JPH04210899A - Device for controller starting of motive pressing machine - Google Patents

Abstract

PURPOSE:To make shock at the time of starting min. and to smoothly start up a press at high velocity by making a clutch semi-clutch during the period before becoming the set velocity, controlling the actual acceleration to the set acceleration or lower and starting up. CONSTITUTION:The starting up control device in a motive pressing machine 1 provided the clutch 10 and a brake 20 is constituted of velocity setting means 34 for setting a velocity lower than press driving velocity, acceleration setting means 34 for setting the acceleration permitted during the term till reaching the set velocity, acceleration detecting means 31, 32, 33, 38 for detecting the actual acceleration of a crack shaft 2, PWM voltage signal generating means 39 for inputting the PWM voltage signal to a second valve 11 for working in the clutch 10 and control signal generating means 30, 32 for generating the control signal for controlling mode of the PWM voltage signal outputted from the PWM voltage signal generating means 39 by comparing the set acceleration with the actual acceleration.

Description

[Detailed description of the invention]

[00011

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a start control device for a power press machine equipped with a clutch and brake. [0002] FIG. 5 shows the general configuration of a power press machine 1. In the same figure, 2 is the crankshaft, and its eccentric portion 2
A slide 4 is connected to e via a connecting rod 3. Press rotation power is applied to the crankshaft 2 from a drive shaft 5 via a gear train 8. on the other hand,
A flywheel 6 rotationally driven by a motor 7 is coupled to and separated from a drive shaft 5 by a clutch 10. Therefore, the rotational energy accumulated in the flywheel 6 is transmitted to the drive shaft 5 by engaging the clutch 10,
Gear train 8. Crankshaft 2. It serves as a power source for moving the slide 4 up and down via the connecting rod 3. It is well known that in order to stop the slide 4 at the top dead center, it is sufficient to disengage the clutch 10 and then operate the brake 20. [0003] Furthermore, when the clutch 10 is of a pneumatic type,
By turning on the switch 39A and energizing the solenoid 11S, the electromagnetic valve 11 is opened and a predetermined air pressure is sent from the pipe 12 into the clutch 10 to perform a coupling operation. In other words, the clutch 10 is selected to transmit a rotational power corresponding to the maximum capacity of the power press machine through its engagement operation. Regarding this point, the same applies to clutches (10) of other types (for example, eddy current type). However, with this structure, an excessive impact is applied to the constituent members of the auxiliary equipment such as the press machine and the transfer mechanism at the time of startup, resulting in damage to the components. Therefore, each component must be made strong compared to the size of the press capacity, which increases the cost to 1. Alternatively, the maximum press operating speed must be limited to a low value. [0004] Here, as one way to solve this problem,
Initially, the rotational speed of the motor 7 (flywheel 6) is controlled to a low speed considerably lower than the predetermined operating speed of the press machine, and the clutch 10 is engaged, and then the rotational speed of the motor is gradually increased while monitoring the acceleration. A press acceleration control device was proposed to raise the speed to a predetermined operating speed (Special Publication Publication No. 51
No. 3950). According to this, since the press can be started at a speed lower than the press operating speed, the startup shock can be kept small. [0005]

[Problems to be Solved by the Invention] However, this method requires that the maximum operating speed of the power press machine is
Although it was effective in the era when the degree of damage was low, for example, several hundred 3PM
In the era of high-speed driving exceeding 200,000 yen, it is no longer possible to carry out this plan. In other words, since the shock applied to the press machine components at startup tends to be maximum when the acceleration starts from a stopped state of zero (0), how should the rotational speed of the motor 7 and flywheel 6 be adjusted when the clutch 10 is engaged? Even if we keep it small, it is no longer possible to provide a drastic countermeasure. [0006] Furthermore, the demand for improving press production efficiency, that is, shortening the time required to ramp up to a predetermined operating speed, cannot be met. This is because after the clutch 10 is engaged, the flywheel 6, which has an excessive mass, must be accelerated from a low speed to a predetermined high speed. Furthermore, with this method, for example, in the case of so-called safe mode press operation in which the slide 4 stops at top dead center every time it makes one stroke, the rotational speed of the flywheel 6 must be reduced to a low speed for each stroke, resulting in energy loss. It is no exaggeration to say that this is excessive and impractical. [0007] Here, an object of the present invention is to provide a starting control device for a power mechanical press that can improve press production efficiency, eliminate excessive energy loss, and minimize shock at starting. be. [0008]

[Means for Solving the Problems] The present invention returns to the technical point specific to power press machines, in which the impact at startup tends to be maximized from a stopped state to a certain speed. The above object is achieved by controlling the start-up operation in a half-clutch state. In other words, it is a start control device for a power breath machine that is equipped with a clutch that transmits the rotational energy of a flywheel driven by a motor to the crankshaft, and a brake that operates in reverse to this clutch and applies braking force to the crankshaft. a speed setting means for setting a speed lower than the press operating speed; an acceleration setting means for setting an acceleration allowed during a period until the set speed is reached; and an acceleration setting means for setting the actual acceleration of the crankshaft. A PW that applies a PWM@pressure signal to the acceleration detection means for detecting and the solenoid valve for operating the clutch.
PWM voltage signal generating means, which compares the set acceleration and the actual acceleration and outputs it from the PWM voltage signal generating means.
and a control signal generating means for generating a control signal for controlling the mode of the pressure signal, the clutch is operated in a half-clutch state until the set speed is reached, and the actual acceleration is controlled to be below the set acceleration. It is characterized in that it is configured to be started up. [0009]

[Operation] In the present invention, a speed lower than the press operating speed and a permissible acceleration are set in advance in the speed setting means and the acceleration setting means, respectively, in consideration of the design conditions and permissible maximum acceleration of the power press machine. . Further, the flywheel is accelerated to the press operating speed by a motor. When a press start command is given here, the control signal generating means compares the set acceleration with the actual acceleration detected by the acceleration detecting means and outputs an appropriate control signal. Then, the PWM voltage signal generating means intermittently operates the clutch actuating solenoid valve in a predetermined mode. That is, the clutch is operated half-way until the set speed is reached. Therefore, high-speed start-up is possible while minimizing the shock at start-up. Furthermore, since there is no need to reduce the rotational speed of the flywheel when stopped, rotational energy can be conserved. [00101

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, this activation control device includes a speed setting means (34), an acceleration setting means (34), an acceleration detection means (38, 31, 32, 33), a PWM@pressure signal generation means 39, and a control signal generation means. means (31, 32);
As shown in the figure, the clutch 10 is operated in a half-clutch state by PWM@pressure control during the period until the press operating speed reaches the set speed Vs, which is lower than the press operating speed Vc, to minimize the start-up shock. There is. Note that the power press machine (1) in this embodiment has the same structure as the conventional example shown in FIG. 5, so the explanation thereof will be omitted or simplified. [00111 In FIG. 1, reference numeral 30 denotes a CPU 31 . ROM that stores various programs
32. RAM 33 for temporarily storing various data. Keyboard 34. This is a drive control device having input/output boats 35, 36, etc., and controls the drive of the entire press machine. In this embodiment, these components and some of their functions are used to control the speed setting means, It constitutes an acceleration setting means, an acceleration detection means, and a control signal generation means. Here,
These means can be implemented as other configurations, such as logic circuits or the like. PWM voltage signal generation means 3
The same applies to 9, and it can also be formed integrally with the control signal generating means and the like. [0012] Now, the speed setting means sets the press operating speed V
It is a means for setting a speed Vs shown in FIG. 3, which is slower than Vs C, and is formed from the keyboard 34 shown in FIG. The set speed Vs is temporarily stored in the RAM 33. However, it may also be stored in the ROM 32 as a fixed value. This set speed Vs is determined by the clutch 10 as shown in FIG.
This defines the speed range in which the operating solenoid valve 11 (solenoid 11S) is controlled by PWM voltage. In other words, even if the clutch 10 is fully engaged at a speed higher than the set speed Vs, it will be accelerated by the inertia of the press machine 1, etc., and the acceleration will not exceed the allowable acceleration. Further, an acceleration setting means is also formed from a keyboard 34, and is used to set the maximum acceleration (αS in FIG. 2) allowed by the power breath machine 1. The set acceleration αS is stored in the RAM 33. [0013] On the other hand, the acceleration detection means is means for automatically detecting the actual acceleration (α in FIG. 2) of the power press machine 1 at that time, and is a means for automatically detecting the actual acceleration (α in FIG.
and CPU31. It is formed from ROM32. In other words, from the rotation angle change detected by the encoder 38,
The CPU 31 calculates the actual acceleration α based on the calculation formula stored in the M33. The calculated actual acceleration α is also RAN1
33, and its value is updated from time to time. In addition,
37 in FIG. 1 is a driver. [0014] Next, as shown in FIG. 4, the pwM@pressure signal generating means 39 generates pulse signals (
PWM) is added to the solenoid IIS, and the set voltage value and time width can be set variably. It may be formed from an existing pWM circuit. Here, the control signal generating means is the CPU
31. A control signal S is input to the means 39 for controlling the mode of the PWM voltage signal output from the PWM voltage signal generating means 39 by comparing the set acceleration αS formed from the ROM 32 and read from the RAM 33 with the actual acceleration α. . [0015] In this embodiment, the P~'M voltage signal generating means 39 has a width of 1 as shown in step (ST) 12 of FIG.
It is configured to output a PWM voltage signal of mS, and the control signal S specifies the number of pulses to control the mode. That is, the press speed V reaches the set speed Vs (YES in S"116 is determined)
Up to this point, it is assumed that the control signal S specifies °゛N+1°゛ signals PWM, and if α>αS on the way (ST
14) is formed to block the signal PWM as "N-1". Therefore, in practice, the keyboard 3
If the value of acceleration αS set to 4 is set to a value slightly smaller than the maximum acceleration allowed by the power breather, considering the followability of the power breather machine 1, the acceleration can be kept within a safe range while reaching the set speed Vs. It can be started up smoothly and quickly. [00161] Next, the operation of this embodiment will be explained. The speed setting means (34) sets the speed Vs shown in FIG. 3 in advance, and the acceleration setting means (34) sets the allowable acceleration αS in advance. On the other hand, while a press operation command is given, the motor 7 is driven and the rotational speed of the flywheel 6 is set up in advance to correspond to the press operation speed Vc corresponding to the signal applied to the driver 37. Thereby, the start-up time of the motor 7 and the flywheel 6 can be eliminated from the press start-up time. [0017] Here, when a press operation command is given, the acceleration detection means (38, 31, 32) detects the press machine 1 (
The actual acceleration α of the crankshaft 2) is detected. On the other hand, the control signal generating means (31, 32) compares the set acceleration αS read from the RAM 33 with the actual acceleration α and outputs a control signal S to the pressure signal generating means 39. Initially, since the actual acceleration α is zero (0), the control signal S specifying N=1 as shown at 5TIO in FIG.
is output. Then, the PWM@pressure signal generating means 39 outputs one pulse signal PWM having a width of 1 ms as shown in FIG. 4 (SrI2). Therefore, the solenoid 11S is energized for 1 ms, the clutch 10 is engaged for a short time, that is, becomes a half-clutch, and the rotational energy of the flywheel 6 is transmitted to the main shaft 5. Then, the crankshaft 5 starts rotating slowly, so that the shock at the time of starting can be made very small. [0018] Subsequently, when it is determined at 5T16 that the press speed V is lower than the set speed Vs, the CPU 31 as a control signal generating means applies a control signal S specifying "N+1". As a result, the clutch 10 is again operated in a half-clutch state, so that the means 39 outputs a gradually increasing P'vVM@ pressure signal as shown in FIG. As a result, the rotational speed of the crankshaft 2 can be gradually increased. In addition, when α) αs becomes (ST14) in the middle, a control signal S specifying 'N-1' is outputted, and the signal is switched to a PWM@pressure signal with a small width to suppress the rotational speed increase rate (acceleration α). Eventually, when V≧Vs (ST16), continuous pulses are output from the PWM voltage signal generating means 39 (ST22), and the press operation speed is quickly increased to Vc.At this stage, the press speed is considerably high. Since the acceleration is high, the set acceleration αS will not be exceeded from now on. Therefore, the impact is kept within the allowable range and press operation is started quickly and smoothly. [0019] On the other hand, to stop the press, the PWM voltage signal is The generating means 39 is shut off and the clutch 1o is separated. At this time, since the flywheel 6 continues to rotate while retaining the rotational energy at that time, the motor 7 and the flywheel 6 are stopped as in the conventional example. There is no energy loss, and the crankshaft 2 is stopped at, for example, top dead center by the operation of the brake 20. [0020] According to this embodiment, the speed setting means, the acceleration setting means, and the acceleration detection A set acceleration αS is provided until the press speed V reaches the set speed Vs.
Since the configuration is such that the rotational speed of the crankshaft 2 is started up while observing the set acceleration αS while the clutch 10 is in a half-clutch state by PWM@pressure control, the rotational speed of the crankshaft 2 is set to the set acceleration αS. This minimizes the impact on the press at start-up and allows the press to start up to operating speed quickly and smoothly. [00211 Furthermore, since the motor 7 and the flywheel 6 are started in a half-clutch state, there is no need to slow down or stop the rotation speeds of the motor 7 and the flywheel 6 in preparation for the next start, and the rotational energy can be effectively conserved and the motor 7 and the flywheel 6 are High-speed startup can be achieved by omitting the startup time of the wheel 6. [0022] Also, the speed setting means, acceleration setting means, control signal generation means, etc. are implemented by the CPU 31. which is a component of the drive control device 30 of the press machine. ROM32. Since the keyboard 34 is also used as the keyboard 34, high reliability and high-speed response operation can be achieved. Furthermore, since the PWM@pressure signal generating means 39 has an independent structure, the value of the PWM@pressure signal, its pulse width, etc. can be adjusted to match the characteristics of the press machine 1, and the applicability is wide. [0023] As described above, the present invention includes a speed setting means, an acceleration setting means, an acceleration detecting means, a PWM@pressure signal generating means, and a control signal generating means, and the clutch is held half-clutched until the set speed is reached. Since it is configured to start up while holding the allowable acceleration within the set acceleration, it is possible to start press operation at high speed and smoothly while preserving the rotational energy of the flywheel while minimizing the shock at start-up, resulting in high production efficiency and safety. A power breath machine can be established.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall configuration of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation.

FIG. 31 is a diagram for explaining a PWM control range. FIG. 4 is a diagram for explaining the output state of a PWM voltage signal. FIG. 5 is a diagram showing the structure of a power press machine.

[Explanation of symbols]

1 Power breath machine 2 Crankshaft 4 Slide 5 Drive shaft 6 Flywheel 7 Motor 10 Clutch 11 Solenoid valve for clutch operation 11S Solenoid 20 Brake 30 Drive control device 31 CPU (acceleration detection means, control signal generation means)
32 ROM (acceleration detection means, control signal generation means) 33
RAM (acceleration detection means) 34 Keyboard (speed setting means, acceleration setting means) 3
7 Driver encoder (acceleration detection means) PWM@pressure signal generation means

Claims (1)

[Claims] 1. Start-up control of a power press machine comprising a clutch that transmits the rotational energy of a flywheel rotationally driven by a motor to the crankshaft, and a brake that operates in reverse to this clutch and applies braking force to the crankshaft. The apparatus includes a speed setting means for setting a speed lower than the press operating speed, an acceleration setting means for setting an acceleration allowed during a period until reaching the set speed, and a crankshaft. acceleration detection means for detecting actual acceleration;
PWM voltage signal generating means for applying a PWM voltage signal to the solenoid valve for actuating the clutch; and PWM voltage signal generating means for comparing the set acceleration and actual acceleration and outputting a PWM voltage signal from the PWM voltage signal generating means.
control signal generating means for generating a control signal for controlling the mode of the WM voltage signal, and controlling the actual acceleration to be less than the set acceleration by operating the clutch at a half-clutch operation during a period until the set speed is reached. What is claimed is: 1. A start control device for a power press machine, characterized in that the start control device is configured to start up the power press machine.