KR20140034488A - Top dead center stop control device and control method for press apparatus - Google Patents

Abstract

The present invention relates to an angle sequencer for accurately controlling the top dead center stop position of a press machine in real time and a method of controlling the top dead center stop position of the press machine. In an apparatus for controlling the top dead center stop position of a press machine according to the present invention, an encoder (9) for detecting a rotation angle of a crank shaft (9) is included. In addition, an angle sequencer (46) is included, wherein the angle sequencer (46) receives a detection signal of the encoder (9), visibly shows an angle of the crank shaft (9) or the stop position of the slide (31), and controls an operating time point of a sol valve by taking into consideration an amount of slip of the crank shaft, so that the slide (31) stops at the top dead center stop point. A controller (43) detects a position (θx) of the crank shaft at a time point at which a cut off signal of the sol valve is generated for a brake operation when the operation of the press is stopped and an actual stop position (θy) of the crank shaft, calculates an amount (θs) of the slip of the crank shaft corresponding to the difference between the position (θx) and the actual stop position (θy), using the amount (θs) of the slip of the crank shaft as an offset amendment amount (θa), and generate the cut off signal of the sol valve for the stop operation of the press at the time point at which the crank shaft reaches a position prior to the top center stop position by the offset amendment amount (θa) in terms of time. [Reference numerals] (43) Controller

Description

Top dead center stop control device and control method for press apparatus}

The present invention relates to a top dead center stop control device and a control method of a press machine, and more particularly, to precisely control the top dead center stop position of the press in real time to protect the machine and mold due to the malfunction of the press operation and the precision of the workpiece The top dead center stop control device and control method of the new structure of the press machine is to be improved.

In general, the press is provided with a slide which is lifted by receiving the driving force of the motor, the upper die of the mold is fixed to the lower surface of the slide, the lower die of the mold is fixed to the lower bed of the upper die, and a material such as metal is placed on the lower die. The slide is then lifted to produce a product having the desired shape and dimensions while compressing or cutting the material between the upper and lower dies.

1 shows such a general press machine, and FIG. 2 is a sectional view thereof. The press machine includes a drive unit 10 including a motor 2, a crankshaft 3 and a flywheel 5 on the upper side of the frame 1, and a clutch plate for intermittent rotation of the drive unit 10 ( 21, an intermittent part 20 including a brake plate 22, a slide part 30 including a slide 31 connected to the driving part 10 in the middle, and an operation part 40 for operating a press machine. It consists of And the end of the crankshaft (3) is provided with an encoder (9) for detecting the rotation angle of the crankshaft (3), the control unit 43 to input and output the control signal of the press including the detection signal of the encoder (9) There is provided a control panel 42 is built. Between the clutch plate 21 and the brake plate 22 of the intermittent portion 20, a plurality of springs 26 and a piston 27 connected to the external sole valve 25 are installed. When the sole valve 25 is opened and air pressurizes the piston 27, the clutch plate 21 is transferred and compressed to the flywheel 5 so that the crankshaft 3 rotates. When the sole valve 25 is closed, the spring ( The brake plate 22 is transferred by the restoring force of the 26 and the piston 27, and the inner lining 24 of the brake plate 22 is pressed against the pressure plate 23 to stop the rotation of the crankshaft 3. 4 is a pulley, 6 is a wheel shaft, 8 is a gear, 32 is a connecting rod, 33 is a ball cup, 34 is an overload safety device, 37 is a guide, and 45 is a relay box.

On the other hand, the top dead center stop control device, called an angle sequencer, which is provided integrally with the operation panel 42 or provided separately, stops the crank shaft at the stop point of the slide 31 so as to accurately stop the lifting and lowering of the slide 31 at the top dead center. 3) shows the position visually and at the same time inputs the braking distance or slip amount data according to the operating speed of the press and the operating pressure of the press in advance, and thus the braking distance or slip amount according to the speed and pressure during the press operation. In consideration of this, before reaching the top dead center, the break point of the solenoid valve for brake operation is controlled so that the press stops at the top dead center. However, the conventional presses have a predetermined braking distance or set slip amount and error due to brake lining, clutch wear, solenoid valve wear, pressure fluctuations in the hydraulic system, and wear of the power transmission system due to prolonged use. As a result, the press frequently stops at a position outside the top dead center. In this case, the operator visually grasps the angular difference between the top dead center displayed on the angle sequencer and the actual stop position, and adjusts the press to stop at the top dead center by correcting and inputting the braking time from the top dead center, that is, the blocking signal generation point of the sole valve. In this way, it is not only cumbersome for the operator to grasp the stop position of the press with the naked eye and to correct it, but also the accuracy is low, which reduces the work efficiency of the press and also causes the press or mold due to the malfunction of the press and the precision of the workpiece. There was a problem that is lowered.

On the other hand, the data on various factors affecting the slip amount of the press is obtained in advance as an experimental value or an experience value, and these relational expressions are stored in advance, and the top dead center stop control of the press is performed according to the data and the relational expression. In this case, although considerable effort and cost are required for constructing a large amount of data, it is difficult to fully consider various factors, so it is difficult to trust the accuracy of top dead center stop control.

Japanese Laid Open Patent Publication 6-218595

The present invention has been proposed in view of the problem of control of the top dead center stop position of the conventional press machine as described above, and the present invention is directed to various factors that affect the slip amount without the operator's corrective input and when the press is stopped. By controlling the top dead center of the press precisely in real time without any consideration, it provides a top dead center stop control device and control method of the press machine with a new structure that effectively protects the machine and mold from the malfunction of the press operation and improves the precision of the workpiece. I would like to.

According to the present invention, the drive unit 10 including the motor 2 and the crankshaft 3 and the flywheel 5 provided on the upper side of the frame 1, and the clutch plate for intermittent rotation of the drive unit 10 An intermittent part 20 including a brake plate 22, a brake plate 22, and a sole valve 25 for operating the clutch plate 21 or the brake plate 22, and a slide connected to the drive unit 10 ( The slide unit 30 including 31, the operation unit 40 for operating the press machine, and the encoder 9 provided at the end of the crankshaft 3 to detect the rotation angle of the crankshaft 9 And receiving the detection signal of the encoder 9 to visually show the angle of the crankshaft 3 or the stop position of the slide 31 and the slide 31 to stop at the top dead center. In the press machine including a control unit 43 for controlling the operation time of the sole valve 25 in consideration of the slip amount, the control unit 43 is a press The position of the crankshaft (θx) and the actual stop position (θy) of the crankshaft at the time when the shutoff signal of the solenoid valve for brake operation is issued during any stop operation is detected and the slip amount (θs) of the crankshaft corresponding to the difference is detected. Calculate it, and use it as the offset compensation amount θa to control the shutoff signal of the solenoid valve for the stop operation of the press when the crankshaft reaches the position in time ahead of the top dead center by the offset compensation amount. Provided is a top dead center control apparatus for a press machine.

According to another feature of the invention, the offset correction amount θa is obtained from an average value of slip amount θs data at the last stop operation or a plurality of slip amount θs data at the latest stop operation. A top dead center control device is provided.

According to the present invention described above, in the case where the slide 31 stops at a position out of the top dead center due to wear of a brake, a clutch, or the like when the press is stopped, the control unit 43 at the time of any stop operation of the press. The position (θx) of the crankshaft and the actual stop position (θy) of the crankshaft at the time when the shutoff signal of the solenoid valve for braking operation is issued are detected, and the slip amount (θs) of the crankshaft corresponding to the difference is calculated. In the next stop operation, the sole valve for stopping operation of the press when the crankshaft reaches the position in time ahead of the top dead center by the offset correction amount (-θs) by the previous slip amount (θs). By controlling the shut-off signal, it is possible to control the brakes and clutches of the press without the manual adjustment of a separate operator or the accumulation or input of data on complicated slip amount variation factors. The top dead center at the stop can be controlled by reflecting the slip amount due to the fluctuation of hydraulic pressure, hydraulic pressure, and other parts in real time, so that the deviation of the top dead center stop operation can be minimized to minimize the accuracy of the stop operation of the press. In this way, it is possible to achieve a top dead center stop control device and a stop control method for a press machine, which effectively protect the machine and the mold due to the malfunction of the press operation and maintain the precision of the workpiece.

Further, according to the present invention, when the offset correction amount [theta] a data at any stop of the press is calculated on the basis of the average value of the slip amount [theta] s at the recent multiple stop operations, an exceptionally irregular variation is caused. The impact will be reduced to allow more stable and accurate top dead center control.

1 is an external configuration diagram of a conventional press machine
2 is a cross-sectional view of the press machine
3 is a block diagram of an embodiment of the present invention
Figure 4 is a flow chart showing a top dead center stop control method according to the present invention
5 is an exemplary diagram illustrating a control method according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 3 is a block diagram of an embodiment of the present invention, Figure 4 is a flow chart showing a top dead center control method of the press according to the present invention. The mechanical configuration of the embodiment according to the invention shown in FIG. 3 is generally similar to the conventional press machine shown in FIGS. 1 and 2, except that the embodiment shown in FIG. 3 is a control unit on the operation panel 42 of the press. In addition to 43, the angle sequence display unit 46 which visually shows the lifting position of the slide 31 or the rotation angle of the crankshaft 3 on the 360-circle is shown together. However, the top dead center stop control device, that is, the angle sequencer does not necessarily need to be built in the operation panel 42 together, and depending on the press machine, only the top dead center stop control device may be configured separately.

As shown, according to the present invention, there is provided a driving unit including a motor 2 and a crankshaft 3 and a flywheel 5 provided on the upper side of the frame 1, and the rotation of the driving unit 10 is provided. An intermittent part 20 is formed of a clutch plate 21 and a brake plate 22 to be interrupted, and a sole valve 25 for operating the clutch plate 21 and the brake plate 22. And the drive unit 10 is provided with a slide unit 30 including a slide 31, the operation unit 40 for operating the press machine is provided. At the end of the crankshaft 3 is provided an encoder 9 which is an angle detection sensor for detecting the rotational angle of the crankshaft 9, which uses a resolver or other suitable angle detection sensor.

The encoder 9 detects the stop position of the slide 31 which moves up and down or the angle at the stop of the crankshaft 3 which rotates and transmits it to the control part 43, and the control part 43 displays an angle sequence display. Through the section 46, the stop position of the slide 31 or the rotation angle or the stop angle of the crankshaft 3 is visually shown in real time.

On the other hand, the control unit 43 according to the present invention performs a real-time control for accurately maintaining the stop position of the slide 31 or the crankshaft (3) at the top dead center. This control operation will be described with reference to FIG. 4, first of all, the operation of the press is started (S1). Then, the controller obtains or detects the position of the crankshaft θx and the actual stop position θy at which the actual crankshaft is stopped (S2). Subsequently, the difference between the actual stop position θy of the crankshaft and the position θx of the crankshaft at the time when the sole valve shutoff signal is issued is calculated to calculate the slip amount θs of the actual crankshaft (S3). The slip amount θs of this crankshaft is the braking distance of the crankshaft and is expressed by an angle value. The control unit resets the slip amount θs to the offset correction amount θa for the top dead center stop control at the next stop operation (S4). When the press operation is resumed, the next stop time, the shutoff signal of the solenoid valve for the stop operation of the press is generated when the crankshaft reaches the position earlier in time by the offset compensation amount θa than the top dead center (S5). ). Subsequently, the process returns to step S2 again.

For example, as shown in the diagram of Fig. 5, the position (θx) of the crankshaft at the time when the sole valve shutoff signal for press stop is generated during the first press operation is the top dead center (0 degrees), and the actual crankshaft is When the stopped position θy is 50 degrees, the offset correction amount θa is set to −50. Accordingly, during the next stop operation of the press, a shutoff signal of the solenoid valve for stopping the press is issued when the crankshaft reaches the position which is 50 hours ahead of the top dead center. As a result, as illustrated in FIG. 5, when the crankshaft stops at the top dead center (0 degrees), a perfect top dead center stop is achieved and the slip amount is maintained at 50 degrees, so that the next offset correction amount is -50 degrees. Therefore, the solenoid shutoff signal was issued when the crankshaft was reached at 50 degrees in time than the top dead center during the next stop operation. This time, when the crankshaft stops at a position that has passed 10 degrees from the top dead center, it slips. Since the amount is 60 degrees, the next stop will control the stop operation by setting -60 as the offset compensation amount. This control operation is repeated every time the operation of the press is started and stopped.

In the above case, the offset correction amount for the stop operation of the press at any point of time is calculated based on the slip amount of the crankshaft during the last stop operation. Can be used as In this case, it is possible to reduce the excessive influence by exceptionally irregular fluctuation factors, thereby enabling more stable and accurate top dead center control.

In this way, in the operation of the press, the actual slip amount of the crankshaft 3 is detected at every stop of the crankshaft, and based on this, the offset correction amount is reset in real time so as to cancel the slip amount at the next stop operation. Thus, the stop position of the slide 31 at the time of press operation can be converged to always close to the top dead center, so that data on various factors affecting the slip amount without manual intervention by the operator and that is, the operation of the press Even when data on various factors such as speed, brake or clutch wear, fluctuations in pneumatic pressure, parts wear, brake temperature, etc. are not obtained and maintained, the slip amount reflected by these deviation factors is reflected in real time to stop the process. Top dead center can be controlled to minimize the deviation of the top dead center stop operation. Can not talk to the accuracy of the work, so that it is possible to effectively protect the machine and the mold due to a malfunction of the press operation to achieve top dead stop control apparatus and method of the press machine is kept high, the precision of the work.

Claims (2)

A drive unit 10 including a motor 2, a crankshaft 3, and a flywheel 5 provided on the upper side of the frame 1, a clutch plate 21 for controlling the rotation of the drive unit 10, and a brake. An intermittent part 20 including a plate 22 and a solenoid valve 25 for operating the clutch plate 21 or the brake plate 22, and a slide 31 connected to the drive unit 10. The control unit 43 includes a slide unit 30, an operation unit 40 for operating a press machine, and an encoder 9 provided at an end of the crank shaft 3 to detect a rotation angle of the crank shaft 9. In the press machine comprising the control part 43, the control unit 43 selects the position of the crankshaft θx and the actual stop position θy of the crankshaft at the time when the shutoff signal of the solenoid valve for brake operation is issued during any stop operation of the press. Detects and calculates the slip amount (θs) of the crankshaft corresponding to the difference, and stops next time by using it as the offset correction amount (θa) A top dead center control device for a press machine that controls the crankshaft to issue a shut-off signal for the solenoid valve for the stop operation of the press when the crankshaft reaches the position in time ahead of the top dead center.
2. The superior press machine according to claim 1, wherein the offset correction amount? A is obtained from an average value of slip amount? S data at the last stop operation or a plurality of slip amount? S data at the latest stop operation. Point controller.

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