JP2005297470A - Mold assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold assembly having a nested structure with a high degree of freedom of replacement, wherein a nesting piece of a fixed mold and a nesting piece of a movable mold can be replaced with each other. <P>SOLUTION: This mold assembly comprises the fixed mold 1 and the movable mold 10, which are used for molding a thin plate-like product 23; the fixed mold 1 comprises a frame-like cavity frame 5 which is equipped with a protrusion 8, and one nesting piece 6 which is fitted and inserted into the inside of the cavity frame 5; and the movable mold 10 comprises a stripper plate 15 which is equipped with a recess 18 subject to the fitting-in of the protrusion 8, and the other nesting piece 16 which can be substituted for one nesting piece 6 by making a side surface slide on an inner hole surface 32 provided inside the recess 18. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mold apparatus capable of exchanging the nesting of a fixed mold and a movable mold with each other.

  As shown in Patent Document 1, the nesting structure in an injection mold includes a mold plate and a mold portion that is inserted and attached to a bottomed hole provided in the mold plate. Such inserts can be easily replaced with other ones so that they can cope with wear, damage, cavity shape changes, and the like.

  By the way, the groove pattern for circulating hydrogen, air, or cooling water provided on the front and back surfaces of the fuel cell separator, which is a thin plate product, is required to have various forms in order to improve the power generation efficiency of the fuel cell. The Therefore, the mold cavity for shaping the groove pattern of the separator is an effective example when a nested structure is applied.

Furthermore, the mold nesting structure for shaping the separator groove pattern is required to be interchangeable between the stationary mold nesting and the movable mold nesting. However, in the conventional mold, the movable mold insert is provided with a through hole for the protruding pin of the molded product, so the insert of the movable mold and the insert of the fixed mold have the same dimensions. It was difficult to exchange with each other.
Japanese Patent Laid-Open No. 9-1599 (pages 1 to 3, FIGS. 1 to 3)

  The present invention has been made in order to solve the above-described problem, and a mold having a nested structure with a very high degree of freedom of exchange, in which a fixed mold and a movable mold can be interchanged with each other. An object is to provide an apparatus.

The present invention is a mold apparatus comprising a stationary mold and a movable mold for molding a thin plate product,
The fixed mold has a frame-like cavity frame having a convex part and one nesting inserted into the cavity frame, and the movable mold has a concave part into which the convex part is fitted. The present invention relates to a mold apparatus having a plate and another insert which can be exchanged with the one insert by sliding on the inner hole surface provided inside the recess.

  According to the mold device of the nested structure of the present invention, the replacement of the nested structure can be performed with a very high degree of freedom.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a mold apparatus having a nesting structure according to the present invention. FIG. 2 is a cross-sectional view showing an example of a molded product molded by the mold apparatus shown in FIG.

  The mold apparatus is composed of a fixed mold 1 and a movable mold 10, and when both are matched, a cavity is formed between them.

  The fixed mold 1 includes a fixed mounting plate 2 attached to a mold clamping device of an injection molding machine (not shown), a fixed mold plate 3 fixed to the fixed mounting plate 2, and a central opening of the fixed mounting plate 2 and the fixed mold plate 3. The sprue bush 4 that is inserted into the fixed mold plate 3 and fixed to the fixed mold platen 3, and the concave mold 29 that is fitted into the contact surface 28 of the fixed mold 1 that contacts the contact surface 30 of the movable mold 10. A frame-shaped cavity frame 5 fixed to the board 3 and a nesting 6 fitted and fixed to the fixed mold board 3 by being inserted inside the cavity frame 5 and outside the sprue bush 4. A convex portion 8 that protrudes from the same height as the contact surface 28 is provided inside the end surface of the cavity frame 5 on the movable mold 10 side. The end surface of the convex portion 8 and the cavity surface 7 that is the end surface of the insert 6 have the same height.

  The movable mold 10 includes a movable mounting plate 11 attached to a mold clamping device of an injection molding machine (not shown), a movable mold plate 12 fixed to the movable mounting plate 11, and a fixed mold 1 of the movable mold plate 12. Fits into a guide pin 26 erected on the surface 27, a stripper plate 15 guided by the guide pin 26 and reciprocated by a predetermined distance from the opposing surface 27 by an ejector device of an injection molding machine, and a center hole of the movable mold platen 12. The eject pin bush 13 is inserted and guides the eject pin 14. The recess 31 is provided on the opposing surface 27. The insert 16 is fitted into the eject pin bush 13 and fixed to the movable mold 12. The stripper plate 15 has an inner hole surface 32 that slides on the side surface of the insert 16 at the center thereof, and a concave portion 18 provided on the contact surface 30 of the inner hole surface 32 on the outer periphery of the fixed mold 1 side. When the movable mold 10 approaches the fixed mold 1 by a mold clamping device of an injection molding machine (not shown), the guide pin 26 guides the convex portion 8 of the fixed mold 1 into the concave portion 18 and the cavity surface 7. A cavity is formed by the cavity surface 17 and the recess 18.

  The injection molding using this metal mold | die is demonstrated. After the molds are aligned as described above and the cavity is formed, the nozzle 9 of the injection device abuts against the end surface of the sprue bush 4 and is pressed. Then, the molten material is injected from the injection device, the molten material flows from the sprue bush 4 into the cavity, and the molded product 19 is formed. As shown in FIG. 2, the molded product 19 includes a sprue 20, a gate 21 that narrows the sprue 20 in a direction perpendicular to the sprue 20 and guides the molten material, and a thin plate-like product 23 provided one or more at the front of the gate 21. And an undercut portion 22 provided to extend to the sprue 20. The product 23 has a transfer surface 24 formed by the cavity surface 7 and a transfer surface 25 formed by the cavity surface 17.

  When the molded product 19 is solidified in the cavity, the movable mold 10 is separated from the fixed mold 1. At this time, since the undercut portion 22 is engaged with the eject pin bush 13 by the undercut, the molded product 19 moves on the cavity surface 17 of the movable mold 10. When the movable mold 10 moves by a predetermined distance according to the molded product 19, the ejector device of the injection molding machine is driven to advance the stripper plate 15 and the eject pin 14. As a result, the molded product 19 is pushed by the bottom surface of the recess 18 of the stripper plate 15 and the tip surface of the eject pin 14 and is released from the cavity surface 17 and taken out.

  When the transfer surface 24 and the transfer surface 25 are interchanged with each other, or when the transfer surface 24 has another shape, the insert 6 and / or the insert 16 must be attached and detached. Therefore, the insert 6 and the insert 16 have the same shape and size except for the cavity surface 7 and the cavity surface 17. That is, the inner surface of the cavity frame 5 of the fixed mold 1 has the same shape and size as that of the concave mold 31 and the inner hole surface 32 of the movable mold 10. Further, the diameter of the sprue bush 4 of the fixed mold 1 is the same as the diameter of the eject pin bush 13 of the movable mold 10.

  The eject pin bush 13 of the movable mold 10 is not essential and can be omitted when the molded product 19 is projected by air or the like. In that case, the movable die 10 is provided with a member having the same diameter instead of the eject pin bush 13, or a member that closes it is inserted into the central hole of the insert 16.

    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.

It is a cross-sectional view of a mold apparatus having a nesting structure of the present invention. It is sectional drawing which shows the example of the molded article shape | molded by the metal mold | die apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed mold 2 Fixed mounting plate 3 Fixed mold board 4 Sprue bush 5 Cavity frame 6,16 Nesting 7,17 Cavity surface 8 Convex part 9 Nozzle 10 Movable metal mold 11 Movable mounting board 12 Movable mold board 13 Eject pin bush 14 Eject Pin 15 Stripper plate 18, 29, 31 Recessed part 19 Molded product 20 Sprue 21 Gate 22 Undercut part 23 Product 24, 25 Transfer surface 26 Guide pin 27 Opposing surface 28, 30 Contact surface 32 Inner hole surface

Claims (2)

A mold apparatus comprising a fixed mold and a movable mold for molding a thin plate product,
The fixed mold has a frame-like cavity frame provided with a convex portion, and one nesting that is inserted inside the cavity frame,
The movable mold has a stripper plate having a recess into which the convex portion is fitted, and another insert that can be exchanged for the one insert by sliding a side surface on the inner hole surface provided inside the recess. Mold device characterized by.   The mold apparatus according to claim 1, wherein the movable mold has an eject pin bush having the same diameter as the sprue bush of the fixed mold.

Images