JP5083652B2 - Method for molding laminated molded product and mold for molding - Google Patents

Description

  The present invention relates to a molding method for obtaining a laminated molded product by injection molding a resin into a laminated state by primary molding and secondary molding using a slide mold, and a molding die used in this molding method. .

For example, Patent Document 1 proposes a molding method for obtaining a laminated molded product by injection molding a resin into a laminated state by primary molding and secondary molding using a slide mold.
This molding method uses a fixed mold having a slide mold in which two first and second recesses are formed, and a movable mold in which one recess is formed. For the primary molding, a molten resin is filled into a cavity formed by the first concave portion of the slide mold and the movable concave portion, and for the secondary molding, the primary molded product and the second of the slide mold are used. This is a method of filling a cavity formed by the recesses with a molten resin to obtain a laminated molded product.

The mold used in the conventional method for forming a laminated product includes a fixed mold sprue formed so as to cross the fixed mold plate and communicates with the nozzles of the primary molding and secondary molding injection units. A slide-type sprue hole formed in the slide mold is provided through the fixed-type sprue hole. Then, the molten resin is injected and filled into the primary molding cavity and the secondary molding cavity from the sprue hole communicating with the nozzle, and a laminated product is molded.
By the way, since the secondary molding cannot be performed in the state in which the sprue is left in the primary molded product in the conventional method for forming a laminated product using a mold, a molding method and a mold structure in which no sprue or runner is formed. Required.
JP 2000-141406 A

However, in a molding method in which no sprue or runner is formed, a die having a hot runner or a hot tip must be used for the fixed-type sprue and the slide-type sprue. The structure is complicated and expensive. Furthermore, since the resin is supplied to the slide-type sprue hole formed in the slide mold through the fixed-type sprue hole formed in the fixed plate, there is a problem that it is difficult to seal the resin and the resin leak easily occurs. Further, in the configuration in which the slide mold is arranged on the movable mold, it is difficult to fill the cavity with the resin for secondary molding.
An object of the present invention has been made in view of the above-described conventional problems, and is to provide a molding method of a laminated molded product in which a mold structure is simplified and resin leakage hardly occurs, and a mold used for the lamination molding. is there.

According to a first aspect of the present invention, there is provided a method for forming a laminated molded article using a slide mold in which a slide member having at least two cavity surfaces is provided on one of a fixed mold and a movable mold. If a molding method for molding the laminate by the secondary molding, by disposing the sliding member to the fixed die, the filling of the molten resin into the cavity in the primary molding and secondary molding, the fixed The first resin flow path is provided through the second resin flow path provided on the movable parting surface.

According to a second aspect of the present invention, there is provided a method for forming a laminated molded article using a slide mold in which a slide member having at least two cavity surfaces is provided on one of a fixed mold and a movable mold. If a molding method for molding the laminate by the secondary molding, by disposing the sliding member to the movable mold, filling the molten resin into the cavity in the primary molding and secondary molding, the fixed The first resin flow path is provided through the second resin flow path provided on the fixed parting surface.
According to a third aspect of the present invention, there is provided a method for molding a laminated molded product according to the first or second aspect of the invention, comprising an injection unit for primary molding and secondary molding, and primary molding. Used an injection unit for primary molding and a secondary molding unit for secondary molding.

Method of molding a multilayer molded article according to claim 4 of the present invention is the invention according to claim 3, one of the injection unit of the primary-molding or for a secondary molding, foaming agent are mixed The molten resin was used.
According to a fifth aspect of the present invention, there is provided a method for forming a laminated molded product according to any one of the first to fourth aspects , wherein the fixed mold or the movable mold has a predetermined shape. The outer skin material was inserted and laminated.

A molding die for a laminated molded product according to claim 6 of the present invention is a molding die for a laminated molded product comprising a slide member and molding the laminated product by primary molding and secondary molding. A fixed mold having the slide member and a movable mold, wherein the fixed mold is formed with a first resin flow path for supplying a molten resin into the cavity, and the movable mold parting surface has a The second resin flow path communicating with the first resin flow path provided in the fixed mold is formed.
A molding die for a laminated molded product according to claim 7 of the present invention is a molding die for a laminated molded product comprising a slide member and molding a laminated product by primary molding and secondary molding. A fixed mold and a movable mold provided with the slide member , wherein the fixed mold is formed with a first resin flow path for supplying a molten resin into the cavity, and on the parting surface of the fixed mold Has a configuration in which a second resin flow path communicating with the first resin flow path is formed.

In the molding method of the laminated molded product according to the present invention, the filling of the molten resin into the cavity in the primary molding and the secondary molding passes through the first resin flow path provided in the fixed mold, and the movable mold or This was performed through a second resin flow path provided on the fixed parting surface. By providing the second resin flow path on the fixed or movable parting surface, it is possible to fill the cavity with molten resin without providing a hot runner on the slide mold.
In addition, since the gate is disposed at the end of the outer surface of the laminated molded product , the trace of the gate does not remain on the outer surface of the laminated molded product , and the effect that the design of the laminated molded product is not restricted can be exhibited.

Moreover, as molded using two injection units for the primary molding and secondary molding. By providing the two injection units, it is possible to obtain a laminated molded product having different materials in primary molding and secondary molding, or a laminated molded product of colored resin and transparent resin.
In addition, a resin in which a foaming agent is mixed is used in either one of the injection units. It is possible to form a laminated molded product that has a foam layer, has a soft feeling, is light in weight, and has excellent heat insulation and sound insulation.
In addition, a skin material having a predetermined shape is inserted into the cavity and laminated. By inserting the skin material, the surface of the molded product is decorated, and a laminated molded product excellent in design can be obtained.

A mold for molding a multilayer molded product according to the present invention includes a second mold that includes a slide member in a fixed mold, and communicates the first resin flow path with the fixed mold and the first resin flow path with the movable parting surface. The resin flow path was provided. By providing the resin flow paths on the fixed and movable parting surfaces, the mold structure can be simplified and the cost of the mold can be reduced. Further, since no resin is supplied to the cavity via the slide member , no resin leakage occurs between the fixed mold and the slide member .
Further, the slide member is provided in the movable mold, the first resin flow path is provided in the fixed mold, and the second resin flow path is provided on the fixed mold parting surface and communicates with the first resin flow path. Since the first and second resin flow paths are provided in the fixed mold, the mold structure can be simplified and the cost of the mold can be reduced.
Further, when the flow length of the resin flow path is shortened and the molding material is changed, the amount of material is small and the process can be performed in a short time. In addition, it is possible to perform laminate molding with little resin pressure loss.

  Hereinafter, embodiments of a method for molding a laminated molded product and a mold for laminated molding according to the present invention will be described. However, the present invention should not be construed as being limited thereto, and the scope of the present invention is not limited. Various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope. For example, the drawings show preferred embodiments of the present invention, but the present invention is not limited by the information shown in the drawings. In practicing or verifying the present invention, means similar to or equivalent to those described in the present specification can be applied, but preferred means are those described below. In the following description, general techniques, known techniques, and general-purpose techniques are omitted.

First described embodiment of the present invention. FIG. 1 is a diagram showing a molding process of an embodiment, and a mold is schematically shown in a sectional view. 2 is a cross-sectional view taken along the line XX in FIG. 1B and the line YY in FIG. 1D, and shows the mold positions of the primary molding and secondary molding of the slide mold. . FIG. 3 is a diagram showing a molding process according to another embodiment, in which a mold is schematically shown in a sectional view. Hereinafter, a description will be given with reference to FIGS. 1, 2, and 3.

FIG. 1A shows a state in which the mold according to the embodiment is opened. The mold is basically composed of a movable mold 10 and a fixed mold 20, and a slide member 30 is a fixed mold 20. It is slidably arranged on. The movable mold 10 is attached to a movable platen of a molding machine (not shown), and the fixed mold 20 is attached to a fixed platen of a molding machine (not shown). It is the structure which can be opened and closed.
The slide member 30 disposed on the fixed mold 20 can slide in a direction perpendicular to the mold closing direction of the movable mold 10 in a mold open state by a driving means (not shown).

First resin channels 21 and 22 for primary molding and secondary molding are formed in the fixed mold 20 so as to avoid the slide member 30. In addition, resin channel opening / closing means 23 and 24 are provided at the parting surface side openings of the first resin channels 21 and 22.
The fixed mold 20 includes injection units 41 and 42 for primary molding and secondary molding on the fixed plate mounting surface side, and the nozzle 43 of the injection unit 41 for primary molding has a first resin flow path. 21, the nozzles 44 of the injection unit 42 for secondary molding supply molten resin to the first resin flow path 22, respectively.
On the parting surface side 11 of the movable mold 10, second resin flow paths 12 and 13 for primary molding and secondary molding are formed. The cavity for primary molding communicates with the first resin flow path 21 formed in the fixed mold 20 via the second resin flow path 12 for primary molding, and the cavity for secondary molding is 2 The second resin flow path 13 for next molding is communicated with the first resin flow path 22 formed in the fixed mold 20.

The slide member 30 includes a cavity surface 31 that is closed with the movable mold 10 to form a primary molding cavity, and a cavity surface 32 that forms a secondary molding cavity as shown in FIG. Further, as shown in FIGS. 2A and 2B, the slide member 30 performs secondary molding by moving the primary molding cavity in the upward direction with respect to the molding machine axis after completion of the primary molding. Although it was set as the structure, the structure which moves to a downward direction after primary shaping | molding may be sufficient.
As a means for driving the slide member 30, a fluid pressure cylinder is attached to the fixed mold 20 and a piston rod of the fluid pressure cylinder is fixed to the slide member 30, and a ball screw and a ball nut are driven by an electric motor to rotate. Is preferably used.

Next, the molding method will be described with reference to FIGS. (A) in FIG. 1, the movable mold 10 is mold opening, the slide member 30 indicates a state where it is set to the primary molding cavity surface 31 is driven downward. In this state, the resin channel opening and closing means 23 and 24 are closed.
In FIG. 1B, the movable mold 10 is moved and clamped, a primary molding cavity is formed between the movable mold 10 and the slide member 30, and a predetermined amount is received from the unit 41 for primary injection. The molten resin is injected and filled. At this time, the resin flow path opening / closing means 23 is opened, and the molten resin passes through the nozzle 43, the first resin flow path 21, and the resin flow path opening / closing means 23 from the second resin flow path 12. Filled into mold cavity. Thereby, the primary molded product 51 is obtained.

In FIG. 1C, the opening / closing means 23 of the resin flow path 21 is closed, the mold is closed leaving the primary molded product 51 in the movable mold 10, and the slide member 30 is driven upward to set the secondary molding cavity. It shows the state that was done.
1 (d), the movable mold 10 leaving the primary molded product 51 is moved again and clamped to form a secondary molding cavity between the primary molded product 51 and the slide member 30, and A state in which a predetermined amount of molten resin is injected and filled from the injection unit 42 for secondary injection is shown. At this time, the opening / closing means 24 of the resin flow path 22 is opened, and the molten resin passes through the nozzle 44, the first resin flow path 22, and the resin flow path opening / closing means 24 from the second resin flow path 13. The next molding cavity is filled. Thereby, the secondary molded product 52 is laminated on the outer peripheral surface of the primary molded product 51, and the laminated molded product 50 is obtained.

FIG. 1D shows a state where the opening / closing means 24 of the resin flow path 22 is closed and the movable mold 10 is opened. The laminated molded product 50 is extruded from the mold by an extrusion means (not shown).
Next, the slide member 30 is driven and moved to the primary molding position to start the next cycle.
Although the shape of the gate that is the intersection of the second resin flow paths 12 and 13 and the molded product cavity in the present invention is not shown, a known form such as a tab gate, a film gate, or a fan gate can be used. The first resin flow paths 21 and 22 preferably use hot runners, and the resin flow path opening / closing means 23 and 24 preferably use valve gates or hot chips.

Another embodiment will be described with reference to FIG. 3A shows a state in which the mold according to the embodiment is opened, and the mold is basically composed of a movable mold 60 and a fixed mold 70, and the slide member 80 is a movable mold. 60 is slidably arranged. The movable die 60 is attached to a movable platen of a molding machine (not shown), and the fixed die 70 is attached to a fixed platen of a molding machine (not shown). It is the structure which can be opened and closed.
The slide member 80 arranged on the movable mold 60 can slide in a direction perpendicular to the opening / closing direction of the movable mold 60 in a mold open state by a driving means (not shown).

The fixed mold 70 is formed with first resin flow paths 71 and 72 for primary molding and secondary molding. In addition, resin channel opening / closing means 73 and 74 are provided at the parting surface side openings of the first resin channels 71 and 72.
The fixed mold 70 has injection units 41 and 42 for primary molding and secondary molding on the fixed mold mounting surface side, and the nozzle 43 of the injection unit 41 for primary molding has a first resin flow path. 71, the nozzles 44 of the injection unit 42 for secondary molding supply molten resin to the first resin flow path 72, respectively. Further, second resin channels 76 and 77 for primary molding and secondary molding are formed on the parting surface side 75 of the fixed mold 70.
The primary molding cavity communicates with the first resin flow path 71 formed in the fixed mold 70 via the first molding second resin flow path 76, and the secondary molding cavity is 2 It is configured to communicate with the first resin flow path 72 formed in the fixed mold 70 through the second resin flow path 77 for next molding.

The slide member 80 includes a cavity surface 81 that is closed with the fixed mold 70 to form a primary molding cavity, and a cavity surface 82 that forms the secondary molding cavity shown in FIG. Further, as shown in FIGS. 2A and 2B for reference, the slide member 80 is moved in the upward direction with respect to the molding machine shaft core after the primary molding is completed. However, it may be configured to move in the downward direction after the primary molding.
As a means for driving the slide member 80, a fluid pressure cylinder is attached to the fixed mold 60, and a piston rod of the fluid pressure cylinder is fixed to the slide member 80, or a ball screw and a ball nut are driven by an electric motor to rotate. Is preferably used.

Next, the molding method will be described with reference to FIGS. FIG. 3A shows a state where the movable mold 60 is opened and the slide member 80 is driven downward to set the primary molding cavity. In this state, the resin channel opening / closing means 73 and 74 are closed.
In FIG. 3B, the movable mold 60 is moved and clamped, a primary molding cavity is formed between the fixed mold 70 and the slide member 80, and a predetermined amount is obtained from the unit 41 for primary injection. The molten resin is injected and filled. At this time, the resin flow path opening / closing means 73 is open, and the molten resin passes through the nozzle 43, the first resin flow path 71, and the resin flow path opening / closing means 73 from the second resin flow path 76. Filled into mold cavity. Thereby, the primary molded product 51 is obtained.

In FIG. 3C, the resin flow path opening / closing means 73 is closed, the mold is closed leaving the primary molded product 51 in the fixed mold 70, and the slide member 80 is driven upward to set the secondary molding cavity. Shows the state.
In FIG. 3D, the movable mold 60 is moved again and the mold is clamped, a secondary molding cavity is formed between the primary molded product 51 and the slide member 80, and the unit 42 for secondary injection. The state in which a predetermined amount of molten resin is injected and filled is shown. At this time, the resin flow path opening / closing means 74 is opened, and the molten resin passes through the nozzle 44, the first resin flow path 72, and the resin flow path opening / closing means 74 from the second resin flow path 77. Filled into mold cavity. Thereby, the secondary molded product 52 is laminated on the outer peripheral surface of the primary molded product 51, and the laminated molded product 50 is obtained.

FIG. 3D shows a state where the resin channel opening / closing means 74 is closed and the movable mold 60 is closed. The laminated molded product 50 is extruded from the mold by an extrusion means (not shown).
Next, the slide member 80 is driven and moved to the primary molding position to start the next cycle.
Although the shape of the gate that is the intersection of the second resin flow paths 76 and 77 and the molded product cavity in the present invention is not shown, a known form such as a tab gate, a film gate, or a fan gate can be used. The first resin flow paths 71 and 72 preferably use hot runners, and the resin flow path opening / closing means 73 and 74 preferably use valve gates or hot chips.

Next, foam molding in the embodiment of the present invention will be described. A foaming agent is mixed with one of the injection unit 41 for primary molding or the injection unit 42 for secondary molding and injected into the mold cavity to provide a foam layer and have a soft feeling. It is possible to obtain a molded product that is light in weight and excellent in heat insulation and sound insulation. For example, when a molten resin in which a foaming agent is mixed from the injection unit 41 for primary molding shown in FIG. 1B is filled into the primary molding cavity, the laminated molded product 50 in which the base material becomes a foam layer is obtained. Further, when the molten resin mixed with the foaming agent is filled in the secondary molding cavity from the secondary molding unit 42 shown in FIG. 1 (d), a laminated molded product 50 whose surface layer becomes a foamed layer is obtained. .
And a chemical foaming agent and a physical foaming agent are used for the foaming agent mixed with the said molten resin. The form of foam molding is preferably a full shot method in which a molten resin containing a foaming agent having the same amount as the cavity volume is injected and filled, and then the cavity volume is expanded by a predetermined amount and foamed. In addition, using a gas counter pressure method, in which a gas is filled in a cavity at a predetermined pressure and a molten resin containing a foaming agent having the same volume as the cavity volume is injected and filled, is used in combination with the full shot method. It is further preferable in terms of improving.

Furthermore, the lamination molding of the skin material in the embodiment of the present invention will be described. A skin material having a predetermined shape was inserted into the cavity and laminated. By inserting the skin material, it is possible to obtain a laminated molded product having a decorative surface and excellent design.
For example, when the primary molded product of FIG. 3C is molded and the mold is open, the skin material is attached to the cavity surface 82 of the slide member 80 in a known manner, and the movable mold 60 is moved to perform clamping. . By injection-filling molten resin from the secondary molding injection unit 42 into the secondary molding cavity formed between the primary molded product and the skin material, a laminated molded product is obtained that is decorated with the skin material. It is done.
The foam molding described above may also be used in the lamination molding of the skin material.

In the embodiment of the invention described above, the shapes of the primary molded product 51 and the secondary molded product 52 are similar to each other. However, the shape is not limited to this, and the molded product has a difference in thickness. Furthermore, although the molded product 50 is a box-shaped container, it may be a molded body laminated in a plate shape.
Further, although the mold structure is a flat pressing mold having no spigot part, a half-pressing mold having a spigot part can also be used.

As described above, in the conventional laminate molding method using a slide mold, a laminate molded product could be obtained by sliding and changing the cavity while leaving the primary molded product in the mold. Since the hot runner is incorporated in the slide member and the molten resin is filled into the cavity via the fixed mold, there is a problem that the mold structure is complicated and expensive, and resin leakage is likely to occur. The molding method and the molding die of the laminated product according to the present invention are not provided with a resin flow path in the slide member , but are filled with resin by providing a resin flow path on the fixed mold and the movable parting surface or the fixed mold parting surface. By overcoming the above problems,
And the lamination molded product was able to be shape | molded without the resin leak using the shaping | molding method and molding metal mold | die of this invention.

It is a figure which shows the formation process of embodiment of this invention, and is the figure which showed the metal mold | die typically with sectional drawing. It is sectional drawing cut | disconnected by XX of FIG.1 (b), and YY of FIG.1 (d), and is the figure which showed the metal mold | positioning of the primary shaping | molding of a slide metal mold | die, and a secondary molding. It is a figure which shows the shaping | molding process of other embodiment of this invention, and is the figure which showed typically the metal mold | die with sectional drawing.

Explanation of symbols

10, 60 Movable mold 11, 75 Parting surfaces 12, 13, 76, 77 Second resin flow path 20, 70 Fixed mold 21, 22, 71, 72 First resin flow path 23, 24, 73, 74 Resin Flow path opening / closing means 30, 80 Slide members 31, 82 Primary molding cavities 32, 82 Secondary molding cavities 41 Primary molding injection units 42 Secondary molding injection units 43, 44 Nozzle 50 Laminated molding 51 1 Secondary molded product 52 Secondary molded product

Claims (7)

A molding method for molding a laminated product by primary molding and secondary molding using a slide mold provided with a slide member having at least two cavity surfaces on either one of a fixed mold and a movable mold,
By disposing the sliding member to the fixed die, the filling of the molten resin into the cavity in the primary molding and the secondary molding, as well as through the first resin passage provided in said stationary die, the movable mold The molding method of the laminated molded product performed through the 2nd resin flow path provided in the parting surface. A molding method for molding a laminated product by primary molding and secondary molding using a slide mold provided with a slide member having at least two cavity surfaces on either one of a fixed mold and a movable mold,
By disposing the sliding member to the movable mold, filling the molten resin into the cavity in the primary molding and the secondary molding, as well as through the first resin passage provided in said stationary die, said stationary die The molding method of the laminated molded product performed through the 2nd resin flow path provided in the parting surface. Includes an injection unit for the primary molding and the secondary molding, an injection unit for primary molding in the primary molding, the secondary molding using unit for secondary molding according to claim 1, or claim 2 A method for forming a laminated molded product according to 1. One injection unit of the primary-molding or for a secondary molding, the molding method for the laminated molded article of claim 3 using a molten resin a blowing agent is mixed. The method for forming a laminated molded product according to any one of claims 1 to 4 , wherein a skin material having a predetermined shape is inserted into one of the fixed mold and the movable mold to perform lamination molding. A mold for forming a laminated product comprising a slide member and forming a laminated product by primary molding and secondary molding,
The fixed type provided with the slide member , and a movable type,
The fixed mold is formed with a first resin flow path for supplying molten resin into the cavity,
A mold for molding a laminated molded product in which a second resin flow path communicating with the first resin flow path provided in a fixed mold is formed on the movable parting surface. A mold for forming a laminated product comprising a slide member and forming a laminated product by primary molding and secondary molding,
It consists of a fixed mold and a movable mold with the slide member ,
The fixed mold is formed with a first resin flow path for supplying a molten resin into the cavity,
A mold for molding a laminated molded product, wherein a second resin flow path communicating with the first resin flow path is formed on a parting surface of the fixed mold.

Images