JP2581786Y2 - Cooling water circuit for resin mold - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water circuit for a molding die used in a plastic injection molding machine or the like.

[0002]

2. Description of the Related Art In a conventional cooling device for a molding die, a male screw leg of a plug is screwed into a female screw hole recessed in a refrigerant inlet / outlet portion on a non-contact side surface of a pair of dies. The hose is attached to a hose connecting portion having a stepped peripheral surface for retaining the hose. Therefore, the liquid cooling medium (hereinafter referred to as “cooling water”) flowing from the inlet located on the other side of the mold.
After flowing through the mold, it flows again from one plug through a hose to another plug, and flows again through the mold and out. The hose is cut and used in accordance with the distance between the inlet and the outlet of the cooling water.

[0003]

However, in such a conventional cooling device, the plug and the hose attached to the plug protrude greatly to the side of the mold, so that the space for mounting the mold inside the molding machine is provided. Must be kept large, and occupy a large space for storage. In addition, a protruding hose is likely to be damaged by hitting another object, which is not preferable in aesthetic appearance. Further, since the material of the hose is usually rubber, aging progresses rapidly due to heat inside the mold, and there is also a problem in durability.
If an aging perforated hose is used without knowing it, it will cause troubles in processes such as injection molding and adversely affect product quality.

Therefore, in order to solve the problems of the conventional cooling device, the present invention requires that a synthetic resin, preferably a synthetic resin having appropriate heat resistance, be attached to the outer surface of the mold. By forming a cylindrical body and compensating for the flexibility not provided in the synthetic resin from the structural aspect of the cylindrical body, it is possible to cope with various mold dimensions, in particular, the size of the gap between the cooling water ports. In this way, an object of the present invention is to expand a range in which a cooling water circuit of a certain size can be applied.

[0005]

The structure of the present invention for achieving this object will be described with reference to the numbers in FIGS. 1 to 10 corresponding to one embodiment. The cooling water circulation path is connected to the cooling water inlet / outlet (1) of the mold (1).
a), at least two mounting fixing holes (4), (4) into which a male screw (3) screwed from the outside into a female screw hole (2) recessed outside in the vicinity of (1b); And between these two holes (4), (4), the cooling water port (1a),
An opening (7a) communicating with (1b), and a tubular body (8) integrally formed with a pipe portion (8) in which both ends are perforated and sealed at both ends. , The opening (7a),
On the formation side of (7b), recesses (5) and (5) extending longer than the respective opening diameters are formed along the longitudinal direction of the pipe section (8) at positions including the openings, respectively. A ring-shaped packing (1) is formed around the recesses (5) and (5).
0) and (10) are fitted to each other.

The elongated concave portion (5) has an elliptical shape as an example. The elastic concave portion (5) is easily fitted into the packing accommodating groove (11) while elastically deforming a commonly used rubber O-ring (O-ring) into an elliptical shape. be able to.

[0007]

According to the present invention, the configuration of the present invention is such that the dimensions of the mold itself vary depending on the dimensions and the number of pieces to be molded. Even if the distance between the molds differs from one mold to another, the above-mentioned concave portion extends in the longitudinal direction of the conduit portion, and is, for example, a concave portion opened inward (downward in the figure) of an oval or elliptical shape. Therefore, as long as the cooling water inlet / outlet can be accommodated in the recess, a circulation path having the same dimensions can be attached to these molds and used without any problem. That is, cooling water inlet / outlet (1a), (1b)
According to the present invention, the same circulation path can be installed and used as long as the mold is within the range of the distance (D) and the distance (d) shown in FIG.

Accordingly, the circulation path of the present invention is prepared in several types having different dimensions, and an appropriate one is selected and used according to the die dimensions at the resin molding site. Changes and diversity can be easily handled. As a result, not only can the production cost of the circuit be reduced,
It is also convenient for maintenance of molds and accessories.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIGS. 1 to 10, a thin, touch-resistant metal pipe, for example, a stainless steel pipe (12) is made of a suitable synthetic resin with its holes (12a), (12b) closed. Insert molded into.

In the first embodiment, the holes (12a) and (12b) of the stainless steel pipe (12) are provided with openings (7a) and (7a) of a synthetic resin pipeline (8) whose both ends are sealed. 7b) is pre-drilled to be approximately the same diameter and concentric in advance,
Since plugs for sealing (not shown) are tightly fitted to these parts and the insert molding is performed, resin lumps do not form in the form of burrs near the openings (7a) and (7b). Therefore, there is no possibility that the flow of the cooling water through the opening may be hindered. After being insert-molded in this way, the steel pipe functions as a reinforcing material for the synthetic resin pipeline (8).

Since the outline of the structure of the first embodiment has already been described above, only a few supplements will be given here. Holes (4a) into which male screws (3) to be screwed into female screw holes (2) on the side of the mold (1) are to be inserted (6a) are pipe lines (8)
, And as a whole, have a “kamaboko shape” with rounded edges on both sides. And a large-diameter stepped recess (4a) deeper than the head (3b) with a hexagonal hole (3a) of the male screw (3)
Is provided on the outside entrance side of the hole (4), so that the screw head does not protrude outward after the cooling water circulation path of the present invention is attached to the mold side surface by tightening the screw. . Therefore, there is no danger that the screws may be unexpectedly loosened and the sealing by the packing (10) may be damaged.

The cooling water outlet (1a) and the opening (7b), which are to communicate with the inlet (1b), respectively, are extended in the longitudinal direction of the pipe portion (8) around the openings on the outer surface side of the openings (7a) and (7b). Recesses (5), (5)
Is a portion (6) near both ends of the pipe portion that is integral with the portion (6a).
b), the groove (11) on the periphery of the recesses (5), (5) has a cross-sectional diameter larger than the depth of the groove. The O-ring of the packing (10),
Installed as (10).

Therefore, as is apparent from FIG.
Is completely sealed to the outside, and
Since (8) is also sealed to the outside in a watertight manner, there is no danger of cooling water leaking out, and as shown in FIG. 2, the cooling water outlet (1a) on the mold side opens (7a) Pipe line (8)
The cooling water that has flowed toward the other opening (7b) flows as shown by the arrow (Y), passes through the other concave portion (5) opposed thereto, and then returns from the cooling water inlet (1b) to the mold ( Reflux into 1).

A hollow portion (9) is provided at the center of the lower surface of the pipe portion, which cuts off the heat transfer from the relatively hot mold (1) and reduces the tightening force of the screw (3). The recess
By concentrating on the periphery of (5), there is an effect of further enhancing the sealing action.

In the second embodiment shown in FIG.
The peripheral wall (8a) of (8) is made uniform over the entire circumference,
Thereby, the flow of the resin at the time of the insert molding is made uniform so that the internal distortion does not remain. Other configurations and operations are the same as those of the first embodiment.

In the third embodiment shown in FIGS.
Except for both end portions, the cross-sectional profile is a prismatic shape having a substantially square shape. However, other configurations and operations are the same as those of the first embodiment.

In the fourth embodiment shown in FIG. 14, the metal tube is not subjected to insert molding, but is formed by resin molding using a core to form a hollow (13) reaching one end near the other end with a synthetic resin cylindrical body. It is formed in the longitudinal direction at the center. Then, after molding, a plug (15) with a male thread is screwed into the open end where the female screw (14) slightly larger in diameter than the pipe inner diameter is engraved, and the end of the cylindrical body and the Screw hole passing through the plug (15)
(4) is drilled. The number (16) in the figure is a hexagonal hole for inserting a screwdriver in the plug head, and (17) is a seal between the inner end of the plug and the shoulder at the inner end of the female screw (14) for sealing. It is a small O-ring mounted. In this example, the cooling water circulation path of the present invention can be easily formed by a normal molding method without using the insert molding method which is not easy to operate.

The embodiments which are considered to be representative of the present invention have been described above. However, the present invention is not necessarily limited to the structure of the embodiments, but includes the above-mentioned constituent elements according to the present invention, and The present invention achieves the object of the present invention and can be appropriately modified and implemented within a range having the following effects.

[0019]

As is clear from the above description, according to the present invention, all the above-mentioned defects of the conventional device can be eliminated at once. In other words, the cooling water circulation path can be attached to the side surface of the mold so as to be perfectly snug, and the amount of protrusion to the outside of the side surface of the mold can be suppressed smaller than that of the conventional device. As a result, it is not only convenient to attach to the mold and store it outside the mold,
Since the most suitable material can be selected from synthetic resins of moderate heat resistance other than rubber, there is little possibility of damage due to aging. In addition, since the concave portion corresponding to the cooling water inlet and outlet from the mold is sufficiently larger than the diameter of the inlet and outlet, if several types of cooling water circulation paths of the present invention are prepared, the space between the cooling water inlet and outlet of the mold can be obtained. It can easily respond to the size of the distance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a plan view of the first embodiment.

FIG. 4 is a front view of the same.

FIG. 5 is a bottom view of the same.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3;

FIG. 7 is a side view of the same.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 3;

FIG. 9 is a sectional view taken along the line IX-IX in FIG. 3;

FIG. 10 is a section taken along line XX in FIG. 3;

FIG. 11 is a sectional view showing a section of the second embodiment corresponding to FIG. 8;

FIG. 12 is a perspective view showing a third embodiment.

FIG. 13 is a sectional view taken along the line XIII-XIII in FIG. 12;

FIG. 14 is a longitudinal sectional view of a central part showing a fourth embodiment corresponding to FIG. 6;

[Explanation of symbols]

 (1) Mold (1a), (1b) Cooling water inlet / outlet (2) Female screw hole (3) Male screw (4) Male screw insertion hole (5) Recess (7a), (7b) Opening (8) Pipe Part (10) Packing

Claims (1)

(57) [Scope of request for utility model registration] 1. A cooling water inlet / outlet (1a) of a mold (1),
At least two mounting and fixing holes (4), (4) through which a male screw (3) screwed from the outside into a female screw hole (2) recessed outside near (1b), and Both holes (4),
During (4), the cooling water inlets and outlets (1a), (1b)
If that integrally includes an opening for respectively communicating (7a), conduit portion side end (7b) is bored is sealed (8)
A cylindrical body made of synthetic resin , wherein the openings (7a) and (7b)
The recesses (5) and (5) extending longer than the respective opening diameters are formed along the longitudinal direction of the pipe section (8) at positions including the openings on the side where the openings (5) are formed. ,
A ring-shaped packing (10), (1)
0) is a cooling water circulation path for a resin molding die into which each is fitted.