JPH0443291Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a resin mold that can be used for both compression molding and injection molding of resin.

[Conventional technology]

In general, injection molding methods and compression molding methods are widely used as resin molding methods, and these methods have been used appropriately depending on the material, application, production scale, etc.

To briefly describe the molds used in these methods, the injection mold is a female mold having a cavity part 1 having a molding recess and a spool part 2 opening into the cavity part 1, as shown in FIG. 3 and a male mold 5 having a core portion 4 made of a molded protrusion, the upper contact surface 6 of the female mold 3 and the lower contact surface 7 of the male mold 5 are brought into close contact with each other, and a spool portion is formed. A molten material is press-fitted from 2 to form the product 10 and the material 11 filled in the spool part 2 integrally, and later the material 11 in the spool part 2 is removed to obtain the product 10.

Further, as shown in FIG. 8, the compression molding mold is composed of a female mold 16 having a cavity portion 15 and a male mold 18 having a core portion 17 consisting of a molded protrusion corresponding to the cavity portion 15. After the material is loaded between the core part 17 and the cavity part 15, the molds 16 and 18 are brought together to a predetermined position to compress the material and obtain the product 10. The excess material is then pushed out of the mold by a cut-off section 20 formed with a narrow gap.

As mentioned above, the injection molds 3 and 5 require the spool portion 2 and the upper and lower contact surfaces 6 and 7, and the compression molds 16 and 18 require the cutting portion 20, so both molds are They cannot be shared; each type is manufactured exclusively for its own use.

However, in order to determine the material and production method for a product, it is generally necessary to compare and evaluate various molding methods, so injection molding molds and compression molding molds have been made separately and comparative studies have been performed. This has resulted in the disadvantage of being extremely wasteful both economically and in terms of time.

As a device for solving such inconveniences, a device disclosed in Japanese Utility Model Application Publication No. 120109/1988 is known. This is a mold for a box-shaped product, and the female mold consists of a bottom plate block and four side plate blocks. The side plate blocks are arranged in sequence so that one end of another side plate block is in close contact with the surface forming the cavity, and one end of another side plate block is in close contact with the surface forming the cavity thereof, and each side plate block is arranged so that the bottom plate is connected to the side wall. This mold has a female mold that can slide in parallel and perpendicular directions.

[Problem that the invention attempts to solve]

However, the mold disclosed in the above-mentioned Japanese Utility Model Publication No. 59-120109 is superior to the conventional dedicated mold in that the wall thickness can be changed in various ways by moving the side plate block, but it is different from the common mold in terms of the molding method. However, there are problems that the above-mentioned inconveniences cannot be solved.

[Means for solving problems]

The present invention was developed to solve the above-mentioned conventional problems, and its purpose is to provide a product that can be used in both injection molding and compression molding methods. consists of a female mold having a cavity portion and a closable spool portion, a male mold having a core portion and a columnar portion extending from the core portion, and an eclipse between the columnar portion that fits into the columnar portion and is attached to the female mold. A resin molding comprising: a cutting member that forms a cut portion; and an intervening member that is replaceable with the cutting member that fits into the columnar portion, is fixed in a male shape, and abuts around the cavity opening. It's in the mold.

〔Example〕

The details of the present invention will be explained below with reference to the embodiments shown in FIGS. 1 and 2. Note that FIGS. 1 and 2 show a first embodiment, with FIG. 1 showing an injection mold and FIG. 2 a compression mold.

This embodiment as an injection mold shown in FIG.
It is composed of a female mold 21, a male mold 22, and an intervening member 23, and the female mold 21 has a cavity part 25,
and a spool portion 26, and a cavity portion 2.
5 is provided with a molding recess 28 having a circular cross section and a slightly larger diameter near the opening 27, which determines the outer shape of the product 30 to be molded.

Further, the spool portion 26 consists of a bush 32 having a flange 31, and the cavity portion 25
, and its end reaches the molding recess 28 . Although not shown in the drawings, the flange 31 is formed with an engagement recess 33 for aligning a spout for spouting the melted material, and a spool 34 through which the melted material is passed passes through the center of the engagement recess 33.
The lower end opens into a molding recess 28 . Furthermore, a flat upper contact surface 35 is formed in the cavity portion 25 so as to surround the opening 27 of the molded recess 28 .

On the other hand, the male die 22 includes a core portion 41 with a circular cross section that determines the inner shape of the product 30, and a columnar portion 43 with a circular cross section that extends coaxially through a step portion 42,
The flat end surface 44 of the step 42 forms the open end of the product 30.

The intervening member 23 is made of an annular member and is attached to the columnar section 43 by fitting into it, and has a flat lower abutting surface 50 on its upper surface, and is detachable from the columnar section 43 with a bolt. It is fixed freely. The lower contact surface 50 is attached to the columnar portion 43 so as to be on the same plane as the flat end surface 44, and contacts the upper contact surface 35 of the female mold 21 to hold the mating portion 51 of both molds 21 and 22. Form.

When this is used as an injection mold, the upper contact surface 35 and the lower contact surface 50 are connected as shown in the figure.
(The illustration and description of these mechanisms are omitted), and then the molten material is jetted and supplied from the spool 34 to form the cavity formed by the molding recess 28, the core part 41, and the step part 42. After solidification, the product 30 is obtained.

Next, the case of the compression mold shown in FIG. 2 will be described. Note that the same parts of the compression molding mold corresponding to the injection molding mold are given the same numbers.

The compression molding mold differs from the injection molding mold only in the spool portion 26 and the spool portion 53, and the intervening member 23 and the cutting member 54, and the other parts are the same.

That is, the spool portion 53 does not have a portion that corresponds to the engagement recess 33 or spool 34 of the injection molding die.
It has become a mere blind cover bush 32a. Further, the cutting member 54 is made of an annular member, and is fitted into the columnar member 43, and the upper contact surface 35 and the lower contact surface 50 are combined and fixed to the female die 21 with bolts. It faces the columnar portion 43 with a narrow gap therebetween, forming a cutting portion 56 .

A compression mold with such a configuration, like a normal compression mold, places a material between the core part 44 and the molding recess 28, and compresses the material in the cavity by bringing both dies close together. The product 30 is obtained by molding, and extruding the excess material from the cutting part 56.

Next, a second embodiment will be explained with reference to FIGS. 3 and 4. Note that FIG. 3 shows the main parts of the injection mold, and FIG. 4 shows the main parts of the compression mold.

In the embodiment of the injection mold shown in FIG. 3, the spool portion 61 is provided on the side of the female mold 62, and the molten material is supplied to the molding space 65 through the runner 64 provided on the intervening member 63. This is the case when the water is supplied by injection. In this case, the intervening member 63 is attached to the columnar part 67 of the core part 66 with bolts, and the upper contact surface 68
and the lower contact surface 69 form a mating part.

FIG. 4 shows a case where the compression molding mold is used, and the difference is that a cutting member 70 is used instead of the intervening member 63. This cutting member 70 has a columnar portion 67
It consists of an inner ring body 71 attached to the female die 62 and an outer ring body 72 that closes the spool part 61, and a slight gap between these forms a cutting part 73. are doing. The other parts are the same as those in the first embodiment.

Next, FIGS. 5 and 6 show a third embodiment of the present invention, in which FIG. 5 shows an injection mold, and FIG. 6 shows a compression mold.

This embodiment of the injection mold shown in FIG. 5 also has a case where the spool portion 81 is provided on the side of the female mold 82.
The intervening member 83 is attached to the male die 84, and the molten material is supplied from the tunnel spool 85 between the female die 82 and the male die 84 to obtain the product 30.

FIG. 6 shows the main parts when this embodiment is made into a compression molding mold, and when a cutting member 88 without a tunnel spool 85 is attached to the female mold 82 instead of the intervening member 83 to close the spool part 81.ゝMoni,
A narrow gap is provided between the columnar part 87 and a cutout part 89 is formed. Other aspects are the same as those of the first embodiment, so detailed explanation thereof will be omitted. In this embodiment, a container product with a circular cross section is described, but the product is not limited to this, and any product that can be injection molded or compression molded may be used.

[Effect of idea]

As described above, the resin molding die according to the present invention includes a female mold having a cavity portion and a closable spool portion, a male mold having a core portion and a columnar portion extending from the core portion, and a female mold that fits into the columnar portion. a cutout member that is attached to the columnar part and forms a cutout part between the columnar part;
Since it is composed of the cutting member that fits into the columnar part and is fixed to the male mold and abuts around the cavity opening, and a replaceable intervening member, the male mold,
When the intervening member is combined with the female mold, it becomes an injection mold, and when the cutting member is combined, it becomes a compression mold.

Therefore, there is no need to make separate molds for both molding methods, and there is an effect that a resin mold can be provided which is extremely useful both in terms of time and economy.

[Brief explanation of the drawing]

Figures 1 and 2 show a first embodiment of the present invention. Figure 1 is a cross-sectional front view showing the main parts of an injection mold, and Figure 2 is a cross-sectional view showing the main parts of a compression mold. The front view, FIG. 3, and FIG. 4 similarly show the main parts of the second embodiment. FIG. 3 is a cross-sectional front view of the injection mold, and FIG. 4 is a cross-sectional front view of the compression mold. 5 and 6 similarly show the main parts of the third embodiment. FIG. 5 is a cross-sectional front view of an injection mold, FIG. 6 is a cross-sectional front view of a compression mold, and FIG. 7 is a conventional cross-sectional view. FIG. 8 is a cross-sectional front view of the injection mold, and FIG. 8 is a cross-sectional front view of the compression mold. 21, 62, 82...Female type, 22, 74, 84
... Male type, 25 ... Cavity part, 26, 53,
61, 81...Spool part, 41, 66, 86...
...core part, 43, 67, 87... columnar part, 54,
70, 88... Cutting member, 56, 73, 89...
... Meal cutting section.

Claims (1)

[Scope of utility model registration request] A female mold having a cavity portion and a closable spool portion, a male mold having a core portion and a columnar portion extending from the core portion, and a cutting portion that fits into the columnar portion and is attached to the female mold. What is claimed is: 1. A resin molding mold comprising: a cutting member that forms a hole; and an intervening member that is replaceable with the cutting member that fits into a columnar part, is fixed to a male mold, and abuts around a cavity opening.