JPS62130761A - Cooling method for metallic mold - Google Patents

Abstract

PURPOSE:To cool a metallic mold to a stable temp. without overcooling and to form a product having excellent quality by ejecting water drops or mists to the rear of the metallic mold which is heated to a high temp. by the input heat from a molding material. CONSTITUTION:The rear surface side 1 of the metallic mold A is gouged toward the part near the rear of the front surface 2a of a cavity 2 to form a recessed part 3 and the base of the part 3 is made the rear surface 4 of the mold A. A suitable number of spray nozzles are disposed to the rear surface side of the mold A and the water drops or mists (a) are injected toward the rear surface 4. Since the mold.A is heated to the high temp. by the input heat from the molding material packed in the cavity 2, the greater part of the water drops or mists evaporate. The mold A is cooled by the evaporation heat and the temp. elevation of the water drops or mists (a). The overcooling of the metallic mold by overflowing of the cooling water is thus obviated and the mold temp. is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for cooling a mold used in die casting, mold casting, low pressure casting, resin injection molding, etc.

<Conventional technology> In the conventional mold cooling method, cooling water was continuously circulated and supplied into cooling holes drilled on the back side of the mold, so strict measures against water leakage had to be taken. At the same time, too much cooling water could flow and cool the mold too much.

<Problems to be Solved by the Invention> The problems to be solved by the present invention are to provide a cooling method that does not have to worry about cooling the mold too much and can easily cool the required parts of the mold to the required amount. It is about providing.

<Means for Solving the Problems> The technical means taken by the present invention to solve the above problems is characterized by spouting water droplets or mist onto the back surface of the mold.

The mold described above may be a regular mold with a flat back surface.

Effect> Water droplets or mist are ejected onto the back of the mold, which has become warm due to heat input from the molding material filled in the cavity, and most of the water droplets or mist are evaporated, and the heat of vaporization at that time is The temperature of the water droplets or mist increases to cool the mold.

<Example> An example of the present invention will be described based on the drawings.
) connects its back side (1) to the cavity (2) surface (2a
) to the extent that the strength of the mold is not impaired, and a recessed notch (3) is formed near the back of the recessed notch (3).
The bottom surface of 3) is the back surface (4) of the mold (A). This recessed notch (3) is effective when the mold (A) is thick (mold thickness), and when the mold thickness is thin, the back side may be formed flat as usual. .

Then, an appropriate number of spray nozzles (5) are arranged on the back side of the mold (A), and water droplets or na are ejected toward the back side (4). The spray nozzle (5) is connected to a pipe (
6) in communication with a spray source (not shown);
Water droplets or mist a are ejected onto the back surface (4) of the mold (A) at the timing of the product molding process.

Since the mold (A>) is at a high temperature due to the heat input from the molding material filled in the cavity (2), the back side (4) of the mold (A>) is heated at the timing of the product molding process. When the water droplets or mist a are ejected from the spray nozzle (5), the water droplets or mist a touch the back surface (4) of the mold (A) and most of them evaporate and vaporize, and the heat of vaporization and the water droplets or mist are The mold (A) is cooled by the temperature rise of a.

<Effects of the Invention> The mold cooling method of the present invention cools the mold by spouting water droplets or mist onto the back surface of the mold, similar to soft soil. There is no need to worry about cooling the mold too much, and even if the cycle is disrupted due to some kind of trouble during product mass production, the mold temperature will not drop suddenly. Therefore, the mold temperature can be stabilized and high-quality products can be produced. Good productivity (can be molded.

In addition, it is economical because it does not require strict water leakage countermeasures as in the conventional method that uses cooling water, and it is also economical because water droplets or mist are preferentially ejected to thick parts with a large amount of heat. It becomes easy to partially cool the required parts of the mold.

Therefore, the intended purpose can be achieved.

[Brief explanation of drawings]

The drawings are cross-sectional views showing embodiments of the present invention. In the diagram (A): Gold mold (4): Back side of mold (2): Cavity (a) Two water droplets or mist

Claims (1)

[Claims] A mold cooling method characterized by spouting water droplets or mist onto the back surface of the mold.