JP2006007620A - Injection molding apparatus/method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding apparatus which can heat up an intracavity molding material by transmitting sufficient ultrasonic vibration to the molding material while inhibiting a load on a vibration transmission system to be brought to bear on the device under a simple configuration with a broad degree of design freedom, and an injection molding method. <P>SOLUTION: In the injection molding apparatus, an insert mold 4 with a cavity 13 is provided in a main mold 3 and has one end of a vibration transmitting wire 6, connected with the mold 4 through a space 3a, while a vibration generating part which can generate an ultrasonic wave, is connected with the other end of the vibration transmitting wire 6. Thus the insert mold 4 is vibrated by the vibration generating part through the vibration transmitting wire 6. The vibration energy generated by the vibration generating part can be concentrically transmitted to the insert mold 4 which comes into contact with the molding material. In addition, in order to transmit the ultrasonic wave by the vibration transmitting wire 6 passing through the internal space 3a of the mold 3, it is possible to transmit the vibration easily and significantly scale down the vibration transmission system. Consequently, the ultrasonic energy does not adversely affect the other part of the device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an injection molding apparatus and an injection molding method suitable for a heat cycle molding method for giving a temperature amplitude to a mold.
In particular, the present invention relates to an injection molding apparatus and an injection molding method for efficiently heating a resin using ultrasonic vibration.

Conventionally, a heat cycle molding method for giving a temperature amplitude to a mold is known as a molding method of a thermoplastic resin (see, for example, Patent Documents 1 and 2).
In this heat cycle molding method, when the molten resin is filled in the mold, the temperature of the surface on which the mold cavity (so-called cavity) is formed is increased, and the temperature of this surface is decreased after the filling is completed. It is a molding method.
As the heat cycle molding method, a method of passing a heating medium and a cooling medium through a mold, a method of using an electric heater or a high frequency to heat the mold, and the like have been proposed.

Advantages of heat cycle molding include the following characteristics.
(1) The weld line cannot be seen.
This is because the mold temperature is already maintained at the heat deformation temperature or higher during the injection molding, so that the temperature drop on the resin surface is alleviated and the transferability to the mold is improved.
(2) The surface gloss is improved.
This is because the mold temperature is maintained at a high temperature during pressure holding, so that the transferability of the resin to the mold surface is improved.
(3) A product having a good appearance in which glass fibers and the like are not exposed can be obtained.
In general molding of resin containing glass fiber, carbon fiber, filler, etc., these additives are exposed on the surface and the surface of the molded product becomes rough, but if heat cycle molding method is used, such state occurs Can be suppressed.
It has an influence that additives such as glass fibers are incorporated into the resin surface layer and a natural layer of resin is formed on the surface layer.

(4) A good texture transfer can be obtained.
Since the mold temperature is kept high during pressure holding, the transfer of resin to the mold surface is improved, and when molding a product with a fine surface with a textured surface, the textured shape of the mold is accurate. Can be transferred.
(5) Resin strength is improved.
This is because the crystallization of the resin in the vicinity of the product surface is promoted in order to keep the mold temperature high.

Incidentally, as a technique for improving the quality of an injection molded product, for example, an ultrasonic injection molding method is known in addition to a heat cycle molding method (see, for example, Patent Document 3).
In the method described in Patent Document 3, a mold is constituted by a horn, and vibration is transmitted to a molding material injected into the mold.
According to this method, there is an effect of increasing the temperature of the molding material injected into the cavity (so-called cavity) of the molded product to make the temperature gradient and temperature distribution uniform, and the injection molded product remains with internal stress. It can be prevented from solidifying.
If solidified with internal stress, the dimensions of the molded product will change over time.

JP 2001-225371 A JP 2003-145576 A JP 58-134722 A

  However, in the method described in Patent Document 3, the arrangement position of the horn is limited, so that the degree of freedom in designing the mold is reduced, and the ratio of the horn is large and the vibration transmission system becomes large. There was a problem of adversely affecting the part.

The present invention has been made on the basis of such background technology, and has been made to overcome the above-described problems of the background technology.
In other words, the present invention has a high degree of freedom in design, has a simple structure, and suppresses the load of the transmission system applied to the apparatus, while transmitting sufficient ultrasonic vibration to the molding material in the cavity to raise the temperature of the molding material. An object of the present invention is to provide an injection molding apparatus and an injection molding method that can be used.

  Thus, as a result of intensive research on the background of such problems, the present inventor has provided a nested mold in a limited region that becomes the cavity of the main mold of the mold, and applied ultrasonic vibration to the nested mold as much as possible. The inventors have found that the above problems can be solved by reducing the transmission system, and have completed the present invention based on this finding.

  That is, according to the present invention, (1) the main mold is provided with a nested mold having a cavity, and one end of the vibration transmitting wire is connected to the nested mold through the space, and the other end of the vibration transmitting wire is connected to the other mold. The present invention resides in an injection molding apparatus in which a vibration generating unit capable of generating an ultrasonic wave is connected and a nested mold is vibrated from the vibration generating unit via a vibration transmission wire.

  Further, the present invention is the above (2), wherein the vibration generating unit includes an ultrasonic oscillator capable of generating an ultrasonic electric signal and a vibrator that is vibrated by an electric signal from the ultrasonic oscillator. It exists in the injection molding apparatus as described in (1).

  Moreover, this invention exists in the injection molding apparatus as described in said (1) or (2) with which the said vibration transmission wire and the said nested type were connected through the block-shaped connection member.

  Further, according to the present invention, (4) a nested type is provided for each of the movable part and the fixed part of the main mold, and a vibration transmission wire is provided for each of the nested type of the movable part and the nested type of the fixed part. It exists in the injection molding apparatus of any one of said (1) thru | or (3) connected.

  Further, according to the present invention, (5) the movable part or the fixed part of the main mold is provided with a plurality of nested molds, and a vibrator is connected to each of the plurality of nested molds via a vibration transmission wire, The plurality of vibrators exist in the injection molding apparatus according to any one of (1) to (3), which is controlled by one ultrasonic oscillator.

  Moreover, this invention exists in the injection molding apparatus of any one of said (1) thru | or (5) to which the said vibration transmission wire can be bent and deformed (6).

  Further, according to the present invention, (7) an injection molding in which ultrasonic vibration is transmitted to a nested mold from a vibration generating part separated from the nested mold in a nested mold having a cavity provided in the injection molding apparatus via a vibration transmission wire. Lies in the way.

  The present invention also resides in (8) the injection molding method according to the above (7), wherein the ultrasonic vibration is applied from the stage before starting filling the cavity with the resin material to the time when filling is completed.

  In addition, as long as the objective of this invention is met, the structure which combined said (1)-(8) suitably is also employable.

According to the present invention, the main mold 3 is provided with a nested mold 4 having a cavity 13, and one end of the vibration transmission wire 6 is connected to the nested mold 4 through the space 3 a. A vibration generating unit capable of generating ultrasonic waves is connected to the end, and the nested mold 4 is vibrated from the vibration generating unit via the vibration transmission wire 6, so that vibration energy generated by the vibration generating unit is brought into contact with the molding material. It is possible to transmit to the nesting mold 4 in a concentrated manner.
In addition, the contact interface with the molding material (specifically, the interface between the solid phase and the molten phase of the molding material) is heated by the vibration energy transmitted to the insert mold 4 and the entire molding material is heated.

In addition, since the ultrasonic transmission is performed by the vibration transmission wire 6 through the space 3a in the mold, vibration can be easily transmitted, and the vibration transmission system is extremely small.
Therefore, it does not adversely affect other parts of the ultrasonic energy.
In order to apply ultrasonic energy to the nested mold 4 having a small volume constituting the cavity 13, it is not necessary to increase the output.
Since the nested mold 4 is small, the heat capacity is small, and since only the temperature rise in the vicinity of the nested mold is required, the cooling can be performed quickly and the cycle time can be greatly shortened.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 shows an injection molding apparatus according to the first embodiment of the present invention.
This injection molding apparatus has a movable side portion 1 and a fixed side portion 2, and includes a movable portion 3A and a fixed portion 3B (the movable portion 3A and the fixed portion 3B are referred to as a main mold 3).
A nesting die 4 having a cavity 13 is disposed in the fixing portion 3B. The nesting die 4 can be easily detached from the fixing portion 3B by a fixing tool such as a bolt.
The material of the insert mold 4 is preferably a material having thermal conductivity and good wear resistance. For example, a metal material such as carbon steel or stainless steel is used.
A carbon steel surface that has been subjected to induction hardening, carburizing treatment, nitriding treatment, or the like can be used.

A cavity 13 is formed by the movable portion 3A and the fixed portion 3B (specifically, the nesting die 4 of the fixed portion 3B) pressed against the movable portion 3A.
A vibration transmission wire 6 is detachably attached to the nested mold 4 via a block-shaped connecting member 5.
That is, the connection member 5 is attached to one end of the vibration transmission wire 6, and the vibration transmission wire 6 is easily attached to the nesting die 4 by screwing the screw portion of the connection member 5 to the nesting die 4.
There are various structures of the connecting member 5, and the connecting member 5 can be made of a metal material such as an aluminum alloy or a titanium alloy.
On the other hand, the vibrator 7 is connected to the other end of the vibration transmission wire 6.

Since the vibration transmission wire 6 and the nesting die 4 are connected via the connection member 5, for example, when the vibration transmission wire 6 causes metal fatigue, the connection member 5 is removed from the nesting die 4. Therefore, it can be easily replaced.
However, it is naturally possible to directly attach the vibration transmission wire 6 to the nested mold 4 by bonding or brazing.

  As the vibration transmission wire 6, a wire that can efficiently transmit ultrasonic vibration from the vibrator 7 to the telescopic die 4 is adopted, but a flexible wire, for example, an aluminum alloy wire or a titanium alloy wire is used.

The vibrator 7 to which the vibration transmission wire 6 is connected is further connected to an ultrasonic oscillator 8 which is a generation source of the ultrasonic electric signal.
The piezoelectric element incorporated in the vibrator 7 is expanded and contracted (magnetostriction phenomenon) by the electrical signal from the ultrasonic oscillator 8 to generate ultrasonic vibrations (vibration is generated by the ultrasonic oscillator 8 and the vibrator 7). Part is formed).
This ultrasonic vibration is transmitted to the nested mold 4 through the vibration transmission wire 6.

By the way, the vibration transmission wire 6 connects the vibrator 7 and the nested die 4 through the space 3a of the fixed portion 3B.
And in order to transmit an ultrasonic vibration to the nest | die 4 efficiently without hindrance, it arrange | positions so that it may not contact a part of fixing | fixed part 3B which is a metal mold | die on the way.
From the viewpoint of ultrasonic transmission characteristics, it is important that the vibration transmission wire 6 does not form a right angle portion.

That is, in FIG. 1, the vibration transmission wire 6 has two bent portions from the vibrator 7 to the nested mold 4, and this bent portion is a bent portion with a gentle curve so as not to be bent at a right angle. Is forming.
In that sense, the nested mold 4 is easier to install when it is incorporated in the fixed portion 3B than the movable portion 3A because the vibration transmission wire itself is in a stable state due to the routing of the vibration transmission wire 6.

On the other hand, 3 A of movable parts are provided with the ejector 11 for protruding a molded article.
In this figure, the ejector 11 ejects the molded product from the movable part 3A by means of three protrusions 11a to release the mold.
Further, the ejector 11 is protruded forward by the knock member 12.

Now, since the vibration transmission wire 6 has a property of bending deformation (bending deformation), it is preferable to use the connection member 5 to attach it to the nested mold 4.
FIG. 2 shows an example of a method for connecting the vibration transmission wires 6.
One end of the vibration transmission wire 6 on the nesting type side is coupled to the connection member 5. As this coupling method, for example, the vibration transmission wire 6 is bonded to the connection member 5 by an ultrasonic pressure bonding method, and the joint is spot-heated. A method can be employed (see Japanese Patent Application Laid-Open No. 6-244230).
On the other hand, a connector portion 6a is attached to the other end of the vibration transmission wire 6, and a pin 7a formed at one end of the vibrator 7 is press-fitted into the connector portion 6a, so that both are mechanically connected.

FIG. 3 is a diagram showing an injection molding process of a molded product.
FIG. 3A shows a state immediately after the mold is clamped and the cavity 13 is filled with a resin material.
At this time, the ultrasonic vibration oscillated from the vibrator 7 by the ultrasonic oscillator 8 is transmitted to the nested mold 4 through the vibration transmission wire 6.
That is, the ultrasonic vibration is transmitted from the vibration generating part away from the nested mold 4 to the nested mold 4 through the vibration transmission wire 6.

Ultrasonic vibration is transmitted to the nesting mold 4 from the stage before the cavity 13 starts to be filled with the resin material, and the resin material filled in the cavity 13 in the nesting mold is heated.
In this case, as a heating principle, first, frictional heat is generated at the interface between the cavity inner wall and the resin material, and the heat propagates to the surroundings. As a result, the entire resin material is heated.
The ultrasonic vibration is applied until the resin material is completely filled, but after the resin material is filled, the oscillation of the ultrasonic vibration is stopped, the pressure is maintained for a certain period of time and the resin material is solidified.
Meanwhile, the nested mold 4 is cooled together with the main mold 3 by a cooling means (not shown), and the temperature of the resin material in the cavity is also lowered.
Here, since the volume of the nested mold 4 occupying the main mold 3 is small, the heat capacity of the nested mold 4 is small, and the main mold 3 is efficiently cooled together with the cooling of the main mold 3.

After the resin material is solidified, mold opening is performed as shown in FIG.
At this time, the molded product 17 usually remains attached to the movable portion 3A.
Next, as shown in FIG. 3C, the ejector 11 is projected by the knock member 12, and the protrusion 11 a of the ejector 11 projects the molded product 17 to release it.
Since the resin material remains as burrs 17a in the removed molded product 17, this is later removed by manual work or the like.
This completes the one-cycle molding.

The mold is then clamped to enter a new cycle injection process.
Also in this case, as described above, while the cavity 13 is filled with the resin material, ultrasonic vibration is transmitted to the nested mold 4, and the resin material in the filled cavity is heated at the interface. Thus, a new cycle is performed through the steps described above.

By the way, in the injection molding apparatus of the present invention, the resin material is heated using ultrasonic vibration, but the temperature can be considerably higher than that of the conventional heat cycle molding.
FIG. 4 is a diagram showing the mold temperature (cavity wall surface temperature) in the injection molding method of the present invention.
The cavity wall surface temperature of the nested mold 4 can be increased to about 380 ° C., and the height can be freely set to, for example, 380 ° C., 200 ° C., 100 ° C. by adjusting the output of the ultrasonic oscillator. It is possible to select.
In addition, (circle) shows the conventional heating method.
●, ▲, ■ indicate the heating method of the present invention.

The cavity wall surface temperature is generated by frictional heat at the interface between the cavity wall surface and the resin material, and is substantially equal to the resin material temperature at the interface.
Since the cavity wall surface is only heated instantaneously by the cavity wall surface of the insert mold 4 and the resin material, the heat capacity for heating is small.
Rather than raising the temperature of the entire nested mold, only the cavity wall surface is instantaneously heated, so the heating area is limited to the portion in contact with the resin material, so the amount of heat present in the entire nested mold is small. .

  According to the first embodiment described above, the main mold 3 is provided with the nesting mold 4 in contact with the molding material (resin material), and one end of the vibration transmission wire 6 is connected to the nesting mold 4 to transmit the vibration. A vibrator 7 is connected to the other end of the wire 6, the vibrator 7 is connected to an ultrasonic oscillator 8, and the ultrasonic oscillator 8 enters the nested mold 4 through the vibrator 7 and the vibration transmission wire 6. Because of the structure that provides ultrasonic vibrations, vibration energy generated by the vibrator 7 can be intensively transmitted only to the nested mold 4 that is in contact with the molding material.

In addition, vibration can be easily transmitted due to ultrasonic transmission by the vibration transmission wire 6 passing through the spaces 3a and 3b in the mold, and the vibration transmission system is extremely small.
Therefore, there is little adverse effect on the other parts by the ultrasonic energy.
The vibration energy transmitted to the nesting die 4 is converted into thermal energy at the interface between the cavity wall surface and the resin material (the solid phase and the molten phase of the resin material first fixed to the cavity wall surface).

Thus, if vibration is directly transmitted to the nested mold 4 forming the cavity 13, vibration energy can be efficiently transmitted to the resin material.
When the cavity 13 is cooled and the process proceeds to the injection molding of the next cycle, the heating portion is limited to the cavity wall surface of the nesting die 4, so that the cooling is performed quickly and the cycle time can be greatly shortened.

[Second Embodiment]
FIG. 5 shows an injection molding apparatus according to the second embodiment of the present invention.
In addition, although the same code | symbol is attached | subjected to the same structural member as 1st Embodiment, the detailed description is abbreviate | omitted, but it is the same also in other embodiment below.

In the injection molding apparatus according to the second embodiment, nested molds 4A and 4B are disposed in the movable part 3A and the fixed part 3B of the main mold 3, respectively.
Ultrasonic vibration is transmitted from the vibrator 7 via the vibration transmission wire 6 to the nested mold 4A of the movable part 3A and the nested mold 4B of the fixed part 3B.
In such a structure, since the ultrasonic vibration is received from both the nested mold 4A of the movable portion 3A and the nested mold 4B of the fixed portion 3B, that is, the ultrasonic vibration is received from the entire wall surface of the cavity 13, the resin material is efficiently heated. Done.

In the second embodiment, since the vibration transmitting wire 6 is also disposed in the movable portion 3A that performs the left-right movement, the space 3b formed in the movable portion 3A has a bent and bent shape of the movable portion 3A. Even if there is a change, the space is such that the vibration transmission wire 6 does not come into contact with the movable portion 3A.
Unlike the fixed portion 3B, the movable portion 3A needs to be provided with an ejector 11, and the vibration transmission wire 6 is provided so as not to contact the ejector 11 and the like.
In the second embodiment, the bending shape of the vibration transmission wire itself changes with the left-right movement of the movable portion 3A, but even if this bending shape changes, at least the right-angled shape does not appear in the bending portion of the vibration transmission wire 6. Arrangement design.

[Third Embodiment]
FIG. 6 shows an injection molding apparatus according to the third embodiment of the present invention.
The injection molding apparatus according to the third embodiment is an apparatus in which the nozzle 15 is disposed in the fixed portion 3B.
Further, the hot water passage leading to the cavity 13 is made two (that is, two sprue bushings 16 are provided), which is suitable when the molded product is relatively large.
Compared to the first embodiment, the structure of the fixed portion 3B is complicated, but the vibration transmission wire 6 that couples the vibrator 7 and the nested die 4 is disposed so as not to contact through the space 3a in the fixed portion 3B.

[Fourth Embodiment]
FIG. 7 shows an injection molding apparatus according to the fourth embodiment of the present invention.
The injection molding apparatus according to the fourth embodiment is an example in which the main mold 3 includes a so-called multiple mold (here, two molds).
Therefore, since two cavities 13 are formed independently, the nesting die 4 corresponding to each of the cavities 13 is arranged in the fixed portion 3B.

Further, the ejector 11 also has a structure that can project the molded product 17 molded in each cavity at a stroke in the movable portion 3A.
A space 3a is formed in the fixed portion 3B, and two vibration transmission wires 6 for transmitting ultrasonic vibration from the vibrator 7 to each nested mold 4 are disposed in the space 3a. The transmission wire 6 is disposed so as not to contact the fixed portion 3B.

FIG. 8 is a diagram showing a molding process for molding two molded products.
FIG. 8A is a view showing a state immediately after the mold is clamped and the cavity 13 is filled with resin.

The ultrasonic vibration oscillated from the vibrator 7 by the ultrasonic oscillator 8 is transmitted to the nested mold 4 through the vibration transmission wire 6.
While the cavity 13 is filled with the resin material, ultrasonic vibrations are transmitted to the two nested molds 4 and the resin material filled in the cavities 13 in each nested mold is heated.
Also in this case, first, frictional heat is generated at the interface between the cavity inner wall and the resin material, the heat is transmitted to the surroundings, and as a result, the entire resin material is heated.

After the resin material is filled, the oscillation of the ultrasonic vibration is stopped, the pressure is maintained for a certain time, and the resin material is solidified.
Meanwhile, the nested mold 4 is cooled together with the main mold 3 by a cooling means (not shown), and the temperature of the resin material in the cavity is also lowered.
Also in this case, since the volume of the nested mold 4 is small, the heat capacity is naturally small, and the nested mold 4 is efficiently cooled together with the cooling of the main mold 3.

After the resin material is solidified, mold opening is performed as shown in FIG.
At this time, the molded product 17 is attached to the movable portion 3A.
Next, as shown in FIG. 8C, the ejector 11 is projected by the knock member 12, and the projection 11 a of the ejector 11 projects the two molded products 17 to release them.
The two molded products 17 taken out are integrated with a resin material via a burr 17a (sprue, runner), which is cut off in a later process, and at the same time, the burr 17a is removed.
This completes the one-cycle molding, and the mold is clamped to start the next new cycle injection process.

Although the present invention has been described above, the present invention is not limited to the above-described first to fourth embodiments, and various other modifications can be made without departing from the essence thereof. Needless to say.
In the first, third, and fourth embodiments described above, the example in which the nesting die 4 is not provided on the movable portion 3A side but the nesting die 4 is provided on the fixed portion 3B side has been described, but the nesting die 4 is provided on the movable portion 3A side. A mold 4 may be provided.
Further, in order to transmit the ultrasonic vibration to the nested mold 4, the number of vibrators 7 corresponding to the number of the nested mold 4 may be used or may be shared.
Similarly, the same applies to the relationship between the nested mold 4 and the ultrasonic oscillator 8 and between the vibrator 7 and the ultrasonic oscillator 8.

FIG. 1 is an explanatory view showing an injection molding apparatus according to the first embodiment of the present invention. FIG. 2 is an explanatory view showing a method of connecting the vibration transmission wires shown in FIG. FIG. 3 is an explanatory view showing a process until an injection molded product is formed by the injection molding apparatus shown in FIG. (A) shows a state where the mold is clamped, (B) shows a state where the mold is opened, and (C) shows a state where the molded product is knocked out. FIG. 4 is an explanatory view showing a nested temperature change. FIG. 5 is an explanatory view showing an injection molding apparatus according to the second embodiment of the present invention. FIG. 6 is an explanatory view showing an injection molding apparatus according to the third embodiment of the present invention. FIG. 7 is an explanatory view showing an injection molding apparatus according to the fourth embodiment of the present invention. 8A and 8B are explanatory views showing steps until an injection molded product is formed by the injection molding apparatus shown in FIG. 7, wherein FIG. 8A is a state where the mold is clamped, FIG. 8B is a state where the mold is opened, and FIG. Indicates the state in which the molded product is knocked out.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Movable side part 2 Fixed side part 3 Main type 3A Movable part 3B Fixed part 3a, 3b Space 4, 4A, 4B Nested type 5 Connection member 6 Vibration transmission wire 6a Connector part 7 Vibrator 7a Pin 8 Ultrasonic oscillator 11 Ejector 11a Protruding part 12 Knock member 13 Cavity 15 Nozzle 16 Sprue bush 17 Molded product 17a Burr

Claims (8)

The main mold is provided with a nested mold having a cavity,
One end of the vibration transmission wire is connected to the nesting type through the space,
A vibration generating unit capable of generating ultrasonic waves is connected to the other end of the vibration transmission wire,
An injection molding apparatus characterized in that a nested mold is vibrated from the vibration generating section via a vibration transmission wire. The vibration generator is
An ultrasonic oscillator capable of generating an ultrasonic electric signal;
A vibrator that is vibrated by an electrical signal from the ultrasonic oscillator;
The injection molding apparatus according to claim 1, comprising:   The injection molding apparatus according to claim 1 or 2, wherein the vibration transmission wire and the nesting die are connected via a block-shaped connecting member. A nesting mold is provided for each of the movable part and the fixed part of the main mold,
The injection molding apparatus according to any one of claims 1 to 3, wherein a vibration transmission wire is connected to each of the nesting die of the movable part and the nesting die of the fixed part. The movable part or fixed part of the main mold is provided with a plurality of nested molds,
A vibrator is connected to each of the plurality of nested types via a vibration transmission wire,
The injection molding apparatus according to any one of claims 1 to 3, wherein the plurality of vibrators are controlled by a single ultrasonic oscillator.   The injection molding apparatus according to any one of claims 1 to 5, wherein the vibration transmission wire can be bent and deformed.   An injection molding method characterized in that ultrasonic vibration is transmitted to a nested mold through a vibration transmission wire from a vibration generating portion separated from the nested mold having a cavity provided in an injection molding apparatus. 8. The injection molding method according to claim 7, wherein the ultrasonic vibration is applied from a stage before the resin material is filled into the cavity to a time point when the filling is completed.

Images