JPS604732Y2 - mold for molding - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a molding die used when molding synthetic resin, rubber, or the like.

Conventionally, when manufacturing manufactured products from synthetic resin or rubber, etc.
A single mold or a pair of inserts are used for a molded product of one type of shape, and when molding an irregularly shaped product, it is necessary to replace the mold with a separate mold or insert.

Therefore, when molding products with many different shapes, molds or inserts are required depending on the number of types, and the materials and manufacturing man-hours for the molds or inserts for that number are required. However, in order to store unused molds or inserts, a storage space and protective equipment against damage or corrosion are required, which is a problem.

This invention solves the above-mentioned problems and allows the use of only one mold when molding products with many different shapes, eliminating the need for materials for molds or inserts that were previously required. The purpose of the present invention is to provide a molding die that significantly reduces the number of manufacturing steps and minimizes the storage space and protective equipment against damage or corrosion.

The gist of this invention is a molding die in which inserts are arranged in a fixed mold and a movable mold, respectively, and multiple types of cavities are formed when the mold is closed by changing the relative surfaces of a pair of inserts, Each of the pair of inserts has a shape with at least two flat parts on the outer circumferential surface, and mold surfaces for cavities that correspond to each other and form a predetermined cavity for closing the mold are formed, and a fixed mold and a movable mold are formed. The mold is formed with an insert receiving part in which a pair of inserts can be placed with the mold surfaces for predetermined cavities facing each other, and the pair of inserts are inserted into the insert receiving parts of the fixed mold and the movable mold in the predetermined positions. A molding die, characterized in that it is fixed to a fixed mold and a movable mold by insert supports that are arranged with their cavity mold surfaces facing each other and are detachably fixed to the fixed mold and the movable mold, respectively. It is in.

An embodiment of this invention will be described below with reference to figures.

Fig. 1 is a sectional view of a mold in which an embodiment of this invention is used in an injection molding machine, Fig. 2 is a plan view showing the movable mold shown in Fig. 1, and Fig. 3 is a cross-sectional view of the mold shown in Fig. 1. It is an AA sectional view of a child.

The molding die of this embodiment includes a sprue 10, an extrusion pin 1
The mold is comprised of a fixed mold 1 and a movable mold 2, each having a fixed mold 1 and a runner 12, and a pair of inserts 3 and 4, respectively.

The insert 3 on the fixed mold 1 side and the insert 4 on the movable mold 2 side are each shaped like a regular hexagonal column with six flat parts 30, 40 on the outer periphery, and when in use, the six flat parts on the outer periphery are formed on the mold dividing surface 14. When the predetermined surfaces of the parts 30 and 40 are in contact with each other, cavities 5 of six different shapes can be formed, and the gate 13 and the tip of the runner 12 can be formed to inject the molding material into the cavities 5. In order to be able to do so, the six flat parts 30 and 40 on the outer circumferential surfaces of the inserts 3 and 4 are provided with cavity mold surfaces 3 a t 4 a z gate recesses 13 a and 13 b and runner recesses 12 a each having a predetermined shape. ,1
2b is taking shape.

The fixed mold 1 and the movable mold 2 each have a concave shape corresponding to the outer peripheral shape of the inserts 3 and 4 so that the inserts 3 and 4 can be placed with their predetermined cavity mold surfaces 3a and 4a facing each other. Nested receiving portions 15a and 15b are formed.

In addition, the fixed mold 1 and the movable mold 2 are provided with insert receiving portions 15a and 15b with predetermined cavity mold surfaces 3a and 4a facing each other.
In order to fix the inserts 3 and 4 arranged in the inserter receiving part 1
Insert supports 6 and 7 are provided at the rear of 5a and 15b, respectively.

The nest supports 6 and 7 are removably fixed to the fixed mold 1 and the movable mold 2 by tightening bolts 8 and 9, respectively.
By tightening the tightening bolts 8 and 9, the inserts 3 and 4 disposed in the insert receiving portions 15a and 15b are moved by using the inclined surfaces in contact with the fixed mold 1 and the movable mold 2, respectively. The fixed mold 1 and the movable mold 2 are held in position while being biased toward the right in FIG.

When manufacturing a molded product with a predetermined shape, first inserts 3 and 4 are
The fixed mold 1 and the movable mold 2 are inserted into the fixed mold 1 and the movable mold 2 by placing the respective inserts 3 and 4 with their predetermined cavity mold surfaces 3a and 4a facing each other so that the mold surfaces 3a and 4a for the predetermined cavities meet when the mold is closed. It is arranged in the child receiving part 15ai5b, and the nest supports 6 and 7 are fixed with bolts of 8.9 m.

After that, the mold was closed and the injection molding machine (not shown) was used.

), the molding material injected from sprue 10, runner 1
2, it is injected into a cavity 5 of a predetermined shape through a gate 13, molded, and released from the mold, thereby producing a desired molded product.

When molding products of other shapes, tightening bolts 8,
9 to remove the insert supports 6 and 7 from the fixed mold 1 and the movable mold 2, respectively, and move the inserts 3 and 4 so that the desired cavity mold surfaces 3a and 4a of the inserts 3 and 4 face each other. Re-arrange it to the insert receiving parts 15a, 15b, and insert the insert supporter 6.
, 7 are fixed by tightening the bolts 8.9, the inserts 3 and 4 are fixed to the fixed mold 1 and the movable mold 2, respectively, and molding is performed in the same manner as described above.

Therefore, in the molding die of the embodiment, the pair of inserts 3,
With only one mold consisting of a fixed mold 1 and a movable mold 2, each of which has a fixed mold 1 and a movable mold 2, a predetermined mold surface 3a for a cavity among the six types of mold surfaces 3a and 4a for the cavities of the inserts 3 and 4, respectively. , 4a facing each other, it is possible to mold six types of molded products, and instead of the conventional molds that required molds or inserts depending on the number of types of molded products to be molded, only one
, only one mold is required, and the materials and manufacturing man-hours required for the mold or insert, which were conventionally required, can be significantly reduced, and there is also a storage space for the mold or insert, and measures such as protection against damage or corrosion. can be kept to a minimum.

In the examples, an injection molding mold is shown as the molding mold, but of course, this invention is not limited to injection molding molds, and can be applied to transfer molding and compression molding molds. can also be applied.

Further, in the embodiment, regular hexagonal columnar inserts are shown as the inserts 3 and 4, but each of the pair of inserts disposed in the fixed type and the movable type each has at least two flat parts on the outer peripheral surface. If mold surfaces for cavities that form a predetermined cavity when the mold is closed are formed in correspondence with each of these flat parts, the cross section can be formed not only into a regular hexagonal column but also into a regular pentagon, rectangle, regular triangle, etc. It may be shaped like a barrel.

In addition, each of the pair of inserts is shaped like a regular hexagonal prism or a regular pentagonal prism as in the embodiment, with the central part of the cross section bulging, and the insert receiving portion 15a of the fixed mold 1 or the movable mold 2 is 1
If 5b is formed into a recess corresponding to the outer circumferential shape of the insert, there is no need to consider the fall of the insert, and as shown in the example,
It can be held only by the insert support that urges the runner 12 side.

By the way, if the cross section of the insert is not as described above and there is a risk that the insert may fall, the conventional method of dropping the insert cross section and the fixed or movable type or insert support This can be dealt with by creating unevenness to prevent it.

As described above, the molding die according to this invention has inserts arranged in each of the fixed mold and the movable mold, and by changing the relative surfaces of the pair of inserts, multiple types of cavities can be formed when the mold is closed. A molding die to be formed, in which each of the pair of inserts has a shape having at least two flat parts on the outer circumferential surface, and each flat part corresponds to each other and forms a predetermined cavity when the mold is closed. A mold surface for the cavity is formed, and the fixed mold and the movable mold are formed with mold receiving portions in which the pair of inserts can be placed, respectively, with predetermined mold surfaces for the cavity facing each other. The fixed mold and the movable mold are arranged so that the mold surfaces for the predetermined cavities are opposed to the mold receiving parts of the fixed mold and the movable mold, respectively, and are fixed to the fixed mold and the movable mold by a mold support that is detachably fixed to the fixed mold and the movable mold. It is fixed in the mold.

Therefore, a mold for a cavity is created in which a pair of inserts each has a shape with n (n≧2) flat parts, and a predetermined cavity is formed when the mold is closed, corresponding to each of the n flat parts. By shaping the molding surfaces, removing the insert support, and rearranging the pair of inserts into the fixed and movable molds so that the mold surfaces for the desired cavity face each other and molding, n types of molded products can be produced. When molding n (n≧2) types of shapes, only one mold is required, which means that only one set of mold or insert material is needed, and the number of manufacturing steps is also (n -1) Since it is only necessary to add the man-hours for machining the cavity mold surfaces of the inserts for a set, the materials and manufacturing man-hours for n molds or inserts, which were conventionally required, are reduced.

In addition, storage space for storing (n -1) molds or inserts, protective equipment against damage or corrosion, etc. are no longer required, and the storage space and protective equipment etc. can be kept to a minimum. arise.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a mold in which an embodiment of this invention is used in an injection molding machine, Fig. 2 is a plane part of the movable mold shown in Fig. 1, and Fig. 3 is a cross-sectional view of the insert A- It is an A sectional view. 1... Fixed type, 2... Movable type, 3, 4
...Insert, 3a, 4a...Mold surface for cavity, 5...Cavity, 6,7...
- Insert support, 15a, 15b... Insert receiving part, 30, 40... Plane part.

Claims (1)

[Scope of utility model registration request] A molding die in which a fixed mold and a movable mold are respectively provided with inserts, and a plurality of types of cavities are formed when the mold is closed by changing the relative surfaces of the pair of inserts, the pair of inserts Each of the fixed and movable molds has a shape including at least two flat parts on the outer circumferential surface, and mold surfaces for cavities are formed in correspondence with each other to form a predetermined cavity when the mold is closed, and the fixed mold and the movable mold Insert receiving portions are formed in which the pair of inserts can be placed respectively with predetermined mold surfaces for the cavity facing each other, and the pair of inserts include:
The fixed mold is disposed with the predetermined mold surfaces for the cavity facing the mold receiving parts of the fixed mold and the movable mold, respectively, and is removably fixed to the fixed mold and the movable mold, respectively. and a molding die, characterized in that it is fixed to a movable mold.