JP2527970Y2 - Injection mold - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The invention relates to a mold for injection molding.

<Prior Art> Conventionally, as a mold for injection molding, a plurality of male and female dies are provided on opposing surfaces of receiving plates provided opposite to each other, and a space (cavity) formed in the closed male and female dies is provided. It is known that a molding machine is filled with molten resin through an orifice (nozzle, sprue, gate) by an advance pressure of an injection plunger or a screw, and a plurality of molded products are taken.

<Problem to be Solved by the Invention> However, the conventional multi-cavity injection molding mold has stepped portions 120 and 220 as is clear from the partially enlarged sectional view of FIG. 4 and the partially enlarged plan view of FIG. The molds 300, 4 in which a required number of through holes 310, 410,.
The male and female molds 110, 210,... Are fitted into the molds 300, 400 using 00, and the fitting surfaces of the molds 300, 400 are attached to the receiving plates 100, 200 as mounting surfaces, and the male and female molds 110, 210,. Therefore, the following adverse effects were caused.

(A) Forming a large number of through-holes 310 ..., 410 ... according to the shapes of the male and female molds 110 ..., 210 ... in the molds 300, 400 by cutting or the like is very troublesome, and the molds whose size is particularly limited The operation of forming a large number of female molds 110 or male molds 210 on the plate surface of the frame requires a lot of skill,
It was troublesome.

(B) The mold frames 300, 400 are continuously provided only with the surplus portions 320, 420 where the through holes 310, 410,.
When the through holes 310 ... or 410 ... are formed too close to each other, the molds 300, 4
The strength of No. 00 was weakened, and there was a problem that the strength at the time of opening and closing the mold could not be tolerated.

(C) The position adjustment of male and female molds 110 and 210 after insertion from the back of molds 300 and 400 and assembly into mold A ', or replacement of a faulty part, etc., may be performed for only one mold. Prior to adjustment and replacement, molds 300 and 400 are used for mold A '
Adjustment and replacement could not be done without removing it from it, which was troublesome.

(D) The temperature of the male and female molds 110 and 210 in the central part of the mold A 'was significantly higher than that of the surrounding area, causing variations in molded products.

This invention was devised in view of the harmful effects of these conventional injection molds, and the work of assembling the male and female molds into the mold is easy, and the male and female molds with a large number of pieces are efficiently mounted on a limited mounting surface. It is intended to provide a molded product that can be formed favorably, can easily adjust the position of the male and female molds after being assembled into the mold, or replace a failed part, and can obtain a good molded product without variation.

<Means for Solving the Problems> The structure of the injection molding die of the present invention for solving the problems described above includes a plurality of male and female dies that are respectively fixed on the facing surfaces of receiving plates provided opposite to each other. A plurality of female dies or male dies are provided on the opposite surface side of each receiving plate, and can be fitted into a gap between the dies, and the receiving plate is provided. The female or male type is fixedly mounted on the opposite surface side of the receiving plate by fitting and attaching a unit block body detachably provided from the male and female type opposing surface side. The means for detachably fixing to the receiving plate is operable from the side of the male and female opposing surfaces.

<Operation> According to the injection molding die of the present invention having the above-described structure, the receiving plate is opposed to the receiving plate by fitting the unit block body which can be inserted into the gap between the male and female dies and is detachably provided on the receiving plate. The male and female molds respectively arranged on the surface side can be fixed on the receiving plate surface.

In addition, the position adjustment of the male and female molds after assembly into the mold or the replacement of faulty parts, etc. can be performed by loosening only the unit block body that has been inserted into the mold requiring position adjustment or replacement, or by removing it from the receiving plate. , Can be adjusted or replaced.

Since the male and female molds arranged on the receiving plate are fixed in position by the unit block body, a gap can be formed between the molds, and the air and the like can be easily distributed, and the heat at the central male and female mold parts in the multi-cavity mold can be improved. The temperature distribution of the mold can be averaged while suppressing the rise.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a partially enlarged cross-sectional view of the injection mold of the present invention, and FIG. 2 is a partially schematic plan view.

The mold A has a pair of receiving plates 1 and 2 which are provided on the moving side or the fixed side provided opposite to each other.

On the opposing surfaces of the receiving plates 1 and 2, female dies 10, 10, and male dies 20, 20.
… And 22,22….

Reference numerals 13 and 23 denote dowel pins for fixing the spacer blocks 12 and 22 to the receiving plates 1 and 2.

Steps 11, 11,... And 21, 21,... Are formed on the outer peripheral surfaces of the female dies 10, 10,. Steps 31 and 41
Are fixed to the receiving plates 1 and 2 with the female dies 10, 10... And the male dies 20, 20,.

Reference numerals 3 and 4 denote unit blocks inserted in the gaps between the female dies 10, 10... And the male dies 20, 20,.

The unit block bodies 3 and 4 are formed with a step 31 that fits with the step 11 formed on the outer peripheral surface of the female die 10 and the male die 20, and a step 41 that fits with the step 21, respectively. ing.

Further, the unit block bodies 3 and 4 are detachably mounted and fixed to the receiving plates 1 and 2 by bolts 32 and 42 having a concave portion for inserting a hexagon wrench in the head.

The female mold 10 and the male mold 20 are attached to the receiving plates 1 and 2 by fitting the unit blocks 3 and 4 to the receiving plates 1 and 2 with the bolts 32 and 42 through fitting between the steps. Fixed.

Reference numeral 5 denotes a guide pin for determining the relative positions of the male and female molds 10 and 20, and is fitted in parallel with the moving direction of the mold A. C indicates the cavity formed between the closed male and female molds 10 and 20.

The sprue, runner, gate and the like for guiding the molten resin filled in the mold A to the cavity C by the forward pressure of the injection plunger or screw from the molding machine can be appropriately implemented by a conventionally known one. The upper part is omitted.

Describing the assembling of the mold, the male and female dies 10, 10,... And 20, 20,.

Next, the male and female dies 10,10 ... and 20,
Insert the unit blocks 3 and 4 into the gap between 20 and
… And the male molds 20, 20, are adjusted, and then the step portions 31, 41 of the unit block bodies 3, 4 are formed on the outer peripheral surfaces of the female molds 10, 10, respectively. , Is fitted to the steps 21, 21 formed on the outer peripheral surface of the male molds 20, 20, and bolts 32, 42
The unit blocks 3 and 4 are fixed to the receiving plates 1 and 2. By fixing the unit block bodies 3 and 4 to the receiving plates 1 and 2, the male and female dies 10, 10.
Are fixed to the receiving plates 1 and 2.

In the above-mentioned conventional male and female mounting structure using a mold, when a disk-shaped male and female die with an outer diameter of 123 is used, the center pitch between adjacent dies is limited to being formed close to 130 mm. However, in the case of the male and female type mounting structure using the unit block body, the types are the same in diameter, and they are arranged in contact with each other, and the contact outer peripheral surface is slightly flattened. By contact, the molds could be mounted next to each other with the center pitch of 120 mm and a maximum of 116 mm adjacent to each other. As a result, in the case of the conventional eight mounting plates, twice as many 16 male and female dies were respectively disposed on the receiving plate surface and mounted and fixed.

In addition, when injection molding was performed using a mold set with respective receiving plates to which the above 16 male and female dies were attached,
As shown in FIG. 3, 16 good molded products S were obtained.

In the above embodiment, the step formed in the unit block body is fitted to the step formed in the male and female type, and the example in which the position of the male and female type is fixed to the receiving plate is shown. You may implement by a well-known fitting mechanism. Further, although the embodiment has been described in which the unit block body is fixed to the receiving plate with a bolt having a recess for inserting a hexagon wrench in the head, other known fixing means may be used as appropriate. In addition, various design changes can be made within a range that does not change the gist of the present invention, such as that the shape of the male and female molds can be appropriately formed.

<Effects of the Invention> According to the injection molding die of the present invention having the above-described configuration, the male and female molds respectively arranged on the facing surfaces of the receiving plates provided opposite to each other are provided without the form frame. It is also possible to arrange the female molds and the male molds in contact with each other, and to fit the unit block into the gap between the molds and fix it to the receiving plate. A larger number of male and female dies can be arranged and fixed on the surface with good space efficiency than conventional dies, and therefore a larger number of multiple dies can be obtained. In addition, the work of assembling the male and female molds into the mold becomes easy, and the mold can be formed without disassembling the mold during maintenance work such as adjusting the position of the male and female molds after the assembly into the mold or replacing defective parts. It is extremely easy to adjust the position from the opposite sides of the male and female molds, or to loosen only the unit block that is inserted into the mold that needs to be replaced or remove it from the receiving plate even when it is attached to the machine. Can be adjusted or replaced.

Therefore, according to the present invention, it is not necessary to form a large number of through-holes in the mold according to the shape of the male and female molds as in the above-described conventional mold. Even if the dies are brought into contact with each other and arranged on the receiving plate surface, the dies can be sufficiently fixed in the unit block body at the surplus part, and a large number of male and female dies can be It can be arranged. For this reason, for example, a receiving plate having the same size as the receiving plate of the conventional type having eight pieces can be formed into 16 pieces in the present invention, and the productivity is doubled.
In addition, even when adjusting the position of the male and female molds after assembling into the mold or replacing a faulty part, the adjustment,
Prior to the replacement, a troublesome operation such as removing the mold from the molding machine and disassembling the mold and removing the mold frame from the mold each time is unnecessary, and the maintenance work efficiency can be improved at once.

In addition, since the male and female dies arranged on the receiving plate are fixed at the unit block body instead of being attached to the receiving plate which is fitted into the mold frame as in the conventional mold, there is no gap between the dies. Can be formed, the flow of air etc. can be improved, the heat rise in the central male and female mold parts in the multi-cavity mold can be suppressed low, the temperature distribution of the mold can be averaged, and the center generated in the conventional mold can be Various practical effects, such as the ability to prevent product variations between the part and its surroundings, have been achieved, and these effects become more pronounced as the size of the mold increases due to an increase in the number of molded products. .

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of the injection molding die of the present invention, FIG. 2 is a schematic plan view, FIG. 3 is a perspective view showing a molded product, and FIG.
FIG. 5 and FIG. 5 are a partially enlarged sectional view and a schematic plan view showing a conventional example, respectively. A, A ': Mold, 1,2,100,200 ... Receiving plate, 10,110 ... Female, 20,210 ... Male, 3,4 ... Unit block

Claims (1)

(57) [Scope of request for utility model registration] 1. An injection molding die for molding a large number of molded articles by a plurality of male and female dies, each of which is fixed on an opposing surface side of a receiving plate provided opposite to each other. A plurality of female molds or male molds are respectively arranged on the surface side, and the above-mentioned fitting is carried out by fitting and attaching a unit block body which can be inserted into the gap between the molds and is detachably provided on the receiving plate from the male and female mold facing surface side. The female or male type is fixed on the opposite surface side of the receiving plate, and means for detachably fixing the unit block body to each receiving plate can be operated from the male and female opposite surface side. Mold for injection molding.