JP3542724B2 - Centralized lubrication method and apparatus for forging press machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a centralized lubrication method and an apparatus for supplying lubricating oil from a single location to a plurality of required locations such as a bearing portion of a forging press.
[0002]
[Prior art]
A centralized lubricating device in a forging press of this type uses a lubricating oil from a tank by an oil supply pump as disclosed in Japanese Patent Application Laid-Open No. 1-279200 (JP-A-1) and Japanese Patent Application Laid-Open No. 3-285800 (JP-A-2). The lubricant is pumped out and the lubricating oil is guided to a required lubrication point of the forging press through a distribution valve.
[0003]
In this centralized lubrication device, it is necessary to supply an appropriate amount of lubrication to each lubrication point. If the lubrication is inappropriate, a seizure phenomenon occurs. This improper lubrication is caused by abnormalities in the piping system such as crushing of pipes, loosening / dropping of pipe joints, abnormalities of oil supply pumps, abnormalities of distribution valves, and insufficient oil in oil tanks.
[0004]
For this reason, a technique for judging whether or not the refueling is appropriate has been developed. In the above publication 1, orifices are provided in each of the refueling pipes, and the pressure difference between the upstream and downstream of the orifice is detected. A technique for determining whether refueling is normal or abnormal is disclosed. Japanese Patent Application Laid-Open Publication No. 2002-115686 discloses that the number of refueling cycles (the number of strokes depending on the amount of refueling) of each distribution valve and the number of strokes (the number of operations) of a refueling pump are detected, and the normal or abnormal refueling is determined by comparing the detected values. A technique for performing this is disclosed.
[0005]
All of these technologies stop the forging press when an abnormality is detected. In addition, in general, in addition to the detection of lubrication abnormality, a temperature sensor is attached to a required portion including the above-described lubrication point of the forging press machine, and even when the sensor detects an abnormal temperature rise, the entire forging press machine is operated. I try to stop.
[0006]
[Problems to be solved by the invention]
In the technology described in the above publication 1, since orifices are provided in the final refueling pipe to each refueling location, the number of locations is increased, and accordingly, the number of detection signals is increased and control is complicated. Will be higher. In addition, an increase in the number of detection devices increases the probability of failure.
[0007]
The technique disclosed in the above publication 2 connects each distribution valve and a refueling pump via an on-off valve, and opens and closes each of the on-off valves appropriately to selectively lubricate each distribution valve. Sometimes, the difference between the number of strokes of the distribution valve and the number of strokes of the oil supply pump, that is, the difference between the former oil supply amount and the latter discharge amount is detected. For this reason, if a certain on-off valve opens and closes, the whole oil supply amount fluctuates, and accordingly, the discharge amount of the oil supply pump must be increased or decreased. The number of strokes of the refueling pump must be optimized in response to the increase or decrease in the discharge amount, and the control is complicated. Further, the operation of opening and closing the on-off valve is troublesome, which also complicates the control.
[0008]
Further, the technology described in Publication 2 is intended for a large-sized sheet metal press machine, and the large-sized sheet metal press machine has hundreds of lubricating points, some of which need not always be refueled. There is a technology that can stop refueling by an on-off valve, as in the same technology. However, the forging press machine is largely different in lubricating amount from its attached equipment, for example, a transfer device. Generally, a lubricating device is provided in the press machine alone, and the lubrication is always performed. For this reason, the technique disclosed in Publication 2 is not suitable.
[0009]
Further, the viscosity of the lubricating oil changes depending on the operating environment such as room temperature. Particularly, in a hot forging press, the temperature changes greatly and the viscosity varies greatly. Also, different viscosities are used in summer and winter. Fluctuations in viscosity affect the discharge rate of the refueling pump, and therefore, the technique described in Japanese Patent Application Laid-Open Publication No. H11-143, which uses that flow rate as a reference, must make a correction according to the fluctuation in viscosity. In addition, since the fluctuation in viscosity causes a fluctuation in the pressure difference between the upstream and downstream of the orifice, the technique described in Japanese Patent Application Laid-Open Publication No. 2003-133873 also needs to be corrected.
[0010]
Both of the techniques described in the above publications detect a refueling abnormality and do not achieve stable refueling. In particular, when an abnormality is detected, it is preferable that the forging press machine be immediately stopped. However, if the forging press is stopped during the processing of the product, the one that is being processed becomes a defective product (Oshaka). Therefore, it is more preferable that the forging press can be operated without any trouble until the processing is completed.
[0011]
It is an object of the present invention to perform stable refueling and detect an abnormality.
[0012]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention first provides a centralized lubrication system of this type in which, if an inconvenience (abnormality) occurs at one point in a lubrication circuit, the inconvenience affects the whole area, and In view of the fact that the closer to the refueling point of the forging press, the larger the closer, the abnormalities are detected by a failure of one distribution valve for distributing the lubricating oil to the refueling point.
[0013]
Next, in consideration of the fact that it is not necessary to immediately stop the entire device if an appropriate amount is supplied to the refueling point even if a problem occurs in the refueling circuit, the present invention employs a variable discharge type If the number of set cycles of the distribution valve is G and the actual number of cycles is H, for example, G / H = 1 so that the refueling cycle (refueling amount) of the distribution valve is constant. The discharge amount of the pump was controlled. In this constant control, when the viscosity of the lubricating oil changes and the discharge amount of the oil supply pump changes, the oil supply cycle of the distribution valve also changes, and based on this change, the oil supply pump is controlled and the discharge amount is increased or decreased. Thus, the refueling amount of the distribution valve is kept constant. That is, an appropriate amount of fuel is always supplied to each refueling point.
[0014]
The G / H ratio can be constantly recorded, and an abnormality can be detected early and a warning can be given from the history curve. Until G / H = 1 (G> H) at the beginning of operation or the like, there is no need to perform control to set G / H = 1. Control becomes possible.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
As one embodiment of the centralized lubrication method in the forging press of the present invention, when lubricating oil is sent from a refueling pump having a variable discharge amount to a plurality of distribution valves and each distribution valve supplies oil to each lubrication point of the forging press. A configuration may be adopted in which the oil supply pump is controlled so that the discharge amount is variable so that at least one oil supply cycle of the distribution valve is constant.
[0016]
In the above configuration, the oil supply pump can be controlled so that the discharge amount thereof is variable so that the average value of all oil supply cycles of the distribution valve is constant. In this way, if all the distribution valves are targeted, the abnormality detection is also performed in the entire range, and the accuracy is improved. On the other hand, it is also possible to search all the refueling cycles of the distribution valve one after another in a circulating manner at regular intervals, and control them so as to be constant.
[0017]
Further, if the oil supply from the oil supply pump to the abnormal oil supply point is increased via the bypass pipe by the abnormality detection signal of the abnormality detection sensor provided at the oil supply point of the forging press machine, lubrication of the abnormal point can be achieved. The effect can be improved, and the cause of the failure can be eliminated quickly. At this time, since the number of cycles of the distribution valve is reduced by the increase, the refueling pump is controlled to increase the discharge amount, and the refueling amount at other refueling points does not decrease.
[0018]
As one embodiment of the centralized lubrication device of the forging press of the present invention, a plurality of distribution valves are connected to a discharge amount variable oil supply pump, and an oil supply pipe is led from each distribution valve to each oil supply point of the forging press, In the centralized lubrication device of the forging press for feeding the lubricating oil to each lubrication point via the distribution valve by driving the oil supply pump, at least one of the distribution valves is provided with a counter for the number of actuations of the distribution valve, The count meter may be connected to a controller of the refueling pump, and the controller may employ a configuration for controlling the discharge amount of the refueling pump so that the count of the counter is constant.
[0019]
In this configuration, the count meters are provided in all of the distribution valves, and the respective count meters are connected to the controller of the refueling pump, and the controller has a constant average value of the counts of the respective count meters as described above. It is possible to control the discharge amount of the refueling pump so that an abnormality detection sensor is provided at an arbitrary refueling point of the forging press, and the detection sensor is connected to the controller. By providing a bypass pipe interposed with an on-off valve at the refueling point from the refueling pump, the on-off valve is opened and the refueling point is refueled via the bypass pipe in the same manner as described above in response to an abnormality signal from the detection sensor. Can be increased.
[0020]
In addition, a main distribution valve is interposed between the distribution valve and the refueling pump, and an oil pipe is branched from the main distribution valve to each distribution valve. A configuration may be adopted in which a bypass pipe is connected through a switching valve, and the switching valve is opened and closed by the controller.
[0021]
With this configuration, by opening an on-off valve, it is possible to increase the refueling amount of the arbitrary distribution valve. This increase is performed by an increase signal such as an abnormality detection signal of a refueling point that the distribution valve handles. Also at this time, similarly to the above, the discharge amount of the refueling pump is increased, and there is no problem in refueling the other distribution valves. Incidentally, the main distribution valve is provided in order to send a different amount of oil to each distribution valve.
[0022]
【Example】
One embodiment is shown in FIG. 1. In this embodiment, a main distribution valve 1 is connected to a refueling pump P, and a required number of sub distribution valves 3 ₁ , 3 ₂ . 3n (n = 1, 2,...), And an oil supply pipe is led from each of the sub-distribution valves 3 ₁ ... To necessary places a ₁ , a _2, ... An (general symbol: a) of the hot forging press. I have. The oil supply pump P is connected to the tank T via the strainer 4, and when driven by the motor M via the coupling 5, the lubricating oil in the tank T is sent to the main distribution valve 1, and the main distribution valve From 1 the required amount is distributed to the sub-distribution valves 3 ₁ , 3 _2, ... From the sub-distribution valve 3, the oil is further distributed to a required amount and supplied to each refueling point a of the forging press.
[0023]
In part 3 ₁ sub dispensing valve 3 are attached cycle switch 6, the switch 6, the sub-dispensing valve 3 _first driving cycle H is counted. This counting is performed by turning on / off the switch 6 and input to the controller 7. The controller 7, the main distributing valve 1, all the oil circuit including the secondary distributing valve 3 are the number of cycles G sub dispensing valve 3 ₁ stored in the case of normal, the actual this set value G The value H is compared (G / H is calculated).
[0024]
The motor M is provided with an inverter 8. By changing the output Hz of the inverter 8, the rotation speed of the motor M changes and the discharge amount of the pump P changes. A control signal from the controller 7 is input to the inverter 8, and the output Hz number of the inverter 8 is controlled by the signal so that G / H = 1. That is, if G / H> 1, the number of Hz is increased to increase the ejection amount, and if G / H <1, the number of Hz is decreased to decrease the ejection amount so that the measured value H matches the set value G ( It is controlled so that the measured value H is constant. For example, if the distribution valves 1 and 3 and the pump P reduce the refueling amount and the discharge amount due to friction or the like, the G / H increases (> 1), so that the controller 7 controls the discharge of the pump P via the inverter 8. G / H = 1 is maintained by increasing the volume.
[0025]
By this control, a predetermined amount of lubricating oil is always sent to each distribution valve 3, and the operation of the forging press machine is performed without any trouble such as burning. At this time, if a trouble occurs in the refueling circuit for some reason, the G / H value fluctuates. If the fluctuation width is large (exceeds the set width), for example, exceeds ± 20%, the controller 7 issues an alarm. Is issued, and a stop signal for sending the work to the forging press machine is issued. After a lapse of time until the work in the press machine is paid out, the press machine is stopped.
[0026]
The above embodiment has been attached to the switch 6 in only one of the sub-distributor valve 3 _1, the number is arbitrary, may be attached to the switch 6, for example, in all the sub-distributor valve 3 as shown in FIG. 2 . In this case, G and H are the average values of G ₁ , G _2, ..., H ₁ , H _2, ... Or G / H of each sub distribution valve 3, and the average value of G ₁ / H ₁ , G ₂ / H ₂ ,. Control as a value. Further, a signal from the switch 6 of each sub-distribution valve 3 is cyclically input at a certain timing, whereby each Gn / Hn is calculated and the pump P can be controlled based on each value.
[0027]
As shown in FIG. 3, a signal from an abnormality detection sensor at a certain refueling point a ₁ , for example, a temperature sensor 9 is input to the controller 7, and when the abnormality signal is input, the on-off valve 11 of the bypass pipe 10 is turned on. open to obtain if to send actively lubricant to the abnormal refueling point a _1. The bypass pipe 10 can be provided at an arbitrary refueling point a including the entirety. In the figure, 12 is a distribution valve, and 13 is a check valve. Further, as shown in FIG. 4, the bypass pipe 10 can be provided in the distribution pipe 2 from the main distribution valve 1 to the sub distribution valve 3. These bypass pipes 10 can be employed in an oil supply circuit provided with an arbitrary number of switches 6.
[0028]
【The invention's effect】
According to the present invention, as described above, stable oil supply can be performed at low cost, and abnormality detection can be performed. Further, control for stopping the entire apparatus after a certain period of time from the abnormality detection is possible, and it is not necessary to stop the apparatus during the processing of the product.
[Brief description of the drawings]
FIG. 1 is a piping diagram of one embodiment. FIG. 2 is a piping diagram of another embodiment. FIG. 3 is a piping diagram of another embodiment. FIG. 4 is a piping diagram of another embodiment.
1 Main distribution valve 2 minute piping 3, 3 ₁ ... 3n Sub distribution valve 6 Count meter (cycle switch)
7 Controller 8 Inverter 9 Abnormality detection sensor (temperature sensor)
10 bypass pipe 11 on-off valve 12 dispensing valve P oil pump T lubricating oil tank _{a, a 1, a 2 ...} an oil supply points

Claims (7)

Concentration at the variable discharge plurality of distribution valves 3 via the fuel supply pump P _1, 3 ₂ ... feeding the lubricating oil to the forging press for oil from the respective dispensing valve 3 to each lubrication point a _1, a ₂ forging press A lubrication method,
Centralized lubrication method in forging presses, characterized by varying the discharge amount by controlling the fuel supply pump P so that at least one 3 ₁ refueling cycle of the distribution valve 3 is constant. 2. The centralized lubrication method for a forging press according to claim 1, wherein said oil supply pump P is controlled so that the average value of all oil supply cycles of said distribution valves 3 ₁ . A concentrated lubrication method in a forging press machine, characterized by the following. The abnormality detection signal of the abnormality detecting sensor 9 provided refueling point a ₁ of the forging press machine, characterized by increasing the oil supply to the abnormal refueling point a ₁ through the bypass pipe 10 from the oil supply pump P A concentrated lubrication method in the forging press according to claim 1 or 2. A plurality of distribution valves 3 ₁ , 3 _2, ... Are connected to an oil supply pump P having a variable discharge amount, and an oil supply pipe is led from each distribution valve 3 to each oil supply point a ₁ , a ₂ ,. In the centralized lubrication device of the forging press, which feeds the lubricating oil to each lubrication point a through the distribution valve 3 by driving P,
At least one 3 Part dispensing valve 3 _first operating counts six to _one of said dispensing valve 3 is provided, connected to the count six to the controller 7 of the oil supply pump P, the controller 7, the A centralized lubrication device for a forging press machine, wherein the discharge amount of the oil supply pump P is controlled so that the count of the counter 6 becomes constant. 5. The centralized lubrication device for a forging press according to claim 4, wherein said counters 6 are provided in all of said distribution valves 3, and each of said counters is connected to a controller 7 of said refueling pump P. A centralized lubrication device for a forging press, wherein the discharge amount of the oil supply pump P is controlled so that the average value of the counts of the respective counters 6 is constant. An abnormality detection sensor 9 is provided at any of the refueling points a ₁ , a _2, ... Of the forging press, and the detection sensor 9 is connected to the controller 7. 11 a bypass pipe 10 interposed provided, the abnormal signal of the detection sensor 9, via the bypass pipe 10 by opening the on-off valve, and characterized in that so as to increase the oil supply of the to refueling point a ₁ The centralized lubricating device for a forging press according to claim 4 or 5. A main distribution valve 1 is interposed between the distribution valve 3 and the refueling pump P, and an oil pipe 2 is branched from the main distribution valve 1 to each of the distribution valves 3. A bypass pipe (10) between the refueling pump (P) and the main distribution valve (1) is connected via an on-off valve (11), and the on-off valve (11) is opened and closed by the controller (7). A centralized lubrication device for a forging press according to any one of the preceding claims.

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