JP2008221268A - Knockout apparatus for forming press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a knockout apparatus for a forging press in which upper limit position of knockout can easily be adjusted. <P>SOLUTION: One pair of turning levers 4 is pivoted in a freely swingable fashion by a rocking shaft 1 rocking in conjunction with a slide-driving shaft in the forging press, wherein the turning levers 4 are connected with a receiving bar 4a which is kicked up with a rocking bar 2 from below and receives knockout pins 3: a hydraulic cylinder 5 is provided for a hydraulic pushing-up mechanism for pushing down the turning levers 4 at the side opposite from the receiving bar 4a with respect to the rocking shaft 1 thereby ascending the knockout pins 3; and a height-adjustable hydraulic cylinder 6 is provided for stopping the upward turning of the turning levers 4 at the side same with the receiving bar 4a with respect to the rocking shaft 1 thereby regulating the upper limit position of the knockout pin 3. The upper limit position of the knockout can easily be adjusted as a result. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a knockout device for a forging press that pushes a work in a lower die of a forging press with a knockout pin.

  Forging press knockout device that pushes up the forged workpiece from the lower die and grips it by the fingers of the transfer device, etc. The slide drive of the forging press is used to release the workpiece from the lower die with a strong pushing force. Many mechanical push-up mechanisms that raise a knockout pin with a swing lever attached to a swing shaft that swings in conjunction with the shaft are used.

  However, the knockout device of the mechanical push-up mechanism can push up the workpiece with a strong force and can reliably remove the workpiece from the mold, but the knockout pin that pushes up the workpiece operates in conjunction with the slide drive shaft. For this reason, there is a problem in that the workpiece cannot be held at an appropriate height and cannot be reliably gripped by a finger or the like of the transfer device.

  For such a problem, there is one in which the thrust stroke by the mechanical thrust mechanism is made smaller than the required stroke, and the remaining stroke is softly thrust by the hydraulic thrust mechanism using a hydraulic cylinder (for example, Patent Document 1). In the device disclosed in Patent Document 1, a hydraulic (hydraulic pressure) cylinder is connected to a swing lever, and a knockout pin is raised by a hydraulic push-up mechanism via the swing lever. In addition, a flange portion is provided on the uppermost knockout pin that is divided, and this flange portion is brought into contact with a stopper incorporated in the lower mold to regulate the upper limit position of the knockout pin.

  The swing lever of the mechanical push-up mechanism has a large inertial mass to ensure a strong push-up force. For this reason, the hydraulic push-up mechanism described in Patent Document 1 has a drawback that a large-capacity hydraulic cylinder is required to swing a swing lever having a large inertial mass. In order to eliminate such difficulties, there is also a knockout device in which the knockout pin is divided into upper and lower parts and only the upper knockout pin is raised by a hydraulic cylinder of a hydraulic push-up mechanism (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 64-42737 JP 2006-218533 A

  The knockout device of the forging press needs to be pushed up to a predetermined height (upper limit) so that the workpiece pushed up by the knockout pin is securely held by the finger of the transfer device, etc. It depends on. Moreover, in order to make the positional relationship with a finger etc. appropriate, it is desired that the upper limit position can be easily adjusted. In Patent Document 1, since the upper limit position is regulated by bringing the flange portion of the knockout pin into contact with the stopper, the workpiece can be pushed up to the upper limit position, but the upper limit position can be easily adjusted. I can't.

  Moreover, although what was described in patent document 2 can make the hydraulic cylinder of a hydraulic thrust mechanism small capacity | capacitance, again, the upper limit position of knockout cannot be adjusted easily.

  Then, the subject of this invention is providing the knockout apparatus of the forge press which can adjust the upper limit position of knockout easily.

  In order to solve the above-described problems, the present invention provides a knockout pin that pushes up a work in a lower die of a forging press and a swing attached to a swinging shaft that swings in conjunction with a slide drive shaft of the forging press. In a knockout device of a forging press having a mechanical push-up mechanism that is lifted by a lever and a hydraulic push-up mechanism that lifts the knockout pin using a hydraulic cylinder, the swinging shaft is kicked from below by the swinging lever. And a pivoting lever provided with a receiving portion for receiving the knockout pin is pivotally mounted, and the pivoting lever is disposed on the opposite side of the pivoting shaft from the receiving portion of the knockout pin. A hydraulic cylinder of a hydraulic push-up mechanism is provided, and the rotating lever is turned upward on the same side as the receiving portion of the knockout pin with respect to the swing shaft. The stopper was adopted a structure in which a height-adjustable stopper for restricting the upper limit position of the knock-out pin.

  That is, a pivoting lever that is kicked up from below by a pivoting lever and provided with a receiving portion for receiving a knockout pin is pivotally mounted, and the pivoting lever is pivoted with respect to the pivoting shaft. The hydraulic cylinder of the hydraulic push-up mechanism is provided on the opposite side of the knock-out pin receiving part, and the upward rotation of the rotary lever is stopped on the same side as the knock-out pin receiving part with respect to the swinging shaft. The upper limit position of the knockout can be easily adjusted by providing a stopper capable of adjusting the height to regulate the upper limit position of the knockout.

  By providing the height-adjustable stopper with a sensor for detecting the height and adjusting the height with a hydraulic cylinder, the upper limit position can be adjusted quickly and continuously. As the sensor for detecting the height, a stroke sensor built in the hydraulic cylinder, a displacement sensor mounted outside, or the like can be used.

  The knockout device of the forging press according to the present invention is a pivot in which a receiving shaft for receiving a knockout pin is provided on a swinging shaft that swings in conjunction with a slide drive shaft of the forging press. A lever is pivotally attached, and a hydraulic cylinder of a hydraulic push-up mechanism is provided on the opposite side of the pivot lever from the receiving portion of the knockout pin. On the same side as the receiving part, the upper rotation position of the rotation lever is stopped and the stopper that can adjust the height that regulates the upper limit position of the knockout pin is provided, so the upper limit position of the knockout can be easily adjusted it can.

  By providing the height-adjustable stopper with a sensor for detecting the height and adjusting the height with a hydraulic cylinder, the upper limit position can be adjusted quickly and continuously.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the forging press knockout device is a swing lever 2 attached to a swing shaft 1 that swings in conjunction with a slide drive shaft (not shown) of the forging press. A mechanical push-up mechanism that raises the knock-out pin 3 that pushes up the work W in the lower mold 21 via a receiving bar 4a as a receiving portion of the knock-out pin 3 that connects a pair of rotating levers 4 and a swing shaft A rotation lever 4 pivotally attached to 1 and is pushed down by a hydraulic cylinder 5 on the side opposite to the receiving bar 4a of the knockout pin 3, and a hydraulic push-up mechanism for raising the knockout pin 3 is provided. 4 is the same side as the receiving bar 4a, and the upward rotation is stopped by a hydraulic cylinder 6 as a stopper, and the upper limit position of the knockout pin 3 is regulated to be adjustable. That.

  The rocking shaft 1 is supported at three locations by a bearing 7 on a bed bottom surface 22 of a forging press, and is connected to an upper lever 10 that engages with a cam 8 driven in synchronization with a slide drive shaft via a roller 9. 11 is rotated by a lower lever 12 connected at 11, and swings one reciprocating motion with respect to one rotation of the cam 8. The upper lever 10 is fixed at the base end by a pin 13 and is urged downward by an air cylinder 14 so that the roller 9 is engaged with the cam 8.

  Further, the hydraulic cylinder 6 has a built-in stroke sensor for detecting the height position as a stopper, and the height of the hydraulic cylinder 6 can be easily and quickly adjusted steplessly according to the shape of the workpiece W. It can be done.

  As shown in FIGS. 2 and 3, the swing lever 2 includes a cylindrical portion 2 a that is externally fixed to the swing shaft 1 and a plurality of lever portions 2 b, and is provided at the same axial position as the knockout pin 3. Each lever portion 2 b kicks up each knockout pin 3 via the receiving bar 4 a of the rotating lever 4.

  The pair of rotating levers 4 are connected at both ends by pipe-like connecting members 15 and 16, and the hydraulic cylinder 5 is brought into contact with the central part of the connecting member 15 which is passed to the opposite side of the receiving bar 4a. A cylinder abutting portion 15a to be contacted is provided, and a stopper abutting portion 16a to which a hydraulic cylinder 6 as a stopper abuts is provided at the central portion of the connecting member 16 that is passed to the same side as the receiving bar 4a. ing. The hydraulic cylinder 5 and the hydraulic cylinder 6 are suspended from the bed bottom surface 22 and are in contact with the upper surfaces of the cylinder contact portion 15a and the stopper contact portion 16a, respectively.

  Hereinafter, the operation of the above-described knockout device will be described. First, as shown in FIG. 4A, when the workpiece W in the lower die 21 is forged, the swing lever 2 attached to the swing shaft 1 interlocked with the slide drive shaft swings. The knockout pin 3 is strongly kicked up via the receiving bar 4 a of the rotating lever 4, and the workpiece W is released from the lower mold 21. Thereafter, as shown in FIG. 4B, the hydraulic cylinder 5 is operated, and the rotation lever 4 is rotated upward until the stopper contact portion 16 a of the connecting member 16 contacts the hydraulic cylinder 6. Then, the knockout pin 3 is raised to the upper limit position and held until the workpiece W is gripped by a finger (not shown) of the transfer device. When the workpiece W is gripped by the fingers, the hydraulic cylinder 5 is contracted, and the knockout pin 3 is lowered by its own weight.

  In the embodiment described above, the hydraulic cylinder is used as the stopper that regulates the upper limit position of the knockout pin. However, this stopper may be any one that can adjust the height, and may be a screw jack or the like.

Notched front view showing an embodiment of a knockout device of a forging press Notched plan view of FIG. Sectional view along line III-III in FIG. a and b are sectional views for explaining the operation of the knockout device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oscillation shaft 2 Oscillation lever 2a Cylinder part 2b Lever part 3 Knockout pin 4 Rotating lever 4a Receiving bar 5, 6 Hydraulic cylinder 7 Bearing 8 Cam 9 Roller 10 Upper lever 11 Connecting rod 12 Lower lever 13 Pin 14 Air cylinder 15 Connecting member 15a Cylinder contact portion 16 Connecting member 16a Stopper contact portion 21 Lower mold 22 Bed bottom surface

Claims (2)

  A mechanical push-up mechanism that raises a knock-out pin that pushes up a workpiece in a lower die of the forging press with a swinging lever attached to a swinging shaft that swings in conjunction with the slide drive shaft of the forging press, and the knockout pin In a forging press knockout device having a hydraulic push-up mechanism that lifts the lift using a hydraulic cylinder, a receiving portion is provided on the swing shaft that is kicked up by the swing lever from below and receives the knockout pin. A pivoting lever is pivotally mounted, and a hydraulic cylinder of the hydraulic push-up mechanism is provided on the opposite side of the pivoting shaft from the receiving portion of the knockout pin. On the same side as the receiving part of the knockout pin with respect to the moving shaft, the upward rotation of the rotation lever is stopped, and the upper limit position of the knockout pin is stopped. Knockout apparatus forging press, characterized in that a stopper capable of height adjustment for regulating the.   The fork press knockout device according to claim 1, wherein the height-adjustable stopper is provided with a sensor for detecting the height, and the height is adjusted by a hydraulic cylinder.

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