JP5537259B2 - Mold release apparatus and mold release method - Google Patents

Description

  The present invention relates to a molded product release apparatus and a release method for releasing a molded product of a metal product such as an aluminum alloy or a molded product such as a resin product from the mold.

In fields such as die casting of aluminum alloys and injection molding of resin products, a cavity is formed with a fixed mold and a movable mold, and molten metal or molten resin is cast (injected) into the cavity, and then cooled and solidified. The formed product is released from the mold and taken out.
A typical mold release method is schematically shown in FIG.
As shown in FIG. 4A, the fixed mold 130 and the movable mold 131 are clamped, and molten metal or the like is injected (injected) into the cavity. As shown in FIG. It is attached and retracted via a rod 102 directly connected to this movable platen.
In this case with the difference of the mold draft such a fixed mold and a movable mold, the molded product W ₁ is still stuck to the movable die in many cases is designed to mold opening.
Therefore, the draft of the molded product is limited, and the degree of freedom of the shape of the molded product is suppressed.
Then as shown in (c), projecting an ejector pin 127 through the ejector plate 122 by advancing the ejector rod 123 in a cylinder or the like, mold the molded product W ₁ by projecting a molded product W ₁ Take out from.

However, there is a case where the molded product is not sufficiently solidified, or there is a case where the molded product is desired to be released from the mold in a high temperature state.
As schematically shown in FIGS. 5 (a) In this case, would be part of the molded product W ₁ when mold is opened the movable mold is pulled in the fixed die 130, the molded article shape is deformed Fear arises.
Further, the molded article W ₁ is stick directly to the movable die, there is a possibility that the direction in deformation of the molded article is depressed soften as shown in FIG. 5 (b) when projecting an ejector pin from the stationary die as to release It was.

Patent Document 1 discloses a method of reducing mold release resistance by projecting a plurality of ejector pins in stages, but the effect is limited, and deformation due to part of a molded product sticking to a fixed mold is prevented. Can not do it.
Patent Document 2 discloses a mold release method in which a fixed mold also has a functional structure equivalent to an ejector pin, but it cannot prevent protrusion deformation due to the ejector pin.
Patent Document 3 discloses a technique in which a momentary initial shock is not applied to a molded product by applying a mold opening pressure in a pulsed manner, but a complicated and expensive control facility is required.

JP 9-109198 A Japanese Patent Laid-Open No. 10-217294 Japanese Patent Laid-Open No. 9-1616

  An object of the present invention is to provide a molded product release apparatus and a molded product release method that are effective in suppressing deformation of a molded product when the molded product is released from a mold and have a simple structure.

In the molded product release device according to the present invention, a fixed base plate and a fixed plate are connected by a tie bar, and the movable plate advances along the tie bar by forward / backward control of a main rod provided on the base plate.・ It moves backwards and is equipped with a fixed type fixed directly to the fixed platen or via a fixed type mounting base part and a movable type fixed to the movable platen directly or via a movable type mounting base part. The fixed mold has a fixed mold ejector pin that supports the molded product and a fixed mold side push pin that protrudes in the movable mold direction, and the movable mold has a movable mold ejector pin that supports the molded product and the movable mold side that protrudes in the fixed mold direction. It has embossed pins, movable platen is only forward and backward movably slide support a predetermined distance by an auxiliary rod which is connected to the main rod, have and be freely abutting and predetermined distance with respect to the main rod It is characterized in.
Here, since the movable plate is connected to the main rod so as to be in contact with and separated from the predetermined distance, when the main rod moves forward, the movable plate is pushed forward by pressing the movable plate from the rear, When the main rod moves backward, only the main rod moves backward until a predetermined interval is reached, and thereafter the movable plate moves backward so as to be pulled by the main rod.
In addition, when there is a gap between the movable platen and the main rod, the movable plate can be moved backward until it comes into contact with the main rod.

In the present invention, the fixed mold ejector pin and the fixed mold side mold push pin are controlled to move forward and backward by a single fixed mold ejector plate provided in the fixed mold or in the fixed mold mounting base. When the ejector pin and the movable mold side push pin are controlled to move forward and backward by one movable ejector plate provided in the movable mold or the movable mold mounting base, the ejector pin and the mold push pin are synchronized. Can be moved forward and backward.
Here, the fixed mold and the movable ejector plate may be directly disposed in the fixed mold and the movable mold, respectively, but if the mold is divided into the mold and the mounting base, the mold can be downsized.

The mold release method using such an apparatus includes a step of molding a molded product in a state where the fixed mold and the movable mold are clamped, and the main rod is retracted between the movable platen and the main rod. A step of forming a predetermined interval, a step of retreating the movable mold by projecting the fixed mold side pressing pin while supporting the molded article with the fixed mold ejector pin, and simultaneously releasing the molded article from the fixed mold, Furthermore, the movable die side push pin protrudes while supporting the molded product with the movable ejector pin, so that the movable die is relatively retracted, and the molded product is released from the movable die. To do.
If the movable plate is directly fixed to the main rod, the fixed plate fixed directly to the fixed plate or through the fixed mounting base portion, and the fixed plate fixed to the movable plate directly or through the movable mounting base portion. The fixed mold has a fixed mold ejector pin that supports the molded product and a fixed mold side push pin that protrudes in the movable mold direction, and the movable mold has a movable ejector pin that supports the molded product and has a movable mold side mold push pin projecting into fixed direction, a step of molding a molded article in a state where the fixed mold and the movable mold and clamping, while supporting the molded article fixed ejector pin, the fixed A step of releasing the molded product from the fixed mold by projecting the fixed mold side pressing pin while the movable mold is moved backward synchronously so that the protrusion amount of the mold ejector pin and the movable mold retraction amount are synchronized ; Furthermore, with movable ejector pins While supporting the shaped piece, while synchronously retracting the movable die so that the amount of retreat of the protrusion amount and the movable mold of the movable die ejector pin is synchronized moldings by protruding the movable mold side mold push pins And a step of releasing from the movable mold.

  In the molded product release apparatus according to the present invention, the mold is clamped, and after molding the molded product, only the main rod is retracted by a predetermined distance, and fixed by leaving a predetermined interval between the main rod and the movable mold. While supporting the molded product with the mold ejector pin, the movable mold can be moved backward by protruding the fixed mold side push pin from the fixed mold, and the molded product is released from the fixed mold relatively and molded as before It is not necessary to force the product to a movable mold with a draft or the like, and it is possible to reduce the occurrence of deformation force on the molded product.

  In addition, the movable die and the main rod may be directly fixedly connected, and the retraction of the movable die may be synchronized with the movement of the die pressing pin. In addition, since the movable mold opening is performed by the mold pressing pin protruding from the fixed mold, the shock at the initial stage of mold opening is small, and the movement of the ejector pin and the mold pressing pin can be easily synchronized.

Even when the molded product is released from the movable mold, the movable mold side push pin is abutted against the fixed mold side mold push pin with a predetermined space between the movable mold and the main rod. By projecting, the movable mold retreats relatively while supporting the molded article with the movable ejector pin, and the molded article is pushed out with the movable ejector pin in synchronization with it, so the movable mold is suppressed while suppressing the impact on the molded article. Can also be released from.
Thereby, even if it is a soft molded article, it can release, suppressing a deformation | transformation.

The structural example of the molded product release apparatus which concerns on this invention is shown, (a) is a principal part figure of the whole, (b) shows the principal part figure of metal mold | die vicinity. Explanatory drawing of opening and closing of a metal mold | die is shown. The mold release procedure of the molded product is shown. A conventional mold release method will be described. Explanatory drawing of the problem in case a molded article is soft is shown.

Hereinafter, a structural example and a mold release method example of a molded product release apparatus according to the present invention will be described with reference to the drawings.
The principal part figure is shown in FIG.
A fixed plate 10 is arranged at a predetermined distance from the fixed base plate 1, and a tie bar 4 is provided therebetween, and the movable plate moves forward and backward along the tie bar 4.
In this specification, the movement in the mold clamping direction is expressed as forward, and the movement in the mold opening direction is expressed as backward.

The fixed platen 10 has a fixed mold mounting base portion 11 in which a fixed mold ejector plate 12 is disposed in an inside 11 a, and a fixed mold 30 is mounted on the fixed mold mounting base portion 11.
The fixed ejector plate 12 is controlled to move forward and backward by a fixed ejector rod 13 hydraulically controlled by a cylinder 14.
The fixed ejector plate may be provided directly in the fixed mold.
The fixed mold ejector plate 12 penetrates the fixed mold 30 and protrudes toward the movable mold 31, and the fixed mold side mold push pin 16 protrudes in accordance with the movement of the fixed mold side mold push pin 16 to project the molded product. A fixed ejector pin 17 to be supported is provided in the horizontal direction.
Therefore, the fixed mold side push pin 16 and the fixed mold ejector pin 17 are arranged in parallel to each other, and are moved forward or backward synchronously by the advance / retreat of the fixed mold ejector plate 12.

The movable platen 20 has a movable mounting base portion 21 having a movable ejector plate 22 provided inside 21 a on the fixed mold side, and a movable die 31 is mounted on the movable mounting base portion 21.
The movable ejector plate 22 is controlled to move forward and backward by a movable ejector rod 23 hydraulically controlled by a cylinder 24.
The movable ejector plate may be disposed directly in the movable mold without providing the movable mold mounting base.
From the movable ejector plate 22, the movable mold 31 penetrates through the movable mold 31 and abuts against the fixed mold side mold push pin 16 of the fixed mold 30, and the movement of the movable mold side mold push pin 26 is matched. A movable ejector pin 27 that supports the molded product by projecting toward the cavity 32 is provided.
Accordingly, the movable side mold push pin 26 and the movable ejector pin 27 are also moved forward or backward in synchronization with each other in parallel.
Further, since the movable mold side push pin 26 is in a state of being abutted against the fixed mold side mold push pin 16 of the fixed mold 30, when the movable mold side mold push pin 26 is projected toward the fixed mold, it is fixed. Since the mold does not move, a force acts in the direction in which the movable mold moves backward.

The movable platen 20 has a horizontal slide hole 28, an auxiliary rod 3 that moves forward and backward along the slide hole 28 is disposed, and the rear end of the auxiliary rod 3 is fixedly connected to the main rod 2. The tip of the auxiliary rod 3 has a head portion 3 a having a larger outer shape than the rod portion, and a step-shaped hooking portion 28 a smaller than the inner diameter of the slide hole 28 is provided on the main rod 2 side of the slide hole 28.
As a result, when the main rod 2 moves backward, the head 3 a of the auxiliary rod 3 interferes with the hooking portion 28 a of the slide hole 28 of the movable platen 20, and the auxiliary rod 3 pulls the movable platen 20 backward. Will do.
Further, when the head 3 a of the auxiliary rod 3 is positioned at the hooking portion 28 a of the slide hole 28, there is a predetermined interval between the rear surface of the movable platen and the front surface of the main rod 2, and the stroke portion having this interval. Only the movable board is movable backward.
The main rod 2 is forward / backward controlled by hydraulic control or the like.
The main rod 2 is not limited to a hydraulic type as long as the forward / reverse control is performed.

Next, the opening / closing operation of the mold will be described with reference to FIG.
FIG. 2A shows a state in which the movable die 31 is fully opened with respect to the fixed die 30, and when the main rod 2 moves backward, the movable plate 20 operates so as to be pulled by the head 3a of the auxiliary rod 3. There is a space of dimension d ₁ between the rear surface of the panel 20 and the front surface of the main rod 2.
When clamping the mold, the main rod 2 moves forward and the head 3a of the auxiliary rod 3 moves forward along the slide hole 28 (arrow S ₁ ).
When the main rod 2 moves forward by the distance d _1, the front surface of the main rod 2 hits the rear surface of the movable platen 20.
Thereafter, the movable platen 20 moves forward with the pressing force f ₁ (arrow S ₂ ), and thereby the movable die 31 moves forward.
As shown in FIG. 2 (c), when the movable mold 31 hits the fixed mold 30, the mold is clamped by the pressing force f ₂ of the main rod 2.
In this state, a material is injected or pressed into the mold (cavity 32) and molded.
When the mold opening the main rod 2 is retracted in the direction of S _3, it retracts the movable plate 20 in the direction of S ₄ with a force of f ₃ after the spacing d ₂ generated between the movable platen 20, The mold opens.

Next, a mold release procedure will be described with reference to FIG.
Figure 3 molded article while clamping a force of f ₂ of the main rod 2 as shown in (a) is produced.
For example, when a complex product is molded with an aluminum alloy at a high mold temperature, the temperature of the molded product is high and the product is in a soft state.
Then the main rod 2 as shown in (b) is retracted by P _1, causing the distance d ₂ between the movable platen 20.
In this state, the movable mold 31 and the fixed mold 30 are still closed.
Then the fixed ejector plate 12 as shown in (c) in a fixed-type ejector rod 13 is advanced in the direction of P _2.
Then, the movable mold 31 is retracted by the protrusion of the fixed mold side pressing pin 16, but the fixed mold ejector pin 17 protrudes synchronously, so that the molded product is supported by the fixed mold ejector pin 17, and the relative Thus, the mold is released so that the fixed mold 30 moves backward.
Then the main rod 2 as shown in (d) is further retracted in the direction of P ₃ by a distance d _3, it is advanced by the movable mold side mold push pin 26 is synchronized with the movable mold ejector pin 27 in this state, The movable mold 31 is relatively retracted, and the molded product is released from the movable mold 31 while being supported by the movable ejector pin 27.
At this time, the molded product W is grasped and carried out by a robot or the like.
Such a mold release method is also possible by directly connecting the movable platen 20 to the main rod 2 and performing a backward control in synchronization with the protruding operation of the fixed mold side push pin and the protruding operation of the movable mold side mold push pin. However, the hydraulic control or electric control of the main rod 2 is complicated.

DESCRIPTION OF SYMBOLS 1 Base board 2 Main rod 3 Auxiliary rod 10 Fixed board 11 Fixed type mounting base part 12 Fixed type ejector plate 13 Fixed type ejector rod 16 Fixed type side type push pin 17 Fixed type ejector pin 20 Movable board 21 Movable type mounting base part 22 Movable ejector plate 23 Movable ejector rod 26 Movable mold side push pin 27 Movable ejector pin 28 Slide hole 30 Fixed mold 31 Movable mold 32 Cavity

Claims (4)

The fixed base and the fixed base are connected with a tie bar, and the movable base moves forward and backward along the tie bar by the forward / backward control of the main rod provided on the base base. A fixed mold fixed directly or via a fixed mold mounting base, and
It is equipped with a movable mold that is fixed to the movable plate directly or via a movable mold mounting base part,
The fixed mold has a fixed mold ejector pin that supports the molded product and a fixed mold side mold push pin that protrudes in the movable mold direction.
The movable mold has a movable ejector pin that supports the molded product and a movable mold side push pin that protrudes in the fixed mold direction.
Movable platen is only forward and backward movably slide support a predetermined distance by an auxiliary rod which is connected to the main rod, and molded articles, characterized in that said has freely contact and a predetermined distance away from the main rod Release device.   The fixed-type ejector pin and the fixed-type side mold push pin are controlled to move forward and backward by a single fixed-type ejector plate provided in the fixed mold or in the fixed mold mounting base, and the movable type ejector pin and the movable mold-side mold push pin are controlled. 2. The molded product release apparatus according to claim 1, wherein the pin is controlled to move forward and backward by a single movable ejector plate provided in the movable mold or the movable mold mounting base. Using the molded product release apparatus according to claim 1 or 2,
Forming a molded product in a state where the fixed mold and the movable mold are clamped;
Retreating the main rod to form a predetermined interval between the movable platen and the main rod;
A step of retreating the movable mold by projecting the fixed mold side push pin while supporting the molded article with the fixed mold ejector pin, and simultaneously releasing the molded article from the fixed mold;
Furthermore, the movable die side push pin protrudes while supporting the molded product with the movable ejector pin, so that the movable die is relatively retracted, and the molded product is released from the movable die. To release the molded product. A fixed mold fixed to the fixed plate directly or via a fixed mold mounting base;
It is equipped with a movable mold that is fixed to the movable plate directly or via a movable mold mounting base part,
The fixed mold has a fixed mold ejector pin that supports the molded product and a fixed mold side mold push pin that protrudes in the movable mold direction.
The movable mold has a movable ejector pin that supports the molded product and a movable mold side push pin that protrudes in the fixed mold direction.
Forming a molded product in a state where the fixed mold and the movable mold are clamped;
While supporting the molded product with the fixed mold ejector pin, the fixed mold side push pin is projected while the movable mold is moved back synchronously so that the protruding amount of the fixed mold ejector pin and the retracted amount of the movable mold are synchronized. A step of releasing the molded product from the fixed mold,
Further, while supporting the molded product with the movable ejector pin, the movable mold side push pin protrudes while the movable mold is moved backward synchronously so that the protruding amount of the movable ejector pin and the retracted amount of the movable mold are synchronized. And a step of releasing the molded product from the movable mold.

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