JPH07115238B2 - Counter balance cylinder pressure controller for press - Google Patents

Description

TECHNICAL FIELD The present invention relates to a counterbalance cylinder pressure control device for a press.

[Prior Art] FIG. 3 and FIG.
Explaining with reference to the drawings, a slide 2 is provided in the housing 1 so as to be able to move up and down, an eccentric shaft 3 for driving the slide 2 up and down is rotatably supported by a bearing 4 on the upper part of the housing 1, and a gear 5 is provided at one end of the eccentric shaft 3. A gear 9, which is fixed and connected to the electric motor 6 via a coupling 7 and a clutch 8 for transmitting the driving force of the electric motor 6, meshes with the gear 5 to form an eccentric shaft 3
The connecting rod 11 is pivotally attached to the eccentric part 10 of the above, and the lower end of the connecting rod 11 is connected to the slide 2 so that the slide 2 can be moved up and down.

An upper mold 12 is exchangeably held on the lower surface of the slide 2, and a lower mold 13 is held replaceably on the lower part of the housing 1 so as to face the upper mold 12.

A rotary encoder 14 for detecting the position of the upper die 12 is attached to the other end of the eccentric shaft 3.

Further, the rod 15 is directed downward at the corner of the housing 1 (on the contrary, the rod 15 may be directed upward).
The counter balance cylinder 16 is fixed, and the rods 15 of the counter balance cylinder 16 are fixed to the mounting members 17 at the corners of the slide 2.

Incidentally, 25 is a material, and 26 is a power supply device for supplying electric power to the electric motor 6.

When operating the press, the power supply device 26 is turned on to operate the electric motor 6, and when the clutch 8 is turned on, the gear 9 rotates, and the rotation of the gear 9 is transmitted to the eccentric shaft 3 via the gear 5. Move the connecting rod 11 up and down, and move the connecting rod 11 up and down to move the slide 2 up and down.
The material 12 is formed between the lower mold 13 and the lower mold 13 by moving them away from each other.

In molding, the load exerted on the electric motor 6 by the weight of the slide 2 and the upper die 12 is canceled by the pushing force of the counterbalance cylinder 16, and the clearances of the bearing portion and the pin pivot portion provided in the press are molded. Counterbalance cylinder 16 during press operation so as not to adversely affect
And the slide 2 is lifted up to cancel the load and eliminate the clear balance.

As shown in FIG. 5, the conventional counter balance cylinder driving device has a check valve 20, a pressure reducing valve 21, and a check valve 22 in which air from a compressor 19 is sequentially introduced into a rod side air chamber 18 of a counter balance cylinder 16 from the upstream side. In addition, it can be supplied through a flow path 24 provided with a tank 23, and the upper mold 12 is set at a reference position (determined at an arbitrary position when the upper mold 12 and the lower mold 13 are replaced. (Reference position)
By setting the pressure of the air to be supplied to the rod side air chamber 18 (determined according to the weight of the upper die 12) using the pressure reducing valve 21, the check valve 20 and the pressure reducing valve 21 To the tank 23 and the rod-side air chamber 18 of the counterbalance cylinder 16 via the check valve 22, the air of the pressure set by the pressure reducing valve 21 from the compressor 19 is supplied, and the contraction of the counterbalance cylinder 16 causes the press operation. The slide 2 is always lifted upward to cancel the weight of the slide 2 and the upper die 12, and the clearance of the press is eliminated.

[Problems to be Solved by the Invention] However, in the above-described conventional counterbalance cylinder drive device, it is necessary to replace the upper die 12 and change the pressure setting of the pressure reducing valve 21 every time the weight of the upper die 12 changes. However, the problem that the pressure setting by the pressure reducing valve 21 is not easy and accurate, and because the pressure setting was accompanied by the replacement of the upper die 12, the rod side air chamber 18 and the counter balance cylinder 16 by the operation of the press and When the air is discharged from the tank 23, the counterbalance cylinder 16 cannot cancel the weight of the slide 2 and the upper die 12 and lose the function of the press clearance. Since the pressure in the lower air chamber 18 of 16 varies depending on the positions of the slide 2 and the upper die 12, the above pressure setting is always the upper die. Work for 12 must be performed in a state that has stopped at the reference position is there is a problem in that it is complicated.

In view of the above situation, the present invention uses an electric means to automatically optimize the air pressure in the rod-side air chamber of the counterbalance cylinder before the press is started and during the press operation, and when the press is stopped. It is an object of the present invention to provide a counterbalance cylinder pressure control device for a press that can solve the above problems.

[Means for Solving Problems] The present invention relates to a flow path provided with a solenoid valve for supplying air from a compressor to a rod side air chamber of a counterbalance cylinder of a press, and a solenoid valve for discharging air. A pressure gauge for detecting the pressure when the press is stopped is connected to the rod-side air chamber, and the pressure gauge and a setting device for setting the pressure with respect to the reference position of the rod-side air chamber. , And the power supply of the press,
And, by inputting signals from the press clutch and the rotary encoder of the press, before starting the press, during press operation, when stopping at the press reference position, and when stopping at a position other than the press reference position. In addition to determining the control target pressure for each of these cases, based on the control target pressure, so as to optimize the pressure of the rod-side air chamber, to provide a control device that sends a control signal to each solenoid valve, This is a counterbalance cylinder pressure control device for a press.

[Operation] Therefore, in the present invention, the control device inputs a signal from the rotary encoder in the same manner as the power supply device and the clutch, and determines the press reference position and the stop other than the reference position before starting the press and during the press operation, and In each case, input signals from the pressure gauge and the setting device, and send control signals to each solenoid valve for supplying and discharging air to the rod side air chamber so that the rod side air chamber of the counterbalance cylinder has an appropriate pressure. send.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view of an embodiment of the present invention, and the structure of the press itself is the same as that shown in FIGS. 3 and 4.

Air from the compressor 27 can be supplied to the rod-side air chamber 18 of the counterbalance cylinder 16 through a flow path 29 provided with a solenoid valve 28, and a solenoid valve 30 can be supplied from the rod-side air chamber 18. The air can be discharged through the flow path equipped with the
The pressure of the air in 18 is detected by the pressure gauge 32.

Further, the pressure gauge 32 and the setting device 34 for setting the pressure in the rod side air chamber 18 are input, and the signals from the control power source 26, the clutch 8 and the rotary encoder 14 shown in FIGS. A control device 33 is provided for performing the above calculation and outputting a signal for switching the solenoid valves 28, 30.

Next, a specific control procedure in the control device 33 will be described with reference to FIGS. 1 and 2.

In this case, in FIG. 2, a round frame indicates the start or end of the procedure, a rectangular frame indicates an instruction, a rhombic frame indicates a judgment, and S indicates control of air pressure in the rod side air chamber 18. Shows the target value, S ₀ shows the set value of the air pressure in the rod side air chamber 18 when the upper mold 12 is at the reference position, and S ₁ shows the upper mold 12 upper limit position (highest position). _Shows the correction value (S ₁ = K × S ₀ K: constant) of the set value S ₀ when
P indicates the pressure detection value of the air in the rod side air chamber 18, and P ₀ indicates the rod side air chamber 18 when the press is stopped.
The detected value of the pressure of the air inside is shown, and C is a constant showing the allowable range of the pressure inside the rod side air chamber 18.

First, when the upper die 12 and the lower die 13 are replaced, the pressure S _{0 of the} air to be supplied to the rod side air chamber 18 when the upper die 12 is at the reference position (depending on the weight of the upper die 12 Can be decided)
Is input using the setter 34.

In the subsequent press operation, the control device 33 operates as described later to automatically optimize the pressure of the air in the rod side air chamber 18 of the counter balance cylinder 16.

(I) First, the control power supply of the power supply device 26 is turned on (that is, the motor 6
And operation of the control device 33), and then the clutch 8
Is OFF, the control device 33 determines that the press has not been started,
The set value S ₀ of the setter 34 is set as the control target value S, and the detection value P of the pressure gauge 32 is within the range where the constant C of the control target value S is an error (S
-CPS + C), the process returns to the start if it is within the range, and if it is out of the range, the control target value S and the detected value P are further compared, and if the detected value P is larger than the control target value S ( S <P) Open solenoid valve 30 to open rod side air chamber 18
After discharging the air from the control unit, if the detected value P is smaller than the control target value S (S <P is not satisfied), the solenoid valve 28 is opened, air is supplied from the compressor 27 to the rod side air chamber 18, and then the process returns to the start. , And the same control is repeated thereafter. Therefore, when the upper die 12 is moved to the reference position to start the press operation, the air pressure in the rod side air chamber 18 is optimized.

(II) Next, when the control power of the power supply device 26 is turned ON and the clutch 8 is turned ON for the first time (that is, when the upper die 12 starts moving up and down from the reference position), the control device is turned ON until the clutch is turned OFF (that is, the press is stopped). It is judged that 33 is in the press operation, and when the position of the upper die 12 is not the upper limit position (highest position) by the signal from the rotary encoder 14, the process returns to the start and the upper die 12 is in the upper limit position by the signal from the rotary encoder 14. When the correction value S ₁ is reached, the correction value S ₁ is set as the control target value S and the detected value P is S-C.
If S <P, the solenoid valve 30 is opened to discharge the air from the rod side air chamber 18 so that it is within the range of PS + C. If S <P is not established, the solenoid valve 28 is opened to open the compressor.
Air is supplied to the rod side air chamber 18 from 27, and the same control is repeated thereafter, so that the air pressure in the rod side air chamber 18 during the press operation is optimized.

(III) Finally, when the control power supply of the power supply device 26 is turned on and the clutch 8 is once turned on to start the press operation and then the clutch 8 is turned off, the control device 33 judges that the press is stopped,
Furthermore, the upper die 12 is driven by the signal from the rotary encoder 14.
If the stop position of is the reference position, the set value of the setter 34
If S ₀ is the control target value S and the detected value P is within the range of S-CPS + C, if S <P, the solenoid valve 30 is opened to discharge air from the rod side air chamber 18, and when S <P, If not, the solenoid valve 28 is opened, air is supplied from the compressor 27 to the rod side air chamber 18, the control device 33 judges that the press has stopped, and the signal from the rotary encoder 14 causes the stop position of the upper die 12 to be the reference position. In other cases, the detected value P ₀ of the air pressure in the rod side air chamber 18 at the time of stopping the press is set as the control target value S, and the detected value P is S-C.
If S <P, so that it is within the range of PS + C (P = P ₀ when the press is stopped, but P ≠ P ₀ when air escapes from the rod side air chamber 18) Open 30 to discharge air from the rod side air chamber 18, and if S <P, open the solenoid valve 28 to open the compressor.
By supplying air to the rod side air chamber 18 from 27, the air in the rod side air chamber 18 after press stop is optimized until the control power supply of the power supply device 26 is turned off.

In this way, the setting device 33 allows the counterbalance cylinder 16 to be (I) before starting the press, (II) during the press operation, and (III) at the reference position of the press (or the upper die 12) and at a position other than the reference position. The air pressure in the rod side air chamber 18 can always be automatically optimized.

The present invention is not limited to the above-mentioned embodiment,
It goes without saying that various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the counter balance cylinder pressure control device for a press of the present invention, by using electric means,
Before starting the press, during press operation, when the upper die stops at the reference position, and when it stops at a position other than the reference position, the control target pressure is changed by identifying each of these cases. At the same time, the air pressure in the counterbalance cylinder can be automatically maintained properly at all times. For example, even when the mold is replaced, the air pressure can be automatically optimized immediately after the mold is replaced. Therefore, various excellent effects such as setting and optimizing the air pressure in the counter balance cylinder can be achieved easily and accurately.

[Brief description of drawings]

1 is an explanatory view of an embodiment of the present invention, FIG. 2 is an operation explanatory view of FIG. 1, FIG. 3 is an explanatory view of a general press, and FIG. 4 is an IV-IV arrow of FIG. A perspective view and FIG. 5 are explanatory views of a conventional example. In the figure, 8 is a clutch, 12 is an upper die, 14 is a rotary encoder, 16 is a counter balance cylinder, 18 is a rod side air chamber, 26 is a power supply device, 27 is a compressor, 28 is a solenoid valve, 29 is a flow path, 30 is a solenoid valve, 31 is a flow path, 32 is a pressure gauge, 33 is a control device, and 34 is a setting device.

Claims (1)

[Claims] 1. A rod-side air chamber of a counterbalance cylinder of a press is connected to a flow path equipped with a solenoid valve for supplying air from a compressor and a flow path equipped with a solenoid valve for discharging air. Further, a pressure gauge for detecting pressure when the press is stopped is attached to the rod-side air chamber, the pressure gauge and a setting device for setting a pressure with respect to a reference position of the rod-side air chamber, and a power supply device for the press, and Before inputting the signals from the press clutch and the rotary encoder of the press,
And, during the press operation, and at the time of stop at the reference position of the press, and at the time of stop at other than the reference position of the press, determine the control target pressure for each of these cases, based on the control target pressure, A counterbalance cylinder pressure control device for a press, comprising a control device that sends a control signal to each of the solenoid valves so as to optimize the pressure in the rod-side air chamber.