JP2002046155A - Stack mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stack mold which is simple in attachment/detachment, has a hot sprue which is applicable alternately to molds having cavities of substantially the same shape, and is small in load during mold opening/closing. SOLUTION: In the stack mold in which a fixed side template 12, a movable side template 14, and an intermediate template 13 are provided, during mold clamping, cavities 15 of a shape corresponding to a molding to be molded are formed independently between the templates 12 and 13 and between the templates 13 and 14 respectively, in the fixed side template 12, a communication hole 121 is formed at a non-overlapping position when the cavities 15 and 15 are projected on a surface crossing the moving direction of the mold perpendicularly, the hot sprue 1 is inserted freely attachably/detachably into the hole 121, one end of the hot sprue 1 is connected to a nozzle touch fitted to a fixed side mounting plate 122, and the other end of the hot sprue 1 is connected to a manifold 16 fitted to the intermediate template 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stack mold used for an injection molding machine for resin products.

[0002]

2. Description of the Related Art Conventionally, when a resin molded product having a small thickness is manufactured by injection molding, in order to improve productivity by mass-producing while reducing the installation area of a molding die, etc. Stack dies are used.

In this stack mold, for example, as shown in FIG. 5, an intermediate mold plate 13 is disposed between a fixed mold plate 12 and a movable mold plate 14, and the fixed mold plate 12 and the intermediate mold plate 13 are arranged. Between
A cavity 15 having a shape corresponding to a molded product to be molded is provided between the intermediate mold plate 13 and the movable mold 14 [“Theory and Practice of Injection Mold Design and Production” (Nippon Plastic Processing Co., Ltd.). Technical Association) page 124].

In order to obtain a molded product using this mold, a resin is injected into the manifold 16 from the locate ring 30 via the hot sprue 1 from an injection molding machine (not shown), so that the resin is injected into each cavity 15. Inject resin. Then, the resin injected into each cavity 15 is released by protruding the protruding plate 18.

When there is a cavity near the center of the fixed mold plate, as shown in FIG. 6, a hot sprue 10 is provided from the locate ring 30 so as to bypass the position of the cavity 15, and the fixed mold plate 12 is mounted. It is common to penetrate and connect to the manifold 16 in the intermediate mold plate 13 (parts substantially equivalent to those in FIG. 5 are denoted by the same reference numerals and description thereof is omitted. ing).

In this case, when the mold is opened, the fixed side mold plate 12 is opened.
The hot sprue 10 is divided so as to be separated from the inner or fixed side mold plate 12 and the fixed side mounting plate.

[0007]

However, in this structure, 1) In repairing the hot sprue, the fixed side mold plate must be removed from the fixed side mounting plate and disassembled each time, thereby increasing the number of steps. .

2) When a plurality of molds are manufactured, a hot sprue must be manufactured for each mold, which complicates the structure and increases the cost. For example, a case in which only the design of a product is different even though the external dimensions are the same, and a hot sprue must be separately manufactured in spite of the fact that a molding machine can be shared.

3) Since the hot sprue is divided in the fixed mold plate or between the fixed mold plate and the fixed mounting plate,
The weight of the intermediate mold plate increases, the workability of attaching the mold to the molding machine is poor, and the load at the time of opening and closing the mold is large, so that a failure is likely to occur. And so on.

The present invention solves the above-mentioned problems, has a hot sprue which can be easily attached and detached, and which can be used interchangeably between dies having cavities of substantially the same shape, so that the load during opening and closing operations of the dies can be reduced. It is intended to provide a small stack mold.

[0011]

A stack mold according to the present invention comprises a fixed mold plate, a movable mold plate, and an intermediate mold plate.
At the time of mold clamping, a stack metal in which one cavity having a shape corresponding to a molded product to be molded between the fixed mold plate and the intermediate mold plate and between the intermediate mold plate and the movable mold plate is formed independently. The fixed side mold plate is provided with a communication hole at a position that does not overlap when each of the cavities is projected onto a plane orthogonal to the direction of movement of the mold, and a hot sprue is removably fitted into the communication hole. One end of the hot sprue is connected to a nozzle touch provided on the fixed side mounting plate, and the other end of the hot sprue is connected to a manifold provided on the intermediate mold plate.

(Operation) The stack mold of the present invention includes a fixed mold plate, a movable mold plate, and an intermediate mold plate, and when the mold is clamped, the fixed mold plate, the intermediate mold plate, and the intermediate mold plate. A mold having a shape corresponding to a molded product to be molded between the movable mold and the movable mold, and a stack mold in which one cavity is independently formed. A communication hole is provided at a position that does not overlap when projected on a plane perpendicular to the direction of movement of the hot sprue, and a hot sprue is removably fitted into the communication hole, so that the hot sprue can be easily removed from the mold. It is easy to assemble and disassemble, and can be shared with other molds.

Further, one end of the hot sprue is connected to a nozzle touch provided on the fixed side mounting plate, and the other end of the hot sprue is provided on the intermediate mold plate and connects the resin flow path to a hot runner connected to each cavity. Since it is connected to the manifold to be divided, the weight of the intermediate mold plate is small, the workability when attaching the mold to the molding machine is good, and the load at the time of opening and closing the mold is small, and the failure Less likely to occur.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a simplified sectional view showing an example of a stack mold according to the present invention. In FIG. 1, 1 is a hot sprue,
11 is a nozzle touch, 12 is a fixed mold, 13 is an intermediate mold, 14 is a movable mold, 15 is a cavity, and 16 is a manifold.

As shown in FIG. 1, the stack mold of the present invention comprises a fixed mold plate 12, a movable mold plate 14, and an intermediate mold plate 1.
3 and the fixed template 12 and the intermediate template 1 at the time of mold clamping.
3, and cavities 15, 15 having a shape corresponding to a molded product to be molded between the intermediate mold plate 13 and the movable mold plate 14,
At least one each of them is formed independently.

Each of the cavities 1 is fixed to the fixed mold plate 12.
The communication holes 121 are provided at positions where they do not overlap when the projections 5 and 15 are projected onto a plane orthogonal to the direction of movement of the mold.
The hot sprue 1 is detachably fitted to 21, one end of the hot sprue 1 is connected to the nozzle touch 11 provided on the fixed side mounting plate 122, and the other end of the hot sprue 1 is
The resin flow path is provided in the intermediate mold plate 13 so that each cavity 1
It is connected to a manifold 16 which is divided into hot runners 17, 17 connected to 5, 15.

When the fixed side mold plate 12 and the intermediate mold plate 13 are divided at the dividing surface 19 when the mold is opened,
It is configured to be divided at the joint between the hot sprue 1 and the manifold 16.

In the stack mold of the present invention, the fixed mounting plate 122 is provided on a fixed platen of an injection molding machine (not shown), and the movable mounting plate 142 is provided on a movable platen of an injection molding machine (not shown). The fixed-side platen and the movable-side platen are integrally moved.

FIG. 2 is a sectional view showing an example of a hot sprue used for the stack mold of the present invention, and FIG.
FIG. 4 is a side view of FIG. 2 viewed from the Y direction. As shown in FIGS. 2 to 4, the hot sprue 1 includes a nozzle touch sprue 1a, a bypass sprue 1b, an extended sprue 1c, and a sprue nozzle 1d, and a resin flow path 6 is formed in this order from the nozzle touch 11. .

Nozzle touch sprue 1a to extension sprue 1c
Includes a ring heater 1e and a cartridge heater 1f.
(FIG. 4) is attached. Also, detour sprue 1b
Is attached to the base plate 2 by bolts 5 with the heat insulating material 4 interposed therebetween. The base plate 2 is provided with a locate ring 3 so that the center of the nozzle touch sprue 1 a can be aligned with the nozzle touch 11. It has been done. Then, the base plate 2 is attached so that the side surface 2a is along the side surface of the fixed mold plate 12, and the hot sprue 1 is fitted into the communication hole 121 (FIG. 1).

The material of the hot sprue 1 is not particularly limited and varies depending on the resin used. For example, when a vinyl chloride resin is used as the resin, a stainless steel plate is preferable, and the base plate 2 Since carbon steel such as ordinary S55C and a heat insulating material need to have rigidity enough to fix the hot sprue 1, a titanium alloy or the like is preferable.

[0023]

Since the stack mold of the present invention is constructed as described above, it has a hot sprue which can be easily attached and detached and can be used interchangeably between molds having cavities of substantially the same shape. However, the load at the time of opening and closing the mold is reduced.

[Brief description of the drawings]

FIG. 1 is a simplified sectional view showing an example of a stack mold of the present invention.

FIG. 2 is a cross-sectional view showing an example of a hot sprue used for a stack mold of the present invention.

FIG. 3 is a plan view of FIG. 2 viewed from an X direction.

FIG. 4 is a side view of FIG. 2 viewed from a Y direction. It is sectional drawing.

FIG. 5 is a simplified sectional view showing an example of a conventional stack mold.

FIG. 6 is a simplified sectional view showing another example of a conventional stack mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stack mold 12 Fixed side mold plate 121 Communication hole 122 Fixed side attachment plate 13 Intermediate plate 14 Movable side mold plate 142 Movable side attachment plate 15 Cavity 16 Manifold 17 Hot runner

Claims (1)

[Claims] 1. A fixed mold plate, a movable mold plate, and an intermediate mold plate, wherein a fixed mold plate, an intermediate mold plate, and an intermediate mold plate and a movable mold plate are provided during mold clamping. When the cavities having the shapes corresponding to the molded articles to be molded are independently formed stack dies, and the above-mentioned cavities are projected on a surface orthogonal to the moving direction of the mold on the fixed mold plate. A communication hole is provided at a position that does not overlap with, a hot sprue is detachably fitted to the communication hole, one end of the hot sprue is connected to a nozzle touch provided on the fixed side mounting plate, and the other end of the hot sprue is A stack mold connected to a manifold provided on an intermediate mold plate.