JPH0129048Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a split mold for plastic molding that has a mold part with a cooling water channel installed therein. Concerning structures that protect against intrusion.

(Prior art) Many plastic molded products, generally called molded products, are manufactured by injection molding, blow molding, etc., by press-fitting heated molten resin into the cavity of a split mold, or by blowing it inside the split mold. During molding, the mold is repeatedly heated with high-temperature molten resin, so cooling channels are provided in the mold and circulating water is used to cool it. There is. After molding is completed, the mold is usually stored by removing the water tube and draining the water inside the mold, but when the water tube is removed from the mold, water may splash on the outside surface of the mold, or Moisture remaining in the water channels inside the mold often runs down the outside surface of the mold during storage. Therefore, problems often occur in which water adhering to the outer surface of the mold enters the cavity through the dividing surface and stains or corrodes the mold surface.

(Problem that the invention aims to solve) Therefore, in view of this situation, this invention aims to solve the following problems:
This was proposed primarily to prevent water adhering to the outside surface of the mold from entering the cavity from the dividing surface.

(Means for Solving the Problem) In other words, this invention provides a split mold that can be divided into a plurality of mold parts, in which the mold part between the water pipe attachment part of the mold part in which the cooling water channel is installed and the dividing surface thereof. This invention relates to a split mold for plastic molding characterized in that a drain groove portion is formed on the outer surface along the split surface.

(Example) A detailed description will be given below with reference to the attached drawings.

FIG. 1 is an overall perspective view of a plastic molding die 10 showing an embodiment of this invention, and FIG. 2 is a partially enlarged front view seen from the arrow 2 side in FIG. 1. This mold 10 consists of mold parts 11 and 12 having corresponding cavities, and each mold part has a water channel 16 for circulating water, a part of which protrudes from the outside surface of the mold, and a water pipe 17 is attached thereto. 16a. In FIG. 1, reference numerals 13 and 14 are mold mounting plates, 15 is a dividing surface (parting line), and 20 is a drainage groove portion which is a characteristic structure of this invention.

As shown in FIG. 2, this drain groove section 20 is
It is formed along the dividing surface 15 on the outside surface of the mold portion between the water tube attachment portion 16a on the outside surface of the mold portions 11, 12 and the dividing surface 15 thereof. In other words, water that may spill from the water pipe 17 or the water pipe attachment part 16a during storage of the mold may flow down the outside surface of the mold, but the water may not reach the mold dividing surface 1.
Since the moisture flows down into the drainage groove section 20 provided along the drain groove section 5, the water does not flow from the drainage groove section 20 toward the dividing surface 15 side, and therefore, water does not enter into the mold surface from the dividing surface 15. is prevented.

The drainage groove portion 20 may be formed along the entire circumference of the mold parting surface 15 so as to surround it, as shown in FIG. It is also possible to form an inverted U-shape along the dividing surface 15 only on the upper and side portions of the outer surface of the mold.

4 to 6 relate to other embodiments.

Fig. 4 shows a part 18 outside the drain groove part 20 on the outer surface of the mold parts 11A, 12A formed into an inclined surface that becomes lower toward the drain groove part 20, and Fig. 5 shows a drain groove part 20 on the outer surface of the mold parts 11B, 12B. The inner portion 19 is also configured to have an inclined surface that becomes lower toward the drain groove portion 20. Configuring part or all of the outer surface of the mold part to be an inclined surface that becomes lower toward the drain groove as in these examples has the advantage that water and water droplets adhering to the outer surface of the mold part can quickly flow down to the drain groove. be.

Further, as shown in the figure, the drain groove section is generally configured in the shape of a concave groove having an inner bottom surface, but as shown in the mold sections 11C and 12C shown in FIG.
It is also possible to form a linear drain groove 21 at the joint position of the outer inclined surface 18 and the inner inclined surface 19. The embodiment shown in FIG. 6 has the advantage that it has a high effect of draining water into the drainage groove portion and also facilitates groove machining.

(Effects) As explained in the embodiments above, in this invention, in a split mold that can be divided into a plurality of mold parts, the water pipe attachment part of the mold part in which the cooling water channel is installed and its dividing surface are connected. Since a drainage groove part is formed on the outer surface of the mold part in between along the dividing surface, water adhering to the outer surface of the mold part when removing the water pipe or draining water during storage of the mold runs along the outer surface and drains into the dividing surface. This prevents the particles from entering the cavity. Therefore, it is possible to prevent the mold surface of the cavity from being soiled or corroded, which is a great advantage in terms of mold storage. Furthermore, when the mold is stored in a humid environment, water droplets that condense on the surface of the mold as it cools can be disposed of by flowing down into the drain, as described above. For example, injection molds often have a multi-layer metal structure such as a three-layer structure with a stripper plate, etc., and this idea is designed to reduce the amount of water on each dividing surface in such a multi-layer structure. It can also be used to prevent intrusion.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view of a plastic molding die showing an embodiment of this invention, Fig. 2 is a front view seen from the arrow 2 side in Fig. 1, and Fig. 3a is a front view seen from the dividing plane. Fig. 3b is a front view showing another example, Fig. 4 is an enlarged front view of the main part showing the mold part with the outer surface of the drain groove section being an inclined surface, and Fig. 5 is an enlarged front view of the main part showing the outer surface of the drain groove section and the mold section. FIG. 6 is an enlarged front view of the main part showing a mold part whose inner surface is an inclined surface, and FIG. . 11, 12, 11A, 12A, 11B, 12
B, 11C, 12C...Mold part, 15...Dividing surface, 16...Cooling water channel, 16a...Water pipe attachment part, 17...Water pipe, 18, 19...Slope surface, 2
0,21...Drainage groove part.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a split mold that can be divided into a plurality of mold parts, a part of the mold part that has a cooling water channel installed therein between the water pipe attachment part of the mold part and the split surface is provided with a A split mold for plastic molding, characterized in that a drainage groove is formed along the mold. 2. The split mold for plastic molding according to claim 1, wherein part or all of the outer surface of the mold portion is formed into an inclined surface that becomes lower toward the drainage groove portion. 3. The split mold for plastic molding according to claim 1 or 2 of the utility model registration claim, wherein the drainage groove portion is configured as a concave groove. 4. The split mold for plastic molding according to claim 2, in which the drainage groove portion is formed linearly at the joining position of the inclined surfaces.