JPH069813Y2 - Molten resin supply device in molten resin pressure molding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a molten resin supply device in a molten resin pressure molding device, and its purpose is to prevent thermal expansion and contraction of a molten resin supply pipe base formed of a base pipe. A molten resin supply device in a molten resin pressure molding device capable of supplying a molten resin satisfactorily without displacement of the manifold hold pipe with respect to the gate pipe and easily adjusting the supply flow rate of the molten resin. Is intended to provide.

(Background of the Invention) Synthetic resin molded products are used in large quantities in various fields including automobiles and home appliances because of their economical efficiency, free shapeability and light weight.

On the other hand, these synthetic resin molded products tend to be large-scale products.

Although these synthetic resin molded products were manufactured by injection molding, a method of molding by a molten resin pressure molding device equipped with a mold device having an upper mold and a lower mold created by the inventors is also adopted. Is starting to appear.

In this molten resin pressure molding device, a gate pipe is connected to a manifold hold pipe, a gate pin is distributed in the gate pipe, and the gate pin provided at a predetermined position of the mold is opened and closed by the gate pin. When the gate pin is disengaged from the gate port, the molten resin fed from the molten resin supply pipe base through the many hold pipe into the gate pipe is supplied from the gate port into the mold device consisting of the upper mold and the lower mold. A synthetic resin molded product is obtained by pressure molding.

(Prior Art) A molten resin supply device in a conventional molten resin pressure molding device is configured such that a plurality of many hold pipes are connected in parallel with each other in a molten resin supply pipe base formed of one base pipe, The molten resin is fed from the base portion of the molten resin supply pipe to the manifold hold pipe, and the molten resin is fed from the manifold hold pipe to a gate pipe connected to and continuous with the manifold hold pipe, and a gate port provided on the tip side of the gate pipe The molten resin was supplied into the mold device.

(Problem to be Solved by the Invention) In the above-mentioned conventional molten resin pressure molding apparatus, since a plurality of many-hold pipes are connected in parallel with each other in the molten resin supply pipe base portion composed of one base pipe,
When thermal expansion and contraction occur in the molten resin supply pipe base, the positions of the many-hold pipes, especially the positions of the many-hold pipes located at both longitudinal ends of the molten resin supply pipe base are displaced, and the many-hold pipe and the gate pipe are displaced. There has been a problem that the connection state with and the like deteriorate, and a harmful effect such as leakage of the molten resin occurs.

Further, if a load is applied to the gate pipe from above, there is a problem that the connecting portion between the manifold pipe and the base pipe connected to the gate pipe may be damaged.

Therefore, in view of the above-mentioned conventional circumstances, the present inventors can solve the above-mentioned problems, and even if thermal expansion and contraction occur in the molten resin supply pipe base formed of the base pipe, the displacement of the manifold hold pipe with respect to the gate pipe does not occur The inventors have earnestly continued research on a molten resin supply device in a molten resin pressure molding device capable of supplying the molten resin well and easily adjusting the supply flow rate of the molten resin.

(Means for Solving the Problem) That is, in this invention, a gate pipe is connected to a manifold hold pipe, and the molten resin fed from the molten resin supply pipe base through the manifold hold pipe into the gate pipe is moved upward from the gate port. In a molten resin pressure molding apparatus for supplying pressure into a mold device consisting of a mold and a lower mold, the molten resin supply pipe base is composed of a plurality of base pipes connected on one path, Provided is a molten resin supply device in a molten resin pressure molding device in which one or two or more manifold pipes are arranged in parallel with each other in a plurality of base pipes and are connected to each other through pillar pipes. By doing so, we have succeeded in creating something that can solve the above problems.

(Embodiment) An embodiment of a molten resin supply device in a molten resin pressure molding device according to the present invention will be described below with reference to FIGS. 1 and 2.

This molten resin pressure molding device is equipped with a mold device having a lower mold (1) and an upper mold (not shown).
A gate portion (2) is provided at a predetermined position of (1).

In this gate portion (2), a gate spool (3) is fitted into a through hole (1a) provided at a predetermined position of the lower die (1).

The gate spool (3) is provided with a gate opening (3a) at the lower end, and a taper hole (3b) is formed from the gate opening (3a) to the inner bottom surface position of the lower die (1).

The gate opening (3a) of the gate spool (3) is opened and closed by the tip inclined surface (5a) of the gate pin (5) arranged in the gate pipe (4) located below the gate spool (3). It has become so.

The lower end of this gate pipe (4) is a manifold hold pipe.
It is connected to the upper part of the tip of (6) by fitting.

A hydraulic cylinder (7) is attached to the lower surface of the tip of the manifold hold pipe (6) through a mounting block, and the gate pin (5) is moved up and down by the hydraulic cylinder (7). There is.

The many hold pipes (6) are provided side by side, and a plurality of base pipes connected on one path by the configuration described later.
(8), (8), is connected to the base pipe (8) of the molten resin supply pipe base consisting of (8), (8), (8) in a branched manner via pillar pipes (9), respectively. There is.

That is, the second and third base pipes (8), (8) are connected to each other through the pillar pipe (9) at locations near both ends in the longitudinal direction of the first base pipe (8) arranged in the center. First Base Tube (8)
One manifold hold pipe (6) is connected to the central part of the longitudinal direction of the pipe through a pillar pipe (9), and the second and third base pipes (8) and (8) on both sides are connected in the longitudinal direction. Many hold pipes (6), (6), and (6) are connected to each other through pillar pipes (9), respectively, in the vicinity of the center and both ends in the longitudinal direction.

Incidentally, in this embodiment, the communication connection structure of the base pipe (8) and the manifold hold pipe (6) is as described above, but it is not limited to the structural form of this embodiment, and if necessary, other It can take a structural form.

For example, it is also possible to set the number of base pipes (8) to six, and to connect one or more than one many hold pipes (6) to each base pipe (8).

It is to be noted that reference numerals (10) and (10) in FIG. 2 denote heaters provided on the outer peripheral portion of the gate pipe (4) so as to surround the outer peripheral portion.

In the molten resin pressure molding device having the molten resin supply device configured as described above, the molten resin changes from the first base pipe (8) to the second and third base pipes (8), (8). It is fed into a manifold hold pipe (6) which is connected to the first base pipe (8).

Further, a manifold hold pipe connected from the second and third base pipes (8) and (8) to the second and third base pipes (8) and (8).
Molten resin is fed into (6), (6), and so on.

The molten resin sent into these many-hold pipes (6), (6) ... is the many-hold pipes (6), (6) ...
Gate pipes (4), (4) ...
Sent to each.

The molten resin sent to these gate pipes (4) is separated from the gate port (3a) of the gate pin (5) by the gate port (3
Through the gate opening (a), the material is supplied from the gate opening (3a) into the mold apparatus and pressure-molded.

A plurality of base tubes (8) connected on one path as described above,
(8), one or more Manihold pipes (6), (6), etc. are arranged side by side in a branched manner at the base of the molten resin supply pipe consisting of (8) via pillar pipes (9) respectively. Since the molten resin supply pipe base is composed of a plurality of base pipes (8) even if thermal expansion and contraction occur in the molten resin supply pipe base, the molten resin supply pipe base is Compared to the one consisting of a single base pipe (8), its expansion and contraction length becomes shorter, and this thermal expansion and contraction is absorbed by the pillar pipe (9), so the displacement of the manifold hold pipe (6) is large. Not
Therefore, the connected state between the manifold hold pipe (6) and the gate pipe (4) can be normally maintained, and the molten resin can be satisfactorily supplied.

Further, by setting the diameter of the supply passage of each manifold hold pipe (6) to a size suitable for each position, the supply flow of the molten resin can be improved.

That is, for example, a manifold hold tube at the central position in the arranging direction.
The diameter of the Manihold tubes (6) and (6) on both ends of the parallel installation direction is larger than the diameter of the supply path of (6). It is possible to improve the flow of the molten resin in the supply paths of the manifold hold pipes (6) and (6) on both end sides.

In addition, by installing a valve for adjusting the amount of molten resin supply on the tip side of each manifold hold pipe (6), a gate pipe connected to these manifold hold pipes (6)
The amount of molten resin supplied to (4) can be adjusted, and the optimum amount of molten resin can be supplied.

In addition, in the above embodiment, the gate pin is provided in the gate pipe (4).
Although the molten resin pressure molding device having a structure in which (5) is distributed has been described, the present invention is not limited to the device having the structure of the above embodiment,
The present invention can also be applied to a device having a structure without a gate pin.

(Effect of the device) This device has a gate pipe connected to a manifold hold pipe, and the molten resin fed from the molten resin supply pipe base through the manifold hold pipe into the gate pipe is fed from the gate opening to the upper mold and the lower mold. In the molten resin pressure molding apparatus configured to supply pressure into the mold device, the molten resin supply pipe base is composed of a plurality of base pipes connected in one path, and the plurality of base pipes are connected. In addition, one or two or more Manihold pipes are connected in parallel through the pillar pipes in a state of being juxtaposed in a branched shape, respectively, so that the following effects can be obtained.

That is, one or two or more Manihold pipes are connected in a branched manner in parallel to each other via pillar pipes to the molten resin supply pipe base consisting of a plurality of base pipes connected on one path. Due to this, even if thermal expansion and contraction occur in the molten resin supply pipe base, the molten resin supply pipe base is composed of a plurality of base pipes, so compared to a molten resin supply pipe base composed of a single base pipe. The expansion and contraction length is shortened, and this thermal expansion and contraction is absorbed by the pillar tube, so the displacement of the manifold hold tube does not increase,
Therefore, the connected state between the manifold hold pipe and the gate pipe can be normally maintained, and the molten resin can be satisfactorily supplied.

Further, the supply flow rate of the molten resin from each base pipe to the many hold pipe can be easily adjusted by changing the diameters of the supply passages in the base pipe and the many hold pipe.

In addition, even if a weight is applied to the gate pipe from above, the weight applied to the manifold hold pipe connected to this gate pipe is absorbed by the pillar pipe connected to the place connected to the base pipe, and the manifold hold pipe is damaged. Never.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view of a main part of a molten resin pressure molding device equipped with an embodiment of the molten resin supply device according to the present invention, and FIG. 2 is a main part of the molten resin supply device. It is a top view. (1)… Lower mold, (3a)… Gate mouth (4)… Gate pipe, (5)… Gate pin (6)… Many hold pipe, (8)… Base pipe (9)… Pillar pipe

Claims (1)

[Scope of utility model registration request] 1. A mold apparatus in which a gate pipe is connected to a manifold hold pipe, and molten resin fed from a molten resin supply pipe base through the manifold hold pipe into the gate pipe is composed of an upper mold and a lower mold from a gate opening. In the molten resin pressure molding apparatus which is configured to be supplied into and pressure-molded, the molten resin supply pipe base portion is composed of a plurality of base pipes connected on one path, and one or a plurality of base pipes are provided to the plurality of base pipes. A molten resin supply device in a molten resin pressure molding device in which two or more many hold pipes are arranged in a branched shape and are connected to each other via pillar pipes.