JPH0585608U - Cooling water circulation path for resin molding dies - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a cooling water circulation passage for a resin molding die that can cope with a variety of dimensions between the cooling water inlet and outlet of the molding die. [Structure] Male screw (3) screwed from the outside into female screw hole (2) recessed in the vicinity of cooling water inlet / outlet (1a), (1b) of mold (1)
Between the holes (4), (4) and these holes (4), (4),
The openings (7) that should communicate with the cooling water inlet / outlets (1a) and (1b), respectively.
In a tubular body made of a synthetic resin, which comprises a) and (7b) and a conduit section (8) with both ends sealed, the openings (7a), (7)
On the outside of the pipe line portion of b), recesses (5) and (5) each having a length larger than the opening diameter are formed in the longitudinal direction of the pipe line portion (8) centering on the opening and contacting the side surface of the mold. Ring-shaped packings (10) and (10) are mounted on the periphery of the recesses (5) and (5), respectively.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling water circuit for a molding die used in a plastic injection molding machine or the like.

[0002]

[Prior Art]

 A conventional cooling device for a molding die is a step for preventing the plug from coming out by screwing a male screw leg portion of a plug into a female screw hole formed in a refrigerant inlet / outlet portion on a non-contact side surface of a pair of dies. The hose is attached to the hose connection part that has a curved surface. Therefore, the liquid cooling medium (hereinafter referred to as "cooling water") that has flowed in from the inlet located on the other side surface of the mold flows through the mold and then flows again from one plug to the other plug through the hose. Then, it flows through the mold again and flows out. The hose is cut and used according to the space between the inlet and the outlet of the cooling water.

[0003]

[Problems to be solved by the device]

 However, in such a conventional cooling device, since the plug and the hose attached thereto largely protrude to the side of the mold, it is necessary to secure a large space for mounting the mold inside the molding machine. It also occupies a large space for storage. In addition, the protruding hose is likely to hit other objects and be damaged, which is not desirable in terms of aesthetics. In addition, since the material of the hose is usually rubber, the heat inside the mold accelerates the aging process, which poses a problem in terms of durability. If an aged perforated hose is used unknowingly, it may cause troubles in the injection molding process and adversely affect the product quality.

Therefore, in order to solve the problems of the conventional cooling device, the present invention attaches a synthetic resin, preferably a synthetic resin having an appropriate heat resistance, to the outer surface of the mold. By forming a power cylinder and compensating for the flexibility not possessed by the synthetic resin from the structural aspect of the cylinder, various mold sizes, especially the size of the gap between the cooling water inlet and outlet, can be reduced. The purpose is to expand the range in which the cooling water circuit with a certain size can be applied.

[0005]

[Means for Solving the Problems]

 The configuration 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 circuit for a resin molding die according to the present invention is a mold (1 ), At least two mounting holes (3) to which the male screw (3) screwed from the outside is inserted into the female screw hole (2) recessed near the cooling water inlet / outlet (1a), (1b). Between (4) and (4) and these holes (4) and (4), openings (7a) and (7b) communicating with the cooling water inlet / outlets (1a) and (1b) are provided. And a pipe portion (8) whose both ends are sealed, wherein the pipe portion (8) is formed at a position including the opening on the side where the openings (7a) and (7b) are formed. The recesses (5), (5) extending longer than the respective opening diameters are formed along the longitudinal direction of (8), and the ring-shaped packing (10) is formed on the periphery of both recesses (5), (5). This is a structure in which (10) are fitted together.

The elongated recess (5) has an elliptical shape as an example, but a commonly-used rubber O-ring (o-ring) is elastically deformed into an elliptical shape and easily fitted into the packing accommodating groove (11). be able to.

[0007]

[Action]

 Since the present invention has such a configuration, the size of the mold itself differs depending on the size of the molded object and the number of pieces to be molded. Even if the intervals between the molds differ from one mold to another, the above-mentioned recesses extend in the longitudinal direction of the pipe section, and as an example, are recesses that open inward (downward in the figure) of an ellipse or an ellipse. As long as the cooling water inlet / outlet is within the recess, a circulation path of the same dimensions can be attached to these molds and used without problems. That is, as long as the cooling water inlet / outlets (1a) and (1b) are molds that fit within the distance (D) and the same (d) shown in FIG. 2, the same circulation path is installed according to the present invention. It can be used.

Therefore, if the circulation path of the present invention is prepared with several kinds having different sizes and the proper one is selected and used according to the mold size at the resin molding site, the mold size is Can easily deal with changes and variety. As a result, not only can the manufacturing cost of the circuit be reduced, but it is also convenient for the maintenance of the mold and accessories.

[0009]

【Example】

 An embodiment 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-walled touch-resistant metal pipe, for example, a stainless steel pipe (12), which is made of an appropriate synthetic resin with its holes (12a) and (12b) closed It is insert molded into.

The holes (12a), (12b) of the stainless steel pipe (12) in the first embodiment are the openings (7a), (of the synthetic resin conduit part (8) whose both ends are sealed. 7b), which are pre-drilled with approximately the same diameter and concentricity, and the plug for sealing (not shown) is tightly fitted to these, and the insert molding described above is performed. There is no burr-like formation of resin lumps in the vicinity of the openings (7a) and (7b), and therefore there is no risk of impeding the flow of cooling water through the openings. After being insert-molded in this way, the steel pipe functions as a reinforcing material for the synthetic resin pipe section (8).

Since the outline of the structure of the first embodiment has already been described above, only a few supplements will be given here. The part (6a) in which the holes (4), (4) for inserting the male screw (3) to be screwed into the female screw hole (2) on the side of the mold (1) are drilled, is the conduit (8). It is formed integrally with the, and has a "kamaboko shape" with rounded sides. And, since a large diameter stepped recess (4a) deeper than the head (3b) with the hexagonal hole (3a) of the male screw (3) is provided on the outer inlet side of the hole (4), Even after the cooling water circulation passage of the present invention is attached to the side surface of the mold by tightening the screw, the screw head does not project outward. Therefore, there is no risk that the screw will unexpectedly come loose and damage the seal of the packing (10).

[0012] The cooling water outlet (1a) and the inlet (1b) should be communicated with the openings (7a), (7b) on the outer surface side, respectively, and extend in the longitudinal direction of the conduit (8) around the openings. The recessed parts (5) and (5) are formed on the lower surface of the pipe line part (8) over the part (6b) near the both ends of the pipe line part that is integral with the above-mentioned part (6a). An O-ring having a cross-sectional diameter larger than the depth of the groove is attached to the groove (11) at the periphery of the recesses (5), (5) as the packings (10), (10). ..

Therefore, as is apparent from FIG. 6, since the concave portion (5) is completely sealed to the outside, and thus the pipe line portion (8) is also sealed to the outside in a watertight manner, There is no risk of the cooling water leaking out, and as shown in Fig. 2, the cooling water flowing from the cooling water outlet (1a) on the mold side through the recess (5) through the opening (7a) into the pipe section (8) is It flows toward the other opening (7b) as shown by the arrow (Y), and then returns to the mold (1) again from the cooling water inlet (1b) through the other recess (5) facing it. To do.

A hollow portion (9) is provided in the center of the lower surface of the pipe line portion, which cuts off heat transfer from the relatively high temperature mold (1) and also secures the tightening force by the screw (3). By concentrating on the periphery of the recess (5), there is an effect of further enhancing the sealing action.

In the second embodiment shown in FIG. 11, the peripheral wall (8a) of the pipe section (8) is made uniform over the entire circumference, and this makes it possible to reduce the flow of resin during insert molding. In this way, the internal strain does not remain. Other configurations and operations are similar to those of the first embodiment.

The third embodiment shown in FIGS. 12 to 13 has a prismatic shape having a substantially square cross section except for both ends, but other configurations and actions are similar to those of the first embodiment. is there.

In the fourth embodiment shown in FIG. 14, the metal cylinder is not insert-molded, but the cavity (13) reaching one end open to the other end is formed by resin molding using a core. It is formed in the longitudinal direction at the center. After molding, a male threaded plug (15) is screwed into the open side end where a female thread (14) slightly larger than the inner diameter of the pipe is engraved, and the tubular body end and A screw hole (4) is formed so as to penetrate through the plug (15). Note that the number (16) in the figure is a hexagonal hole for inserting a screwdriver in the plug head, and (17) is for sealing between the inner end of the plug and the shoulder step at the inner end of the female thread (14). It is a small O-ring inserted. This example is convenient because the cooling water circulation path of the present invention can be easily formed by a normal molding method instead of the insert molding method, which is not easy to operate.

Although the embodiments considered to be typical of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments, and has the above-mentioned configuration requirements according to the present invention, and The present invention can be carried out with appropriate modifications within the scope of achieving the object of the present invention and having the following effects.

[0019]

[Effect of the device]

 As is apparent from the above description, according to the present invention, all the above-mentioned defects of the conventional device can be solved at once. In other words, the cooling water circulation path can be attached to the side surface of the mold in a position close to it, and the amount of protrusion to the outside of the side surface of the mold can be suppressed to be smaller than that of the conventional device. As a result, not only is it convenient for mounting in the mold and storing it outside the mold, but also the material can be selected from among moderately heat resistant synthetic resins other than rubber, so there is a risk of damage due to aging. Also few. Moreover, since the concave portion corresponding to the cooling water inlet / outlet from the mold is sufficiently larger than the diameter of the inlet / outlet, if several kinds of cooling water circulation paths of the present invention are prepared, the cooling water inlet / outlet of the mold is prepared. The size of the distance can be easily adjusted.

[Brief description of 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.

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

FIG. 7 is a side view of the same.

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

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

10 is a cross section taken along line XX in FIG.

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.

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

FIG. 14 is a vertical cross-sectional view of a central portion showing a fourth embodiment corresponding to FIG.

[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 line Parts (10) Packing

Claims (1)

[Scope of utility model registration request] 1. A male screw which is externally screwed into a female screw hole (2) recessed in the vicinity of the cooling water inlet / outlet (1a), (1b) of the mold (1).
At least two mounting holes (4), which should be inserted through (3),
Between the (4) and these holes (4), (4), the cooling water inlet / outlet
A tubular object having openings (7a) and (7b) communicating with (1a) and (1b) respectively, and a conduit section (8) with both ends sealed, On the formation side of (7a) and (7b), recesses (5) and (5) extending longer than the diameter of each opening are formed along the longitudinal direction of the conduit (8) at a position including the opening. , These two recesses
A cooling water circulation passage for a resin molding die in which ring-shaped packings (10) and (10) are fitted around the periphery of (5) and (5), respectively.