JPS624366Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a knockout device in a forging press using a transfer feeder as a master.

Unlike conventional forging presses, which operate according to the timing of the press, it is necessary to synchronize with the timing of the transfer feeder and at the same time ensure that the product is lifted for a certain period of time using a knockout pin. The present invention aims to provide a press knockout device that satisfies these requirements.

The present invention will be explained based on the drawings of one embodiment.

Bed part 2 of Feedmaster forging press 1
A plurality of knockout pins 6 for pushing up the knockout pins 5 of each of the plurality of molds 4 installed on the upper surface of the bolster 3 installed in the press and knocking out the product are guided to the bed portion 2 of the press so as to be freely raised and lowered. A lever 9 is provided which is rotatably held by a fulcrum pin 8 provided in the bed portion 3 of the press, and has a roller 7 that comes into contact with the lower end of the knockout pin 6. A roller 10 is rotatably provided at one end via a pin 11, a knock-out hydraulic cylinder 12 for abutting and urging the roller 10 is fixed to the bed portion 2, and the other end of the lever 9 The air cylinder device 13, which is connected via the plate 14 and pin 15 attached to the tip of the air cylinder rod 13a, is attached to the press bed 2 by the bracket 16 and pin 17.
They are connected and provided via.

In FIG. 5, reference numeral 18 is a three-gear type transfer unit, which is transmitted by an independent motor and a cam (not shown) and is connected to a clamp unit 20 and a lift-down unit 21 of a feed bar 19 via equalized shafts 22 and 23, respectively. It is designed to transmit power.

Next, the action will be explained.

Figure 7 shows the advance return, clamp, and unclamp of the feed bar when using a feeder with a feed stroke of 220 mm and a number of strokes per minute of 20, and a press with a press stroke of 250 mm and a number of strokes per minute of 70. A step-by-step explanation will be given based on a displacement curve that shows the relationship between strokes such as lift, down, and knockout, and the feeder angle obtained by dividing one feeder cycle into 360 degrees by a rotary cam.

The feeder is in the fixed position when the feeder angle is 310°. From this point, the feed bar first began to advance, and at a feeder angle of 60°, which was an advance of 110°, it entered a resting state, but 10° before that, at a feeder angle of 50°, the feed bar was lifted by 20 mm. The feed bar starts to go down and stops when the feeder angle reaches 85°. From that point on, the feed bar changes from the clamped state to the unclamped state, and the unclamping operation ends when the feeder angle is 140°. On the other hand, for the press, the feeder angle is 10
When the feeder angle reaches 130°, the feed bar stops and starts to return, and the press starts operating with a signal from the rotary cam limit switch of the feeder, and the feeder angle reaches 180° (at this time, the crank angle of the press also changes). In this example, when the bottom dead center reaches 180°, the solenoid valves 28 and 29 are switched by a signal from the rotary cam limit switch, and the tank 24
The pump 25 passes through the one-way valve 26, the relief valve 27, and returns to the dunk 24 through the solenoid valve 28.The oil that was being circulated is then switched to the solenoid valve 28, which activates the relief valve 27 to maintain the pressure oil at a constant pressure. The oil is supplied to the hydraulic cylinder 12 via the electromagnetic valve 29 which is switched at the same time, and when the piston rod 12a of the hydraulic cylinder 12 advances, it pushes the roller 10 attached to the lever 9, and by swinging the lever 9, it is supplied to the hydraulic cylinder 12 via the roller 7. Knockout pin 6
Start pushing up, and push up the lift amount (20mm) until the feeder angle reaches 270°. Meanwhile, when the feeder angle is 230°, the press stops at top dead center.

At a feeder angle of 235°, the feed bar finishes returning and switches to clamping operation, and at a feeder angle of 280°, the clamping operation ends and enters a rest state, and the feed bar begins to lift.

On the other hand, even if the forward movement of the piston rod 12a is stopped, the surplus of the supplied pressure oil is returned to the tank 24 through the relief valve 30, so that the 20 mm lifted state is maintained until the feeder angle reaches 290°. Then, the signal from the rotary cam limit switch activates solenoid valve 2.
8 and 29 are switched, pressure oil is removed from the hydraulic cylinder 12, and until then the air cylinder device 1
Air compressed by the piston 13b pulled up by the swinging of the lever 9 in the air chamber 3 works, swings the lever in the opposite direction, and at the same time the roller 7 is lowered, the knockout pin is also lowered, and the knockout operation is performed. finish.

The feed bar lift is completed when the feeder angle is 320°, but 10° before that, the feeder angle is
At 310 degrees, one cycle of the feeder is completed and the motion described above is repeated for the next cycle.

The present invention having the above-described structure and operation has the following advantages.

(1) Since the timing of supplying pressure oil to the hydraulic cylinder can be selected, the knockout timing can be freely adjusted and easily matched to the timing of the workpiece feeding device.

(2) The workpiece can be kept elevated for a certain period of time, which is convenient for transporting the workpiece. Also, there is no need to worry about objects that have been knocked out of the lower mold getting stuck in the lower mold.

(3) Since it can be forcibly lowered using an air cylinder, higher speeds are expected.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of one embodiment of the present invention, Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view taken along line B-B in Figure 1.
4 is a sectional view taken along the line C-C in FIG. 1, FIG. 5 is a plan view of an example of a feeder master press in which the present invention is used, and FIG. 6 is a hydraulic pressure of a hydraulic cylinder used in the present invention. System diagram, Figure 7 is a timing diagram of various operations of the feeder and press using the present invention, 1 is the forging press, 2 is the bed section, 3 is the bolster, 4 is the mold, 5 is the pin, 6 is the knockout Pin, 7 is roller, 8 is fulcrum pin, 9 is lever, 10
is a roller, 11 is a pin, 12 is a hydraulic cylinder, 13
14 is an air cylinder device, 14 is a plate, 15 is a pin, 16 is a bracket, 17 is a pin, 18 is a drive mechanism with a transfer unit, 19 is a feed bar, 20 is a clamp/unclamp mechanism, 21 is a lift/down mechanism, 22 is an equalized bar,
23 is an equalized bar, 24 is a tank, 25 is a pump, 26 is a one-way valve, 27 is a regulator, 2
8 is a solenoid valve, 29 is a solenoid valve, and 30 is a relief valve.

Claims (1)

[Scope of utility model registration request] A lever is provided in the bed of the press to guide the knockout pin so as to be freely raised and lowered, has a roller that comes into contact with the lower end surface of the knockout pin, and is rotatably held in the bed of the press by a fulcrum pin. A roller is rotatably provided at one end of the lever, a knockout hydraulic cylinder is provided for contacting and urging the roller, and an air cylinder device connected to the other end of the lever is pressed. A knock-out device for a press, characterized in that it is interposed between the bed portion of the press and the bed portion of the press.