JPH0144183Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an air control circuit that operates the feed bar of a transfer device of a press mechanism, for example, and in particular to an air control circuit that operates the feed bar in a synchronous opening and closing operation during manual operation. Regarding circuits.

[Background technology and its problems]

The two parallel feed bars that make up the transfer device of a press machine are crankshafts that move the slide up and down during automatic operation, that is, when a workpiece is being pressed using the upper mold of the slide and the lower mold of the bolt. It operates in conjunction with the rotation of. Specifically, the closing movement and raising of the fingers to clamp the workpiece, the forward movement and lowering of the workpiece to transfer it to the next process,
The opening movement to unclamp the workpiece and the backward movement to return to the previous process are repeated in order. In contrast to this automatic operation, manual operation is performed in which only the feed bar is opened and closed separately from the other constituent members and mechanisms of the press machine, for example, during mold setup work such as mold exchange and mold adjustment.

In this manual operation, if there is a difference in the movement timing or movement speed on both the left and right sides of the feed bar, 2.
The book's feed bar becomes V-shaped and the feed bar does not move smoothly, so it is necessary to move both the left and right sides of the feed bar by the same amount at the same time to ensure synchronized movement on both sides. In a press machine equipped with an equalizing shaft for synchronizing the feed bar, synchronized movement of the left and right sides of the feed bar during manual operation can be achieved by this equalizing shaft. However, as with C-frame press machines, when an equalize shaft is inserted into the frame, problems arise such as a decrease in frame rigidity and difficulty in discharging scrap generated during processing. There are some press machines that have not been adopted.

In press machines that do not employ equalizing shafts, an air control circuit is used to move both left and right sides of the feed bar synchronously during manual operation.

Fig. 2 is a plan view of a press machine in which such a conventional air control circuit is used, Fig. 3 shows the mechanical drive mechanism of the feed bar driven by this air control circuit, and Fig. 4 shows the air control circuit. It is shown. FIG. 4 also schematically shows the feed bar mechanical drive mechanism of FIG. 3. This feed bar mechanical drive mechanism and air control circuit will be explained below.

In Fig. 2, the workpiece is pressed by the vertical movement of the slide between an upper die attached to the lower surface of the slide (not shown) and a lower die 2 attached to the upper surface of the bolster 1. This is done by rotating the crankshaft. Two feed bars 3 having a length in the left and right direction are arranged in parallel above the bolster 1, and the feed bars 3, which are attached and supported by the attachment member 3A, are closed by approaching each other to clamp the workpiece with the fingers 4. After clamping the workpiece, it rises, then moves forward by a predetermined stroke to transfer the workpiece to the next process, descends, and then moves away to open and unclamp the workpiece, then retreats and returns to the previous process. . The above feed bar operation cycle is performed in conjunction with the vertical movement of the slide by the crankshaft.

As shown in Fig. 4, the air cylinders 5 provided on the left and right sides of the feed bar 3 are connected to the case 6 as shown in Fig. 3.
It is assembled and installed horizontally. The tip of the link 8 is attached to the pin 9 on the rod 7A of the piston 7 of the air cylinder 5.
This link 8 is pivotable about an axis 10 at the base. This shaft 10 serves as a swing center axis of a link mechanism 12 which together with a shaft 11 constitutes a mechanical drive mechanism of the feed bar, and a link 13 integrated with the link 8 also swings around the shaft 10. One end of a connecting rod 14 is pivotally connected to the tip of the link 13 with a pin 14A, and the tip of a link 15 that swings around the shaft 11 is pivotally attached to the other end of the connecting rod 14 with a pin 14B. 15
are connected by a connecting rod 14. A cam follower support 17 is attached to the link 16 integrated with the link 15.
is pivotally connected by pin 18. A roller 19, which is a cam follower, is attached to the shaft 19 on this cam follower support 17.
It can be mounted rotatably at A. A plate-shaped cam body 20, which is a cam member, rotates around a shaft 21, and a guide block 2 is rotatably attached to this shaft 21.
The guide protrusion 17A is slidably guided by the cam follower support 17 in FIG.
This allows the roller 19 to come into contact with and separate from the cam body 20.

Arms 22, 23 are connected to the link mechanism 12 at the shafts 10, 11, and these arms 22, 23, which extend substantially vertically, connect to the base shafts 10, 11.
It can swing around the center and is integrated with links 8, 13 and links 15, 16. Arm 2
Long grooves 22A, 23A are formed in the vertical direction at the tips of 2, 23, and two guide bars 26 are inserted into bridge members 24, 25 that are slidably engaged with the long grooves 22A, 23A. and bridge members 24, 25
The feed bar mounting member 3A is coupled to the upper surface of the feed bar mounting member 3A.

When air is supplied to the feed bar closing air chamber 5A defined by the piston 7 inside the air cylinder 5 and the piston 7 moves to the right in FIG. 3, the links 8 and 13 swing clockwise about the shaft 10. move,
Further, the links 15 and 16 swing counterclockwise about the shaft 11. For this reason, the cam follower support 17
moves to the left in FIG. 3, and the roller 19 comes into contact with the cam body 20. As the link mechanism 12 operates, the arm 22 swings clockwise about the shaft 10, and the arm 23 swings counterclockwise about the shaft 11. Therefore, the bridge members 24 and 25 approach while being guided by the guide bar 26 while being held at a constant height position by the guide bar 26.
The book feed bar is moved closed at a predetermined interval.

With the above steps, preparations for automatic operation for pressing a workpiece are complete, and the rotation of the cam body 20 against which the roller 19 is in contact due to the pressing force of the piston 7 causes the roller 19 and the cam follower support 17 to conform to the shape of the cam body 20. In Figure 3, it moves left and right. As a result, the link mechanism 12, whose one end is connected to the piston rod 7A of the air cylinder 5 and the other end is provided with a roller 19 as a cam follower, performs a deformation operation, and the link mechanism 12 has arms 22, 23, bridge members 24, 25, etc.
Two feed bars 3 connected via etc.
is opened and closed from the predetermined intervals, and the fingers 4 clamp and unclamp the workpiece. At this time, the piston 7 of the air cylinder 5 reciprocates, and this reciprocation is performed by elastically compressing the air in the air chamber 5A of the air cylinder 5. Furthermore, since the shaft 21 of the cam body 20 is connected to the crankshaft that moves the slide up and down, the cam body 20 rotates in conjunction with the crankshaft during automatic operation.
Clamping and unclamping of the workpiece is performed in conjunction with press processing by the vertical movement of the slide.

Note that FIG. 3 also shows a mechanism for raising and lowering the feed bar 3. The guide bar 26 is attached and supported on the upper part of two elevating rods 27, and the elevating rods 27 are guided by guide bosses 6A and 6B formed on the case 26 and can move up and down. The lower portions of the two lifting rods 27 are connected by a connecting member 28, and a roller 29 as a cam follower is rotatably attached to the side surface of this connecting member 28 by a shaft 29A. An air cylinder 30 for raising and lowering the feed bar is attached to the lower surface of the case 6, and the tip of the rod 31A of the piston 31 of the air cylinder 30 is connected to the connecting member 28. Shaft 2 of the cam body 20
1 is coaxially provided with a plate-shaped cam body 32. When air is supplied to the air chamber 30A of the air cylinder 30 and the piston rod 31A is moved upwardly, the roller 29 is moved by the pressing force of the piston 31 to the cam body. 32. This completes the preparation for automatic operation, and due to the shape of the cam body 32 that rotates in conjunction with the crankshaft, the roller 29 and the connecting member 2
8. The lifting rod 27 moves up and down, and thereby the guide bar 26 and the bridge members 24 and 25 also move up and down, and the feed bar 3 is raised and lowered during automatic operation. During manual operation for mold setup work, etc., the feed bar 3 is raised and lowered by supplying and discharging air to the air chamber 30A of the air cylinder 30.

Although not shown in Fig. 3, there is also a mechanism for moving the feed bar forward and backward (movement in the left-right direction in Fig. 2), and this mechanism is composed of a gear mechanism, a cam mechanism, etc. connected to the crankshaft. The feed bar is moved forward and backward by the swing of the swing arm connected to the cam mechanism.

The above feed bar closing movement in automatic driving,
The movements according to press working such as raising, advancing, lowering, opening, and retreating are set by the shape of the cam bodies 20, 32, etc.

The feed bar mechanical drive mechanism of the 12 types of link mechanisms described above is provided for each of the left and right air cylinders 5 of the feed bar 3, as shown in the schematic diagram of FIG.

As shown in FIG. 4, an air passage 3 extends from a compressor 33 which is an air pressure source for the air cylinder 5.
4 is provided with a pressure regulating valve 35 and a switching valve 36, and air passages 37 and 38 are branched at the switching valve 36 and connected to one air chamber 5A and the other air chamber 5B inside the air cylinder 5. Throttle valves 39 and 40 with check valves are interposed. These throttle valves 3
9 and 40 are the air passages 3 of the left and right air cylinders 37
The throttle valve 39 in the air passage 37 is for adjusting the feed bar opening speed during manual operation, and the throttle valve 40 in the air passage 38 is also for adjusting the feed bar closing speed during manual operation. . The above pressure regulating valve 35, switching valve 36, and throttle valve 39, 40
An air circuit consisting of the following is incorporated into the press machine as an air control unit 41.

The opening/closing movement of the two feed bars 3 during manual operation for carrying out the above-mentioned mold setup work etc. is performed by moving the piston 7 of the air cylinder 5. That is, when the switching valve 36 for switching the opening and closing of the feed bar 3 is switched to the position shown in FIG. As a result, the two feed bars 3 are opened and moved. At this time, the retraction speed of the piston 7, in other words, the opening speed of the feed bar 3 is adjusted by operating the throttle valve 39. The two feed bars 3 are closed by the air cylinder 5 by switching the switching valve 36.
This is done by supplying air to the air chamber 5A to move the piston 7 forward, and the forward speed of the piston 7, in other words, the closing speed of the feed bar 3 is adjusted by operating the throttle valve 40.

In the conventional air control circuit described above, the synchronous movement of the left and right sides of the feed bar 3 during manual operation is controlled by the throttle valves 39 provided for each of the left and right air cylinders 5.
This was done by adjusting the air flow rate by operating 40. However, by switching the switching valve 36, the air chambers 5A and 5B of the air cylinder 5 to which air pressure for pressing the piston is supplied are reversed, causing a pressure change in both air chambers 5A and 5B, and the pressure regulating valve It has been difficult to move the pistons 7 of the left and right air cylinders 5 by the same amount at the same time due to fluid characteristics such as a drop in air pressure due to pipe loss from the air cylinder 35 to the air cylinder 5. For this reason, the piston 7 of one of the left and right air cylinders 5 may move faster than the other piston 7, and a lot of work time is wasted to move both the left and right sides of the feed bar 3 in synchronization. .

[Purpose of invention]

The purpose of this invention is to easily and reliably achieve synchronized movement on both the left and right sides of the feed bar during manual operation, thereby shortening work time such as mold setup, and improving work efficiency. This is where the air control circuit is provided.

[Means and actions for solving problems]

For this reason, the configuration of the present invention is that air cylinders are provided on the left and right sides of the feed bar, and the cam follower is brought into contact with the cam member via the link mechanism by the pressing force of the piston of the air cylinder, and the two air cylinders connected to this link mechanism are In the transfer device, the parallel feed bar is opened and closed by movement of the cam member in automatic operation, and the feed bar is opened and closed by movement of the piston in manual operation, wherein the feed bar is partitioned by the piston in the air cylinder. Air at a constant pressure is constantly supplied to the closing air chamber, thereby causing the cam follower to come into contact with the cam member during automatic operation, and the two feed bars to close during manual operation, thereby causing the air cylinder to close. 2 in manual operation by supplying air with a pressure higher than the constant pressure to the air passage connected to the air chamber for opening the feed bar defined by the piston, and supplying this high pressure air to the air chamber for opening the feed bar. The air passage is equipped with a switching valve for switching the feed bar opening/closing operation, and two valves for adjusting the opening speed and closing speed of the feed bar.
A plurality of throttle valves and a switching valve for switching between automatic operation and manual operation are provided, and air is supplied and discharged from the air chamber for opening the feed bar while supplying air at a constant pressure to the air chamber for closing the feed bar of the air cylinder. The present invention is characterized in that synchronized movement of both left and right sides of the feed bar is achieved during manual operation by moving the piston.

〔Example〕

FIG. 1 shows the air control circuit according to this embodiment,
In this FIG. 1, the mechanical drive mechanism of the feed bar is also shown schematically. This mechanical drive mechanism provided for each air cylinder on the left and right sides of the feed bar is the same as the conventional one shown in FIGS. 3 and 4. Therefore, the mechanical drive mechanism of this feed bar will be briefly explained below, and the reference numerals of the members and mechanisms used in the explanation will be those shown in FIGS. 3 and 4.
The same symbols are used for the same mechanisms.

The mechanical drive mechanism of the feed bar 3 is constituted by a link mechanism 12, and this link mechanism 12 has two
It has swing center axes 10 and 11 at the center. The link 8 at one end of the link mechanism 12 is connected to the rod 7A of the piston 7 of the air cylinder 5, and the link 16 at the other end
A cam follower 19 is provided. Arms 22 and 23 are connected to the swing center shafts 10 and 11, and the end mounting members 3 of these arms 22 and 23 are connected to the swing center shafts 10 and 11.
The feed bar 3 is attached to A.

When performing automatic operation, air is supplied to the air chamber 5A of the air cylinder 5 to move the piston 7 forward. This causes the link mechanism 12 to operate and the cam follower 19 to come into contact with the cam body 20 . When this cam body 20, which is connected to the crankshaft that moves the slide up and down, rotates, the cam follower 19 moves in accordance with the shape of the cam body 20, and thereby the link mechanism 12 operates, and the arms 22 and 23 move. The two feed bars 3 swing about shafts 10 and 11 to open and close during automatic operation.

As shown in FIG. 1, there are air control units 42, 43 on the left and right sides of the feed bar 3 corresponding to the air cylinder 5.
are provided, and these air control units 42, 4
3 constitutes an air control circuit according to this embodiment, which will be described below. These air cylinders 5, which are provided separately on the left and right sides of the feed bar 3, the feed bar mechanical drive mechanism, the air control unit 42,
43 is the bolster 1 of the press machine shown in FIG.
The control boxes 44 and 45 are installed at the left and right ends of the control box.

Since the above-mentioned left and right air control units 42 and 43 have the same structure, for convenience of understanding, the same reference numerals are used for members having the same function.

A pressure source passage 47 extending from the compressor 46, which is an air pressure source, has an air passage 48 connected to the feed bar closing air chamber 5A, which is divided by the piston 7 of the air cylinder 5, and an air passage 48, which is also divided by the piston 7 of the air cylinder 5. The air passage 49 connected to the air chamber 5B for opening the feed bar is connected in parallel. The air passage 48 is provided with a pressure regulating valve 50, a pressure gauge 50A, and a tank 51.
0, air at a constant pressure, for example, about 2.5 kg/cm ² , is supplied to the air passage 48, so the air chamber 5A for closing the feed bar of the air cylinder 5 is constantly supplied with air at this constant pressure. Air passage 49
There is a pressure regulating valve 52 and a pressure gauge 52 from the upstream side to the downstream side.
A, a 2-position 5-port switching valve 53, a throttle valve 54 with a check valve 54A, a throttle valve 55 with a check valve 55A, and a 2-position 5-port switching valve 56 are provided, and in the illustrated example, the switching valves 53 and 56 are electromagnetic It is a type switching valve. The switching valve 53 is for switching between opening and closing the feed bar, and the switching valve 56 is for switching between automatic operation and manual operation. Further, the throttle valve 54 is used to adjust the feed bar closing speed during manual operation, and the throttle valve 55 is used to adjust the feed bar opening speed during manual operation.

The pressure of the air supplied to the air passage 49 is set by the pressure regulating valve 52 to a higher pressure than the constant pressure of the air passage 48, for example, about 5 kg/cm ² . Also, 2
The switching valves 53 and 56 are connected by an air passage 57 in which throttle valves 54 and 55 are provided, and a bypass passage 58 parallel to this air passage 48.

When performing automatic operation, the switching valves 53 and 56 are set to the second
Switch to the opposite position from that shown in the figure. Air cylinder 5
Since air at a constant pressure is constantly supplied to the air chamber 5A for closing the feed bar, the piston 7 moves forward and the cam follower 19 moves to the cam body 20 as described above.
By the rotation of the cam body 20, the two feed bars 3 perform opening/closing movements for clamping and unclamping the workpiece. At this time, the air in the feed bar opening air chamber 5B that is pressed by the forward movement of the piston 7 is discharged to the atmosphere through the switching valve 56, the bypass passage 58, and the switching valve 53. Incidentally, during the automatic operation described above, the tank 51 provided in the air passage 48 absorbs the air in the air chamber 5A in which the piston 7 reciprocates as the feed bar 3 opens and closes, and also supplies the air at the constant pressure to the air chamber 5A. It has the function of supplying even when the piston 7 reciprocates.

When opening the two feed bars 3 in manual operation for mold setup work etc., the switching valve 53,
56 to the position shown in FIG. As a result, the air in the air passage 49 is transferred to the switching valve 53 and the air passage 5
7. The air is supplied to the feed bar opening air chamber 5B of the air cylinder 5 through the switching valve 56. The air pressure in the air passage 49 is the air chamber 5A for closing the feed bar.
Since the pressure is higher than the air pressure being supplied to the piston 7, the piston 7 moves backward, and as a result, the two feed bars 3 open. Feed bar 3 at this time
The opening speed is controlled by operating the throttle valve 55 to adjust the air flow rate. Also, the air pushed out from the air chamber 5A when the piston 7 retreats is transferred to the tank 5.
1 is absorbed. When the two feed bars 3 are to be closed during manual operation, the switching valve 53 is switched to a position opposite to that shown in FIG. 2, and the switching valve 56 is set to the position shown in FIG. As a result, the air chamber 5B of the air cylinder 5 communicates with the atmosphere via the switching valve 58, the air passage 57, and the switching valve 53, so that the air in the air chamber 5B is discharged and the constant amount of air that is constantly supplied to the air chamber 5A is removed. Piston 7 moves forward due to air pressure,
The two feed bars 3 move closed. The closing speed of the feed bar 3 at this time is controlled by operating the throttle valve 54 to adjust the flow rate of air discharged from the air chamber 5B.

As is clear from the above explanation, the movement of the piston 7 of the air cylinder 5 in manual operation is as follows:
The air chamber 5 for opening the feed bar is constantly supplied with air at a constant pressure to the air chamber 5A for closing the feed bar.
This is done by supplying air with a higher pressure than this constant pressure to B or by discharging air from the air chamber 5B. Therefore, the two air chambers 5 of the air cylinder 5
Only one of the air chambers A and 5B causes a pressure change, 5B, and compared to the conventional technology in which pressure changes are caused in both air chambers to move the piston forward and backward, the piston 7 is moved at a predetermined timing. It can be moved with speed etc. For this reason, air cylinders 5 provided on the left and right sides of the feed bar 3
The piston 7 can be moved by the same amount at the same time by operating the throttle valves 54 and 55, and the balanced movement of both the left and right sides of the feed bar 3 can be achieved by easily operating the throttle valves compared to the conventional technology. It can be achieved.

Further, in this embodiment, as described above, the air control units 42, 43 are incorporated in the control boxes 44, 45 at the left and right ends of the bolster 1 in FIG.
The air passage lengths from 2 to the left and right air cylinders 5 are approximately the same. Therefore, the pressure regulating valve and switching valve are integrated into one control box, and the air passage length from the pressure regulating valve to the left and right air cylinders is significantly different, unlike in the conventional technology, where the pressure is adjusted to a predetermined pressure using the pressure regulating valve. This solves the problem that when the air pressure decreases due to pipe resistance, the amount of pressure decrease differs greatly between the left and right air cylinders. In summary, in this embodiment, a pressure regulating valve 52 is provided in the air passage 49 connected to the feed bar opening air chamber 5B of the air cylinder 5, and the pressure regulating valve 52, the feed bar opening/closing switching valve 53,
A combination of air control equipment consisting of two throttle valves 54 and 55 for adjusting the feed bar opening speed and closing speed, and a switching valve 56 for automatic operation and manual operation is connected to the air cylinder 5 to control the feed bar 3. Since they are provided on the left and right sides, the pressure drop from the pressure regulating valve 52 to the left and right air cylinders 5 is small, and the amount of pressure drop can be made approximately the same for the left and right air cylinders 5.
Therefore, since the air pressures that press the pistons 7 of the left and right air cylinders 5 are the same, synchronized movement of both the left and right sides of the feed bar 3 can be achieved in this respect as well.

In the present embodiment described above, the mechanical drive mechanism of the feed bar 3 was constructed by the link mechanism 12 having two shafts 10 and 11, but this link mechanism is not limited to this, and any arbitrary type can be used. If necessary, the cam follower can be brought into contact with the cam member by the pressing force of the piston of the air cylinder, and the two feed bars can be opened and closed by the movement of the cam member during automatic operation. Further, the air control circuit of this embodiment is applied to a feed bar of a transfer device of a press machine, but the air control circuit according to the present invention is not limited to a press machine, but can also be applied to a machine that opens and closes a feed bar.
For example, it can be applied to a transfer device of a forging machine.

[Effect of idea]

According to the present invention, it is possible to easily and reliably obtain synchronized movement of the left and right sides of the feed bar during manual operation, and work such as mold setup work can be performed in a short time, thereby improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing an air control circuit and a mechanical drive mechanism of a feed bar according to an embodiment of the present invention, FIG. FIG. 4, a partially sectional side view showing details of the mechanical drive mechanism, is a view similar to FIG. 1 showing the conventional example. 3...Feed bar, 5...Air cylinder, 5
A...Air chamber for closing the feed bar, 5B...Air chamber for opening the feed bar, 7...Piston, 12...
... Link mechanism, 19 ... Roller that is a cam follower, 20 ... Cam body that is a cam member, 52 ... Pressure regulating valve, 53 ... Feed bar opening/closing switching valve, 54
... Throttle valve for adjusting feed bar closing speed, 55...
... Throttle valve for adjusting feed bar opening speed, 56...
Switching valve for automatic operation and manual operation.

Claims (1)

[Claims for Utility Model Registration] (1) The cam follower is brought into contact with the cam member via the link mechanism by the pressing force of the pistons of the air cylinders provided on the left and right sides of the feed bar, and the two In the transfer device, the parallel feed bar is opened and closed by movement of the cam member in automatic operation, and the feed bar is opened and closed by movement of the piston in manual operation, wherein the feed bar is partitioned by the piston in the air cylinder. constantly supplying air at a constant pressure to the closing air chamber, and supplying air at a higher pressure than the constant pressure to an air passage connected to the feed bar opening air chamber partitioned by the piston in the air cylinder; A transfer device characterized in that the air passage is provided with a feed bar opening/closing switching valve, two throttle valves for adjusting the opening speed and closing speed of the feed bar, and the switching valve for automatic operation and manual operation. Feed bar air control circuit. (2) In claim 1 of the utility model registration claim, the air passage is provided with a pressure regulating valve, the pressure regulating valve, the feed bar opening/closing switching valve,
A combination of air control equipment consisting of two throttle valves for adjusting the opening speed and closing speed of the feed bar, and a switching valve for automatic operation and manual operation is installed on the left and right sides of the feed bar in correspondence with the air cylinder. An air control circuit for a feed bar in a transfer device, characterized in that: