JPS6351769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for transferring a material from a receiving position to a mold for a first processing step, and then from the first mold to a plurality of molds arranged in series in, for example, a forging press. The present invention relates to a transfer feed device used for progressive feeding toward a mold in a second processing step.

Conventionally, this type of transfer feed device is composed of a pair of feed bars each having a plurality of gripping claws on opposing sides, and a drive device that connects and supports both ends of the feed bar and moves it three-dimensionally. However, this drive device includes a drive shaft device consisting of a plurality of cams whose stroke points are shifted by a predetermined angle on a shaft driven and rotated by a press drive source or a dedicated electric motor, and a drive shaft device that is driven by the drive shaft device. It is constructed by mechanically connecting a plurality of levers, links, a transmission shaft, a cam, and a plurality of air cylinders for ensuring positive movement between the levers.

With this drive device, each operation of the feed bar (clamp and unclamp, lift and down, advance and return operations) is operated at a speed that corresponds to the shape of the cam, so shock and vibration are extremely small and the operating movement is extremely small. It is carried out smoothly, and there is no failure to grasp the material when clamping with the gripping claw attached to the feed bar, and there is no material falling when advancing.
Although it has the advantage of allowing the material to be reliably fed forward, there is a limit to high-speed operation because the levers, links, and sliding members that follow the cam must be made to be rigid and heavy in order to prevent them from vibrating. It was hot.

Furthermore, as mentioned above, the mechanical drive device has disadvantages such as an extremely complicated structure, an extremely expensive structure, and a large amount of labor and time required for maintenance.

Moreover, in addition to the mechanical drive device mentioned above, the
As shown in Publication No. 103278, a hydraulic drive device has also been attempted, but this device uses a switching valve to supply and discharge pressure oil from a hydraulic pump to a hydraulic cylinder for operating the feed bar, and each operation of the feed bar is The operation is carried out at a constant speed from the initial stage to the final stage, and since the valve opening and closing operations are performed intermittently based on the limit signal, shocks and vibrations are generated, so the feed bar operating speed is limited to a low speed, which inevitably reduces the production speed of the feeder. In order to prevent shock and vibration from occurring, it is necessary to control the opening and closing of the switching valve in an extremely short period of time, and this control is extremely difficult, and hydraulic drive devices are There were practical problems such as being complicated and expensive.

The present invention was made in order to eliminate the above-mentioned drawbacks, and the hydraulic pumps are operated individually by rotary cams corresponding to each movement of the feed bar, and the oil discharged from each hydraulic pump is used to operate each feed bar. By operating the hydraulic cylinders in sequence, the transfer feeder can be easily operated at high speed while ensuring the reliable sequential feeding of materials.In addition, by simplifying the drive device, it is possible to significantly reduce costs and facilitate maintenance. It is an object of the present invention to provide a hydraulic transfer feed device capable of quickly restarting a feeder even if a movable part does not operate a predetermined stroke due to trouble during operation of a feed bar.

Below, the example will be explained with reference to the drawings.
In the figure, reference numeral 1 denotes a set of two feed bars each having a plurality of gripping claws 2, 2, .

4 is a frame; 5 is a lift frame guided by the frame 4 so as to be able to rise and fall; the lift frame 5
A frame hole 6 is formed in which the feed bar support 3 is slidably held in a horizontal direction, that is, in a direction perpendicular to the longitudinal direction of the feed bar 1.

Reference numeral 7 denotes an advance cylinder for advancing or returning the feed bar 1, and the cylinder 7 is fixed to the lift frame 5, and its piston rod 8 is connected to a horizontal bar 9 that engages with the feed bar 1. .

10R and 10L are clamp cylinders that operate the feed bar 1 from a distance to clamp or release the material using gripping claws 2, 2... equipped on the feed bar 1, and the cylinders 10R and 10L are fixed to the lift frame 5, and The piston rod 11 is
One end of each is connected to the other end of equal-length links 12, 12 pinned to the feed bar support 3 by a pin 13.

14R and 14L are lift cylinders for raising and lowering the lift frame 5.

Next, advance cylinder 7, clamp cylinder 10R, 10L, lift cylinder 14R, 14
The hydraulic operation circuit that sequentially operates L will be described in detail.

Double action chamber 7', 10R', 10L', 1 of each cylinder
4R', 14L' and forward chambers 7'', 10R'', 10L'', 1
4R'' and 14L'' are connected to each other by a closed pipe line 16 with a pressure reducing valve 15 interposed therebetween, and the reciprocating chambers 7' and 10
A hydraulic pump line 1 is connected to the pipe line between R', 10L', 14R', 14L' and the pressure reducing valve 15 from the pressure reducing valve 15 side.
7, a solenoid valve 18, a check valve 19 and a throttle valve 20 which are branched and connected are connected and interposed in this order, and the forward movement chambers 7'', 10R'', 10L'', 14R'', 1
Hydraulic pumps 26, 27, 28, 29, and 30 driven by the respective rotary cams 21, 22, 23, 24, and 25 are interposed in the conduit between the pressure reducing valve 15 and the pressure reducing valve 15, respectively.

The rotating cams 21, 22, 23, 24, and 25 individually operate their respective hydraulic pumps in response to each operation of the feed bar (advance and return, clamp and unclamp, lift and down operations). In addition, the stroke points are arranged on the camshaft 31 so as to be shifted by a required angle.

32 indicates its driving device.

Note that the drive device 32 may be omitted when the camshaft 31 is rotated in conjunction with a press drive source or the like.

33 is a rotary switch arranged in the same manner as each rotary cam and directly connected to the camshaft 31. An ON signal from this switch operates a solenoid valve 18 corresponding to this switch so that the double-acting indoor hydraulic oil can be discharged into the tank. , at the time of the OFF signal, the pressure oil sent from the hydraulic pump 17' is transferred to the reciprocating chambers 7', 1.
0R', 10L', 14R', and 14L'.

34 is a check valve, 34' is a hydraulic oil supply circuit,
35 and 36 each indicate a relief valve.

Since the hydraulic transfer feed device of the present invention is constructed as described above, the sequential feeding operation of the feed bar is performed as follows.

First, start the electric motor 37 and start the hydraulic pump 17'.
Activate.

Pressure oil sent out from the hydraulic pump 17' passes through the solenoid valve 18 → check valve 19 and enters the reciprocating chambers 7', 10R', 10L', 14R', 1 of the cylinder.
4L' and causes each cylinder to perform contraction operation.

In this state, the forward movement chambers 7'' and 10 of the cylinder are
The hydraulic oil in R'', 10L'', 14R'', 14L'' is pushed back into the cylinder of the hydraulic pump 26, 27, 28, 29, 30, and the piston rod ends 26', 27', 28', 29' and 30' are pressed against the curved peripheral surfaces of the cams 21, 22, 23, 24, and 25.

After the above preparation operations, the cams 21, 22, 23,
When 24 and 25 are rotated by a drive device 32 that rotates in synchronization with the press drive source, first, the hydraulic pump 26 starts operating along the curved circumferential surface of the cam 21, and at the same time, the rotary switch 33 is operated, and its output signal activates the solenoid. Valve 18 is switched.

Therefore, the hydraulic oil in the hydraulic pump 26 becomes high-pressure oil and is sent to the forward movement chamber 7'' of the advance cylinder 7.
From the point at which the internal pressure overcomes the internal pressure of the reciprocating chamber 7', acceleration and deceleration are successively applied at a speed corresponding to the shape of the cam 21 to perform a stroke operation and advance the feed bar 1.

At this time, the pressure oil in the reciprocating chamber 7' flows through the throttle valve 20→
Although it is discharged into the tank through the solenoid valve 18, the braking action by the throttle valve 20 maintains the inside of the reciprocating chamber at a predetermined pressure, thereby preventing overstroke due to inertia of moving parts such as the feed bar 1.

Furthermore, when the cam 21 rotates and maintains its stroke state for a predetermined period of time, it moves to a region where the cam radius decreases, and at the same time, the solenoid valve 18 is restored by turning off the rotary switch 33, so that the oil is sent from the hydraulic pump 17'. The pressurized oil acting on the backward motion chamber 7' causes the hydraulic fluid in the forward motion chamber to return to the hydraulic pump 26, reducing the advance cylinder to its original state.
Acceleration and deceleration are continuously applied at a speed corresponding to the shape of 6, and a return operation is performed. Next, regarding the clamp cylinders 10R, 10L and the lift cylinders 14R, 14L, the cam 21
cams 24, 25, whose operation timings are sequentially delayed.
Hydraulic pumps 29, 30, 2 are activated by rotation of 22, 23 and actuation of solenoid valve 18 by a signal from rotary switch 33 directly connected to camshaft 31.
7 and 28 start strokes in sequence, and in response, the clamp cylinders 10R, 10L and lift cylinders 14R, 14L operate in the same manner as the advance cylinder 7, clamping and unclamping the feed bar 1 with respect to the feed bar, respectively. Operation, raising and lowering feed bar 1, feed bar 1
Advance return operations are added in a superimposed manner.

Therefore, the feed bar 1 is clamp → lift →
It is operated three-dimensionally in the order of advance → down → unclamp → return, and the feed bar mounting claw sequentially feeds the material in the trajectory shown in FIG. 6.

In addition, when each cylinder does not operate at the prescribed stroke due to trouble on the moving part side, the forward movement chambers 7'', 10R'', 10L'', 14R'', 14L'' of each cylinder and the hydraulic pumps 26, 27, 28, 29, 30 becomes abnormally high pressure, but this is relieved by the relief valve 36, and the shortage of oil due to troubleshooting is caused by part of the pressure oil being sent out from the hydraulic pump 17' during the return process of the hydraulic pump. The hydraulic oil is replenished under reduced pressure from the hydraulic oil replenishment circuit 34' via the pressure reducing valve 15.

As described above, in the present invention, a hydraulic cylinder that reciprocates the feed bar in its longitudinal direction and a hydraulic cylinder that moves the feed bar up and down are installed at both ends of a pair of feed bars each having a plurality of gripping claws on opposing sides. A hydraulic pump that has hydraulic cylinders that move both feed bars toward and away from each other, is directly connected to piping to the forward movement chamber of each hydraulic cylinder, and is individually operated by rotary cams that correspond to each movement of the feed bar. A mechanism for supplying and maintaining a predetermined pressure of reciprocating oil to the reciprocating chamber, which is equipped with a hydraulic oil replenishment circuit that replenishes insufficient hydraulic oil in the reciprocating chamber, and a relief circuit that relieves the reciprocating oil when the pressure exceeds a certain pressure. The rotating cams have staggered stroke points for clamp, lift, advance,
Since the down, unclamp, and return steps are sequentially driven, the speed control of the hydraulic cylinder to operate the feed bar with extremely low impact and vibration is achieved reliably and extremely easily and inexpensively. In addition, the weight of the moving parts can be reduced, which makes it easy to operate at high speed.Also, the feedbar drive device can be greatly simplified compared to conventional ones, and maintenance is extremely easy, making it easier to maintain the transfer. The feed device is extremely inexpensive, and even if the moving part does not perform the prescribed stroke due to trouble when moving the hydraulic cylinder for feed bar operation forward, it will not cause pipe damage and will not cause damage in that case. Even if there is a shortage of hydraulic oil in the hydraulic pump due to oil leakage from the relief or hydraulic cylinder seal, the insufficient amount of oil can be automatically replenished by the low-pressure oil replenishment circuit, so the hydraulic cylinder will not need any stroke. The feeder can be quickly restarted without any fluctuations, and the effect is enormous.

[Brief explanation of the drawing]

Fig. 1 is a plan sectional view showing the arrangement of a hydraulic transfer feed device, a forging press frame, and a die row according to the present invention, Fig. 2 is a side sectional view taken along the line in Fig. 1, and Fig. 3 is a hydraulic FIG. 4 is an explanatory diagram showing the pump and its drive system, FIG. 4 is a hydraulic operation circuit diagram, and FIG. 5 is a diagram showing the trajectory of the feed bar and gripping claw. 1, 1...Feed bar, 2, 2...Gripping claw, 7...
Advance cylinder, 7'...Return chamber, 7''...Forward motion chamber, 10R, 10L...Clamp cylinder, 10
R′...Returning chamber, 10R''...Forward moving chamber, 14R, 14L
...Lift cylinder, 14R'...Returning chamber, 14R''...
Forward movement chamber, 26, 27, 28, 29, 30... Hydraulic pump, 21, 22, 23, 24, 25... Rotating cam, 34'... Hydraulic oil supply circuit, 36... Relief valve.

Claims (1)

[Claims] 1 A hydraulic cylinder that moves the feed bar reciprocally in its longitudinal direction, a hydraulic cylinder that moves the feed bar up and down, and a hydraulic cylinder that moves both feed bars toward and away from each other are attached to both ends of a pair of feed bars each having a plurality of gripping claws on opposing sides. It has a hydraulic cylinder that moves, and the reciprocating chambers 7″, 10R″ of each hydraulic cylinder,
10L'', 14R'', and 14L'' are directly connected to piping and operated individually by rotary cams corresponding to each feed bar operation, and a hydraulic pump that replenishes the insufficient hydraulic oil in the reciprocating chamber. circuit and a relief circuit for relieving forward motion oil at a pressure above a certain pressure, and double motion chambers 7', 10R', 10
L', 14R', and 14L' are equipped with a mechanism that supplies and maintains reciprocating oil at a predetermined pressure, and the stroke points of each rotating cam are shifted in the order of clamp, lift, advance, down, unclamp, and return. A hydraulic transfer feed device characterized by being driven in series.