JPH0349862Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention relates to an improvement of the mold part of a hot press used for molding plastics, etc.

(2) Prior Art Conventionally, a hot press 1 as shown in FIG. 8 has been used for molding plastics and the like. 2 is a mold, which has a heating source inside;
As shown in the figure, it is in contact with an external heating plate 7. Reference numeral 3 denotes a heat insulating material connected to the heating press 1a in order to prevent thermal influence on the main body and increase thermal efficiency.

A molding material is supplied between the molds 2a and 2b, and is heated and pressurized. Alternatively, the mold may be closed and the material injected into the heated cavity.

In addition to the ones shown in the drawings, there are other hot presses that are equipped with a material injection mechanism, an ejector, a take-out device, etc., and those that are equipped with a pressure mechanism on the upper side.

Electricity, steam, hot oil, hot water, etc. are used as the heat medium.

(3) Problems In order to manufacture high-quality products by hot pressing, it is desirable that the heat distribution in the mold be uniform.

However, although the heat from the heating plate or mold is radiated toward the molding material or the outside world, the heat is not uniformly radiated from the entire surface of the heating plate or mold. Therefore, the heat distribution always tends to be non-uniform.

Furthermore, when the temperature is suddenly raised or lowered, or when a heat generating section such as a cartridge heater uses a local heating source, the heat distribution tends to become non-uniform.

Such drawbacks become more pronounced as the thermal conductivity of the material of the heating plate or mold becomes lower. However, on the other hand, materials with good thermal conductivity are expensive and, moreover, lack the pressure resistance required in pressing operations, so they are faced with the dilemma of being difficult to use for heating plates or molds.

B. Structure of the invention (1) Means for solving the problems The mold part of the heating press according to the invention receives heat from the heat insulating material connected to the main body of the heating press, the mold, and the heating source. This heating plate is made of a material with higher thermal conductivity than the mold, and the heat receiving plate does not directly or indirectly transfer the heat to the mold. It is placed between the heat insulating material and the mold to ensure uniform heat distribution.

The thickness of the heat equalizing plate may be appropriately selected depending on the size of the heating source, that is, the amount of heat transferred, the size of the heating plate or the mold, etc.

Steam, hot water, hot oil, etc. are not easily available as heat media because they require generation and circulation equipment. Electricity is readily available. Among electric heaters, sheathed heaters are advantageous in terms of heat distribution, but have a problem with pressure resistance, and cartridge heaters are ultimately the easiest to use.

(2) Effect When the heating press is operated, the heat from the heating source is transferred to a heat-uniforming plate with good thermal conductivity, making the heat distribution uniform, and the mold is directly or indirectly transferred from this heat-uniforming plate. heat is transferred to the mold, ensuring uniform heat distribution in the mold. Further, the force during the pressing operation is applied to the entire portion of the heat equalizing plate that is directly or indirectly sandwiched between the mold and the heat insulating material.

(3) Examples In the drawings, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, the mold part 5 of the hot press includes a heat insulating material 3 connected to the hot press main body 1a,
A mold 2 and a soaking plate 4 that receives heat from a heating source
It consists of The heating source is built into the mold 2.

The heat soaking plate 4 is made of a material with higher thermal conductivity than the mold 2. Copper and aluminum are suitable as such materials, and have a thermal conductivity about five times higher than that of iron. The soaking plate 4 is the back surface 21 of the mold 2
It is interposed between the heat insulating material 3 and the mold 2 so as to be in contact with the entire area.

The heat transferred from the heating source in the mold 2 to the heat equalizing plate 4 flows so as to uniformize the heat distribution of the heat equalizing plate, which has good thermal conductivity, and this heat is directly transmitted to the entire back surface of the mold. Uniform heat distribution in the mold.

The embodiments shown in FIGS. 2 and 3 use a heating plate 7 having a heating source therein.

In the example shown in FIG. 2, a heating plate 7 is interposed between the heating plate 4 and the heat insulating material 3, and the heat from the heating plate 7 is transmitted to the mold 2 via the heating plate 4.

In the example shown in FIG. 3, the positions of the heating plate 7 and the soaking plate 4 are swapped, so that the front surface of the heating plate 7 contacts the entire back surface 21 of the mold 2, and the heat soaking plate 4 contacts the entire back surface of the heating plate. are doing. In this case, part of the heat from the heating plate 7 is directly transferred to the mold 2, but the rest is transferred to the heat equalizing plate 4 to make the heat distribution uniform, and the heat is further transferred indirectly via the heating plate 7. is transmitted to the mold 2.

In the example shown in FIG. 2, compared to the example shown in FIG. 3, there is a problem that the heat equalizing plate 4 is easily changed temporarily during heat transfer, and the hardness of the heat equalizing plate is insufficient. It is desirable to place the steel plate in the contact surface with the mold 2.

In FIG. 4, the heating source is located inside the mold 2, as in the embodiment shown in FIG. It is set as. This further improves the heat distribution conditions.

FIG. 5 shows an example in which similar changes have been made to the example in FIG. 2, and FIG. 6 shows an example in which similar changes have been made to the example in FIG.

Figure 7 is a modified version of the example in Figure 3.
An example is shown in which a heat equalizing plate 4 is also interposed between the side surface of the heating plate 7 and the heat insulating material 3.

C. Effect According to the present invention, the heat received by the heating plate from the heating source is transmitted directly or indirectly to the mold through the heating plate, making the heat distribution of the mold uniform, so that the heating press This makes it possible to manufacture high-quality products.

In addition, since the heating plate can have a flat surface, it is easy to apply the force during pressing work evenly to the entire part of the heating plate sandwiched between the mold and the heat insulating material. Since the thickness of the heating plate can be determined depending on the size of the heating plate, it is possible to ensure a sufficient pressure resistance.

Furthermore, since the expensive material with good thermal conductivity is used only for the heating plate, the amount used is small, and the heating plate can be formed into a plate with a flat surface, making it easy to process, thus reducing costs. can be kept low.

[Brief explanation of the drawing]

1 to 3 are front views showing different embodiments of the mold section according to the present invention, FIGS. 4 to 7 are sectional views showing different embodiments of the same, and FIG. 8 is a conventional one. FIG. 9 is a front view of the same mold section. 1 = press device, 1a = main body of the press device,
2, 2a, 2b=mold, 3=insulating material, 4=heating plate, 5=mold part, 7=heating plate, 21=back surface of the mold, 22=side surface of the mold.

Claims (1)

[Claims for Utility Model Registration] (1) The heating press has a heat insulating material connected to the main body, a mold, and a heat equalizing plate that receives heat from the heating source, and the heat equalizing plate The heat insulating material and the mold are made of a material with better thermal conductivity than the mold, and the heat absorbing plate is made of a material that has better thermal conductivity than the mold, and the heat insulating material and the mold are arranged so that the heat received by the heat soaking plate is transferred to the mold and the heat distribution of the mold is uniform. The mold part of the heating press is installed between the (2) The mold part according to claim 1 of the utility model registration claim, in which the heat-uniforming plate is in contact with at least the entire back surface of the mold. (3) A claim for utility model registration in which the surface of a heating plate having a heating source as described above is in contact with at least the entire back surface of the mold as described above, and the heating plate as described above is in contact with at least the entire back surface of the heating plate. The mold part described in item 1.