JPH0516151A - Push-up mechanism of mold - Google Patents

Abstract

PURPOSE:To reduce the push-out stroke of a first push-out plate having a push-up pin and to allow a molded product to automatically fall by constituting a stripper plate and a slide core so that both of them are reversed at the time of release to gradually make a backward movement. CONSTITUTION:At first, a first push-out plate 41 is driven by a knock rod 6 so as to be pushed up. At this time, since a second push-out plate 42 is engaged with the first push-out plate 41, the second push-up plate 42 is driven so as to be pushed up along with the first push-out plate. Therefore, a push-up pin 44 and a stripper plate 4 are driven so as to be pushed up in such a state that the definite distance between them is held and the stripper plate releases a molded product from the surface of a movable mold. Next, a reversal mechanism 45 is operated and the engagement of the first push-out plate and the second push-out plate is released and the second push-out plate is moved in the direction opposite to the push-up direction of the first push-out plate, that is, in the direction returning to the position immediately after molding. Therefore, the distance between the push-up pin and the stripper plate is opened and the opening end surface of the molded product bonded to the push-up pin is released from the stripper plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pushing-up mechanism used when a molded body is released from a die surface of a molding die, and more particularly to a two-stage pushing-up mechanism having a stripper plate.

[0002]

2. Description of the Related Art For example, when a cylindrical molded body having an undercut portion on its outer peripheral surface is released from the mold, when the molded body is automatically dropped in order to shorten the molding cycle, the molds as shown in FIGS. A push-up mechanism is adopted. This mold is
Fixed mold 100, movable mold 200, and slide core 300
It consists of Usually in such molding,
In order to automatically drop the molded body 500, a molding machine that drives the opening and closing of the mold horizontally with respect to the molding machine is used.
The pushing-up mechanism forms the open end of the molded body 500 and pushes up the molded body 500 to release it from the movable die 200, and push-up for releasing the molded body 500 from the surface of the stripper plate 400. It is composed of a first extruding plate 401 which has a pin 402 and is pushed up and driven by a knock rod 600, and a second extruding plate 403 which is detachably locked to the first extruding plate 401 and is connected to the stripper plate 400. ..

In this lifting mechanism, first, the fixed die 100
When the movable die 200 is opened, the slide core 300 is slid by the action of the inclined pin 101 extending from the fixed die 100, and the outer peripheral surface of the molded body 500 is released. Next, the knock rod 600 is driven to push up the first extruding plate 401. At this time, since the second push plate 403 is locked to the first push plate 401 by the cam 404, it moves together with the first push plate 401. As a result, the stripper plate 400 moves together with the second extruding plate 403, and pushes up the compact 500 as shown in FIG. 7 to release it from the die surface of the movable die 200.

In this state, the molded body 500 adheres to the stripper plate 400 and it is difficult to automatically drop it. Therefore, in a state where the opening of the molded body 500 has moved to the maximum convex portion of the movable die 200 or more, the stopper 201 extending from the movable die 200 contacts the second extrusion plate 403 as shown in FIG. Regulate movement. This allows the cam 40
4 is released, and only the first push plate 401 is pushed up and driven. Therefore, as shown in FIG. 8, the push-up pin 402 pushes up the molded body 500, and the molded body 500 is released from the stripper plate 400, so that it can be automatically dropped and the molding cycle can be shortened.

[0005]

However, in the conventional pushing-up mechanism described above, since the slide core 300 is slidably provided on the stripper plate 400, the slide core 30 is driven by driving the second extruding plate 403.
0 also moves with the stripper plate 400. The opening and closing of the mold is driven horizontally with respect to the molding machine. Therefore, in order to automatically drop the molded body 500, after the molded body 500 is pushed up above the highest convex portion of the movable die 200, the slide core 3 is further pushed by the push-up pin 402.
It is necessary to push it up to a position where it does not interfere with 00.

Therefore, the stroke for pushing up the knock rod 600 becomes long, and for example, the total height of the molded body 500 is 1.5-.
Double the length is required. Therefore, it is necessary to change the molding machine to a large one, or to install a hydraulic cylinder device for pushing up in the mold, and the space for arranging equipment,
There was a problem in terms of cost. Further, as a means for solving this, it is conceivable to urge the second extruding plate 403 toward the mounting plate 501 with a spring or the like. However, according to this method, the second push plate 403 collides with the mounting plate 501 at the same time when the engagement of the cam 404 is released, which not only causes a collision noise but also may cause damage to the mold.

Further, a method may be considered in which the opening and closing of the mold is driven in the vertical direction with respect to the molding machine and the second extruding plate 403 is dropped by its own weight, but in this case, the same problem as described above is also present. Not only that, the opening and closing of the mold is driven in the vertical direction with respect to the molding machine, so that there is a problem that the automatic falling of the molded product cannot be performed well. The present invention has been made in view of the above circumstances, and it is possible to prevent a mold from colliding and enable a molded product to be released from a mold even if the pushing stroke is shortened and to be automatically dropped. With the goal.

[0008]

SUMMARY OF THE INVENTION A push-up mechanism of the present invention for solving the above-mentioned problems includes a stripper plate for releasing a molded body from a mold surface of a movable die, and a molded body for releasing the molded body from the surface of the stripper plate. A first extruded plate having a push-up pin and driven to be pushed up by a knock rod, a second extruded plate that is detachably locked to the first extruded plate and connected to the stripper plate, and a second extruded plate together with the first extruded plate. And a reversing mechanism that, when driven by a predetermined distance, pushes the second extrusion plate in the direction opposite to the pushing drive to release the lock and separates it from the first extrusion plate, and moves the stripper plate in the direction opposite to the pushing drive. It is characterized by consisting of.

The most important feature of the present invention is that it has a reversing mechanism for mechanically reversing the upward movement. This inversion mechanism, when the second push-out plate and the first push-out plate are driven to be pushed up by a predetermined distance, pushes the second push-out plate in the direction opposite to the push-up drive to release the locking with the first push-out plate. As a result, the second extruding plate is separated from the first extruding plate, but the reversing mechanism further moves the second extruding plate in the direction opposite to the push-up drive and moves the stripper plate in the direction opposite to the push-up drive. At this time, since the first push-out plate continues to be pushed up, the pressing direction of the push-out pin and the moving direction of the stripper plate are opposite to each other, and the molded body is released from the stripper plate.

There are various conceivable examples of this reversing mechanism, such as one utilizing the action of a "lever" as shown in the embodiment and one utilizing a gear such as a rack and a pinion.

[0011]

In the pushing-up mechanism of the present invention, first, the first pushing plate is pushed up and driven by the knock rod. At this time, since the second extrusion plate is locked to the first extrusion plate,
It is pushed up and driven together with the first extrusion plate. Therefore, the push-up pin and the stripper plate are driven to push up while maintaining a constant distance, and the stripper plate releases the molded body from the movable mold surface.

Next, the reversing mechanism is actuated, and the first pushing plate and the second pushing plate
When the push plate is unlocked, the second push plate
It moves in the direction opposite to the pushing-up direction of the extruded plate, that is, in the direction returning to the position immediately after molding. Therefore, the distance between the push-up pin and the stripper plate is increased, and the opening end surface of the molded body attached to the push-up pin is released from the stripper plate.

Therefore, according to the pushing-up mechanism of the present invention, since the stripper plate and the slide core reverse and gradually move backward during the mold release, the pushing stroke of the first pushing plate having the pushing-up pin is reduced as compared with the conventional case. be able to. This eliminates the need to change the molding machine to a large one or to install a hydraulic cylinder device in the mold.
The molded body can be automatically dropped. Therefore, shortening of the molding cycle and reduction of cost are achieved. Also, since it moves gradually, there is no risk of damage due to collision of the molds.

[0014]

EXAMPLES The present invention will be specifically described below with reference to examples. (Embodiment 1) FIGS. 1 to 3 show an injection molding die adopting a push-up mechanism according to an embodiment of the present invention. This mold is
Forming a bottomed cylinder having a fixed die 1, a movable die 2 that is horizontally opened and closed with respect to the fixed die 1, a slide core 3, and a stripper plate 4, and having an undercut portion 50 on the outer peripheral surface. The body 5 is shaped. The fixed mold 1 molds the outer surface of the bottom of the molded body 5, and the movable mold 2 molds the inner peripheral surface. The slide core 3 is slidably held on the surface of the stripper plate 4, and forms the outer peripheral surface of the molded body 5 and the undercut portion 50. The slide core 3 is engaged with a tilt pin 10 (not shown) extending from the fixed die 1.
Then, the stripper plate 4 molds the entire circumference of the opening end surface of the molded body 5.

A first push-out plate 41 and a second push-out plate 42 are arranged at positions separated from the movable mold 2 by a predetermined distance, and are integrally locked by a cam 43. A push-up pin 44 extends from the first extruding plate 41 so as to penetrate the movable die 2. This first
A bar 45 is swingably and pivotally supported on the push-out plate 41. Then, the pressing rod 20 projects at a position facing substantially the center of the bar 45 of the movable die 2, and when the first extruding plate 41 and the second extruding plate 42 are driven, the pressing rod 20 presses the bar 45 and shakes. It is configured to move. The stripper plate 4 is fixed to the second extruding plate 42 via a connecting rod 46, and the stripper plate 4 is configured to be movable in a direction away from the movable die 2 by driving the second extruding plate 42.

In the molding die constructed as described above,
After the molding is completed, first, the fixed mold 1 and the movable mold 2 are opened.
Then, the slide core 3 slides in the direction away from the molded body 5 by the tilt pin 10 (not shown), and the outer peripheral surface of the molded body 5 is released. Next, the knock rod 6 is driven to push up the first extruding plate 41. At this time, the second push-out plate 42 is also pushed up by the engagement of the cam 43. Then, the stripper plate 4 is also pushed up together with the slide core 3 via the connecting rod 46, and the molded body 5 is pushed up by the stripper plate 4 and released from the movable die 2 as shown in FIG.

Here, before the molded body 5 is completely released from the mold surface of the movable mold 2, that is, immediately after the state of FIG.
Are configured to abut the bar 45. Therefore, when the knock bar 6 further advances after the pressing rod 20 contacts the bar 45, the bar 45 swings around the pivot shaft to move the second pushing plate 42 in the direction opposite to the direction in which the knock rod 6 is pushed up. Press. Then, the engagement of the cam 43 is released, and the first pushing plate 41 and the second pushing plate 42 are separated. As the knock bar 6 further advances, the bar 45 further swings to gradually push back the second extruding plate 42 to the state shown in FIG. 1 at the time of molding.

As a result, the stripper plate 4 and the slide core 3 move in the direction opposite to the direction in which the push-up pin 44 is pushed up, and the molded body 5 is released from the stripper plate 4. Then, the push-up pin 44 further pushes up the molded body 5, and the slide core 3 moves together with the stripper plate 4 in the opposite direction. Therefore, as shown in FIG. 3, when the molded body 5 projects from the highest convex portion of the movable mold 2, the slide core 3 is in a position where it does not interfere with the falling direction of the molded body 5 (downward direction in the figure). Body 5
It is possible to automatically drop.

Further, the second extruding plate 42 is gradually pushed back, so that the second extruding plate 42 is prevented from colliding with the mounting plate 21 and there is no risk of damage to the mold. That is, according to the pushing-up mechanism of the molding die of the present embodiment, the moving distance of the push-up pin 44 can be shortened and the molded body 5 can be automatically dropped as compared with the conventional case, so that the moving distance of the knock rod 6 is short. Therefore, the molding cycle can be shortened, and the size of the molding machine and the installation of the hydraulic cylinder device are not required, and the cost can be reduced. (Embodiment 2) FIGS. 4 and 5 show the essential parts of a molding die which employs the lifting mechanism of the second embodiment. This mold has the same structure as the mold used in Example 1 except that the structure of the pushing-up mechanism is different, and the description thereof will be omitted.

The pushing-up mechanism of this embodiment has the first pushing plate 4
1, a second extruding plate 42 that is detachably locked to the first extruding plate 41 by a cam (not shown), a shaft 60 that is rotatably held in the first extruding plate 41, and is fixed to the shaft 60. The small-diameter pinion 61 and the large-diameter pinion 62, and the floating rack 71 and the fixed rack 72 screwed to the small-diameter pinion 61 and the large-diameter pinion 62.

The large-diameter pinion 62 is fixed to the shaft 60 at a small distance from the small-diameter pinion 61.
It has a larger diameter. The floating rack 71 is the first
The extruded plate 41 is slidably held in the longitudinal direction and is screwed to the small diameter pinion 61. Then, in the state shown in FIG. 4 when the molding is completed, the floating rack 71 projects from the first pushing plate 41 by a predetermined length. The fixed rack 72 has a second end at one end.
It is fixed to the push-out plate 42 with bolts 73, extends in parallel with the floating rack 71, and is screwed into the large-diameter pinion 62.

In the molding die having the pushing-up mechanism of the present embodiment constructed as described above, the first extruded plate 41 after the mold is opened.
When the second pushing plate 42 is pushed up and driven, the floating rack 71 and the fixed rack 72 move together with the first pushing plate 41 and the second pushing plate 42. When the molded body 5 is released from the mold to the position shown in FIG. 2, the tip of the floating rack 71 comes into contact with the movable mold 2 and its movement is restricted at that position.

Then, the small diameter pinion 61 is attached to the first extruding plate 4
When it is pushed up by 1 and is screwed with the floating rack 71, it starts rotating. This rotation is from the shaft 60 to the large diameter pinion 62.
To the fixed rack 7 by the rotation of the large diameter pinion 62.
2 starts moving in the direction opposite to the pushing direction. Therefore, the second extrusion plate 42 is fixed by the fixed rack 72 to the first extrusion plate 41.
Since they are separated from each other and gradually move in the direction opposite to the push-up driving direction, the same action and effect as those of the first embodiment can be obtained.

At the time of mold clamping, the first extruding plate 41 is moved to the second extruding plate 41 by a return pin (not shown) provided on the first extruding plate 41.
The large-diameter pinion 62 is moved so as to be close to the push-out plate 42.
Rotation of the small diameter pinion 61 causes the floating rack 7 to rotate.
Return 1 to the original position. In the present embodiment, the movement amount of the second extruding plate 42 can be easily adjusted by adjusting the difference in diameter between the small diameter pinion 61 and the large diameter pinion 62.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a mold having a lifting mechanism according to an embodiment of the present invention during mold clamping.

FIG. 2 is a cross-sectional view of a main part of a mold having a lifting mechanism according to an embodiment of the present invention during lifting.

FIG. 3 is a sectional view of an essential part of a mold having a lifting mechanism according to an embodiment of the present invention when the lifting is completed.

FIG. 4 is a sectional view of an essential part of a mold having a lifting mechanism according to a second embodiment of the present invention when the mold is clamped.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a cross-sectional view of a main part of a mold having a conventional lifting mechanism when the mold is clamped.

FIG. 7 is a cross-sectional view of a main part of a metal mold having a conventional lifting mechanism during lifting.

FIG. 8 is a cross-sectional view of a main part of a mold having a conventional lifting mechanism when the lifting is completed.

[Explanation of symbols]

1: Fixed type 2: Movable type
3: slide core 4: stripper plate 5: molded body
6: Knock rod 41: First extrusion plate 42: Second extrusion plate 4
3: Cam 44: Push-up pin 45: Bar 6
0: Shaft 61: Small diameter pinion 62: Large diameter pinion 7
1: Floating rack 72: Fixed rack

Claims (1)

Claim: What is claimed is: 1. A stripper plate for releasing a molded body from a mold surface of a movable die, and a push-up pin for releasing the molded body from the surface of the stripper plate. A first extruded plate, a second extruded plate that is separably locked to the first extruded plate and connected to the stripper plate, and the second extruded plate is driven up by a predetermined distance together with the first extruded plate. And a reversing mechanism that pushes the second extruding plate in the direction opposite to the pushing-up drive to release the lock to separate it from the first extruding plate and move the stripper plate in the direction opposite to the pushing-up drive, A push-up mechanism for a molding die, which is made of