JP2006218533A - Knockout apparatus in forging press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate maintenance of the vicinity of a knockout pin and a knockout lever. <P>SOLUTION: A knockout apparatus is provided with: a mechanical driving mechanism A for ascending the knockout pin 7 through the knockout lever 6; and a hydraulic driving mechanism B for ascending the knockout pin 7 with hydraulic pressure, and the knockout pin 7 is divided into an upper knockout pin 7a and a lower knockout pin 7b and they are arranged on the same axis and the lower knockout pin 7b is engaged with the knockout lever 6. The hydraulic driving mechanism B is provided with an oscillating arm 13 and a hydraulic cylinder 14 for pressing one end part of the oscillating arm 13, and the other end part 13b of the oscillating arm is engaged with an engaging surface 17b formed in the upper knockout pin 7a. Since it is enough for the hydraulic driving mechanism B to move the upper knockout pin 7a, the hydraulic cylinder 14 can be made small and further, since the hydraulic cylinder 14 can be arranged away from the knockout pin 7 etc., the cylinder 14 does not impair the maintainability of the apparatus. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a knockout device used when a work of a forging press is removed from a mold.

  In a conventional knockout device, for example, as shown in Patent Document 1, a knockout lever is provided on a fixed frame so as to be swingable in a vertical direction, and a mechanical drive mechanism and a hydraulic drive mechanism (hydraulic cylinder) are connected to the knockout lever. Has been. A knockout pin in the vertical direction is attached to one end of the knockout lever. As the knockout lever swings, the knockout pin moves up and down to push up (push up) the workpiece fitted in the mold at the upper end. It has become.

  When removing the workpiece from the mold, first, the knockout lever is operated by the mechanical drive mechanism, the molded product is pushed up by the knockout pin, the workpiece is separated from the mold (primary knockout), and then the knockout lever is driven by the hydraulic drive mechanism. Is operated to further raise the knockout pin to push up the workpiece by a predetermined stroke (secondary knockout). Thus, by using the mechanical drive mechanism for the primary knockout, it is possible to cope with the large peeling force required when removing the workpiece from the mold, and by using the hydraulic drive mechanism for the secondary knockout, Soft knockout prevents the workpiece from jumping out of the mold.

In the knockout device described in Patent Document 2, a mechanical drive mechanism that swings the knockout lever is connected to the knockout lever (arm), and a pneumatic drive mechanism (air cylinder) is provided between the knockout lever and the knockout pin. ). According to this configuration, the knockout pin can raise the molded product by a height corresponding to the stroke by the piston rod of the air cylinder in addition to the lift stroke by the mechanical drive mechanism. can do. The total stroke can be easily adjusted by adjusting the amount of expansion and contraction of the piston rod.
Japanese Utility Model Publication No. 64-42737 Japanese Utility Model Publication No. 58-51842

  However, in the knockout device described in Patent Document 1, the hydraulic cylinder used for the secondary knockout operates the knockout lever. Since the knockout lever is heavy, a large cylinder is required to operate it. If a large cylinder is interposed around the knockout lever, the cylinder or the like becomes an obstacle to the maintenance of the apparatus such as replacement of parts around the knockout lever. For this reason, the knockout device described in Patent Document 1 is not preferable because maintenance is complicated.

Moreover, since the air cylinder is attached between the knockout lever and the knockout pin in the knockout device described in Patent Literature 2, the cylinder does not directly operate the knockout lever as in Patent Literature 1. . However, if the air cylinder is interposed between the knockout lever and the knockout pin, the cylinder becomes an obstacle to the maintenance of the apparatus such as replacement of the knockout pin parts. For this reason, the knockout device described in Patent Document 2 is not preferable because maintenance is complicated.
In particular, when a workpiece is knocked out from a plurality of dies in parallel, the interval between adjacent knockout pins is often narrow. Therefore, if a cylinder is interposed in the narrow space, the work is further complicated.

  Therefore, an object of the present invention is to facilitate maintenance around the knockout pin and the knockout lever.

  In order to solve the above-mentioned problems, the present invention is such that an arm that swings by a hydraulic drive mechanism is engaged with a knockout pin, and the knockout pin is raised by the hydraulic drive mechanism via the arm. is there. In this way, the cylinder of the hydraulic drive mechanism does not directly operate the knockout lever, so that the cylinder can be made smaller. Further, since the cylinder of the hydraulic drive mechanism can be provided at a position away from the knockout lever and the knockout pin, the cylinder does not obstruct work during maintenance such as replacement of parts of the knockout lever and the knockout pin. For this reason, maintenance around the knockout pin and the knockout lever can be facilitated.

  Since the present invention is configured as described above, maintenance around the knockout pin and the knockout lever is facilitated.

  As a specific embodiment of the above means, a knockout pin that can be raised and lowered to push up a work of a forging press, and a mechanical drive mechanism that raises the knockout pin via a knockout lever that swings in conjunction with a slide drive shaft of the forging press; A knockout device of a forging press having a hydraulic drive mechanism for raising the knockout pin, wherein the hydraulic drive mechanism comprises a swing arm and a hydraulic cylinder that presses one end of the swing arm, and the knockout pin is An engaging portion that engages with the other end of the swing arm is provided above the lower end, the knockout pin is raised by the mechanical drive mechanism, and the knockout pin is raised by the hydraulic drive mechanism. It is.

In this way, the hydraulic drive mechanism only needs to raise the knockout pin and does not operate the knockout lever, so a small hydraulic cylinder is sufficient. Small cylinders do not require a large space for installation and are less likely to interfere with work. Therefore, according to the above configuration, maintenance around the knockout pin and the knockout lever can be facilitated.
Further, since the hydraulic cylinder is provided at one end of the swing arm, that is, at a position away from the knockout lever and the knockout pin, the cylinder is unlikely to be an obstacle to work when maintaining the knockout lever and the knockout pin or replacing parts. For this reason, maintenance around the knockout pin and the knockout lever can be facilitated.

  In the above configuration, the knockout pin is divided into an upper knockout pin and a lower knockout pin whose lower end engages with the knockout lever, and the lower end of the upper knockout pin engages with the other end of the swing arm. A configuration in which a part is formed may be employed.

  In this way, the hydraulic drive mechanism only needs to raise the upper knockout pin, so that the hydraulic cylinder can be made even smaller. For this reason, the obstacle to the said operation | work by a cylinder interposing can further be reduced, and maintenance can be made still easier.

  One embodiment will be described with reference to FIGS. As shown in FIG. 1, a knockout pin 7 that can be raised and lowered to push up a workpiece W in a die 10 of a forging press is provided so as to be movable up and down through a die holder 9 and a bolster 8 that support the die 10. The knockout pin 7 is raised by the operation of the mechanical drive mechanism A.

As shown in FIG. 1, the mechanical drive mechanism A has a cam 1 driven in synchronism with a slide drive shaft (not shown) of a forging press, and a roller 2 engaged with the outer periphery thereof, and has one end. The upper lever 3 is pivotally supported, and a vertical connecting rod 4 is rotatably connected to the other end of the upper lever 3 via a pin.
Further, the mechanical drive mechanism A includes a swing shaft 6a disposed horizontally below the bolster 8 and a lower lever 5 supported at one end thereof so as to swing in the vertical direction (see FIG. 2). The tip of the lower lever 5 and the connecting rod 4 are rotatably connected via a pin (see FIG. 3). Further, the swing shaft 6a is provided with a knockout lever (timing lever) 6 that swings integrally with the lower lever 5 from the middle in the axial direction toward the other end. The lower end of each knockout pin 7 is supported (see FIG. 4).
Note that, as an example of the knockout lever 6, the contents thereof are described in “Japanese Unexamined Patent Application Publication No. 2002-102992.”

  As shown in FIGS. 1 and 3, the connecting rod 4 and the lower lever 5 are connected to each other via a hydraulic cylinder 11 for preventing overload. The lower lever 5 is moved downward. An urging air cylinder 12 is attached. When the hydraulic pressure exceeds the upper limit value, the hydraulic cylinder 11 functions so that the relief valve is actuated to release the hydraulic pressure in the cylinder so that the mechanical driving force from the slide drive shaft is not transmitted to the lower lever 5. . The air cylinder 12 functions to maintain the state in which the roller 2 is in contact with the cam 1 by urging the lower lever 5 downward.

The knockout pin 7 is divided into an upper knockout pin 7a and a lower knockout pin 7b whose lower end engages with the knockout lever 6. The upper knockout pin 7a and the lower knockout pin 7b are divided into guides 18 shown in FIG. , 18 respectively.
As shown in FIG. 1, the upper knockout pin 7a is inserted into a hole 19 penetrating the die 10, die holder 9 and bolster 8 of the forging press in the vertical direction. The upper knockout pin 7a is divided into an upper upper end member 24 and a lower main body member 25 (see FIG. 5). When the upper end member 24 is worn due to repeated knockout, only the upper end member 24 is present. Can be replaced easily.
The upper knockout pin 7a is notched on both sides slightly upward from the lower end surface 17a thereof, and the downwardly upper surface of the pair of notches forms an engagement surface (engagement portion) 17b.

  The engaging surface 17b is engaged with the other end 13b of a swing arm 13 provided on a fixed frame (not shown) via a swing shaft 13a so as to be swingable in the vertical direction. As shown in FIG. 6, the other end 13b of the swing arm 13 is bifurcated, and a bifurcated liner 23 is attached to the bifurcated portion. The lower portion of the upper knockout pin 7a is loosely fitted to the forked portion of the other end 13b, and the arcuate upper surface 23a of the liner 23 abuts on the engagement surface 17b of the upper knockout pin 7a.

Further, as shown in FIG. 1, a hydraulic cylinder 14 fixed to the frame is provided at one end of the swing arm 13, and a rod 14 a of the hydraulic cylinder 14 moves one end of the swing arm 13 downward. It is designed to press toward you. When the rod 14a of the hydraulic cylinder 14 presses one end of the swing arm 13 downward, the swing arm 13 swings, and by the swing, the swing arm 13 is connected to the upper surface 23a and the engagement arm 13a. Only the upper knockout pin 7a is raised through the mating surface 17b.
An air cylinder 15 is provided adjacent to the hydraulic cylinder 14, and similarly, a rod 15a of the air cylinder 15 presses one end of the swing arm 13 downward (FIG. 5).

  The operation of this knockout device will be described with reference to FIG. 7. When the workpiece W is pressed in the mold 10, first, the primary knockout of the workpiece W by the mechanical drive mechanism A is performed.

  In the state shown in FIG. 7A, the primary knockout is performed by the mechanical drive mechanism A operated by the mechanical power of the forging press ascending the lower knockout pin 7b of the knockout pin 7 as shown by the arrow in FIG. 7B. Let As the lower knockout pin 7b rises, the upper knockout pin 7a also rises and pushes up the workpiece W in the mold 10 to knock it out. At this time, as shown in FIG. 7 (b), the rod 16 a of another air cylinder 16 fixed to a slide (not shown) extends above the mold 10, and the tip of the rod 16 a is the upper surface of the workpiece W. The workpiece W is prevented from popping out by abutting against.

  Next, secondary knockout of the workpiece W by the hydraulic drive mechanism B is performed.

In the state after the completion of the primary knockout, as shown in FIG. 7C, the hydraulic cylinder 14 is operated, the rod 14a is extended downward, the swing arm 13 is swung, and the other end 13b is lifted. Let Due to the rise of the other end 13b, the upper surface 23a of the liner 23 comes into contact with the engagement surface 17b of the upper knockout pin 7a, and then the other end 13b further rises to push up the upper knockout pin 7a. Knock out. Note that the air cylinder 15 is also operated together with the hydraulic cylinder 14.
At this time, since the swing arm 13 raises only the upper knockout pin 7a and does not operate the lower knockout pin 7b, the knockout lever 6, the swing shaft 6a, and the lower lever 5, the hydraulic cylinder 14 moves the upper knockout pin 7a. There is enough output to push up, and no large output is required.

  Further, since the liner 23 abuts on the engagement surface 17b with the upper surface 23a having an arcuate cross section (saddle-shaped cross section) shown in FIG. 6, when the swing arm 13 swings, There is little friction with the engaging surface 17b, and the upper knockout pin 7a can be raised smoothly.

When the above-mentioned secondary knockout is completed and the workpiece W reaches the upper limit position, the rod 14a of the hydraulic cylinder 14 is contracted. At this time, the rod 15a of the air cylinder 15 is in an extended state, the swing of the swing arm 13 is restricted, and the workpiece W is held at the upper limit position.
Further, as shown in FIG. 7 (c), the air cylinder 16 also rises as the slide rises above the mold 10, so that the rod 16a of the air cylinder 16 extends, The tip maintains contact with the upper surface of the workpiece W.

And the workpiece | work W is hold | maintained at the finger F of a transfer feeder, as shown in FIG. 8, and is conveyed or carried out.
After the finger F holds the workpiece W, the air cylinder 16 moves further upward along with the slide as shown in FIG. 7D, so that the air cylinder 16 is used for transferring and unloading the workpiece W. It does not interfere.

If the rod 15a of the air cylinder 15 is retracted after the workpiece W is transferred and carried out, the swing arm 13 returns to the original state shown in FIG.
In addition, the mechanical drive mechanism A operates in synchronism with the slide movement of the forging press, and the lower lever 5 swings downward after the completion of the primary knockout.
Thereafter, the next workpiece W is placed on the mold 10 so that the workpiece W completely pushes down the upper knockout pin 7a in the hole 19, and the lower knockout pin 7b is also pushed down by pushing down the upper knockout pin 7a. By being pushed down, the original state shown in FIG.

  In this embodiment, the knockout pin 7 is divided into the upper knockout pin 7a and the lower knockout pin 7b. However, the knockout pin 7 may be integrated without being divided. When the knockout pin 7 is integrated, the lower end of the knockout pin 7 is engaged with the knockout lever 6, and the engagement surface 17b is formed at a position higher than the lower end of the knockout pin 7, The other end 13b of the swing arm 13 may be engaged.

  Further, since the swing arm 13 can be provided separately for each of the knockout pins 7 provided along the flow direction of the forging process, one swingout arm 13 can be adjusted. For example, the knockout amount of each knockout pin 7 can be set individually.

Overall front view showing the configuration of one embodiment 1 is an enlarged side view of the main part of FIG. The principal part enlarged front view which shows the machine drive mechanism of FIG. The principal part enlarged front view which shows the hydraulic drive mechanism of FIG. Explanatory drawing showing the configuration of the hydraulic drive mechanism Enlarged view of the main part of the swing lever Explanatory diagram showing the sequence of knockout operations FIG. 7 is an enlarged view of the main part of FIG.

Explanation of symbols

1 cam 2 roller 3 upper lever 4 connecting rod 5 lower lever 6 knockout lever (timing lever)
6a, 13a Oscillating shaft 7 Knockout pin 7a Upper knockout pin 7b Lower knockout pin 8 Bolster 9 Die holder 10 Mold 11, 14 Hydraulic cylinder 12, 15, 16 Air cylinder 13 Oscillating arm 13b Other end 17a Lower end surface 17b Engagement part (Engagement surface)
18 Guide 19 Hole 23 Liner 23a Liner upper surface 24 Upper end member 25 Main body member F Finger W Workpiece

Claims (2)

A knockout pin 7 that can be raised and lowered to push up the workpiece W of the forging press, a mechanical drive mechanism A that raises the knockout pin 7 via a knockout lever 6 that swings in conjunction with a slide drive shaft of the forging press, and the knockout In the knockout device of the forging press provided with the hydraulic drive mechanism B that raises the pin 7,
The hydraulic drive mechanism B includes a swing arm 13 and a hydraulic cylinder 14 that presses one end of the swing arm 13, and the knockout pin 7 is engaged with the other end of the swing arm 13 above its lower end. A forging press knockout device characterized by having an engaging portion to be engaged, raising the knockout pin 7 by the mechanical drive mechanism A, and further raising the knockout pin 7 by the hydraulic drive mechanism B.   The knockout pin 7 is divided into an upper knockout pin 7a and a lower knockout pin 7b whose lower end engages with the knockout lever 6, and the lower end of the upper knockout pin 7a is engaged with the other end of the swing arm 13. The forging press knockout device according to claim 1, wherein engaging portions are formed.

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