JP3011541B2 - Composite molding method and molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite molding method and a molding machine therefor. More specifically, the present invention relates to a composite molding method suitable for composite molding using a thermosetting resin and a molding machine therefor.

[0002]

2. Description of the Related Art Conventionally, in the field of injection molding, composite molding has been performed in which molding is carried out using multiple layers of different resins, and a thermoplastic resin is used for this. Further, as an injection molding machine for performing such composite molding, FIG.
As shown in the figure, an injection channel switching device (10) with a built-in cylinder portion installed at the center, and first and second connection cylinders (10) installed in parallel on both sides of the injection channel switching device (10). 11) a first heating cylinder (13) and a second heating cylinder (14) connected by (12),
Each injection device (17) (1) heats and kneads the resin with the screws (15) and (16) in each heating cylinder, and injects the heated and melted resin.
The composite injection molding machine (19) mainly composed of 8) is widely used.

[0003] The injection path switching device (1
0) is an outer cylinder (10a) for injection and injection of a first resin, an inner cylinder (10b) for injection and injection of a second resin, as shown in FIG. A first resin passage between the inner periphery of the outer cylinder (10a) and the outer periphery of the inner cylinder (10b);
(t1), and the second resin passage (t2) is formed by the inner periphery of the inner cylinder (10b) and the outer periphery of the needle (10c). The first resin passageway (t1) is closed by contacting the outer peripheral surface of the front end of the inner cylindrical body (10b), and the second resin passageway is formed by the inner peripheral surface of the distal end portion of the inner cylindrical body and the advanced needle (10c).
(t2) is configured to be closed.

[0004] The above-mentioned switching type nozzle structure has a disadvantage that the resin retention amount is increased due to the complicated structure. In addition, due to such a structure, it is difficult to use a thermosetting resin as it is in place of the thermoplastic resin.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite injection molding method in which the amount of resin retained in an injection mechanism is small, and any resin can be easily used regardless of thermoplastic resin or thermosetting resin. It is to provide a composite molding method and a molding machine therefor.

[0006]

According to the invention of claim 1 of the present application, " kneading and plasticizing the molding resin "
Multiple plasticizers that can be sent out from the outlet (54)
A mechanism (5) and a predetermined amount of the plasticized resin are measured and
Using an injection mechanism (4) that can inject oil from the injection nozzle (44).
In a composite molding method, the resin plasticized in each of the plurality of plasticizing mechanisms (5) according to the filling pattern into the mold (3) is injected from each of the outlets (54) through the injection nozzle (44). After the injection mechanism (4) is measured in a predetermined amount and held in a multilayer state,
A composite molding method characterized by injecting into the mold (3) from the injection mechanism (4) to perform composite molding. "

[0007] In the composite molding method of the present invention, the injection mechanism
In (4), a plurality of resins are selected according to the filling pattern in the mold (3), and the amount of each resin is used in an amount sufficient to form each molded layer of the final multilayer molded article. The resin to be used may be any resin as long as it can conform to the following injection conditions. For example, a thermosetting resin, a thermoplastic resin, and the like are preferable.

[0008] Each of the above resins is used in a plasticized state, and the plasticized state is selected such that the resin has fluidity that can be injected and has such a viscosity that the resins do not mix with each other. . By maintaining such fluidity, a multilayer state in the injection mechanism (4) can be maintained. As described above, regarding the plasticization of the resin, an appropriate plasticizing means is selected depending on the type of the resin to be used, such as melting by heating or adding a plasticizer.

Also, an injection mechanism for injecting each of the above resins by a predetermined amount.
(4) It is preferable to provide a measuring means for setting a predetermined amount in advance and controlling the intake mechanism based on the set amount so as to take it into the injection mechanism (4). Is referred to.

According to the invention of claim 2 of the present application, a molding machine for carrying out the above-mentioned composite molding method is a kneading and plasticizing kneading mold (3) and a molding resin, and an outlet ( 54)
A plurality of plasticizing mechanisms (5) configured so as to be able to be sent out, and the plasticized resin is allowed to flow from the injection nozzle (44) into the injection cylinder (45), and a predetermined amount thereof is measured and can be injected. An injection device (4), wherein the injection device (4) has an injection nozzle
(44) The sprue (33) of the molding die (3) or each plasticizing mechanism (5)
Positioning means arranged at a position facing the air outlet (54)
(43) and a connecting means (42) capable of connecting the injection nozzle (44) to either the sprue (33) or each of the outlets (54) at each opposing position. (1)] is provided.

The molding die (3) provided in the molding machine (1) of the present invention has a sprue (33) that can be joined to the tip of an injection nozzle (44) of an injection device (4) described later. Other than having, a normal molding die including a fixed die (31) and a movable die (32) can be used.

The plasticizing mechanism (5) provided in the molding machine (1) of the present invention can supply a predetermined molding resin, and knead and knead the resin.
It is configured to be plasticizable and deliverable. The set number of the plasticizing mechanism (5) is preferably used based on the type of resin selected according to the intended pattern of the composite molding.For example, when performing sandwich molding, the skin layer resin and the core layer are used. Two plasticizing mechanisms for resin (5A) (5B)
Is used. The outlet (54) of each plasticizing mechanism (5) is
It is formed in a shape that can be joined to the tip of an injection nozzle (44) of an injection device (4) described later.

An injection device used in the molding machine (1) of the present invention.
(4) is an injection cylinder (45) for holding the resin, an injection drive (46) for filling and sending the resin into the injection cylinder (45), and an injection cylinder (45) for the molding die. An injection device main body (41) mainly composed of a sprue (33) of (3) and an injection nozzle (44) for connection with the outlet (54) of the plasticizing mechanism (5); ) And a connecting means (42) are preferable.

The injection drive section (46) includes a plunger (46a) reciprocating in the injection cylinder (45), and the plunger (46a).
, A plunger drive section (46b) for driving the drive section, an operation control section (48) for controlling the drive section, and each resin amount for a plurality of intended resins can be set in advance.
There is provided a weighing means (47) capable of outputting information on the retraction drive of the plunger (46a) to the operation control section (48) so as to fill the inside of the plunger (5).

The positioning means (43) includes an injection device (4)
Any configuration is possible as long as the injection nozzle (44) at the tip of the injection cylinder is arranged to face the sprue (33) of the molding die (3) or the outlet (54) of each plasticizing mechanism (5). You may. As an example of the configuration, each delivery port (54) of each plasticizing mechanism (5) and the sprue (33) of the molding die (3) are arranged at the same height, and the injection device body (41) is moved up and down. A vertical rotation mechanism that is rotatable and can be fixed at an arbitrary height and angle is attached, and the injection nozzle (4) stopped at an arbitrary angle with the rotation center of this vertical rotation mechanism.
Each plasticizing mechanism (5) at the position facing the tip of 4)
And a configuration in which a molding die (3) is arranged. In the above configuration example, the outlet (5
4) If the sprue (33) of the molding die (3) and the nozzle port of the injection nozzle (44) are arranged at the same height, the vertical rotation mechanism can be simplified to a rotation mechanism.

Another example of the configuration of the positioning means (43) includes a delivery port (54) of each plasticizing mechanism (5) and a molding die (3).
The sprues (33) are arranged at the same height and on the same line, while the injection device body (41) is parallel so that the injection nozzle port can move on a line parallel to this line. There is a configuration for moving.

The connecting means (4) provided in the injection device (4)
2) The injection nozzle (44) of the injection device (4) is moved to the sprue (33) of the molding die (3) or each plasticizer at each intended opposition position set by the alignment means (43). Each outlet (5
As means 4), means capable of approaching / separating is used, and as an example, a so-called nozzle touch cylinder (42) having a cylinder mechanism is preferably mentioned, but is not limited thereto.

[0018]

According to the invention of claim 1 of the present application, a plurality of plasticized resins are filled in the injection cylinder of the injection mechanism in a layered state by a predetermined amount in accordance with a filling pattern into a mold. By injecting them, a single injection sequentially injects and fills the mold in the order of the multilayer arrangement in the mold, thereby performing composite molding.

According to the invention of claim 2 of the present application, first, the injection device (4) is moved so that one plasticizing mechanism (5
The injection nozzle (44) is connected to the delivery port (54A) of A) after facing,
The first resin (JA) plasticized from the plasticizing mechanism (5A) in this state
The injection nozzle (44) of the injection device (4).
The plasticized first resin (JA) flows into the injection cylinder (45) through the opening. When the inflow amount reaches a predetermined amount, the inflow operation is stopped.

Next, the injection device (4) is moved to be connected to the outlet (54B) of another plasticizing mechanism (5B) after being opposed thereto, and in this state, the plasticizing mechanism (5B) and the injection device are operated in the same manner as described above. If (4) is caused to flow in, the second plasticized resin (JB) flows into the injection cylinder (45) while being in contact with the first resin (JA), and is stopped at a predetermined amount. By repeating such an operation, the plurality of resins plasticized according to the filling pattern in the mold are held in the injection cylinder (45) while maintaining the layer state.

Next, the injection device (4) is moved to connect the injection nozzle (44) to the sprue (33) of the molding die (3) after being connected thereto. The resin is injected into the mold (3). When the injection operation is further continued, the next resin is injected and is injected onto the previous resin injection layer. In this way, each resin held in a multilayer state in the injection cylinder (45) is injected according to the order, and a resin filling layer based on an intended pattern is formed in the molding die (3). The Rukoto.

[0022]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. Embodiment 1 FIG. 1 is a plan view of an example of a composite injection molding machine for performing a composite molding method of the present invention, and FIG. 2 is a schematic side view of a main part thereof. In these figures, the composite injection molding machine (1) includes a mold clamping mechanism (2) erected on a molding table (6), and a molding die (3) attached to the mold clamping mechanism (2). It mainly comprises an injection mechanism (4) rotatably mounted on the molding table (6) and two plasticizing mechanisms (5) (5) arranged side by side with the mold clamping mechanism (2). ing. In addition,
(7) is a front operation panel.

The mold clamping mechanism (2) includes tie bars (22) provided to form pistons in four cylinder portions (21) embedded in the molding table (6), and tie bars (22). Fixed die plate (2
3) and a movable die plate (24) attached to the tip of each tie bar (22).
By driving each tie bar (22) with a piston, each tie bar (22) slides in each insertion hole (25) of the fixed die plate (23), and the movable die plate (24)
(23) can be approached or separated.

The molding die (3) is a fixed die plate (23)
And a movable mold (32) attached to a movable die plate (24), and a sprue (33) is provided on the parting surface of the injection mechanism (4). Is provided. Note that the opening end of the sprue (33) is formed in a shape that makes it easy to connect the tip of the injection nozzle (44) of the injection mechanism (4) described later.

The injection mechanism (4) has an injection nozzle (44) formed at the tip thereof and stores an injection resin. The injection cylinder (45) is filled with resin and is sent out. Main body (41) comprising an injection drive section (46), and the main body (41) of the injection mechanism is reciprocally driven on one axis to move the injection nozzle (44) into the sprue of the molding die (3). (33) or a nozzle touch cylinder (42) to be approached / separated to join with the outlet (54) of each plasticizing mechanism (5), and this nozzle touch cylinder (42) is horizontally placed on the molding table (6). And a rotation mechanism (43) rotatably supported.

The injection drive section (46) includes a plunger (46a) reciprocating in the injection cylinder (45), and the plunger (46a).
A driving cylinder (46b) that reciprocates the resin by hydraulic pressure, a measuring means (47) capable of presetting the amount of each resin to be measured in the injection cylinder (45) for a plurality of intended resins, and a measuring means (4
An operation control section (48) is provided which drives the plunger (46a) backward in the order set in (7), stops the plunger (46a) for each set amount, and controls the injection drive of the plunger (46a).
The weighing means (47) is configured to output to the operation control unit when the plunger (46a) is driven backward.

The nozzle touch cylinder (42) is connected to the injection mechanism main body (41) and reciprocates in the cylinder. A plunger (42a), a driving means (not shown) for driving the plunger (42a) by hydraulic pressure, It mainly comprises a pair of guides (42b) (42b) that support the reciprocating movement of the injection mechanism main body (41) in accordance with the driving of the plunger. Therefore,
If oil is introduced into the forward working space (42c) of the cylinder (42) and oil is discharged from the reverse working space (42d) such that hydraulic pressure is applied to the forward working space (42c), the plunger (42a) becomes a molding die. (3) side, whereby the injection mechanism main body (41) is guided (42b) (42b)
Along with the molding die (3).
The separating operation is performed by introducing and discharging hydraulic pressure in the opposite direction to the above.

The two plasticizing mechanisms (5) have the same configuration, and one is represented as (5A) and the other as (5B).
Each of them includes a hopper (not shown) that can arbitrarily supply a predetermined raw material resin and its additive, kneading cylinders (51A) and (51B) provided with heating means, and kneading screws ( 52A and 52B, and oil motors (53A) and (53B) that rotationally drive the respective kneading screws. Outlets (54A) (54B) are formed at the tip of each kneading cylinder, and the shape of each outlet (54A) (54B) is the same as the tip of the injection nozzle (44) of the injection mechanism (4). It is formed in a shape that can be connected.

The composite injection molding machine configured as described above
Regarding (1), the operation will be described by taking sandwich molding using a thermosetting resin as an example. First, the thermosetting resin (JA) for forming the skin layer is prepared for the plasticizing mechanism (5A), and the thermosetting resin for forming the core layer (JB) is prepared for the plasticizing mechanism (5B). deep.

At this time, the measuring means (48) of the injection mechanism (4) is also used.
In, thermosetting resin for skin layer formation (JA) → thermosetting resin for core layer formation (JB) → thermosetting resin for skin layer formation (J
Set each inflow in the order of A). In this case, the inflow of the last resin (JA) is set to an amount sufficient to form the skin layer of the obtained composite molded product, and the inflow of the first resin (JA) is set to the core layer after injection. Is set to cover the area. In addition, oil is introduced into the injection side space (46c) of the drive cylinder (46b) of the injection mechanism
The oil is discharged from (46d) to advance the plunger (46a).

When the above setting is completed, first, the injection mechanism
(4) is rotated by the operation of the rotation mechanism (43), so that the tip of the injection nozzle (44) faces the delivery port (54A) of the plasticizing mechanism (5A). Next, the nozzle touch cylinder (42) is driven close to connect the tip of the injection nozzle (44) to the outlet (54A) of the plasticizing mechanism (5A), and then the plasticizing mechanism (5A) is driven to feed. The resin (JA) is delivered from the outlet (54A), and the plunger (46a) is moved backward by the injection drive unit (46).
This causes the resin (JA) to flow into the injection cylinder (45), but when the output from the metering means (47) reaches a preset amount, the retreat operation of the plunger (46a) is stopped.

After stopping the plunger (46a), the plasticizing mechanism (5)
A) is stopped, and the nozzle touch cylinder (42) is moved away to separate the injection mechanism main body (41) from the plasticizing mechanism (5A), and then the rotation mechanism (43) is operated to move the injection nozzle (44).
After facing the outlet port (54B) of the plasticizing mechanism (5B), the nozzle touch cylinder (42) is operated in proximity to connect the injection nozzle (44) to the outlet port (54B). In this state, the plasticizing mechanism (5
B) is driven to send out the resin (JB) from the delivery port (54B), and the plunger (46a) is moved backward again. As a result, the resin (JB) flows into the injection cylinder (45) following the resin (JA) already stored. This inflow of the resin (JB) continues until the amount set in the measuring means (48) is reached, and when the amount reaches the predetermined amount, the retreat operation of the plunger (46a) is stopped.

After stopping the plunger (46a), the plasticizing mechanism (5)
While stopping (B), the nozzle touch cylinder (42) is operated to separate the injection mechanism main body (41) from the plasticizing mechanism (5B), and then the rotation mechanism (43) is operated to operate the injection nozzle (44).
After again facing the outlet (54A) of the plasticizing mechanism (5A),
Operate the nozzle touch cylinder (42) close to the injection nozzle (4
4) is connected to the outlet (54A). In this state, a predetermined amount of the resin (JA) flows into the injection cylinder (45) in the same manner as described above. Through the above series of operations, the injection cylinder (45) of the injection mechanism main body (41) is held in a three-layer configuration of JA-JB-JA.

Next, the nozzle touch cylinder (42) is again moved to separate the injection nozzle (44) from the plasticizing mechanism (5A), and then the injection mechanism main body (41) is rotated by the rotating mechanism (43). The injection nozzle (44) and the sprue (33) of the molding die (3)
After that, the nozzle touch cylinder (42) is operated in proximity to connect the injection nozzle (44) to the sprue (33). In this state, the plunger (46a) is moved forward to inject all the resin layers held in the injection cylinder (45). By this injection operation, first, the resin (J) held at the tip end in the injection cylinder (45)
A) fills the skin layer and then injects the injected resin (J
Filled core layer by B), finally the rest of the resin (EN) is closed injection traces of being injection core layer, complete the mold (3) in as shown in FIG. 3 Each resin is filled in a sandwich shape. Thereafter, it is subjected to molding conditions to obtain a complete sandwich molded product.

[0035]

According to the present invention, according to the present invention, without requiring a nozzle mechanism of a conventional such complex structures, even using a throat resins such as a simple configuration can perform a composite molding. Composite molding such as sandwich molding can be easily performed using a thermosetting resin. Since the plasticizing mechanism and the injection mechanism are independent from each other, it can be designed according to the properties of the resin using the plasticizing mechanism. For example, in the case of a thermosetting resin such as rubber having a long vulcanization time, it is small. Can be designed. If only one plasticizing mechanism is used, normal molding can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an example of a composite injection molding machine that performs a composite method of the present invention.

FIG. 2 is a schematic side view of a main part of the molding machine of FIG.

FIG. 3 is a schematic side view of a main part illustrating an injection state.

FIG. 4 is a schematic plan view of a main part of a conventional composite injection molding machine.

FIG. 5 is a schematic sectional view of a main part of the composite injection molding machine of FIG. 4;

[Explanation of symbols]

(1)… Compound injection molding machine (2)… Molding mechanism (3)… Molding mold (4)… Injection mechanism (5A) (5B)… Plasticization mechanism (6)… Molding table (22)… Tie bar (23) ... fixed die plate (24) ... movable die plate (31) ... fixed type (32) ... movable type (33) ... sprue (41) ... injection mechanism main body (42) ... nozzle touch cylinder (43) ... rotation Mechanism (44) Injection nozzle (45) Injection cylinder (46) Injection drive unit (47) Measurement unit (48) Operation control unit (42a) (46a) Plunger (54A) (54B)
Outlet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-2764 (JP, A) JP-A-50-156567 (JP, A) JP-A-50-9661 (JP, A) JP-A 50-156 8854 (JP, A) JP-A-49-27550 (JP, A) JP-A-50-139,849 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/00-45 / 24 B29C 45/46-45/84

Claims (3)

(57) [Claims] 1. Kneading, plasticizing and sending out molding resin
A plurality of plasticizing mechanisms configured to be delivered from the mouth,
Weighed a predetermined amount of the resin
This is a composite molding method using an injection mechanism capable of injecting, wherein the injection is performed in a plurality of plasticizing mechanisms according to a filling pattern in a mold.
Through the injection nozzle from the delivery port to respectively plasticized resin
A composite molding method comprising: weighing a predetermined amount in an injection mechanism, holding the multilayer in a multilayer state, and then injecting the injection mechanism into a mold to perform composite molding. 2. (a) a molding die, (b) a plurality of plasticizing mechanisms configured to knead and plasticize a molding resin so as to be able to be sent out from an outlet, and (c) a plasticized resin. And an injection device capable of measuring a predetermined amount thereof and injecting the same into the injection cylinder from the injection nozzle. A composite injection molding machine comprising: positioning means arranged at a position facing an outlet; and connecting means capable of connecting an injection nozzle to either a sprue or each delivery port at each facing position. 3. An injection nozzle of an injection device is disposed so as to be substantially flush with a sprue of a molding die and an outlet of each plasticizing mechanism, and a positioning means moves the injection nozzle in a predetermined direction. 3. The composite injection molding machine according to claim 2, further comprising a rotation mechanism that can be rotated and fixed arbitrarily.