JPH03246013A - Mold - Google Patents

Abstract

PURPOSE:To improve a quality of a mold product by equalizing a temperature distribution of a molding part without requiring a long time, by a method wherein one groove drawn around in a fixed route is formed on the opposite side of a molding part of a template, a supporting plate is provided on the surface where the groove is formed and a circulation hole is formed. CONSTITUTION:Since a molding part 3 of a mold 1 is formed on a template 2 and a groove 4A in the opposite side where the molding part 3 of the template 2 is formed is formed before preparation of a support plate to the template, one groove can be set up arbitrarily in a fixed route and a circulation hole 4 which becomes an appropriate temperature distribution is arranged. When a fluid is passed through the circulation hole 4 from an IN side to an OUT side, a temperature of the fluid is spread to the molding part 3 like an isothermal line of an illustration (B). With this construction, temperature distributions of a plane and the side of the molding part 3 become uniform, deficient flailing of a molding material to be cast into the molding part 3 or a deformation of a molded product are avoided and an improvement in a quality can be contrived.

Description

[Detailed Description of the Invention] [Summary] The purpose of this invention is to improve the quality of molded products by uniformizing the temperature distribution in the molding part without requiring a long period of time in a mold that performs molding by controlling the temperature with a fluid. In a molding die in which a molded part formed on a template is heated and cooled by fluid flowing through a flow hole, a groove is formed on the opposite side of the molded part of the template, and is routed along a predetermined path. , a receiving plate is provided on the surface where the groove is formed to form the communication hole.

[Industrial application field]

The present invention relates to a molding die that performs molding by controlling temperature with a fluid.

In recent years, high precision has been required for plastic products, and there is a demand for molds that can reliably inject resin and do not cause deformation during solidification.

Therefore, it is necessary to make the mold temperature uniform and to solidify the filled molten resin at a uniform cooling rate.

[Conventional technology]

FIG. 3 shows a configuration diagram of a conventional molding die. Figure 3 shows
One of the upper and lower molding dies is shown, and the other is constructed in the same way. In the figure, 20 is a template, 21 is a communication hole, and 22 is a molding part.The template 20 has holes 23 for attachment, etc. formed therein. The communication holes 21 are two straight through holes formed from one side of the template 20 to the other side with the molding part 22 in between, and are connected by a vibrator 24 outside the substrate 20. The molding part 22 is formed in a box shape approximately at the center of the mold plate 20, and is combined with the other (upper or lower) mold to form a certain space. Molding material is injected into this space.

FIG. 4 shows a sectional view of the mold, and temperature control during molding will be explained. When a fluid such as water or oil at a predetermined temperature is passed through the IN of the flow hole 21, it is discharged from the 0 (JT) via the vibrator 24 (Fig. 3).In this case, as shown in Fig. 4, the fluid Temperature propagates within the mold plate 20, heating and cooling the molding part 22. That is, by changing the temperature of the fluid, the temperature during molding is adjusted.

[Problem to be solved by the invention]

However, with the arrangement of the above-mentioned flow holes 21, the molded part 22 is heated,
When cooling, the temperature distribution is not uniform on the plane and side surfaces of the molded part 22. That is, in the case of FIG. 4, temperature unevenness occurs on the plane, and if the interval between the communication holes 21 is reduced, temperature unevenness will occur on the side surface. Therefore, there are problems in that the uneven temperature distribution causes insufficient filling and deformation of the molding material, and that it takes a long time to stabilize the temperature.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a molding die that uniformizes the temperature distribution of a molding part without requiring a long time and improves the quality of a molded product.

[Means to solve the problem]

FIG. 1 shows a diagram explaining the principle of the present invention. Figure 1 (A), (
In the molding die 1 of B), 2 is a template. 3 is a molding part, which is formed on the template 2. 4 is a communication hole;
It is formed by providing a receiving plate 5 in one groove 4A that is routed along a predetermined path on the opposite surface of the molding part 3 of the template 2. In addition, 61-64 are attachment holes.

[Effect]

As shown in FIG. 1, on the opposite side of the template 2 where the molding part 3 is formed, Since the JI4 A is formed before the receiving plate 5 is provided on the template 2, one can be arbitrarily set along a predetermined path, and the flow holes 4 that provide an appropriate temperature distribution are arranged.

Furthermore, when fluid is passed from the IN side to the 0tJT side through the communication hole 4, the temperature of the fluid is propagated to the molded part 3 as shown in the equimixture shown in FIG. 1(B). As a result, the temperature distribution on the plane and side surfaces of the molding section 3 becomes uniform, and insufficient filling of the molding material injected into the molding section 3 and deformation of the molded product are avoided, making it possible to improve quality.

(Embodiment) FIG. 2 shows a configuration diagram of an embodiment of the present invention. Figure 2 (A
) is a plan view of the molding die of the present invention, FIG. 2(B) is a side sectional view thereof, FIG. 2(C) is a front sectional view, and FIG. 2(D) is a flow hole. FIG.

In FIGS. 2(A) to 2(C), a concave box-shaped molding portion 3 is formed on the template 2 at approximately the center thereof.

On the opposite surface of the molded part 3, a step 7 is provided at the front and rear, and two O-shaped tips are communicated with each other, and a groove 4A is formed along a path passing below the molded part 3.

Both ends 8^, 8e of this groove 4A are located on one side of the template 2.

Then, the receiving plate 5 is provided on the surface where the groove 4A is formed, with the spacer 9 and the flexible member 10 interposed therebetween. The groove 4A forms the communication hole 4 by the receiving plate 5. Here, the spacers 10 are for preventing the template 2 from bending when the template 2 is mounted and fixed through the mounting holes 61 to 64 at the four corners, and are appropriately arranged. Moreover, the flexible member 10 is
For example, a urethane plate is used. The urethane plate 10 is set to be thicker than the step 7, and when the template 2 is attached, it bends due to tightening and bulges into the groove 4A (
Figure 2 (D)). This ridge functions as a seal when fluid flows into the flow hole 4, and the urethane plate 10 itself functions as a heat insulating material.

Note that the above-mentioned molding die 1 indicates a lower die in the die, and molding is performed, for example, using a die having the same configuration as an upper die. In this case, a resin injection hole is provided in the molding part of the upper mold.

Now, when performing resin molding such as a mold in the molding section 3, oil (for example, 200 ° C.) is supplied from one end 8A of the circulation hole 4.
A fluid such as the like is caused to flow at a relatively high speed, and is discharged from the other end 8B and circulated. Heat from the flow holes 4 is propagated to the molded part 3,
The lower flow hole and the flow holes on both sides make the temperature distribution uniform. Further, due to the heat insulating effect of the urethane plate 10, the temperature does not escape to unnecessary parts, the mold temperature is stabilized, and the time required to reach the set temperature is shortened. Therefore, it is possible to prevent the occurrence of failure in resin filling into the molded part 3 due to temperature non-uniformity.

After filling the resin, when cooling the molded part 3 by flowing water or the like through the flow holes 4, the temperature distribution is uniform and the mold temperature is stable (cooling rate is stable), so that deformation such as warping does not occur and the temperature is high. Accurate molded products can be obtained.

Note that since the flow holes 4 are provided by forming grooves 4A, the route of the grooves 4A can be set arbitrarily, but in order to make the temperature distribution of the molding part 3 uniform, at least It is arranged below and around the lower part of the molding part 3.

〔Effect of the invention〕

As described above, according to the present invention, a groove with a predetermined path is formed on the opposite surface of the molded part formed on the template, and a flow hole is formed by the receiving plate to heat and cool the molded part with a fluid at a predetermined temperature. By doing so, the temperature distribution of the mold for molding can be made uniform without requiring a long time, thereby preventing filling defects and deformation of the molded product, and making it possible to obtain high-precision molded products. can.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, Figure 3 is a configuration diagram of a conventional molding die. FIG. 4 is a sectional view of a conventional molding die. In the figure, 1 is a molding die, 2 is a template, 3 is the molding part, 4 is a communication hole, 4A is the groove; 5 is the receiving plate I'm looking forward to it. U.T. ↑ Configuration diagram of conventional molding die No. figure 121 Cross-sectional view of a conventional molding die Figure 4 (△) (B)

Claims (1)

[Claims] The molded portion (3) formed on the template (2) is connected to the flow hole (4).
), in which a groove (4_A) is formed along a predetermined path on the opposite surface of the molding part (3) of the template (2), and the groove (4_A) is A molding die characterized in that a receiving plate (5) is provided on the surface on which the flow hole (4) is formed.