JP3375288B2 - Press machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents a worker from being injured by a slide by enlarging the die height when a safety one stroke or a one-stroke operation causes a fall twice and other safety devices do not operate. It relates to a press machine that can do.

[0002]

2. Description of the Related Art The basics of preventing a press accident in a press machine in which the power of a power source is transmitted to a slide which is connected through a slide drive device and a connecting rod and which is guided by a slide guide surface to raise and lower the slide are described. Although it is a no-hand in-die that does not put hands between the molds and does not reach the hands, most of the single-shot products manufactured by the press machine operate the press machine intermittently so that the worker does not reach between the molds. This is a press work of a hand-in die that performs press work while inserting and supplying materials and taking out processed products, and most of the work accidents caused by the press work occur in the press work of this hand-in die.

In the safe one-stroke operation, which is one of the intermittent operation modes in the pressing operation of the hand-in die,
The inching operation function is required from the set stop point of the slide to the crank angle range corresponding to the position of 8mm before the bottom dead center of the slide, which is the position where the danger prevention function is disabled, but if this range is exceeded, both hands can be operated. Even if you release or keep pressing the pushbutton, the slide will continue to the set stop point and will stop at the set stop point.

Further, in the stroke operation, when the two-hand operation type push button is pressed, the slide is activated, and the slide is set from the setting stop point to the setting stop point even if the hand is released from the two-hand operation push button or is continuously pressed. It goes up and down one stroke and stops at the set stop point.

However, when performing intermittent work in such a safe one stroke or one stroke operation, the slide is supposed to stop at a set stop point (for example, top dead center) by a signal from the rotary cam switch. If there is a problem with the rotary cam switch, limit switch, or solenoid valve drive relay that forms part of the above, the slide cannot be stopped, so the set stop point is overrun and falls twice. Very dangerous.

Therefore, the power press machine structure standard is 3
For crank presses of 00 spm or less, it is specified to install a so-called overrun monitoring device that monitors whether or not the stop circuit is normal near the set stop point. That is, the stop angle of the crank pin etc. of the press machine is monitored for each stroke, and when the crank pin etc. cannot be stopped at each of the set stop points, the rotation of the crank shaft etc. is stopped by the sudden stop mechanism. Is giving instructions. It functions only when an overrun occurs, but it does not detect a simple slip, but stops safely.

Specifically, the number of revolutions of the crankshaft etc. is 300.
For crank presses with spm or less, set the overrun monitoring device within +15 degrees for slide strokes within 150 spm from the set stop position, within +25 degrees for slide strokes over 150 spm and within 300 spm. Is set.

[0008]

However, even this overrun monitoring device (double drop prevention device ... Other safety device) is effective against electrical failure of the circuit, but mechanical failure (for example, The effect is low and it cannot be said to be perfect.

In this regard, for example, Japanese Utility Model Publication No. 56-4255.
Although safety devices such as Japanese Patent Publication No. 8 and Japanese Utility Model Publication No. 57-15434 have been proposed, these are forcibly stopping the press machine when the clutch / brake fails. Therefore, it is necessary to instantly absorb the inertial force of the entire press machine including the flywheel, which is much more severe than in the case of stopping by the clutch / brake. In other words, due to the absorption of the inertial force, not only the safety device but also the press machine is likely to be partially damaged.

An object of the present invention is to provide a press machine capable of enlarging the die height to prevent an operator from being hindered by a slide when another safety device does not operate in a safe one stroke or one stroke operation. To provide.

[0011]

According to a first aspect of the present invention, the power of a power source is transmitted to a slide which is connected through a slide driving device and a connecting rod and is guided by a slide guide surface, and the slide is moved up and down. In the press machine, a slide braking device having a contact plate member capable of contacting and separating from the braking portion of the slide, capable of moving up and down the slide in a separated state, and applying a braking force in a contacted state, A cylinder mounted in the slide and a piston connected to the connecting rod, and capable of maintaining a predetermined distance between the lower end of the connecting rod and the lower surface of the slide while maintaining pressure oil in the cylinder chamber; It is formed so that the distance between the lower end of the connecting rod and the lower surface of the slide can be made shorter than a predetermined distance with the pressure oil released. A pressure cylinder device is provided, and the back plate member of the slide braking device is used by using the overrun detection signal detected when the slide overruns the set stop point during the press operation in the safe one stroke or one stroke operation. Pressing is performed by switching to the contact state to apply a braking force to the slide, release the pressure oil in the cylinder chamber of the hydraulic cylinder device, and forcibly raise the slide lower surface position by the predetermined interval while stopping the slide. It is a press machine formed so that it can be held at an enlarged die height position above the set die height position during processing.

In the above invention, when the slide overruns without operating the other safety devices, for example, an overrun detection signal generated by directly detecting the slide position or indirectly detecting the crank angle is generated. Then, the slide braking device is actuated, and the backing plate member is directly formed on the slide or abuts on the braking portion attached to the slide to apply a braking force to the slide, so that the slide can be stopped rapidly.

Simultaneously with this, the pressure oil held in the cylinder chamber of the hydraulic cylinder device acting as the rapid die height expanding means is released, so that the distance between the lower end of the connecting rod and the lower surface of the slide is smaller than a predetermined distance. Can also be shortened rapidly. That is, since the slide lower surface position can be rapidly raised to the enlarged die height position above the set die height position during press working while stopping the slide, other safety devices did not operate during the safe one stroke or one stroke operation. Even at times, it is possible to prevent the operator from being hindered by the slide.

According to a second aspect of the present invention, there is provided a press machine in which the contact plate member of the slide braking device is formed to be able to apply the braking force by hydraulic pressure or spring pressure. In this invention, the contact plate member is brought into contact with the slide by spring pressure or hydraulic pressure. Therefore, in addition to the same operational effect as in the case of the first aspect of the invention, a stable and reliable braking force can be applied.

According to a third aspect of the present invention, a balance cylinder is provided in the lower chamber so that the slide can be suspended while holding a predetermined pressure of air, and the boosted air supply is performed by using the overrun detection signal. This is a press machine in which air having a pressure higher than the predetermined pressure can be forcibly supplied from the device to the lower chamber.

In the above invention, the slide chamber is moved up and down while the predetermined pressure air is held in the lower chamber of the balance cylinder and the slide is suspended. Stable operation that eliminates the so-called breathing phenomenon can be performed. Here, if the overrun detection signal is generated without the operation of other safety devices, the booster air supply device forcibly supplies the air below the predetermined pressure to the lower chamber of the balance cylinder, so that the rapid die height It acts as an assisting means for the enlarging means and can rapidly raise and suspend the slide to a position higher than normal (predetermined position) with reference to the press frame side. Therefore, in addition to the same operational effects as in the case of each of the first and second aspects of the invention, the slide can be swiftly and surely moved to the enlarged die height position above the set die height position during press working. Since it can be raised and held, the safety of workers can be more surely guaranteed.

Further, the invention of claim 4 is in a press machine for moving the power of a power source to a slide which is connected through a slide drive device and a connecting rod and is guided by a slide guide surface, while moving the slide up and down. In the case where the slide is formed so as to be able to be suspended at a predetermined height in a state where a predetermined pressure of air is held in the lower chamber and air having a pressure higher than the predetermined pressure is forcibly supplied to the lower chamber from a booster air supply device. A balance cylinder formed so that the slider is lifted to a position higher than the predetermined height so as to be suspended, a cylinder mounted in the slide, and a piston connected to the connecting rod are used to apply pressure to a cylinder chamber. With the oil held, the lower end of the connecting rod and the slide lower surface can be held at a predetermined distance and the pressure oil is released. Provided is a hydraulic cylinder device formed so that the distance between the lower end of the connecting rod and the lower surface of the slide can be made shorter than a predetermined distance, and the slide can set a set stop point during press operation in safe one-stroke or one-stroke operation. When an overrun is detected, an overrun detection signal is used to forcibly supply the lower chamber of the balance cylinder with air at a pressure higher than the predetermined pressure from the booster air supply device, and the pressure in the cylinder chamber of the hydraulic cylinder device. Release the oil,
The press machine is formed so that the slide lower surface position is forcibly raised by the predetermined distance and can be held at the enlarged die height position above the set die height position during press working.

In this invention, when the slide overruns without the operation of the other safety device, an overrun detection signal is generated which is detected directly from the slide position or indirectly from the crank angle. Then, since air having a pressure higher than the predetermined pressure is forcibly supplied from the booster air supply device to the lower chamber of the balance cylinder, the slide is rapidly raised to a position higher than the normal (predetermined position) with reference to the press frame side. You can hang. That is, it works as a second means for expanding the rapid die height. At the same time, the pressure oil held in the cylinder chamber of the hydraulic cylinder device that functions as the first rapid die height expanding means is released, so that the distance between the lower end of the connecting rod and the lower surface of the slide is smaller than the predetermined distance. Can also be shortened rapidly.

In other words, the slide position can be rapidly raised to a position higher than usual by simultaneously operating the two rapid die height expanding means on the slide. In other words, since the slide lower surface position can be rapidly raised to the expanded die height position above the set die height position during press working, work with slides can be performed even during safety one stroke or one stroke operation even when other safety devices do not operate. It is possible to prevent an obstacle to a person.

Further, according to the invention of claim 5, the brake shoe is pressed against the flywheel constituting the slide drive device by using the overrun detection signal so that the braking force can be applied to the flywheel. It is a press machine provided with a flywheel braking device.

In this invention, when the overrun detection signal is generated, the flywheel braking device operates. That is, the brake shoe is pressed against the flywheel that constitutes the slide drive device, and a braking force is applied to the flywheel. Therefore, in addition to the same operational effects as in the case of each of the first to fourth aspects of the invention, the slide overrun can be further reduced and the slide can be stopped more rapidly. It's safe.

Further, the invention of claim 6 is constructed such that the hydraulic cylinder device also serves as a hydraulic cylinder device that constitutes a hydraulic overload safety mechanism for protecting the press when an overload is applied to the slide. It is a pressing machine.

According to the present invention, the hydraulic cylinder device constituting the rapid die height expanding means is also used as the hydraulic cylinder device constituting the hydraulic overload safety mechanism of the press. In addition to the same operational effects as in the case of each of the above-described inventions, the size and weight of the slide can be further reduced and the cost can be reduced.

Further, the invention of claim 7 is a press machine in which the braking portion of the slide is an oil-free system.
Therefore, since the frictional force at the time of braking can be increased, the same operational effect as in the case of each of the first to sixth aspects of the invention can be achieved, and the slide can be stopped more rapidly.

Further, the invention of claim 8 is that the overrun detection signal is generated when the lower surface of the slide is below a set crank angle equivalent position defined by the power press machine structure standard. It is a press machine.

In this invention, the overrun detection signal is generated when the lower surface of the slide overruns below the position corresponding to the set crank angle defined by the power press mechanical structure standard. The safety measures for both electrical and mechanical faults of the overrun monitoring device can be activated simultaneously. Therefore, in addition to the same operational effects as in the case of each of the first to seventh aspects of the invention, the safety and reliability can be further improved, and the overrun detection signals of both can be shared. It is possible.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) The present press machine is a C-frame press 1 shown in FIGS. 1 to 3, and a slide braking device 20 shown in FIGS. 4 and 5 and a hydraulic cylinder device 35 (30) shown in FIG. And a slide braking device 20 using the overrun detection signal 52 detected when the slide 13 overruns the set stop point during the press operation in the safe one-stroke or one-stroke operation. The contact plate members (25A, 25B) of the hydraulic cylinder device (35) are switched to the contact state to apply a braking force to the slide 13 (braking portion 13A) and the cylinder chamber 3 of the hydraulic cylinder device (35).
The pressure oil of No. 3 is released, the slide 13 is stopped, and the slide lower surface position is forcibly and rapidly raised by a predetermined interval to expand the die height position (H1 in FIG. 6) above the set die height position (H1 in FIG. 6) during press working. H2) can be held. In addition, the flywheel braking device 4 shown in FIG.
0 is provided so that the slide 13 can be stopped immediately by one step.

1 to 3, a C frame press 1
Transmits the power of the power source (main motor 3) to the slide 13 which is connected via the slide drive device and the connecting rod 12 and guided by the slide guide surface (liner 18 in FIG. 4). It is formed so that it can be raised and lowered.

The slide drive device transmits the power of the main motor 3 to the flywheel 6 via the pulley 4 and the belt 5 attached to the main motor 3, and further the flywheel 6
Combination type clutches and brakes 7 installed inside
Through the drive shaft 8 to the main gear 10 that meshes with the pinion 9 on the drive shaft 8. The main gear 10 is fixed to a crank shaft 11 rotatably supported by the frame 2, and an eccentric portion 11A of the crank shaft 11 is rotatably fitted with a connecting rod 12.

One end of the connecting rod 12 is
It is connected to the slide 13 near the upper jaw 2A of the frame 2. By operating the two-hand operation type push button 16 provided on the front surface of the C-frame press 1 at a predetermined safety distance, the slide guide surface (liner 18 in FIG. 4) is slid through the sliding portion of the slide 13. The slide 13 that is movably guided can be moved up and down (normal operation). The lower jaw 2B of the frame 2 is provided with a bolster 15 for mounting a lower mold (not shown).

The slide 13 and the eccentric portion 11A of the crankshaft 11 are connected to each other via the connecting rod 12, and there are several places between the slide 13 and the slide adjusting portion 17 including the lower end of the connecting rod 12. There is a joint. The clearance of each of the coupling portions is brought to one side by the weight of the slide 13. Therefore, when a work load is applied, the clearance is brought to the opposite side because the direction is opposite to the direction of gravity. During this biasing period, the slide 13 is temporarily stopped. It is called a so-called breathing phenomenon.

Therefore, in order to eliminate the breathing phenomenon and balance the weight of the slide 13 (including an upper mold not shown) to perform a smooth slide up-and-down motion, the cylinder is fixed to the frame 2 side. A balance cylinder 19 is provided whose piston rod is connected to the slide 13.
A predetermined pressure air is applied to the lower chamber (19A in FIG. 4) to suspend the slide 13. In the first embodiment, the balance cylinder 19 is effectively used as an auxiliary means of the hydraulic cylinder device 35 (30) that constitutes the rapid die height expanding means. Of course, a dedicated balance cylinder may be provided as an auxiliary means. The function and the like of the balance cylinder 19 as the auxiliary means will be described in detail in the second embodiment.

Now, as shown in FIG. 4 (when not operating ... Before operation) and FIG. 5 (when operating ... During operation), the slide braking device 20 has a projection plate of the slide 13, that is, a braking portion 13A, and a contact plate member (25A). , 25B) are brought into contact with each other to directly apply a mechanical frictional force to the slide 13 to brake it. That is, the backing plate members (25A, 25B)
Can be braked by directly contacting the slide 13 (13A) body.

This slide braking device 20 is shown in FIGS.
, A cylinder 24 slidably fitted in the hole of the frame 2 and a piston 21 having a rod portion 21A.
And the spring 23 mounted in the hole 24A of the cylinder 24
And the spring 23 can be expanded / contracted and adjusted, and the bolt 26
And a rear moving block 28 attached to the piston 21 by
It is composed of a front moving block 27 and the like attached to the cylinder 24 with bolts 29. The front side lining 25A and the rear side lining 25B, which form the backing plate member, are attached to the front moving block 27 and the rear moving block 28, respectively, so as to face the braking portion 13A of the slide 13. It should be noted that instead of the spring 23, a hydraulic system can be brought into stable and reliable contact.

And both contact plate members (25A, 25B)
4B, a small gap S1 is provided between the right end of the bolt 22 that fastens the piston 21 to the frame 2 in FIG. Therefore, a minute gap S2 is provided between the end surface of the frame 2 and the end surface of the cylinder 24.

Thus, as shown in FIG. 4A, during normal operation of the C-frame press 1, pressurized air is supplied from the supply / discharge port 21B of the piston 21 to the cylinder chamber 24B, and the cylinder 24 and the piston 21 are operated. Let A minute gap is formed between the front surface side lining 25A and the rear surface side lining 25B and the front and rear surfaces of the slide guide 14 to maintain the separated state. Therefore, since the slide guide 14 is slidably guided by the liner 18 on the frame 2 side, it can be smoothly moved up and down. The pressing operation is repeated by connecting / disconnecting the clutch / brake (7) in the set operation mode (for example, one safe stroke).

The control circuit of the C-frame press 1 is provided with an overrun monitoring device based on the power press mechanical structure standard, and when the slide 13 exceeds the set angle with respect to the set stop point, an abnormality is detected. It is supposed to automatically detect and give an instruction to stop. After the slide 13 suddenly stops due to the operation of the overrun monitoring device, the slide 13 can be restarted only after returning to the set stop point by the inching operation. Further, in this embodiment, this abnormality detection signal is also used as the overrun detection signal 52 for simultaneously operating the rapid die height enlarging means (35) and the auxiliary means (19) and the flywheel braking device 40.

However, when another safety device (overrun monitoring device) does not operate, that is, the C-frame press 1 that is operating the press in a safe one-stroke or one-stroke operation overruns the set stop point and twice. When there is a risk of falling, as shown in FIG. 4B, the overrun detection signal 52 of FIG. 9 (however, at the preset position of the overrun monitoring device or at a preset position near the preset position) This may be used to cut off the power supply to the main motor 3 and to perform the slide braking shown in the pneumatic circuit diagram of the rapid die height expanding means (35) of FIG. 8 and the like. By operating the device solenoid valve 53, the pressure air in the cylinder chamber 24A of the slide braking device 20 is exhausted, and the biasing force of the spring 23 causes the front side lining 25A and the rear side lath. The training 25B slide 13
The sliding portion 13A is brought into contact (sandwiched) with the braking portion 13A to brake the descending movement of the slide 13 to prevent the slide 13 from injuring an operator.

The stroke length of the rear lining 25B (the amount of movement in the left-right direction in FIG. 4) is the same as the stroke length of the piston 21, for example, 0.7 mm shown in FIG. In addition, in the present embodiment, the slide braking device 20
In order to improve the braking effect of the above, the braking portion 13A is of an oil-free type. That is, it is different from the sliding portion of the oil supply system that is in sliding contact (guide) with the sliding guide surface (liner 18) on the frame 2 side.

Next, the slide 13 shown in FIG. 2 and FIG.
In order to protect the C-frame press 1 from overload, the slide adjusting part 17 of FIG. 1 has an empty cylinder composed of a hydraulic cylinder device 30 (hydraulic cylinder 31, piston 32) and an air cylinder 36 mounted on the load transmitting part of the slide 13. A hydraulic overload safety mechanism is provided. At the time of overload, the pressure oil in the cylinder chamber 33 (a preload corresponding to the press capacity is given by air pressure) is released to the air cylinder 36 side, so that the hydraulic cylinder 31 and the piston 32 are vertically opposed to each other. Allows movement to protect against overload.

That is, as shown in FIG. 5A, the overload safety mechanism (30, 36, etc.) is in a state in which the pressure oil is held in the cylinder chamber 33 during the normal operation of the press.
When an overload is applied to the C-frame press 1, FIG.
As shown in (b), the piston 32 apparently descends due to overload, and the pressure oil in the cylinder chamber 33 can be released.

In the first embodiment, the hydraulic cylinder device 30 forming a part of the overload safety mechanism is used as a hydraulic cylinder device (35) constituting the rapid die height expanding means (combined construction). 5 (a), (b)
The hydraulic release device 34 shown in FIG. That is,
When the C-frame press 1 that is operating the press in one-stroke or one-stroke operation overruns the set stop point and falls twice, and the other safety devices provided in the C-frame press 1 do not operate, slide At the same time, the overrun detection signal (abnormality detection signal) 52 for operating the braking device 20 is received, and the pressure oil releasing device 34 is operated simultaneously with the operation of the slide braking device 20.

That is, the hydraulic release solenoid valve 54 shown in the pneumatic circuit diagram of the rapid die height expansion means (35, 34) in FIG. 8 is actuated to operate the hydraulic cylinder device 3 of the overload safety mechanism.
0, the pressure oil in the cylinder chamber 33 is discharged, and the slide 13
6 can be raised by a predetermined distance (length L) from the set die height H1 shown in FIG. 6 at the time of press working, and can be rapidly raised to the enlarged die height (H2) position.

Incidentally, in the first embodiment of the present invention,
Hydraulic cylinder device 30 of overload safety mechanism (30, 36)
Was also used as the hydraulic cylinder device (35) of the rapid die height expanding means (35, 34), but the hydraulic cylinder device (35) may be provided exclusively in the slide 13.

Further, a flywheel braking device 40 provided on the outer peripheral surface of the flywheel 6 shown in FIGS. 2 and 3.
Are provided as auxiliary means for improving the slide stop performance by the operation of the slide braking device 20. That is, the flywheel braking device 40 promptly coasts the flywheel 6 when the original purpose of the work is stopped, when the die is inspected, or when the C frame press 1 needs to be quickly reversed. It is not provided for the purpose of stopping the vehicle, but is provided for ensuring the safety of the worker against overrun.

More specifically, as shown in FIG. 7, the flywheel braking device 40 includes a cylinder 41 fixedly mounted on the frame 2, a piston 42 having a rod portion 42A and internally mounted in the cylinder 41, and a spring. A brake shoe 43 provided at the tip of the rod portion 42A so as to be able to contact the outer peripheral surface of the flywheel 6 and to brake the rotational movement by utilizing the biasing force of the flywheel 6, and the outer peripheral surface of the flywheel 6 and the brake shoe 43 and a limit switch 45 for detecting the released state.

During normal press operation, the cylinder chamber 41A
The limit switch 45 detects that the brake shoe 43 is released from the outer peripheral surface of the flywheel 6 by the pressure air supplied to the rod 42A of the piston 42 via the pin 46 provided on the rod portion 42A. When this is detected, continuous operation is permitted.

However, when the slide braking device 20 is operated, the overrun detection signal (abnormality detection signal) 52 is received simultaneously with the case of the slide braking device 20, and the rapid die height expanding means (35, 36) shown in FIG. By operating the electromagnetic valve 55 for the flywheel braking device shown in the pneumatic circuit diagram, the pressure air in the cylinder chamber 41 is exhausted, and the braking force of the spring 44 causes the brake shoe 43 to contact the outer peripheral surface of the flywheel 6. Upon contact, the flywheel 6 can be stopped rapidly.

According to the first embodiment, as shown in FIG. 9, the set stop position is set to the top dead center U and the set position of the overrun monitoring device is set to the crank angle of 15 degrees for the safe one-stroke operation. When performing intermittent work, each device, mechanism, and operation timing when the rapid die height enlarging means (35) is actuated experimentally with the clutch / brake solenoid valve 51 energized to keep the clutch 7 in the contact state The correlation was as shown in the measurement graph of FIG.

That is, when the two-hand operation push button 16 is pushed, the clutch 7 is brought into contact with the clutch / brake solenoid valve 51 shown in FIG. 9, and the slide 13 is activated to start ascending / descending. When the slide 13 travels one stroke and does not stop at the top dead center U and the crank angle exceeds 15 degrees at the set position of the overrun monitoring device, an overrun is detected and an overrun detection signal 52 is generated.

Then, by the operation of the solenoid valve 53 for the slide braking device shown in FIG. 8, the slide braking device 20 operates and both the linings 25A and 25B come into contact with the braking portion 13A to apply a braking force to brake the slide 13. . At the same time, the hydraulic oil release solenoid valve 54 is actuated to discharge the pressure oil in the cylinder chamber 33 of the hydraulic cylinder device 35, and the set die height (H) shown in FIG.
It is increased by a required length (L) from 1) to obtain the expanded die height (H2). In this case, L = 23 mm.

At the same time, the main motor 3 is turned off and the flywheel braking device solenoid valve 5 is turned on.
5, the pressure air in the cylinder chamber 41A is exhausted,
The flywheel 6 is braked, and the slide braking device 20
To assist the braking of slide 13.

As shown in FIG. 9, there is a slight time lag between the start of operation of the overrun detection signal 52, the solenoid valves 53, 54 and 55, and the start of power-off of the main motor 3. It is generated from the control circuit, and the operation start of each solenoid valve 53, 54, 55 and the power-off start time of the main motor 3 are almost at the same time.

In order to compare the effects depending on whether the flywheel braking device 40 is attached or not, the flywheel braking device 4 is shown in FIG. 10 (corresponding to FIG. 8) and FIG. 11 (corresponding to FIG. 9).
An example in which 0 is not set is shown.

In FIG. 11, when the flywheel braking device 40 is not provided, the slide 13 has a required length (L = 20 mm in this embodiment) from the set die height (H1) position on the bottom dead center. It is stopped at a position higher by 20 minutes (corresponding to a crank angle of about 127 degrees during normal operation) by a die height (H2). This is when stopping at the die height (H2) expanded to 23 mm (corresponding to a crank angle of about 123 degrees during normal operation) above the set die height (H1) of (when the flywheel braking device 40 is provided). Inferior to That is, the effect obtained by providing the flywheel braking device 40 as an auxiliary means of the slide braking device 20 was confirmed.

In FIG. 12, one solenoid valve 53 for the slide braking device actuates both the cylinder device 30 of the overload safety mechanism which is also used and the hydraulic cylinder device (35) which constitutes the rapid die height expanding means. An example in which another function switching solenoid valve 56 is provided in the pneumatic circuit diagram shown in FIG. 8 is shown.

Similarly, FIG. 13 shows a case where the circuit for the flywheel braking device 40 in the pneumatic circuit diagram of FIG. 12 is not provided.

The operation of each device is the same as in the above-mentioned case, and the description thereof is omitted.

(Second Embodiment) This embodiment is basically the same as the first embodiment (FIGS. 1 to 3, FIG. 6 and FIG. 7), but the rapid die height expansion is performed. In the case where the means comprises a first rapid die height enlarging means formed by a hydraulic cylinder device 35 (30) and a second rapid die height enlarging means formed by a balance cylinder 19 and the slide braking device 20 is omitted, Corresponds to item 4. The balance cylinder 19 is the same as the balance cylinder (19) described in the first embodiment. Therefore, the pneumatic circuit may be provided for the slide cylinders (53 and the like) from FIG. 8 and for the balance cylinder (64 and the like) shown in FIG.

That is, as shown in FIGS. 1 and 14, C
During normal operation of the frame press 1, the pressure air P0 supplied from the air source 61 is adjusted to a predetermined pressure air P1 by the pressure reducing valve 62, and the lower chamber 19A of the balance cylinder 19 is adjusted.
The slide 13 connected to the piston rod and including the upper mold to balance the weight of the slide 13,
Make a vertical movement.

Here, when the slide 13 travels one stroke and does not stop at the top dead center U and the overrun detection signal 52 is transmitted beyond the set position of the overrun monitoring device, the first rapid tie height expanding means. Simultaneously with the operation of each device constituting (35, 34), the second rapid tie height expanding means (1
The balance cylinder solenoid valve 64 constituting 9) is switched. As a result, the supply circuit of the pressure air P1 is cut off, and the pressure air P0 supplied from the air source 61 is increased by the pressure intensifier 63 which forms a pressure increase air supply device.
The pressure air P2 having a pressure higher than 1 is generated, and the lower chamber 19A of the balance cylinder 19 is rapidly supplied to rapidly raise the slide 13 upward.

Therefore, according to this second embodiment, two rapid die height expanding means (35, 34),
Since (19) is provided, the slide braking device 20 and one rapid die height expanding means (35, 34) are provided.
The same effect as in the case of the above embodiment can be obtained.

As a modified example, as shown in FIG. 15, during normal operation of the press, the pressure air P0 supplied from the air source 61 is adjusted to a predetermined pressure air P adjusted by the pressure reducing valve 62.
In step 1, the weight of the slide 13 including the upper die is balanced to allow the slide 13 to move up and down smoothly. However, when the overrun detection signal 52 is transmitted, the rapid die height expanding means (35, 34) is configured. Simultaneously with the operation of each device, the balance cylinder solenoid valve 65 is switched to shut off the supply circuit of the pressure air P1. In this way, the slide 13 can be pulled up while utilizing the pressure increasing phenomenon in the lower chamber 19A of the balance cylinder 19 during the descending stroke of the slide 13. It is understood that the booster air supply device in such a case is formed from the balance cylinder 19 (lower chamber 19A) itself.

If the pneumatic circuit diagram for the balance cylinder shown in FIG. 14 or FIG. 15 is added to the pneumatic circuit of the first embodiment (FIG. 8, FIG. 10 or FIG. 12), the rapid die height expansion can be achieved. It can be effectively used as an auxiliary means of the means (35, 34). That is, the invention of claim 3 can be established.
Then, in this way, the slide 13 can be raised more rapidly than in the case of the inventions of claim 1 and claim 2 described in the first embodiment, so that the safety can be further improved. .

[0065]

As is apparent from the above description, according to the first aspect of the present invention, the overrun detection signal is used to switch the contact plate member of the slide braking device to the abutting state to apply the braking force to the slide. The pressure oil in the cylinder chamber of the hydraulic cylinder device is released and the slide is stopped rapidly while the slide bottom surface position is forcibly and rapidly raised by a predetermined interval to expand above the set die height position during press working. Since the press machine is configured to be able to hold the slide at the die height position, it is possible to prevent the operator from being injured by the slide even when other safety devices do not operate during the safe one-stroke or one-stroke operation. .

Further, according to the invention of claim 2, since the contact plate member of the slide braking device is formed so as to be able to apply the braking force by hydraulic pressure or spring pressure, the same effect as in the case of the invention of claim 1 is obtained. In addition to being able to play, it is possible to apply a stable and reliable braking force.

According to the third aspect of the present invention, a balance cylinder is provided in the lower chamber so that the slide can be suspended while holding a predetermined pressure of air, and the boosted air supply is performed by using the overrun detection signal. Since high pressure air can be forcibly supplied from the device to the lower chamber, the same effects as those of the inventions of claims 1 and 2 can be obtained, and further, the set die height at the time of press working can be obtained. Since the slide can be raised and held at the enlarged die height position above the position more rapidly and surely, the safety of the worker can be more surely guaranteed.

According to the invention of claim 4, high pressure air is forcibly supplied from the boosting air supply device to the lower chamber of the balance cylinder by utilizing the overrun detection signal detected when overrun occurs. A press formed to release the pressure oil in the cylinder chamber of the hydraulic cylinder device, forcibly and rapidly raising the slide lower surface position by a predetermined interval so that it can be held at the enlarged die height position above the set die height position during press working. Since it is a machine, it is possible to prevent the operator from being hindered by the slide even when other safety devices do not operate during the safe one-stroke or one-stroke operation.

Further, according to the invention of claim 5, a flywheel braking device is provided which can apply a braking force by pressing the brake shoe against the flywheel using the overrun detection signal. In addition to the effects similar to those of the inventions up to claim 4, the slide overrun can be further reduced and the slide can be stopped, which is further safe.

Further, according to the invention of claim 6, the hydraulic cylinder device constituting the rapid die height expanding means is constructed also as the hydraulic cylinder device constituting the hydraulic overload safety mechanism of the press. In addition to the same effects as in the case of each of the first to fifth aspects of the invention, the slide can be made smaller and lighter and the cost can be reduced.

Further, according to the invention of claim 7, since the braking portion of the slide is of the oilless type, it is possible to obtain the same effects as those of the inventions of claims 1 to 6. In addition, slides can be stopped more quickly.

Further, according to the invention of claim 8, the overrun detection signal is generated when the lower surface of the slide falls below the position corresponding to the set crank angle specified by the power press mechanical structure standard. Therefore, in addition to the same effects as in the case of each of the inventions of claims 1 to 7, the safety and reliability can be further improved, and the overrun detection signals of both can be shared. It is possible to

[Brief description of drawings]

FIG. 1 is a front view of a C-frame press equipped with a rapid die height expanding means and the like according to a first embodiment of the present invention.

FIG. 2 is likewise a side sectional view of a C-frame press equipped with a rapid die height expanding means and the like.

FIG. 3 is likewise a rear view of a C frame press equipped with a rapid die height expanding means and the like.

FIG. 4 is also a diagram for explaining before the operation of the slide braking device, in which (a) is a top view and (b) is a side sectional view.

FIG. 5 is a diagram for explaining the operation of the slide braking device, in which (a) is a top view and (b) is a side sectional view.

FIG. 6 is also a diagram for explaining the operation of the hydraulic cylinder device, in which (a) is a side sectional state diagram before the operation, and (b) is a side sectional state diagram showing the operating state.

FIG. 7 is likewise a cross-sectional view for explaining the flywheel braking device.

FIG. 8 is a pneumatic circuit diagram of a rapid die height expanding means and the like.

9 is a measurement graph showing the correlation of each device when the rapid die height expanding means and the like are activated in the pneumatic circuit diagram of FIG.

FIG. 10 is also a pneumatic circuit diagram for explaining the effect comparison in which the pneumatic circuit for the flywheel braking device is removed from FIG.

11 is a measurement graph showing the correlation of each device when the rapid die height expanding means and the like are activated in the pneumatic circuit diagram of FIG.

FIG. 12 is also a pneumatic circuit diagram for explaining a modified example in which a function switching solenoid valve is provided as compared with the case of FIG.

FIG. 13 is also a pneumatic circuit diagram for explaining a modified example in which a function switching electromagnetic valve is provided as compared with the case of FIG. 10.

FIG. 14 is a pneumatic circuit diagram for a balance cylinder that constitutes a rapid die height expanding means together with a hydraulic cylinder device according to a second embodiment of the present invention.

FIG. 15 is also a pneumatic circuit diagram for explaining a modified example in which the boost cylinder is formed by the balance cylinder itself.

[Explanation of symbols]

1 C frame press 2 frame 3 main motor (power source) 6 flywheel 11 crankshaft 12 connecting rod 13 slide 13A braking part 14 slide guide (sliding part) 16 two-hand operation push button 17 slide adjusting part 18 liner (sliding) 19) Balance cylinder (rapid die height expanding means, booster air supply device) 19A Lower chamber (pressure booster air supply device) 20 Slide braking device 21 Piston 21A Rod part 23 Spring 24 Cylinder 24B Cylinder chamber 25A Front side lining Plate member) 25B Rear both sides lining (patch plate member) 27 Front movement block 28 Rear movement block 30 Hydraulic cylinder device (overload safety mechanism) 31 Hydraulic cylinder 32 Piston 33 Cylinder chamber 34 Pressure oil release device (quick die height expansion means) 35 Hydraulic cylinder Installation (quick die height expansion means) 36 Air cylinder (overload safety mechanism) 40 Flywheel braking device 43 Brake shoe 44 Spring 51 Solenoid valve for clutch / brake 52 Overrun detection signal 53 Solenoid valve 54 for sliding braking device 54 Hydraulic release Solenoid valve 55 Solenoid valve for flywheel braking device 56 Solenoid valve for function switching 61 Air source 63 Pressure booster (pressure boosting air supply device) 64, 65 Solenoid valve for balance cylinder

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-49-108674 (JP, A) JP-A-62-144899 (JP, A) JP-A-7-214397 (JP, A) Sankaihei 4- 118299 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B30B 15/28 B30B 15/06

Claims (8)

(57) [Claims] 1. A press machine for moving the power of a power source to a slide connected through a slide drive device and a connecting rod and guided by a slide guide surface to raise and lower the slide. A slide braking device having a contact plate member capable of abutting and separating, and capable of raising and lowering the slide in a separated state and applying a braking force in the abutting state, a cylinder mounted in the slide, and the connectin. The connecting rod of the connecting rod can be held in a state where the distance between the lower end of the connecting rod and the lower surface of the slide can be maintained at a predetermined interval while the pressure oil is held in the cylinder chamber including the piston connected to the rod. A hydraulic cylinder device formed so that the distance between the lower end and the lower surface of the slide can be made shorter than a predetermined distance is provided. The slide plate to the contact state by using the overrun detection signal detected when the slide overruns the set stop point during the press operation in the stroke or one stroke operation. Applying a braking force and releasing the pressure oil in the cylinder chamber of the hydraulic cylinder device, forcibly raising the slide lower surface position by the predetermined interval while stopping the slide above the set die height position during press working. Enlarged press machine that can be held at the die height position. 2. The press machine according to claim 1, wherein the contact plate member of the slide braking device is formed to be able to apply the braking force by hydraulic pressure or spring pressure. 3. A balance cylinder is provided in the lower chamber so that the slide can be suspended while maintaining a predetermined pressure of air, and the pressure boosting air supply device is used to move from the booster air supply unit to the lower chamber by using the overrun detection signal. The press machine according to claim 1, wherein the press machine is configured to be capable of forcibly supplying air having a pressure higher than a predetermined pressure. 4. A press machine which moves the power of a power source to a slide which is connected through a slide drive device and a connecting rod and which is guided by a slide guide surface to move the slide up and down, and a predetermined pressure air is supplied to the lower chamber. The slide can be suspended to a predetermined height while holding the slider, and the slider above the predetermined height when the lower pressure chamber is forcibly supplied with air having a pressure higher than the predetermined pressure from the booster air supply device. A balance cylinder that is lifted to a high position so as to be suspended, a cylinder that is mounted in the slide, and a piston that is connected to the connecting rod, and that holds the pressure oil in the cylinder chamber. The connection between the lower end and the lower surface of the slide can be maintained at a predetermined distance and the pressure oil in the cylinder chamber is released. Provided with a hydraulic cylinder device formed so that the distance between the lower end of the lid and the lower surface of the slide can be made shorter than a predetermined distance, and the slide exceeds the set stop point during press operation in one stroke or one stroke operation. By using the overrun detection signal detected when a run occurs, the booster air supply device is forced to supply air having a pressure higher than the predetermined pressure to the lower chamber of the balance cylinder, and the pressure oil in the cylinder chamber of the hydraulic cylinder device is used. Is released to forcibly raise the slide lower surface position by the predetermined distance to hold it at the enlarged die height position above the set die height position during press working. 5. A flywheel braking device is provided which is capable of applying a braking force to the flywheel that constitutes the slide drive device by pressing a brake shoe against the flywheel using the overrun detection signal. The press machine according to any one of claims 1 to 4. 6. The hydraulic cylinder device according to claim 1, wherein the hydraulic cylinder device is constructed also as a hydraulic cylinder device that constitutes a hydraulic overload safety mechanism that protects a press when an overload acts on the slide. The press machine according to any one of 5 to 5. 7. The press machine according to any one of claims 1 to 6, wherein a braking portion of the slide is an oil-free system. 8. The method according to claim 1, wherein the overrun detection signal is generated when the lower surface of the slide falls below a position corresponding to a set crank angle defined by a power press mechanical structure standard. Item 1 up to item 7
Press machine described in paragraph.