JPS6358655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for transporting a material from a receiving position to a mold for a first processing step, and then to a mold for a first processing step, with respect 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 progressively feeding a mold from a mold to a mold for 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, and transmission shafts, a cam, and a plurality of air cylinders that ensure 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 being able to reliably feed the material sequentially, there is a natural limit to high-speed operation because the levers, links, and sliding members that follow the cam cause vibrations, making them highly rigid and heavy components. .

Further, as mentioned above, the mechanical drive device has a very complicated structure, is very expensive, and has drawbacks such as a large amount of maintenance and maintenance, which requires a lot of labor and time.

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 within 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 cam pumps are operated individually by rotary cams corresponding to each operation, and the oil discharged from each hydraulic cam pump is used to drive each hydraulic cylinder for feed bar operation. The hydraulic transfer feeder operates in sequence, allowing the transfer feeder to operate easily and at high speed while ensuring the reliable sequential feeding of materials.The hydraulic transfer feeder also allows for significant cost reductions and easier maintenance by simplifying the drive device. The aim is to provide an afeed device.

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. This cylinder 7 is fixed to the lift frame 5, and its piston rod 8
is connected to a horizontal bar 9 which is fitted into 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, 14L
The hydraulic operation circuit that sequentially operates the following will be described in detail.

Double action chamber 7', 10R', 10L', 1 of each cylinder
4R', 14L' and forwarding 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 cam pumps 26, 27, 28, 29, and 30 driven by the respective rotating cams 21, 22, 23, 24, and 25 are interposed in the pipeline 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 cam 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.
It is made to feed to 0R', 10L', 14R', and 14L'.

34 is a check valve, and 35 and 36 are relief valves.

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 from the hydraulic pump 17' passes through the solenoid valve 18 → check valve 19 and enters the double-acting 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 cam pump 26, 27, 28, 29, 30, and the piston rod ends 26', 27', 28', 29', 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,
24 and 25 are rotated by a drive device 32 that rotates in synchronization with the press drive source, first, the hydraulic cam pump 2
6 starts operating along the curved peripheral surface of the cam 21, and at the same time, the rotary switch 33 is operated, and the solenoid valve 18 is switched by the output signal thereof.

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

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 pressure inside the reciprocating chamber is maintained at a predetermined level by the control action of the throttle valve 20, and overstroke due to the inertia of the moving parts such as the feed bar 1 is prevented.

Further, when the cam 21 rotates and maintains the stroke state for a predetermined period of time and moves to a region where the cam radius decreases, the solenoid valve 18 is restored by turning off the rotary switch 33 at the same time, so that the oil is sent from the hydraulic pump 17'. The pressurized oil acting on the backward motion chamber 7' acts on the forward motion chamber 7', and the forward motion chamber hydraulic fluid returns to the hydraulic cam pump 26, reducing the advance cylinder to its original state. This causes the feed bar 1 to move at a speed corresponding to the shape of the cam 21. Acceleration and deceleration are applied continuously and the return operation is performed.

Next, regarding the clamp cylinders 10R, 10L and the lift cylinders 14R, 14L, cams 24, 2 whose operation timings are sequentially delayed together with the cam 21 are as follows.
Hydraulic cam pumps 29, 3 are activated by rotation of 5, 22, 23 and actuation of solenoid valve 18 by a signal from rotary switch 33 directly connected to camshaft 31.
0, 27, 28 start strokes in sequence Clamp cylinders 10R, 10L, lift cylinder 14
R and 14L operate in the same manner as in the case of the advance cylinder 7, and the clamp/unclamp operation of the feed bar 1, the raising/lowering operation of the feed bar 1, and the advance/return operation of the feed bar 1 are superimposed on the feed bar, respectively.

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.

If the hydraulic fluid in the hydraulic cam pump becomes insufficient due to leakage or the like, the pressure fluid delivered from the hydraulic pump 17' is reduced in pressure and replenished via the pressure reducing valve 15 during the return process of the hydraulic cam pump.

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. It is equipped with hydraulic cylinders that move both feed bars toward and away from each other, and is equipped with a hydraulic cam pump that is directly connected to piping to the forward movement chamber of each hydraulic cylinder and that is operated and operated individually by rotating cams that correspond to each operation. , the reciprocating chamber is equipped with a mechanism for supplying and maintaining reciprocating oil at a predetermined pressure, and each of the rotary cams has a stroke point shifted by a predetermined angle, and the strokes are sequentially executed in the order of clamp, lift, advance, down, unclamp, and return. Since the feed bar is driven by a hydraulic cylinder, the speed control in the hydraulic cylinder to minimize shock and vibration can be achieved reliably, extremely easily and inexpensively, and the weight of the moving parts can also be reduced. These factors combine to make it easy to operate at high speed, and the feed bar drive device is much simpler than conventional ones, making maintenance extremely easy, making the transfer feed device extremely inexpensive. The effect is enormous.

[Brief explanation of the drawing]

Figure 1 is a plan sectional view showing the arrangement of a hydraulic transfer feed device, a casting press frame, and a die row according to the present invention, Figure 2 is a side sectional view taken along the line in Figure 1, and Figure 3 is a hydraulic FIG. 4 is an explanatory diagram showing the cam 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 the gripping claw. 1, 1... Feed bar, 2, 2... Gripping claw,
7...Advance cylinder, 7'...Return chamber,
7″...Forward movement chamber, 10R, 10L...Clamp cylinder, 10R'...Return movement chamber, 10R''...Forward movement chamber,
14R, 14L...Lift cylinder, 14R'...
...Return chamber, 14R'...Forward movement chamber, 26, 27, 2
8,29,30...Hydraulic cam pump, 21,2
2, 23, 24, 25...Rotating cam.

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. The feed bar is equipped with a hydraulic cam pump which is directly connected to piping to the forward movement chamber of each hydraulic cylinder and is operated individually by a rotary cam corresponding to each movement of the feed bar, and a hydraulic cam pump is provided in the return movement chamber. is equipped with a mechanism for supplying and maintaining reciprocating oil at a predetermined pressure, and each of the rotary cams is clamped by shifting the stroke point by a predetermined angle.
A hydraulic transfer feed device that is driven in the order of lift, advance, down, unclamp, and return.