JP2002067100A - Injection molding die device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen a load on an operator during remodeling a resin flow channel and thereby, obtain an optimal resin flow channel in a short time. SOLUTION: This injection molding die device is equipped with a fixed side half 8 of a molding die, a movable side half 9 of the molding die provided in such a way that it moves forward to and backward from the fixed side half 8 a cavity 13 to be formed by clamping both halves 8 and 9 and the resin flow channel which is arranged with the cavity 13 on the orthogonal parting face 10b of the molding die with the forward/backward moving direction of the movable half 9 and flows a resin into the cavity 13. The resin flow channel is configured in such a way that it is formed in a flow channel block provided, in a freely attachable/detachable manner, at the movable half 9 of the molding die.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus for flowing a resin into a cavity through a runner.

[0002]

2. Description of the Related Art A mold apparatus used in an injection molding machine is provided with a movable mold that can move forward and backward with respect to a fixed mold, and a cavity is formed by clamping both molds to form an injection mold. The resin injected from the machine is caused to flow into the cavity through a resin flow path including a runner and a gate, whereby the resin is pressed into the cavity to form a molded product. Conventionally, a configuration in which both are integrally formed in a mold so that a cavity and a resin flow path are present on a mold parting surface is suitable for a relatively large molded product. Used as a mold device.

[0003]

However, in the structure in which the cavity and the resin flow path are formed integrally with the mold as in the above-mentioned conventional technique, the resin flow path most suitable for the flow and cooling of the resin is provided. It is necessary to remove and attach the entire mold to the injection molding machine every time the resin flow path is modified when trying to form the mold by trial and error, and transport this mold to the processing place There is a need to.
As a result, since various processing operations are performed on the entire mold, which is a heavy object, the burden on the operator becomes large, and as a result, there is a problem that it takes a long time to obtain an optimal resin flow path.

[0004] Accordingly, the present invention provides an injection mold apparatus which reduces the burden on the operator when remodeling the resin flow path and makes it possible to obtain an optimum resin flow path in a short time. .

[0005]

In order to solve the above-mentioned problems, an invention according to claim 1 includes a fixed-side mold and a movable-side mold that is provided so as to be capable of moving forward and backward with respect to the fixed-side mold. A cavity formed by clamping the two dies, and a resin flow path disposed together with the cavities on a mold parting surface orthogonal to a moving direction of the movable mold and moving the resin into the cavities. Wherein the resin flow path is formed in a flow path block removably provided in at least one of the fixed mold and the movable mold. Features.

According to the above configuration, since the resin flow path is formed in the flow path block detachably provided on the fixed mold or the movable mold, when the resin flow path is modified, In addition, various processing operations such as a transportation operation may be performed only on the flow path block which is significantly lighter than the conventional one. Thereby, the burden on the operator is reduced, and an optimal resin flow path can be obtained in a short time.

According to a second aspect of the present invention, in the injection molding die apparatus according to the first aspect, the resin flow path is formed in the flow path block in a cross-sectional shape where the die parting surface is an upper surface. It is characterized by being.

According to the above configuration, since the resin flow path is formed in the flow path block so that the mold parting surface is the upper surface, the resin flow path is formed in one of the fixed mold and the movable mold. With a configuration in which a road block is provided, a resin flow path can be formed in a mold that has been clamped. This makes it possible to simplify the mold and the flow path block, and to obtain an optimum resin flow path in a shorter time than when a flow path block is provided in both molds to form a resin flow path. Can be.

According to a third aspect of the present invention, there is provided the injection molding apparatus according to the first or second aspect, wherein the flow path block comprises:
It is characterized by being formed of a metal material selected from aluminum, an aluminum alloy, a Cu-Ni-Si alloy, a beryllium copper alloy, azurolded steel, and pre-hardened steel.

[0010] According to the above configuration, the handling is further facilitated by reducing the weight of the flow path block, and the resin existing in the resin flow path of the flow path block can be rapidly cooled.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 3A and 3B, the injection mold apparatus according to the present embodiment
The injection molding machine 1 is provided so as to be able to come and go. The injection molding machine 1 includes a hopper 3 for accommodating pellet-shaped resin, a plunger 4 for feeding resin from the hopper 3, and a plunger 4.
A molding machine main body 5 that heats and melts the resin fed under pressure, and a nozzle 6 that has a tip end surface formed in a convex curved shape and injects a molten resin.

On the other hand, an injection mold device 7 (hereinafter, referred to as a mold device 7) used in the above-described injection molding machine 1 is provided.
It has a fixed mold 8 made of steel such as as-rolled steel or pre-hardened steel, and a movable mold 9 provided to be able to move forward and backward with respect to the fixed mold 8. In the fixed mold 8,
A joining portion 8a formed in a concavely curved shape so as to abut the tip end surface of the nozzle 6 in a planar shape, and a mold parting surface 10a while increasing an opening diameter from the bottom of the joining portion 8a toward the movable mold 9. And a sprue 8b penetrating therethrough.

The mold parting surface 10a of the movable mold 9 is provided on the mold parting surface 10a of the fixed mold 8 described above.
Are facing each other. As shown in FIGS. 1 and 2, the movable mold 9 includes a steel mold body 11 such as as-rolled steel or pre-hardened steel, and a flow path block 12 detachably provided to the mold body 11. And Mold body 1
1, a product part 11a which is arranged at a predetermined distance from the opening position of the sprue 8b along the mold parting surface 10b and forms a cavity 13 by clamping the molds 8 and 9; A gate 11b formed along the mold parting surface 10b from the side surface of the gate 11a;
A block fitting portion 11c formed along the mold parting surface 10b is formed in a range from 1b to the position where the opening of the sprue 8b is positioned inside.

The movable mold 9 includes a plurality of ejector pins 14, a hook-type sprue lock pin 15 having an engaging portion 15a formed at a tip end, and a plurality of these pins 14.
FIG. 3 in which the movable member 15 moves forward and backward in the same direction as the movable mold 9.
(A) and (b). The ejector pin 14 is arranged so as to correspond to the product part 11a, and is movably inserted through the mold body 11, so that the molded product is pushed out from the product part 11a by advancing. . On the other hand, the sprue lock pin 15 is disposed so as to correspond to the opening of the sprue 8b, is movably inserted through the mold body 11, and remains in the sprue 8b when the movable mold 9 is retracted. It comes out of the resin.

A channel block 12 is removably fitted to a block fitting portion 11c formed on the mold body 11 of the movable mold 9. The flow path block 12 is formed of a metal material selected from aluminum, an aluminum alloy, a Cu—Ni—Si alloy, a beryllium copper alloy, azurolded steel, pre-hardened steel, and the like. In addition, aluminum, aluminum alloy, Cu-
Ni-Si alloys and beryllium copper alloys have higher thermal conductivity than steel materials, and can be used to rapidly cool the resin of the runner 12b, and thus are preferable as the metal material of the flow path block 12, and in particular, aluminum and aluminum alloys are: Since it has a small specific gravity and is suitable for weight reduction, it is most preferable as the metal material of the flow path block 12.

At four corners of the flow path block 12, fixing bolts 17 are inserted. These fixing bolts 17
The thread block is screwed into the mold body 11 to fasten the flow path block 12 to the mold body 11. The surface of the flow path block 12 is formed so as to be flush with the mold parting surface 10b. The gate 1 of the mold body 11 is provided on the surface of the flow path block 12.
A communication gate 12a connected to the communication gate 1b and a runner 12b formed to flow resin from the sprue 8b to the communication gate 12a are formed.

An adjustment method and operation of the mold apparatus 7 in the above configuration will be described. First, the mold body 11 having the product part 11a, the gate 11b, and the block fitting part 11c is prepared. Further, a flow path block 12 having a communication gate 12a and a runner 12b formed on the surface is prepared. After the passage block 12 is fitted into the block fitting portion 11c of the mold body 11, the passage block 12 is fastened to the mold body 11 by the fixing bolt 17, whereby the movable mold 9 is assembled. .

Next, as shown in FIG. 3A, after the mold apparatus 7 including the movable mold 9 and the fixed mold 8 is attached to the injection molding machine 1, the injection molding machine 1 is operated. As a result, the resin is injected into the mold device 7. That is, after the fixed mold 8 and the movable mold 9 are clamped,
The nozzle 6 of the injection molding machine 1 is pressed against the joint 8a of the fixed mold 8. Then, the resin is pressure-fed by the plunger 4, and is heated and melted by the molding machine main body 5, while the fixed mold 8 is heated.
To the sprue 8b. As a result, the molten resin reaches the runner 12b of the flow path block 12 via the sprue 8b as shown in FIG.
b and the communication gate 12a and the gate 11b
Through the cavity 13. After the cavity 13 is filled with a sufficient pressure, it is cooled and solidified to obtain a molded product having the outer shape of the product part 11a.

When a molded article is prepared as described above,
The nozzle 6 is separated from the fixed mold 8. The movable mold 9 is opened by retracting the movable mold 9 with respect to the fixed mold 8. As a result, as shown in FIG.
The engaging portion 15a of the sprue lock pin 15 is
By pulling out the resin in the sprue 8b, the resin in the sprue 8b is taken out together with the molded product of the movable mold 9. Thereafter, when the ejector pins 14 are pushed out by the plate member 16, the molded product is peeled from the movable mold 9 and taken out.

Next, the condition (quality) of the molded product is confirmed by the operator, and as shown in FIGS. 1 and 2, when a defect caused by the runner 12b occurs in the molded product, the fixing bolt 17 is used. After the fastening of the flow path block 12 is released, the flow path block 12 is removed from the mold body 11. Thereafter, the flow path block 12 is transported to the processing place, and the runner 12b and the communication gate 12a are modified. Then, the remodeled flow path block 12 is mounted on the mold main body 11 again, and a trial production of a molded product is performed by the same operation as described above.

As a result, since the attaching / detaching operation or the carrying operation is performed on the flow path block 12 which is much lighter than the movable mold 9, even if the remodeling of the runner 12b or the like is repeatedly performed, The burden on the operator is significantly reduced as compared with the case where the work is performed on the entire movable mold 9. Further, even if a new runner 12b is formed in the flow path block 12, the processing on the mold body 11 side is performed by the gate 11 corresponding to the new runner 12b.
Since only b is formed, it can be performed very easily.

As described above, the mold apparatus 7 of the present embodiment
Includes a fixed mold 8, a movable mold 9 provided to be movable forward and backward with respect to the fixed mold 8, a cavity 13 formed by clamping the two molds 8 and 9, A resin flow path is provided together with the cavity 13 on the mold parting surface 10b orthogonal to the direction of movement of the mold 9 and allows the resin to flow through the cavity 13. It is configured to be formed in a flow path block 12 that is detachably provided in the apparatus.

In this embodiment, the case where the resin flow path of the flow path block 12 is constituted by the runner 12b and the communication gate 12a has been described. However, the present invention is not limited to this. Only, or may include the gate 11b on the mold body 11 side. Further, in the present embodiment, the case where the flow path block 12 is provided in the movable mold 9 is described, but at least one of the fixed mold 8 and the movable mold 9 is used. It is good if it is provided in. For example, when the flow path blocks 12 are provided in both the dies 8 and 9, a resin flow path having a large flow area is formed when the flow path blocks 12 and 12 come into contact with each other by mold clamping. It becomes possible to do.

In the case of the mold apparatus 7 configured as described above, the resin flow path is formed in the flow path block 12 detachably provided to the fixed mold 8 and the movable mold 9. Therefore, when performing various processing operations on the resin flow path, various processing operations such as a transport operation may be performed only on the flow path block 12 which is significantly lighter than the conventional one. Thereby, the burden on the operator is reduced, and an optimal resin flow path can be obtained in a short time.

In addition, the flow path block 1 in the present embodiment
The second resin flow path is formed in the flow path block 12 with a cross-sectional shape in which the mold parting surface 10b is the upper surface. As a result, the fixed mold 8 and the movable mold 9
If the flow path block 12 is provided in any one of the molds, the resin flow path can be formed in the closed molds 8 and 9. As a result, the flow path block 1 is placed in both dies 8 and 9.
2 and molds 8 and 9 as compared with the case where the resin flow path is formed.
And the flow path block 12 can be simplified,
An optimal resin flow path can be obtained in a shorter time.

The mold device 7 in this embodiment is
Although the case where one cavity 13 is formed in the molds 8 and 9 and one flow path block 12 is provided has been described, the present invention is not limited to this. That is, as shown in FIG. 4, a plurality of cavities 1 arranged concentrically
A flow path block 12 having a configuration in which runners 12b are formed radially with respect to 3 may be provided. Further, the runner 12b is divided into a plurality of sections,
A plurality of flow path blocks 12 formed to have b may be provided.

[0027]

According to the first aspect of the present invention, the fixed-side mold, the movable-side mold provided to be able to move forward and backward with respect to the fixed-side mold, and the mold clamping of the two molds are formed. In an injection molding apparatus, the cavity includes a cavity, and a resin flow path that is disposed together with the cavity on a mold parting surface orthogonal to a moving direction of the movable mold and moves a resin into the cavity. The resin flow path is formed in a flow path block detachably provided in at least one of the fixed mold and the movable mold.

According to the above configuration, since the resin flow path is formed in the flow path block detachably provided on the fixed mold or the movable mold, when the resin flow path is modified, In addition, various processing operations such as a transportation operation may be performed only on the flow path block which is significantly lighter than the conventional one. Thus, the effect of reducing the burden on the operator and obtaining the optimum resin flow path in a short time is achieved.

According to a second aspect of the present invention, in the injection molding die apparatus according to the first aspect, the resin flow path is formed in the flow path block with a cross-sectional shape in which the die parting surface is an upper surface. Configuration.

According to the above configuration, since the resin flow path is formed in the flow path block so that the mold parting surface is on the upper surface, the flow path is formed in one of the fixed mold and the movable mold. With a configuration in which a road block is provided, a resin flow path can be formed in a mold that has been clamped. This makes it possible to simplify the mold and the flow path block, and to obtain an optimum resin flow path in a shorter time than when a flow path block is provided in both molds to form a resin flow path. This has the effect that it can be performed.

According to a third aspect of the present invention, there is provided the injection mold apparatus according to the first or second aspect, wherein the flow path block comprises:
The structure is made of a metal material selected from aluminum, an aluminum alloy, a Cu—Ni—Si alloy, a beryllium copper alloy, azurolded steel, and pre-hardened steel.

According to the above-described structure, the handling is further facilitated by reducing the weight of the flow path block, and the resin existing in the resin flow path of the flow path block can be rapidly cooled. Play.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a movable mold.

FIG. 2 is a sectional view of a main part of the injection-molding mold apparatus clamped.

FIG. 3 is an explanatory view showing an operation process of injection molding;
(A) is an explanatory view of a state in which the resin is injected, and (b) is an explanatory view of a state in which the mold is opened.

FIG. 4 is an explanatory diagram showing a state of a flow path block.

FIG. 5 is an explanatory diagram showing a state of a flow path block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection molding machine 3 Hopper 4 Plunger 5 Molding machine main body 6 Nozzle 7 Mold apparatus 8 Fixed side mold 9 Movable side mold 10a Mold parting surface 10b Mold parting surface 11 Mold body 11a Product part 11b Gate 11c Block fitting portion 12 Flow path block 12a Communication gate 12b Runner 13 Cavity 14 Ejector pin 15 Sprue lock pin 16 Plate member 17 Fixing bolt

Claims (3)

[Claims] 1. A fixed mold, a movable mold provided so as to be able to advance and retreat with respect to the fixed mold, a cavity formed by clamping the two molds, and the movable mold. In an injection molding die apparatus, provided with a cavity on a mold parting surface orthogonal to a direction of movement of a mold and a resin flow path for flowing resin into the cavity, the resin flow path is fixed. An injection molding apparatus, wherein the apparatus is formed in a flow path block detachably provided in at least one of a side mold and a movable side mold. 2. The injection molding die apparatus according to claim 1, wherein the resin flow path is formed in the flow path block in a cross-sectional shape in which the mold parting surface is an upper surface. 3. The flow path block is formed of a metal material selected from aluminum, an aluminum alloy, a Cu—Ni—Si alloy, a beryllium copper alloy, azurolded steel, and pre-hardened steel. The injection molding die apparatus according to claim 1 or 2, wherein