JP6741354B2 - Mold for molding - Google Patents

Description

The present invention relates to a molding die that houses a nest inside and manufactures a molded product by injection molding.

In the molding die, the temperature of the die itself needs to be appropriately controlled during injection molding in order to suppress defective molding of the molded product. Therefore, for example, the molding die disclosed in Japanese Patent No. 4503351 is provided with a plurality of cavities and a through passage communicating with each cavity on the back side of the cavities of the fixed-side die and the movable-side die. The heat medium (high-temperature water, low-temperature water) is made to flow through the cavities and the through passages. That is, the temperature of the molding die can be adjusted by flowing the heat medium.

Further, in this type of injection molding, a nest may be housed and fixed in a molding die, and the temperature may be partially (or entirely) adjusted by the nest. For example, the temperature can be adjusted by providing a flow path for flowing the heat medium inside the nest.

By the way, when a relatively large molded product such as a cowl of a vehicle (a motorcycle or the like) is injection-molded, the nest is inevitably large and has a complicated shape. For this reason, the flow path of the heat medium provided in the insert is also lengthened. Therefore, even if the temperature is adjusted by nesting at the time of injection molding of the molded product, a large amount of energy (heating energy and cooling energy) is eventually required, which is a factor of increasing the manufacturing cost.

The present invention has been made in view of the above circumstances, and by a simple configuration, by making it possible to quickly adjust or maintain the temperature of the nest, to save energy during injection molding, to reduce the manufacturing cost. An object is to provide a molding die that can be reduced.

In order to achieve the above-mentioned object, a molding die according to the present invention includes a first die and a second die that are clamped, and a nest arranged in the first die, The nest can form a cavity into which the molding material flows in between the nest and the second mold, and further, a contact portion that abuts the first mold in an expanded state due to a temperature increase, and the expansion. In this state, a non-contact portion that forms a non-contact with a gap between the first mold and a non-contact portion that extends from the end face on the opposite side where the cavity is formed to the vicinity of the cavity, and to possess a hollow portion of Hiren through, the, the first mold has a housing space for housing the nest, the gap, the in the back side of the housing space than the contact portion, and wherein The gap is partially closed at the end surface of the first mold, which is formed over the entire circumference of the inner peripheral surface of the accommodation space in the circumferential direction and is opposite to the end surface of the first mold that abuts against the insert, and A driven insert, which is a separate member and is configured to be displaceable, is provided, and the driven insert allows thermal expansion and contraction of the insert while continuing to close the gap .

According to the above, the molding die can favorably position the first die and the nest by the contact portion of the nest, and the cavity can be formed accurately. Further, in the expanded state, a gap is formed between the first mold and the non-contact portion of the nest, so that heat conduction between the nest and the first mold is favorably suppressed by the heat insulating effect of the gap. To be done. Further, since the insert has the hollow portion, the hollow portion also has a heat insulating effect. Therefore, the temperature of the nest can be maintained with a simple configuration, and the energy required for adjusting the temperature of the nest during injection molding can be saved. As a result, the manufacturing cost for manufacturing the molded product is reduced. In addition, since the molding die has the driven insert, it is possible to favorably prevent thermal expansion of the insert and prevent the molding material from entering the gap.

Moreover, further comprising a fixing member for connecting and supporting the nest and the first mold, the fixing member is Rukoto provided closer to the nest and abutting side of the center of the receiving space are preferred.

Further, it is preferable that the insert has a flow passage through which a heat medium for adjusting the temperature of the insert itself is circulated, and the flow passage can remove the heat medium as necessary.

This allows the insert to quickly adjust the temperature of the insert itself through the flow passage. In addition, by removing the heat medium, the flow passage can exhibit a heat insulating effect as in the hollow portion.

Furthermore, it is preferable that the flow passage is provided at least in a molding portion that forms the cavity on the second mold side with respect to the hollow portion.

Thus, the temperature of the molding portion of the insert is smoothly adjusted by the heat medium, so that the molding material injected into the cavity can be given an appropriate temperature.

Further, it is preferable that the flow passage is formed so as to further extend between the gap and the hollow portion and communicates with the flow passage provided in the molding portion.

As described above, the flow passage extends between the gap and the hollow portion, so that the heat insulating effect can be exerted around the flow passage and the temperature change can be suppressed to allow the heat medium to flow favorably.

Further, the molding die according to the present invention includes a first die and a second die for performing die clamping, and a nest arranged in the first die, and the nest includes the second die. A cavity into which the molding material flows can be formed between the die and the die, and further, a contact portion that comes into contact with the first die in an expanded state due to a temperature rise, and the first die in the expanded state. A non-contact portion that forms a non-contact with a mold and a hollow portion that extends from the end face on the opposite side where the cavity is formed to the vicinity of the cavity and is not in communication with the cavity. And the insert has a flow passage through which a heat medium for adjusting the temperature of the insert itself is circulated, and the flow passage constitutes the cavity on the second mold side with respect to the hollow portion. At least in the formed meat portion, is formed so as to extend between the gap and the hollow portion, and communicates with the flow passage provided in the formed meat portion.

Furthermore, it is preferable that the heat transfer medium can be removed from the flow passage as needed .

This allows the flow passage to exhibit a heat insulating effect like the hollow portion by removing the heat medium.

Furthermore, it is preferable that the nest includes a plurality of hollow portions sandwiching a wall portion .

With this, the molding die includes the plurality of hollow portions, so that the heat insulation effect of the insert can be further enhanced while maintaining the shape of the insert .

Further , a heat insulating member may be provided between the insert and the first mold .

With this, in the molding die, the heat insulating member can further suppress the conduction of heat to the first die.

Further, it is preferable that the heat medium contains a refrigerant, and the flow passage is configured as a cooling mechanism that cools the insert during injection molding.

Thus, the molding die can easily cool the insert by the cooling mechanism that causes the refrigerant to flow in the flow passage, and can favorably solidify the molding material .

Furthermore, it is preferable that the flow passages are grouped for each part of the nest so that the heat medium can flow through each part .

With this, in the molding die, the flow passages are grouped for each nest portion, so that detailed temperature adjustment can be performed according to the portion of the molded product .

According to the present invention, the molding die is capable of quickly adjusting or maintaining the temperature of the insert with a simple configuration, thereby saving energy during injection molding and reducing the manufacturing cost. ..

It is an explanatory view showing roughly the metallic mold for injection and the injection molding device concerning one embodiment of the present invention. It is a perspective view which shows the whole structure of the nest of FIG. It is explanatory drawing which expands and shows the movable type|mold and nest of FIG.

Hereinafter, preferred embodiments of a molding die according to the present invention will be described in detail with reference to the accompanying drawings.

A molding die 10 according to an embodiment of the present invention is a molding die for injection molding a cowl (molded product) of a vehicle, and is provided in an injection molding device 12 as shown in FIG. In the following description, directions will be indicated based on the directions of arrows X, Y, and Z in FIG. 1 as necessary. Specifically, the arrow X direction is the left-right direction in FIG. 1, the arrow Y direction is the front-back direction on the paper surface of FIG. 1, and the arrow Z direction is the up-down direction in FIG.

The molding die 10 has a fixed die 14 (second die), a movable die 16 (first die), and a nest 18 as main components. The insert 18 has a function of adjusting the temperature of the insert 18 itself, and is attached to the movable mold 16 to construct a cavity 20 between the movable mold 16 and the fixed mold 14. The molding product is molded by injecting the molding material into the cavity 20.

The cowl, which is a molded product, has a predetermined length in the front-rear direction (arrow Z direction) and width direction (arrow Y direction) of the vehicle, and also has a sufficient length in the height direction (arrow X direction). Formed into a shape. Therefore, the molding die 10 also has a sufficient length in the arrow X direction. Of course, the molded product manufactured by the molding die 10 is not limited to the cowl. The shape of the cavity 20 of the molding die may be appropriately designed according to the shape of the molded product.

The injection molding device 12 has a mold clamping mechanism 22 for clamping the molding die 10, and the mold clamping mechanism 22 supports the fixed mold 14 by a fixed platen 24 while the movable mold 16 is moved by a movable plate 26. Support by. The fixed platen 24 is firmly fixed to a support body (not shown) provided in the injection molding device 12, so that the fixed mold 14 is arranged to face the movable mold 16.

The movable platen 26 is connected and fixed to a movable actuator 28. The movable actuator 28 operates under the control of the control unit 30 of the injection molding apparatus 12 to reciprocate the movable platen 26 and the movable die 16 in the arrow X direction. The movable die 16 moves in the direction of the arrow X1 relative to the fixed die 14, so that the movable die 16 and the fixed die 14 come close to and contact with each other (mold clamping). On the contrary, when the movable die 16 moves in the direction of the arrow X2 relative to the fixed die 14, the die clamping of the movable die 16 and the fixed die 14 is released, and the movable die 16 is separated from the fixed die 14.

The injection molding device 12 also has an injection mechanism 32 that injects the molding material toward the cavity 20. The injection mechanism 32 includes an injection nozzle 34 that is inserted through the fixed plate 24 and communicates with the spool 40 of the fixed mold 14. Further, the injection mechanism 32 is provided with a hopper, a heater, a screw and the like which are not shown. Under the control of the control unit 30, the injection mechanism 32 supplies the molding material from the hopper to the injection nozzle 34, and heats and melts the molding material by the heater, while moving the screw in the injection nozzle 34 under rotational drive. .. As a result, the injection nozzle 34 injects the molding material from the tip. It should be noted that the injection mechanism 32 may have other configurations.

The fixed die 14 of the molding die 10 constitutes one surface of the cavity 20 as described above. The fixed die 14 includes a base portion 36 that is connected to the fixed platen 24, and a convex portion 38 that is continuous with the base portion 36 and that projects from the base portion 36 toward the movable die 16 (in the arrow X2 direction).

The base portion 36 is formed in a block shape having a predetermined thickness, and when viewed from the movable die 16 side, the base portion 36 is wider in the outer direction (arrow YZ direction) than the convex portion 38. A surface of the base 36 facing the movable mold 16 (a surface around the convex portion 38) constitutes a partition surface 36 a which is a boundary reference of the molding die 10.

The partition surface 36a of the base portion 36 is provided with a guide pin bush 36b that cooperates with a guide pin 56 described later to guide and position the mold clamping of the molding die 10. Further, inside the base portion 36, there are provided a spool 40, a runner 42, and a gate 44 which communicate between the cavity 20 and the injection nozzle 34 and supply the molten metal of the molding material.

The convex portion 38 of the fixed mold 14 is formed so as to project according to the shape of the molded product, and faces the insert 18 housed in the movable mold 16. That is, a mold shape that forms one surface of the molded product is formed on the surface of the convex portion 38 (the portion protruding from the partition surface 36a).

Although not shown, the fixed mold 14 has an ejector mechanism that takes out the injection-molded molded product from the fixed mold 14. The ejector mechanism may be provided in the movable mold 16 or the nest 18.

On the other hand, the movable die 16 of the molding die 10 is formed in a concave shape having an accommodation space 16 a for accommodating the nest 18. Specifically, the movable die 16 includes a bottom wall 46 fixed to the movable plate 26 and side walls 48 protruding from four sides of the bottom wall 46 in the arrow X1 direction, and has a box shape as a whole. There is. Further, the movable mold 16 is provided with a driven insert 50 which is configured as a member different from the insert 18 and operates based on the expansion of the insert 18.

A fixing member 52 such as a bolt for fixing the insert 18 is provided on the bottom wall 46 of the movable mold 16. A heat insulating plate 54 (heat insulating member) is provided on the surface of the bottom wall 46 facing the accommodation space 16a. On the other hand, the side wall 48 surrounds the accommodation space 16a, and the end face of the projecting end (the end portion on the opposite side to the bottom wall 46) of the side wall 48 constitutes a partition face 48a that faces the partition face 36a of the fixed mold 14. .. Further, the side wall 48 is provided with a plurality of guide pins 56 protruding from the partition surface 48a in the arrow X1 direction.

The fixing member 52 penetrates the bottom wall 46 of the movable mold 16 and the heat insulating plate 54 to connect and retain the insert 18. Here, the molding die 10 takes into consideration the degree of expansion of the insert 18 due to heating during injection molding, and the fixing member 52 functions as a base point when the insert 18 expands.

The heat insulating plate 54 is arranged and fixed between the movable die 16 (bottom wall 46) and the nest 18, thereby suppressing heat conduction between the bottom wall 46 and the nest 18. The heat insulating plate 54 is formed in a flat shape, and the plate surface thereof is provided with holes through which the fixing member 52 and the flow passages 68 and 74 described later pass. The material of the heat insulating plate 54 is not particularly limited, and may be made of, for example, a ceramic having a bubble (a porous body), a material having a low thermal conductivity, or the like.

The guide pin 56 projects shortly from the partition surface 48a of the movable die 16 and is inserted into the guide pin bush 36b on the fixed die 14 side when the fixed die 14 and the movable die 16 are closed. As a result, the fixed die 14 and the movable die 16 are prevented from being displaced from each other in the arrow YZ direction, and the molded product is accurately molded.

Further, the insert 18 of the molding die 10 is inserted and fixed in the accommodation space 16 a, whereby the insert 18 is arranged and fixed at a position facing the convex portion 38 of the fixed mold 14. The insert 18 has a sufficient thickness from the bottom wall 46 toward the fixed mold 14 in order to form a molded product having a predetermined height as described above.

The thickness of the insert 18 corresponds to the protruding length of the movable die 16 (side wall 48), and the peripheral portion 58 near the side wall 48 protrudes from the bottom wall 46 until it coincides with the partition surface 48a. On the other hand, the portion inside the peripheral portion 58 is recessed from the partition surface 62a to the bottom wall 46 side in correspondence with the shape of the convex portion 38 of the fixed mold 14.

The peripheral portion 58 of the insert 18 is in the vicinity of the opening of the movable die 16 (on the side of the arrow X1) in the expanded state due to the temperature rise of the insert 18 and is in close contact (contact) with the inner peripheral surface of the side wall 48. Have. Further, the peripheral portion 58 of the insert 18 has a non-contact portion 58b on the inner side of the accommodation space 16a than the contact portion 58a, which is not in contact with the inner peripheral surface of the side wall 48 even in the expanded state due to the temperature increase of the insert 18. Have. That is, a part of the insert 18 forms a gap 60 with respect to the movable die 16.

More specifically, the insert 18 is functionally divided into a formed-thickness portion 62 and a thinned-out portion 64 along the thickness direction (direction of arrow X).

The molding portion 62 is a portion that is located directly away from the bottom wall 46 and directly faces the fixed mold 14. The molding wall portion 62 has a sufficient wall thickness capable of maintaining the cavity 20 during injection molding, and is continuously continuous in the direction of the arrow YZ orthogonal to the thickness direction while maintaining this wall thickness. The outer portion of the molded wall portion 62 in the YZ direction constitutes the contact portion 58a and is fixed in contact with the inner peripheral surface of the side wall 48. Further, the molded meat portion 62 has a partition surface 62a near the contact portion 58a on the surface facing the fixed mold 14. The molding wall portion 62 is recessed inward from the partition surface 62a in the arrow X2 direction to form a concave space 63 into which the convex portion 38 of the fixed mold 14 is inserted.

When the movable die 16 and the fixed die 14 are clamped, a part of the molded portion 62 contacts the fixed die 14. More specifically, the partition surface 62a contacts the partition surface 36a of the base portion 36 of the fixed mold 14 to form the cavity 20 inside thereof. In other words, the surface of the molded wall portion 62 that faces the fixed mold 14 inside the partition surface 62 a constitutes one surface of the cavity 20. In addition, in the molded wall portion 62 according to the present embodiment, the planned contact portion 62b set at a substantially central portion other than the partition surface 62a comes into contact with the surface of the convex portion 38 of the fixed mold 14 to form the shape of the cavity 20. Maintain each other.

Here, a plurality of flow passages 68 that cause the heat medium to flow are provided inside the molded portion 62 as a temperature adjusting mechanism 66 (including a cooling mechanism). The plurality of flow passages 68 communicate with the flow passages 74 provided in the lightening portion 64, which will be described later, to supply and discharge the heat medium. Examples of the heat medium include temperature-controlled water and oil. Further, the heat medium is collected in each of the flow passages 68, so that the flow passages 68 are brought into a vacuum state (or a state in which the flow-stopped air exists).

The plurality of flow passages 68 extend in the Y-Z direction in the molded meat portion 62, and the temperature of the molded meat portion 62 (particularly near the cavity 20) can be adjusted in a concentrated manner. Further, the plurality of flow passages 68 are grouped for each site of the molded meat portion 62, and the heat medium is supplied and discharged for each site. As a result, the temperature of the molded meat portion 62 can be adjusted by aiming at a portion (for example, the abutting contact portion 62b) to be cooled or heated. Further, the plurality of flow passages 68 may be provided separately for a high temperature flow passage for flowing a high temperature heat medium (heat medium) and a low temperature flow passage for flowing a low temperature heat medium (refrigerant).

On the other hand, as shown in FIG. 1 and FIG. 2, the lightening portion 64 of the insert 18 has a plurality of hollow portions 70 provided between the molded meat portion 62 and the bottom wall 46 and having the meat of the insert 18 itself removed. .. That is, the thinned portion 64 of the insert 18 corresponds to a portion having the hollow portion 70 in the arrow X direction, and conversely, the molded portion 62 corresponds to a portion having no hollow portion 70.

Further, the outer peripheral portion of the lightening portion 64 in the arrow YZ direction is notched inside the outer peripheral portion (contact portion 58a) of the molded thin portion 62 in the arrow YZ direction. That is, the outer peripheral portion of the lightening portion 64 constitutes a non-contact portion 58b that does not contact the side wall 48 when the movable die 16 is accommodated. The notch (non-contact portion 58b) of the lightening portion 64 is provided over the entire circumferential direction of the inner circumferential surface of the side wall 48. Of course, the lightening portion 64 may have a part thereof in contact with the side wall 48.

The plurality of hollow portions 70 are provided in a matrix form in the direction of the arrow YZ, and are not in communication with the cavity 20. In this embodiment, there are a total of nine hollow portions 70 in three rows in the arrow Y direction and three columns in the arrow Z direction. Further, each hollow portion 70 is different in the arrow X direction from the end surface 64a on the side opposite to the molding wall portion 62, depending on the shape of the molding wall portion 62 (so as to secure the wall thickness of the molding wall portion 62). Have depth. More specifically, the hollow portion 70 is formed deep and large in the arrow YZ direction when the thickness of the entire insert 18 is long in the X direction based on the shape of the cavity 20. On the other hand, when the thickness of the entire insert 18 is short in the X direction, the hollow portion 70 is shallow and is formed small in the arrow YZ direction.

The block wall portion 72 of the lightening portion 64 that partitions the plurality of hollow portions 70 is designed to have a shape capable of sufficiently obtaining the strength of the insert 18 in the arrow X direction even when the plurality of hollow portions 70 are provided. .. The block wall portion 72 is formed wide in the arrow YZ direction at a location where the hollow portion 70 is shallow (near the central portion in the arrow YZ direction) and where the hollow portion 70 is deep (the outer peripheral portion in the arrow YZ direction). It is formed narrower in the direction of the arrow Y-Z.

In addition, the block wall 72 is provided with a plurality of flow passages 74 as a temperature adjusting mechanism 66 for flowing the heat medium. The plurality of flow passages 74 extend in the arrow X direction from the end surface 64a of the lightening portion 64, and communicate with appropriate flow passages 68 (for example, in units of groups) of the formed meat portion 62. The flow passages 68 and 74 of the molded meat portion 62 and the block wall portion 72 constitute a circulation circuit that circulates the heat medium, and when the heat medium is withdrawn from the flow passages 68 and 74 (vacuum state, air stagnates). The state), it plays the role of adiabatic function. The plurality of flow passages 74 extend between the gap 60 and the hollow portion 70, respectively. Therefore, each flow passage 74 exerts a heat insulating effect in the surroundings to suppress the temperature change and allow the heat medium to flow.

The flow passage 74 of the block wall portion 72 communicates with the communication passage 76 of the movable die 16 through the hole of the heat insulating plate 54. The communication passage 76 is connected to a pipe 78 that communicates with a heat medium source 80 provided outside the movable die 16. Under the control of the control unit 30, the heat medium source 80 supplies a heat medium (heat medium, refrigerant) having an appropriate temperature to the flow passages 68 and 74, and recovers the heat medium existing in the flow passages 68 and 74. It has a function.

Further, as shown in FIG. 2, the insert 18 (the molded meat portion 62 and the meat removed portion 64) includes, in addition to the hollow portion 70, a plurality of holes 82 smaller than the hollow portion 70. The plurality of holes 82 can further enhance the heat insulating property of the nest 18. The place where the hole 82 is formed, the number of formed holes, the shape, and the like may be arbitrarily designed according to the shape and strength of the nest 18.

Further, as shown in FIG. 1, a taper portion 84 for disposing the driven insert 50 is provided on the side wall 48 of the movable mold 16 and a part of the molding portion 62 of the insert 18. The driven insert 50 has a function of suppressing damage to the insert 18 by displacing with the expansion of the insert 18 and allowing the thermal expansion. Note that, in FIG. 1, the driven insert 50 is illustrated only in a state of being arranged between the movable mold 16 and the insert 18 in the arrow Z direction, but the driven insert 50 includes the movable mold 16 and the insert in the arrow Y direction. It is also preferable that it is arranged between 18.

The taper portion 84 and the driven insert 50 are in contact with each other at their inclined surfaces. Then, the tapered end of the driven insert 50 is connected to the stepped portion of the movable mold 16 via the elastic member 86, while the tapered end of the driven insert 50 is connected to the runner 42 of the fixed mold 14. Is facing. The driven insert 50 is made of a material such as stainless steel having a lower thermal conductivity than the insert 18 and the movable die 16.

Thereby, the gap 60 existing between the side wall 48 and the lightening portion 64 (non-contact portion 58b) and the runner 42 are always closed. That is, when the insert 18 thermally expands in the arrow YZ direction, the driven insert 50 slides along the inclined surface and is pushed out to the runner 42 side. Therefore, while allowing the thermal expansion of the insert 18, the gap 60 and the runner 42 are continuously closed. On the other hand, when the insert 18 is cooled and contracts, the restoring force of the elastic member 86 causes the driven insert 50 to slide along the inclined surface and be pulled back to the elastic member 86 side. Also at this time, the driven insert 50 contacts the movable mold 16 and the insert 18, and continues to close the gap 60 and the runner 42.

The molding die 10 according to the present embodiment is basically configured as described above, and its function and effect will be described below.

In the injection molding device 12 having the molding die 10, the movable mold 16 and the fixed mold 14 are arranged at positions separated from each other before injection molding of a molded product. In this state, the controller 30 heats the insert 18 by supplying the heat medium having a predetermined temperature (above the melting temperature of the molding material) to the flow passage 68 of the insert 18. Due to this heating, the insert 18 thermally expands, but the contact part 58a of the molding portion 62 is in contact with and fixed to the side wall 48 of the movable mold 16, and the driven insert 50 advances to the runner 42 side, so that the stress of thermal expansion is increased. Is suppressed.

After that, the control unit 30 controls the drive of the movable actuator 28 to move the movable mold 16 toward the fixed mold 14 and perform mold clamping. By this mold clamping, the partition surfaces 36a of the fixed mold 14 are brought into contact with the partition surfaces 48a and 62a of the movable mold 16 and the insert 18, and the cavity 20 is formed inside thereof. In this state, the insert 18 receives a pressing force between the fixed die 14 and the movable die 16, but the lightening portion 64 has an appropriate strength to support the formed meat portion 62, so that the cavity 20 of the cavity 20 is The shape can be kept good.

Further, as shown in FIG. 3, in the insert 18, only the contact portion 58 a of the molded meat portion 62 contacts the side wall 48 of the movable die 16, and the non-contact portion 58 b of the lightening portion 64 and the side wall 48 of the movable die 16. A gap 60 is interposed between the heat insulating layer and the heat insulating layer. Further, since the heat insulating plate 54 is provided between the end surface 64a of the lightening portion 64 and the bottom wall 46 of the movable die 16, heat radiation from the nest 18 is suppressed. In addition to this, the hollow portion 70 and the hole 82 also enhance the heat insulating property of the nest 18. Therefore, even if the heating by the temperature adjustment mechanism 66 is suppressed or stopped, the nest 18 can maintain the desired temperature in a good condition.

After the mold is clamped, the injection molding device 12 injects the molten molding material into the cavity 20 from the injection nozzle 34 of the injection mechanism 32 via the spool 40, the runner 42, and the gate 44. After or at the time of this injection, the control unit 30 cools the insert 18 by supplying a coolant having a temperature equal to or lower than a predetermined temperature to the flow passage 68 of the insert 18. As a result, the temperature of the insert 18 drops and contracts.

At this time, the flow passage 74 in the block wall portion 72 is thermally insulated by the hollow portion 70 and the hole 82 provided around the flow passage 74. Therefore, the coolant is supplied with the temperature rise suppressed even in the flow passage 68 of the molded portion 62, and the insert 18 can be effectively cooled.

When the temperature of the molded portion 62 drops, the injected molding material solidifies and a molded product is molded. Then, when the temperature of the insert 18 reaches a predetermined temperature, the refrigerant is recovered from the flow passages 68 and 74, and further, the movable mold 16 is moved in the direction of the arrow X2 to open the mold. After that, when the molded product is taken out by the ejector mechanism and the injection molding is performed again, the same operation as described above is repeated.

As described above, according to the molding die 10 according to the present embodiment, the movable mold 16 and the nest 18 can be properly positioned by the contact portion 58a of the nest 18, and the cavity 20 can be accurately formed. it can. Further, by forming the gap 60 between the movable die 16 and the movable die 16 in the expanded state by the non-contact portion 58b of the nest 18, conduction of heat between the nest 18 and the movable die 16 is achieved by the heat insulating effect of the gap 60. Can be effectively suppressed. Furthermore, since the insert 18 includes the hollow portion 70, the hollow portion 70 also has a heat insulating effect. Therefore, the temperature change of the insert 18 can be suppressed, and the energy for adjusting the temperature of the insert 18 can be saved during injection molding. As a result, it is possible to reduce the manufacturing cost when manufacturing the molded product.

In this case, since the molding die 10 includes the plurality of hollow portions 70, the heat insulating effect of the insert 18 can be further enhanced. Further, in the molding die 10, since the contact portion 58a is arranged near the opening of the accommodation space 16a, the shape of the cavity 20 can be maintained with higher accuracy. Further, since the gap 60 is formed over the entire circumference in the circumferential direction of the inner peripheral surface of the movable die 16 (side wall 48), the heat insulating effect is increased, and the energy required for adjusting the temperature of the insert 18 can be significantly reduced. .. Furthermore, in the molding die 10, the heat insulating plate 54 makes it possible to further suppress the conduction of heat to the movable die 16.

The nest 18 can easily change the temperature of the nest 18 by the flow passages 68 and 74. The heat passage is removed from the flow passages 68 and 74, so that the heat insulating effect can be obtained similarly to the hollow portion 70. Can be demonstrated. In particular, the molding wall portion 62 of the insert 18 is capable of imparting an appropriate temperature to the molding material injected into the cavity 20 because the temperature is smoothly adjusted by the heat medium having a small temperature change. The temperature adjusting mechanism 66 makes it possible to easily cool the insert 18 by causing a refrigerant to flow in the flow passage 68 as a heat medium, and to favorably solidify the molding material.

The present invention is not limited to the above-mentioned embodiment, and various modifications can be made according to the gist of the invention. For example, the nest 18 may be provided not only in the movable die 16 but also in the fixed die 14.

Claims (11)

A first mold (16) and a second mold (14) which are clamped,
A nest (18) arranged in the first mold (16),
The nest (18) is
It is possible to form a cavity (20) between the second mold (14) and a molding material.
Further, an abutting portion (58a) that abuts the first mold (16) in an expanded state due to temperature rise,
A non-contact part (58b) which forms a gap (60) between the first mold (16) and the first mold (16) to be in non-contact in the expanded state;
The extending from the cavity end face on the opposite side (20) is formed (64a) to said cavity (20) around, and the hollow portion of Hiren with the cavity (20) and (70), have a,
The first mold (16) has a housing space (16a) for housing the nest (18),
The gap (60) is formed on the inner side of the accommodation space (16a) with respect to the contact portion (58a) and over the entire circumference in the circumferential direction of the inner peripheral surface forming the accommodation space (16a)
The gap (60) is partially closed on the end surface of the first mold (16) opposite to the end surface in contact with the insert (18), and the insert (18) is a separate member and displaceable. Is provided with a driven nest (50),
The molding die (10), wherein the driven insert (50) allows thermal expansion and contraction of the insert (18) while continuing to close the gap (60 ). The molding die (10) according to claim 1,
Further comprising a fixing member (52) for connecting and holding the first mold (16) and the insert (18),
The molding die (10), wherein the fixing member (52) is provided closer to a side surface abutting the nest (18) than a center of the accommodation space (16a ). The molding die (10) according to claim 1,
The nest (18) includes flow passages (68, 74) through which a heat medium for adjusting the temperature of the nest (18) itself is circulated,
The mold (10) for molding, wherein the flow passages (68, 74) are capable of removing a heat medium as needed . The molding die (10) according to claim 3 ,
Molding characterized in that the flow passage (68) is provided at least in a molding wall portion (62) forming the cavity (20) on the second mold (14) side of the hollow portion (70). Mold (10). The molding die (10) according to claim 4 ,
The flow passage (74) is further formed so as to extend between the gap (60) and the hollow portion (70), and communicates with the flow passage (68) provided in the molded wall portion (62). mold, characterized in that it is (10). A first mold (16) and a second mold (14) which are clamped,
A nest (18) arranged in the first mold (16),
The nest (18) is
It is possible to form a cavity (20) between the second mold (14) and a molding material.
Further, an abutting portion (58a) that abuts the first mold (16) in an expanded state due to temperature rise,
A non-contact part (58b) which forms a gap (60) between the first mold (16) and the first mold (16) to be in non-contact in the expanded state;
A hollow portion (70) extending from the end surface (64a) on the opposite side where the cavity (20) is formed to the vicinity of the cavity (20) and not communicating with the cavity (20),
The nest (18) includes flow passages (68, 74) through which a heat medium for adjusting the temperature of the nest (18) itself is circulated,
The flow passages (68, 74) are provided at least in the molded meat portion (62) forming the cavity (20) on the second mold (14) side of the hollow portion (70),
Molding which is formed so as to extend between the gap (60) and the hollow portion (70) and communicates with the flow passage (68) provided in the molding wall portion (62). Mold (10). The molding die (10) according to claim 6,
The mold (10) for molding, wherein the flow passages (68, 74) are capable of removing a heat medium as needed . The molding die (10) according to claim 1 or 6 ,
The molding die (10), wherein the nest (18) includes a plurality of hollow portions (70) with a wall portion interposed therebetween . The molding die (10) according to claim 1 or 6 ,
A molding die (10), characterized in that a heat insulating member (54) is provided between the nest (18) and the first die (16 ). The molding die (10) according to claim 3 or 6 ,
The heat medium includes a refrigerant,
The molding die (10), wherein the flow passages (68, 74) are configured as a cooling mechanism (66) for cooling the insert (18) during injection molding . The molding die (10) according to claim 3 or 6,
The flow passages (68, 74) are grouped for each part of the nest (18) so that the heat medium can flow through each part.
A molding die (10) characterized by the above.

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