JP2008213013A - Knock-out device for forging press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a workpiece separatable from a lower die with a compact and exclusive ascending/descending means. <P>SOLUTION: In the exclusive ascending/descending means, a crank shaft 2 in the crank mechanism is reciprocatively turned with a servo-motor 1 and the upper end of a connecting rod 4 as the connecting member, is connected with the crank part 2a in the crank mechanism and this lower end part is connected with the basic end part of a shaking lever 6 and further, the crank mechanism, in which a large driving force is output at near upper and bottom dead points, is utilized so as to be able to secure a large knock-out force at the initial stage of the ascendance of a knock-out pin 5 with the small capacity of the servo-motor 1, and thus, the workpiece W can be separated from the lower die 23 with the compact and exclusive ascending/descending means. <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.

  The forging press knockout device that pushes the forged work up from the lower die with a knockout pin and grips it by the fingers of the transfer device, etc., in order to release the work from the lower die with a strong push-up force, In many cases, the swinging shaft of the swinging lever that lifts and lowers the swinging lever is swung in conjunction with the slide drive shaft of the forging press (see, for example, Patent Document 1).

  The type that swings the swing lever in conjunction with the slide drive shaft of such a forging press can release the workpiece with a strong thrust, but the operation timing and speed of the knockout pin that thrusts the workpiece However, it is always the same as the operation of the slide drive shaft that raises and lowers the upper mold, and if the dimensions and shape of the workpiece are changed, the fingers of the transfer device may not be able to reliably grip the workpiece.

  For such problems, the forging press knockout is a type in which one end of the swing lever that raises and lowers the knockout pin is connected to a dedicated lifting means by a connecting member and the workpiece in the lower mold is pushed up by the knockout pin. An apparatus has been proposed (see, for example, Patent Document 2). In the one described in Patent Document 2, the screw shaft of the ball screw is driven to rotate by a servo motor, the upper end of the connecting member is connected to the nut, and the one end side of the swing lever is connected to the lower end of the connecting member. is doing.

JP 2006-218533 A JP 2003-251430 A

  The knockout device of the forging press provided with the dedicated lifting means described in Patent Document 2 can freely change the operation timing and speed of the knockout pin, but the linear driving force of the ball screw driven by the servo motor Therefore, it is necessary to use a large-capacity servomotor to secure a large thrust force to release the workpiece from the lower mold in the early stage of raising the knockout pin, and the dedicated lifting means is enlarged. In addition, there is a problem that becomes expensive. In addition, after releasing a workpiece | work, a knockout pin can be raised with a small thrust.

  Accordingly, an object of the present invention is to enable the workpiece to be released from the lower mold with a compact dedicated lifting means.

  In order to solve the above-described problems, the present invention is configured to connect one end side of a swing lever that is swingably supported by a fulcrum to a dedicated lifting means by a connecting member, and a knockout received by the swing lever. In a knockout device of a forging press that raises and lowers a pin and pushes up a workpiece in a lower mold, the dedicated lifting means is reciprocally rotated by a servo motor with a shaft of a crank mechanism, and the upper end of the connecting member is moved to the crank mechanism A configuration is adopted in which the lower end is connected to one end of the swing lever.

  That is, the dedicated lifting means is reciprocally rotated by the servo motor with the shaft of the crank mechanism, the upper end of the connecting member is connected to the crank of the crank mechanism, and the lower end is connected to one end of the swing lever. By using a crank mechanism that outputs a large driving force in the vicinity of the top and bottom dead center, it is possible to secure a large thrusting force at the early stage of the knockout pin ascent, to reduce the capacity of the servo motor, and a compact dedicated The workpiece can be released from the lower mold with the lifting means. In other words, workpiece knockout requires a large force only at the initial stage of knockout when the workpiece is released from the lower mold. This is the same motion that outputs a large driving force only near the top and bottom dead center of the crank mechanism. Focusing on this, we made it possible to perform knockout with a small capacity servo motor.

  The knock-out device of the forging press according to the present invention has a dedicated lifting means that reciprocally rotates the shaft of the crank mechanism with a servo motor, connects the upper end of the connecting member to the crank of the crank mechanism, and lower end thereof is one end of the swing lever. By using a crank mechanism that outputs a large driving force in the vicinity of the top and bottom dead centers, it is possible to secure a large thrust force at the early stage of the knockout pin ascent. The workpiece can be released from the lower mold by a compact dedicated lifting means. In addition, this knockout device can stop the crank mechanism shaft at an arbitrary rotation position, so that the knockout pin can be held at an arbitrary upper limit position for an arbitrary time, and the dimensions and shape of the workpiece can be reduced. Even if it changes, it can be securely held by the finger of the transfer device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show a first embodiment. As shown in FIGS. 1 and 2, the forging press knockout device includes a forging press frame 21 having a bearing 3 that supports a crankshaft 2 of a crank mechanism that is reciprocally rotated by a servo motor 1. The upper ends of two connecting rods 4 as connecting members are connected to the crank portion 2 a of the shaft 2, and the lower ends thereof are connected to a swing lever 6 that raises and lowers the knockout pin 5. The shaft 6a is rotatably supported by a bearing 7 attached to the lower surface of the bed 22 of the forging press.

  As shown in FIGS. 2 and 3, five swing levers 6 are arranged side by side and attached to a swing shaft 6a. The swing shaft 6a is supported by a bearing 7 at two locations, and the base end on one end side is connected to a connecting rod. A spherical seat 6b for receiving each knockout pin 5 is provided on the tip end side opposite to the swing shaft 6a serving as a fulcrum.

  Hereinafter, the operation of the above-described knockout device will be described. As shown in FIG. 1, the swing lever 6 is in a substantially horizontal state at a position where the crank portion 2 a of the crankshaft 2 is at the top dead center, and the knockout pin 5 is forged in the lower mold 23. Wait directly under the workpiece W. After the workpiece W is forged, the servo motor 1 is driven, and the tip end side of the swing lever 6 begins to rotate upward, and the knockout pin 5 is pushed up with a large force near the top dead center of the crank portion 2a of the crankshaft 2. Then, the work W is released from the lower mold 23. This knock-out device using a crank mechanism for the lifting / lowering means can reduce the workpiece W even if the capacity of the servo motor 1 is reduced to about 60% as compared with the lifting / lowering means described in Patent Document 2 using a ball screw. A sufficient push-up force for releasing the mold from the lower mold 23 can be secured. By the way, it is possible to reduce the capacity of the servo motor by engaging the swing lever with the cam connected to the servo motor, but the cam mechanism requires a large space and the lifting means is designed to be compact. Can not do it.

  After that, as shown in FIG. 4, the front end side of the swing lever 6 is rotated upward with the rotation of the crank portion 2a of the crankshaft 2, and the knockout pin 5 is raised to the upper limit position. When the knockout pin 5 rises to the upper limit position, the servo motor 1 is temporarily stopped, and the knockout pin 5 that pushes up the workpiece W is held at the upper limit position. When the workpiece W is gripped by a finger (not shown) of the transfer device, the servo motor 1 is driven in the reverse direction to rotate the crankshaft 2 so that the crank portion 2a returns to the top dead center. By this rotation, the tip end side of the swing lever 6 is rotated downward, and the knockout pin 5 is lowered by its own weight.

  FIG. 5 shows a second embodiment. In this forging press knockout device, the basic swing mechanism of the swing lever 6 is the same as that of the first embodiment, and two servo motors 1 for rotating the crankshaft 2 are provided. Each servo motor 1 is different in that it is connected to the left and right sides of the crankshaft 2 via two-stage gear mechanisms 9a and 9b. Other portions are the same as those of the first embodiment, and the swing shaft 6 a of the swing lever 6 is connected to the crank portion 2 a of the crank shaft 2 by two connecting rods 4.

  In each of the above-described embodiments, the swing lever receives the knockout pin on the side opposite to the connecting side of the connecting member with respect to the fulcrum, and the connecting side of the connecting member is pushed down, so that the knockout pin is near the top dead center of the crank portion. The swing lever receives a knockout pin on the same side as the connecting side of the connecting member with respect to the fulcrum, and the connecting side of the connecting member is pulled up, so that the vicinity of the bottom dead center of the crank portion It is also possible to start pushing up the knockout pin. The distance from the fulcrum of the swing lever to the connecting position of the receiving part of the knockout pin and the connecting member can be arbitrarily set regardless of whether they are the opposite side or the same side, up to the connecting position of the connecting member. If the distance to the receiving portion of the knockout pin is reduced with respect to the distance, the push-up force can be increased. Conversely, if the distance is increased, the push-up stroke of the knockout pin can be increased.

  In each of the above-described embodiments, the crankshaft in which the crank portion is integrally formed is used as the crank mechanism of the elevating means. However, this crank mechanism may be configured such that a separate crank rotates around the shaft. .

The front view which shows the knockout apparatus of the forge press of 1st Embodiment. Notched side view of FIG. Sectional view along line III-III in FIG. The front view which shows the state which raised the knockout pin of FIG. Notched side view showing the knockout device of the forging press of the second embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Servo motor 2 Crankshaft 2a Crank part 3 Bearing 4 Connecting rod 5 Knockout pin 6 Swing lever 6a Swing shaft 6b Spherical seat 7 Bearing 8 Connection shaft 9a, 9b Gear mechanism 21 Frame 22 Bed 23 Lower mold

Claims (1)

  One end of the swing lever supported swingably on the fulcrum is connected to a dedicated lifting means by a connecting member, and the knockout pin received by this swing lever is lifted to move the workpiece in the lower mold. In the knockout device of the forging press that pushes up, the dedicated lifting means is reciprocally rotated by the servo motor with the shaft of the crank mechanism, the upper end of the connecting member is connected to the crank of the crank mechanism, and the lower end is connected to the swing lever. A knockout device for a forging press characterized by being connected to one end side of the forging press.

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