JPS58199636A - Extruding mechanism in former - Google Patents

Abstract

PURPOSE:To extrude safely and exactly a base material bitting at a punch, by constituting so that movement of an extruding pin by pushing is executed at an optional time in the course of a series of operations extending over an advance and a retreat of a moving ram, in a punch side knockout device. CONSTITUTION:An extruding pin 2 provided on a punch 1 side is extruded at every operation of a moving ram 6 by an extruding lever 3 depressed by a rotary cam 5 interlocked with a driving shaft 4. In this case, the cam 5 is provided on the ram 6 side, also a cam shaft 7 of the cam and the shaft 4 are connected by bendable link pieces 14, 15 in an intermediate hinge part 13, and interlocking gears 16-20 for transferring a rotation of the shaft 4 to the cam 5 are provided in series on the link piece. In this state, when the rotation of the shaft 4 is transferred to the shaft 7 by being related to one reciprocative motion of the ram 6 by a crank motion by the rotation of the shaft 4, the lever 3 and the pin 2 are extruded in the direction (a) and the direction (b), respectively, by the cam 5, and a base material 27 bitting at the tip of the punch 1 is pushed down. In this way, the operating time of the pin can be set optionally, for instance, extending from the retreat start of the ram 6 immediately after punching to the final retreat position, by a shape of the cam 5, a gear ratio of the gears 16-20, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides that when pressing a punch against a die mold to form a metal material, the wood pressed inside the die bites into the punch side as the punch retreats. The so-called punch-side knockout (PKO,
,) regarding the device.

1ml of PKO9At in Homa has traditionally been a general 1/
It is known that the conventional device moves the ejector pin installed in the nozzle into the final retracted position of the ram. Generally, a push lever was brought into contact with a cam provided at the fixed base to push out the product.

However, in such a conventional device, the timing of pushing the ejector pin located on the fixed frame side is different from the ejector pin provided on the movable ram side. This is when the moving ram moves forward and then begins to move backward until it reaches its final retreat position, and since the period of movement is always constant, it is impossible to move for a sufficient period of time.
As a result, it is not possible to safely and accurately push out the material that has been bitten by the punch, and therefore, the next punch is performed at the same time as the blank is punched, which often results in double punches and other accidents. There was a drawback that could not be avoided.

This invention is an improvement on the conventional drawbacks, and the pushing movement of the ejector pin is controlled by the final dk withdrawal of the moving ram 1M.
Needless to say, the object of this invention is to eliminate all of the above-mentioned drawbacks of the prior art by making it possible to carry out the operation at any set time during a series of movements from forward movement to backward movement. Therefore, in this invention, an extrusion lever that pushes an extrusion pin;
Both of the rotary cams that push it are provided on the side of the movable ram that is moved forward and backward by the crank dA#, and the drive shaft of the crank pin structure and the cam shaft of the rotary cam are always in a constant relationship regardless of distance movement. It is structured so that it maintains the same and interlocks with each other.

The details will be explained below with reference to the drawings. In FIG. 1, l is a punch, 2 is an ejection pin equipped on the punch sword, and 3 is an ejection lever that is pressed down by a rotating cam 5 that is linked to the rotation 44, and is activated every time the movable ram 6 moves. do.

The rotary cam b has its cam 47 rotatably supported by a bearing 8 provided on the movable ram 6L, and rotates while cooperating with the movable ram 6. The movable ram 6 is composed of a -m4114 and a crank 1119, and is mounted on a fixed frame 12 so as to be interlocked with a crank machine #110 via a crank pin 11, and the fixed frame 12 is moved every time the crank operates once. It reciprocates back and forth using the guide.

The cam 1@7 and rotation 14II4 of the rotary cam 5 are driven by the cam 44I37 provided on the movable ram side.
1 is pivoted on the side of the footrest 41!11112, the distance between the two shafts 4 and 7 always changes wide and narrow as the moving ram 6 moves back and forth, but regardless of the wide and narrow displacement, the distance between the two shafts 4 and 7 changes. -4,71- The intermediate hinge part 13 is connected by bent link pieces 14 and 15, and the seventh link piece is provided with interlocking gears 16, 17, 18, 19, and 20. 7 are interlocked, so the rotation of the drive 4 is transmitted to the cam 114I17 through these.

The s-output bar 3 is of a bell crank type and has a support 11i1 pivoted on a pair of left and right bearings 21 installed on the moving ram 6.
A vertical arm 3bt-extrusion pin 2 is installed on the horizontal arm 3a4 that swings back and forth at 22, and is provided with a roller 23 that makes contact with the rotating cam 5 and protrudes downward. Make it correspond to the rear 4 parts of. 4! The straight arm 3b is provided with a contact body 24 for the push-out pin 2, and a detection body 25 consisting of a load cell for detecting the push-out resistance of the push-out pin 2 is incorporated in this surface body in a pinching manner.

When the moving ram 6 moves forward and presses the punch lt into the corresponding die mold, the gold I14 material 27 is pressed into a predetermined shape. The cable material 27 that has been pushed out may bite into the punch 1 side and may not separate from the punch 1 even if the punch returns to the predetermined position.

In such a state, the rotation of the drive lI 4114 causes the moving ram 6 to make one reciprocating motion due to the crank motion, and the first rotation of the drive m passes through the interlocking gear 16 and the camshaft 7.
When the power is transmitted to the camshaft 7, the rotary cam 6 provided on the camshaft 7 moves together with the camshaft 7, so that the push lever 3, which is in contact with the camshaft 7, is rotated clockwise (arrow A) in FIG. As a result, the vertical frame 3b pushes the extrusion pin 2t forward (indicated by the arrow), and in order to push the stripper 9 fitted to the outer periphery of the punch via the interlocking pin 4, the cable material 27 bitten at the tip of the punch is pushed. It is something that sharpens.

Depending on the shape of the rotary cam 5, the gear ratio of each interlocking gear 16 to 20, etc., the operating timing of the push pin 2 is determined, for example, from when the movable ram begins to retreat immediately after punching until the final retreat position 1. It can be set arbitrarily up to the point where it is reached.

As explained in the excavation, this invention is provided on the movable ram side in place of the rotating cam conventionally provided on the stationary side, and the cam shaft of this rotating cam and the drive/pongee are connected by a link piece that can be bent at the intermediate hinge part. Since an interlocking gear that transmits the rotation of the drive shaft to the rotary cam is connected to the seventh link piece in series, the drive sleeve, rotary cam, and r link piece are connected even when the movable ram is moving near and far. Since the rotary cam can be rotated at any position during the movement of the movable ram, the pushing timing of the ejector pin can be moved earlier than before. In addition to being able to quickly push out the material stuck to the punch,
You can freely select the tie arrangement, and in the case of multiple stages, you can make combinations such as making the PKO of each stage have a change sound in the phase pressure or keeping it constant, making it even more convenient.Adjustment and disassembly and assembly are also easy. It is easy to operate and can be carried out at low cost.

[Brief explanation of drawings]

The drawings show a practical example of this invention, in which Fig. 1 is a longitudinal cross-sectional side view of the forging device section in Homer, and Fig.
A longitudinal sectional view taken from the A-A side in the figure, Fig. 3 is a cross-sectional view of a part of the interlocking gear attached to the link piece, and Fig. 44 is an enlarged sectional view of the main part when the detector is incorporated into the push lever. It is. l...Punch 2...Ejection pin 3...Ejection lever 4...Drive shaft 5...Rotating cam 6.
...Moving ram 7...Camshaft 13...Intermediate hinge portions 14, 15...Link pieces 16~Application...Interlocking gear Applicant: Sakamura Machinery Co., Ltd.

Claims (1)

[Scope of Claims] A device in which an extrusion pin installed on the punch side is extruded by an extrusion lever pressed down by a rotating cam interlocked with a moving shaft for each movement of a movable ram, wherein said rotating cam is It is installed on the moving ram side. The cam shaft of this rotary cam and the dA blocker are connected at the intermediate hinge portion by a link piece capable of turning one turn, and an interlocking gear for transmitting the rotation of the drive shaft to the rotary cam is provided in series on the seventh link piece. An extrusion mechanism in a homa characterized by: