reduced, and no mistake is set. Therefore, it contributes to the effective use of link presses and the further spread of them.

Further, since the advance angle correction device 10 has a simple configuration including the setting means 11, 12 (13, 14), the conversion means 16, 19, the advance angle correction means 18, and the memories 15, 17, 21, It is easy to implement and low cost, and the advance angle correction can be automatically performed.

Further, since the automatic generation device 30 for the converted data (θv, θc) is provided, the operator's manual calculation and contrasting work can be wiped out, and from this point as well, the advance angle correction can be dramatically and accurately performed. it can.

(Second Embodiment) In the second embodiment, as shown in FIG. 3, the advance angle correction data setting means 12 of the first embodiment manually sets the delay time and the SPM in advance beforehand. And SPM setting means 1
4, the SPM setting means 14 is replaced by SPM automatic detection means 14 'so that the SPM of the lead angle correction data can be set in real time.

That is, the SPM automatic detection means 14 ′ is formed so as to obtain the SPM as the advance angle correction data for the speed of the press 1 which is actually operating, and to output this to the advance angle correction means 18. For this reason, the speed of the motor 5 is varied by the speed setting device 6 ', and the rotation speed of the drive shaft 2 is detected by the tachogenerator 5'. A pulse generator may be used instead of the tachogenerator 5 ', and it is possible to detect from the press shaft 4 side instead of the drive shaft 2 to the motor 5. That is, the press speed may be detected by using the angle detector 7 as shown by the chain double-dashed line in FIG.

Further, in order to perform the automatic advance angle correction in real time, the advance angle correction means 18 and the inverse conversion means 19 use the new SPM when the new SPM signal is input from the SPM automatic detection means 14 '. And is transformed.

Therefore, the corrected advance angle θc of the memory 21 is always updated in real time with the latest when the press speed changes in a passive or passive manner.

Therefore, according to the second embodiment, since the SPM of the advance angle correction data is updated and set to be suitable for the press speed, the same effect as the effect of the first embodiment can be obtained. In addition, it becomes unnecessary to manually set the SPM, and the optimum advance angle correction adapted to the press operation mode can be automatically performed, and the applicability can be dramatically expanded.

In each of the above embodiments, the advance angle correction device 10 and the automatic conversion data creation device 30 have a hardware logic configuration for convenience of description, but the invention is not limited to this, and as shown in FIG. As shown, it can also be constructed using the components of the press controller 100.

That is, the control device 100 shown in FIG. 4 has a CPU 101 that has a drive control function for the entire press and controls arithmetic operations / execution / commands, a ROM 102 that stores various programs, a RAM 103 as a memory, a keyboard 104 for setting various data, and a display. It comprises a device 105, a clock circuit 106 for managing time, an interrupt time management circuit 107, input / output ports 108, 109 and the like. Therefore, in the case of the first embodiment, the setting means 11, 12 (13, 14) of the advance angle correction means 10 are the keyboard 104, the memories 15, 17, 21 are the RAM 103, and the conversion means 16, 19 are used. And the advance angle correction means 18 with the CPU 101 and the ROM 102,
Can be built. The same applies to the automatic conversion data creation device 30. For example, the counter 33 can be formed by the interrupt time management circuit 107, the CPU 101, and the RAM 103, or the clock pulse signal generator 38 can be formed by using an oscillator in the clock circuit 106.

[Advantages of the Invention] In the present invention, the set angle in the drive shaft of the press, which is a non-constant speed system, is once replaced with the constant speed system, the corrected advance angle is calculated in the constant speed system, and the corrected advance angle in this constant speed system is calculated. Is converted to a non-uniform speed system, the number of data tables to be prepared for advance angle correction is small, and the correction advance angle can be calculated easily. Furthermore, since conversion data for the non-constant speed system and the constant speed system can be created relatively easily, it can be applied to various link motion presses.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a diagram for explaining the same operation, FIG. 3 is a block diagram showing a second embodiment, and FIG. 4 is a modification. It is a block diagram. 1 ... Press, 4 ... Press axis, 5 ... Motor, 5 '...
... tacho generator, 7 ... angle detector, 8 ... controlled object, 10 ... advance angle correction device, 11 ... angle setting means, 12 ...
Lead angle correction data setting means, 13 ... Delay time setting means, 14
... SPM setting means, 14 '... SPM automatic detection means, 15 ... memory for storing conversion data, 16 ... forward conversion means, 17 ...
… Memory, 18 …… Advance angle correction means, 19 …… Inverse conversion means, 20
...... Output means, 21 …… Memory, 30 …… Automatic conversion data creation device, 31 …… Sampling means, 32 …… Calculator, 33 ・ ・ ・
… Counter, 35 (36,37) …… Storage means.

Claims (2)

[Claims] 1. A method for correcting the advance angle of a press, which is a non-constant speed system driven by a press shaft that rotates at a non-constant speed during one cycle, wherein a set angle set in the non-constant speed system is predetermined. Converted to the set angle of the constant velocity system based on the converted data of the non-uniform velocity system angle and the constant velocity system angle, and then correcting the converted set angle by the advance angle correction data based on the constant velocity system. Thus, the corrected advance angle in the constant velocity system is obtained, and thereafter, the corrected advance angle is converted based on the conversion data to obtain the corrected advance angle in the inconstant speed system, and the corrected advance angle in the inconstant speed system is calculated. A method for correcting the advance angle of a press, which is characterized in that a control signal is output by using the method. 2. An advance angle correction device for a press driven by a press shaft which is a non-constant speed system that rotates non-constantly in one cycle, wherein angle data for operating a controlled object in the non-constant speed system. And an angle setting means for setting the advanced angle correction data of the controlled object, a memory for storing conversion data of the non-uniform velocity system angle and the constant velocity system angle, and the angle setting device. Forward conversion means for converting the set angle set by the means into a constant velocity system angle based on the conversion data stored in the memory, and the corresponding set angle converted by the conversion means is corrected by the advance angle correction data. An advance angle correction means for obtaining a corresponding corrected advance angle and an inverse conversion means for converting the corresponding corrected advance angle obtained by the advance angle correction means on the basis of the conversion data to obtain a corrected advance angle of the non-uniform velocity system. A press characterized by having Advance correction device.