JP4573755B2 - Molding equipment - Google Patents

Description

  The present invention relates to a molding apparatus, and more particularly to an injection molding machine for injection compression molding. Before a molding material in a cavity is solidified, the molten molding material is injected into a cavity in a mold that is clamped. The present invention relates to a molding apparatus provided with a molding die for injection compression molding that advances a nested die part that forms a part of the die to apply a compression force to the molding material.

In general, injection molding is the process of injecting heat into a mold by injecting the heated and melted molding material into a mold below the melting point of the material (actually, the temperature is determined in consideration of deformation and moldability). A processing mode including a step of releasing / curing and transferring and taking out the shape of the mold cavity.
During this process, the molding material flows into the mold and then passes through the spool, runner, gate, into the cavity that creates the product shape, and in some cases enters the overflow that extends from the cavity filling completion part. Stop the flow. Although it is cooled and solidified in this state, the heat is taken away by the mold even while passing through the respective parts before entering the cavity, and the viscosity becomes high. When molding a molded product having a thin part, the molding material is easy to fill from the part other than the thin part due to its flow resistance, and the thin part is in the flow in the cavity, along with the tendency to delay the filling timing. Viscosity increases due to the release of heat from the molding material, and the flow resistance prevents the molding material from completely filling the thin-walled part, the weld line where the molding material that has been shunted to the non-thin part joins again at the thin-walled part, etc. Molding defects such as gas burns and imperfect transfer of the mold surface shape tend to occur in thin parts. These molding defects have been the main cause of not only deteriorating the design of the product appearance but also reducing the strength of the product itself.

Therefore, conventionally, in order to reduce the difference in flow resistance of the molding material due to the thickness difference of the molded product, the volume of the cavity formed by the fixed mold and the movable mold is set larger than the volume of the molded product. In this state, the molten resin is injected, and before the resin in the cavity solidifies, the core mold part that forms a part of the movable mold is advanced, and the volume of the cavity is reduced to a size that matches the shape of the molded product. , Using a compression electric servo motor as a forward / backward drive source for the core mold part, and molding using a molding machine configured to transmit the driving force to the core mold part via a toggle link mechanism. (For example, refer to Patent Document 1).
According to this technique, since the injection is performed in a state where the volume of the cavity is set larger than the volume of the molded product, even in the case of a molded product having a very thin portion, it can be filled with a low injection pressure. In addition, a compression servo motor is used as a compression drive source, and the drive force is transmitted to the core mold part via a toggle link mechanism. In addition, it is said that the position of the core mold part can be accurately controlled by a compression servo motor.

In addition, a hydraulic mechanism for moving the core mold part, i.e., the insert, forward and backward in the molding die is provided on the back of the insert, and the insert is retracted in advance to enlarge the gap between the cavities, and the hydraulic mechanism is installed in anticipation of resin filling. A technique is known in which the insert is advanced by driving and the filled resin is compressed in the plate thickness direction (see, for example, Patent Document 2).
According to this technique, it is not necessary to introduce a special molding machine and mold, and it can be molded by a general-purpose molding machine.

JP-A-9-267367 Japanese Patent Laid-Open No. 7-241891

  However, this type requires a mechanism for operating a servo motor or a hydraulic drive device as a drive source by acquiring a signal from the molding machine, and requires a special specification molding machine. Further, the hydraulic drive device needs to provide a separate hydraulic pressure source, and it is very difficult to adjust the drive timing of the core portion.

  The present invention seeks to obtain a molding apparatus capable of performing stable injection compression molding with a simple configuration and no molding variation.

The molding apparatus according to the present invention has a movable molding block member that constitutes a part of a molding component that is filled with a molding material to mold a molded product, and the molding is performed by moving the molding block member. Provided with a molding apparatus main body that compresses a part of the molding material filled in the structural member to a desired thickness, and provided with a pressure responsive member that responds to a molding pressure for molding a molded product by the molding structural member, The pressure responsive member that is responsive to the molding pressure drives the molding block member, and is a pressure that is responsive to the molding pressure in the molding material flow path connected to the molding material inlet to the molding component. A response member and a link mechanism that amplifies the pressure received by the pressure response member and transmits the amplified pressure to the molding block member to drive the molding block member are provided .

  According to the molding apparatus of the present invention, it is possible to obtain a molding apparatus that can perform stable injection compression molding with a simple configuration and without molding variation.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIG. 1 is a cross-sectional view showing a configuration of a molding apparatus according to Embodiment 1. FIG.

In FIG. 1, a molding die constituting the molding apparatus main body MA is composed of a first mold 1 and a second mold 2 with an abutting surface D as a boundary.
The first mold 1 is provided with a mold inlet 3 for molten molding material and a first molding material flow path 4 extending from the mold inlet 3 to the abutting surface D. A cavity 5 a that defines the outside of the bottom surface of the molded product MP is formed on the abutting surface D of the first mold 1.
On the other hand, the second mold 2 includes, on the abutting surface D, a second molding material flow path 6, a cavity 15b that defines the inside of the side surface and the bottom surface of the molded product MP, and a third molding material flow path. 7 and overflow 8 are formed. The second mold 2 incorporates a nesting block 9 that forms the inside of the compression site CP in the bottom surface of the molded product MP, and forms a part of the cavity 5b.
By bringing the first mold 1 and the second mold 2 configured as described above into close contact with each other at the abutting surface D, the first molding material flow path 4 and the second molding are formed from the mold inlet 3. The material channel 6, the cavity inlet 10, the cavity 5, the cavity outlet 11, the third molding material channel 7, and the overflow 8 are connected in series to form a channel filled with the molding material. Moreover, the cavity 5 which prescribes | regulates the external shape of the molded product MP is comprised by uniting the cavity 5a and the cavity 5b.

However, the above-described nesting block 9 is configured to be able to slide in the direction in which the cavity 5 is compressed in order to compress the compression portion CP during the molding process, and the pressure provided in the second molding material flow path 6. The transmission branch portion 12 fills the molding material, increases the molding pressure, pushes down the pressure transmission rod 13, moves the compression drive rod 16 via the link rod 15 supported by the link column 14, and inserts the nested block. 9 is driven.
The initial position of the cavity block 9 is defined so that the thickness of the compression portion CP is equal to or greater than that of the side surface portion, but is not limited as long as the molding material can be sufficiently filled in the initial position.
Moreover, in this embodiment, although the compression site | part CP is planar shape, a shape is not specifically limited.

  According to such a configuration, it is possible to directly extract the compression timing from the flow behavior of the molding material, and it is possible to eliminate a shift in the compression timing due to molding variation without using a special molding machine or apparatus. Enables easy injection compression molding.

  According to the first embodiment of the present invention, a part of a molding structure comprising a molding die composed of a first mold 1 and a second mold 2 for filling a molding material and molding a molded product MP. And a mold block constituted by the first mold 1 and the second mold 2 by the movement of the molding block member comprising the nesting block 9. A molded product MP comprising a molding apparatus body MA for compressing a part of a molding material filled in a molding component comprising a mold to a desired thickness, and comprising a cavity inlet 10 to the molding component MA A pressure responsive member composed of a pressure transmission rod 13 that responds to a molding pressure in a molding material flow path 6 connected to the material inlet, and a pressure received by the pressure responsive member composed of the pressure transmission rod 13 are amplified and the nesting block is amplified. And a link mechanism consisting of a link rod 15 supported by link struts 14 that transmit to the molding block member 9 and drive the molding block member 9, so that molding is performed in response to the molding pressure. A molding apparatus capable of performing stable injection compression molding without molding variation can be obtained with a simple configuration using a link mechanism that drives the block member by amplifying the pressure of the block member.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a cross-sectional view showing the configuration of the molding apparatus in the second embodiment. FIG. 3 is a cross-sectional view showing a detailed configuration of the actuator according to the second embodiment.
In the second embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 2 is a cross-sectional view for explaining an overview of a molding die according to Embodiment 2 of the present invention. In this configuration, the same molding method as that of the first embodiment is carried out. However, a hydraulic pressure increasing actuator 17 described later is interposed between the compression drive rod 16 and the nested block 9 of the first embodiment shown in FIG. In addition, a larger compressive force is realized.

FIG. 3 is a cross-sectional view showing a detailed configuration of an actuator according to Embodiment 2 of the present invention. The actuator 17 is disposed between the compression drive rod 16 and the nested block 9.
The actuator 17 according to the second embodiment is provided with a temperature adjustment hole 28 in order to maintain the temperature at a set temperature, and a medium supply device (not shown) disposed outside the molding die. ) To form a temperature adjustment circuit. This medium supply device has a function of maintaining the temperature of water at a set temperature. Therefore, water as a temperature adjustment medium is circulated from the medium supply device to the temperature adjustment circuit, and the actuator 17 is held at the set temperature.
The actuator 17 is connected to the compression drive rod 16 that receives the force from the link 15, the pressure receiving rod 18 having a larger cross-sectional area than the compression drive rod 16, and the pressure receiving rod 18, and transmits the force to the cavity block 9. The rod 19, an actuator housing 20 that covers and holds these rods 16, 17, 19, and a fluid medium in a sealed space defined between the actuator housing 20, the compression drive rod 16 and the pressure receiving rod 18. The operation of the sealed pressure transmission part 21, the packing 22 for maintaining the hermeticity in the pressure transmission part 21, the compression driving rod 16, the pressure receiving rod 18 and the transmission rod 19 connected to the pressure receiving rod 18 is completed. It comprises return springs 23 and 24 for retreating to an initial position later.

  Here, the function and operation of each component of the actuator 17 will be described. The pressure transmitting branch portion 12 provided in the second molding material flow path 6 fills the molding material and increases the molding pressure, and the pressure transmission rod 13 is pushed down. The compression drive rod 16 is moved via the pressure transmission unit 21 and transmitted to the pressure transmission unit 21. The pressure transmission unit 21 is filled with machine oil, and pressure is generated by dividing the driving force of the compression drive rod 16 by the projected area of the transmission surface 25 where the compression drive rod 16 and the pressure transmission unit 21 are in contact with each other. . The pressure receiving rod 18 has a protrusion 27 on the pressure receiving surface 26 that is in contact with the pressure transmitting portion 21, so that the machine oil in the pressure transmitting portion 21 spreads over the entire pressure receiving surface 26 by creating a gap with the actuator housing 20. It has become. By receiving the pressure of the pressure transmitting portion 21 at the pressure receiving surface 26, a force is generated by multiplying the pressure of the pressure transmitting portion 21 and the projected area of the pressure receiving surface 26, and the compression driving rod 16 and the transmission rod 19 advance in the same direction. To do. At the same time, the transmission rod 19 drives the nested block 9. Therefore, the cavity block 9 can be driven by the actuator 17 with the force doubled by the projected area ratio of the transmission surface 25 to the pressure receiving surface 26 even with the limited force of the molded product release mechanism attached to the molding machine.

  According to such a configuration, it is possible to directly extract the compression timing from the flow behavior of the molding material, and without using a special molding machine or apparatus, it is possible to eliminate a shift in the compression timing due to molding variation and molding. The molding pressure of the material can be increased and a greater compression force can be generated, enabling good injection compression molding.

  According to the second embodiment of the present invention, a part of a molding structure comprising a molding die constituted by a first mold 1 and a second mold 2 for filling a molding material and molding a molded product MP. And a mold block constituted by the first mold 1 and the second mold 2 by the movement of the molding block member comprising the nesting block 9. A molding product material comprising a molding apparatus main body MA for compressing a part of a molding material filled in a molding component comprising a mold to a desired thickness, and comprising a cavity inlet 10 to the molding component MA A pressure responsive member composed of a pressure transmission rod 13 that responds to a molding pressure in the molding material flow path 6 connected to the inlet, and a pressure received by the pressure responsive member composed of the pressure transmission rod 13 are amplified so that the nested block 9 A hydraulic actuator comprising a hydraulic actuator 17 having a pressure increasing function for transmitting to the molding block member and driving the molding block member comprising the nesting block 9 is provided, so that the molding block is responsive to the molding pressure. It is possible to obtain a molding apparatus that can perform stable injection compression molding without molding variation with a simple configuration using a hydraulic actuator that amplifies and drives a member.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view showing the configuration of the molding apparatus in the third embodiment.
In the third embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and has the same function. In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 4 is a view for explaining an overview of a molding die according to Embodiment 3 of the present invention. In this configuration, the same molding method as in the first and second embodiments is performed, but the molding pressure of the molding material is used only as a compression timing signal, and a cylinder using an external hydraulic pump is used as the compression force. By using it, a larger compressive force is realized.

In FIG. 4, a pressure sensor 29 is provided under the pressure transmission rod 13, and a hydraulic cylinder 30 is provided under the nested block 9. The pressure sensor 29 directly extracts the compression timing from the flow behavior of the molding material, and controls the hydraulic cylinder 30 that receives the hydraulic pressure from the external hydraulic pump.
That is, from the cavity inlet 10 to the cavity 5 via the first molding material channel 4 and the second molding material channel 6 in response to the start of the molding operation in the molding apparatus body MA for molding the molded product MP. When the molding material is supplied, the molding material is filled and the molding pressure increases, the pressure transmission rod 13 is pushed down, and the pressure sensor 29 is activated. By operating the pressure sensor 29, a command signal is transmitted from the pressure sensor 29 to a hydraulic unit (not shown) having an external hydraulic pump, and the hydraulic unit supplies hydraulic pressure from the external hydraulic pump to the hydraulic cylinder 30. The hydraulic cylinder 30 drives the nesting block 9 through a hydraulic piston provided in the hydraulic cylinder 30 by the supplied hydraulic pressure, and performs a compression operation on the compression portion CP.

  According to such a configuration, the compression timing can be more accurately controlled than the control from the conventional injection start signal, and the injection compression molding can be performed without the need for a special / high function molding machine / control device.

  According to the third embodiment of the present invention, a part of a molding structure comprising a molding die composed of a first mold 1 and a second mold 2 for filling a molding material and molding a molded product MP. And a mold block constituted by the first mold 1 and the second mold 2 by the movement of the molding block member comprising the nesting block 9. A molding material flow comprising a cavity inlet 10 into the molding component, comprising a molding apparatus body MA that compresses a part of the molding material filled in the molding component consisting of a mold to a desired thickness. A pressure responsive member comprising a pressure transmission rod 13 that operates the pressure sensor 29 in response to a molding pressure in the molding material flow path 6 connected to the inlet is provided, and a pressure sensor by a responsive operation to the molding pressure of the pressure responsive member. 9 through a hydraulic piston provided in the hydraulic cylinder 30 for supplying pressure from a hydraulic unit composed of a hydraulic unit (not shown) having an external hydraulic piston for deriving the hydraulic pressure to the hydraulic cylinder 30 in accordance with the operation of 9. Since the molding block member is transmitted to the molding block member and driven, the molding variation can be achieved with a simple configuration using a hydraulic device that derives the pressure by the operation of the molding block member that responds to the molding pressure. A molding apparatus that can perform stable injection compression molding without missing the timing of absorption and compression can be obtained.

  In the embodiment according to the present invention, the configurations described in the following items (1) to (3) are shown.

(1) The nesting block 9 is arranged in the cavity 5 portion configured to form the product in the molding die, and the structure can be driven in the thickness direction of the molded product MP, and the molding material is being filled. Alternatively, immediately after filling, in the molding apparatus that drives the nesting block 9 and compresses the molded product MP to a desired thickness, the runner portion configured by the molding material flow path 6 immediately before the molding material reaches the part forming the product. In addition, a pin made of a pressure transmission rod 13 that can be operated when receiving molding pressure is provided, and the pressure of the runner portion constituted by the molding material flow path 6 is amplified and transmitted to the nesting block 9 using the link mechanism 15. A molding die characterized in that the nesting block 9 is driven.
(effect)
With this configuration, no special molding machine (ultra-high-speed injection molding machine, hydraulic compression built-in molding machine, etc.) or apparatus is required, and stable injection compression molding can be performed without being influenced by molding variations.

(2) A sealed space provided with rods 16 and 18 capable of operating at both ends the pressure received by an operating pin composed of a pressure transmission rod 13 disposed in a runner portion constituted by the molding material flow path 6 of the molding die. The fluid block is sealed inside, and the nested block 9 is driven by being transmitted to the nested block 9 via the hydraulic pressure increasing actuator 17 in which the pressure receiving area received from the fluid medium of the rods 16 and 18 is changed. Molding mold.
(effect)
With this configuration, a special molding machine or apparatus is not required, stable injection compression molding is possible without being affected by molding variations, and a larger compression force than that of the link mechanism can be realized.

(3) A pin composed of a pressure transmission rod 13 that can be operated when a molding pressure is applied to the runner portion formed by the molding material flow path 6 immediately before the molding material reaches the part of the molding die that forms the product. A molding die characterized in that it is used as a sensor to sense the timing of compression, and the pressure from an external hydraulic device is transmitted to the nested block 9 to drive the nested block 9.
(effect)
This configuration eliminates the need for a special molding machine, absorbs molding variations during molding, and operates the nested block without losing the timing of compression compared to the conventional control of nested block operation using a timer from the injection start signal. Can be made.

In the molding die according to the embodiment of the present invention, when the cavity block 9 that forms a part of the cavity 5 is configured to be drivable, the runner configured by the molding material flow path 6 receives molding pressure. A pin composed of an operable pressure transmission rod 13 is provided, and the pressure of the runner part constituted by the molding material flow path 6 is amplified by using the link mechanism 15 and transmitted to the nested block 9 so as to miss the compression timing. The insert block 9 is driven without compressing the molded product to a desired thickness.
Further, by operating the hydraulic pressure increasing actuator 17 instead of the link mechanism, the cavity block 9 is driven by increasing the force further.

  According to the molding apparatus according to the embodiment of the present invention, the nesting block 9 is retracted to a thickness that can be filled in advance even in a molded product MP having a thin portion that is not filled with a molding material in normal molding or is difficult to fill. The pressure of the molding material passing through the runner portion constituted by the molding material flow path 6 is transmitted to the nesting block 9 by using the link mechanism 15 or the hydraulic pressure increasing actuator 17, and is increased and compressed to a large force. Can do. Further, since the compression timing is taken out from the flow behavior of the molding material and the link mechanism 15 or the hydraulic pressure increasing actuator 17 is operated, the nested block 9 can be driven with good timing in conjunction with the molding process. Thus, even a molded product having a thin portion that requires a special molding machine or apparatus can be efficiently molded by accurately transferring the shape of the mold surface with a general-purpose molding machine.

It is sectional drawing which shows the structure of the shaping die based on Embodiment 1 by this invention. It is sectional drawing which shows the structure of the shaping die based on Embodiment 2 by this invention. It is sectional drawing which shows the detailed structure of the actuator which concerns on Embodiment 2 by this invention. It is sectional drawing which shows the structure of the shaping die based on Embodiment 3 by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st type | mold, 2nd type | mold, 3 Mold inlet, 4th 1st molding material flow path, 5, 5a, 5b cavity, 6 2nd molding material flow path, 7 3rd molding material flow Road, 8 Overflow, 9 Nesting block, 10 Cavity inlet, 11 Cavity outlet, 12 Pressure transmission branch, 13 Pressure transmission rod, 14 Link strut, 15 Link rod, 16 Compression drive rod, 17 Hydraulic pressure increasing actuator , 18 Pressure receiving rod, 19 Transmission rod, 20 Actuator housing, 21 Pressure transmitting portion, 22 Packing, 23, 24 Return spring, 25 Transmission surface, 26 Pressure receiving surface, 27 Protrusion, 28 Temperature adjustment hole, 29 Pressure sensor, 30 Hydraulic pressure Cylinder, D Colliding surface.

Claims (1)

A molding that has a movable molding block member that constitutes a part of a molding component for molding a molded product by filling a molding material, and is filled into the molding component by the movement of the molding block member A pressure responsive member that responds to a molding pressure by providing a pressure responsive member that responds to a molding pressure for molding a molded product by the molding component, provided with a molding apparatus body that compresses a part of the material to a desired thickness. A pressure responsive member that drives the molding block member by a member and that responds to a molding pressure in a molding material flow path connected to a molding material material inlet to the molding component; and the pressure responsive member. forming shapes device you characterized in that a link mechanism for driving the forming block members is transmitted to the molding block members by amplifying the pressure is subjected.

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