JPH10202662A - Mold cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the mold temperature uniformly and cool a mold in a short period of time by providing a cooling air jet means for jetting cooling air toward a molding surface of the mold. SOLUTION: A mold cooling device is provided with a cooling medium passage 2 for circulating a cooling medium such as water or oil and a cooling air jet means 3 for jetting cool air toward a molding surface of a bottom force 7b. The cooling air jet means 3 is provided with a jet pipe 4 provided in the bottom force 16 and a compressor 5 for generating compressed cooling air to be fed into an intake vent 8 of the jet pipe 4. A temperature controller for controlling the cooling air temperature is connected with the compressor 5. The mold cooling device is provided above a surface of the bottom mold 1b and provided with an opening and closing switch 6 for sensing the opening and closing of the mold 1. When the opening of the mold 1 is sensed by the opening and closing switch 6, a jet section is opened by a jet section opening means 7 of the cooling air jet means 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold cooling apparatus, and more particularly to a mold cooling apparatus capable of locally cooling a molding surface of a mold after injection molding.

[0002]

2. Description of the Related Art In general, when a thermoplastic material is injection-molded, the temperature of a mold immediately after the injection molding is high, so that the mold must be cooled by a cooling device.

A conventional mold cooling device is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-169453. As shown in FIG. 4, the mold cooling device is provided in a mold plate on the cavity side and the core side of the upper mold 20 and the lower mold 21, and a cooling medium passage for circulating a cooling medium such as water or oil. 22. A temperature controller (not shown) for controlling the temperature of the cooling medium is connected to the cooling medium passage 22.

According to the conventional mold cooling device, after injection molding, a cooling medium whose temperature has been adjusted by a temperature controller is supplied to the cooling medium passage 22 and circulated.
The upper mold 20 and the lower mold 21 are cooled.

[0005]

The conventional mold cooling apparatus has the following problems. (1) In order to cool the mold effectively, it is desirable to arrange the cooling medium passage 22 so as to follow the shape of the molded product S. However, in actuality, the cooling medium passage 22 is obstructed by protrusion pins, core pins, bolts and the like. In some cases, a reasonable arrangement cannot be made. In such a case, a portion where the temperature rises, such as a molding surface portion of the mold, is locally generated, and the temperature distribution of the mold becomes non-uniform, and it is difficult to uniformly control the mold temperature. (2) Since the mold is cooled by the heat transfer from the cooling medium passage 22 provided inside the mold, the cooling medium passage 2
It takes time to cool the mold surface portion of the mold at a distance from 2, and it is difficult to rapidly cool the mold. for that reason,
Decreases productivity of molded products.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a mold cooling apparatus capable of uniformly controlling a mold temperature and cooling a mold in a short period of time.

[0007]

According to the present invention, there is provided a mold cooling apparatus for cooling a mold by circulating a cooling medium through a cooling medium passage provided inside the mold. It is characterized by having cooling air jetting means for jetting cooling air toward the molding surface.

According to the present invention, even when the cooling medium passage cannot be arranged along the shape of the molded article due to the protruding pin, the core pin, the bolt, etc., the molding surface of the mold is cooled by the cooling air. Therefore, the place where the temperature rises does not occur locally. Further, since cooling to the molding surface portion by the cooling air is performed simultaneously with cooling by heat transfer from the cooling medium passage provided inside the mold, rapid cooling becomes possible.

The mold cooling device of the present invention further comprises an opening / closing detecting means for detecting the opening / closing of the mold, and an ejection opening means for opening the ejection portion of the cooling air ejection means when the opening / closing detection means detects the opening of the mold. It is preferable to have a section opening means.

[0010] The cooling air ejection means has an ejection pipe provided inside the mold and a compressor for generating compressed cooling air to be supplied to the ejection pipe.

The opening / closing detecting means is a rotating member rotatably supported at a substantially central portion as a fulcrum, and the ejection opening means is provided on one side of the rotating member, and enters and exits the ejection section. An opening and closing member for opening and closing the unit may be used. in this case,
When the mold is in the closed state, the mold surface comes into contact with the other side of the rotating member, the opening / closing member enters the ejection section, closes the ejection section, and when the mold is in the open state, Since the mold surface separates from the other side of the member and the opening / closing member comes out of the ejection part and opens the ejection part, the opening / closing of the mold is detected and the ejection part of the cooling air ejection means is opened mechanically. Just can be done.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing a mold provided with the mold cooling device of the present invention. The mold cooling device of the present invention is used for cooling a mold 1 for manufacturing a molded article S such as a cover by injection molding a thermoplastic material.

As shown in FIG. 1, the mold cooling device of the present invention is provided in a mold plate on the cavity side and the core side of the upper mold 1a and the lower mold 1b, and is provided with a cooling medium such as water or oil. It has a cooling medium passage 2 to be circulated, and cooling air jetting means 3 for jetting cooling air toward the molding surface of the lower mold 1b.
Although the cooling air jetting means 3 is provided only in the lower mold 1b which is likely to be heated to a high temperature, the cooling air jetting means may be provided in the upper mold 1a.

The cooling air blowing means 3 includes a blowing pipe 4 provided inside the lower mold 1b and a compressor 5 for generating compressed cooling air to be supplied to an intake port 8 of the blowing pipe 4. Have. A temperature controller (not shown) for adjusting the temperature of the cooling air is connected to the compressor 5.

The mold cooling device of the present invention is also provided on the surface of the lower mold 1b, and detects an open / close of the mold 1 by the open / close switch 6, and detects the opening of the mold 1 by the open / close switch 6. Then, there is an ejection part opening means 7 for opening the ejection part of the cooling air ejection means 3. As the ejection part opening means 7,
For example, when an electromagnetic valve or the like is used and the mold 1 is in a closed state, the electromagnetic valve is in a closed state. When the open / close switch 6 detects that the mold 1 is opened, the electromagnetic valve is switched to an open state. Works as follows.

Next, the operation of the mold cooling device of the present invention will be described. After injection molding, the closed mold 1 opens,
When the molded product S is taken out, the opening / closing switch 6 detects it, and the ejection portion opening means 7 operates to open the ejection portion.
Thereby, the cooling air supplied from the compressor 5 to the ejection pipe 4 via the intake port 8 is ejected from the ejection port 9 and hits the molding surface of the lower mold 1b, thereby cooling the molding surface. The mold 1 is cooled by circulating a cooling medium through the cooling medium passage 2 inside the mold 1.

According to the mold cooling device of the present invention, even if the cooling medium passage 2 cannot be arranged along the shape of the molded product S due to the protruding pins, core pins, bolts, etc. Since the molding surface of the mold 1b is cooled, a portion where the temperature rises does not occur locally, and the mold temperature can be uniformly adjusted.

Further, since cooling to the molding surface by the cooling air is performed simultaneously with the cooling by the heat transfer from the cooling medium passage 2 provided inside the mold 1, rapid cooling becomes possible. As a result, the molding cycle can be shortened, and the productivity of the molded article S can be improved.

FIG. 2 is a cross-sectional view showing a mold provided with a mold cooling device according to another embodiment of the present invention. FIG. 3 is a view for explaining the operation of the ejection portion opening means of the mold cooling device of FIG. FIG.

As shown in FIG. 2, in a mold cooling apparatus according to another embodiment of the present invention, cooling air jetting means 3 is provided at two places on the left and right of the lower mold 1b. As shown in FIG. 3, each mold cooling device is pivotally attached to one end of the plate-shaped rotating member 10 rotatably supported at a substantially central portion as a fulcrum. An opening / closing member 11 having a distal end that enters and exits the ejection section and opens and closes the ejection section. A spring 12 for urging the rotating member 10 counterclockwise is attached to the other end of the rotating member 10.

When the mold 1 is in the closed state, the mold surface of the upper mold 1a comes into contact with the other end of the rotating member 10, and the tip end of the opening / closing member 11 enters the ejection section and closes the ejection section. Close (see FIG. 3A). When the mold 1 is in the open state, the mold surface of the upper mold 1a is separated from the other end of the rotating member 10, and the rotating member 10 rotates counterclockwise to
1 operates so that the front-end | tip part may come out of an ejection part, and may open an ejection part (refer FIG.3 (B)).

According to the mold cooling device of another embodiment of the present invention, the opening / closing of the mold 1 can be detected and the ejection portion of the cooling air ejection means can be opened only by mechanical operation.

The present invention is not limited to the above embodiment, and various changes can be made within the scope of the technical matters described in the claims. For example, an opening / closing plate (not shown) may be provided at the ejection port 9 as the ejection opening means 7, and the opening / closing plate may be opened when the opening / closing switch 6 detects the opening of the mold 1.

Further, the shape, arrangement, number and the like of the cooling air jetting means 3, the opening / closing switch 6, the jetting part opening means 7, etc. are not limited to those disclosed in the drawings, but may be changed according to the shape of the molded article S and the working environment. It can be changed as appropriate.

[0025]

According to the mold cooling device of the present invention, the following excellent effects can be obtained. (1) Even when the cooling medium passage cannot be arranged along the shape of the molded product due to the protruding pins, core pins, bolts, etc., the molding surface of the mold is cooled by the cooling air, so that the temperature rises. This does not occur locally, and the mold temperature can be adjusted uniformly. (2) Since cooling to the molding surface by the cooling air is performed simultaneously with cooling by heat transfer from the cooling medium passage provided inside the mold, rapid cooling is possible. As a result, the molding cycle can be shortened and the productivity of the molded article can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mold provided with a mold cooling device of the present invention.

FIG. 2 is a sectional view showing a mold provided with a mold cooling device according to another embodiment of the present invention.

3 (A) and (B) are explanatory diagrams for explaining the operation of an ejection part opening means of the mold cooling device of FIG. 2;

FIG. 4 is a sectional view showing a conventional mold cooling device.

[Explanation of symbols]

 1: mold 1a: upper mold 1b: lower mold 2: cooling medium passage 3: cooling air ejection means 4: ejection pipe 5: compressor 6: open / close switch 7: ejection section opening means 8: intake port 9: ejection Exit 10: Rotating member 11: Opening / closing member

Claims (4)

[Claims] 1. A mold cooling apparatus for cooling a mold by circulating a cooling medium through a cooling medium passage provided inside the mold, wherein the cooling air ejects cooling air toward a molding surface of the mold. A mold cooling device comprising air ejection means. 2. The apparatus according to claim 1, further comprising an opening / closing detecting means for detecting opening / closing of the mold, and an ejection opening means for opening the ejection section of the cooling air ejection means when the opening / closing detection means detects the opening of the mold. The mold cooling device according to claim 1, wherein: 3. The cooling air ejection means has an ejection pipe provided inside a mold, and a compressor for generating compressed cooling air to be supplied to the ejection pipe. Or the mold cooling device according to 2. 4. The opening / closing detecting means is a rotating member rotatably supported about a substantially central portion as a fulcrum, and the ejection opening means is provided on one side of the rotating member. An opening / closing member that opens and closes the ejection portion when the mold is in a closed state. When the mold surface is in contact with the other side of the rotating member, the opening / closing member enters the ejection portion and ejects the ejection portion. When the mold is in the open state, the mold surface is separated from the other side of the rotating member, and the opening / closing member comes out of the ejection section to open the ejection section. Item 4. The mold cooling device according to item 2 or 3.