JP3867571B2 - Resin mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin mold.
[0002]
[Prior art]
In a resin injection molding machine, after the injection molding, separating the runner and the resin molded product, which is the path for injecting the resin into the cavity of the resin mold, and processing the gate (runner processing) is an injection molding process. It is one of the important items for automation and labor saving. Therefore, conventionally, by using a sleep rate mold, when the mold is opened, the molded product and the runner are separated and removed separately, or by using a runnerless mold, the runner processing itself is omitted. Runner processing was performed.
[0003]
However, in the case of insert molding or the like in which resin is injection-molded after an insert product is incorporated in a mold, the place where the gate can be arranged is limited depending on the arrangement of the insert. For this reason, when the position of the gate is arranged on a surface different from the mold opening surface of the mold, the problem is that the runner process cannot be automatically performed by using the sleep rate mold described above. There was a point.
[0004]
In addition, as shown in FIGS. 13 and 14, for example, the runner A and the gate B are disposed on the mating surfaces of the two slide cores D1 and D2, as in the case of the bobbin C of the molded product. Has been. Therefore, when the mating surfaces of the slide cores D1 and D2 are opened after molding and the bobbin C of the molded product is taken out, the runner E is attached to the bobbin C of the molded product as shown in FIG. It was necessary to install a process for separating the bobbin C and the runner E of the molded product. That is, it is difficult to automatically perform the runner process even in the side gate method.
[0005]
In the injection mold using the side gate method, the runner and the gate are the mating surface between the fixed mold plate and the movable mold plate, and the divided surface between the slide core and the movable mold plate. Since it was arranged along the boundary part of the mold part of the molding apparatus, such as the sliding surface, it was a limitation in designing the mold and the molded product.
[0006]
In addition, when using a runnerless mold, the runner and the gate must be arranged in consideration of the position of the insert, as in the case of using the side gate method described above. Becomes even more complicated. Therefore, there is a problem that the price of the molded product becomes high.
[0007]
This invention solves the said subject and provides the resin mold which can perform a runner process automatically after injection molding also in an insert molded product.
[0008]
[Means for Solving the Problems]
In order to solve the above technical problem, the technical means taken in claim 1 of the present invention includes a fixed-side template, a movable-side template arranged to face the fixed-side template, and And a slide core disposed between the fixed mold plate and the movable mold plate and movable in a direction different from the movable direction of the movable mold plate, the fixed mold plate and the movable mold plate And a resin mold for molding a resin molded product by filling the cavity surrounded by the slide core, the resin mold is a resin mold for insert molding, and a side portion of the insert part in is intended to fill the resin, the slide core, a pair of Koapure the surface forming the cavity are superposed with each other in the opposing surface to said cavity is formed into the inner peripheral surface of the insert part Comprising a doo, a sub-runner stripper plates respectively disposed on the outside of both the core plate, be one which slides in the horizontal direction with respect to the movable-side mold plate above, further, the resin mold, the fixed A runner formed on the side mold plate and a sub runner having one end communicating with the runner and extending downward toward the movable side mold plate side along a boundary surface between the core plate and the sub runner stripper plate A sub sprue having one end communicating with the sub runner and penetrating through the core plate in the sliding direction, and a gate formed at the other end of the sub sprue, for mold opening operation of the movable side mold plate Based on this, when the slide core is slid open, the resin molded product and the slide core are separated and the gate is cut. Both by said core plate and said sub runner stripper plate is separated, the resin pieces of the sub-runner and in the Sabusupuru is a resin mold, characterized in that the removable after the resin molding from the slide core .
[0009]
According to the first aspect of the present invention, the sub-runner for injecting the resin into the cavity is arranged inside the slide core, so that the runner can be divided into, for example, a fixed side mold plate and a movable side mold plate as in the prior art. There is no need to place it on the mating surface. That is, it has the effect of increasing the degree of freedom in mold design and molded product design in the injection molding apparatus.
[0010]
Further, since the runner process is executed by the movement of the slide, the runner is cut when the mold is opened, and it is not necessary to cut the runner after taking out the molded product.
[0011]
The invention according to claim 2 is characterized in that a side surface portion of the insert part is formed by the inner peripheral surface of the core plate .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0014]
FIG. 1 is a sectional view of a resin molding die according to an embodiment of the present invention at the time of clamping, FIG. 3 is a sectional view at the time of injection / holding pressure / cooling, and FIG. 5 is a sectional view at the time of mold opening. FIG. 7 is a cross-sectional view at the time of opening, FIG. 9 is a cross-sectional view at the time of separating the sub-runner stripper plate, and FIG. 11 is a state diagram after the molded product is taken out. 2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3, FIG. 6 is a view taken in the direction of the arrow A in FIG. 10 is a view in the direction of arrow A in FIG. 9, and FIG. 12 is a view in the direction of arrow A in FIG.
[0015]
The resin molding die 100 according to this example includes a fixed side mold plate 1, a movable side mold plate 2 disposed so as to face the fixed side mold plate 1, and between the fixed side mold plate 1 and the movable side mold plate 2. The space surrounded by the above three members is a cavity.
[0016]
The fixed-side template 1 is divided into a fixed plate 11 and a runner stripper plate 12 in the mold clamping direction (vertical direction in the figure). The runner stripper plate 12 is provided with a runner lock pin (not shown), and the runner 4 is formed on a parting line PL1 that is a boundary between the fixed plate 11 and the runner stripper plate 12. A sprue 5 communicating with the runner 4 is formed in the runner stripper plate 12 inside. Thus, since the fixed side template 1 is divided into the fixed plate 11 and the runner stripper plate 12 and the runner 4 is formed on the boundary surface PL1 between them, the resin in the runner 4 is removed when the mold is opened. It is possible to remove the runner lock pin by separating the fixed plate 11 and the runner stripper plate 12 from each other.
[0017]
The slide core 3 is divided into a core plate 31 and a sub runner stripper plate 32. As shown in FIG. 1, the core plate 31 is formed as a pair of plates 31 a and 31 b facing each other with the cavity 10 interposed between the core plates 31 a and 31 b. The side surface of the cavity 10 is formed on the inner peripheral surface of 31b. Moreover, the sub runner stripper plate 32 is provided with a sub runner lock pin (not shown), and is disposed as sub runner stripper plates 32a and 32b on the surface opposite to the facing surface of the core plates 31a and 31b, respectively. Yes. And sub runner 6 is formed on each boundary surface of core plates 31a and 31b and sub runner stripper plates 32a and 32b. Therefore, the resin in the sub runner 6 can be taken out from the sub runner stripper plates 32a and 32b by removing the sub runner lock pin when the mold is opened.
[0018]
As shown in FIG. 1, two intermediate sprues 7 are formed inside the fixed plate 11. One end of each of the intermediate sprues 7, 7 communicates with the runner 4, and the other end communicates with the intermediate gates 8a, 8a. The intermediate gates 8a and 8a communicate with the sub runners 6 and 6, respectively. Further, sub sprues 9 and 9 are formed inside the core plates 31a and 31b. One end of each of these blue lures 9 and 9 communicates with the sub-runners 6 and 6, respectively, and the other end communicates with gates 8b and 8b formed on the core plates 31a and 31b. The gates 8b and 8b are resin inlets when the cavity 10 is filled with resin. Therefore, in the mold clamping state, the molten resin introduced into the sprue 5 from the injection molding machine is runner 4, intermediate sprues 7, 7, intermediate gates 8a, 8a, sub runners 6, 6, sub sprues 9, 9, gate 8b. , 8b, a path to be introduced into the cavity 10 from two places is formed.
[0019]
In this example, a metal insert part 20 is pivotally supported in the cavity 10 by a lower core pin 2a. Therefore, the resin filling portion in the cavity 10 is a side surface portion of the insert part 20 as shown in FIG.
[0020]
FIG.1 and FIG.2 shows the state at the time of mold clamping of the resin molding die in this example. From this clamped state, the molten resin is injected into the mold by an injection molding machine (not shown). Then, the molten resin injected from the injection molding machine passes through the sprue 5, the runner 4, the intermediate sprues 7, 7, the intermediate gates 8a, 8a, the sub runners 6, 6, the sub sprues 9, 9, and the gates 8b, 8b. The resin enters the space portion on the side surface of the insert part 20 that is an insert in the cavity 10. The filling state of this resin is shown in FIGS.
[0021]
After filling with the resin, after holding and cooling for a predetermined time, the mold opening operation is started. This mold opening operation is shown in FIGS. In the mold opening operation, first, the movable side mold plate 2 is moved downward, whereby the fixed side mold plate 1 is separated from the slide core 3 and the movable side mold plate 2. Thereby, the resin is cut at the intermediate gates 8a and 8a, and the runner 4 and the sub runner 6 are separated.
[0022]
Further, a slide opening operation as shown in FIGS. 7 and 8 is performed in parallel or following the mold opening operation. In this slide opening operation, the slide core 3 moves in the horizontal direction in the figure, which is a direction different from the mold opening direction (movable direction of the movable side mold plate 3), and the resin molded product in the cavity 10 and the slide core 3 Are separated. As a result, the gates 8b and 8b are cut, the sub-runner 6 and the resin molded product in the cavity 10 are separated, and the mold is opened. Then, the injection molding is completed by taking out the molded product from the resin mold 100 as shown in FIGS.
[0023]
Here, the runner 4 can be removed from the resin mold 100 by separating the fixed plate 11 and the runner stripper plate 12 after being cut at the intermediate gates 8a and 8a and releasing the holding by the runner lock pin. Similarly, after cutting at the gates 8b and 8b, the sub-runner 6 separates the core plates 31a and 31b and the sub-runner stripper plates 32a and 32b as shown in FIGS. 9 and 10 and holds them by the sub-runner lock pins. By releasing, the sub runners 6 and 6 can be detached from the resin mold 100.
[0024]
As described above, the runner-treated molded product bobbin, the sub-runner 6 and the runner 4 can be taken out.
[0025]
The slide core 3 is divided into core plates 31a, 31b and sub-runner stripper plates 32a, 32b in a direction facing the mating surface, and the sub-runner 6 is arranged on the divided surface, from the sub-runner 6 to the core plate 31a, By dropping the gates 8b and 8b introduced into the cavity 10 through 31b, the sub-runner process can be automatically performed when the slide core 3 is opened. Therefore, the molded product bobbin, the runner 4 and the sub-runner 6 are taken out from the resin mold 100 in a separated state. Therefore, by using the resin molding die according to the present example, it is possible to separate the molded product from the runner 4 and the sub-runner 6 after injection molding, and to take them out respectively.
[0026]
In addition, the arrangement of runners and gates is not limited to the mating surface of the slide core or the sliding surface between the slide core and the movable side template as in the past, and can be arranged arbitrarily. Become. Accordingly, it is possible to increase the degree of freedom in product design and mold design.
[0027]
Here, each of the runner stripper plate and the sub runner stripper plate does not necessarily have a runner lock pin, and the runner and the sub runner can be removed from the mating surface of the mold when the mold of the injection molding apparatus is opened. Any structure can be used.
[0028]
In this embodiment, the injection molding apparatus including the insert in the cavity has been described. However, the present invention can also be applied to an injection molding apparatus that does not include the insert in the cavity.
[0029]
【The invention's effect】
As described above, according to the present invention, runner processing after molding is not required, and the degree of freedom in mold design and molded product design of the injection molding apparatus can be increased.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a resin mold according to an embodiment of the present invention when tightened.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a cross-sectional view of a resin mold according to an embodiment of the present invention during injection, pressure holding, and cooling.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a cross-sectional view of the resin mold according to one embodiment of the present invention when the mold is opened.
6 is a view in the direction of arrow A in FIG.
FIG. 7 is a cross-sectional view of the resin mold according to one embodiment of the present invention when the slide is opened.
8 is a view in the direction of arrow A in FIG.
FIG. 9 is a cross-sectional view when the core plate of the slide core and the sub-runner stripper plate are separated in the resin mold according to one embodiment of the present invention.
10 is a view in the direction of arrow A in FIG.
FIG. 11 is a view when a molded product is taken out from the resin mold according to one embodiment of the present invention.
12 is a view in the direction of arrow A in FIG.
FIG. 13 is a cross-sectional view showing a resin mold in the prior art.
14 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Fixed side template 11 ... Fixed plate 12 ... Runner stripper plate 2 ... Movable side template 3 ... Slide core 31a, 31b ... Core plate, 32a, 32b ... Sub runner stripper plate 4 ... runner 5 ... sprue 6 ... sub runner 7 ... intermediate sprue 8a ... intermediate gate, 8b ... gate 9 ... sub sprue 10 ... cavity 20 ... Bobbin 100 ... Resin mold

Claims (2)

A stationary mold plate, a movable mold plate arranged to face the fixed mold plate, and a movable direction of the movable mold plate disposed between the fixed mold plate and the movable mold plate. And a slide core that is movable in a different direction, and a resin that forms a resin molded product by filling a resin into a cavity surrounded by the fixed side mold plate, the movable side die plate, and the slide core In the mold
The resin mold is a resin mold for insert molding, in which a side surface portion of an insert part is filled with resin.
The slide core includes a pair of core plates whose surfaces forming the cavities are formed on an inner peripheral surface and overlapped with each other on a surface facing the cavities, and sub-runners disposed on the outer sides of both core plates. A stripper plate, which slides horizontally on the movable side template,
Further, the resin mold includes a runner formed on the fixed-side mold plate, one end communicating with the runner, and the movable-side mold plate along a boundary surface between the core plate and the sub-runner stripper plate. A sub runner extending downward toward the side, a sub sprue having one end communicating with the sub runner and penetrating through the core plate in the sliding direction, and a gate formed at the other end of the sub sprue,
Based on the mold opening operation of the movable side mold plate, the slide core performs a slide opening operation, whereby the resin molded product and the slide core are separated to cut the gate, and the core plate and the sub-runner. A resin molding die characterized in that, by separating from the stripper plate, the resin piece in the sub runner and the sub sprue can be detached from the slide core after resin molding.   The resin mold according to claim 1, wherein a side surface portion of the insert part is formed by an inner peripheral surface of the core plate.

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