JP2018114526A - Oil mist supply method and punch press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supply method for reliably supplying oil mist of an appropriate quantity for a punch mold in a punch press and to provide the punch press.SOLUTION: A method for supplying oil mist from a striker which can freely strike and is freely movable vertically with respect to a punch mold provided on a punch press includes: a process of preliminarily supplying a predetermined quantity of oil from an oil supply path 27 into a first air circuit 17 formed by connecting a compressed air source 15 and an air ejection port 13 of the striker 11 before striking the punch mold 7 with the striker 11; and a process of supplying air to the first air circuit 17 and supplying the preliminarily supplied oil to the punch mold 7 when the striker 11 strikes the punch mold 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method and a punch press for supplying oil mist to a punch die provided in an upper die holder in a punch press so as to be movable up and down. More specifically, the present invention relates to an oil mist supply method and a punch press that can stably supply oil mist to a punch die.

  For example, in a punch press such as a turret punch press, oil mist is supplied from a vertically movable striker that presses the punch die to a punch die that is provided on an upper holder such as an upper turret so as to be movable up and down. (For example, refer to Patent Document 1).

Japanese Patent No. 4002793

  Patent Document 1 describes that oil mist is supplied to a punch die by controlling opening and closing of an on-off valve provided in an air blow circuit under the control of an ejection timing control unit. Japanese Patent Application Laid-Open No. H10-228688 describes that the amount of oil mist discharged is controlled by controlling the opening time of an on-off valve provided in a connection circuit connected to an oil tank under the control of an ejection amount control unit. ing.

  The configuration described in Patent Document 1 opens the on-off valve provided in the air blow circuit, generates a negative pressure in the negative pressure generator provided in the air blow circuit, and sucks oil from the oil tank into the air blow circuit. It is the structure to do. Therefore, when the striker moves up and down at high speed and repeats the punching pressure of the punch mold, the ON / OFF of the on-off valve is repeated at high speed. At this time, the oil supply from the oil tank cannot follow the air supply of the air blow, and the pressure in the air blow circuit changes due to the deviation of the follow-up, so that the pressure generated in the negative pressure generator is not stabilized and the appropriate amount of oil is supplied. May not be able to supply. Therefore, when the punching pressure of the punching die is repeated at a high speed, there is a problem that an appropriate amount of oil mist is poorly ejected, and in some cases, the oil mist cannot be ejected.

The present invention has been made in view of the above-described problems, and the punch mold can be pressed and moved up and down with respect to the punch mold provided in the upper mold holder of the punch press so as to be movable up and down. A method of supplying oil mist from a striker,
(A) A step of supplying a predetermined amount of oil in advance from an oil supply path into a first air circuit in which a compressed air source and an air outlet of the striker are connected before the punch die is pressed by the striker. ,
(B) supplying the air to the first air circuit when the striker presses the punch mold, and supplying the pre-supplied oil to the punch mold;
Each process is provided.

  The oil mist supply method may further include a step of supplying only air into the striker when supplying oil to the first air circuit.

  The upper die holder is provided with a striker that can be freely moved up and down, and a striker that can be moved up and down, and an air outlet for supplying air to the punch die. A punch press comprising a mixer for mixing oil and air in a first air circuit connecting a compressed air source and an air outlet of the striker, and supplying oil from an oil tank to the mixer And a second air circuit connected to the first air circuit between the mixer and the striker.

In the punch press, the first air circuit is provided with a first solenoid valve that can freely cut off the air circuit, and the oil supply circuit is provided with a second solenoid valve that can freely cut off the supply circuit. The second air circuit is provided with a third solenoid valve capable of freely communicating and disconnecting the air circuit, and a solenoid control device for controlling ON / OFF of each solenoid valve,
The solenoid control device includes a first solenoid valve control means for turning on the first solenoid valve in response to a timing at which the striker in the punch press presses the punch mold, and the ON state of the first solenoid valve Third solenoid valve control means for turning off the third solenoid valve; and second solenoid valve control means for turning on the second solenoid valve when the first solenoid valve is turned off.

  In the punch press, the solenoid control device includes time control means for controlling the ON time of the second solenoid valve corresponding to the diameter of the punch die.

  The upper die holder is provided with a striker that can be freely moved up and down, and a striker that can be moved up and down, and an air outlet for supplying air to the punch die. A punch press comprising a mixer for mixing oil and air in a first air circuit connecting a compressed air source and an air outlet of the striker, and supplying oil from an oil tank to the mixer An oil supply circuit for supplying a predetermined amount of oil from an oil supply path in advance into a first air circuit in which a compressed air source and an air outlet of the striker are connected before the punch mold is pressed by the striker. When the striker presses the punch mold, air is supplied to the first air circuit, and the previously supplied oil is supplied to the punch mold.

  In the punch press, a predetermined amount of oil is supplied in advance from an oil supply circuit into a first air circuit that connects a compressed air source and an air outlet of the striker before the punch die is pressed by the striker. When the striker presses the punch die, the air is supplied to the first air circuit, the pre-supplied oil is supplied to the punch die, and the air is supplied to the first air circuit. In this configuration, only air is supplied from the second air circuit between the air striker and the striker.

  In the punch press, there is an overlap between the timing of supplying oil to the mixer and the timing of supplying air from the second air circuit into the striker after the supply of air to the first air circuit. It is a certain configuration.

  According to the present invention, a predetermined amount of oil is supplied in advance into the first air circuit connected to the air outlet of the striker before the striker presses the punch die. Therefore, there is no decrease in the amount of oil supplied or the supply cannot be stopped, and a predetermined amount of oil mist can be easily ejected.

It is explanatory drawing which showed notionally and schematically the structure of the punch press which concerns on embodiment of this invention. It is a time chart which shows the operation | movement relationship of each solenoid in a 1st, 2nd, 3rd solenoid valve.

  Referring to FIG. 1, a punch press 1 according to an embodiment of the present invention includes an upper mold holder 3 corresponding to an upper turret in a turret punch press, for example. Furthermore, a lower mold holder 5 corresponding to the lower turret is provided. A punch die 7 is supported by the upper die holder 3 so as to be movable up and down, and a die die that presses a plate-like workpiece W in cooperation with the punch die 7 is supported by the lower die holder 5. A mold 9 is provided. Further, the punch press 1 is provided with a striker 11 capable of freely pressing the punch die 7 so as to move up and down.

  The striker 11 is provided with an air jet 13 for jetting and supplying oil mist to the punch die 7 when the punch die 7 is pressed. In order to eject air from the air outlet 13, the air outlet 13 and the compressed air source 15 are connected via a first air circuit 17. The first air circuit 17 is provided with a regulator 19 and is provided with a first solenoid valve 21 that can freely communicate with the first air circuit 17.

  Further, the first air circuit 17 is provided with a mixer 23 for mixing the oil supplied from the oil tank T and the air supplied from the compressed air source 15. A check valve 25 is provided between the mixer 23 and the striker 11.

  The first solenoid valve 21 is normally held in a state where the first air circuit 17 is shut off (closed state). When the first solenoid SOL1 provided in the first solenoid valve 21 is turned on, the first air circuit 17 is communicated. Therefore, the communication cut-off of the first air circuit 17 is performed by turning on / off the solenoid valve 21.

  In order to supply oil from the oil tank T to the mixer 23, the oil tank T and the mixer 23 are connected by an oil supply circuit 27. One end of the oil supply circuit 27 is immersed in the oil in the oil tank T. The oil supply circuit 27 is provided with a second solenoid valve 35 that can communicate and cut off the oil supply circuit 27, and a valve block 33 that includes a throttle valve 29 and a check valve 31. If the throttle valve 29 is disposed on the primary side of the second solenoid valve 35, the pressure suddenly drops at the throttle portion, and cavitation may occur and oil may not flow. It is desirable to arrange on the next side.

  The second solenoid valve 35 is normally in a state in which the oil supply circuit 27 is shut off, and when the second solenoid SOL2 provided in the second solenoid valve 35 is turned on, the oil supply circuit 27 is maintained in a continuous normal state. Is. Therefore, by controlling the ON time of the second solenoid SOL2 in the second solenoid valve 35, the amount of oil supplied in advance to the mixer 23 can be controlled.

  In order to apply an air pressure in the oil tank T, a branch connection path 39 branched from the first air circuit 17 is provided. A regulator 41 is disposed on the branch connection path 39. The end of the branch connection path 39 is connected to the oil tank T. Therefore, a constant air pressure is applied in the oil tank T, and the oil tank T is in a pressurized state for supplying oil to the oil supply circuit 27. Here, the air pressure applied in the oil tank T is set to be lower than the air pressure in the first air circuit 17.

  In the first air circuit 17, the air is branched from between the regulator 19 and the first solenoid valve 21 in the first air circuit 17 in order to supply air between the check valve 25 and the striker 11. A second air circuit 43 is provided. A third solenoid valve 45 is disposed in the second air circuit 43. The second air circuit 43 is connected to the first air circuit 17 via the check valve 46 between the check valve 25 and the striker 11.

  The third solenoid valve 45 is normally in a state where the second air circuit 43 is shut off. When the third solenoid SOL3 provided in the third solenoid valve 45 is turned on, the second air circuit 43 is communicated. Therefore, when the third solenoid SOL3 is turned on, the air from the compressed air source 15 is supplied between the check valve 25 and the striker 11.

  Therefore, a very small amount of oil remaining in the circuit between the check valve 25 and the air outlet 13 of the striker 11 by the supplied air becomes oil mist from the air outlet 13 of the striker 11. Erupted. Therefore, when supplying oil from the oil supply circuit 27 to the mixer 23, the first solenoid SOL1 of the first air circuit 17 is OFF, and the air circuit supplied from the first solenoid valve 21 to the mixer 23 is 17 Therefore, the back pressure due to the pressure of the air circuit 17 supplied into the mixer 23 is eliminated, and the pressure in the mixer 23 is equal to the atmospheric pressure. Therefore, the supply of oil from the oil supply circuit 27 to the mixer 23 does not stop or become unstable, and can be performed quickly, smoothly and accurately.

  That is, when the second solenoid SOL2 in the second solenoid valve 35 is turned ON for a predetermined time and a predetermined amount of oil is supplied to the mixer 23, an appropriate amount of oil to be used for a predetermined number of hitting pressures is set. It can be supplied in advance. When the first solenoid SOL1 in the first solenoid valve 21 is turned on and oil mist is ejected from the air outlet 13 of the striker 11, an appropriate amount of oil is used for a predetermined number of times of pressure by the second solenoid SOL2. Is supplied in advance, and the second solenoid SOL2 is OFF, so that there is no shortage of oil mist discharge relative to the ON operation of the first solenoid SOL1.

  In order to control ON / OFF of the solenoids SOL1, SOL2, and SOL3 in the solenoid valves 21, 35, and 45, the punch press 21 includes a solenoid control device 47. The solenoid control device 47 is constituted by a computer, for example, and includes first solenoid control means 49 for controlling ON / OFF of the first solenoid SOL1 in the first solenoid valve 21.

  The solenoid control device 47 includes second solenoid control means 51 for controlling the second solenoid SOL2 in the second solenoid valve 35, and controls ON / OFF of the third solenoid SOL3 of the third solenoid valve 45. Third solenoid control means 53 is provided.

  The solenoid control means 47 is connected to an NC control device 55 that controls the operation of the punch press 1. Then, as shown in FIG. 2, the first solenoid control means 49 controls the third solenoid SOL3 to be ON and the first solenoid SOL1 not to be ON while the second solenoid SOL2 is ON. The first solenoid SOL1 is turned on under the condition that both the second solenoid SOL2 and the third solenoid SOL3 are off. At that time, the vertical movement position signal of the striker 11 input from the NC controller 55 (this movement signal is sent from a position detection sensor (for example, a rotary encoder) provided in an actuator (for example, a servo motor) that moves the striker 11 up and down. With reference to the position detection signal), the striker 11 has a function of turning on the first solenoid SOL1 at the timing when the punch die 7 is pressed.

  In other words, the first solenoid control means 49 is configured such that when the striker 11 is lowered after hitting the punch die 7, the first solenoid is controlled only for a time corresponding to the time when the striker 11 is in contact with the punch die 7. SOL1 is turned on.

  The second solenoid control means 51 has a function of controlling the ON time of the second solenoid SOL2 corresponding to the large, medium and small punch molds 7 to be used. That is, when large, medium, and small data of the punch mold 7 to be used is input from the NC control device 55, the ON time is set in advance corresponding to the large, medium, and small dimensions of the punch mold 7. A parameter is selected from the parameter memory 57. That is, in order to supply the mixer 23 with an appropriate amount of oil to be used for a predetermined number of hitting pressures corresponding to the large, medium, and small sizes of the punch mold 7, corresponding to the large, medium, and small sizes of the punch mold 7. The second solenoid SOL2 is turned on for a time corresponding to the selected parameter.

  In other words, the parameters constitute a kind of time control means for controlling the ON time of the second solenoid SOL2. The ON operation of the second solenoid SOL2 is controlled on condition that the first solenoid SOL1 is turned OFF.

  The third solenoid control means 53 supplies compressed air between the check valve 25 and the striker 11 in the first air circuit 17, and a circuit between the check valve 25 and the air outlet 13 of the striker 11. It has a function of ejecting a very small amount of oil remaining therein as an oil mist from the air ejection port 13 of the striker 11. As shown in FIG. 2, the third solenoid control means 53 has a function of repeating ON / OFF of the third solenoid SOL3 while the second solenoid SOL2 is ON. If the ON time of the second solenoid SOL2 is known in advance, the ON / OFF of the third solenoid SOL3 may be repeated every predetermined time. Then, with reference to the vertical movement position signal of the striker 11 input from the NC control device 55, in a predetermined predetermined position range in the vicinity of the lowering position (lowering end position) where the striker 11 strikes the punch die 7. As shown in FIG. 2, the third solenoid SOL3 is turned OFF.

  In the above-described configuration, the workpiece W is pressed by the punch die 7 and the die die 9 by moving the striker 11 up and down and hitting the punch die 7 under the control of the NC controller 55. Is to be done. At this time, the second solenoid SOL2 of the second solenoid valve 35 is turned ON corresponding to the large, medium, and small sizes of the punch die 7, and a predetermined number of times corresponding to the large, medium, and small sizes of the punch die 7. An appropriate amount of oil to be used for the striking pressure is supplied from the oil tank T to the mixer 23 in advance.

  As described above, when oil is supplied from the oil tank T to the mixer 23 in advance, the first solenoid valve 21 is closed, and a slight amount of oil between the check valve 25 and the air outlet 13 is supplied to the second air. The air supplied from the circuit 43 is ejected as oil mist. Therefore, when oil is supplied from the oil tank T to the mixer 23, the back pressure due to the pressure of the air circuit 17 supplied into the mixer 23 is eliminated, so that a predetermined amount of oil can be supplied smoothly. That is, an appropriate amount of oil used for the predetermined number of times of punching corresponding to the large, medium, and small punch molds 7 can be accurately supplied to the mixer 23 in advance.

  When the striker 11 strikes the punch die 7, the first solenoid SOL <b> 1 of the first solenoid valve 21 is appropriately turned on corresponding to the timing when the striker 11 strikes the punch die 7. Accordingly, an appropriate amount of oil used for the predetermined number of times of pressure supplied in advance to the mixer 23 is mixed with the air in the first air circuit 17 and supplied to the punch die 7 as oil mist. Therefore, the punch die 7 is lubricated by an appropriate amount of supplied oil mist without insufficient oil discharge with respect to a predetermined number of hitting pressures.

  As described above, when the first solenoid SOL1 of the first solenoid valve 21 is turned on and the oil mist is ejected, the third solenoid SOL3 is turned on after the first solenoid SOL1 is turned off as shown in FIG. ON is activated. Therefore, a small amount of oil mist that tends to remain between the check valve 25 in the first air circuit 17 and the air outlet 13 of the striker 11 is ejected from the air outlet 13.

  Therefore, next, when the second solenoid SOL2 is turned on to supply an appropriate amount of oil to be used for a predetermined number of times of pressure to the mixer 23 in the first air circuit 17, the first solenoid SOL1 is turned off. Therefore, the air pressure in the mixer 23 is equal to the atmospheric pressure and does not act as a back pressure. Therefore, an appropriate amount of oil corresponding to the ON operation of the second solenoid SOL2 can be supplied to the mixer 23 in advance.

  As described above, when oil is supplied to the mixer 23, it is desirable that the ON operation of the second solenoid SOL2 and the ON operation of the first solenoid SOL1 do not overlap as shown in FIG. . That is, when oil is supplied to the mixer 23, back pressure due to air pressure does not occur in the mixer 23, and the third solenoid SOL3 is turned ON between the check valve 25 and the air outlet 13 of the striker 11. The remaining oil and the air in the second air circuit 43 are mixed and ejected as oil mist, and the oil mist can be supplied to the punch die even while the oil is supplied by the ON operation of the second solenoid SOL2. At this time, since the pressure in the mixer 23 is substantially equal to the atmospheric pressure, an appropriate amount of oil used for a predetermined number of times of striking can be supplied. An appropriate amount of oil mist is supplied to the punch die 7 almost simultaneously with the striker 11 hitting the punch die 7 by always operating either the first solenoid SOL1 or the third solenoid SOL3. .

  As described above, after supplying an appropriate amount of oil to be used for the predetermined number of times of pressure to the mixer 23, as described above, the first solenoid SOL1 of the first solenoid valve 21 is turned ON, and the striker 11 is turned on. Oil mist is supplied to the punch die 7 almost simultaneously with the punch die 7 being pressed.

  By the way, the vertical movement of the striker 11 in the punch press is repeated at high speed. Accordingly, the supply of oil to the mixer 23 in the first air circuit 17 is also repeated at a high speed. At this time, since the air supply to the mixer 23 of the first air circuit 17 is also performed at high speed, the air supply pressure may act as a back pressure on the mixer 23 in some cases. Therefore, the oil supply by the oil supply circuit to the mixer 23 is likely to remain, or the supply is likely to fluctuate. Therefore, the amount of oil mist supplied to the punch die 7 may become unstable.

  However, in the present embodiment, as described above, when the second solenoid valve 35 is turned on to supply oil, the first solenoid valve 21 is always turned off. In the meantime, the oil mist is ejected to the punch die by turning on the third solenoid valve 45. Then, the second solenoid valve 35 is turned on by supplying the oil to the mixer 23 in the OFF state of the first solenoid valve 21 in which the back pressure due to the air supply by the first solenoid valve 21 to the mixer 23 is not generated. Therefore, an appropriate amount of oil to be used for the predetermined number of times of pressure can be supplied to the mixer 23. As described above, after the oil is supplied to the mixer 23 in advance, the first solenoid valve 21 is turned on. Therefore, it is difficult for the oil supply amount to fluctuate, and the above-described problems can be solved.

  The first solenoid valve 21 and the third solenoid valve 45 are preferably provided with a silencer so that air can be discharged at high speed when OFF so that high-speed response is possible.

DESCRIPTION OF SYMBOLS 1 Punch press 7 Punch metal mold 11 Striker 13 Air outlet 15 Compressed air source 17 1st air circuit 21 1st solenoid valve 23 Mixer 27 Oil supply circuit 35 2nd solenoid valve 39 Branch connection path 43 2nd air circuit 45 3rd Solenoid valve 47 Solenoid controller 49 First solenoid controller 51 Second solenoid controller 53 Third solenoid controller 55 NC controller

Claims (8)

A method of supplying oil mist from a striker that is capable of striking and vertically moving the punch mold, with respect to a punch mold that is provided in an upper mold holder in a punch press so as to be movable up and down.
(A) A step of supplying a predetermined amount of oil in advance from an oil supply path into a first air circuit in which a compressed air source and an air outlet of the striker are connected before the punch die is pressed by the striker. ,
(B) supplying the air to the first air circuit when the striker presses the punch mold, and supplying the pre-supplied oil to the punch mold;
An oil mist supply method comprising the steps of:   2. The oil mist supply method according to claim 1, further comprising a step of supplying only air into the striker when oil is supplied to the first air circuit. Method.   A punch having a striker that can freely move up and down a punch die that is provided in the upper die holder so as to be movable up and down, and an air outlet for supplying air to the punch die. A press is provided with a mixer for mixing oil and air in a first air circuit in which a compressed air source and an air outlet of the striker are connected, and for supplying oil from an oil tank to the mixer A punch press comprising an oil supply circuit and a second air circuit connected to the first air circuit between the mixer and the striker. 4. The punch press according to claim 3, wherein the first air circuit is provided with a first solenoid valve capable of interrupting communication of the air circuit, and the oil supply circuit is provided with a second solenoid valve capable of interrupting communication of the supply circuit. The second air circuit is provided with a third solenoid valve capable of freely connecting and disconnecting the air circuit, and a solenoid control device for controlling ON / OFF of each solenoid valve,
The solenoid control device includes a first solenoid valve control means for turning on the first solenoid valve in response to a timing at which the striker in the punch press presses the punch mold, and the ON state of the first solenoid valve And third solenoid valve control means for turning off the third solenoid valve; and second solenoid valve control means for turning on the second solenoid valve when the first solenoid valve is turned off. A punch press.   5. The punch press according to claim 4, wherein the solenoid control device includes time control means for controlling an ON time of the second solenoid valve corresponding to a diameter of the punch die. Punch press.   A punch having a striker that can freely move up and down a punch die that is provided in the upper die holder so as to be movable up and down, and an air outlet for supplying air to the punch die. A press is provided with a mixer for mixing oil and air in a first air circuit in which a compressed air source and an air outlet of the striker are connected, and for supplying oil from an oil tank to the mixer An oil supply circuit is provided, and a predetermined amount of oil is supplied in advance from an oil supply path into a first air circuit in which a compressed air source and an air outlet of the striker are connected before the punch die is pressed by the striker. When the striker hits the punch mold, air is supplied to the first air circuit, and pre-supplied oil is supplied to the punch mold. .   4. The punch press according to claim 3, wherein a predetermined amount of oil is supplied from an oil supply circuit into a first air circuit in which a compressed air source and an air outlet of the striker are connected before the punch die is struck by a striker. When air is supplied in advance and the striker presses the punch die, air is supplied to the first air circuit, oil supplied in advance is supplied to the punch die, and air is supplied to the first air circuit. Further, a punch press characterized in that only air is supplied from the second air circuit between the mixer and the striker.   8. The punch press according to claim 7, wherein after the supply of air to the first air circuit, between the timing of supplying oil to the mixer and the timing of supplying air from the second air circuit into the striker. Is a punch press characterized by overlapping.

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