JP2021194700A - Die cushion device of press machine - Google Patents

Abstract

To provide a die cushion device of a press machine that is equipped with a locking mechanism that can be easily installed in an existing die cushion device and can easily secure a function of temporarily stopping a cushion pad.SOLUTION: A die cushion device 10 of a press machine comprises a cushion pad 2, a cushion cylinder 21, cushion air supply/exhaust means 22, and a locking mechanism 4 that temporarily stops the cushion pad in the vicinity of a bottom dead point of a slide. The locking mechanism is provided with slide position detecting means 41, locking position setting means 42 that sets a slide position at which the cushion pad is locked, and locking control means 43. The locking control means, when a slide position signal received from the slide position detecting means matches a slide position signal set by the locking position setting means, outputs a slide stop signal to slide driving means and outputs an exhaust signal to the cushion air supply/exhaust means.SELECTED DRAWING: Figure 1

Description

The present invention relates to a die-cushion device of a press machine, and more particularly to a die-cushion device of a press machine provided with a locking mechanism for suspending the cushion pad of the press machine near the bottom dead center of a slide.

Conventionally, press machines that perform draw forming and the like are equipped with a die cushion device for the purpose of controlling the inflow resistance of the material during drawing and forming and releasing the pressed product after forming from the lower mold. .. For example, as shown in FIG. 11, in the conventional die cushion device 100, a cushion pad 102 and a pneumatic type cushion pad 102 are moved up and down below the floor surface on which the bolster 101 supporting the lower mold 106 is fixed. It is provided with a cushion cylinder 103. A cushion pin 104 that transmits the air pressure (cushion pressure) from the cushion cylinder 103 to the lower ring 105 or the like is inserted into the bolster 101, and the lower end of the cushion pin 104 is in contact with the cushion pad 102.

Further, in the die cushion device 100, in order to prevent deformation due to biting of the pressed product W into the upper die 107 after molding, the rise of the cushion pad 102 is temporarily stopped near the bottom dead center of the slide 108 (hereinafter referred to as “)”. It may be equipped with a locking mechanism 109 for (also referred to as "locking"). As shown in FIG. 11, the conventional locking mechanism 109 includes, for example, a locking hydraulic device 111 mounted on an intermediate portion of a cushion rod 110 extending downward from the cushion pad 102, and the locking hydraulic device 111 includes a locking hydraulic device 111. A locking valve 112 that locks the vertical movement of the piston in the hydraulic cylinder connected to the cushion rod 110 is provided. Further, in the die cushion device 100, a stroke adjusting device 113 for adjusting the stroke amount of the cushion pad 102 is attached to, for example, the lower end portion of the cushion rod 110.

As described above, the die cushion device 100 provided with the conventional locking mechanism 109 is in the middle of the cushion rod 110 extending downward from the cushion pad 102, separately from the pneumatic cushion cylinder 103 that moves the cushion pad 102 up and down. Since the locking hydraulic device 111 mounted on the portion and the stroke adjusting device 113 mounted on the lower end portion of the cushion rod 110 are provided, the structure of the die cushion device 100 is complicated and enlarged, and the pit under the floor is increased. It is necessary to dig deeply, and there is a problem that not only the equipment cost but also the equipment installation cost and the construction period increase. Further, since the locking hydraulic device 111 is provided, there is a problem that the maintenance cost for the hydraulic pump, the hydraulic piping, and the like increases.

Therefore, in order to improve problems such as complication and upsizing of the die cushion device 100, for example, in Patent Document 1, as shown in FIG. 12, the locking mechanism 201 of the die cushion device 200 is provided with the lower end of the cushion rod 202. It is composed of a high lead nut 204 screwed into the high lead screw 203 formed on the side and a brake 205 that restrains the rotation of the high lead nut 204. By restraining the rotation of the high lead nut 204 by the brake 205. , A die cushioning device 200 of a press machine capable of locking the cushion pad 206 at an arbitrary stroke position is disclosed.

Jitsukaihei No. 5-53728 Gazette

However, in the locking mechanism 201 of the die cushion device 200 disclosed in Patent Document 1, the high lead nut 204 screwed into the high lead screw 203 formed on the lower end side of the cushion rod 202 and the rotation of the high lead nut 204 Since it is configured by the brake 205 that restrains the above, it can be made smaller than the above-mentioned locking hydraulic device 111, but it requires a certain amount of installation space, and the above-mentioned locking mechanism is compared with the die cushion device of the existing press machine. Adding 201 was not always easy.

Further, the locking mechanism 201 has a structure in which the cushion pad 206 is locked at an arbitrary stroke position by restraining the rotation of the high lead nut 204 by the brake 205, but between the high lead nut 204 and the brake 205. There is also a problem that mechanical slippage is likely to occur and it is difficult to secure the temporary stop function of the cushion pad 206.

The present invention has been made to solve the above problems, and is a die of a press machine equipped with a locking mechanism that can be easily installed in a die cushion device of an existing press machine and easily secures a temporary stop function of a cushion pad. It is intended to provide a cushioning device.

In order to achieve the above object, the die cushion device of the press machine according to the present invention has the following configuration.
(1) A cushion pad arranged below the press machine, a cushion cylinder for moving the cushion pad up and down, a cushion air supply / exhaust means for supplying or discharging cushion air to the cushion cylinder, and the cushion pad. A die cushion device for a press machine equipped with a locking mechanism that pauses near the bottom dead center of the slide.
The locking mechanism includes
A slide position detecting means for detecting the vertical position of the slide, and
A locking position setting means for presetting a slide position when locking the cushion pad, and a locking position setting means.
The slide position detecting means, the slide driving means for driving the slide, and the locking control means connected to the cushion air air supply / exhaust means are provided.
When the slide position signal received from the slide position detecting means matches the slide position signal set by the locking position setting means, the locking control means sends a slide stop signal for suspending the slide to the slide driving means. It is characterized in that it outputs and outputs an exhaust signal for exhausting the cushion air to the cushion air supply / exhaust means.

In the present invention, the locking mechanism includes a slide position detecting means for detecting the vertical position of the slide, a locking position setting means for presetting the slide position when locking the cushion pad, and a slide position detecting means and a slide. The slide driving means and the locking control means connected to the cushion air supply / exhaust means are provided, and the locking control means matches the slide position signal received from the slide position detecting means with the slide position signal set by the locking position setting means. When this is done, a slide stop signal for temporarily stopping the slide is output to the slide drive means, and an exhaust signal for exhausting the cushion air is output to the cushion air supply / exhaust means. Based on the slide position, the slide can be paused, and the cushion air of the cushion cylinder can be exhausted to reduce the pressure during the pause of the slide to stop the ascent of the cushion pad. Therefore, for example, the slide can be lowered at a normal press speed (for example, about 15 to 18 spm), the slide can be paused at an arbitrary position near the bottom dead center, and the cushion pad can be locked. As a result, it is possible to secure the temporary stop function of the cushion pad while ensuring the molding touch speed at the normal press speed.

Further, the locking mechanism is composed of a slide position detecting means, a locking position setting means and a locking control means, and the slide position detecting means, the locking position setting means and the locking control means are all composed of an electric control means or the like. Therefore, there are few problems with the installation space. Therefore, the locking mechanism can be easily installed in the die cushion device of the existing press machine.

Therefore, according to the present invention, it is possible to provide a die cushion device of a press machine which can be easily installed in a die cushion device of an existing press machine and has a locking mechanism which makes it easy to secure a temporary stop function of the cushion pad.

(2) In the die cushion device of the press machine described in (1),
The locking control means outputs a slide drive signal for driving the slide to the slide drive means after a lapse of a predetermined time after outputting the slide stop signal, and the cushion to the cushion air supply / exhaust means. It is characterized by outputting an exhaust stop signal that stops the exhaust of air.

In the present invention, the locking control means outputs a slide drive signal for driving the slide to the slide drive means after a lapse of a predetermined time after outputting the slide stop signal, and cushion air to the cushion air supply / exhaust means. Since an exhaust stop signal is output to stop the exhaust of the cushion, a predetermined amount of cushion air from the cushion cylinder is exhausted during a predetermined time from when the slide is stopped until it is re-driven, and the cushion pad is locked. The slide can be raised to the top dead point while locked. Further, when the slide is raised to the top dead center, the exhaust of the cushion air can be stopped. Therefore, the locking control means can easily set the ascending timing of the slide only by using the timer function for counting a predetermined time, and can prevent unnecessary exhaust of the cushion air while the slide is ascending.

Therefore, according to the present invention, a locking mechanism that can be easily installed in the die cushion device of an existing press machine, secures a pause function of the cushion pad by using a simple timer function, and prevents unnecessary exhaust of cushion air. A die cushioning device for a press machine can be provided.

(3) In the die cushion device of the press machine described in (2),
The predetermined time from the output of the slide stop signal to the output of the slide drive signal by the locking control means is the cushion air of the cushion cylinder up to the upper limit air pressure capable of holding the locked state of the cushion pad. It is characterized by the time to exhaust.

In the present invention, the cushion air of the cushion cylinder is exhausted up to the upper limit air pressure that can maintain the locked state of the cushion pad for a predetermined time from the output of the slide stop signal to the output of the slide drive signal by the locking control means. Since it is time to lock the cushion pad, the amount of cushion air exhausted from the cushion cylinder can be minimized, and the amount of cushion air supplied to the cushion cylinder to raise the cushion pad after locking. Can be minimized. Further, since the displacement of the cushion air exhausted from the cushion cylinder can be minimized in order to lock the cushion pad, it is possible to minimize the time for pausing the slide with the locking of the cushion pad.

Therefore, according to the present invention, it is provided with a locking mechanism that can be easily installed in the die cushion device of an existing press machine and can minimize the amount of cushion air discharged for locking the cushion pad and the pause time of the slide. A die cushioning device for a press machine can be provided.

(4) In the die cushion device of the press machine described in (1),
The locking mechanism includes a cushion pressure detecting means for detecting the air pressure of the cushion cylinder and a locking holding pressure setting means for presetting an upper limit air pressure capable of holding the locked state of the cushion pad.
The locking control means is a slide drive signal for driving the slide with respect to the slide drive means when the air pressure signal received from the cushion pressure detecting means and the air pressure signal set by the locking holding pressure setting means match. Is output, and an exhaust stop signal for stopping the exhaust of the cushion air is output to the cushion air supply / exhaust means.

In the present invention, the locking mechanism includes a cushion pressure detecting means for detecting the air pressure of the cushion cylinder and a locking holding pressure setting means for presetting an upper limit air pressure capable of holding the locking state of the cushion pad. When the air pressure signal from the cushion pressure detecting means and the air pressure signal set by the locking holding pressure setting means match, the locking control means outputs a slide drive signal for driving the slide to the slide drive means. Since an exhaust stop signal to stop the exhaust of cushion air is output to the cushion air supply / exhaust means, confirm that the air pressure of the cushion cylinder has been reduced to the upper limit air pressure that can maintain the locking state of the cushion pad. , The slide can be raised. Therefore, when the slide is raised, it is possible to surely prevent the cushion pad from being raised together, and it is possible to further improve the pause accuracy in the locking of the cushion pad. Further, since the locking control means outputs the slide drive signal and the exhaust stop signal at the same time, it is possible to suppress excessive exhaust of the cushion air to the cushion cylinder. Therefore, the refilling time of the cushion air for the cushion cylinder can be shortened, and the restart time until the slide reaches the top dead center and then re-descends can be shortened.

Therefore, according to the present invention, a press machine provided with a locking mechanism that can be easily installed in the die cushion device of an existing press machine and can shorten the restart time of the slide while improving the pausing accuracy of the cushion pad. A die cushioning device can be provided.

(5) A cushion pad arranged below the press machine, a cushion cylinder for moving the cushion pad up and down, a cushion air supply / exhaust means for supplying or discharging cushion air to the cushion cylinder, and the cushion pad. A die cushion device for a press machine equipped with a locking mechanism that pauses near the bottom dead center of the slide.
The locking mechanism includes
A slide position detecting means for detecting the vertical position of the slide, and
A locking position setting means for presetting a slide position when locking the cushion pad, and a locking position setting means.
A cushion height detecting means for detecting the ascending height of the cushion pad with respect to the descending position as the cushion height,
The slide position detecting means, the slide driving means for driving the slide, the cushion air supply / exhaust means, and the locking control means connected to the cushion height detecting means are provided.
When the cushion height signal received from the cushion height detecting means indicates zero mm, the locking control means outputs a slide stop signal to the slide driving means, and the slide position signal received from the slide position detecting means is received. When it matches the slide position signal set by the locking position setting means, it is characterized in that an exhaust signal for exhausting the cushion air is output to the cushion air supply / exhaust means.

In the present invention, the locking mechanism includes a slide position detecting means for detecting the vertical position of the slide, a locking position setting means for presetting the slide position when locking the cushion pad, and an ascending height with respect to the descending position of the cushion pad. A cushion height detecting means for detecting the cushion height, a slide position detecting means, a slide driving means for driving the slide, a cushion air supply / exhaust means, and a locking control means connected to the cushion height detecting means. When the cushion height signal received from the cushion height detecting means indicates zero mm, the locking control means outputs a slide stop signal to the slide driving means, and the slide position signal received from the slide position detecting means is the locking position. When it matches the slide position signal set by the setting means, an exhaust signal to exhaust the cushion air is output to the cushion air supply / exhaust means, so confirm that the cushion pad has arrived at the descending position and temporarily move the slide. It can be stopped. Further, based on an arbitrary slide position set by the locking position setting means, the cushion air of the cushion cylinder can be exhausted to reduce the pressure, and the ascending can be stopped at the descending position of the cushion pad. Therefore, for example, the slide can be lowered at a normal press speed (for example, about 15 to 18 spm) to suspend the slide at the lowered position of the cushion pad, and the cushion pad can be locked at the lowered position. As a result, it is possible to stably secure the pause function at the lowering position of the cushion pad while the molding touch speed at the normal press speed is secured.

Further, the locking mechanism is composed of a slide position detecting means, a locking position setting means, a cushion height detecting means, and a locking control means, and the slide position detecting means, the locking position setting means, and the locking control means are all electrically controlled. Since it is composed of means, there are few problems in terms of installation space. Further, the cushion height detecting means can be easily installed, for example, between the side wall of the cushion pad and the cushion cylinder. Therefore, the locking mechanism can be easily installed in the die cushion device of the existing press machine.

Therefore, according to the present invention, there is a die cushioning device for a press machine that can be easily installed in the die cushioning device of an existing press machine and has a locking mechanism that makes it easy to stably secure a pause function at the lowered position of the cushion pad. Can be provided.

(6) In the die cushion device of the press machine described in (5),
The locking mechanism includes a cushion pressure detecting means for detecting the air pressure of the cushion cylinder and a locking holding pressure setting means for presetting an upper limit air pressure capable of holding the locked state of the cushion pad.
The locking control means is a slide drive signal for driving the slide with respect to the slide drive means when the air pressure signal received from the cushion pressure detecting means and the air pressure signal set by the locking holding pressure setting means match. Is output, and an exhaust stop signal for stopping the exhaust of the cushion air is output to the cushion air supply / exhaust means.

In the present invention, the locking mechanism includes a cushion pressure detecting means for detecting the air pressure of the cushion cylinder and a locking holding pressure setting means for presetting an upper limit air pressure capable of holding the locking state of the cushion pad. When the air pressure signal received from the cushion pressure detecting means and the air pressure signal set by the locking holding pressure setting means match, the locking control means outputs a slide drive signal for driving the slide to the slide drive means. Since an exhaust stop signal to stop the exhaust of cushion air is output to the cushion air supply / exhaust means, confirm that the air pressure of the cushion cylinder has been reduced to the upper limit air pressure that can maintain the locking state of the cushion pad. , The slide can be raised. Therefore, when the slide is raised, it is possible to prevent the cushion pad from being raised at the same time, and it is possible to further improve the pause accuracy in the locking of the cushion pad. Further, since the locking control means outputs the slide drive signal and the exhaust stop signal at the same time, it is possible to suppress excessive exhaust of the cushion air to the cushion cylinder. Therefore, the refilling time of the cushion air for the cushion cylinder can be shortened, and the restart time until the slide reaches the top dead center and then re-descends can be shortened.

Therefore, according to the present invention, a press machine provided with a locking mechanism that can be easily installed in the die cushion device of an existing press machine and can shorten the restart time of the slide while improving the pausing accuracy of the cushion pad. A die cushioning device can be provided.

(7) In the die cushion device of the press machine described in (6),
When the cushion height signal received from the cushion height detecting means exceeds zero mm, the locking control means outputs a slide stop signal to the slide driving means, and the locking holding pressure setting means sets the same. It is characterized in that the upper limit air pressure capable of holding the locking state of the cushion pad is reset based on the air pressure signal of the cushion pressure detecting means.

In the present invention, the locking control means outputs a slide stop signal to the slide drive means when the cushion height signal received from the cushion height detection means exceeds 0 mm, and is set by the locking holding pressure setting means. Since the upper limit air pressure that can hold the locked state of the cushion pad is reset based on the air pressure signal of the cushion pressure detecting means, the upper limit that can hold the locked state of the cushion pad that has been reset from the next press molding is set. At the air pressure of, the slide drive signal for driving the slide can be output to the slide drive means to raise the slide earlier. Therefore, the restart time of the slide can be further shortened.

Therefore, according to the present invention, the slide can be easily installed in the die cushion device of an existing press machine, and the slide is raised with an upper limit air pressure that can hold the locking state of the cushion pad, further increasing the restart time of the slide. A die cushioning device for a press machine with a locking mechanism that can be shortened can be provided.

(8) In the die cushion device of the press machine according to any one of (5) to (7).
The locking mechanism includes a cushion height display means that displays a one-cycle waveform of the cushion height based on a cushion height signal received from the cushion height detecting means.
The locking control means is characterized in that when the cushion pad reaches an ascending position, a display signal for displaying the one-cycle waveform is output to the cushion height display means.

In the present invention, the locking mechanism includes a cushion height display means for displaying one cycle waveform of the cushion height based on a cushion height signal received from the cushion height detecting means, and the locking control means is a cushion pad. When the cushion height display means is reached, a display signal for displaying a one-cycle waveform is output, so that the operation trajectory of the cushion pad descending and ascending in the press forming process can be known in detail. Therefore, it is possible to more accurately grasp the upper limit air pressure that can hold the locked state of the cushion pad, and for example, it is possible to recognize an abnormality in height when the cushion pad is raised, a variation in the lowered position of the cushion pad, and the like. , The causal relationship between press molding quality and cushioning operation can be analyzed. As a result, it can contribute to early stabilization of press molding quality.

Therefore, according to the present invention, a press machine equipped with a locking mechanism that can be easily installed in a die cushion device of an existing press machine, grasps the operation trajectory of the cushion pad, and easily secures press molding quality in a shorter period of time. A die cushioning device can be provided.

(9) In the die cushion device of the press machine according to any one of (1) to (8).
The locking mechanism includes a cushion air exhaust means for discharging the cushion air to the cushion cylinder.
When the slide position signal received from the slide position detecting means matches the slide position signal set by the locking position setting means, the locking control means outputs an exhaust signal for exhausting the cushion air to the cushion air exhaust means. It is characterized by outputting.

In the present invention, the locking mechanism includes cushion air exhaust means for discharging cushion air to the cushion cylinder, and the locking control means is a slide set by the locking position setting means as a slide position signal received from the slide position detecting means. When it matches the position signal, an exhaust signal for exhausting the cushion air is output to the cushion air exhaust means. Therefore, when the slide position signal received from the slide position detection means matches the slide position signal set by the locking position setting means. , Cushion air can be exhausted simultaneously from both the cushion air supply / exhaust means and the cushion air exhaust means. Therefore, the discharge time of the cushion air required for locking the cushion pad can be further shortened. Further, since the cushion air exhaust means is composed of pipes, valves, and the like, there are few problems in terms of installation space. Therefore, the cushion air exhaust means can be easily installed in the die cushion device of the existing press machine.

Therefore, according to the present invention, there is provided a die cushion device for a press machine, which can be easily installed in a die cushion device of an existing press machine and has a locking mechanism that makes it easy to secure a pause function of a cushion pad in a shorter time. be able to.

(10) In the die cushion device of the press machine according to any one of (1) to (9).
The slide position detecting means detects the slide angle as the vertical position of the slide via a drive gear interlocking with the drive motor of the slide drive means.
The locking position setting means is characterized in that the slide position when the cushion pad is locked is set by the slide angle.

In the present invention, the slide position detecting means detects the slide angle as the vertical position of the slide via the drive gear interlocked with the drive motor of the slide drive means, so that the slide of the slide angle reader provided in the existing press machine is provided. The angle signal can be diverted, and the slide angle can be easily acquired as the vertical position information of the slide without adding a special detection means. Further, in the locking position setting means, the slide position when locking the cushion pad is set by the slide angle, so that the slide angle when locking the cushion pad can be easily set on the operation panel of the existing press machine. ..

Therefore, according to the present invention, a press provided with a locking mechanism that secures a pause function of a cushion pad by using a slide angle signal that can be easily installed in a die cushion device of an existing press machine and can be more easily acquired and set. A mechanical die cushioning device can be provided.

According to the present invention, it is possible to provide a die cushion device of a press machine which can be easily installed in a die cushion device of an existing press machine and has a locking mechanism which makes it easy to secure a temporary stop function of the cushion pad.

It is an overall block diagram of the die cushioning apparatus of the press machine of 1st Embodiment which concerns on this embodiment. It is an enlarged sectional view of the press machine shown in FIG. It is a circuit block diagram of the cushion air supply / exhaust means shown in FIG. It is a circuit block diagram of the cushion air exhaust means shown in FIG. It is operation flow diagram of the locking mechanism in the die cushion device of the press machine shown in FIG. It is an overall block diagram of the die cushioning apparatus of the press machine of 2nd Embodiment which concerns on this embodiment. FIG. 6 is an operation flow chart of a locking mechanism in the die cushion device of the press machine shown in FIG. It is an overall block diagram of the die cushioning apparatus of the press machine of 3rd Embodiment which concerns on this embodiment. FIG. 8 is an enlarged cross-sectional view of the press machine shown in FIG. It is an operation flow diagram of the locking mechanism in the die cushion device of the press machine shown in FIG. It is the die cushioning apparatus of the conventional press machine, and is the schematic sectional drawing of the die cushioning apparatus which has a locking hydraulic apparatus. It is sectional drawing of the main part of the die cushioning apparatus of the press machine described in Patent Document 1.

Next, the die cushion device of the press machine according to the embodiment of the present invention will be described in detail with reference to the drawings. First, the structure of the die cushion device of the press machine of the first embodiment according to the present embodiment will be described, and then the operation method of the locking mechanism in the die cushion device of the present press machine will be described. After that, the die cushioning apparatus of the press machines of the second embodiment and the third embodiment according to the present embodiment will be described focusing on the differences from the first embodiment.

<Structure of the die cushion device of the press machine of the first embodiment>
First, the structure of the die cushion device of the press machine of the first embodiment according to the present embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 shows an overall configuration diagram of a die cushion device of a press machine according to a first embodiment according to the present embodiment. FIG. 2 shows an enlarged cross-sectional view of the press machine shown in FIG. FIG. 3 shows a circuit configuration diagram of the cushion air air supply / exhaust means shown in FIG. FIG. 4 shows a circuit configuration diagram of the cushion air exhaust means shown in FIG. Here, in FIGS. 1 to 4, the cushion pad 2 is temporarily stopped near the bottom dead center of the slide 3, and the cushion air supply / exhaust means 22 and the cushion air exhaust means 23 are instructed to exhaust the cushion air. Represents a state.

As shown in FIGS. 1 to 4, the die cushion device 10 of the press machine of the first embodiment includes a cushion pad 2 arranged below the press machine 1 and a cushion cylinder 21 for moving the cushion pad 2 up and down. A die of a press machine 1 provided with a cushion air supply / exhaust means 22 for supplying or discharging cushion air to the cushion cylinder 21, and a locking mechanism 4 for temporarily stopping the cushion pad 2 near the bottom dead point of the slide 3. The cushion device 10. The locking mechanism 4 is housed in a pit formed below the floor surface (FL).

The press machine 1 is provided with a slide driving means 31 on the upper portion of the crown 11. The slide drive means 31 includes a drive motor (main motor) 311 (not shown), and moves the slide 3 up and down via a drive gear 312 and a connecting arm 313 connected to the drive motor 311. Further, in the press machine 1, the bolster 6 is arranged on the floor surface at a position facing the slide 3. The slide driving means 31 is provided with a slide position detecting means 41, which will be described later.

Further, for example, an upper mold 51 for drawing is fixed to the slide 3, and a lower mold 52 for drawing is fixed to the bolster 6 in cooperation with the upper mold 51. Further, a cushion pin 61 for supporting the lower ring 53 on which a wrinkle holding surface or the like is formed is inserted into the bolster 6, and the lower end of the cushion pin 61 is in contact with the cushion pad 2. Further, the cushion cylinder 21 is fixed to a pit frame or the like formed under the floor. Further, a cushion rod 24 extending downward is connected to the cushion pad 2, and a stroke adjusting means 25 of the cushion pad 2 is attached to the lower end of the cushion rod 24.

Further, the cushion air supply / exhaust means 22 includes a cushion air supply / exhaust switching valve 221, a cushion air air supply valve 222, and a cushion air exhaust valve 223. The supply / exhaust switching valve 221 is a 3-port solenoid valve provided with an air supply port, an exhaust port, and a neutral port that does not supply or exhaust air, and is electrically operated via a locking control means 43 and a control wiring 431 described later. It is connected to the. The air supply valve 222 opens and closes the air supply valve in response to a switching instruction by the pilot air of the air supply / exhaust switching valve 221 via the control pipe 225, and the exhaust valve 223 is a supply / exhaust switching valve via the control pipe 226. The exhaust valve is opened and closed in response to the switching instruction by the pilot air of 221. The air supply valve 222 and the exhaust valve 223 are connected to the cushion cylinder 21 by an air supply / exhaust pipe 224. The air supply / exhaust pipe 224 is connected to an air tank or the like (not shown) via a check valve. The check valve operates so as to release the cushion air to an air tank or the like when the cushion air of the cushion cylinder 21 reaches a pressure equal to or higher than a predetermined pressure.

Further, the locking mechanism 4 includes a slide position detecting means 41 for detecting the vertical position of the slide 3, a locking position setting means 42 for setting the slide position when locking the cushion pad 2, a slide position detecting means 41, and a slide. It includes a locking control means 43 connected to the drive means 31 and the cushion air supply / exhaust means 22.

The slide position detecting means 41 detects, for example, the angular displacement of the drive gear 312 of the slide driving means 31 by a non-contact sensor, and outputs a slide position signal. The slide position detecting means 41 is electrically connected to the locking control means 43 via the control wiring 432. An amplifier 433 that amplifies the slide position signal transmitted from the slide position detection means 41 is connected to the control wiring 432. Further, the amplifier 433 continuously outputs the slide position signal as digital information. The slide position signal set by the locking position setting means 42 is also set as digital information.

As the locking control means 43, for example, a PLC (Programmable Logic Controller) that can be used as a general-purpose control means is preferable. Since the control program can be easily rearranged and adjusted in the PLC, there is an advantage that different locking conditions can be set according to each press type. Further, the slide position when locking the cushion pad 2 is set based on molding conditions, equipment conditions, and the like. Normally, the slide position when locking the cushion pad 2 is the bottom dead center (slide angle = 180 degrees), but the brake slip when the slide is stopped, the strength of the cushion pressure, and the weight of the upper mold 51 fixed to the slide 3 , The reaction force of the lower die 52 and the lower die ring 53 are taken into consideration, and the setting is made at an arbitrary position near the bottom dead center. The slide position when locking the cushion pad 2 is set in the range of about 170 to 190 degrees according to the “slide angle” described later.

Further, the locking control means 43 stops the slide 3 with respect to the slide drive means 31 when the slide position signal received from the slide position detection means 41 matches the slide position signal set by the locking position setting means 42. It is programmed to output a signal and an exhaust signal for exhausting the cushion air to the cushion air supply / exhaust means 22.

As a result, the slide 3 is temporarily stopped based on the arbitrary slide position set by the locking position setting means 42, and the cushion air of the cushion cylinder 21 is exhausted to reduce the pressure while the slide 3 is temporarily stopped, and the cushion pad 2 is used. Can be stopped from rising. For example, the slide 3 can be lowered at a normal press speed (for example, about 15 to 18 spm) to suspend the slide 3 at an arbitrary position near the bottom dead center, and the cushion pad 2 can be locked. Therefore, in normal press molding, the temporary stop function of the cushion pad 2 can be ensured.

Further, the locking mechanism 4 is composed of a slide position detecting means 41, a locking position setting means 42, and a locking control means 43, and the slide position detecting means 41, the locking position setting means 42, and the locking control means 43 are all electrical. Since it is composed of control means, there are few problems in terms of installation space. Therefore, the locking mechanism 4 can be easily installed in the die cushion device of the existing press machine.

Here, the locking mechanism 4 includes a cushion air exhaust means 23 for discharging cushion air to the cushion cylinder 21, and the locking control means 43 receives a slide position signal from the slide position detection means 41 as a locking position setting means. When it matches the slide position signal set in 42, it is preferable to output an exhaust signal for exhausting the cushion air to the cushion air supply / exhaust means 22 and the cushion air exhaust means 23.

In this case, the cushion air can be exhausted from both the cushion air supply / exhaust means 22 and the cushion air exhaust means 23 at the same time. Therefore, the discharge time of the cushion air required for locking the cushion pad 2 can be shortened. Further, since the cushion air exhaust means 23 is composed of pipes, valves, and the like, there are few problems in terms of installation space. Therefore, the cushion air exhaust means 23 can be easily installed in the die cushion device 10 of the existing press machine.

The cushion air exhaust means 23 includes a cushion air exhaust switching valve 231 and a cushion air exhaust valve 232. The cushion air exhaust means 23 is not provided with a cushion air air supply valve. The exhaust switching valve 231 is a 3-port solenoid valve similar to the supply / exhaust switching valve 221 and is electrically connected to the locking control means 43 via the control wiring 434. The exhaust valve 232 opens and closes the exhaust valve in response to a switching instruction by the pilot air of the exhaust switching valve 231 via the control pipe 233. The exhaust valve 232 is connected to the cushion cylinder 21 by an air supply / exhaust pipe 224.

For example, when the slide 3 is stopped at the top dead center and the operation of the vertical movement of the cushion pad 2 is confirmed by each operation on the operation panel, the cushion air exhaust means 23 is not used and the cushion air supply / exhaust means is used. It is preferable to exhaust the cushion air to the cushion cylinder 21 using only 22. The reason is that when the cushion air is exhausted to the cushion cylinder 21 by using both the cushion air exhaust means 23 and the cushion air supply / exhaust means 22, the lower ring 53 and the cushion pad 2 rapidly descend. This is to avoid damage to the mold and press equipment.

Further, the locking control means 43 outputs a slide drive signal for driving the slide 3 to the slide drive means 31 after a predetermined time (for example, about 5 to 6 seconds) has elapsed after outputting the slide stop signal, and cushions the slide drive means 31. It is preferable that the air supply / exhaust means 22 and the cushion air exhaust means 23 are programmed to output an exhaust stop signal for stopping the exhaust of the cushion air.

In this case, during a predetermined time from when the slide 3 is stopped to when it is redriven, a predetermined amount of cushion air of the cushion cylinder 21 is exhausted to lock the cushion pad 2, and while the cushion pad 2 is locked. , The slide 3 can be raised to the top dead center. In addition, it is possible to prevent unnecessary exhaustion of cushion air while the slide is rising. Therefore, the locking control means 43 can easily set the ascending timing of the slide 3 only by using the timer function for counting a predetermined time, and can prevent unnecessary exhaust of the cushion air while the slide 3 is ascending. can.

Further, during a predetermined time from the output of the slide stop signal to the output of the slide drive signal by the locking control means 43, the cushion air of the cushion cylinder 21 is exhausted up to the upper limit air pressure that can maintain the locking state of the cushion pad 2. It is preferable that it is time to do.

In this case, the amount of cushion air exhausted from the cushion cylinder 21 can be minimized in order to lock the cushion pad 2, and the cushion air supplied to the cushion cylinder 21 is supplied in order to raise the cushion pad 2 after locking. The amount can be minimized. Further, since the displacement of the cushion air exhausted from the cushion cylinder 21 can be minimized in order to lock the cushion pad 2, it is possible to minimize the time for suspending the slide 3 with the locking of the cushion pad 2. .. This can also contribute to the improvement of the productivity of the press machine 1.

Further, in the slide position detecting means 41, it is preferable to detect the slide angle as the vertical position of the slide 3 via the drive gear 312 interlocked with the drive motor 311 of the slide drive means 31. As a result, the slide angle signal of the slide angle reader provided in the existing press machine can be diverted, and the slide angle can be easily acquired as the vertical position information of the slide without adding a special detecting means. The "slide angle" is represented by the central angle with respect to the perpendicular line passing through the center of the circumference when the slide 3 rotates clockwise on the circumference, and the slide angle is 0 degrees at the position of the top dead point of the slide 3. At the position where the slide 3 is the bottom dead point, the slide angle is 180 degrees.

Further, in the locking position setting means 42, it is preferable to set the slide position when locking the cushion pad 2 by the slide angle. This makes it possible to easily set the slide angle when locking the cushion pad 2 on the operation panel of the existing press machine.

Further, the locking control means 43 stops the slide 3 with respect to the slide drive means 31 when the slide angle signal received from the slide position detection means 41 matches the slide angle signal set by the locking position setting means 42. It is preferable that the signal is output and the cushion air supply / exhaust means 22 (and the cushion air exhaust means 23) are programmed to output an exhaust signal for exhausting the cushion air. In this case, the cushion pad 2 can be locked at an arbitrary slide position by the slide angle signal that can be acquired and set more easily.

<Operation method of locking mechanism in the first embodiment>
Next, the operation method of the locking mechanism in the first embodiment will be described with reference to FIGS. 1 to 5. FIG. 5 shows an operation flow chart of a locking mechanism in the die cushion device of the press machine shown in FIG.

As shown in FIGS. 1 to 5, first, the slide 3 descends from the top dead center to the bottom dead center (step S1). The lowering operation of the slide 3 is performed by operating the drive motor 311 of the slide drive means 31. The slide 3 descends, for example, at a normal press speed (for example, about 15 to 18 spm). Further, an upper die 51 for drawing is fixed to the slide 3, and a lower die 52 having a lower die ring 53 is fixed to the bolster 6. At this time, the lower ring 53 is supported at a predetermined rising position by the cushion pad 2 and the cushion pin 61.

Next, as the slide 3 descends, the upper mold 51 presses the lower mold ring 53, and the cushion pad 2 pressed by the lower mold ring 53 descends (step S2). At this stage, the cushion cylinder 21 is supplied with cushion air pressurized at a predetermined air pressure from an air tank (not shown). Therefore, a predetermined frictional force based on the applied pressure of the cushion air acts on the material sandwiched between the upper mold 51 and the lower mold ring 53, and the inflow of the material is controlled.

Next, when the slide 3 descends to the vicinity of the bottom dead point and the slide angle signal from the slide position detection means 41 and the slide angle signal set by the locking position setting means 42 match, the locking control means 43 determines. An instruction to stop the slide and an instruction to exhaust the cushion air are given (step S3). The slide stop instruction is given to the slide drive means 31, and the cushion air exhaust instruction is given to the cushion air supply / exhaust means 22 (and the cushion air exhaust means 23). As a result, the slide 3 is stopped, and the cushion pad 2 is also stopped at the same time. The air pressure of the cushion cylinder 21 gradually decreases due to the exhaust of the cushion air, but at the start of the exhaust of the cushion air, the cushion pad is stopped at the same time as the slide 3 is stopped against the weight and inertial force of the cushion pad 2. 2 can be stopped.

Next, the locking control means 43 gives a slide drive instruction and a cushion air exhaust stop instruction after a predetermined time has elapsed from the slide stop instruction (step S4). As a result, the slide 3 rises to the top dead center. On the other hand, the air pressure of the cushion cylinder 21 is maintained at present because the exhaust of the cushion air is stopped. Therefore, the cushion pad 2 stops at the locked position and does not rise.

Next, when the slide 3 reaches the top dead center, or after that, the locking control means 43 gives a cushion air supply instruction (step S5). The cushion air supply instruction is given to the cushion air supply / exhaust means 22. As a result, the locked cushion pad 2 rises to a predetermined rising position. As a result, it is possible to release the pressed product from the lower mold 52 while avoiding biting into the upper mold 51 after molding.

<Structure of the die cushion device of the press machine of the second embodiment>
Next, the structure of the die cushion device of the press machine of the second embodiment according to the present embodiment will be described with reference to FIGS. 3, 4, and 6. FIG. 6 shows an overall configuration diagram of the die cushion device of the press machine of the second embodiment according to the present embodiment. Here, FIG. 6 shows a state in which the cushion pad 2 is temporarily stopped near the bottom dead center of the slide 3 and the cushion air supply / exhaust means 22 and the cushion air exhaust means 23 are instructed to exhaust the cushion air. ..

As shown in FIGS. 3, 4, and 6, the die cushion device 10B of the press machine of the second embodiment has a cushion pad 2 arranged below the press machine 1 and a cushion that moves the cushion pad 2 up and down. A press machine provided with a cylinder 21, a cushion air supply / exhaust means 22 for supplying or discharging cushion air to the cushion cylinder 21, and a locking mechanism 4B for temporarily stopping the cushion pad 2 near the bottom dead center of the slide 3. Die cushion device 10B. Here, the points different from those of the first embodiment will be mainly described, the common configurations will be designated by a common reference numeral, and the description thereof will be omitted in principle.

That is, in the die cushion device 10B of the press machine of the second embodiment, the locking mechanism 4B has the cushion pressure detecting means 44 for detecting the air pressure of the cushion cylinder 21 and the upper limit capable of holding the locking state of the cushion pad 2. It is provided with a locking holding pressure setting means 45 for presetting the air pressure of the above. Here, the "upper limit air pressure" means the air pressure immediately before the cushion pad 2 starts to rise from the descending position while maintaining the locking state of the cushion pad 2.

The cushion pressure detecting means 44 can use a pressure sensor attached to the air supply / exhaust pipe 224 connected to the cushion cylinder 21. The pressure sensor is preferably one that can detect a change in air pressure quickly and accurately, for example, a thin film type pressure sensor that detects a change in electrical resistance generated by distortion of a gauge thin film formed on a diaphragm. Further, it is preferable that the locking holding pressure setting means 45 can set the air pressure for each press mold to be used. For example, the locking holding pressure setting means 45 links the press type control number and the set air pressure, and when the press type control number is input, the air pressure corresponding to the press type can be automatically input. You may.

Further, the locking control means 43 drives the slide 3 with respect to the slide drive means 31 when the air pressure signal received from the cushion pressure detecting means 44 and the air pressure signal set by the locking holding pressure setting means 45 match. It is programmed to output a drive signal and output an exhaust stop signal to the cushion air supply / exhaust means 22 (and the cushion air exhaust means 23) to stop the exhaust of the cushion air.

Therefore, it is possible to raise the slide 3 by confirming that the air pressure of the cushion cylinder 21 has been reduced to the upper limit air pressure that can hold the locking state of the cushion pad 2. Therefore, when the slide 3 is raised, it can be surely avoided that the cushion pad 2 is also raised, and the pause accuracy in the locking of the cushion pad 2 can be further improved. Further, since the locking control means 43 outputs the slide drive signal and the exhaust stop signal at the same time, it is possible to suppress excessive exhaust of the cushion air to the cushion cylinder 21. Therefore, the refilling time of the cushion air for the cushion cylinder 21 can be shortened, and the restart time until the slide 3 reaches the top dead center and then descends again can be shortened.

<Operation method of locking mechanism in the second embodiment>
Next, the operation method of the locking mechanism in the second embodiment will be described with reference to FIGS. 6 and 7. FIG. 7 shows an operation flow chart of the locking mechanism in the die cushion device of the press machine shown in FIG.

As shown in FIGS. 6 and 7, first, the slide 3 descends from the top dead center to the bottom dead center (step S11). Next, as the slide 3 descends, the upper mold 51 presses the lower mold ring 53, and the cushion pad 2 pressed by the lower mold ring 53 descends (step S12). Next, when the slide 3 descends to the vicinity of the bottom dead point and the slide angle signal from the slide position detection means 41 and the slide angle signal set by the locking position setting means 42 match, the locking control means 43 determines. An instruction to stop the slide and an instruction to exhaust the cushion air are given (step S13). The above steps S11 to S13 are common to the first embodiment.

Next, when the locking control means 43 matches the air pressure signal of the cushion pressure detecting means 44 with the air pressure signal preset by the locking holding pressure setting means 45, the locking control means 43 gives a slide drive instruction and gives a cushion air exhaust stop instruction. (Step S14). As a result, the slide 3 can be raised by confirming that the air pressure of the cushion cylinder 21 has been reduced to the upper limit air pressure that can hold the locking state of the cushion pad 2. In addition, excessive exhaust of cushion air to the cushion cylinder 21 can be suppressed.

Next, when the slide 3 reaches the top dead center, or after that, the locking control means 43 gives a cushion air supply instruction (step S15). As a result, the locked cushion pad 2 rises to a predetermined rising position. As a result, it is possible to release the pressed product from the lower mold 52 while avoiding biting into the upper mold 51 after molding. This step S15 is common to the first embodiment.

<Structure of the die cushion device of the press machine of the third embodiment>
Next, the structure of the die cushion device of the press machine of the third embodiment according to the present embodiment will be described with reference to FIGS. 3, 4, 8 and 9. FIG. 8 shows an overall configuration diagram of a die cushion device of a press machine according to a third embodiment according to the present embodiment. FIG. 9 shows an enlarged cross-sectional view of the press machine shown in FIG. Here, in FIGS. 8 and 9, the cushion pad 2 is temporarily stopped near the bottom dead center of the slide 3, and the cushion air air supply / exhaust means 22 and the cushion air exhaust means 23 are instructed to exhaust the cushion air. Represents a state.

As shown in FIGS. 3, 4, 8, and 9, the die cushion device 10C of the press machine of the third embodiment raises and lowers the cushion pad 2 arranged below the press machine 1 and the cushion pad 2. A cushion cylinder 21 to be moved, a cushion air supply / exhaust means 22 for supplying or discharging cushion air to the cushion cylinder 21, and a locking mechanism 4C for temporarily stopping the cushion pad 2 near the bottom dead point of the slide 3 are provided. It is a die cushion device 10C of a press machine. Here, the points different from those of the first embodiment will be mainly described, the common configurations will be designated by a common reference numeral, and the description thereof will be omitted in principle.

That is, in the die cushion device 10C of the press machine of the third embodiment, the locking mechanism 4C has a slide position detecting means 41 for detecting the vertical position of the slide 3 and a slide position for locking the cushion pad 2 in advance. The locking position setting means 42 to be set, the cushion height detecting means 46 for detecting the rising height of the cushion pad 2 with respect to the descending position as the cushion height, and the slide driving means 31 for driving the slide position detecting means 41 and the slide 3. It includes a cushion air supply / exhaust means 22 and a locking control means 43 connected to the cushion height detecting means 46.

In the cushion height detecting means 46, for example, the main body is fixed to the side wall of the cushion pad 2, and the displacement rod 461 extending in the vertical direction from the main body is in contact with the bracket 462 extending horizontally from the cushion cylinder 21. A linear displacement detector can be used. The cushion height detecting means 46 can be easily installed in the die cushion device of an existing press machine. Further, the cushion height detecting means 46 detects the amount of displacement of the displacement rod 461 with respect to the bracket 462 as an ascending height with respect to the descending position of the cushion pad 2, and outputs a cushion height signal. The cushion height detecting means 46 is electrically connected to the locking control means 43 via the control wiring 437. An amplifier 436 that amplifies the cushion height signal transmitted from the cushion height detecting means 46 is connected to the control wiring 437. Further, the amplifier 436 continuously outputs the cushion height signal as digital information.

Further, when the cushion height signal received from the cushion height detecting means 46 indicates zero mm, the locking control means 43 outputs a slide stop signal to the slide driving means 31 and receives a slide position from the slide position detecting means 41. When the signal matches the slide position signal set by the locking position setting means 42, it is programmed to output an exhaust signal for exhausting the cushion air to the cushion air supply / exhaust means 22 (and the cushion air exhaust means 23). ing.

As a result, it is possible to confirm that the cushion pad 2 has arrived at the lowered position and temporarily stop the slide 3. Further, based on an arbitrary slide position set by the locking position setting means 42, the cushion air of the cushion cylinder 21 can be exhausted to reduce the pressure, and the ascending can be stopped at the descending position of the cushion pad 2. Therefore, for example, the slide 3 can be lowered at a normal press speed (for example, about 15 to 18 spm) to suspend the slide 3 at the lowered position of the cushion pad 2 and lock the cushion pad 2 at the lowered position. can. As a result, it is possible to stably secure the temporary stop function at the lowered position of the cushion pad 2 in a state where the molding touch speed at the normal press speed is secured.

Further, in the die cushion device 10C of the press machine of the third embodiment, the locking mechanism 4C has a cushion pressure detecting means 44 for detecting the air pressure of the cushion cylinder 21 and an upper limit capable of holding the locking state of the cushion pad 2. The locking holding pressure setting means 45 for presetting the air pressure of the above is provided, and the locking control means 43 matches the air pressure signal received from the cushion pressure detecting means 44 with the air pressure signal set by the locking holding pressure setting means 45. At this time, a slide drive signal for driving the slide 3 is output to the slide drive means 31, and an exhaust stop signal for stopping the exhaust of the cushion air is output to the cushion air supply / exhaust means 22 and the cushion air exhaust means 23. Is preferable.

In this case, it is possible to raise the slide 3 by confirming that the air pressure of the cushion cylinder 21 has been reduced to the upper limit air pressure that can hold the locking state of the cushion pad 2. Therefore, when the slide 3 is raised, it is possible to prevent the cushion pad 2 from being raised at the same time, and it is possible to further improve the pause accuracy in the locking of the cushion pad 2. Further, since the locking control means 43 outputs the slide drive signal and the exhaust stop signal at the same time, it is possible to suppress excessive exhaust of the cushion air to the cushion cylinder 21. Therefore, the refilling time of the cushion air for the cushion cylinder 21 can be shortened, and the restart time until the slide 3 reaches the top dead center and then descends again can be shortened.

Further, in the die cushion device 10C of the press machine of the third embodiment, the locking control means 43 refers to the slide drive means 31 when the cushion height signal received from the cushion height detecting means 46 exceeds zero mm. It is preferable to output a slide stop signal and reset the upper limit air pressure that can hold the locking state of the cushion pad 2 set in the locking holding pressure setting means 45 based on the air pressure signal of the cushion pressure detecting means 44.

In this case, from the next press molding, a slide drive signal for driving the slide 3 is output to the slide drive means 31 at the upper limit air pressure that can hold the locked state of the reset cushion pad 2, and the slide is performed. 3 can be raised earlier. Therefore, the restart time of the slide 3 can be further shortened.

Further, in the die cushion device 10C of the press machine of the third embodiment, the locking mechanism 4C displays a one-cycle waveform of the cushion height based on the cushion height signal received from the cushion height detecting means 46. It is preferable that the locking control means 43 includes the display means 47 and outputs a display signal for displaying a one-cycle waveform to the cushion height display means 47 when the cushion pad 2 reaches the ascending position. In the one-cycle waveform of the cushion height, the cushion pad 2 descends from the ascending position as the slide 3 descends, temporarily stops at the descending position, and then ascends to the ascending position and stops. The motion trajectory is displayed as an image, and it is preferable that the motion trajectory is formed so as to be comparable to the past waveform.

In this case, it is possible to know in detail the operation loci of the lowering and ascending of the cushion pad 2 in the press forming process. Therefore, the upper limit air pressure that can hold the locked state of the cushion pad 2 can be grasped more accurately. For example, an abnormal height when the cushion pad 2 is raised, a variation in the lowered position of the cushion pad 2, and the like can be detected. Since it can be recognized, it is possible to analyze the causal relationship between the press molding quality and the operation of the cushion pad 2. As a result, it can contribute to early stabilization of press molding quality.

<Operation method of locking mechanism in the third embodiment>
Next, the operation method of the locking mechanism in the third embodiment will be described with reference to FIGS. 8 to 10. FIG. 10 shows an operation flow chart of a locking mechanism in the die cushion device of the press machine shown in FIG.

As shown in FIGS. 8 to 10, first, the slide 3 descends from the top dead center to the bottom dead center (step S21). Next, as the slide 3 descends, the upper mold 51 presses the lower mold ring 53, and the cushion pad 2 pressed by the lower mold ring 53 descends (step S22). The above steps S21 and S22 are common to the first embodiment.

Next, when the slide 3 descends to the vicinity of the bottom dead point and the slide angle signal from the slide position detection means 41 and the slide angle signal preset by the locking position setting means 42 match, the locking control means 43 determines. The cushion air exhaust instruction is given (step S23). The cushion air exhaust instruction is given to the cushion air supply / exhaust means 22 (and the cushion air exhaust means 23). At this stage, the stop instruction of the slide 3 is not output, but the air pressure of the cushion cylinder 21 is in equilibrium with the pushing pressure from the slide 3 and the inertial force due to the weight of the cushion pad 2 due to the exhaust of the cushion air. It drops to pressure.

Next, when the cushion height signal from the cushion height detecting means 46 reaches 0 mm, the locking control means 43 gives a slide stop instruction to the slide driving means 31 (step S24). As a result, the slide 3 is stopped at the lowered position of the cushion pad 2. Then, when the slide 3 is stopped, the cushion pad 2 is stopped. That is, based on an arbitrary slide position set by the locking position setting means 42, the cushion air of the cushion cylinder 21 is exhausted and depressurized prior to the stop of the slide 3, so that the cushion pad 2 is in the lowered position. The slide 3 and the cushion pad 2 can be stopped at the same time.

Next, it is confirmed whether or not the cushion height signal has risen above 0 mm (step S25), and if it does not rise, the air pressure signal from the cushion pressure detecting means 44 and the locking holding pressure setting means 45 have set in advance. When the air pressure signal matches, the locking control means 43 issues a slide drive instruction and a cushion air exhaust stop instruction (step S26). As a result, the slide 3 can be raised by confirming that the air pressure of the cushion cylinder 21 has been reduced to the upper limit air pressure that can hold the locking state of the cushion pad 2. In addition, excessive exhaust of cushion air to the cushion cylinder 21 can be suppressed.

Next, when the slide 3 reaches the top dead center, or after that, the locking control means 43 gives a cushion air supply instruction (step S28). As a result, the locked cushion pad 2 rises to a predetermined rising position. As a result, it is possible to release the pressed product from the lower mold 52 while avoiding biting into the upper mold 51 after molding. This step S28 is common to the first embodiment.

It is confirmed whether or not the cushion height signal has risen above 0 mm (step S25), and if it has risen, an instruction to stop the cushion air exhaust is immediately given. Then, the air pressure set by the locking holding pressure setting means 45 is reset based on the air pressure signal of the cushion pressure detecting means 44 at that time (S27). The method of resetting the air pressure set by the locking holding pressure setting means 45 may be an automatic setting by the locking control means 43 or a manual setting by the operator. Then, the process returns to step S25. As a result, from the next press molding, the slide drive signal can be output and the slide 3 can be raised earlier at the upper limit air pressure that can hold the locked state of the cushion pad 2 that has been reset.

<Action effect>
As described above in detail, according to the die cushion devices 10 and 10B of the press machine according to the present embodiment, the locking mechanisms 4 and 4B include a slide position detecting means 41 for detecting the vertical position of the slide 3 and a slide position detecting means 41. Locking control connected to the locking position setting means 42 that presets the slide position when locking the cushion pad 2, the slide drive means 31 that drives the slide position detecting means 41 and the slide 3, and the cushion air air supply / exhaust means 22. The locking control means 43 includes the means 43, and the locking control means 43 slides 3 with respect to the slide drive means 31 when the slide position signal received from the slide position detecting means 41 matches the slide position signal set by the locking position setting means 42. Since the slide stop signal for stopping the cushion air and the exhaust signal for exhausting the cushion air to the cushion air supply / exhaust means 22 are output, the slide 3 is temporarily stopped based on an arbitrary slide position set by the locking position setting means 42. At the same time as stopping, the cushion air of the cushion cylinder 21 can be exhausted to reduce the pressure while the slide 3 is temporarily stopped, and the ascending of the cushion pad 2 can be stopped. Therefore, for example, the slide 3 can be lowered at a normal press speed (for example, about 15 to 18 spm), the slide 3 can be temporarily stopped at an arbitrary position near the bottom dead center, and the cushion pad 2 can be locked. As a result, the temporary stop function of the cushion pad 2 can be secured while the molding touch speed at the normal press speed is secured.

Further, the locking mechanisms 4 and 4B are composed of a slide position detecting means 41, a locking position setting means 42, and a locking control means 43, and the slide position detecting means 41, the locking position setting means 42, and the locking control means 43 are all included. Since it is composed of electrical control means, there are few problems in terms of installation space. Therefore, the locking mechanisms 4 and 4B can be easily installed in the die cushion device of the existing press machine.

Therefore, according to the present embodiment, the die cushion device 10 of the press machine provided with the locking mechanisms 4 and 4B, which can be easily installed in the die cushion device of the existing press machine and easily secure the primary stop function of the cushion pad 2. 10B can be provided.

Further, according to the present embodiment, the locking control means 43 outputs a slide drive signal for driving the slide 3 to the slide drive means 31 after a lapse of a predetermined time after outputting the slide stop signal, and supplies cushion air. Since an exhaust stop signal for stopping the exhaust of the cushion air is output to the exhaust means 22, a predetermined amount of the cushion air of the cushion cylinder 21 is exhausted during a predetermined time from the stop of the slide 3 to the restart. , The cushion pad 2 can be locked, and the slide 3 can be raised to the top blind point while the cushion pad 2 is locked. Further, when the slide 3 is raised to the top dead center, the exhaust of the cushion air can be stopped. Therefore, the locking control means 43 can easily set the ascending timing of the slide 3 only by using the timer function for counting a predetermined time, and can prevent unnecessary exhaust of the cushion air while the slide 3 is ascending. can.

Therefore, according to the present embodiment, it can be easily installed in the die cushion device of an existing press machine, the temporary stop function of the cushion pad 2 is secured by using a simple timer function, and unnecessary exhaust of the cushion air is prevented. Die cushioning devices 10 and 10B of a press machine provided with locking mechanisms 4 and 4B can be provided.

Further, according to the present embodiment, the predetermined time from the output of the slide stop signal to the output of the slide drive signal by the locking control means 43 is cushioned up to the upper limit air pressure capable of holding the locked state of the cushion pad 2. Since it is time to exhaust the cushion air of the cylinder 21, the amount of cushion air exhausted from the cushion cylinder 21 can be minimized in order to lock the cushion pad 2, and the cushion pad 2 can be raised after locking. The amount of cushion air supplied to the cushion cylinder 21 can be minimized. Further, since the displacement of the cushion air exhausted from the cushion cylinder 21 can be minimized in order to lock the cushion pad 2, it is possible to minimize the time for suspending the slide 3 with the locking of the cushion pad 2. ..

Therefore, according to the present embodiment, a locking mechanism that can be easily installed in the die cushion device of an existing press machine and can minimize the amount of cushion air discharged for locking the cushion pad 2 and the pause time of the slide 3. It is possible to provide the die cushion device 10 of the press machine provided with 4.

Further, according to the present embodiment, the locking mechanism 4B has a cushion pressure detecting means 44 that detects the air pressure of the cushion cylinder 21 and a locking that presets an upper limit air pressure that can hold the locked state of the cushion pad 2. The locking control means 43 includes a holding pressure setting means 45, and when the air pressure signal from the cushion pressure detecting means 44 and the air pressure signal set by the locking holding pressure setting means 45 match, the locking control means 43 sets the slide drive means 31. On the other hand, a slide drive signal for driving the slide 3 is output, and an exhaust stop signal for stopping the exhaust of the cushion air is output to the cushion air supply / exhaust means 22, so that the air pressure of the cushion cylinder 21 locks the cushion pad 2. The slide 3 can be raised after confirming that the air pressure has been reduced to the upper limit that can maintain the state. Therefore, when the slide 3 is raised, it can be surely avoided that the cushion pad 2 is also raised, and the pause accuracy in the locking of the cushion pad 2 can be further improved. Further, since the locking control means 43 outputs the slide drive signal and the exhaust stop signal at the same time, it is possible to suppress excessive exhaust of the cushion air to the cushion cylinder 21. Therefore, the refilling time of the cushion air for the cushion cylinder 21 can be shortened, and the restart time until the slide 3 reaches the top dead center and then descends again can be shortened.

Therefore, according to the present embodiment, a locking mechanism 4B that can be easily installed in the die cushion device of an existing press machine and can shorten the restart time of the slide 3 while improving the pause accuracy of the cushion pad 2 is provided. A die cushion device 10B for a press machine can be provided.

Further, according to the present embodiment, the locking mechanism 4C includes a slide position detecting means 41 for detecting the vertical position of the slide 3 and a locking position setting means 42 for setting the slide position when locking the cushion pad 2 in advance. The cushion height detecting means 46 that detects the rising height of the cushion pad 2 with respect to the lowered position as the cushion height, the slide position detecting means 41, the slide driving means 31 that drives the slide 3, the cushion air supply / exhaust means 22, and the cushion. The locking control means 43 is provided with a locking control means 43 connected to the height detecting means 46, and the locking control means 43 refers to the slide driving means 31 when the cushion height signal received from the cushion height detecting means 46 indicates zero mm. When the slide position signal received from the slide position detecting means 41 matches the slide position signal set by the locking position setting means 42, the cushion air is exhausted to the cushion air supply / exhaust means 22. Since the signal is output, it is possible to confirm that the cushion pad 2 has arrived at the descending position and temporarily stop the slide 3. Further, based on an arbitrary slide position set by the locking position setting means 42, the cushion air of the cushion cylinder 21 can be exhausted to reduce the pressure, and the ascending can be stopped at the descending position of the cushion pad 2. Therefore, for example, the slide 3 can be lowered at a normal press speed (for example, about 15 to 18 spm) to suspend the slide 3 at the lowered position of the cushion pad 2 and lock the cushion pad 2 at the lowered position. can. As a result, it is possible to stably secure the temporary stop function at the lowered position of the cushion pad 2 in a state where the molding touch speed at the normal press speed is secured.

Further, the locking mechanism 4C is composed of a slide position detecting means 41, a locking position setting means 42, a cushion height detecting means 46, and a locking control means 43, and includes a slide position detecting means 41, a locking position setting means 42, and a locking control means. Since all 43 are composed of electrical control means and the like, there are few problems in terms of installation space. Further, the cushion height detecting means 46 can be easily installed, for example, between the side wall of the cushion pad 2 and the cushion cylinder 21. Therefore, the locking mechanism 4C can be easily installed in the die cushion device of the existing press machine.

Therefore, according to the present embodiment, the die of the press machine provided with the locking mechanism 4C, which can be easily installed in the die cushion device of the existing press machine and can easily secure the temporary stop function at the lowered position of the cushion pad 2 in a stable manner. Cushion device 10C can be provided.

Further, according to the present embodiment, the locking mechanism 4C has a cushion pressure detecting means 44 that detects the air pressure of the cushion cylinder 21 and a locking that presets an upper limit air pressure that can hold the locked state of the cushion pad 2. The locking control means 43 includes a holding pressure setting means 45, and when the air pressure signal received from the cushion pressure detecting means 44 and the air pressure signal set by the locking holding pressure setting means 45 match, the locking control means 43 sets the slide drive means 31. On the other hand, a slide drive signal for driving the slide 3 is output, and an exhaust stop signal for stopping the exhaust of the cushion air is output to the cushion air supply / exhaust means 22, so that the air pressure of the cushion cylinder 21 locks the cushion pad 2. The slide 3 can be raised after confirming that the air pressure has been reduced to the upper limit that can maintain the state. Therefore, when the slide 3 is raised, it is possible to prevent the cushion pad 2 from being raised at the same time, and it is possible to further improve the pause accuracy in the locking of the cushion pad 2. Further, since the locking control means 43 outputs the slide drive signal and the exhaust stop signal at the same time, it is possible to suppress excessive exhaust of the cushion air to the cushion cylinder 21. Therefore, the refilling time of the cushion air for the cushion cylinder 21 can be shortened, and the restart time until the slide 3 reaches the top dead center and then descends again can be shortened.

Therefore, according to the present embodiment, a locking mechanism 4C that can be easily installed in the die cushion device of an existing press machine and can shorten the restart time of the slide 3 while improving the pause accuracy of the cushion pad 2 is provided. A die cushion device 10C for a press machine can be provided.

Further, according to the present embodiment, when the cushion height signal received from the cushion height detecting means 46 exceeds zero mm, the locking control means 43 outputs a slide stop signal to the slide driving means 31 and locks. Since the upper limit air pressure that can hold the locking state of the cushion pad 2 set in the holding pressure setting means 45 is reset based on the air pressure signal of the cushion pressure detecting means 44, it is reset from the next press molding. At the upper limit air pressure that can hold the locking state of the cushion pad 2, a slide drive signal for driving the slide 3 can be output to the slide drive means 31 to raise the slide 3 earlier. Therefore, the restart time of the slide 3 can be further shortened.

Therefore, according to the present embodiment, the slide 3 can be easily installed in the die cushion device of the existing press machine, the slide 3 is raised by the upper limit air pressure capable of holding the locking state of the cushion pad 2, and the slide 3 is restarted. It is possible to provide a die cushion device 10C of a press machine provided with a locking mechanism 4C that can further reduce the time.

Further, according to the present embodiment, the locking mechanism 4C is provided with a cushion height display means 47 that displays a one-cycle waveform of the cushion height based on the cushion height signal received from the cushion height detecting means 46, and is locked. When the cushion pad 2 reaches the ascending position, the control means 43 outputs a display signal for displaying a one-cycle waveform to the cushion height displaying means 47, so that the cushion pad 2 is lowered or raised in the press molding process. You can know the operation trajectory in detail. Therefore, the upper limit air pressure that can hold the locked state of the cushion pad 2 can be grasped more accurately. For example, an abnormal height when the cushion pad 2 is raised, a variation in the lowered position of the cushion pad 2, and the like can be detected. Since it can be recognized, it is possible to analyze the causal relationship between the press forming quality and the cushioning operation. As a result, it can contribute to early stabilization of press molding quality.

Therefore, according to the present embodiment, the locking mechanism 4C is provided, which can be easily installed in the die cushion device of an existing press machine, and can easily secure the press molding quality in a shorter period of time by grasping the operation locus of the cushion pad 2. A die cushion device 10C for a press machine can be provided.

Further, according to the present embodiment, the locking mechanisms 4, 4B and 4C are provided with cushion air exhaust means 23 for discharging cushion air to the cushion cylinder 21, and the locking control means 43 is from the slide position detecting means 41. When the received slide position signal matches the slide position signal set by the locking position setting means 42, an exhaust signal for exhausting the cushion air is output to the cushion air exhaust means 23, so that the cushion air is exhausted to the cushion air. It can be performed simultaneously from both the air supply / exhaust means 22 and the cushion air exhaust means 23. Therefore, the discharge time of the cushion air required for locking the cushion pad 2 can be shortened. Further, since the cushion air exhaust means 23 is composed of pipes, valves, and the like, there are few problems in terms of installation space. Therefore, the cushion air exhaust means 23 can be easily installed in the die cushion device of the existing press machine.

Therefore, according to the present embodiment, the press machine provided with the locking mechanisms 4, 4B and 4C which can be easily installed in the die cushion device of the existing press machine and can easily secure the temporary stop function of the cushion pad 2 in a shorter time. The die cushion devices 10, 10B and 10C of the above can be provided.

Further, according to the present embodiment, the slide position detecting means 41 detects the slide angle as the vertical position of the slide 3 via the drive gear 312 interlocked with the drive motor 311 of the slide drive means 31, and the locking position setting means 42. Then, since the slide position when locking the cushion pad 2 is set by the slide angle, the slide angle signal of the slide angle reader provided in the existing press machine can be diverted, and a special detection means is added. Instead, the slide angle can be easily obtained as the vertical position information of the slide 3. Further, in the locking position setting means 42, the slide position when locking the cushion pad 2 is set by the slide angle, so that the slide angle when locking the cushion pad 2 on the operation panel of the existing press machine can be easily set. be able to.

Therefore, according to the present embodiment, the locking mechanism 4 that secures the temporary stop function of the cushion pad 2 by using the slide angle signal that can be easily installed in the die cushion device of the existing press machine and can be more easily acquired and set. Die cushioning devices 10, 10B and 10C of a press machine provided with 4B and 4C can be provided.

INDUSTRIAL APPLICABILITY The present invention can be used as a die cushion device for a press machine provided with a locking mechanism for suspending the cushion pad of the press machine near the bottom dead center of the slide.

1 Press machine 2 Cushion pad 3 Slide 4, 4B, 4C Locking mechanism 10, 10B, 10C Die cushion device 21 Cushion cylinder 22 Cushion air supply / exhaust means 23 Cushion air exhaust means 31 Slide drive means 41 Slide position detection means 42 Locking position setting Means 43 Locking control means 44 Cushion pressure detecting means 45 Locking holding pressure setting means 46 Cushion height detecting means 47 Cushion height display means 311 Drive motor 312 Drive gear

Claims (10)

A cushion pad arranged below the press machine, a cushion cylinder for moving the cushion pad up and down, a cushion air supply / exhaust means for supplying or discharging cushion air to the cushion cylinder, and a cushion pad under the slide. It is a die cushion device of a press machine equipped with a locking mechanism that temporarily stops near the dead center.
The locking mechanism includes
A slide position detecting means for detecting the vertical position of the slide, and
A locking position setting means for presetting a slide position when locking the cushion pad, and a locking position setting means.
The slide position detecting means, the slide driving means for driving the slide, and the locking control means connected to the cushion air air supply / exhaust means are provided.
When the slide position signal received from the slide position detecting means matches the slide position signal set by the locking position setting means, the locking control means sends a slide stop signal for suspending the slide to the slide driving means. A die cushion device for a press machine, which outputs an exhaust signal to the cushion air supply / exhaust means to exhaust the cushion air. In the die cushion device of the press machine according to claim 1,
The locking control means outputs a slide drive signal for driving the slide to the slide drive means after a lapse of a predetermined time after outputting the slide stop signal, and the cushion air supply / exhaust means to the cushion air supply / exhaust means. A die cushioning device for press machines characterized by outputting an exhaust stop signal that stops the exhaust of air. In the die cushion device of the press machine according to claim 2.
The predetermined time from the output of the slide stop signal to the output of the slide drive signal by the locking control means is the cushion air of the cushion cylinder up to the upper limit air pressure capable of holding the locked state of the cushion pad. A die cushioning device for press machines, characterized in that it is time to exhaust. In the die cushion device of the press machine according to claim 1,
The locking mechanism includes a cushion pressure detecting means for detecting the air pressure of the cushion cylinder and a locking holding pressure setting means for presetting an upper limit air pressure capable of holding the locked state of the cushion pad.
The locking control means is a slide drive signal for driving the slide with respect to the slide drive means when the air pressure signal received from the cushion pressure detecting means and the air pressure signal set by the locking holding pressure setting means match. A die cushion device of a press machine, which outputs an exhaust stop signal for stopping the exhaust of the cushion air to the cushion air supply / exhaust means. A cushion pad arranged below the press machine, a cushion cylinder for moving the cushion pad up and down, a cushion air supply / exhaust means for supplying or discharging cushion air to the cushion cylinder, and a cushion pad under the slide. It is a die cushion device of a press machine equipped with a locking mechanism that temporarily stops near the dead center.
The locking mechanism includes
A slide position detecting means for detecting the vertical position of the slide, and
A locking position setting means for presetting a slide position when locking the cushion pad, and a locking position setting means.
A cushion height detecting means for detecting the ascending height of the cushion pad with respect to the descending position as the cushion height,
The slide position detecting means, the slide driving means for driving the slide, the cushion air supply / exhaust means, and the locking control means connected to the cushion height detecting means are provided.
When the cushion height signal received from the cushion height detecting means indicates zero mm, the locking control means outputs a slide stop signal to the slide driving means, and the slide position signal received from the slide position detecting means is received. A die cushion device for a press machine, characterized in that an exhaust signal for exhausting the cushion air is output to the cushion air supply / exhaust means when the slide position signal matches the slide position signal set by the locking position setting means. In the die cushion device of the press machine according to claim 5.
The locking mechanism includes a cushion pressure detecting means for detecting the air pressure of the cushion cylinder and a locking holding pressure setting means for presetting an upper limit air pressure capable of holding the locked state of the cushion pad.
The locking control means is a slide drive signal for driving the slide with respect to the slide drive means when the air pressure signal received from the cushion pressure detecting means and the air pressure signal set by the locking holding pressure setting means match. A die cushion device of a press machine, which outputs an exhaust stop signal for stopping the exhaust of the cushion air to the cushion air supply / exhaust means. In the die cushion device of the press machine according to claim 6.
When the cushion height signal received from the cushion height detecting means exceeds zero mm, the locking control means outputs a slide stop signal to the slide driving means, and the locking holding pressure setting means sets the same. A die cushion device for a press machine, characterized in that an upper limit air pressure capable of holding a locking state of a cushion pad is reset based on an air pressure signal of the cushion pressure detecting means. In the die cushion device of the press machine according to any one of claims 5 to 7.
The locking mechanism includes a cushion height display means that displays a one-cycle waveform of the cushion height based on a cushion height signal received from the cushion height detecting means.
The locking control means is a die cushion device of a press machine, characterized in that when the cushion pad reaches an ascending position, a display signal for displaying the one-cycle waveform is output to the cushion height display means. In the die cushion device of the press machine according to any one of claims 1 to 8.
The locking mechanism includes a cushion air exhaust means for discharging the cushion air to the cushion cylinder.
When the slide position signal received from the slide position detecting means matches the slide position signal set by the locking position setting means, the locking control means outputs an exhaust signal for exhausting the cushion air to the cushion air exhaust means. A die cushioning device for press machines characterized by output. In the die cushion device of the press machine according to any one of claims 1 to 9.
The slide position detecting means detects the slide angle as the vertical position of the slide via a drive gear interlocking with the drive motor of the slide drive means.
The locking position setting means is a die cushion device for a press machine, characterized in that a slide position when locking the cushion pad is set according to the slide angle.

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