JPH03265Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) In this invention, a knock-out lever for knocking out an upper knock-out pin is arranged at a predetermined position of a slide in a forging press. The invention relates to a knock-out device in which the knock-out lever is interlocked in the knock-out direction by an actuating member that is operated by the knock-out lever.

(Prior art) Conventionally, this type of knock-out device
As shown in the figure, when the upper die of the slide 7 is at the bottom dead center, there is a predetermined gap S between the actuating member 18 protruding from the outer surface of the connecting rod 6 and the knockout lever 14. is set. That is, it is possible to prevent the reaction force of the forging press from acting on the upper knockout pin 13, the knockout levers 15, 14, and the operating member 18 and damage these members, or to prevent the assembly of each member. As described above, a predetermined gap S is set between the actuating member 18 and the knockout lever 14 in consideration of the performance and the like.

(Problem to be Solved by the Invention) However, if a predetermined gap S is set between the actuating member 18 and the knockout lever 14, immediately after the upper mold of the slide 7 descends to the bottom dead center and rises, The knockout operation of the upper knockout pin 13 is delayed by an amount corresponding to the gap S. This delay in the knock-out operation causes problems such as cracks, cracks, bends, etc. in the forged product.

Furthermore, there is a knockout device disclosed in Japanese Utility Model Application Publication No. 58-157242. However, in this case, the entire stroke of the knockout operation of the knockout pin is performed by the cylinder, so the cylinder becomes large.

Furthermore, since the cylinder is linked via a cam, a lever, a cylinder separate from the cylinder, and piping, the structure becomes complicated, and at the same time as the slide at the bottom dead center rises, the knockout occurs. It becomes difficult to operate the cylinder for knockout of the knockout pin. Therefore, the knockout operation of the knockout pin may be delayed.

(Means for solving the problem) Therefore, in this invention, a knock-out lever for knocking out the upper knock-out pin is disposed at a predetermined position of the slide in the forging press, and is activated as the slide rises. The knock-out device is of a type in which the knock-out lever is moved in the knock-out direction by an operating member, and the knock-out lever has a mechanism for pushing the knock-out lever in the knock-out direction to knock out the upper knock-out pin. A knock-out cylinder is provided that projects a predetermined length in a direction, and the rod of the knock-out cylinder is always in contact with the knock-out lever. The structure is such that an accumulator is provided to store hydraulic pressure for knocking out the upper knockout pin at the same time as the upper knockout pin is raised from the ground.

(Function) According to the above structure, during a forging press in which the slide descends to the bottom dead center, the upper knockout pin is moved back from a predetermined position by this pressure. As the knockout pin moves back, the rod of the hydraulic cylinder is pushed back via the knockout lever, so that hydraulic pressure for knocking out the upper knockout pin is stored in the accumulator. Thereafter, at the same time as the slide at the bottom dead center rises, the knock-out cylinder is actuated by the hydraulic pressure stored in the ammulator, and the upper knock-out pin is operated to knock out via the knock-out lever.

(Embodiment) An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, which shows the main parts of a forging press in longitudinal section, a lower die 3 and a lower punch 4 are respectively disposed on the upper surface of the lower bolster 2 of the press bed 1. Knock-out operation is performed upwardly by the knock-out pin 5.

An upper die holder 9, an upper die punch 10, and a core 11 are provided on the lower surface of the upper bolster 8 of the slide 7, which is moved up and down via the connecting rod 6 by the rotation of a crankshaft (not shown). The upper die punch 10 is disposed in the upper die holder 9.
Compressed air is supplied from the air piping 12 to urge the cylinder upward.

An upper knockout pin 13 in the vertical direction that knocks out the upper die punch 10 against the biasing force of compressed air is disposed so as to penetrate through the bottom plate portion 7a of the slide 7 and the upper bolster 8 so as to be able to perform the knockout operation. . At a predetermined position on the slide 7, there are a pair of upper and lower knockout levers 14 and 15.
are rotatably supported around separate pins 16 and 17, respectively.

The knockout lever 14 shown in FIG. 1 has one end facing an actuating member 18 protruding from the side surface of the connecting rod 6 so as to be able to approach and separate from it with a predetermined gap S therebetween. The other end of the knockout lever 14 is connected to the second knockout lever 1.
5, and is constantly in contact with one end of 5. And the second
The lower surface of the other end of the knockout lever 15 is in constant contact with the upper end surface of the upper knockout pin 13.

Now, on the outer surface of the other end of the first knock-out lever 14, there is a knock-out cylinder (for pushing the first knock-out lever 14 in the clockwise knock-out direction in FIG. 1 about the pin 16). A hydraulic cylinder (hydraulic cylinder) 19 is fixedly disposed at a predetermined position on the slide 7. In this knockout cylinder 19, the distal end surface of the rod 20 is always in contact with the outer surface of the other end of the first knockout lever 14, and when the rod 20 is pushed out, the first and second knockout cylinders The upper knockout pin 13 is set to protrude by a predetermined length in the knockout direction via both knockout levers 14 and 15, as shown by the chain line in FIG.

An accumulator 21 is disposed in the hydraulic circuit of the knockout cylinder 19 to store hydraulic pressure for knocking out the upper knockout pin 13 at the same time as the slide 7 rises from the bottom dead center. That is, as shown in FIG. 1, the knock-out cylinder 19 and the accumulator 21 are communicated with each other through a conduit 22, and an electromagnetic three-position directional control valve 23 is connected to the conduit 22. Check valve 2
4. A hydraulic line 25 leading to a hydraulic unit 27 including a motor M, a pump P and a tank T is connected. Note that a relief valve 26 is provided in the hydraulic conduit 25.

The three-position directional switching valve 23 is operated to be switched to three positions, pressurizing position A, blocking position B, and pressure releasing position C, via a switch or the like as the slide 7 moves upward. When it is at the top dead center or at the beginning of descent, it is switched to the pressurizing position A, and thereafter, when the pressure in the pipe line 22 reaches the set pressure, it is switched to the blocking position B. moreover,
While the slide 7 descends to the bottom dead center and then rises by a predetermined amount, that is, while the upper knockout pin 13 performs the initial knockout operation, it is held at the block position B. Thereafter, the slide 7 is further raised, and after the actuating member 18 of the connecting rod 6 comes into contact with the first knockout lever 14, it is set to be switched to the pressure release position C.

This embodiment is constructed as described above, and therefore, while the slide 7 descends by a predetermined amount from the top dead center, the three-position directional control valve 2
3 is switched to the pressurizing position A, and the pipe line 22 is pressurized to the set pressure. Then, knockout cylinder 1
9 is pushed out, and the upper knockout pin 13 is projected by a predetermined length in the knockout direction via both the first and second knockout levers 14 and 15. Thereafter, the three-position directional control valve 23 is switched to the blocking position B, and the line 22 is blocked.

Thereafter, the slide 7 descends to the bottom dead center as shown in FIG. 1, and the workpiece W between the lower die punch 4 and the upper die punch 10 is forged and pressed. That is, while the three-position directional control valve 23 is switched to the block position B and the slide 7 is lowered to the bottom dead center, the protrusion amount h of the knockout pin 13 is
The die face 10a of the upper die punch 10, which has been pushed down by the amount h, comes into contact with the workpiece W. When the slide 7 continues to descend, the upper die punch 10 comes into contact with the workpiece W and does not move further down, so that only the slide 7 and the upper die holder 9 are pushed down by the amount h of the upper die punch 10 (i.e. The upper punch 10 is relatively lowered until the upper surface of the upper die punch 10 contacts the upper bolster 8). At this time,
The knockout pin 13 tries to descend together with the slide 7, but the above-mentioned upper die punch 1 which is stopped
Since the slide 7 cannot be lowered due to the lower end thereof being in contact with the upper surface of the upper die punch 10, the slide 7 is pushed back upwards with its lower end surface relatively in contact with the upper surface of the upper die punch 10. Then, the rod 20 of the knockout cylinder 19 is pushed back via both the first and second knockout levers 14 and 15. By pushing back the rod 20, the hydraulic pressure inside the accumulator 21 is increased. Then, when descending further, the upper die punch 10
is also lowered at the same time, and the workpiece W is forged and pressed.

When the slide 7 at the bottom dead center rises, the hydraulic pressure stored in the accumulator 21 causes the rod 20 of the knockout cylinder 19 to move upward, as shown in FIG.
is pushed out, and the upper knockout pin 13 is operated to be knocked out via both the first and second knockout levers 14 and 15.

As the connecting rod 6 swings as the slide 7 rises, the actuating member 18 of the connecting rod 6 is moved to the first knockout lever 1.
4, by this actuating member 18,
The upper knockout pin 13 is knocked out to the knockout completion position via the first and second knockout levers 14 and 15, and the core 11 is removed from the workpiece W.

Upper knockout pin 1 by the operating member 18
When the knock-out operation No. 3 is performed, the three-position directional control valve 23 is switched to the pressure release position, and the pipe line 22
The hydraulic pressure inside is removed. When the slide 7 reaches the top dead center, the upper die punch 10 is raised by the pressure of the compressed air in the upper die holder 9, and the lower end of the core 11 is moved a predetermined distance from the lower surface of the upper die punch 10. The length is ejected, and one cycle of the forging press is completed. Note that mold lubricant is applied to the protruding portion of the core 11 at the top dead center of the slide 7.

(Effects of the invention) As described above, according to this invention, during the forging press in which the slide descends to the bottom dead center, the upper knockout pin is retracted to a predetermined position by this pressure. As the knockout pin moves back, the rod of the hydraulic cylinder is pushed back via the knockout lever, so that hydraulic pressure for knocking out the upper knockout pin is stored in the accumulator. After that, when the slide at the bottom dead center rises, at the same time as this rise starts, the knockout cylinder is operated by the hydraulic pressure stored in the accumulator, and the upper knockout pin is knocked out via the knockout lever. I can do it. Therefore, it is possible to eliminate the problem of the knockout operation of the upper knockout pin being delayed due to the gap between the operating member and the knockout lever, which may cause cracks, cracks, bends, etc. in the forged parts. This has the effect of reliably preventing this from happening.

Moreover, since the knock-out cylinder is provided to the knock-out lever, the structure is simple, and the knock-out cylinder can be connected to the knock-out lever while leaving the conventional knock-out device shown in Fig. 3 in almost the same state. By arranging it, there are also effects such as making it possible to remodel.

[Brief explanation of drawings]

Figures 1 and 2 of the drawings show one embodiment of this invention. Figure 1 is a vertical cross-sectional view showing the slide lowered to the bottom dead center, and Figure 2 is a longitudinal sectional view showing the slide at the bottom dead center. FIG. 3 is a vertical cross-sectional view showing a state in which the height has risen by a predetermined amount. FIG. 3 is a longitudinal cross-sectional view of a conventional device. 6...Connecting rod, 7...Slide, 10...Upper die punch, 11...Core, 13...
...Upper knockout pin, 14...First knockout lever, 15...Second knockout lever, 18...Operating member, 19...Knockout cylinder, 20...Rod, 21...Accumulator, 23 ...Three-position directional valve.

Claims (1)

[Scope of utility model registration request] A knock-out lever for knocking out the upper knock-out pin is arranged at a predetermined position on the slide of the forging press, and the knock-out lever is interlocked in the knock-out direction by an operating member that is activated as the slide rises. In the knockout device, the knockout lever is provided with a knockout cylinder that pushes the knockout lever in the knockout direction and projects the knockout pin by a predetermined length in the knockout direction. , the rod of this knockout cylinder is kept in constant contact with the knockout lever, and the hydraulic circuit of the knockout cylinder is supplied with hydraulic pressure for knocking out the upper knockout pin at the same time as the slide rises from the bottom dead center. A knock-out device for a forging press, which is characterized by being equipped with an accumulator that stores.