JP2006231642A - Take out method for molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a take out method for a sheet-shaped molding from a mold without cracking or deforming the molding. <P>SOLUTION: In the method for taking out the sheet-shaped molding M molded in the mold 1 from the mold 1, after or during the solidification of the molding M in the cavity C of the mold 1, a movable mold 2 is opened in a prescribed quantity D and positioned, an ejector pin 4 is moved in a distance which is smaller than a quantity corresponding to the prescribed quantity D, pressurized air is introduced into a space formed by pushing the molding M by the ejector pin 4, and then the ejector pin 4 is moved further to eject the molding M. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for taking out a thin plate-shaped molded product from a mold.

  For example, when a fuel cell carbon separator is molded by injection molding or compression molding as a thin plate-shaped molded product, in order to take out the molded product from the mold, it protrudes with an ejector pin or stripper plate, or assists air blowing. I used it. However, since the carbon separator is fragile and has a thin plate thickness of 1 to 1.5 mm, the carbon separator protrudes at the time of release and causes cracks and deformation in the local part of the molded product due to the corners of the member. When such a crack or deformation occurs in the separator, gas leakage or the like occurs when the separator is laminated to form a fuel cell, and the separator does not function as a fuel cell.

  Patent Document 1 is disclosed as a technique for solving the problem in taking out such a thin plate-shaped molded product from a mold. In Patent Document 1, one of a pair of fitting molds is provided with means for opening and closing the mold in the axial direction and mechanical contact means for limiting the amount of the opening and closing, and further forming irregularities on the molded product A mold having a means for holding a thin plate and means for blowing air from the surface of a molded product that forms at least irregularities is used, and is temporarily stopped when the mold is opened to form at least irregularities. Air is blown out from the surface of the molded product.

However, Patent Document 1 relates to a mold for an optical disk substrate having a stamper, and even if it is a thin plate, it is difficult to apply it to molding carbon separators having different rigidity and the like.
JP 2000-108169 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for taking out a thin plate-shaped product from a mold without cracking or deformation.

  The present invention is a method of taking out a thin plate-shaped molded product molded with a mold from the mold, and after the molded product is solidified in the mold cavity or during solidification, the movable mold is opened and positioned by a predetermined amount, and the movable Move the ejector by an amount corresponding to or less than the predetermined amount with the mold open, blow the compressed air into the space formed by the ejector pushing the molded product, and then move the ejector further to form the molded product The present invention relates to a method for taking out a molded product that protrudes.

  According to the method for taking out a molded product of the present invention, a thin plate-like molded product can be taken out from a mold without cracking or deformation.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part showing a state in which a mold for executing a molded product removing method of the present invention is opened by a predetermined amount and an ejector is advanced. FIG. 2 is a cross-sectional view of the main part showing a state in which pressurized air is supplied to a mold for executing the molded product removing method of the present invention. FIG. 3 is a cross-sectional view of an essential part showing a state in which a molded product of a mold for executing the molded product removal method of the present invention is protruded.

  The mold 1 includes a movable mold 2 and a fixed mold 3. The movable die 2 is attached to a movable platen of a molding machine (not shown) and is provided so as to be able to approach, separate from, and press-fit the fixed die 3. The stationary mold 3 is attached to a stationary platen of a molding machine (not shown). When the convex part of the fixed mold 3 is fitted into the concave part of the movable mold 2 and the molds are aligned with each other, a cavity C having a variable volume is formed.

  An ejector pin 4 is provided on the bottom surface of the concave portion of the movable die 2 so that the tip end surface of the ejector pin 4 can protrude from the surface of the cavity C by a driving device (not shown). The ejector pin 4 is a round bar whose tip 5 forms an inverted cone, and slides in a perforation provided in the movable die 2. On the inner peripheral surface of the perforation, a groove-shaped air passage 6 for introducing pressure air is provided. The air passage 6 is configured to communicate with the cavity C through the air outlet 7 when the ejector pin 4 protrudes into the cavity C.

  Next, molding by the mold 1 and a method for taking out the molded product M will be described. In the compression molding method, a powdery or molten molding material is supplied to the opened cavity C by other means, and is compressed by the movable mold 2 and the stationary mold 3 to mold the molded product M. Further, in the case of an injection molding method, a sprue hole (not shown) is provided in the mold 1 and a molten molding material is injected from a not-shown injection device into a cavity C communicating with the mold 1, and a compression operation is added if necessary. Molded product M is molded.

  The molding material in a molten state in the cavity C is cooled and solidified to become a molded product M. After completion of solidification or during solidification, the movable mold 2 is opened by a predetermined amount D and is positioned and held at that position. At this time, since the molded product M adheres more strongly to the movable mold 2 side, the fixed mold 3 side is released. Therefore, a gap D is generated between the molded product M and the convex surface of the fixed mold 3. The predetermined amount D is appropriately set in the range of 0.1 to 5 mm according to the thickness of the carbon separator, its material, and the form of the ejector.

  Next, as shown in FIG. 1, the ejector pin 4 is moved forward by an amount corresponding to the gap D or a distance less than that, and pressurized air is supplied to the air passage 6 so that the ejector pin 4 pushes the molded product M. Blowing pressure air into the space. The molded product M is released from the surface of the cavity C of the movable mold 2 by the pressure air, pressed against the surface of the cavity C of the fixed mold 3 and molded flatly, and sufficiently cooled and solidified (FIG. 2). In addition, it can also be comprised so that it may act similarly even if it uses a stripper plate etc. instead of the ejector pin 4. FIG.

  Then, as shown in FIG. 3, after the movable mold 2 is separated from the fixed mold 3 by a sufficient distance, the ejector pins 4 are further ejected, and the molded product is ejected from the movable mold 2 by blowing out pressure air as necessary. .

  The present invention is not limited to the embodiments described above, and various modifications can be added and implemented without departing from the spirit of the invention. For example, a compression mold may not have an ejector. In that case, when the movable mold is opened by a predetermined amount D and positioned, all or part of the members constituting the cavity on which the molded product M is not released is formed of a breathable member such as sintered metal, and from there After pressure air is blown out and release and shaping are performed in the same manner as described above, ejection is performed only with pressure air. In addition, when high-pressure air is required as in this case, it is preferable to use a pressure intensifier composed of a cylinder with a different diameter.

It is principal part sectional drawing which shows the state which opened the metal mold | die which performs the molded article taking-out method of this invention predetermined amount, and advanced the ejector. It is principal part sectional drawing which shows the state which supplied the pressure air to the metal mold | die which performs the molded article taking-out method of this invention. It is principal part sectional drawing which shows the state which protruded the molded product of the metal mold | die which performs the molded product taking-out method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Movable type 3 Fixed type 4 Ejector pin 5 Tip part 6 Air passage 7 Air outlet C Cavity D Gap M Molded product

Claims (3)

A method of taking out a thin plate-shaped molded product molded from a mold from the mold,
After the molded product is solidified in the mold cavity or during solidification, the movable mold is opened and positioned by a predetermined amount, and after the pressurized air is blown out from the mold on the side where the molded product has not been released, the mold is opened. And then ejecting the molded product by blowing out the compressed air and ejecting the molded product. A method of taking out a thin plate-shaped molded product molded from a mold from the mold,
After the molded product is solidified in the mold cavity or during solidification, the movable die is opened and positioned by a predetermined amount, and the distance ejector corresponding to the predetermined amount opened by the movable die or less is moved, and A method for taking out a molded product, comprising: ejecting pressurized air into a space formed by an ejector pressing the molded product; and then further moving the ejector to eject the molded product.   The method for taking out a molded product according to claim 1 or 2, wherein the predetermined amount of the movable mold opened and positioned is 0.1 mm to 5 mm.

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