JP2010167657A - Mold and tape cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently temperature-control a mold, and to improve the responsiveness of temperature control. <P>SOLUTION: The injection molding mold 1 has a template body 4 in which an arrangement space 41 is formed along the mold opening/closing direction Z, a fixed cavity insert 5 which forms a cavity C, a passage forming plate 6, a gate cavity insert 7, and a runner plate 8. The fixed cavity insert 5, the passage forming plate 6, the gate cavity insert 7, and the runner plate 8 are arranged in the arrangement space 41 in a state that they are laminated in the mold opening/closing direction Z. The temperature of the fixed cavity insert 5 is controlled at a prescribed temperature. In the passage forming plate 6 adjacent in the mold opening/closing direction Z to the fixed cavity insert 5, a plurality of through holes 63 penetrating the passage forming plate 6 in the mold opening/closing direction Z are formed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mold including a plurality of mold members stacked at least including a nest that forms a cavity, and a mold plate body in which a space for arranging the mold members is formed, and the mold The present invention relates to a tape cartridge provided with a tape reel formed using a tape.

  2. Description of the Related Art Conventionally, as a mold, a mold in which a plurality of mold members including at least a nest that forms a cavity is stacked and disposed in an arrangement space in a mold body is known (for example, Patent Document 1). .

  In the metal mold | die which concerns on patent document 1, the arrangement | positioning space which has a step part is penetrated and formed by the type | mold opening-and-closing direction in the template main body of a stationary side template. In this arrangement space, a space that has a smaller sectional area on the lower side (movable mold side) than the stepped portion is provided with a nest that forms a cavity, and the upper portion of the arranged space above the stepped portion. A mold member (hereinafter also referred to as a runner mold member) in which a runner is formed is disposed in a space having a large cross-sectional area on the (fixed side mounting plate side). Thus, in the arrangement space, the insert and the runner type member are arranged in a stacked state.

In addition, the mold nesting may be temperature controlled to a predetermined temperature in the molding cycle. For example, in the mold according to Patent Document 2, a refrigerant flow path is formed in the nest, and the temperature is controlled by the refrigerant flowing through the refrigerant flow path. Specifically, the temperature of the nest is controlled so as to be high in the resin injection process and low in the cooling process.
JP 2001-232664 A JP 2003-334852 A

  However, in a mold having a plurality of mold members including a nest, even if the nest is heated and cooled in order to control the temperature of the nest to a predetermined temperature, the nest and the mold member adjacent to the nest Since there is heat exchange between them, in addition to the nesting, the temperature of the adjacent mold member and the like is substantially controlled. As a result, the temperature of the nest cannot be efficiently controlled, and further, the responsiveness of the temperature control is deteriorated.

  This invention is made | formed in view of this point, The place made into the objective is to improve the responsiveness of temperature control while temperature-controlling a metal mold | die efficiently.

  According to a first aspect of the present invention, there is provided a mold plate main body in which an arrangement space is formed in a mold opening / closing direction, and a plurality of mold members including at least a nest forming a cavity, and the plurality of mold members are stacked in the mold opening / closing direction. The molds arranged in the arrangement space in a state of being applied are targets. The insert is temperature-controlled at a predetermined temperature, and the mold member adjacent to the insert in the mold opening / closing direction has a plurality of through holes penetrating the mold member in the mold opening / closing direction. It shall be formed.

  In the case of the above configuration, a plurality of through holes are formed in the mold member adjacent to the insert in the mold opening / closing direction, so that the heat capacity of the mold member is small. Therefore, even if heat is conducted from the temperature-controlled insert to the adjacent mold member, the heat capacity of the mold member is small, so that a large amount of heat can be prevented from moving.

  In addition, since the through hole is formed so as to penetrate in the mold opening / closing direction, the contact area between the mold member and the insert is narrow. Therefore, the thermal resistance between the nest and the adjacent mold member is increased, and it is difficult for heat to be conducted from the nest to the mold member. In other words, in a configuration in which a plurality of mold members are laminated, heat conduction from the nest to other laminated mold members can be suppressed by placing a mold member having a large thermal resistance adjacent to the nest.

  Further, by forming the through hole in the mold opening / closing direction, it is possible to suppress a decrease in rigidity in the mold opening / closing direction even when the through hole is formed in the mold member. As a result, the mold clamping force that acts in the mold opening / closing direction on the insert during molding can be received by the mold member adjacent to the insert.

  According to a second aspect of the present invention, in the first aspect, the insert and the adjacent mold member are formed with a refrigerant flow path for circulating a refrigerant for adjusting the temperature of the insert, and the adjacent mold member The refrigerant flow path formed in is composed of a pipe member inserted into the through hole, and the pipe member has a lower thermal conductivity than the mold member.

  In the case of the above configuration, the coolant channel can be provided in the mold member adjacent to the insert in the mold opening / closing direction using the through hole. At this time, instead of using the through hole as a refrigerant flow path as it is, a pipe member having a lower thermal conductivity than that of the mold member is inserted into the through hole to constitute the refrigerant flow path. It is possible to efficiently control the temperature of the nest while suppressing heat conduction between the coolant flowing in the flow path and the mold member.

  According to a third aspect, in the second aspect, the pipe member has a multilayer structure including at least a resin layer.

  Since the resin generally has a low thermal conductivity, the pipe member has a multi-layer structure including at least a resin layer, thereby further improving the heat conduction between the refrigerant flowing inside the refrigerant flow path and the mold member. In this way, the temperature of the nest can be controlled more efficiently.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, refrigerants having different temperatures are circulated through the refrigerant flow path through which the refrigerant is circulated in the nest.

  In the case of the above configuration, since the temperature of the refrigerant flowing through the refrigerant flow path changes during one molding cycle, the temperature of the nesting also changes accordingly. And in the above configuration, by reducing the heat capacity of the member through which the refrigerant flows, the temperature of the nest can be controlled efficiently and with high responsiveness, so the time required for the molding cycle can be shortened, The place can also perform precise nesting temperature control according to the temperature change of the fish.

  The fifth invention is intended for a tape cartridge, and includes a tape reel formed using the mold according to any one of the first to fourth inventions.

  In the case of the above-described configuration, a tape reel having good transferability and appearance can be obtained by molding the tape reel with a mold capable of performing temperature control with high responsiveness. As a result, the shape accuracy of the tape reel can be improved, so that the positional accuracy of the tape reel in the tape cartridge and, in turn, the positional accuracy of the tape drawn from the tape reel can be improved.

  According to the first invention, the mold member adjacent to the insert in the mold opening / closing direction is formed with a plurality of through holes penetrating the mold member in the mold opening / closing direction. Since the heat capacity can be reduced and the contact area between the mold member and the insert can be reduced, the heat conduction from the insert to the mold member can be suppressed, and the heat conduction to other stacked mold members can be reduced. Can be suppressed. As a result, the temperature of the nesting can be controlled efficiently and with high responsiveness. Further, by forming the through hole in the adjacent mold member in the mold opening / closing direction, it is possible to suppress a decrease in rigidity of the mold member in the mold opening / closing direction, and as a result, the mold member can be nested. It can receive the clamping force that acts.

  According to the second invention, a part of the refrigerant flow path for circulating the refrigerant to the nest is formed by inserting a pipe member having a lower thermal conductivity than the mold member into the through-hole, so that the inside of the refrigerant flow path It is possible to efficiently control the temperature of the nest while suppressing heat conduction between the refrigerant flowing through the mold and the mold member.

  According to the third invention, the tube member has a multilayer structure including at least a resin layer, thereby further suppressing heat conduction between the refrigerant flowing inside the refrigerant flow path and the mold member, and further nesting. The temperature can be controlled efficiently.

  According to the fourth aspect of the present invention, the refrigerant having different temperatures is circulated through the refrigerant flow path through which the refrigerant is circulated in one nesting cycle, thereby efficiently nesting with high responsiveness to the temperature change of the refrigerant. Temperature control can be performed.

  According to the fifth aspect, by mounting the tape reel formed using any one of the first to fourth molds on the tape cartridge, the positional accuracy of the tape reel and the tape drawn out from the tape reel Position accuracy can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<< Embodiment of the Invention >>
-Overall configuration-
FIG. 1 is a partial longitudinal sectional view of an injection mold according to an exemplary embodiment.

  The injection mold 1 according to the embodiment is a three-plate mold and includes a fixed mold 2 and a movable mold 3. The injection mold 1 constitutes an injection molding machine together with an injection device, a mold clamping device, and the like (not shown). The fixed side mold 2 is fixedly attached in the injection molding machine, while the movable side mold 3 is arranged to face the fixed side mold 2 and is in a mold opening / closing direction Z (vertical direction in FIG. 1). ) Is movable. This injection mold 1 corresponds to a mold.

  The fixed mold 2 includes a fixed mounting plate 21 mounted on a fixed plate (not shown) of an injection molding machine, a runner stripper plate 22 for separating resin waste material (so-called runner) from a molded product, and a cavity C. And a fixed-side mold plate 23 that is a female mold that defines a part of the mold.

  The fixed side mounting plate 21, the runner stripper plate 22, and the fixed side mold plate 23 are stacked in this order and are configured to be movable relative to the fixed side mounting plate 21. That is, the runner stripper plate 22 is configured to be relatively movable with respect to the fixed side mounting plate 21, and is in contact with the fixed side mounting plate 21 and in a state of being separated from the fixed side mounting plate 21. Move between. The fixed-side template 23 is configured to be movable relative to the fixed-side mounting plate 21, and is in a state where it is in contact with the runner stripper plate 22 and a state where it is separated from the runner stripper plate 22. Move between. The detailed configuration of the fixed side template 23 will be described later.

  The fixed-side mounting plate 21 is provided with a sprue bush (not shown), and a locating ring 21a is provided on the upper surface of the fixed-side mounting plate 21 so as to surround the upper opening. An injection cylinder nozzle of an injection device is attached to the locate ring 21a. A sprue (not shown) is formed in the sprue bush, and the tip of the sprue extends to the upper surface of the fixed-side template 23.

  The movable mold 3 includes a movable mold 31 that is a male mold that defines a part of the cavity C, and a receiving plate 32 that abuts the movable mold 31 and reinforces the movable mold 31. A movable side mounting plate 35 attached to a movable plate (not shown) of the injection molding machine, a spacer plate 33 for forming a predetermined space between the receiving plate 32 and the movable side mounting plate 35, And an ejector plate 34 disposed in a space formed by the spacer plate 33. The movable mold 3 is configured to be movable relative to the fixed mold 2 and is in contact with the fixed mold 2 and separated from the fixed mold 2. Move between. The movable side mold plate 31, the receiving plate 32, the spacer plate 33 and the movable side mounting plate 35 are laminated in this order, and when the movable side mold 3 moves, the relative positional relationship with each other is determined. Move as one without changing. The movable side mold plate 31 abuts on the fixed side mold plate 23 to partition the cavity C therebetween.

  The ejector plate 34 has ejector pins 34a and 34a, and is configured to be driven by an ejector device (not shown) of an injection molding machine. Specifically, the ejector pins 34a and 34a are in a state in which the tip does not protrude into the cavity C in the mold closing process and the injection process described later, whereas the tip enters the cavity C in the extraction process. Thus, the molded product is released from the movable side mold plate 31.

-Fixed side template-
Here, the fixed-side template 23 will be described in more detail.

  2A is a front view, FIG. 2B is a bottom view, and FIG. 3C is a rear view, FIG. 3 is a cross-sectional view of the fixed-side template 23, and FIG. FIG. 5 is a bottom view of the forming plate 6, and FIG. 5 is a plan view of the fixed side insert 5 described later.

  As shown in FIG. 3, the fixed-side template 23 has a template body 4, a fixed-side insert 5, a flow path forming plate 6, a gate insert 7, and a runner plate 8. As shown in FIG. 2, the fixed-side template 23 is provided with two sets of the fixed-side insert 5, the flow path forming plate 6, the gate insert 7, and the runner plate 8 with respect to one template body 4. Yes. The fixed side insert 5, the flow path forming plate 6, the gate insert 7 and the runner plate 8 constitute a mold member.

  The template body 4 is a rectangular plate-shaped member, and an arrangement space 41 for arranging the fixed side insert 5, the flow path forming plate 6, the gate insert 7 and the runner plate 8 is in the center. Are formed through the mold opening / closing direction Z. The template body 4 is formed with first and second step portions 42a and 42b in order from the runner stripper plate 22 side (upper side) to the movable side template 31 side (lower side) in the arrangement space 41. Yes. The first and second step portions 42a and 42b are flat surfaces orthogonal to the mold opening / closing direction Z. Also, a first inner peripheral surface 43a that connects the upper surface (base end surface) 40a of the template body 4 and the first step portion 42a, a second inner peripheral surface 43b that connects the first step portion 42a and the second step portion 42b, A third inner peripheral surface 43c that connects the second step portion 42b and the lower surface (tip surface) 40b of the template body 4 is formed substantially parallel to the mold opening / closing direction Z. In the present embodiment, the template body 4 is made of metal and is made of, for example, carbon steel.

  The runner plate 8 is a rectangular plate-shaped member. A runner 81 is formed on the upper surface of the runner plate 8. The runner 81 extends in a direction perpendicular to the paper surface in FIG. 3, and communicates with the sprue of the sprue bush of the fixed side mounting plate 21. Further, the runner plate 8 is formed with a first sprue 82 penetrating in the plate thickness direction. The upper end of the first sprue 82 communicates with the runner 81.

  The gate insert 7 is a cylindrical member, and is attached so as to extend downward substantially at the center of the lower surface of the runner plate 8. A cavity surface 71 that defines a part of the cavity C is formed on the lower surface (that is, the front end surface) of the gate insert 7. The gate insert 7 is formed with a second sprue 72 penetrating along its axis. The upper end of the second sprue 72 communicates with the lower end of the first sprue 82 of the runner plate 8, while the lower end of the second sprue 72 is open to the cavity surface 71. The opening at the lower end of the second spru 72 constitutes the gate 73. Further, an enlarged-diameter portion 74 whose outer diameter is enlarged like a bowl is formed on the peripheral edge of the upper side (runner plate 8 side) of the gate insert 7 so as to be fitted to an enlarged-diameter portion 61a described later of the flow path forming plate 6. .

  Thus, the first sprue 82 and the second sprue 72 constitute one sprue that allows the runner 81 and the cavity C to communicate with each other. That is, the molten resin as a molding material injected from the injection device flows into the fixed mold 2 from the sprue bush of the fixed side mounting plate 21, and the sprue of the sprue bush, the runner 81 of the runner plate 8, the first It flows from the gate 73 into the cavity C through the sprue 82 and the second sprue 72 of the gate insert 7.

  The flow path forming plate 6 is a substantially disk-shaped member as shown in FIG. In detail, the flow path forming plate 6 is formed with a circular hole 61 having a circular cross section for disposing the gate insert 7 along the axis A of the flow path forming plate 6 at the center thereof. Yes. Further, an enlarged diameter part 61a having an enlarged inner diameter is formed on the peripheral edge of the flow path forming plate 6 on the upper side (runner plate 8 side) of the arrangement hole 61 (see FIG. 3). The inner diameter of the arrangement hole 61 substantially matches the outer diameter of the gate insert 7, and the inner diameter of the enlarged portion 61 a substantially matches the outer diameter of the enlarged portion 74 of the gate insert 7. That is, the gate insert 7 is fitted into the arrangement hole 61. At this time, the upper surface of the gate insert 7 and the upper surface of the flow path forming plate 6 are flush with each other. Further, a plurality of through holes 63, 63,... Are formed in the flow path forming plate 6 in the thickness direction (coincident with the mold opening / closing direction Z). And although mentioned later in detail, the 4th pipes 27d and 27d are each fitted by two through-holes 63 and 63 of several through-holes 63, 63, .... These fourth pipes 27d and 27d constitute a part of a high-temperature refrigerant flow path 24 described later.

  As shown in FIG. 5, the fixed side insert 5 is a substantially disc-shaped member, and includes a disc-shaped main body portion 50 and an enlarged-diameter portion 51 whose outer diameter is enlarged like a bowl at the upper end of the main body portion 50. And have. The outer diameter of the enlarged diameter portion 51 is substantially the same as the outer diameter of the flow path forming plate 6. In the center of the fixed side insert 5, an arrangement hole 52 having a circular cross section for disposing the gate insert 7 is formed through the axis B of the fixed side insert 5. The inner diameter of the arrangement hole 52 is substantially the same as the outer diameter of the gate insert 7, and the arrangement hole 61 of the flow path forming plate 6 and the inner peripheral surface are continuous with each other. That is, the gate insert 7 is fitted into the arrangement hole 52. At this time, the lower surface of the gate insert 7 does not reach the lower surface (tip surface) of the fixed insert 5. In addition, a cavity surface 53 that is recessed from the lower surface is formed on the lower surface of the fixed-side insert 5. The cavity surface 53 is a plane parallel to the lower surface recessed from the lower surface of the fixed side insert 5, a circumferential surface connecting the plane and the lower surface, a lower end portion of the installation hole 52, It is comprised by the part which the gate insert 7 does not overlap among inner peripheral surfaces. The cavity surface 53 and the cavity surface 71 at the tip of the gate insert 7 constitute a cavity surface of the fixed-side template 23. In the present embodiment, the fixed side insert 5 is made of metal and is made of, for example, stainless steel.

  The fixed side nest 5, the flow path forming plate 6, the gate nest 7, and the runner plate 8 configured as described above are configured such that the gate nest 7 is attached to the runner plate 8 and the flow path forming plate 6 is fixed on the fixed side. The insert 5 is attached to the runner plate 8 with the insert 5 attached. In this way, the fixed side insert 5, the flow path forming plate 6, the gate insert 7, and the runner plate 8 are integrally laminated and arranged in the arrangement space 41 of the template body 4. Each member is attached by, for example, bolt fastening. The stacking direction of the fixed side insert 5, the flow path forming plate 6 and the runner plate 8 and the stacking direction of the gate insert 7 and the runner plate 8 are the through direction of the arrangement space 41 of the template body 4 (that is, the mold opening and closing). Direction Z).

  More specifically, the third inner peripheral surface 43 c of the template body 4 is formed on a circumferential surface, and the inner diameter thereof substantially coincides with the outer diameter of the main body portion 50 of the fixed side insert 5. Further, the second inner peripheral surface 43 b of the template body 4 is formed on the circumferential surface, and the inner diameter thereof substantially coincides with the outer diameter of the enlarged diameter portion 51 of the fixed side insert 5. The fixed side insert 5 is disposed on the second step portion 42 b of the template body 4. That is, the main body portion 50 of the fixed side insert 5 is fitted to the third inner peripheral surface 43c of the template body 4, and the enlarged diameter portion 51 of the fixed side insert 5 is fitted to the second inner peripheral surface 43b and the second inner peripheral surface 43b. Engage with the second step 42b.

  Since the outer diameter of the flow path forming plate 6 substantially coincides with the outer diameter of the enlarged diameter portion 51 of the fixed side insert 5, the outer diameter of the second inner peripheral surface 43 b of the template body 4 is the same as that of the flow path forming plate 6. The outer diameter is also approximately the same. Therefore, the flow path forming plate 6 is disposed on the fixed side insert 5 in a state of being fitted to the second inner peripheral surface 43 b of the template body 4. At this time, the upper surface of the flow path forming plate 6 is flush with the first step portion 42a.

  The first inner peripheral surface 43 a has a rectangular shape similar to that of the runner plate 8. The runner plate 8 is fitted on the first inner peripheral surface 43a of the template body 4 and is disposed on the first step portion 42a. In a state where the runner plate 8 is disposed on the first step portion 42 a, the upper surface of the runner plate 8 is flush with the upper surface 40 a of the template body 4.

  Thus, the fixed side insert 5, the flow path forming plate 6, the gate insert 7, and the runner plate 8 are arranged in the arrangement space 41 in a state of being stacked in the mold opening / closing direction Z, and the outer periphery is arranged on the mold plate. Covered by the body 4.

-Moveable side template-
Next, the movable side template 31 will be described.

  As shown in FIG. 1, the movable side template 31 has a template body 91, a first movable side nest 92, a flow path forming plate 93, and a second movable side nest 94.

  The template body 91 is a rectangular plate-shaped member, and an arrangement space 91a for arranging the first movable side nest 92, the flow path forming plate 93 and the second movable side nest 94 is provided. It penetrates in the thickness direction (clamping direction) in the center.

  Both the first movable side insert 92 and the flow path forming plate 93 are substantially disk-shaped members having a through hole formed in the center. The first movable side nest 92 and the flow path forming plate 93 are arranged in the arrangement space 91a in a state where the flow path forming plate 93 is laminated below the first movable side nest 92. On the upper surface of the first movable-side insert 92, a cavity surface 92a that defines a part of the cavity C is formed.

  The second movable side nest 94 is a cylindrical member, and is disposed in a through hole formed through the center of the first movable side nest 92 and the flow path forming plate 93. The tip of the second movable side nest 94 protrudes above the cavity surface 92a of the first movable side nest 92, and a part of the cavity C is formed on the side peripheral surface of the upper part of the second movable side nest 94. A cavity surface 94a for forming a partition is formed.

  The cavity surface 92a of the first movable side nest 92 and the cavity surface 94a of the second movable side nest 94 constitute a cavity surface of the movable side mold plate 31. Then, the movable side mold plate 31 abuts on the fixed side mold plate 23, so that the cavity C is defined by the cavity surface of the movable side mold plate 31 and the cavity surface of the fixed side mold plate 23. At this time, the front end surface of the second movable side nest 94 is in contact with the front end surface of the gate nest 5 of the fixed side template 23.

  The tip portions of the ejector pins 34a and 34a are inserted into the first movable side nest 92 and the second movable side nest 94, respectively, so that they can protrude from the tip surfaces of the cavity surface 92a and the second movable side nest 94. It is configured.

-Refrigerant flow path-
A refrigerant flow path is formed in the injection mold 1 configured as described above. Specifically, the fixed-side template 23 has a high-temperature refrigerant flow path 24 through which the high-temperature refrigerant from the high-temperature refrigerant pipe 11 circulates, and a low-temperature refrigerant through which the low-temperature refrigerant from the low-temperature refrigerant pipe 12 flows. A flow path 25 is formed. This high-temperature refrigerant flow path 24 corresponds to a refrigerant flow path. The movable side mold plate 31 and the receiving plate 32 are formed with a movable side refrigerant passage 95 through which a low-temperature refrigerant similar to the low-temperature refrigerant pipe 12 flows. In the present embodiment, water is used as the refrigerant flowing through these refrigerant flow paths. However, the refrigerant may be a refrigerant other than water.

<High-temperature refrigerant flow path>
The high-temperature refrigerant flow path 24 extends from the mold body 4 through the runner plate 8 and the flow path forming plate 6 to the stationary side nest 5, and again through the flow path forming plate 6 and the runner plate 8. It is formed so as to return to the plate body 4. Specifically, as shown in FIG. 3, the high-temperature refrigerant flow path 24 includes a high-temperature inflow side flow path 24 a and a high-temperature outflow side flow path 24 b formed on the runner plate 8 and the flow path formation plate 6 from the template body 4. And the high temperature nesting side flow path 24c formed in the fixed side nesting 5.

  The high temperature inflow side flow path 24a includes perforations 26a to 26e, 63 formed in the template body 4, the runner plate 8, and the flow path forming plate 6, and pipes 27a to 27d fitted in the perforations 26a to 26e, 63. It consists of

  Specifically, the template body 4 has a first perforation 26a formed inward in the horizontal direction from the side surface 40c, and a second perforation 26b formed downward from the first step portion 42a. The front end of the first perforation 26a and the front end of the second perforation 26b communicate with each other. A first pipe 27a is driven into the first perforation 26a from the side surface 40c side, while a second pipe 27b is driven into the second perforation 26b from the first step portion 42a side. One end of the second pipe 27b protrudes from the first step portion 42a. The runner plate 8 has a third perforation 26c formed inward in the horizontal direction from the side surface 80c, and a fourth perforation 26d and a fifth perforation 26e formed upward from two locations on the lower surface 80b. The fourth perforation 26d is formed at a position where the runner plate 8 communicates with the second perforation 26b of the template body 4 when the runner plate 8 is attached to the template body 4. Communicate. The fifth perforation 26e is formed at a position on the inner side in the horizontal direction of the runner plate 8 relative to the fourth perforation 26d, and the tip thereof communicates with the tip of the third perforation 26c. A third pipe 27c is driven into the third perforation 26c from the side surface 80c side. Furthermore, in the flow path forming plate 6, as described above, the fourth pipes 27d, 27d are driven into the two through holes 63, 63 of the plurality of through holes 63, 63,. The fourth pipe 27d constitutes a part of the high temperature inflow channel 24a. The other fourth pipe 27d constitutes a part of the high temperature outflow side passage 24b. The fourth pipe 27 d has one end protruding from the upper surface 60 a of the flow path forming plate 6, and the other end flush with the lower surface 60 b of the flow path forming plate 6. When the flow path forming plate 6 is attached to the runner plate 8, one end portion of the fourth pipe 27d is fitted into the fifth perforation 26e of the runner plate 8. Further, when the runner plate 8 is attached to the template body 4, the second pipe 27 b of the template body 4 is fitted into the fourth perforation 26 d of the runner plate 8. Thus, the first to fifth perforations 26a to 26e, the through hole 63, and the first to fourth pipes 27a to 27d constitute the high temperature inflow side flow path 24a. The fourth pipe 27d constitutes a pipe member.

  These first to fourth pipes 27 a to 27 d are configured to have a lower thermal conductivity than the template body 4, the flow path forming plate 6, and the runner plate 8. Specifically, the first to fourth pipes 27a to 27d according to the present embodiment have a double tube structure in which a stainless steel inner tube is fitted to a resin outer tube. In addition, the double pipe structure which formed the resin film in the outer side of the stainless steel inner pipe | tube may be sufficient.

  Similarly to the high temperature inflow side flow path 24a, the high temperature outflow side flow path 24b is also formed in the first to fifth perforations 26a to 26e and the flow path forming plate 6 formed in the template body 4 and the runner plate 8. It is comprised by the through-hole 63 and the 1st-4th pipes 27a-27d fitted by each. However, the high temperature outflow side flow path 24b is formed at a position shifted in the horizontal direction (that is, the direction parallel to the upper surface 40a of the template body 4) with respect to the high temperature inflow side flow path 24a. Further, the third perforation 26c of the high temperature outflow side flow path 24b extends inward of the runner plate 8 from the third perforation 26c of the high temperature inflow side flow path 34a, and the fifth perforation 26e of the high temperature outflow side flow path 24b. The through hole 63 is located more inside the runner plate 8 and the flow path forming plate 6 (that is, closer to the axial center) than the fifth perforation 26e and the through hole 63 of the high temperature inflow side flow path 34a.

  The high temperature nesting side flow path 24 c is formed by a flow path groove 56 formed on the bottom surface of the annular depression 58 on the upper surface of the fixed side nesting 5 and a lid member 57 that closes the flow path groove 56. As shown in FIG. 5, the flow channel groove 56 has a large-diameter outer groove 56 a formed in a C shape around the axis B of the fixed side insert 5 and a C shape around the axis B. The small-diameter inner groove 56b is connected to each other at one end via a connecting groove 56c. The lid member 57 is an annular plate member that fits into the annular depression 58 and covers the flow channel groove 56. In the lid member 57, communication holes 57a and 57b are formed penetratingly at positions corresponding to the other end of the outer groove 56a and the other end of the inner groove 56b. The communication hole 57a and the communication hole 57b are located at positions shifted in the circumferential direction of the stationary side insert 5, and the opening of the communication hole 57a is located radially outside of the communication hole 57b. . Thus, the fixed side nest 5 is formed with a high temperature nest side flow path 24c having one end opened at the communication hole 57a and the other end opened at the communication hole 57b.

  And by attaching the fixed side nest 5 and the flow path forming plate 6 to each other, the downstream end of the high temperature inflow side flow path 24a and the communication hole 57a of the high temperature nest side flow path 24c communicate with each other, and the high temperature outflow side flow path The upstream end of 24b communicates with the communication hole 57b of the high temperature nesting side flow path 24c.

  In addition, on the lower surface 60 b of the flow path forming plate 6, when joined to the upper surface of the stationary side insert 5, an annular inner ring groove 65 located inside the annular recess 58 and an outer side of the annular recess 58 are provided. An annular outer ring groove 66 is formed. In these inner and outer ring grooves 65 and 66, O-rings (not shown) are arranged. This O-ring seals the leakage of the refrigerant flowing through the high-temperature refrigerant flow path 24 at the joint surface (that is, the upper surface and the lower surface) between the fixed side insert 5 and the flow path forming plate 6.

  Two high temperature refrigerant pipes 11 are connected to the side surface 40c of the template body 4 so as to communicate with the upstream end of the high temperature inflow side flow path 24a and the downstream end of the high temperature outflow side flow path 24b, respectively.

<Low-temperature refrigerant flow path>
On the other hand, the low-temperature refrigerant flow path 25 includes a low-temperature inflow side flow path 25 a and a low-temperature outflow side flow path 25 b (shown only in FIG. 2) formed in the template body 4 and a low temperature formed in the runner plate 8. The runner side flow path 25c and the low temperature gate side flow path 25d formed in the gate insert 7 are included. In FIG. 3, the low temperature outflow side flow path 25b overlaps the back side in the direction perpendicular to the paper surface with respect to the low temperature inflow side flow path 25a.

  The low-temperature inflow side flow path 25a and the low-temperature outflow side flow path 25b extend inward from the side surface 40d of the template body 4 facing the side surface 40c, and then bend upward. The first step portion 42a is formed so as to open. The low temperature refrigerant pipe 12 is connected to the inflow end of the low temperature inflow side flow channel 25a and the outflow end of the low temperature outflow side flow channel 25b, respectively.

  The low temperature runner side flow path 25 c extends in parallel with the upper and lower surfaces of the runner plate 8 while branching inside the runner plate 8. The inflow end and the outflow end of the low temperature runner side flow path 25c are open to the lower surface of the runner plate 8 at a position communicating with the low temperature inflow side flow path 25a and the low temperature outflow side flow path 25b. Further, the low temperature runner side flow path 25 c has branch flow paths 25 e and 25 e to the low temperature gate side flow path 25 d, and one ends of the branch flow paths 25 e and 25 e are opened on the lower surface of the runner plate 8.

  The low-temperature gate-side flow path 25d is formed inside the gate insert 7. In FIG. 3, only one low-temperature gate-side flow path 25 d is shown, but a plurality of low-temperature gate-side flow paths 25 d are provided so as to surround the second sprue 72. Further, branch channels 25e and 25e of the low temperature runner side channel 25c are also provided according to the number of the low temperature gate side channels 25d.

  When the gate insert 7, the runner plate 8, and the template body 4 are attached to each other, the low temperature inflow side flow path 25a, the low temperature outflow side flow path 25b, the low temperature runner side flow path 25c, and the low temperature gate side flow path 25d Communicate with each other.

<Moving side refrigerant flow path>
In addition, a coolant channel is also formed in the movable mold 3.

  As shown in FIG. 1, the movable-side refrigerant channel 95 formed in the movable-side mold 3 includes the first movable-side refrigerant channels 95 a and 95 a formed in the receiving plate 32 and the flow of the movable-side template 31. The second movable side refrigerant flow paths 95b and 95b formed in the path forming plate 93 and the third movable side refrigerant flow path 95c formed in the first movable side nest 92 of the movable side template 31 are included.

  The third movable-side refrigerant flow path 95c has the same configuration as the high-temperature nesting-side flow path 24c formed in the fixed-side nesting 5. That is, the third movable-side refrigerant flow path 95c has a shape in which two C-shaped flow paths having different diameters are connected to each other at the lower surface of the first movable-side insert 92. Thus, one third movable-side refrigerant channel 95c is formed with one communication hole as an inlet end and the other communication hole as an outlet end.

  Two second movable-side refrigerant channels 95b are formed through the channel-forming plate 93 and communicate with the inlet end and the outlet end of the third movable-side refrigerant channel 95c, respectively.

  Two first movable-side refrigerant channels 95 a and 95 a are formed in the receiving plate 32. Specifically, the two first movable-side refrigerant channels 95a and 95a extend inward from the side surface of the receiving plate 32 and communicate with the second movable-side refrigerant channels 95b and 95b, respectively. .

  Thus, the first movable side refrigerant channel 95a and the second movable side refrigerant channel 95b are passed through the third movable side refrigerant channel 95c of the first movable side nest 92 to pass through the second movable side refrigerant channel 95b and the second movable channel refrigerant channel 95b. One movable-side refrigerant flow path 95 is formed through the one movable-side refrigerant flow path 95a.

-Molding process-
A molding method using the injection mold 1 configured as described above will be described with reference to FIG. Specifically, heat cycle molding using the injection mold 1 will be described. The injection mold 1 is not limited to heat cycle molding, and can be employed in various molding methods.

  FIG. 6 shows each step in heat cycle molding, the refrigerant temperature of the refrigerant flowing through the high-temperature refrigerant flow path 24 and the temperature of the fixed nesting 5, the refrigerant temperature of the refrigerant flowing through the low-temperature refrigerant flow path 25, and the template body It is a time chart figure of temperature of 4 grade | etc.,.

  The heat cycle molding according to the present embodiment includes a mold closing process, an injection process, a pressure holding process, a cooling process, a mold opening process, and a removal process in one cycle.

  In the mold closing step, the movable mold 3 is lifted along the mold opening / closing direction Z from the state separated from the fixed mold 2 and is brought into contact with the fixed mold 2. By doing so, a cavity C is defined between the fixed mold plate 23 and the movable mold plate 31.

  Subsequently, in an injection process, molten resin is injected from the injection device into the injection mold 1. The injected molten resin flows from the sprue bush of the fixed side mounting plate 21 into the fixed side mold 2, and the sprue of the sprue bush, the runner 81 of the runner plate 8, the first sprue 82 and the second of the gate insert 7. The gas flows from the gate 73 into the cavity C through the sprue 72. Thus, the molten resin is filled into the cavity C.

  Thereafter, in the pressure holding step, a predetermined pressure is applied to the filled resin and maintained in that state.

  Subsequently, the filling resin is cooled in the cooling step. The filled resin is cooled and solidified to form a molded product.

  Thereafter, the movable mold 3 is separated from the fixed mold 2 in the mold opening process. By doing so, the movable side mold plate 31 is separated from the fixed side mold plate 23, and accordingly, the molded product is released from the fixed side mold plate 23 and moves together with the movable side mold plate 31. Thereafter, the ejector pins 34 a and 34 a are protruded to release the molded product from the movable side mold plate 31. When the movable mold 3 is separated from the fixed mold 2, the fixed mold 23 is also lowered and separated from the runner stripper plate 22. In this way, the resin waste material is separated from the molded product. The separated resin waste material remains on the runner stripper plate 22 and the fixed side mounting plate 21 side. Thereafter, the runnast stripper plate 22 is lowered and separated from the fixed side mounting plate 21, thereby fixing the fixed side mounting plate 21 and Separated from the runner stripper plate 22.

  In such heat cycle molding, the low-temperature refrigerant is always circulated through the low-temperature refrigerant flow path 25 (see FIG. 6D). Similarly, the low-temperature refrigerant is circulated through the movable-side refrigerant channel 95 in the same manner. On the other hand, the high-temperature refrigerant flow path 24 circulates the high-temperature refrigerant from the mold opening process to the pressure holding process, and the low-temperature refrigerant similar to the low-temperature refrigerant flow path 25 from the pressure holding process to the next mold opening process. Is distributed (see FIG. 6B). By doing so, the mold body 4, the runner plate 8 and the gate insert 7 through which the molten resin circulates, and the movable side mold plate 31 and the receiving plate 32 are set to a predetermined first temperature T1 in the entire process of heat cycle molding. On the other hand (see (E) of FIG. 6), the fixed-side insert 5 that defines the cavity C can be kept at a temperature higher than the first temperature T1 at least during the injection process in which the molten resin flows into the cavity C. The first temperature T1 can be set to two temperatures T2 and at least during the cooling step of cooling the molten resin. The switching timing between the high-temperature refrigerant and the low-temperature refrigerant in the high-temperature refrigerant flow path 24 is not limited to the above-described timing, and the temperature of the fixed side insert 5 is at least high during the injection process in which the molten resin is injected into the cavity C. As long as the second temperature T2 is set, and the first temperature T1 is low during at least the cooling step of cooling the molten resin, any timing can be set.

  Here, the high-temperature refrigerant flow path 24 is formed of resin and stainless steel in the first to fifth perforations 26a to 26e and the through hole 63 formed in the template body 4, the runner plate 8, and the flow path forming plate 6. Since the first to fourth pipes 27a to 27d having a heavy pipe structure are formed by driving, the heat conduction from the refrigerant to the template body 4, the runner plate 8, and the flow path forming plate 6 causes the first to first pipes. The portion where the four pipes 27a to 27d are driven is suppressed. Thus, the refrigerant flowing through the high-temperature refrigerant flow path 24 is sent to the fixed side nest 5 without much heat escaping to other members. Further, even if the high-temperature refrigerant flow path 24 is formed in the template body 4, the runner plate 8, and the flow path forming plate 6, since only heat conduction to these members is suppressed, It will be substantially heated and cooled. As a result, it is possible to efficiently control the temperature of the fixed side insert 5 and to quickly control the temperature of the fixed side insert 5 to improve the temperature control response.

  Further, since the plurality of through holes 63, 63,... Are formed in the flow path forming plate 6 adjacent to the fixed side nest 5 as described above, conduction is performed from the fixed side nest 5 to the flow path forming plate 6. The amount of heat is suppressed. That is, the upper surface of the fixed side insert 5 and the lower surface of the flow path forming plate 6 are in contact with each other, and heat conduction occurs between the fixed side insert 5 and the flow path forming plate 6. However, since the flow path forming plate 6 has a small heat capacity due to the formation of the through holes 63, 63,..., Even if heat is conducted from the fixed side insert 5 to the flow path forming plate 6, the amount of heat is reduced.

  Further, since the through holes 63, 63,... Penetrate through the flow path forming plate 6 in the stacking direction with the fixed side insert 5, the through holes 63, 63,. Thus, the contact area between the flow path forming plate 6 and the fixed side insert 5 can be reduced. As a result, the thermal resistance between the fixed side insert 5 and the flow path forming plate 6 increases, and the amount of heat conducted from the fixed side insert 5 to the flow path forming plate 6 is reduced.

  By the way, a clamping force in the mold opening / closing direction Z acts on the fixed side insert 5, and a clamping force acts on the flow path forming plate 6 via the fixed side insert 5. Further, in the injection process, an injection pressure of resin acts on the fixed side insert 5 and this injection pressure also acts on the flow path forming plate 6 in the stacking direction (that is, the mold opening / closing direction Z). Here, though the through holes 63, 63,... Are formed through the flow path forming plate 6, the through direction thereof coincides with the mold opening / closing direction Z. The decrease in rigidity is suppressed. As a result, the mold clamping force and injection pressure from the fixed side insert 5 can be received by the flow path forming plate 6.

-Molded product-
The molded product molded by the injection mold 1 according to this embodiment will be described below.

  FIG. 7 is an exploded perspective view of the magnetic tape cartridge 100 including the tape reel formed by the injection mold 1.

  The magnetic tape cartridge 100 is, for example, a one-reel (single reel) type cartridge type information recording conforming to the LTO (Linear Tape Open) standard used as a storage device for backing up recorded data recorded in an electronic computer. It is a medium. The magnetic tape cartridge 100 includes a casing 102, a tape reel 103, a magnetic tape (not shown), a lock release tool 104, a reel presser 105, a spring 155, a cartridge memory 125, and a write protect plug 126. This magnetic tape cartridge 100 constitutes a tape cartridge.

  The casing 102 is formed in a flat rectangular parallelepiped, and has a divided structure of a synthetic resin lower case 121 and an upper case 122. The lower case 121 and the upper case 122 are each formed in a shallow dish shape having a square shape in plan view. On the inner surface of the top plate of the upper case 122, a guide protrusion (not shown in FIG. 7) having a cross-shaped cross section is formed so as to protrude downward at the approximate center. The lower case 121 and the upper case 122 are fastened with screws. A tape reel 103 is accommodated in the casing 102. A gear opening 121 a for exposing a driven gear (not shown) of the tape reel 103 to the outside is formed in the bottom plate of the lower case 121 at substantially the center thereof.

  Further, the casing 102 is formed with a tape outlet 102a for pulling out the magnetic tape wound around the tape reel 103 at one of the four corners. The tape outlet 102 a is closed by a thin plate-like lid 123 so as to be opened and closed. The lid 123 is biased in a direction to close the tape outlet 102a via a spring 123a.

  Furthermore, a memory accommodating portion 102b partitioned by arc-shaped ribs is formed at another portion of the four corners of the casing 102. A cartridge memory 125 is accommodated in the memory accommodating portion 102b. The cartridge memory 125 stores manufacturing information, usage history information, magnetic tape partition information, and the like of the magnetic tape cartridge 100.

  Furthermore, a plug accommodating portion 102c partitioned by flat ribs is formed at another portion of the four corners of the casing 102. A write protect plug 126 is accommodated in the plug accommodating portion 102c. The write protect plug 126 is for preventing erroneous erasure of data recorded on the magnetic tape cartridge 100. The write protect plug 126 is accommodated in the plug accommodating portion 102c so as to be slidable between the data erasure allowable position and the data erasure prohibited position.

  The tape reel 103 includes a cylindrical hub 131, an upper flange 132 provided in a bowl shape at the upper end of the hub 131, a lower flange 133 provided in a bowl shape at the lower end of the hub 131, and the lower flange 133. And a metal suction plate 135 attached to the. The hub 131, the upper flange 132, and the lower flange 133 are made of synthetic resin. More specifically, the hub 131 and the lower flange 133 are integrally formed. The upper flange 132 is ultrasonically welded to the upper end of the hub 131 integrally formed with the lower flange 133.

  The hub 131 is formed in a bottomed cylindrical shape whose upper end side (that is, upper flange side) is open and whose lower end side (that is, lower flange side) is closed. A magnetic tape is wound around the outer peripheral surface of the hub 131.

  On the upper surface (inner surface) of the bottom wall of the hub 131, three arc-shaped ribs 131b (only one is shown in FIG. 7) project from the hub 131 in a state of being arranged on the same circumference at intervals. . Locked gears 131a are formed on the upper surfaces of the ribs 131b. On the bottom wall of the hub 131, an opening into which a later-described claw portion 143 of the unlocking tool 104 is fitted on a portion between the adjacent ribs 131 b, that is, a portion outside the rib 131 b in the radial direction. (Not shown) is formed through.

  Further, a suction plate 135 is attached to the center of the bottom wall lower surface (outer surface) of the hub 131. Further, a driven gear (not shown) is formed in an annular shape on the outer peripheral edge of the bottom surface of the bottom wall of the hub 131. The opening is opened in a portion of the bottom wall where the driven gear is formed. That is, the nail | claw part 143 of the unlocking tool 104 protrudes from the opening to the lower surface of the bottom wall of the hub 131 by being mixed with the teeth of the driven gear.

  In the tape reel 103, the driven gear and the suction plate 135 are exposed to the outside of the casing 102 from the gear opening 121 a of the lower case 121. When the magnetic tape cartridge 100 is loaded in the tape drive, the suction plate 135 is magnetically attracted to the drive shaft of the tape drive motor, and the drive gear of the drive shaft is engaged with the driven gear.

  The reel presser 105 has a flat bottomed cylindrical shape that opens upward, and its outer diameter is set smaller than the inner diameter of the hub 131 of the tape reel 103. The reel presser 105 is disposed in the hub 131. In addition, four ribs 151, 151,... Having L-shaped cross sections project from the center of the upper surface (inner surface) of the bottom wall of the reel retainer 105, and these four ribs 151, 151,. The slide groove 152 is formed. The slide groove 152 has the same shape as a guide protrusion (not shown) of the upper case 122, and is slidable in the vertical direction with respect to the guide protrusion and engaged with the guide protrusion in a relatively non-rotatable manner. Further, a lock gear (not shown) is formed on the bottom wall lower surface (outer surface) of the reel presser 105. This lock gear is formed so as to mesh with the locked gear 131 a of the hub 131 of the tape reel 103.

  The spring 155 is a coil spring, and its inner diameter is set to a value that surrounds the guide protrusion of the upper case 122 and the ribs 151, 151,. That is, the spring 155 is disposed between the upper case 122 and the reel presser 105 so as to surround the guide protrusion and the ribs 151, 151,. The spring 155 contracts and deforms when the lower case 121 and the upper case 122 are joined, and biases the reel presser 105 downward (to the tape reel 103 side).

  The reel presser 105 urged downward in this manner presses the tape reel 103 downward while the lock gear is engaged with the locked gear 131a of the tape reel 103. At this time, the reel presser 105 is in a state in which the ribs 151, 151,... Engage with the guide protrusions of the upper case 122 and cannot rotate with respect to the upper case 122. The tape reel 103 meshed with the lock gear 105 is also in a non-rotatable state. The magnetic tape cartridge 100 is in this state when not driven.

  The unlocking device 104 includes a main body 141 and three arm portions 142, 142, 142 extending radially from the main body 141. A claw portion 143 that is bent and extends downward is formed at the tip of each arm portion 142. In a state where the lock gear of the reel presser 105 is engaged with the locked gear 131a of the hub 131, a gap is formed between the reel presser 105 and the bottom wall of the hub 131. The hub 131 is disposed in the gap between the bottom wall of the hub 131 and the reel presser 105. At this time, the arm portions 142, 142, 142 of the unlocking tool 104 extend between the ribs 131 b on the upper surface of the bottom wall of the hub 131, and the claw portion 143 is fitted in the opening of the bottom wall of the hub 131. . The lock release tool 104 is in this state when the magnetic tape cartridge 100 is not driven, and does not affect the meshing state of the lock gear of the reel presser 105 and the locked gear 131a of the hub 131. On the other hand, when the magnetic tape cartridge 100 is loaded in the tape drive, that is, when it is driven, the lock release tool 104 is pushed upward. The unlocking tool 104 pushed upward further pushes up the reel presser 105 against the urging force of the spring 155. When the reel presser 105 is pushed up, the engagement between the lock gear of the reel presser 105 and the locked gear 131a of the hub 131 is released, and the rotation of the tape reel 103 is allowed.

  The fixed side mold plate 23 and the movable side mold plate 31 in the injection mold 1 are configured to mold the upper flange 132. That is, the cavity C formed by the fixed side mold plate 23 and the movable side mold plate 31 has the same shape as the upper flange 132. More specifically, the surface of the upper flange 132 that faces the lower flange 133 is formed by the cavity surface of the fixed-side template 23.

-Effect of the embodiment-
Therefore, according to the present embodiment, the high-temperature refrigerant flow path 24 is formed on a member other than the fixed side insert 5 (specifically, the template body 4, the runner plate 8, and the flow path forming plate 6). In the flow path, that is, in the high temperature inflow side flow path 24a and the high temperature outflow side flow path 24b, the first to fourth pipes 27a to 27d having a double pipe structure of resin and stainless steel are driven to form a refrigerant flow path. This prevents the heat of the refrigerant flowing through the high-temperature refrigerant flow path 24 from being conducted to the template body 4, the runner plate 8, and the flow path forming plate 6 before the refrigerant reaches the fixed side insert 5. Thus, the temperature of the fixed side insert 5 can be controlled efficiently. Moreover, since only the fixed side nest 5 can be substantially heated and cooled in this way, the temperature of the fixed side nest 5 can be quickly controlled, and the responsiveness of temperature control can be improved.

  Further, by forming through holes 63, 63,... In the flow path forming plate 6 in the laminating direction of the flow path forming plate 6 and the fixed side insert 5, the through holes 63, 63,. It is possible to reduce the contact area between the flow path forming plate 6 and the fixed side insert 5 by opening the lower surface of the plate 6. As a result, the thermal resistance between the fixed side insert 5 and the flow path forming plate 6 is increased, and the amount of heat conducted from the fixed side insert 5 to the flow path forming plate 6 can be reduced. Also by this, the temperature of the fixed side insert 5 can be efficiently controlled, and further the responsiveness of the temperature control can be improved. Further, by opening the through holes 63, 63,... On the upper surface of the flow path forming plate 6 and narrowing the contact area between the flow path forming plate 6 and the runner plate 8, the flow path forming plate 6 and the runner are reduced. It is possible to increase the heat resistance between the plate 8 and the heat conducted from the fixed side insert 5 to the flow path forming plate 6 to be further prevented from being conducted to the runner plate 8.

  As described above, the mold member disposed in the template body 4 is not constituted only by the fixed side insert 5 forming the cavity C and the runner plate 8 on which the runner 81 is formed, but by the fixed side insert 5 and the runner. The flow path forming plate 6 is interposed between the plate 8 and the flow path forming plate 6 is formed with through holes 63, 63,... A member having a large thermal resistance can be interposed between them, and heat exchange between the stationary insert 5 and the runner plate 8 can be suppressed. As a result, the temperature of the fixed side insert 5 can be controlled efficiently, and further the responsiveness of the temperature control can be improved.

  A heat insulating material is preferably provided between the outer peripheral surface of the fixed side insert 5 and the inner peripheral surface of the template body 4. By doing so, the fixed-side nest 5 can increase not only the members adjacent in the stacking direction but also the members adjacent to the outer peripheral side thereof, and the fixed-side nest 5 is adjacent to the fixed-side nest 5. The heat conduction to the member can be suppressed as much as possible.

  Further, by forming a plurality of through holes 63, 63,... In the flow path forming plate 6 adjacent to the fixed side insert 5, it is possible to suppress the amount of heat conducted from the fixed side insert 5 to the flow path forming plate 6. it can. That is, the upper surface of the fixed side insert 5 and the lower surface of the flow path forming plate 6 are in contact with each other, and heat conduction occurs between the fixed side insert 5 and the flow path forming plate 6 even if the thermal resistance is large. However, since the flow path forming plate 6 has a small heat capacity due to the formation of the through holes 63, 63,..., Even if heat is conducted from the fixed side insert 5 to the flow path forming plate 6, the amount of heat is reduced. As a result, the temperature of the fixed side insert 5 can be controlled efficiently, and further the responsiveness of the temperature control can be improved.

  Moreover, even if it is the structure which forms the through-holes 63, 63, ... in the flow-path formation plate 6 by making the penetration direction of the through-holes 63, 63, ... correspond with the type | mold opening / closing direction Z, the flow-path formation plate 6 Of the mold in the mold opening / closing direction Z can be suppressed, and the mold clamping force and the injection pressure acting on the flow path forming plate 6 can be firmly received by the flow path forming plate 6 via the fixed side insert 5. .

  Thus, since temperature control of the fixed side nest 5 can be performed efficiently and with high responsiveness, the temperature of the fixed side nest 5 can be accurately controlled along with a desired temperature change. In particular, in a configuration in which the temperature of the refrigerant flowing through the high-temperature refrigerant flow path 24 changes during a single molding cycle, such as heat cycle molding, not only can the time of the entire molding cycle be shortened, It is possible to quickly and accurately control the temperature to a desired temperature to improve the transferability of the cavity shape to the molded product, and to improve the appearance of the molded product.

  For example, when the upper flange 132 of the tape reel 103 is formed as in this embodiment, the shape accuracy of the tape reel 103 can be improved. As a result, the tape in the magnetic tape cartridge 100 including the tape reel 103 can be improved. The positional accuracy of the reel 103 and, in turn, the positional accuracy of the recording tape drawn from the tape reel 103 can be improved.

<< Other Embodiments >>
The present invention may have the following configurations for the embodiments.

  For example, the configuration of the high-temperature refrigerant flow path 24 is not limited to the above configuration. That is, a configuration in which the high-temperature refrigerant flow path 24 is formed in the fixed side nest 5 and the flow path forming plate 6, a configuration in which the high temperature refrigerant flow path 24 is formed in the fixed side nest 5, the flow path forming plate 6 and the runner plate 8, The structure etc. which are formed in the fixed side insert 5, the runner plate 8, and the template main body 4 without providing the formation plate 6 may be sufficient.

  Further, the first to fourth pipes 27a to 27d are not limited to the double pipe structure. For example, a single-layer tube made of stainless steel may be used. However, the first to fourth pipes 27a to 27d preferably have lower thermal conductivity than the mold member into which they are fitted.

  Furthermore, in the said embodiment, although the flow-path formation plate 6 is provided and the through-holes 63, 63, ... is formed in this flow-path formation plate 6, it is not restricted to this. For example, when the runner plate 8 is provided adjacent to the stationary insert 5 without providing the flow path forming plate 6, a plurality of through holes similar to the through holes 63 may be formed in the runner plate 8. Good.

  Furthermore, in the said embodiment, although the fixed side metal mold | die 2 was demonstrated, you may employ | adopt the said structure for the movable side metal mold | die 3. FIG.

  Further, in the above configuration, the fixed side mold plate is disposed above and the movable side mold plate is disposed below. However, the fixed side mold plate is disposed below and the movable side mold plate is disposed above. May be. Furthermore, although the opening and closing directions of the fixed side mold plate and the movable side template are oriented in the vertical direction, the opening and closing direction may be oriented in the horizontal direction. In such a case, the fixed-side template and the movable-side template may be arranged on either the left or right side.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention includes a mold plate body in which an installation space is formed along the mold opening / closing direction, and a plurality of mold members including at least a nest that forms a cavity, and the plurality of mold members includes It is useful for a tape cartridge provided with a mold arranged in the arrangement space in a state of being laminated in the mold opening / closing direction and a tape reel formed using the mold.

It is a longitudinal cross-sectional view in the II line | wire of FIG. 2 (B) of the metal mold | die for injection molding which concerns on embodiment of this invention. It is a figure which shows a stationary side template, (A) is a front view, (B) is a bottom view, (C) shows a rear view. It is sectional drawing of the stationary-side template in the III-III line of FIG. It is a bottom view of a flow path formation plate. It is a top view of a fixed side nest. It is a time chart of heat cycle molding, (A) is a process, (B) is a refrigerant which circulates through a high-temperature refrigerant channel, (C) is a fixed side nesting temperature, (D) is a low-temperature refrigerant channel. (E) indicates the temperature of the template body and the like. It is a disassembled perspective view which shows a magnetic tape cartridge.

1 Injection mold (mold)
24 High-temperature refrigerant flow path (refrigerant flow path)
27d Fourth pipe (tube member)
4 Template body 41 Space 5 Fixed side nesting (nesting)
6 Channel formation plate (mold member)
63 Through-hole 7 Gate insert (mold member)
8 Runner plate (mold member)
100 Magnetic tape cartridge (tape cartridge)
103 Tape reel C Cavity Z Mold opening / closing direction

Claims (5)

A mold plate body in which an installation space is formed along the mold opening and closing direction, and a plurality of mold members including at least a nest that forms a cavity, and the plurality of mold members are stacked in the mold opening and closing direction. A mold arranged in the arrangement space,
The nesting is temperature controlled to a predetermined temperature,
The mold member adjacent to the nesting in the mold opening / closing direction is formed with a plurality of through holes penetrating the mold member in the mold opening / closing direction. The mold according to claim 1, wherein
The nest and the adjacent mold member are formed with a refrigerant flow path for circulating a refrigerant for adjusting the temperature of the nest.
The refrigerant flow path formed in the adjacent mold member is composed of a pipe member inserted into the through hole,
The tube member is a mold having a lower thermal conductivity than the mold member. The mold according to claim 2,
The pipe member is a mold having a multilayer structure including at least a resin layer. The mold according to any one of claims 1 to 3,
A mold in which refrigerants having different temperatures circulate in the refrigerant flow path through which the refrigerant flows in the nest.   A tape cartridge comprising a tape reel formed using the mold according to any one of claims 1 to 4.

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