JP7071955B2 - Injection molding mold - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention is a technical field of an injection molding die used for forming a molded product used as a product in a configuration having a fixed mold and a movable mold, and used in a preparatory stage before the formation of the molded product is performed. Regarding.

There is an injection molding die that has a fixed mold and a movable mold and is filled with a molten resin in a cavity that is a space formed by abutting the two to form a molded product used as a product. Such an injection molding die is assembled to an injection molding machine as a part of its structure.

In such an injection molding die, the cavity is filled with a molten resin, and the solidified molten resin is taken out from the cavity by an ejector pin to form a molded product. In an injection molding die, it is desirable that the molded product is formed under the optimum molding conditions, and in order to set the optimum molding conditions, for example, the filling pressure and flow of the molten resin filled in the cavity. The speed and the like are determined according to the type and shape of the molded product to be formed.

Further, in the injection molding die, the cavity is made visible from the outside in the preparatory stage before the molding is formed, and the state of the cavity into which the molten resin is injected is observed to grasp and improve the molding defect. (For example, see Patent Document 1 and Patent Document 2).

Patent Document 1 discloses a technique in which a resin mold in which a molten resin is filled in an internal space is formed of a translucent resin material, and the molten resin can be visually observed from the outside.

In Patent Document 2, the state of the cavity is visualized by using a prism formed of transparent quartz glass.

Japanese Unexamined Patent Publication No. 2019-162883 Japanese Unexamined Patent Publication No. 2010-110999

However, in the technique described in Patent Document 1, since the resin mold for visualizing the flow state of the molten resin is formed by the 3D printer, the manufacturing cost of the resin mold becomes high.

Further, when quartz glass is used for visualizing the cavity as in the injection molding mold described in Patent Document 2, the quartz glass is less likely to be damaged by thermal shock, but it is an expensive material. In addition, there is a problem that the tensile strength is low and it is easily damaged when it receives a mechanical impact.

On the other hand, in the injection molding die, it is desirable to ensure high visibility regarding the state of the molten resin injected into the cavity in order to identify and improve the molding defect.

Therefore, the object of the injection molding die of the present invention is to ensure high visibility regarding the state of the molten resin injected into the cavity without causing a rise in manufacturing cost or a defect due to a mechanical impact. do.

First, the injection molding die according to the present invention is a fixed mold arranged in a fixed state, a movable mold movable with respect to the fixed mold, and a movable mold with respect to the movable mold. A window member provided with a take-out member and formed of a transparent thermoplastic resin material or a transparent thermosetting resin material is made removable from the movable mold, and is at least the fixed mold or the movable mold. On one side, an observation hole is formed so that the cavity can be visually recognized through the window member attached to the movable mold, and the window member is taken out from the movable mold by the take-out member when the fixed mold and the movable mold are separated. It is a thing.

As a result, the cavity can be visually recognized from the observation hole through the window member formed of the transparent resin material, and the window member taken out from the movable type by the take-out member at the time of releasing the fixed type and the movable type is newly provided. It is possible to replace it with a window member.

Secondly, in the injection molding die according to the present invention described above, it is desirable that the cavity is formed by the window member and at least one of the fixed mold and the movable mold.

As a result, the window member may be arranged only at a position where the cavity can be visually recognized.

Thirdly, in the injection molding die according to the present invention described above, it is desirable that a plurality of the window members are provided and the cavity is formed by the plurality of the window members.

As a result, since the cavity is formed by a plurality of window members formed of the resin material, it becomes easy to form a cavity having a desired shape.

Fourth, in the injection molding die according to the present invention described above, it is desirable that a movable pin is provided as the take-out member, and the window member is ejected from the movable die by the movable pin. ..

As a result, the window member is projected by the movable pin that can be moved with respect to the movable mold and is taken out from the movable mold.

Fifth, in the injection molding die according to the present invention described above, an ejector pin is provided to project a molded product formed by solidifying the molten resin filled in the cavity from the movable mold. It is desirable that the ejector pin and the movable pin are simultaneously moved with respect to the movable mold, and the molded product and the window member are simultaneously taken out from the movable mold.

As a result, the molded product 200 and the window member 21 are taken out of the movable mold by the ejector pin and the movable pin without any time lag.

Sixth, in the injection molding die according to the present invention described above, a drive plate that is movable with respect to the movable mold is provided, and the ejector pin and the movable pin are attached to the drive plate, and the ejector pin and the ejector pin are attached to the drive plate. It is desirable that the movable pin be moved at the same time as the drive plate is moved.

This eliminates the need for separate drive units for moving the ejector pin and the movable pin.

Seventh, in the above-mentioned injection molding die according to the present invention, it is desirable that the movable die is formed with a holding portion for holding the window member.

As a result, the window member is held in the movable type by the holding portion when the fixed type and the movable type are released, so that the window member is separated from the fixed type together with the movable type when the fixed type and the movable type are released.

Eighth, in the above-mentioned injection molding die according to the present invention, it is desirable that a plurality of the observation holes are formed so that the cavity can be visually recognized from different directions through the window member.

This makes it possible to visually recognize the state of the cavity from different directions through the window member from a plurality of observation holes.

Ninth, in the injection molding die according to the present invention described above, a reflective surface is formed on at least one of the fixed mold and the movable mold, and the cavity is formed through the window member from the observation hole through the reflective surface. Is desirable to be visible.

This makes it possible to visually recognize the state of the cavity from the observation hole through the window member by the light reflected by the reflecting surface.

Tenth, in the above-mentioned injection molding die according to the present invention, it is desirable that the total light transmittance of the window member is 70% or more.

As a result, the window member has high translucency.

Eleventh, in the above-mentioned injection molding die according to the present invention, it is desirable that the heat distortion temperature of the window member is 60 degrees or higher.

As a result, the window member has high heat resistance.

According to the present invention, it is possible to visually recognize the cavity from the observation hole through the window member formed of the transparent resin material, and the window member taken out from the movable type by the taking-out member at the time of releasing the fixed type and the movable type. Can be replaced with a new window member, ensuring high visibility regarding the condition of the molten resin injected into the cavity without causing problems due to soaring manufacturing costs or mechanical impact. be able to.

Along with FIGS. 2 to 7, the first embodiment of the present invention is shown, and this figure is a cross-sectional view of an injection molding die. It is a movable plan view which shows the window member as a cross section. It is sectional drawing which shows the example of the structure which increases the bonding force of a molded product with respect to a movable mold when a molten resin is solidified to form a molded product. It is a figure which shows the physical property of the thermoplastic resin material which forms a window member. It is sectional drawing of the injection molding die which shows the state which the molten resin is filled in the cavity. Continuing from FIG. 5, it is sectional drawing of the injection molding die which shows the state which the fixed die and the movable die are separated. Continuing from FIG. 6, it is sectional drawing of the injection molding die which shows the state which the window member and a molded object protrude from a movable mold. It is sectional drawing of the mold for injection molding which shows the 2nd Embodiment of this invention. FIG. 10 shows a third embodiment of the present invention, and this figure is a cross-sectional view of an injection molding die. It is sectional drawing of the injection molding die which shows the state which the metal die is used instead of a window member. FIG. 12 shows a fourth embodiment of the present invention, and this figure is a cross-sectional view of an injection molding die. It is sectional drawing of the injection molding die which shows the state which the metal die is used instead of a window member. It is sectional drawing of the injection molding die which shows the 5th Embodiment of this invention. It is sectional drawing of the injection molding die which shows the 6th Embodiment of this invention. It is sectional drawing of the injection molding die which shows the 7th Embodiment of this invention. It is sectional drawing of the mold for injection molding which shows the 8th Embodiment of this invention. It is a movable sectional view which shows another example in 8th Embodiment of this invention.

Hereinafter, embodiments for carrying out the injection molding die of the present invention will be described with reference to the accompanying drawings.

In the following description, the vertical direction is defined as the vertical direction in which the fixed mold and the movable mold of the injection molding mold are separated from each other, and the directions are shown up, down, front, back, left and right. The directions of up, down, front, back, left, and right shown below are shown for convenience of explanation, and the present invention is not limited to these directions. Further, the quantity, shape, arrangement, etc. of each component are not limited to the contents shown in the drawings without departing from the intent of the present invention.

<Mold for injection molding according to the first embodiment>
First, the injection molding die 1 according to the first embodiment will be described (see FIGS. 1 to 7). The injection molding die 1 has a function as a cold runner. However, the present invention can also be applied to an injection molding die having a function as a hot runner.

The injection molding die 1 has a fixed mold 2 and a movable mold 3 which are assembled to the injection molding machine as a part of the structure and are separated and contacted in the vertical direction (see FIGS. 1 and 2).

The fixed mold 2 has a flat plate-shaped fixed-side mounting plate 4 facing in the vertical direction and a fixed-side cavity plate 5 fixed to the lower surface of the fixed-side mounting plate 4.

The fixed-side cavity plate 5 is formed with a cavity recess 5a opened on one side at the lower side and on the side. The fixed-side cavity plate 5 is formed with an insertion hole 5b that is continuously vertically penetrated on one side of the cavity recess 5a. The fixed-side cavity plate 5 is formed with an observation recess 5c that is continuously opened downward and laterally on one side of the insertion hole 5b, and the observation recess 5c is opened on one side surface 2a of the fixed mold 2. Has been done. One side surface forming the insertion hole 5b is formed as an inclined surface 5d in the fixed-side cavity plate 5, and the inclined surface 5d is gently inclined so as to approach the side surface 2a as it goes downward.

An annular locating ring 6 is attached to the upper surface of the fixed side mounting plate 4 at the center, and the locating ring 6 has a function of positioning the injection molding machine when it is assembled to the injection molding machine.

A supply nozzle (not shown) that functions as a resin supply unit for supplying the molten resin is attached to the fixed mold 2. The supply nozzle is attached to the fixed mold 2 with the tip inserted into the locating ring 6.

A sprue 7 is provided at the center of the fixed mold 2. The sprue 7 is arranged in a state of being inserted in the central portion of the fixed mold 2, and is formed in a substantially cylindrical shape extending vertically. The upper opening of the sprue 7 communicates with the space inside the supply nozzle, and the lower opening coincides with the lower end of the fixed cavity plate 5.

Sleeves 8, 8, ... Penetrated vertically are arranged at the four corners inside the fixed-side cavity plate 5, respectively.

An internal space is formed in the movable type 3, and this internal space is used as an arrangement space 9. The movable mold 3 is moved in the vertical direction with respect to the fixed mold 2 and is separated from the fixed mold 2.

The movable type 3 includes a flat plate-shaped movable side mounting plate 10 facing in the vertical direction, a connecting plate 11 located above the movable side mounting plate 10, and a movable side cavity plate 12 fixed to the upper surface of the connecting plate 11. It has a connecting plate 13 that connects the outer peripheral portion of the movable side mounting plate 10 and the outer peripheral portion of the connecting plate 11. The movable side mounting plate 10, the connecting plate 13, and the connecting plate 11 form an arrangement space 9 inside the movable mold 3.

The movable side cavity plate 12 is formed with a cavity recess 12a opened on one side in the upper side and on the side side. The movable side cavity plate 12 is formed with an insertion hole 12b that is continuously vertically penetrated on one side of the cavity recess 12a, and the insertion hole 12b is directly below the insertion hole 5b formed in the fixed side cavity plate 5. Is located in. The movable side cavity plate 12 is formed with an observation recess 12c continuously opened upward and laterally on one side of the insertion hole 12b, and the observation recess 12c is opened on one side surface 3a of the movable mold 3. Has been done. The movable side cavity plate 12 is formed with a runner recess 12d that is continuously upwardly opened on the other side of the cavity recess 12a.

A first holding portion 14 is formed on the movable side cavity plate 12. The first holding portion 14 is formed as, for example, a concave portion (undercut portion) opened laterally and downward, and communicates with the lower end portion of the insertion hole 12b.

A second holding portion 15 is formed on the movable side cavity plate 12. The second holding portion 15 is formed as, for example, a recess opened laterally and upward, and communicates with the upper end portion of the insertion hole 12b and the cavity recess 12a.

A drive rod (not shown) that can move in the vertical direction is supported on the movable side mounting plate 10. The drive rod is driven by a drive source (not shown) composed of a cylinder, a piston, an electric motor, or the like.

Guided pins 16, 16, ... Are attached to the movable side cavity plate 12 at four corners, and a part of each of the guided pins 16, 16, ... Projects upward from the movable side cavity plate 12. Has been done. The guided pins 16, 16, ... Are inserted into the sleeves 8, 8, ... Provided to the fixed mold 2 when the movable mold 3 moves in a direction approaching the fixed mold 2. Therefore, the movable mold 3 is moved in an appropriate posture with respect to the fixed mold 2.

A drive plate 17 is movably supported in the arrangement space 9 of the movable type 3 in the vertical direction. The drive plate 17 is moved in the vertical direction by the drive force of the drive rod.

The lower ends of the return pins 18, 18, ... Are connected to the drive plate 17 (FIG. 1 shows only one return pin 18). The return pins 18, 18, ... Are connected to the corners of the drive plate 17, respectively, and are slidably supported by the movable side cavity plate 12 through the connecting plate 11. Therefore, in the drive plate 17, the return pins 18, 18, ... Are guided by the movable side cavity plate 12 and moved in the vertical direction.

The lower ends of the ejector pins 19, 19, ... That can be moved in the vertical direction are connected to the drive plate 17. The ejector pin 19 is slidably supported by the movable side cavity plate 12 through the connecting plate 11, and the upper surface forms the cavity recess 12a in the state where the drive plate 17 is located at the lower moving end. It corresponds to the bottom surface forming the runner recess 12d.

The lower ends of the movable pins 20, 20, ... That function as a take-out member and can move in the vertical direction are connected to the drive plate 17. The movable pin 20 is slidably supported by the connecting plate 11, and the upper surface coincides with the bottom surface forming the insertion hole 12b in a state where the drive plate 17 is located at the lower moving end.

A window member 21 formed of a resin material is inserted into the insertion hole 12b and arranged in the movable mold 3. The window member 21 is formed, for example, in a substantially rectangular plate shape (rectangular parallelepiped shape) whose thickness direction is orthogonal to the separation direction of the fixed mold 2 and the movable mold 3, and is formed of a transparent resin material. ing. The window member 21 is inserted with its lower end fitted in the insertion hole 12b. One side surface of the upper end portion of the window member 21 is formed as a slope 21a that is gently inclined so as to approach the other side surface as it goes upward.

In the above, when the drive plate 17 is located at the lower moving end, the upper surface (tip surface) of the ejector pin 19 is on the bottom surface forming the cavity recess 12a or the bottom surface forming the runner recess 12d. An example of matching is shown. For example, a bottom surface having a groove 19a formed at the upper end portion (tip portion) of the ejector pin 19 and a part of the upper surface forming a cavity recess 12a or a bottom surface forming a runner recess 12d. May match (see FIG. 3).

By forming the groove 19a at the upper end of the ejector pin 19, the molten resin is filled in the groove 19a with a high pressure when the molten resin is injected into the cavity described later, so that the molten resin is solidified and the molded product is formed. The bonding force of the molded product to the movable mold 3 becomes high when the mold 2 is formed, and the molded product can be reliably held by the movable mold 3 when the fixed mold 2 and the movable mold 3 are separated.

In the injection molding die 1, the window member 21 is formed of a resin material, and as will be described later, the window member 21 both formed of the resin material and the molded product are integrally movable in close contact with each other. Removed from mold 3. Therefore, as described above, the window member 21 is also released by forming the groove 19a at the upper end of the ejector pin 19 and reliably holding the molded product in the movable mold 3 when the fixed mold 2 and the movable mold 3 are released. Since the groove 19a is surely held by the movable mold 3 at the time of molding, the groove 19a also functions as a holding means for surely holding the window member 21 by the movable mold 3.

The window member 21 is formed of, for example, a thermoplastic resin material or a thermosetting resin material. As the thermoplastic resin material, for example, PMMA (acrylic), PS (polystyrene), AS (acrylonitrile / styrene copolymer), PC (polycarbonate), PVC (polyvinyl chloride) and the like are used. As the thermosetting resin material, for example, UF (Uria), MF (melamine), PAR (polyarylate), PSU (polysulfone) and the like are used.

FIG. 4 shows the physical characteristics of the thermoplastic resin material (PMMA, PS, AS, PC, PVC). The window member 21 is preferably formed of a material having high heat resistance, and the heat distortion temperature is preferably 60 degrees or higher, preferably 90 degrees or higher, and more preferably 120 degrees or higher. Further, the window member 21 is preferably formed of a material having high mechanical strength, and the tensile strength per square centimeter is preferably 370 kgf or more, preferably 600 kgf or more. Further, the window member 21 is preferably formed of a material having high transparency, and the total light transmittance is preferably 70% or more, preferably 90% or more.

As shown in FIG. 4, in PMMA, PS, PC, AS, and PVC, the heat distortion temperature is 60 degrees or more, which is a desirable value, the tensile strength per square centimeter is 370 kgf or more, and the total light transmittance is 70. It is a material satisfying a value of% or more, and is particularly useful as a window member 21.

In the injection molding die 1 configured as described above, when the movable die 3 is moved upward with respect to the fixed die 2 and the fixed die 2 and the movable die 3 are abutted against each other, the insertion hole 5b of the fixed die 2 is formed. The member placement space 22 is formed by the insertion hole 12b of the movable mold 3 and the space between the two, and the observation hole 23 is formed by the observation recess 5c of the fixed mold 2 and the observation recess 12c of the movable mold 3. See Figure 1). Further, in a state where the fixed mold 2 and the movable mold 3 are butted vertically, the runner recess 12d of the movable mold 3 is formed as a runner 24 which is a flow path of the molten resin, and the space inside the sprue 7 is provided in the runner 24. Communicate. The opening on the cavity 12a side of the runner 24 is a gate 24a.

When the movable mold 3 is moved upward with respect to the fixed mold 2 and the fixed mold 2 and the movable mold 3 are butted against each other, the upper end portion of the window member 21 is inserted into the insertion hole 5b of the fixed mold 2, and the window member 21 is a member. It is arranged in the arrangement space 22. By arranging the window member 21 in the member arrangement space 22, the cavity 25 is formed by the cavity recess 5a of the fixed mold 2, the cavity recess 12a of the movable mold 3, and the window member 21.

When the fixed mold 2 and the movable mold 3 are butted against each other to form the cavity 25, the molten resin 100 is supplied to the sprue 7 from the supply nozzle (see FIG. 5). The molten resin 100 flows through the runner 24 from the sprue 7 and is ejected from the gate 24a into the cavity 25, and the cavity 25 is filled with the molten resin 100. When the cavity 25 is filled with the molten resin 100, the supply of the molten resin 100 from the supply nozzle to the cavity 25 is stopped.

When the molten resin 100 is injected into the cavity 25, the operator can visually recognize the state of the cavity 25 from the observation hole 23 through the window member 21 from the direction of arrow A, and observe the injection state of the molten resin 100 into the cavity 25. be able to. By observing the injection state of the molten resin 100 into the cavity 25, it is possible to grasp and improve the molding defect and improve the yield of the molded product used as a product.

Further, when the molten resin 100 is injected into the cavity 25, the temperatures of the fixed mold 2 and the movable mold 3 rise, heat is transferred from the fixed mold 2 and the movable mold 3 to the window member 21, and the high temperature molten resin 100 is used. Heat is transferred to the window member 21. Therefore, the window member 21 is expanded according to the heat transferred, and the expanded portion 21b of the window member 21 is formed in the first holding portion 14. Further, a part of the molten resin 100 injected into the cavity 25 is filled in the second holding portion 15. A part of the molten resin 100 filled in the second holding portion 15 is a holding filling portion 100a, and the holding filling portion 100a is held at a high pressure with a high pressure as the molten resin 100 is injected into the cavity 25. The portion 15 is filled.

When the supply of the molten resin 100 to the cavity 25 is stopped, after a certain period of time, the molten resin 100 filled in the cavity 25 is cooled and solidified to form a molded product 200. At this time, the molten resin 100 filled in the runner 24 is also solidified, and the molten resin 100 filled and solidified in the runner 24 is referred to as a runner molding portion 200a. When the molten resin 100 is cooled, the holding filling portion 100a filled in the second holding portion 15 is solidified in a state of being in close contact with the window member 21.

When the molten resin 100 filled in the cavity 25 is cooled and solidified, the movable mold 3 is moved downward and separated from the fixed mold 2 together with the molded product 200, and the fixed mold 2 and the movable mold 3 are released (the fixed mold 2 and the movable mold 3 are released). See FIG. 6).

When the movable mold 3 is moved downward, the expansion portion 21b of the window member 21 is formed in the first holding portion 14, and the holding filling portion 100a filled in the second holding portion 15 is formed in the window member 21. Since the window member 21 is solidified in a close contact state and the coupling force of the window member 21 to the movable side cavity plate 12 is high, the window member 21 is integrally moved to the movable mold 3 and the molded product 200 downward.

Therefore, the first holding portion 14 and the second holding portion 15 are movable so that the window member 21 has a higher coupling force with the movable mold 3 than the fixed mold 2 when the fixed mold 2 and the movable mold 3 are released. It functions as a holding means for securely holding the window member 21 in the mold 3.

As described above, the movable mold 3 is moved downward, but at this time, since the inclined surface 5d is formed on the fixed mold 2 and the inclined surface 21a is formed on the window member 21, the upper end portion of the window member 21 is fixed. The window member 21 is smoothly pulled out from the insertion hole 5b of the mold 2 and is easily coupled to the movable mold 3, and the window member 21 is moved downward together with the movable mold 3.

Therefore, the slope 21a of the window member 21 is also provided with the window member 21 on the movable mold 3 so that the window member 21 has a higher coupling force with the movable mold 3 than the fixed mold 2 when the fixed mold 2 and the movable mold 3 are released. It functions as a holding means to hold it securely.

When the fixed mold 2 and the movable mold 3 are released, the drive plate 17 is moved upward by the driving force of the drive rod, and as the drive plate 17 moves, the ejector pins 19, 19, ... And the movable pin 20 , 20, ... Are moved upward at the same time (see FIG. 7). When the ejector pins 19, 19, ... And the movable pins 20, 20, ... Are moved upward, the molded product 200 and the window member 21 are moved to the ejector pins 19, 19, ... And the movable pins 20, ... It is ejected by 20, ... And is taken out from the insertion hole 12b.

The window member 21 may be worn or deformed due to heat transmitted from the fixed mold 2 and the movable mold 3, heat transmitted from the molten resin 100, pressure during flow of the molten resin 100, flow resistance, and the like. Therefore, when the window member 21 is taken out from the insertion hole 12b, a new window member 21 is inserted into the insertion hole 12b and the window member 21 is replaced. The window member 21 is replaced with a new window member 21 for each shot of the molten resin 100 on which one molded product 200 is formed.

In the above, an example in which the movable pin 20 is provided as a take-out member for taking out the window member 21 from the movable mold 3, but the take-out member is not limited to the movable pin 20, and as a take-out member, for example, A stripper plate may be provided.

Further, in the above, when the fixed mold 2 and the movable mold 3 are separated from each other, the window member 21 has a higher coupling force with the movable mold 3 than the fixed mold 2, and the movable mold 3 securely holds the window member 21. As the holding means, the first holding portion 14, the second holding portion 15, and the slope 21a are shown as an example. For example, the window is formed from the clearance between the outer peripheral surface of the window member 21 and the insertion hole 5b of the fixed mold 2. The clearance between the outer peripheral surface of the member 21 and the insertion hole 12b of the movable mold 3 may be reduced so that the window member 21 has a higher coupling force with the movable mold 3 than the fixed mold 2.

By making the clearances different in this way, the window member 21 that expands due to the heat generated during molding of the molded product 200 is in a state of having a higher bonding force to the movable mold 3 than the fixed mold 2, and the window member 21 is released at the time of mold release. It becomes possible to move it downward together with the movable type 3. Therefore, it is also possible to make the clearances as described above different, so that the window member 21 has a higher coupling force with the movable type 3 than the fixed type 2 when the fixed type 2 and the movable type 3 are released, and the window is attached to the movable type 3. It is a holding means for reliably holding the member 21.

In the injection molding die 1, by observing the injection state of the molten resin 100 from the observation hole 23 through the window member 21 into the cavity 25, the molded state of the molded product 200 is evaluated and the molten resin injected into the cavity 25 is evaluated. It is possible to evaluate 100, and it is possible to set conditions such as the flow velocity and temperature of the molten resin 100 injected into the cavity 25 according to these evaluation results.

On the other hand, when setting molding conditions or the like as a preparatory step for forming the molded product 200, a metal mold (not shown) formed in the same shape and size as the window member 21 is used instead of the window member 21. May be good. The metal mold can be used repeatedly during continuous molding in which the molten resin 100 is injected a plurality of times, and is used not only for setting molding conditions such as the injection pressure and flow velocity of the molten resin 100, but also for injection molding. It can also be used when the temperature of the mold 1 is raised or when the molten resin 100 staying in each part is discharged or replaced.

As described above, in the injection molding die 1, since the cavity 25 is formed by the window member 21, the fixed mold 2, and the movable mold 3, the window member 21 is located only at a position where the cavity 25 can be visually recognized. The structure of the injection molding die 1 and the shape of the window member 21 can be simplified, and the injection state of the molten resin 100 into the cavity 25 can be observed without increasing the manufacturing cost.

In the above, an example in which the cavity 25 is formed by the window member 21, the fixed mold 2, and the movable mold 3 is shown, but the cavity 25 is formed by the window member 21 and one of the fixed mold 2 or the movable mold 3. You may be. In this case as well, the window member 21 only needs to be placed at a position where the cavity 25 can be visually recognized, and the structure of the injection molding die 1 and the shape of the window member 21 are simplified without causing an increase in manufacturing cost. The injection state of the molten resin 100 into the cavity 25 can be observed.

Further, in the injection molding die 1, the window member 21 such as the first holding portion 14 and the second holding portion 15 for holding the window member 21 in the movable mold 3 is a movable mold 3 rather than the fixed mold 2. A holding means for holding the window member 21 on the movable die 3 is formed so as to have a high coupling force.

Therefore, when the fixed mold 2 and the movable mold 3 are released, the window member 21 is held by the movable mold 3 by the first holding portion 14, the second holding portion 15, and the like, so that the fixed mold 2 and the movable mold 3 are separated from each other. At the time of molding, the window member 21 is surely separated from the fixed mold 2 together with the movable mold 3, and after the fixed mold 2 and the movable mold 3 are released, the window member 21 is surely taken out from the movable mold 3 and easily replaced with a new window member 21. Can be exchanged.

Further, since the window member 21 is inserted into both the insertion hole 5b of the fixed mold 2 and the insertion hole 12b of the movable mold 3 in a state where the fixed mold 2 and the movable mold 3 are butted against each other, the window member 21 has high strength and stability. The molten resin 100 can be filled in the cavity 25 after ensuring the holding state.

Furthermore, since the total light transmittance of the window member 21 is set to 70% or more, the window member 21 has high translucency, so that high visibility to the cavity 25 via the window member 21 is ensured. Can be done.

In addition, since the heat distortion temperature of the window member 21 is set to 60 degrees or higher, the window member 21 has high heat resistance, so that the window member 21 is less likely to be deformed or melted when the molten resin 100 is injected, and the window member 21 is not easily deformed or melted. Higher visibility into the cavity 25 via 21 can be ensured.

The holding means for ensuring that the window member 21 holds the window member 21 in the movable mold 3 in a state where the window member 21 has a higher coupling force with the movable mold 3 than in the fixed mold 2 is the groove 19a of the ejector pin 19 described above. It is sufficient that at least one of the holding portion 14, the second holding portion 15, the slope 21a, or the means due to the difference in clearance is formed.

Further, these holding means may be appropriately formed in each of the following embodiments, and in each of the following embodiments, the description and illustration of each of these holding means will be omitted.

<Mold for injection molding according to the second embodiment>
Next, the injection molding die 1A according to the second embodiment will be described (see FIG. 8).

The injection molding die 1A shown below differs from the injection molding die 1 described above only in that the observation holes are formed only in the movable mold. Therefore, in the following description of the injection molding die 1A, only the parts different from the injection molding die 1 will be described in detail, and the other parts will be the same parts in the injection molding die 1. The same reference numerals as those attached to are added and the description thereof will be omitted.

The injection molding die 1A has a fixed die 2A and a movable die 3.

The fixed mold 2A has a fixed side mounting plate 4 and a fixed side cavity plate 5A. Neither the cavity recess 5a, the insertion hole 5b, nor the observation recess 5c is formed in the fixed-side cavity plate 5A.

The window member 21A is inserted into the insertion hole 12b and arranged in the movable mold 3. The window member 21A is formed, for example, in a substantially rectangular plate shape (rectangular parallelepiped shape) whose thickness direction is orthogonal to the separation direction of the fixed type 2A and the movable type 3, and is formed of a transparent resin material. ing. The window member 21A is inserted with a substantially lower half portion fitted in the insertion hole 12b.

In the injection molding die 1A configured as described above, when the movable die 3 is moved upward with respect to the fixed die 2A and the fixed die 2A and the movable die 3 are abutted against each other, the insertion hole 12b of the movable die 3 is formed. The member placement space 22A is formed by the space directly above the insertion hole 12b, and the observation recess 12c of the movable mold 3 is formed as the observation hole 23A.

When the movable mold 3 is moved upward with respect to the fixed mold 2A and the fixed mold 2A and the movable mold 3 are abutted against each other, the upper surface of the window member 21A is brought into close contact with the lower surface of the fixed side cavity plate 5A. By arranging the window member 21A in the member arrangement space 22A, the cavity 25A is formed by the lower surface of the fixed side cavity plate 5A in the fixed mold 2A, the cavity recess 12a of the movable mold 3, and the window member 21A.

When the molten resin 100 is injected into the cavity 25A, the operator can visually recognize the state of the cavity 25A from the observation hole 23A through the window member 21A from the direction of the arrow A, and observe the injection state of the molten resin 100 into the cavity 25A. be able to.

In the injection molding die 1A, by observing the injection state of the molten resin 100 from the observation hole 23A through the window member 21A into the cavity 25A, the molding state of the molded product 200 can be evaluated and the molten resin injected into the cavity 25A can be evaluated. The evaluation of 100 can be performed, and conditions such as the flow velocity and the temperature of the molten resin 100 injected into the cavity 25A can be set according to these evaluation results.

Further, in the injection molding die 1A, since the observation hole 23A is formed only in the movable die 3, the window member 21A can be downsized. Further, since the window member 21A does not have a portion to be inserted into the fixed mold 2A, the window member 21A is not coupled to the fixed mold 2A at the time of mold release, and the window member 21A is reliably moved to the movable mold 3 at the time of mold release. Can be moved with.

On the other hand, when setting molding conditions or the like as a preparatory step for forming the molded product 200, a metal mold (not shown) formed in the same shape and size as the window member 21A is used instead of the window member 21A. May be good. The metal mold can be used repeatedly during continuous molding in which the molten resin 100 is injected a plurality of times, and is used not only for setting molding conditions such as the injection pressure and flow velocity of the molten resin 100, but also for injection molding. It can also be used when the temperature of the mold 1A is raised or when the molten resin 100 staying in each part is discharged or replaced.

<Mold for injection molding according to the third embodiment>
Next, the injection molding die 1B according to the third embodiment will be described (see FIGS. 9 and 10).

The injection molding die 1B shown below is different from the injection molding die 1 described above only in that the window member is formed with a recess forming a part of the cavity. Therefore, in the following description of the injection molding die 1B, only the parts different from the injection molding die 1 will be described in detail, and the other parts will be the same parts in the injection molding die 1. The same reference numerals as those attached to are added and the description thereof will be omitted.

The injection molding die 1B has a fixed die 2B and a movable die 3B (see FIG. 9).

The fixed mold 2B has a fixed side mounting plate 4 and a fixed side cavity plate 5B.

The fixed-side cavity plate 5B is formed with a cavity recess 5e opened on one side at the lower side and on the side.

The movable type 3B has a movable side mounting plate 10, a connecting plate 11, a movable side cavity plate 12B, and a connecting plate 13.

The movable side cavity plate 12B is provided with a convex portion 12e for a cavity protruding upward. The runner recess 12d is not formed on the movable side cavity plate 12B.

The upper surface of the ejector pin 19 coincides with the upper surface of the cavity protrusion 12e in a state where the drive plate 17 is located at the lower moving end.

In the movable type 3B, the window member 21B is inserted into the insertion hole 12b and arranged. The window member 21B is formed, for example, in a substantially rectangular plate shape (rectangular parallelepiped shape) whose thickness direction is orthogonal to the separation and contact directions of the fixed type 2B and the movable type 3B, and is formed of a transparent resin material. ing. The window member 21B is formed with a cavity 21c for a cavity that is opened laterally.

In the injection molding die 1B configured as described above, when the movable die 3B is moved upward with respect to the fixed die 2B and the fixed die 2B and the movable die 3B are abutted against each other, the upper end portion of the window member 21B is fixed. It is inserted into the insertion hole 5b of the mold 2B, and the window member 21B is arranged in the member arrangement space 22. By arranging the window member 21B in the member arrangement space 22, the cavity 25B is formed by the cavity recess 5e of the fixed type 2B, the cavity protrusion 12e of the movable type 3B, and the cavity recess 21c of the window member 21B. ..

Further, in a state where the fixed type 2B and the movable type 3B are abutted at the top and bottom, the space inside the sprue 7 is communicated with the central portion of the cavity 25B.

At the time of injecting the molten resin 100 into the cavity 25B, the operator can visually recognize the state of the cavity 25B from the observation hole 23 through the window member 21B from the direction of arrow A, and observe the injection state of the molten resin 100 into the cavity 25B. be able to.

The molded product 200 is projected from the movable mold 3B together with the window member 21B.

As described above, in the injection molding die 1B, the cavity portion 21c constituting the cavity 25B is formed in the window member 21B, and since the window member 21B is made of resin, it is easy to form the cavity recess 21c. It is possible to do it. Therefore, by forming the cavity portion 21c into a desired shape, the cavity 25B can be easily formed according to the shape of the required molded product 200, and the degree of freedom in design can be improved. ..

Further, in the injection molding die 1B, by observing the injection state of the molten resin 100 from the observation hole 23 through the window member 21B into the cavity 25B, the molding state of the molded product 200 is evaluated and the injection is injected into the cavity 25B. The molten resin 100 can be evaluated, and conditions such as the flow velocity and the temperature of the molten resin 100 injected into the cavity 25B can be set according to these evaluation results.

Further, by using the window member 21B, it is possible to evaluate the molding state of the molded product 200 and the molten resin 100 injected into the cavity 25B, and the shape of the cavity recess 21c can be changed according to these evaluation results. It can be changed arbitrarily.

Furthermore, since the window member 21B is inserted into both the insertion hole 5b of the fixed type 2B and the insertion hole 12b of the movable type 3B in a state where the fixed type 2B and the movable type 3B are abutted against each other, the high strength of the window member 21B and the high strength of the window member 21B. The molten resin 100 can be filled in the cavity 25B after ensuring a stable holding state.

On the other hand, when setting molding conditions or the like as a preparatory step for forming the molded product 200, a rectangular parallelepiped metal mold 26 may be used instead of the window member 21B (see FIG. 10). The metal mold 26 can be repeatedly used during continuous molding in which the molten resin 100 is injected a plurality of times, and is used not only for setting molding conditions such as the injection pressure and flow velocity of the molten resin 100, but also for injection molding. It can also be used when the temperature of the mold 1B is raised or when the molten resin 100 staying in each part is discharged or replaced.

<Mold for injection molding according to the fourth embodiment>
Next, the injection molding die 1C according to the fourth embodiment will be described (see FIGS. 11 and 12).

The injection molding die 1C shown below differs from the injection molding die 1 described above only in that a cavity is formed by two window members. Therefore, in the following description of the injection molding die 1C, only the parts different from the injection molding die 1 will be described in detail, and the other parts will be the same parts in the injection molding die 1. The same reference numerals as those attached to are added and the description thereof will be omitted.

The injection molding die 1C has a fixed die 2C and a movable die 3C (see FIG. 11).

The fixed mold 2C has a fixed side mounting plate 4 and a fixed side cavity plate 5C.

The cavity plate 5C on the fixed side is not formed with the cavity 5a.

The movable type 3C has a movable side mounting plate 10, a connecting plate 11, a movable side cavity plate 12C, and a connecting plate 13.

The movable side cavity plate 12C is not formed with the cavity recess 12a and the runner recess 12d.

A window member 21L and a window member 21M formed of a transparent resin material are arranged in the injection molding die 1C, respectively. The window member 21L is formed with a cavity portion 21d opened downward and an inflow hole 21e penetrated vertically. The upper end of the inflow hole 21e is opened on the upper surface of the window member 21L, and the lower end is opened in the cavity recess 21d. The window member 21M is provided with a convex portion 21f for a cavity protruding upward. The window member 21M is formed with pin insertion holes 21g, 21g, ... Penetrated vertically, and the upper ends of the pin insertion holes 21g, 21g, ... It is opened on the lower surface of the member 21M.

The window member 21L and the window member 21M are vertically connected by, for example, coupling pins 27, 27, .... By connecting the window member 21L and the window member 21M, the cavity 25C is formed inside by the cavity recess 21d and the cavity protrusion 21f. The window member 21M is inserted into the insertion hole 12b of the movable type 3C and arranged in a state of being coupled to the window member 21L. In the state where the window member 21M is inserted into the insertion hole 12b, the ejector pins 19, 19, ... Are inserted into the pin insertion holes 21g, 21g, ..., Respectively. The upper surface of the ejector pin 19 coincides with the upper surface of the cavity protrusion 21f in a state where the drive plate 17 is located at the lower moving end.

In the injection molding die 1C configured as described above, when the movable die 3C is moved upward with respect to the fixed die 2C and the fixed die 2C and the movable die 3C are abutted against each other, the window member 21L becomes the fixed die 2C. It is inserted into the insertion hole 5b, and the window member 21L and the window member 21M are arranged in the member arrangement space 22. In the state where the window member 21L is inserted into the insertion hole 5b, the space inside the sprue 7 is communicated with the inflow hole 21e of the window member 21L.

When the fixed type 2C and the movable type 3C are butted against each other, the molten resin 100 is supplied to the sprue 7 from the supply nozzle. The molten resin 100 is injected from the sprue 7 into the cavity 25C through the inflow hole 21e of the window member 21L, and the cavity 25C is filled with the molten resin 100.

At the time of injecting the molten resin 100 into the cavity 25C, the operator can visually recognize the state of the cavity 25C from the observation hole 23 through the window member 21L from the direction of arrow A, and observe the injection state of the molten resin 100 into the cavity 25C. be able to.

When the molten resin 100 filled in the cavity 25C is cooled and solidified, the movable mold 3C is moved downward, and the window member 21L and the window member 21M are separated from the fixed mold 2C together with the molded product 200 and are movable with the fixed mold 2C. Mold 3C is released.

When the fixed type 2C and the movable type 3C are released, the drive plate 17 is moved upward, and as the drive plate 17 moves, the ejector pins 19, 19, ... And the movable pins 20, 20, ... Is moved upward at the same time. When the ejector pins 19, 19, ... And the movable pins 20, 20, ... Are moved upward, the window member 21L is projected together with the molded product 200 in a state of being coupled to the window member 21M, and the insertion hole is inserted. Taken from 12b.

In the injection molding die 1C, by observing the injection state of the molten resin 100 from the observation hole 23 through the window member 21L into the cavity 25C, the molding state of the molded product 200 can be evaluated and the molten resin injected into the cavity 25C. It is possible to evaluate 100, and it is possible to set conditions such as the flow velocity and temperature of the molten resin 100 injected into the cavity 25C according to these evaluation results.

Further, in the injection molding die 1C, the cavity 25C is formed by the window member 21L and the window member 21M, and since the window member 21L and the window member 21M are made of resin, the cavity 25C can be easily formed. Is possible. Therefore, by forming the cavity 25C into a desired shape, the cavity 25C can be easily formed according to the shape of the required molded product 200, and the degree of freedom in design can be improved.

Further, by using the window member 21L and the window member 21M, the molding state of the molded product 200 can be evaluated, and the shape of the cavity 25C can be arbitrarily changed according to the evaluation result.

Furthermore, since the window member 21L is inserted into the insertion hole 5b of the fixed mold 2 and the window member 21M is inserted into the insertion hole 12b of the movable mold 3 in a state where the fixed mold 2C and the movable mold 3C are butted against each other, the window member 21L is inserted. The cavity 25C can be filled with the molten resin 100 while ensuring high strength and a stable holding state of the window member 21M.

On the other hand, when the molding conditions are set as a preparatory step for forming the molded product 200, the metal molds 28 and 29 may be used instead of the window member 21L and the window member 21M (see FIG. 12). The metal dies 28 and 29 can be repeatedly used during continuous molding in which the molten resin 100 is injected a plurality of times, and can be used not only for setting molding conditions such as the injection pressure and flow velocity of the molten resin 100, but also for injection. It can also be used when the temperature of the molding die 1C is raised or when the molten resin 100 staying in each part is discharged or replaced.

Bolt holes for fastening are formed in the fixed type 2C and the movable type 3C, respectively. In the metal type 28, for example, fixing members such as bolts 30, 30, ... Are screwed into the bolt holes. It is fixed to the fixed mold 2C, and the metal mold 29 is fixed to the movable mold 3C by, for example, a fixing member such as bolts 30, 30, ... Is screwed into the bolt hole.

The metal mold 28 has substantially the same configuration as the window member 21L. The metal mold 28 is formed with a cavity recess 28a opened downward and an inflow hole 28b penetrating vertically.

The metal mold 29 has substantially the same configuration as the window member 21M. The metal mold 29 is provided with a convex portion 29a for a cavity that protrudes upward. Pin insertion holes 29b, 29b, ... Penetrated vertically are formed in the metal mold 29, and ejector pins 19, 19, ... Are inserted into the pin insertion holes 29b, 29b, ..., Respectively. .. The upper surface of the ejector pin 19 coincides with the upper surface of the cavity convex portion 29a in a state where the drive plate 17 is located at the lower moving end.

The metal mold 29 is formed with outer insertion holes 29c, 29c, ... Penetrated vertically at positions around the pin insertion holes 29b, 29b, ..., And the outer insertion holes 29c, 29c, ... Not communicated with the cavity 25C. Movable pins 20, 20, ... Are located directly below the outer insertion holes 29c, 29c, ..., respectively, and the drive plate 17 is located at the lower moving end of the movable pins 20, 20, .... The upper surface coincides with the upper surface of the connecting plate 11 in the present state.

When the metal molds 28 and 29 are used, when the molten resin 100 filled in the cavity 25C is cooled and solidified, the movable mold 3C is moved downward and the fixed mold 2C is moved together with the metal mold 29 and the molded product 200. The fixed type 2C and the movable type 3C are separated from the mold.

When the fixed type 2C and the movable type 3C are released, the ejector pins 19, 19, ... And the movable pins 20, 20, ... Are simultaneously moved upward as the drive plate 17 moves. By moving the ejector pins 19, 19, ..., The molded product 200 is projected and taken out from the metal mold 29. At this time, the movable pins 20, 20, ... Are inserted into the outer insertion holes 29c, 29c, ... Of the metal mold 29.

Although the example in which the cavity 25C is formed by the two window members of the window member 21L and the window member 21M is shown above, the cavity may be formed by three or more window members.

<Mold for injection molding according to the fifth embodiment>
Next, the injection molding die 1D according to the fifth embodiment will be described (see FIG. 13).

The injection molding die 1D shown below has a different orientation in which the window member is arranged as compared with the injection molding die 1 described above, and the cavity can be visually recognized from the observation hole through the reflective surface. And the only difference is that the observation holes are formed only in the fixed mold. Therefore, in the following description of the injection molding die 1D, only the parts different from the injection molding die 1 will be described in detail, and the other parts will be the same parts in the injection molding die 1. The same reference numerals as those attached to are added and the description thereof will be omitted.

The injection molding die 1D has a fixed die 2D and a movable die 3D.

The fixed type 2D has a fixed side mounting plate 4 and a fixed side cavity plate 5D.

The cavity plate 5D on the fixed side is not formed with a cavity 5a for a cavity and a recess 5c for observation. The fixed-side cavity plate 5D is formed with a runner recess 5f that is continuously opened downward on the other side of the insertion hole 5b.

An observation hole 23D is formed in the fixed side cavity plate 5D. The observation hole 23D is bent in an orthogonal direction and has a first space 23a extending left and right and a second space 23b extending vertically. In the fixed side cavity plate 5D, a reflecting surface 23c is formed in a continuous portion of the first space 23a and the second space 23b. One end of the first space 23a is opened to the side surface 2a, and one end of the second space 23b is communicated with the insertion hole 5b.

The reflective surface 23c is inclined in the left-right direction and the vertical direction, and is formed by, for example, a reflective component such as acrylic being sprayed onto a predetermined surface of the fixed-side cavity plate 5D by a spray or the like, or a stainless steel plate is formed in the fixed-side cavity. It is formed by being attached to a predetermined surface of the plate 5D or by applying a silver solution to a predetermined surface of the fixed-side cavity plate 5D.

The movable type 3D has a movable side mounting plate 10, a movable side cavity plate 12D, and a connecting plate 13, and the movable type 3D is not provided with a connecting plate 11. In the movable type 3D, an arrangement space 9 is formed inside by a movable side mounting plate 10, a movable side cavity plate 12D, and a connecting plate 13.

The movable side cavity plate 12D is not formed with any of the cavity recess 12a, the insertion hole 12b, the observation recess 12c, and the runner recess 12d.

The ejector pin 19 and the movable pin 20 are slidably supported by the movable side cavity plate 12D, and the upper surface thereof coincides with the upper surface of the movable side cavity plate 12D in a state where the drive plate 17 is located at the lower moving end. ..

In the fixed type 2D, the window member 21D is inserted into the insertion hole 5b and arranged. The window member 21D is formed, for example, in a substantially rectangular plate shape (rectangular parallelepiped shape) whose thickness direction coincides with the separation and contact directions of the fixed type 2D and the movable type 3D, and is formed of a transparent resin material. .. The window member 21D is formed with a cavity portion 21h opened downward.

In the injection molding die 1D configured as described above, when the fixed die 2D and the movable die 3D are butted against each other, the runner recess 5f of the fixed die 2D is formed as a runner 24D which is a flow path of the molten resin. The space inside the sprue 7 is communicated with the runner 24D. Further, by abutting the movable type 2D and the fixed type 3D, the lower surface of the window member 21D is brought into close contact with the upper surface of the movable side cavity plate 12D, and the cavity recess 21h of the window member 21D is formed as the cavity 25D. The cavity 25D communicates with the runner 24D.

When the molten resin 100 is injected into the cavity 25D, the operator can visually recognize the state of the cavity 25D from the observation hole 23D through the window member 21D through the window member 21D in the thickness direction of the window member 21D from the arrow A direction. The injection state of the molten resin 100 into 25D can be observed.

As described above, in the injection molding die 1D, the state of the cavity 25D can be visually recognized in the thickness direction of the window member 21D through the window member 21D, so that the visible area becomes large and the molten resin 100 into the cavity 25D is 100. It is possible to secure high visibility regarding the injection state of.

When the supply of the molten resin 100 to the cavity 25D is stopped, after a certain period of time, the molten resin 100 filled in the cavity 25D is cooled and solidified to form a molded product 200.

When the molten resin 100 filled in the cavity 25D is cooled and solidified, the movable type 3D is moved downward and separated from the fixed type 2D together with the window member 21D and the molded product 200, and the fixed type 2D and the movable type 3D are separated. Be typed.

When the fixed type 2D and the movable type 3D are released, the drive plate 17 is moved upward by the driving force of the drive rod, and as the drive plate 17 moves, the ejector pins 19, 19, ... And the movable pin 20 , 20, ... Are moved upward at the same time. When the ejector pins 19, 19, ... And the movable pins 20, 20, ... Are moved upward, the molded product 200 and the window member 21D are projected and taken out from the movable 3D.

When the molded product 200 and the window member 21D are taken out from the movable 3D, a new window member 21D is inserted into the insertion hole 5b and the window member 21D is replaced. Therefore, the window member 21D is replaced with a new window member 21D for each shot of the molten resin 100 on which one molded product 200 is formed.

In the injection molding die 1D, by observing the injection state of the molten resin 100 from the observation hole 23D through the window member 21D into the cavity 25D, the molding state of the molded product 200 can be evaluated and the molten resin injected into the cavity 25D can be evaluated. It is possible to evaluate 100, and it is possible to set conditions such as the flow velocity and temperature of the molten resin 100 injected into the cavity 25D according to these evaluation results.

Further, the injection molding die 1D is configured so that the state of the cavity 25D can be visually recognized from the observation hole 23D through the window member 21D via the reflection surface 23c, so that the position of the reflection surface 23c can be visually recognized. Optimal visibility can be ensured by the operator by changing the orientation and size.

Further, in the injection molding die 1D, the thickness direction of the window member 21D is set to match the separation and contact directions of the fixed mold 2D and the movable mold 3D, so that the orientation of the window member 21D is movable with the fixed mold 2D. It is optimized for the separation and contact direction of the mold 3D, and can be optimized in the molding operation when forming a molded product used as a product.

On the other hand, when the molding conditions are set as a preparatory step for forming the molded product 200, the molded product 200 is formed in the same shape and size as the window member 21D instead of the window member 21D, and is fixed to the fixed mold 2D by bolts or the like. A metal mold (not shown) may be used. The metal mold can be used repeatedly during continuous molding in which the molten resin 100 is injected a plurality of times, and is used not only for setting molding conditions such as the injection pressure and flow velocity of the molten resin 100, but also for injection molding. It can also be used when the temperature of the mold 1D is raised or when the molten resin 100 staying in each part is discharged or replaced.

Although the injection molding die 1D is formed with bolt holes for fastening bolts to which bolts are screwed, the description and illustration of the bolt holes are omitted, and the following sixth embodiment to eighth are omitted. Similarly, in the embodiment of the above, the description and illustration of the bolt holes will be omitted.

Further, in the above-mentioned injection molding die 1D, an example is shown in which the cavity portion 21h of the window member 21D is formed as the cavity 25D. For example, the movable mold 3D has a cavity recess and the window member 21D. The cavity 25D may be formed by the cavity recess 21h and the movable 3D cavity recess. Further, the cavity recess may be formed in the movable 3D instead of the cavity recess 21h, and the cavity recess of the movable 3D may be formed as the cavity 25D.

<Mold for injection molding according to the sixth embodiment>
Next, the injection molding die 1E according to the sixth embodiment will be described (see FIG. 14).

The injection molding die 1E shown below has a different orientation in which the window member is arranged as compared with the injection molding die 1 described above, and the cavity can be visually recognized from the observation hole through the reflective surface. And the only difference is that the observation holes are formed only in the movable type. Therefore, in the following description of the injection molding die 1E, only the parts different from the injection molding die 1 will be described in detail, and the other parts will be the same parts in the injection molding die 1. The same reference numerals as those attached to are added and the description thereof will be omitted.

The injection molding die 1E has a fixed die 2E and a movable die 3E.

The fixed mold 2E has a fixed side mounting plate 4 and a fixed side cavity plate 5E.

Neither the cavity recess 5a, the insertion hole 5b, nor the observation recess 5c is formed in the fixed-side cavity plate 5E.

The movable type 3E has a movable side mounting plate 10, a movable side cavity plate 12E, and a connecting plate 13, and the movable type 3E is not provided with the connecting plate 11. In the movable type 3E, an arrangement space 9 is formed inside by a movable side mounting plate 10, a movable side cavity plate 12E, and a connecting plate 13.

The movable side cavity plate 12E is formed with a runner recess 12d that is continuously upwardly opened on the other side of the insertion hole 12b. The movable side cavity plate 12E is not formed with the cavity recess 12a and the observation recess 12c.

An observation hole 23E is formed in the movable side cavity plate 12E. The observation hole 23E is bent in an orthogonal direction and has a first space 23d extending left and right and a second space 23e extending vertically. In the movable side cavity plate 12E, a reflecting surface 23f is formed in a continuous portion of the first space 23d and the second space 23e. One end of the first space 23d is opened to the side surface 3a, and one end of the second space 23e is communicated with the insertion hole 12b.

The reflective surface 23f is inclined in the left-right direction and the vertical direction, and is formed by, for example, a reflective component such as acrylic being sprayed onto a predetermined surface of the movable side cavity plate 12E by a spray or the like, or a stainless steel plate is formed in the movable side cavity. It is formed by being attached to a predetermined surface of the plate 12E or by applying a silver solution to a predetermined surface of the movable side cavity plate 12E.

The ejector pin 19 and the movable pin 20 are slidably supported by the movable side cavity plate 12E, and the upper surface forms the insertion hole 12b in the state where the drive plate 17 is located at the lower moving end. Is matched to the bottom surface that forms.

In the movable type 3E, the window member 21E is inserted into the insertion hole 12b and arranged. The window member 21E is formed, for example, in a substantially rectangular plate shape (rectangular parallelepiped shape) whose thickness direction coincides with the separation and contact directions of the fixed type 2E and the movable type 3E, and is formed of a transparent resin material. .. The window member 21E is formed with a cavity portion 21i for a cavity that is opened upward.

In the injection molding die 1E configured as described above, when the fixed die 2E and the movable die 3E are butted against each other, the runner recess 12d of the fixed die 2E is formed as a runner 24 which is a flow path of the molten resin. The space inside the sprue 7 is communicated with the runner 24. At this time, the upper surface of the window member 21E is in close contact with the lower surface of the fixed-side cavity plate 5E, and the cavity recess 21i of the window member 21E is formed as the cavity 25E. The cavity 25E communicates with the runner 24.

When the molten resin 100 is injected into the cavity 25E, the operator can visually recognize the state of the cavity 25E from the observation hole 23E through the window member 21E through the window member 21E in the thickness direction of the window member 21E from the arrow A direction. The injection state of the molten resin 100 into 25E can be observed.

As described above, in the injection molding die 1E, the state of the cavity 25E can be visually recognized in the thickness direction of the window member 21E through the window member 21E, so that the visible area becomes large and the molten resin 100 into the cavity 25E is 100. It is possible to secure high visibility regarding the injection state of.

When the supply of the molten resin 100 to the cavity 25E is stopped, after a certain period of time, the molten resin 100 filled in the cavity 25E is cooled and solidified to form the molded product 200.

When the molten resin 100 filled in the cavity 25E is cooled and solidified, the movable mold 3E is moved downward and separated from the fixed mold 2E together with the window member 21E and the molded product 200, and the fixed mold 2E and the movable mold 3E are separated. Be typed.

When the fixed type 2E and the movable type 3E are released, the drive plate 17 is moved upward by the driving force of the drive rod, and as the drive plate 17 moves, the ejector pins 19, 19, ... And the movable pin 20 , 20, ... Are moved upward at the same time. When the ejector pins 19, 19, ... And the movable pins 20, 20, ... Are moved upward, the molded product 200 and the window member 21E are projected and taken out from the movable mold 3E.

When the molded product 200 and the window member 21E are taken out from the movable mold 3E, a new window member 21E is inserted into the insertion hole 12b and the window member 21E is replaced. Therefore, the window member 21E is replaced with a new window member 21E for each shot of the molten resin 100 on which one molded product 200 is formed.

In the injection molding die 1E, by observing the injection state of the molten resin 100 from the observation hole 23E through the window member 21E into the cavity 25E, the molding state of the molded product 200 can be evaluated and the molten resin injected into the cavity 25E. The evaluation of 100 can be performed, and conditions such as the flow velocity and the temperature of the molten resin 100 injected into the cavity 25E can be set according to these evaluation results.

Further, the injection molding die 1E is configured so that the state of the cavity 25E can be visually recognized from the observation hole 23E through the window member 21E via the reflective surface 23f, so that the position of the reflective surface 23f can be visually recognized. Optimal visibility can be ensured by the operator by changing the orientation and size.

Further, in the injection molding die 1E, the thickness direction of the window member 21E is set to match the separation / contact direction between the fixed die 2E and the movable die 3E, so that the direction of the window member 21E is movable with the fixed die 2E. It is optimized for the separation and contact direction of the mold 3E, and can be optimized in the molding operation when forming a molded product to be used as a product.

On the other hand, when the molding conditions are set as a preparatory step for forming the molded product 200, the molded product 200 is formed in the same shape and size as the window member 21E instead of the window member 21E, and is fixed to the movable mold 3E by bolts or the like. A metal mold (not shown) may be used. The metal mold can be used repeatedly during continuous molding in which the molten resin 100 is injected a plurality of times, and is used not only for setting molding conditions such as the injection pressure and flow velocity of the molten resin 100, but also for injection molding. It can also be used when the temperature of the mold 1E is raised or when the molten resin 100 staying in each part is discharged or replaced.

In the above-mentioned injection molding die 1E, an example is shown in which the cavity portion 21i of the window member 21E is formed as the cavity 25E. For example, the fixed mold 2E has a cavity recess and the window member 21E. The cavity 25E may be formed by the cavity recess 21i and the cavity recess of the fixed mold 2E. Further, the cavity recess may be formed in the fixed mold 2E instead of the cavity recess 21i, and the cavity recess of the fixed mold 2E may be formed as the cavity 25E.

<Mold for injection molding according to the seventh embodiment>
Next, the injection molding die 1F according to the seventh embodiment will be described (see FIG. 15).

In the injection molding die 1F shown below, the cavity is formed by the two window members, the orientation of the window members is different, and the observation hole is different from that of the injection molding die 1 described above. The only difference is that the cavity can be seen through the reflective surface and that two observation holes are formed. Therefore, in the following description of the injection molding die 1F, only the parts different from the injection molding die 1 will be described in detail, and the other parts will be the same parts in the injection molding die 1. The same reference numerals as those attached to are added and the description thereof will be omitted.

The injection molding die 1F has a fixed die 2F and a movable die 3F.

The fixed type 2F has a fixed side mounting plate 4 and a fixed side cavity plate 5F.

Neither the cavity recess 5a, the insertion hole 5b, nor the observation recess 5c is formed on the fixed-side cavity plate 5F.

An observation hole 23F is formed in the fixed side cavity plate 5F. The observation hole 23F is bent in an orthogonal direction and has a first space 23g extending left and right and a second space 23h extending vertically. On the fixed side cavity plate 5F, a reflecting surface 23i is formed in a continuous portion of the first space 23g and the second space 23h. One end of the first space 23g is opened to the side surface 2a, and one end of the second space 23h is opened to the lower surface of the fixed side cavity plate 5F.

The reflective surface 23i is inclined in the left-right direction and the vertical direction, and is formed by, for example, a reflective component such as acrylic being sprayed onto a predetermined surface of the fixed-side cavity plate 5F by a spray or the like, or a stainless steel plate is formed in the fixed-side cavity. It is formed by being attached to a predetermined surface of the plate 5F or by applying a silver solution to a predetermined surface of the fixed-side cavity plate 5F.

The movable type 3F has a movable side mounting plate 10, a connecting plate 11, a movable side cavity plate 12F, and a connecting plate 13.

The movable side cavity plate 12F is formed with a runner recess 12d that is continuously opened upward on the other side of the insertion hole 12b, and is continuously upward and laterally on one side of the insertion hole 12b. An open observation recess 12c is formed. The observation recess 12c is opened on the side surface 3a of the movable 3F. The cavity portion 12a for the cavity is not formed on the movable side cavity plate 12F.

A window member 21P and a window member 21Q made of a transparent resin material are arranged on the movable 3F, respectively. The window member 21P and the window member 21Q are formed, for example, in a substantially rectangular plate shape (rectangular parallelepiped shape) whose thickness direction coincides with the separation and contact directions of the fixed type 2F and the movable type 3F. The window member 21Q is formed with a cavity portion 21j opened upward. Pin insertion holes 21k, 21k, ... Penetrated vertically are formed in the window member 21Q, and the upper ends of the pin insertion holes 21k, 21k, ... Are opened in the bottom surface forming the cavity recess 21j, and the lower end thereof is formed. It is opened on the lower surface of the window member 21Q.

The window member 21P and the window member 21Q are vertically connected by, for example, coupling pins 31, 31, .... By connecting the window member 21P and the window member 21Q, the cavity recess 21j is formed as the cavity 25F. The window member 21Q is inserted into the insertion hole 12b of the movable 3F and arranged in a state of being coupled to the window member 21P. In the state where the window member 21Q is inserted into the insertion hole 12b, the ejector pins 19, 19, ... Are inserted into the pin insertion holes 21k, 21k, ..., Respectively. The upper surface of the ejector pin 19 coincides with the bottom surface forming the cavity recess 21j or the bottom surface forming the runner recess 12d in a state where the drive plate 17 is located at the lower moving end.

In the injection molding mold 1F configured as described above, when the movable mold 3F is moved upward with respect to the fixed mold 2F and the fixed mold 2F and the movable mold 3F are abutted against each other, the observation recess 12c becomes the observation hole 23P. Formed as. The observation hole 23P is opened on the side surface 3a of the movable 3F. When the fixed type 2F and the movable type 3F are butted against each other, the runner recess 12d is communicated with the space inside the sprue 7, and the runner recess 12d is formed as the runner 24F. The cavity 25F communicates with the runner 24F.

When the fixed type 2F and the movable type 3F are butted against each other, the molten resin 100 is supplied to the sprue 7 from the supply nozzle. The molten resin 100 is ejected from the sprue 7 through the runner 24F into the cavity 25F, and the cavity 25F is filled with the molten resin 100.

When the molten resin 100 is injected into the cavity 25F, the operator can visually recognize the state of the cavity 25F from the observation hole 23F through the window member 21P in the thickness direction of the window member 21P from the direction of the arrow A, and the window member from the observation hole 23P. The state of the cavity 25F can be visually recognized from the direction of arrow B in the direction orthogonal to the thickness direction through the 21P and the window member 21Q, and the injection state of the molten resin 100 into the cavity 25F can be observed from two different directions.

As described above, in the injection molding die 1F, the state of the cavity 25F can be visually recognized in the thickness direction of the window member 21P through the window member 21P, so that the visible area becomes large and the molten resin 100 into the cavity 25F is 100. It is possible to secure high visibility regarding the injection state of.

When the molten resin 100 filled in the cavity 25F is cooled and solidified, the movable mold 3F is moved downward, and the window member 21P and the window member 21Q are separated from the fixed mold 2F together with the molded product 200 and are movable with the fixed mold 2F. Mold 3F is released.

When the fixed type 2F and the movable type 3F are released, the drive plate 17 is moved upward, and as the drive plate 17 moves, the ejector pins 19, 19, ... And the movable pins 20, 20, ... Is moved upward at the same time. When the ejector pins 19, 19, ... And the movable pins 20, 20, ... Are moved upward, the window member 21Q and the window member 21P are projected together with the molded product 200 in a state of being coupled to the insertion hole. Taken from 12b.

As described above, in the injection molding die 1F, the cavity 25F is formed by the window member 21P and the window member 21Q, and since the window member 21P and the window member 21Q are made of resin, the cavity 25F can be easily formed. It is possible. Therefore, by forming the cavity 25F into a desired shape, the cavity 25F can be easily formed according to the shape of the required molded product 200, and the degree of freedom in design can be improved.

Further, in the injection molding die 1F, the molded state of the molded product 200 is observed by observing the injection state of the molten resin 100 from the observation hole 23F and the observation hole 23P into the cavity 25F through the window member 21P and the window member 21Q. It is possible to perform evaluation and evaluation of the molten resin 100 injected into the cavity 25F, and it is possible to set conditions such as the flow velocity and temperature of the molten resin 100 injected into the cavity 25F according to these evaluation results. ..

Further, by using the window member 21P and the window member 21Q, it is possible to evaluate the molding state of the molded product 200, and the shape of the cavity 25F can be arbitrarily changed according to the evaluation result.

Furthermore, since the injection molding die 1F is configured so that the state of the cavity 25F can be visually recognized from the observation hole 23F through the window member 21P via the reflective surface 23i, the reflective surface 23i has a structure. Optimal visibility can be ensured by the operator by changing the position, orientation and size.

Further, in the injection molding die 1F, the thickness direction of the window member 21P and the window member 21Q is set to match the separation and contact directions of the fixed mold 2E and the movable mold 3E, so that the window member 21P and the window member 21Q The orientation of the fixed mold 2E and the movable mold 3E is optimized with respect to the separation and contacting directions, and the molding work when forming the molded product used as a product can be optimized.

In addition, since the state of the cavity 25F can be visually recognized from two different directions by the observation hole 23F and the observation hole 23P, high visibility with respect to the flow state of the molten resin 100 injected into the cavity 25F can be ensured.

On the other hand, when the molding conditions are set as a preparatory step for forming the molded product 200, the window member 21P and the window member 21Q are formed in the same shape and size instead of the window member 21P and the window member 21Q, respectively. Two metal molds fixed to the fixed mold 2F or the movable mold 3F with bolts or the like may be used. These metal dies can be repeatedly used during continuous molding in which the molten resin 100 is injected a plurality of times, and can be used for setting molding conditions such as the injection pressure and flow velocity of the molten resin 100, as well as injection molding. It can also be used when the temperature of the mold 1F is raised or when the molten resin 100 staying in each part is discharged or replaced.

Although the example in which the cavity 25F is formed by the two window members of the window member 21P and the window member 21Q is shown above, the cavity may be formed by three or more window members.

<Mold for injection molding according to the eighth embodiment>
Next, the injection molding die 1G according to the eighth embodiment will be described (see FIGS. 16 and 17).

Compared to the above-mentioned injection molding die 1, the injection molding die 1G shown below has a cavity formed by two window members, the orientation of the window members is different, and an observation hole. The only difference is that the cavity can be seen through the reflective surface and that three observation holes are formed. Therefore, in the following description of the injection molding die 1G, only the parts different from the injection molding die 1 will be described in detail, and the other parts will be the same parts in the injection molding die 1. The same reference numerals as those attached to are added and the description thereof will be omitted.

The injection molding die 1G has a fixed die 2G and a movable die 3G (see FIG. 16).

The fixed type 2G has a fixed side mounting plate 4 and a fixed side cavity plate 5G.

An insertion hole 5b and an observation recess 5c are formed in the fixed-side cavity plate 5G. The observation recess 12c is continuously opened downward and laterally on one side of the insertion hole 12b, and is opened on the side surface 2a of the fixed mold 2G. The cavity plate 5G on the fixed side is not formed with the cavity 5a.

An observation hole 23G is formed in the fixed side cavity plate 5G. The observation hole 23G is bent in an orthogonal direction and has a first space 23l extending left and right and a second space 23m extending vertically. In the fixed side cavity plate 5G, a reflecting surface 23n is formed in a continuous portion of the first space 23l and the second space 23m. One end of the first space 23l is opened to the side surface 2a, and one end of the second space 23m is opened to the insertion hole 5b.

The reflective surface 23n is inclined in the left-right direction and the vertical direction, and is formed by, for example, a reflective component such as acrylic being sprayed onto a predetermined surface of the fixed-side cavity plate 5G by a spray or the like, or a stainless steel plate is formed in the fixed-side cavity. It is formed by being attached to a predetermined surface of the plate 5G or by applying a silver solution to the predetermined surface of the fixed-side cavity plate 5G.

The movable type 3G has a movable side mounting plate 10, a movable side cavity plate 12G, and a connecting plate 13. The movable 3G is not provided with the connecting plate 11. In the movable type 3G, an arrangement space 9 is formed inside by a movable side mounting plate 10, a movable side cavity plate 12G, and a connecting plate 13.

The movable side cavity plate 12G is formed with a runner recess 12d that is continuously opened upward on the other side of the insertion hole 12b, and is continuously upward and laterally on one side of the insertion hole 12b. An open observation recess 12c is formed. The observation recess 12c is opened on the side surface 3a of the movable 3G. The cavity portion 12a for the cavity is not formed on the movable side cavity plate 12G.

An observation hole 23Q is formed in the movable side cavity plate 12G. The observation hole 23Q is bent in an orthogonal direction and has a first space 23o extending left and right and a second space 23p extending vertically. In the movable side cavity plate 12G, a reflecting surface 23q is formed in a continuous portion of the first space 23o and the second space 23p. One end of the first space 23o is opened to the side surface 3a, and one end of the second space 23p is opened to the insertion hole 12b.

The reflective surface 23q is inclined in the left-right direction and the vertical direction, and is formed by, for example, a reflective component such as acrylic being sprayed onto a predetermined surface of the movable side cavity plate 12G by a spray or the like, or a stainless steel plate is formed in the movable side cavity. It is formed by being attached to a predetermined surface of the plate 12G or by applying a silver solution to a predetermined surface of the movable side cavity plate 12G.

A window member 21V and a window member 21W formed of a transparent resin material are arranged in the injection molding die 1G, respectively. The window member 21V and the window member 21W are formed, for example, in a substantially rectangular plate shape (rectangular parallelepiped shape) whose thickness direction coincides with the separation and contact directions of the fixed type 2G and the movable type 3G. The window member 21W is formed with a cavity portion 21l opened upward. The window member 21W is formed with pin insertion holes 21m, 21m, ... Penetrated vertically, and the upper ends of the pin insertion holes 21m, 21m, ... It is opened on the lower surface of the window member 21W.

The window member 21V and the window member 21W are vertically connected by, for example, coupling pins 32, 32, .... By combining the window member 21V and the window member 21W, the cavity recess 21l is formed as the cavity 25G. The window member 21W is inserted into the insertion hole 12b of the movable 3G and arranged in a state of being coupled to the window member 21V. When the window member 21W is inserted into the insertion hole 12b, the ejector pins 19, 19, ... Are inserted into the pin insertion holes 21m, 21m, ..., Respectively. The upper surface of the ejector pin 19 coincides with the bottom surface forming the cavity recess 21l or the bottom surface forming the runner recess 12d in a state where the drive plate 17 is located at the lower moving end.

In the injection molding die 1G configured as described above, when the movable mold 3G is moved upward with respect to the fixed mold 2G and the fixed mold 2G and the movable mold 3G are abutted against each other, the observation recess 5c and the observation recess The observation hole 23R is formed by 12c. When the fixed type 2G and the movable type 3G are butted against each other, the runner recess 12d is communicated with the space inside the sprue 7, and the runner recess 12d is formed as the runner 24G. The cavity 25G communicates with the runner 24G.

When the fixed type 2G and the movable type 3G are butted against each other, the molten resin 100 is supplied to the sprue 7 from the supply nozzle. The molten resin 100 is ejected from the sprue 7 through the runner 24G into the cavity 25G, and the cavity 25G is filled with the molten resin 100.

When the molten resin 100 is injected into the cavity 25G, the operator can visually recognize the state of the cavity 25G from the observation hole 23G through the window member 21V in the thickness direction of the window member 21V from the direction of the arrow A, and the window member from the observation hole 23R. The state of the cavity 25G can be visually recognized from the direction of arrow B through the 21V and the window member 21W in the direction orthogonal to the thickness direction, and the state of the cavity 25G can be visually recognized from the observation hole 23Q through the window member 21W in the thickness direction of the window member 21W. It can be visually recognized from the direction, and the injection state of the molten resin 100 into the cavity 25G can be observed from three different directions.

As described above, in the injection molding die 1G, the state of the cavity 25G can be visually recognized in the thickness direction of the window member 21V through the window member 21V, and the state of the cavity 25G can be visually recognized in the thickness direction of the window member 21W through the window member 21W. Since the visible area can be visually recognized, the visible area becomes large, and high visibility regarding the injection state of the molten resin 100 into the cavity 25G can be ensured.

Further, in the injection molding die 1G, the molded product 200 is formed by observing the injection state of the molten resin 100 from the observation hole 23G, the observation hole 23Q, and the observation hole 23R into the cavity 25G through the window member 21V and the window member 21W. It is possible to evaluate the molding state of the mold and the molten resin 100 injected into the cavity 25G, and set conditions such as the flow velocity and temperature of the molten resin 100 injected into the cavity 25G according to these evaluation results. Is possible.

When the molten resin 100 filled in the cavity 25G is cooled and solidified, the movable type 3G is moved downward, and the window member 21V and the window member 21W are separated from the fixed type 2G together with the molded product 200 and are movable with the fixed type 2G. Mold 3G is released.

When the fixed type 2G and the movable type 3G are released, the drive plate 17 is moved upward, and as the drive plate 17 moves, the ejector pins 19, 19, ... And the movable pins 20, 20, ... Is moved upward at the same time. When the ejector pins 19, 19, ... And the movable pins 20, 20, ... Are moved upward, the window member 21W and the window member 21V are projected together with the molded product 200 in a state of being coupled to the insertion hole. Taken from 12b.

As described above, in the injection molding die 1G, the cavity 25G is formed by the window member 21V and the window member 21W, and since the window member 21V and the window member 21W are made of resin, the cavity 25G can be easily formed. It is possible. Therefore, by forming the cavity 25G into a desired shape, the cavity 25G can be easily formed according to the shape of the required molded product 200, and the degree of freedom in design can be improved.

Further, by using the window member 21V and the window member 21W, it is possible to evaluate the molding state of the molded product 200, and the shape of the cavity 25G can be arbitrarily changed according to the evaluation result.

Further, in the injection molding die 1G, the state of the cavity 25G can be visually recognized from the observation hole 23G and the observation hole 23Q through the window member 21V and the window member 21W via the reflection surface 23n and the reflection surface 23q, respectively. Therefore, the optimum visibility can be ensured by the operator by changing the positions, orientations, and sizes of the reflecting surface 23n and the reflecting surface 23q.

Furthermore, in the injection molding mold 1G, the thickness direction of the window member 21V and the window member 21W is set to match the separation and contact directions of the fixed mold 2G and the movable mold 3G, so that the window member 21V and the window member The orientation of 21W is optimized for the separation and contact directions of the fixed type 2G and the movable type 3G, and can be optimized in the molding work when forming the molded product used as a product.

In addition, since the state of the cavity 25G can be visually recognized from three different directions by the observation hole 23G, the observation hole 23Q, and the observation hole 23R, higher visibility with respect to the flow state of the molten resin 100 injected into the cavity 25G is ensured. can do.

Further, in a state where the fixed type 2G and the movable type 3G are butted against each other, the window member 21V is inserted into the insertion hole 5b of the fixed type 2G and the window member 21W is inserted into the insertion hole 12b of the movable type 3G. The cavity 25G can be filled with the molten resin 100 while ensuring a high strength and a stable holding state of the window member 21W.

On the other hand, when the molding conditions are set as a preparatory step for forming the molded product 200, the window member 21V and the window member 21W are formed in the same shape and size instead of the window member 21V and the window member 21W, respectively. Two metal molds fixed to the fixed mold 2G or the movable mold 3G by bolts or the like may be used. These metal dies can be repeatedly used during continuous molding in which the molten resin 100 is injected a plurality of times, and can be used for setting molding conditions such as the injection pressure and flow velocity of the molten resin 100, as well as injection molding. It can also be used when the temperature of the mold 1G is raised or when the molten resin 100 staying in each part is discharged or replaced.

The above is an example of an injection molding die 1G in which three observation holes 23G, observation holes 23R, and observation holes 23Q are formed side by side in the separation and contact directions of the fixed mold 2G and the movable mold 3G. However, for example, the three observation holes 23G, the observation hole 23R, and the observation hole 23Q may be positioned side by side in a direction orthogonal to the separation and contact directions of the fixed type 2G and the movable type 3G (see FIG. 17). In this case, the observation hole 23G, the observation hole 23R, and the observation hole 23Q may be formed in the movable type 3G, and at least one of the observation hole 23G, the observation hole 23R, and the observation hole 23Q is in the fixed type 2G and the movable type 3G. It may be formed at all positions.

In this case as well, since the state of the cavity 25G can be visually recognized from the observation hole 23G, the observation hole 23Q, and the observation hole 23R from three different directions, higher visibility with respect to the flow state of the molten resin 100 injected into the cavity 25G can be obtained. Can be secured.

Further, a configuration that can be observed from two directions (see FIG. 15) and a configuration that can be observed from three directions (see FIG. 17) may be combined to form a configuration that can be observed from four directions, or can be observed from three directions. A possible configuration (see FIG. 16) and a configuration observable from three directions (see FIG. 17) may be combined to form a configuration observable from five directions.

In these cases, the number of observation directions is further increased, and even higher visibility with respect to the flowing state of the molten resin 100 can be ensured.

Although the example in which the cavity 25G is formed by the two window members of the window member 21V and the window member 21W is shown above, the cavity may be formed by three or more window members.

<Summary>
As described above, in the injection molding die 1 (including the injection molding die 1A to the injection molding die 1G; the same applies hereinafter), the window member 21 made of a transparent resin material is used. (Including the window member 21A to the window member 21W; the same applies hereinafter) is attached to and detachable from the movable type 3 (including the movable type 3A to the movable type 3G; the same applies hereinafter), and the cavity 25 is passed through the window member 21. An observation hole 23 (including the observation hole 23A to the observation hole 23R; the same applies hereinafter) is formed so that the observation hole 23 (including the cavity 25A to the cavity 25G; the same applies hereinafter) can be visually recognized, and the fixed mold 2 and the movable mold 3 are separated from each other. The window member 21 is taken out from the movable mold 3 by the take-out member at the time of molding.

Therefore, the cavity 25 can be visually recognized from the observation hole 23 through the window member 21 formed of the transparent resin material, and the fixed mold 2 and the movable mold 3 can be removed from the movable mold 3 by the taking-out member. The window member 21 taken out can be replaced with a new window member 21. As a result, high visibility regarding the state of the molten resin 100 injected into the cavity 25 can be ensured without causing a rise in manufacturing cost or a defect due to a mechanical impact.

In particular, since the window member 21 is made of a resin material, it is difficult for the window member 21 to break when the window member 21 is deformed by the pressure at the time of filling the cavity 25 with the molten resin 100, and it is difficult for the fragments to diffuse due to the breakage and the fragments. It is unlikely that the safety will be reduced due to the above.

Further, since the window member 21 is formed of a resin material, the window member 21 can be easily formed by cutting a commercially available material or the like, and the window member 21 can be easily and in large quantities at low cost. Can be done.

Further, since it is possible to set the optimum molding conditions and discharge the stagnant molten resin 100 by using the window member 21 and the metal mold (including the metal molds 26, 28, 29), it is used as a product. It is possible to improve the productivity of the molded product by performing continuous molding at the time of forming the molded product.

Further, in the injection molding die 1, a movable pin 20 is provided as an extraction member, and the window member 21 is ejected from the movable die 3 by the movable pin 20.

Therefore, since the window member 21 is projected from the movable mold 3 by the movable pin 30 that can be moved with respect to the movable mold 3, the window member 21 can be easily and surely taken out from the movable mold 3 by a simple structure. ..

Further, the injection molding die 1 is provided with an ejector pin 19 for projecting a molded product 200 formed by solidifying the molten resin 100 filled in the cavity 25 from the movable mold 3, and the ejector pin 19 is provided. And the movable pin 20 are simultaneously moved with respect to the movable mold 3, and the molded product 200 and the window member 21 are simultaneously taken out from the movable mold 3.

Therefore, since the molded product 200 and the window member 21 are taken out from the movable mold 3 by the ejector pin 19 and the movable pin 20 without a time lag, the working time in the injection molding mold 1 can be shortened.

Furthermore, in the injection molding die 1, a drive plate 17 that can be moved with respect to the movable die 3 is provided, and an ejector pin 19 and a movable pin 20 are attached to the drive plate 17, and the ejector pin 19 and the movable pin 19 are movable. The pin 20 is moved at the same time as the drive plate 17 is moved.

Therefore, since a separate drive unit for moving the ejector pin 19 and the movable pin 20 is not required, the work time in the injection molding die 1 is shortened while simplifying the structure and reducing the number of parts. Can be achieved.

1 Injection molding mold 2 Fixed mold 3 Movable mold 14 First holding part 15 Second holding part 17 Drive plate 19 Ejector pin 20 Movable pin 21 Window member 25 Cavity 100 Molten resin 200 Molded product 1A Injection molding mold 2A Fixed mold 21A Window member 25A Cavity 1B Injection molding mold 2B Fixed mold 3B Movable mold 21B Window member 25B Cavity 1C Injection molding mold 2C Fixed mold 3C Movable mold 25C Cavity 21L Window member 21M Window member 1D Injection molding mold Mold 2D Fixed 3D Movable 21D Window member 25D Cavity 23c Reflective surface 1E Injection molding mold 2E Fixed mold 3E Movable 21E Window member 25E Cavity 23f Reflective surface 1F Injection molding mold 2F Fixed mold 3F Movable 25F Cavity 21P Window member 21Q Window member 23i Reflective surface 1G Injection molding mold 2G Fixed type 3G Movable type 25G Cavity 21V Window member 21W Window member 23n Reflective surface 23q Reflective surface

Claims (11)

Fixed type placed in a fixed state,
A movable type that can be moved with respect to the fixed type,
It is equipped with a take-out member that is movable with respect to the movable type.
A window member formed of a transparent thermoplastic resin material or a transparent thermosetting resin material is made removable from the movable type.
At least one of the fixed mold and the movable mold is formed with an observation hole in which the cavity can be visually recognized through the window member attached to the movable mold.
An injection molding die in which the window member is taken out from the movable mold by the take-out member when the fixed mold and the movable mold are released. The injection molding die according to claim 1, wherein the cavity is formed by the window member and at least one of the fixed mold and the movable mold. A plurality of the window members are provided,
The injection molding die according to claim 1, wherein the cavity is formed by a plurality of the window members. A movable pin is provided as the take-out member, and a movable pin is provided.
The injection molding die according to any one of claims 1 to 3, wherein the window member is ejected from the movable mold by the movable pin and is taken out from the movable mold. An ejector pin is provided to project a molded product formed by solidifying the molten resin filled in the cavity from the movable mold.
The injection molding die according to claim 4, wherein the ejector pin and the movable pin are simultaneously moved with respect to the movable mold, and the molded product and the window member are simultaneously taken out from the movable mold. A movable drive plate is provided for the movable type, and a movable drive plate is provided.
The ejector pin and the movable pin are attached to the drive plate, and the ejector pin and the movable pin are attached to the drive plate.
The injection molding die according to claim 5, wherein the ejector pin and the movable pin are simultaneously moved with the movement of the drive plate. The injection molding die according to any one of claims 1 to 6, wherein a holding portion for holding the window member is formed on the movable mold. A plurality of the observation holes are formed,
The injection molding die according to any one of claims 1 to 7, wherein the cavity is made visible from different directions through the window member. A reflective surface is formed on at least one of the fixed type and the movable type.
The injection molding die according to any one of claims 1 to 8, wherein the cavity is made visible through the window member from the observation hole through the reflective surface. The injection molding die according to any one of claims 1 to 9, wherein the total light transmittance of the window member is 70% or more. The injection molding die according to any one of claims 1 to 10, wherein the heat distortion temperature of the window member is 60 degrees or higher.

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